EP2302293B1 - Automotive headlamps comprising a venting pipe - Google Patents

Automotive headlamps comprising a venting pipe Download PDF

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Publication number
EP2302293B1
EP2302293B1 EP10179136.6A EP10179136A EP2302293B1 EP 2302293 B1 EP2302293 B1 EP 2302293B1 EP 10179136 A EP10179136 A EP 10179136A EP 2302293 B1 EP2302293 B1 EP 2302293B1
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EP
European Patent Office
Prior art keywords
pipe
motor vehicle
lighting
conduit
ventilation
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EP10179136.6A
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German (de)
French (fr)
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EP2302293A1 (en
EP2302293B2 (en
Inventor
Christine Roucoules
Sébastien PETIT
Jean-Claude Puente
Christophe Cros
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Valeo Vision SAS
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Valeo Vision SAS
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Publication of EP2302293A1 publication Critical patent/EP2302293A1/en
Publication of EP2302293B1 publication Critical patent/EP2302293B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/30—Fog lights

Definitions

  • the present invention relates to a lighting and / or signaling device of a motor vehicle. It also relates to a vehicle equipped with such a lighting device and / or signaling.
  • Some devices are vented with baffle or labyrinth openings (as described for example in the documents FR 2,738,782 , FR 2,660,413 , FR 2,639,010 ) or with openings with membrane filters or with fine pipes.
  • the document FR 2923891 also shows a technical solution of ventilation.
  • Fine pipe solutions have limited ventilation efficiency due to small sections and the length of the pipes generating high pressure drops. They have the disadvantage of not prohibiting entries of water or dust.
  • the object of the invention is to provide a lighting and / or signaling device for a motor vehicle to overcome the problem mentioned above and improving the known devices of the prior art.
  • the invention provides a lighting and / or signaling device for a single motor vehicle, to ensure good ventilation with fresh air and dry while prohibiting the entry of water and dust in the device.
  • the lighting and / or signaling device for a motor vehicle comprises an enclosure formed by a housing and an ice, an opening being made in the enclosure. It comprises an air duct extending from the opening, the air duct being closed by a filter means impervious to liquids and dust and permeable to gases.
  • the pipe thus makes it possible to collect fresh gases at a distance from the enclosure of the device while preventing dust or liquid from entering the enclosure.
  • the length of the pipe is for example greater than 2 cm.
  • the reference value of pipe length is 15 cm.
  • the filter means may be glued into the pipe or at a free end of the pipe.
  • the filtering means can also be glued at an opening of the pipe.
  • the filtering means may also be an overmolded part between two parts of the pipe, for example by being of cylindrical shape. Thus, the filtering means can be set up simply.
  • the filtering means may be a membrane, in particular a textile membrane, for example a membrane based on PTFE (or equivalent material) to guarantee fluid impermeability. It must also be impervious to dust without clogging to ensure air permeability throughout the life of the vehicle.
  • PTFE or equivalent material
  • the pipe can be fixed to the housing by pinching or welding or clipping.
  • the device may comprise a plurality of openings in the housing and from each of which extends a ventilation duct.
  • the areas of the straight sections of each of the pipes and / or the filtering means are reduced relative to the area of the cross section of the pipe and / or the filtering means of a device according to the invention not comprising only one conduct.
  • the pipe may include an anti-runoff means.
  • an anti-trickling means makes it possible for the liquid water not to come into contact with the filtering means.
  • the motor vehicle is characterized in that it comprises a lighting and / or signaling device defined above.
  • a free end of the air duct can be positioned at a place where the pressure varies according to the driving characteristics of the motor vehicle. These variations of pressure can promote gas exchange between the interior of the enclosure and the outside environment.
  • the attached drawing shows, by way of example, an embodiment of a lighting and / or signaling device for a motor vehicle according to the invention.
  • the figure 1 is a diagram of a longitudinal and vertical section of an embodiment of a lighting and / or signaling device for a motor vehicle according to the invention.
  • the lighting and / or signaling device comprises an aeration or ventilation duct making it possible to remove, at a distance from the chamber of the device, the place where the ventilation air of this chamber is taken. .
  • the section of the pipe is adapted according to the length of the pipe to limit the pressure drops.
  • a filtering means of the pipe can be added, as well as possibly protection against the runoff of water to prevent the accumulation of water on the membrane.
  • a device 1 for lighting and / or signaling a motor vehicle shown schematically in section at the figure 1 , mainly comprises an enclosure 9 and a duct 10 aeration or ventilation of this enclosure.
  • the enclosure is mainly constituted by a housing 2, optionally forming or containing an optical mirror, and a transparent closure glass 3.
  • the enclosure contains a light source 4 such as in particular a light bulb, a halogen lamp or one or more light-emitting diodes .
  • a passage provided by a opening 8 which is made in the housing the enclosure is waterproof. This opening allows the pressure balance of the gases in the enclosure of the lighting and / or signaling device and in the external environment.
  • the opening is made in a lower part of the housing, that is to say in the bottom of the housing or in the lower part of a side wall of the housing.
  • the ventilation duct is connected to the housing at the opening 8 by a first end 11.
  • the ventilation duct also comprises a second free end 12.
  • the ventilation duct mainly comprises a pipe 5 and a filtering means 6 of this pipe.
  • the pipe may be made of any material, however it is preferably made of flexible or rigid plastic material, for example EPDM (ethylene propylene diene monomer).
  • EPDM ethylene propylene diene monomer
  • the pipe has a circular section, including a circular internal section. However, it may have any other form of section.
  • the filter medium is also made of any material, provided that it is impermeable to liquids and dust and permeable to gases throughout the life of the product. It consists for example of a membrane, for example made by a textile fabric or PTFE having these properties.
  • the membrane is preferably glued in the pipe or on the pipe. It can be overmolded with the pipe in the form to ensure the largest possible exchange surface. It can be maintained on a structure in the form of mesh to stiffen according to the surface involved.
