建立某无人机用小型涡喷发动机减速器齿轮三维有限元模型,把发动机主轴的载荷谱转化为齿轮载荷谱,基于接触分析模型,得到一个啮合周期下的应力变化,应用S-N曲线,估计了该发动机减速器齿轮啮合疲劳寿命。这种基于有限元分析的齿轮啮合疲劳分析,为该齿轮副优化设计提供理论依据,也为其它齿轮的疲劳分析提供借鉴。 A three-dimensional finite element model of gearbox for a small turbojet engine was established. The load spectrum of the engine spindle was transformed into the gear load spectrum. Based on the contact analysis model, a stress change during the meshing period was obtained. Using the SN curve, The engine reducer gear meshing fatigue life. The gear meshing fatigue analysis based on the finite element analysis provides a theoretical basis for the optimal design of the gear pair and provides references for the fatigue analysis of other gears.