Evaluation and Verification of Surface Durability of Power Transmission Triboelement Concerning of Micro-and Macro-Configuration

对机械提出了重量轻、结构紧凑、高强度、高可靠性等要求，因此对其进行高可靠性评估和验证以及提高表面耐久性是一个重要的课题。本研究同时考虑冠状等宏观结构和粗糙度、硬度、残余应力分布等微观结构进行了三维接触应力分析，并对表面破坏和耐久性进行了评价。并对不同微观和宏观表面结构的滚子和齿轮副进行了表面失效和耐久性测试和评估。在表面宏观结构方面，研究了冠化对表面耐久性和牵引性能的影响。在不存在边缘载荷或边缘载荷较小的情况下，用法向载荷计算的滚动接触疲劳强度随冠化半径的增大而增大。相反，牵引性能随冠半径的减小而增大。阐明了高滚动接触疲劳强度和牵引性能相结合的最优顶置存在，阐明了动力传动摩擦机部件顶置设计的重要性。对喷丸处理、二次喷丸处理和空穴无喷丸处理后的滚子、齿轮副的微观形貌、硬度分布、残余应力分布和表面粗糙度进行了测试。结合测量到的硬度分布和残余应力分布，通过接触分析得到的应力与硬度之比的幅值可用于评价表面的耐久性和疲劳寿命。

Light weight, compact, high-strength, high-reliability and so on have been required to machines, therefore highly reliable evaluation and verification as well as improvement of surface durability is one of the most important subjects. In this study three dimensional contact stress analyses was conducted in considering of both macro-configuration such as crowning and micro-configuration such as asperity, hardness, and residual stress distributions, and the surface failure and durability were evaluated. The surface failure and durability were also examined and evaluated with rollers and gear pairs with various micro and macro surface configurations.As to surface macro-configuration, the influence of crowning on surface durability and traction performance was investigated. In case that no edge load or minor edge load occurred, the rolling contact fatigue strength evaluated with the normal load increased with increasing crowning radius. On the contrary, the traction performance increased with decreasing crowning radius. It was clarified that the optimal crowning, where both the high rolling contact fatigue strength and the traction performance were combined, exists and the importance of the crowning design of the power transmission tribomachine elements.As to micro-configuration, hardness distribution, residual stress distribution, and surface roughness of rollers and gear pairs with shot-peening, double shot-peening, and some other treatments such as cavitation shotless peening were measured. The amplitude of the ratio of the stress to the hardness obtained by the contact analyses in consideration of hardness distribution and residual stress distribution measured would be suitable for evaluation of the surface durability and the fatigue life.