Spherical roller bearings 21300 series, whose inner rings have two raceways, and outer race-ways are spherical. The centers of curvature of outer raceways are also the bearing centers. The bearings possess self-aligning performance, the permissible disalignment angle is about 1-2.5°, and they can be used in certain permanent deflective application.

These bearings are able to carry high radial loads, as well as axial loads at the same time, but not pure axial loads, the axial carrying bearing will be needed if axial loads were higher. The contact between rollers and raceways are so close, so the friction is higher than cylindrical roller bearings, and their limiting speed is lower.

Spherical roller bearings are available in the cylindrical inner bore and conical inner bore. The taper of the conical inner bore is 1:12 rear spherical roller bearing with code K and 1:30 rear spherical roller bearing code K30. When such a bearing is matched with a conical shaft, the inner ring moves axially to adjust the radial clearance of the bearing. The tapered roller spherical roller bearings with the rear code K and K30 are mounted on the matching adapter sleeves, which become the rear bearing code K+H and K30+H bearings. This type of bearing can be mounted on an optical axis without a shoulder and is suitable for applications where the bearing needs to be installed and removed frequently.

Application

Spherical roller bearings are primarily used in such application as rolling mills, paper making machines,power-driven gears, reduction gears, railway vehicle axles, crushers, woodworking machinery, shipping and so on.