EP0088674A1 - Electrohydraulic apparatus for steering systems, in particular for vehicles - Google Patents

Electrohydraulic apparatus for steering systems, in particular for vehicles Download PDF

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Publication number
EP0088674A1
EP0088674A1 EP83400405A EP83400405A EP0088674A1 EP 0088674 A1 EP0088674 A1 EP 0088674A1 EP 83400405 A EP83400405 A EP 83400405A EP 83400405 A EP83400405 A EP 83400405A EP 0088674 A1 EP0088674 A1 EP 0088674A1
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EP
European Patent Office
Prior art keywords
pump
group according
electric motor
hydraulic
hydraulic pump
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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.)
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EP83400405A
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German (de)
French (fr)
Inventor
R. Laumont
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Hydroperfect International Inc
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Hydroperfect International Inc
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Publication of EP0088674A1 publication Critical patent/EP0088674A1/en
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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
    • F04C11/008—Enclosed motor pump units

Definitions

  • the present invention relates to assistance devices for vehicles and in particular devices implementing a hydraulic circuit. It extends to similar applications.
  • hydraulic assistance devices for vehicle steering mechanisms include a hydraulic pump permanently driven by the main engine of the vehicle, most often by a belt, this pump delivering in a pressure accumulator by l 'through a hydraulic circuit breaker.
  • the pump constantly discharges pressurized liquid which always returns to the tank even when the circuit breaker is tripped, this arrangement consumes significant energy, most of which is dissipated as heat.
  • the main engine of the vehicle must be running.
  • the flow rate of the pump is all the more important as the main engine of the vehicle rotates quickly while the power to be developed to assist the steering is highest when the engine rotates slowly, that is to say when the driver performs maneuvers at low speed, in particular parking maneuvers.
  • the invention solves the problem set out above by providing an electro-hydraulic group for servo devices, in particular for steering, braking, suspension and the like, comprising an electric motor directly coupled to the shaft of a hydraulic pump with gears which is characterized in that the motor and the pump have a common interface constituting a lateral cheek for the electric motor, this common interface being formed in one piece with the body of the hydraulic pump.
  • US Pat. No. 3,515,167 describes an electric motor mounted on the side of a plate which forms a support for the body of a hydraulic pump and for an envelope surrounding the body of the hydraulic pump and containing hydraulic fluid.
  • patent GB-A-987,587 describes an electric motor fixed by bolts to an intermediate part carrying bearings and a coupling used for driving a pump, itself fixed to the intermediate part.
  • Patent FR-A-81 03209 describes a fuel pump, the pump of which consists of a stack of pieces in the form of plates which are fixed to one side of an electric motor.
  • Patent FR - A - 73 40853 also relates to a group comprising a hydraulic pump fixed to a plate itself supporting the support of a hydraulic motor.
  • patent FR-73 37058 describes an electric pump for liquids with high electrical resistance directly driven by an electric motor. This is also the case of the patent DE 1,200,136 of which an electric motor is associated with a centrifugal fan wheel, of the patent US - A - 2,634,904 of which a vane pump is attached to a drive motor and of the patent FR 70 10782 which relates to a rotary pump.
  • Fig. 1 is a diagram of a vehicle steering assistance device applying the electro-hydraulic group of the invention.
  • Fig. 2 is a longitudinal sectional elevation of an embodiment of the electro-hydraulic group of the invention.
  • Fig. 3 is a front elevation seen along line III-III of FIG. 2.
  • Fig. 4 is a section taken on the line IV-IV of FIG. 2.
  • Fig. 5 is a sectional elevation similar to FIG. 2 of a variant.
  • Fig. 1 schematically shows a hydraulic assistance device for steering a vehicle.
  • This device comprises a double-acting hydraulic cylinder 1, the piston rod 2 of which controls the steering rods 3, 4.
  • the chambers of the hydraulic cylinder 1 are supplied in a manner known per se by a drawer distributor 5 actuated by a pinion 6 of the steering column.
  • the body of the distributor 5 is connected by a pipe 7 to a tank 8 containing a control liquid maintained under low pres sion, for example at atmospheric pressure and by a pipe 9 at the outlet of a hydraulic pump 10 which is short-circuited by a pressure relief valve 11 whose outlet 12 leads to the tank 8.
  • the hydraulic pump 10 is directly coupled to an electric motor 13.
