弹簧式无级变速链轮的设计

Design of Continuously Variable Transmission Sprocket Wheel

针对变速自行车需要手动换挡,而且手动换挡后存在传动比不匹配当前阻力状况的问题,提出一种利用弹簧力的连续性实现无级变速的机械式自行车无级变速装置的方案,并通过使弹簧力方向与阻力方向之间存在一个变化的夹角的方法,使主动链轮分度圆直径变化量与弹簧压缩量之间呈现非线性关系,扩大可无级变速的有效阻力范围。通过计算得出了主动链轮分度圆直径变化量与弹簧压缩量之间的函数关系式。最后,对方案进行仿真分析,获得应力云图,验证了本方案的可行性。

For variable-speed bicycle need to manually shift,and after the manual shift the resistance ra⁃tio does not match the current situation of problem,a set of utilizing the continuity of spring force to realize con⁃tinuously variable transmission mechanical bicycle scheme of continuously variable transmission device is put forward,and through the spring force direction and the resistance between a change in the direction angle meth⁃od,make the drive sprocket pitch circle diameter variation with a non-linear relationship between amount of spring compression,increase the effective resistance range of continuously variable transmission.Then the func⁃tional relationship between the diameter change of the dividing circle of the active sprocket and the spring com⁃pression is obtained through calculation.Finally,the scheme is simulated and the stress cloud diagram is ob⁃tained.The simulation results verify the feasibility of the scheme.