  • the membrane can be replaced by any component that diffuses moisture well and prevents water ingress, dust or any impurity.
  • the membrane can be positioned anywhere, especially on the pipe, inside the pipe or at the end of the pipe.
  • the diffusion rate per unit of time is a function of the surface of the membrane and the nature of the permeability of the membrane.
  • the slope characterizing the evolution of the diffusion rate as a function of the surface by assuming a linear variation is between 0.001 mm -2 .h -1 and 0.01 mm -2 .h -1 , with a typical value for a certain type of membrane of 0.002 mm -2 .h -1 .
  • the surface of the membrane is to be adapted depending on the type of membrane (including its permeability) and the diffusion rate that is desired to achieve.
  • the dimensions of the ventilation duct are determined according to the lighting and / or signaling device, in particular according to the volume of the enclosure of the device.
  • the area S of the cross section of the pipe is a function of its length L and / or the different bends it may have along its length. Indeed, the longer the pipe and / or its path is tortuous, the greater the area of the cross section of the pipe must be important to limit the pressure losses in the ventilation pipe that are likely to limit trade gas between the enclosure of the device and the external environment.
  • the area of the membrane must be adapted so as not to limit the gas exchange between the chamber and the external environment.
  • the area of the membrane may be different from, in particular greater than, the area of the cross section of the pipe.
  • the pipe may have at the level of the membrane an area of cross section different from the area of its cross section to another level.
  • the membrane may not be disposed along a straight section of the pipe but at an angle to it and / or extend along a non-planar surface, in order to maximize the surface of the membrane in a pipe of given dimensions.
  • the area of the internal section of the pipe is for example between 7 mm 2 and 700 mm 2 or, for a pipe with a circular inner section, a diameter of between 3 mm and 30 mm and preferably between 38 mm 2 and 320 mm 2 is, for a circular inner section pipe, a diameter of between 7 mm and 20 mm.
  • the area of the membrane may have the same characteristics.
  • the area of the internal section of the pipe is for example less than 80 mm 2 is for a circular inner cross-section pipe, diameter less than 10 mm and preferably between 12 mm 2 and 40 mm 2 is, for a pipe with circular inner section, a diameter of between 4 mm and 7 mm.
  • the area of the membrane may have the same characteristics.
  • the area of the internal section of the pipe is, for example, less than 180 mm 2 or, for a pipe with a circular inner section, a smaller diameter. to 15 mm and preferably between 12 mm 2 and 80 mm 2 is, for a circular inner section pipe, a diameter of between 4 mm and 10 mm.
  • the area of the membrane may have the same characteristics.
  • the pipe preferably extends vertically downwards or substantially vertically downwards from the enclosure.
  • the aeration duct comprises a pipe having a length and a conformation so that its free end 12 can be positioned at a wing of the motor vehicle, at the level of the calender of the motor vehicle, especially at the level of a ventilation mouth of the engine compartment, the mouth being located at the front grille of the motor vehicle, or in front of the lighting and / or signaling device.
  • these zones are not close to the enclosure of the lighting and / or signaling device and the pipe thus has a length at least greater than 2 cm and, preferably greater than 15 cm, (the value of reference being 15 cm).
  • the vent pipe may have a run-off cover 7. It prevents runoff of water or other liquids along the pipe to the free end thereof where the membrane is located .
  • This run-off cover can be made of any material and can be made in any shape that prevents water from dripping onto the membrane.
  • the anti-dripping cover may be made of plastic, be fixed in the lower part of the pipe directly on the latter and have a flaring shape downwards, especially a frustoconical shape.
  • no run-off cover is necessary: indeed, it is free end itself of the pipe which, in combination with the position of the membrane higher up the pipe, prevents the water from rising up to the membrane.
  • the filtering means is the only interface allowing gas exchange between the enclosure 9 and the external environment.
  • the lighting and / or signaling device may comprise several openings 8 to which a plurality of ventilation ducts 10 are connected.
  • the ventilation device that constitutes the opening 8 and the ventilation duct 10 are very simple to make compared to the baffle or labyrinth solutions known from the prior art.
  • the length of the ventilation duct makes it possible, as we have seen, to position its free end in a location chosen and adapted to solve the problems mentioned above. It allows in particular to position the free end of the air duct at a place where the pressure varies according to the driving characteristics of the motor vehicle.
  • these pressure variations make it possible to promote gas exchanges between the interior of the enclosure 9 and the external environment by alternating pressures and depressions of the external medium relative to the interior of the enclosure.
  • These pressures and depressions create, in the event of a moisture level in the upper chamber at the moisture level at the free end of the pipe, the flow of wet gas out of the enclosure and dry gas flows into the enclosure.
  • the pipe 5 may be one made in several parts. For example, it can be made in a rigid upper part which is fixed at the level of the opening 8 and in a flexible lower part overmolded on the upper part and provided with the membrane. Alternatively, the pipe may be made in three parts: a flexible upper portion being fixed at the opening 8, a rigid intermediate portion on which is overmoulded the upper part and a flexible lower part overmolded on the intermediate portion and provided with the membrane.
  • the filtering means can in these two cases be fixed at the level of the flexible lower part.
  • the end of the pipe is disposed at a dry and dust-free compartment of the vehicle, for example the passenger compartment of the vehicle or a particular compartment inside this cabin, it is possible to do without filter medium.
  • the invention applies to different signaling lighting devices, including a front projector of a motor vehicle, a fog lamp for a motor vehicle and a signaling light of a motor vehicle.
  • the lighting and / or signaling device may be a front lighting and / or signaling device or a rear lighting and / or signaling device.

Description

La présente invention se rapporte à un dispositif d'éclairage et/ou de signalisation d'un véhicule automobile. Elle porte également sur un véhicule équipé d'un tel dispositif d'éclairage et/ou de signalisation.The present invention relates to a lighting and / or signaling device of a motor vehicle. It also relates to a vehicle equipped with such a lighting device and / or signaling.

