The invention relates to the technical field of bicycles and discloses a foldable variable-speed bicycle which comprises a bicycle frame and a chain wheel, the bicycle frame is movably connected with a middle shaft through a shaft sleeve, the middle shaft is fixedly connected with the chain wheel, one end of the middle shaft is connected with a first crank through a first one-way bearing, and the other end of the middle shaft is connected with a second crank through a second one-way bearing. And the other end of the middle shaft is connected with a second crank through a second one-way bearing. According to the foldable variable-speed bicycle, the lengths of the first crank and the second crank can be adjusted according to the heights of different people, for people with long legs, the advantage of the long legs can be fully utilized, higher speed can be obtained with lower treading frequency, and for people with short legs, the first crank and the second crank cannot move to the lowest point, so that the higher speed can be obtained. The leg does not need to be straightened frequently, the probability that the knees of the user are injured is reduced, and secondly, during riding each time, the user only rotates in an interval where force is most convenient to exert, that is, the user runs in an interval with large rotating component force.
本发明涉及自行车技术领域,且公开了一种可折叠型变速自行车,包括车架和牙盘,所述车架通过轴套活动连接有中轴,所述中轴与牙盘固定连接,所述中轴的一端通过第一单向轴承连接有第一曲柄,所述中轴的另一端通过第二单向轴承连接有第二曲柄。该可折叠型变速自行车,可根据不同人的身高,调整第一曲柄和第二曲柄的长度,对于腿较长的人,可以充分利用腿长的优势,以较低的踩踏频率获得更高的速度,而对于腿短的人,由于第一曲柄和第二曲柄不会运动到最低点,腿不需要频繁的伸直,减少其膝盖受伤的几率,其次,每次骑行时,只在最方便用力的区间内转动,即旋转分力较大的区间内运行。
Foldable variable-speed bicycle
一种可折叠型变速自行车
2023-06-06
Patent
Electronic Resource
Chinese
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |