EP0735275A2 - Dispositif à crans - Google Patents

Dispositif à crans Download PDF

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Publication number
EP0735275A2
EP0735275A2 EP96100338A EP96100338A EP0735275A2 EP 0735275 A2 EP0735275 A2 EP 0735275A2 EP 96100338 A EP96100338 A EP 96100338A EP 96100338 A EP96100338 A EP 96100338A EP 0735275 A2 EP0735275 A2 EP 0735275A2
Authority
EP
European Patent Office
Prior art keywords
check valve
valve
switching
unlockable
switching device
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
EP96100338A
Other languages
German (de)
English (en)
Other versions
EP0735275A3 (fr
EP0735275B1 (fr
Inventor
Rüdiger Dipl.-Ing. Jung
Harald Dipl.-Ing. Bär
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.)
Hydac Fluidtechnik GmbH
Original Assignee
Flutec Fluidtechnische Geraete 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 Flutec Fluidtechnische Geraete GmbH filed Critical Flutec Fluidtechnische Geraete GmbH
Publication of EP0735275A2 publication Critical patent/EP0735275A2/fr
Publication of EP0735275A3 publication Critical patent/EP0735275A3/fr
Application granted granted Critical
Publication of EP0735275B1 publication Critical patent/EP0735275B1/fr
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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices

Definitions

  • the invention relates to a switching device for controlling at least one hydraulic actuating device with two counter-acting check valves in an inlet and outlet line, which are connected to the respective actuating device and to a switching valve.
  • Comparable switching devices such as are known from DE 35 24 759 A1, are used, for example, if the actuating device is a hydraulic cylinder, to allow the piston rod of the hydraulic cylinder to be extended and retracted for an actuation process.
  • the two counter-acting check valves are alternately activated once for the flow of the fluid for a movement cycle.
  • Unlockable check valves which can be unlocked hydraulically via a control line and which are used, for example, to prevent Creeping movements are used on cylinders controlled by slide valves, which are under load or to shut off pressurized parts of the system, such as press cylinders, as well as to avoid uncontrolled movements of consumers under load, for example in the event of a pipe break or pump failure.
  • Such areas of application can be found, among other things, in injection molding machines, aerial work platforms, support cylinders, in mobile and clamping hydraulics as well as in handling equipment.
  • a hydraulic actuating device for a movement in different directions, but also to hold it in a kind of floating position within a predetermined range of motion when the actuating device is under changing load.
  • This can play a role, for example, in agricultural machines in which a tillage implement, such as a plow, should remain in engagement with the soil to be worked under load and not be lifted off from it, even if the tillage implement itself is dependent on the type of soil or the course of the soil itself experiences a retroactive force that leads directly to at least brief lifting of the tillage implement in other constructions.
  • the invention has for its object to provide a switching device for controlling at least one hydraulic actuating device, with which it is possible to achieve the above-mentioned floating position for such actuating devices inexpensively and reliably with few components.
  • a relevant object is achieved by a switching device with the features of claim 1.
  • the switching device is used to control at least one hydraulic actuating device which is formed from a double-acting hydraulic cylinder 10 in which a piston 12 is held in a longitudinally displaceable manner. Protruding on both sides of the hydraulic cylinder 10 and connected to the piston 12 there is a piston rod 14 which serves to introduce the force, the piston 12 dividing the hydraulic cylinder 10 into the two working spaces 16 and 18 and on its two facing the working spaces 16 and 18 Has sides of equal piston area.
  • the switching device has two counter-acting check valves 20, 22 in an inlet line 24 and an outlet line 26, which are connected to the respective actuating device and to a switching valve 28.
  • the switching valve 28 is designed as a slide valve, in particular as a 4/3-way valve. In its middle switching or latching position, it separates the inlet line 24 and the outlet line 26 from a hydraulic pump P and the tank T.
  • the two check valves 30 and 32 can be hydraulically unlocked and between the first check valve 20 and the switching valve 28 the control line 38 of the second unlockable check valve 32 opens into the inlet line 24.
  • the lock connection 40 of the first unlockable check valve 30 in turn opens in the fluid direction behind the first check valve 20 into the feed line 24 to the hydraulic cylinder 10.
  • the flow connection 42 of the first unlockable check valve 30 is connected in the discharge line 26 to the flow connection 44 of the second check valve 22 and the drain line 26 is connected to the flow connection 46 of the second unlockable check valve 32.
  • the discharge line 26 is connected to the hydraulic pump P in a fluid-carrying manner. If the pressure that can be generated by the hydraulic pump P in the discharge line 26 exceeds a predeterminable threshold value, for example> 10 bar, the second unlockable check valve 32 is opened via the flow connection 46 and the fluid pressure then present in the blocking connection 36 and in the control line 34 also becomes the first unlockable check valve 30 opened. This opening process also occurs when there is no pressure in the control line 38.
  • a predeterminable threshold value for example> 10 bar
  • this non-return valve remains closed and the two working spaces 16 and 18 of the actuating device are connected to one another in a fluid-carrying and pressure-compensating manner via the opened first unlockable non-return valve 30.
  • an oil volume is clamped in the blocking connection 36 and in the control line 34, as a result of which the switching position “lowering” is virtually stored and the floating position for the piston 12 of the hydraulic cylinder results.
  • This floating position is maintained even if the operator no longer actuates the switching valve 28 and moves it back into its middle rest or rest position shown in FIG. 1, for example spring-loaded.
  • Check valves 30, 32 that can be unlocked in this regard are directly controlled ball seat valves with a closing ball 48 for oil-hydraulic systems. They allow free flow in the flow direction from the respective flow connection 42, 46 to the blocking connection 36 or 40. In the opposite direction, the closing ball 48 is pressed onto the valve seat by the closing spring 50 and by the pressure at the respective blocking connection 36, 40 and blocks the flow direction mentioned without leakage oil. By introducing a sufficiently high control pressure on the respective control line 34, 38, the control piston 52 is then displaced and the closing ball 48 is pressed off its valve seat. The valve is then hydraulically unlocked and can be flowed through by the respective blocking connection 36, 40 to the associated flow connection 42 or 46.
  • the return spring inserted under the control piston 52 enables a delay-free downshift when the pressure on the respective control line 34, 38 is relieved.
  • the respective unlockable check valve 30, 32 on the respective control piston 52 as shown in FIG between the respective control line 34, 38 and the associated one Passage connection 42,46 and the associated blocking connection 36,40 each have a seal 54, for example in the form of a conventional O-ring.
  • the switching device described can be used particularly advantageously in agricultural machines in which a piece of equipment, such as a plow or a tedder, has to remain in constant engagement or in contact with the soil to be worked.
  • the switching device can also be used to control a plurality of actuating devices, for example connected in parallel and connected to one another, for a floating mounting of the working equipment. Further areas of application of the switching device in road construction or in street sweepers and in transport vehicles are possible.
EP96100338A 1995-03-29 1996-01-11 Dispositif à crans Expired - Lifetime EP0735275B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19511522 1995-03-29
DE19511522A DE19511522C1 (de) 1995-03-29 1995-03-29 Rastschaltvorrichtung

