EP1055819A1 - Hydraulic gear pump - Google Patents

Hydraulic gear pump Download PDF

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Publication number
EP1055819A1
EP1055819A1 EP00401476A EP00401476A EP1055819A1 EP 1055819 A1 EP1055819 A1 EP 1055819A1 EP 00401476 A EP00401476 A EP 00401476A EP 00401476 A EP00401476 A EP 00401476A EP 1055819 A1 EP1055819 A1 EP 1055819A1
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EP
European Patent Office
Prior art keywords
pinion
pump according
pump
polymer
pinions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00401476A
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German (de)
French (fr)
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EP1055819B1 (en
Inventor
François Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydroperfect International Inc
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Hydroperfect International Inc
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Publication date
Application filed by Hydroperfect International Inc filed Critical Hydroperfect International Inc
Publication of EP1055819A1 publication Critical patent/EP1055819A1/en
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Publication of EP1055819B1 publication Critical patent/EP1055819B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels

Definitions

  • the invention relates to a hydraulic gear pump of the type comprising a driving pinion and a driven pinion meshing with each other, in a casing comprising a suction channel and a discharge channel of a hydraulic fluid.
  • gear pumps of this type which are known, the two pinions are made of steel and have the major drawback of producing significant noise emissions which increase with the speed of rotation of gables. As long as a maximum permissible noise level is fixed by standards, the field of use of hydraulic pumps gear is limited.
  • the object of the present invention is to reduce the noise level of the pumps. gear hydraulics of the type indicated above.
  • the hydraulic gear pump according to the invention is characterized in that at least one of the pinions is made of a material having, in addition to mechanical strength properties, properties vibration damping.
  • the material constituting said pinion has a relatively low coefficient of friction.
  • At least the pinion led is made of low friction material having vibration damping properties.
  • the constituent material said pinion is a polymeric material.
  • the polymer material is a semi-crystalline aromatic linear polymer such as the material marketed under the name of PEEK.
  • Figure 1 is an axial sectional view of a hydraulic pump standard gear.
  • Figure 2 is a sectional view along the line II-II of Figure 1, more large scale.
  • the improved hydraulic gear pump according to the invention has the standard structure known per se as shown in Figures 1 and 2.
  • These pumps essentially comprise a housing or casing 1 formed by a body central 2 and front and rear bodies 3 and 4 respectively which define a substantially cylindrical internal space in which two are mounted pinions meshing with each other, namely a driving pinion 6 driven in rotation by a drive shaft 7 and a driven pinion 8.
  • the pinions are carried by front and rear bearings indicated at 10 and 11 respectively.
  • the drawing further shows at 12 the assembly tie rods of the casing.
  • the latter has a suction path 13 of a hydraulic fluid and a discharge path 14 of pressurized fluid.
  • the particularity of the present invention resides in the fact that at least one of the pinions 6, 8, namely in particular the driven pinion 8, is produced in a material having in addition appropriate mechanical properties, namely a good resistance to wear and friction, damping properties vibrations induced in the pinion.
  • a particularly suitable material is formed from polymers or copolymers advantageously modified by carbon loads. But any other material that has both properties above can be used.
  • the material of the led gear could be semi-crystalline aromatic linear polymer marketed under the name PEEK.
  • a gear in polymer material, in accordance with the present invention can be manufactured by injection into a mold, which makes it possible to manufacture the pinion a low cost price.
  • the use of the polymer material in reducing the noise level extends the possible speed range of the pump.
  • the pump, rotating faster has a smaller displacement and is therefore less bulky, on the one hand, and at a price on the other hand, due to the gain in material. In this advantage adds a lighter weight.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

The pump (1) consists of a housing (2) with suction (13) and pressure (14) channels, containing meshing driving and driven g (6, 8). At least one of the two gears is made from a material with vibration damping properties and a low friction coefficient, as a polymer or copolymer optionally modified with carbon filler and suitable for injection moulding.

Description

L'invention concerne une pompe hydraulique à engrenage du type comprenant un pignon menant et un pignon mené engrènant l'un l'autre, dans un carter comportant un canal d'aspiration et un canal de refoulement d'un fluide hydraulique.The invention relates to a hydraulic gear pump of the type comprising a driving pinion and a driven pinion meshing with each other, in a casing comprising a suction channel and a discharge channel of a hydraulic fluid.

