GB2072308B - Hydrostatic drive having an open hydraulic circuit - Google Patents

Hydrostatic drive having an open hydraulic circuit

Info

Publication number
GB2072308B
GB2072308B GB8105946A GB8105946A GB2072308B GB 2072308 B GB2072308 B GB 2072308B GB 8105946 A GB8105946 A GB 8105946A GB 8105946 A GB8105946 A GB 8105946A GB 2072308 B GB2072308 B GB 2072308B
Authority
GB
United Kingdom
Prior art keywords
motor
throttle means
hydraulic
pressure fluid
feed line
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
GB8105946A
Other versions
GB2072308A (en
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 Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of GB2072308A publication Critical patent/GB2072308A/en
Application granted granted Critical
Publication of GB2072308B publication Critical patent/GB2072308B/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
    • 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
    • F16H61/4148—Open loop circuits
    • 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
    • F16H61/4043—Control of a bypass valve
    • F16H61/4052—Control of a bypass valve by using a variable restriction, e.g. an orifice valve

Abstract

The hydraulic drive comprises a hydraulic pump 4 and a hydraulic motor 1, between which is arranged a 4-3 way valve 2 for controlling the stream of pressure fluid from the pump 4 selectively to flow to and return from the hydraulic motor 1 and for directing the pressure fluid to a reservoir 5 when the motor 1 is idling or stationary. A control valve 3 is arranged between a feed line 41 to the hydraulic motor 1 and a return line 31% therefrom for selectively connecting together or separating such feed line and return line. The control valve 3 has a first variable throttle means 3% between the feed line 41 and the return line 31% and a second variable throttle means 3_ between the first throttle means 3% and the reservoirs. The two throttle means 3' and 3_ are operatively connected together for simultaneous actuation by a common adjusting device 3>. Such arrangement prevents interruption of the flow of pressure fluid to the motor 1, and therefore damage to the motor, when the latter acts as a pump during downhill travel. <IMAGE>
GB8105946A 1980-03-21 1981-02-25 Hydrostatic drive having an open hydraulic circuit Expired GB2072308B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3010913A DE3010913C2 (en) 1980-03-21 1980-03-21 Open circuit hydrostatic transmission

Publications (2)

Publication Number Publication Date
GB2072308A GB2072308A (en) 1981-09-30
GB2072308B true GB2072308B (en) 1984-03-21

Family

ID=6097916

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8105946A Expired GB2072308B (en) 1980-03-21 1981-02-25 Hydrostatic drive having an open hydraulic circuit

Country Status (5)

Country Link
DE (1) DE3010913C2 (en)
FR (1) FR2478769A1 (en)
GB (1) GB2072308B (en)
IT (1) IT1170813B (en)
SE (1) SE449128B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519148A1 (en) * 1985-05-29 1986-12-04 Wessel-Hydraulik GmbH, 2940 Wilhelmshaven Valve arrangement between a main control valve and a hydraulic motor operating in an open circuit
DE3635969A1 (en) * 1986-10-22 1988-04-28 Rexroth Mannesmann Gmbh Valve arrangement for lowering a load acting on a hydraulic cylinder
GB2204652B (en) * 1987-05-09 1991-05-15 Kubota Ltd Fluid pressure control circuit for working vehicle having transmission operable by fluid pressure
GB2482172A (en) 2010-07-22 2012-01-25 Gordon Murray Design Ltd Chassis element for a vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1947385U (en) * 1965-04-12 1966-10-06 Bucher Johann Maschf HYDROSTATIC DRIVE WITH ROTATING HYDROMOTOR.
BE374653A (en) * 1968-02-09 1900-01-01
GB1293931A (en) * 1969-02-18 1972-10-25 Dowty Hydraulic Units Ltd Hydraulic apparatus
FR2129871B1 (en) * 1971-03-17 1975-02-21 Poclain Sa
BE792619A (en) * 1971-12-13 1973-06-12 Caterpillar Tractor Co Fluid motor control circuit having means for counteracting runaway.

Also Published As

Publication number Publication date
DE3010913C2 (en) 1986-05-07
FR2478769A1 (en) 1981-09-25
DE3010913A1 (en) 1981-10-01
IT8148036A0 (en) 1981-03-16
SE8101799L (en) 1981-09-22
FR2478769B1 (en) 1984-01-13
GB2072308A (en) 1981-09-30
IT1170813B (en) 1987-06-03
SE449128B (en) 1987-04-06

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Legal Events

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