In terms of bearing function, it should be used for support, which literally means 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 automatic selection of quick and easy bearings is included. It is to fix the shaft so that it can only rotate, while controlling its axial and radial movement. If the motor does not have bearings, it cannot work at all. Because the shaft can move in any direction, and the motor requires the shaft to only rotate during operation. In theory, it is impossible to achieve the function of transmission. Moreover, bearings can also affect transmission. In order to reduce this effect, 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, which is responsible for not only increasing energy consumption due to friction during high-speed operation, but also easily damaging the bearings. The notion of converting sliding friction into rolling friction is one-sided, as there is something called sliding bearings.

lubrication

The lubrication purpose of rolling bearings is to reduce internal friction and wear, and prevent burning and sticking; Extend its service life; Eliminate frictional heat and cooling, prevent bearing overheating, and prevent lubricating oil from aging on its own; It also has the effect of preventing foreign objects from entering the interior of the bearing, or preventing rust and corrosion.

Lubrication method

The lubrication methods for bearings are divided into grease lubrication and oil lubrication. In order for bearings to function well, the first step is to choose a lubrication method that is suitable for the usage conditions and purposes. If only lubrication is considered, the lubricity of oil lubrication has the advantage. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication. Special attention should be paid to the amount of lubrication, whether it is oil lubrication or grease lubrication. Insufficient lubrication with too little amount will affect the bearing life, while too much amount 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 built-in sealing 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 properties manufactured inside the installation end cover and other components. The external sealing of bearings is 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 gap type, labyrinth type, and gasket type. Contact seals are suitable for medium and low-speed working conditions, and commonly used structural forms include felt seals, cup seals, etc.

According to the working conditions and environment of bearings, various sealing forms are often comprehensively used in engineering design to achieve better sealing effects. The selection of external seals for bearings should consider the following main factors:

1、Bearing lubricants and types (grease and oil);

2、The working environment of bearings and the size of the occupied space;

3、Advantages of the supporting structure of the shaft, allowing for angular deviation;

4、The circumferential velocity of the sealing surface;

5、The working temperature of the bearing;

6、Manufacturing cost.