GB1397391A - Actuator for stroke control in hydraulic machines - Google Patents

Actuator for stroke control in hydraulic machines

Info

Publication number
GB1397391A
GB1397391A GB2940271A GB2940271A GB1397391A GB 1397391 A GB1397391 A GB 1397391A GB 2940271 A GB2940271 A GB 2940271A GB 2940271 A GB2940271 A GB 2940271A GB 1397391 A GB1397391 A GB 1397391A
Authority
GB
United Kingdom
Prior art keywords
piston
pump
displacement
motor
pressure
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
GB2940271A
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
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 filed Critical Lucas Industries Ltd
Priority to GB2940271A priority Critical patent/GB1397391A/en
Priority to IT5103272A priority patent/IT958460B/en
Priority to DE19722230589 priority patent/DE2230589A1/en
Priority to FR7222764A priority patent/FR2143374B1/fr
Publication of GB1397391A publication Critical patent/GB1397391A/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/10—Control of working-fluid admission or discharge peculiar thereto
    • F01B3/103—Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block
    • F01B3/106—Control of working-fluid admission or discharge peculiar thereto for machines with rotary 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
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/10—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H2059/6838—Sensing gearing status of hydrostatic transmissions
    • F16H2059/6861—Sensing gearing status of hydrostatic transmissions the pressures, e.g. high, low or differential pressures

Landscapes

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

Abstract

1397391 Variable-stroke pump and motor control LUCAS INDUSTRIES Ltd 16 June 1972 [23 June 1971] 29402/71 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 extension 36 which is biased by spring 40 into abutment with piston 38 which responds to a control pressure at 42 opposed either by a spring 41 or a second control pressure at 43. In the embodiment shown, the extreme leftward position of piston 38 corresponds to maximum stroke, port 43 is blanked off and piston 38 has plug 46 with a by-pass restrictor 47, and an external control pressure is applied at 42 in the case where the transmission is controlled by varying motor displacement. When the transmission is controlled by varying pump displacement, the pump discharge pressure is applied at 42. In a modification, piston 38 has a blank plug which abuts a stop screw in the end of chamber 37, defining a zero-stroke position, and in this case an external pressure is applied at 42 when the transmission is controlled by varying pump displacement, whereas motor input pressure is applied at 42 when the transmission is controlled by varying motor displacement. In the latter case, the control mode at the motor may be such that the power output (PxQ) remains constant. In a further modification, spring 41 is omitted and piston 38 responds to the pressure drop across a restrictor in the return line and adjusts pump displacement to maintain the motor speed constant. Alternatively, the piston responds to the pressure drop across a restrictor in a make-up line supplied by an auxiliary pump driven by the same prime mover as the main pump, and in this case piston 38 adjusts the motor or pump displacement to maintain the prime mover speed constant.
GB2940271A 1971-06-23 1971-06-23 Actuator for stroke control in hydraulic machines Expired GB1397391A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2940271A GB1397391A (en) 1971-06-23 1971-06-23 Actuator for stroke control in hydraulic machines
IT5103272A IT958460B (en) 1971-06-23 1972-06-21 ACTUATOR TO CHANGE THE STROKE OF ROTARY HYDRAULIC MACHINES
DE19722230589 DE2230589A1 (en) 1971-06-23 1972-06-22 Adjustment device for changing the stroke of hydraulic rotary machines
FR7222764A FR2143374B1 (en) 1971-06-23 1972-06-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2940271A GB1397391A (en) 1971-06-23 1971-06-23 Actuator for stroke control in hydraulic machines

Publications (1)

Publication Number Publication Date
GB1397391A true GB1397391A (en) 1975-06-11

Family

ID=10291020

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2940271A Expired GB1397391A (en) 1971-06-23 1971-06-23 Actuator for stroke control in hydraulic machines

Country Status (4)

Country Link
DE (1) DE2230589A1 (en)
FR (1) FR2143374B1 (en)
GB (1) GB1397391A (en)
IT (1) IT958460B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2427521A1 (en) * 1978-05-30 1979-12-28 Linde Ag CONTROL AND REGULATION DEVICE FOR A HYDRAULIC TRANSMISSION
US4723892A (en) * 1987-03-19 1988-02-09 Cowan Philip L Constant power variable volume pump
CN113027661A (en) * 2021-04-20 2021-06-25 天津大学前沿技术研究院有限公司 Flow-induced vibration hydraulic power generation equipment

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1104033A (en) * 1977-02-24 1981-06-30 Commercial Shearing, Inc. Pressure and flow compensated control system with constant torque and viscosity sensing over-ride
DE2827810C2 (en) * 1978-06-24 1983-03-17 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Automotive control for a hydrostatic drive
NL7907714A (en) * 1979-10-19 1981-04-22 Doornes Transmissie Bv METHOD AND APPARATUS FOR CONTROLLING A VARIABLE TRANSMISSION.
DE3236580A1 (en) * 1982-10-02 1984-04-05 Robert Bosch Gmbh, 7000 Stuttgart CONTROL DEVICE FOR A HYDROSTATIC DRIVE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2427521A1 (en) * 1978-05-30 1979-12-28 Linde Ag CONTROL AND REGULATION DEVICE FOR A HYDRAULIC TRANSMISSION
US4723892A (en) * 1987-03-19 1988-02-09 Cowan Philip L Constant power variable volume pump
CN113027661A (en) * 2021-04-20 2021-06-25 天津大学前沿技术研究院有限公司 Flow-induced vibration hydraulic power generation equipment
CN113027661B (en) * 2021-04-20 2023-02-07 天津大学前沿技术研究院有限公司 Flow-induced vibration hydraulic power generation equipment

Also Published As

Publication number Publication date
IT958460B (en) 1973-10-20
FR2143374A1 (en) 1973-02-02
DE2230589A1 (en) 1972-12-28
FR2143374B1 (en) 1973-07-13

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Legal Events

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