| 摘要 |
Disclosed is an automatic gearshift structure for a bicycle. An existing bicycle which is used as a common transportation means is driven in low speed by shifting gears when running on a flat ground and driving up on an uphill road. Also, a driver should ride the existing bicycle by properly shifting gears according to a road condition. A gearshift structure is operated since the position of a lever located in a predetermined point of a bicycle handlebar is changed. In the automatic gearshift structure, two cylinders are placed at fixed intervals to automatically shift a speed without changing the position of the lever and contain a liquid for horizontality. Therefore, the automatic gearshift structure for a bicycle measures an angle according to a road angle on the uphill road and shifts the gears. [index]a bicycle, a gearshift. |
