GB911053A - Dual pump system and control valve assembly therefor - Google Patents

Dual pump system and control valve assembly therefor

Info

Publication number
GB911053A
GB911053A GB13782/61A GB1378261A GB911053A GB 911053 A GB911053 A GB 911053A GB 13782/61 A GB13782/61 A GB 13782/61A GB 1378261 A GB1378261 A GB 1378261A GB 911053 A GB911053 A GB 911053A
Authority
GB
United Kingdom
Prior art keywords
pump
pressure
units
unit
operated
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
GB13782/61A
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.)
Parker Hannifin Corp
Original Assignee
Parker Hannifin 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 Parker Hannifin Corp filed Critical Parker Hannifin Corp
Publication of GB911053A publication Critical patent/GB911053A/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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/425—Drive systems for dipper-arms, backhoes or the like
    • 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
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/085—Ground-engaging fitting for supporting the machines while working, e.g. outriggers, legs
    • 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
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • 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
    • F15B2211/20584—Combinations of pumps with high and low 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
    • F15B2211/30—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
    • F15B2211/31—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
    • F15B2211/70—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

Abstract

911,053. Shovelling machines. PARKERHANNIFIN CORPORATION. April 17, 1961 [April 18, 1960], No. 13782/61. Class 68 (1). [Also in Group XXIX] A fluid power system for a back-hoe on a tractor comprises at least two pressure-operated units 19, 20 which are associated with control valves 28, 38 and operated by fluidpressure delivered by respective pumps 23, 24 so that one unit 20 may be operated by the conjoint discharge of both pumps when the other unit is not in operation, an unloader 80 for the pump 24 associated with the said one unit when the fluid-pressure delivered to that unit exceeds a predetermined value, a first check valve 68 downstream the unloader to maintain such fluid pressure in said one unit when said one pump is unloaded, and a second check valve 63 permitting flow of fluid under pressure from the other pump 23 to said one unit for continued operation of the latter. The tractor may have six units consisting of right and left stabilizers 7, 8, a swing cylinder 19, a boom hoisting and lowering cylinder 20, a crowd arm cylinder 21 and a bucket cylinder 22. The units 7, 8 and 19 may be of small capacity and are controlled by valves 28, 29, 30 which connect the small capacity highpressure pump 23 to lines 31, 32, 33 leading to the units. The units 20, 21, 22 are of large capacity and controlled by valves 38, 39, 40 which connect the large capacity low-pressure pump 24 to lines 41, 42, 43 leading to the units. When any of the units 20, 21, 22 are in operation and the resistance against movement is low, the output from the high-pressure pump acts through a by-pass 61 and check valve 63 to be added to the output of pump 24. As the resistance to movement of the unit increases, the pressure at the inlet 67 from the large capacity pump 24 acts on a portion 81 of the unloader 80 which is moved to connect the output from the pump to a return passage 78 connected by a line 52 to a reservoir 53, the unit then being operated by the high-pressure pump 23 only. Check valves 73, 74 are provided to prevent back-pressure from the units acting on the system. A relief valve 79 limits the maximum pressure from the high-pressure pump 23.
GB13782/61A 1960-04-18 1961-04-17 Dual pump system and control valve assembly therefor Expired GB911053A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23036A US3146593A (en) 1960-04-18 1960-04-18 Dual pump system and control valve assembly therefor

Publications (1)

Publication Number Publication Date
GB911053A true GB911053A (en) 1962-11-21

Family

ID=21812754

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13782/61A Expired GB911053A (en) 1960-04-18 1961-04-17 Dual pump system and control valve assembly therefor

Country Status (2)

Country Link
US (1) US3146593A (en)
GB (1) GB911053A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191275A1 (en) * 1985-02-14 1986-08-20 TRINOVA S.p.A. Anti-saturation system for hydraulic control circuits for working members of earth-moving machines

