EP0748939A1 - Electromotor-pump assembly - Google Patents

Electromotor-pump assembly Download PDF

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Publication number
EP0748939A1
EP0748939A1 EP96401120A EP96401120A EP0748939A1 EP 0748939 A1 EP0748939 A1 EP 0748939A1 EP 96401120 A EP96401120 A EP 96401120A EP 96401120 A EP96401120 A EP 96401120A EP 0748939 A1 EP0748939 A1 EP 0748939A1
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EP
European Patent Office
Prior art keywords
pump
electric motor
assembly according
pump body
damping chambers
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.)
Withdrawn
Application number
EP96401120A
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German (de)
French (fr)
Inventor
Christian c/o H.P.I. Trintignac
Hiroshi c/o H.P.I. Oishi
Yoshiaki c/o H.P.I. Hamasaki
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
Original Assignee
Hydroperfect International Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hydroperfect International Inc filed Critical Hydroperfect International Inc
Publication of EP0748939A1 publication Critical patent/EP0748939A1/en
Withdrawn legal-status Critical Current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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses

Definitions

  • the present invention relates to assemblies or groups comprising an electric motor and a hydraulic pump and, more particularly, those of these assemblies or groups whose hydraulic pump is of the gear type.
  • Assemblies or groups of the type concerned by the invention are used in various fields of technology and in particular for assisting the management of vehicles, since they make it possible to deliver high fluid pressures even when the engine vehicle temperature is idling or close to idling as is the case during vehicle garage maneuvers.
  • a hollow damping body has the effect of substantially lengthening the length of the assembly of the motor-pump group so that it therefore becomes difficult to install it.
  • the invention solves both the problem of damping at least the sound frequencies and that of congestion.
  • the assembly of electric motor and hydraulic pump with high compactness in which an electric motor arranged in a casing forming a reservoir drives the input shaft of a gear pump arranged in a pump body is characterized in what said pump body forms, from its lateral sides and around the gears, damping chambers connected in series and in which the hydraulic fluid circulates.
  • Fig. 1 is a sectional elevation view, in part schematic, of the electric motor - hydraulic pump with high compactness of the invention.
  • Fig. 2 is a section taken substantially along line II-II of FIG. 1.
  • Fig. 3 is a section seen substantially along line III-III of FIG. 2.
  • Fig. 4 is a partial section, on a larger scale, of an embodiment detail.
  • Fig. 1 shows an electric motor 1 arranged in an envelope 2 also constituting a reservoir for hydraulic fluid.
  • the motor 1 is connected by a coupling 3 to the input shaft 4 of a hydraulic pump 5 of the gear type in socket 6, 7 disposed in a pump body 8.
  • the pump body 8 is centered on an interface plate 9 by means of studs 10 passed through holes 11.
  • the pump body 8 is closed by a plate 12 containing a pressure relief valve 13 described in more detail in the following.
  • the motor 1 - interface plate 9 - pump body 8 and plate 12 assembly is joined by means of tie rods 14 passed through the holes 11.
  • the tie rods 14 pass, moreover, through a ring 15 which holds the reservoir 2 on a seal 16 of the casing of the engine 1 as illustrated in FIG. 4.
  • the hydraulic liquid coming from the motor casing is brought into the pump body by a conduit 17 and is directed along the arrow f1 into the intake chamber 18 of the gears 6, 7.
  • the pressurized liquid is then discharged according to the arrow f2 of the discharge chamber 19 then, by a conduit 20, the liquid under high pressure is brought into successive damping chambers such as 21, 22, 23 ... delimited advantageously from side walls of the pump body 8 which surrounds the gears 6, 7.
  • Damping chambers such as 21 and 23 are formed from the two lateral sides of the pump body 8 and have variable shapes and volumes determined as a function of the frequencies to be damped.
  • Figs. 2 and 3 show that the damping chambers formed from each side of the pump body 8 communicate through a channel 24 so that the circulation of the liquid under high pressure is carried out in series in said chambers which surround the pump itself.
  • the terminal damping chamber for example the chamber 23, communicates by a channel 25, on the one hand, with a conduit 26 leading to a device for using the fluid under pressure and, on the other hand, by means of a bypass duct 27 towards the inlet of the pressure relief valve 13.
  • the valve 13 comprises a cartridge 28 provided with a seal 29 and this cartridge is held in place by a plug 30, itself provided with a seal 31.
  • a compression spring 32 bears against the plug 30 and against a pusher 33 which is connected by a ball 34 to a piston 35 forming a drawer.
  • the cartridge 28 is surrounded over part of its height by a chamber 36 communicating by radial holes 37 with the interior of said cartridge, namely its inlet bore 38, and by a hole 39 with the part of the cartridge containing the pusher 33 and the spring 32.
  • the chamber 36 is connected by a channel 40 to the low pressure of the pump by a conduit 41 which passes through the pump body 8 and communicates with the conduit 17 leading to the tank envelope 2.
  • the hole 39 communicating the chamber 36 with the interior of the cartridge 28 containing the spring 32 permanently balances the pressure.
  • the pusher 33 being connected to the piston 35 forming a drawer by the ball 34, this has the effect that the piston 35 is always guided by the wall of the bore 38 of the cartridge thereby eliminating all disturbed movements that could otherwise be suffered this piston.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Pumps (AREA)

