Gear drives are widely used in mechanical driving devices, and the heating problem of gear has been paid much attention. The tooth surface temperature field of spur/helical gear is compared and thermal characteristic of spur/helical gear is studied in this paper. The calculation formula of frictional heat flux and convective heat transfer coefficient, which considers different surfaces of gear tooth, is derived. The frictional heat flux of the helical gear is different from that of the spur gear, and the calculation method is different. The finite element parametric model for thermal analysis is built and it realizes the automatic parametric modeling, loading, and generation of temperature field by ANSYS parametric design language (APDL) program. The influence of different parameters on gear temperature rise is analyzed and the distribution of the three-dimensional (3D) temperature field of spur/helical is obtained. The simulation analysis and experiment are compared to validate the accuracy of thermal analysis results. The research result reveals the distribution law of the 3D temperature field of spur/helical gear transmission at different working parameters. It provides theoretical guidance for gear antiscuffing capability and gear optimization design.

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