  • Fig. 2 illustrates an advantageous embodiment according to which one of the lateral cheeks 14 of the electric motor 13 is formed from the body 15 of the hydraulic pump 10, that is to say that the electric motor and the pump comprise at least a common wall.
  • the body 15 and the cheek 14 are produced, for example, by molding, or by stamping, from non-magnetic metal.
  • the pump internally delimits a bore 16 in which are arranged two bearings 17 for the support of the gears 18, 19 of the pump.
  • the gears are mounted on shafts 20 and 21 inserted in the bearings 17.
  • the body 15 of the pump advantageously forms at its free end crimping lugs 22 of a cover 23.
  • Manufacturing by molding or stamping also makes it possible to form, on the one hand, reinforcement gussets 24 and, on the other hand, fixing studs 25 having housings 26 for the installation of bolts or screws.
  • the cheek 14 also forms a bearing 27 used for the establishment of the casing 28 forming the cylinder head of the electric motor.
  • the casing 28 is closed by a second cheek 29 which supports the various accessories of the engine as well as a bearing 30 for the shaft 31 of its rotor 32.
  • the rotor 32 is, moreover, supported in a second bearing 33 disposed in a stepped bore 34 formed in the rear part of the pump body 15.
  • the bore 34 contains, in its part 34a, a seal 35 and, in its part 34b, a connecting nut 36 for compensate for any misalignment between the shaft 31 of the electric motor and the shaft 20 of the hydraulic pump.
  • the pump body 15 also delimits a second stepped bore 37 preferably with frustoconical segments which communicates by channels 38 and 39 respectively with conduits 40 and 41 which are formed in the bearings 17 and which are respectively in communication with the end piece inlet 42 and the discharge nozzle 43 of the pump.
  • the frustoconical part 37a of larger diameter of the bore 37 contains a cartridge 44 which is internally provided with a spring 45 exerting a thrust force on a ball valve 46 thus maintained on its seat 47.
  • the spring is maintained by a crimped cover 48 and the cartridge is itself crimped by a flange 49 formed for this purpose in the side wall of the body 15 of the pump.
  • the embodiment described above shows that by the arrangement according to the invention the pressure relief valve 11 described with reference to FIG. 1 is completely integrated into the pump body 15 which at the same time forms one of the engine cheeks and part of the fixing pads of the electro-hydraulic group, the other fixing pads 25a being formed by the second cheek 29.
  • Fig. 5 illustrates a variant according to which the pump body 15 forms, as before, the cheek 14 of the motor and, moreover, an envelope 50 which completely surrounds the pump body 15.
  • the envelope 50 delimits with the pump body 15 produced exactly as described in the above a tank forming a tank 8a for the liquid under low pressure to supply the pump and the cylinder 1 illustrated in FIG. 1.
  • the envelope 50 is, for example, closed by a cover 51 which is crimped as illustrated in 52.
  • a seal 53 is advantageously disposed between the envelope 50 and the cover 51 which both can be provided with fins. cooling 54.
  • the envelope 50 also supports a filling base 55, the closing plug 56 of which is provided with a level detector 57.
  • the above arrangement is advantageous because it keeps the whole body of the pump at a uniform temperature, which eliminates any risk of differential expansion and ensures particularly safe operation for the hydraulic pump.
  • the casing 28 of the electric motor can be made watertight, the motor being constituted somewhat in the manner of the motors used in the heat transfer liquid accelerators of a central heating installation.
  • the motor casing can also constitute a reservoir for the tank for the circulation fluid of the pump.
  • the invention is not limited to the exemplary embodiments, shown and described in detail, since various modifica tions can be made without departing from its scope.
  • the drawing shows an electric motor with a wound motor, which constitutes only an illustration, the electric motor possibly also being a motor with a flat rotor or with a bell.
  • the motor can have a two-way rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Steering Mechanism (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

Le groupe électro-hydraulique pour l'asservissement de mécanismes de direction, de freinage, de suspension et autres, comporte un moteur électrique 32 dont l'arbre 31 est directement accouplé à l'arbre 20 d'une pompe hydraulique 10, le corps 15 de la pompe formant une interface 14 constituant l'une des joues de support de la culasse 28 du moteur électrique.The electro-hydraulic group for the control of steering, braking, suspension and other mechanisms comprises an electric motor 32, the shaft 31 of which is directly coupled to the shaft 20 of a hydraulic pump 10, the body 15 of the pump forming an interface 14 constituting one of the support cheeks of the cylinder head 28 of the electric motor.

