The wheel motion is decoupled, and the wheel jumps do not interfere with each other using an independent suspension+constant velocity ball cage half axle structure. The left and right rear wheel movements are completely decoupled, and when one side of the wheel is excited by the road surface and produces vertical jumping, it will not cause motion coupling interference to the other side of the wheel; Different from the wheel to wheel linkage characteristics of integral rigid bridges and semi independent suspension systems with trailing arms, road impact only acts on the single-sided suspension system, significantly improving isolation efficiency and significantly reducing the amplitude of spring-loaded mass vibration. Equipped with CV constant velocity universal joint ball cage half shaft, the angle between the two ends of the transmission shaft is always adaptively compensated under the working conditions of large suspension stroke jumping up and down and large wheel angle deflection, and the output speed is constant throughout the entire process without fluctuation; There is no non-uniform transmission defect of ordinary spline half shaft and hard connected rear axle, eliminating the problems of transmission system vibration, abnormal noise, and eccentric wear. The fatigue loss of differential, main reducer, and transmission cross shaft is significantly reduced, and the overall life of the transmission system is improved.