EP0761970A1 - Compact electrohydraulic apparatus - Google Patents

Compact electrohydraulic apparatus Download PDF

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Publication number
EP0761970A1
EP0761970A1 EP96401657A EP96401657A EP0761970A1 EP 0761970 A1 EP0761970 A1 EP 0761970A1 EP 96401657 A EP96401657 A EP 96401657A EP 96401657 A EP96401657 A EP 96401657A EP 0761970 A1 EP0761970 A1 EP 0761970A1
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EP
European Patent Office
Prior art keywords
electro
unit according
pump body
pump
hydraulic unit
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Granted
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EP96401657A
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German (de)
French (fr)
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EP0761970B1 (en
Inventor
Jean-Yves Ollivier Vourc'h
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Hydroperfect International Inc
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Hydroperfect International Inc
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    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • 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 invention relates to electro-hydraulic groups in which an electric motor drives a hydraulic pump for supplying circuits of various uses.
  • the invention relates more particularly to an electro-hydraulic group intended to supply hydraulic receivers of the type used in the automobile industry and in particular for assisting the management of these vehicles.
  • the embodiment of the invention relates more particularly to so-called compact groups which are sealed groups in which the assembly, hydraulic pump and motor, is contained in a sealed envelope also serving as a fluid reservoir.
  • the invention aims to reduce, even eliminate, the noise resulting from the operation of an electro-hydraulic group and provides that in the event of a breakdown of the vehicle's electrical circuit the presence of the electro-hydraulic control group does not not prevent free operation of the servo circuit, in particular of the vehicle steering circuit.
  • the compact electro-hydraulic group in which an electric motor drives a hydraulic pump, the pump body of which has cavities for damping sound waves partially surrounding at least the cavity containing the pump pinions is characterized in that at least some of the cavities communicate, by a lateral face of the pump body, with a chamber of a cover leading to a fitting of the operating circuit.
  • Fig. 1 is a partially schematic partial sectional elevation of the compact electro-hydraulic group of the invention, the section being taken along line I-I of FIG. 4.
  • Fig. 2 is a section, similar to FIG. 1, but seen along line II-II of FIG. 4.
  • Fig. 3 is a section similar to the previous figures but taken along line III-III of FIG. 4.
  • Fig. 4 is a section seen along line IV-IV of FIG. 1.
  • Fig. 5 is a section seen substantially along the plane V of FIG. 1.
  • Fig. 6 is a view similar to FIG. 5 but illustrating an additional characteristic of the invention.
  • Fig. 7 is a partial sectional elevation similar to FIG. 3 of the pump of the electro-hydraulic group illustrating a development of the invention.
  • the motor-pump unit comprises an electric motor 1 of which only the casing is silhouetted and a hydraulic pump 2 of which the input shaft 3 is driven by the motor 1 by means of a coupling 4.
  • the input shaft 3 as well as the driven shaft 5 of the pump 2 are mounted in bearings 6, 7 movable relative to the shafts 3 and 5 above by a device called hydrostatic compensation of which only linings 8 are represented.
  • the shafts 3 and 5 are provided with engaged pinions 9, 10 housed in a cavity 11 of the pump body 12.
  • the pump body 12 is made in a single piece, for example of aluminum alloy, and has, on either side of the cavity 11, two through holes 13, 14 for the installation of tightening bolts 15 now side cheeks 16, 17 against the two faces of the pump body 12, that is to say ensuring the cohesion of the pump outside of the assembly of the latter to the motor.
  • the side cheeks are made of material with a high modulus of elasticity, for example steel, in order to have a thickness as small as possible taking into account the forces which they have to bear.
  • Fig. 3 shows that the tightening bolts 15 ensure the junction not only of the cheeks 16, 17 on either side of the body 12 as well as the fixing of a cover 18 delimiting, opposite the cheek 17, a chamber 19 in which the fluid under high pressure, driven back by the pistons 9, 10, is brought through a lumen 20 of the cheek 17.