Il est connu de ventiler les dispositifs d'éclairage et/ou de signalisation pour véhicule automobile. En effet, cette ventilation permet d'équilibrer la pression des gaz entre l'intérieur et l'extérieur du dispositif d'éclairage et/ou de signalisation. En effet, en fonctionnement, les dispositifs d'éclairage et/ou de signalisation chauffent et les gaz qu'ils contiennent se comprimeraient en l'absence de ventilation. La ventilation permet donc leur dilatation.It is known to ventilate the lighting and / or signaling devices for a motor vehicle. Indeed, this ventilation makes it possible to balance the pressure of the gases between the inside and the outside of the lighting and / or signaling device. Indeed, in operation, the lighting and / or signaling devices heat up and the gases they contain would compress in the absence of ventilation. Ventilation therefore allows their expansion.

La présence de ventilation pose un problème d'entrée d'humidité dans les dispositifs d'éclairage et/ou de signalisation et, par conséquent un problème de condensation. Ce problème de condensation est principalement rencontré dans des compartiments moteurs chauds de véhicules automobiles présentant des dispositifs d'éclairage et/ou de signalisation dont les sources lumineuses dégagent beaucoup de chaleur notamment les lampes halogènes ou les lampes Xenon, ainsi que les sources lumineuses dites « à lumière froide », telles que les sources à diodes électroluminescentes, dont l'élément semi-conducteur dégage beaucoup moins de chaleur que les sources halogènes ou Xenon. Ces sources lumineuses froides présentent l'avantage d'une faible consommation. La glace, en fonction de sa forme, présente des zones froides d'autant plus grandes que les sources chauffent moins la glace. Dans les zones où la température de la glace du dispositif est relativement froide, le risque de condensation au niveau de la glace de fermeture du dispositif d'éclairage et/ou de signalisation est élevé. Ce risque est encore plus grand avec les sources lumineuses à élément semi-conducteur, car bien que ce dernier chauffe, le faisceau lumineux contient quant à lui peu de rayons infrarouges et la glace n'est quasiment pas chauffée par l'éclairage, comparativement à d'autres sources, telles que des lampes à filament. Pour éliminer la condensation, il faut éviter l'entrée d'humidité dans le dispositif d'éclairage et/ou de signalisation et favoriser son évaporation.The presence of ventilation poses a problem of entry of moisture into the lighting and / or signaling devices and, consequently, a problem of condensation. This problem of condensation is mainly encountered in hot engine compartments of motor vehicles having lighting and / or signaling devices whose light sources give off a lot of heat including halogen lamps or Xenon lamps, as well as light sources called " such as light-emitting diode sources, whose semiconductor element emits much less heat than halogen or Xenon sources. These cold light sources have the advantage of low consumption. Ice, depending on its shape, has colder areas that are larger as the sources heat the ice less. In areas where the ice temperature of the device is relatively cold, the risk of condensation at the closing glass of the lighting device and / or signaling is high. This risk is even greater with light sources with semiconductor element, because although the latter When it is heated, the light beam contains few infrared rays and the ice is hardly heated by the lighting compared to other sources, such as filament lamps. To eliminate condensation, it is necessary to avoid the entry of moisture into the lighting and / or signaling device and to promote its evaporation.

Il existe diverses solutions pour résoudre ce problème d'entrée d'humidité. Certains dispositifs sont ventilés avec des ouvertures à chicanes ou à labyrinthes (comme décrit par exemple dans les documents FR 2 738 782 , FR 2 660 413 , FR 2 639 010 ) ou avec des ouvertures munies de membranes filtrantes ou avec des tuyaux fins.There are various solutions to solve this problem of moisture entry. Some devices are vented with baffle or labyrinth openings (as described for example in the documents FR 2,738,782 , FR 2,660,413 , FR 2,639,010 ) or with openings with membrane filters or with fine pipes.

Le document FR 2923891 montre également une solution technique de ventilation.The document FR 2923891 also shows a technical solution of ventilation.

Les solutions à chicanes ou à labyrinthes présentent des inconvénients. Elles ont des formes de tailles limitées permettant de ventiler le projecteur uniquement dans une zone limitée. Ces solutions permettent de limiter les entrées d'eau liquide mais restent accolées aux dispositifs d'éclairage et/ou de signalisation, ce qui fait qu'elles ne les ventilent qu'avec de l'air chaud et humide pris dans le compartiment moteur. De plus, ces solutions ne permettent pas de filtrer les poussières.Solutions with baffles or labyrinths have disadvantages. They have limited size shapes to ventilate the projector only in a limited area. These solutions make it possible to limit the inflow of liquid water but remain contiguous to the lighting and / or signaling devices, so that they only ventilate them with hot, moist air taken from the engine compartment. In addition, these solutions do not allow to filter the dust.

Les solutions à tuyau fin ont une efficacité de ventilation limitée du fait de faibles sections et de la longueur des tuyaux générant de fortes pertes de charge. Elles présentent l'inconvénient de ne pas interdire des entrées d'eau ou de poussières.Fine pipe solutions have limited ventilation efficiency due to small sections and the length of the pipes generating high pressure drops. They have the disadvantage of not prohibiting entries of water or dust.

D'autres dispositifs sont munis de systèmes de dessiccation (comme décrit par exemple dans le document US6,422,729 ).Other devices are provided with drying systems (as described for example in the document US6,422,729 ).

Le but de l'invention est de fournir un dispositif d'éclairage et/ou de signalisation pour véhicule automobile permettant de remédier au problème évoqué précédemment et améliorant les dispositifs connus de l'art antérieur.The object of the invention is to provide a lighting and / or signaling device for a motor vehicle to overcome the problem mentioned above and improving the known devices of the prior art.

