An electrically assisted bicycle which can be provided with a transmission mechanism in a so-called motor drive unit and can also minimize discomfort and shock to a rider during a gear change is provided. A speed reduction mechanism 25 provided in a motor drive unit 20 includes a low-speed reduction gear 36, a high-speed reduction gear 41, a low-speed one-way clutch 51 disposed between the low-speed reduction gear 36 and a resultant-force transmission member 29, a high-speed one-way clutch 52 disposed between the high-speed reduction gear 41 and the resultant-force transmission member 29, and a selection clutch 45 removably engaged with the high-speed one-way clutch 52. The selection clutch 45 is engaged with the high-speed one-way clutch 52 so as to place the high-speed one-way clutch 52 into a free state, whereas the selection clutch 45 is disengaged from the high-speed one-way clutch 52 so as to activate the high-speed one-way clutch 52.


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    Title :

    ELECTRICALLY ASSISTED BICYCLE


    Additional title:

    ELEKTRISCH UNTERSTÜTZTES FAHRRAD
    VÉLO À ASSISTANCE ÉLECTRIQUE


    Contributors:

    Publication date :

    2018-10-24


    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






    ELECTRICALLY ASSISTED BICYCLE

    KINOSHITA HIROKATSU / KATAYAMA SATOSHI / KOGA TOSHIO | European Patent Office | 2018

    Free access

    Electrically assisted bicycle

    KAWAKAMI MASAFUMI / OZAWA SATOSHI / FUJII NAOKI | European Patent Office | 2015

    Free access