WO1999022554A2

WO1999022554A2 - Housing for accommodating electronic assembly groups

Info

Publication number: WO1999022554A2
Application number: PCT/EP1998/006669
Authority: WO
Inventors: Philon Rothschild
Original assignee: Philon Rothschild
Priority date: 1997-10-25
Filing date: 1998-10-21
Publication date: 1999-05-06
Also published as: EP1048192A2; WO1999022554A3; AU1485599A

Abstract

The invention relates to a housing (1) for accommodating electronic assembly groups and motorized driven units in which one or more hard disk(s) (20) or others is or are respectively supported by an assembly group(s) comprising a drive motor. Together with suited fastening means, a damper-carrier surface (50), a damper-fastening surface (55), at least one respective carrier surface-vibration damper (51) and a fastening surface-vibration damper are provided in order to support said hard disk (20). The damper-carrier surface (50) and the damper-fastening surface (55) are assigned to a side of the hard disk (20) and to two opposite lying sides of a suited supporting surface (3). A carrier surface-vibration damper (51) is arranged between the damper-carrier surface (50) and the supporting surface (3) and is situated with at least one respective contact surface on the damper-carrier surface (50) and the supporting surface (3) in at least a partially two-dimensional manner. In addition, a fastening surface-vibration damper (74) is arranged between the fastening-support surface (55) and the supporting surface (3) and is situated with at least one respective contact surface on the damper-fastening surface (55) and the supporting surface (3) in at least a partially two-dimensional manner.

Description

Housing for receiving electronic assemblies

The invention relates to housings for receiving electronic assemblies and constantly motor-driven assemblies, in which one or more hard disk (s) or other assembly (s) with a drive motor is or are held. A computer is usually used to operate a personal computer, for example, in which a hard disk, an arithmetic unit, a floppy disk and other units are accommodated in a cuboid housing. In such housings, fans are usually installed, which maintain an air flow in the housing during computer operation for cooling the electronic and mechanical assemblies contained in the housing.

Computer users often perceive the noise development of such a computer as unpleasant. As far as the noise emitted by the fans is concerned, they are in a medium frequency range and are therefore subjectively less disruptive than the high-frequency sound emitted by the computer and the alternating noises (beats) created by the mixture. The high-frequency sound, the frequency of which can extend up to 9 kHz or more, emanates mainly from the drive motor of the hard disk, which is driven at a very high speed by the auxiliary motor. Although the high-frequency sound radiated from the housing and through airflow openings is only of relatively low amplitude, it is annoying because of its constant presence, and all the more so when several computers with appropriate sound radiation are used in a room (e.g. open-plan office). In this room there is a constant high-pitched whistle or whistle, which continually affects the health and manpower of those working in the room. Due to the strong competition, PCs and workstations have fallen sharply in price and are now mass-produced. A 36-month guarantee is now common at least for the major providers worldwide. Due to the rapid technical progress, the purchase price of a computer falls within a very short time, well before the guarantee period expires. This means that manufacturers and suppliers still bear the warranty risk, although the goods are now largely worthless. The main causes of a warranty claim are usually the components in the computer, which contain mechanically moving or driven parts. The failure of the mass storage device, the hard disk, leads to the greatest individual damage for both the user and the manufacturer or supplier. Modern hard drives are sensitive to impact and partly - due to high recording power - also to overheating. Even small impacts can lead to a disk / read head collision. Such impacts on a commonly installed computer caused by the user are not detectable for the manufacturer or supplier and automatically lead to a warranty obligation in the event of such defects. The state of the art already offers an abundance of individual or even combined solutions for soundproofing computer housings, cooling vibrating assemblies and shock absorption for sensitive assemblies. The following publications are assumed to be known as prior art:

DE-GM 297 04 870, DE-OS 38 23 656, DE-GM 296 02 346, DE-OS 43 14 199 US-PS 5 192 143, US-PS 5 510 954, US-PS 5 596483, US-PS 5,287,244 US Pat. No. 5,214,549, US Pat. No. 5,668,697, US Pat. No. 5,654,875. DE-GM 297 04 870 provides extensive structure-borne noise isolation by suspending a hard disk in O-rings made of rubber-elastic material and lining the housing - Inside made with cork / rubber mats. The disadvantage here is that, depending on the type of hard drive, the settings of the suspensions have to be made. It is also questionable whether slipping of the assembly during transport can really be prevented in all cases. This suspension contradicts the express manufacturer's instructions for the stable mounting of hard drives. A hard disk held in a 5 '' mounting frame sits directly behind the front of the computer in standard housings. This means that a front flap must always be closed in order to fully reduce the noise. A hard drive held in a 5 Vi inch mounting frame can only be cooled with a fan from below or with a very small fan from the side. In many cases, ventilation from below is not sufficient. Hard drive manufacturers typically dictate that airflow must be maintained over both the top and bottom for safe cooling. Since no further passive cooling is provided for the hard disk, a fan failure on many hard disks can lead to overheating. This is particularly fatal if a computer works unattended and a system message about a fan failure is not immediately reacted to. Even if a fan failure detection automatically shuts down the system, this is synonymous with a system fault that must be remedied immediately for further operation. Furthermore, the use of cork / rubber does not meet the UL regulations for fire protection in electrical devices.

DE-OS 43 14 199 describes a device for dissipating heat from vibration-damped assemblies, which are located in a closed housing. It is questionable whether the cooling method described there is sufficient to adequately cool hard drives with a power loss of up to 20W through only conductive heat dissipation. Computers are specified with an operating temperature of 35 ° C for medium latitudes and with 40 ° C for the warmer regions. However, the hard drives available on the mass market are only offered with a maximum permissible surface temperature of 55 - 60 ° C. However, the surface temperatures specified for maximum service life are usually 10 - 15 ° C below the maximum permissible temperature. This means that very effective cooling must be provided for a long service life. The method described here is anyway unusable due to the assembly costs for the mass market. Furthermore, hard disks must not be changed mechanically due to the manufacturer's warranty. However, effective heat transfer using braided copper wire can only be achieved by soldering or welding to the hard disk.

Shock absorbers for hard drives are described in US Pat. No. 5,192,143. It is not clear whether these shock absorbers also effectively reduce noise. Furthermore, it is doubted whether these shock absorbers are sufficient to adequately protect a hard disk from a 30g impact on the casing during operation. 30g bumps occur when a computer is started with a vacuum cleaner. Usual 3 '' inch hard drives are designed for a maximum of 10g shock load during operation. This publication does not reveal anything about cooling the hard disk.

The best known prior art to date is described in U.S. Patents 5,510,945 and 5,596,483. However, it is disadvantageous that the hard disk is hermetically encapsulated and thus offers no possibility of active or passive direct ventilation cooling. Here the cooling of the hard disk is only possible via heat dissipation. The required air outlet on the computer deck does not correspond to any housing standard. The guided air flow is too dependent on the modules used and is already warmed up when it reaches the heat sink described there. There is no redundant cooling. Two or even more very slowly rotating fans and an air flow in the power supply caused by convection are all that is sufficient for a computer with low-performance components. Encapsulating the hard disk restricts cooling to such an extent that this method cannot be used for high-performance hard disks (see c 't edition 19/1998, from page 136 on page 142). The cooler bag described there, filled with liquid, is pressed onto the upper and lower side of the hard disk using a wide, flat metal clip in order to achieve good heat transfer. The underside of a hard drive, no matter what type, usually contains a circuit board with sharp-edged SMD components and connector pins. It cannot be ruled out here that the effectiveness of this cooling is jeopardized by tearing the cooler bag during manufacture or during transport or operation. Furthermore, the assembly and disassembly of a hard disk appears complex here.

From the current state of knowledge of technology, there is no concept recognizable that satisfies the following criteria at the same time: 1) sufficient noise reduction for subjective perception, 2) for the narrow temperature spectrum of a hard disk, even with the most powerful hard disks, sufficient cooling for a long service life, 3 ) for the shock sensitivity of the hard disk, adequate protection against the possible impacts in a typical working environment, 4) a solution for the above-described necessities with the least use of material and installation costs. Above all, there is no uniform concept recognizable from the current state of knowledge, which enables a modular step-by-step expansion for the large number of hard drives available on the market, each with different noise and temperature developments, for both noise reduction and cooling. The hard disk is considered to be the main cause of the subjectively unpleasant noise development. In the current state of hard disk technology, this is due to the fact that a hard disk has four independent noise sources. The bearings of the drive and the medium are responsible for the high frequencies and the alternating magnetic fields generated in the drive. The low and also high-energy vibrations are generated on the one hand by the manufacturing-related unbalance tolerances of the medium and on the other hand by the acceleration and braking forces of the read / write head. Due to the globally regulated limits for HF radiation from electronic devices, the use of metal housings for computers remains essential for effective EMC. With a conventional metal-on-metal installation of the hard disks in the housing, this inevitably leads to an increased radiation of noise over the metal surfaces. In addition, depending on the design of the housing, especially the high-energy, low vibrations cause uncontrolled excitation of the metal sheets in the most varied of harmonic resonances of the fundamental frequencies. The invention is therefore based on the object of providing measures on a computer of the type explained above which suppress the subjectively unpleasant sound radiation as much as possible. At the same time, the hard drive should be protected against usual bumps on the case. Low-noise and fail-safe cooling measures are also intended to prevent thermal self-destruction of the hard disk. Furthermore, the measures to be taken should be designed with a uniform concept that can be expanded in stages so that only the appropriate measures need to be implemented for the different performance classes. In addition, the housing configuration should enable them to be mass-produced in a cost-effective manner, both with regard to the material rate and the required assembly steps. In connection with the addressed modular concept, an optimal cost reduction for a range of different computer models from one production is to be achieved.

