What are the uses of the bearings?
April 12, 2019
Bearing function
In terms of its role, it should be support, that is, literal interpretation is used for the bearing shaft, but this is only part of its function, and its essence is to be able to bear the radial load. It can also be understood that it is used to fix the shaft. Bearings are quick and easy to automate the selection. It is the fixed shaft that allows it to only rotate and control its axial and radial movement. If the motor has no bearings, it will not work at all. Because the shaft can move in any direction, and the motor requires the shaft to rotate only when it is working. In theory, it is impossible to realize the function of the transmission. In addition, the bearing will also affect the transmission. In order to reduce this effect, good lubrication must be achieved on the bearings of the high-speed shaft. Some bearings have been lubricated, called pre-lubricated bearings. Most bearings must have lubricating oil, which is responsible for not only increasing energy consumption due to friction during high-speed operation, but also horrifying is that it is easy to damage the bearing. The idea of turning sliding friction into rolling friction is one-sided because there is something called a sliding bearing.
lubricating
Lubrication of rolling bearings reduces friction and wear inside the bearing, prevents burning; prolongs its service life; discharges friction heat and cooling, prevents bearing overheating, prevents aging of lubricating oil itself, and prevents foreign matter from intruding into the bearing or preventing rust and corrosion. The effect.
Lubrication method
The lubrication method of the bearing is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing and comparing the advantages and disadvantages of grease lubrication and oil lubrication. Pay special attention to the amount of lubrication, whether it is oil lubrication or grease lubrication, too little lubrication does not fully affect the bearing life, too much amount will produce large resistance, affecting the speed.
seal
Bearing seals can be divided into self-contained seals and external seals. The so-called bearing self-contained seal is to manufacture the bearing itself into a device with sealing performance. Such as bearings with dust cover, sealing ring and so on. The sealing space is small, the installation and disassembly are convenient, and the cost is relatively low. The so-called bearing-inserted sealing performance device is a sealing device having various properties manufactured inside a mounting end cap or the like. Bearings and seals are divided into non-contact seals and contact seals. Among them, the non-contact seal is suitable for high speed and high temperature applications, and has different structure forms such as gap type, labyrinth and washer type. Contact seals are suitable for medium and low speed working conditions, and are commonly used in the form of felt seals and cup seals.
According to the working conditions of the bearing and the working environment, the sealing degree is often used in engineering design to achieve a better sealing effect. The choice of bearing seals should consider the following main factors:
1. Bearing lubricant and type (grease and lubricating oil);
2, the working environment of the bearing, the size of the occupied space;
3, the support structure of the shaft has the advantage of allowing angular deviation;
4. The circumferential speed of the sealing surface;
5, the working temperature of the bearing;
6. Manufacturing costs.
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