Abstract

The electric motor and pump assembly includes an electric motor (1) situated inside an envelope (2) which forms the fluid reservoir. The motor drives the input shaft (4) of a pump with gearing arranged within the body of the pump (8). The body of the pump combines with the side walls of the gear mechanism in order to define damping chambers (21,22,23,..) which are connected in series with the high pressure hydraulic fluid circulating through them. The damping chambers are closed laterally on the one hand by an interface plate (9), and on the other hand by a further plate (12) containing an over-pressure valve communicating with a conduit (41) for its exhaust. This conduit passes through the body of the pump and opens in the reservoir (2) of the surrounding the electric motor.

Description

La présente invention concerne les ensembles ou groupes comportant un moteur électrique et une pompe hydraulique et, plus particulièrement, ceux de ces ensembles ou groupes dont la pompe hydraulique est du type à engrenages.The present invention relates to assemblies or groups comprising an electric motor and a hydraulic pump and, more particularly, those of these assemblies or groups whose hydraulic pump is of the gear type.

Des ensembles ou groupes du type concerné par l'invention sont mis en oeuvre dans différents domaines de la technique et notamment pour l'assistance de la direction de véhicules, étant donné qu'ils permettent de délivrer des pressions de fluide élevées même lorsque le moteur thermique du véhicule est au ralenti ou proche du ralenti comme cela est le cas lors de manoeuvres de garage du véhicule.Assemblies or groups of the type concerned by the invention are used in various fields of technology and in particular for assisting the management of vehicles, since they make it possible to deliver high fluid pressures even when the engine vehicle temperature is idling or close to idling as is the case during vehicle garage maneuvers.

L'inconvénient de ces ensembles ou groupes réside dans le bruit qu'ils occasionnent qui est souvent perceptible à l'intérieur du véhicule et même à l'extérieur de celui-ci.The drawback of these assemblies or groups lies in the noise which they cause which is often perceptible inside the vehicle and even outside of it.

Pour pallier cet inconvénient, il a été envisagé de disposer, au-delà de la pompe à engrenages dans une direction axiale par rapport à celle-ci, un corps creux délimitant des chambres de circulation pour le fluide refoulé afin que ce fluide soit perturbé dans son écoulement en provoquant l'amortissement au moins des fréquences de vibration les plus audibles.To overcome this drawback, it has been envisaged to have, beyond the gear pump in an axial direction relative to the latter, a hollow body delimiting circulation chambers for the pumped fluid so that this fluid is disturbed in its flow by causing the damping of at least the most audible vibration frequencies.