The solution to this task explained below and the special exemplary embodiments were developed constructively and thus geometrically for a tower computer housing. However, it goes without saying that use in desktop housings or other alternative housings is also possible in principle, in that the geometry and arrangement of the functional elements used are correspondingly adapted in terms of design. The basic principle which is used according to the invention for reducing the sound emission is the decoupling and vibration damping of the structure-borne and airborne sound of all the permanently motor-driven assemblies which are built into the computer and are relevant for the development of noise from the common chassis. Combined heat dissipation and active and / or passive ventilation cooling is used for low-noise cooling of the hard disk. Passive cooling, in which forced ventilation of the motor-driven assembly by means of a fan is unnecessary, leads to a further reduction in noise emissions. If a motor-driven assembly is arranged in a ventilated shaft in such a way that the inside dimension of the shaft is dimensioned in relation to the wavelength of the sound pressure to be expected in such a way that the sound pressure is already dampened in the adjacent air medium when it is deployed, this leads to a further reduction in the Noise emission.

According to the invention, the object is achieved in that the housing for accommodating electronic assemblies and motor-driven units, in which one or more hard disk (s) or other assembly (s), each having a drive motor, is / are held, that for the mounting of the hard disk, in addition to suitable fastening means, a damper support surface, a damper mounting surface, em support surface vibration damper, em mounting surface vibration damper and a suitable mounting surface are provided that the damper support surface and the damper mounting surface on one side of the hard disk and are assigned two opposite sides of the mounting surface, that at least em carrier surface vibration damper is arranged between the damper carrier surface and the mounting surface and with at least one contact surface on the damper carrier surface and the Hal tion surface is at least partially flat and that at least em mounting surface vibration damper is arranged between the damper mounting surface and the mounting surface and is at least partially flat with at least one contact surface on the damper mounting surface.

The hard disk is thus arranged, for example, in a holder which has a rigid damper support surface on the front side of the holder. This is attached, for example, with rivets to the fastening edges provided on the holder and thus forms a mechanical unit with the holder. This unit is preferably mounted on the front panel of the chassis in the configuration described below. However, any other suitable holder in the housing is also conceivable. The front plate is preferably as rigid as possible or additionally stabilized, for example by means of a stiffening plate provided in the mounting area. The fastening elements engaging in the damper support surface, such as fastening screws or the like. are supported by a stiff damper mounting surface on the outside of the front panel. Between the damper support surface of the bracket and the inside of the front panel is a support surface vibration damper made of a semi-elastic material and between the damper mounting surface and the outside of the front panel is for example made of the same material em mounting surface vibration damper. The semi-elastic material is designed so that it is considerably more elastic than the front panel but still has sufficient load capacity for the holder with the hard disk then held. Furthermore, the fastening edges of the holder serve as an end stop for the fastening elements engaging the damper support surface. An adjustment of the fastening elements is therefore not necessary. At the same time, the whole Layer structure, consisting of damper support surface, stiffened front panel, damper mounting surface and the two vibration dampers with the fastening elements coordinated in such a way that the two vibration dampers are under slight prestress when the fastening elements engaging in the damper carrier surface are at the stop. Due to the preloaded dampers, the fastening elements are then conditionally considered to be firmly connected to the damper fastening surface. Thus, within the scope of the vibrational forces that arise here, there is always a permanent, relatively rigid connection between the damper support surface and damper mounting surface. The rigid design of the two structurally designed surfaces has the effect that the vibrations generated by the hard disk are essentially only introduced vertically into the dampers. Furthermore, the fastenings are always insulated from the base or holding layer between the two dampers and can be moved vertically to the damper plane or at a distance.

The above-mentioned stiffening of the front plate by means of a stiffening plate in the holding area of the holder can alternatively also be achieved, in particular in mass production, in that the holding surface or another suitable holder in the housing is given the required rigidity by braced deep embossing in the sheet metal. The carrier and damper fastening surfaces explained above can alternatively also take any other geometrical shape, which fulfill the task of indirect flat contact with the damper surfaces. The surface contact is not necessarily plane-parallel. The dampers are also not necessarily to be designed with plane-parallel or regular surfaces.

The symmetrical design of the damper layers explained above is a low-pass filter with frequency-independent positive feedback on the front panel between the two dampers. Coupling is caused by the fact that two amphtudic, frequency-equal, 180 ° phase-shifted vibrations hit the front plate with the opposite direction vector. At medium or even high frequencies, positive feedback plays a subordinate role because the damping factor of this low-pass system is high. Due to the large design of the dampers, the use of a soft damper material with sufficient load capacity is possible. The stiff design of the damper support and mounting surface cause a strong distribution of the vertical vibration energy over the surface of the damper. A damping system designed in this way still has a sufficient damping factor even at low frequencies even under positive feedback conditions. The deep and high-energy discontinuous frequencies in a hard disk are generated by the read / write head. Each type of hard disk has its own characteristic head swing behavior. The deep and high-energy steady vibration is generated by the unbalance of the rotating medium. Each hard disk has a typical rotation frequency according to its speed. The rotational frequency, which increases linearly with the rotational speed, produces a quadratic increase in the vibration energy with increasing rotational speed. The above-described damper system is extremely effective in damping the continuous rotational vibration if the layer thickness of the carrier surface vibration damper and the layer thickness of the fastening surface vibration damper are matched to one another in such a way that the damped vibrations of both dampers are typical of the rotating medium at the rotational frequency Hit the bracket area in phase with the opposite direction vector. Under these conditions, negative feedback of the damper system then takes place in the mounting area. According to the invention, this frequency-dependent negative feedback condition almost completely (the necessary different damper layers cause an amphtudic difference) completely cancel out the vibrations in the mounting area. This means that two in-phase vibrations hit the mounting area in the opposite direction and thus the mounting area is almost no longer in motion. Another prerequisite for the negative feedback condition is the choice of a damper material with an extremely low propagation speed of vibrations (considerably lower than in, for example, air) in order to influence the phase in the region of a half-wave (λ / 2) with the dimensions of the dampers that are possible here can. Due to the quasi rigid connection between the damper support surface and the damper mounting surface ensures that the required phase condition is always maintained (phase shift lock). Thus, the vibration energy is effectively dampened against the stiffened bracket area and thus against the chassis. At the same time, the self-oscillation of the hard disk or the holder of the hard disk is reduced to a negligible minimum, although the hard disk is mounted softly relative to the housing. This fulfills the requirements for hard drives. A hard disk must be mounted in such a way that natural vibration is avoided in order to prevent corrective positioning of the write / read heads, which means a loss in hard disk performance. In a further embodiment of the invention, the above-described damper system is provided with a device for quick and easy adjustment of the push-pull condition required for the negative feedback. A tuning plate is inserted between the damper mounting surface and mounting surface vibration damper. The tuning plate is guided by means of the fastening elements. In the middle on the outside of the damper mounting surface there is, for example, a threaded attachment with a threaded hole for a screw. The distance between the tuning plate and damper mounting surface can now be regulated from the outside using a corresponding screw. This allows the pretensioning of the two dampers to be increased and thus their layer thicknesses to be varied to a limited extent. If the dampers are already roughly dimensioned to a correct ratio, this device enables fine tuning to optimize the phase condition. In practice, however, it has been shown that good damping can also be achieved with a coarse setting.

It can be advantageous if the two dampers are made from different materials to further refine their damping characteristics or the dampers are constructed from several layers with different properties. In order to become frequency-independent in the case of counter-clock damping in the vertical direction, a construction may also be expedient which connects the damper support surface and damper fastening surface in a crosswise or force-deflecting manner and thus from the outset both plates only ever perform opposite movements. Thus, with a symmetrical design of the damper, there would be negative feedback of the vertically acting vibrations at any frequency. However, the construction required for this is comparatively complex in relation to the achievable benefits. In the context of this invention, it has been shown that the simple variant explained above is currently completely sufficient and, moreover, is also very inexpensive to manufacture.

In the context of a further embodiment of the invention, holes or openings can be recessed in the support surface vibration damper and in the mounting surface vibration damper in accordance with the load distribution. This measure causes a different mass distribution of the damper mass in such a way that even with non-adjustable fastening elements, the hard disk unit maintains a right-angled fit to the front plate after assembly. The elasticity of the dampers and thus the load-bearing capacity must be chosen such that no different compensations are required for the different load capacities required in the context of the inventions. This means that only one configuration of the plate damper is required for all assembly variants in mass production.

Due to the described embodiment of the invention, a correspondingly effective damping of the hard disk against impacts on the housing is now achieved by appropriate dimensioning of the damper layer thickness. Due to the type of suspension already explained, a rotary bearing for the mounting between the two push-pull dampers is formed on the front panel both in the horizontal and in the vertical direction. Due to the design of the damper surfaces and the position of the suspension points of the fastening elements engaging in the damper support surface, the shock absorbing effect is controlled in such a way that more degrees of freedom of movement arise in the vertical direction to the hard disk medium than in the horizontal direction. Thus, there is more shock absorption in the vertical direction than the horizontal direction. The shock sensitivity of a hard disk is always greatest in vertical Direction to the medium, since the writing / reading heads move extremely close along the medium.

The inexpensive damper system according to the invention thus brings about both a reduction in noise in the housing and extremely effective shock absorption and thus protection of the hard drive which is sensitive to impacts.

The holder assigned to the hard disk can be designed differently depending on the requirements and, in addition to holding a hard disk, can also be used to hold further components, as will be described below. Depending on the design of the hard drive and the type and scope of the additional components that are held on or in the holder and the nature of the material of the holder, the high-frequency vibrations emanating from the hard drive can be amplified by resonances with the holder or the other components or their combinations of high-frequency noises. In such cases, according to the invention, a vibration-damping intermediate layer is arranged between the hard disk and the holder, which has high damping for high-frequency vibrations, according to the invention. The fastening elements engaging in the hard disk are supported on the holder assigned to the hard disk via vibration-decoupling documents. A high-frequency oscillation emanating from the hard disk is thus dampened with respect to the holder and the further components connected to it in such a way that the usual high-pitched whistle is barely or no longer perceptible when the computer is operating.

