Taper roller bearings can be separated by inner circle, roller, keep frame together components and outer ring could separately installed. Roller and groove in the fixed line can reduce stress concentration. Taper roller bearings can withstand the big radial direction load and the axial load. Due to the circular cone roller bearings can only transfer one-way axial load, therefore, to transfer the opposite direction of the axial load will need another with the installation of symmetric circular cone roller bearings. Tapered roller bearings is the largest amount of single circular cone roller bearings. The front wheel hub in cars, in recent years is also played by the small size of the double row circular cone roller bearings. Four row circular cone roller bearings used in large cold, other heavy machine