The bearing itself is a precision mechanical part. When the bearing is running, only a very thin lubricating oil film is separated between the rolling element and the raceway of the bearing. The thickness of this lubricating film is only one hundred and two hundredths of a sheet of paper. The lubricating film is an important factor for the normal operation of the bearing. If the lubricating film is damaged, it will cause direct contact between the bearing metal and the metal. Generally, the diameter of dust particles is much larger than the thickness of the lubricating oil film. Therefore, when there is contamination inside the bearing, the contamination particles will pierce the lubricating film and affect the lubricating performance of the bearing, which is an important factor leading to the premature failure of the bearing.
In addition, if liquid contaminants enter the bearing, it may cause problems such as corrosion of the bearing and degeneration of the grease, which will also cause the lubrication failure of the bearing.
Therefore, one of the most important factors in bearing installation is cleanliness. This cleanliness includes the cleanliness of the bearing installation environment, the cleanliness of the bearing installation tools, the cleanliness of the shaft and the bearing chamber, etc. These all require cleaning work before bearing installation.
In addition, it is also necessary to avoid contamination of bearings, lubrication, etc. during the bearing installation process.