The impact sound of rolling elements and its control methods. When larger models of ball bearings or tapered roller bearings operate at low speeds under pure radial loads, due to the small centrifugal force of the rolling element, the rolling element in the non load zone will impact the cage or raceway and emit noise. But as the speed increases, this sound will disappear. The control methods for the impact sound of rolling elements include reducing the radial clearance appropriately and using bearings with reasonable structures and flexible materials for retaining frames.

Rolling sound of bearings and its control methods Rolling sound is a harsh metal friction sound that can occur in cylindrical roller bearings in all situations, mostly in larger types of bearings lubricated with grease. It is more likely to occur in lubricating grease with degraded base oil performance and rarely occurs in oil lubrication.

First of all, if the structure is reasonably designed and progressiveness, the tapered roller bearing will have a longer life. The manufacturing of bearings generally involves multiple processing steps such as forging, heat treatment, turning, grinding, and assembly. The rationality, progressiveness and stability of each processing technology will also affect the service life of bearings. The heat treatment and grinding processes that affect the quality of finished bearings are often more directly related to the failure of bearings. In recent years, research on the deterioration layer on the working surface of bearings has shown a close relationship between grinding technology and bearing surface quality.

The metallurgical quality of bearing materials was once the main factor affecting the early failure of tapered roller bearings. With the advancement of metallurgical technology, such as vacuum degassing of bearing steel, the quality of raw materials has been improved. The proportion of raw material quality factors in bearing failure analysis has significantly decreased, but it remains one of the main influencing factors of bearing failure. Proper material selection is still a factor that must be considered in bearing failure analysis.

The main task of bearing failure analysis is to identify the main factors causing roller bearing failure based on a large amount of background materials, analysis data, and failure forms, in order to propose targeted improvement measures, extend the service life of bearings, and avoid sudden early failure of bearings.