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The mystery of bearing noise

Release time: 2020-05-25 11:51:22 Views: 211

The noise problem in the process of bearing operation has always been a big obstacle to the bearing's high-speed rotation. How is the bearing noise generated and can it be eliminated? The following "Royal micro bearing experts" to help you analyze.

Generally speaking, the rolling bearing itself does not produce noise when the vibration is generated in the bearing. In fact, the "bearing noise" usually felt is the sound effect of vibration generated by the bearing directly or indirectly with the surrounding structure. This is why many times noise problems can be considered as vibration problems involving the entire bearing application.

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

(2) Local damage: a small number of bearing raceways and rolling elements may be damaged due to incorrect operation or installation. In operation, rolling through damaged bearing components will produce a specific vibration frequency. Vibration frequency analysis can identify damaged bearing components. This principle has been used in condition monitoring equipment to detect the bearing damage. To calculate the bearing frequency, refer to the calculation program "bearing frequency". Miniature bearing

(3) Accuracy of related parts: in the case of close fit between bearing ring and bearing pedestal or transmission shaft, the bearing ring may be deformed by matching with the shape of adjacent parts. If deformation occurs, vibration may occur during operation.

(4) Contaminants: if operating in a polluted environment, impurities may enter the bearing and be rolled by rolling elements. The degree of vibration generated depends on the number, size and composition of the impurity particles being rolled. Although it does not produce a typical frequency form, a disturbing noise can be heard. The causes of rolling bearing noise are complex, one of which is the wear of the inner and outer ring mating surfaces. Because of this kind of wear, the matching relationship between the bearing and the shell, the bearing and the shaft is destroyed, and the axis deviates from the correct position, and the abnormal sound is produced when the shaft moves at high speed. When the bearing is fatigued, the surface metal spalling will also increase the bearing radial clearance and produce abnormal sound. In addition, bearing lubrication is insufficient, forming dry friction, and bearing breakage will produce abnormal sound. Bearing wear loose, cage loose damage, will also produce abnormal sound.

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Shanghai Yuwei Bearing Co., Ltd. (Headquarters)
Tel: 021-51099639
Fax: 021-51861291
Email enterprise: yw@gifudayo.com
Address: 2758 Songjin Road, Zhangyan Town, Jinshan District, Shanghai, China
Shaanxi Royal Bearing Manufacturing Co., Ltd
Tel: 029-86696506
Fax: 029-89503160
Email enterprise: sales@gifudayo.com
Address: Qinhan new town free trade zone, Xixian new area, Shaanxi Province
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