Power steering system

Details Power steering system Power steering system

2005-05-03

2005-05-03

Winner, Tony (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

C180S433000, C180S442000, C091S435000

Reexamination Certificate

active

06886657

ABSTRACT:
A power steering system for a vehicle, comprises a steering shaft connected to a steering mechanism. A hydraulic power cylinder is provided for assisting a steering effort of the steering mechanism. A reversible pump is provided having first and second discharge ports which are respectively connected through first and second hydraulic lines with two hydraulic pressure chambers of the hydraulic power cylinder so that the two hydraulic pressure chambers are respectively provided with hydraulic pressures. A driving device is provided for driving the reversible pump to rightly and reversely rotate. A differential pressure regulating valve is disposed in the hydraulic circuit to maintain pressure at least in the first and second hydraulic lines at a level of atmospheric pressure or higher in an inoperative condition of the reversible pump.

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: 2001-1918 (2001-01-01), None

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