Spherical plain bearing is a type of spherical sliding bearing, with a sliding contact surface consisting of an inner spherical surface and an outer spherical surface. It can rotate and swing at any angle during motion. It is made using various special processing methods such as surface phosphating, blasting, gasket insertion, and spraying. Joint bearings have the characteristics of high load capacity, impact resistance, corrosion resistance, wear resistance, self centering, and good lubrication