| 摘要 |
A wheel hub and transmission gear arrangement of a chainless transmission mechanism for a bicycle, including a wheel hub having an axle block with an outside annular groove and intersected locating grooves, a transmission gear having an annular base mounted on the axle block, the annular base having a plurality of inward projecting blocks respectively forced into engagement with the locating grooves of the axle block and an inside annular groove, and a split binding ring mounted within the outside annular groove of the axle block and the inside annular groove of the transmission gear to firmly secure the axle block and the transmission gear together.
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