| 摘要 |
<p>An automatic speed variating means for bicycle includes a pedal (11) having a driving rod (14), a speed controller (4) having a magnetic actuator (46) driven by the bicycle wheel and a driving chain (3) driven by the driving rod (14) wherein the depression of the pedal (11) may drive the chain (3) for normal bicycle running and the faster bicycle running may operate the magnetic actuator (46) to exert a greater torque to automatically adjust the speed controller (4) for faster speed variation.</p> |
