EP2288814A1 - Electro-hydraulic actuator with pump incorporated into the piston - Google Patents

Electro-hydraulic actuator with pump incorporated into the piston

Info

Publication number
EP2288814A1
EP2288814A1 EP09766006A EP09766006A EP2288814A1 EP 2288814 A1 EP2288814 A1 EP 2288814A1 EP 09766006 A EP09766006 A EP 09766006A EP 09766006 A EP09766006 A EP 09766006A EP 2288814 A1 EP2288814 A1 EP 2288814A1
Authority
EP
European Patent Office
Prior art keywords
piston
actuator
pump
chambers
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09766006A
Other languages
German (de)
French (fr)
Other versions
EP2288814B1 (en
Inventor
Robert Kyle Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Landing Systems SAS
Original Assignee
Messier Dowty SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messier Dowty SA filed Critical Messier Dowty SA
Publication of EP2288814A1 publication Critical patent/EP2288814A1/en
Application granted granted Critical
Publication of EP2288814B1 publication Critical patent/EP2288814B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18—Combined units comprising both motor and pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/785—Compensation of the difference in flow rate in closed fluid circuits using differential actuators

Definitions

  • the invention relates to an electrohydraulic actuator with pump integrated in the piston.
  • Electrohydraulic actuators having a body defining a cylindrical cavity in which a piston slides sealingly and divides the interior of the cavity into two chambers.
  • the piston is associated with at least one rod that passes through one of the fundus of the body.
  • the actuator also includes a bidirectional pump that is powered by an electric motor and has two ports each connected to one of the chambers of the cylinder. The pump makes it possible to transfer fluid from one chamber to another to move the piston and therefore the rod, the quantity of fluid corresponding to the volume differential between the chambers being supplied or absorbed by a compensating member, for example a accumulator.
  • These electrohydraulic actuators are generally relatively bulky since the electric motor and the pump are placed on the side of the cylinder.
  • Document FR 2 831 226 discloses elongated electrohydraulic actuators in which the motor, the pump and the accumulator are placed in the extension of the cylinder. Pipes pierced in the walls of the cylinder allow the ports of the pump to be connected to the two chambers.
  • This arrangement is very compact, but the engine is completely flooded, and a motor failure makes its replacement complex, because it is necessary to disassemble the actuator entirely.
  • the invention relates to a compact electrohydraulic actuator, while still being easy to maintain.
  • an electrohydraulic actuator comprising a body which defines a cylindrical cavity in which a piston slides sealingly and divides an internal volume of the chamber into two chambers of variable volume, the piston being associated at least one rod which passes through a bottom of the cavity, the actuator comprising a bidirectional pump having two ports each connected to one of the chambers, an electric motor for selectively driving the pump in one direction or in the the other, the pump being placed in the piston of the actuator to be movable with it, each of the ports opening directly into one of the chambers.
  • the electric motor is placed at the end of the actuator and drives in rotation a shaft of non-circular section which extends in the cylinder through the piston, the pump comprising a homologous drive member freely sliding on the along the shaft during movements of the rod but driven in rotation when the shaft rotates under the action of the electric motor.
