The drive shaft is a rotating body with high speed and less support, so its dynamic balance is very important.Generally, the drive shaft must undergo a dynamic balance test before leaving the factory and be adjusted on a balance machine.For a front-engine rear-wheel drive car, the rotation of the transmission is transmitted to the shaft of the final reducer. It can be several sections, and the sections can be connected by universal joints.

　　Generally, the universal joint is composed of a cross shaft, a cross bearing and a flange fork.The universal joint is a key component on the drive shaft of an automobile.On the front-engine rear-wheel drive vehicle, the universal joint drive shaft is installed between the transmission output shaft and the drive axle final drive input shaft; while the front-engine front-wheel drive vehicle omits the drive shaft, and the universal joint is installed Between the front axle half shaft and the wheels, which are responsible for both driving and steering.

　　When the vehicle is running, the uneven road surface will cause bounce, load changes or the difference in the installation position of the two assemblies will cause the angle and distance between the transmission output shaft and the input shaft of the drive axle final reducer to change. "Strain" device to solve this problem, so there is a universal joint.

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