The custom universal joints is the universal joint, which is a part that realizes variable-angle power transmission, and is used for the position where the direction of the transmission axis needs to be changed. It is the joint part of the universal transmission device of the automobile drive system.

During the operation of the car, the uneven road surface will cause bounce, load changes or the position difference between the two assembly installations, etc., which will cause the angle and distance between the transmission output shaft and the input shaft of the drive axle final reducer to change. The universal joint transmission form adopts double universal joints, that is, there is a universal joint at each end of the transmission shaft. Its function is to make the angle between the two ends of the transmission shaft equal, so as to ensure that the instantaneous angular velocity of the output shaft and the input shaft are always equal.

The combination of universal joint and drive shaft is called universal joint transmission. On the front-engine rear-wheel drive vehicle, the universal joint transmission is installed between the transmission output shaft and the input shaft of the drive axle final reducer; while the front-engine front-wheel drive vehicle omits the transmission shaft, and the universal joint is installed Between the front axle half shaft and the wheels that are responsible for both driving and steering.

For ball-cage universal joints, the maintenance of automobile constant velocity joints is mainly to check the wear conditions and assembly gaps of various components in the inner and outer constant velocity joints.

The maintenance of the inner constant velocity joint includes checking the spherical shell, star sleeve, ball cage and steel ball for dents and wear. If the wear is serious, they should be replaced. The internal constant velocity universal joints can only be replaced as a whole, not individually. When the dust cover, clamp, spring retainer ring, etc. are damaged, universal joint manufacturer should be replaced.