En particulier, l'invention propose un dispositif d'éclairage et/ou de signalisation pour véhicule automobile simple, permettant d'assurer une bonne ventilation avec de l'air frais et sec tout en interdisant l'entrée d'eau et de poussières dans le dispositif.In particular, the invention provides a lighting and / or signaling device for a single motor vehicle, to ensure good ventilation with fresh air and dry while prohibiting the entry of water and dust in the device.

Selon l'invention, le dispositif d'éclairage et/ou de signalisation pour véhicule automobile comprend une enceinte formée par un boîtier et une glace, une ouverture étant pratiquée dans l'enceinte. Il comprend une conduite d'aération s'étendant depuis l'ouverture, la conduite d'aération étant obturée par un moyen filtrant imperméable aux liquides et aux poussières et perméable aux gaz. La conduite permet ainsi de collecter des gaz frais à distance de l'enceinte du dispositif tout en évitant que des poussières ou un liquide pénètrent dans l'enceinte.According to the invention, the lighting and / or signaling device for a motor vehicle comprises an enclosure formed by a housing and an ice, an opening being made in the enclosure. It comprises an air duct extending from the opening, the air duct being closed by a filter means impervious to liquids and dust and permeable to gases. The pipe thus makes it possible to collect fresh gases at a distance from the enclosure of the device while preventing dust or liquid from entering the enclosure.

La longueur de la conduite est par exemple supérieure à 2 cm. La valeur de référence de longueur de la conduite est 15 cm.The length of the pipe is for example greater than 2 cm. The reference value of pipe length is 15 cm.

Le moyen filtrant peut être collé dans la conduite ou à une extrémité libre de la conduite. Le moyen filtrant peut aussi être collé au niveau d'une ouverture de la conduite. Le moyen filtrant peut encore être une partie surmoulée entre deux parties de la conduite, par exemple en étant de forme cylindrique. Ainsi, le moyen filtrant peut être mis en place simplement.The filter means may be glued into the pipe or at a free end of the pipe. The filtering means can also be glued at an opening of the pipe. The filtering means may also be an overmolded part between two parts of the pipe, for example by being of cylindrical shape. Thus, the filtering means can be set up simply.

Le moyen filtrant peut être une membrane notamment une membrane textile, par exemple une membrane à base de PTFE (ou matériau équivalent) pour garantir l'imperméabilité aux fluides. Elle doit aussi être imperméable à la poussière sans se boucher pour garantir perméabilité à l'air tout au long de la durée de vie du véhicule.The filtering means may be a membrane, in particular a textile membrane, for example a membrane based on PTFE (or equivalent material) to guarantee fluid impermeability. It must also be impervious to dust without clogging to ensure air permeability throughout the life of the vehicle.

La conduite peut être fixée au boîtier par pincement ou soudage ou clippage. Ces solutions permettent une réalisation simple du dispositif selon l'invention tout en assurant une étanchéité au niveau de cette fixation.The pipe can be fixed to the housing by pinching or welding or clipping. These solutions allow a simple realization of the device according to the invention while ensuring a seal at this attachment.

Le dispositif peut comprendre plusieurs ouvertures pratiquées dans le boîtier et à partir de chacune desquelles s'étend une conduite d'aération. Dans ce cas, les aires des sections droites de chacune des conduites et/ou des moyens filtrants sont réduites par rapport à l'aire de la section droite de la conduite et/ou du moyen filtrant d'un dispositif selon l'invention ne comportant qu'une seule conduite.The device may comprise a plurality of openings in the housing and from each of which extends a ventilation duct. In this case, the areas of the straight sections of each of the pipes and / or the filtering means are reduced relative to the area of the cross section of the pipe and / or the filtering means of a device according to the invention not comprising only one conduct.

La conduite peut comprendre un moyen anti-ruissellement. Un tel moyen anti-ruissellement permet que l'eau liquide ne soit pas en contact avec le moyen filtrant.The pipe may include an anti-runoff means. Such an anti-trickling means makes it possible for the liquid water not to come into contact with the filtering means.

Selon l'invention, le véhicule automobile est caractérisé en ce qu'il comprend un dispositif d'éclairage et/ou de signalisation défini précédemment.According to the invention, the motor vehicle is characterized in that it comprises a lighting and / or signaling device defined above.

De préférence, une extrémité libre de la conduite d'aération est positionnée au niveau :

  • d'une calandre du véhicule automobile, notamment au niveau d'une bouche de ventilation du compartiment moteur, ou
  • d'une aile du véhicule automobile, ou
  • en face avant du dispositif d'éclairage et/ou de signalisation.
Preferably, a free end of the ventilation duct is positioned at the level:
  • a radiator grille of the motor vehicle, in particular at the level of a ventilation opening of the engine compartment, or
  • a wing of the motor vehicle, or
  • on the front face of the lighting and / or signaling device.

Au niveau de ces zones, on trouve de l'air frais et sec permettant de ventiler efficacement l'enceinte pour en évacuer l'humidité.In these areas, there is fresh and dry air to effectively ventilate the enclosure to remove moisture.

Notamment, une extrémité libre de la conduite d'aération peut être positionnée au niveau d'un endroit où la pression varie en fonction des caractéristiques de roulage du véhicule automobile. Ces variations de pression permettent de favoriser les échanges gazeux entre l'intérieur de l'enceinte et le milieu extérieur.In particular, a free end of the air duct can be positioned at a place where the pressure varies according to the driving characteristics of the motor vehicle. These variations of pressure can promote gas exchange between the interior of the enclosure and the outside environment.

Le dessin annexé représente, à titre d'exemple, un mode de réalisation d'un dispositif d'éclairage et/ou de signalisation pour véhicule automobile selon l'invention.The attached drawing shows, by way of example, an embodiment of a lighting and / or signaling device for a motor vehicle according to the invention.

