Joint bearings is spherical sliding bearing, basic is by a sliding contact surface of spherical surface of the inner and outer composition. Joint bearings is mainly composed of a spherical outside of the inner ring and a sphere in the outer ring composition, can bear larger load. According to its different type and structure, can bear radial load, axial load or radial, axial and existing joint load.

General used for low speed the swing of sports, also can be in certain Angle range for sports, when axis tilt and axle case hole not bigger, concentricity can still work.
Therefore, joint bearings is widely used in the speed of the lower swing motion, tilt movement and rotation movement.