Car wheel bearings are used in pairs in the past most single row tapered roller or ball bearings. With the development of technology, the car has been widely used car hub units. The growing scope and use of the wheel hub bearing unit has been developed to the third generation: the first generation is a double row angular contact bearing components. The second generation of the outer raceway for bearing a fixed flange, can simply be set to a fixed bearing on the axle nut. Makes the car maintenance becomes easy. The third generation wheel hub bearing units are bearing unit and uses the anti-lock brake system compatible. The hub unit is designed to have the inner flange and outer flange, the flange is bolted to the drive shaft, the entire bearing outer flange fit together. Also known as the rim wheel. According to the characteristics and needs of different models, wheel surface treatment process will take a different approach, the paint can be divided into two kinds of plating and electric wheels. Wheel bearing is currently divided into three categories, generation hub bearing / II wheel bearings, three generations of wheel bearings, think Audi / Honda and other companies old cars and low-end cars are using the generation hub bearing, demolition is difficult, the adjustment is not easy. With the upgrading of the industrial structure as well as automobile fuel economy requirements of environmental protection, lightweight vehicles are to intensive direction / development, there is the quality of service after the open as long as the engine is no longer useful, not only because it is Part of the problem as well as the installation adjustment problems. Generation hub bearing requires a lot of adjustments in the installation. The first generation is a double row angular contact bearing components. The second generation of the outer raceway for bearing a fixed flange, can simply be set to a fixed bearing on the axle nut. Makes the car maintenance becomes easy. The third generation wheel hub bearing units are bearing unit and uses the anti-lock braking system ABS compatible. Www.yjqczc.com hub unit designed to have the inner flange and outer flange, the inner flange bolted to the drive shaft, the entire bearing outer flange fit together. Mainly by the inner / outer ring / ball composition, and a holder, as well as seal the sensor unit, flange / bolt or the like. Flanges are generally no longer turning forged pipe, but also ultra-fine grinding channel needs, depending on the size of the still distinguish between good and then assembled together.