The tapered roller bearings mainly bear radial and axial combined loads. The bearing bearing capacity depends on the rolling angle of the outer ring, and the larger the angle, the greater the bearing capacity. This type of bearing belongs to a separate type of bearing. According to the number of columns in the roller body in the bearing, it is divided into single, double and four-row taper roller bearings. The single-row taper roller bearing clearance needs to be adjusted by the user at the time of installation. Double-row and four-row taper roller bearing clearance has been given according to the user's requirements when the product is delivered,without user adjustments.