GB1243761A - Three pump hydraulic system for a vehicle - Google Patents

Three pump hydraulic system for a vehicle

Info

Publication number
GB1243761A
GB1243761A GB8870/70A GB887070A GB1243761A GB 1243761 A GB1243761 A GB 1243761A GB 8870/70 A GB8870/70 A GB 8870/70A GB 887070 A GB887070 A GB 887070A GB 1243761 A GB1243761 A GB 1243761A
Authority
GB
United Kingdom
Prior art keywords
valve
pressure
implement circuit
circuit
implement
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
Application number
GB8870/70A
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.)
SPX Corp
Original Assignee
General Signal Corp
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 General Signal Corp filed Critical General Signal Corp
Publication of GB1243761A publication Critical patent/GB1243761A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/40—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
    • F15B2211/45—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/65—Methods of control of the load sensing 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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
    • F15B2211/78—Control of multiple output members
    • F15B2211/781—Control of multiple output members one or more output members having priority

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Power Steering Mechanism (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

1,243,761. Hydraulic systems for vehicles. GENERAL SIGNAL CORP. 24 Feb., 1970 [9 May, 1969], No. 8870/70. Heading B7H. In an hydraulic system for a construction vehicle having a steering circuit 13 and an implement circuit 14 supplied by respective engine-driven gear pumps 15, 17, and a demand valve 23 arranged as described in Specification 1,091,836 to split the output of a third pump 16 between the circuits 13, 14 in such a way as to maintain a constant total flow to the steering circuit 13 over a major part of the speed range of the engine 18, overheating due to excessive oil discharge through an implement circuit relief valve 45 is avoided by providing between the demand valve 23 and the implement circuit 14 an unloader device 27 which diverts oil from the demand valve 23 to a reservoir 19 when pressure in the implement circuit exceeds a predetermined value. The unloader device 27 comprises an unloading valve 31 for opening and closing an exhaust passage 32 to the reservoir 19, a first pressure cylinder 35 urging the valve 31 towards the open position, and a second pressure cylinder 36 urging the valve 31 towards the closed position and subjected to the pressure in a passage 37 which is supplied through a restrictor 38 from a conduit 26 between the demand valve 23 and the implement circuit 14 and leads through a pilot valve 41 to the reservoir 19. When the pressure in the implement circuit 14 exceeds the predetermined value, the pilot valve 41 opens against spring- loading 42 to create a pressure drop across the restrictor 38 so that the cylinder 35 opens the unloading valve 31. A piston 43 subject to implement circuit pressure in the conduit 26 beyond a check valve 33 holds the pilot valve 41 open until the implement circuit pressure decreases. In an alternative arrangement, Fig. 2 (not shown), the unloader device is connected between the pump 17 and the implement circuit.
GB8870/70A 1969-05-09 1970-02-24 Three pump hydraulic system for a vehicle Expired GB1243761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82340169A 1969-05-09 1969-05-09

Publications (1)

Publication Number Publication Date
GB1243761A true GB1243761A (en) 1971-08-25

Family

ID=25238661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8870/70A Expired GB1243761A (en) 1969-05-09 1970-02-24 Three pump hydraulic system for a vehicle

Country Status (6)

Country Link
US (1) US3535877A (en)
JP (1) JPS5025571B1 (en)
DE (1) DE2012752C3 (en)
FR (1) FR2046570A5 (en)
GB (1) GB1243761A (en)
SE (1) SE346834B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108167240A (en) * 2017-12-05 2018-06-15 西安交通大学 A kind of hydraulic system of local loading hydraulic press

