Power steering apparatus

Details Power steering apparatus Power steering apparatus

1997-07-31

2000-09-19

Schwartz, Christopher P.

Motor vehicles

Steering gear

With fluid power assist

13762521, 13762523, B62D 510

Patent

active

06119803&

ABSTRACT:
In a power steering apparatus having a control valve with a first control valve portion and a second control valve portion to enhance rigidity of a steering operation, an amount of an overlapping portion of an overlap variable orifice is designed larger than an amount of an unlapping portion of an untapped variable orifice in the control valve because of dispersion during manufacture. When the overlap variable orifice finishes overlapping, the unlapped variable orifice has already started unlapping. Therefore, since the overlap variable orifice and the unlapped variable orifice never become unlapping form simultaneously regardless of the dispersion, the control valve is capable of minimizing a difference of the flow between a plurality of the second control valve portion. As a result, the power steering apparatus relative to the invention prevents enlargement of noise caused by an unbalance of the flow between a plurality of the second control valve portions in the control valve.

REFERENCES:
patent: 4848402 (1989-07-01), Elser
patent: 5372214 (1994-12-01), Haga et al.
patent: 5439070 (1995-08-01), Haga et al.
patent: 5471838 (1995-12-01), Suzuki et al.
patent: 5515938 (1996-05-01), Haga et al.
patent: 5638912 (1997-06-01), Haga et al.
patent: 5778756 (1998-07-01), Haga
patent: 5845737 (1998-12-01), Suzuki

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