Description

La présente invention concerne les dispositifs d'assistance pour véhicules et notamment les dispositifs mettant en oeuvre un circuit hydraulique. Elle s'étend à des applications analogues.The present invention relates to assistance devices for vehicles and in particular devices implementing a hydraulic circuit. It extends to similar applications.

Dans l'industrie automobile, les dispositifs d'assistance hydraulique pour les mécanismes de direction des véhicules comportent une pompe hydraulique entraînée en permanence par le moteur principal du véhicule, le plus souvent par une courroie, cette pompe débitant dans un accumulateur de pression par l'intermédiaire d'un disjoncteur hydraulique.In the automotive industry, hydraulic assistance devices for vehicle steering mechanisms include a hydraulic pump permanently driven by the main engine of the vehicle, most often by a belt, this pump delivering in a pressure accumulator by l 'through a hydraulic circuit breaker.

Etant donné que la pompe refoule en permanence du liquide sous pression qui retourne toujours à la bâche même lorsque le disjoncteur est déclenché, cette disposition consomme une énergie non négligeable dont l'essentiel est dissipé en chaleur. Par ailleurs, pour qu'il existe une assistance à la direction, il est nécessaire que le moteur principal du véhicule tourne. En outre, le débit de la pompe est d'autant plus important que le moteur principal du véhicule tourne vite alors que la puissance à développer pour assister la direction est la plus élevée lorsque le moteur tourne lentement, c'est-à-dire lorsque le conducteur effectue des manoeuvres à faible vitesse, notamment des manoeuvres de stationnement.Since the pump constantly discharges pressurized liquid which always returns to the tank even when the circuit breaker is tripped, this arrangement consumes significant energy, most of which is dissipated as heat. Furthermore, for there to be steering assistance, the main engine of the vehicle must be running. In addition, the flow rate of the pump is all the more important as the main engine of the vehicle rotates quickly while the power to be developed to assist the steering is highest when the engine rotates slowly, that is to say when the driver performs maneuvers at low speed, in particular parking maneuvers.

L'invention résout le problème exposé ci-dessus en prévoyant un groupe électro-hydraulique pour dispositifs d'asservissement, notamment de direction, de freinage, de suspension et analogues comportant un moteur électrique directement accouplé à l'arbre d'une pompe hydraulique à engrenages qui est caractérisé en ce que le moteur et la pompe présentent une interface commune constituant une joue latérale pour le moteur électrique, cette interface commune étant formée d'une seule pièce avec le corps de la pompe hydraulique.The invention solves the problem set out above by providing an electro-hydraulic group for servo devices, in particular for steering, braking, suspension and the like, comprising an electric motor directly coupled to the shaft of a hydraulic pump with gears which is characterized in that the motor and the pump have a common interface constituting a lateral cheek for the electric motor, this common interface being formed in one piece with the body of the hydraulic pump.

La technique antérieure a déjà fait connaître l'accouplement direct d'un moteur électrique et d'une pompe, notamment une pompe hydraulique. C'est le cas du brevet US - A - 4 241 484 dans lequel un moteur électrique est relié à une pièce intermédiaire qui supporte une pompe hydraulique entraînée directement par l'arbre du moteur électrique. C'est le cas aussi du brevet US - A - 2 678 156 qui décrit un moteur électrique fixé par des boulons à des plots disposés dans le corps d'une pompe hydraulique du type à palettes.The prior art has already made known the direct coupling of an electric motor and a pump, in particular a hydraulic pump. This is the case of US Pat. No. 4,241,484 in which an electric motor is connected to an intermediate part which supports a hydraulic pump driven directly by the shaft of the electric motor. This is also the case of US Pat. No. 2,678,156 which describes an electric motor fixed by bolts to studs arranged in the body of a hydraulic pump of the vane type.

De manière analogue, le brevet US - A - 3 515 167 décrit un moteur électrique monté sur le côté d'une plaque qui forme support pour le corps d'une pompe hydraulique et pour une enveloppe entourant le corps de la pompe hydraulique et contenant du liquide hydraulique.Similarly, US Pat. No. 3,515,167 describes an electric motor mounted on the side of a plate which forms a support for the body of a hydraulic pump and for an envelope surrounding the body of the hydraulic pump and containing hydraulic fluid.

De même, le brevet GB - A - 987 587 décrit un moteur électrique fixé par des boulons à une pièce intermédiaire portant des paliers et un accouplement servant à l'entraînement d'une pompe, elle-même fixée à la pièce intermédiaire.Likewise, patent GB-A-987,587 describes an electric motor fixed by bolts to an intermediate part carrying bearings and a coupling used for driving a pump, itself fixed to the intermediate part.

