PROBLEM TO BE SOLVED: To provide a power-assisted bicycle and a motor drive unit which show an excellent bodywork handling performance even during regenerative operation and can prevent the rotational torque to rotate the pedal from becoming heavier or prevent fluctuations of the rotational torque from being conveyed to the pedal, such as when traveling at high speed.SOLUTION: A motor drive unit 20 comprising a motor 21 is arranged in an intermediate position between the front wheel and the rear wheel and is configured to be transmittable of the rotation of the rear wheel to the motor 21 via the chain. The motor drive unit 20 includes: a passive torque transmission path for transmitting, to the motor, the regenerative passive torque transmitted from the rear wheel to a drive force output wheel body via the chain; and torque transmission switching means for switching the passive torque transmission path between a transmitting state and a non-transmitting state.SELECTED DRAWING: Figure 4

    【課題】回生動作ができながら、車体の取り回し性能が良く、かつ、高速走行時などに、ペダルを回す回転トルクが重くなったり回転トルクの変動がペダルに伝わったりすることを防止できる電動アシスト自転車およびモータ駆動ユニットを提供する。【解決手段】モータ21を備えたモータ駆動ユニット20が、前輪と後輪との間の中間位置に配置され、後輪の回転がチェーンを介してモータ21に伝達可能に構成され、チェーンを介して後輪から駆動力出力輪体に伝達された回生用の受動回転力をモータに伝達する受動回転力伝達経路をモータ駆動ユニット20に有し、前記受動回転力伝達経路を伝達状態と非伝達状態(接続状態と切断状態)とに切り替える回転力伝達切替手段が設けられている。【選択図】図4


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    Title :

    POWER-ASSISTED BICYCLE AND MOTOR DRIVE UNIT


    Additional title:

    電動アシスト自転車およびモータ駆動ユニット


    Contributors:

    Publication date :

    2018-10-11


    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 / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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    Free access