  • the cheek 16 held by the tightening bolts 15 is, moreover, centered on the pump body 12 by pins 21 and the free face of the cheek 16 has a crown 22 projecting, to ensure the centering of the motor 1 which is fixed to the pump body 12 by bolts 23 passed through through holes 24 of the body 12, these holes as well as the bolts being clearly visible in particular in FIGS. 2, 5 and 6.
  • the pump body 12 has, between the cavity 11 containing the pinions 9, 10 and its periphery, a housing 25 passing right through it in which is disposed the cartridge 26 of a pressure relief valve 27 (fig. 1) whose the piston 28 pushed by a calibration spring 29 is in communication by a bore 30 with the chamber 19 in which the fluid is discharged under high pressure.
  • a pressure relief valve 27 (fig. 1) whose the piston 28 pushed by a calibration spring 29 is in communication by a bore 30 with the chamber 19 in which the fluid is discharged under high pressure.
  • Fig. 1 shows that the pressure relief valve crosses the cheek 17.
  • the piston 28 of the pressure relief valve 27 controls the opening of discharge channels 31 leading to the interior of the cavity 25 which is in communication with the interior of an envelope 32 forming a reservoir via a light 33 (fig. 1).
  • the pump body 12 has, in its face facing the cheek 17, cavities such as 34, 35 and 36 which surround the cavity 11 containing the pinions 9, 10 of the pump. These cavities, which communicate with the chamber 19 of fluid under high pressure, constitute cavities ensuring the damping of the sound waves generated by the operation of the pump.
  • At least some of the cavities 34, 35, 36 can be connected together to cause circulation of the fluid under high pressure which they contain.
  • the pump body 12 comprises an intake duct 37 which leads to the cavity 11 containing the pinions (fig. 5) and which opens inside the casing 32 filled with fluid under low pressure.
  • the pump body 12 delimits a channel 38 opening in one of the so-called Helmholtz cavities, in this case the cavity 34, and leading by a conduit 39 inside the envelope 32.
  • a non-return valve 40 consisting of a ball, a spring and a retaining member is disposed in the channel 38 and is held against its seat by the pressure prevailing in the cavity 34 in communication with the chamber 19 of the cover 18.
  • the channel 38 and the non-return valve 40 constitute a bypass path for the fluid between the low pressure and high pressure circuits, which makes it possible, if necessary, to use a fluid receiving mechanism in the event of a failure. power supply to the pump drive electric motor. Indeed, the circulation between the low pressure and high pressure circuits which can be established by the non-return valve 40 makes it possible to avoid a blockage as could occur with regard to the receiving mechanism which could not be operated manually if the high pressure circuit cannot be supplied by the low pressure circuit.
  • the implementation of the conduit 41 has the effect of further improving the damping of the sound waves generated by the operation of the pump.
  • the pump has great compactness since it is the pump body which delimits all the cavities necessary for fitting both the pinions and the damping chambers of the pressure relief valve and inlet and outlet conduits, this pump body being closed by thin cheeks, which ensures a very compact overall.
  • the hydraulic assembly thus constitutes a unit to which the electric motor 1 is then fixed by the installation of bolts 23 which contribute to ensuring the sealing functions of the pump as illustrated in FIG. 2.
  • the assembly, hydraulic unit - hydraulic motor is then engaged inside the casing 32.
  • the cover 18 forms a fitting 42 on which the casing 32 is engaged, the sealing being ensured by an O-ring 43.
  • the fitting 42 is preferably provided so as to allow rapid connection with a mounting bracket.
  • the threaded bore 44 allows the attachment of a supply pipe to a receiver.
  • the embodiment according to fig. 7 shows that the cheek 17 delimits two chambers 19 and 34.
  • the pump begins in chambers 19 and 34 by calibrated channels 20, 45 and 46 that designated by 20 corresponding to the actual discharge of the pump.
  • the flow is then carried out by the high pressure outlet of the bore 44 by an additional calibrated channel 47.
  • the distribution of the volume in two high pressure chambers 19 and 34 makes it possible, by adjusting the channels or lights 20, 45, 46 and 47, to reduce the pressure pulsations generated by the pinions, pressure pulses which are thus damped due to communications multiples produced between the damping chambers and between the discharge parts of the pinions and the damping chambers.

