The structure of the joint bearing is simpler than that of the rolling bearing. It consists mainly of an inner ring with an outer sphere and an outer ring with an inner sphere. Joint bearings are generally used for low-speed swing motion (angular motion). Since the sliding surface is spherical, it can also be inclined in a certain angle range (i.e. aligning motion), and it can still work normally when the support shaft and the shaft shell hole are not centralized.
Joint bearing is widely used in engineering hydraulic cylinder, forging machine tool, engineering machinery, automation equipment, automobile shock absorber, hydraulic machinery and other industries. Joint bearing is spherical sliding bearing. The basic type is composed of inner and outer rings with spherical sliding spherical contact surface. According to its structure and type, it can bear the radial load, the axial load, or the combined load of the radial and the axial loads.
Because the spherical sliding contact area of the joint bearing is large and the inclination angle is large, at the same time, because most of the joint bearings adopt special processing methods, such as surface phosphating, galvanizing, chromium plating or outer sliding surface lining, padding, spraying and so on, they have greater load capacity and impact resistance, and have anti-corrosion, wear resistance, self-aligning, good lubrication or self-lubrication without lubrication stain. The characteristics of material pollution can work normally even if the installation is dislocated. Therefore, joint bearings are widely used in low speed swing motion, tilt motion and rotation motion.