The thrust cone can offset the axial force generated by helical gear meshing,simplify the gearbox structure and improve the transmission efficiency.However,the inclination of the thrust cone rotor axis caused by manufacturing and assembly seriously deteriorates the lubrication performance of the thrust cone.In order to study the influence of rotor axis inclination on the lubrication performance of thrust cone and the method to improve the lubrication performance of thrust cone,an analytical model of thrust cone point contact thermal elastohydrodynamic lubrication considering axis inclination and local modification of cone surface was established.The effects of axis inclination and modification parameters on its lubrication performance under typical working conditions were studied.The results show that with the increase of rotor axis slope,the minimum oil film thickness decreases significantly,and the minimum oil film thickness after rounding at both ends of the cone increases significantly.Under the condition of serious axis inclination,the minimum oil film thickness after cone modification increases by 150%.Through optimization analysis of modification parameters,it is found that the proportion of thrust cone modification width should be 0.2 to 0.35,and the modification depth should be 2 μm to 8 μm under the typical working conditions.This research has certain engineering reference value for the design and optimization of thrust cone.