Analysis of the Rolling Noise of NSK Bearings in Japan

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During the use of NSK bearings, it's common to encounter various types of noise. One less frequently discussed sound is the rolling noise. This is the smooth and continuous sound produced when the rolling elements move over the raceway during rotation. Although it’s usually not disruptive, in some cases, the sound pressure level can become high enough to draw attention. The rolling noise is typically a result of the natural oscillation within the bearing system. In normal conditions, the noise generated by a 6203 bearing’s raceway is around 25–27 dB. This type of noise is most commonly associated with single-row deep groove ball bearings that are subjected to radial loads. It has several characteristics: - The noise and vibration are random in nature. - The frequency of the oscillation is above 1 kHz. - The main frequency of the noise remains almost constant regardless of speed, although the sound pressure level increases as the speed increases. - An increase in radial clearance leads to a sharp rise in sound pressure level. - When the rigidity of the bearing housing increases, the total sound pressure level decreases significantly, even at higher speeds. - Higher viscosity grease tends to reduce the sound pressure level, but factors like the consistency of the grease, its viscosity, and the shape of the soap fibers can also influence the noise level. The origin of this rolling noise lies in the natural oscillations of the inner and outer rings caused by the load. These oscillations occur due to the nonlinear interaction between the elastic contact of the rings and the rolling elements. If the surface finish or machining precision is not high, these oscillations may be amplified and transmitted into the air as audible noise. Even though rolling noise is unavoidable, it can be minimized through high-precision machining, proper selection of bearings, and correct installation. By following these practices, users can significantly reduce unwanted noise and vibration in their applications.

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