The main function of a hub bearing is to bear weight and provide precise guidance for the rotation of the wheel hub. It bears both axial and radial loads, making it a very important component. 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 all carried out on the automobile production line. This structure makes it difficult to assemble in automobile production plants, costly, and less reliable. Moreover, when the automobile is maintained at a repair shop, the bearings also need to be cleaned, oiled, and adjusted. The hub bearing unit is developed based on standard angular contact ball bearings and tapered roller bearings. It integrates the two sets of bearings into one, offering advantages such as good assembly performance, elimination of clearance adjustment, light weight, compact structure, large load capacity, pre-packing of lubricating grease for sealed bearings, elimination of external wheel hub sealing, and maintenance-free. It has been widely used in passenger cars and is gradually expanding its application in trucks
