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Wheel bearings and bearing primary role is to provide accurate wheel rotation guide, both axial load and radial load, is a very important component. Traditional automotive wheel bearing is composed of two tapered roller bearings or ball bearing combination, bearing installation, oiled, sealed and adjust clearance are carried out in the car on the production line. This structure makes it difficult in the automotive assembly plants, high costs, poor reliability, maintenance and car maintenance, but also the need for bearing cleaning, oiling and adjustment. Developed on the basis hub bearing unit is the standard angular contact ball bearings and tapered roller bearings on, it will be two sets of bearings as a whole, has assembled a good performance, can be omitted clearance adjustment, light weight, compact, load capacity large, sealed bearings can be pre-loaded into the grease, of the hub seals and maintenance, etc. are omitted from the outside, is already widely used in cars, in the truck also has a tendency to gradually expand the application.
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