| 摘要 |
PURPOSE: A bicycle gearbox for speed-changing the input of a motor and a pedal in a multi stage is provided to freely speed-change the input power of a motor and a pedal from a low speed to a high speed through a transmission. CONSTITUTION: A bicycle gearbox for speed-changing the input of a motor and a pedal in a multi stage comprises a carrier(210), a ring gear(220), first-level pole(230), a multi-stage planet gear(240), a second-level linear gear(251), a third-level linear gear(252), a transmission controller(300) and a sliding ring. One side of the carrier is meshed with a motor. The other side of the carrier is connected to or engaged with a driver connected to a sprocket. The ring gear is connected to the carrier. The first-level pole is installed in the carrier. The first-level pole is directly connected to the ring gear. The multi-stage planet gear increases the speed the ring gear. The second-level gear and the third-level gear engage with the multi-stage planet gear. The transmission controller selectively controls a second-level pole(301) and a third-level pole(302). The sliding ring makes the torque of the driver selectively input to the transmission controller. |
