The main function of the wheel hub bearing is to bear load and provide precise guidance for the rotation of the wheel 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 assembly difficult, costly, and unreliable in automobile production plants. Moreover, when the automobile is maintained at a repair point, the bearings need to be cleaned, oiled, and adjusted.