GB1007887A - Hydrostatic power transmission - Google Patents

Hydrostatic power transmission

Info

Publication number
GB1007887A
GB1007887A GB810861A GB810861A GB1007887A GB 1007887 A GB1007887 A GB 1007887A GB 810861 A GB810861 A GB 810861A GB 810861 A GB810861 A GB 810861A GB 1007887 A GB1007887 A GB 1007887A
Authority
GB
United Kingdom
Prior art keywords
pump
speed
valve
controlled
motor
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
GB810861A
Inventor
Bertram Carl Kempson
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.)
Dowty Hydraulic Units Ltd
Original Assignee
Dowty Hydraulic Units 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 Dowty Hydraulic Units Ltd filed Critical Dowty Hydraulic Units Ltd
Priority to GB810861A priority Critical patent/GB1007887A/en
Publication of GB1007887A publication Critical patent/GB1007887A/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
    • 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
    • F16H61/47—Automatic regulation in accordance with output requirements for achieving a target output speed

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

1,007,887. Hydraulic transmission of power. DOWTY HYDRAULIC UNITS Ltd. Feb. 27, 1962 [March 6, 1961], No. 8108/61. Heading F2D. A hydrostatic transmission comprises a positive displacement pump 2, Fig. 1, connected to a positive displacement motor 5 in which the displacement of the pump and/or motor is controlled by a signal of pump speed so as to maintain the motor speed constant over a range of pump speeds. As shown, the pump is driven from an engine 1 and the displacement of the pump is controlled by a servomotor 37 whose cylinder is movable axially by a manual control lever 43 to determine the control setting. The engine also drives a gear pump 6 which feeds a speed signal device 7 providing a pressure differential, responsive to speed, which is fed by lines 35, 36 to the opposite sides of the spring- loaded servo piston 39. The outlet of the device 7 is preferably fed to a valve unit 9 which controls make-up fluid for the transmission. The device 7, Fig. 2, comprises a spring-loaded valve member 22 having a through passage 25 formed with a restriction 26. The passage also leads to slots 28 by a transverse passage 27. At low engine speeds the restrictor 26 causes a pressure drop insufficient to move the valve 22. As the speed increases the valve 22 moves to open the slots 28, the degree of opening depending on the speed 5 and thus the pressure differential fed through lines 34, 33 to the servomotor is proportional to the speed. The valve 22 may be by-passed by a manually-controlled valve 31 which, when open, provides a fixed restriction for the flow path. Specification 1,007,888 is referred to.
GB810861A 1961-03-06 1961-03-06 Hydrostatic power transmission Expired GB1007887A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB810861A GB1007887A (en) 1961-03-06 1961-03-06 Hydrostatic power transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB810861A GB1007887A (en) 1961-03-06 1961-03-06 Hydrostatic power transmission

Publications (1)

Publication Number Publication Date
GB1007887A true GB1007887A (en) 1965-10-22

Family

ID=9845920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB810861A Expired GB1007887A (en) 1961-03-06 1961-03-06 Hydrostatic power transmission

Country Status (1)

Country Link
GB (1) GB1007887A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689955A (en) * 1983-06-11 1987-09-01 Case Vibromax Gmbh & Co Kg Vibration roller having a power limiting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689955A (en) * 1983-06-11 1987-09-01 Case Vibromax Gmbh & Co Kg Vibration roller having a power limiting device

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