| 摘要 |
PURPOSE: A powertrain of an electric bicycle is provided to simplify the structure for a power transmission by directly applying the torque of a driving motor to a driving sprocket. CONSTITUTION: A powertrain of an electric bicycle comprises a hollow rotor(11) and a crank shaft. The hollow rotor is expanded to the shaft while having a hollow pipe shape. The hollow rotor is axis-rotated and comprises a receiving portion. The crank shaft is inserted into the hollow rotor shaft. The both ends of the crank shaft are combined with a pedal. The crank shaft comprises a protrusion. The protrusion is included of an elasticity rib and is combined according to the rotation of pedal in the receiving portion. |