It is also advantageous here if the hard disk, the vibration-damping intermediate layer and the holder are in large-area contact in order to distribute the vibration energy well over the surfaces, so that a maximum yield of the damping effect is achieved. Hard rubber washers, to which washers are attached, for example made of metal, are particularly suitable as supports. For a better distribution of the contact pressure of the fastenings engaging in the hard disk on the side walls of the mounting, a summary of the documents relating to a flat component has proven to be advantageous within the scope of the invention. The individual hard rubber discs now form a rectangular, elongated rubber part with several, in the special case e.g. three through openings and a correspondingly shaped metal piece with three through openings. This construction is referred to below as the torque distributor bridge. The torque distributor bridge is designed in such a way that it distributes the respective tightening forces of the fastening elements evenly over the hard rubber base on the bracket side wall. Within the scope of the invention, a 4 mm thick steel sheet has proven to be expedient. The same effect can be achieved with other configurations such as a U-profile made of thinner sheet metal. This means that the module is almost completely isolated from the bracket with regard to high-frequency structure-borne noise. On the one hand, the still relevant radiation area for high-frequency vibrations is limited to the surface of the hard disk and, on the other hand, there is additional vibration damping. The fact that vibrating contact surfaces to the surrounding air medium are reduced to the minimum of the hard disk surfaces is particularly advantageous

With the measures explained above and the arrangements of the assemblies apparent from the drawings, with the help of the damper support surface and the slot around the hard disk, which is formed by the bracket itself or by the holder and the overlying cage, which is formed by the High-frequency sound emitted from the hard disk into the surrounding air, reflected from the front of the case towards the rear of the case. The inside of the housing cover and the base plate of the chassis can be at least partially lined with a flame-retardant layer material in order to further reduce the noise. However, the use of dam mats becomes unnecessary, as will become apparent in the further course of this description. If in a housing of the type mentioned one or more hard disk (s) is or are held with the interposition of an anti-vibration intermediate layer, it is recommended that the anti-vibration intermediate layer additionally has good thermal conductivity, that the intermediate layer has at least one large-area contact with two Side walls of the holder has that at least parts of the surfaces of the holder are exposed to the air circulation prevailing in the housing, and that the holder (s) is or are made of a good heat-conducting material. The largest heat sources of the hard disk are formed by the drive for the hard disk medium and the servo of the write / read heads. These are usually firmly connected to an aluminum die-cast part, which forms the hard disk body. Therefore, the best possible heat removal takes place on the two long sides of the hard drive body, which are also used for fastening and - to a limited extent - on the back. However, since the long sides of the hard disks usually have bumps, it is necessary to design the attachment in such a way that the bracket side walls press the vibration-damping and heat-conducting intermediate layer against the long sides of the hard disk with sufficient contact pressure in order to make the best possible surface contact with the hard disk. This fact is favored by the fact that the same measure, in the above-described high-frequency vibration damping, is also required, and thus there is no constructive contradiction to the combination of the two measures. It has been found in the context of this invention that a vibration-damping intermediate layer with good thermal conductivity of a thickness of approximately 0.45 mm is sufficient to sufficiently dampen, to compensate for the unevenness by appropriate contact pressure and to produce a high heat dissipation to the holding device Invention e aluminum material used for the bracket. The aluminum bracket with the good thermal connection to the hard disk forms a considerably larger cooling surface for the hard disk. In this respect, a bracket made of aluminum has the function of a heat sink in addition to the bracket function. If the holder is at least partially in the airflow of the case fan, this passive cooling is sufficient for hard disks up to medium power in most cases. In the context of this invention, it is expedient to use a tape material made of silicone-rubberized Isohermateπal for the vibration-damping intermediate layer. However, it is also conceivable for the silicon material to be coated directly onto the holder. A coating on the long sides of the hard disk is also conceivable. In this respect, the silicone tape is also generally referred to below as a vibration-damping intermediate layer.

As part of a further embodiment of the invention, the cooling capacity can now be gradually expanded as required. According to a preferred embodiment of the invention, cooling fins or heat sinks are added to a holder which is assigned to a hard disk to increase the cooling capacity. These cooling elements expediently protrude at least partially into the air flow generated by the main housing fan (s). In the context of this invention, the cooling fins are preferably arranged on the outside of the holder. The heat dissipated from both mounting side walls can thus be conducted directly into the cooling elements in the shortest possible way. Holders made of copper material or other good heat-conducting materials are also conceivable here. In the context of this invention, it has proven to be advantageous either to connect a heat sink in the form of an independently formed m direct metallic system to the holder via screw connections or to use holders with integrated cooling fins. If the heat sink and bracket are separate components, it is advantageous from an assembly point of view to design the bracket in one piece. If cooling fins are integrated in the bracket, it is advantageous to design the bracket in two parts. Then extruded profiles made of aluminum are optimal. In the context of the various exemplary embodiments described below, it can be seen that the mounts assigned to the hard disks can also be used only for holding cooling elements and therefore do not necessarily always have to be used simultaneously for holding hard disks. As part of a further embodiment of the invention, as an alternative to the heat sinks explained above or in addition, an increased cooling capacity can be achieved by means of a fan attached to the side wall of the holder. For this purpose, a group of through openings are provided on the wall of the bracket above and below the hard disk, which together form a passage for the air flow generated by the fan. In order to lead the air flow generated by the fan completely through the groups of through openings, use is made of a seal as a base between the side wall and the fan. This fulfills the manufacturer's requirements for ventilation by means of an air stream above and below the hard disk. The fastening elements for the fan engaging the bracket side wall are supported directly on the fan and are guided through holes in the seal. For this purpose, threads or self-tapping threads are expediently provided in the holder side walls. If the fastening elements of the hard disk are supported by a torque distribution bridge, the seal must have a passage for the bridge at least at one point. This enables sufficient airflow above and below the hard disk. In the maximum expansion stage of the cooling described above, the invention enables that even if the hard disk fan fails, the currently strongest 1 inch height hard disks do not exceed their permissible maximum temperature even at an ambient temperature of 40 ° C. However, the fact that even the strongest hard drives with an intact cooling system up to the most extreme ambient temperatures can still be kept close to the temperature specified by the manufacturer for maximum service life seems far more important. In this respect, a very important contribution is made to the lifespan of the hard drives. This cooling method is not limited to 1 inch hard drives. Due to adapted geometric designs, this method can also be used for the 1.6-inch (and larger) height hard drives available on the market.

From an environmental point of view, it is now advantageous to dispense with the use of insulating materials for lining the inside of the housing in a further embodiment of the invention. In order to maintain the sound emission values achieved so far, it is therefore necessary to reduce the number of sound sources in the housing and to take further measures. As already described in the introduction, the fans also produce noise, especially when there are a number in the computer. According to the prior art, the CPU is cooled passively by means of a heat sink. This eliminates the CPU fan. There is also no additional fan on the housing air inlet. The advantageous design of the passive hard disk cooling makes the hard disk fan unnecessary.

In a further embodiment of the invention, the heat sink is an integral part of the holding device assigned to the hard disk. The simplest version is e.g. around a bracket made of two aluminum U-profiles, each of which is firmly connected to the damper support surface on one end. The hard disk is installed between the two webs of the U-profiles as previously explained. The legs of the U-profiles form an almost complete slot around the hard disk in the longitudinal direction above and below the hard disk. The remaining gap between the legs of the U-profiles is negligible in terms of sound and flow.

If, in the case of a housing of the type mentioned at the outset, one or more hard disk (s) are, as explained above, assigned to one or more holder (s), it is recommended that the holder form a slot around the hard disk so that the distances between the upper and Underside of the hard drive and the corresponding shaft sides are dimensioned such that λ / 4 of the highest acoustic interference frequency are not exceeded so that the structure forming the shaft around the hard drive cannot be excited by the hard drive to resonate vibrations that at least on one side of the shaft partial reflection of sound waves takes place and that the inside of the shaft, the top and bottom of the hard disk are exposed to the air circulation in the housing. This prevents the sound pressure from developing fully within the shaft. All sound waves that propagate perpendicular to the hard disk surfaces are particularly affected. What remains is the harmonic content of the acoustic disturbance variables, which is then perceptible as a quiet noise. In electroacoustics, the remaining harmonic content of a frequency spectrum, by filtering out spectral components using high-pass filters, is also known as pink noise. According to the invention, the λ / 4 dimensioning of the shaft is therefore a mechanical high-pass filter. This mechanical λ / 4 high-pass filter thus causes a strong vibration damping of the air medium excited by the hard disk in the immediate vicinity of the hard disk surfaces. The effect of this measure is so strong that insulation mats can be dispensed with. In addition, as explained below, air ducts can now be routed directly outwards from the sound source via a partially reflective end face at the end of the shaft, without impairing the low noise emission already achieved. This means that the λ / 4 dimensioning at the same time enables the problem-free maintenance of an optimally guided cooling air flow from the outside, at least above and below the hard disk. The end surface can be formed, for example, by the damper support surface.

The air intake of the housing now takes place by means of aligned bores through the damper layers and the plates in such a way that the hard disk and holder receive freshly sucked-in air for cooling directly from the outside of the housing. This creates a group of holes outside the U-profile shaft and a group of holes inside the shaft. It is advantageous that an air flow is now simultaneously maintained on all surfaces of the hard disk and the cooling holder. With this design, an enormous cooling capacity is already achieved using small amounts of materials, e.g. Aluminum, and achieved with significantly lower air flow. According to the invention, a fan is no longer required even for cooling the most powerful hard disks. Of course, the cooling capacity can be further increased by expanding the U-profiles with cooling fins. It is also particularly advantageous in this embodiment that the space requirement in the housing and the weight of the hard disk mounting unit are considerably lower. By eliminating a fan to cool the hard drive, the noise is further reduced. In the best case, all that remains is a main fan in the power supply to maintain an air flow in the case.

It is particularly advantageous if, through better load distribution of the hard disk unit to the dampers, an even softer damper material is possible. With a softer damper material, the damping factor can be further increased compared to the chassis. This is advantageous for a higher damping of the discontinuous head vibrations.