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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)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Motors (AREA)

Abstract

The assembly comprises an electric motor which drives a hydraulic pump feeding a number of different circuits consisting of a pump housing with a series of sound wave damping cavities (36) surrounding the chamber (11) containing the pump gears (9,10), and at least some of the cavities are connected via the pump's lateral face with a chamber (19) inside the cover (18) and a coupling (42) for the utilisation circuit (44). The pump body (12), its side plates (16,17) and the cover (18) are held together by bolts and centering pins (21) to form a single unit. The side plates are made from a material with a high module of elasticity, especially steel.

Description

L'invention concerne les groupes électro-hydrauliques dans lesquels un moteur électrique entraîne une pompe hydraulique pour l'alimentation de circuits d'utilisation divers.The invention relates to electro-hydraulic groups in which an electric motor drives a hydraulic pump for supplying circuits of various uses.

L'invention concerne plus particulièrement un groupe électro-hydraulique destiné à alimenter des récepteurs hydrauliques du genre de ceux qui sont utilisés dans l'industrie automobile et notamment pour l'assistance de la direction de ces véhicules.The invention relates more particularly to an electro-hydraulic group intended to supply hydraulic receivers of the type used in the automobile industry and in particular for assisting the management of these vehicles.

La réalisation de l'invention concerne plus particulièrement encore des groupes dits compacts qui sont des groupes étanches dans lesquels l'ensemble, pompe hydraulique et moteur, est contenu dans une enveloppe étanche servant également de réservoir de fluide.The embodiment of the invention relates more particularly to so-called compact groups which are sealed groups in which the assembly, hydraulic pump and motor, is contained in a sealed envelope also serving as a fluid reservoir.

Il est apparu pour permettre une mise en place facile dans des véhicules automobiles que l'ensemble hydraulique devait être rendu aussi étroit que possible pour pouvoir être logé dans une enveloppe de faible volume pouvant être montée facilement dans des emplacements exigus laissés libres sous un capot de moteur de véhicule.It appeared to allow easy installation in motor vehicles that the hydraulic assembly had to be made as narrow as possible to be able to be housed in a small volume envelope which could be easily mounted in cramped locations left free under a hood. vehicle engine.

En outre, l'invention vise à réduire, voir à annihiler, les bruits résultant du fonctionnement d'un groupe électro-hydraulique et prévoit qu'en cas de panne du circuit électrique du véhicule la présence du groupe de commande électro-hydraulique n'empêche pas la manoeuvre libre du circuit asservi, notamment du circuit de direction du véhicule.In addition, the invention aims to reduce, even eliminate, the noise resulting from the operation of an electro-hydraulic group and provides that in the event of a breakdown of the vehicle's electrical circuit the presence of the electro-hydraulic control group does not not prevent free operation of the servo circuit, in particular of the vehicle steering circuit.

Conformément à l'invention, le groupe électro-hydraulique compact dans lequel un moteur électrique entraîne une pompe hydraulique dont le corps de pompe comporte des cavités d'amortissement des ondes sonores entourant partiellement au moins la cavité contenant les pignons de la pompe est caractérisé en ce que certaines au moins des cavités communiquent, par une face latérale du corps de pompe, avec une chambre d'un couvercle menant à un raccord du circuit d'utilisation.According to the invention, the compact electro-hydraulic group in which an electric motor drives a hydraulic pump, the pump body of which has cavities for damping sound waves partially surrounding at least the cavity containing the pump pinions is characterized in that at least some of the cavities communicate, by a lateral face of the pump body, with a chamber of a cover leading to a fitting of the operating circuit.

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.

Des formes de réalisation de l'objet de l'invention sont représentées, à titre d'exemples non limitatifs, au dessin annexé.Embodiments of the subject of the invention are shown, by way of nonlimiting examples, in the accompanying drawing.

La fig. 1 est une coupe-élévation partielle en partie schématique du groupe électro-hydraulique compact de l'invention, la coupe étant prise suivant la ligne I-I de la fig.4 .Fig. 1 is a partially schematic partial sectional elevation of the compact electro-hydraulic group of the invention, the section being taken along line I-I of FIG. 4.

La fig. 2 est une coupe, analogue à la fig. 1, mais vue suivant la ligne II-II de la fig. 4.Fig. 2 is a section, similar to FIG. 1, but seen along line II-II of FIG. 4.

La fig. 3 est une coupe analogue aux figures précédentes mais prise suivant la ligne III-III de la fig. 4.Fig. 3 is a section similar to the previous figures but taken along line III-III of FIG. 4.

La fig. 4 est une coupe vue selon la ligne IV-IV de la fig. 1.Fig. 4 is a section seen along line IV-IV of FIG. 1.

La fig. 5 est une coupe vue sensiblement suivant le plan V de la fig. 1.Fig. 5 is a section seen substantially along the plane V of FIG. 1.

La fig. 6 est une vue analogue à la fig. 5 mais illustrant une caractéristique supplémentaire de l'invention.Fig. 6 is a view similar to FIG. 5 but illustrating an additional characteristic of the invention.

La fig. 7 est une coupe-élévation partielle analogue à la fig. 3 de la pompe du groupe électro-hydraulique illustant un développement de l'invention.Fig. 7 is a partial sectional elevation similar to FIG. 3 of the pump of the electro-hydraulic group illustrating a development of the invention.

Le groupe moto-pompe comprend un moteur électrique 1 dont seule l'enveloppe est silhouettée et une pompe hydraulique 2 dont l'arbre d'entrée 3 est entraîné par le moteur 1 au moyen d'un accouplement 4.The motor-pump unit comprises an electric motor 1 of which only the casing is silhouetted and a hydraulic pump 2 of which the input shaft 3 is driven by the motor 1 by means of a coupling 4.

L'arbre d'entrée 3 de même que l'arbre mené 5 de la pompe 2 sont montés dans des paliers 6, 7 déplaçables par rapport aux arbres 3 et 5 ci-dessus par un dispositif dit de compensation hydrostatique dont seules des garnitures 8 sont représentées.The input shaft 3 as well as the driven shaft 5 of the pump 2 are mounted in bearings 6, 7 movable relative to the shafts 3 and 5 above by a device called hydrostatic compensation of which only linings 8 are represented.

