Generally speaking, the rolling bearing itself does not produce noise. The “bearing noise” usually felt is actually the sound effect of the vibration of the bearing directly or indirectly with the surrounding structure. This is why many times the noise problem can be regarded as a vibration problem involving the whole bearing application.

(1) Excitation caused by the change of the number of loaded rolling bodies: when a radial load is loaded on a bearing, the number of rolling bodies carrying the load will change slightly in operation, which causes the deviation of the load direction. The resulting vibration is inevitable, but can be alleviated by axial preloading on all rollers (not applicable to cylindrical roller bearings).

(2) Local damage: due to operation or installation errors, a small number of bearing raceway and rolling body may be damaged. During operation, rolling over a damaged bearing component produces a specific vibration frequency. Vibration frequency analysis can identify damaged bearing parts. This principle has been applied in condition monitoring equipment to detect bearing damage. To calculate the bearing frequency, please refer to the calculation procedure “Bearing Frequency”.

(3) Accuracy of relevant components: in the case of close coordination between the bearing ring and the bearing seat or the transmission shaft, the bearing ring may be deformed in accordance with the shape of the adjacent parts. If deformation occurs, vibration may occur during operation.

(4) Pollutants: If run in a polluted environment, impurities may enter the bearing and be rolled by the rolling body. The degree of vibration produced depends on the number, size, and composition of the crushed impurity particles. While not producing the typical frequency form, a disturbing noise can be heard.

The reasons for the noise of rolling bearings are complex. One is the wear of the inner and outer rings of bearings. Because of this wear, the mating relationship between the bearing and the shell, the bearing and the shaft is destroyed, resulting in the axis deviating from the correct position, and abnormal noise is generated when the shaft is moving at high speed. Bearing person wechat professional depth, worth observing! When the bearing is tired, its surface metal spalling will also increase the radial clearance of the bearing and produce abnormal noise. In addition, insufficient bearing lubrication, the formation of dry friction, and bearing crushing will produce abnormal sound. After the bearing is worn loose, the cage is loose and damaged, which will also produce abnormal noise.

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