Taper roller bearings mainly accommodate combined redial and axial load with redial load being the main one. Its load capacity is determined by its contact angle, the bigger the angle is, the bigger the load capacity. It is separable type of bearing. According to the number of rows of the rollers, it can be categorized into single row, double row, four row taper roller bearings. Clearance of single row type is adjusted while mounting by the user. Clearance of double row and four row is set according to the user's requirement during production users can not adjust.