1. Different properties: the wheel hub is the rotating part of the wheel core which is connected by the column, namely the metal part which supports the center of the tire and is installed on the shaft Dao. Bearing is an important part of modern mechanical equipment.

2. Different characteristics: in order to compare the bearing resistance to pitting, when the rated life of the bearing is specified as one million revolutions (106), the maximum load that the bearing can bear is the basic rated dynamic load, expressed in C. According to the characteristics and requirements of different models, the hub surface treatment process will take different ways.

3. Different functions: the main function of the bearing is to support the mechanical rotating body, reduce its friction coefficient in the process of movement, and ensure its rotation accuracy. The third generation hub bearing unit adopts bearing unit and anti lock brake system. The hub unit is designed with an inner flange and an outer flange, the inner flange is fixed on the drive shaft with bolts, and the outer flange installs the whole bearing together.