A provided electric assist bicycle can prevent an increase in the frequency of replacement of components such as a chain while achieving a satisfactory gear change, add a sufficient auxiliary driving force, prevent problems caused by interference between a mount or a battery and a front derailleur, and eliminate the need for developing a special front derailleur. A crank shaft 7a receives a human driving force transmitted from the pedal and rotates about a different axis from a motor 21. The crank shaft 7a has a human-power transmission member 29 on the outer periphery of the crank shaft 7a, the human-power transmission member 29 receiving the transmitted human driving force. The crank shaft 7a has a resultant-force transmission member 29 on the outer periphery of the crank shaft 7a, the resultant-force transmission member 29 receiving the resultant force of a human driving force and an auxiliary driving force from the motor 21. A motor drive unit 20 includes a planet gear mechanism 50 that changes a gear for the resultant force of a human driving force and an auxiliary driving force from the motor 21.


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    Title :

    ELECTRIC ASSIST BICYCLE


    Additional title:

    FAHHRAD MIT ELEKTRISCHEM HILFSFANTRIEB
    BICYCLETTE À ASSISTANCE ÉLECTRIQUE


    Contributors:

    Publication date :

    2021-06-09


    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