This study focuses on discussing the design of the device and the dual power transmission system.After analyzed the relative motion between the ground and vehicle wheel structure,tripod and outer ring the model of Cool running car mechanics was set up,and finally calculate the two-wheeled vehicle structure that could satisfy the requirement of actual driving parameters.The steering,braking principle and corresponding structure are explained in detail in this paper.This product is cool and interesting,it is suitable for exercising.It can also serve as a sightseeing car for...