Control device for adjustable fluid pumps or motors

Details Control device for adjustable fluid pumps or motors Control device for adjustable fluid pumps or motors

1979-06-13

1981-06-30

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

F04B 106

Patent

active

042759960

ABSTRACT:
The invention relates to a control unit for an adjustable fluid pump or motor controlled by a servomotor. The control unit is of the type having a slide valve with a neutral blocking position with supply and exhaust positions on opposite sides of the neutral position. The neutral position provides a zero pump feed condition and the improvement resides in a construction wherein the fed amount is absolutely zero. This is accomplished with a secondary valve which has a fixed part and a moveable part which moves with the actuator. The secondary valve has fluid passages which short circuit the supply and exhaust connections of the unit over a small travel range on opposite sides of the neutral position of the actuator.

REFERENCES:
patent: 3738779 (1973-06-01), Hein et al.
patent: 3908377 (1975-09-01), Riedhammer
patent: 4028010 (1977-06-01), Hopkins

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