The role of drive shafts in auto parts is still very powerful and should not be underestimated.In a car with front-engine rear-wheel drive (or all-wheel drive), due to the deformation of the suspension during the movement of the car, there is often relative movement between the input shaft of the drive shaft final drive and the output shaft of the transmission (or transfer case). In addition, in order to effectively avoid certain mechanisms or devices (which cannot achieve linear transmission), there must be a device to achieve the normal transmission of power, so universal joint transmission appears.

　　A constant velocity universal joint is a universal joint that transfers the output shaft and the input shaft connected to the universal joint at an instantaneous angular velocity that is always the same.Constant velocity universal joint is a mechanism that connects two shafts whose axes do not coincide and makes the two shafts transmit motion at the same angular velocity.It is a universal joint where the rotation speed (angular velocity) of the driving shaft and the driven shaft are equal.

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