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US 2015/0090071 A1Published application
Crank assembly of a shaft driven bicycle
OwnerJen-Chih Liuinventor
Life of this patent
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Abstract
A crank assembly of a shaft driven bicycle includes a crank arm pivoted to an axis of a bicycle frame for arranging pedal. The crank arm has at least one main transmission gear to be engaged with a passive gear of a passive shaft. Teeth of the main transmission gear face opposite to the crank arm. The main transmission gear of the crank assembly won't interfere with the axis of the bicycle, and the main transmission gear is driven directly by the crank arms for better power transmission efficiency.
Claims9
A crank assembly of a shaft driven bicycle comprising:
- a crank arm arranged to an axis of a bicycle frame having at least one main transmission gear;
- and the main transmission gear having teeth facing opposite to the crank arm;
- a passive shaft having a passive gear engaged to the main transmission gear of the crank arm;
- the passive shaft being covered by a sheath;
- wherein the main transmission gear transits cycle of the crank arm to the passive shaft.
2 more elements
Dependencies are inferred from the claim text.