| 摘要 |
A twin clutch hub includes a one-way roller clutch and a ratchet pawl based clutch mounted to a bicycle hub. A chain wheel seat receives driving power from a bicycle rear wheel and is in operative coupling with the one-way roller clutch and the ratchet pawl based clutch, which are in turn operatively coupled to the hub. When the ratchet pawl based clutch shows a returning side tooth backlash that is greater than or equal to an angle of deformation of the one-way roller clutch, transmission is performed with the one-way roller clutch to make backlash approximating zero. When the angle of returning side tooth backlash of the ratchet pawl based clutch is smaller than or equal to the angle of deformation of the one-way roller clutch, transmission is performed through both the one-way roller clutch and the ratchet pawl based clutch to realize high efficiency twin clutch hub.
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