Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1979-08-14
1984-10-16
Cohen, Irwin C.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60443, 60452, 417213, F04B 4908, F16H 3946
Patent
active
044766807
ABSTRACT:
A pressure override control which utilizes pump output flow for destroking of a variable displacement pump to minimize loss of power and generation of heat and which includes modifications to the displacement control valve for the pump and, particularly, the cross connection of displacement-controlling servo motors when the displacement control valve is in a neutral position with blocking of communication of said servo motors to a displacement control pressure and drain whereby the pump cannot be positioned in a maximum displacement position in response to certain system malfunctions in the power override control circuitry.
REFERENCES:
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patent: 3908519 (1975-09-01), Born et al.
patent: 3986358 (1976-10-01), Hoffman
patent: 4055047 (1977-10-01), Hara
patent: 4076459 (1978-02-01), Adams et al.
patent: 4116002 (1978-09-01), Knapp et al.
patent: 4149380 (1979-04-01), Nonnenmacher
Eaton Brochure "Override Control", Form EH 1078, Apr. 21, 1975.
Eaton Brochure "Pressure Compensator Control", Form EH 1083, Jan. 6, 1976.
Hydraulic, Inc. Publication "Rapid Response Torque Control", Jan. 28, 1977.
Norris, A., "Pressure Compensator Override", Publication of National Conference on Fluid Power, 1975.
Sauer Getriebe, "Pressure Compensator Control".
Crull Stanley W.
Pollman Frederic W.
Cohen Irwin C.
Sundstrand Corporation
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