1. Rolling bearings with low noise requirements include: Among the standard bearings produced in my country, some single row radial ball bearings and short cylindrical roller bearings have low-noise varieties used as motor bearings. Among them, there are several types of ball bearings with inner diameters from φ2.5mm to φ60mm with three suffixes: Zl, Z2 and Z3, which respectively correspond to three different low-noise requirements. There are also eight types of roller bearings from N309 to N322. Varieties manufactured to low noise standards. These bearings can be used in other machines with low noise requirements, and are cheap. If the type and size can meet the requirements, try to use these two types of low noise bearings. 2. Use bearings with relatively low noise: When the above two types of low-noise bearings cannot be used, bearings with relatively low noise can be used. The specific comparison basis is as follows: 1) The noise of ball bearings is lower than that of roller bearings. The (friction) noise of bearings with less relative sliding is lower than that of bearings with more relative sliding; those with more balls and thicker outer rings have smaller noise; 2) The noise of bearings using solid cages is relatively lower than that of bearings using stamped cages; 3) The noise of bearings using plastic cages is lower than that of bearings using the above two cages; 4) High-precision bearings, especially bearings with higher-precision rolling elements, have smaller noise than low-precision bearings; 5) The noise of small bearings is relatively smaller than that of large bearings.  

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