| 摘要 |
A structure of a freewheel and a hub contains a hub including a first ratchet having a pair of first teeth, a central shaft, a screw section, and a freewheel set; the hub including a first chainwheel disc assembly, a second chainwheel disc assembly, a plurality of chainwheel disks, and a screw; each chainwheel disc including a through hole, a first groove, and a second groove, a first single sprocket; the first chainwheel disc assembly includes an aperture, a recessed rim, a recess, a pair of notches, and a first double sprocket; wherein the second chainwheel disc assembly includes an opening, a second single sprocket, a raised fringe, a second ratchet and a pair of tooth, both of which are arranged on a front side of the raised fringe.
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