表面微点蚀及表面磨损对渐开线直齿轮热弹流润滑的影响研究

发布时间：2018-06-16 23:19

本文选题：微点蚀坑 + 微凸起　；参考：《青岛理工大学》2011年硕士论文

【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。
[Abstract]:In this paper, for involute spur gears, by establishing mathematical models of surface micro-pitting pits and surface micro-protrusions, using multi-grid method and multi-grid integration method, the time-varying and thermal effects of non-Newtonian fluids are fully considered. The numerical solution of thermo-elastohydrodynamic lubrication during gear meshing is mainly solved. The specific contents include four parts: the influence of surface micropitting single pit on thermal elastohydrodynamic lubrication of involute spur gear, the effect of surface continuous micro-pitting pit on thermal elastohydrodynamic lubrication of involute spur gear, and the influence of surface micropitting pit on thermal elastohydrodynamic lubrication of involute spur gear. The surface wear of involute spur gear is numerically analyzed by thermo-elastohydrodynamic lubrication, and the influence of continuous impact on the thermo-elastohydrodynamic lubrication of involute spur gear is analyzed. Firstly, according to the geometry and motion relationship of involute spur gear, a single micro-pitting pit is considered on the tooth surface, and a non-uniform thermo-elastohydrodynamic lubrication model of involute spur gear is established. By changing the arc and depth of the micro-pitting pit, the pits with different morphologies are obtained, and the development process of the micropitting initial stage is simulated. A complete numerical solution of involute spur gear meshing with time-varying thermal elastohydrodynamic lubrication under the action of a single micro-pitting pit is obtained. Secondly, considering the existence of continuous micro-pitting on the tooth surface, the pyrolysis of gear meshing process is obtained, the lubricating effect of the micro-pitting pit on gear is analyzed, and the load size is indirectly changed by changing the power. The effect of load on thermo-elastohydrodynamic lubrication of involute spur gears with continuous micro-pitting pits on the surface was studied. Then, on the basis of the previous research on surface roughness, the pyrolysis of micro-protrusions on two tooth surfaces under different wear degrees is analyzed, and the oil film pressure and film thickness are solved when the wear degree of micro-protrusions between two tooth surfaces is the same. The variation of the central pressure and thickness of the oil film along the meshing line and the variation of the pressure and thickness of the film at several special meshing points when the wear degree of the two tooth surfaces is different is analyzed. Finally, continuous pulse shock under dynamic load is added in the meshing process, the pulse frequency and pulse amplitude of the shock wave are changed, and the complete numerical pyrolysis under the continuous impact during meshing process is solved.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.413

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