Tapered roller bearings, the outer ring with a tapered roller, with tapered roller Road roller, tapered roller bearings with the main city in order to bear the main burden of radial radial, axial joint load. Bearing components within the outer ring and can be separated to facilitate the installation and dismantling. Bearing the axial bearing capacity of the decision by the contact angle α, α greater the angle, the greater the axial bearing capacity. Bearing such widely used in automotive, transmission, the machine tool spindle, construction machinery, vehicles and railway rolling mill roll neck.