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GB1474421A - Variable pressure hydraulic system - Google Patents

Variable pressure hydraulic system

Info

Publication number
GB1474421A
GB1474421A GB3276074A GB3276074A GB1474421A GB 1474421 A GB1474421 A GB 1474421A GB 3276074 A GB3276074 A GB 3276074A GB 3276074 A GB3276074 A GB 3276074A GB 1474421 A GB1474421 A GB 1474421A
Authority
GB
United Kingdom
Prior art keywords
valve
pressure
pump
line
piston
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
GB3276074A
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of GB1474421A publication Critical patent/GB1474421A/en
Expired 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
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • F15B11/055—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive by adjusting the pump output or bypass
    • 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
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load 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
    • F15B2211/30—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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/325—Directional control characterised by the type of actuation mechanically actuated by an output member of the circuit
    • 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
    • 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
    • F15B2211/67—Methods for controlling pilot 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
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S60/00—Power plants
    • Y10S60/911—Fluid motor system incorporating electrical system

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Fluid Gearings (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

1474421 Hydraulic control circuits DEERE & CO 24 July 1974 [25 July 1973] 32760/74 Heading F1P In the circuit shown in Fig. 1, the output of a pump 10 is controlled by a pressure responsive valve 38, which decreases pump output as the pressure rises by feeding pressure fluid to a control chamber of the pump, and is acted on in the sense tending to open the valve by pump pressure and in the sense tending to close it by pressure in a pilot line 56 which is normally coupled by a valve 58 to a line 24, the valve 58 being arranged to close when pressure in the line 24 reaches a predetermined level. A spring 48 determines the stand-by pressure of the pump and when the valve 14 is opened pressure fluid passes through the line 56 and valve 58 to push a piston 52 to the left, thus closing the valve 38. The pump pressure therefore rises. If the valve 14 is closed before excess pressure closes the valve 58 pressure in line 56 is exhausted through a restriction 90. If the valve 14 remains open and the pressure continues to increase, a piston 82 is moved to the right to close a pressure responsive switch 68. This closes the solenoid valve 58 which allows the valve 38 to open and decrease the pump output. Fig. 2 (not shown), illustrates a modified circuit in which a pressure responsive valve 138 controls the pump output by means of a piston and cylinder arrangement 194, 192. The restrictor 90 is omitted and the connection between the ram 112 and the solenoid valve 158 is different.
GB3276074A 1973-07-25 1974-07-24 Variable pressure hydraulic system Expired GB1474421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00382516A US3826090A (en) 1973-07-25 1973-07-25 Variable pressure hydraulic system

Publications (1)

Publication Number Publication Date
GB1474421A true GB1474421A (en) 1977-05-25

Family

ID=23509303

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3276074A Expired GB1474421A (en) 1973-07-25 1974-07-24 Variable pressure hydraulic system

Country Status (11)

Country Link
US (1) US3826090A (en)
AR (1) AR203758A1 (en)
AT (1) AT334217B (en)
AU (1) AU469509B2 (en)
CA (1) CA987201A (en)
DE (1) DE2434840A1 (en)
ES (1) ES428612A1 (en)
FR (1) FR2238852B1 (en)
GB (1) GB1474421A (en)
IT (1) IT1016981B (en)
SE (1) SE412446B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136055A (en) * 1983-02-25 1984-09-12 Same Spa Hydraulic Feed Circuits for Actuators

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006662A (en) * 1972-11-22 1977-02-08 Danfoss A/S Hydraulic Steering apparatus
US3945175A (en) * 1973-10-02 1976-03-23 International Harvester Company Variable speed feed roll drive mechanism for forage harvesters
US3875746A (en) * 1974-04-18 1975-04-08 Amf Inc Electrical control for hydraulic waste compactor
DE2531492C2 (en) * 1975-07-15 1982-09-16 Robert Bosch Gmbh, 7000 Stuttgart Adjustable hydrostatic pump
US3990237A (en) * 1975-12-29 1976-11-09 Deere & Company Deman compensated hydraulic system with pressure amplifier
US4004418A (en) * 1975-12-29 1977-01-25 Deere & Company Demand compensated hydraulic system with flow sensitive device
US3973399A (en) * 1975-12-29 1976-08-10 Deere & Company Demand compensated hydraulic system with pilot line dither
US3995425A (en) * 1976-03-08 1976-12-07 Deere & Company Demand compensated hydraulic system with pilot line pressure-maintaining valve
DE2811585C2 (en) * 1978-03-17 1987-11-12 Mannesmann Rexroth GmbH, 8770 Lohr Hydraulic adjusting device with return device
US4215543A (en) * 1979-04-09 1980-08-05 C. A. Lawton Company Method and apparatus for linear and nonlinear control of a hydraulic press
DE3109045A1 (en) * 1981-03-10 1982-09-16 Alfred Teves Gmbh, 6000 Frankfurt ADJUSTABLE HYDRAULIC PUMP
AU552866B2 (en) * 1981-05-18 1986-06-26 Deere & Company Power-on-demand hydraulic system
AU1928283A (en) * 1982-11-26 1984-05-31 Vickers Incorporated Power transmission
SE459686B (en) * 1986-10-13 1989-07-24 Akermans Verkstad Ab PROCEDURE AND DEVICE FOR CHANGING THE MAXIMUM EASY ACCESSIBLE HYDRAULAR PRESSURE OF THE PUMP SYSTEM IN AN EXCAVATOR
US4813235A (en) * 1987-06-09 1989-03-21 Deere & Company Hydraulic gain reduction circuit
DE3910895A1 (en) * 1987-10-05 1990-10-11 Rexroth Mannesmann Gmbh Control arrangement independent of load for hydraulic consumers
DE3733677A1 (en) * 1987-10-05 1989-04-13 Rexroth Mannesmann Gmbh LOAD-INDEPENDENT CONTROL DEVICE FOR HYDRAULIC CONSUMERS
JP3115887B2 (en) * 1990-09-28 2000-12-11 株式会社小松製作所 Variable circuit of pump displacement in closed center load sensing system
WO2011143301A1 (en) 2010-05-11 2011-11-17 Parker-Hannifin Corporation Pressure compensated hydraulic system having differential pressure control
CN104533861B (en) * 2014-12-05 2016-08-24 中国航空工业集团公司金城南京机电液压工程研究中心 A kind of switching valve for static test

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238060A (en) * 1938-02-08 1941-04-15 Manly Corp Fluid pressure feed and rapid traverse system of transmission of power
US3002462A (en) * 1957-08-13 1961-10-03 Racine Hydraulics & Machinery Fluid translating apparatus
US2892311A (en) * 1958-01-08 1959-06-30 Deere & Co Hydraulic apparatus
US2892312A (en) * 1958-01-27 1959-06-30 Deere & Co Demand compensated hydraulic system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136055A (en) * 1983-02-25 1984-09-12 Same Spa Hydraulic Feed Circuits for Actuators

Also Published As

Publication number Publication date
AT334217B (en) 1976-01-10
FR2238852A1 (en) 1975-02-21
AR203758A1 (en) 1975-10-15
SE412446B (en) 1980-03-03
SE7409586L (en) 1975-02-18
FR2238852B1 (en) 1977-06-24
ES428612A1 (en) 1976-08-16
AU469509B2 (en) 1976-02-12
IT1016981B (en) 1977-06-20
CA987201A (en) 1976-04-13
ATA605474A (en) 1976-04-15
US3826090A (en) 1974-07-30
AU6293273A (en) 1975-05-29
DE2434840A1 (en) 1975-02-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee