The main function of the auto hub bearing is to load and provide precise guidance for the rotation of the auto hub. It is both an axial load and a radial load and is a very important component. The traditional automotive wheel bearings are composed of two sets of tapered roller bearings or ball bearings. The installation, oiling, sealing and clearance adjustment of the bearings are carried out on the automobile production line. This structure makes it difficult to assemble in a car production plant, high in cost, and poor in reliability, and the car needs to be cleaned, oiled and adjusted at the time of maintenance. The auto hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It integrates two sets of bearings and has good assembly performance, can eliminate play adjustment, light weight, compact structure and load capacity. Large, sealed bearings can be pre-loaded with grease, omitting external auto hub seals and maintenance-free. They have been widely used in cars, and there is a tendency to gradually expand applications in trucks.

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