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. As we all know, even if the NSK bearing parts are processed by the highest modern manufacturing technology, there will always be a small geometric error in the working surface, so that small fluctuations between the raceway and the rolling body will stimulate the natural vibration of the vibration system.
Although the raceway noise of the NSK bearing is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of NSK bearings and the precise use of NSK bearings for noise reduction and vibration reduction.
The rolling sound is due to the rolling of the rolling elements in the raceway when the NSK bearing rotates to excite a smooth and continuous noise, which only attracts attention when its sound pressure level or tone is extremely large. In fact, the sound energy excited by the raceway sound is limited. For example, under normal conditions, the quality of the 6203NSK bearing raceway is 25~27dB. 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 and vibration are random;
b. The vibration frequency is above 1 kHz;
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. NSK bearing housing rigidity increases, the lower the total sound pressure level, even if the speed increases, its 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 shape of the soap fiber can affect the noise value.
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