  • the pump remains integrated inside the cylinder between the chambers, the engine remains at its end and can be easily dismantled in case of failure which, statistically, is more likely than a failure of the pump.
  • FIG. 1 is a sectional view of an actuator according to a particular embodiment of the invention
  • Figure 2 is a sectional view along the line II-II of Figure 1 of the piston of the actuator integrating the pump
  • Figure 3 is a sectional view similar to that of Figure 2 of an alternative embodiment of the invention.
  • the actuator comprises a body 1 which delimits a cylindrical cavity 2 extending along a longitudinal axis X.
  • a piston 3 is mounted with a leaktight sliding in the cylindrical cavity and defines therein two hydraulic chambers A, B.
  • the piston 3 is associated with a rod 4 which passes through a bottom of the body sealing 1. The various joints making the sealing mentioned are not shown here.
  • a bidirectional pump 5 is disposed directly in the piston 3.
  • the bidirectional pump 5 comprises carries two ports Pl, P2 which open respectively into one of the chambers A, B.
  • the bidirectional pump 5 comprises a rotary member (for example a barrel, a gear, a hub, etc.) that can be rotated to cause fluid transfer from a chamber to the chamber. other, and hence a displacement of the piston 3 in the cylindrical cavity 2.
  • a rotary member for example a barrel, a gear, a hub, etc.
  • the actuator comprises a splined shaft 6 which extends in the cylindrical cavity 2 parallel to the axis X is rotated by means of an electric motor 8 disposed here at the outside of the cavity 2.
  • the splined shaft 6 passes through the piston 3 which can slide freely along the splined shaft 6.
  • a rotation of the splined shaft 6 under the effect of a rotation of the electric motor 8 causes rotation of the rotary member of the bidirectional pump 5, which causes a transfer of fluid from one chamber to another, and hence the displacement of the piston 3 in the cylindrical cavity 2.
  • the actuator comprises compensating means for compensating a flow difference between the two chambers during a displacement of the piston 3 in the cavity
  • these compensating means comprise an accumulator 9 connected hydraulically connected to the chamber B.
  • the excess fluid which passes from the chamber A to the chamber B during a depression of the rod 4 is recovered in the 9.
  • the deficit of fluid passing from the chamber B to the chamber A during an output of the rod 4 is provided by the accumulator 9.
  • the bidirectional pump 5 is, in the example shown, the vane type.
  • the bidirectional pump 5 comprises a central hub 11 internally splined which is driven in rotation by the splined shaft 6 and which carries pallets 12 (only one of the pallets is referenced) which cooperate with an inner side wall 13 of the piston 3 and internal flanks thereof to define volumes for fluid transfer from one to the other of the ports.
  • the bidirectional pump 5 is of the gear type. It comprises an internally splined pinion gear 21 which is rotated by the splined shaft 6, which co-operates with a driven pinion 22.
  • the two pinions 21, 22 cooperate in sealing with an internal lateral wall 23 to define volumes allowing fluid transfer from one to the other of the ports.
  • any type of hydraulic pump can be used as long as it is integrated in the piston of the rod.
  • the shaft 6 is here fluted, it may more generally have a non-circular section adapted to cause a rotational drive of a homologous drive member of the pump with which it cooperates.

