The reason of NSK bearing noise

For the using of bearing, it is very normal to have noise even for the low noise NSK bearing. Why it has noise, today I will introduce you the truth.
(1) the noise of roller and the way to grasp it   roller noise is when the bearing is running, the roller and the race will make a sound, it is the basic sound of all roller bearing. Special bearing noise are roller noise plus other noise. The roller noise of Ball bearing is not regular with the frequency of more than 1000HZ. Its main frequency will not change with the speed, but its total sound pressure increase when the speed is slower. Bearing with big roller noise, its sound pressure will increase when the viscosity increse, while bearings with small roller noise its sound pressure will increase to its upmost when the viscosity increase to more than 20mm2/s. the biggest rigitity of bearing housing will have smallest sound pressure. When the radial clearance is small, the sound pressure and the main frequancy will sharply increase when the clerance increase. The ways to grasp the roller noise are to choose low noise sound which are small ripple bearings. Roller noise always determines the whole noise of machinery, to increase roller noise will increase the sound of the whole machinery.

(2) the impact noise of roller and the way to grasp it    Larger models of ball bearings or cylindrical roller bearings in low-speed operation under pure radial load, since the centripetal force of rolling is small and in a non-load rolling element will impact the maintenance and recovery of aircraft noise or roller. With the speed increase of roller, the sound will disappear. The way to grasp the impact sound are to appropriatly increase radial clearance and to use reasonable structure and maintenance of a supple frame of the bearing.

(3) the jarring sound of bearing and the way to grasp it  the jarring sound of bearing is a cylindrical roller bearings in all areas of the grate on the ear can attack the metal friction sound. It mostly happens in big mode bearing and big smooth grease. It never happens when the grease is smooth but happens easily when the deterioration of oil-based lipid. It happens more in summer. When suffering pure radial load, radial clearance in a large easy to attack the place, and with the models of the size of the differences in the size of a given speed within easy attack, not only to extend the attack would emerge intermittently. External ring raceway using special processing methods to avoid the jarring sound of the emergence, if necessary, use this bearing, or the right to add the radial bearing clearance, use the smooth performance and progress with the bearing grease to match the rigid parts .

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