Les dispositifs de compensation hydrostatiques étant bien connus dans la technique des pompes et moteurs hydrauliques ne sont pas décrits plus en détail dans la présente description.Hydrostatic compensation devices being well known in the art of hydraulic pumps and motors are not described in more detail in the present description.

Les arbres 3 et 5 sont munis de pignons en prise 9, 10 logés dans une cavité 11 du corps de pompe 12.The shafts 3 and 5 are provided with engaged pinions 9, 10 housed in a cavity 11 of the pump body 12.

Le corps de pompe 12 est réalisé en une seule pièce, par exemple en alliage d'aluminium, et présente, de part et d'autre de la cavité 11, deux trous traversants 13, 14 pour la mise en place de boulons de serrage 15 maintenant des joues latérales 16, 17 contre les deux faces du corps de pompe 12, c'est-à-dire assurant la cohésion de la pompe en dehors de l'assemblage de cette dernière au moteur.The pump body 12 is made in a single piece, for example of aluminum alloy, and has, on either side of the cavity 11, two through holes 13, 14 for the installation of tightening bolts 15 now side cheeks 16, 17 against the two faces of the pump body 12, that is to say ensuring the cohesion of the pump outside of the assembly of the latter to the motor.

Les joues latérales sont réalisées en matière à haut module d'élasticité, par exemple en acier, pour présenter une épaisseur aussi faible que possible compte tenu des efforts qu'elles doivent supporter.The side cheeks are made of material with a high modulus of elasticity, for example steel, in order to have a thickness as small as possible taking into account the forces which they have to bear.

La fig. 3 montre que les boulons de serrage 15 assurent la jonction non seulement des joues 16, 17 de part et d'autre du corps 12 ainsi que la fixation d'un couvercle 18 délimitant, en regard de la joue 17, une chambre 19 dans laquelle le fluide sous haute pression, refoulé par les pistons 9, 10, est amené à travers une lumière 20 de la joue 17.Fig. 3 shows that the tightening bolts 15 ensure the junction not only of the cheeks 16, 17 on either side of the body 12 as well as the fixing of a cover 18 delimiting, opposite the cheek 17, a chamber 19 in which the fluid under high pressure, driven back by the pistons 9, 10, is brought through a lumen 20 of the cheek 17.

La joue 16 maintenue par les boulons de serrage 15 est, par ailleurs, centrée sur le corps de pompe 12 par des pions 21 et la face libre de la joue 16 présente une couronne 22 faisant saillie, pour assurer le centrage du moteur 1 qui est fixé au corps de pompe 12 par des boulons 23 passés par des trous traversants 24 du corps 12, ces trous de même que les boulons étant bien visibles en particulier aux fig. 2, 5 et 6.The cheek 16 held by the tightening bolts 15 is, moreover, centered on the pump body 12 by pins 21 and the free face of the cheek 16 has a crown 22 projecting, to ensure the centering of the motor 1 which is fixed to the pump body 12 by bolts 23 passed through through holes 24 of the body 12, these holes as well as the bolts being clearly visible in particular in FIGS. 2, 5 and 6.

Le corps de pompe 12 présente, entre la cavité 11 contenant les pignons 9, 10 et sa périphérie, un logement 25 le traversant de part en part dans lequel est disposée la cartouche 26 d'un clapet de surpression 27 (fig. 1) dont le piston 28 poussé par un ressort de tarage 29 est en communication par un alésage 30 avec la chambre 19 dans laquelle est refoulé le fluide sous haute pression.The pump body 12 has, between the cavity 11 containing the pinions 9, 10 and its periphery, a housing 25 passing right through it in which is disposed the cartridge 26 of a pressure relief valve 27 (fig. 1) whose the piston 28 pushed by a calibration spring 29 is in communication by a bore 30 with the chamber 19 in which the fluid is discharged under high pressure.

La fig. 1 montre que le clapet de surpression traverse la joue 17.Fig. 1 shows that the pressure relief valve crosses the cheek 17.

Le piston 28 du clapet de surpression 27 commande l'ouverture de canaux de décharge 31 menant à l'intérieur de la cavité 25 qui est en communication avec l'intérieur d'une enveloppe 32 formant réservoir par l'intermédiaire d'une lumière 33 (fig. 1).The piston 28 of the pressure relief valve 27 controls the opening of discharge channels 31 leading to the interior of the cavity 25 which is in communication with the interior of an envelope 32 forming a reservoir via a light 33 (fig. 1).

