Power steering system

Details Power steering system Power steering system

2006-08-08

2006-08-08

Winner, Tony (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

Reexamination Certificate

active

07086494

ABSTRACT:
A power steering system for a vehicle. The system includes a hydraulic power cylinder, first and second hydraulic lines, a bypass passage through which the first and second hydraulic lines are connected with each other, and a flow passage change-over device adapted to close the bypass passage during steering assisting. A supply passage and a return passage are disposed in parallel with each other to form part of each of the first and second hydraulic lines. The flow passage change-over device is disposed in each of the first and second hydraulic lines. A differential pressure regulating valve is disposed in each of the return passages and adapted to allow hydraulic fluid to flow toward the hydraulic pressure source in a condition where pressure on side of the hydraulic power cylinder becomes higher than a set pressure or higher than pressure on side of the hydraulic pressure source.

REFERENCES:
patent: 4002220 (1977-01-01), Wible
patent: 5934406 (1999-08-01), Dvorak et al.
patent: 5950757 (1999-09-01), Saita et al.
patent: 5975232 (1999-11-01), Komatsu et al.
patent: 6041883 (2000-03-01), Yokota et al.
patent: 6568499 (2003-05-01), Nakazawa et al.
patent: 6880668 (2005-04-01), Sakaki et al.
patent: 2001-1918 (2001-01-01), None

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