Bearing action
In terms of its function, it should be a support, which is literally used to support the shaft, but this is only a part of its function. The essence of support is to be able to bear radial loads. It can also be understood as being used to fix the shaft. The selection of bearings for quick and easy automation is included. It is to fix the shaft so that it can only rotate and control its axial and radial movement. If the motor does not have bearings, it cannot work at all. Because the shaft may move in any direction, and the motor requires the shaft to only rotate during operation. In theory, it is impossible to achieve the effect of transmission. Moreover, bearings can also affect the transmission. In order to reduce this impact, good lubrication must be achieved on the bearings of high-speed shafts. Some bearings already have lubrication, called pre lubricated bearings, while most bearings must have lubricating oil. During high-speed operation, friction not only increases energy consumption, but also makes it easy to damage the bearings. It is one-sided to turn sliding friction into rolling friction, because there is something called sliding bearing.
lubrication
The lubrication purpose of rolling bearings is to reduce internal friction and wear of bearings and prevent burning and sticking; Extend its service life; Discharging frictional heat, cooling, preventing bearing overheating, and preventing lubricating oil from aging itself; It also has the effect of preventing foreign objects from entering the interior of bearings, or preventing rust and corrosion.
Lubrication method
The lubrication methods for bearings are divided into grease lubrication and oil lubrication. In order to make the bearings function well, first of all, it is necessary to choose a lubrication method that is suitable for the conditions and purpose of use. If only lubrication is considered, the lubricity of oil lubrication is advantageous. However, grease lubrication has the advantage of simplifying the surrounding structure of bearings, comparing the advantages and disadvantages of grease lubrication and oil lubrication. When lubricating, special attention should be paid to the amount used, whether it is oil lubrication or grease lubrication. If the amount is too little, insufficient lubrication will affect the bearing life. If the amount is too much, it will generate large resistance and affect the speed.
seal up
The sealing of bearings can be divided into two types: self sealing and external sealing. The so-called bearing with its own seal refers to manufacturing the bearing itself into a device with sealing performance. Such as bearings with dust covers, sealing rings, etc. This type of seal takes up very little space, is easy to install and disassemble, and has a relatively low cost. The so-called bearing external sealing performance device refers to a sealing device with various performance manufactured inside the installation end cover, etc. The external sealing of bearings can be divided into two types: non-contact sealing and contact sealing. Non contact sealing is suitable for high-speed and high-temperature applications, with different structural forms such as clearance type, labyrinth type, and gasket type. Contact sealing is suitable for medium to low speed working conditions, and commonly used structural forms include felt sealing, leather cup sealing, etc.
According to the requirements of bearing working conditions and working environment for sealing degree, various sealing forms are often comprehensively used in engineering design to achieve better sealing effect. The selection of external sealing for bearings should consider the following main factors:
1. Bearing lubricants and types (lubricating grease and oil);
2. The working environment of the bearing and the size of the occupied space;
3. Advantages of the supporting structure of the shaft, allowing for angle deviation;
4. The circumferential velocity of the sealing surface;
5. The working temperature of the bearing;
6. Manufacturing costs
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