The movement of a pair of reducer gears is completed by a pair of tooth surface meshing movement. The relative movement of a pair of smooth tooth surfaces also includes rolling and sliding. For the gear that transmits power, the force and force of the gear should be studied. Deformation. Need to apply the knowledge of mechanics. There is lubricating oil between the two tooth surfaces of the gear, and the knowledge of fluid mechanics is involved. If the surface film formed by the interaction between the lubricant and the gear surface is studied, knowledge of physics and chemistry is required. Therefore, under the condition of lubricant, the existence of lubricant must be considered in order to truly and comprehensively reflect the kinematics and dynamics of gear transmission. The gear design of Jiren Lubricant is a more comprehensive and perfect gear design.