Stepless variable speed rear drive shaft for bicycles

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Stepless variable speed rear drive shaft for bicycles

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SUN XIAOYAN / YANG XU / LI XIANMING

The invention relates to a variable speed rear drive shaft for bicycles, in particular to a stepless variable speed rear drive shaft for bicycles. The shaft comprises a fixed central shaft body, a rear shaft small chain wheel and a rear shaft hub which are arranged on the fixed central shaft body. The rear shaft hub is located on one side of the rear shaft small chain wheel. A first planetary movable shaft wheel train, a wedge claw type stepless speed changing mechanism, a second planetary movable shaft wheel train and a third planetary movable shaft wheel train are arranged on one side of the rear shaft small chain wheel sequentially and are located in the inner cavity of the rear shaft hub. Thus, the stepless variable speed rear drive shaft for bicycles has the advantages of high controllability allowing the variable speed to be in place instantaneously through simple actions, fine acceleration performance allowing continuous gradient-type shifting in various states, highly professional adaptability allowing high torque, low rotation speed and high transmission efficiency, high practicality allowing large adaptive coverage in the large speed ratio range, small size, lightness, noise avoidance and complete-tightness lubrication and the like.