| 摘要 |
PURPOSE: An automatic nonstep variable speed gear is provided to automatically change gears without manipulating a transmission by changing speed ratio in proportion to the size of driving resistance. CONSTITUTION: An automatic nonstep variable speed gear comprises a shaft(102), an one way unit(110), a carrier unit, a driving wheel unit(140), and a control unit. The shaft is rotatably assembled to a boss of a bicycle, and a first pedal crank and a second pedal crank are assembled to both sides of the shaft. A first gear(104) is arranged in one side of the external diameter of the shaft. The one way unit is coupled to the boss and the backward rotation of an outer ring is prevented in an inner ring. A second gear is formed in the outer diameter of the outer ring. The carrier unit is rotatably arranged in the shaft in an idle state. A third gear(122) engaging with a first gear is installed in one side of the carrier unit and a fourth gear engaging with the third gear is arranged in the other side. The driving wheel unit is rotatably arranged in the shaft in the idle state. A sixth gear is formed in one side of a cylinder body(142) and an electric unit is connected to one side of an outer diameter of the cylinder body. |