Abstract

The invention relates to an electrohydraulic actuator comprising a body (1) that defines a cylindrical cavity (2) in which a piston (3) slides in leaktight manner and divides an inside volume of the cavity into two chambers (A, B) of variable volume, the piston being associated with at least one rod (4) passing in leaktight manner through an end wall of the cavity, the actuator including a bidirectional pump (5) having two ports (P1, P2), each connected to one of the chambers, an electric motor (8) for selectively driving the pump in one direction or the other, the pump being placed inside the piston of the actuator so as to move together therewith. According to the invention, the motor is placed at the end of the actuator and drives a shaft of non-circular section (6) extending through the cavity parallel to a sliding direction of the piston (3) and of the rod (4), the shaft passing through the piston (3) to co-operate with a complementary drive member (11; 21) of the pump that slides freely along the shaft during movements of the rod but that is driven in rotation when the shaft turns under drive from the electric motor.

Description

Actionneur électrohydraulique à pompe intégrée dans le piston Electrohydraulic actuator with pump integrated in the piston
L'invention concerne un actionneur électrohydraulique à pompe intégrée dans le piston. ARRIERE-PLAN DE L'INVENTIONThe invention relates to an electrohydraulic actuator with pump integrated in the piston. BACKGROUND OF THE INVENTION
On connaît des actionneurs électrohydrauliques comportant un corps définissant une cavité cylindrique dans laquelle un piston coulisse à étanchéité et divise l'intérieur de la cavité en deux chambres. Le piston est associé à au moins une tige qui traverse l'un des fonds du corps. L' actionneur comporte également une pompe bidirectionnelle qui est actionnée par un moteur électrique et qui comporte deux ports qui sont reliés chacun à l'une des chambres du cylindre. La pompe permet de transférer du fluide d'une chambre à l'autre pour faire bouger le piston et donc la tige, la quantité de fluide correspondant au différentiel de volume entre les chambres étant fourni ou absorbé par un organe de compensation, par exemple un accumulateur. Ces actionneurs électrohydrauliques sont en général relativement encombrants puisque le moteur électrique et la pompe sont placés sur le côté du cylindre.Electrohydraulic actuators are known having a body defining a cylindrical cavity in which a piston slides sealingly and divides the interior of the cavity into two chambers. The piston is associated with at least one rod that passes through one of the fundus of the body. The actuator also includes a bidirectional pump that is powered by an electric motor and has two ports each connected to one of the chambers of the cylinder. The pump makes it possible to transfer fluid from one chamber to another to move the piston and therefore the rod, the quantity of fluid corresponding to the volume differential between the chambers being supplied or absorbed by a compensating member, for example a accumulator. These electrohydraulic actuators are generally relatively bulky since the electric motor and the pump are placed on the side of the cylinder.
On connaît, par exemple du document FR 2 831 226, des actionneurs électrohydrauliques longilignes dans les- quels le moteur la pompe et l'accumulateur sont placés dans le prolongement du cylindre. Des conduits percés dans les parois du cylindre permettent de connecter les ports de la pompe aux deux chambres .Document FR 2 831 226 discloses elongated electrohydraulic actuators in which the motor, the pump and the accumulator are placed in the extension of the cylinder. Pipes pierced in the walls of the cylinder allow the ports of the pump to be connected to the two chambers.
On connaît par ailleurs du document US 2 918 795 un actionneur électrohydraulique dans lesquels la pompe et le moteur sont embarqués dans le piston deUS Pat. No. 2,918,795 discloses an electrohydraulic actuator in which the pump and the motor are embedded in the piston of
1' actionneur, chacun des ports de la chambre débouchant directement dans l'une des chambres de l' actionneur . Cet agencement est très compact, mais le moteur est entièrement noyé, et une défaillance du moteur rend son remplacement complexe, car il faut désassembler entièrement l' actionneur .1 'actuator, each of the ports of the chamber opening directly in one of the actuator chambers. This arrangement is very compact, but the engine is completely flooded, and a motor failure makes its replacement complex, because it is necessary to disassemble the actuator entirely.
OBJET DE L'INVENTIONOBJECT OF THE INVENTION
L'invention a pour objet un actionneur électrohydraulique compact, tout en restant néanmoins facile d' entretien . BREVE DESCRIPTION DE L'INVENTIONThe invention relates to a compact electrohydraulic actuator, while still being easy to maintain. BRIEF DESCRIPTION OF THE INVENTION
