The lubrication of bearings is to enable the bearings to operate normally, avoid direct contact between the raceways and rolling body surfaces, reduce friction and wear inside the bearings, prolong the service life of the bearings, enhance the performance of the bearings, and also prevent rust and corrosion due to the intrusion of foreign matter inside the bearings. This article describes the 11 lubrication methods commonly used in bearings, I hope it will help you in your work and study.