What impact does slewing bearing cleanliness have on bearings?
Due to the relative movement of the rotating body and the raceway and the intrusion of pollutants and dust, the surfaces of the rotating body and the raceway are worn. When the amount of wear is large, the bearing, noise, and vibration increase, which reduces the operating accuracy of the bearing, thus directly affecting the accuracy of some main engines. 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 impact 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 its service life. Tests by others have shown that lubricants with different cleanliness have a great influence on the service life of ball bearings. Therefore, improving the cleanliness of lubricating oil can extend the life of the bearing. In addition, if the dirt particles contained 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 cleanliness seriously affects the vibration level of the bearing, especially the vibration in the high frequency band is more obvious.
Bearings with high cleanliness have low vibration speeds, especially in high frequency bands. Tests have been conducted on the impact of dust in needle roller bearing grease on noise, and it has been confirmed that the more dust, the greater the noise.
3. Impact on lubrication performance The decrease in bearing cleanliness not only affects the formation of the lubricating oil film, but also causes the deterioration of the grease and accelerates its aging, thereby affecting the decrease in the lubrication performance of the grease.