En vue de la réalisation de ce but, on propose un actionneur électrohydraulique comportant un corps qui définit une cavité cylindrique dans laquelle un piston coulisse à étanchéité et divise un volume interne de la ca- vite en deux chambres à volume variable, le piston étant associé à au moins une tige qui traverse à étanchéité un fond de la cavité, l' actionneur comportant une pompe bidirectionnelle ayant deux ports connectés chacun à l'une des chambres, un moteur électrique pour entraîner sélec- tivement la pompe dans un sens ou dans l'autre, la pompe étant placée dans le piston de l' actionneur pour être mobile avec celui-ci, chacun des ports débouchant directement dans l'une des chambres.With a view to achieving this object, an electrohydraulic actuator is provided comprising a body which defines a cylindrical cavity in which a piston slides sealingly and divides an internal volume of the chamber into two chambers of variable volume, the piston being associated at least one rod which passes through a bottom of the cavity, the actuator comprising a bidirectional pump having two ports each connected to one of the chambers, an electric motor for selectively driving the pump in one direction or in the the other, the pump being placed in the piston of the actuator to be movable with it, each of the ports opening directly into one of the chambers.
Selon l'invention, le moteur électrique est placé en extrémité de l' actionneur et entraîne en rotation un arbre de section non circulaire qui s'étend dans le cylindre en traversant le piston, la pompe comportant un organe d'entraînement homologue glissant librement le long de l'arbre lors des déplacements de la tige mais en- traîné en rotation lorsque l'arbre tourne sous l'action du moteur électrique. Ainsi, bien que la pompe reste intégrée à l'intérieur même du cylindre entre les chambres, le moteur reste lui en extrémité et peut donc être facilement démonté en cas de défaillance qui, statistiquement, est plus probable qu'une défaillance de la pompe. BREVE DESCRIPTION DES FIGURESAccording to the invention, the electric motor is placed at the end of the actuator and drives in rotation a shaft of non-circular section which extends in the cylinder through the piston, the pump comprising a homologous drive member freely sliding on the along the shaft during movements of the rod but driven in rotation when the shaft rotates under the action of the electric motor. Thus, although the pump remains integrated inside the cylinder between the chambers, the engine remains at its end and can be easily dismantled in case of failure which, statistically, is more likely than a failure of the pump. BRIEF DESCRIPTION OF THE FIGURES
L'invention sera mieux comprise à la lumière de la description qui suit des figures des dessins annexés, parmi lesquelles : - la figure 1 est une vue en coupe d'un action- neur selon un mode particulier de réalisation de l'invention ; la figure 2 est une vue en coupe selon la ligne II-II de la figure 1 du piston de l'actionneur intégrant la pompe ; la figure 3 est une vue en coupe analogue à celle de la figure 2 d'une variante de réalisation de 1' invention .The invention will be better understood in the light of the following description of the figures of the accompanying drawings, in which: FIG. 1 is a sectional view of an actuator according to a particular embodiment of the invention; Figure 2 is a sectional view along the line II-II of Figure 1 of the piston of the actuator integrating the pump; Figure 3 is a sectional view similar to that of Figure 2 of an alternative embodiment of the invention.
DESCRIPTION DETAILLEE DE L'INVENTION En référence à la figure 1, et conformément à l'invention, l'actionneur comporte un corps 1 qui délimite une cavité cylindrique 2 s' étendant selon un axe longitudinal X. Un piston 3 est monté à coulissement étanche dans la cavité cylindrique et délimite dans celle-ci deux chambres hydrauliques A, B. Le piston 3 est associé à une tige 4 qui traverse à étanchéité un fond du corps 1. Les divers joints réalisant les étanchéités mentionnées ne sont pas représentés ici.DETAILED DESCRIPTION OF THE INVENTION With reference to FIG. 1, and in accordance with the invention, the actuator comprises a body 1 which delimits a cylindrical cavity 2 extending along a longitudinal axis X. A piston 3 is mounted with a leaktight sliding in the cylindrical cavity and defines therein two hydraulic chambers A, B. The piston 3 is associated with a rod 4 which passes through a bottom of the body sealing 1. The various joints making the sealing mentioned are not shown here.
Une pompe bidirectionnelle 5 est disposée direc- tement dans le piston 3. La pompe bidirectionnelle 5 corn- porte deux ports Pl, P2 qui débouchent respectivement dans l'une des chambres A, B.A bidirectional pump 5 is disposed directly in the piston 3. The bidirectional pump 5 comprises carries two ports Pl, P2 which open respectively into one of the chambers A, B.
De façon connue en soi, la pompe bidirectionnelle 5 comporte un organe rotatif (par exemple un barillet, un engrenage, un moyeu...) qu'il suffit d'entraîner en rotation pour provoquer un transfert de fluide d'une chambre à l'autre, et, partant, un déplacement du piston 3 dans la cavité cylindrique 2.In a manner known per se, the bidirectional pump 5 comprises a rotary member (for example a barrel, a gear, a hub, etc.) that can be rotated to cause fluid transfer from a chamber to the chamber. other, and hence a displacement of the piston 3 in the cylindrical cavity 2.