Dans les pompes à engrenage de ce type, qui sont connues, les deux pignons sont réalisés en acier et présentent l'inconvénient majeur de produire des émissions sonores importantes qui augmentent avec la vitesse de rotation des pignons. Dans la mesure où un niveau maximal de bruit admissible est fixé par des normes, le champ de l'utilisation des pompes hydrauliques à engrenage est limité.In gear pumps of this type, which are known, the two pinions are made of steel and have the major drawback of producing significant noise emissions which increase with the speed of rotation of gables. As long as a maximum permissible noise level is fixed by standards, the field of use of hydraulic pumps gear is limited.

La présente invention a pour but de réduire le niveau de bruit des pompes hydrauliques à engrenage du type indiqué plus haut.The object of the present invention is to reduce the noise level of the pumps. gear hydraulics of the type indicated above.

Pour atteindre ce but, la pompe hydraulique à engrenage selon l'invention est caractérisée en ce qu'au moins un des pignons est réalisé en un matériau ayant, en plus des propriétés de résistance mécanique, des propriétés d'amortissement de vibrations.To achieve this goal, the hydraulic gear pump according to the invention is characterized in that at least one of the pinions is made of a material having, in addition to mechanical strength properties, properties vibration damping.

Selon une caractéristique selon l'invention, le matériau constitutif dudit pignon possède un coefficient de frottement relativement faible.According to a characteristic according to the invention, the material constituting said pinion has a relatively low coefficient of friction.

Selon encore une autre caractéristique de l'invention, au moins le pignon mené est réalisé en le matériau à faible coefficient de frottement ayant des propriétés d'amortissement de vibrations.According to yet another characteristic of the invention, at least the pinion led is made of low friction material having vibration damping properties.

Selon encore une autre caractéristique de l'invention, le matériau constitutif dudit pignon est un matériau polymère. According to yet another characteristic of the invention, the constituent material said pinion is a polymeric material.

Selon encore une autre caractéristique de l'invention, le matériau polymère est un polymère linéaire aromatique semi-cristalin tel que le matériau commercialisé sous le nom de PEEK.According to yet another characteristic of the invention, the polymer material is a semi-crystalline aromatic linear polymer such as the material marketed under the name of PEEK.

L'invention sera mieux comprise et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaítront plus clairement dans la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemples illustrant un mode de réalisation de l'invention et sur lesquels.The invention will be better understood and other aims, characteristics, details and advantages thereof will appear more clearly in the description explanatory which will follow made with reference to the attached schematic drawings given only as examples illustrating an embodiment of the invention and on which.

La figure 1 est une vue en coupe axiale d'une pompe hydraulique à engrenage standard.Figure 1 is an axial sectional view of a hydraulic pump standard gear.

La figure 2 est une vue en coupe, selon la ligne II-II de la figure 1, à plus grande échelle.Figure 2 is a sectional view along the line II-II of Figure 1, more large scale.

La pompe hydraulique à engrenage améliorée selon l'invention présente la structure standard connue en soi telle que montrée sur les figures 1 et 2. Ces pompes comportent essentiellement un boítier ou carter 1 formé par un corps central 2 et des corps avant et arrière respectivement 3 et 4 qui délimitent un espace interne sensiblement cylindrique dans lequel sont montés deux pignons engrenant l'un l'autre, à savoir un pignon menant 6 entraíné en rotation par un arbre moteur 7 et un pignon mené 8. Les pignons sont portés par des paliers avant et arrière indiqués respectivement en 10 et en 11. Le dessin montre en outre en 12 des tirants d'assemblage du carter.The improved hydraulic gear pump according to the invention has the standard structure known per se as shown in Figures 1 and 2. These pumps essentially comprise a housing or casing 1 formed by a body central 2 and front and rear bodies 3 and 4 respectively which define a substantially cylindrical internal space in which two are mounted pinions meshing with each other, namely a driving pinion 6 driven in rotation by a drive shaft 7 and a driven pinion 8. The pinions are carried by front and rear bearings indicated at 10 and 11 respectively. the drawing further shows at 12 the assembly tie rods of the casing.

