EP0236750A2 - Système hydraulique - Google Patents

Système hydraulique Download PDF

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Publication number
EP0236750A2
EP0236750A2 EP19870101602 EP87101602A EP0236750A2 EP 0236750 A2 EP0236750 A2 EP 0236750A2 EP 19870101602 EP19870101602 EP 19870101602 EP 87101602 A EP87101602 A EP 87101602A EP 0236750 A2 EP0236750 A2 EP 0236750A2
Authority
EP
European Patent Office
Prior art keywords
line
pressure
directional control
control valve
pumps
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
EP19870101602
Other languages
German (de)
English (en)
Other versions
EP0236750B1 (fr
EP0236750A3 (en
Inventor
Gottfried Dipl.-Ing Olbrich
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0236750A2 publication Critical patent/EP0236750A2/fr
Publication of EP0236750A3 publication Critical patent/EP0236750A3/de
Application granted granted Critical
Publication of EP0236750B1 publication Critical patent/EP0236750B1/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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open 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
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in 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
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/353—Flow control by regulating means in return line, i.e. meter-out 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • F15B2211/41518—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve being connected to multiple pressure sources
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • F15B2211/5152—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve being connected to multiple pressure sources
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6052—Load sensing circuits having valve means between output member and the load sensing circuit using check valves
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Definitions

  • the invention is based on a hydraulic system according to the preamble of the main claim. In such known systems it has not yet been possible to operate them with an optimal energy balance, since the correct connection of further pumps to the main pump is difficult.
  • the hydraulic system according to the invention with the characterizing features of the main claim has the advantage that an optimal energy balance can be achieved in a multi-pump system.
  • the connection of further pumps is carried out according to requirements and continuously, ie smoothly.
  • only a single pressure compensator is required to regulate two or more pump delivery flows, with demand-dependent flow regulation of both pumps and neutral circulation control of the same.
  • the main consumer can be arranged in a load-sensing circuit, the secondary consumer also or in an open center system.
  • 10 and 11 denote two pumps, of which the pump 10 is the first pump, the pump 11 the second. Both pumps draw in pressure medium from a container, the pump 10 conveys it into a line 12, the pump 11 into a line 13.
  • a line 14 is connected to line 13, which opens into line 12.
  • a check valve 15 is arranged in the line 14 and can open in the direction from the line 13 to the line 12.
  • a pressure relief valve 16 is connected to line 14.
  • the line 13 leads to a pressure compensator 17 with the switching positions I, II, III, which have a smooth transition.
  • a control line 19 extending from line 12 leads to one side of the pressure compensator, and a control line 20 leads to a line 21 on the opposite side.
  • a line leads from one long side of the pressure compensator 22 to line 14, where it opens downstream of the check valve 15, from the opposite side a line 23 leads to the return line 24.
  • the line 21 merges into the return line 24 at the end of the valve block.
  • valve block there are three directional control valves 26 to 28, of which consumer lines (not further specified) lead to corresponding consumers.
  • a directional control valve In each working position of a directional control valve there is an orifice plate which has the index numbers A and B corresponding to the directional control valves.
  • a line 29 to 31 leads to the return line from each directional control valve, and a control line 32 to 34 leads to line 21; this is a signal line or a load sensing line.
  • a shuttle valve 35 to 37 At each junction of lines 32 to 34 in line 21 there is a shuttle valve 35 to 37. The purpose of these valves is to signal the highest pressure prevailing at a consumer in line 21 and thus to the right end face of pressure compensator 17 .
  • a control spring 39 also acts on this side of the pressure compensator.
  • the pressure compensator 17 has the purpose of switching the pumps 10 and 11 as required. If no consumer is connected (as shown), the pressure compensator 17 is in its switching position I, since there is no pressure in line 21, but there is in line 19, namely a pressure that is higher than the force of the control spring 39 The pressure medium delivered by both pumps now flows via line 23 to the container 24.
  • the Lei builds up device 34 corresponding to the control pressure drop on the orifice 28A, a pressure which is transmitted via the check valve 37 in line 21. If this pressure drop has reached a tuned value, which means that the pressure in line 21 rises and the consumer needs more pressure medium, then the pressure compensator is adjusted in the direction of its switching position II in accordance with this pressure and the force of control spring 39. The pump 11 still feeds into the return line. If the power consumption is just as large as it corresponds to the flow of pump 10, the pressure compensator has assumed the middle position II, ie the pump 11 is still pumping into the return line.
  • a flow limiting valve 40 can be inserted into the supply line from line 12, for example to directional control valve 27, which limits the maximum flow to the consumer.
  • the same parts as in the previous exemplary embodiment are again identified by the same numbers.
  • This embodiment differs from the previous one mainly in that it is an open center system, i. H. the directional control valves - they are now labeled 50 to 52 - have a continuous connection 54 to the return line 24 in the center position shown.
  • the line 21 is omitted in this exemplary embodiment, since the special feature here is the control valve 50 which, in addition to the open center position I, also has an intermediate position II which has a transition function from open center to load sensing technology, i. H. if a consumer is connected to the directional control valve 50, the load pressure is brought here to the pressure compensator 17 via a line 55.
  • This line thus corresponds to line 21 of the previous exemplary embodiment.
  • the pump 10 is used here both for supplying the main consumer and for the small power requirement of the secondary consumers on the directional control valves 51, 52.As in the previous exemplary embodiment, the pump 11 is used again by corresponding actuation of the pressure compensator 17 to cover the peak demand of the main consumer, who is on Directional control valve 50 is connected.
  • a special feature is that two adjustable throttles 56, 57 are arranged in the delivery line 12.
  • the throttle 57 has the effect that the lines 54 and 24 are in neutral circulation through the directional valve block flowing current, a pressure drop occurs which, after exceeding a ⁇ p threshold, opens the pressure compensator and the residual flow of the two pumps flows through it.
  • the throttle 57 determines the maximum current flowing to the directional control valve 52 when it is actuated. It is therefore also possible to transfer the full total flow to a secondary consumer, e.g. B. 52 to bring. Due to the special linkage of the pump line with the neutral circulation line 54, this large flow auxiliary consumer can be arranged as far back as desired in the directional valve block.
  • the maximum current flowing to the directional control valve 51 can be adjusted.
  • the maximum flow limitation to the directional control valves 51 and 52 it is achieved that, with an oil flow limitation value that is equal to or less than that of the pump 10, only actuation of these directional control valves also promotes the pump 10 against pressure while the pump 11 is operating at neutral circulation pressure.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP87101602A 1986-03-14 1987-02-06 Système hydraulique Expired - Lifetime EP0236750B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3608469 1986-03-14
DE19863608469 DE3608469A1 (de) 1986-03-14 1986-03-14 Hydraulikanlage

