Raceway sound is a steady and continuous noise generated by the rolling body in the raceway when the bearing is rotating. Only when the sound pressure level or tone is very high, people will pay attention to it. In fact, the sound energy excited by raceway sound is limited. For example, under normal circumstances, the raceway sound of high quality 6203 bearings is 25 ~ 27dB. This kind of noise is most typical of single row deep groove ball bearing bearing radial load

It has the following characteristics:

1) Noise and vibration have randomness;

2) The vibration frequency is above 1kHz;

3) No matter how the speed changes, the main frequency of noise is almost unchanged while the SPL increases with the increase of the speed.

4) When the radial clearance increases, the SPL increases sharply;

5) As the rigidity of the bearing seat increases, the lower the SPL is, even if the speed increases, the SPL does not increase much;

6) The higher the lubricant viscosity, the lower the SPL, but for grease lubrication, its viscosity and the shape and size of soap fiber can affect the noise value. The source of raceway sound is the natural vibration of the ring after being loaded. The nonlinear vibration system is formed by the elastic contact between the ring and the rolling body. When the lubrication or machining accuracy is not high, it will excite the natural vibration related to the elastic characteristics, which will become noise when transmitted to the air.

As we all know, even if the most advanced manufacturing technology is used to process bearing parts, there will always be small geometric errors of varying degrees on the working surface, so as to generate small fluctuations between the raceway and the rolling body to stimulate the inherent vibration of the vibration system. Although it is inevitable, it can take high precision machining parts of the working surface, the correct selection of bearings and accurate use of bearings to reduce noise and vibration.

If you have any questions,pls feel free to ocntact us.

e-mail:bearing6@hyzcgroup.com