Comme on le voit sur la figure 2, ce dernier comporte une voie 13 d'aspiration d'un fluide hydraulique et une voie de refoulement 14 de fluide sous pression.As seen in Figure 2, the latter has a suction path 13 of a hydraulic fluid and a discharge path 14 of pressurized fluid.

Dans les pompes de ce type, les émissions sonores ont deux sources, à savoir elles proviennent de l'engrenage proprement dit, mais aussi du couplage du fluide et de la structure. Concernant le bruit d'engrènement, pendant l'engrènement des pignons qui sont à denture droite à développante de cercle, il se produit inévitablement des glissements relatifs entre les deux flans de dents en contact. Ces glissements engendrent des frottements et donc du bruit. Lorsque les deux pignons sont en acier, le bruit issu du frottement est assez important, notamment en raison de leur coefficient de frottement élevé.In pumps of this type, noise emissions have two sources, know they come from the gear itself, but also from the coupling of the fluid and the structure. Regarding meshing noise, during the meshing of the pinions which are straight to involute of circle, there is inevitably relative sliding between the two flans of teeth in contact. These slippages cause friction and so noise. When the two pinions are made of steel, the noise from the friction is quite significant, in particular because of their coefficient of high friction.

Concernant le couplage entre le fluide et la structure, on a constaté dans le cadre de l'invention, qu'au cours du processus d'engrènement un volume d'huile indiqué en 16 se retrouve emprisonné entre les dents et les deux lumières d'échappement pratiquées sur les paliers de la pompe, à l'aspiration et au refoulement, désignés respectivement par les références 17 et 18. Ce volume de fluide hydraulique est comprimé puis détendu lorsque les dents s'ouvrent à l'aspiration. Ce cycle de compression-détente induit une excitation périodique sur les dents des pignons, qui se traduit par des vibrations de l'ensemble formé par les pignons, les paliers et le corps de la pompe. Les vibrations sont ensuite rayonnées dans le milieu ambiant et créent le bruit.Regarding the coupling between the fluid and the structure, we found in framework of the invention, that during the meshing process a volume of oil indicated in 16 is trapped between the teeth and the two exhaust lights on the pump bearings, on suction and discharge, designated by the references 17 and 18 respectively. This volume of hydraulic fluid is compressed and then expanded when the teeth open at suction. This compression-relaxation cycle induces excitation periodic on the teeth of the gables, which results in vibrations of the assembly formed by the pinions, the bearings and the pump body. The vibrations are then radiated into the surrounding environment and create noise.

La particularité de la présente invention réside dans le fait qu'au moins un des pignons 6, 8, à savoir notamment le pignon mené 8, est réalisé en un matériau ayant en plus des propriétés mécaniques appropriées, à savoir une bonne résistance à l'usure et au frottement, des propriétés d'amortissement des vibrations induites dans le pignon. Un matériau particulièrement approprié est formé des polymères ou copolymères avantageusement modifiés par des charges de carbone. Mais tout autre matériau qui possède les deux propriétés susmentionnées peut être utilisé. A titre d'exemple, le matériau constitutif du pignon mené pourrait être le polymère linéaire aromatique semi-cristallin commercialisé sous le nom PEEK. The particularity of the present invention resides in the fact that at least one of the pinions 6, 8, namely in particular the driven pinion 8, is produced in a material having in addition appropriate mechanical properties, namely a good resistance to wear and friction, damping properties vibrations induced in the pinion. A particularly suitable material is formed from polymers or copolymers advantageously modified by carbon loads. But any other material that has both properties above can be used. For example, the material of the led gear could be semi-crystalline aromatic linear polymer marketed under the name PEEK.

Le remplacement d'au moins un des pignons en acier par un pignon réalisé en ledit matériau mécaniquement résistant et susceptible d'amortir des vibrations permet d'abaisser le coefficient de frottement donc de réduire le frottement et le bruit qui en résulte. D'autre part, en raison de sa propriété d'amortissement structurale très supérieure à celui de l'acier, une grande partie de l'énergie vibratoire est absorbée et dissipée sous forme de chaleur dans le matériau. Cette chaleur sera dégagée par le fluide hydraulique traversant la pompe.The replacement of at least one of the steel pinions by a pinion made in said mechanically resistant material capable of absorbing vibrations allows to lower the coefficient of friction therefore to reduce friction and the resulting noise. On the other hand, due to its damping property structural much higher than that of steel, a large part of the energy vibratory is absorbed and dissipated as heat in the material. This heat will be released by the hydraulic fluid passing through the pump.