Publications (3)

Publication Number Publication Date
EP0236750A2 true EP0236750A2 (fr) 1987-09-16
EP0236750A3 EP0236750A3 (en) 1989-09-06
EP0236750B1 EP0236750B1 (fr) 1992-05-06

Family

ID=6296298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101602A Expired - Lifetime EP0236750B1 (fr) 1986-03-14 1987-02-06 Système hydraulique

Country Status (2)

Country Link
EP (1) EP0236750B1 (fr)
DE (2) DE3608469A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2279061A (en) * 1993-05-25 1994-12-21 Linde Ag Hydraulic lifting arrangement
EP0795457A1 (fr) * 1996-03-11 1997-09-17 New Holland U.K. Limited Circuit hydraulique à débit élevé pour tracteurs
EP0719948A3 (fr) * 1994-12-28 1998-08-05 Samsung Heavy Industries Co., Ltd Dispositif de la marche en ligne droite pour engins de construction lourds
GB2390875A (en) * 2002-07-17 2004-01-21 Bamford Excavators Ltd Fluid management system
EP1355067A3 (fr) * 2002-04-20 2005-08-17 Agco SA Système hydraulique de détection de charge
FR2903741A1 (fr) * 2006-07-11 2008-01-18 Jtekt Hpi Soc Par Actions Simp Dispositif d'assistance hydraulique commun
WO2011044870A1 (fr) * 2009-10-12 2011-04-21 Ixetic Bad Homburg Gmbh Système de pompe hydraulique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823892C2 (de) * 1988-07-14 2001-07-26 Bosch Gmbh Robert Hydraulikanlage mit zwei Pumpen
DE3844399C2 (de) * 1988-12-30 1997-08-07 Rexroth Mannesmann Gmbh Steueranordnung für mehrere unabhängig voneinander betätigbare hydraulische Verbraucher und deren Verwendung
DE4018972A1 (de) * 1990-06-13 1991-12-19 Rexroth Mannesmann Gmbh Pumpenanordnung zur versorgung mehrerer hydraulischer verbraucher
DE4105030C2 (de) * 1991-02-19 1994-11-24 Daimler Benz Ag Zahnradpumpe zur Förderung von Schmieröl in einer Brennkraftmaschine
DE102012011400A1 (de) * 2012-06-08 2013-12-12 Hydac System Gmbh Hydrauliksystem zur sicheren Druckversorgung mindestens eines Verbrauchers

