EP0419810B1 - Hydraulikaggregat - Google Patents

Hydraulikaggregat Download PDF

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Publication number
EP0419810B1
EP0419810B1 EP90114822A EP90114822A EP0419810B1 EP 0419810 B1 EP0419810 B1 EP 0419810B1 EP 90114822 A EP90114822 A EP 90114822A EP 90114822 A EP90114822 A EP 90114822A EP 0419810 B1 EP0419810 B1 EP 0419810B1
Authority
EP
European Patent Office
Prior art keywords
pump
volume
cylinder
piston
hydraulic
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
EP90114822A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0419810A1 (de
Inventor
Dietmar Lindner
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.)
Lukas Hydraulik GmbH
Original Assignee
FAG Kugelfischer Georg Schaefer KGaA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6390364&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0419810(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by FAG Kugelfischer Georg Schaefer KGaA filed Critical FAG Kugelfischer Georg Schaefer KGaA
Publication of EP0419810A1 publication Critical patent/EP0419810A1/de
Application granted granted Critical
Publication of EP0419810B1 publication Critical patent/EP0419810B1/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 a hydraulic unit for driving a tool according to the preamble of claim 1.
  • the unit cannot be operated in any position, but only as long as the hydraulic fluid covers the suction opening of the pump, i.e.: especially with the often rough use of the emergency services, it cannot be ruled out that valuable Time is lost due to the fact that a suitable installation location of the unit must be found to ensure that the pump does not draw in air.
  • DE-A-36 03 109 discloses a hydraulic hand pump for actuating cable shoe presses and other hydraulic tools.
  • the working cylinder and the hydraulic pump are arranged coaxially in a common housing.
  • the working cylinder has a high-pressure chamber and the hand pump consists of a low-pressure cylinder in which a low-pressure piston is slidably arranged.
  • a high-pressure piston is arranged in a concentric bore of the low-pressure piston and forms the boundary of a high-pressure cylinder located in the low-pressure piston.
  • a pressure medium reservoir is arranged on the housing, which is delimited by a flexible membrane and is connected to the low-pressure chamber of the hand pump via valves. This reservoir contains the complete volume of hydraulic fluid required to operate the hydraulic tool.
  • the membrane arranged in the storage container ensures that the suction connection of the pump is surrounded by hydraulic fluid in every position of the unit, so that the suction of air is excluded. Since the entire working volume must be accommodated in the storage tank, the space requirement is also high for this pump. If, as is necessary with rescue equipment, high forces are used and large strokes of the cylinder are necessary, the unit known from DE-A-36 03 109 builds too long, so that its handling is tedious for the operator.
  • a hydraulic work unit which with a double-acting hydraulic cylinder designed as a differential cylinder; a container with a diaphragm delimiting a compensation space; a pump and a switching valve is provided.
  • the differential cylinder and the compensation chamber are on two Arranged on different axes, so that relatively large dimensions result, and separate pipeline arrangements are also necessary, as a result of which a large number of sealing and connecting points are created, which naturally have the disadvantages of industrial manufacturing tolerances.
  • the invention is therefore based on the object of providing a hydraulic unit for driving a tool which has a compact design, with which high forces can be generated and in which a safe suction of the pump is ensured in any position.
  • the differential cylinder 1 and the pump 2 are accommodated in a common cylinder housing 15.
  • the piston 10 In the interior of the differential cylinder 1, the piston 10 is slidably mounted with the piston rod 11 attached to it and guided out of the cylinder housing 15.
  • the piston 10 has a circumferential groove 19, in which a sealing ring 24 is inserted, so that two different, variable pressure spaces 1a, 1b are set on both sides of the piston 10, depending on its current position in the cylinder housing 15.
  • the pressurizable pressure chamber 1a is delimited by the piston foot 10a and the cylinder base, the pressure chamber 1b, which can also be pressurized, is formed by the piston head 10b and the partition 16 effective in the differential cylinder 1.
  • the partition 16 is arranged at a distance from the cylinder cover 9 and forms with it a closed space within the differential cylinder 1. Between the partition 16 and the cylinder cover 9, a membrane 18 is arranged such that through the membrane 18 and the partition 16 a variable compensation space 1c is created.
  • Each of the pressure chambers 1a, 1b is operatively connected to the pump 2 via a hydraulic line 6 or 7.
  • a line 8 provided in the cylinder housing 15 opens into the compensation chamber 1c.