In a further embodiment of the invention, the hard disk is now attached completely freely between two dampers. It is now advantageous that no fastening elements have to penetrate a mounting surface. For this it is necessary that suitable mounting surfaces are first arranged on two opposite sides of a hard disk. Carrier surfaces and mounting surface vibration damper are now molded parts, each of which additionally encompasses the damper carrier surface and mounting surface of the hard disk on all sides. The opposing mounting surfaces either contain integrated or additionally attached sleeves, which in turn each encompass the support surface and the mounting surface vibration damper. Is the damper mounting surface on the front of the hard drive, and this is an independent component, a suitable opening for the bus and supply plug is provided on the corresponding mounting surface, on the damper mounting surface and on the mounting surface vibration damper. In order to achieve the condition for negative feedback, the opposing mounting surfaces must be in a mechanically rigid relationship to each other. The easiest way to create this condition is in a suitable cuboid housing. Any other suitable, even open, construction can serve this purpose. Two opposite sides of the cuboid housing form suitable mounting surfaces for the carrier surface vibration damper and the mounting surface vibration damper. The The remaining four sides of the cuboid then form the cuffs for the dampers. Since the hard disk is now freely supported between the dampers, this arrangement allows both vertical vibrations and horizontal vibrations to the damper level. In order to also achieve negative feedback for the horizontal vibrations, it is necessary to design the layer thickness of the damper lugs enclosing the hard disk asymmetrically. This configuration is therefore identical to the previous ones in the possible development of its effect. Since the weight load is now supported on two opposite sides of the hard disk, it is possible to use an even softer damper material or to reduce the contact areas of the damper. This further increases the damping factor for the housing. As already explained above, aligned bores through the respective opposite layers provide the appropriate ventilation. It is also advantageous that the cuboid housing now forms a further shaft so that the external air flow can also run without mixing with already warmed air until it emerges from the suitable mounting surface for the mounting surface vibration damper. An advantageous side effect of the cuboid housing is that the inventive configurations and the hard disk can now form a closed and thus ESD-protected unit.

The invention is described in detail below with reference to 9 exemplary embodiments and the attached drawing. Show it:

1 is a perspective view of a housing designed in the manner according to the invention after removal of the housing cover;

Fig. 2 is a sectional view of a hard disk unit from behind, consisting of fan, seal, bracket, damper support surface, hard disk, vibration-damping thermal interface, fasteners of the hard disk, heat sink, fasteners of the heat sink, each with a sectional plane through the fasteners of the heat sink and a sectional plane the middle fasteners of the hard drive;

Fig. 3 is a side view of the bracket without fan, which with the for deep

Frequencies suitable push-pull dampers to the front panel of the

Housing is attached, wherein the damper support surface, the support surface vibration damper, the stiffening plate, the

Mounting surface vibration damper, the damper mounting surface and a mounting screw are shown in section;

Fig. 4 is a schematic view of a Haltemng compared to the embodiment of FIGS. 2 and 3, in which the

Carrier plate vibration damper is attached directly to the hard disk without the intermediary of a separate damper carrier surface,

5 shows a hard disk unit in which the carrier surface vibration damper has a separate part which forms part of a holder,

Damper support surface is connected to the damper assembly;

6 and 7 are a side view and a rear view of a compared to in

Connection with the exemplary embodiment described in FIGS. 3 and 2 modified hard drive unit with a hard drive holder consisting of two parts with a U-shaped cross section and holding the hard drive to form shafts on the top and bottom; Fig. 8 is a sectional view through a tunable damper assembly in

Comparison to Figure 3 on an enlarged scale;

9 shows a perspective interior view of a housing cover with layered material plates for sound insulation;

10 and 11 are a side and rear view of a hard disk with one of them

Damper assembly arranged in the end face, in which the holding face is arranged on the outside of the carrier face vibration damper facing away from the hard disk. Here, the hard disk is connected to the damper support surface through a through opening in the damper mounting surface and the mounting surface vibration damper; 12 and 13 are a plan view and a corresponding one in the sectional view of FIG. 3

Sectional view of an assembly corresponding to the functional structure of the damper assembly shown in FIG. 10, in which the hard disk is held on the damper support surface without breaking through the damper mounting surface and the mounting surface vibration damper;

14 and 15 are a sectional plan view and a rear view of a

Hard disk unit, in which the carrier surface vibration damper and the mounting surface vibration damper of the damper assembly are each in direct contact on opposite sides of the

Hard disk are arranged;

16 and 17 a solution which is functionally comparable to the exemplary embodiment according to FIGS. 14 and 15, in which the carrier surface vibration damper and the fastening surface vibration damper are assigned to opposite sides of the hard disk, but the damper is provided via a separate damper carrier surface or damper mounting surface are connected to the hard disk; 18 and 17 a hard disk unit which has been further developed compared to the exemplary embodiment according to FIGS. 16 and 17, in which the hard disk is arranged using a vibration-damping intermediate layer in a holder composed of two holder parts; 19 and 20 each show a schematic sectional view and top view of a

Hard rubber underlay as vibration decoupling of the hard disk fastenings, as can be used in the exemplary embodiments according to FIGS. 18, 12 and 13, FIGS. 6 and 7 and FIGS. 2 and 3;

21 and 22 corresponding views of a torque distributor bridge which can be used in conjunction with the hard rubber base according to FIGS. 19 and 20 as a base for the hard disk fastening; 23 and 24 support surface or mounting surface vibration damper with

Compensation holes in top view;

25, 26 and 27 are top views of a bore surface and Fastening surface vibration damper which, with aligned 6 and 7 holes, which allow the flow of cooling air through the damper assembly;

Fig. 28 is a plan view of a vibration damper, such as in the embodiment of Figures 10 and 11 as

Mounting surface vibration damper is provided;

29 is a plan view of a carrier surface or fastening surface.

Vibration damper, as used in the embodiment according to Figures 14 and 15, with through holes for

Hard disk are provided for plug connections; and

30 and 31 a plan view of the exemplary embodiments according to FIGS. 16,

17 and 18 shown damper assemblies used support surface or mounting surface vibration damper.

First of all, in connection with FIGS. 1 to 3, 8 and 23, 24, the housing according to the invention is described as sound-absorbing and / or shock-absorbing with a motor-driven assembly, which in the special case is formed by a hard disk. The block-shaped housing made of conventional sheet metal, designated in its entirety by 1, has a framework 2, on the front of which a front plate 33 with operating elements (not shown) and a base plate 4 are fastened. A main fan 5 is installed in the rear upper part of the housing 1 and blows the internal air out of the housing 1 through the power supply unit 53 and further through slots 7 in the rear wall 6. The auxiliary fan 9, which is attached in the lower part of the front plate 33, sucks in the outside air through slots (not shown) in the front plate 33 and blows it into the interior of the housing 1. The arrangement of the main fan 5 and the additional fan 9 guides the cooling air flow approximately diagonally through the interior of the housing 1. The cage 29 contains a floppy disk holder with a built-in floppy disk 45.

A cage-like holder 10 in the illustrated case (FIGS. 2 and 3), consisting of a side wall 12 with a fastening edge 71, a side wall 14 opposite the side wall 12 with a fastening edge 73, a manhole bottom 16 with a fastening edge 72, is inserted into the fastening edge 71 engaging rivets 22, 24, by the rivets engaging in the fastening edge 73, rivets 26, 28 and the rivets engaging in the fastening edge 72, not shown, fastened to the damper support surface 50. A hard disk 20 is held between the two side walls 12 and 14 by means of screws 11, 13, 15, 17, 19, 21 in the holder 10. The hard disk 20 includes, among other things, a drive, not shown, which drives the storage medium at the usual high speeds and a servo, not shown, which drives the write / read head.

The unit explained above, consisting of a holder 10 with a damper support surface 50 and the then mounted hard disk 20, is - as can be seen in particular in FIG. 3 - attached to the support surface 3 with a stiffening plate 52 in such a way that between the damper support surface 50 and a mounting surface vibration damper 51 is arranged on the mounting surface 3 with the stiffening plate 52. The surface of the support surface vibration damper 51 extends essentially over the entire surface of the damper support surface 50 and separates it in structure-borne noise from the mounting surface 3 with stiffening plate 52. The fastening elements 23, 25 and 27, which engage the damper support surface 50, are designed as screws for mounting the unit explained above, are supported on the outside of the mounting surface 3 via a damper mounting surface 55 and a mounting surface vibration damper 74 arranged between the mounting surface 55 and the mounting surface 3. The surface of the mounting surface vibration damper 74 extends essentially over the entire surface of the damper mounting surface 55 and separates it from the mounting surface 3 in terms of structure-borne noise. The fastening elements (screws) 23, 25, 27 are insulated from the holding surface 3 and the stiffening plate 52 and are easy to move.

The carrier surface vibration damper 51 has a layer thickness of approximately 16 mm and the fastening surface vibration damper 74 has a layer thickness of approximately 8 mm. Both dampers 51 and 74 are made of an identical semi-elastic, soft material. Both dampers 51 and 74 thus have excellent damping properties in the lower frequency range. The fastening elements (fastening screws) 23, 25 and 27 engaging in the damper support surface (50) hold both dampers 51 and 74 under slight pre-tension if they have the stop position during assembly. The fastening edges 71, 72 and 73 of the holding member 10 form the stop for the fastening elements 23, 25 and 27. Thus there is a quasi-rigid connection between the damper carrier surface 50 and the damper fastening surface 55 generated by the above-mentioned pretension by means of the fastening elements 23, 25 and 27. The dimensions of the two dampers 51 and 74 now dampen the low-frequency vibrations generated by the hard disk 20 well against the holding surface 3 with the stiffening plate 52. Only a residual vibration energy formed by the damped vibration of the mounting surface vibration damper 74 and the carrier surface vibration damper 51 acts on the holding surface 3. Thus, the vibration energy transmitted to the framework 2 and thus to the entire housing 1 is reduced to a minimum. In particular, this also reduces the natural vibrations of the hard disk 20 to a minimum.

