Bearing action
Its function should be support, which is literally used to support the axis, but this is only part of its function. The essence of support is to bear radial load. It can also be understood that it is used to fix the shaft. Automatic selection of fast, simple and excellent bearings. This is to fix the shaft so that it can only rotate and control its axial and radial motion. The motor cannot work without bearing. Because the shaft can move in any direction, the motor requires that the shaft can only rotate during operation. In theory, it is impossible to realize the transmission function. In addition, the bearing will 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, while most bearings must have lubricating oil. In high-speed operation, friction will not only increase energy consumption, but also easily damage the bearing. Changing sliding friction into rolling friction is one-sided, because there is something called sliding bearing.
lubrication
The lubrication purpose of rolling bearing is to reduce the internal friction and wear of bearing and prevent combustion; Extend its service life; Discharge friction heat and cooling to prevent bearing overheating and lubricating oil aging; It also has the function of preventing foreign matters from entering the bearing or preventing rust and corrosion.
Lubrication method
The lubrication methods of bearings are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, select the lubrication method suitable for the use conditions and purposes. If only lubrication is considered, the lubricity of oil lubrication shall prevail. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare 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 will not completely affect the bearing life. Too much lubrication will cause greater 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 self-sealing is to make the bearing itself into a sealing device. Such as bearing and sealing ring with dust cover. The seal takes up small space, is easy to install and disassemble, and has relatively low cost. The so-called bearing outer sealing performance device refers to the sealing device with various performances manufactured inside the installation end cover. The outer seal of the bearing is divided into non-contact seal and contact seal. The non-contact seal is suitable for high-speed and high-temperature occasions, and has different structural forms such as clearance type, labyrinth type and gasket type. The contact seal is suitable for medium and low speed working conditions. Common structural forms include felt seal, cup seal, etc
According to the requirements of bearing working conditions and working environment on sealing degree, various sealing forms are often used in engineering design to achieve better sealing effect. When selecting the bearing outer seal, the following main factors should be considered:
1.Bearing lubricant and type (grease and lubricating oil);
2.The working environment of the bearing and the size of the occupied space;
3.The advantages of the supporting structure of the shaft and the allowable angle deviation;
4.Circumferential speed of sealing surface;
5.Working temperature of bearing;
6.Manufacturing cost.
