内齿圈的轮缘柔性会显著影响行星传动在轮齿啮合层面和系统功率分流层面上的力学性能，是决定大型航空行星系统服役可靠性水平的关键设计因素之一。为了分析内齿圈的轮缘柔性对行星系统疲劳可靠性的影响方式及程度，在应力-强度干涉理论框架下，基于全概率公式计算原理构建了行星系统可靠性评估模型，并利用集中质量有限元法和轮齿概率寿命转化试验分别为可靠性模型提供载荷和强度输入变量。最终，建立了从轮缘厚度到行星系统可靠性指标的映射关系，准确地确定了在质量约束下可靠性增益效果最优的内齿圈轮缘厚度尺寸，为大型航空行星系统的疲劳可靠性设计提供了技术储备。
The flexibility of the ring gear plays a crucial role in the mechanical properties of planetary transmission. It affects both the tooth meshing level and the system power split level, making it one of the most important design factors in ensuring the service reliability of large aerospace planetary mechanisms. In order to analyze the way and extent to which the rim flexi-bility of the ring gear affects the fatigue reliability of the planetary system. In this study, a planetary system reliability as-sessment model is developed using the stress-strength interference theory and the full probability formula calculation. The model incorporates load and strength input variables obtained through the lumped mass finite element method and probabilistic life transformation test of the gear teeth. Finally, the mapping relationship between rim thickness and the reli-ability index of the planetary system is established, and the thickness range of the ring gear rim with the best reliability gain effect under the mass constraint is accurately determined, which provides a technical reserve for the fatigue reliabil-ity design of large aviation planetary systems.
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