1、According to joint bearing''s structure and the different types can bear radial load, axial load, or radial, axial load at the same time the role of the joint. The spherical bearing joints due to sliding contact area, angle of inclination, but also because most of the bearing joints have taken a special treatment process, such as surface phosphide, zinc, chrome or outside the sliding surface lining, the pad set, spraying, and so on. 2、joint bearing are widely used in hydraulic engineering, metal forming machine tools, engineering machinery, automation equipment, automobile shock absorber, water and machinery industries. Joints bearing and the breakdown of the joint briefing is a spherical bearing sliding bearings, from the basic type with spherical ball sliding Contact with the surface, the composition of the outer ring.