EP0154854A1 - Vérin électro-hydraulique - Google Patents

Vérin électro-hydraulique Download PDF

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Publication number
EP0154854A1
EP0154854A1 EP85101892A EP85101892A EP0154854A1 EP 0154854 A1 EP0154854 A1 EP 0154854A1 EP 85101892 A EP85101892 A EP 85101892A EP 85101892 A EP85101892 A EP 85101892A EP 0154854 A1 EP0154854 A1 EP 0154854A1
Authority
EP
European Patent Office
Prior art keywords
housing
actuator according
piston
actuator
pressure
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.)
Withdrawn
Application number
EP85101892A
Other languages
German (de)
English (en)
Inventor
Walter Gresch
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.)
Bucher Guyer AG
Original Assignee
Bucher Guyer AG
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 Bucher Guyer AG filed Critical Bucher Guyer AG
Publication of EP0154854A1 publication Critical patent/EP0154854A1/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to an electrohydraulically actuated actuator comprising a thrust piston device which can be driven by means of a controllable liquid pump and a pushing piston device which counteracts the force of a return spring.
  • Such devices serve as actuators for fittings, braking devices, tensioning devices, etc.
  • This version is connected to an actuator acting as a valve.
  • a vibrating piston pump is provided, which has on its upper side a piston which is axially movably guided in the cylindrical upper part of the housing.
  • the free side of the piston facing away from the pump and the cylindrical upper housing part form a variable first pressure chamber.
  • the latter is connected to the lower housing part, which is designed as an oil collecting space.
  • the piston above the pump is provided with connecting channels that interact with check valves.
  • DOS 29 29 442 Another electro-hydraulic actuator has become known from DOS 29 29 442. It is a pump wheel of a centrifugal pump driven by an electric motor, through which a piston arranged in a vertical cylindrical guide bush is driven. In this construction, the actuator can only be loaded on one side.
  • Actuators are also known in which the actuator is driven by a motor via a threaded spindle.
  • the invention has for its object to provide an actuator of the type mentioned, with which the shortcomings described above are remedied.
  • this object is achieved in that the rest position of the piston is determined by the rear side, which is designed as a stop, of a housing base part which forms a liquid collecting space for the pressure medium with the upper housing part, which housing base part forms with the membrane an pressurizable pressure space adjacent to the liquid collecting space.
  • the liquid pump is arranged at least on the suction side in the liquid collection space and connects the pressure space to a line. As a result, a rational design can be achieved in a small space.
  • the pressure line can be arranged axially to the piston movement, whereby a short line routing is possible.
  • a branch line can be connected to the pressure line, which is provided with a check valve opening into the liquid collecting space.
  • the branch line can be provided with an adjustable pressure relief valve.
  • the housing base part is provided with a right-angled edge and is inserted in a cover-like manner laterally in the housing upper part, as a result of which a simplified partial assembly can be carried out.
  • the membrane can preferably be clamped between the annular surface of the housing base part, which runs transversely to the piston axis, and a housing shell inserted in the cover-like manner and welded to the latter.
  • a sealing element can be inserted in the annular space formed from the upper housing part, the housing base part and the housing shell to seal the liquid collecting space.
  • the housing shell at the opposite end of the diaphragm clamping point can have a radially inwardly directed annular surface which is provided as an end stop for the piston, with which greater strength can be achieved in this area.
  • the spring housing can be provided with a protective edge that merges with the housing.
  • the pump can be supported in the liquid collection space by means of damping elements.
  • Fig. 1 shows a longitudinal section through the actuator according to the invention.
  • An electrohydraulically actuatable actuator 1 shown in FIG. 1 consists of a liquid pump 2 and a thrust piston device 4 which can be driven by means of a return spring 3.
  • the liquid pump 2 is arranged in a closed housing 5.
  • the housing 5 formed from a pot-shaped housing upper part 7 and a housing base part 8 contains the hydraulic fluid 6, which is sucked in by the liquid pump 2 via a line 9 and via a pressure line 10 into the variable pressure space formed on the back of the housing base part 8 by a flexible membrane 11 12 is transported.
