Tapered roller bearings belong to separable bearings, bearing inner and outer rings all have conical raceway. The bearings are divided into single row, double row and four row tapered roller bearings according to the number of rollers. Single row tapered roller bearings can withstand radial load and uniaxial axial load. When the bearing is subjected to radial load, it will produce an axial component force, so when another bearing that can bear the reverse axial force is needed to balance it. Tapered roller bearings are widely used in automobiles, rolling mills, mines, metallurgy, plastic machinery and so on. During installation and operation, axial clearance can be adjusted and pre interference installation can also be made.