Joint bearing can bear larger load. According to the different types and structure, can bear radial load, axial load or the joint of the radial, axial load. Because the inside is outside the sphere with composite material, so the bearing can produce self-lubrication at work. Oscillating motion is generally used in low speed, and  low speed rotation, can also be tilted movement within a certain Angle, when the supporting shaft and shaft shell hole concentricity is bigger, can still work normally. Self-lubricating bearing joints used in water conservancy, professional machinery and other industries.