The joint bearing is mainly composed of an outer ring and an inner ring. The inner sphere of the outer ring and the outer sphere of the inner ring form a rolling friction pair. Joint bearings are widely used in engineering hydraulic cylinders, forging machine tools, construction machinery, automation equipment, automotive shock absorbers, hydraulic machinery and other industries. Joint bearing is a spherical sliding bearing, the basic type is composed of an inner and outer ring with a spherical sliding spherical contact surface. Depending on its structure and type, it can withstand radial load, axial load, or combined load of radial and axial action simultaneously.

Because the spherical sliding contact area of joint bearings is large and the inclination Angle is large, but also because most joint bearings adopt special process treatment methods, such as surface phosphating, zinc plating, chromium plating or external sliding surface lining, inserts, spraying, etc., so there is a greater load capacity and impact resistance. And has the characteristics of corrosion resistance, wear resistance, self-aligning, good lubrication or self-lubrication without lubricating dirt pollution, even if the installation dislocation can also work normally. Therefore, joint bearings are widely used in swing motion, tilt motion and rotation motion with low speed.