EP1176315A3 - Controllable changeover valve - Google Patents

Controllable changeover valve Download PDF

Info

Publication number
EP1176315A3
EP1176315A3 EP01111865A EP01111865A EP1176315A3 EP 1176315 A3 EP1176315 A3 EP 1176315A3 EP 01111865 A EP01111865 A EP 01111865A EP 01111865 A EP01111865 A EP 01111865A EP 1176315 A3 EP1176315 A3 EP 1176315A3
Authority
EP
European Patent Office
Prior art keywords
pressure
input line
spring element
valve piston
changeover
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
EP01111865A
Other languages
German (de)
French (fr)
Other versions
EP1176315B1 (en
EP1176315A2 (en
Inventor
Reinhold Schniederjan
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.)
Brueninghaus Hydromatik GmbH
Original Assignee
Brueninghaus Hydromatik 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 Brueninghaus Hydromatik GmbH filed Critical Brueninghaus Hydromatik GmbH
Publication of EP1176315A2 publication Critical patent/EP1176315A2/en
Publication of EP1176315A3 publication Critical patent/EP1176315A3/en
Application granted granted Critical
Publication of EP1176315B1 publication Critical patent/EP1176315B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • 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
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/25—Pressure control functions
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3127—Floating position connecting the working ports and the return line
    • 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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/30—Directional control
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means

Abstract

Ein steuerbares Umschaltventil (1) weist eine erste Eingangsleitung (2), eine zweite Eingangsleitung (3) und eine Ausgangsleitung (4) auf. Ferner ist ein erstes Federelement (18) vorgesehen, das zum Vorgeben eines maximalen Umschaltdrucks auf einen Ventilkolben (11) einwirkt. Eine entgegen dem ersten Federelement (18) auf den Ventilkolben (11) einwirkende Umschaltdruck-Reduktionseinrichtung (30) weist ein betätigbares Steuerglied (33) und ein zweites Federelement (31) auf zum Reduzieren des durch das erste Federelement (18) vorgegebenen Umschaltdrucks auf einen reduzierten Umschaltdruck durch Spannen des zweiten Federelementes (31). Dabei verbindet der Ventilkolben (11) die Ausgangsleitung (4) mit der ersten Eingangsleitung (2), wenn der Druck (PE1) in der ersten Eingangsleitung (2) größer als der Umschaltdruck ist und der Ventilkolben (11) verbindet die Ausgangsleitung (4) mit der zweiten Eingangsleitung (3), wenn der Druck (PE1) in der ersten Eingangsleitung (2) kleiner als der Umschaltdruck ist.

Figure 00000001
A controllable changeover valve (1) has a first input line (2), a second input line (3) and an output line (4). A first spring element (18) is also provided, which acts on a valve piston (11) in order to specify a maximum switching pressure. A switching pressure reduction device (30) acting against the first spring element (18) on the valve piston (11) has an actuatable control member (33) and a second spring element (31) for reducing the switching pressure specified by the first spring element (18) to a reduced switching pressure by tensioning the second spring element (31). The valve piston (11) connects the output line (4) to the first input line (2) when the pressure (P E1 ) in the first input line (2) is greater than the changeover pressure and the valve piston (11) connects the output line (4 ) with the second input line (3) when the pressure (P E1 ) in the first input line (2) is less than the changeover pressure.
Figure 00000001
EP01111865A 2000-07-21 2001-05-16 Controllable changeover valve Expired - Lifetime EP1176315B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10035628A DE10035628C2 (en) 2000-07-21 2000-07-21 Controllable switch valve
DE10035628 2000-07-21

Publications (3)

Publication Number Publication Date
EP1176315A2 EP1176315A2 (en) 2002-01-30
EP1176315A3 true EP1176315A3 (en) 2003-11-12
EP1176315B1 EP1176315B1 (en) 2004-12-29

Family

ID=7649790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01111865A Expired - Lifetime EP1176315B1 (en) 2000-07-21 2001-05-16 Controllable changeover valve

Country Status (2)

Country Link
EP (1) EP1176315B1 (en)
DE (2) DE10035628C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224293B4 (en) * 2012-12-21 2015-11-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device for applying a fluid with alternating pressure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420011A (en) * 1981-12-08 1983-12-13 Harry Roger Dual piston sensing mechanism
DE3307242A1 (en) * 1983-03-02 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Relief valve in a hydraulic system
US4756156A (en) * 1985-10-04 1988-07-12 Hydromatik Gmbh Drive system with two hydrostatic gears
DE3933393A1 (en) * 1989-10-06 1991-04-18 Teves Gmbh Alfred Minimum element directional control valve - makes use of lower pressure to activate piston
US5333451A (en) * 1992-04-24 1994-08-02 Kanzaki Kokyukoki Mfg. Co., Ltd. Oil pressure control valve assembly for hydrostatic transmissions
EP0740083A2 (en) * 1995-03-31 1996-10-30 Brueninghaus Hydromatik Gmbh Pressure cut-off valve with a shuttle valve piston
DE19642567C1 (en) * 1996-10-15 1997-08-21 Brueninghaus Hydromatik Gmbh Combined hydraulic valve with switching and pressure reduction functions e.g. for holding brake

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420011A (en) * 1981-12-08 1983-12-13 Harry Roger Dual piston sensing mechanism
DE3307242A1 (en) * 1983-03-02 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Relief valve in a hydraulic system
US4756156A (en) * 1985-10-04 1988-07-12 Hydromatik Gmbh Drive system with two hydrostatic gears
DE3933393A1 (en) * 1989-10-06 1991-04-18 Teves Gmbh Alfred Minimum element directional control valve - makes use of lower pressure to activate piston
US5333451A (en) * 1992-04-24 1994-08-02 Kanzaki Kokyukoki Mfg. Co., Ltd. Oil pressure control valve assembly for hydrostatic transmissions
EP0740083A2 (en) * 1995-03-31 1996-10-30 Brueninghaus Hydromatik Gmbh Pressure cut-off valve with a shuttle valve piston
DE19642567C1 (en) * 1996-10-15 1997-08-21 Brueninghaus Hydromatik Gmbh Combined hydraulic valve with switching and pressure reduction functions e.g. for holding brake

Also Published As

Publication number Publication date
EP1176315B1 (en) 2004-12-29
DE10035628A1 (en) 2002-02-07
DE10035628C2 (en) 2002-06-06
EP1176315A2 (en) 2002-01-30
DE50104934D1 (en) 2005-02-03

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