Self aligning ball bearing has two rows of balls and a Globoidal raceway in the outer ring. Therefore,the bearing can be automatically aligned and can withstand the angle error between the shaft and the bearing seat.It is especially suitable for the cases where axle deflection and misalignment are prone to occur. In addition,the friction of self-aligning ball bearings is the lowest among all rolling bearings, making it have only a small temperature rise even at high speed.The track surface of the outer wheel of the self-aligning ball bearing is spherical, and the inner wheel and the steel ball can incline freely to the outer wheel.