| 摘要 |
A power-assist system for a bicycle by which the bicycle (10) can be operated in various modes. There is a pedal-alone mode, a power assist mode, a combined pedaling and power-assist mode, and a coasting mode. An overriding clutch (180) is positioned between the pedal section and the sprocket (28), and a second overriding clutch (188) is positioned between a speed reducing gear section (64), driven by a motor (68), and a power-assist shaft (66) located in the crank housing (86).
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