Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1978-12-06
1980-07-15
Croyle, Carlton R.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60465, 417217, 417218, F04B 4900
Patent
active
042121647
ABSTRACT:
A variable delivery pump has a pump control mechanism in a housing secured thereto for governing directional flow of fluid through the pump, the pump being adapted to be connected through a closed loop to a motor. A pressure compensating valve is provided in the housing for governing pressure output of the pump, and a pump control cylinder is provided for positioning a flow control cam of the pump in accordance with flow of fluid through the direction control valve and the pressure compensating valve. A cam plate is coaxially connected to a directional control rotatable valve spool of the direction control valve, the cam plate having an outer periphery that is continuously radially variable from a maximum radial point to a minimum radial point for either direction of rotation of the cam from the maximum radial point as the control spool is rotated in either direction from a normal position. The cam plate actuates a cam follower, which in turn actuates a slideable sleeve in the pressure compensating valve. A valve sleeve on the directional control valve is fixed against rotation. There is no feedback connection to the cam plate of the pump to either the direction control valve or the pressure compensating valve.
REFERENCES:
patent: 2896411 (1959-07-01), Bowers et al.
patent: 3127745 (1964-04-01), Young
patent: 3166891 (1965-01-01), Weisenbach
patent: 3669570 (1972-06-01), Himmler
patent: 3946560 (1976-03-01), MacIntosh et al.
Croyle Carlton R.
General Signal Corporation
Look Edward
Mednick Jeffrey S.
Wynn Harold S.
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