| 摘要 |
PURPOSE: A bicycle having an auxiliary power transmission device is provided to selectively operate the power of an auxiliary power transmission device by comprising a fastening device for fastening the auxiliary power transmission device to a rotary shaft where a pedal unit is coupled and fixed. CONSTITUTION: A bicycle(100) having an auxiliary power transmission device(108) comprises a fastening device(210). The fastening device drives/ releases auxiliary sprockets(110) coupled and fixed in a rotary shaft(102a) of a pedal unit(102). The fastening device comprises a bushing, a driving unit(220), a fixing unit(240), and a lever unit(250). The bushing is thread-coupled to the rotary shaft of the pedal unit. The driving unit is coupled to the exterior of the bushing and an auxiliary sprocket is installed in the driving unit. The fixing unit is fastened and fixed in a crank(103) of the pedal unit. The lever unit is installed in the fixing unit.
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