The internal structure of spherical plain ball bearings is the same as that of deep groove ball bearings, but the inner ring of this type of bearing is wider than the outer ring. The outer ring has a truncated spherical outer surface, which can automatically align with the concave spherical surface of the bearing housing. Usually, there is a gap between the inner hole of this type of bearing and the shaft. The inner ring of the bearing is fixed on the shaft by a set screw, an eccentric sleeve or a tight lock sleeve and rotates along with the shaft. The mounted bearing has a compact structure, is easy to install and remove, and has a perfect seal. It is suitable for simple support and is often used in mining. Metallurgy. Agriculture. Chemical industry. Textile, printing and dyeing, conveying machinery, etc. The outer spherical surface ball imported bearing is actually a variant of the deep groove ball imported bearing. Its 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 imported bearing housing to achieve self-aligning. Although its basic performance should be similar to that of deep groove ball bearings, this type of bearing is mostly used in relatively rough machinery, where the installation is insufficient, the alignment of the shaft and the housing hole's axis is poor, or the shaft is long and has a large deflection, and the precision of the bearing itself is not high enough, and some structures are also relatively rough. Therefore, the actual performance of common energy is significantly discounted compared to deep groove ball bearings of the same specification. For instance, the spherical surface ball bearing with a set screw is applied to the through shaft with poor rigidity and large deflection. This type of bearing has sealing rings on both sides, which can strictly prevent dirt from entering. It is pre-filled with an appropriate amount of lubricant at the factory and does not require cleaning or additional lubricant before installation. When the set screw on the protruding end of the inner ring of the bearing is tightened on the shaft. The allowable axial load shall not exceed 20% of the rated dynamic load
