The raceways sound inspired a smooth and continuous noise, rolling element bearings rotating scroll through the raceway great when draw attention only when the sound pressure level or tone. Fact, the raceways acoustic excitation acoustic energy is limited, such as in normal circumstances, the quality 6203 bearing raceway sound is 25 ~ 27dB. This noise to bear radial load single row deep groove ball bearing is the most typical, and it has the following characteristics:
a. noise, vibration is random;
b vibrational frequencies above 1kHz;
regardless of the speed of how change, the main frequency of the noise is almost constant sound pressure level with the speed and improve;
radial clearance increases, the sound pressure level increased dramatically;
e chock rigidity increases, the overall sound pressure level is lower, even if the speed increases, the total sound pressure level also increased little;
f. the higher the viscosity of the lubricant, the sound pressure level is lower, but for the grease, its viscosity, the shape and size of the soap fibers can affect the raceway sound generating sources is by the load after the ferrule due to the natural vibration. Rings and rolling bodies elastic contact a nonlinear vibration system. Will stimulate the natural vibration of the elastic characteristics when lubrication or not high machining accuracy, passed to the air becomes noise. As we all know, even the highest contemporary ultra-bearing parts of manufacturing technology and processing work surface there will always be varying degrees of tiny geometric error, so roll tiny fluctuations Road and rolling body to stimulate the natural vibration of the vibration system.
Bearing raceway noise is inevitable, however, can take high-precision machined parts work surface, the correct selection of bearings and precision using the bearing so NVH.


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