Joint bearing is a spherical sliding bearing, its sliding contact surface is an inner spherical surface and an outer spherical surface, the movement can be rotated at any angle swing, it uses the surface phosphating, fried mouth, inlay pad, spraying and other special process treatment methods to produce.

Joint bearing spherical sliding contact area is large, tilt angle is large, but also because most of the joint bearing to take a special process disposal methods, such as the appearance of phosphating, galvanizing, chrome plating or outer sliding surface lining, pad, spraying, etc., so there is a greater load capacity and impact resistance, and has corrosion resistance, wear resistance, self-aligning, good smooth or self-smooth no smooth dirt purification characteristics, even if the device misalignment can Normal task. As a result, spherical plain bearings are commonly used for low-speed oscillating, tilting and rotating movements.

In any case, the fit chosen for the spherical plain bearing must not cause uneven deformation of the collar, and the nature and grade of the fit must be selected according to the type of bearing, the form of support and the size of the load and other working conditions.

When the applied load and the speed generated by the oscillating motion are small, oil-fed spherical bearings can be operated without lubrication. Nevertheless, regular grease replenishment is normally required. For initial installation and operation, it is recommended that the lubrication intervals be reduced slightly.

 Oil-free spherical plain bearings can be used without lubrication. However, the service life of a spherical plain bearing can be extended if lithium soap-based grease is added prior to operation. If the space around the bearing is filled with grease, the spherical plain bearing will be more effective in protecting against dust and foreign objects.