Pillow block bearings are actually a variant of deep groove ball bearings. The characteristic is that the outer diameter surface of its outer ring is spherical, which can be fitted into the corresponding concave spherical surface of the bearing seat to achieve alignment. Outer spherical bearings are mainly used to bear the combined radial and axial loads, which are mainly radial loads. Generally, they are not suitable to bear the axial load alone.

Purpose of pillow block bearings: The internal structure of outer spherical bearings is the same as that of deep groove ball bearings, but the inner ring of this bearing is wider than the outer ring. The outer ring has a spherical outer surface, which can be automatically aligned with the concave spherical surface of the bearing seat. It has a compact structure, easy loading and unloading, and is used for simple support. It is often used in mining, metallurgy, textiles, conveying machinery, etc.