GB1271415A - Improvements in hydrostatic drives - Google Patents

Improvements in hydrostatic drives

Info

Publication number
GB1271415A
GB1271415A GB4025669A GB4025669A GB1271415A GB 1271415 A GB1271415 A GB 1271415A GB 4025669 A GB4025669 A GB 4025669A GB 4025669 A GB4025669 A GB 4025669A GB 1271415 A GB1271415 A GB 1271415A
Authority
GB
United Kingdom
Prior art keywords
pump
line
brake
valve
throttle
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
GB4025669A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1271415A publication Critical patent/GB1271415A/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
    • F16H61/4157—Control of braking, e.g. preventing pump over-speeding when motor acts as a pump
    • 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
    • F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

Abstract

1,271,415. Hydrostatic transmission. ROBERT BOSCH G.m.b.H. 12 Aug., 1969 [13 Aug., 1968], No. 40256/69. Heading F2D. An hydrostatic transmission for a fork-lift truck comprises an adjustable pump 2 connected to a motor 3 driving a wheel 4, the pump being adjusted by a servomotor 6 to which control fluid is delivered by an engine-driven auxiliary pump 15 through a line 14 and a reversing valve 33, the line 14 being also connected by lines 16 and 24 to multiposition throttle valves 18, 26 positioned by a brake pedal 19 and a throttle pedal 27 respectively, to control the servo 6 and hence pump 2. As shown, with the brake and throttle pedals released, valve 18 is closed and valve 26 is fully open to relieve line 14 and allow springs 9 and 10 in servo 6 to hold the pump in neutral. On depressing the throttle pedal 27, valve 26 begins to close to allow line pressure 14 to rise and the pump displacement to be increased. On depressing brake pedal 19 to brake the truck through linkage 21, line 14 is relieved and the truck stops. The throttle pedal is still depressed to allow full engine-power to be used to raise the forks, partial brake release allowing inching drive of the truck. Again, Fig. 2, (not shown), the brake valve 18 is replaced by a spool valve acted on at one end by pressure in the main pump/motor line, and at the other end by the brake pedal 19 which is also acted on by opposing springs.
GB4025669A 1968-08-13 1969-08-12 Improvements in hydrostatic drives Expired GB1271415A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681780223 DE1780223A1 (en) 1968-08-13 1968-08-13 Hydrostatic drive

Publications (1)

Publication Number Publication Date
GB1271415A true GB1271415A (en) 1972-04-19

Family

ID=5704284

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4025669A Expired GB1271415A (en) 1968-08-13 1969-08-12 Improvements in hydrostatic drives

Country Status (3)

Country Link
DE (1) DE1780223A1 (en)
FR (1) FR2015562A1 (en)
GB (1) GB1271415A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2251536C3 (en) * 1972-10-20 1984-09-20 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Control and regulating device for a continuously adjustable hydrostatic transmission for vehicles, especially for forklifts, shovel loaders or the like.
DE2357283A1 (en) * 1973-11-16 1975-05-28 Kloeckner Humboldt Deutz Ag CONTROL DEVICE FOR A DRIVE UNIT FORMED FROM A COMBUSTION ENGINE AND A HYDROSTATIC TRANSMISSION
US4530416A (en) * 1983-05-23 1985-07-23 Fmc Corporation Hydrostatic propulsion system and method with inching throttle and brake

Also Published As

Publication number Publication date
FR2015562A1 (en) 1970-04-30
DE1780223A1 (en) 1972-01-05

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