| 摘要 |
The present invention relates to a pulley capable of changing speeds in multiple stages. A central shaft is rotationally supported by a housing. A fixed shaft is coupled to the housing to surround the central shaft and not to be rotated. The covers the central shaft and is rotationally supported, wherein while transmitting rotary force to the central shaft, direct connection and changing speed to a second stage or dual speed change are performed. |