Publications (3)

Publication Number Publication Date
EP0735275A2 true EP0735275A2 (fr) 1996-10-02
EP0735275A3 EP0735275A3 (fr) 1998-04-22
EP0735275B1 EP0735275B1 (fr) 2002-09-18

Family

ID=7758059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100338A Expired - Lifetime EP0735275B1 (fr) 1995-03-29 1996-01-11 Dispositif à crans

Country Status (5)

Country Link
US (1) US5699714A (fr)
EP (1) EP0735275B1 (fr)
JP (1) JPH08320001A (fr)
AT (1) ATE224510T1 (fr)
DE (2) DE19511522C1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10149787B4 (de) * 2000-10-23 2012-06-06 Linde Material Handling Gmbh Ventilanordnung mit Schwimmstellung
US8469677B1 (en) * 2007-10-01 2013-06-25 Sauer-Danfoss Inc. Check valve pump with electric bypass valve
DE102008036876A1 (de) * 2008-08-07 2010-04-15 Schaeffler Kg Nockenwellenverstellvorrichtung für eine Brennkraftmaschine
CN103697315A (zh) * 2013-12-12 2014-04-02 广西壮族自治区特种设备监督检验院 游乐设施用肩式安全压杠锁紧机构
DE102015216833A1 (de) * 2015-09-03 2017-03-09 Robert Bosch Gmbh Entsperrbares Rückschlagventil für ein Schieberventil, Verfahren zum Ansteuern des entsperrbaren Rückschlagventils und Schieberventil mit dem entsperrbaren Rückschlagventil
DE102016214767A1 (de) * 2016-02-16 2017-08-17 Sms Group Gmbh Gleichgangzylinder für Strangpressanlagen
CN114135532A (zh) * 2021-10-11 2022-03-04 烟台艾迪精密机械股份有限公司 一种并联集成式多级单向阀

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463187A (en) * 1968-02-07 1969-08-26 Gen Signal Corp Hydraulically operated power steering circuit
US4169490A (en) * 1977-06-03 1979-10-02 Taplin John F Pilot operated four way valve
JPS5670105A (en) * 1979-11-13 1981-06-11 Mitsuwa Seiki Co Ltd Oil jack
DE3524759A1 (de) * 1985-07-11 1987-01-22 Bosch Gmbh Robert Wegeventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4362018A (en) * 1980-06-12 1982-12-07 Kobe Steel, Ltd. Hydraulic rotation control circuit
JPH0452087Y2 (fr) * 1988-11-14 1992-12-08
DE4105459A1 (de) * 1991-02-21 1992-08-27 Heilmeier & Weinlein Hydraulische steuervorrichtung
US5351601A (en) * 1992-05-04 1994-10-04 Control Concepts, Inc. Hydraulic control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463187A (en) * 1968-02-07 1969-08-26 Gen Signal Corp Hydraulically operated power steering circuit
US4169490A (en) * 1977-06-03 1979-10-02 Taplin John F Pilot operated four way valve
JPS5670105A (en) * 1979-11-13 1981-06-11 Mitsuwa Seiki Co Ltd Oil jack
DE3524759A1 (de) * 1985-07-11 1987-01-22 Bosch Gmbh Robert Wegeventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 135 (M-085), 27.August 1981 & JP 56 070105 A (SANWA SEIKI K.K.), 11.Juni 1981, *

Also Published As

Publication number Publication date
JPH08320001A (ja) 1996-12-03
US5699714A (en) 1997-12-23
ATE224510T1 (de) 2002-10-15
EP0735275A3 (fr) 1998-04-22
DE59609666D1 (de) 2002-10-24
EP0735275B1 (fr) 2002-09-18
DE19511522C1 (de) 1996-07-18

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