The role of bearings

(1) Support: the literal interpretation is used to support the shaft, but this is only part of its role. 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 rotate, and control its axial and radial movement. The motor can't work at all without bearings. Because the shaft may move in any direction, and the motor requires the shaft to rotate only when it is working. In theory, it is impossible to achieve the role of transmission. Not only that, bearings also affect the transmission. In order to reduce this effect, good lubrication must be achieved on the bearings of high-speed shafts. Some bearings are already lubricated, called pre-lubricated bearings, and Most bearings must have lubricating oil, which is responsible for not only increasing energy consumption due to friction during high-speed operation, but more terrible is that it is easy to damage the bearing. The conversion of sliding friction into rolling friction is one-sided, because there is something called a sliding bearing.

(2) Lubrication: The purpose of lubricating rolling bearings is to reduce internal friction and wear of bearings, prevent burning and sticking; extend their service life; discharge frictional heat and cooling, prevent overheating of bearings, prevent aging of lubricating oils themselves; also prevent foreign objects from intruding into bearings or prevent rust , The effect of corrosion.

Lubrication method

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 choose a lubrication method suitable for the conditions of use and purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication simplifies the structure around the bearing, and compares the advantages and disadvantages of grease lubrication and oil lubrication. Pay special attention to the amount when lubricating. Whether it is oil lubrication or grease lubrication, too little lubrication will not fully affect the bearing life.

(3) Seal: The seal of the bearing can be divided into two types: self-contained seal and external seal. The so-called bearing self-sealing means that the bearing itself is made into a device with sealing performance. Such as bearings with dust caps, sealing rings, etc. Such a seal takes up little space, is easy to install and disassemble, and has a relatively low cost. The so-called bearing with sealing performance device is a sealing device with various performances manufactured inside the mounting end cover and the like. Bearing plus seal is divided into non-contact seal and contact seal.

Among them, non-contact sealing 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 suitable for medium and low speed working conditions. Commonly used felt seals, leather cup seals and other structural forms.

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