Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2006-08-30
2009-02-10
Dickson, Paul N (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S411000, C180S442000, C180S417000
Reexamination Certificate
active
07487856
ABSTRACT:
An electrically actuated, hydraulic power steering system is provided. The steering system includes a hydraulic pump for generating hydraulic pressure, a hydraulic fluid reservoir, a hydraulic cylinder, and a control valve arrangement that selectively connects the hydraulic cylinder to the pump and the hydraulic fluid reservoir. The control valve arrangement is characterized during the on-center position by a first and a second chamber of the hydraulic cylinder being in fluid communication with each other but not with the fluid reservoir. In one embodiment, the steering system has a steering sensor, a control box, and two pressure accumulators for providing at least two levels of steering assist.
REFERENCES:
patent: 2987293 (1961-06-01), Knudson
patent: 3935917 (1976-02-01), Eley et al.
patent: 4217968 (1980-08-01), Dezelan
patent: 4400938 (1983-08-01), Ohe
patent: 4409789 (1983-10-01), Hansen et al.
patent: 4422290 (1983-12-01), Huffman
patent: 4643227 (1987-02-01), Suzuki
patent: 4739693 (1988-04-01), Honaga et al.
patent: 4809586 (1989-03-01), Gage
patent: 4898078 (1990-02-01), Gage
patent: 4942935 (1990-07-01), Lech
patent: 5279380 (1994-01-01), Frank et al.
patent: 5289894 (1994-03-01), Yoshiyuki
patent: 5307892 (1994-05-01), Phillips
patent: 5372214 (1994-12-01), Haga et al.
patent: 5377717 (1995-01-01), Toogood et al.
patent: 5392690 (1995-02-01), Hundertmark
patent: 5505275 (1996-04-01), Phillips
patent: 5511457 (1996-04-01), Hawkins et al.
patent: 5553683 (1996-09-01), Wenzel
patent: 5558177 (1996-09-01), Inaguma et al.
patent: 5607137 (1997-03-01), Kanda et al.
patent: 5638912 (1997-06-01), Haga et al.
patent: 5682745 (1997-11-01), Phillips
patent: 5749431 (1998-05-01), Peterson
patent: 5862878 (1999-01-01), Bohner
patent: 5921342 (1999-07-01), Maruyama
patent: 6122912 (2000-09-01), Phillips
patent: 6167334 (2000-12-01), Liubakka et al.
patent: 6250416 (2001-06-01), Pluschke et al.
patent: 6298941 (2001-10-01), Spadafora
patent: 6415820 (2002-07-01), Gluf, Jr.
patent: 6488112 (2002-12-01), Kleist
patent: 6539710 (2003-04-01), Draper
patent: 7025044 (2006-04-01), Breeden et al.
patent: 7364006 (2008-04-01), Birsching et al.
patent: 2004/0226769 (2004-11-01), Croughs
patent: 2006/0243518 (2006-11-01), Kobayashi
patent: 2007/0028606 (2007-02-01), Misunou et al.
patent: 2007/0043490 (2007-02-01), Yokotaet al.
patent: 2007/0095598 (2007-05-01), Williams
Edson Joey D.
Foster Randy C
Meckstroth Richard J.
Speer Billy L.
Adams Tashiana
Dickson Paul N
Fluid Routing Solutions, Inc.
Tassone Joseph V.
Thompson Hine LLP
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