The inner ring of this type of bearing has two raceways and the outer ring has a single spherical raceway with its centre of curvature coincident with the bearing axis. Therefore, the axis of the inner ring, balls and cage can deflect to some extent around the bearing centre. Consequently, minor angular misalignment of the shaft and housing caused by machining or mounting error is automatically corrected. Generally self-aligned ball bearing often has a tapered bore for mounting using an adapter sleeve.
It is particularly suitable for applications where considerable shaft deflections or misalignment is to be expected. Additionally, the self-aligning ball bearings have the lowest friction of all rolling bearings, which enables it to run cooler even at high speeds.
The self-aligning ball bearings are widely used in,