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Application of bearings.


1. Bearing function

It is function should be support, that is, literally to bear the shaft, but this is only part of its function, the essence of support is to be able to bear radial loads. You can also think of it as holding the axis in place. Automatic selection of bearings is included. Is to fix the axis so that it can only achieve rotation, and control its axial and radial movement. 

The motor will not work at all without bearings. Because the shaft may move in any direction, and the motor operation requires that the shaft can only be rotated. In theory, it is impossible to achieve the role of transmission, not only that, bearings will also affect the transmission, in order to reduce this impact on the bearing of the high-speed shaft must achieve good lubrication, some bearings themselves have lubrication, called prelubricated bearings, and most bearings must have lubricating oil, responsible for high-speed operation, due to friction will not only increase energy consumption, What is more terrible is that it is easy to damage the bearing. The idea of turning sliding friction into rolling friction is one-sided, because there is such a thing as plain bearings.


The lubrication of rolling bearings can reduce internal friction and wear of bearings and prevent burning and sticking; Extend its service life; Discharge friction heat, cooling, prevent bearing overheating, prevent lubricating oil itself aging; It also has the effect of preventing foreign matter from intruding into the bearing, or preventing rust and corrosion.

3.Lubrication method

Bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, we should choose the lubrication method suitable for the use conditions and the use purpose. If only lubrication is considered, the lubrication of oil lubrication is dominant. However, grease lubrication can simplify the structure around the bearing, the advantages and disadvantages of grease lubrication and oil lubrication are compared. Special attention should be paid to the amount of lubrication, whether it is oil lubrication or grease lubrication, too little lubrication is not enough to affect the bearing life, too much will produce large resistance, affect the speed.


The sealing of bearings can be divided into two categories: built-in sealing and external sealing. The so-called bearing seal is to manufacture the bearing itself into a device with sealing performance. Such as bearing with dust cover, sealing ring, etc. This seal occupies a small space, convenient installation and disassembly, and the cost is relatively low. 

The so-called bearing external sealing performance device is a sealing device with various performance manufactured inside the installation end cover. Bearing external seal is divided into two types: non-contact seal and contact seal. The non-contact seal is suitable for high speed and high temperature occasions, with different structural forms such as clearance type, labyrinth type and gasket type. Contact seal is suitable for medium and low speed working conditions, commonly used felt seal, bowl seal and other structural forms.

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