Le corps de pompe 12 présente, dans sa face tournée vers la joue 17, des cavités telles que 34, 35 et 36 qui entourent la cavité 11 contenant les pignons 9, 10 de la pompe. Ces cavités, qui communiquent avec la chambre 19 de fluide sous haute pression, constituent des cavités assurant l'amortissement des ondes sonores générées par le fonctionnement de la pompe.The pump body 12 has, in its face facing the cheek 17, cavities such as 34, 35 and 36 which surround the cavity 11 containing the pinions 9, 10 of the pump. These cavities, which communicate with the chamber 19 of fluid under high pressure, constitute cavities ensuring the damping of the sound waves generated by the operation of the pump.

Si on le désire, certaines au moins des cavités 34, 35, 36 peuvent être reliées ensemble pour provoquer une circulation du fluide sous haute pression qu'elles contiennent.If desired, at least some of the cavities 34, 35, 36 can be connected together to cause circulation of the fluid under high pressure which they contain.

Le corps de pompe 12 comprend un conduit d'admission 37 qui mène à la cavité 11 contenant les pignons (fig. 5) et qui ouvre à l'intérieur de l'enveloppe 32 remplie de fluide sous basse pression.The pump body 12 comprises an intake duct 37 which leads to the cavity 11 containing the pinions (fig. 5) and which opens inside the casing 32 filled with fluid under low pressure.

Supplémentairement encore, le corps de pompe 12 délimite un canal 38 ouvrant dans l'une des cavités dites de Helmholtz, en l'occurrence la cavité 34, et menant par un conduit 39 à l'intérieur de l'enveloppe 32.Additionally still, the pump body 12 delimits a channel 38 opening in one of the so-called Helmholtz cavities, in this case the cavity 34, and leading by a conduit 39 inside the envelope 32.

Un clapet anti-retour 40 constitué par une bille, un ressort et un organe de retenue est disposé dans le canal 38 et est maintenu contre son siège par la pression régnant dans la cavité 34 en communication avec la chambre 19 du couvercle 18.A non-return valve 40 consisting of a ball, a spring and a retaining member is disposed in the channel 38 and is held against its seat by the pressure prevailing in the cavity 34 in communication with the chamber 19 of the cover 18.

Le canal 38 et le clapet anti-retour 40 constituent un trajet de dérivation pour le fluide entre les circuits de basse pression et de haute pression, ce qui permet, le cas échéant, d'utiliser un mécanisme récepteur de fluide en cas de panne d'alimentation du moteur électrique d'entraînement de la pompe. En effet, la circulation entre les circuits de basse pression et de haute pression qui peut s'établir par le clapet anti-retour 40 permet d'éviter un blocage comme cela pourrait se produire en ce qui concerne le mécanisme récepteur qui ne pourrait pas être manoeuvré manuellement si le circuit haute pression ne parvient pas à être alimenté par le circuit basse pression.The channel 38 and the non-return valve 40 constitute a bypass path for the fluid between the low pressure and high pressure circuits, which makes it possible, if necessary, to use a fluid receiving mechanism in the event of a failure. power supply to the pump drive electric motor. Indeed, the circulation between the low pressure and high pressure circuits which can be established by the non-return valve 40 makes it possible to avoid a blockage as could occur with regard to the receiving mechanism which could not be operated manually if the high pressure circuit cannot be supplied by the low pressure circuit.

A titre de variante, il a été estimé avantageux, comme l'illustre la fig. 6, de prévoir un conduit souple par exemple un conduit annelé 41 entourant le corps de pompe et reliant le conduit 37 d'admission à l'intérieur de l'enveloppe 32.As a variant, it has been considered advantageous, as illustrated in FIG. 6, to provide a flexible conduit for example a ringed duct 41 surrounding the pump body and connecting the inlet duct 37 inside the casing 32.

La mise en oeuvre du conduit 41 a pour effet d'améliorer encore l'amortissement des ondes sonores engendrées par le fonctionnement de la pompe.The implementation of the conduit 41 has the effect of further improving the damping of the sound waves generated by the operation of the pump.

Comme cela ressort de la description qui précède, la pompe présente une grande compacité étant donné que c'est le corps de pompe qui délimite toutes les cavités nécessaires à la mise en place tant des pignons que des chambres d'amortissement du clapet de surpression et des conduits d'admission et de refoulement, ce corps de pompe étant fermé par des joues minces, ce qui assure une très grande compacité à l'ensemble.As can be seen from the above description, the pump has great compactness since it is the pump body which delimits all the cavities necessary for fitting both the pinions and the damping chambers of the pressure relief valve and inlet and outlet conduits, this pump body being closed by thin cheeks, which ensures a very compact overall.

Par ailleurs, en ce qui concerne le montage, celui-ci est très simplifié par la réalisation décrite.Furthermore, with regard to the mounting, this is very simplified by the embodiment described.

