| 摘要 |
PROBLEM TO BE SOLVED: To accomplish simplification of an auxiliary motive power mechanism used in an electric assist bicycle and to facilitate mounting to a body frame of the bicycle. SOLUTION: The electric assist bicycle travelable by assisting stepping force by electric power is provided with a rotatable sprocket 2 for transmitting the stepping force to a drive wheel; an electric motor 37 for outputting the electric force from an output shaft 37a; an assist gear 30 connected to the output shaft 37a through a gear mechanism 40; and a pin 123 for coaxially connecting the assist gear to the sprocket 2. These constitution elements are arranged on a common base 50 to constitute one unit 11 detachable from the body frame. An elastic member 127 is covering a head part of the pin 123. The sprocket 2 is provided on an engagement area with the pin. Thus, the electric power provided to the assist gear 30 is transmitted to the sprocket 2 through the pin 123 and the elastic member 127. COPYRIGHT: (C)2007,JPO&INPIT
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