Brand bearings are used in the mechanical transmission process to fix and reduce the coefficient of friction of the load. They can also be used to reduce the coefficient of friction in the process of power transmission and to keep the centre of the shaft fixed when other parts are in relative motion with each other on the shaft. A bearing is a pivotal component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body and to reduce the coefficient of friction of the mechanical load of the equipment in the transmission process. According to the different frictional properties of the moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings.
1 Sweden SKF bearing (founded in 1907 in Sweden, a large multinational group of companies, one of the world’s largest bearing manufacturers and service providers)
2 Japan NSK bearing (started in 1916 in Japan, Japan’s first domestic design and production of bearings manufacturers, Japan’s early domestic trial products of domestic bearings)
3 Germany FAG / INA bearing (global rolling bearing and linear motion products production leader, Germany / Europe, one of the larger family-owned enterprise group)
4 Japan NTN bearing (founded in 1918 in Japan, one of the world’s largest bearing manufacturers, a large multinational group of companies, the top ten bearing brands)
5 Timken bearing (1895, the United States, the world’s leading manufacturer of high-quality bearings / alloy steel and related components and accessories, top ten bearing brands)
6 Japan KOYO bearing (founded in 1921 in Japan, the top ten bearing brands, bearings, automotive power driving and machinery and equipment in the field of leading enterprises, Koyo Electronics)
7 Japan NMB bearing (in 1951 Japan, one of the world’s larger miniature and small bearing production enterprises, large multinational group of companies, Shanghai Minebea Precision Machinery and Electronic Co.)
In fact, the same brand will also produce products of different precision and different grades, just that many small enterprises are limited by old equipment and cheap raw materials, unable to produce higher grade bearings. Or the production scale is very large enterprises, will also be because of cost control, market demand and other various reasons, not willing to produce a high grade of products. First of all, declare: as I work in the bearing industry, is considered interest-related, but as a bearing practitioners, hope that in your choice of bearings have help: First of all, you should first clear some technical parameters of bearings, bearings are divided into many grades, precision grade, noise grade, clearance grade, etc.
| ISO | Normal Class | Class 6 | Class 5 | Class 4 |
|---|---|---|---|---|
| ANSI | ABEC1 | ABEC3 | ABEC5 | ABEC7 |
| DIN | P0 | P6 | P5 | P4 |
According to the scenario of bearing use, choose the appropriate accuracy level, based on the current national standard of China GB/T 307.1-2017 can be referred to. By and large, our daily use of bearings, normal requirements on the use of P0, very high requirements on the use of P6, precision machinery with special requirements with P5, military grade high precision with P4
| Fair Poor | Fair Standard | Quiet |
| Z1 | Z2 | Z3 |
There is nothing to say about noise, the more precise the bearing the less noise, generally use the national standard Z2 group is sufficient, there are higher silent requirements with Z3 group.