La figure 1 est un schéma d'une section longitudinale et verticale d'un mode de réalisation d'un dispositif d'éclairage et/ou de signalisation pour véhicule automobile selon l'invention.The figure 1 is a diagram of a longitudinal and vertical section of an embodiment of a lighting and / or signaling device for a motor vehicle according to the invention.

Selon l'invention, le dispositif d'éclairage et/ou de signalisation comprend une conduite d'aération ou de ventilation permettant de déporter, à distance de l'enceinte du dispositif, le lieu où est pris l'air de ventilation de cette enceinte. Ainsi, il est possible d'utiliser de l'air plus frais et plus sec. La section de la conduite est adaptée en fonction de la longueur de la conduite pour limiter les pertes de charge. Par ailleurs, pour éviter l'entrée de poussières et d'eau, un moyen filtrant de la conduite peut être ajoutée, ainsi qu'éventuellement une protection contre le ruissellement de l'eau pour éviter l'accumulation d'eau sur la membrane.According to the invention, the lighting and / or signaling device comprises an aeration or ventilation duct making it possible to remove, at a distance from the chamber of the device, the place where the ventilation air of this chamber is taken. . Thus, it is possible to use cooler and drier air. The section of the pipe is adapted according to the length of the pipe to limit the pressure drops. Furthermore, to prevent the entry of dust and water, a filtering means of the pipe can be added, as well as possibly protection against the runoff of water to prevent the accumulation of water on the membrane.

Un dispositif 1 d'éclairage et/ou de signalisation d'un véhicule automobile, représenté schématiquement en section à la figure 1, comprend principalement une enceinte 9 et une conduite 10 d'aération ou de ventilation de cette enceinte.A device 1 for lighting and / or signaling a motor vehicle, shown schematically in section at the figure 1 , mainly comprises an enclosure 9 and a duct 10 aeration or ventilation of this enclosure.

L'enceinte est principalement constituée par un boîtier 2, formant éventuellement ou contenant un miroir optique, et une glace transparente de fermeture 3. L'enceinte renferme une source lumineuse 4 comme notamment une ampoule électrique, une lampe halogène ou une ou plusieurs diodes électroluminescentes. Sauf un passage ménagé par une ouverture 8 qui est réalisée dans le boîtier, l'enceinte est étanche. Cette ouverture permet l'équilibre de pression des gaz se trouvant dans l'enceinte du dispositif d'éclairage et/ou de signalisation et dans le milieu extérieur. De préférence, l'ouverture est réalisée dans une partie inférieure du boîtier, c'est-à-dire dans le fond du boîtier ou dans la partie basse d'une paroi latérale du boîtier.The enclosure is mainly constituted by a housing 2, optionally forming or containing an optical mirror, and a transparent closure glass 3. The enclosure contains a light source 4 such as in particular a light bulb, a halogen lamp or one or more light-emitting diodes . Except for a passage provided by a opening 8 which is made in the housing, the enclosure is waterproof. This opening allows the pressure balance of the gases in the enclosure of the lighting and / or signaling device and in the external environment. Preferably, the opening is made in a lower part of the housing, that is to say in the bottom of the housing or in the lower part of a side wall of the housing.

La conduite d'aération est reliée au boîtier au niveau de l'ouverture 8 par une première extrémité 11. La conduite d'aération comprend également une deuxième extrémité libre 12. La conduite d'aération comprend principalement un tuyau 5 et un moyen 6 filtrant de ce tuyau. Le tuyau peut être réalisé en toute matière, néanmoins il est préférentiellement réalisé en matière plastique souple ou rigide, par exemple en EPDM (éthylène propylène diène monomère). Par exemple, le tuyau présente une section circulaire, notamment une section interne circulaire. Cependant, il peut présenter toute autre forme de section.The ventilation duct is connected to the housing at the opening 8 by a first end 11. The ventilation duct also comprises a second free end 12. The ventilation duct mainly comprises a pipe 5 and a filtering means 6 of this pipe. The pipe may be made of any material, however it is preferably made of flexible or rigid plastic material, for example EPDM (ethylene propylene diene monomer). For example, the pipe has a circular section, including a circular internal section. However, it may have any other form of section.

Le moyen filtrant est, lui aussi, réalisé en toute matière, pourvu qu'il soit imperméable aux liquides et aux poussières et perméable aux gaz tout au long de la vie du produit. Il consiste par exemple en une membrane, par exemple réalisée grâce à une étoffe de textile ou de PTFE présentant ces propriétés. La membrane est de préférence collée dans le tuyau ou sur le tuyau. Elle peut être surmoulée avec le tuyau sous la forme pour assurer une surface d'échange la plus grande possible. Elle peut être maintenue sur une structure en forme de grillage permettant de la rigidifier en fonction de la surface mise en jeu. La membrane peut être remplacée par n'importe quel composant qui diffuse bien l'humidité et qui empêche les entrées d'eau, de poussières ou de n'importe quelle impureté. La membrane peut être positionnée n'importe où, notamment sur le tuyau, à l'intérieur du tuyau ou à l'extrémité du tuyau. De préférence, on souhaite atteindre un taux de diffusion par unité de temps et par unité de surface pour le transfert d'humidité proche de 1 mm-2.h-1. En effet, de l'humidité présente dans l'enceinte peut être évacuée vers le milieu extérieur par diffusion au travers de la membrane, le taux d'humidité à l'extrémité libre de la conduite étant inférieur au taux d'humidité dans l'enceinte. Le taux de diffusion par unité de temps est fonction de la surface de la membrane et de la nature de la perméabilité de la membrane. La pente caractérisant l'évolution du taux de diffusion en fonction de la surface en faisant l'hypothèse d'une variation linéaire est comprise entre 0.001 mm-2.h-1 et 0.01 mm-2.h-1, avec une valeur typique pour un certain type de membrane de 0.002 mm-2.h-1. La surface de la membrane est donc à adapter en fonction du type de membrane (notamment de sa perméabilité) et du taux de diffusion que l'on souhaite atteindre.The filter medium is also made of any material, provided that it is impermeable to liquids and dust and permeable to gases throughout the life of the product. It consists for example of a membrane, for example made by a textile fabric or PTFE having these properties. The membrane is preferably glued in the pipe or on the pipe. It can be overmolded with the pipe in the form to ensure the largest possible exchange surface. It can be maintained on a structure in the form of mesh to stiffen according to the surface involved. The membrane can be replaced by any component that diffuses moisture well and prevents water ingress, dust or any impurity. The membrane can be positioned anywhere, especially on the pipe, inside the pipe or at the end of the pipe. Preferably, it is desired to achieve a diffusion rate per unit of time and per unit area for the transfer. humidity close to 1 mm -2 .h -1 . Indeed, moisture present in the chamber can be discharged to the outside by diffusion through the membrane, the moisture content at the free end of the pipe being lower than the moisture content in the chamber. pregnant. The diffusion rate per unit of time is a function of the surface of the membrane and the nature of the permeability of the membrane. The slope characterizing the evolution of the diffusion rate as a function of the surface by assuming a linear variation is between 0.001 mm -2 .h -1 and 0.01 mm -2 .h -1 , with a typical value for a certain type of membrane of 0.002 mm -2 .h -1 . The surface of the membrane is to be adapted depending on the type of membrane (including its permeability) and the diffusion rate that is desired to achieve.

