The self-aligning roller bearing has double row rollers, one common spherical raceway in the outer ring and two raceways in the inner ring, which are inclined to an angle relative to the bearing axis. This ingenious structure makes it self-aligning, so it is not easy to be affected by the angle between the shaft and the bearing housing seat or the shaft bending. It is suitable for the occasion where the angle error is caused by installation error or shaft deflection. The bearing can not only bear radial load, but also bear axial load acting on both sides.

The inner holes of self-aligning roller bearings are cylindrical and conical, and the taper of conical holes is 1:30 and 1:12. This kind of bearing can be easily and quickly assembled on the smooth shaft or the shaft of a stepped machine if it is equipped with a tightening sleeve or a withdrawal sleeve.