Depending on size and speed, rolling bearings have their own unique sound. If we can clearly identify the causes of the following sounds, it will be of great help to judge the bearing damage in advance.

The sound of retainer

In the process of bearing rotation, the cage’s free vibration and its collision with the rolling body or the ring will produce this noise. It may appear in all kinds of bearings, but its sound pressure level is not too high and is low frequency.

Its characteristics are:

1) Stamping cage and plastic cage can be produced.

2) Both thin oil and fat lubrication will occur.

3) It is most likely to occur when the outer ring is subjected to bending moment.

4) It is easy to appear when the radial clearance is large.

It is very difficult to eliminate cage sound completely because cage hole clearance and cage and ring clearance are unavoidable in bearing finished products. However, it can be improved by reducing assembly error and optimizing reasonable clearance and cage flow momentum.

Another cage special sound is the noise caused by self-excited vibration of the cage caused by friction between the cage and the guide surface of other bearing parts. The stamping cage of deep groove ball bearings is thin, the bending stiffness in radial and axial planes is low, and the overall stability is poor. When the bearing is rotating at high speed, it will produce self-excited vibration due to bending deformation, causing “buzzer”.

When bearing under radial load and oil under the condition of poor performance, will hear a “kacha, kacha” in the early years of the operation noise, this is mainly due to the rolling element load area after you leave, rolling body acceleration and collided with cage and noise, the crash but as the inevitable operation after a period of time will disappear.

Measures to prevent cage noise are as follows:

1. In order to ensure the stability of cage revolution movement, the ring guide mode should be adopted as far as possible and the guide surface should be fully lubricated. The structure of tapered roller bearing under high-speed working conditions should be improved, and the L-type cage guided by roller should be changed to the Z-type cage guided by ring rim.

2. When the bearing rotates at high speed, the vibration amplitude of the cage of the bearing with large pocket clearance is much greater than that of the cage with small pocket clearance, so the value of pocket clearance is particularly important. Care should be taken to minimize radial clearance. It is beneficial to reduce the noise caused by the collision or friction between the rolling body and the cage by improving the manufacturing accuracy of the cage and improving the surface quality of the cage.

3. Actively use advanced cleaning technology to effectively and thoroughly clean the products after spare parts and sets, and improve the cleanliness of bearings.

4, when the bearing under the effect of radial load, its internal only several rolling element load bearing, due to the elastic contact with ring of “spring” of supporting roller in periodic vibration produced by radial load line, the rotation center so move the vertical or horizontal direction, at the same time cause noise.

This kind of vibration is called rolling body through vibration, especially at low speed. The amplitude is related to bearing type, radial load, radial clearance and number of rolling bodies. In general, the amplitude is small, and only when the amplitude is large will the hazard be formed. Therefore, radial clearance is often reduced by reducing the radial clearance or applying appropriate preload.

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