| 摘要 |
<p>A power-assisted bicycle (10) includes a controller for detecting a torque value of a pedaling torque applied to a crankshaft (36) and controlling an output of a brushless motor (46) according to the torque value detected is provided. The power-assisted bicycle (10) includes further: power transmitting means for outputting the pedaling torque applied to the crankshaft (36) to a rear wheel (WR) and including a clutch unit for permitting an output of a driving force of the brushless motor (46) to the rear wheel (WR), but not an output of power from the rear wheel (WR) to the brushless motor (46), and selector means for selecting whether or not to permit transmission of power from the rear wheel (WR) to the brushless motor (46). The clutch unit includes a lock-up ratchet for selectively permitting an output of power from the rear wheel (WR) to the brushless motor (46) according to an operation of the selector means.
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