La mise en oeuvre d'un corps creux d'amortissement a pour effet d'allonger sensiblement la longueur de l'ensemble du groupe moteur - pompe de sorte qu'il devient ainsi difficile de le mettre en place.The use of a hollow damping body has the effect of substantially lengthening the length of the assembly of the motor-pump group so that it therefore becomes difficult to install it.

L'invention résout à la fois le problème de l'amortissement au moins des fréquences sonores et celui de l'encombrement.The invention solves both the problem of damping at least the sound frequencies and that of congestion.

Conformément à l'invention, l'ensemble moteur électrique et pompe hydraulique à grande compacité dans lequel un moteur électrique disposé dans une enveloppe formant réservoir entraîne l'arbre d'entrée d'une pompe à engrenages disposée dans un corps de pompe est caractérisé en ce que ledit corps de pompe forme, à partir de ses côtés latéraux et autour des engrenages, des chambres d'amortissement reliées en série et dans lesquelles circule le fluide hydraulique.According to the invention, the assembly of electric motor and hydraulic pump with high compactness in which an electric motor arranged in a casing forming a reservoir drives the input shaft of a gear pump arranged in a pump body is characterized in what said pump body forms, from its lateral sides and around the gears, damping chambers connected in series and in which the hydraulic fluid circulates.

Diverses autres caractéristiques de l'invention ressortent d'ailleurs de la description détaillée qui suit.Various other characteristics of the invention will also emerge from the detailed description which follows.

Une forme de réalisation de l'objet de l'invention est représentée, à titre d'exemple non limitatif, aux dessins annexés.An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawings.

La fig. 1 est une coupe-élévation, en partie schématique, de l'ensemble moteur électrique - pompe hydraulique à grande compacité de l'invention.Fig. 1 is a sectional elevation view, in part schematic, of the electric motor - hydraulic pump with high compactness of the invention.

La fig. 2 est une coupe prise sensiblement suivant la ligne II-II de la fig. 1.Fig. 2 is a section taken substantially along line II-II of FIG. 1.

La fig. 3 est une coupe vue sensiblement suivant la ligne III-III de la fig. 2.Fig. 3 is a section seen substantially along line III-III of FIG. 2.

La fig. 4 est une coupe partielle, à plus grande échelle, d'un détail de réalisation.Fig. 4 is a partial section, on a larger scale, of an embodiment detail.

La fig. 1 montre un moteur électrique 1 disposé dans une enveloppe 2 constituant aussi un réservoir pour du liquide hydraulique.Fig. 1 shows an electric motor 1 arranged in an envelope 2 also constituting a reservoir for hydraulic fluid.

Le moteur 1 est relié par un accouplement 3 à l'arbre d'entrée 4 d'une pompe hydraulique 5 du type à engrenages en prise 6, 7 disposée dans un corps de pompe 8. Le corps de pompe 8 est centré sur une plaque d'interface 9 au moyen de goujons 10 passés dans des trous 11.The motor 1 is connected by a coupling 3 to the input shaft 4 of a hydraulic pump 5 of the gear type in socket 6, 7 disposed in a pump body 8. The pump body 8 is centered on an interface plate 9 by means of studs 10 passed through holes 11.

A l'opposé de la plaque d'interface 9, le corps de pompe 8 est fermé par un plateau 12 contenant un clapet de surpression 13 décrit plus en détail dans ce qui suit.Opposite the interface plate 9, the pump body 8 is closed by a plate 12 containing a pressure relief valve 13 described in more detail in the following.

L'ensemble moteur 1 - plaque d'interface 9 - corps de pompe 8 et plateau 12 est réuni au moyen de tirants 14 passés dans les trous 11.The motor 1 - interface plate 9 - pump body 8 and plate 12 assembly is joined by means of tie rods 14 passed through the holes 11.

Les tirants 14 passent, en outre, dans un anneau 15 qui maintient le réservoir 2 sur un joint d'étanchéité 16 de l'enveloppe du moteur 1 ainsi que l'illustre la fig. 4.The tie rods 14 pass, moreover, through a ring 15 which holds the reservoir 2 on a seal 16 of the casing of the engine 1 as illustrated in FIG. 4.

