Damper valve and hydraulic power steering apparatus using...

Details Damper valve and hydraulic power steering apparatus using... Damper valve and hydraulic power steering apparatus using...

2006-07-25

2006-07-25

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

C137S493000, C188S282100

Reexamination Certificate

active

07080659

ABSTRACT:
A damper valve includes a valve member for covering openings of communicating passages of a valve sleeve. The valve member is elastically deformed by a low flow rate of the hydraulic oil flowing from a second chamber to a first chamber of the valve sleeve and when a flow rate of the hydraulic oil flowing from the second chamber to the first chamber exceeds a predetermined value, the valve member is moved with the spool against urging force of a spring to widely open the openings of the communicating passages.

REFERENCES:
patent: 5868161 (1999-02-01), Asbrand et al.
patent: 6393962 (2002-05-01), Hamano et al.
patent: 6543473 (2003-04-01), Miyazaki
patent: 1 075 998 (2001-02-01), None
patent: 1 184 257 (2004-04-01), None
patent: 2001-158369 (2001-06-01), None
German Office Action dated Dec. 8, 2005 with an English translation.

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