In a further embodiment of the above-mentioned push-pull damping, the phase shift of the damper system, as shown in FIG. 8, is designed to be adjustable, which allows the push-pull coupling explained above to be optimized. A tuning plate 75 is inserted between damper mounting surface 55 and mounting surface vibration damper 74. The tuning plate 75 is guided through bores, not shown, on the shafts of the fastening elements 23, 25, 27, not shown. In the geometric center of the damper mounting surface 55 there is a boring, not shown in detail, with a threaded attachment 77. The set screw 76 engaging in the threaded attachment 77 passes through the damper mounting surface 55 and is supported on the tuning plate 75. By turning the adjusting screw 76, the tuning plate 75 can be pressed off the damper mounting surface 55. This causes a change in the layer thickness of the mounting surface vibration damper 74 and of the carrier surface vibration damper 51. Analogously, as shown in FIG. 12, the tuning plate 75 is arranged such that it can be adjusted outwards against the holding surface 3.

The above-described arrangement of the bracket 10 with the then held hard disk 20 and further components to be explained below, consisting of damper carrier surface 50, carrier surface vibration damper 51, stiffening plate 52, mounting surface 3, fastening surface vibration damper 74 and fasteners 23, 25 and 27, due to the elasticity of the two dampers 51 and 74, around the mounting surface 3 now also a rotary position with a small deflection angle in the vertical and horizontal directions to the housing 1. If the housing 1 is pushed from the outside, the two dampers 51 and 74 also act as shock absorbers to protect the hard disk 20, since the Haltemng 10 with then held hard disk 20 can perform a damped deflection movement both in the vertical and in the horizontal direction.

With a layer thickness of, for example, 16 mm for the carrier surface vibration damper 51 and a layer thickness of 8 mm for the mounting surface vibration damper 74, it has been shown that impacts in the vertical direction on the housing 1 are reduced by up to 90% or by a factor of 10 on the hard disk 20 act. Above all, the dangerous rising edges of braking acceleration are significantly reduced. Overall, this enables a somewhat higher braking acceleration on the hard disk 20. An impact of 30 g on the housing 1 means an impact of approximately 3 g on the hard disk 20 with a greatly reduced rising edge of the braking acceleration This measure is sufficient to effectively protect the hard disk 20 against typical bumps against the housing 1 that occur in everyday office life.

In order to enable a right-angled seat, the hard disk unit explained above, relative to the front plate 33, the two dampers 51 and 74 according to FIGS. 23 and 24 contain compensation holes 31 arranged according to the load distribution.

As can be seen in particular in FIG. 2, between the hard disk 20 and the holder 10 there is a broad vibration-damping intermediate layer 30 on all sides of the two hard disks (not shown) - long sides and back, i. H. interposed along the two side walls 12, 14 and along the damper support surface 50. The width of the vibration-damping intermediate layer 30 extends essentially over the entire height of the hard disk 20 and, with good surface contact, causes the hard disk 20 to be damped in the high-frequency acoustic spectrum. To decouple structure-borne noise from the hard disk 20 from the bracket 10, the fastening screws 11, 13, 15, 17, 19, 21 which engage in the hard disk 20 are supported on the bracket 10 via the two torque distribution bridges 61 and 63 and between the torque Distributor bridge 61 and the side wall 12 attached vibration-isolating rubber pad 62 and the vibration-isolating rubber pad 64 attached between the torque distributor bridge 63 and the side wall 14. The surface of the two rubber pads 62, 64 and the two torque distributor bridges 61, 63 are each identical and are shown in detail in FIGS. 19, 20 and 21, 22. So the pad 62 is made of hard rubber. Central projections 37 rise from the surface of the hard rubber base 62 and protrude into bores (not shown) in the side wall 12, 14. The base 62 is provided in the center of the lugs 37 with through holes 35 for the screws 11, 13, 15, 17, 19 and 21. The central lugs 37 prevent the fastening screws 11, 13, 15, 17, 19, 21 from touching the two side walls 12, 14. If the fastening screws 11, 13, 15, 17, 19, 21 are tightened, the two torque distribution bridges are tensioned 61, 63 over the two hard rubber pads 62, 64, the two side walls 12, 14 and the vibration-damping intermediate layer 30 firmly and flatly on the two long sides, not shown, of the hard disk 20. Thus, the high-frequency acoustic vibrations of the hard disk 20 are damped with the intermediate layer 30 and with the two hard rubber pads 62, 64 decoupled from the Haltemng 10. The damped high-frequency vibrations of the hard disk 20 can now only be emitted to the surrounding air medium in the housing 1 via the upper side 78 and the underside of the hard disk 20, not shown.

With the side walls 12, 14, the shaft floor 16, the damper support surface 50 and the cage 29 with a floppy drive 45, a shaft 39 is formed around the hard disk 20 with an opening in the direction of the rear wall 6 of the housing 1. Thus, the remaining one Portion of the high-frequency sound emitted to the air from the hard disk 20 is reflected away from the front plate 33 in the direction of the rear wall 6. Further sound insulation can now be achieved if the three-sided cover 8 of the housing 1 according to FIG. 9 is at least partially lined on the inside with sound-absorbing composite panels 46, 47, 48, 49, each of which consists of a layer of bitumen, a foam layer and a polyurethane layer consists. A further composite material plate 43 is applied according to FIG. 1 on the base plate 4 from the housing 1.

Measurements in a low-reflection room with a sound-proof surface between the computer and the measuring microphone on the housing 1 including cover 8 equipped according to the invention have shown that if the computer is equipped with 4 fans and a 1 inch height hard disk 20 of the Seagate Cheetah ST34501W type (10,000 rpm ) at a distance of one meter in front of the front panel (not shown) of the closed housing 1, operating noise of 36 dB (A) without hard disk access was recorded. With permanent access to the hard disk 20, a level of 37 dB (A) was measured. Without additional fan 9, operating noise of only 32 dB (A) without hard disk access was recorded. The above-mentioned, 0.45 mm thick silicone rubberized Isohermateπal used as vibration-damping intermediate layer 30 also has good thermal conductivity properties, as is evident from its thermal conductivity of about 0.0021 cal / cm s ° C. Thus, the silicone rubberized Isohermateπal not only provides excellent damping for high-frequency structure-borne noise, but also additional heat dissipation of the waste heat emanating from the hard disk 20 directly to the two side walls 12, 14 of the holder 10 and also directly to the damper support surface 50. Thus, in addition to reducing the acoustic surface of the hard disk 20 explained above, the thermal surface of the hard disk 20 is simultaneously increased. If the Haltemng 10 consists of an aluminum material and is at least partially in the airflow of the case fans 5 and 9, a hard disk 20 medium power can be effectively cooled passively. Thus, the bracket 10 with the side walls 12, 14 and the shaft bottom 16 has the character of a heat sink.

To increase the measures for cooling a hard disk 20, a heat sink 18 with a plurality of cooling fins 85 is fastened to the shaft bottom 16 of the two mounting sides 12, 14 with good heat-conducting properties. The screws 56, 57 engaging in the heat sink 18 and other screws (not shown) or a plurality of such fastening elements are supported by a torque distributor plate 70 on the inside of the shaft bottom 16 and ensure effective heat transfer between the shaft bottom by means of a sufficient contact force 16 and the heat sink 18. Thus, a main heat dissipation path is formed, which is the shortest way from the two, not shown, long sides of the hard disk 20, via the heat-conducting intermediate layer 30, to the side walls 12, 14 of the holder 10 and with the shaft bottom 16 directly the heat sink 18 runs. If necessary, a heat conductor 60 can be attached between the shaft bottom 16 and the heat sink 18. The heat conductor 60 can be made of any material suitable for this purpose. The cooling fins 85 of the heat sink 18 are, as shown in particular in FIG. 1, at least partially the diagonal cooling air flow of the case fans 5 and 9 with the mentioned inlet openings on the underside of the front plate 33 and the mentioned outlet protector 7 on the rear wall 6. The heat sink 18 carries considerably for heat dissipation and thus for cooling the hard disk 20.

As an alternative to the heat sink 18 or in addition to further increasing the cooling capacity, a hard disk fan 40 is mounted on the side wall 12 to the side of the hard disk 20. For this purpose, a corresponding passage is required on the side wall 12 in order to pass on the air sucked in by the fan 40 to the hard disk 20. As shown in FIG. 3, there are a group of through openings 41 and 42 above and below the hard disk 20. Between the through openings of the group 42 there are spaces 43 which still provide adequate heat dissipation through the metal of the side wall 12 on the shaft bottom 16 allow at these points. Furthermore, drive threads 36 are provided on the side wall 12 for fastening the hard disk fan 40. As can be seen in FIG. 2, the fan fastening elements 65, 67 engaging in the driving thread 36 on the side wall 12 and further fastening elements (not shown) are supported directly on the fan. Between the fan 40 and the side wall 12 there is a seal 44, which completely passes the air flow through the perforated groups 41 and 42. The fastening elements 65, 67 and further fastening elements, not shown, are guided through the seal 44. If the hard disk 20 is fastened with torque distribution bridges 61, 63 and corresponding documents 62, 64, at least at one point on the seal 44 an appropriate passage, not shown, is required. In connection with the already mentioned slot 39 around the hard disk 20, air flow is now maintained over the entire upper side 78 and underside of the hard disk 20, not shown. Since the fan 40 is closest to the case fan 9 and thus the air outlet (not shown), the hard disk 20 is effectively cooled with fresh air which has not been preheated. On the side wall 12 there is a thread 38 for receiving a possibly required, not shown, thermal sensor for temperature monitoring. When mounting the hard disk 20 in the housing 1 by means of vibration dampers, the arrangement of the vibration dampers thus takes place on one side of the hard disk 20, the carrier surface vibration damper 51 and the mounting surface vibration damper 74 being thus arranged on opposite sides of the holding surface 3 of the housing 1 . This holding surface 3 is formed in the special case by the - sufficiently stable - front plate 33 of the housing 1.

