PROBLEM TO BE SOLVED: To suppress enlargement by eliminating even a deflector.SOLUTION: A ball screw mechanism comprises a rack shaft which is formed with a spiral rack screw groove at an external peripheral face, a cylindrical nut 30 which is formed with a spiral nut groove 32 which opposes the rack screw groove at an internal peripheral face, and a plurality of balls arranged in a rolling route which is composed of a space surrounded by the rack screw groove and the nut groove 32. Then, at the nut 30, there are formed displacement parts 34 which are arranged at both ends of the nut groove 32, and displace a track of the nut groove 32 from the rack screw groove, and whose grooves are deeply displaced accompanied by the displacement, a reflux route 33 for connecting the respectively displacement parts 34, and a passage port 35 to the reflux route 33.

    【課題】デフレクタを不要にしても大型化を抑えること。【解決手段】ボールねじ機構は、外周面に螺旋状のラックねじ溝が形成されたラック軸と、内周面にラックねじ溝に対向する螺旋状のナット溝32が形成された円筒状のナット30と、ラックねじ溝とナット溝32とにより囲まれる空間からなる転動路に配置される複数のボールとを備えるようにした。そして、ナット30には、ナット溝32の両端に設けられナット溝32の軌道をラックねじ溝からずらすとともに、ずれに伴い溝が深く変位するずれ部34と、各ずれ部34を繋ぐ還流路33と、該還流路33への通路口35とが形成されるようにした。【選択図】図3


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    Title :

    BALL SCREW MECHANISM AND STEERING DEVICE


    Additional title:

    ボールねじ機構及びステアリング装置


    Contributors:

    Publication date :

    2015-12-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

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



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