En effet, après mise en place des pignons 9, 10 dans leurs coussinets 6, 7 et mise en place du clapet de surpression 27 et du clapet anti-retour 40, les joues sont serrées contre les côtés latéraux du corps de pompe 12 par les boulons de serrage 15 qui assurent simultanément le serrage et la fixation du couvercle 18 délimitant la chambre à haute pression 19.In fact, after the pinions 9, 10 have been placed in their bearings 6, 7 and the pressure relief valve 27 and the non-return valve 40 have been put in place, the cheeks are clamped against the lateral sides of the pump body 12 by the tightening bolts 15 which simultaneously tighten and fix the cover 18 delimiting the high-pressure chamber 19.

L'ensemble hydraulique constitue ainsi une unité à laquelle le moteur électrique 1 est ensuite fixé par la mise en place des boulons 23 qui contribuent à assurer les fonctions d'étanchéité de la pompe comme illustré par la fig. 2. L'ensemble, unité hydraulique - moteur hydraulique est ensuite engagé à l'intérieur de l'enveloppe 32.The hydraulic assembly thus constitutes a unit to which the electric motor 1 is then fixed by the installation of bolts 23 which contribute to ensuring the sealing functions of the pump as illustrated in FIG. 2. The assembly, hydraulic unit - hydraulic motor is then engaged inside the casing 32.

Il est avantageux, comme l'illustrent les fig. 1 à 3, que le couvercle 18 forme un raccord 42 sur lequel l'enveloppe 32 est engagée, l'étanchéité étant assurée par un joint torique 43. Le raccord 42 est, de préférence, prévu de façon à permettre la liaison rapide avec un support de fixation. L'alésage taraudé 44 permet la fixation d'un tuyau d'alimentation d'un récepteur.It is advantageous, as illustrated in FIGS. 1 to 3, that the cover 18 forms a fitting 42 on which the casing 32 is engaged, the sealing being ensured by an O-ring 43. The fitting 42 is preferably provided so as to allow rapid connection with a mounting bracket. The threaded bore 44 allows the attachment of a supply pipe to a receiver.

La réalisation selon la fig. 7 montre que la joue 17 délimite deux chambres 19 et 34. La pompe débute dans les chambres 19 et 34 par des canaux calibrés 20, 45 et 46 celui désigné par 20 correspondant au refoulement proprement dit de la pompe.The embodiment according to fig. 7 shows that the cheek 17 delimits two chambers 19 and 34. The pump begins in chambers 19 and 34 by calibrated channels 20, 45 and 46 that designated by 20 corresponding to the actual discharge of the pump.

Le débit s'effectue ensuite par la sortie haute pression de l'alésage 44 par un canal calibré supplémentaire 47.The flow is then carried out by the high pressure outlet of the bore 44 by an additional calibrated channel 47.

La répartition du volume en deux chambres haute pression 19 et 34 permet, par ajustement des canaux ou lumières 20, 45, 46 et 47, de réduire les pulsations de pression engendrées par les pignons, pulsations de pression qui sont ainsi amorties du fait des communications multiples réalisées entre les chambres d'amortissement et entre les parties de refoulement des pignons et les chambres d'amortissement.The distribution of the volume in two high pressure chambers 19 and 34 makes it possible, by adjusting the channels or lights 20, 45, 46 and 47, to reduce the pressure pulsations generated by the pinions, pressure pulses which are thus damped due to communications multiples produced between the damping chambers and between the discharge parts of the pinions and the damping chambers.

L'invention n'est pas limitée aux exemples de réalisation, représentés et décrits en détail, car diverses modifications peuvent y être apportées sans sortir de son cadre.The invention is not limited to the exemplary embodiments, shown and described in detail, since various modifications can be made thereto without departing from its scope.

Claims (14)