Les dimensions de la conduite d'aération sont déterminées en fonction du dispositif d'éclairage et/ou de signalisation, notamment en fonction du volume de l'enceinte du dispositif. En outre, l'aire S de la section droite du tuyau est fonction de sa longueur L et/ou des différents coudes qu'il peut présenter sur sa longueur. En effet, plus le tuyau est long et/ou plus son cheminement est tortueux, plus l'aire de la section droite du tuyau doit être importante pour limiter les pertes de charges dans la conduite d'aération qui sont de nature à limiter les échanges gazeux entre l'enceinte du dispositif et le milieu extérieur. De même, comme expliqué précédemment, l'aire de la membrane doit être adaptée de manière à ne pas limiter les échanges gazeux entre l'enceinte et le milieu extérieur. Ainsi, l'aire de la membrane peut être différente de, notamment supérieure à, l'aire de la section droite du tuyau. Dans ce cas, le tuyau peut présenter au niveau de la membrane une aire de section droite différente de l'aire de sa section droite à un autre niveau. Alternativement ou complémentairement, la membrane peut ne pas être disposée selon une section droite du tuyau mais en biais par rapport à celle-ci et/ou s'étendre selon une surface non-plane, afin de maximiser la surface de la membrane dans un tuyau de dimensions données.The dimensions of the ventilation duct are determined according to the lighting and / or signaling device, in particular according to the volume of the enclosure of the device. In addition, the area S of the cross section of the pipe is a function of its length L and / or the different bends it may have along its length. Indeed, the longer the pipe and / or its path is tortuous, the greater the area of the cross section of the pipe must be important to limit the pressure losses in the ventilation pipe that are likely to limit trade gas between the enclosure of the device and the external environment. Similarly, as explained above, the area of the membrane must be adapted so as not to limit the gas exchange between the chamber and the external environment. Thus, the area of the membrane may be different from, in particular greater than, the area of the cross section of the pipe. In this case, the pipe may have at the level of the membrane an area of cross section different from the area of its cross section to another level. Alternatively or additionally, the membrane may not be disposed along a straight section of the pipe but at an angle to it and / or extend along a non-planar surface, in order to maximize the surface of the membrane in a pipe of given dimensions.

Pour un dispositif d'éclairage de type projecteur dont le volume d'enceinte est compris entre 2 litres et 20 litres, l'aire de la section interne du tuyau est par exemple comprise entre 7 mm2 et 700 mm2 soit, pour un tuyau à section interne circulaire, un diamètre environ compris entre 3 mm et 30 mm et de préférence, comprise entre 38 mm2 et 320 mm2 soit, pour un tuyau à section interne circulaire, un diamètre environ compris entre 7 mm et 20 mm. L'aire de la membrane peut présenter les mêmes caractéristiques.For a projector-type lighting device whose enclosure volume is between 2 liters and 20 liters, the area of the internal section of the pipe is for example between 7 mm 2 and 700 mm 2 or, for a pipe with a circular inner section, a diameter of between 3 mm and 30 mm and preferably between 38 mm 2 and 320 mm 2 is, for a circular inner section pipe, a diameter of between 7 mm and 20 mm. The area of the membrane may have the same characteristics.

Pour un dispositif d'éclairage de type projecteur antibrouillard dont le volume d'enceinte est inférieur à 2 litres, l'aire de la section interne du tuyau est par exemple inférieure à 80 mm2 soit, pour un tuyau à section interne circulaire, un diamètre inférieur à 10 mm et de préférence, comprise entre 12 mm2 et 40 mm2 soit, pour un tuyau à section interne circulaire, un diamètre environ compris entre 4 mm et 7 mm. L'aire de la membrane peut présenter les mêmes caractéristiques.For a projector type lighting device fog which the volume of chamber is less than 2 liters, the area of the internal section of the pipe is for example less than 80 mm 2 is for a circular inner cross-section pipe, diameter less than 10 mm and preferably between 12 mm 2 and 40 mm 2 is, for a pipe with circular inner section, a diameter of between 4 mm and 7 mm. The area of the membrane may have the same characteristics.

