Bearings with relatively small noise 
1) ball bearing roller bearing noise ratio is low, less sliding bearings (friction) noise more than the sliding bearing is low; 
2) The use of solid cage bearing relative to the noise than with low-stamping bearing cage; the use of plastic cage bearing noise more than the use of the bearing cage are two low; the ball a few more, thick outer ring, the noise also smaller, 
3) high precision bearings, in particular, the use of higher precision rolling bearings, the noise than the low-noise precision bearing is relatively small, 
4) Small bearing bearing noise ratio of noise is relatively small. 2) low-noise requirements of the rolling bearing 
The production of standard bearings in China, some single row radial ball bearings and cylindrical roller bearings are used in low-power machine bearing noise variety. One ball bearing inner diameter ��2.5mm to ��60mm from a number of varieties with Zl, Z2 and Z3 are three suffixes, corresponding to three different low-noise requirements, and roller bearings from N309 to N322 type-type models have a total of eight produced by low-noise standard varieties. 
These bearings can be applied to other low-noise requirements of the machine, and the price is cheap, as in the type and size to meet the requirements, as far as possible these two types of low-noise bearings.