NTN bearing raceway noise analysis - bearing knowledge

Race is due to the NTN bearing rotates in the raceway roller rolling and inspire a smooth and continuous noise, only when the sound pressure level or tone great concern. Actually raceway sparked by the sound of sound energy is limited, such as in normal circumstances, quality of 6203 NTN bearing raceway is 25 ~ 27 db. This noise to bear radial load of single row deep groove ball NTN bearing as the most typical, it has the following characteristics: a. Randomness of noise and vibration; b。 The vibration frequency above 1 KHZ; c。 No matter how the speed of change, the main frequency noise almost unchanged while the sound pressure level increase with the increase of rotational speed; d。 When the radial clearance increases, the sound pressure level increased dramatically; e. NTN bearing stiffness increases, the lower the total sound pressure level, even if the speed increases, the total sound pressure level increases; f。 Lubricant viscosity is higher, the lower the sound pressure level, but for grease lubrication, the viscosity, the shape of soap fiber size can influence the noise value. Ring after rolling sound is produced by the load caused by natural vibration. Because of the ring and rolling body elastic contact nonlinear vibration system. When lubrication or the machining accuracy is not high will stimulate the related to the elastic characteristics of natural vibration and passed to the was noise in the air. As is known to all, even if is to use the contemporary the most advanced manufacturing technology and processing NTN bearing parts, there will always be the working surface of varying degrees of tiny geometric error, thus make the raceway and rolling body produces slight fluctuations inherent vibration excitation vibration system. Although the NTN bearing raceway noise is inevitable, but in working surface adopt high precision machining parts, choose correct NTN bearing and precise use NTN bearing noise vibration reduction.