Le liquide hydraulique provenant de l'enveloppe du moteur est amené dans le corps de pompe par un conduit 17 et est dirigé suivant la flèche f1 dans la chambre d'admission 18 des engrenages 6, 7. Le liquide sous pression est ensuite refoulé suivant la flèche f2 de la chambre de refoulement 19 puis, par un conduit 20, le liquide sous haute pression est amené dans des chambres d'amortissement successives telles que 21, 22, 23 ... délimitées avantageusement à partir de parois latérales du corps de pompe 8 qui entoure les engrenages 6, 7.The hydraulic liquid coming from the motor casing is brought into the pump body by a conduit 17 and is directed along the arrow f1 into the intake chamber 18 of the gears 6, 7. The pressurized liquid is then discharged according to the arrow f2 of the discharge chamber 19 then, by a conduit 20, the liquid under high pressure is brought into successive damping chambers such as 21, 22, 23 ... delimited advantageously from side walls of the pump body 8 which surrounds the gears 6, 7.

Des chambres d'amortissement telles que 21 et 23 sont formées à partir des deux côtés latéraux du corps de pompe 8 et présentent des formes et des volumes variables déterminés en fonction des fréquences à amortir.Damping chambers such as 21 and 23 are formed from the two lateral sides of the pump body 8 and have variable shapes and volumes determined as a function of the frequencies to be damped.

Les fig. 2 et 3 montrent que les chambres d'amortissement formées à partir de chaque côté du corps de pompe 8 communiquent par un canal 24 de sorte que la circulation du liquide sous haute pression s'effectue en série dans lesdites chambres qui entourent la pompe proprement dite.Figs. 2 and 3 show that the damping chambers formed from each side of the pump body 8 communicate through a channel 24 so that the circulation of the liquid under high pressure is carried out in series in said chambers which surround the pump itself.

Cela a pour effet que les fréquences audibles engendrées par le fonctionnement de la pompe sont amorties par le liquide refoulé dans lesdites chambres et par la masse du corps de pompe qui entoure les engrenages générateurs desdites fréquences à amortir.This has the effect that the audible frequencies generated by the operation of the pump are damped by the liquid discharged into said chambers and by the mass of the pump body which surrounds the gears generating said frequencies to be damped.

En se référant de nouveau à la fig. 1, il doit être constaté que la chambre d'amortissement terminale, par exemple la chambre 23, communique par un canal 25, d'une part, avec un conduit 26 menant vers un dispositif d'utilisation du fluide sous pression et, d'autre part, au moyen d'un conduit de dérivation 27 vers l'entrée du clapet de surpression 13.Referring again to FIG. 1, it should be noted that the terminal damping chamber, for example the chamber 23, communicates by a channel 25, on the one hand, with a conduit 26 leading to a device for using the fluid under pressure and, on the other hand, by means of a bypass duct 27 towards the inlet of the pressure relief valve 13.

Le clapet 13 comporte une cartouche 28 munie d'un joint d'étanchéité 29 et cette cartouche est maintenue en place par un bouchon 30, lui-même muni d'un joint d'étanchéité 31.The valve 13 comprises a cartridge 28 provided with a seal 29 and this cartridge is held in place by a plug 30, itself provided with a seal 31.

Un ressort de compression 32 prend appui contre le bouchon 30 et contre un poussoir 33 qui est relié par une bille 34 à un piston 35 formant tiroir.A compression spring 32 bears against the plug 30 and against a pusher 33 which is connected by a ball 34 to a piston 35 forming a drawer.

La cartouche 28 est entourée sur une partie de sa hauteur par une chambre 36 communiquant par des trous radiaux 37 avec l'intérieur de ladite cartouche, à savoir son alésage d'entrée 38, et par un trou 39 avec la partie de la cartouche contenant le poussoir 33 et le ressort 32.The cartridge 28 is surrounded over part of its height by a chamber 36 communicating by radial holes 37 with the interior of said cartridge, namely its inlet bore 38, and by a hole 39 with the part of the cartridge containing the pusher 33 and the spring 32.

