Analysis of the influence of ntn thin-wall bearing vibration on service life

In general, rolling bearings in ntn bearings do not generate noise by themselves. The "thin wall 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 bearing application. Excitation due to the change in the number of rolling elements. When a radial load is applied to a thin-walled bearing, the number of rolling elements carrying the load will change slightly during operation, and the resulting vibration is unavoidable. However, it can be relieved by axial preloading and loaded on all rolling elements.

When the waviness of the component is closely matched between the bearing ring and the bearing housing or the transmission shaft, the ntn 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 Due to handling or installation errors, small portions of thin-walled bearing raceways and rolling elements may be damaged. In operation, rolling a damaged ntn bearing component produces a specific vibration frequency. Vibration frequency analysis identifies damaged bearing components. Vibration Behavior in Applications In many applications, the stiffness of the bearing 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 the bearings (including preload and clearance) and their configuration in the application.

Whether ntn bearings can judge the degree of damage according to various needs, and the main consideration in this regard is the effect of damage. For mechanical performance, importance, installation conditions are considered, to the next maintenance The effect determined during the period, but for the case where the defect cannot be used, it is necessary to replace the new thin-walled bearing, and it is necessary to pay attention to the crack of any one of the inner ring, the outer ring, the rolling element, and the cage. This is also an effect that is maintained in this regard. So there are also skills in the sense, the following is to introduce the rules from eight.

After the ntn bearing is subjected to a load, plastic deformation occurs at the contact between the rolling element and the raceway. When the load is too heavy, plastic deformation pits will be formed on the surface of the raceway, and the bearing will generate vibration and noise during operation.

Due to the relative movement of the rolling elements and the raceways and the intrusion of dirt and dust, the rolling bodies and the raceway surfaces are subject to wear. When the amount of wear is large, the bearing ntn, noise and vibration of the shaft are increased, which reduces the running precision of the thin-walled bearing, thus directly affecting the accuracy of some main engines. Therefore, for some precision mechanical bearings, the amount of wear can be used to limit the life of the bearing.