(1) Similar to the self-aligning ball bearing, the outer race raceway of the self-aligning roller bearing is a part of the spherical surface, and its curvature center is on the bearing axis. The outer race raceway of this type of bearing is spherical, so its self-aligning performance is good, and it can compensate the coaxiality error, so it can achieve automatic centering.
(2) In the section perpendicular to the rolling direction, the roller generatrix is a curve, which can be well matched with the inner and outer raceways. The roller is in line contact with the raceway, which can withstand radial and axial loads, and has good impact resistance.
(3) The alignment between the roller and raceway of self-aligning roller bearing is high, and both are curve generatrix. Therefore, the relative sliding is serious, and the friction is greater than that of cylindrical roller bearing. Therefore, the allowable working speed of self-aligning roller bearing is lower.
(4) The common self-aligning roller bearing has an asymmetric roller, which will generate an axial force component during operation. The roller is in contact with the central fixed rib under the effect of this force component. The self-aligning roller bearing of symmetric roller uses an axially movable intermediate retainer ring, so that the roller is no longer constrained by the central rib, and the undercut groove of the inner ring raceway is omitted. Longer rollers can be used, Thus, the bearing capacity is improved.
(5) The contact angle of single row self-aligning roller bearing is 0., Under the axial load, the contact angle does not change significantly, and a small axial load will generate a large contact force between the roller and the raceway. Therefore, when the axial load is relatively greater than the radial load, the single row self-aligning roller bearing cannot bear the combined radial and axial load.
(6) Similar to the self-aligning ball bearing, the double row self-aligning roller bearing with a locking sleeve can be installed on any position of the smooth shaft, without machining the locating shoulder.
