Causes of bearing failure of automobile shock absorber in NTN bearing operation

NTN bearing mainly shows strong periodicity good repeatability in the whole application process. All normal high-quality stainless steel bearings at the beginning of application, vibration noise are relatively small, but some frequency bands are scattered, the amplitude value is small, which may be caused by some defects in the whole process of production manufacturing, such as surface burr.

After fitness exercise for a period of time, the vibration noise remain at a certain level, the frequency band is very single. The customized shock absorber bearing of Japan South Korea only has one two memory overclocking. The frequency band above three times of DC is very rare, the condition of stainless steel bearing is very stable.

After the second operation, the vibration noise of NTN bearing just began to expand, sometimes abnormal noise appeared, but the vibration expanded to be a common fault in the early stage.

First of all, the quantitative analysis of rolling bearing found that the concentration of rare metal elements was abnormal, there were many sub micron damaged particles of rare metal components in ferrography; the moisture content of grease exceeded the standard, the acid value exceeded the standard, indicating that the roof tile of NTN bearing was eroded.

Secondly, the quantitative analysis of rolling bearing found that the iron concentration value was abnormal. There were a lot of iron components in the ferrogram of automobile domestic shock absorber bearing, submicron damaged particles, abnormal water content acid value of lubricating grease, indicating that the bearing back of rolling bearing was damaged by the shaft body.

Third, there are iron drilling grinding particles gray black metal oxide particles in the ferrography of stainless steel bearing, there are tempering color on the metal surface of suspension bearing, which indicates that the surface layer of motor shaft of rolling bearing is bruised.

Fourth, drill grinding particles are found in NTN bearing ferrography, the grinding particles are composed of rare metals, which indicates that the surface of rolling bearing is bruised.

Fifthly, the quantitative analysis of rolling bearing found that the iron concentration value was abnormal, there were a lot of submicron particles of iron composition in ferrography, the moisture content acid value of lubricating grease exceeded the standard, indicating that the surface layer of motor shaft of cylindrical roller bearing was eroded.