To provide a ball screw device which can make the movement of balls smooth.SOLUTION: A ball screw device comprises a screw shaft, a nut, a plurality of balls and an end deflector. The nut has a second screw groove formed at an internal peripheral face, a notch formed at an end face, and a return hole formed at a bottom face of the notch orthogonal to an axial direction of the screw shaft, and penetrating the notch in the axial direction. The end deflector is fit into the notch. The nut comprises a curved face part at a position between the second screw groove out of a side face of the notch and the return hole. In a first cross section for cutting the nut at a plane orthogonal to the axial direction, and passing the second screw groove and the notch, the curve face part includes a portion drawing a circular arc with a point located outside the second screw groove as center in a radial direction with a rotating axis of the nut as a center. The end deflector comprises at least three plane parts being flat surfaces. The three plane parts mutually form angles.SELECTED DRAWING: Figure 9

    【課題】ボールの動きを滑らかにすることができるボールねじ装置を提供すること。【解決手段】ボールねじ装置は、ねじ軸と、ナットと、複数のボールと、エンドデフレクタと、を備える。ナットは、内周面に設けられる第2ねじ溝、端面に設けられる切欠き、及びねじ軸の軸方向に対して直交する切欠きの底面に設けられ且つ軸方向に貫通する戻し穴を有する。エンドデフレクタは、切欠きに嵌まる。ナットは、切欠きの側面のうち第2ねじ溝と戻し穴との間の位置に曲面部を備える。軸方向に対して直交し且つ第2ねじ溝及び切欠きを通る平面でナットを切った第1断面において、曲面部は、ナットの回転軸を中心とした放射方向で第2ねじ溝よりも外側に位置する点を中心とした円弧を描く部分を含む。エンドデフレクタは、平面状の表面である少なくとも3つの平面部を備える。3つの平面部は、互いに角度をなす。【選択図】図9


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    Title :

    BALL SCREW DEVICE AND ELECTRIC POWER STEERING DEVICE


    Additional title:

    ボールねじ装置及び電動パワーステアリング装置


    Contributors:
    MAN YUSUKE (author) / KANEKO SHOYA (author)

    Publication date :

    2019-12-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B62D MOTOR VEHICLES , Motorfahrzeuge



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