Groupe électro-hydraulique compact dans lequel un moteur électrique entraîne une pompe hydraulique dont le corps de pompe comporte des cavités d'amortissement des ondes sonores entourant partiellement au moins la cavité contenant les pignons de la pompe, caractérisé en ce que certaines au moins des cavités communiquent par une face latérale du corps de pompe (12) avec une chambre (19) d'un couvercle (18) menant à un raccord (42) du circuit d'utilisation (44).Compact electro-hydraulic group in which an electric motor drives a hydraulic pump, the pump body of which contains sound-absorbing cavities at least partially surrounding the cavity containing the pump gears, characterized in that at least some of the cavities communicate via a lateral face of the pump body (12) with a chamber (19) of a cover (18) leading to a connector (42) of the operating circuit (44). Groupe électro-hydraulique suivant la revendication 1, caractérisé en ce qu'une au moins des cavités d'amortissement est constituée de deux chambres (19, 34) prévues dans le circuit haute pression et qui sont séparées par une joue (17), des canaux étant prévus dans ladite joue.Electro-hydraulic unit according to claim 1, characterized in that at least one of the damping cavities consists of two chambers (19, 34) provided in the high pressure circuit and which are separated by a cheek (17), channels being provided in said cheek. Groupe électro-hydraulique suivant la revendication 1, caractérisé par des lumières calibrés (20, 45, 46, 47) faisant partie du circuit de refoulement haute pression et mettant en communication les chambres d'amortissement et la sortie haute pression pour réduire les pulsations de pression engendrées par la pompe.Electro-hydraulic unit according to claim 1, characterized by calibrated lights (20, 45, 46, 47) forming part of the high pressure delivery circuit and connecting the damping chambers and the high pressure outlet to reduce the pulsations of pressure generated by the pump. Groupe électro-hydraulique suivant la revendication 1, caractérisé en ce qu'un logement (25) est prévu dans le corps de pompe entre la cavité (11) contenant les pignons (9, 10) et la périphérie de ce corps pour contenir une cartouche de surpression (26).Electro-hydraulic unit according to claim 1, characterized in that a housing (25) is provided in the pump body between the cavity (11) containing the pinions (9, 10) and the periphery of this body to contain a cartridge overpressure (26). Groupe électro-hydraulique suivant l'une des revendications 1 à 4, caractérisé en ce que l'une des cavités (34) pour l'amortissement des ondes sonores communique, d'une part, avec la chambre haute pression (19) du couvercle (18) et, d'autre part, avec un conduit (39) menant au circuit de basse pression par l'intermédiaire d'un clapet anti-retour (40) disposé dans un canal (38) formant circuit de dérivation.Electro-hydraulic unit according to one of Claims 1 to 4, characterized in that one of the cavities (34) for damping the sound waves communicates, on the one hand, with the high pressure chamber (19) of the cover (18) and, on the other hand, with a conduit (39) leading to the circuit low pressure by means of a non-return valve (40) disposed in a channel (38) forming a bypass circuit. Groupe électro-hydraulique suivant l'une des revendications 1 à 5, caractérisé en ce que le corps de pompe (12) est maintenu sur chacun de ses côtés latéraux par des joues latérales (16, 17) formant organes de retenue pour des paliers (6, 7) de support des arbres (3, 5), des pignons (9, 10) et des garnitures (8) de dispositifs de compensation hydrostatique.Electro-hydraulic unit according to one of Claims 1 to 5, characterized in that the pump body (12) is held on each of its lateral sides by lateral cheeks (16, 17) forming retaining members for bearings ( 6, 7) for supporting the shafts (3, 5), the pinions (9, 10) and the linings (8) of hydrostatic compensation devices. Groupe électro-hydraulique suivant l'une des revendications 1 à 6, caractérisé en ce que l'ensemble corps de pompe (12), joues latérales (16, 17) et couvercle (18) est maintenu par des boulons (15) et des pions de centrage (21) pour constituer une unité.Electro-hydraulic unit according to one of claims 1 to 6, characterized in that the pump body (12), side cheeks (16, 17) and cover (18) assembly is held by bolts (15) and centering pins (21) to constitute a unit. Groupe électro-hydraulique suivant la revendication 7, caractérisé en ce que l'ensemble, corps de pompe (12), joues latérales (16, 17) et couvercle (18), présente, sur l'une des joues latérales (16) une couronne de centrage (22) pour le moteur électrique (1) fixé audit ensemble par des boulons (23) traversant le couvercle, les joues latérales (16, 17) et le corps de pompe (12), boulons qui sont fixés dans ledit moteur (1).Electro-hydraulic unit according to claim 7, characterized in that the assembly, pump body (12), side cheeks (16, 17) and cover (18), has, on one of the side cheeks (16) a centering ring (22) for the electric motor (1) fixed to said assembly by bolts (23) passing through the cover, the side cheeks (16, 17) and the pump body (12), bolts which are fixed in said motor (1). Groupe électro-hydraulique suivant l'une des revendications 1 à 8, caractérisé en ce qu'un conduit d'admission (37) percé dans le corps de pompe (12) pour amener le fluide à la cavité (11) contenant les pignons (9, 10) ouvre dans une enveloppe (32) formant réservoir contenant la pompe et le moteur électrique.Electro-hydraulic unit according to one of Claims 1 to 8, characterized in that an intake duct (37) pierced in the pump body (12) to bring the fluid to the cavity (11) containing the pinions ( 9, 10) opens in an envelope (32) forming a reservoir containing the pump and the electric motor. Groupe électro-hydraulique suivant l'une des revendications 1 à 9, caractérisé en ce que le conduit d'admission (37) du corps de pompe est relié à un conduit (41) entourant le corps de pompe et ouvrant à l'intérieur de l'enveloppe (32) contenant le fluide sous basse pression.Electro-hydraulic unit according to one of the claims 1 to 9, characterized in that the intake duct (37) of the pump body is connected to a duct (41) surrounding the pump body and opening inside the casing (32) containing the fluid under low pressure. Groupe électro-hydraulique suivant l'une des revendications 1 à 10, caractérisé en ce que les joues latérales (16, 17) maintenant le corps de pompe sont réalisées en matière à haut module d'élasticité, notamment en acier.Electro-hydraulic unit according to one of claims 1 to 10, characterized in that the lateral cheeks (16, 17) holding the pump body are made of material with high elasticity modulus, in particular steel. Groupe électro-hydraulique suivant l'une des revendications 1 à 11, caractérisé en ce que le couvercle (18) présente un raccord (42) engagé dans une extrémité de l'enveloppe (32) à laquelle ce raccord est relié par un joint d'étanchéité torique (43).Electro-hydraulic unit according to one of Claims 1 to 11, characterized in that the cover (18) has a connection (42) engaged in one end of the casing (32) to which this connection is connected by a seal d '' O-ring (43). Groupe électro-hydraulique suivant l'une des revendications 1 à 12, caractérisé en ce que le raccord (42) est prévu pour recevoir un tuyau d'alimentation (44).Electro-hydraulic unit according to one of claims 1 to 12, characterized in that the connector (42) is designed to receive a supply pipe (44). Groupe électro-hydraulique sensiblement tel que décrit et représenté aux dessins annexés.Electro-hydraulic group substantially as described and shown in the accompanying drawings.
EP96401657A 1995-08-30 1996-07-25 Compact electrohydraulic apparatus Expired - Lifetime EP0761970B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510219 1995-08-30
FR9510219A FR2738302B1 (en) 1995-08-30 1995-08-30 COMPACT ELECTRO-HYDRAULIC GROUP

