Hydraulic power steering apparatus

Details Hydraulic power steering apparatus Hydraulic power steering apparatus

2006-06-12

2008-09-30

Winner, Tony H. (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

Reexamination Certificate

active

07428945

ABSTRACT:
A hydraulic power steering apparatus is provided with a check valve regulating a back flow of a working fluid from a power cylinder mechanism to a hydraulic pump side. A valve element slidably accommodated within a valve body of the check valve has three guide portions protruding to an outer side in a diametrical direction. A valve internal oil path in which the working fluid circulates by a pair of guide portions adjacent in a peripheral direction is formed in the valve element. The guide portion is constituted by a slidable contact portion having a sidable contact surface surface contacted with an inner peripheral surface of the valve body, and a coupling portion coupling a base body portion and the sidable contact portion. A width (W1) in a peripheral direction of the sidable contact surface is larger than a width in the peripheral direction of the coupling portion.

REFERENCES:
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patent: 6478549 (2002-11-01), Aden et al.
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patent: 2005/0161278 (2005-07-01), Harnischfeger et al.
patent: 2006/0070792 (2006-04-01), Soeda
patent: 2006/0175122 (2006-08-01), Okabe
patent: 2003-165454 (2003-06-01), None

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