GB1397084A - Actuators for stroke control in hydraulic machines - Google Patents

Actuators for stroke control in hydraulic machines

Info

Publication number
GB1397084A
GB1397084A GB2766771A GB2766771A GB1397084A GB 1397084 A GB1397084 A GB 1397084A GB 2766771 A GB2766771 A GB 2766771A GB 2766771 A GB2766771 A GB 2766771A GB 1397084 A GB1397084 A GB 1397084A
Authority
GB
United Kingdom
Prior art keywords
plunger
pressure
motor
spool
admitted
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
GB2766771A
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
Joseph Lucas Industries Ltd
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 Lucas Industries Ltd, Joseph Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB2766771A priority Critical patent/GB1397084A/en
Priority to IT5078472A priority patent/IT958285B/en
Priority to FR7221036A priority patent/FR2141827B1/fr
Priority to DE19722228579 priority patent/DE2228579A1/en
Publication of GB1397084A publication Critical patent/GB1397084A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F16H61/472—Automatic regulation in accordance with output requirements for achieving a target output torque
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • 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
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)

Abstract

1397084 Variable displacement pump and motor control JOSEPH LUCAS (INDUSTRIES) Ltd 7 June 1972 [12 June 1971] 27667/71 Heading G3P [Also in Division F2] The displacement of a pump or motor in a hydrostatic transmission is controlled by a piston 14 subjected at its right-hand side to the pump output pressure, as transmitted by selector valve 16, and at its left-hand side to a servo pressure established by spool 20 which can connect the left-hand side to exhaust via 30, 29, 31, 28, 32 or to the right-hand side via 30, 29, 27, the piston tending to follow-up displacement of the spool. A sleeve 34 on the spool coacts with the ends of chamber 35 to limit relative displacement of the spool, and also serves to connect the spool to plunger 36, 38 which is biased against stop 44 by spring 43 acting on a seat 42 engaging abutment 41 on the plunger. The plunger extends with clearance through the seat 42 and is urged rightwards by a control pressure admitted at 46 or 47 to chamber 37, the latter having an optional bleed 50. Bores 39, 40 in the plunger maintain a pressure balance across the seat 42. In the arrangement shown, plunger 36, 38 has an overall length such that when it abuts stop 44 the piston 14 assumes a zero-stroke position. Such an arrangement may be used in allowing control of a pump in a hydrostatic transmission in response to an external control pressure admitted at 46 or 47, or in allowing control of a motor in a transmission in response to motor outlet pressure admitted at 46 or 47. In the latter case, the effective diameter of plunger 36, 38 and the rate of spring 43 may be chosen to maintain the power output (pressure x stroke) of the motor constant. In a modified arrangement, the overall length of plunger 36, 38 is reduced so that when it abuts stop 44 the piston 14 assumes a maximum stroke position. In this case an external control pressure is admitted at 46 or 47 to allow control of a motor in a hydrostatic transmission, or a pump output pressure is admitted at 46 or 47 to allow pump output power to remain constant.
GB2766771A 1971-06-12 1971-06-12 Actuators for stroke control in hydraulic machines Expired GB1397084A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2766771A GB1397084A (en) 1971-06-12 1971-06-12 Actuators for stroke control in hydraulic machines
IT5078472A IT958285B (en) 1971-06-12 1972-06-09 ACTUATOR DEVICE TO ADJUST THE STROKE IN HYDRAULIC MACHINES AND MACHINES THAT INCLUDE IT
FR7221036A FR2141827B1 (en) 1971-06-12 1972-06-12
DE19722228579 DE2228579A1 (en) 1971-06-12 1972-06-12 ACTUATOR FOR CHANGING THE STROKE OF HYDRAULIC REVOLVING MACHINES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2766771A GB1397084A (en) 1971-06-12 1971-06-12 Actuators for stroke control in hydraulic machines

Publications (1)

Publication Number Publication Date
GB1397084A true GB1397084A (en) 1975-06-11

Family

ID=10263311

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2766771A Expired GB1397084A (en) 1971-06-12 1971-06-12 Actuators for stroke control in hydraulic machines

Country Status (4)

Country Link
DE (1) DE2228579A1 (en)
FR (1) FR2141827B1 (en)
GB (1) GB1397084A (en)
IT (1) IT958285B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0821163A1 (en) * 1995-04-12 1998-01-28 Komatsu Ltd. Apparatus for controlling swash-plate pump and motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0821163A1 (en) * 1995-04-12 1998-01-28 Komatsu Ltd. Apparatus for controlling swash-plate pump and motor
EP0821163A4 (en) * 1995-04-12 1998-12-16 Komatsu Mfg Co Ltd Apparatus for controlling swash-plate pump and motor

Also Published As

Publication number Publication date
FR2141827B1 (en) 1977-06-17
DE2228579A1 (en) 1973-01-04
IT958285B (en) 1973-10-20
FR2141827A1 (en) 1973-01-26

Similar Documents

Publication Publication Date Title
US3444689A (en) Differential pressure compensator control
GB1434561A (en) Dual range pressure dependent variable flow fluid delivery system
GB1112618A (en) Adjustable, metered, directional flow control arrangement
GB1077844A (en) Hydraulic power units
GB1220727A (en) Control response valve for hydrostatic transmission
GB1235097A (en) Improvements in power transmissions
GB1524044A (en) Actuators
GB812927A (en) Improvements in or relating to a servo-control for a fluid-pump or motor
GB1020987A (en) Hydrostatic transmision
GB1401839A (en) Fluid power systems
GB1076062A (en) Control device for hydrostatic pumps or motors
GB1508948A (en) Piston pump assembly utilizing load pressure control
GB1397391A (en) Actuator for stroke control in hydraulic machines
GB1362664A (en) Valves for fluids
GB972709A (en) Improvements in or relating to hydraulic power transmission systems
GB1397084A (en) Actuators for stroke control in hydraulic machines
GB1148000A (en) Improvements in or relating to hydraulic pump or motor units
GB1147165A (en) Hydraulic control apparatus
GB1333742A (en) Control systems for hydraulic pumps
GB1088914A (en) Improvements in or relating to a fluid pressure energy translating device
GB1314127A (en) Control of fluid operated pumps
GB1343317A (en) System for regulating an hydraulic pump
GB1180189A (en) Improvements in Fluid-pressure Servo Adjusting Devices
GB1033333A (en) Control of variable displacement pumps
GB925060A (en) Improved servo controlled constant-pressure pump

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee