Provided is a motor drive unit (20) for use in a power-assisted bicycle that can prevent oil from adhering to a control board (24b) and so on even if the control board and so on are disposed in a single-shaft motor drive unit. The motor drive unit comprising a force combining member (29) on an outer periphery of a crank shaft (7a) that receives a human driving force transmitted from the pedal, the force combining member combining the human driving force and the auxiliary driving force generated by the motor (21); a deceleration mechanism (25) having a plurality of gear portions (21c, 29b, 36c, 36d) that are engaged with each other on a transmission path of an auxiliary driving force from the motor to the force combining member; a unit casing (22) containing the motor, a central portion of the crank shaft, the force combining member, and the deceleration mechanism; a control board continued in the unit casing of the motor drive unit, and an oil guard cover (50) that serves as a partition between a region of the deceleration mechanism and a region of the control board and prevents oil on the gear portions of the deceleration mechanism from penetrating into the region of the control board wherein the oil guard cover includes a first wall portion (50a) and a second wall portion (50b), the first wall portion circumferentially covering a reduction gear of the deceleration mechanism (25) from the outer periphery, the second wall portion extending in an arc radially from a right edge of the first wall portion to a radial direction axis of the reduction gear to cover the reduction gear from a right side.


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    Title :

    POWER-ASSISTED BICYCLE


    Additional title:

    STROMUNTERSTÜTZTES FAHRRAD
    BICYCLETTE À ASSISTANCE DE PUISSANCE


    Contributors:

    Publication date :

    2018-04-04


    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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