基于微造型的发动机滑动轴承摩擦学性能研究

发布时间：2018-03-22 19:38

本文选题：微造型　切入点：发动机滑动轴承　出处：《重庆大学》2012年硕士论文　论文类型：学位论文

【摘要】：在滑动轴承表面进行微造型以改善其摩擦学性能是国际上刚刚兴起的方法。研究微造型滑动轴承的摩擦学性能，能为滑动轴承的设计提供新的思路，，从而提高发动机滑动轴承乃至整个发动机的性能。因此，基于微造型的发动机滑动轴承摩擦学性的研究具有一定的理论研究与实际应用价值。本文针对雷诺方程求解表面微造型动压润滑问题的局限性，采用了N-S方程，对微造型径向滑动轴承进行了流体动力学分析，研究了表面微造型对滑动轴承润滑性能的影响，并对微造型的几何参数、布局参数以及形状类型进行了优化，最后对干摩擦状态下的微造型轴承进行了接触分析。论文主要研究内容如下： ①对不同偏心率，不同转速下的微造型轴承进行了分析。计算结果表明：合适的微造型可以增加轴承的油膜最大压力和承载能力、减小其摩擦系数；在低偏心率下，微造型轴承产生的附加动压效应更加明显； ②分析了微造型的几何尺寸以及布局对轴承润滑性能的影响。分析结果表明：适当减小微造型的深度或长度、增加微造型的宽度，有利于增加轴承的油膜最大压力和承载能力、减小轴承的摩擦系数；存在使得轴承承载能力最大或摩擦系数最小的最优微造型布局密度或布局面积；在油膜最大压力附近布置微造型，更有利于增加轴承承载能力、减小轴承的摩擦系数； ③从沟槽微造型和坑状微造型这两个角度研究了不同几何类型的微造型对轴承润滑性能的影响。计算结果表明：不同类型的微造型对轴承润滑性能的影响有所差异；相比于矩形和梯形沟槽微造型，半球形和三角形沟槽微造型更有利于增加轴承的油膜最大压力和承载能力、减小轴承的摩擦系数；相比于矩形和三角形坑状微造型，半球形和圆柱形坑状微造型更有利于增加轴承的承载能力、减小轴承的摩擦系数； ④利用有限元方法，对不同载荷、不同摩擦系数下的微造型轴承进行了接触分析，并讨论了微造型的几何尺寸、密度以及形状对轴承接触性能的影响。计算结果表明：微造型会增加轴承的最大等效应力、最大接触应力和最大接触变形；增加微造型的宽度、密度会增加轴承的最大等效应力、最大接触应力和最大接触变形；不同类型微造型轴承的接触性能有所差异。
[Abstract]:In order to improve the tribological properties of sliding bearings, it is a new method to improve their tribological properties on the surface of sliding bearings. The study of tribological properties of microsculpt sliding bearings can provide a new way of thinking for the design of sliding bearings. Therefore, the tribological research of engine sliding bearing based on micro-modeling has certain theoretical research and practical application value. Aiming at the limitation of solving the dynamic lubrication problem of surface micro modeling by Reynolds equation, the N-S equation is used to analyze the hydrodynamics of micro shaped radial sliding bearing, and the influence of surface micro modeling on lubricating performance of journal bearing is studied in this paper. The geometric parameters, layout parameters and shape types of micro-modeling are optimized. Finally, the contact analysis of micro-modeling bearings under dry friction is carried out. The main contents of this paper are as follows:. The results show that the suitable micro molding can increase the maximum pressure and bearing capacity of the oil film and reduce the friction coefficient of the bearing under the condition of low eccentricity, low eccentricity, low eccentricity, low eccentricity, low eccentricity, low eccentricity, low eccentricity, and low eccentricity. The additional dynamic pressure effect is more obvious. 2. The influence of geometry size and layout of micro molding on bearing lubrication performance is analyzed. The results show that reducing the depth or length of micro molding properly and increasing the width of micro molding are beneficial to increase the maximum pressure and bearing capacity of the bearing oil film. Reducing the friction coefficient of the bearing, the existence of the optimal micromodeling layout density or layout area that makes the bearing bearing capacity maximum or the minimum friction coefficient, and the arrangement of the micro-molding near the maximum pressure of the oil film is more conducive to increasing bearing bearing capacity. Reducing the friction coefficient of the bearing; (3) the influence of different geometric types on the lubrication performance of bearings is studied from the angles of grooving and crater micromodeling. The results show that the effects of different types of micro-modeling on the lubricating properties of bearings are different. Compared with rectangular and trapezoidal grooves, hemispherical and triangular grooves are more advantageous to increase the maximum oil film pressure and bearing capacity of bearings and reduce the friction coefficient of bearings. The hemispherical and cylindrical craters are more favorable to increase bearing capacity and reduce the friction coefficient of bearings. (4) the contact analysis of the bearing with different load and friction coefficient is carried out by using the finite element method, and the geometric dimensions of the micro modeling are discussed. The results show that the maximum equivalent stress, the maximum contact stress and the maximum contact deformation of the bearing are increased by the micro-molding, and the width of the micro-molding is increased by the influence of the density and the shape on the contact performance of the bearing. The density will increase the maximum equivalent stress, maximum contact stress and maximum contact deformation of the bearing, and the contact performance of different types of micro-shaped bearings will be different.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.3;TH117

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