EP2288814A1 - Elektrohydraulischer aktuator mit in den kolben integrierter pumpe - Google Patents

Elektrohydraulischer aktuator mit in den kolben integrierter pumpe

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
English (en)
French (fr)
Other versions
EP2288814B1 (de
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/de
Application granted granted Critical
Publication of EP2288814B1 publication Critical patent/EP2288814B1/de
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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Reciprocating Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)
  • Hydraulic Motors (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
EP09766006A 2008-06-17 2009-06-12 Elektrohydraulischer aktuator mit in den kolben integrierter pumpe Active EP2288814B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0803370A FR2932539B1 (fr) 2008-06-17 2008-06-17 Actionneur electrohydraulique a pompe integree dans le piston
PCT/FR2009/000701 WO2009153444A1 (fr) 2008-06-17 2009-06-12 Actionneur electrohydraulique a pompe integree dans le piston.

Publications (2)

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

Family

ID=40225294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09766006A Active EP2288814B1 (de) 2008-06-17 2009-06-12 Elektrohydraulischer aktuator mit in den kolben integrierter pumpe

Country Status (12)

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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5458119B2 (ja) * 2012-01-24 2014-04-02 株式会社ロブテックス アクチュエータ
JP5458120B2 (ja) * 2012-01-26 2014-04-02 株式会社ロブテックス アクチュエータ
CN102913510A (zh) * 2012-11-06 2013-02-06 昆山北极光电子科技有限公司 一种连体式液压直线驱动装置
CN103527548B (zh) * 2013-09-18 2016-08-31 三一汽车制造有限公司 混凝土泵送设备及泵送油缸
US9868624B2 (en) * 2014-03-03 2018-01-16 Xtreme Manufacturing, Llc Method and system for a hydraulic cylinder
DE102015203387A1 (de) * 2015-02-25 2016-08-25 Fev Gmbh Doppelt wirkender Kolben eines VCR-Motors
US10787247B2 (en) * 2018-01-16 2020-09-29 Goodrich Corporation Hybrid actuator
EP3730806B1 (de) * 2019-04-24 2023-01-18 Piston Power s.r.o. Hydraulische aktuatoranordnung
CN113007172B (zh) * 2021-03-12 2022-04-12 燕山大学 一种集成柱塞马达式双动力液压缸

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631431A (en) * 1949-07-05 1953-03-17 Elmeg Electrohydraulic actuating device
US2918795A (en) * 1955-09-06 1959-12-29 Ramsey Corp Electro-hydraulic actuating cylinder
JPH0217204A (ja) * 1988-07-06 1990-01-22 Daiichi Denki Kk 駆動源一体型液圧シリンダ
FR2831226B1 (fr) 2001-10-24 2005-09-23 Snecma Moteurs Actionneur electrohydraulique autonome
CN1965169B (zh) * 2004-10-08 2012-02-08 施塔比鲁斯有限责任公司 流体线性驱动装置
RU2289735C1 (ru) * 2005-04-28 2006-12-20 Общество с ограниченной ответственностью Научно-производственное предприятие "Подъемтранссервис" Электрогидравлический толкатель
FR2895482B1 (fr) * 2005-12-23 2008-10-24 Messier Bugatti Sa Actionneur telescopique a tige principale et tige auxiliaire et procede faisant application
RU55055U1 (ru) * 2005-12-30 2006-07-27 Закрытое акционерное общество "МОСГИДРОМАШ" Электрогидравлический толкатель
CN201059299Y (zh) * 2007-03-28 2008-05-14 焦作市起重控制电器厂 双推杆电力液压推动器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009153444A1 *

Also Published As

Publication number Publication date
RU2457369C1 (ru) 2012-07-27
WO2009153444A1 (fr) 2009-12-23
ES2382269T3 (es) 2012-06-06
IL210008A0 (en) 2011-02-28
ATE545786T1 (de) 2012-03-15
US8863510B2 (en) 2014-10-21
BRPI0914832A2 (pt) 2015-10-27
CA2728152A1 (fr) 2009-12-23
JP2011524506A (ja) 2011-09-01
US20110146262A1 (en) 2011-06-23
JP5421363B2 (ja) 2014-02-19
FR2932539B1 (fr) 2010-07-30
CA2728152C (fr) 2013-11-19
CN102066773A (zh) 2011-05-18
CN102066773B (zh) 2013-11-13
EP2288814B1 (de) 2012-02-15
FR2932539A1 (fr) 2009-12-18

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