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EP0761970A1 true EP0761970A1 (en) 1997-03-12
EP0761970B1 EP0761970B1 (en) 1999-01-07

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US (1) US5692883A (en)
EP (1) EP0761970B1 (en)
JP (1) JP4115548B2 (en)
CN (1) CN1146963A (en)
AR (1) AR003377A1 (en)
BR (1) BR9603535A (en)
DE (2) DE69601290C5 (en)
ES (1) ES2127609T3 (en)
FR (1) FR2738302B1 (en)

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DE19833372A1 (en) * 1998-07-24 2000-01-27 Zahnradfabrik Friedrichshafen Gear pump for vehicle power steering, integrated in casing and surrounded by absorber cavity and induction cavity
DE102004021885A1 (en) * 2004-05-04 2005-12-01 Zf Lenksysteme Gmbh Rotary hydraulic pump has return flow connection connected to suction connection via connecting passage on reservoir side, and pressure limiting device discharges into collecting chamber on reservoir side
WO2006111314A1 (en) * 2005-04-21 2006-10-26 Trw Automotive Gmbh Motor/pump unit, particularly for a vehicle power steering system
EP1026392B2 (en) † 1999-02-04 2012-05-30 Hydroperfect International Hpi Gear pump and electric pump group having such a pump
WO2016062538A1 (en) * 2014-10-21 2016-04-28 Magna Powertrain Bad Homburg GmbH Device for compensating pressure

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US6419042B1 (en) 2000-10-03 2002-07-16 Trw Inc. Integrated electric power hydraulic steering system
US7124775B2 (en) * 2003-02-05 2006-10-24 Neng-Chao Chang Micro pump device with liquid tank
US8122867B2 (en) * 2008-11-17 2012-02-28 GM Global Technology Operations LLC Engine with oil pump muffler and noise damper
CN107867323B (en) * 2016-09-28 2019-11-22 比亚迪股份有限公司 Motor pump assembly, steering system and vehicle
CN106438341B (en) * 2016-10-21 2018-11-02 珠海格力电器股份有限公司 Pump and method of operating the same

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WO2016062538A1 (en) * 2014-10-21 2016-04-28 Magna Powertrain Bad Homburg GmbH Device for compensating pressure

Also Published As

Publication number Publication date
FR2738302B1 (en) 1997-10-10
EP0761970B1 (en) 1999-01-07
DE761970T1 (en) 1997-09-11
FR2738302A1 (en) 1997-03-07
DE69601290C5 (en) 2010-10-28
DE69601290T2 (en) 1999-06-02
US5692883A (en) 1997-12-02
ES2127609T3 (en) 1999-04-16
JP4115548B2 (en) 2008-07-09
AR003377A1 (en) 1998-07-08
BR9603535A (en) 1998-05-12
JPH09105385A (en) 1997-04-22
DE69601290D1 (en) 1999-02-18
CN1146963A (en) 1997-04-09

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