Flywheel Device of Bicycle

Abstract

Disclosed is a flywheel device of a bicycle, including a flywheel means, a clutching means and a speed transforming means. The flywheel means is installed in rotation with the frame that is placed between the driving wheel and the driven wheel. The clutching means is engaged or disengaged between the flywheel means and the driving wheel according to an engaging state and a disengaging state thereof, wherein, a rotational energy is transferable between the flywheel means and the driving wheel during in the engaging state. The speed transforming means is connected between the flywheel means and the driving wheel by means of the clutching means to adjust a transmission ratio in relation to the driving wheel and the flywheel means.

What is claimed is:  
     
         1 . A flywheel device of a bicycle, the bicycle having a frame, a driving wheel and a driven wheel, the flywheel device comprising:
 a flywheel means installed on the frame that is placed between the driving wheel and the driven wheel, a rotation axis of the flywheel means being substantially parallel to a rotating axis of the driving wheel;   a clutching means, engaged or disengaged between the flywheel means and the driving wheel according to an engaging state and a disengaging state thereof, wherein, a rotational energy is transferable between the flywheel means and the driving wheel during in the engaging state; and   a speed transforming means connected between the flywheel means and the driving wheel by means of the clutching means to adjust a transmission ratio in relation to the driving wheel and the flywheel means.   
     
     
         2 . A flywheel device as claimed in  claim 1 , wherein the driving wheel is a rear wheel of the bicycle. 
     
     
         3 . A flywheel device as claimed in  claim 1 , wherein the flywheel means is positioned between a down tube and a seat tube of the frame. 
     
     
         4 . A flywheel device as claimed in  claim 3 , wherein the flywheel means has a flywheel edge partly extending beyond a top tube of the frame. 
     
     
         5 . A flywheel device as claimed in  claim 1 , wherein the flywheel means is rotated in connection with the driving wheel via a transmission member. 
     
     
         6 . A flywheel device as claimed in  claim 1 , wherein the clutching means is provided with a handling member for shifting the clutching means in the engaging state or the disengaging state. 
     
     
         7 . A flywheel device as claimed in  claim 1 , wherein the speed transforming means includes an input transforming assembly and an output transforming assembly, the input transforming assembly is provided to adjust an input transmission ratio of the driving wheel to the flywheel means, and the output transforming assembly is provided to adjust an output transmission ratio of the flywheel means to the driving wheel. 
     
     
         8 . A flywheel device as claimed in  claim 7 , wherein the input transmission ratio of the driving wheel to the flywheel means is adjusted as an acceleration transmission ratio by the input transforming assembly. 
     
     
         9 . A flywheel device as claimed in  claim 7 , wherein the output transmission ratio of the flywheel means to the driving wheel is adjusted as an acceleration transmission ratio by the output transforming assembly. 
     
     
         10 . A flywheel device as claimed in  claim 1 , further comprising a ratchet means assembled between the flywheel means and the driving wheel via the speed transforming means.