| 摘要 |
<p>An electric device of an electric bike utilizes the tire direct contact method for driving the tire (70) through pressure friction. The main bracket members (30,40) supporting a driving roller (20) in contact with the tire (70) are installed to be rotated in operation and also fixed to the seat tube (60) of the bike. By making the driving roller (20) contacting the tire (70) through a spring (49), the wheel of the bike can rotate with a minimum friction force depending on the road condition by the dynamical arrangement between a center of the wheel, a contact point of the driving roller (20) and the tire (70), and a hinge point serving as a center of rotation. This has the effect that the driving roller (20) can automatically change position by adjusting automatically the pressure between the tire (70) and the driving roller (20) with a minimum friction pressure being able to rotate the wheel depending on the road condition. So, the consumption of electric energy is substantially reduced and also a loss of electric energy is reduced by preventing free running of the driving roller (20). <IMAGE></p> |
