INA supercharger bearing fault damage standard
From the peeling, indentation, rust, crack, wear and so on, it will be reflected in the vibration measurement of the bearing. The INA bearing vibration is very sensitive to the damage of the bearing. Therefore, the supercharger bearing adopts a special bearing vibration measuring device ( The frequency analyzer can measure the magnitude of the vibration, and the specific situation of the abnormality cannot be inferred by the frequency division. Since the measured values differ depending on the conditions of use of the bearing or the mounting position of the sensor, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
Because the INA bearing emits abnormal sounds and irregular sounds even if it is slightly peeled off, it can be distinguished by the sounder. The sounder is used to measure the size and sound quality of the running supercharger bearing. Check it to prevent it in advance.
1. Rolling surface metal peeling
The bearing rolling elements and the inner and outer ring raceways are subjected to periodic pulsating loads, resulting in periodic changes.
Contact stress. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the rolling element or the inner and outer ring raceways. If the load on the INA bearing is too large, this fatigue will be exacerbated. In addition, the supercharger bearing is not properly installed, the shaft is bent, and the raceway is peeled off. Fatigue spalling of the bearing races reduces the accuracy of the shaft and causes vibration and noise in the mechanism.
2. Bearing burn
The burned INA bearing has a tempering color on the raceway and rolling elements. The causes of burns are generally insufficient lubrication, the quality of the lubricant does not meet the requirements or deterioration, and the supercharger bearing assembly is too tight.
3. Plastic deformation
Uneven pits appear on the contact surface between the raceway and the roller of the bearing, indicating that the bearing is plastically deformed. The reason is that under the action of large static load or impact load, the local stress of the working surface exceeds the yield limit of the material.
This type of situation generally occurs on bearings that rotate at low speeds.
4. Bearing race crack
The cause of the crack in the bearing race may be that the bearing is too tight, the foreign or inner ring of the INA bearing is loose, the containment of the supercharger bearing is deformed, and the surface of the mounted bearing is poorly processed.