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2148331B2 (en) * 1971-08-06 1974-03-29 Poclain Sa
DE1952034A1 (en) * 1969-10-15 1971-04-22 Linde Ag Control device for a hydraulic system and valve for this
US3719249A (en) * 1971-03-05 1973-03-06 Gen Signal Corp Power steering system affording emergency steering capability
US3868821A (en) * 1974-03-20 1975-03-04 Tyrone Hydraulics Automatic pump control system
DE2435602C3 (en) * 1974-07-24 1980-06-12 International Harvester Company Mbh, 4040 Neuss Automatic control device for distributing the pressure medium to two hydraulic systems
US3942413A (en) * 1974-08-01 1976-03-09 Borg-Warner Corporation Load limiting system
US3975909A (en) * 1975-02-26 1976-08-24 Tyrone Hydraulics, Inc. Engine sensor hydraulic control system
US3972185A (en) * 1975-02-28 1976-08-03 Caterpillar Tractor Co. Hydraulic system for a pipelayer
DE2625101C2 (en) * 1976-06-04 1985-11-14 Robert Bosch Gmbh, 7000 Stuttgart Hydraulic control device for the volume flow-dependent distribution of hydraulic fluid between two systems
US4121501A (en) * 1977-07-11 1978-10-24 Caterpillar Tractor Co. Flow combining system for dual pumps
US4141280A (en) * 1977-07-11 1979-02-27 Caterpillar Tractor Co. Dual pump flow combining system
US4204811A (en) * 1977-08-19 1980-05-27 The Garrett Corporation Fluid pumping system
GB2041851B (en) * 1978-12-25 1983-04-13 Komatsu Mfg Co Ltd Hydraulic circuits for off-highway vehicles
JPS5766243A (en) * 1980-10-09 1982-04-22 Komatsu Ltd Liquid pressure circuit for construction machinery
US4517800A (en) * 1980-10-31 1985-05-21 Kabushiki Kaisha Komatsu Seisakusho Hydraulic control system for off-highway self-propelled work machines
US4422290A (en) * 1981-08-26 1983-12-27 General Signal Hydraulic control system for governing steering and implement actuators
DE3210759A1 (en) * 1981-09-17 1983-10-06 Walter Schopf Pump combination with flow control device
JPS58135551U (en) * 1982-03-09 1983-09-12 株式会社クボタ Tractor drive structure
US4819430A (en) * 1983-01-21 1989-04-11 Hydreco, Inc. Variably charged hydraulic circuit
DE3513967A1 (en) * 1985-04-18 1986-10-23 Mannesmann Rexroth GmbH, 8770 Lohr SAFETY ARRANGEMENT FOR PRIORITY HYDRAULIC CONSUMERS
US4649705A (en) * 1985-05-14 1987-03-17 Clark Equipment Company Composite hydraulic system
AU631727B2 (en) * 1990-03-09 1992-12-03 Kubota Corporation Hydraulic circuit for a working vehicle having a plurality of hydraulic actuators
US5513732A (en) * 1994-08-05 1996-05-07 Ford Motor Company Regulation of hydraulic pressure in a system having multiple pressure sources
US5615553A (en) * 1995-06-28 1997-04-01 Case Corporation Hydraulic circuit with load sensing feature
DE102006060351B8 (en) * 2006-12-20 2008-07-24 Sauer-Danfoss Gmbh & Co Ohg Hydraulic circuit with energy recovery
JP5232843B2 (en) * 2010-09-16 2013-07-10 株式会社山田製作所 Variable flow oil pump
CN103016457B (en) * 2012-12-05 2015-08-26 中联重科股份有限公司 Hydraulic pump control system, vehicle and steering hydraulic system thereof
US10107311B2 (en) * 2013-05-30 2018-10-23 Hitachi Construction Machinery Tierra Co., Ltd. Hydraulic drive system for construction machine
DE102014218884B4 (en) * 2014-09-19 2020-12-10 Voith Patent Gmbh Hydraulic drive with rapid lift and load lift
DE102019109773A1 (en) * 2019-04-12 2020-10-15 Wirtgen Gmbh Construction machine and method of controlling a construction machine
US11168711B2 (en) * 2019-10-24 2021-11-09 Deere & Company Hydraulic system for a multi-function machine
CN113565817A (en) * 2021-06-29 2021-10-29 英轩重工有限公司 Unloading valve and loader hydraulic multi-pump confluence system thereof

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US2103530A (en) * 1935-09-05 1937-12-28 Maine Steel Inc System of equalizing the lifting speed of differently loaded hydraulic jacks
US2879612A (en) * 1956-05-02 1959-03-31 Gar Wood Ind Inc Hydraulic drive for ditcher conveyor
US3360925A (en) * 1966-02-03 1968-01-02 Int Harvester Co Multiple speed hydraulic control system
US3410295A (en) * 1966-02-21 1968-11-12 Gen Signal Corp Regulating valve for metering flow to two hydraulic circuits
US3386344A (en) * 1966-09-30 1968-06-04 Caterpillar Tractor Co Self-loading scraper hydraulic circuit with diverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108167240A (en) * 2017-12-05 2018-06-15 西安交通大学 A kind of hydraulic system of local loading hydraulic press

Also Published As

Publication number Publication date
SE346834B (en) 1972-07-17
JPS5025571B1 (en) 1975-08-25
FR2046570A5 (en) 1971-03-05
DE2012752A1 (en) 1970-11-26
US3535877A (en) 1970-10-27
DE2012752B2 (en) 1973-03-29
DE2012752C3 (en) 1973-10-18

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