Un pignon en matériau polymère, conforme à la présente invention, peut être fabriqué par injection dans un moule, ce qui permet de fabriquer le pignon à un faible prix de revient.A gear in polymer material, in accordance with the present invention, can be manufactured by injection into a mold, which makes it possible to manufacture the pinion a low cost price.

Etant donné que le niveau de bruit rayonné par la pompe augmente de façon quasi-linéaire avec la vitesse de rotation, l'utilisation du matériau polymère en réduisant le niveau sonore étend la plage de vitesse possible de la pompe. Ainsi, au même débit d'utilisation, la pompe en tournant plus vite a une cylindrée plus petite et est ainsi moins encombrante, d'une part, et d'un prix de revient plus faible, d'autre part, en raison du gain de matière. A cet avantage s'ajoute un poids plus faible.As the noise level radiated by the pump increases so quasi-linear with the speed of rotation, the use of the polymer material in reducing the noise level extends the possible speed range of the pump. Thus, at the same operating rate, the pump, rotating faster, has a smaller displacement and is therefore less bulky, on the one hand, and at a price on the other hand, due to the gain in material. In this advantage adds a lighter weight.

A titre d'exemple, lorsque l'on compare une pompe hydraulique à engrenage selon l'invention, d'une cylindrée de 1 cm3/tour, tournant à une vitesse de rotation de 3000 tours/min. et dont le pignon mené est en PEEK, à une pompe standard, c'est-à-dire avec des pignons en acier, en mesurant le bruit global en chambre sourde avec un sonomètre placé à 50 cm de la pompe, on constate que le niveau de bruit de la pompe standard se situe autour de 51 dBA, alors que le niveau de bruit de la pompe selon l'invention est de seulement 48 dBA. Cette réduction de 3 dBA obtenue grâce à l'invention correspond à u niveau de bruit divisé par 2, c'est-à-dire représente une réduction considérable du bruit.By way of example, when a hydraulic gear pump according to the invention is compared, with a displacement of 1 cm 3 / revolution, rotating at a rotation speed of 3000 revolutions / min. and whose driven pinion is in PEEK, with a standard pump, that is to say with steel pinions, by measuring the overall noise in an anechoic chamber with a sound level meter placed 50 cm from the pump, we see that the noise level of the standard pump is around 51 dBA, while the noise level of the pump according to the invention is only 48 dBA. This reduction of 3 dBA obtained thanks to the invention corresponds to a noise level divided by 2, that is to say represents a considerable reduction in noise.

Claims (6)

Pompe hydraulique à engrenage du type comprenant un pignon menant et un pignon mené engrenant l'un l'autre dans un carter comportant un canal d'aspiration et un canal de refoulement d'un fluide hydraulique, caractérisée en ce qu'au moins un des pignons (6, 8) est réalisé en un matériau ayant, en plus des propriétés de résistance mécanique, des propriétés d'amortissement de vibrations.Hydraulic gear pump of the type comprising a driving pinion and a driven pinion meshing each other in a casing comprising a channel suction and delivery channel for hydraulic fluid, characterized in that at least one of the pinions (6, 8) is made of a material having, in plus mechanical strength properties, damping properties vibrations. Pompe selon la revendication 1, caractérisée en ce le matériau constitutif dudit pignon (6, 8) possède un coefficient de frottement relativement faible.Pump according to claim 1, characterized in that the constituent material said pinion (6, 8) has a relatively low coefficient of friction. Pompe selon la revendication 2, caractérisée en ce qu'au moins le pignon mené (8) est réalisé en le matériau à faible coefficient de frottement ayant des propriétés d'amortissement de vibrations.Pump according to claim 2, characterized in that at least the pinion led (8) is made of the low friction material having vibration damping properties. Pompe selon l'une des revendications 1 à 3, caractérisée en ce que le matériau constitutif du pignon est un matériau polymère ou copolymère, le cas échéant modifié par des charges de carbone.Pump according to one of claims 1 to 3, characterized in that the material of the pinion is a polymer or copolymer material, if applicable if necessary modified by carbon charges. Pompe selon la revendication 4, caractérisée en ce que le matériau polymère est un polymère linéaire aromatique semi-cristallin tel que le matériau commercialisé sous le nom PEEK.Pump according to claim 4, characterized in that the material polymer is a linear semi-crystalline aromatic polymer such as material sold under the name PEEK. Pompe selon l'une des revendications précédentes, caractérisée en ce que le pignon (6, 8) est susceptible d'être fabriqué par injection.Pump according to one of the preceding claims, characterized in that the pinion (6, 8) is capable of being produced by injection.
EP20000401476 1999-05-28 2000-05-25 Hydraulic gear pump Expired - Lifetime EP1055819B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9906801A FR2794188B1 (en) 1999-05-28 1999-05-28 GEAR HYDRAULIC PUMP
FR9906801 1999-05-28

