Power steering system

Details Power steering system Power steering system

2005-02-08

2005-02-08

Lerner, Avraham (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

C180S442000, C180S441000, C060S476000

Reexamination Certificate

active

06851507

ABSTRACT:
A power steering system includes: a first drain passage for draining an oil pressure from a first oil passage, a second drain passage for draining the oil pressure from a second oil passage, and a pair of a first and second switch valves. When one of the first oil passage and the second oil passage is so pressurized by an operation of a reversible oil pump as to have an increased internal pressure, the pair of the first switch valve and the second switch valve allow the following: i) closing one of the first drain passage and the second drain passage which one is connected to the oil passage having the thus increased internal pressure, while ii) opening the other of the first drain passage and the second drain passage which other is connected to the oil passage that is so depressurized as to have a decreased internal pressure.

REFERENCES:
patent: 3931711 (1976-01-01), Rau et al.
patent: 5279380 (1994-01-01), Frank et al.
patent: 5600955 (1997-02-01), Sahinkaya
patent: 5758739 (1998-06-01), Voss et al.
patent: 6092012 (2000-07-01), Shimizu
patent: 6152254 (2000-11-01), Phillips
patent: 6260356 (2001-07-01), Baughn et al.
patent: 20030178241 (2003-09-01), Yokota et al.
patent: 59-118569 (1984-07-01), None

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