To provide a motor drive unit and a power-assisted bicycle in which auxiliary driving force from a motor is not transmitted to a crank shaft when a rider stops pedaling, and torque detection capability can be appropriately maintained while allowing the torque to be detected by a magnetostriction type torque sensor, and allowing the rotation of the crank shaft or the like to be detected.SOLUTION: A motor drive unit 20 includes a drive sprocket 13 for outputting the rotation of a crank shaft 7a, an auxiliary driving force output sprocket 51 for outputting auxiliary driving force from a motor 21, a rotation body 11 that rotates together with the crank shaft 7a, a rotation detector 10 for detecting the rotation of the rotation body 11, and an intermediate cylindrical body 23 engaged with a human power transmission body 28. The intermediate cylindrical body 23 includes a first inner diameter part disposed on an outer peripheral side of the crank shaft 7a and a second inner diameter part, whose diameter is larger than that of the first inner diameter part, which is coaxial with the first inner diameter part. The rotation body 11 is provided outside the second inner diameter part and on the outer periphery of the intermediate cylindrical body 23.SELECTED DRAWING: Figure 2

    【課題】磁歪式のトルクセンサによりトルクを検出でき、かつクランク軸などの回転を検出することができながら、搭乗者がペダルを漕ぐことを止めた際に、モータからの補助駆動力がクランク軸に伝達されることがなく、トルクの検出能力を良好に維持することができるモータ駆動ユニット及び電動アシスト自転車を提供する。【解決手段】モータ駆動ユニット20は、クランク軸7aの回転を出力する駆動スプロケット13と、モータ21からの補助駆動力が出力される補助駆動力出力スプロケット51と、クランク軸7aと共に回転する回転体11と、回転体11の回転を検出する回転検出器10と、人力伝達体28と噛み合う中間筒体23とを備える。中間筒体23は、クランク軸7aの外周側に配設される第1の内径部と、第1の内径部と同軸であり、第1の内径部より大径の第2の内径部とを有し、回転体11は、第2の内径部の外方で中間筒体23の外周に設けられている。【選択図】図2


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    Title :

    MOTOR DRIVE UNIT AND POWER-ASSISTED BICYCLE


    Additional title:

    モータ駆動ユニット及び電動アシスト自転車


    Contributors:

    Publication date :

    2019-02-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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    Free access