PROBLEM TO BE SOLVED: To improve strength of a drive unit for an impact from an external part while suppressing increase of a weight of the drive unit used on an electric assist bicycle.SOLUTION: In a drive unit 40 mounted on an electric assist bicycle 1, a shaft center L3 of a motor shaft 64 is located on the lower side in the bicycle mount state than a straight line A1 formed by connecting the shaft center L1 of a crank shaft 41 and a shaft center L2 of an output shaft 81 as seen from a shaft direction of a crank shaft 41. At least a part 61La of a lower part in a bicycle mount state of a housing 51 has a shape corresponding to a motor 61 on a part for housing the motor 61 as seen from a shaft direction of the crank shaft 41. The motor shaft 64 is located on the rear side from the crank shaft 41 in a vehicle longitudinal direction of the bicycle mount state.SELECTED DRAWING: Figure 6

    【課題】電動補助自転車に用いられる駆動ユニットの重量が増大することを抑制しつつ、外部からの衝撃に対する駆動ユニットの強度を向上する。【解決手段】電動補助自転車1に搭載される駆動ユニット40において、前記モータ軸64の軸心L3は、前記クランク軸41の軸方向から見て、前記クランク軸41の軸心L1と前記出力軸81の軸心L2を結ぶ直線A1よりも、自転車搭載状態における下方に位置づけられる。ハウジング51の自転車搭載状態における下部の少なくとも一部61Laは、クランク軸41の軸方向から見て、モータ61を収容する部分において、モータ61に対応した形状を有する。モータ軸64は、自転車搭載状態の車両前後方向において、クランク軸41よりも後方に位置づけられている。【選択図】図6


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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 / B62J Fahrrad- oder Motorradsättel oder -sitze , CYCLE SADDLES OR SEATS



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