How to install to enable TIMKEN self-aligning ball bearings to achieve the longest service life

Core Tip: In order to ensure the long life of TIMKEN self-aligning ball bearings, it is not enough to meet the general installation and adjustment requirements. It is recommended to take the following measures: (1) According to TIMKEN self-aligning ball bearings
In order to ensure the long life of TIMKEN self-aligning ball bearings, it is not enough to meet the general installation and adjustment requirements. It is recommended to take the following measures:
    (1) The TIMKEN self-aligning ball bearings are grouped according to the size of their interference fit surface. In each group, the TIMKEN self-aligning ball bearings are arranged in order of their clearance size. The corresponding shaft or seat hole diameters are grouped in the same way. The TIMKEN self-aligning ball bearing set with a large interference fit surface size is matched with a large diameter shaft set or a seat hole set, and a small size and a small diameter corresponding group are selected. In each corresponding group of matching, the TIMKEN self-aligning ball bearing with large clearance is tightly matched, and the TIMKEN self-aligning ball bearing with small clearance takes a loose fit. The result of this selection makes the TIMKEN self-aligning ball bearing have the same interference and interference in the same batch of machines, which is neither too loose nor too tight, and the clearance is relatively uniform, thus ensuring the installation of TIMKEN self-aligning ball bearings. After the pre-stress is appropriate, and avoid creep, ferrule bursting, impact due to improper play, vibration or heat, cohesion and other abnormal TIMKEN self-aligning ball bearing failure.
    (2) The coaxiality of the journal and the seat hole at both ends of the support and the perpendicularity to the support end face are strictly ensured to prevent the occurrence of additional load. If possible, the mechanical components acting on the load outside the TIMKEN self-aligning ball bearing should be slightly away from the TIMKEN self-aligning ball bearing at the end that is more susceptible to damage, while the shaft and rotating part system should be as smooth as possible.

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Causes of vibration of NTN tapered roller bearings during operation

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.

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