Le brevet FR - A - 81 03209 décrit de son côté une pompe à carburant dont la pompe est constituée par un empilage de pièces en forme de plaques qui sont fixées sur un côté d'un moteur électrique.Patent FR-A-81 03209 describes a fuel pump, the pump of which consists of a stack of pieces in the form of plates which are fixed to one side of an electric motor.

Le brevet FR - A - 73 40853 a également pour objet un groupe comportant une pompe hydraulique fixée à une plaque servant elle-même au support d'un moteur hydraulique.Patent FR - A - 73 40853 also relates to a group comprising a hydraulic pump fixed to a plate itself supporting the support of a hydraulic motor.

De son côté, le brevet FR - 73 37058 décrit une pompe électrique pour des liquides à résistance électrique élevée directement entraînée par un moteur électrique. C'est encore le cas du brevet DE 1 200 136 dont un moteur électrique est associé à une roue centrifuge de ventilateur, du brevet US - A - 2 634 904 dont une pompe à palette est accolée à un moteur d'entraînement et du brevet FR 70 10782 qui concerne une pompe rotative.For its part, patent FR-73 37058 describes an electric pump for liquids with high electrical resistance directly driven by an electric motor. This is also the case of the patent DE 1,200,136 of which an electric motor is associated with a centrifugal fan wheel, of the patent US - A - 2,634,904 of which a vane pump is attached to a drive motor and of the patent FR 70 10782 which relates to a rotary pump.

L'invention a pour objet de créer :

  • - un nouvel ensemble pour l'assistance de la direction d'un véhicule qui ne consomme de l'énergie qu'au moment où il y a lieu d'agir sur la direction du véhicule;
  • - un ensemble qui soit de réalisation simple et bon marché;
  • - un ensemble qui soit compact pour pouvoir être monté même dans un emplacement exigu et qui puisse fonctionner dans n'importe quelle position;
  • - un ensemble qui permet d'assurer l'assistance de certains organes, par exemple la direction, même lorsque le moteur principal ne tourne pas. Cette caractéristique permet, en particulier, de faire braquer les roues d'un véhicule à l'arrêt pour les amener à un angle qui correspond à l'angle de verrouillage d'un mécanisme antivol et cela sans avoir à exercer un effort important sur le volant. De même, lors de l'application du groupe électro-hydraulique de l'invention par exemple à l'assistance de mécanisme de suspension, il devient possible de lever le véhicule et/ou les roues après la mise en place d'une chandelle pour permettre le démontage successif des roues sans qu'il y ait à faire tourner le moteur principal du véhicule;
  • - un ensemble qui ne comporte qu'un tout petit nombre de pièces, ce qui le rend tout particulièrement économique en fabrication.
The object of the invention is to create:
  • - a new set for assisting the steering of a vehicle which consumes energy only when there is reason to act on the steering of the vehicle;
  • - a set that is simple and inexpensive to make;
  • - an assembly which is compact so that it can be mounted even in a cramped location and which can operate in any position;
  • - an assembly which makes it possible to ensure the assistance of certain organs, for example the steering, even when the main engine is not running. This characteristic makes it possible, in particular, to turn the wheels of a stationary vehicle to bring them to an angle which corresponds to the locking angle of an anti-theft mechanism and this without having to exert a significant force on the steering wheel. Similarly, when applying the electro-hydraulic group of the invention for example to the assistance of a suspension mechanism, it becomes possible to lift the vehicle and / or the wheels after the installation of a jack for allow the successive disassembly of the wheels without having to run the main engine of the vehicle;
  • - a set which includes only a very small number of parts, which makes it particularly economical in manufacturing.

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 object of the invention are shown, by way of nonlimiting examples, in the accompanying drawing.

La fig. 1 est un schéma d'un dispositif d'assistance de direction de véhicule faisant application du groupe électro-hydraulique de l'invention.Fig. 1 is a diagram of a vehicle steering assistance device applying the electro-hydraulic group of the invention.

La fig. 2 est une coupe-élévation longitudinale d'un mode de réalisation du groupe électro-hydraulique de l'invention.Fig. 2 is a longitudinal sectional elevation of an embodiment of the electro-hydraulic group of the invention.

La fig. 3 est une élévation de face vue suivant la ligne III-III de la fig. 2.Fig. 3 is a front elevation seen along line III-III of FIG. 2.

