PROBLEM TO BE SOLVED: To permit miniaturization while securing seal performance of a drive unit of an electric assist bicycle.SOLUTION: A drive unit 40 includes a housing 51 for forming a contour of a drive unit 40 and a drive motor 61 housed in the housing. The drive motor 61 has a motor shaft 64, a rotor 63 and a stator 62. The housing 51 includes a first case 53 and a second case 52 coming into contact with the first case 53 on mating surfaces 53A, 52A vertical to the motor shaft 64. The first case 53 contains a stator correspondence part 53B which is a part arranged on the radial direction outer side of the stator 62 of the drive motor 61 and is protruded to the radial direction outer side in accordance with the contour of the stator 62. An outer edge of the mating surface 53A with the second case 52 of the first case 53 has an inner part 53AP arranged on the radial direction inner side than the outer edge of the stator correspondence part 53B in the sight of shaft direction of the motor shaft 64.SELECTED DRAWING: Figure 4

    【課題】電動補助自転車の駆動ユニットのシール性を確保しつつ小型化を図る。【解決手段】駆動ユニット40は、駆動ユニット40の外形を形成するハウジング51と、ハウジング内に収納される駆動モータ61を備える。駆動モータ61は、モータ軸64、ロータ63、及びステータ62を有する。ハウジング51は、第1ケース53と、第1ケース53とモータ軸64に垂直な合わせ面53A、52Aにおいて接する第2ケース52とを含む。第1ケース53は、駆動モータ61のステータ62の径方向外側に配置される部分であってステータ62の外形に対応して径方向外側へ突出するステータ対応部分53Bを含む。第1ケース53の第2ケース52との合わせ面53Aの外縁は、モータ軸64の軸方向視において、ステータ対応部分53Bの外縁よりも径方向内側に配置される内寄部53APを有する。【選択図】図4


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    Title :

    DRIVE UNIT AND ELECTRIC ASSIST BICYCLE


    Additional title:

    駆動ユニット及び電動補助自転車


    Contributors:

    Publication date :

    2016-05-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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