(1) the NSK bearings Raceway Raceway and its control method is to be NSK bearings running, rolling rolling rolling on the pavement and a slippery continuous noise, occurs is all rolling bearing-specific basic sound. General bearing rolling road sound with other sounds. Ball bearing roller is irregular, frequencies in the above 1000Hz, the frequency of rate changes with the speed, but the total sound pressure level increases with the acceleration of the speed of. Roller bearings, its acoustic sound pressure level of the Raceway with the increase and decrease of viscosity and roller bearings of the smaller, its sound pressure level in the viscosity increases to about 20mm2/s above, from reduction to increase. Greater the rigidity of NSK bearings, roller lower the total sound pressure level sound. Radial clearance is too small, Raceway total sound pressure level and frequency of the sound will surge as the reduction in radial internal clearance. Control method of Raceway: Optional low-noise NSK bearings NSK bearing corrugated-small, carefully selected conditions of use. Acoustic noise affecting the entire machinery of the Raceway, Raceway reduction can reduce the noise of the machinery as a whole.
　　(2) impact and control method of rolling the larger model of ball bearings or cylindrical roller bearings NSK under purely radial load at low speed operation, smaller due to the centrifugal force of the rolling, load-free area in the roll cage of rolling elements will shocks or road noise. But as the speed increases, this noise will disappear. On the rolling control method of pulse sound: appropriate reduction of radial clearance, reasonable structure and material compliance cage bearings.
　　(3) Creak and its control method of NSK bearings creak is NSK cylindrical roller bearings on all occasions the possibility of harsh metal sound, mostly in the larger models of grease lubrication bearings, more deterioration of the base oil grease, oil hardly occurs. In addition, more prone to occur during the winter months, when subjected to a purely radial load, and susceptible to radial clearance, and with models of different sizes, occur at a specific speed range easily, both continuous and intermittent. External ring road, take the special processing methods can prevent the emergence of creak, if necessary, select the NSK bearings, or an appropriate reduction of radial clearance of bearings, using high performance greases and match the increase and NSK bearing rigidity of the parts.