Bearings are an important part of contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy.

In terms of its function, it should be a support, that is, it is used to support the shaft literally, but this is only part of its function. The essence of support is to be able to bear radial loads. It can also be understood that it is used to fix the shaft. Bearing quick and easy automatic selection is included. It is to fix the shaft so that it can only achieve rotation, while controlling its axial and radial movement. A motor won't work at all without bearings. Because the shaft may move in any direction, and the motor is required to only rotate when it is working.

Bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. The advantages and disadvantages of grease lubrication and oil lubrication are compared. When lubricating, special attention should be paid to the amount used. Whether it is oil lubrication or grease lubrication, too little amount of lubrication will not fully affect the bearing life, and too much amount will produce large resistance and affect the speed.

Bearing seals can be divided into two types: built-in seals and external seals. The so-called self-sealing of the bearing is to manufacture the bearing itself as a device with sealing performance. Such as bearings with dust cover, sealing ring and so on. This kind of sealing takes up little space, is easy to install and disassemble, and is relatively low in cost. The so-called bearing plus sealing performance device is a sealing device with various performances manufactured inside the mounting end cover and the like. Bearing seals are divided into two types: non-contact seals and contact seals. Among them, the non-contact seal is suitable for high-speed and high-temperature occasions, and has different structural forms such as gap type, labyrinth type and gasket type. The contact seal is perfect for the medium as well as low-speed working conditions. There are commonly utilized structural kinds, such as really felt seals and leather bowl seals.