GB1401839A - Fluid power systems - Google Patents

Fluid power systems

Info

Publication number
GB1401839A
GB1401839A GB4880572A GB4880572A GB1401839A GB 1401839 A GB1401839 A GB 1401839A GB 4880572 A GB4880572 A GB 4880572A GB 4880572 A GB4880572 A GB 4880572A GB 1401839 A GB1401839 A GB 1401839A
Authority
GB
United Kingdom
Prior art keywords
piston
pump
pressure
valve
pressure drop
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
GB4880572A
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 GB1401839A publication Critical patent/GB1401839A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery 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
    • 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
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/26—Power 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
    • F15B2211/35—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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a 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
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line

Landscapes

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

Abstract

1401839 Fluid-pressure servosystems PARKER-HANNIFIN CORP 23 Oct 1972 [15 Nov 1971] 48805/72 Heading G3P [Also in Division F1] Variable displacement pump 1 supplies motor 5 via line 12 and a directional control valve 4 having metering slots 37 the pressure drop across which is applied via 42, 40 to a piston 45 controlling the pump swash-plate 19 such that the pressure drop is maintained constant, resulting in motor 5 moving at a constant speed linearly related to the displacement of spool 35. When the pressure drop exceeds the desired level, piston 45 is depressed against spring 46 and via pin 51 can set depression of piston 29 and reduction of pump output. When the pressure drop is below the desired level, piston 45 rises and moves orifices 49 into piston 29, allowing pressure to build up via 50 in chamber 47 to cause follow-up movement of piston 29 and increased pump output. Valve 3 has a spool 54 which is biased by a spring 56 independence on the swash-plate angle and which responds to pressure in 40 to vent the space below piston 45 and reduce pump output when the product of pump output and pressure reaches a selected maximum, thereby limiting the power input to the pump. Valve 7 allows remote controlled destroking of the pump, and valve 6 has a spool 62 which responds to the pressure drop across valve 4 and shifts to uncover by-pass ports 64 when spool 35 is moved to the neutral position.
GB4880572A 1971-11-15 1972-10-23 Fluid power systems Expired GB1401839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19874771A 1971-11-15 1971-11-15

Publications (1)

Publication Number Publication Date
GB1401839A true GB1401839A (en) 1975-07-30

Family

ID=22734647

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4880572A Expired GB1401839A (en) 1971-11-15 1972-10-23 Fluid power systems

Country Status (8)

Country Link
US (1) US3726093A (en)
JP (1) JPS5710301B2 (en)
AU (1) AU466456B2 (en)
CA (1) CA956543A (en)
DE (1) DE2255708A1 (en)
FR (1) FR2160484B1 (en)
GB (1) GB1401839A (en)
SE (1) SE380586B (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809501A (en) * 1973-01-08 1974-05-07 Gen Signal Corp Hydraulic load sensitive system
US3979907A (en) * 1973-09-10 1976-09-14 Parker-Hannifin Corporation Priority control valve
US3902320A (en) * 1974-09-05 1975-09-02 Parker Hannifin Corp Mobile power steering system
US4034564A (en) * 1976-01-23 1977-07-12 Caterpillar Tractor Co. Piston pump assembly having load responsive controls
US4142841A (en) * 1977-08-31 1979-03-06 Parker-Hannifin Corporation Variable displacement pump control
US4162874A (en) * 1977-11-07 1979-07-31 Parker-Hannifin Corporation Horsepower summation control for variable displacement
DE3708492A1 (en) * 1987-03-16 1988-09-29 Rexroth Mannesmann Gmbh Regulating device for a hydraulic system
DE3943357A1 (en) * 1989-12-29 1991-07-04 Rexroth Mannesmann Gmbh CIRCUIT ARRANGEMENT WITH A CONTROL ELECTRONICS FOR THE MAGNETIC COILS OF ACTUATORS OF A HYDRAULIC SYSTEM
US6164924A (en) * 1998-09-01 2000-12-26 Oil-Rite Corporation Piston and drive assembly for use in a pump
ZA200807498B (en) * 2006-02-01 2009-12-30 Petro Hydraulic Lift System Llc Hydraulic oil well pumping apparatus
BRPI0707678B1 (en) * 2006-02-01 2019-11-19 Petro Hydraulic Lift System L L C hydraulic oil well pumping apparatus
WO2009097338A2 (en) * 2008-01-28 2009-08-06 Petro Hydraulic Lift System, L.L.C. Hydraulic oil well pumping apparatus
US8647075B2 (en) * 2009-03-18 2014-02-11 Eaton Corporation Control valve for a variable displacement pump
DE102009034616A1 (en) * 2009-07-27 2011-02-03 Robert Bosch Gmbh Way valve arrangement
US9617837B2 (en) 2013-01-14 2017-04-11 Lufkin Industries, Llc Hydraulic oil well pumping apparatus
EP2891806A1 (en) * 2014-01-03 2015-07-08 Danfoss Power Solutions Aps A hydraulic valve arrangement
JP6338428B2 (en) * 2014-04-11 2018-06-06 Ｋｙｂ株式会社 Valve structure

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US25702A (en) * 1859-10-04 Nathan
US2579134A (en) * 1948-03-31 1951-12-18 Deere Mfg Co Valve control means for fluid pressure systems
US2941365A (en) * 1957-07-23 1960-06-21 Sundstrand Corp Hydraulic transmission
JPS4527170Y1 (en) * 1965-08-06 1970-10-21
US3465519A (en) * 1967-08-18 1969-09-09 Webster Electric Co Inc Hydraulic flow controlling apparatus
US3429123A (en) * 1967-08-29 1969-02-25 Leblond Mach Tool Co R K Speed control system
US3501673A (en) * 1968-04-29 1970-03-17 Stromberg Datagraphix Inc Variable magnification cathode ray tube
US3486334A (en) * 1968-05-16 1969-12-30 Cessna Aircraft Co Hydraulic power transmission control
US3592216A (en) * 1968-09-06 1971-07-13 Borg Warner Flow control valve
US3662783A (en) * 1970-02-02 1972-05-16 Parker Hannifin Corp Spool valve assembly

Also Published As

Publication number Publication date
AU4853972A (en) 1974-05-09
DE2255708A1 (en) 1973-05-24
US3726093A (en) 1973-04-10
FR2160484A1 (en) 1973-06-29
CA956543A (en) 1974-10-22
SE380586B (en) 1975-11-10
FR2160484B1 (en) 1977-08-26
JPS5710301B2 (en) 1982-02-25
JPS4861852A (en) 1973-08-29
AU466456B2 (en) 1975-10-30

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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