La fig. 4 est une coupe prise suivant la ligne IV-IV de la fig. 2.Fig. 4 is a section taken on the line IV-IV of FIG. 2.

La fig. 5 est une coupe-élévation analogue à la fig. 2 d'une variante.Fig. 5 is a sectional elevation similar to FIG. 2 of a variant.

La fig. 1 montre de façon schématique un dispositif d'assistance hydraulique pour la direction d'un véhicule. Ce dispositif comporte un vérin hydraulique 1 à double effet dont la tige de piston 2 commande les biellettes de direction 3, 4. Les chambres du vérin hydraulique 1 sont alimentées de façon connue en soi par un distributeur à tiroirs 5 actionné par un pignon 6 de la colonne de direction. Le corps du distributeur 5 est relié par une canalisation 7 à une bâche 8 contenant un liquide de commande maintenu sous basse pression, par exemple à la pression atmosphérique et par une canalisation 9 à la sortie d'une pompe hydraulique 10 qui est court-circuitée par un clapet de surpression 11 dont la sortie 12 conduit à la bâche 8.Fig. 1 schematically shows a hydraulic assistance device for steering a vehicle. This device comprises a double-acting hydraulic cylinder 1, the piston rod 2 of which controls the steering rods 3, 4. The chambers of the hydraulic cylinder 1 are supplied in a manner known per se by a drawer distributor 5 actuated by a pinion 6 of the steering column. The body of the distributor 5 is connected by a pipe 7 to a tank 8 containing a control liquid maintained under low pres sion, for example at atmospheric pressure and by a pipe 9 at the outlet of a hydraulic pump 10 which is short-circuited by a pressure relief valve 11 whose outlet 12 leads to the tank 8.

Selon l'invention, la pompe hydraulique 10 est directement accouplée à un moteur électrique 13.According to the invention, the hydraulic pump 10 is directly coupled to an electric motor 13.

La fig. 2 illustre un mode de réalisation avantageux selon lequel l'une des joues latérales 14 du moteur électrique 13 est formée à partir du corps 15 de la pompe hydraulique 10, c'est-à-dire que le moteur électrique et la pompe comportent au moins une paroi commune.Fig. 2 illustrates an advantageous embodiment according to which one of the lateral cheeks 14 of the electric motor 13 is formed from the body 15 of the hydraulic pump 10, that is to say that the electric motor and the pump comprise at least a common wall.

Le corps 15 et la joue 14 sont fabriqués par exemple par moulage, ou par matriçage, en métal non magnétique. La pompe délimite intérieurement un alésage 16 dans lequel sont disposés deux coussinets 17 pour le support des engrenages 18, 19 de la pompe. Les engrenages sont montés sur des arbres 20 et 21 insérés dans les coussinets 17.The body 15 and the cheek 14 are produced, for example, by molding, or by stamping, from non-magnetic metal. The pump internally delimits a bore 16 in which are arranged two bearings 17 for the support of the gears 18, 19 of the pump. The gears are mounted on shafts 20 and 21 inserted in the bearings 17.

Le corps 15 de la pompe forme avantageusement à son extrémité libre des pattes de sertissage 22 d'un couvercle 23.The body 15 of the pump advantageously forms at its free end crimping lugs 22 of a cover 23.

La fabrication par moulage ou matriçage permet aussi de former, d'une part, des goussets de renforcement 24 et, d'autre part, des plots de fixation 25 présentant des logements 26 pour la mise en place de boulons ou vis.Manufacturing by molding or stamping also makes it possible to form, on the one hand, reinforcement gussets 24 and, on the other hand, fixing studs 25 having housings 26 for the installation of bolts or screws.

La joue 14 forme aussi une portée 27 servant à la mise en place de l'enveloppe 28 formant culasse du moteur électrique. A son autre extrémité, l'enveloppe 28 est fermée par une seconde joue 29 qui supporte les différents accessoires du moteur ainsi qu'un palier 30 pour l'arbre 31 de son rotor 32. Le rotor 32 est, par ailleurs, supporté dans un second palier 33 disposé dans un alésage étagé 34 pratiqué dans la partie arrière du corps de pompe 15. L'alésage 34 contient, dans sa partie 34a, un joint d'étanchéité 35 et, dans sa partie 34b, une noix de liaison 36 pour compenser les défauts éventuels d'alignement entre l'arbre 31 du moteur électrique et l'arbre 20 de la pompe hydraulique.The cheek 14 also forms a bearing 27 used for the establishment of the casing 28 forming the cylinder head of the electric motor. At its other end, the casing 28 is closed by a second cheek 29 which supports the various accessories of the engine as well as a bearing 30 for the shaft 31 of its rotor 32. The rotor 32 is, moreover, supported in a second bearing 33 disposed in a stepped bore 34 formed in the rear part of the pump body 15. The bore 34 contains, in its part 34a, a seal 35 and, in its part 34b, a connecting nut 36 for compensate for any misalignment between the shaft 31 of the electric motor and the shaft 20 of the hydraulic pump.

