A bar speedchangingdevice (48) comprising a pair of upper rollers (55, 55 ') and a pair of lower rollers (59, 59 ').
杆件速度变换装置(48)，包括一对上部辊子(55,55)和一对下部辊子(59,59)。
2
The utility model can realize the stepless speed change and has reliable positioning and easy speed change operation and is an ideal speedchangingdevice for the line driving bicycles.
本实用新型可实现无级变速，定位可靠，变速操作方便，是线传动自行车的一种理想变速装置。
3
The speedchanging gear is a power shunting system formed by power transferring device and power adjusting device.