Analysis of the Characteristics of Raceway Noise in NSK Bearings
Source: Bearing Network | Date: January 24, 2014
When an NSK bearing rotates, the rolling elements move along the raceway, producing a smooth and continuous sound known as rolling noise. This noise is usually low in intensity and does not typically draw much attention unless it becomes unusually loud. In normal conditions, the sound level of a 6203 NSK bearing is around 25–27 dB. This type of noise is commonly associated with single-row deep groove ball bearings that are designed to handle radial loads. It has several distinct characteristics: - The noise and vibration occur randomly. - The oscillation frequency is generally above 1 kHz. - The main frequency of the noise remains almost constant regardless of speed, although the sound pressure level increases with higher speeds. - An increase in radial clearance leads to a sharp rise in sound pressure levels. - Increasing the rigidity of the bearing housing can reduce the overall sound pressure level, even at higher speeds. - Higher viscosity grease tends to lower the noise level, but the grease's consistency, soap fiber structure, and other properties also play a role in noise generation. The noise from the raceway is caused by natural vibrations in the inner or outer ring when subjected to load. These vibrations arise from the nonlinear oscillating system formed by the elastic contact between the rings and the rolling elements. If the surface finish or machining precision is not high, these vibrations may become more pronounced and eventually manifest as audible noise. Even with the most advanced manufacturing techniques, minor imperfections on the bearing components are inevitable. These small irregularities cause micro-movements between the rolling elements, which trigger the natural oscillations of the system. Although raceway noise in NSK bearings is unavoidable, it can be minimized through the use of high-precision components, proper selection of bearings, and correct installation and maintenance practices. These measures help reduce both noise and vibration, ensuring smoother operation and longer service life.
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