A drive unit for an electrically assisted bicycle includes a housing and a rotatable shaft made of metal materials different from each other, an outer circumferential portion of a dust seal in contact with an inner circumferential portion of an opening of the housing that allows the rotatable shaft to extend therethrough, and an outer end, in a rotation axis direction of the rotatable shaft, of the inner circumferential portion of the opening of the housing including a chamfered portion having a diameter increasing toward an outside of the opening. The dust seal includes a first lip covering the chamfered portion, and the dust seal does not protrude outward, in the rotation axis direction, of an outermost portion of the opening in the rotation axis direction.


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    Title :

    DRIVE UNIT FOR ELECTRICALLY ASSISTED BICYCLE AND ELECTRICALLY ASSISTED BICYCLE


    Contributors:
    AKAZAWA YUTA (author) / EMI KENTA (author)

    Publication date :

    2025-06-05


    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