Power steering system

Details Power steering system Power steering system

2005-09-08

2008-10-14

Winner, Tony H. (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

C180S422000

Reexamination Certificate

active

07434655

ABSTRACT:
A power steering system includes first and second communication passages for providing communication between a first oil passage and a second oil passage, a third communication passage for providing communication between the first and second communication passages, a directional control valve disposed in the third communication passage, a first check valve disposed in the first communication passage for allowing flow from the first oil passage to a first connection portion only, a second check valve disposed in the first communication passage for allowing flow from second oil passage to the first connection portion only, a third check valve disposed in the second communication passage for allowing flow from a second connection portion to the first oil passage only, and a fourth check valve disposed in the second communication passage for allowing flow from the second connection portion to the second oil passage only.

REFERENCES:
patent: 6193009 (2001-02-01), Chino et al.
patent: 6523913 (2003-02-01), Lauer et al.
patent: 6568499 (2003-05-01), Nakazawa et al.
patent: 6742537 (2004-06-01), Martus et al.
patent: 6880668 (2005-04-01), Sakaki et al.
patent: 6886657 (2005-05-01), Yokota et al.
patent: 6945510 (2005-09-01), Dralyuk
patent: 6953102 (2005-10-01), Kurata et al.
patent: 7044262 (2006-05-01), Otaki et al.
patent: 7174988 (2007-02-01), Sasaki et al.
patent: 2003-237601 (2003-08-01), None

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