Ball Head is also called universal joint, which refers to the mechanical structure that uses spherical connection to realize power transmission of different shafts. Universal Joint is a very important part of the car. The combination of universal joint and drive shaft is called universal joint transmission device. On the vehicle with front engine and rear wheel drive, the universal joint transmission device is installed between the transmission output shaft and the drive axle main reducer input shaft; While the vehicle with front engine and front wheel drive omits the transmission shaft, the universal joint is installed between the front axle axle axle axle axle axle axle axle axle wheel which is responsible for both driving and steering The ball head, also called the universal joint, refers to a mechanical structure that uses spherical connections to realize the power transfer of different shafts. A universal joint is a very important part of an automobile. Universal joint and drive shaft combination, called universal joint transmission device. On the vehicle driven by the rear wheel of the front engine, the universal joint drive device is installed between the output shaft of the transmission and the input shaft of the main reducer of the drive axle; 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 wheel, which is responsible for both driving and steering