La chambre 36 est reliée par un canal 40 à la basse pression de la pompe par un conduit 41 qui traverse le corps de pompe 8 et communique avec le conduit 17 menant à l'enveloppe réservoir 2.The chamber 36 is connected by a channel 40 to the low pressure of the pump by a conduit 41 which passes through the pump body 8 and communicates with the conduit 17 leading to the tank envelope 2.

En cas de surpression dans le conduit 26 menant à un dispositif d'utilisation, cette surpression est appliquée par le conduit de dérivation 27 à l'intérieur de l'alésage 38 de la cartouche, ce qui provoque le coulissement du piston 35 qui découvre plus ou moins les trous radiaux 37 en permettant ainsi aux fluides de passer par la chambre 36 puis le canal 40 et le conduit 41 pour faire retour à l'intérieur de l'enveloppe réservoir 2.In the event of overpressure in the conduit 26 leading to a device for use, this overpressure is applied by the bypass conduit 27 inside the bore 38 of the cartridge, which causes the piston 35 to slide, which discovers more or less the radial holes 37 thus allowing the fluids to pass through the chamber 36 then the channel 40 and the conduit 41 to return inside the tank envelope 2.

Le trou 39 faisant communiquer la chambre 36 avec l'intérieur de la cartouche 28 contenant le ressort 32 assure en permanence l'équilibrage de la pression.The hole 39 communicating the chamber 36 with the interior of the cartridge 28 containing the spring 32 permanently balances the pressure.

Le poussoir 33 étant relié au piston 35 formant tiroir par la bille 34, cela a pour effet que le piston 35 est toujours guidé par la paroi de l'alésage 38 de la cartouche en éliminant de ce fait tous les mouvements perturbés que pourrait subir autrement ce piston.The pusher 33 being connected to the piston 35 forming a drawer by the ball 34, this has the effect that the piston 35 is always guided by the wall of the bore 38 of the cartridge thereby eliminating all disturbed movements that could otherwise be suffered this piston.

L'invention n'est pas limitée à l'exemple de réalisation, représenté et décrit en détail, car diverses modifications peuvent y être apportées sans sortir de son cadre.The invention is not limited to the embodiment, shown and described in detail, because various modifications can be made without departing from its scope.

Claims (8)