Le corps de pompe 15 délimite aussi un second alésage étagé 37 de préférence à segments tronconiques qui communique par des canaux 38 et 39 respectivement avec des conduits 40 et 41 qui sont pratiqués dans les coussinets 17 et qui sont respectivement en communication avec l'embout d'admission 42 et l'embout de refoulement 43 de la pompe.The pump body 15 also delimits a second stepped bore 37 preferably with frustoconical segments which communicates by channels 38 and 39 respectively with conduits 40 and 41 which are formed in the bearings 17 and which are respectively in communication with the end piece inlet 42 and the discharge nozzle 43 of the pump.

La partie tronconique 37a de plus grand diamètre de l'alésage 37 contient une cartouche 44 qui est munie intérieurement d'un ressort 45 exerçant un effort de poussée sur un clapet à billes 46 maintenu ainsi sur son siège 47. Le ressort est maintenu par un couvercle serti 48 et la cartouche est elle-même sertie par une collerette 49 formée à cet effet dans la paroi latérale du corps 15 de la pompe.The frustoconical part 37a of larger diameter of the bore 37 contains a cartridge 44 which is internally provided with a spring 45 exerting a thrust force on a ball valve 46 thus maintained on its seat 47. The spring is maintained by a crimped cover 48 and the cartridge is itself crimped by a flange 49 formed for this purpose in the side wall of the body 15 of the pump.

Comme cela ressort de ce qui précède, en cas de surpression au niveau du refoulement de la pompe, le fluide passe par le conduit 40, le canal 38, -l'alésage 37 et il soulève le clapet 46 contre l'action du ressort 45 pour être ramené par le canal 39 et le conduit 41 à l'admission de la pompe.As is apparent from the above, in the event of an overpressure at the level of the pump discharge, the fluid passes through the conduit 40, the channel 38, the bore 37 and it raises the valve 46 against the action of the spring 45 to be brought back through the channel 39 and the conduit 41 to the intake of the pump.

La réalisation décrite ci-dessus montre que par la disposition selon l'invention le clapet de surpression 11 décrit en référence à la fig. 1 est complètement intégré au corps de pompe 15 qui forme en même temps l'une des joues du moteur et une partie des plots de fixation du groupe électro-hydraulique, les autres plots de fixation 25a étant formés par la seconde joue 29.The embodiment described above shows that by the arrangement according to the invention the pressure relief valve 11 described with reference to FIG. 1 is completely integrated into the pump body 15 which at the same time forms one of the engine cheeks and part of the fixing pads of the electro-hydraulic group, the other fixing pads 25a being formed by the second cheek 29.

La fig. 5 illustre une variante selon laquelle le corps de pompe 15 forme comme précédemment la joue 14 du moteur et, en outre, une enveloppe 50 qui entoure complètement le corps de pompe 15. L'enveloppe 50 délimite avec le corps de pompe 15 réalisé exactement comme décrit dans ce qui précède un réservoir formant une bâche 8a pour le liquide sous basse pression devant alimenter la pompe et le vérin 1 illustré à la fig. 1.Fig. 5 illustrates a variant according to which the pump body 15 forms, as before, the cheek 14 of the motor and, moreover, an envelope 50 which completely surrounds the pump body 15. The envelope 50 delimits with the pump body 15 produced exactly as described in the above a tank forming a tank 8a for the liquid under low pressure to supply the pump and the cylinder 1 illustrated in FIG. 1.

L'enveloppe 50 est, par exemple, fermée par un couvercle 51 qui est serti comme illustré en 52. Un joint d'étanchéité 53 est avantageusement disposé entre l'enveloppe 50 et le couvercle 51 qui tous deux peuvent être munis d'ailettes de refroidissement 54.The envelope 50 is, for example, closed by a cover 51 which is crimped as illustrated in 52. A seal 53 is advantageously disposed between the envelope 50 and the cover 51 which both can be provided with fins. cooling 54.

