EP0612378B1 - Elektrohydraulisches gerät - Google Patents

Elektrohydraulisches gerät Download PDF

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Publication number
EP0612378B1
EP0612378B1 EP92922852A EP92922852A EP0612378B1 EP 0612378 B1 EP0612378 B1 EP 0612378B1 EP 92922852 A EP92922852 A EP 92922852A EP 92922852 A EP92922852 A EP 92922852A EP 0612378 B1 EP0612378 B1 EP 0612378B1
Authority
EP
European Patent Office
Prior art keywords
piston
centrifugal pump
cylinder
shaft
piston rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92922852A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0612378A1 (de
Inventor
Bernhard Sasse
Peter Zimmermann
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.)
ELMEG Elektro Mechanik GmbH
Original Assignee
ELMEG Elektro Mechanik GmbH
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 ELMEG Elektro Mechanik GmbH filed Critical ELMEG Elektro Mechanik GmbH
Publication of EP0612378A1 publication Critical patent/EP0612378A1/de
Application granted granted Critical
Publication of EP0612378B1 publication Critical patent/EP0612378B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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 electrohydraulic device for generating a force which is present on a movable piston rod connected to the piston of a cylinder, with a housing having a first centrifugal pump which is arranged on that part of the cylinder which is remote from the piston rod and which is connected to an electric motor via a shaft for the cylinder and the centrifugal pump, which delimits a storage space intended for operating fluid and has bushings for the shaft and the piston rod, the operating fluid being transferred from a cylinder space above the piston to a cylinder space below the piston or via a pressure line depending on the direction of rotation of the electric motor is pumped in the reverse direction, whereby the piston is moved as a result of the acting pressure and generates forces on the piston rod.
  • Such a hydraulic device is known from DE-GM 16 90 019.
  • This device has a horizontally arranged impeller driven by an electric motor with guide vanes.
  • a valve body is arranged above the impeller, which, depending on the direction of rotation of the electric motor, is pivoted into one of two fixed positions by the tangential forces of the operating fluid; this specifies flow directions for the operating fluid, namely that in one position the operating fluid is pumped from an area above the piston to an area below the piston, and in the other position, with the motor rotating in the opposite direction, the operating fluid flows in the opposite direction .
  • the piston is either moved up or down.
  • the disadvantage is that the manufacture of the valve body requires a very complex and precise work so that it reliably specifies the direction of flow.
  • an electro-hydraulic adjustment device with a motor and a pump is also known.
  • operating fluid is pumped from a cylinder open to the space above the piston into a pressure space below the piston. This moves the piston upwards hydraulically.
  • tensioned counter springs or raised counterweights push the piston back into its lower starting position.
  • a disadvantage of this known device is that it only generates an upward pressure force on one side. When the engine is switched off and the transition from the upper end position to the lower end position, the device itself does not generate any force, but the downward piston movement takes place due to a force acting on the piston rod from the outside.
  • the invention has for its object to provide an electrohydraulic device that generates not only an upward pressure force on the piston rod, but also a downward force, whereby it is as easy to manufacture.
  • a second centrifugal pump is provided below the first centrifugal pump, that both centrifugal pumps are connected to the storage space via a feedthrough, that the cylinder space above the piston is closed with respect to the storage space, in a predetermined direction of rotation the first centrifugal pump of the electric motor and, in the opposite direction of rotation, the second centrifugal pump is driven via the shaft while the other centrifugal pump is running freely, and that when the second centrifugal pump is operating, the operating fluid is conveyed via the pressure line into the cylinder space above the piston and the piston as a result of the acting pressure is moved down, whereby the piston rod experiences a downward pulling force.
  • a second centrifugal pump is provided on the shaft below the first centrifugal pump, which is connected on the one hand to the first centrifugal pump and on the other hand to the storage space, that the cylinder is above the Piston is open to the storage space and the surface of the operating liquid is above the cylinder, that in a predetermined direction of rotation of the electric motor, the first centrifugal pump and in the opposite direction of rotation, the second centrifugal pump is driven via the shaft while the other centrifugal pump is running freely, and that when the second centrifugal pump is operating, the operating fluid is conveyed into the cylinder space above the piston and the piston is moved downward as a result of the pressure acting on it, as a result of which the piston rod experiences a downward pulling force.
