Abstract: Aiming at the problem that the transient temperature of the shearer ’ s rocker arm gear system is high and the bonding of the tooth surface is easy,the heat generation characteristics of the idler gears under different ambient temperatures are studied by using the gear mixed elastohydrodynamic lubrication theory and the virtual simulation technique. Based on Reolands viscosity and viscous pressure,Ree-Eyring model and non-Newtonian fluid theory,the effects of gear friction coefficient,gear oil film stiffness and oil film damping and convective heat transfer coefficient on the heat generation efficiency of gear transmission system are considered. ,The formula for calculating the real-time friction coefficient of the tooth surface under the lubrication condition is established. Then,the formula is introduced into the COMSOL Multiphysics mathematical module to obtain the friction coefficient at different initial temperatures. Then,the COMSOL multi-body power The solid-liquid-heat coupling characteristics of the idler gear are analyzed and studied by the module and the solid heat transfer module,The results show that the ambient temperature is in the range of 281. 15-311. 15 K,the temperature of the gear is close to the ambient temperature,the ambient temperature is in- versely proportional to the temperature difference,and the ambient temperature is proportional to the temperature rise.