  • the commercially available membrane 18 is arranged in the differential cylinder 1 so that it is relaxed in its Position ( Figure 1) to close to the partition 16 and the mouth of the line 8 separates from an existing in the cylinder cover 9 designated 17 atmospheric connection.
  • the membrane 18 must be arranged so that the volume of the compensation space 1c formed between it and the partition 16 in the loaded state of the membrane 18 increases at least the volume of the piston rod 11 completely retracted into the differential cylinder 1 by the compression volume of the hydraulic fluid (at maximum force) and the stroke volume (the delivery rate) of pump 2.
  • the partition 16 or the compensation chamber 1c can be formed in the differential cylinder 1 in a very simple and effective manner by a plug which can be screwed into the cylinder bore.
  • the plug is provided at its end facing the piston crown 10b with a radial sealing ring 13, which ensures that no hydraulic fluid can escape into the compensation chamber 1c from the pressure chamber 1b.
  • the pump 2 is a conventional piston pump with a smaller stroke volume than that of the differential cylinder 1.
  • the pump piston 22 is slidably mounted via a sealing ring 29 in a known manner.
  • the pump piston rod 23 attached to the pump piston 22 has at its end facing away from the pump piston 22 an articulated pump lever 30, which slides on a bolt 32 fixed to the housing via an elongated hole 31 arranged approximately in the middle of its longitudinal extent is.
  • the choice of the size of the pump 2 depends on the maximum number of pump strokes with which the differential cylinder 1 should be able to be moved from the retracted to the extended position.
  • the hydraulic line 6 and the hydraulic line 7 lead from the differential cylinder 1 to the changeover valve 3 designed as a 4/2-way valve and from the changeover valve 3 the pressure line 6 'and suction line 7' via the check valves 4 and 5 integrated therein to the pump 2.
  • the check valves 4, 5 are arranged such that the fluid flow to the pump 2 can only flow via the suction line 7 'and away from the pump 2 only via the pressure line 6'. Between the check valve 4 and the changeover valve 3, the further line 8 branches off from the suction line 7 ′ and, as already mentioned, opens into the equalization chamber 1c.
  • FIG. 1 shows the differential cylinder 1 in the basic position, the piston 10 not yet having traveled any distance in this illustration, that is to say it is still in the rest position.
  • the changeover valve 3 is switched so that hydraulic fluid can get from the pump 2 via the check valve 5 or the pressure line 6 'into the hydraulic line 6 and from there into the pressure chamber 1a of the differential cylinder 1.
  • the hydraulic fluid located in the cylinder chamber 21 of the pump 2 is conducted into the pressure chamber 1a of the differential cylinder 1 with each compression stroke (direction k), so that the piston 10 moves to the right in the drawing emotional.
  • the volume displaced by the piston 10 flows from the pressure chamber 1b via the hydraulic line 7, suction line 7 'and, since the check valve 4 is blocked by the pressure build-up in the pressure chamber 21 of the pump 2, via the line 8 into the compensation chamber 1c.
  • the diaphragm 18 assumes the position shown in broken lines in FIG. 1, the volume then enclosed by the diaphragm 18 and the partition wall 16 being the pump volume of the pump 2 plus the displacement volume of the part of the piston rod 11 which is in the Pressure chamber 1a is immersed, minus the compression volume of the hydraulic fluid.
  • the compression volume of the hydraulic fluid since it is also required in the pressure chamber 1a to build up pressure, can only be obtained again from the compensation chamber 1c. Since the diaphragm 18, on the other hand, is operatively connected to the atmosphere via the connection 17, only the pressure force exerted on the hydraulic fluid by the tensioning force of the diaphragm acts in the hydraulic line 7, suction line 7 '.
  • a compression spring 14 which is supported on the cylinder cover 9 on the one hand and on the side of the diaphragm 18 facing away from the compensation space 1c on the other hand, can additionally be provided (FIG. 4).
  • the check valve 4 opens, so that the volume in the compensation chamber 1c flows back via the lines 8, suction line 7 'into the pressure chamber 21 of the pump 2.
  • the spring-loaded check valve 5 blocks the pressure line 6 ', so that the piston 10 maintains its position. This process is repeated until the piston 10 reaches its end position shown in FIG. 2 has taken.
  • the spreading arms 27 and 28 are then fully open.
  • the membrane 18 also ensures that the mouth of the line 8, which is decisive for the reliable suction, in the compensation chamber 1c is surrounded by hydraulic fluid in every position of the differential cylinder 1, and thus the pump 2 can always prime.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Shearing Machines (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP90114822A 1989-09-28 1990-08-02 Hydraulikaggregat Expired - Lifetime EP0419810B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3932354 1989-09-28
DE3932354 1989-09-28