  • This electrohydraulic device generates a lifting and pulling force depending on the direction of rotation of the motor. With a given direction of rotation of the motor, one of the two centrifugal pumps is driven while the other centrifugal pump is running freely. Depending on the direction of rotation of the motor, the operating fluid is conveyed below or above the piston, thus generating an upward or downward pressure.
  • a lifting and a pulling force or generally two oppositely directed forces can be generated by means of a differential piston.
  • the advantage of the electro-hydraulic device compared to the differential piston is that no active control elements are required, but the control is taken over by the passive system itself.
  • an electric motor 2 is arranged below the housing 1.
  • a piston 4 is provided in the cylinder 3 and is connected to a piston rod 5.
  • the piston space divides the cylinder space into an upper cylinder space 6 and a lower cylinder space 7.
  • the size of the upper and lower cylinder space depends on the position of the piston.
  • the cylinder 3 is closed above the piston 4 with respect to the storage space 14, whereby a closed system is formed.
  • the piston rod 5 is guided through the cylinder wall by means of a seal 8.
  • the housing 1 has a bushing 9 for the piston rod 5, a dirt scraper 11 being provided in the upper part of the bushing 9 and an outer seal 10 guided around the piston rod 5 in the lower part.
  • the pump pressure only acts the inner seal 8, while the heating pressure of the operating fluid acts only on the outer seal 10.
  • a pump housing 12 for the two centrifugal pumps is located directly below the cylinder 3.
  • a reservoir 14 for the operating fluid is formed between the wall 13 of the housing 1 on the one hand and the cylinder 3 and the pump housing 12.
  • the level of the operating fluid in the storage space is dimensioned such that a closed circuit with a communicating effect is established in the working space of the closed system.
  • a shaft 15 is driven by the electric motor 2 and protrudes into the pump housing 12 via a sealing passage 16 of the housing 1.
  • the shaft 15 is connected to the two centrifugal pumps within the pump housing.
  • the two centrifugal pumps are formed by the impellers 17 and 18 and the flow body 19 in one unit.
  • the two impellers 17 and 18 are connected to the shaft 15 via a freewheel 20. It is thereby achieved that, depending on the direction of rotation of the electric motor, one of the two impellers is carried along and the corresponding centrifugal pump is driven while the other impeller and the centrifugal pump assigned to it run freely.
  • the impellers 17 and 18 are mounted on the shaft 15 facing each other.
  • the flow body 19 is designed as a hollow cylinder, the flow body 19 being at a distance from the impellers 17 and 18 and its cylindrical surfaces being approximately adapted to the course of the impellers.
  • the flow body 19 has a bushing 21 and then the pump housing 12 has a bushing 22. These two bushings 21, 22 are required for the operation in the closed system. Via these two bushings, the storage space 14 for the operating fluid is connected to the interior of the flow body 19 in order to enable the volume compensation for the retracting and extending piston rod.
  • the system thus works in a closed circuit, with the storage room, the two cylinder rooms and the pressure pipe in communicating connection with one another.
  • the electrohydraulic device is designed as an open system, ie the cylinder 3 is open at the top and the surface 26 of the operating fluid is above the cylinder 3.
  • the same parts as in the embodiment in FIG 1 provided with the same reference numerals.
  • the pump housing 12 is open on its lower side, so that the impeller 18 of the second centrifugal pump can directly suck in the operating fluid when rotating in the intended direction of rotation.
  • the flow body 25 between the impellers 17 and 18 is adapted to the shape of the impellers. Since it is an open system, the openings 21 and 22 provided in FIG. 1 are not necessary in this exemplary embodiment.
  • the pressure pipe 24 required in FIG. 1 can also be omitted, since the cylinder 3 in the exemplary embodiment in FIG. 2 lies within the operating fluid in the antechamber 14. Otherwise, the method of operation in the exemplary embodiment according to FIG. 2 takes place in the same manner as is described in the functional representation of FIG. 1.
  • the formation of the first and second centrifugal pumps by means of the impellers 17 and 18 and the flow body 19 or 25 represents a simple and inexpensive implementation of the two centrifugal pumps.
  • the freewheel sleeves 20 it is also possible to reverse one of the two impellers by simply reversing the direction of rotation of the electric motor and to put one of the two centrifugal pumps into operation while the other centrifugal pump is running freely.
  • Different tensile and compressive forces can be achieved by different diameters of the two impellers 17 and 18.
  • the electrohydraulic device can optionally also be operated in a position in which the piston rod is not arranged in the vertical direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Actuator (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
EP92922852A 1991-11-12 1992-10-30 Elektrohydraulisches gerät Expired - Lifetime EP0612378B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4137103A DE4137103C2 (de) 1991-11-12 1991-11-12 Elektrohydraulisches Gerät
DE4137103 1991-11-12
PCT/EP1992/002486 WO1993010361A1 (de) 1991-11-12 1992-10-30 Elektrohydraulisches gerät

