[PROBLEMS] To achieve miniaturization of an electric power assist unit for a bicycle.[SOLUTIONS] An electric power assist unit includes a plurality of sun gears each having a different number of teeth and configured to selectively receive a pedaling force from a rider; a first planetary gear having a tooth flank meshed with each of the plurality of sun gears; an electric motor configured to generate a drive force for assisting the pedaling force; a sun gear different from the plurality of sun gears and configured to receive the drive force from the electric motor; a second planetary gear configured to revolve and rotate integrally with the first planetary gear and meshed with the sun gear different from the plurality of sun gears; a ring gear non-rotatably provided in and meshed with the second planetary gear; a carrier supporting the first planetary gear and the second planetary gear; and a case connected to the carrier and configured to transmit at least one of the pedaling force or the drive force to a drive wheel.


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    Title :

    ELECTRIC POWER ASSIST UNIT FOR BICYCLE, AND ELECTRIC POWER ASSISTED BICYCLE


    Additional title:

    ELEKTRISCHE HILFSKRAFTEINHEIT FÜR FAHRRAD UND ELEKTRISCHES HILFSKRAFTFAHRRAD
    UNITÉ D'ASSISTANCE ÉLECTRIQUE POUR BICYCLETTE, ET BICYCLETTE À ASSISTANCE ÉLECTRIQUE


    Contributors:

    Publication date :

    2025-06-11


    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



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