This basic concept of the hard disk assembly is illustrated in a still simplified form in FIG. 4, where the damper support surface 50 is not formed on its own component but on the hard disk 20 itself, i.e. the carrier surface vibration damper 51 is attached directly flat to an outer surface of the hard disk housing. This simplified form of assembly is possible in particular in the case of vertical mounting of hard disks 20 which have an overall height of 1.6 inches or more. Due to their size, such a hard disk 20 offers sufficiently large outer surfaces for direct flat installation of the dampers. The fasteners 23, 25, 27 engage in the thread 88 em, which are embedded in the hard disk housing. The end stop for the fastenings 23, 25, 27 is determined by the immersion depth of the thread 88.

In the hard disk assembly illustrated in FIG. 5, on the other hand, a separate damper support surface 50 is provided in the form of the separate plate shown, which in turn establishes the connection to the hard disk 20 by direct screwing, not shown, with or as part of a separate hard disk holder. Here, the fastenings 23, 25, 27 engage in threads, not shown, which are embedded in the damper support surface 50. The end stop for the fasteners 23, 25, 27 is formed by the side surface of the hard disk 20.

6 and 7, the basic assembly concept of the exemplary embodiment described according to FIGS. 2 and 3 or 5 is modified in that the hard disk 20 is arranged within a two-part holding device 10, the holding parts 10a and 10b of which are each of a basically U-shaped cross section. Shaped profile are formed, which are pushed from the opposite longitudinal sides of the hard disk 20 with the legs 79, 80, 81, 82 over the top 78 and bottom of the hard disk 20. By means of cooling fins 85 provided on the outer sides of the holding parts 10a, 10b, the cooling body 18 is, so to speak, an integral part of the holding element 10. The fastening edges, not shown here, of the holding parts 10a, 10b are formed by the respective end faces of the holding parts 10a, 10b. The damper support surface 50 is firmly connected to the end faces of the mounting parts 10a, 10b by screw connections, not shown. The end stop for the fastenings 23, 25, 27 is formed by the end faces of the mounting parts 10a, 10b. The bracket 10 composed of the bracket parts 10a and 10b is dimensioned in its clear internal dimension so that between the top 78 and the bottom of the hard disk 20 and the inside of the facing surfaces of the bracket 10, which are from the legs 79, 81 of part 10a and the legs 80, 82 of part 10b of the bracket 10 are formed, each em shaft 39 is formed. The shaft 39 can be flowed through with air drawn in from the rear of the bracket 10 if the vibration dampers 74 and 51 m are provided with openings or bores 66 and 68 in the manner illustrated in FIGS. 25, 26 and 27, to which at least m is plate-shaped Damper mounting surface 55 (in the embodiment according to FIGS. 6 and 7) and the separate damper support surface 50 adjoining the support surface vibration damper 51 are assigned aligned openings or bores 66 and 68, respectively. In this case, 66 channels are formed through the aligned inner bores provided in the parts of the damper assembly, which channels open into the shafts 39. The bores 68 formed in the outer region guide the air sucked in from the front plate 33 in the housing 1 along the outside of the holder parts 10A, 10b of the holder 10 and along the cooling fins 85 which may be integrated in the holder 10. The connections for data plug 58 and power plug 59 provided on the front of hard disk 20 are still accessible through the open front of Haltemng 10. Between the legs 81 and 82, which form the slot 39 on the upper side 78 of the hard disk 20, and the legs 79 and 80, which form the slot 39 on the underside of the hard disk 20, there is a gap 83. The gap 83 compensates for the Manufacturing tolerances of hard disk 20, Haltemng 10 and intermediate layer 30. The gap 83 is dimensioned as small as possible so that no sound pressure can escape at the gap 83.

FFT measurements on a hard disk 20 rotating at 10,000 rpm showed that the highest relevant acoustic interference frequency still occurred at 9 kHz. From the point of view that the clear internal dimension to the top 78 and bottom of the hard disk 20 λ / 4 does not exceed the highest acoustic interference frequency to be expected, an advantageous clear internal dimension for the shaft 39 of 8 mm could be determined for this exemplary embodiment. The bores 66 which open into the shaft 39 are made smaller than the bores 68. The surface remaining after deduction of the occupied surface for the bores 66 (FIG. 7) from the damper support surface 50 in the shaft 39 provides for a partial reflection of Sound waves which move in the direction of the bores 66.

Furthermore, it was found to be particularly advantageous in the exemplary embodiment explained above for the holder 10 to be designed in such a way that its resonance frequencies are above the highest, least or undamped frequencies still reached by the hard disk 20. Holding parts 10a and 10b in cross-section formed as U-shaped aluminum profiles, this purpose with a thickness of 4mm perfectly.

9 shows an additional possibility of improving the sound insulation of the housing 1 as a whole by composite panels 46, 47, 48, 49 glued to the inside of a housing cover 8 and composite panel 43 glued to the base plate 4. This is an additional option for sound insulation, which, however, based on the measures explained above, will be unnecessary. Noise measurements on the above-described embodiment, with the measurement conditions already described, without composite panels 43, 46, 47, 48, 49 and using only one main fan 5, gave an operating noise of only 30 dB (A) without hard disk access.

A second category of hard disk mounting with a damper assembly is illustrated using the exemplary embodiment in FIGS. 10 and 11. The damper support surface 50 is fastened to the rear of the hard disk 20 with screw connections, not shown, or is an integral part of the hard disk body. Carrier surface vibration damper 51 and mounting surface vibration damper 74 are arranged on the opposite sides of the damper support surface 50. The Haltemngsfläche 3 and the damper mounting surface 55 form the outer mounting surfaces. The damper mounting surface 55 and the mounting surface vibration damper 74 contain a through opening 89 for the hard disk 20. Here dampers as shown in FIG. 28 are used.

Another, functionally identical to the above embodiment, the possibility of installing a hard disk with a damper assembly according to category two is illustrated with the aid of the exemplary embodiment in FIGS. 12 and 13. As can be clearly seen in particular from FIG. 12, the bracket 10 can also consist of a wide-area U-plate. The two legs of the U form the mount side walls 12 and 14 and the web part of the U now forms a m m the mount 10 integrated damper support surface 50 with a sufficient distance from the rear side of the hard disk 20, not shown. The damper support surface 50 is also here held between carrier surface vibration damper 51 and mounting surface vibration damper 74. The damper fastening surface 55 is also seated on the rear side of the damper carrier surface 50 and is supported from there via the fastening surface vibration damper 74 on the rear side of the damper carrier surface 50. The fastening elements (screws) 23, 25, 27 engaging the damper fastening surface 55 are supported either on the holding surface 3 or on a tuning plate 75 which is still connected upstream. The Carrier surface vibration damper 51 also sits here between damper support surface 50 and holding surface 3. The construction variants of this second category are recommended, for example, if there is only a small amount of space available between front plate 33 and front panel (not shown). Accordingly, the hard disk unit protrudes deeper into the interior of the housing 1.

As shown in FIG. 13 in particular, the side walls 12, 14 are flanged directly onto a heat sink 18 that fits between them. It is also conceivable that the side walls 12, 14 each have a fastening edge at the bottom in order to be fitted with a wider heat sink 18 from below. In both cases, the heat sink back forms the shaft floor 16.

A third category with a similar concept for the design of the damper assemblies, as described in the previous exemplary embodiments, is shown below in connection with FIGS. 14, 15, 16, 17 and 17, 18. Common to these exemplary embodiments is the mounting of the hard disk 20 on two opposing sides of the hard disk 20 arranged support surface vibration dampers 51 and mounting surface vibration dampers 74. Here too, as in the second category, the vibration energy of the hard disk 20 is delivered to the dampers between the two dampers .

In the exemplary embodiment shown in FIGS. 14 and 15, these dampers are now designed as molded parts with lateral shoulders 97 and 98, which enclose the hard disk 20 m in each case in direct contact on two opposite sides. The damper support surface 50 and the damper mounting surface 55 are thus formed integrally from two opposite sides of the hard disk 20 itself. The bracket designated as 91 for the hard disk unit connects two mounting surfaces 92 and 93 on two opposite sides of the hard disk 20. The bracket 91 is shown as a cuboid housing. The vibration dampers 51 and 74 are fixed by the mounting surfaces 92 and 93 and sleeves 90 and 99 connected to them on the opposite sides of the hard disk 20. The hard disk 20 is held between the vibration dampers 51 and 74 with at least a slight prestress. Bores 66, the edge regions of the mounting surfaces 92 and 93 projecting beyond the vibration dampers 51, 74 or sleeves 90, 99, allow air to flow through the mounting 91, which is designed here as a closed housing, for the purpose of cooling the hard disk surfaces. As illustrated in FIG. 14, the lugs 98 and 97 are asymmetrical in their layer thickness. This enables negative feedback of the horizontal vibrations emanating from the hard disk 20. As illustrated in FIG. 15, through openings 95 and 96 for the power plug 59 and the data plug 58 on the hard disk 20 are provided in the holding surface 92 and the subsequent mounting surface vibration damper 74. The passage opening 95 and 96 are dimensioned such that the plugs 58 and 59 cannot come into contact with the holding surface 92. An extremely effective noise reduction is additionally achieved if the holder 91 is formed by a housing and the resulting slot 84 around the hard disk 20, as already explained in the exemplary embodiment in FIGS. 6 and 7, with a clear distance of λ / 4 from the hard disk 20 is dimensioned. In addition, the now possible partial sound reflection on the two mounting surfaces 92, 93 contributes significantly to the noise reduction. This embodiment with an exclusive air cooling is suitable for hard disks 20 of small and medium power.

16 and 17, the holding of the hard disk 20 in the steamer assembly is modified in that the damper support surface 50 and the damper mounting surface 55 are formed by separate components attached to opposite sides of the hard disk 20. Otherwise, this exemplary embodiment corresponds functionally to the previously described exemplary embodiment, with the vibration dampers 51 and 74, which are designed as molded parts provided with projections 97 and 98, being enclosed directly on the enclosing housing forming the bracket 91. In this respect, the necessary sleeves 90 and 99 are an integral part of the holder 91. In this exemplary embodiment, the holes to be provided for the flow through the holder are accordingly aligned holes 66 and 68 are formed in the damper mounting surface 55 and the damper support surface 50, the respectively adjoining area of the associated vibration damper 51 and 74 and the outer mounting surfaces 92 and 93 of the holding member 91. Through holes 95 and 96 for the power plug 59 and the data plug 58 on the hard disk 20 are provided in the mounting surface 92, the subsequent mounting surface vibration damper 74 and the damper mounting surface 55.

