本文用疲劳剥伤强度理论和弹性流体动压润滑理论(简称弹流理论)对分析国产X62W铣床主轴箱中一对变速齿轮齿面失效的原因,主要在于齿面间没有比形成弹性流体动压润滑,以说明弹流理论在工程实践中的应用。从而提出,在齿轮强度设计中,除考虑齿根弯曲强度外,对于齿面耐火强度,既要考虑齿面疲劳剥伤强度条件,又要考虑弹性流体动压润滑条件,才能保证齿轮的寿命。 In this paper, fatigue failure strength theory and elastic hydrodynamic lubrication theory (referred to as the theory of the Elastohydrodynamic flow) to analyze the failure of a pair of transmission gear tooth flanks in the domestic X62W milling machine spindle box main reason is that there is no more than the formation of elastic fluid dynamic pressure Lubrication to illustrate the application of the theory of Elastohydrodynamics in engineering practice. Therefore, in the design of gear strength, in addition to consider the root bending strength, for the tooth surface fire resistance, it is necessary to consider the tooth surface fatigue strength conditions, but also consider the elastic hydrodynamic lubrication conditions, in order to ensure the life of the gear.