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2023

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12

Solutions to measures to prevent noise of imported bearing retainers

Author:


When the imported bearing rotates, the free vibration of the holder and its impact with the rolling body or ring will lead to noise.

This noise may occur in various bearings, but the sound pressure level is low and the frequency is low. Its characteristics are:

A. This noise may be generated by both stamping retainers and plastic retainers.

B. This noise will occur in both dilute oil and grease lubrication.

C. This noise is most likely to occur when the outer ring bears the bending moment.

D. This noise is easy to occur when the radial clearance is large.

Since the gap between the hole of the cage and the gap between the cage and the ring inevitably exist in the finished bearing, it is very difficult to completely eliminate the noise of the cage, but it can be improved by reducing the assembly error, selecting a reasonable gap and the movement of the cage.

Another special sound of the holder is the noise caused by the self-excited vibration of the holder caused by the friction between the guide surface of the holder and other bearing parts. The stamping holder of the imported bearing is thin, with low bending stiffness in the radial and axial planes, and poor overall stability. When the bearing rotates at high speed, it will produce self-excited vibration due to bending deformation, causing "beep".

When the bearing is under the action of radial load and the grease performance is poor, the noise of "kake and click" will be heard in the early stage of operation. This is mainly due to the sudden acceleration of the rolling body after leaving the load area and collides with the retainer, resulting in noise. This impact sound is inevitable, but as the operation time increases, the sound will gradually disappear.

There are three ways to solve the noise caused by improper lubricants in imported bearings:

Choose the right lubricant;

Add lubricant according to the specified amount of lubrication;

Replace the lubricant regularly to avoid aging and hardening of the lubricant.

Cleanse

First of all, the bearing needs to be removed for inspection and its appearance needs to be recorded. At the same time, the amount of remaining lubricant in the bearing should be determined, sampled, and then the bearing should be cleaned.

Cleaning can be divided into two steps: coarse washing and fine washing. Usually, neutral water-free diesel or kerosine is used as a cleaning agent, and it is often filtered to keep clean. After cleaning, anti-rust oil or anti-rust grease should be coated on the bearing surface immediately to avoid oxidation and corrosion.

Inspection and judgement

In order to determine whether the removed imported bearing can be used again, it is necessary to check their dimensional accuracy, rotation accuracy, internal clearance, as well as the matching surface, raceway surface, retainer and sealing ring. The inspection results can be evaluated by people who are familiar with bearings or proficient in bearing knowledge. Judgement standards may vary according to mechanical properties, importance and inspection cycle.

If the following damage occurs, the rolling bearing must be replaced and cannot be reused:

Imported bearing parts have fractures and defects.

The raceway surface and rolling surface are peeled off.

In short, when judging whether imported bearings can continue to be used, it is necessary to comprehensively inspect and evaluate them and judge them according to relevant standards. If the above damage occurs, the bearing must be replaced immediately to ensure the safe operation of the machine and equipment.