Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1975-06-25
1976-07-27
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60452, 60484, 137596, 13759613, 91412, F16H 3946, F15B 1116
Patent
active
039712168
ABSTRACT:
A load responsive hydraulic system uses a signal supply restrictor, a synthetic signal generator and a unique directional control valve to provide a signal fluid having a pressure magnitude which is at a predetermined value above the load actuating pressure of the system and which is called a synthetic signal pressure. The effective output of the system's pump is controlled by the difference between the pressure of the pump and the pressure magnitude of this synthetic signal pressure. During pressure operation of the system, the directional control valve applies the synthetic signal pressure to the pump control mechanism; and during standby operation, the control valve applies a signal fluid to the pump control mechanism whose pressure magnitude is not increased by the synthetic signal generator.
REFERENCES:
patent: 3488953 (1970-01-01), Haussler
patent: 3526247 (1970-09-01), McMillen
patent: 3631890 (1972-01-01), McMillen
patent: 3693506 (1972-09-01), McMillen
patent: 3742982 (1973-07-01), Miller
patent: 3777773 (1973-12-01), Tolbert
patent: 3815477 (1974-06-01), Ailshie et al.
patent: 3841096 (1974-10-01), Koppen
Geoghegan Edgar W.
The Scott & Fetzer Company
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