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Rolling bearings themselves do not produce noise
发布时间:2021-10-14浏览次数:0

Vibration generation in SKF bearings [table] Generally speaking, rolling bearings themselves do not produce noise. Usually felt "bearing noise" is in fact the bearing directly or indirectly with the surrounding structure of the vibration of the sound effect. This is why many times the noise problem can be regarded as involving the vibration problem of the whole bearing application.


The excitation caused by the change of the number of loading rollers


When a radial load is loaded on a bearing, the number of rolling bodies carrying the load will change slightly in operation, that is, 2-3-2-3.... This causes a shift in the direction of the load. The resulting vibration is unavoidable, but can be alleviated by axial preloading on all rolling bodies (not applicable to cylindrical roller bearings).


Local damage


Due to operation or installation errors, a small part of the bearing raceway and roller may be damaged. Rolling over damaged bearing parts during operation produces a specific frequency of vibration. Vibration frequency analysis can identify damaged bearing components. This principle has been applied in SKF condition monitoring equipment to detect bearing damage. To calculate the SKF bearing frequency, please refer to the calculation program "Bearing Frequency".




Accuracy of relevant components


In the case of close matching between the bearing ring and the bearing seat or the drive shaft, the bearing ring may be deformed by matching with the shape of adjacent parts. If deformation occurs, vibration may occur during operation. Therefore, it is important to machined the housing and drive shafts to the required tolerances, as described in the section "Dimensions, shape and operating accuracy of bearing bases and supports".


pollutants


If run in a polluted environment, impurities may enter the bearing and be rolled by the rolling body. The amount of vibration generated depends on the number, size and composition of the crushed impurity particles. Although it does not produce a typical frequency pattern, a disturbing noise can be heard.


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