Wheel hub bearing unit is in the standard angular contact ball bearings and tapered roller bearings, on the basis of it will be two sets of bearing as a whole, has the assembly clearance adjustment performance is good, can be omitted, light weight, compact structure, large load capacity, for the sealed bearing prior to loading, ellipsis external wheel grease seal and from maintenance etc, and has been widely used in cars, in a truck also has a tendency to gradually expand the application.

The first generation is composed of double row angular contact bearings.

The second generation has a flange on the outer raceway to hold the bearing in place.It makes it easy to repair cars.

The third generation hub bearing unit is equipped with the bearing unit and ABS anti-lock brake system.The hub unit is designed with an inner flange and an outer flange, the inner flange bolted to the drive shaft, and the outer flange mounting the entire bearing together. 

The fourth generation hub bearing unit integrates the constant speed universal joint with the bearing as a whole, which solves the shortcoming of the existing technology in which the size of the hub increases due to the integral structure of the hub and constant speed universal joint, resulting in the increase of weight.The development of the fourth generation hub bearing unit has been successful and it is believed that it will be widely used in all kinds of automobiles in the near future.The features of these unit products are: there is no need to adjust the bearing assembly clearance, the bearing assembly process is more reasonable, the weight is reduced, the volume is reduced, the one-time grease can be used almost permanently, the overall production cost is reduced, more conducive to large-scale popularization.