Abstract: Based on principles of gear meshing， 3D parametric finite element model of the involute gear was built using the ANSYS parametric design language (APDL). The finite element model of single gear tooth body temperature was established， and then the bulk temperature field of gear tooth was obtained by the ANSYS， on the basis of heat transfer and friction theories. Taking the temperature distribution as the temperature load of the gear， thermal deformation was calculated by the maximum amount of modification for an involute tooth profile. Besides， the maximum amount of modification in terms of the force load on the gear was also calculated according to empirical formulas. Finally， the modification curve equation was revised through thermoelastic coupling analysis combined with the modification theory and then verified through the ANSYS contact analysis.

Key words: involute tooth profile, gear profile modification, thermoelastic coupled analysis, contact analysis, finite element