Pour un dispositif de signalisation de type feu dont le volume d'enceinte est inférieur à 6 litres, l'aire de la section interne du tuyau est par exemple inférieure à 180 mm2 soit, pour un tuyau à section interne circulaire, un diamètre inférieur à 15 mm et de préférence, comprise entre 12 mm2 et 80 mm2 soit, pour un tuyau à section interne circulaire, un diamètre environ compris entre 4 mm et 10 mm. L'aire de la membrane peut présenter les mêmes caractéristiques.For a fire-type signaling device whose enclosure volume is less than 6 liters, the area of the internal section of the pipe is, for example, less than 180 mm 2 or, for a pipe with a circular inner section, a smaller diameter. to 15 mm and preferably between 12 mm 2 and 80 mm 2 is, for a circular inner section pipe, a diameter of between 4 mm and 10 mm. The area of the membrane may have the same characteristics.

Le problème de présence d'humidité, et donc de condensation, est plus important lorsque le moteur du véhicule sur lequel le dispositif d'éclairage et/ou de signalisation est implanté est chaud. L'air chaud a tendance à monter, l'air se situant plus bas est donc plus frais et plus sec. Il apparaît donc plus avantageux de positionner l'extrémité libre 12 du tuyau pour que celui-ci se trouve sous le projecteur plutôt que de positionner celui-ci directement au voisinage de l'enceinte du dispositif d'éclairage de signalisation, au niveau de celle-ci ou au-dessus de celle-ci. Ainsi, la conduite s'étend de préférence verticalement vers le bas ou sensiblement verticalement vers le bas depuis l'enceinte. De préférence, la conduite d'aération comprend un tuyau ayant une longueur et une conformation apte à ce que son extrémité libre 12 puisse être positionnée au niveau d'une aile du véhicule automobile, au niveau de la calandre du véhicule automobile, notamment au niveau d'une bouche de ventilation du compartiment moteur, cette bouche étant située au niveau de la calandre du véhicule automobile, ou encore en face avant du dispositif d'éclairage et/ou de signalisation. Par contre, ces zones ne sont pas à proximité de l'enceinte du dispositif d'éclairage et/ou de signalisation et le tuyau présente donc une longueur au moins supérieure à 2 cm et, de préférence supérieure à 15 cm, (la valeur de référence étant 15 cm).The problem of presence of moisture, and therefore of condensation, is greater when the engine of the vehicle on which the lighting and / or signaling device is implanted is hot. Hot air tends to rise, so the lower air is cooler and drier. It therefore seems more advantageous to position the free end 12 of the pipe so that it is under the projector rather than position it directly adjacent to, or at or above the enclosure of the signaling light device. Thus, the pipe preferably extends vertically downwards or substantially vertically downwards from the enclosure. Preferably, the aeration duct comprises a pipe having a length and a conformation so that its free end 12 can be positioned at a wing of the motor vehicle, at the level of the calender of the motor vehicle, especially at the level of a ventilation mouth of the engine compartment, the mouth being located at the front grille of the motor vehicle, or in front of the lighting and / or signaling device. On the other hand, these zones are not close to the enclosure of the lighting and / or signaling device and the pipe thus has a length at least greater than 2 cm and, preferably greater than 15 cm, (the value of reference being 15 cm).

La conduite d'aération peut présenter un cache anti-ruissellement 7. Il permet d'éviter le ruissellement de l'eau ou d'autres liquides le long du tuyau jusqu'à l'extrémité libre de celui-ci où se trouve la membrane. Ce cache anti-ruissellement peut être réalisé en n'importe quel matériau et être réalisé de n'importe quelle forme qui empêche l'eau de ruisseler sur la membrane. Par exemple, le cache anti-ruissellement peut être réalisé en matière plastique, être fixé dans la partie inférieure du tuyau directement sur celui-ci et présenter une forme s'évasant vers le bas, notamment une forme tronconique. Au cas où la membrane n'est pas disposée à l'extrémité libre du tuyau, aucun cache anti-ruissellement n'est nécessaire : en effet, c'est extrémité libre elle-même du tuyau qui, en combinaison avec la position de la membrane plus haut dans le tuyau, empêche l'eau de remonter jusqu'à membrane.The vent pipe may have a run-off cover 7. It prevents runoff of water or other liquids along the pipe to the free end thereof where the membrane is located . This run-off cover can be made of any material and can be made in any shape that prevents water from dripping onto the membrane. For example, the anti-dripping cover may be made of plastic, be fixed in the lower part of the pipe directly on the latter and have a flaring shape downwards, especially a frustoconical shape. In the case where the membrane is not disposed at the free end of the pipe, no run-off cover is necessary: indeed, it is free end itself of the pipe which, in combination with the position of the membrane higher up the pipe, prevents the water from rising up to the membrane.

Grâce au dispositif d'éclairage et/ou de signalisation selon l'invention, le moyen filtrant est la seule interface permettant des échanges gazeux entre l'enceinte 9 et le milieu extérieur.Thanks to the lighting and / or signaling device according to the invention, the filtering means is the only interface allowing gas exchange between the enclosure 9 and the external environment.

Dans une variante de réalisation, le dispositif d'éclairage et/ou de signalisation peut comprendre plusieurs ouvertures 8 auxquelles sont reliées plusieurs conduites d'aération 10.In an alternative embodiment, the lighting and / or signaling device may comprise several openings 8 to which a plurality of ventilation ducts 10 are connected.

Le dispositif de ventilation que constitue l'ouverture 8 et la conduite d'aération 10 sont très simples à réaliser par rapport aux solutions à chicanes ou à labyrinthe connues de l'art antérieur.The ventilation device that constitutes the opening 8 and the ventilation duct 10 are very simple to make compared to the baffle or labyrinth solutions known from the prior art.

