The main function of the hub bearing is to carry weight and accurately guide the wheel rotation. The conventional structure of automobile wheel bearings is composed of two groups of tapered bearings or spherical bearings. The bearings are installed, lubricated, sealed and play adjusted. Due to the existence of this structure, it is difficult to assemble, high in cost and poor in reliability, and must be cleaned, lubricated and adjusted during maintenance. This product is characterized by assembly, elimination of clearance adjustment, light weight, compact structure, large load capacity, pre gr