EP0761970B1 - Compact electrohydraulic apparatus - Google Patents
Compact electrohydraulic apparatus Download PDFInfo
- Publication number
- EP0761970B1 EP0761970B1 EP96401657A EP96401657A EP0761970B1 EP 0761970 B1 EP0761970 B1 EP 0761970B1 EP 96401657 A EP96401657 A EP 96401657A EP 96401657 A EP96401657 A EP 96401657A EP 0761970 B1 EP0761970 B1 EP 0761970B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump body
- pump
- electrohydraulic apparatus
- electrohydraulic
- cover
- 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.)
- Expired - Lifetime
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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
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
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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
- 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 various use circuits.
- the invention relates more particularly to an electro-hydraulic group intended to supply hydraulic receivers of the kind used in the automotive industry and in particular for the assistance of the management of these vehicles.
- the realization of the invention relates more particularly still so-called compact groups which are sealed groups in which the assembly, hydraulic pump and motor, is contained in a waterproof envelope also serving as fluid reservoir.
- the invention aims to reduce, even annihilate, the noises resulting from the operation of an electro-hydraulic group and provides that in the event of an electrical circuit failure of the vehicle the presence of the electro-hydraulic control group does not prevent free circuit maneuvering servo-controlled, in particular of the vehicle's steering circuit.
- this comprises the electro-hydraulic group compact in which an electric motor drives a pump hydraulics with pump housings damping sound waves partially surrounding the minus the cavity containing the pump pinions, at least some of the communicating damping cavities, by a side face of the pump body, with a chamber a cover leading to a connection of the operating circuit.
- Fig. 1 is a partially schematic partial elevation section 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 next view 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 feature of the invention.
- Fig. 7 is a partial sectional elevation similar to the fig. 3 of the electro-hydraulic group pump illustrating a development of the invention.
- the motor-pump unit includes an electric motor 1 of which only the envelope is silhouetted and a hydraulic pump 2 whose input shaft 3 is driven by the motor 1 by means 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 trees 3 and 5 above by a so-called compensation device hydrostatic of which only fittings 8 are shown.
- Shafts 3 and 5 are fitted with pinions 9, 10 housed in a cavity 11 of the pump body 12.
- the pump body 12 is made in one piece, for example aluminum alloy, and present on both sides of the cavity 11, two through holes 13, 14 for placing in place of tightening bolts 15 holding 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 engine.
- the side cheeks are made of high modulus material of elasticity, for example steel, to present a thickness as low as possible given the efforts that they have to endure.
- 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 delimiting cover 18, opposite the cheek 17, a chamber 19 in which the fluid under high pressure, driven by the pinions 9, 10, is brought through a lumen 20 of the cheek 17.
- the cheek 16 held by the clamping bolts 15 is, by elsewhere, centered on the pump body 12 by pins 21 and the free face of the cheek 16 has a crown 22 making projection, 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 fig. 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 through it right through in which the cartridge 26 is placed a pressure relief valve 27 (fig. 1) including the piston 28 pushed by a calibration spring 29 is in communication by a bore 30 with the chamber 19 in which the fluid under high pressure.
- a pressure relief valve 27 (fig. 1) including the piston 28 pushed by a calibration spring 29 is in communication by a bore 30 with the chamber 19 in which the fluid under high pressure.
- Fig. 1 shows that the pressure relief valve crosses the plays 17.
- the piston 28 of the pressure relief valve 27 controls the opening discharge channels 31 leading inside 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 damping sound waves generated by the operation of the pump.
- At least some of the cavities 34, 35, 36 can be linked together to cause circulation of the high pressure fluid they contain.
- the pump body 12 includes an intake duct 37 which leads to the cavity 11 containing the pinions (fig. 5) and which opens inside the envelope 32 filled with fluid under low pressure.
- the pump body 12 delimits a channel 38 opening into one of the so-called Helmholtz cavities, in this case the cavity 34, and leading through a conduit 39 to inside the envelope 32.
- a non-return valve 40 consisting of a ball, a spring and a retaining member is disposed in channel 38 and is held against his 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 path bypass for the fluid between the low pressure circuits and high pressure, which allows, if necessary, use a fluid receiving mechanism in the event of a breakdown power supply to the pump drive electric motor. Indeed, the circulation between the low pressure circuits and high pressure which can be established by the valve non-return 40 prevents a blockage as it could happen with respect to the receptor mechanism which does could not be operated manually if the high circuit pressure fails to be supplied by the low circuit pressure.
- a flexible conduit for example a corrugated duct 41 surrounding the pump body and connecting the intake duct 37 inside the casing 32.
- conduit 41 has the effect of improving still the damping of the sound waves generated by the pump operation.
