| 摘要 |
<p>The present invention relates to an automatic bicycle transmission capable of being automatically shifted according to the rider's pedaling force without operation of another manual control gearshift. The automatic bicycle transmission comprises: a plurality of chain gears provided at a shaft of a bicycle; a derailleur provided at said bicycle wheel and connected said plurality of chain gears by means of a chain; a driving gear connected said chain to be rotated by a rider's pedaling force; a supporting bar movably connected at one end to said driving gear and movably connected at the other end to a frame of the bicycle by hinge; an elastic section provided between said supporting bar and said frame for controlling the pivoting of said supporting bar by expanding and contracting according to the rider's pedaling force; and a shifting wire connected to said supporting bar and said derailleur for moving said derailleur according to the pivoting of said supporting bar.</p> |