17 with 18 represents a further development of the exemplary embodiment according to FIG. 16, in which the damper support surface 50 and the damper fastening surface 55 are independent components which are fastened on the opposite sides of the holding means 10 consisting of the holding parts 10a, 10b . As already described in connection with FIGS. 6 and 7, the hard disk 20 is also fastened here between the side walls 12, 14 of the bracket 10 with the interposition of an intermediate layer 30. The vibration-damping supports 62, 64 shown in FIGS. 19 and 20 and the torque distributor bridges 61, 63 shown in FIGS. 21 and 22 are also used here, as in the previous exemplary embodiments. If the holder 91 is designed like a housing, the holder 91 forms a shaft 84 around the holder 10. The aligned bores 68 and the shaft 84 now maintain a uniform air flow on the outside of the holder 10, which does not contain air that has already warmed up in the housing 1 is mixed. If the holder 10 is supplemented with cooling fins 85, as shown in FIGS. 6 and 7, a maximum of passive cooling power is achieved within the scope of this invention. It is particularly advantageous that the opposite end faces of the shaft 39 (FIG. 18) provided with bores 66, which in the exemplary embodiment described here are formed by the damper support surface 50 and damper fastening surface 55, on both sides of the shaft 39, from partially reflect the remaining sound pressure emanating from the hard disk 20. Measurements showed that the remaining noise emission is now essentially only determined by the main fan 5. In terms of measurement technology, the development of noise in this exemplary embodiment, with and without operation of the hard disk 20 (provided that no access is made), can hardly be distinguished. It can thus be seen that the shaft 39 dimensioned with λ / 4, in combination with two partially reflecting end faces, results in maximum noise reduction. The same result can be achieved with the exemplary embodiment from FIGS. 6, 7 if an additional end face with bores 66 and passages 95, 96 for the plugs is attached to the front of the bracket 10. It can also be seen that the function of the partial sound reflection is independent of other possible functions of the end faces.

Furthermore, in the exemplary embodiments of the third category explained above, it was found to be particularly advantageous that the support 91 is designed in such a way that its resonance frequencies are above the frequencies of the hard disk 20 that it still achieves, with little or no attenuation. A bracket 91 made of sheet steel with a thickness of 1.5 mm, designed as a housing, was able to best serve this purpose. The unit formed from the hard disk 20 and the inventive configurations in the third category can now e.g. than 5 '/. Inch standard insert. Direct mounting on a mounting surface 3 with aligned bores 66 and 68 is also advantageous. FIGS. 29 to 31 then also show top views of the vibration dampers 51 and 74, which are used as shaped bodies and are used in the above exemplary embodiments and are to be arranged on opposite sides of the hard disk. The vibration dampers 74 and 51 illustrated with FIGS. 30 and 31 can be varied in their contact area, if necessary, by means of a relaxation 94.

The cooling capacity achievable for the hard disk 20 in the exemplary embodiment according to FIGS. 2 and 3 depends on the dimensioning of the heat sink 18, the holder 10 and the configuration of the fans 9 and / or fans 40. Measurements on the dimensions carried out within the scope of the invention yielded a maximum cooling capacity without Fans 9 and 40 of 1.25 KW and with both fans 9 and 40 a cooling capacity of 0 75 K / W in the embodiment according to 6 and 7 (only without fan) a cooling capacity of 0.95 K / W could be determined. In the exemplary embodiment according to FIG. 18, it is even 0.85 K / W. Here it is clear that with exemplary embodiments according to FIGS. 6 and 7 and according to FIG. 18, each hard disk 20 to 20 W input power can be cooled without fan 40 without the risk of exceeding the permissible operating temperature.

It is clear from the above description of the various exemplary embodiments that the holder 10 can be formed in e-parts or in several parts and is not always used for holding the hard disk 20. It can be seen that within the scope of the inventive concept, modifications and developments of the described exemplary embodiments can be implemented, in which the bracket 10 is used only as a heat sink. By definition within the scope of the inventive concept, the damper support surface 50 and the damper mounting surface 55 are either an integral part of the hard disk 20 or separate components which are fixedly connected to the hard disk 20 or separate components which are fixedly connected to a bracket 10 or are integral Components of the Haltemng 10. Further possible modifications and developments of the described embodiments relate, for example, to the geometric shape and design of the vibration dampers 51 and 74. For example, with a corresponding shape, it is possible for the support surface vibration damper 51 and the mounting surface vibration damper 74 as To form partial areas of a vibration damper manufactured as an integral unit. The exemplary embodiment from FIGS. 12, 13 is suitable for this purpose. If one considers the arrangement shown there in a top view, the vibration dampers 51 and 74 could be brought together in part above and below the damper support surface 50 integrated in the holding device 10 . The vibration damper manufactured as an integral unit thus contains a slot at the height of the holding element 10. This vibration damper is then drawn onto the damper support surface 50 via one of the two side walls 12, 14. In position there, the vibration damper manufactured as an integral unit is functionally subdivided into a vibration damper 51 and 74 by the damper support surface 50.

REFERENCE SIGN LIST 55

1 housing 50 damper support surface

2 Framework 51 support surface vibration damper

3 Holding surface 60 52 stiffening plate

4 base plate 53 power supply

5 main fan 54 rivet 6 rear wall 55 damper mounting surface

7 outlet protector 56 screw

8 Housing cover 65 57 screw

9 additional fan 58 data connector

10 Bracket 59 Power connector LOA bracket control 60 Heat conductor 10B bracket section 61 Torque distributor bridge

11 fastening screw 70 62 anti-vibration pad

12 side wall 63 torque distributor bridge

13 fastening screw 64 anti-vibration pad 14 side wall 65 fan fastening

15 fixing screw 66 hole

16 Manhole base 75 67 Fan attachment

17 fixing screw 68 hole

18 heat sink 69 rivet 19 fastening screw 70 torque compensation plate

20 Hard disk 71 Bracket mounting edge

21 Fastening screw 80 72 Bracket fastening edge

22 rivets 73 bracket mounting edge

23 mounting 74 mounting surface- 24 rivet vibration damper

25 attachment 75 tuning plate

26 rivets 85 76 set screw

27 Fastening 77 threaded attachment

28 rivets 78 hard disk top 29 cage 79 legs

30 anti-vibration intermediate layer 80 legs

31 compensation holes 90 81 legs

33 front panel 82 legs

34 Bohmng 83 gap 35 Bohmng 84 shaft

36 drive threads 85 cooling fins

37 Central attachment 95 88 thread

38 thread 89 through opening

39 slot 90 sleeve 40 hard drive fan 91 bracket

41 fan through openings 92 holding surface

42 fan through openings 100 93 mounting surface

43 Composite plate 94 Ausspamng

44 seal 95 through opening 45 floppy drive 96 through opening

46 Composite panel 97 approach

47 Composite panel 105 98 approach

48 composite panel 99 sleeve

49 Composite panel

Claims

P a t e n t a n s r u c h e

1. Housing (1) for receiving electronic assemblies and motor-driven units in which one or more hard disk (s) (20) or other, each having at least one drive motor assembly (s) is or are, characterized in that in addition to more suitable Fasteners for holding the hard drive (s) (20) one

Damper support surface (50), a damper mounting surface (55), in each case at least one support surface vibration damper (51), em mounting surface vibration damper

(74) and a holding surface (3) are provided that the damper support surface (50) and the damper mounting surface (55) are assigned to one side of the hard disk (20) and two opposite sides of a suitable holding surface (3) that at least one carrier surface vibration damper (51) between the damper

Carrier surface (50) and the holding surface (3) is arranged and with at least one contact surface on the damper support surface (50) and the holding surface (3), at least partially flat and that at least em mounting surface vibration damper (74) between the Damper mounting surface (55) and the Haltemngsfläche (3) is arranged and with at least one contact surface on the damper mounting surface (55) and

Haltemngsfläche (3), at least partially flat.

2. Housing according to Anspmch 1, characterized in that the damper support surface (50) and the damper mounting surface (55) are held at such a distance by the fastening elements that the carrier surface vibration damper (51) and the mounting surface vibration damper (74 ) are under at least a slight pressure preload. 3. Housing (1) for receiving electronic assemblies and motor-driven units, which one or more hard disk (s) (20) or other, each having at least one drive motor assembly (s) is or are characterized, characterized in that in addition to suitable fasteners , for the mounting of the hard disk (s) (20) a damper support surface (50), a damper mounting surface (55), in each case at least e

Carrier surface vibration damper (51), mounting surface vibration damper (74) and a Haltemngsgsfläche (3) are provided that the damper support surface (50) and the damper mounting surface (55) one side of the hard disk (20) and one side of a Suitable mounting surface (3) are assigned that at least e support surface vibration damper (51) between the damper

Carrier surface (50) and the holding surface (3) is arranged and with at least one contact surface on the damper carrier surface (50) and the holding surface (3), at least partially flat and that at least em mounting surface vibration damper (74) between the Damper mounting surface (55) and the damper support surface (50) is arranged and with at least one contact surface on the damper mounting surface (55) and the damper support surface (50), at least partially flat.

4. Housing according to Anspmch 3, characterized in that Haltemngsfläche (3) and the damper mounting surface (55) are held by the fastening elements m such a distance that the support surface vibration damper (51) and the mounting surface vibration damper (74) at least with a slight prestress. 5. Housing according to Anspmch 1 or 3, characterized in that the damper support surface (50) is an integral part of one side of the hard disk (20).

6. Housing according to Anspmch 1 or 3, characterized in that the damper support surface (50) is a separate component which is firmly connected to one side of the hard disk (20).

7. Housing according to Anspmch 1 or 3, characterized in that the hard disk (20) is assigned a Haltemng (10) that the damper support surface (50) is a separate component and is firmly connected to one side of the holder (10) and that the hard disk (20) between the side walls (12, 14) of the Haltemng (10) is attached.

