| 摘要 |
PROBLEM TO BE SOLVED: To attain regenerative charging without complicating a device, in a power-assisted bicycle with a two-way clutch from an output shaft of a motor up to a transmission element such as a chain. SOLUTION: In this power-assisted bicycle, a hub 1 of a driving wheel includes a shift mechanism 3 constituted of a planetary gear mechanism, a one-way clutch 2 for a reverse input and a shift control mechanism 10. The shift mechanism 3 includes a sun gear 3a and transmits a driving force to the driving wheel through a sprocket 4. The shift control mechanism 10 switches the sun gear 3a to be rotatable or non-rotatable around an axle 5 via a one-way clutch 3i for shift to perform the shift in relation to the driving force. A two-way clutch capable of switching a lock direction is provided in a driving force transmission route from the output shaft of the motor to a transmission element. By making the sun gear 3a non-rotatable around the axle 5 via a one-way clutch 2 for a reverse input, the reverse input is transmitted from the sprocket 4 to the motor via the transmission element and the two-way clutch. COPYRIGHT: (C)2011,JPO&INPIT
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