Due to the relative movement of the rolling elements and raceways and the intrusion of pollutants and dust, the surfaces of the rolling elements and raceways are worn. When the amount of wear is large, the bearing, noise, and vibration increase, which reduces the running accuracy of the bearing, which directly affects the accuracy of some mainframes. Therefore, for some bearings used in silent machinery, daily maintenance is mainly to prevent the intrusion of pollutants and dust.

1.Impact on bearing life

The cleanliness of the bearing has a considerable influence on the life of the needle roller bearing. The bearing has been specially tested for this, and the result is that the difference is several times or even dozens of times. The higher the cleanliness of the bearing, the longer the life. Tests by others have shown that lubricating oil with different cleanliness has a great impact on the life of the ball bearing. Therefore, improving the cleanliness of the lubricating oil can prolong the life of the bearing. In addition, if the dirt particles in the lubricating oil are controlled below 10um, the life of the bearing will also increase several times.

2.Impact on vibration and noise

The test results of the Bearing Test Center show that the cleanliness seriously affects the vibration level of the bearing, especially the vibration in the high frequency band. Bearings with high cleanliness have low vibration speed values, especially in high frequency bands. Tests have been made on the influence of dust in needle roller bearing grease on noise, and it is proved that the more dust, the greater the noise.

3.Influence on lubrication performance

The decrease of SKF bearing cleanliness not only affects the formation of lubricating oil film, but also causes the deterioration of the lubricating grease and accelerates its aging, thereby affecting the lubricating performance of the lubricating grease.