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Publication number Priority date Publication date Assignee Title
US3834163A (en) * 1972-11-29 1974-09-10 Koehring Co Control valve for hydraulically operated implements
US4383412A (en) * 1979-10-17 1983-05-17 Cross Manufacturing, Inc. Multiple pump load sensing system
DE3320879A1 (de) * 1983-06-09 1984-12-13 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische steuereinrichtung
US4559965A (en) * 1984-01-09 1985-12-24 J. I. Case Company Multiple compensating unloading valve circuit
EP0190431B1 (fr) * 1985-02-02 1989-03-08 Robert Bosch Gmbh Système hydraulique

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US3868821A (en) * 1974-03-20 1975-03-04 Tyrone Hydraulics Automatic pump control system
DE2435602C3 (de) * 1974-07-24 1980-06-12 International Harvester Company Mbh, 4040 Neuss Selbsttätige Steuereinrichtung zur Verteilung des Druckmittels auf zwei Hydrauliksysteme
DE2614179C2 (de) * 1976-04-02 1984-10-25 Robert Bosch Gmbh, 7000 Stuttgart Wegeventil
CA1104033A (fr) * 1977-02-24 1981-06-30 Commercial Shearing, Inc. Dispositif de commande a compensation de pression et de debit, a couple constant et element de detection de viscosite
GB1566385A (en) * 1977-07-11 1980-04-30 Caterpillar Tractor Co Dual pump flow combining system
DE2808196A1 (de) * 1978-02-25 1979-09-06 Bosch Gmbh Robert Hydraulische steuereinrichtung
DE3030175A1 (de) * 1979-08-30 1981-03-12 Åkermans Verkstad AB, Eslöv Hydraulischer kreis
DE3034377A1 (de) * 1980-09-12 1982-04-22 Krauss-Maffei AG, 8000 München Stromregelventil
DE3145720A1 (de) * 1981-11-19 1983-05-26 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische steuereinrichtung zur hubwerksregelung
DE3420990C2 (de) * 1984-06-06 1994-10-27 Bosch Gmbh Robert Hydraulikanlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834163A (en) * 1972-11-29 1974-09-10 Koehring Co Control valve for hydraulically operated implements
US4383412A (en) * 1979-10-17 1983-05-17 Cross Manufacturing, Inc. Multiple pump load sensing system
DE3320879A1 (de) * 1983-06-09 1984-12-13 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische steuereinrichtung
US4559965A (en) * 1984-01-09 1985-12-24 J. I. Case Company Multiple compensating unloading valve circuit
EP0190431B1 (fr) * 1985-02-02 1989-03-08 Robert Bosch Gmbh Système hydraulique

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2279061A (en) * 1993-05-25 1994-12-21 Linde Ag Hydraulic lifting arrangement
EP0719948A3 (fr) * 1994-12-28 1998-08-05 Samsung Heavy Industries Co., Ltd Dispositif de la marche en ligne droite pour engins de construction lourds
EP0795457A1 (fr) * 1996-03-11 1997-09-17 New Holland U.K. Limited Circuit hydraulique à débit élevé pour tracteurs
EP1355067A3 (fr) * 2002-04-20 2005-08-17 Agco SA Système hydraulique de détection de charge
GB2390875A (en) * 2002-07-17 2004-01-21 Bamford Excavators Ltd Fluid management system
FR2903741A1 (fr) * 2006-07-11 2008-01-18 Jtekt Hpi Soc Par Actions Simp Dispositif d'assistance hydraulique commun
WO2011044870A1 (fr) * 2009-10-12 2011-04-21 Ixetic Bad Homburg Gmbh Système de pompe hydraulique

Also Published As

Publication number Publication date
EP0236750B1 (fr) 1992-05-06
DE3778738D1 (de) 1992-06-11
EP0236750A3 (en) 1989-09-06
DE3608469A1 (de) 1987-10-01

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