| 摘要 |
A multiple-speed chain driving device includes a shaft, a rotors'assembly, a chain driving sprocket, and a shifting assembly. The rotors'assembly is mounted on the shaft and includes three rotors which are vertically mounted on each other and enclosed within the sprocket. The shifting assembly is also mounted on the shaft and located parallel with respect to the rotors' assembly. The device can be made in either 3-speed or 2-speed design and enables a few slightly different configurations for both designs. The device enables a smooth shifting process and allows only one sprocket to produce the full range of speeds presently obtained by a front sprocket assembly in a bicycle.
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