Publications (2)

Publication Number Publication Date
EP0612378A1 EP0612378A1 (de) 1994-08-31
EP0612378B1 true EP0612378B1 (de) 1995-12-06

Family

ID=6444570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92922852A Expired - Lifetime EP0612378B1 (de) 1991-11-12 1992-10-30 Elektrohydraulisches gerät

Country Status (10)

Country Link
US (1) US5519995A (sk)
EP (1) EP0612378B1 (sk)
JP (1) JPH07503781A (sk)
CA (1) CA2112357C (sk)
CZ (1) CZ289626B6 (sk)
DE (2) DE4137103C2 (sk)
ES (1) ES2080523T3 (sk)
HU (1) HU213343B (sk)
SK (1) SK280931B6 (sk)
WO (1) WO1993010361A1 (sk)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481834A (zh) * 2014-11-14 2015-04-01 宁波李氏实业有限公司 一种柱塞泵

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2140715T3 (es) * 1994-11-07 2000-03-01 Hobourn Automotive Ltd Bomba rotativa y conjunto de motor.
US5778671A (en) * 1996-09-13 1998-07-14 Vickers, Inc. Electrohydraulic system and apparatus with bidirectional electric-motor/hydraulic-pump unit
DK153197A (da) * 1997-12-23 1999-06-24 Anders Sten Wedell Hydraulenhed
JPH11240492A (ja) * 1998-02-23 1999-09-07 Showa Corp 船外機のチルトロック装置
DE10013194B4 (de) 2000-03-17 2005-02-24 Festo Ag & Co.Kg Antriebsvorrichtung
JP2002240788A (ja) * 2001-02-13 2002-08-28 Showa Corp 船舶推進機用チルト装置
FR2831226B1 (fr) * 2001-10-24 2005-09-23 Snecma Moteurs Actionneur electrohydraulique autonome
US20080289327A1 (en) * 2004-10-08 2008-11-27 Rolf Mintgen Linear Drive
US8448432B2 (en) * 2007-02-13 2013-05-28 The Board Of Regents Of The University Of Texas System Actuators
JP2010190303A (ja) * 2009-02-17 2010-09-02 Itec Co Ltd 複動式流体圧シリンダ
US20100300279A1 (en) * 2009-06-02 2010-12-02 George Kadlicko Point Of Use Actuator
DE102016109103A1 (de) 2016-05-18 2017-11-23 Hoerbiger Automatisierungstechnik Holding Gmbh Elektrohydraulischer Linearaktuator
US9915073B1 (en) * 2016-12-12 2018-03-13 Andrew Hood Rainscreen building siding
DE102017206719B4 (de) * 2017-04-21 2020-10-22 Pintsch Bubenzer Gmbh Stellzylinderanordnung für ein Bremslüftgerät, Bremslüftgerät und Bremsanordnung
CA3073109A1 (en) * 2017-08-16 2019-02-21 Kyntronics Llc Electrohydraulic actuator
TWI708895B (zh) * 2019-08-28 2020-11-01 黃國洪 泵浦

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB379124A (en) * 1930-10-02 1932-08-25 British Thomson Houston Co Ltd Improvements in and relating to electro-hydraulic apparatus
DE842440C (de) * 1949-10-28 1952-06-26 Elektro Mechanik G M B H Elektrohydraulische Verstellvorrichtung mit eingebautem Motor und unmittelbar oberhalb desselben angeordneter Pumpe
US2918795A (en) * 1955-09-06 1959-12-29 Ramsey Corp Electro-hydraulic actuating cylinder
DE1690019B2 (de) * 1967-08-04 1972-12-14 Befestigungsfuss einer fuehrungsschiene zum seitlichen fuehren und halten steckbarer flachbaugruppen
JPS52102975A (en) * 1976-02-24 1977-08-29 Toyota Motor Corp Hydraulic driving system
DE2929442A1 (de) * 1979-07-20 1981-01-29 Elmeg Elektrohydraulisches stellgeraet
DE3607419C1 (en) * 1986-03-06 1987-01-15 Detlef Koeppen Pressure-medium-operated cylinder/pump unit
JPH107975A (ja) * 1996-06-28 1998-01-13 Daicel Chem Ind Ltd 水分散性被覆組成物

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481834A (zh) * 2014-11-14 2015-04-01 宁波李氏实业有限公司 一种柱塞泵
CN104481834B (zh) * 2014-11-14 2016-04-27 宁波李氏实业有限公司 一种柱塞泵

Also Published As

Publication number Publication date
CA2112357C (en) 2000-08-01
SK54494A3 (en) 1994-10-05
HUT68102A (en) 1995-05-29
DE59204627D1 (de) 1996-01-18
EP0612378A1 (de) 1994-08-31
CZ289626B6 (cs) 2002-03-13
JPH07503781A (ja) 1995-04-20
HU9401484D0 (en) 1994-08-29
HU213343B (en) 1997-05-28
CA2112357A1 (en) 1993-05-27
WO1993010361A1 (de) 1993-05-27
ES2080523T3 (es) 1996-02-01
DE4137103A1 (de) 1993-05-13
US5519995A (en) 1996-05-28
CZ115994A3 (en) 1994-12-15
DE4137103C2 (de) 1994-02-17
SK280931B6 (sk) 2000-09-12

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