As we all know, bearings are components that fix and reduce the load friction coefficient during mechanical transmission. So what is a sliding bearing?

Sliding bearings are bearings that work under sliding friction. Slide bearings work smoothly, reliably and without noise. Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, and friction loss and surface wear can be greatly reduced. The oil film also has a certain ability to absorb vibration of the sliding bearing copper alloy sleeve. However, the starting frictional resistance is large. The part where the shaft is supported by the bearing is called the journal, and the part that matches the journal is called the bearing. The friction-reducing material layer cast on its inner surface to improve the frictional properties of the pad surface is called a bearing lining. Bearing pad and bearing material are collectively referred to as the plain bearing material. Sliding bearing applications are generally under low-speed and heavy-duty conditions, or bronze-hole bearings are difficult to maintain and refill lubrication.

China is one of the countries in the world that earlier invented rolling bearings. In the Chinese ancient book of brass bushings, the structure of axle bearings has been documented for a long time. Judging from the archaeological relics and materials, the oldest bearings of modern rolling bearing structures in China appeared in Xuejiaya Village, Yongji County, Shanxi Province, from 221 to 207 BC (Qin Dynasty). Since the founding of New China, especially since the 1970s, under the strong push of reform and opening up, the bearing industry has entered a new era of high quality and rapid development. At the end of the 17th century, C. Vallo of the United Kingdom designed and manufactured ball bearings, installed them on a postal train, and patented P. Worth of the United Kingdom to obtain ball bearings. At the end of the eighteenth century, Germany's H.R. Hertz published a paper on ball bearing contact stress. Based on the achievements of Hertz, R. Stiebeck of Germany and A. Pamgren of Sweden conducted extensive tests and contributed to the development of the design theory and fatigue life calculation of rolling bearings. Subsequently, Russia's N.P. Petrov applied Newton's law of viscosity to calculate bearing friction. O. Reynolds of the United Kingdom conducted a mathematical analysis of Thor's findings and derived the Reynolds equation, which laid the foundation for the hydrodynamic lubrication theory. The early form of linear motion bearing was a row of wooden poles placed under the seesaw. This technology may be traced back to the construction of the Great Pyramid of Giza, although there is no clear evidence. Modern linear motion bearings use the same principle of operation, except that balls are sometimes used instead of rollers. The earliest sliding and rolling body bearings were wooden. Ceramics, sapphire, or glass are also used. Steel, copper, other metals, plastics (such as nylon, bakelite, Teflon, and UHMWPE) are commonly used.

In terms of its role, it should be supportive, that is, the literal interpretation is used to support the axis, but this is only part of its role, and its support is to be able to bear the radial load. It can also be understood that it is used to fix the shaft. It is the fixed shaft that allows it to rotate only and control its axial and radial movement. The consequence of having no bearing on the motor is that it cannot work at all. Because the shaft may move in any direction, the motor requires the shaft to only rotate when it is working. Theoretically speaking, it is impossible to achieve the role of transmission, not only that, the bearing will also affect the transmission, in order to reduce the impact of high-speed shaft bearings must achieve good lubrication, and some bearings have lubrication, called pre-lubricated bearings, and Most bearings must have lubricating oil. When the load is running at a high speed, friction will not only increase energy consumption, but more frighteningly it will easily damage the bearing. The argument for turning sliding friction into rolling friction is one-sided because there is something called a sliding bearing.