| 摘要 |
<p>A power-assisted bicycle of the center motor type is proposed which includes an internally mounted transmission and has a regenerative function with the least complexity of the structure. The bicycle includes a transmission (5) comprising a planetary gear, a one-way clutch (2) for reverse input, and a clutch switching device (9), which are all mounted in a hub (1) of the drive wheel. The transmission (3) includes at least one sun gear and transmits driving force from a sprocket (7) to the drive wheel. The bicycle further includes a transmission control mechanism (10) for selectively rotationally fixing the sun gear to the axle (5) to change speed when driving force is applied. The one-way clutch (2) for reverse input is disposed between the at least one sun gear (5a) and the axle (11), and selectively rotationally fix the sun gear to the axle (11) by the operation of the clutch switching device (9) when reverse input is applied. While the bicycle is being driven, the clutch switching device (9) moves the one-way clutch (2) for reverse input to the rotatable state, so that driving force is transmitted. While the bicycle is traveling without being driven, the one-way clutch is locked, so that reverse input is transmitted to the sprocket (4).</p> |
