Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1989-04-07
1990-05-15
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
418 15, 417435, F04B 4908
Patent
active
049253727
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.
REFERENCES:
patent: 1738345 (1929-12-01), Barlow
patent: 2885962 (1959-05-01), Campbell
patent: 2924178 (1960-02-01), Hogan
patent: 3632238 (1972-01-01), Searle
Makosy Douglas J.
Smith Leonard E.
Vickers Incorporated
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