What are the main solutions for bearing noise?

There are two kinds of noises caused by problems in bearing applications. There are two common types of sounds: scars and dust. They are described as follows:

1.Sound sound and its control method

If the rolling surface of the rolling bearing has cracks, indentations or rust, periodic vibration and noise such as riveting rivets will occur. The period may be fixed but most of them have a certain corresponding relationship with the rotation speed. The flaws will continuously occur on the channel The scars appear on the steel balls from time to time, and the noise varies with installation and lubrication conditions.

Control methods for this type of noise include: do not knock on the bearing during installation, prevent the bearing from being tilted when the bearing and shaft are assembled and then installed in the bearing seat; prevent bearing corrosion when in stock and prevent shock and vibration during transportation; use high viscosity lubrication fat.

2. There is foreign matter such as dust in the rolling bearing. Non-periodic vibration and so-called dust sound will occur. The magnitude of vibration and noise is uncertain, and it may or may not exist.

The control methods of dust sound include: improving the cleaning method of the bearing, before the installation, the bearings, shafts, seat holes and matching parts are strictly sanitary and clean; remove the foreign matter in the lubricant; improve the bearing seal; avoid using impure or embedded Plastic cage with foreign objects.

3. Noise caused by lubrication factors and its countermeasures

The wrong choice of lubricant, insufficient lubricant or aging hardening can lead to vibration and noise in the bearing, and this noise has no regular pattern. In this case, only the appropriate lubricant can be selected, the amount of lubricant can be adjusted, the service life of the lubricant can be extended, and the replacement cycle must be reasonably determined.

Host-related noise and countermeasures

This kind of noise is not caused by the bearing alone, so it is futile to find the cause from the bearing alone. It is necessary to pay full attention to the host and improve the performance of the host if necessary. Mainly describes the common beep sound and frame resonance sound in the motor.

1. The beep of the motor and its countermeasures

The axial vibration of the motor shaft will cause a large high-frequency noise-buzzer, the frequency of which is the same as the axial vibration frequency, which can be constant or variable. The beep sound is prevented in the same way as the axial vibration.

2. Bearing frame resonance sound and its countermeasures

When the above-mentioned mass of the outer ring is caused by the axial natural vibration of the bearing frame, a kind of noise called resonance sound is generated accordingly. Increasing the pre-tensioning method can increase the axial natural frequency of the outer ring mass system, destroy the resonance conditions, and reduce noise.