| 摘要 |
PURPOSE: A driving device for a bicycle is provided to lengthen a forward distance to a rotational radius of the same driving energy to forward, riding a bicycle when a pedal is stepped and to travel at the maximum speed with the minimum force. CONSTITUTION: A front sprocket wheel(5) is rotated and forwarded while a crank shaft(10) and auxiliary supporting bars(11,11') rotate around a fixed plain gear(4) in the same concentric circle, formed to be kept at a 120-degree interval since a planetary gear(8) and auxiliary gears(9,9') are installed. Thereby, the front sprocket does not cause the displacement of the planetary gear and the auxiliary gear when traveling by a short anchor(14) projected on both sides of an inner circumference. Herein, the travel of bicycle can be extended by transmitting rotational power to a sprocket wheel of a rear wheel as many as the number of rotation of the planetary gear on the rotation of a crank shaft(10) since the front sprocket wheel(5) is rotated as much as the planetary gear rotates between the front sprocket wheel rotates.
|
