Oil pump pressure control device

Details Oil pump pressure control device Oil pump pressure control device

2007-12-17

2011-10-18

Freay, Charles (Department: 3746)

Pumps

With condition responsive pumped fluid control

Plural pump units with individual or relative control

C417S287000, C418S196000, C137S565150

Reexamination Certificate

active

08038416

ABSTRACT:
A device including a first discharge passage from a first rotor assembly to an engine, a first return passage that returns to an intake side of the first rotor assembly, a second discharge passage from a second rotor assembly to the engine, a second return passage that returns to an intake side of the second rotor assembly, and a pressure control valve whose valve main body is provided between a discharge port from the second rotor assembly and the first discharge passage. The first discharge passage and the second discharge passage are coupled, and a flow passage control is executed in each of: a low revolution range; an intermediate revolution range; and a high revolution range.

REFERENCES:
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patent: 4502845 (1985-03-01), Chana
patent: 5087177 (1992-02-01), Haley et al.
patent: 6361287 (2002-03-01), Hopper
patent: 6978746 (2005-12-01), Kibler
patent: 2005/0098385 (2005-05-01), Ono et al.
patent: 2005/0262824 (2005-12-01), Yates et al.
patent: 1 529 958 (2005-05-01), None
patent: 2002-70756 (2002-03-01), None
patent: 2005-6481 (2005-01-01), None
patent: 2005-140022 (2005-06-01), None
European Search Report dated Aug. 14, 2009.

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