基于确定性模型的渐开线齿轮混合润滑分析

发布时间：2018-07-04 17:42

本文选题：齿轮传动 + 混合润滑　；参考：《南京航空航天大学》2011年硕士论文

【摘要】：诸如齿轮、滚动轴承等高副接触,因受载接触变形发生在很小的面积上,导致接触区压力极高。研究这类接触的润滑机理,既需考虑接触表面的弹性变形,也需考虑其间的润滑剂粘度变化。综合考虑以上两种效应的动力润滑理论称为弹性流体动力润滑(Elastohydrodynamic Lubrication)。大部分的齿轮传动工作在微凸体接触与流体润滑共存的混合润滑状态下。本文分析了从光滑表面-粗糙表面接触、全膜润滑-部分膜混合润滑、线-点接触等弹流润滑一系列问题,最终建立了渐开线齿轮混合润滑确定性模型,主要内容包括: 分别对线、点接触光滑表面接触建立弹流润滑数学模型,编制程序进行数值求解,得出了流体压力和膜厚分布,得到了二次压力峰、出口区“颈缩”现象以及点接触油膜的“马蹄形”特征。利用三种直接迭代解法,对等温瞬态粗糙表面弹流润滑问题进行数值求解,给出了粗糙度影响下全膜润滑的压力和膜厚分布,并比较了各直接迭代解法的优劣。对齿轮进行几何参数以及运动学简化,在国内首次建立了渐开线直齿轮混合润滑线接触确定性模型。将整个齿轮传动啮合过程作为一个分析周期,分成多个瞬时并加以连续求解,得到了齿轮传动啮合线上各啮合点的压力、膜厚分布。针对光滑表面接触、考虑粗糙度的全膜润滑和混合润滑等不同接触状态进行了最大压力、最小膜厚比较,指出了压力最大值以及油膜破裂危险点,并考察了功率、转速对最大压力、最小膜厚的影响。建立了修形齿轮点接触混合润滑确定性模型,对啮合过程中各啮合状态转化点分别进行稳态数值求解,得到了最大压力、最小膜厚沿啮合线的分布规律。
[Abstract]:Such as gear, rolling bearing and other high contact, because the load contact deformation occurs on a very small area, resulting in contact area pressure is extremely high. In order to study the lubrication mechanism of this kind of contact, the elastic deformation of contact surface and the variation of lubricant viscosity should be considered. The dynamic lubrication theory considering the above two effects is called Elastohydrodynamic Lubrication. Most gear drives work in a mixture of microconvex contact and fluid lubrication. In this paper, a series of problems in elastohydrodynamic lubrication, such as smooth surface-rough surface contact, total film lubrication-partial film mixed lubrication, line-point contact, etc., are analyzed. Finally, a deterministic model of mixed lubrication for involute gears is established. The main contents are as follows: the mathematical model of elastohydrodynamic lubrication is established for the smooth surface contact of line and point contact, the numerical solution is compiled, the distribution of fluid pressure and film thickness is obtained, and the secondary pressure peak is obtained. The "necking" phenomenon in the outlet area and the "horseshoe" characteristics of the point contact oil film. The elastohydrodynamic lubrication problem of isothermal transient rough surface is numerically solved by using three direct iterative methods. The pressure and film thickness distribution of the whole film lubrication under the influence of roughness are given, and the advantages and disadvantages of each direct iterative method are compared. The geometric parameters and kinematics of gears are simplified, and the contact deterministic model of involute spur gears with mixed lubrication line is established for the first time in China. The whole meshing process of gear transmission is taken as an analytical period, and it is divided into several instantaneous moments and solved continuously, and the pressure and film thickness distribution of each meshing point on the gear transmission meshing line are obtained. For smooth surface contact, the maximum pressure and the minimum film thickness are compared in different contact states, such as full film lubrication and mixed lubrication, considering roughness. The maximum pressure and the danger point of oil film rupture are pointed out, and the power is investigated. The effect of rotational speed on maximum pressure and minimum film thickness. The deterministic model of modified gear point contact mixed lubrication is established. The steady state transition points of meshing state are solved numerically respectively. The distribution of maximum pressure and minimum film thickness along the meshing line is obtained.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH117.2;TH132.41

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