The increase of the rear/center length in an electric-motor-assisted bicycle including a drive unit attached to the vehicle-body frame is minimized. The electric-motor-assisted bicycle (10) includes a vehicle-body frame (12) and a drive unit (20). The drive unit includes two attachment portions (216, 217). The vehicle-body frame includes a bracket (125) and a pair of chain stays (301). The drive unit is attached to the bracket. Each of the chain stays is attached to a position on the bracket that is rearward of the crank axle (22) as measured in the front/rear direction with respect to the bicycle. One attachment portion is located forward of the crank axle as measured in the front/rear direction with respect to the bicycle. The other attachment portion is located rearward of the crank axle as measured in the front/rear direction with respect to the bicycle. At least one of the region (125D) in the bracket to which the chain stay is attached and the region (125F) in the bracket to which the other attachment portion is attached does not overlap a line segment (SL1) connecting the shaft center of the axle (141) of the rear wheel (14R) to the shaft center of the crank axle as viewed from a side of the bicycle.


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    Title :

    ELECTRIC-MOTOR-ASSISTED BICYCLE


    Additional title:

    ELEKTROMOTORUNTERSTÜTZTES FAHRRAD
    BICYCLETTE ASSISTÉE PAR MOTEUR ÉLECTRIQUE


    Contributors:

    Publication date :

    2021-02-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer / B62K Fahrräder , CYCLES



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