  • the pressure line 10 is made from a part connecting the housing base part 8 to the liquid pump 2 Sleeve 13 is formed and is provided with a branch line 14 to which a controllable check valve 15 is connected.
  • the valve outlet opening 16 opens into the hydraulic fluid 6.
  • the fastening of the membrane 11, which can be preformed or flat and elastic in the idle state, is clamped in by the outer flat annular surface on the back of the housing base part 8 and a housing shell 17 which is spot welded to the housing top part 7 and has an opening in the center.
  • the annular gap formed from the housing upper part 7, the housing base part 8 and the housing shell 17 is provided with a sealing element 37.
  • the spring housing 20 receiving the guide bearing 18 of the piston rod 19 and the return spring 3 is coupled to the housing shell 17 by means of a bayonet catch 2.
  • the insertion of a ring 39, which is secured against twisting, increases the stability of the bayonet catch on the housing shell 17.
  • the outer guide on the spring housing 20 is provided as a cylindrical attachment 22 and extends radially outwards and upwards against the circumference of the housing 5. This special shape largely prevents the entry of dust or foreign bodies into the interior of the spring housing 20.
  • the bottom of the spring housing 20 and the support legs 24 serve to fasten the actuator 1 to a carrier or the like.
  • the back of the membrane 11 lies on a plate-shaped piston 25 which is connected to a piston rod 26 passing through the return spring 3.
  • the flanks of the piston 25 sloping laterally outwards or inwards and the housing shell 17 connected to the housing 5 are designed as support surfaces 34, 35, on which the membrane 11 rolls when the piston moves.
  • the back of the housing base part 8 is equipped with an offset adapted to the plate shape of the piston 25.
  • the return spring 3 is supported on the rear of the piston 25.
  • a box 27 fastened to the upper housing part 7 is intended for receiving the electrical connection parts for the liquid pump 2 and shut-off valve 15. The latter are supported in the housing 5 via elastic damping elements 28.
  • the support element 28 provided between the liquid pump 2 and the housing base part 8 has a recess for the branch line 14.
  • the front suction end of the suction line 9 opens into a special suction device 29, which ensures that the actuator 1 is functional in five of six main axes.
  • the suction device 29 connected to the front end of the suction line 9 has at least two mutually opposite chambers 30, the common connecting line 36 of which is connected at right angles to the suction line 9.
  • Each chamber 30 has two openings which are arranged at 90 ° to one another and communicate with the liquid 6.
  • Each chamber 30 has a ball 32 which interrupts or establishes the connection of the chamber 30 with the suction line 9. In the position shown in FIG. 1, the chambers 30 lie one above the other and the connection of the upper chamber 30 to the suction line 9 is interrupted by the ball 32, while the ball 32 of the lower chamber 30 keeps the connection to the suction line 9 free.
  • the actuator is set in the horizontal position (rotated by 90 ° in FIG. 1), the balls 32 fall on both sides 30 to the openings 31, which are now located below, and thus allow the hydraulic fluid access to the suction line 9 through the adjacent openings 31.
  • the ball 32 of the upper chamber 30 blocks the connection path to the suction line 9, whereas the ball 32 of the lower chamber 30 releases this connection and thereby allows the liquid to be transported.
  • a hose can also be used which deviates from its position in the liquid collection space 33 with the change in position of the actuator due to a load at the suction end.
  • liquids which are difficult to evaporate e.g. Hydraulic oil, glycerin or the like can be used.
  • this controllable shut-off valve 15 is also equipped with a safety device (pressure relief valve 38) which reacts to excess pressure.
  • the suction line 9 is provided with a non-return valve - not shown in the figure - so that the pressure in the pressure chamber 11 continues even when the liquid pump 2 is exhausted.
  • the shut-off valve 15 By opening the shut-off valve 15, the liquid flows back into the liquid collecting space 33 via the branch line 14 (by-pass) and the piston 4 moves into its rest position on the housing base part 8.
  • both the piston rod and the connecting device can be used as an actuator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP85101892A 1984-03-15 1985-02-21 Vérin électro-hydraulique Withdrawn EP0154854A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1293/84 1984-03-15
CH129384 1984-03-15

