Spherical roller bearings are bearings with drum-shaped rollers assembled between the inner ring with two raceways and the outer ring with spherical raceways. Spherical roller bearings have two rows of rollers, which mainly bear radial loads, but can also bear axial loads in any direction. It has high radial load capacity, especially suitable for working under heavy load or vibration load, but cannot bear pure axial load. The outer ring raceway of this type of bearing is spherical, so its alignment performance is good and it can compensate for the coaxiality error.