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What is plain bearing

2021-05-27 10:44:03
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Sliding bearing is the bearing operating under sliding conflict. Sliding bearing operation is smooth, reliable and noiseless. Under the condition of smooth liquid, the sliding surface is separated by smooth oil without direct touch, which can greatly reduce conflict loss and surface wear, and the oil film also has certain vibration absorption ability. But the resistance of starting conflict is large. The part of the shaft supported by the bearing is called the journal, and the parts matching the journal are called the bushing. A layer of antifriction material cast on the inner surface of the bearing bush in order to improve its conflict properties is called bearing lining. The materials of bearing bush and bearing lining are collectively referred to as sliding bearing materials. Sliding bearings are generally used in low speed and heavy load conditions, which may be difficult to protect, maintain and fill smooth oil.

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  China is one of the countries that invented rolling bearing earlier in the world. In ancient Chinese books, the structure of axle bearing has long been recorded. From the perspective of archaeological relics and materials, the oldest bearing with the prototype of modern rolling bearing structure appeared in The present Xuejiaya village of Yongji County, Shanxi Province in 221-207 BC (Qin Dynasty). After the establishment of new China, especially since the 1970s, under the strong impetus of reform and opening up, the bearing industry has entered a new period of high quality and rapid development. At the end of the 17th century, Ball bearings were designed and manufactured by C. Warlow in England, and were put on trial on mail wagons, and P. Worth patented ball bearings. At the end of the 18th century, H.R. Hertz of Germany published a paper on the touch stress of ball bearings. On the basis of Hertz's achievements, R. Strobek of Germany, A. Palmgren of Sweden and others carried out A large number of experiments, and made contributions to the development of rolling bearing design theory and fatigue life calculation. Later, N.P. Petrov of Russia applied Newton's law of viscosity to calculate bearing conflicts. The British O. Reynolds made a mathematical analysis of Tor's discovery and derived The Reynolds equation, which laid the foundation for the smooth theory of fluid dynamic pressure. The form of linear bearing in the early stage is a row of wooden poles placed under the skid plate. This skill probably dates back to the construction of the Great Pyramid of Giza, although there is no clear evidence for it. Modern linear bearings use the same operating principle, but sometimes the ball instead of roller. The earliest sliding and rolling bearings were made of wood. Ceramic, sapphire and perhaps glass are also used, steel, copper, other metals, and plastics (such as nylon, formic, teflon and UHMWPE) are commonly used.


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