- the pump is very compact since it is the body pump which delimits all the cavities necessary for the installation of both pinions and damping chambers the pressure relief valve and the intake ducts and discharge, this pump body being closed by cheeks thin, 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 bolts 23 which contribute to ensuring the sealing functions of the pump as illustrated in fig. 2.
- the whole, hydraulic unit - hydraulic motor is then engaged to inside the envelope 32.
- the cover 18 forms a connector 42 on which the casing 32 is engaged, sealing being ensured by an O-ring 43.
- the connector 42 is preferably provided so as to allow quick connection with a mounting bracket. Bore threaded 44 allows the fixing of a supply pipe of a 44 'receiver
- cheek 17 delimits two chambers 19 and 34.
- the pump delivers in chambers 19 and 34 by 20, 45 and 46 calibrated channels that designated by 20 corresponding to the actual discharge of the pump.
Description
L'invention concerne les groupes électro-hydrauliques dans lesquels un moteur électrique entraíne 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 various use circuits.
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 kind used in the automotive industry and in particular for the assistance of 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 realization of the invention relates more particularly still so-called compact groups which are sealed groups in which the assembly, hydraulic pump and motor, is contained in a waterproof envelope also serving as 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 system had to be made as narrow as possible so that it can be accommodated in a small volume enclosure that can be easily mounted in cramped spaces left free under a vehicle engine hood.
En outre, l'invention vise a réduire, voir a 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 annihilate, the noises resulting from the operation of an electro-hydraulic group and provides that in the event of an electrical circuit failure of the vehicle the presence of the electro-hydraulic control group does not prevent free circuit maneuvering servo-controlled, in particular of the vehicle's steering circuit.
Conformément à l'invention, celle-ci comporte le groupe électro-hydraulique compact dans lequel un moteur électrique entraíne 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, certaines au moins des cavités d'amortissement communiquant, par une face latérale du corps de pompe, avec une chambre d'un couvercle menant à un raccord du circuit d'utilisation.In accordance with the invention, this comprises the electro-hydraulic group compact in which an electric motor drives a pump hydraulics with pump housings damping sound waves partially surrounding the minus the cavity containing the pump pinions, at least some of the communicating damping cavities, by a side face of the pump body, with a chamber a cover leading to a connection of the operating circuit.
Diverses autres caractéristiques de l'invention ressortent d'ailleurs de la description détaillée qui suit.Various other features of the invention emerge moreover 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 annexés.Embodiments of the object of the invention are shown, by way of nonlimiting examples, in the drawing attached.
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 elevation section 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 next view 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 feature 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 the fig. 3 of the electro-hydraulic group pump 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 entraíné par le moteur 1 au moyen
d'un accouplement 4.The motor-pump unit includes an electric motor 1 of which
only the envelope is silhouetted and a
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
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.The hydrostatic compensation devices being good 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.
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
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 high modulus material of elasticity, for example steel, to present a thickness as low as possible given the efforts that they have to endure.
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 pignons 9, 10, est
amené à travers une lumière 20 de la joue 17.Fig. 3 shows that the
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
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
La fig. 1 montre que le clapet de surpression traverse la
joue 17.Fig. 1 shows that the pressure relief valve crosses the
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
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
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
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
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
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
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'entraínement 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
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.Alternatively, it was found to be advantageous, as
illustrated in fig. 6, to provide a flexible conduit for example
a
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
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 is apparent from the above description, the pump is very compact since it is the body pump which delimits all the cavities necessary for the installation of both pinions and damping chambers the pressure relief valve and the intake ducts and discharge, this pump body being closed by cheeks thin, 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 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.Indeed, after setting up the
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
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 44'It is advantageous, as illustrated in FIGS. 1 to 3, that the
La réalisation selon la fig. 7 montre que la joue 17 délimite
deux chambres 19 et 34. La pompe débite 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
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
La répartition du volume en ceux 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
cavités d'amortissement et entre les parties de refoulement
des pignons et les cavités d'amortissement.The distribution of volume in those
L'invention n'est pas limitée aux exemples de réalisation, représentés et décrits en détail, car diverses modifications peuvent y être apportées sans sortir du cadre des revendications annexées.The invention is not limited to the exemplary embodiments, shown and described in detail, because various modifications can be made without departing from the appended claims.
Claims (13)
- Compact electrohydraulic apparatus in which an electric motor (1) drives a hydraulic pump (2), the pump body (2) of which comprises a plurality of sound waves absorption cavities (34-36) surrounding at least partially the cavity (11) that contains the pinions of the pump, some at least of said absorption cavities communicating, by means of a side face of the pump body (12), with a chamber (19) of a cover (18) leading to a connector (42) of the utilization circuit (44).
