In the past, single row tapered roller or ball bearings were mostly used in pairs. With the development of technology, car hub unit has been widely used in cars. The application scope and quantity of hub bearing unit are increasing day by day, and it has developed to the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange used to fix the bearing on the outer raceway, which can simply cover the bearing on the axle and fix it with nuts. Make the maintenance of the car easier. The third generation of hub bearing unit is a combination of bearing unit and anti lock brake system. The hub unit is designed with inner flange and outer flange. The inner flange is fixed on the drive shaft with bolts, and the outer flange installs the whole bearing together.

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Wheel hub is also called wheel rim. According to the characteristics and requirements of different models, the wheel hub surface treatment process will take different ways, which can be roughly divided into baking paint and electroplating.

The hub of ordinary car is less considered in appearance, and good heat dissipation is a basic requirement. The process basically adopts baking paint treatment, that is, spraying first and then electric baking. The cost is more economical, and the color is beautiful and lasts for a long time. Even if the car is scrapped, the color of the hub remains unchanged. Many Volkswagen wheel hub surface treatment process is baking paint. Some fashionable avant-garde, dynamic color wheel hub is also the use of paint technology. This kind of hub is moderate in price and complete in specifications.