the reason of bearing noise
When the bearing is in normal operation, the bearing will also produce noise because of high-speed rotation. This noise will not affect the life of the machine and the bearing, which is the normal noise of the bearing. It should be noted that the inherent normal noise of rolling bearings cannot be avoided, nor can it be eliminated.
1. Collision between the rolling body and the raceway in the non-load area: the bearing rolling body runs in the bearing raceway. When the rolling body runs in the non-load area, the rolling body will appear and the raceway in the radial or axial collision. This is because the rolling body itself comes out of the load area and has a certain linear speed. At the same time, the rolling body has a certain centrifugal force. To rotate around the axis, it will collide with the raceway, so it produces noise. Especially in the unloaded region, the collision noise is particularly obvious when there is residual clearance. In general, the greater the clearance of bearings, the greater the noise.
2. Collision between the rolling body and the cage: the main function of the cage is to guide the operation of the rolling body. Collisions between rollers and cages are also a source of noise. Such collisions can be circumferential, radial, and possibly axial. From the point of view of motion state, including the rolling body in the load area, the rolling body actively push the cage when the collision; Collision when the cage is pushing the rolling body in the unloaded zone. The rolling body collides with the cage in the radial direction due to centrifugal force. Because of disturbance, the axial motion of the rolling body and the collision of cage will produce noise.
3. Rolling body mixing grease: when the bearing is filled with grease, there is a mixing of grease in the operation of rolling body. This stirring also produces a corresponding noise.
4. Sliding friction of rolling body in and out of the load area: there is a certain sliding friction between the rolling body and the raceway when it enters the load area. Some sliding friction may also occur when leaving the load zone.
5. The internal movement of other bearings: for bearings with seals, the friction between seals and lips will also bring noise.
As can be seen from the previous analysis, these motion states produce noise due to collision and friction. For a normal qualified bearing, it is not difficult to find that these noises are closely related to the speed. For example, the friction of the rolling body when entering and leaving the load area, the collision of the rolling body with the cage inside and outside the load area, grease mixing and the friction of the seal lip will change with the change of the speed.
When the motor is at a constant speed, these movements should be in a stable state. Therefore, the excited bearing noise at this time should be a stable and uniform sound. From this we can infer that the normal noise of a bearing should have a basic characteristic, that is, stability and uniformity. The sound of stability and uniformity is not a constant sound. Because many states of motion, such as collisions, occur once and for all, these sounds are a steady, small periodic sound. Of course, it also includes some continuous sounds, such as the friction of seals.
In actual working conditions, such as the existence of some interference, bearing noise will also appear to a certain degree of stability and uniformity. But this kind of bearing noise often doesn’t sound like the frequency the bearing should have. Therefore, when judging the bearing noise at the scene, in addition to stability and uniformity, it is often necessary to add a no abnormal frequency (auditory sensation).
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