本文运用流体的非牛顿热弹流理论对齿轮接触表面的正压力,剪应力,温度分布和油膜形状进行了完全数值计算。并且得到了轮齿次表层最大当量应力随滚动速度及滑一滚率变化的规律。作者第一次成功地从理论上证明了齿面疲劳失效最易出现在滑一滚率小的节点附近这样一种现象。此外,本文的分析及结果对于更合理地选择齿面硬化参数。提高齿轮的接触强度亦具有指导性意义。 In this paper, the fluid non-Newtonian thermo-elastic flow theory is used to calculate the normal pressure, shear stress, temperature distribution and oil film shape on the contact surface of gear. The law of the maximum equivalent stress of the subsurface of the gear with the rolling speed and the slip-rolling rate was obtained. For the first time, the author succeeded in theoretically proving that the fatigue failure of tooth flanks is most likely to occur near the node with a small slip-roll rate. In addition, the analysis and results of this paper are more suitable for the selection of tooth-surface hardening parameters. It is also instructive to improve the contact strength of gears.