Displacement control system for variable displacement pump

Details Displacement control system for variable displacement pump Displacement control system for variable displacement pump

1979-06-26

1981-01-13

Christian, Leonard D.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

F04B 4900

Patent

active

042446783

ABSTRACT:
A displacement control system for a variable displacement pump comprising a charge pump; a first and a second actuators connected in parallel to the variable displacement pump; a cut-off control valve connected to the charge pump, the cut-off control valve including a valve body having a first and a second pump ports, a pressure port and an outlet port formed therein, the first pump port being connected to the charge pump, the second pump port being connected to the variable displacement pump and the pressure port being connected to the first actuator, a sleeve mounted within the valve body, a first and a second pins slidably mounted within the sleeve, a spool slidably mounted within the sleeve, a cylindrical cap member fixedly secured to the valve body defining a spring chamber therein, and a spring disposed within the spring chamber for urging the spool toward connecting the first pump port with the outlet port; and a servo booster connected to the outlet port for controlling the displacement of the variable displacement pump.

REFERENCES:
patent: 3797245 (1974-03-01), Hein
patent: 3830594 (1974-08-01), Hein et al.
patent: 3935706 (1976-02-01), Stevens
patent: 3949649 (1976-04-01), Bosch
patent: 4067664 (1978-01-01), Robeller
patent: 4158529 (1979-06-01), Nonnemacher et al.

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