The vehicle driving system consists of the body, the axle, the wheels and the suspension. The wheels are supported on each axle (front axle, rear axle), in order to reduce the vibration of the car when driving on uneven road surface, the axle is connected with the body through elastic suspension.
Universal joint is a mechanical part that realizes variable Angle power transmission and is used for changing the direction of the transmission axis. It is the "joint" part of the universal transmission device of the automobile drive system. The combination of universal joint and drive shaft is called universal joint transmission device.