What are the causes of humming noise from the axle shaft?

[SanBrynlee]

The causes of humming noise from the axle shaft are: 1. Loose axle shaft bolts causing abnormal noise from the loose connection; 2. Broken teeth on the differential planetary gears. The functions of the axle shaft are: to transmit power, also known as the drive shaft, it is the shaft that transmits torque between the transmission reducer and the drive wheel, with a universal joint at each end, connected to the reducer gear and the hub bearing inner ring via splines on the universal joint. The roles of the axle shaft are: 1. To transmit the reaction force and torque from the road surface to the frame through the leaf spring; 2. To act as a brake during vehicle movement. Axle shafts can be classified based on support types into: full-floating axle shafts, three-quarter floating axle shafts, and semi-floating axle shafts. Symptoms of axle shaft damage include: 1. Vehicle deviation and severe shaking; 2. Wheel detachment; 3. Abnormal noises during vehicle operation.