Analysis of Rolling Noise Analysis of IKO Bearings

The rolling sound is caused by the rolling of the rolling elements in the raceway when the IKO bearing rotates to excite a smooth and continuous noise, which only attracts attention when its sound pressure level or tone is extremely large. In fact, the sound energy excited by the raceway sound is limited. For example, under normal conditions, the quality of the 6203IKO bearing raceway is 25 to 27 dB. This type of noise is the most typical of single row deep groove IKO bearings that can withstand radial loads. It has the following characteristics:

a. Noise and vibration are random;

b. The vibration frequency is above 1 kHz;

c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;

d. When the radial clearance increases, the sound pressure level increases sharply;

e.IKO bearing housing rigidity increases, the lower the total sound pressure level, even if the speed increases, its total sound pressure level does not increase much;

f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and shape of the soap fiber can affect the noise value.

The rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise. It is well known that even if IKO bearing parts are processed using the most advanced manufacturing techniques in the world, there will always be small geometric errors in the working surface, which will cause small fluctuations between the raceway and the rolling elements to excite the natural vibration of the vibration system.

Although the raceway noise of IKO bearingsis unavoidable, in the high-precision machining of the working surface of the parts, the IKO bearing is correctly selected and the IKO bearing is accurately used to reduce noise and vibration.

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How to solve the problem of INA bearing essential noise

Often affecting the noise of the entire machine, reducing the sound of the raceway can reduce the noise of the entire machine.

Impact sound of rolling element and its control method When the larger type of ball INA bearing or cylindrical roller INA bearing runs at low speed under pure radial load, the rolling element in the non-load area will impact due to the small centrifugal force of the rolling element. Noise is generated by the cage or raceway. But as the speed increases, the sound will disappear. The control methods for the rolling body impact sound are: appropriately reducing the radial clearance, and using an INA bearing with a reasonable structure and a flexible material.

The rolling noise of INA bearing and its control method The rolling sound is the harsh metal friction sound of cylindrical roller INA bearing which can occur in all occasions. Most of them occur in grease-lubricated larger type INA bearing, and the performance in base oil Deteriorated grease is more likely to occur and hardly occurs when oil is lubricated.

In addition, it is more likely to occur in winter. When subjected to pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a certain speed range depending on the size of the INA bearing model. Continuous occurrences will occur intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling noise. If necessary, use this INA bearing, or reduce the radial clearance of the INA bearing, use the excellent grease and improve the matching with the INA bearing. The rigidity of the piece. Can't add more.

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