Variable displacement pump with torque limiting control

Details Variable displacement pump with torque limiting control Variable displacement pump with torque limiting control

1980-01-28

1982-06-01

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60449, F04B 4900

Patent

active

043325319

ABSTRACT:
A variable displacement pump 1 includes a housing 2 having an inlet port 3 and an outlet port 4. The pump 1 is an axial piston pump having a swash plate 5 which is actuated to different angular positions by an actuating member 7. The torque limit of the pump 1 is controlled by a horsepower control valve 19 and a speed responsive control valve 35, which change the torque limit of the pump 1 in response to changes in the position of the actuating member 7 and in response to changes in the speed of the engine 33. In this manner, the torque limit of the pump 1 for any position of the actuating member 7 closely approximates the maximum available output torque of the engine 33.

REFERENCES:
patent: 3902320 (1975-09-01), Marietta
patent: 3935707 (1976-02-01), Murphy et al.
patent: 3941513 (1976-03-01), Malott
patent: 3945764 (1976-03-01), Marietta
patent: 4076459 (1978-02-01), Adams et al.
patent: 4162874 (1979-07-01), Marietta

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