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After more than ten years of technical precipitation and market polishing, Aotong has seized the demand trend of high-end axle products in the international and domestic markets and officially entered the field of high-end assemblies.
What is the difference between domestic and imported bearings?
Release Time：
2021-09-15
Although the dimensional deviation and rotation accuracy of domestic bearings are very close to those of imported bearings. However, there is still a certain gap in dispersion with the bearings imported from Germany. Foreign countries have already begun to study and apply such fine rotation accuracy indicators as "non-repeatable beating", but China's research in this area is still blank.
1. The accuracy of the bearing
Although the dimensional deviation and rotation accuracy of domestic bearings are very close to those of imported bearings. However, there is still a certain gap in dispersion with the bearings imported from Germany. Foreign countries have already begun to study and apply such fine rotation accuracy indicators as "non-repeatable beating", but China's research in this area is still blank.
2. In terms of vibration, noise and abnormal sound
Japan has introduced silent and ultra-quiet bearings, while the vibration extreme level of Chinese bearings is generally more than 10dB different from that of Japanese bearings.
3. In terms of life and reliability
Taking deep groove ball bearings as an example, the life of foreign famous brand products is generally more than 8 times the calculated life (up to more than 30 times), and the reliability is more than 97% (or the life expectancy of the main engine), while the life of Chinese bearings is generally It is only 3 to 5 times the calculated life, and the reliability is about 95%.
4. In terms of high-speed performance
The DmN value of foreign famous brand products is 4 x 106 mm r/min, while the Chinese bearing is only 2 x 106 mm r/min
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