Tapered roller bearings are separate rolling bearings with conical outer and inner raceways. This kind of bearing consists of an outer ring, an inner ring, a tapered roller and a cage. The inner ring assembly (including the inner ring, tapered roller and cage) can be separated from the outer ring to facilitate separate installation. Tapered roller bearings are divided into different structural types according to the number of rows of rollers installed, such as single row, double row and four rows. Among them, single row tapered roller bearings are the most common and are mainly used to bear radial loads and axial loads in one direction. , but when bearing radial load, an axial component force will be generated, so another bearing is needed to bear the axial force in the opposite direction to maintain balance. This kind of bearing has a large load-bearing capacity and good stability, and is widely used in automobiles, electric power, aviation and other fields, especially in situations where high-speed rotation, large loads and small deformation requirements are required.