The so-called precision universal joint refers to a mechanical structure that realizes power transmission of different shafts by using a ball connection. The combination of precision universal joint and transmission shaft is called universal joint transmission device. On vehicles with front-engine rear-wheel drive, the universal joint transmission is installed between the output shaft of the transmission and the input shaft of the main reducer of the drive axle; while vehicles with front-engine front-wheel drive omits the transmission shaft, the universal joint is installed Between the half axle of the front axle and the wheels, which are both responsible for driving and steering.

Precision universal joints are divided into WSD type and WS type, of which the former is a single-section precision universal joint, the latter is a double-section precision universal joint; the maximum angle between each section of the precision universal joint is Forty-five degrees. Precision universal joints can be made into different types such as keyway, hexagonal hole and square hole according to different requirements of users. The precision universal joint allows the angle between the two shafts to change with the work needs within a limited range when working. In addition, precision universal joints are also divided into two types with sliding bearings and needle bearings. Among them, the dynamic load of the universal joint with needle bearings is higher, the U-Joint With 2 Welded Plate Type And 2 High Wing Bearings clearance is smaller, and the maximum speed can reach 4000rpm. The maximum speed is about four times higher.