Drive shaft is a rotating body with high speed and little support, so its dynamic balance is very important. The general drive shaft before leaving the factory must be into the action balance test, and the balance machine has been adjusted. For the front engine rear wheel drive car is the transmission of rotation to the main reducer shaft, it can be several sections, and between the joints can be connected by the universal joint.

The drive shaft is composed of shaft tube, telescopic sleeve and universal joint. The telescopic sleeve can automatically adjust the change of distance between the transmission and the drive axle. Universal joint is to ensure the change of the Angle between the two axes of the transmission output shaft and the input shaft of the drive axle, and realize the equiangular speed transmission of the two shafts.

The reasons for the loosening of the drive shaft support are analyzed as follows:

1. The flange connection of the transmission shaft (or the connecting bolt) is loose, resulting in sound.

2. Grease nozzles (commonly known as grease nozzles), cross shaft oil passage is blocked and grease is not injected, grease is not injected on schedule, cross shaft oil seal

3, to the cross shaft installation configuration is too tight.

4, sleeve and universal joint fork hole match loose, loose support piece bolt affect sleeve operation, make universal joint fork hole wear is too large, loose and lead to sound.

5, gearbox second shaft spline and flange spline wear is too large, the formation of loose and loose resulting in sound.