Variable displacement pump

Details Variable displacement pump Variable displacement pump

2008-09-03

2010-12-28

Denion, Thomas E (Department: 3748)

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

C418S019000, C418S061300

Reexamination Certificate

active

07857606

ABSTRACT:
A variable displacement pump includes a pump body defining first and second pools for introducing fuel/lubricant oil, and internal and external rotary members rotatably mounted on the pump body and cooperatively defining a space such that, during counterclockwise revolution, the fuel/lubricant oil is taken up from the first pool by sweeping of the space over the first pool, and is delivered to the second pool. A control slider is sleeved on the external rotary member, and has an actuated tooth moved by an expansion force in the second pool to counteract the external rotary member so as to reduce the volume of the space, thereby reducing delivery of the fuel/lubricant oil into the second pool. A biasing member is disposed to bias the actuated tooth towards the second pool.

REFERENCES:
patent: 4413960 (1983-11-01), Specht
patent: 6126420 (2000-10-01), Eisenmann
patent: 7637725 (2009-12-01), Berger

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