Variable displacement pump

Details Variable displacement pump Variable displacement pump

1999-09-03

2000-12-05

Walberg, Teresa

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417559, 418 30, F04B 4900

Patent

active

061557978

ABSTRACT:
In a variable displacement pump, a pump body has an inner surface and is formed with suction and discharge paths communicating with the inner surface. First and second fluid pressure chambers are divisionally formed between the inner surface of the pump body and an outer surface of a cam ring through a seal portion including a swing fulcrum pin. A spring biases the cam ring from the second fluid pressure chamber toward the first fluid pressure chamber. A metering restrictor is provided between the discharge paths. A control valve is connected to the discharge paths formed upstream and downstream, respectively, of the metering restrictor and to the first and second fluid pressure chambers, and is driven by fluid pressures present upstream and downstream of the metering restrictor. The control valve connects each one of the first and second fluid pressure chambers to either one of the discharge paths formed upstream and downstream, respectively, of the metering restrictor, and selectively supplies one of the fluid pressures present upstream and downstream of the metering restrictor to the first and second fluid pressure chambers.

REFERENCES:
patent: 3656869 (1972-04-01), Leonard
patent: 5562432 (1996-10-01), Semba et al.
patent: 5895209 (1999-04-01), Miyazawa
patent: 6042343 (2000-03-01), Semba et al.
patent: 6079955 (2000-06-01), Miyazawa et al.

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