Wheel hub bearings used in automobiles
The main function of the hub bearing is to bear load and provide precise guidance for the rotation of the hub. It bears both axial load and radial load, and is a very important component. Traditional automobile 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 performed on the automobile production line. This structure makes it difficult, costly and unreliable to assemble in automobile production plants. Moreover, when the automobile is maintained at the repair point, the bearings need to be cleaned, oiled and adjusted. The wheel hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It integrates two sets of bearings into one. It has good assembly performance, can omit clearance adjustment, is light in weight, has a compact structure, and has a large load capacity. Large, sealed bearings can be filled with grease in advance, omit external hub seals, and are maintenance-free. They have been widely used in cars, and there is also a trend of gradually expanding their application in trucks.