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The development of the machinery industry is very rapid, and now, as our metal products, more and more high-quality technology, mechanical performance will be better, do not look at this small self-lubricating bearings parts, but they in large machinery To a very important role. The advantages of plain bearings is simple, large contact area, smooth and reliable, no noise. In the liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, can greatly reduce the friction loss and surface wear, the other film also has a certain vibration absorption capacity. The disadvantage of sliding bearings is unable to maintain sufficient reserves of lubricating oil, and start a larger friction. Self-lubricating bearings can lead to the normal operation of large machinery, without these products, our machinery will not work properly, so its good maintenance, to make our mechanical life longer.