Transferring power, the automobile shaft is also called the drive shaft, is the transmission of torque between the gearbox reducer and the driving wheel shaft, the inner and outer ends of each have a universal joint, respectively through the spline on the universal joint and reducer gear and hub bearing inner ring connection. The role of the automobile half axle is: 1. The road surface reaction force and torque are transmitted to the frame through the plate spring; 2. It acts as a brake when the car is running. According to the different types of support, the automobile half axle can be divided into: full floating half axle, three quarters floating half axle, half floating half axle. The symptoms of the damage of the car axle are: 1. The car runs sideways and shakes violently. 2. Wheel falls off; 3. Abnormal sound occurs when the car is running.