The Use And Selection Method Of Motor Bearings
Bearings are mainly used to support and reduce friction in machinery, so the accuracy and noise of bearings are directly related to the use and life of machinery. However, business personnel often encounter some customers, even if they use the best bearings or imported bearings, their efficiency is not high, 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, and 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 professional manufacturing and sales popular in major companies in the world at present, and this method has also achieved good results since the implementation of Bulletproof motors.
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.
Because there are many types and wide ranges of bearings, the following will mainly analyze the use and selection of the most widely used deep groove ball bearings. It is hoped that people who know less about bearings can deepen their understanding of bearings.
Selection of Motor Bearings
1. Selection of bearing model: The bearing model is generally selected by the user’s technicians according to the use conditions and load bearing 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 the bearing clearance. The business personnel must ask the operating conditions of the bearing, the speed and temperature of the bearing. , with tolerances are directly related to the choice 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 = 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 reach the best state when there is zero clearance, 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.
