With the progress and development of society, mechanization has been widely used in production and life. As an indispensable part of machinery, bearings will be used more and more widely, because bearings are used wherever there is rotation.

Bearings are mainly used to support and reduce friction in machinery, so the accuracy and noise of bearings are directly related to the service and life of machinery. However, business personnel often encounter some customers whose efficiency is not high even if they use the best bearings or imported bearings, which is related to the use and selection of bearings. Some people may say that the use and selection of bearings is the user's business, I only care what the user wants and what I sell. However, as a qualified salesperson, in addition to being proficient in their own product knowledge, they must also be proficient in the use of products, that is, doctor-type sales, and choose the best supporting bearing according to the performance and use conditions of the user's supporting products. This is the specialized manufacturing and sales popular in the world's major companies, and this method has also achieved good results since the implementation of the People's Group.

Because of the wide range of bearing types, the following will mainly analyze the use and selection of the most widely used deep groove ball bearings. I hope that people who know less about bearings can deepen their understanding of bearings.

1. Bearing selection

1. Bearing model selection: The bearing model is generally selected by the user's technical staff according to the use conditions and load of the supporting products. The business personnel mainly understand whether the actual load of the user is in line with the selected bearing. If the bearing fails to meet the use requirements, the customer should be advised to change the model as soon as possible, but unless there is a special product, there is generally no problem in the selection of the model.

2. Selection of bearing clearance: When purchasing a bearing, users generally only tell what type and grade they are in, and rarely put forward requirements for bearing clearance. Business personnel must ask about the conditions of use of the bearing. , Among them, the bearing speed, temperature and matching tolerance are directly related to the selection of bearing clearance. Generally, motors with a speed below 3500 rpm mostly use CM clearance, such as high-temperature high-speed motors, which require relatively large clearance. After assembly, the bearing clearance will be reduced due to the expansion of the inner hole and the reduction of the outer circle. The reduction of the clearance u003d the amount of interference × 60% (except the bearing chamber is aluminum). For example, the clearance of the bearing before assembly is 0.01mm, and the interference during assembly is 0.01mm, then the clearance of the bearing after assembly is 0.004mm. Theoretically, the noise and life of the bearing will reach the best state when the clearance is zero, but in actual operation, considering the temperature rise and other issues, the clearance of the bearing after assembly is 0.002mm-0.004mm.

3. Selection of grease: The selection of grease is generally based on the bearing speed, temperature resistance, noise requirements and starting torque, etc. The business personnel are required to have a good understanding of the performance of various greases.

4. Selection of bearing seal type: The lubrication of bearings can be divided into oil lubrication and grease lubrication. Oil-lubricated bearings generally use formal bearings, and grease-lubricated bearings are generally sealed with dust caps or rubber seals. The dust cover is suitable for high temperature or good use environment. The seals are divided into two types: contact seal and non-contact seal. The contact seal has good dustproof performance but large starting torque, and the non-contact seal has small starting torque, but the sealing performance No contact is good.

Renben bearings have been professionally manufactured in automobile motor bearings, home appliance motor bearings, motorcycle bearings, health care motor bearings and other industries, so that the noise and life of the bearings can reach the best state.

Second, matters needing attention when using the bearing

1. Selection and control of the tolerance of the shaft and the bearing chamber: After the bearing is pressed into the bearing, it should rotate flexibly without any sense of blockage. If the rotation is obviously inflexible, it indicates that the size of the shaft is too large and the tolerance should be reduced. If the bearing is pressed into the shaft and rotated by hand, there is a clear rustling feeling, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of the shaft and the bearing chamber, it is necessary to control the roundness. At present, many domestic manufacturers only control the tolerance and do not control the roundness.

2. Bearing assembly method: Because the bearing is a high-precision product, improper assembly can easily cause damage to the bearing channel, resulting in bearing damage. The bearing should have a special mold when assembling, and it cannot be beaten at will. When pressing into the shaft, only a small circle can be stressed, and when a large circle is pressed, only a large circle can be stressed. When assembling, it is required to use air pressure or hydraulic pressure. When pressing, the upper and lower molds should be outside the horizontal state. If it is inclined, the bearing channel will be damaged due to force, which will cause the bearing to generate noise.

3. Prevention of foreign objects in assembly: When the bearing is installed on the rotor for dynamic balancing, it is easy for the iron filings generated during dynamic balancing to enter the inside of the bearing, so it is best to do dynamic balancing before installing the bearing. For the convenience of assembly, some manufacturers apply some oil or grease to the bearing chamber for lubricating effect during assembly, but it is often difficult for operators to control the amount. Easy access to the inside of the bearing along the shaft. It is best not to apply oil or grease in the bearing chamber.

4. Prevention of paint rust: The characteristic of paint rust is that it occurs frequently in sealed motors. The motor sounds very good during assembly, but after being placed in the warehouse for some time, the abnormal noise of the motor changes. It is very large, and the bearing is seriously rusted when the bearing is removed.