| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a drive unit for a bicycle, which has a motor for assist running and which achieves weight saving and miniaturization.SOLUTION: A drive unit for a bicycle includes a crank shaft, a motor that has a hole enabling arrangement of the crank shaft, a power transmission shaft that is provided separately from the crank shaft and to which rotation of the crank shaft is transmitted, and an output part to which rotation of the power transmission shaft is transmitted and to which output of the motor is added.</p> |
