GB1326471A - Hydrostatic control systems for continuously-variable power drive units - Google Patents

Hydrostatic control systems for continuously-variable power drive units

Info

Publication number
GB1326471A
GB1326471A GB177571A GB177571A GB1326471A GB 1326471 A GB1326471 A GB 1326471A GB 177571 A GB177571 A GB 177571A GB 177571 A GB177571 A GB 177571A GB 1326471 A GB1326471 A GB 1326471A
Authority
GB
United Kingdom
Prior art keywords
valve
control
valves
hydrostatic transmission
pressure lines
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
GB177571A
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.)
Linde GmbH
Original Assignee
Linde 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
Priority claimed from DE2001701A external-priority patent/DE2001701C3/en
Priority claimed from DE19702017272 external-priority patent/DE2017272A1/en
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of GB1326471A publication Critical patent/GB1326471A/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
    • F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
    • F16H61/433—Pump capacity control by fluid pressure control means
    • 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
    • F16H61/423—Motor capacity control by fluid pressure control means
    • 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
    • F16H61/465—Automatic regulation in accordance with output requirements for achieving a target input speed

Abstract

1326471 Hydrostatic transmission control LINDE AG 14 Jan 1971 [15 Jan 1970 10 April 1970] 1775/71 Heading F2D In a control system for a hydrostatic transmission wherein a follow-up servo motor 9 adjusts the displacement of a pump 1 in response to movement of a pilot valve 14 actuated by pressure liquid supplied through lines 15, 16 from manually controlled valves 17, 22, a bleedoff valve 34 responsive to an operating parameter (e.g. speed or torque) is connected through a shuttle valve 31 to the control pressure lines 15, 16 downstream of restrictors 33. As shown, pumps 1, 41 of identical hydrostatic transmission driving tracks on opposite sides of a vehicle are driven from a common engine and are in closed circuit with the variable displacement motors 4, 44. A manual control 39 selectively actuates control valves 17, 22, 57, 62 which supply pressure liquid frcm an auxiliary pump 6 through control pressure lines 15, 16, 55, 56 to opposite ends of the pilot valves 14, 54 to effect idential or differentical displacements of the pumps 1, 41. The control pressure lines 15, 16, 55, 56 are additionally connected through shuttle valves 23, 63 to pilot valves 25, 65 controlling follow-up servo motors 28, 68 which adjust the displacements of the motors 4, 44. The spring loading of the pilot valves 25, 65 is such that the motor displacement, remain unchanged until the pump displacements are maximum. The control pressure lines 15, 16; 55, 56 are additionally connected through shuttle valves 31, 71 to the bleedoff valve 34 which, as shown, is normally held closed by a centrifugal governor 35 responsive to engine speed. When the engine speed falls below a predetermined value a spring 36 moves the valve 34 left to vent the control pressures and thus reduce the pump displacement. The spring 36 is adjustably loaded by a lever 37 connected to the engine fuel control. The bleedoff valve may be controlled by a governer responsive to output speed to prevent excessively high output speeds. In Fig. 2 (not shown) a hydrostatic transmission for the hoist of a crane has an electromagnetically actuated bleed-off valve (130) controlled by the load on the hoist. The line (126) between the control pressure lines (123, 124) and the bleed-off valve (130) is additionally connected to the actuator (133) of a valve (134) controlling admission of pressure liquid to a brake release cylinder (136) so that when the valve (130) vents the line (126) on overload, the valve (134) automatically applies the brake to the hoist.
GB177571A 1970-01-15 1971-01-14 Hydrostatic control systems for continuously-variable power drive units Expired GB1326471A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001701A DE2001701C3 (en) 1970-01-15 1970-01-15 Setting device for the remote control of a continuously adjustable hydrostatic transmission
DE19702017272 DE2017272A1 (en) 1970-04-10 1970-04-10 Overload protection for a hydrostatically driven crane

Publications (1)

Publication Number Publication Date
GB1326471A true GB1326471A (en) 1973-08-15

Family

ID=25758502

Family Applications (1)

Application Number Title Priority Date Filing Date
GB177571A Expired GB1326471A (en) 1970-01-15 1971-01-14 Hydrostatic control systems for continuously-variable power drive units

Country Status (3)

Country Link
JP (1) JPS5635776B1 (en)
FR (1) FR2075089A5 (en)
GB (1) GB1326471A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546847A (en) * 1975-05-22 1985-10-15 Linde Aktiengesellschaft Hydrostatic-transmission control system, especially for lift and other industrial vehicles
CN116771740A (en) * 2023-08-18 2023-09-19 湖南星邦智能装备股份有限公司 High-position forklift truck, hydraulic control system and method based on single-pump oil supply

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538042B1 (en) * 1982-12-21 1987-12-18 Linde Ag HYDRAULIC ADJUSTMENT SYSTEM FOR A HYDROSTATIC MACHINE
AU2406784A (en) * 1983-02-03 1984-08-09 Continental Emsco Company Emergency control hydraulic system for a crane

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324739A (en) * 1964-07-03 1967-06-13 Citroen Sa Andre Automatic regulation systems of hydrostatic transmissions for automotive vehicles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546847A (en) * 1975-05-22 1985-10-15 Linde Aktiengesellschaft Hydrostatic-transmission control system, especially for lift and other industrial vehicles
CN116771740A (en) * 2023-08-18 2023-09-19 湖南星邦智能装备股份有限公司 High-position forklift truck, hydraulic control system and method based on single-pump oil supply
CN116771740B (en) * 2023-08-18 2023-11-07 湖南星邦智能装备股份有限公司 High-position forklift truck, hydraulic control system and method based on single-pump oil supply

Also Published As

Publication number Publication date
JPS5635776B1 (en) 1981-08-19
FR2075089A5 (en) 1971-10-08

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Legal Events

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