- Electrohydraulic apparatus according to claim 1, characterized in that one at least of the absorption cavities is formed by two chambers (19, 34) provided in the high pressure circuit and which are separated by a cheek (17), channels being provided in said cheek.
- Electrohydraulic apparatus according to claim 1, characterized by calibrated apertures (20, 45, 46, 47) that are part of the high pressure back drive circuit and make the absorption chambers and the high pressure outlet to communicate for reducing the pressure pulses that are generated by the pump.
- Electrohydraulic apparatus according to claim 1, characterized in that a housing (25) is provided in the pump body between the cavity (11) that contains the pinions (9, 10) and the periphery of this body for containing an over pressure cartridge (26).
- Electrohydraulic apparatus according to one of claims 1 to 4, characterized in that one of the sound waves absorption cavities (34) communicates, on the one hand, with the high pressure chamber (19) in the cover (18) and, on the other hand, with a duct (39) leading to the low pressure circuit by means of a back flow preventing flap valve (40) arranged in a channel (38) that forms a derivating circuit.
- Electrohydraulic apparatus according to one of claims 1 to 5, characterized in that the pump body (12) is maintained on each of its lateral sides by means of side cheeks (16, 17) that form retaining members for bearings (6, 7) that support the shafts (3, 5), pinions (9, 10) and sealing members (8) of hydrostatic compensation devices.
- Electrohydraulic apparatus according to one of claims 1 to 6, characterized in that the assembly, pump body (12), side cheeks (16, 17) and cover (18), is maintained by means of bolts (15) and centring studs (21) for constituting a unitary structure.
- Electrohydraulic apparatus according to claim 7, characterized in that the assembly, pump body (12), side cheeks (16, 17) and cover (18), is formed, on one of the side cheek (16), with a centring ring (22) for the electric motor (1) that is secured to said assembly by means of bolts (23) passing through the cover, side cheeks (16, 17) and pump body (12), which bolts are fixed in said motor (1).
- Electrohydraulic apparatus according to claims 1 to 8, characterized in that an inlet duct (37), that is pierced in the pump body (12) for bringing the fluid to the cavity (11) that contains the pinions (9, 10), opens in a casing (32) that forms a tank containing the pump and electric motor.
- Electrohydraulic apparatus according to one of claims 1 to 9, characterized in that the inlet duct (37) of the pump body is connected to a duct (41) surrounding the pump body and opening to the inside of the casing (32) that contains the low pressure fluid.
- Electrohydraulic apparatus according to one of claims 1 to 10, characterized in that the side cheeks (16, 17), that maintain the pump body, are made of a material having a high resiliency modulus, more particularly steel.
- Electrohydraulic apparatus according to one of claims 1 to 11, characterized in that the cover (18) is provided with a connector (42) engaged in one end of the casing (32) to which this connector is connected by a O-ring seal-tightness gasket (43).
- Electrohydraulic apparatus according to one of claims 1 to 12, characterized in that the connector (42) is provided for receiving a feeding pipe (44).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9510219A FR2738302B1 (en) | 1995-08-30 | 1995-08-30 | COMPACT ELECTRO-HYDRAULIC GROUP |
| FR9510219 | 1995-08-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0761970A1 EP0761970A1 (en) | 1997-03-12 |
| EP0761970B1 true EP0761970B1 (en) | 1999-01-07 |
Family
ID=9482168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96401657A Expired - Lifetime EP0761970B1 (en) | 1995-08-30 | 1996-07-25 | Compact electrohydraulic apparatus |
Country Status (9)
| Country | Link |
|---|---|
| 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) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3667034B2 (en) * | 1996-07-17 | 2005-07-06 | 光洋精工株式会社 | Electric pump |
| US6158983A (en) * | 1997-04-24 | 2000-12-12 | Trw Inc. | Pump having muffler for attenuating noise |