A cet effet, et selon l'invention, l'actionneur comporte un arbre cannelé 6 qui s'étend dans la cavité cylindrique 2 parallèlement à l'axe X est qui est entraîné en rotation au moyen d'un moteur électrique 8 disposé ici à l'extérieur de la cavité 2. L'arbre cannelé 6 traverse le piston 3 qui peut coulisser librement le long de l'arbre cannelé 6. Une rotation de l'arbre cannelé 6 sous l'effet d'une rotation du moteur électrique 8 provoque une rotation de l'organe rotatif de la pompe bidirectionnelle 5, qui provoque un transfert de fluide d'une chambre à l'autre, et, partant, le déplacement du piston 3 dans la cavité cylindrique 2.For this purpose, and according to the invention, the actuator comprises a splined shaft 6 which extends in the cylindrical cavity 2 parallel to the axis X is rotated by means of an electric motor 8 disposed here at the outside of the cavity 2. The splined shaft 6 passes through the piston 3 which can slide freely along the splined shaft 6. A rotation of the splined shaft 6 under the effect of a rotation of the electric motor 8 causes rotation of the rotary member of the bidirectional pump 5, which causes a transfer of fluid from one chamber to another, and hence the displacement of the piston 3 in the cylindrical cavity 2.
L'actionneur comporte des moyens de compensation pour compenser une différence de débit entre les deux chambres lors d'un déplacement du piston 3 dans la cavitéThe actuator comprises compensating means for compensating a flow difference between the two chambers during a displacement of the piston 3 in the cavity
2. Ici, ces moyens de compensation comportent un accumu- lateur 9 relié hydrauliquement relié à la chambre B. Le surplus de fluide qui transite de la chambre A vers la chambre B lors d' un enfoncement de la tige 4 est récupéré dans l'accumulateur 9. A l'inverse, le déficit de fluide transitant de la chambre B vers la chambre A lors d'une sortie de la tige 4 est fourni par l'accumulateur 9. Comme cela illustré à la figure 2, la pompe bidirectionnelle 5 est, dans l'exemple illustré, du type à palettes. La pompe bidirectionnelle 5 comporte un moyeu central 11 intérieurement cannelé qui est entraîné en ro- tation par l'arbre cannelé 6 et qui porté des palettes 12 (seule une seule des palettes est référencée) qui coopèrent avec une paroi latérale interne 13 du piston 3 et des flancs interne de celui-ci pour définir des volumes permettant le transfert de fluide de l'un à l'autre des ports.2. Here, these compensating means comprise an accumulator 9 connected hydraulically connected to the chamber B. The excess fluid which passes from the chamber A to the chamber B during a depression of the rod 4 is recovered in the 9. Conversely, the deficit of fluid passing from the chamber B to the chamber A during an output of the rod 4 is provided by the accumulator 9. As illustrated in Figure 2, the bidirectional pump 5 is, in the example shown, the vane type. The bidirectional pump 5 comprises a central hub 11 internally splined which is driven in rotation by the splined shaft 6 and which carries pallets 12 (only one of the pallets is referenced) which cooperate with an inner side wall 13 of the piston 3 and internal flanks thereof to define volumes for fluid transfer from one to the other of the ports.
Selon une variante illustrée à la figure 3, la pompe bidirectionnelle 5 est du type à engrenage. Elle comporte un pignon moteur 21 intérieurement cannelé qui est entraîné en rotation par l'arbre cannelé 6, qui coo- père avec un pignon mené 22. Les deux pignons 21,22 coopèrent à étanchéité avec une paroi latérale interne 23 pour définir des volumes permettant le transfert de fluide de l'un à l'autre des ports.According to a variant illustrated in Figure 3, the bidirectional pump 5 is of the gear type. It comprises an internally splined pinion gear 21 which is rotated by the splined shaft 6, which co-operates with a driven pinion 22. The two pinions 21, 22 cooperate in sealing with an internal lateral wall 23 to define volumes allowing fluid transfer from one to the other of the ports.
Sur les figures 2 et3, le port Pl, porté par la paroi du piston non visible sur cette coupe, a été indiqué en pointillés.In Figures 2 and 3, the port P1, carried by the piston wall not visible on this section, has been indicated in dashed lines.
L'invention n'est bien sûr pas limitée à ce qui vient d'être décrit mais englobe au contraire toute variante entrant dans le cadre défini par les revendica- tions.The invention is of course not limited to what has just been described, but on the contrary covers any variant within the scope defined by the claims.
En particulier, on pourra utiliser tout type de pompe hydraulique, du moment qu'elle soit intégrée dans le piston de la tige. En outre, bien que l'arbre 6 soit ici cannelé, il pourra plus généralement présenter une section non circulaire adaptée à provoquer un entraînement en rotation d'un organe d'entraînement homologue de la pompe avec lequel il coopère. En outre, il est possible d'ajouter une vanne électrique entre l'accumulateur et la chambre associée, pour éviter une mise en pression des chambres en l'absence de courant électrique. In particular, any type of hydraulic pump can be used as long as it is integrated in the piston of the rod. In addition, although the shaft 6 is here fluted, it may more generally have a non-circular section adapted to cause a rotational drive of a homologous drive member of the pump with which it cooperates. In addition, it is possible to add an electric valve between the accumulator and the associated chamber, to prevent pressurization of the chambers in the absence of electric current.

