Oil penetration mechanism induced by different bearing wall grooves

High-speed angular contact ball bearing was used as the research object, and the groove was built on the inner wall of the bearing outer ring. The fluid and dynamics was used to analyze the gas-liquid two-phase flow of high-speed bearing wall groove model. The volume of fluid (VOF) model was applied to dynamically capture gas-liquid two-phase flow between the bearing rings. The movement process and distribution characteristics of lubricating oil under groove induction were analyzed, and the factors influencing the entry of lubricating oil were explored. The influences of groove shape, depth, direction and oil injection parameters on the volume fraction of lubricating oil in the cavity and raceway of high-speed bearings were studied. The research results show that during high-speed bearing injecting, through analysis of groove shape, depth and direction, the circular groove is suitable for high-speed bearings. When the groove depth is 0.8 mm, and the groove direction is 60 degrees, it is beneficial for lubricating oil to enter the bearing ring. The volume fraction of the effective lubricating oil and raceway oil in the cavity is the highest. Finally, the volume fraction of oil between grooved and non-grooved bearing chamber was measured and compared with the simulation results. It was found that the opening of wall grooves in the high-speed stage of bearing was conducive to the entry of lubricating oil, providing a new method for the lubrication design of high-speed bearing.