Self-aligning roller bearing has two rows of rollers, which mainly bear radial load and can also bear axial load in any direction. It has high radial load capacity, especially suitable for working under heavy load or vibration load, but can not bear pure axial load. The outer ring raceway of this type of bearing is spherical, so its centering performance is good and can compensate the coaxiality error.

There are two rows of symmetrical spherical rollers, the outer ring has a common spherical raceway, and the inner ring has two raceways inclined at a certain angle with the bearing axis, which has good centering performance. When the shaft is bent or installed concentrically, the bearing can still be used normally. Centering performance varies with bearing size series. Generally, the allowable centering angle is 1~2.5 degrees. This type of bearing has a large bearing capacity. In addition to bearing radial load, it can also bear two-way axial load, and has good impact resistance. Generally speaking, the allowable working speed of self-aligning roller bearing is low.