To provide a bearing unit which can easily perform caulking by a weak force at the assembling of an inner ring, a ball screw device having the bearing unit, and a steering device having the ball screw device.SOLUTION: A bearing unit 50 comprises a main body part 213, a shaft member 21, a double-row bearing 70 and a spacer 61. A bearing support part 212 comprises an external peripheral face and an annular groove 217 which is formed at a part of the support part on its first end side and in which the spacer 61 is arranged. A caulking part imparts a pressing force applied to the first inner ring 53 side to the spacer 61 in a post-caulking state, and has a flange-shaped pre-caulking shape having an outside diameter for allowing the insertion of the first inner ring 53, and having an external peripheral face larger in diameter than an inside diameter of the spacer 61 in a pre-caulking state. Then, the double-row bearing 70 comprises an outer ring 51, a second inner ring 52 being one portion of an external peripheral face of the shaft member 21, a first inner ring 53 formed of a body different from the shaft member and fit to the external peripheral face of the bearing support part, and rolling bodies 54.SELECTED DRAWING: Figure 3

    【課題】内輪の組み付け時において小さな力で容易にカシメが行なえる軸受ユニット、軸受ユニットを備えたボールねじ装置及びボールねじ装置を備えたステアリング装置を提供する。【解決手段】軸受ユニット50は、本体部213、軸部材21、複列軸受70及びスペーサ61を備える。軸受支持部212は、外周面と、支持部の第一端側の一部に設けられスペーサ61が配置される環状溝217と、を備える。カシメ部は、カシメ後の状態でスペーサ61に第一内輪53側への押付力を付与し、カシメ前の状態で、第一内輪53を挿入可能な外径で、且つ、スペーサ61の内径より大径の外周面を有する鍔状のカシメ前形状を有する。そして、複列軸受70は、外輪51と、軸部材21の外周面の一部分である第二内輪52と、軸部材と別体で形成され軸受支持部の外周面に嵌合される第一内輪53と、転動体54とを備える。【選択図】図3


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    Title :

    BEARING UNIT, BALL SCREW DEVICE AND STEERING DEVICE


    Additional title:

    軸受ユニット、ボールねじ装置及びステアリング装置


    Contributors:

    Publication date :

    2019-10-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

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



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