La longueur de la conduite d'aération permet de positionner, comme on l'a vu, son extrémité libre en un endroit choisi et adapté pour résoudre les problèmes évoqués précédemment. Il permet notamment de positionner l'extrémité libre de la conduite d'aération à un endroit où la pression varie en fonction des caractéristiques de roulage du véhicule automobile. Ainsi, ces variations de pression permettent de favoriser les échanges gazeux entre l'intérieur de l'enceinte 9 et le milieu extérieur par une alternance de pressions et dépressions du milieu extérieur relativement à l'intérieur de l'enceinte. Ces pressions et dépressions créent, dans l'hypothèse d'un taux d'humidité dans l'enceinte supérieur au taux d'humidité au niveau de l'extrémité libre de la conduite, des flux de gaz humides vers l'extérieur de l'enceinte et des flux de gaz secs vers l'intérieur de l'enceinte.The length of the ventilation duct makes it possible, as we have seen, to position its free end in a location chosen and adapted to solve the problems mentioned above. It allows in particular to position the free end of the air duct at a place where the pressure varies according to the driving characteristics of the motor vehicle. Thus, these pressure variations make it possible to promote gas exchanges between the interior of the enclosure 9 and the external environment by alternating pressures and depressions of the external medium relative to the interior of the enclosure. These pressures and depressions create, in the event of a moisture level in the upper chamber at the moisture level at the free end of the pipe, the flow of wet gas out of the enclosure and dry gas flows into the enclosure.

Le tuyau 5 peut être un réalisé en plusieurs parties. Par exemple, il peut être réalisé en une partie supérieure rigide venant se fixer au niveau de l'ouverture 8 et en une partie inférieure souple, surmoulée sur la partie supérieure et munie de la membrane. Alternativement, le tuyau peut être réalisé en trois parties : une partie supérieure souple venant se fixer au niveau de l'ouverture 8, une partie intermédiaire rigide sur laquelle est surmoulée la partie supérieure et une partie inférieure souple, surmoulée sur la partie intermédiaire et munie de la membrane. Le moyen filtrant peut dans ces deux cas être fixé au niveau de la partie inférieure souple.The pipe 5 may be one made in several parts. For example, it can be made in a rigid upper part which is fixed at the level of the opening 8 and in a flexible lower part overmolded on the upper part and provided with the membrane. Alternatively, the pipe may be made in three parts: a flexible upper portion being fixed at the opening 8, a rigid intermediate portion on which is overmoulded the upper part and a flexible lower part overmolded on the intermediate portion and provided with the membrane. The filtering means can in these two cases be fixed at the level of the flexible lower part.

Dans le cas où l'extrémité de la conduite est disposée au niveau d'un compartiment sec et peu poussiéreux du véhicule, par exemple l'habitacle du véhicule ou un compartiment particulier à l'intérieur de cet habitacle, il est possible de se passer du moyen filtrant.In the case where the end of the pipe is disposed at a dry and dust-free compartment of the vehicle, for example the passenger compartment of the vehicle or a particular compartment inside this cabin, it is possible to do without filter medium.

L'invention s'applique à différents dispositifs d'éclairage de signalisation, notamment un projecteur avant de véhicule automobile, un projecteur antibrouillard de véhicule automobile et un feu de signalisation de véhicule automobile. Le dispositif d'éclairage et/ou de signalisation peut être un dispositif avant d'éclairage et/ou de signalisation ou un dispositif arrière d'éclairage et/ou de signalisation.The invention applies to different signaling lighting devices, including a front projector of a motor vehicle, a fog lamp for a motor vehicle and a signaling light of a motor vehicle. The lighting and / or signaling device may be a front lighting and / or signaling device or a rear lighting and / or signaling device.

Claims (9)

  1. Lighting and/or signalling device (1) for a motor vehicle, comprising an enclosure (9) formed by a housing (2) and a lens (3), an opening (8) being formed in the enclosure, comprising a ventilation conduit (10) extending from the opening, the ventilation conduit being closed off by a filtering means (6) impermeable to liquid and dust and permeable to gas, characterised in that the filtering means is a membrane (6), in particular a textile membrane, the filtering means being the only interface allowing gaseous exchanges between the enclosure and the external environment.
  2. Device according to claim 1, characterised in that the length (L) of the conduit is greater than 2 cm.
  3. Device according to one of the preceding claims, characterised in that the filtering means is adhesively bonded in the conduit or at a free end (12) of the conduit.
  4. Device according to one of the preceding claims, characterised in that the conduit is fixed to the housing by clamping or welding or snapping on.
  5. Device according to one of the preceding claims, characterised in that it comprises a plurality of openings (8) formed in the housing and from each of which a ventilation conduit (10) extends.
  6. Device according to one of the preceding claims, characterised in that the conduit comprises an anti-trickle means (7).
  7. Motor vehicle, characterised in that it comprises a lighting and/or signalling device according to one of the preceding claims.
  8. Motor vehicle according to the preceding claim, characterised in that a free end (12) of the ventilation conduit is positioned:
    - at a grille of the motor vehicle, in particular at a ventilation orifice of the engine compartment, or
    - on a wing of the motor vehicle, or
    - on the front face of the lighting and/or signalling device.
  9. Motor vehicle according to claim 7 or 8, characterised in that a free end (12) of the ventilation conduit is positioned at a point where the pressure varies according to the running characteristics of the motor vehicle.
EP10179136.6A 2009-09-29 2010-09-24 Automotive headlamps comprising a venting pipe Active EP2302293B2 (en)

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FR0956721A FR2950675B1 (en) 2009-09-29 2009-09-29 LIGHTING AND / OR SIGNALING DEVICE FOR A MOTOR VEHICLE COMPRISING AN AERATION PIPE

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EP2302293B1 true EP2302293B1 (en) 2016-06-29
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EP (1) EP2302293B2 (en)
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TWM401582U (en) 2011-04-11
ES2590982T3 (en) 2016-11-24
US20110075439A1 (en) 2011-03-31
EP2302293A1 (en) 2011-03-30
FR2950675B1 (en) 2013-05-17
CN201992611U (en) 2011-09-28
EP2302293B2 (en) 2019-06-19
FR2950675A1 (en) 2011-04-01

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