In general, the rolling bearing itself does not produce noise. The "NTN tapered roller bearing noise" that is usually felt is actually the sound effect of the bearing directly or indirectly vibrating with the surrounding structure. This is why many times noise problems can be considered as vibration problems involving the entire NTN tapered roller bearing application.
Excitation due to changes in the number of loaded rolling elements
When a radial load is applied to an imported bearing, the number of rolling elements carrying the load will change slightly during operation, ie: 2-3-2-3.... This causes a shift in the load direction. The resulting vibration is unavoidable, but can be mitigated by axial preloading and applied to all rolling elements (not for cylindrical roller bearings).
Component waviness
In the case of a tight fit between the NTN tapered roller bearing ring and the bearing housing or the drive shaft, the NTN tapered roller bearing ring may be deformed in accordance with the shape of the adjacent component. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the housing and drive shaft to the required tolerances.
Partial damage
Small parts of NTN tapered roller bearing raceways and rolling elements may be damaged due to handling or installation errors. In operation, rolling through damaged NTN tapered roller bearing components produces a specific vibration frequency. Vibration frequency analysis identifies damaged bearing components.
Vibration behavior in applications
In many applications, the stiffness of NTN tapered roller bearings is the same as the stiffness of the surrounding structure. Due to this feature, it is possible to reduce the vibration in the application by properly selecting NTN tapered roller bearings (including preload and clearance) and their configuration in the application.
There are three ways to reduce vibration:
– removing critical excitation vibrations from the application;
– suppressing the critical excitation vibration between the excitation component and the resonance component;
– Change the stiffness of the structure to change the critical frequency.
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