Pumps – Diverse pumps – Including rotary nonexpansible chamber type
Patent
1990-02-20
1991-09-24
Smith, Leonard E.
Pumps
Diverse pumps
Including rotary nonexpansible chamber type
417 80, 417205, 417252, 418269, F04B 2314
Patent
active
050510657
ABSTRACT:
A rotary hydraulic vane pump includes a rotor mounted within a housing, with a plurality of vanes individually slidably disposed in corresponding slots in the rotor periphery. A cam ring surrounds the rotor within the housing and has a radially inwardly facing vane track defining as least one arcuate fuel pressure cavity between the rotor and the cam ring. A fuel inlet in the housing includes a primary inlet port opening into the cavity at the leading circumferential edge of the cavity with respect to the direction of rotation of the rotor within the housing. A pump outlet includes an outlet port that opens into the cavity adjacent to the trailing circumferential edge of the cavity. A secondary inlet port opens into the cavity circumferentially between the primary inlet port and the outlet port, and is directly connected to the pump outlet port such that fluid, at outlet pressure is available at the secondary inlet port. A pressurization valve, having a predetermined threshold pressure for permitting flow of fluid therethrough, is connected between the pump outlet and the primary pump inlet port.
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patent: 4700680 (1987-10-01), Pearce
Kocharov Michael
Smith Leonard E.
Vickers Incorporated
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