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Power steering apparatus for vehicle

  • US 5,513,720 A
  • Filed: 04/26/1995
  • Issued: 05/07/1996
  • Est. Priority Date: 10/23/1991
  • Status: Expired due to Fees
First Claim
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1. A power steering apparatus for a vehicle comprising:

  • a steering mechanism including an input shaft connected to a steering wheel side and an output shaft connected to steered wheels, rotatably supported coaxially in a housing and elastically connected to be rotatable relative to each other, for steering the steered wheels according to steering operation of said steering wheel;

    valve means for controlling supply of a fluid to a power cylinder exerting an assist force on said output shaft according to relative rotation between said input shaft and said output shaft;

    a pressed portion disposed to be projected to at least one side of said input shaft and said output shaft in a radial direction of the shaft;

    a large-diameter portion disposed at least the other side of said input shaft or said output shaft and having a chamber for rotatably containing said pressed portion;

    first and second hydraulic pressure chambers formed independent of each other between said housing and said large-diameter portion;

    a first plunger slidably engaged with a hole formed in said large-diameter portion and opening to said first hydraulic pressure chamber to contact against said pressed portion, for pressing said pressed portion in one direction by a hydraulic pressure applied to said first hydraulic pressure chamber for applying a rotational force to said input shaft or said output shaft;

    a second plunger slidably engaged with a hole formed in said large-diameter portion and opening to said second hydraulic pressure chamber to contact against said pressed portion, for pressing said pressed portion in one direction by a hydraulic pressure applied to said second hydraulic pressure chamber for applying a rotational force to said input shaft or said output shaft;

    first and second annular oil passages connected individually to said first and second hydraulic pressure chambers; and

    control valves for controlling hydraulic pressures to said first and second hydraulic pressure chambers for driving said first and second plungers through said first and second annular oil passages.

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