Ensemble moteur électrique et pompe hydraulique à grande compacité dans lequel un moteur électrique (1) disposé dans une enveloppe (2) formant réservoir entraîne l'arbre d'entrée (4) d'une pompe à engrenages disposée dans un corps de pompe (8), caractérisé en ce que ledit corps de pompe forme, à partir de ses côtés latéraux et autour desdits engrenages, des chambres d'amortissement (21, 22, 23, ...) reliées en série et dans lesquelles circule le fluide hydraulique.An electric motor and a very compact hydraulic pump assembly in which an electric motor (1) arranged in a casing (2) forming a reservoir drives the input shaft (4) of a gear pump arranged in a pump body (8 ), characterized in that said pump body forms, from its lateral sides and around said gears, damping chambers (21, 22, 23, ...) connected in series and in which the hydraulic fluid circulates. Ensemble suivant la revendication 1, caractérisé en ce que le fluide hydraulique circulant dans les chambres d'amortissement (21, 22, 23, ...) est le fluide hydraulique sous haute pression.Assembly according to claim 1, characterized in that the hydraulic fluid circulating in the damping chambers (21, 22, 23, ...) is the hydraulic fluid under high pressure. Ensemble suivant l'une des revendications 1 et 2, caractérisé en ce que les chambres d'amortissement (21, 22, 23, ...) sont fermées latéralement, d'une part, au moyen d'une plaque d'interface (9) et, d'autre part, au moyen d'un plateau (12) contenant un clapet de surpression communiquant, pour son échappement, avec un conduit (41) traversant le corps de pompe et menant à l'intérieur de l'enveloppe réservoir (2) du moteur électrique (1).Assembly according to either of Claims 1 and 2, characterized in that the damping chambers (21, 22, 23, ...) are closed laterally, on the one hand, by means of an interface plate ( 9) and, on the other hand, by means of a plate (12) containing a pressure relief valve communicating, for its exhaust, with a conduit (41) passing through the pump body and leading to the interior of the casing tank (2) of the electric motor (1). Ensemble suivant l'une des revendications 1 à 3, caractérisé en ce que le clapet de surpression (13) comporte une cartouche (28) délimitant un alésage (38) pour un piston (35) formant tiroir disposé en regard de trous radiaux (37) et soumis à l'action d'un ressort de compression (32).Assembly according to one of claims 1 to 3, characterized in that the pressure relief valve (13) comprises a cartridge (28) delimiting a bore (38) for a piston (35) forming a drawer arranged opposite radial holes (37 ) and subjected to the action of a compression spring (32). Ensemble suivant l'une des revendications 1 à 4, caractérisé en ce que le piston (35) est soumis à l'action du ressort de compression (32) par l'intermédiaire d'un poussoir (33) et d'une bille (34).Assembly according to one of Claims 1 to 4, characterized in that the piston (35) is subjected to the action of the compression spring (32) by means of a pusher (33) and a ball ( 34). Ensemble suivant l'une des revendications 1 à 5, caractérisé en ce que le corps de pompe (8) est relié à la plaque d'interface (9), au moteur (1) et au plateau (12) contenant le clapet de surpression par des tirants (14) maintenant supplémentairement un anneau (15) pour la fixation de l'enveloppe (2) formant réservoir.Assembly according to one of Claims 1 to 5, characterized in that the pump body (8) is connected to the interface plate (9), to the motor (1) and to the plate (12) containing the pressure relief valve by tie rods (14) additionally holding a ring (15) for fixing the envelope (2) forming a reservoir. Ensemble suivant l'une des revendications 1 à 6, caractérisé par des goujons (10) assurant le centrage du corps de pompe (8) par rapport à la plaque d'interface (9) qui supporte l'arbre d'entrée (4) de la pompe à engrenage.Assembly according to one of Claims 1 to 6, characterized by studs (10) ensuring the centering of the pump body (8) relative to the interface plate (9) which supports the input shaft (4) of the gear pump. Ensemble moteur électrique et pompe hydraulique à grande compacité sensiblement tel que décrit et représenté aux dessins annexés.Electric motor and hydraulic pump assembly with a large compactness substantially as described and shown in the accompanying drawings.
EP96401120A 1995-06-15 1996-05-23 Electromotor-pump assembly Withdrawn EP0748939A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9507132 1995-06-15
FR9507132A FR2735534B1 (en) 1995-06-15 1995-06-15 HIGH COMPACTION ELECTRIC MOTOR AND HYDRAULIC PUMP ASSEMBLY

Publications (1)

Publication Number Publication Date
EP0748939A1 true EP0748939A1 (en) 1996-12-18

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EP96401120A Withdrawn EP0748939A1 (en) 1995-06-15 1996-05-23 Electromotor-pump assembly

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EP (1) EP0748939A1 (en)
JP (1) JPH094571A (en)
DE (1) DE748939T1 (en)
FR (1) FR2735534B1 (en)

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FR2766242A1 (en) * 1997-07-16 1999-01-22 Koyo Seiko Co Gear pump for fluids
US5961309A (en) * 1997-04-24 1999-10-05 Trw Inc. Gear pump with noise attenuation
WO2000005504A1 (en) * 1998-07-24 2000-02-03 Zf Lenksysteme Gmbh Gear pump
EP1004772A2 (en) * 1998-11-23 2000-05-31 Trw Inc. Pump having muffler
US6287090B1 (en) 1998-09-18 2001-09-11 Koyo Seiko Co., Ltd. Electric pump apparatus
EP0753666B1 (en) * 1995-07-08 2001-11-28 Robert Bosch Gmbh Gear pump
DE10249494A1 (en) * 2002-10-24 2004-05-13 Voith Turbo Gmbh & Co. Kg A motor pump assembly
EP1840376A2 (en) 2006-03-24 2007-10-03 HONDA MOTOR CO., Ltd. Oil Pump
EP1026392B2 (en) † 1999-02-04 2012-05-30 Hydroperfect International Hpi Gear pump and electric pump group having such a pump

