The outer spherical bearing is actually a variant of deep groove ball bearings, is characterized by its outer diameter surface of the sphere, can be blended with a corresponding concave spherical bearing plays the role of the heart. Although the basic performance and deep groove ball bearing it should be similar, but because most of the bearings used in the rough machinery, installation and positioning is not accurate enough, the axis of shaft and hole of the neutral difference, or axial length and deflection etc, and the precision of the bearing itself is not high enough, some structure is relatively rough, so the performance of deep groove ball bearings of the same size to play on a discount. For example: the outer spherical ball bearings with top wire is applied to the large deflection of the stiffness difference, the two sides of the bearing with the sealing ring, can closely prevent dirt intrusion, the factory has been filled