【作者】 李超；

【导师】 王优强；

【作者基本信息】 青岛理工大学 ， 机械设计及理论， 2011， 硕士

【摘要】 本文针对渐开线直齿圆柱齿轮，通过建立表面微点蚀坑和表面微凸起数学模型，应用多重网格法和多重网格积分法，充分考虑到非牛顿流体的时变效应、热效应，以及工作材料的表面磨损现象，重点求解了齿轮啮合过程中的热弹流润滑数值解。具体内容包括四部分：表面微点蚀单坑对渐开线直齿圆柱齿轮热弹流润滑的影响；表面连续微点蚀坑对渐开线直齿轮热弹流润滑的影响；渐开线直齿轮表面磨损的热弹流润滑数值分析；动载荷作用下的连续冲击对齿轮热弹流润滑的影响分析。首先，根据渐开线直齿轮的几何和运动关系，在齿面上考虑有一单个微点蚀坑，建立了渐开线直齿轮的非牛顿时变热弹流润滑模型；应用多重网格技术，通过改变微点蚀坑的弧度及坑深得到了不同形貌的凹坑，模拟微点蚀初期的发展过程，得到了单个微点蚀坑作用下的渐开线直齿圆柱齿轮啮合全过程时变热弹流润滑的完全数值解。其次，考虑齿面上存在有连续微点蚀坑现象，求得了齿轮啮合过程的热解，分析了微点蚀坑对齿轮的润滑作用效果；通过改变功率大小来间接改变载荷大小，研究了载荷对表面存在连续微点蚀坑的渐开线直齿轮的热弹流润滑的影响。然后，在以往表面粗糙度的研究基础上，对两齿面表面微凸起在不同磨损程度下的热解进行了数值分析，求解了两齿面间表面微凸起磨损程度相同时的油膜压力、膜厚、温升以及摩擦系数等；对两齿面磨损程度不一致时沿啮合线的油膜的中心压力和膜厚变化、几个特殊啮合点的压力和膜厚的变化进行了对比分析。最后，在啮合过程中加入了动载荷作用下的连续脉冲冲击，改变冲击波的脉冲频率和脉冲幅值，求解了啮合过程中连续冲击作用下的完全数值热解。更多还原

【Abstract】 The model of the gear microscopic surface pitting and embossing are set up in thisthesis, and based on the multi-grid (MG) method and the multi-level multi-integration(MLMI) method, many influence factors such as transient effects, thermal effects andsurface wear of the material are considered in the model, selective analysis the thermalEHL numerical solution during the meshing process. The thesis mainly includes theseparts: the influences of a single microscopic surface pitting on the thermal EHL ofinvolute spur gear; the influences of continuous microscopic surface pitting on thermalEHL of involute spur gear; the transient thermal EHL of the wear of surface embossingof involute spur gear; the influences of continuous impact under the effects of dynamicload on the thermal EHL of involute spur gear.Firstly, according to relationship of the geometric and transmission of the involutespur gear, a transient thermal EHL model of the involute spur gear has been establishedby the considering of a microscopic pitting on the gear surface. Based on the multi-gridmethod, by changing the curvature of a micro-pit and the depth of the pit to get differenttopography, then an absolutely thermal EHL numerical solution of involute spur gear isobtained during the meshing process along the contact line.Secondly, considering the continuous microscopic surface pitting phenomena ofthe gear surface, a complete thermal solution of it’s meshing overall process has beenobtained, then analyze it’s effect on the gear lubrication action. By changing the powerto change the load pressure of the two meshing gears, in order to research the influenceof irregular impact load and inherent load of two meshing gears that is cased bymicroscopic pitting.Thirdly, based on the previous research of surface roughness, a numerical analysisof thermal solution of the two meshing gears in different degree of wear is solved, suchas the central film pressure、film thickness、peak temperature rise and friction coefficientalong the contact line when each of the two meshing gears in similar degree wearing,and compare the change of central film pressure and thickness along the contact lineand so do the several particular meshing points.Lastly, a continuous impulse impact is added in the meshing process. By changing the impulse frequency and the impulse amplitude, get the absolutely numerical solutionunder the continuous impact during the contact line of meshing.更多还原