Why NSK bearings generate noise during work
It is impossible to absolutely eliminate friction in any bearing including NSK bearings, so noise is inevitable due to the presence of friction during operation. According to the standard, the noise should be within a certain range, and if the noise is high, it means that the bearing has a fault.
The cause of noise generated by NSK bearings is more complicated. One is the wear of the inner and outer rings of the bearing. Due to this wear, the coupling relationship between the bearing and the housing, the rolling bearing and the shaft is broken, causing the axis to deviate from the correct position and generate an abnormal sound when the shaft is moving at a high speed. When the automobile bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. In addition, insufficient bearing lubrication, dry friction, and bearing crushing can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and abnormal noise is also generated.
The bearing sound of the bearing and its control mode is the kind of slippery continuous sound that the moving body is moving on the raceway surface when the car bearing is running. What types of bearing seals are there? . It is the unique sound of the city that has no moving bearings. The general bearing sound is equal to the rolling sound plus other sounds. The ball bearing sound is unlawful, the frequency is above 1000Hz, its frequency does not change with the speed, but its sound pressure level is added with the acceleration of the speed. For bearings with large rolling sounds, the sound pressure level of the raceway sound is reduced with the addition of viscosity; and for a small bearing with small raceway sound, the sound pressure level is reduced by a viscosity of about 20 mm2/s or more. Turned to nothing to delete. The greater the rigidity of the bearing housing, the lower the sound pressure level of the raceway sound. If the radial play is too small, the sound pressure level of the raceway sound and the frequency will be sharply added to the cut of the radial play. There is no way to control the rolling sound: choose low-noise bearings, that is, bearings with small waviness, and carefully choose the premise. The raceway sound often affects zero mechanical noise, and the reduction of the raceway sound can reduce zero mechanical noise.
Impact sound of the moving body and its control mode When the larger ball bearing or NSK bearing is running at low speed under pure radial load, the dynamic body in the non-loading area will impact the connecting frame or roll due to the small centrifugal force of the moving body. The road emits noise. But with the advancement of the speed, the sound of that type will disappear. There is no control method for the impact sound of the moving body: the radial clearance is appropriately cut, and the bearing of the connecting frame without the reasonable layout and the material is not harmonious.
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