Hydraulic power steering apparatus
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United States of America Patent
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-
Dec 5, 2006
Issued Date -
N/A
app pub date -
Sep 10, 2004
filing date -
Sep 24, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A control valve controls hydraulic pressure of oil supplied to a hydraulic actuator for generating steering assist power, based on elastic relative rotation between input and output shafts. A restricting device restricts relative rotation between input and output shafts based on a driving condition of the vehicle, and adjusts the hydraulic pressure for pressing the input shaft via a plunger inserted into a guide bore formed in the output shaft, based on the driving condition of the vehicle by the hydraulic pressure adjustment mechanism. The plunger is guided by the inner circumference of the guide bore along the direction that the plunger approaches to and goes away from the output shaft when the input and output shafts relatively rotate. A friction reducing element is interposed between the inner circumference of the guide bore and the outer circumference of the plunger.
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