Claims

REVENDICATIONS
1. Actionneur électrohydraulique comportant un corps (1) qui définit une cavité cylindrique (2) dans laquelle un piston (3) coulisse à étanchéité et divise un volume interne de la cavité en deux chambres (A, B) à volume variable, le piston étant associé à au moins une tige (4) qui traverse à étanchéité un fond de la cavité, l' actionneur comportant une pompe bidirectionnelle (5) ayant deux ports (Pl, P2) connectés chacun à l'une des chambres, un moteur électrique (8) pour entraîner sélectivement la pompe dans un sens ou dans l'autre, la pompe étant placée dans le piston de l' actionneur pour être mo- bile avec celui-ci, chacun des ports débouchant directement dans l'une des chambres de l' actionneur, caractérisé en ce que le moteur est placé en extrémité d' actionneur et entraîne un arbre de section non circulaire (6) s' étendant dans la cavité parallèlement à une direction de coulissement du piston (3) et de la tige (4), l'arbre cannelé traversant le piston (3) pour coopérer avec un organe d'entraînement (11 ; 21) homologue de la pompe glissant librement le long de l'arbre lors des déplacements de la tige mais entraîné en rotation lorsque l'arbre tourne sous l'action du moteur électrique.An electrohydraulic actuator comprising a body (1) which defines a cylindrical cavity (2) in which a piston (3) slides sealingly and divides an internal volume of the cavity into two chambers (A, B) of variable volume, the piston being associated with at least one rod (4) which passes through a bottom of the cavity, the actuator comprising a bidirectional pump (5) having two ports (P1, P2) each connected to one of the chambers, an electric motor (8) for selectively driving the pump in one direction or the other, the pump being placed in the piston of the actuator to be movable with it, each of the ports opening directly into one of the chambers of the the actuator, characterized in that the motor is placed at the end of the actuator and drives a shaft of non - circular section (6) extending in the cavity parallel to a direction of sliding of the piston (3) and the rod ( 4), the splined shaft the piston (3) for cooperating with a driving member (11; 21) counterpart of the pump freely sliding along the shaft during movements of the rod but rotated when the shaft rotates under the action of the electric motor.
2. Actionneur selon la revendication 1, dans lequel l'organe d'entraînement est un moyeu (11) entraînant des palettes (12) .2. An actuator according to claim 1, wherein the drive member is a hub (11) driving pallets (12).
3. Actionneur selon la revendication 1, compor- tant un organe de compensation (9) d'une différence de débit entre les chambres (A, B) de l'actionneur lors d'un déplacement du piston. 3. An actuator according to claim 1, comprising a compensation member (9) for a difference of flow rate between the chambers (A, B) of the actuator as the piston moves.
EP09766006A 2008-06-17 2009-06-12 Electro-hydraulic actuator with pump incorporated into the piston Active EP2288814B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0803370A FR2932539B1 (en) 2008-06-17 2008-06-17 ELECTROHYDRAULIC ACTUATOR WITH INTEGRATED PUMP IN THE PISTON
PCT/FR2009/000701 WO2009153444A1 (en) 2008-06-17 2009-06-12 Electro-hydraulic actuator with pump incorporated into the piston

Publications (2)

Publication Number Publication Date
EP2288814A1 true EP2288814A1 (en) 2011-03-02
EP2288814B1 EP2288814B1 (en) 2012-02-15

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EP09766006A Active EP2288814B1 (en) 2008-06-17 2009-06-12 Electro-hydraulic actuator with pump incorporated into the piston

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US (1) US8863510B2 (en)
EP (1) EP2288814B1 (en)
JP (1) JP5421363B2 (en)
CN (1) CN102066773B (en)
AT (1) ATE545786T1 (en)
BR (1) BRPI0914832A2 (en)
CA (1) CA2728152C (en)
ES (1) ES2382269T3 (en)
FR (1) FR2932539B1 (en)
IL (1) IL210008A0 (en)
RU (1) RU2457369C1 (en)
WO (1) WO2009153444A1 (en)

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CN103527548B (en) * 2013-09-18 2016-08-31 三一汽车制造有限公司 Concrete pumping equipment and pumping oil cylinder
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EP3730806B1 (en) * 2019-04-24 2023-01-18 Piston Power s.r.o. Hydraulic actuator arrangement
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WO2009153444A1 (en) 2009-12-23
US8863510B2 (en) 2014-10-21
FR2932539A1 (en) 2009-12-18
EP2288814B1 (en) 2012-02-15
BRPI0914832A2 (en) 2015-10-27
CA2728152C (en) 2013-11-19
CN102066773A (en) 2011-05-18
ES2382269T3 (en) 2012-06-06
IL210008A0 (en) 2011-02-28
RU2457369C1 (en) 2012-07-27
FR2932539B1 (en) 2010-07-30
US20110146262A1 (en) 2011-06-23
JP5421363B2 (en) 2014-02-19
CA2728152A1 (en) 2009-12-23
JP2011524506A (en) 2011-09-01
CN102066773B (en) 2013-11-13
ATE545786T1 (en) 2012-03-15

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