Spherical plain bearing is a sliding bearing with special structure. Its structure is easier than that of rolling bearings. It is mainly composed of a spherical inner ring and a spherical outer ring and can carry heavier loads. It can carry radial loads axial loads or combined radial and axial loads which exist at the same time acc. To its different types and structures. It is generally used for swing motion at lower speed. Due to the spherical form of sliding surface. It can also do skew motion (algning motion)within a certain scope of angles and can still operate normally when the supporting shaft is eccentric with the shaft aperture.
As per the direction of load which the spherical plain bearings can carry, nominal contact angles and structural form, it can be classified as deep groove spherical plain bearings, angular contact spherical plain bearings, thrust spherical plain bearings and rod end bearings.