The ball bearing has two ball and the outer ring has a common concave spherical surface. Therefore, the bearing is self aligning, not affected by the shaft relative to the bearing box. It is especially suitable for applications where large shaft deflection or misalignment of the bearing can be produced. In addition, self - aligning ball bearings in all of the rolling bearings in the lowest friction, so that even in high speed can be maintained at a low temperature.
The basic design of self-aligning ball bearings with a cylindrical bore, or with a tapered bore in certain size ranges (1:12 cone).
130 and 139 series of large - scale self - aligning ball bearing was originally developed for the specific occasions of the paper mills, but also can be used for the importance of low friction than the load capacity of the occasion. The outer ring and the inner ring of the bearing have a ring groove and a few lubrication holes, and the inner ring has a lubrication hole. Some 12 and 13 series of bearing steel balls are protruding from the side of the bearing. The overall width of these bearings (included in the steel ball) is listed in the bearing table, the relevant parts of the design of the bearing configuration should be considered.