L'enveloppe 50 supporte aussi une embase de remplissage 55 dont le bouchon de fermeture 56 est muni d'un détecteur de niveau 57.The envelope 50 also supports a filling base 55, the closing plug 56 of which is provided with a level detector 57.

La disposition ci-dessus est avantageuse car elle permet de maintenir tout le corps de la pompe à une température uniforme, ce qui élimine tout risque de dilatations différentielles et assure un fonctionnement particulièrement sûr pour la pompe hydraulique.The above arrangement is advantageous because it keeps the whole body of the pump at a uniform temperature, which eliminates any risk of differential expansion and ensures particularly safe operation for the hydraulic pump.

Bien que cela ne soit pas représenté, dans une autre variante, l'enveloppe 28 du moteur électrique peut être rendue étanche, le moteur étant constitué un peu à la manière des moteurs utilisés dans les accélérateurs de liquide caloporteur d'installation de chauffage central. Dans ce cas, l'enveloppe du moteur peut aussi constituer un réservoir pour la bâche du liquide de circulation de la pompe.Although this is not shown, in another variant, the casing 28 of the electric motor can be made watertight, the motor being constituted somewhat in the manner of the motors used in the heat transfer liquid accelerators of a central heating installation. In this case, the motor casing can also constitute a reservoir for the tank for the circulation fluid of the pump.

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. En particulier, le dessin montre un moteur électrique à moteur bobiné, ce qui constitue seulement une illustration, le moteur électrique pouvant être également un moteur à rotor plan ou en cloche. De même, le moteur peut être à double sens de rotation.The invention is not limited to the exemplary embodiments, shown and described in detail, since various modifica tions can be made without departing from its scope. In particular, the drawing shows an electric motor with a wound motor, which constitutes only an illustration, the electric motor possibly also being a motor with a flat rotor or with a bell. Likewise, the motor can have a two-way rotation.

Claims (12)