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1117603A (en) * 1964-09-26 1968-06-19 Dowty Technical Dev Ltd Hydraulic apparatus suitable for raising and lowering a load
US3350986A (en) * 1966-03-17 1967-11-07 Caterpillar Tractor Co Two-pump supply for hydraulic circuits having different flow requirements
DE1634915C3 (en) * 1967-03-10 1981-02-12 O & K Orenstein & Koppel Ag Circuit for hydraulic excavator
US3448576A (en) * 1967-08-17 1969-06-10 Westinghouse Air Brake Co Fluid control system
US3486418A (en) * 1968-05-22 1969-12-30 Caterpillar Tractor Co Control system for dual motors
JPS492724Y1 (en) * 1968-08-12 1974-01-23
DE1952034A1 (en) * 1969-10-15 1971-04-22 Linde Ag Control device for a hydraulic system and valve for this
US3693350A (en) * 1971-01-11 1972-09-26 Commercial Shearing Hydraulic control circuits and apparatus
DE2138986C3 (en) * 1971-08-04 1978-09-07 G.L. Rexroth Gmbh, 8770 Lohr Control valve device for several hydraulic drives
US3754394A (en) * 1971-12-02 1973-08-28 Hyster Co Hydraulic control system for electric lift truck
US3922855A (en) * 1971-12-13 1975-12-02 Caterpillar Tractor Co Hydraulic circuitry for an excavator
US3960284A (en) * 1972-10-02 1976-06-01 American Hoist & Derrick Company Hydraulic backhoe circuitry
US3972185A (en) * 1975-02-28 1976-08-03 Caterpillar Tractor Co. Hydraulic system for a pipelayer
US3955474A (en) * 1975-03-19 1976-05-11 J. I. Case Company Fluid pressure system having pumps and valves
FR2581404B1 (en) * 1985-05-03 1987-07-10 Poncin Gilles ALL TERRAIN EARTHMOVING MACHINE
US6018895A (en) * 1996-03-28 2000-02-01 Clark Equipment Company Valve stack in a mini-excavator directing fluid under pressure from multiple pumps to actuable elements
AU720849B2 (en) * 1996-03-28 2000-06-15 Clark Equipment Company Multifunction valve stack
US6374606B1 (en) 1999-03-19 2002-04-23 Caterpillar S.A.R.L. Dual pump ejector system for articulated trucks and the like having horizontal discharge
ITBO20000473A1 (en) * 2000-07-31 2002-01-31 Hydrocontrol S P A HYDRAULIC DISTRIBUTOR, TO CONTROL THE OPERATION OF A BRUSHCUTTER.
US6612109B2 (en) * 2001-12-20 2003-09-02 Case Corporation Hydraulic power boost system for a work vehicle
FI20030115A (en) * 2003-01-24 2004-07-25 Sandvik Tamrock Oy Hydraulic system for quarrying equipment and method for adjusting rock drill power
JP5758348B2 (en) * 2012-06-15 2015-08-05 住友建機株式会社 Hydraulic circuit for construction machinery
JP6298716B2 (en) * 2014-05-30 2018-03-20 日立建機株式会社 Work machine
JP6643913B2 (en) * 2016-02-16 2020-02-12 株式会社クボタ Hydraulic block

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2247140A (en) * 1937-08-09 1941-06-24 Vickers Inc Multiple valve unit
US2656152A (en) * 1949-01-03 1953-10-20 Jeffrey Mfg Co Truck for drill and mining machines
US2745253A (en) * 1950-04-01 1956-05-15 Electraulic Presses Ltd Combined admission, relief and unloading valve and hydraulic power system
US2643516A (en) * 1951-12-08 1953-06-30 Goodman Mfg Co Fluid pressure system
BE549561A (en) * 1955-10-13 1900-01-01

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191275A1 (en) * 1985-02-14 1986-08-20 TRINOVA S.p.A. Anti-saturation system for hydraulic control circuits for working members of earth-moving machines

Also Published As

Publication number Publication date
US3146593A (en) 1964-09-01

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