| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal transmission hub for a bicycle equipped with a plurality of speed stages, and achieving light weight and a compact structure. SOLUTION: The internal transmission hub for the bicycle comprises: a hub axle 1; a driver 2 and a hub shell 3 rotatably supported by the hub axle 1; a power transmission mechanism 4 disposed between the driver 2 and the hub shell 3, for transmitting rotational power from the driver 2 to the hub shell 3 through a plurality of power transmission paths; and a shift mechanism 5 for selecting one of the plurality of power transmission paths. The power transmission mechanism 4 comprises a plurality of planetary gear mechanisms 6-10. A planetary gear carrier 31 of the downstream planetary gear mechanism meshes with a plurality of planetary gears 44 of the upstream planetary gear mechanism. The downstream planetary gear mechanism comprises a plurality of sun gears. COPYRIGHT: (C)2009,JPO&INPIT
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