【作者】 张晶；

【导师】 刘文涛；

【作者基本信息】 哈尔滨工业大学 ， 机械设计及理论， 2013， 硕士

【摘要】 随着科技的发展，航空新型发动机要满足长留空时间、高可靠性、过载耦合和冲击、断电冲击的要求，电磁轴承可基本满足要求，但是在过载和断电的情况下，电磁轴承将失去其部分或全部承载性能，造成发动机停转，这对航天发动机来说是毁灭性的灾难，目前常用的解决方法是设计一对作为冷备份使用的辅助轴承。论文首先根据辅助轴承的要求，考虑辅助轴承的关键技术，对辅助轴承的材料、润滑方式及结构形式进行了选择，然后通过将拟动力学分析和热分析相结合的方式对6206轴承的所有参数重新进行设计，分析了各参数变化对轴承运动和热的影响以及出现这种影响的原因，继而通过综合分析确定了辅助轴承内部结构参数，使重新设计的轴承在既定工况下能达到最佳的工作状态。在此基础上对轴承在过载和断电两种工况下各滚动体与内外圈的接触载荷、接触应力、旋滚比以及保持架打滑率进行了仿真分析，对轴承的寿命进行了预测。考虑到断电情况下会存在20kN的冲击，因此对各滚动体的质心运动、保持架兜孔与滚动体之间的冲击也进行了仿真分析，结果表明冲击对轴承造成的影响完全处于轴承所能承受的极限范围内。针对高温、高速、自润滑的工作特点和结构要求，论文分析了可能用于高温润滑的自润滑材料，最终选定了二硫化钨，进而根据具体工况参数完成了二硫化钨薄膜摩擦学实验分析工作，结论表明二硫化钨在高温情况下的摩擦学性能抗氧化性能都要好于已得到广泛应用的自润滑材料，如二硫化钼、DLC等。为二硫化钨的研究提供了理论依据。更多还原

【Abstract】 With the development of technology, aeroengines should to satisfied the requirements of long flying time, high reliability, heavy caused by overload and power off. Although the electromagnetic bearings could satisfied the requirements of long flying time and high reliability, it will lose bearing capacity and cause the engine to out of work, which is the devastating disaster of the aeroengine, while the overload or power off happened. Application of auxiliary bearings is the common solution to provide the overloads and power off.According to the requirements and the key technologies of auxiliary bearing,the design scheme,including bearing materials, lubrication and structures, was selected in this paper. And then, all of the bearing parameters were designed considering the dynamics and thermal analysis for6206bearing, and the comprehensive analysis was achieved to get the best working conditions. On the condition of overloads and power off, the contact force and pressure between rolling element and rings, the ratio of revolution to rolling and the slide ratio of cage were analyzed. Meanwhile, the bearings life were calculated. Considering the impact of20kN on the condition of power off, the mass center motion of rolling element, impacts between cage pockets and rolling elements were analyzed, and the results shown that the impact on the bearings is not pass the loads capacity limit of that auxiliary bearings.According to the working characteristics of high-temperature, high-speed, self-lubricating and the structural requirements, several lubrication materials were researched and WS2is selected finally. The tribological experiments of WS2film is finished based on the detail working conditions. The results indicate that the tribological properties and character of oxidation resistance both are better than that of other widely-used self-lubricating materials such as MoS2, DLC and so on.更多还原