Spherical roller bearings are used to bear radial load, but also can withstand a certain amount of axial load, but generally can not bear the pure axial load. This kind of bearing outer ring raceway, spherical shape, the former residence of a self-aligning properties, when the shaft to bend or tilt stand by leaving the center line of the inner and outer ring relative to the center line of slope less than 0.5 ° ~ 2 °, the bearing can still be work. Principles and characteristics of its structure and the self-aligning ball bearing the same, the only difference is that the rolling body is a spherical roller, due to the different rolling, so it's a larger carrying capacity, widely used in mining and heavy machinery. Bearing such limit axial displacement of shaft or housing of the axial clearance in the bearing range. Spherical roller bearings and aligning ball bearings, speed limits in line with capacity and circumstances permit, can be mutually substituted