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JP3956511B2 (en) * 1998-03-18 2007-08-08 株式会社デンソー Fuel pump
KR100523269B1 (en) * 2002-12-12 2005-10-24 임락복 Low noise external gear pump with floating gear housing
WO2008029477A1 (en) * 2006-09-08 2008-03-13 Shimadzu Corporation Gear pump

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GB1168867A (en) * 1966-03-07 1969-10-29 Borg Warner Improvements in Motor Driven Hydraulic Pump Control Systems
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GB2036873A (en) * 1978-12-01 1980-07-02 South Western Ind Res Silencing Fluid Pumps and Motors
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US2460649A (en) * 1942-03-07 1949-02-01 Geza W Muiler Gear pump with flow cushioning means
GB1168867A (en) * 1966-03-07 1969-10-29 Borg Warner Improvements in Motor Driven Hydraulic Pump Control Systems
DE2554470A1 (en) * 1975-12-04 1977-06-08 Daimler Benz Ag Gear type lubricating oil pump for IC engine - has pump wheel fixed to engine crank-shaft
GB2036873A (en) * 1978-12-01 1980-07-02 South Western Ind Res Silencing Fluid Pumps and Motors
DE3925249A1 (en) * 1988-08-22 1990-03-01 Volkswagen Ag Pump arrangement with pressure control valve - incorporates relief piston moved at low pressure level
DE4120757A1 (en) * 1990-06-25 1992-01-02 Zahnradfabrik Friedrichshafen Sliding vane fluid pump - has damping chambers in housing which reduce noise and pressure pulsations
GB2277963A (en) * 1993-05-11 1994-11-16 Barmag Luk Automobiltech Hydraulic pump outlets

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753666B1 (en) * 1995-07-08 2001-11-28 Robert Bosch Gmbh Gear pump
US5961309A (en) * 1997-04-24 1999-10-05 Trw Inc. Gear pump with noise attenuation
US6158983A (en) * 1997-04-24 2000-12-12 Trw Inc. Pump having muffler for attenuating noise
FR2766242A1 (en) * 1997-07-16 1999-01-22 Koyo Seiko Co Gear pump for fluids
US6506029B1 (en) 1998-07-24 2003-01-14 Zf Lenksysteme Gmbh Gear pump
WO2000005504A1 (en) * 1998-07-24 2000-02-03 Zf Lenksysteme Gmbh Gear pump
US6287090B1 (en) 1998-09-18 2001-09-11 Koyo Seiko Co., Ltd. Electric pump apparatus
EP1004772A2 (en) * 1998-11-23 2000-05-31 Trw Inc. Pump having muffler
EP1004772A3 (en) * 1998-11-23 2002-07-17 Trw Inc. Pump having muffler
EP1026392B2 (en) † 1999-02-04 2012-05-30 Hydroperfect International Hpi Gear pump and electric pump group having such a pump
DE10249494A1 (en) * 2002-10-24 2004-05-13 Voith Turbo Gmbh & Co. Kg A motor pump assembly
EP1840376A2 (en) 2006-03-24 2007-10-03 HONDA MOTOR CO., Ltd. Oil Pump
EP1840376A3 (en) * 2006-03-24 2008-09-24 HONDA MOTOR CO., Ltd. Oil Pump
CN101042134B (en) * 2006-03-24 2012-02-01 本田技研工业株式会社 Oil pump

Also Published As

Publication number Publication date
JPH094571A (en) 1997-01-07
DE748939T1 (en) 1997-07-10
FR2735534B1 (en) 1997-08-29
FR2735534A1 (en) 1996-12-20

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