Structure of the joint bearing is simpler than the rolling bearing, which is mainly composed of a spherical outside surface of the inner ring and the outer ring of a spherical in the competition. Joint bearing is generally used for swinging movement of lower speed(i.e.angular motion), due to the sliding surface is a spherical surface shape, and can also be used as a tilting movement in a certain angle range (i.e. aligning motion),the support shaft and shaft shell hole not concentricity is larger, can still work normally.