Publications (1)

Publication Number Publication Date
EP0154854A1 true EP0154854A1 (fr) 1985-09-18

Family

ID=4207043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101892A Withdrawn EP0154854A1 (fr) 1984-03-15 1985-02-21 Vérin électro-hydraulique

Country Status (1)

Country Link
EP (1) EP0154854A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3510546A1 (de) * 1985-04-04 1986-10-02 Elektrowatt AG, Zürich Elektrohydraulischer stellantrieb fuer stetige regelung
DE3826359A1 (de) * 1987-08-11 1989-02-23 Volkswagen Ag Elektrisch angetriebener stellantrieb
EP0513915A1 (fr) * 1991-05-17 1992-11-19 Barber-Colman Company Vérin électro-hydraulique
EP0732512A2 (fr) * 1995-02-17 1996-09-18 MANNESMANN Aktiengesellschaft Unité piston-cylindre avec une soupape
DE10001665B4 (de) * 2000-01-17 2008-05-08 Linde Material Handling Gmbh Ventilanordnung zur Absicherung und leckölfreien Absperrung eines hydraulischen Verbrauchers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2669095A (en) * 1949-11-16 1954-02-16 Honeywell Regulator Co Pump and motor hydraulic actuator
US2885860A (en) * 1955-06-06 1959-05-12 Gen Controls Co Operator utilizing a hydraulic motor
US2929330A (en) * 1956-04-05 1960-03-22 Gen Controls Co Gear pump operated hydraulic motor
USRE25540E (en) * 1964-03-24 Means for operating a valve or the like in accordance
DE1425775B1 (de) * 1962-07-31 1971-01-21 Johnson Service Co Elektrohydraulische Stellvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE25540E (en) * 1964-03-24 Means for operating a valve or the like in accordance
US2669095A (en) * 1949-11-16 1954-02-16 Honeywell Regulator Co Pump and motor hydraulic actuator
US2885860A (en) * 1955-06-06 1959-05-12 Gen Controls Co Operator utilizing a hydraulic motor
US2929330A (en) * 1956-04-05 1960-03-22 Gen Controls Co Gear pump operated hydraulic motor
DE1425775B1 (de) * 1962-07-31 1971-01-21 Johnson Service Co Elektrohydraulische Stellvorrichtung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3510546A1 (de) * 1985-04-04 1986-10-02 Elektrowatt AG, Zürich Elektrohydraulischer stellantrieb fuer stetige regelung
FR2580040A1 (fr) * 1985-04-04 1986-10-10 Elektrowatt Ag
US4648245A (en) * 1985-04-04 1987-03-10 Elektrowatt Ag Electro-hydraulic actuator or positioning drive for continuous control or regulation operations
DE3826359A1 (de) * 1987-08-11 1989-02-23 Volkswagen Ag Elektrisch angetriebener stellantrieb
EP0513915A1 (fr) * 1991-05-17 1992-11-19 Barber-Colman Company Vérin électro-hydraulique
EP0732512A2 (fr) * 1995-02-17 1996-09-18 MANNESMANN Aktiengesellschaft Unité piston-cylindre avec une soupape
EP0732512A3 (fr) * 1995-02-17 1998-07-22 MANNESMANN Aktiengesellschaft Unité piston-cylindre avec une soupape
DE10001665B4 (de) * 2000-01-17 2008-05-08 Linde Material Handling Gmbh Ventilanordnung zur Absicherung und leckölfreien Absperrung eines hydraulischen Verbrauchers

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19850221

AK Designated contracting states

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19860704

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19861115

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GRESCH, WALTER