Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1976-08-19
1978-05-16
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60450, 60484, 91444, 137118, 13759613, F16H 3946
Patent
active
040891690
ABSTRACT:
A hydraulic system includes a fluid responsive means that controls the effective output of the pump in response to pressurization of signal fluid that is supplied by the pump. The signal fluid is pressurized by flowing through a synthetic signal generator and on into a fluid motor in opposition to the working pressure therein. This signal fluid is directed to the fluid motor by the directional control valve when the directional control valve is in an operating position; and it is directed to a sump by the directional control valve when the directional control valve is in a standby position. The present invention provides pressure actuated means to divert or occlude this signal fluid from the directional control valve except when the directional control valve provides a load sensing flow path which communicates this signal fluid to the fluid motor.
REFERENCES:
patent: 2830767 (1958-04-01), Herbenar
patent: 3447556 (1969-06-01), Howeth
patent: 3456442 (1969-07-01), Brooks
patent: 3878864 (1975-04-01), Schurger
patent: 3971216 (1976-07-01), Miller
Geoghegan Edgar W.
The Scott & Fetzer Company
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