航空面齿轮乏油运行寿命机制及齿面微观创成方法研究

面齿轮的独特分流特性使其正逐步替代螺旋锥齿轮而成为武装直升机传动系统中最重要的核心零件，失油状态下面齿轮的运行寿命一直为武装直升机设计者和使用者所关注。本项目从武装直升机极端使役性能要求出发，以改善失油状态下面齿轮的润滑性能和延长运行寿命为目标，综合运用面齿轮啮合原理、摩擦学、传热学、赫兹接触理论和有限元分析方法，对面齿轮失油状态下各个阶段失效机制、润滑膜时变特性进行分析，获得沿啮合线中心油膜厚度、压力、温度以及轮齿表面摩擦系数等相关参数的分布规律。通过对面齿轮轮齿表面微观造型的几何特征与物理特征相关性分析，建立具有微观造型表面的面齿轮啮合润滑理论模型，分析表面微观造型参数对面齿轮啮合润滑性能的影响，同时结合实验研究，探求失油后使得残余润滑油尽可能长时间粘附在齿面上的表面微观造型设计与控制方法，以延长失油状态下面齿轮乏油运行寿命，为提高我国航空面齿轮失油状况下的运行能力提供理论指导。

Face gear is replacing the spiral bevel gear gradually and becomes the most important key component in the driven system of armed helicopter because of its special split-flow characteristic. The service life of face-gear under oil-out condition is always paid close attention by the designer & user of armed helicopter. This study, from extreme using performance requested by armed helicopter, aiming at improving face-gear lubricating property and prolonging service life under oil-out condition, with comprehensive application of face-gear meshing theory, tribology, heat transfer theory, Hertz contact theory and finite element method, analyzes face-gear's failure mechanism at each stage and Time-Varying characteristics of lubricant film under oil-out condition to achieve the distribution law of relative parameters, such as oil film thickness, pressure, temperature and surface friction coefficient etc. along with the center of meshing line. By the analysis of relativity of geometrical and physical characteristics of micro-morphology on the tooth surface, it establishes a theoretical model with surface micro-morphology of face-gear in meshing with lubricating oil to analyze the effects of parameters of surface micro-morphology on lubrication performance of face-gear meshing . In addition,with the experimental study , it seeks after design and control method of surface micro-morphology which helps to make residual lubricating oil adhere to tooth surface as long as possible to prolong service life of face-gear underoil-out condition, which provides theoretical guidance for improving operation capacity of aeronautical face-gear under oil-out condition in our country.