A bar speed changing device (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)。
The utility model can realize the stepless speed change and has reliable positioning and easy speed change operation and is an ideal speed changing device 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。
The speed changing gear is a power shunting system formed by power transferring device and power adjusting device.
所述变速器是 一个由动力传输装置和动力调节装置构成的动力分流系统。
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