Electric pump unit and electric oil pump apparatus

Details Electric pump unit and electric oil pump apparatus Electric pump unit and electric oil pump apparatus

2008-02-28

2011-10-18

Freay, Charles (Department: 3746)

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

C137S538000, C137S540000

Reexamination Certificate

active

08038417

ABSTRACT:
In an electric pump unit, communication between arcuate ports provided in correspondence with a discharge side and a suction side of an internal gear pump is selectively permitted and prohibited in correspondence with movement of a spool of a relief valve. If fluid pressure at the discharge side of the internal gear pump becomes greater than or equal to a predetermined value, the spool moves across an inner arc of one of the arcuate ports corresponding to the suction side of the internal gear pump and from a position at which the spool prohibits the communication between the arcuate ports to a position at which the spool permits the communication. As the spool moves away from the position at which the spool blocks the communication between the arcuate ports, the opening degree of the relief valve changes in accordance with a downward convex curve.

REFERENCES:
patent: 2883934 (1959-04-01), Roosa
patent: 3574489 (1971-04-01), Pierrat
patent: 5505275 (1996-04-01), Phillips
patent: 6481458 (2002-11-01), Hirano et al.
patent: 6709245 (2004-03-01), Bachmann
patent: 1 705 378 (2006-09-01), None
patent: 11-13641 (1999-01-01), None
patent: 2005-98507 (2005-04-01), None
patent: 2006-188968 (2006-07-01), None
patent: WO 98/26181 (1998-06-01), None

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