Publications (2)

Publication Number Publication Date
EP1055819A1 true EP1055819A1 (en) 2000-11-29
EP1055819B1 EP1055819B1 (en) 2007-10-24

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EP20000401476 Expired - Lifetime EP1055819B1 (en) 1999-05-28 2000-05-25 Hydraulic gear pump

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EP (1) EP1055819B1 (en)
DE (1) DE60036833T2 (en)
FR (1) FR2794188B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007028429A1 (en) * 2005-09-02 2007-03-15 Fresenius Medical Care Deutschland Gmbh Gearwheel pump
WO2019211540A1 (en) 2018-05-04 2019-11-07 Exoes Gear pump for circulating a fluid

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57151087A (en) * 1981-03-12 1982-09-18 Matsushita Electric Ind Co Ltd Gear pump
US4583924A (en) * 1983-11-10 1986-04-22 Fresenius Ag Gear pump, especially for medical purposes
US5163824A (en) * 1990-04-23 1992-11-17 Transcience Associates Inc. Rubber-geared pump with shaftless gear
JPH08247246A (en) * 1995-01-11 1996-09-24 Mitsubishi Heavy Ind Ltd Lubricating device of rack pinion for carrier
JPH1028930A (en) * 1996-07-15 1998-02-03 Nkk Corp Resin-coated metallic body
JPH1077974A (en) * 1996-09-03 1998-03-24 Heishin Sobi Kk Single-shaft eccentric screw pump
US5865239A (en) * 1997-02-05 1999-02-02 Micropump, Inc. Method for making herringbone gears

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57151087A (en) * 1981-03-12 1982-09-18 Matsushita Electric Ind Co Ltd Gear pump
US4583924A (en) * 1983-11-10 1986-04-22 Fresenius Ag Gear pump, especially for medical purposes
US5163824A (en) * 1990-04-23 1992-11-17 Transcience Associates Inc. Rubber-geared pump with shaftless gear
JPH08247246A (en) * 1995-01-11 1996-09-24 Mitsubishi Heavy Ind Ltd Lubricating device of rack pinion for carrier
JPH1028930A (en) * 1996-07-15 1998-02-03 Nkk Corp Resin-coated metallic body
JPH1077974A (en) * 1996-09-03 1998-03-24 Heishin Sobi Kk Single-shaft eccentric screw pump
US5865239A (en) * 1997-02-05 1999-02-02 Micropump, Inc. Method for making herringbone gears

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 256 (M - 179) 15 December 1982 (1982-12-15) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 01 31 January 1997 (1997-01-31) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 06 30 April 1998 (1998-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 08 30 June 1998 (1998-06-30) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007028429A1 (en) * 2005-09-02 2007-03-15 Fresenius Medical Care Deutschland Gmbh Gearwheel pump
WO2019211540A1 (en) 2018-05-04 2019-11-07 Exoes Gear pump for circulating a fluid
FR3080892A1 (en) * 2018-05-04 2019-11-08 Exoes GEAR PUMP FOR CIRCULATING A FLUID

Also Published As

Publication number Publication date
DE60036833D1 (en) 2007-12-06
FR2794188A1 (en) 2000-12-01
EP1055819B1 (en) 2007-10-24
FR2794188B1 (en) 2001-08-10
DE60036833T2 (en) 2008-07-31

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