The joint bearing is lubricated and self-lubricating. The joint bearing is a special type of plain bearing. Its structure is simpler than rolling bearings. It is mainly composed of an outer ring with an inner spherical surface and can withstand large loads. It can withstand radial loads according to the inner ring with outer spherical surface and its different type and structure. Combined load in axial load or in both radial and axial directions. Generally used for low-speed oscillating motion (ie, angular transport, tilting motion within a certain range of angles (ie, aligning motion), because the sliding surface is spherical), the center of the bearing shaft and the shaft hole are not different. When it is large, it still works.