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

1981-01-20

Christian, Leonard D.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

F04B 4900

Patent

active

042459621

ABSTRACT:
A displacement control system for a variable displacement pump comprising a charge 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 and an outlet port formed therein, the first pump port being connected to the charge pump and the second pump port being connected to the variable displacement pump, a sleeve mounted within the valve body, a pin 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: 3935707 (1976-02-01), Murphy et al.

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