The solution of rolling bearing noise

The noise caused by problems in bearing application can be divided into two types: scratch sound and dust sound, as follows:

(1) Scar sound and its control methods

If there are cracks, indentations, or rust on the rolling surface of rolling bearings, periodic vibration and noise like riveted rivets will occur. The period may be fixed but mostly corresponds to the rotational speed. The scars will continue to occur on the channel, and the scars will appear on the steel ball from time to time. This noise varies with installation and lubrication conditions.

The control methods for this type of noise include: Do not hit the bearing during installation, and prevent the bearing from tilting when assembling it with the shaft and then installing it into the bearing seat; Prevent bearing corrosion during inventory and prevent impact vibration during transportation; Use high viscosity lubricating grease.

(2) Dust Sound and Its Control Methods

There are foreign objects such as dust inside the rolling bearing, which can cause non periodic vibration and so-called dust noise. The magnitude of the vibration and noise varies, and they may or may not be present.

The control methods for dust noise include improving the cleaning method of bearings, and ensuring that all bearings, shafts, seat holes, and matching parts are thoroughly cleaned before installation; Remove foreign objects from the lubricant; Improve the sealing of bearings; Avoid using plastic cages with impure materials or embedded foreign objects.

(3) Noise caused by lubrication factors and its countermeasures

Incorrect selection of lubricants, insufficient lubricants, or aging and hardening can all lead to vibration and noise in bearings, and this noise does not have a certain pattern. For this situation, only by selecting appropriate lubricants, adjusting their lubricant quantity, extending the service life of lubricants, and reasonably determining the replacement cycle.

Noise related to the host and its countermeasures

This type of noise is not solely caused by bearings, so it is futile to search for the cause solely from the bearing aspect. Therefore, comprehensive attention should be paid to the main engine, and if necessary, the performance of the main engine should be improved. This article mainly describes the common buzzing and frame resonance sounds in electric motors.

(1) The Buzzing Sound of Electric Motors and Its Countermeasures

The axial vibration of the motor shaft can cause significant high-frequency noise - buzzing sound, which has the same frequency as the axial vibration frequency and can be either constant or variable. The prevention method for buzzing is the same as for preventing axial vibration.

(2) Resonant Sound of Bearing Frame and Its Countermeasures

When the axial natural vibration of the outer ring mass system causes the axial bending natural vibration of the bearing frame, a noise called resonance sound is generated accordingly. The method of increasing pre tightening can increase the axial natural frequency of the outer ring mass system, disrupt resonance conditions, and reduce noise.