PROBLEM TO BE SOLVED: To provide an electric power steering unit which can inhibit rattle sound that may be generated by a ball screw supporting bearing,as well as inhibit dimension change that may occur due to difference between coefficients of thermal expansion of ball screw supporting bearing and housing, and which can be made of a reduced number of parts.SOLUTION: An electric power steering unit comprises a ball screw mechanism having a ball screw shaft 6, a ball screw nut 4, and balls 7, a housing 2 which stores the ball screw mechanism, a ball screw supporting bearing 8 which is arranged between the housing 2 and the ball screw nut 4, and an electric motor which is arranged in a shaft different from the ball screw shaft 6, and is used for driving of the ball screw nut 4. Elastic portions Q are provided in end portions of a cylindrical portion 11a and an annular portion 11b between the ball screw supporting bearing 8 and the housing 2, and a bearing case 10 is assembled in a state where a preload force is generated in an elastic portion Q2 of the annular portion 11b.SELECTED DRAWING: Figure 2

    【課題】ボールねじ支持軸受から発生するラトル音を抑制すると共に、ボールねじ支持軸受とハウジングの熱膨張率の違いによって生じる寸法変化も抑えることができ、少ない部品点数の電動パワーステアリング装置を提供する。【解決手段】ボールねじ軸6と、ボールねじナット4と、ボール7とからなるボールねじ機構と、当該ボールねじ機構を収納するハウジング2と、ハウジング2とボールねじナット4との間に配されるボールねじ支持軸受8と、ボールねじ軸6と別軸に配置され、ボールねじナット4の駆動に供される電動モータと、からなり、ボールねじ支持軸受8とハウジング2との間には、円筒部11aと環状部11bの端部に弾性部Qが設けられており、環状部11bの弾性部Q2に予圧力を発生させた状態で軸受ケース10が組付けられている。【選択図】図2


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    Title :

    ELECTRIC POWER STEERING UNIT


    Additional title:

    電動パワーステアリング装置


    Contributors:
    SHIBATA KOICHI (author) / MAN YUSUKE (author)

    Publication date :

    2018-11-15


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge / F16C SHAFTS , Wellen / F16H Getriebe , GEARING



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