In fact, the sound energy stimulated by the rolling track is limited. For example, under normal conditions, the quality of the 6203 bearing raceway is 25 to 27 dB. This type of noise is the most typical of single row deep groove ball bearings that can withstand radial loads. It has the following characteristics:
a, noise, vibration is random;
b, the vibration frequency is above 1kHz;
c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;
d. When the radial clearance increases, the sound pressure level increases sharply;
e, the rigidity of the bearing seat increases, the lower the total sound pressure level, even if the rotation speed increases, the total sound pressure level does not increase much;
f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and the shape and size of the soap fiber can affect the noise value.
The source of the rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise.
Although the bearing raceway noise is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of the bearing and the precise use of the bearing to reduce noise and vibration.
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