PROBLEM TO BE SOLVED: To provide a ball screw and a steering device that can smooth a flow of balls.SOLUTION: A ball screw provided in a steering device comprises a screw groove that houses a plurality of balls 16 between an inner peripheral surface of a cylindrical nut 13 through which a steering shaft passes and an outer peripheral surface of the steering shaft. The balls 16 that flow while rolling in the screw groove are returned from the downstream side to the upstream side via deflectors 18 and 19 and a return passage member 20 provided in the nut 13. The return passage member 20 comprises: a first connecting part 22 that curves so as to connect one end of a straight part 21 thereof to the first deflector 18; and a second connecting part 23 that curves so as to connect another end of the straight part 21 to the second deflector 19. The connecting parts 22 and 23 comprise: opening parts that open on longitudinal end surfaces of the return passage member 20; and opening parts that open on an outer periphery of the return passage member 20 toward a center line of the nut 13.SELECTED DRAWING: Figure 3

    【課題】ボールの流れを円滑にすることができるボールねじ及びステアリング装置を提供する。【解決手段】ステアリング装置に設けられたボールねじは、転舵シャフトが貫通する円筒状のナット13の内周面と転舵シャフトの外周面との間に、複数のボール16を収容したねじ溝を有している。そして、ねじ溝内を転がりながら流れるボール16は、ナット13に設けられたデフレクタ18,19及びリターン通路部材20を介して、下流から上流に戻される。リターン通路部材20は、その直線部21の一方の端を第1デフレクタ18に繋ぐよう湾曲する第1接続部22と、上記直線部21のもう一方の端を第2デフレクタ19に繋ぐよう湾曲する第2接続部23と、を有している。接続部22,23は、リターン通路部材20の長手方向の端面にて開口する開口部、及び、リターン通路部材20の外周にてナット13の中心線に向って開口する開口部を有している。【選択図】図3


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    Title :

    BALL SCREW AND STEERING DEVICE


    Additional title:

    ボールねじ及びステアリング装置


    Contributors:

    Publication date :

    2017-08-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

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



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