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.
For cars with double universal joint cross shaft steering shaft installation space is limited, difficult to meet the constant speed driving conditions, need to adjust the phase.
The universal joint bearing is installed between the front axle axle and the wheel, which is responsible for both driving and steering. In front-engine rear-wheel drive vehicles, the universal joint transmission is installed between the transmission output shaft and the drive axle main reducer input shaft.