Spherical roller bearings have two rows of spherical rollers, the outer ring has a common concave spherical raceway, the inner ring has two concave raceway inclined at an angle to the bearing axis, and the curvature center of the outer ring raceway is consistent with the bearing center. Spherical roller bearings are self-aligning and are not affected by misalignment between the shaft and the bearing housing or shaft deformation and deflection, and can compensate for the resulting concentricity errors. In addition to bearing radial loads, this type of bearing can also bear bidirectional axial loads and their combined loads. It has a large bearing capacity and has good vibration and impact resistance. Spherical roller bearings are mainly used in various mechanical equipment in the steel, mining, papermaking, shipbuilding, textile machinery, coal mills, electric power and other industries. They are the * widely used type of bearings in the machinery industry.