8. Housing according to one of claims 1 to 7, characterized in that the shaft of each of the fastening elements designed as fastening screws (23, 25, 27) is insulated and longitudinally displaceable through the associated ^) hole (s) in the plate arranged between the outer plates ( n) is performed.

9. Housing according to one of claims 1 to 8, characterized by means for changing the pressure bias of the support surface vibration damper (51) and

Mounting surface vibration damper (74).

10. Housing according to Anspmch 9, characterized in that between the damper support surface (50) and the support surface vibration damper (51) or the damper mounting surface (55) and the mounting surface vibration damper (74) lie flat against the respective subsequent vibration damper Tuning plate (75) is provided, and that a feed device is provided which engages on the carrier or damper fastening surface on the one hand and the tuning plate on the other hand, by means of which the tuning plate (75) away from the associated carrier or damper fastening surface in the direction of the vibration damper is adjustable.

11. Housing according to one of claims 1 to 10, characterized in that recesses or holes (31) are provided in the carrier surfaces - vibration damper (51) and in the mounting surface vibration damper (74) in each case in such a way that the of the Haltemng ( 10) and the hard disk (20) formed disk unit according to their

Mounting in the housing is oriented essentially at right angles to the front plate (33).

12. Housing (1) for receiving electronic assemblies and motor-driven units, in which one or more hard disk (s) (20) or other, each having at least one drive motor assembly (s) is or are, characterized in that in addition to more suitable Fastening means for holding the hard disk (s) (20) a damper carrier surface (50), a damper fastening surface (55), in each case at least one carrier surface vibration damper (51), one fastening surface vibration damper (74) and two opposite one another lying mounting surfaces (92, 93) are provided that the damper support surface (50) and the damper mounting surface (55) are assigned to two opposite sides of the hard disk (20) and the two opposite mounting surfaces (92, 93), that at least em carrier surface vibration damper (51) between the damper carrier surface (50) and the mounting surface (93) is arranged and with at least one contact surface on the damper support surface (50) and the mounting surface (93), at least partially flat, and that at least one mounting surface vibration damper (74) between the damper mounting surface (55) and the mounting surface ( 92) is arranged and with at least one contact surface on the damper mounting surface (55) and the

Haltemngsfläche (92), at least partially flat.

13. Housing according to Anspmch 12, characterized in that the carrier surface vibration damper (51) and the fastening surface vibration damper (74) are formed as molded parts with projections (97, 98) each emerging from their edge region.

14. Housing according to Anspmch 12 and 13, characterized in that the holding surface (92) and the holding surface (93) are held at such a distance by a retaining ring (91) that the carrier surface vibration damper (51) enclosed in a sleeve (99) ) and the mounting surface vibration damper (74) enclosed in a cuff (90) are under at least a slight compressive prestress and the clear internal dimension of the

Damper support surface (50) and damper mounting surface (55) enclosing lugs (97, 98) on all sides is dimensioned such that the lugs (97, 98) are under at least a slight compressive prestress. 15. Housing according to one of claims 12 to 14, characterized in that the damper support surface (50) and / or the damper mounting surface (55) are each an integral part of one of two opposite sides of the hard disk (20).

16. Housing according to one of claims 12 to 14, characterized in that the damper support surface (50) and / or damper mounting surface (55) are separate components and are each attached to one of two opposite sides of the hard disk (20).

17. Housing according to one of claims 12 to 14, characterized in that the damper support surface (50) and the damper mounting surface (55) are separate components and are fixedly attached to two opposite sides of a holder (10), and the hard disk

(20) between the side walls (12, 14) of the Haltemng (10) is attached.

18. Housing according to one of claims 1 to 17, in which the hard disk (20) m a holder (10) is arranged, characterized in that the damper support surface (50) and / or the damper mounting surface (55) are integral components the bracket (10) is or are.

19. Housing according to Anspmch 13 and one of claims 14 to 18, characterized in that the peripheral lugs (97, 98) of the support surface vibration damper (51) and the mounting surface vibration damper (74) the damper support surface (50) and the

Hold the damper mounting surface (55).

20. Housing according to one of claims 1 to 19, characterized in that the carrier surface vibration damper (51) and the mounting surface vibration damper (74) consists of several layers and the individual layers have different properties.

21. Housing according to one of claims 1 to 20, characterized in that the strength and the material properties of the support surface vibration damper (51) and the mounting surface vibration damper (74) are selected so that the damper

Carrier surface (50), the carrier surface vibration damper (51), the mounting surface vibration damper (74) and the damper mounting surface (55) formed damper system in the critical frequency range of the hard disk em essentially under negative feedback oscillating low-pass system.

22. Housing according to one of claims 1 to 21, characterized in that the carrier surface vibration damper (51) and the mounting surface vibration damper (74) are partial areas of a vibration damper designed as an integral unit. 23. Housing (1) for receiving electronic assemblies and motor-driven units in which one or more hard disk (s) (20) or other, each having at least one drive motor assembly (s) is or are, characterized in that a hard disk (20) a holder (10) is assigned that a vibration-damping intermediate layer (30) is provided between a hard disk (20) and the associated holder (10), that the vibration-damping intermediate layer (30) additionally has good thermal conductivity, that the intermediate layer (30) has at least one large-area contact with at least two long sides of the hard disk (20) and one large-area contact with at least two side walls (12, 14) of the retaining ring (10 ) has that the holder (s) (10) is or are made of a good heat-conducting material and that at least parts of the surfaces of the holding rod (10) are exposed to the air circulation prevailing in the housing.

24 Housing according spoke 23, characterized in that the vibration-damping intermediate layer (30) is made of an elastically deformable material.

25 housing according spoke 23 or 24, characterized in that the vibration-damping intermediate layer (30) is formed by a Bandmateπal.

26. Housing according spoke 23, characterized in that the vibration-damping intermediate layer (30) is formed by at least one coating applied to the inside of the side walls (12, 14) of the retaining member (10).

27. Housing according to one of claims 23 to 26, characterized in that the intermediate layer (30) is arranged under sufficient contact pressure to ensure the surface contact between the long sides of the hard disk (20) and the side walls (12, 14) of the Haltemng (10) .

28. Housing according to one of claims 23 to 27, characterized in that at least two heat transfers are provided between the hard disk (20) and the Haltemng (10) via the intermediate layer (30) on the respective mounting sides. 29 Housing according to one of claims 23 to 28, characterized in that on the holder (10) at least em with cooling fins (85) provided cooling body (18) is well heat-conducting and that the cooling fins (85) of the heat sink (18) at least partially into the cooling air flow generated by a main fan (5) in the housing (1). 30. Housing according to one of claims 23 to 29, characterized in that the holder (10) itself is designed as a heat sink.

31 Housing according spoke 30, characterized in that the holder (10) is provided with integral cooling fins (85).

32. Housing (1) for receiving electronic assemblies and motor-driven units, in which one or more hard disk (s) (20) or other, each having at least one drive motor assembly (s) is or are, characterized in that the hard disk (20) a holder (10) is assigned that the holding ring (10) forms a shaft (39) around the hard disk (20), which runs at least over the top (78) and the underside of the hard disk (20), that the the holding ring (10) forming the shaft (39), which is designed in such a way that its resonance frequencies are above the highest undamped frequencies still reached by the hard disk (20), that the clear distance between the inner sides of the shaft (39), at least to the upper side ( 78) and to the underside of the hard disk (20), a distance of λ 14 of the highest acoustically relevant frequency to be expected does not exceed that at least on the holding ring (10) on one side of the shaft (39) there is an at least partially reflective end surface provided with Bohmngen (66) and,

REPLACEMENT BLADE (RULE 26) that at least the top (78), the bottom of the hard disk (20) and the inside of the shaft (39) are exposed to the air circulation prevailing in the housing (1).

33. Housing according to claim 32, characterized in that the end surface is formed by a damper support surface (50).

34 housing according spoke 32, characterized in that on the holder (10) on both sides of the shaft (39) each with a bore (66) provided, at least partially reflective end surface is provided.

35 housing (1) for receiving electronic assemblies and motor-driven units, in which one or more hard disk (s) (20) or other, each having at least one drive motor assembly (s) is or are held, characterized in that the hard disk ( 20) a holder (91) is assigned that the Haltemng (91) forms a shaft (84) around the hard drive (20), which runs at least over the top (78) and the underside of the hard drive (20) that the Shaft (84) forming retaining ring (91), which is designed in such a way that its resonance frequencies are above the highest undamped frequencies they still reach from the hard disk (20), that the clear distance between the inside of the shaft (84), at least to the top (78 ) and the underside of the hard disk (20), a distance of λ 14 of the highest acoustically relevant frequency to be expected does not exceed that on the holding ring (91) on two ge opposite sides of the shaft (84) each have a, provided with holes (66), at least partially reflective end face and that at least the top (78), the underside of the hard disk (20) and the inside of the shaft (84) of the in Housing (1) are exposed to the prevailing air circulation 36 housings according to spoke 35, characterized in that the end faces are formed by the mounting surfaces (92, 93).

37 housing according to one of claims 1 to 36, characterized in that in the, the damper and Haltemng system of the hard disk (20) forming, aligned holes (66, 68) are provided, which at least part of the Luftemiasses for the ms housing (1) Form intake air.

38. Housing according to one of claims 1 to 37, in which the hard disk (20) is arranged in a holder (10), characterized in that the holding rod (10) is constructed in several parts and consists of at least two holder parts (10A, 10B) .

39. Housing according to one of claims 1 to 38, in which the hard disk (20) is arranged in a holding member (10), characterized in that the hard disk (20) by means of fastening screws (11, 13, 15, 17) engaging in it. 19, 21) is supported, which are supported on the side walls (12, 14) of the holder (10) via torque distributor bridges (61, 63) and vibration-damping documents (62, 64).

40 Housing according to one of claims 1 to 39, characterized in that the mounting surface (3) is part of the front plate 33 and the front plate 33 is stabilized at least in the region of the mounting surface (3).