Power assist apparatus for steering system

Details Power assist apparatus for steering system Power assist apparatus for steering system

1997-02-13

2000-03-14

DePumpo, Daniel G.

Motor vehicles

Steering gear

With fluid power assist

180417, 60468, 60494, B62D 508

Patent

active

060359587

ABSTRACT:
A steering power assist apparatus is comprised of a power cylinder whose operation is controlled by the a flow rate control valve, a first control valve and a second control valve. The flow rate control valve is connected to a discharge side of a hydraulic pump and controls the amount of the hydraulic oil to be supplied to the first and second control valves according to a load pressure. The first control valve constituted by choke valves is disposed downstream of the flow rate control valve and controls the amount of the hydraulic oil supplied to the second control valve according to a steering torque. The second control valve constituted by choke valves is disposed downstream of the flow rate control valve and controls the amount of the hydraulic oil to the power cylinder according to a steering torque. The choke valves of the second control valve are fully closed after the choke valves of the first control valve are fully closed.

REFERENCES:
patent: 4860635 (1989-08-01), Uchida et al.
patent: 4884648 (1989-12-01), Uchida et al.
patent: 5092418 (1992-03-01), Suzuki et al.
patent: 5133424 (1992-07-01), Fox et al.
patent: 5515938 (1996-05-01), Haga et al.
patent: 5538095 (1996-07-01), Haga et al.
patent: 5638912 (1997-06-01), Haga et al.
patent: 5845737 (1998-12-01), Suzuki et al.

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