Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1977-04-28
1978-08-22
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60452, 60484, 417218, F16H 3946, F15B 1306
Patent
active
041079248
ABSTRACT:
A multi-range pressure compensated fluid delivery system gives output flow over at least two pressure ranges. The system comprises a prime mover driven variable displacement pump having an inlet from a source of hydraulic fluid and a delivery outlet. A delivery circuit from the output has at least two work circuits selectively connected thereto. A first of the circuits is operable up to a first pressure and a second of the circuits is operable only up to a second lower pressure. An actuator system controls pump displacement responsive to a pressure applied thereto. A system selectively applies a first signal determined by the first pressure to the actuator system to adjust the operating pressure of the pump. A device reduces the first pressure to the second pressure responsive to connection of the second circuit to the delivery circuit to thereby decrease the maximum compensated pressure setting of the pump.
REFERENCES:
patent: 2333530 (1943-11-01), Ernst
patent: 2443345 (1948-06-01), Ernst
patent: 2462971 (1949-03-01), Huber
patent: 3890783 (1975-06-01), Allen et al.
Caterpillar Tractor Co.
Geoghegan Edgar W.
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