When the rolling bearing rotates, the free vibration of the cage and its impact with the rolling elements or rings can cause noise generation.

This type of noise may occur in various bearings, but the sound pressure level is low and low-frequency. Its characteristics are: a. Both stamped and plastic retainers may produce this noise.

b. Both thin oil and grease lubrication will produce this noise.

c. When the outer ring is subjected to bending moment, this noise is most likely to occur.

d. When the radial clearance is large, this noise is prone to occur.

Due to the inevitable existence of clearance between the cage pocket and clearance between the cage and the ring in the finished bearing product, it is very difficult to completely eliminate the noise of the cage. However, it can be improved by reducing assembly errors, selecting reasonable clearances and cage runout.

Another special sound of the cage is the noise generated by the self-excited vibration of the cage caused by the friction between the cage and the guide surfaces of other bearing components. The stamping cage of rolling bearings is relatively thin, and the bending stiffness in the radial and axial planes is low, resulting in poor overall stability. When the bearing rotates at high speed, self-excited vibration will occur due to bending deformation, causing a "buzzing sound"

When the bearing is subjected to radial load and the grease performance is poor, a "click, click" noise will be heard during the initial operation. This is mainly due to the sudden acceleration of the rolling element after leaving the load zone, which collides with the cage and causes noise generation. This kind of impact sound is inevitable, but as the operating time increases, its sound will gradually disappear.

There are three methods to solve the noise caused by improper lubricants in rolling bearings: selecting the correct lubricant; Add lubricant according to the prescribed lubrication amount; Regularly replace lubricants to prevent them from aging and hardening.

If the bearing makes noise due to improper lubricant, there is no need to worry too much, as this problem can be effectively solved. If the bearing surface is damaged or dust enters, there is no need to worry because there are corresponding solutions.

wash

Firstly, it is necessary to remove the bearings for inspection and record their appearance. At the same time, it is necessary to determine the amount of remaining lubricant in the bearing, take samples, and then clean the bearing.

Cleaning can be divided into two steps: rough cleaning and fine cleaning. Neutral and water free diesel or kerosene is usually used as the cleaning agent, and it is often filtered to maintain cleanliness. After cleaning, anti rust oil or grease should be immediately applied to the surface of the bearing to avoid oxidation and corrosion.

Inspection and judgment

In order to determine whether the removed rolling bearing can be reused, it is necessary to specifically check its dimensional accuracy, rotational accuracy, internal clearance, as well as the mating surface, raceway surface, cage, and sealing ring. The inspection results can be evaluated by personnel familiar with bearings or proficient in bearing knowledge. The criteria for judgment may vary depending on mechanical performance, importance, and inspection cycle.

The rolling bearing parts have fractures and defects.

If the following damages occur, the rolling bearing must be replaced and cannot be reused:

The rolling surface and rolling surface have peeled off.

In short, when determining whether a rolling bearing can continue to be used, it is necessary to conduct a comprehensive inspection and evaluation, and make a judgment according to relevant standards. If the above damage occurs, the bearings must be replaced immediately to ensure the safe operation of the machine equipment.