Hydraulic unit

Details Hydraulic unit Hydraulic unit

1978-07-17

1980-12-30

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

F04B 4908

Patent

active

042420547

ABSTRACT:
A hydraulic control device to vary the displacement of a hydraulic piston unit, such as pump or motor, in function of the operating pressure, is provided with a pilot-operated servo piston. The pilot system comprises a sensing piston responsive to the operating pressure actuating a pilot piston and a force exerting member acting at an angle to the direction of movement of the sensing piston, the sensing piston and force exerting member acting on a movable bearing. The pilot piston is hydraulically and the movable bearing mechanically, e.g. by a coupling lever, connected to the main piston.

REFERENCES:
patent: Re29333 (1977-08-01), Pensa
patent: 2338021 (1943-12-01), Bennett
patent: 2472104 (1949-06-01), Grant et al.
patent: 2699224 (1955-01-01), Schmitz
patent: 3669570 (1972-06-01), Himmler

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