| US5961309A (en) * | 1997-04-24 | 1999-10-05 | Trw Inc. | Gear pump with noise attenuation |
| 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 |
| DE69936232T2 (en) | 1998-09-18 | 2008-01-17 | Jtekt Corp. | Electrically driven pump |
| FR2789446B1 (en) † | 1999-02-04 | 2002-03-08 | Hydroperfect Internat Hpi | HYDRAULIC PUMP OF THE GEAR TYPE AND ELECTRIC PUMP GROUP EQUIPPED WITH SUCH A PUMP |
| US6305919B1 (en) * | 1999-08-24 | 2001-10-23 | Visteon Global Technologies, Inc. | Hydraulic pump housing with an integral dampener chamber |
| 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 |
| DE102004021885B4 (en) * | 2004-05-04 | 2009-10-01 | Zf Lenksysteme Gmbh | Rotary hydraulic pump |
| DE202005006414U1 (en) * | 2005-04-21 | 2005-08-04 | Trw Automotive Gmbh | Motor pump unit for servo steering of vehicle has external tank, ECU fitted axially or radially to the unit housing and ECU plugs arranged radially or axially |
| US8122867B2 (en) * | 2008-11-17 | 2012-02-28 | GM Global Technology Operations LLC | Engine with oil pump muffler and noise damper |
| DE102014221378B3 (en) * | 2014-10-21 | 2015-09-24 | Magna Powertrain Bad Homburg GmbH | Device for pressure compensation |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3121529A (en) * | 1962-05-02 | 1964-02-18 | Polysius Gmbh | Blower |
| US4174196A (en) * | 1976-07-28 | 1979-11-13 | Hitachi, Ltd. | Screw fluid machine |
| GB2036873B (en) * | 1978-12-01 | 1983-02-09 | South Western Ind Res | Silencing fluid pumps and motors |
| DE2922731A1 (en) * | 1979-06-05 | 1980-12-18 | Bosch Gmbh Robert | Electric fuel pump unit - has pumped fuel serving as coolant for electric motor with pump and motor rigidly combined |
| GB2102074B (en) * | 1981-07-18 | 1985-01-30 | Dowty Group Services | Positive-displacement fluid-machines |
| FR2522734B1 (en) * | 1982-03-04 | 1986-11-21 | Hydroperfect Int | ELECTRO-HYDRAULIC UNIT AND ITS APPLICATION TO THE ASSISTANCE OF STEERING, BRAKING, SUSPENSION AND THE LIKE DEVICES, PARTICULARLY FOR VEHICLES |
| FR2522824A1 (en) * | 1982-03-05 | 1983-09-09 | Commissariat Energie Atomique | DEVICE FOR APPLYING TWO-STATE LOGIC LOGIC SIGNALS ON AN INPUT OF A LOGIC CIRCUIT AND APPLICATION TO AUTOMATIC TESTING OF A PLURALITY OF LOGIC CIRCUITS |
| JPS603293U (en) * | 1983-06-21 | 1985-01-11 | 三菱電機株式会社 | pump equipment |
| JPS6088886A (en) * | 1983-10-21 | 1985-05-18 | Hitachi Ltd | Fuel feed pump |
| JP2550042B2 (en) * | 1985-01-15 | 1996-10-30 | ツア−ンラ−トフアブリ−ク フリ−ドリツヒスハ−フエン アクチエンゲゼルシヤフト | Vane pump |
| US5320501A (en) * | 1991-04-18 | 1994-06-14 | Vickers, Incorporated | Electric motor driven hydraulic apparatus with an integrated pump |
| US5401150A (en) * | 1994-02-28 | 1995-03-28 | General Signal Corporation | Noise reduced liquid sealed compressor |
| US5507151A (en) * | 1995-02-16 | 1996-04-16 | American Standard Inc. | Noise reduction in screw compressor-based refrigeration systems |
-
1995
- 1995-08-30 FR FR9510219A patent/FR2738302B1/en not_active Expired - Lifetime
-
1996
- 1996-07-25 ES ES96401657T patent/ES2127609T3/en not_active Expired - Lifetime
- 1996-07-25 DE DE69601290T patent/DE69601290C5/en not_active Expired - Lifetime
- 1996-07-25 EP EP96401657A patent/EP0761970B1/en not_active Expired - Lifetime
- 1996-07-25 DE DE0761970T patent/DE761970T1/en active Pending
- 1996-08-08 US US08/693,982 patent/US5692883A/en not_active Expired - Lifetime
- 1996-08-23 BR BR9603535A patent/BR9603535A/en active Search and Examination
- 1996-08-28 JP JP22717996A patent/JP4115548B2/en not_active Expired - Lifetime
- 1996-08-28 CN CN96111166A patent/CN1146963A/en active Pending
- 1996-08-29 AR ARP960104151A patent/AR003377A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR9603535A (en) | 1998-05-12 |
| FR2738302A1 (en) | 1997-03-07 |
| JP4115548B2 (en) | 2008-07-09 |
| FR2738302B1 (en) | 1997-10-10 |
| ES2127609T3 (en) | 1999-04-16 |
| EP0761970A1 (en) | 1997-03-12 |
| DE69601290D1 (en) | 1999-02-18 |
| DE761970T1 (en) | 1997-09-11 |
| DE69601290T2 (en) | 1999-06-02 |
| AR003377A1 (en) | 1998-07-08 |
| DE69601290C5 (en) | 2010-10-28 |
| JPH09105385A (en) | 1997-04-22 |
| US5692883A (en) | 1997-12-02 |
| CN1146963A (en) | 1997-04-09 |
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