Spherical roller bearings have two rows of rollers with a common concave sphered raceway in the outer ring and two inner ring raceways inclined
at an angle to the bearing axis. The center of curvature of the out ring raceway is identical to the center of shaft. These bearings are self-aligning, and are unacted on the misalignment or
deflection which will cause the concentricity errors. These bearings can accommodate not only radial loads but also axial load in double dirction and the combined loads. They have large load carrying
capacity and also good abilty of anti-vibration and impact resistance. Spherical roller bearings are mainly used in the mechanical equipment of all kinds of industries, such as steel, mine,
papermaking, shipping, textile machinery, coal mill, electricity and so on . So to say, spherical roller bearings are used most widely in the engeering industry.