1 - Groupe électro-hydraulique pour dispositifs d'asservissement, notamment de direction, de freinage, de suspension et analogues comportant un moteur électrique directement accouplé à l'arbre d'une pompe hydraulique à engrenages, caractérisé en ce que le moteur (32) et la pompe (10) présentent une interface commune constituant une joue latérale (14) pour le moteur électrique, cette interface commune étant formée d'une seule pièce avec le corps (15) de la pompe hydraulique.1 - Electro-hydraulic unit for servo devices, in particular for steering, braking, suspension and the like comprising an electric motor directly coupled to the shaft of a hydraulic gear pump, characterized in that the motor (32) and the pump (10) have a common interface constituting a lateral cheek (14) for the electric motor, this common interface being formed in one piece with the body (15) of the hydraulic pump. 2 - Groupe suivant la revendication 1, caractérisé en ce que le corps (15) de la pompe hydraulique forme, en outre, support pour un palier de support (33) de l'arbre (31) du moteur électrique.2 - Group according to claim 1, characterized in that the body (15) of the hydraulic pump further forms a support for a support bearing (33) of the shaft (31) of the electric motor. 3 - Groupe suivant l'une des revendications 1 et 2, caractérisé en ce que le corps (15) de la pompe hydraulique (10) présente un alésage (37) communiquant par des canaux avec les conduits d'admission et de refoulement de la pompe, ledit alésage contenant une cartouche (44) munie d'un clapet de surpression (46).3 - Group according to one of claims 1 and 2, characterized in that the body (15) of the hydraulic pump (10) has a bore (37) communicating through channels with the inlet and outlet pipes of the pump, said bore containing a cartridge (44) provided with a pressure relief valve (46). 4 - Groupe suivant l'une des revendications 1 à 3, caractérisé en ce que le clapet de surpression (46) est formé par une cartouche directement maintenue à l'intérieur du corps de pompe (15).4 - Group according to one of claims 1 to 3, characterized in that the pressure relief valve (46) is formed by a cartridge directly held inside the pump body (15). 5 - Groupe suivant l'une des revendications 1 à 4, caractérisé en ce que le corps de pompe (15) est fermé par un couvercle serti (23, 51).5 - Group according to one of claims 1 to 4, characterized in that the pump body (15) is closed by a crimped cover (23, 51). 6 - Groupe suivant l'une des revendications 1 à 5, caractérisé en ce que la cartouche contenant le clapet de surpression (44) est maintenue en place par sertissage (49) du corps de pompe (15).6 - Group according to one of claims 1 to 5, characterized in that the cartridge containing the check valve pressure (44) is held in place by crimping (49) the pump body (15). 7 - Groupe suivant l'une des revendications 1 à 6, caractérisé en ce que le corps de pompe (15) délimite un alésage étagé (34, 34a, 34b) pour contenir un palier (33) du moteur électrique (32), un joint d'étanchéité (55) isolant la pompe (10) du moteur électrique et une noix d'entraînement (36) compensant d'éventuels défauts d'alignement entre l'arbre du moteur (31) et l'arbre (20) de la pompe hydraulique.7 - Group according to one of claims 1 to 6, characterized in that the pump body (15) defines a stepped bore (34, 34a, 34b) to contain a bearing (33) of the electric motor (32), a seal (55) isolating the pump (10) from the electric motor and a drive nut (36) compensating for possible misalignments between the motor shaft (31) and the drive shaft (20) the hydraulic pump. 8 - Groupe suivant l'une des revendications 1 à 7, caractérisé en ce que la joue (14) formée par le corps (15) de la pompe hydraulique (10) délimite des plots de fixation (25, 26) de l'ensemble du groupe.8 - Group according to one of claims 1 to 7, characterized in that the cheek (14) formed by the body (15) of the hydraulic pump (10) delimits fixing pads (25, 26) of the assembly of the group. 9 - Groupe suivant l'une des revendications 1 à 8, caractérisé en ce qu'nne enveloppe (50) est formée à partir de la périphérie de la joue (14), cette enveloppe entourant complètement le corps de la pompe (15) et contenant du liquide pour l'alimentation de la pompe hydraulique (10) qui est ainsi baignée dans le liquide servant à son alimentation.9 - Group according to one of claims 1 to 8, characterized in that an envelope (50) is formed from the periphery of the cheek (14), this envelope completely surrounding the body of the pump (15) and containing liquid for the supply of the hydraulic pump (10) which is thus bathed in the liquid used for its supply. 10 - Groupe suivant l'une des revendications 1 à 9, caractérisé en ce qu'au moins l'enveloppe (50) forme des éléments d'échange de chaleur secondaire (52) du genre ailettes.10 - Group according to one of claims 1 to 9, characterized in that at least the casing (50) forms secondary heat exchange elements (52) of the fin type. 11 - Groupe suivant l'une des revendications 1 à 10, caractérisé en ce que l'enveloppe (54) est fermée par un couvercle (56) et comporte une embase de remplissage (55).11 - Group according to one of claims 1 to 10, characterized in that the envelope (54) is closed by a cover (56) and comprises a filling base (55). 12 - Groupe suivant l'une des revendications 1 à 11, caractérisé en ce que l'embase de remplissage (55) de l'enveloppe (54) est munie d'un bouchon détecteur de niveau (57).12 - Group according to one of claims 1 to 11, characterized in that the filling base (55) of the envelope (54) is provided with a level detector plug (57).
EP83400405A 1982-03-04 1983-02-28 Electrohydraulic apparatus for steering systems, in particular for vehicles Withdrawn EP0088674A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8203619A FR2522734B1 (en) 1982-03-04 1982-03-04 ELECTRO-HYDRAULIC UNIT AND ITS APPLICATION TO THE ASSISTANCE OF STEERING, BRAKING, SUSPENSION AND THE LIKE DEVICES, PARTICULARLY FOR VEHICLES
FR8203619 1982-03-04

Publications (1)

Publication Number Publication Date
EP0088674A1 true EP0088674A1 (en) 1983-09-14

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EP83400405A Withdrawn EP0088674A1 (en) 1982-03-04 1983-02-28 Electrohydraulic apparatus for steering systems, in particular for vehicles

Country Status (6)

Country Link
US (1) US4525126A (en)
EP (1) EP0088674A1 (en)
JP (1) JPS58164474A (en)
BR (1) BR8301046A (en)
ES (1) ES520204A0 (en)
FR (1) FR2522734B1 (en)

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Also Published As

Publication number Publication date
ES8401196A1 (en) 1983-12-01
FR2522734B1 (en) 1986-11-21
JPH0315592B2 (en) 1991-03-01
BR8301046A (en) 1983-11-22
US4525126A (en) 1985-06-25
FR2522734A1 (en) 1983-09-09
ES520204A0 (en) 1983-12-01
JPS58164474A (en) 1983-09-29

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