| 摘要 |
An electric bicycle includes a light-weight crankshaft supporting unit. The crankshaft supporting unit has a U-shape and compactly supports both a battery and a pedal crankshaft. An electric motor is mounted remotely from the pedal crankshaft. A support shaft for a kick stand, a coupling shaft of a rear arm, and a mounting piece all extend between the sides of the crankshaft supporting member and add structural rigidity to the light-weight unit. The crankshaft supporting unit is compact and allows the battery to be placed lower so as to lower the bicycle's center of gravity.
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