Rotary expansible chamber devices – Grooved abutting cylinder-rotating member end surfaces
Patent
1978-05-01
1980-06-10
Croyle, Carlton R.
Rotary expansible chamber devices
Grooved abutting cylinder-rotating member end surfaces
418189, F01C 2100
Patent
active
042070384
ABSTRACT:
A power steering pump having a cam with an internal cam surface defining pumping arcs, a rotor in said cam, pumping elements preferably in the form of slippers carried by the periphery of the rotor in sliding engagement with the pumping arcs, flow control valve means having a movable valve element responsive to both static pressure and velocity pressure of the displaced fluid on the high pressure side of the pump wherein provision is made for decreasing the volume of fluid delivered by the pump at high pressure upon an increase in the speed of the rotor, and means for equalizing the pressure between the volume of fluid between two adjacent pumping elements located at a high pressure outlet port and a corresponding volume of fluid between two other adjacent slippers located at a low pressure inlet port as the pumping elements pass through their respective pump cycles.
REFERENCES:
patent: 2624287 (1953-01-01), Ilyin
patent: 2820416 (1958-01-01), Compton
patent: 3007419 (1961-11-01), Burt
patent: 3614266 (1971-10-01), Ciampa et al.
patent: 3645647 (1971-02-01), Ciampa et al.
patent: 3999466 (1976-12-01), Aschke
Croyle Carlton R.
Ford Motor Company
Harrington Donald J.
Look Edward
Zerschling Keith L.
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