Self-aligning roller bearing, also called spherical roller bearing, has double-row rollers, its outer ring has a common spherical raceway, and the inner ring has two paratactic raceways, and is inclined at an angle relative to the bearing axis. This ingenious structure makes it self-aligning, therefore, it is not easily affected by the angle between the shaft and the bearing housing to the error or bending of the shaft. It can allow some tilt of the shaft during the installation. Besides, self-aligning roller bearings can be used in extremely heavy loads, allowing higher speeds. In addition to bearing radial loads, these bearings can also bear considerable axial loads.
Self-aligning roller bearing has a cylindrical or a conical inner bore, for the conical one, normally its bore has a taper ratio of 1:12 or 1:30. The conical inner bore type bearings are generally matched with adapter sleeves or withdrawal sleeves, which can easily and quickly assemble tapered inner bore self-aligning ball bearings on the round shafts or stepper shafts.
Self-aligning roller bearings are mainly used in papermaking machinery, rolling mills, crushers, printing machinery, woodworking machinery, and various industrial reducers.