Publications (2)

Publication Number Publication Date
EP0419810A1 EP0419810A1 (de) 1991-04-03
EP0419810B1 true EP0419810B1 (de) 1993-09-22

Family

ID=6390364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90114822A Expired - Lifetime EP0419810B1 (de) 1989-09-28 1990-08-02 Hydraulikaggregat

Country Status (8)

Country Link
US (1) US5105622A (zh)
EP (1) EP0419810B1 (zh)
JP (1) JP2736336B2 (zh)
KR (1) KR0180720B1 (zh)
CN (1) CN1022946C (zh)
DE (1) DE59002832D1 (zh)
PL (1) PL164839B1 (zh)
RU (1) RU1838229C (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011009044A1 (de) 2011-01-20 2012-07-26 Lukas Hydraulik Gmbh Entlüftungsvorrichtung

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251445A (en) * 1991-10-03 1993-10-12 Hydra-Ram Inc. Hand operated hydraulic pump having pressurized reservoir within piston
GB2277354A (en) * 1993-03-15 1994-10-26 Scanlan Thomas Robert Hydraulic piston and cylinder assembly
DE4340142C2 (de) * 1993-11-25 1995-11-23 Abb Patent Gmbh Hydraulikeinrichtung zur Betätigung wenigstens eines linear beweglichen Bauteils
DK153197A (da) * 1997-12-23 1999-06-24 Anders Sten Wedell Hydraulenhed
NL1014253C2 (nl) * 2000-02-01 2001-08-02 Holmatro Ind Equip Hydraulisch gereedschap.
DE102004037697B4 (de) * 2004-08-02 2006-10-19 Andreas Lupold Hydrotechnik Gmbh Hydraulikgerät
US8262063B2 (en) * 2005-04-28 2012-09-11 B.V. Holmatro Industrial Equipment Tool with hydraulic valve system
DE102005060436B4 (de) * 2005-12-15 2010-02-04 Eads Deutschland Gmbh Aktuator
DE102006013615A1 (de) * 2006-03-22 2007-09-27 Andreas Lupold Hydrotechnik Gmbh Hydraulikaggregat mit Schnellhubkolben
CN100344942C (zh) * 2006-04-03 2007-10-24 浙江大学 用于测量油液体积变化量的油腔
DE102013108776A1 (de) 2013-08-13 2015-02-19 Daniel Bormann Mobiles Werkzeug, insbesondere Rettungsgerät, zum Zerstören eines Strukturbauteiles
CN105782165B (zh) * 2014-12-24 2017-09-01 大连光洋科技集团有限公司 一种无动力保压伸缩缸及其应用的夹紧器
US10293192B2 (en) 2015-01-26 2019-05-21 Lukas Hydraulik Gmbh Hydraulic implement
DE202015009638U1 (de) 2015-01-26 2018-09-18 Lukas Hydraulik Gmbh Hydraulisches Arbeitsgerät
DE202015009395U1 (de) 2015-01-26 2017-06-09 Lukas Hydraulik Gmbh Hydraulisches Arbeitsgerät
CN104743101B (zh) * 2015-03-30 2016-08-17 中国民用航空飞行学院 通航飞机起落架收放系统
DE102016102960A1 (de) 2016-02-19 2017-08-24 Viega Technology Gmbh & Co. Kg Vorrichtung und Verfahren zum Übersetzen einer mechanischen Kraft zum Antreiben einer Pressvorrichtung für Pressfittings
CN106272135A (zh) * 2016-08-27 2017-01-04 刘雷 一种超高压多功能手动液压钳
CN112548898B (zh) * 2020-12-02 2022-05-10 深圳市铭仁塑胶模具有限公司 一种注塑模具零件腔孔精加工用辅助固定装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2372393A (en) * 1945-03-27 Control system
US3875850A (en) * 1972-08-30 1975-04-08 Applied Power Inc Double-acting lift cylinder with integral velocity fuses
DE2336249A1 (de) * 1973-07-17 1975-02-06 Hydraulik Zubehoer Ges Fuer Hydraulische arbeitseinheit
DE2410766C3 (de) * 1974-03-07 1983-01-13 Danfoss A/S, 6430 Nordborg Stellvorrichtung mit einem Axial- Stellmotor, insbesondere zur Betätigung von Gasheizungsventilen
DE2524005A1 (de) * 1975-05-30 1976-12-09 Siemens Ag Einrichtung zum betrieb von doppeltwirkenden stellzylindern
DE2630226A1 (de) * 1976-07-06 1978-01-19 Cis Metalform Masch Anordnung an arbeitszylindern
DE2757467A1 (de) * 1977-12-22 1979-07-05 Weber Oelhydraulik Vorrichtung zum verschwenken eines drehpfluges
US4343228A (en) * 1979-01-25 1982-08-10 Wallis Bernard J Hydraulic cylinder arrangement
FR2489897A1 (fr) * 1980-09-10 1982-03-12 Leduc Rene Hydro Sa Ensemble hydraulique autonome
US4513979A (en) * 1983-03-24 1985-04-30 The Warner & Swasey Company Machine tool with chucking controls
DE3603109A1 (de) * 1986-02-01 1987-08-06 Dischler Helmut Hydraulische handpumpe zum betaetigen von kabelschuhpressen und anderen hydraulischen werkzeugen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011009044A1 (de) 2011-01-20 2012-07-26 Lukas Hydraulik Gmbh Entlüftungsvorrichtung
DE102011009044B4 (de) * 2011-01-20 2015-09-10 Lukas Hydraulik Gmbh Entlüftungsvorrichtung

Also Published As

Publication number Publication date
JP2736336B2 (ja) 1998-04-02
PL164839B1 (pl) 1994-10-31
KR910006625A (ko) 1991-04-29
RU1838229C (ru) 1993-08-30
KR0180720B1 (ko) 1999-04-15
EP0419810A1 (de) 1991-04-03
CN1022946C (zh) 1993-12-01
JPH03121714A (ja) 1991-05-23
DE59002832D1 (de) 1993-10-28
CN1050595A (zh) 1991-04-10
US5105622A (en) 1992-04-21

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