摘要柴油机连杆组在工作中承受着复杂的载荷，这对连杆组的机械性能有很高的要求， 因此连杆应拥有可靠的抗疲劳强度和结构强度，而且连杆的质量应尽可能的轻来减少惯 性力对连杆工作过程产生的影响。运用传统设计不能达到连杆轻且可靠的要求，用传统 解析法对连杆的应力以及应变情况分析，分析结果误差较大,因此本文运用了较为先进 的有限元分析方法对连杆进行设计计算。

本文先在 Pro/E 里建立包括连杆衬套、活塞销、轴瓦在内的连杆组装配三维实体模 型，然后导入 ANSYS 中，因为部件之间的接触关系和装配预紧力，在 ANSYS 中运用传统 静力学原理对连杆的装配工况、最大拉伸和最大压缩工况，进行精细三维接触有限元分 析计算。获得各工况下连杆组的应力分布和变形情况，对连杆的可靠性进行验证，并对 连杆的疲劳强度进行校核。接着在 ANSYS 中利用其自带的优化语言对连杆的杆身进行优 化设计。80793

对连杆组优化设计的目的是：在保证足够的刚度、强度和稳定性下，最大化的达到 体积小、质量轻、形状合理，且尽可能地减少过渡区的应力集中。这些分析计算会为继 续研究 4V-105 型柴油机连杆组的动态性能以及深层优化连杆大小端提供较价值的依 据。这样可以减少实验验证过程，减短开发周期，减少设计成本，提高设计效率。

毕业论文关键词：连杆组；有限元 ；ANSYS ；优化设计；分析计算

Abstract Diesel engine connecting rod group at work under complex loads, the mechanical properties of connecting rod group have very high requirements。 Therefore, the  connecting rod should have reliable anti fatigue strength and structural strength and the influence of link quality should be as light as possible to reduce the inertial force produced in the working process of the connecting rod。 Use traditional design can not meet the requirement of connecting rod light and reliable, with the traditional analytical method of connecting rod should stress and strain analysis of the error larger。

In the Pro / e established including rod bushing, piston pin, connecting rod  bearing, group assembly 3D solid model, and then imported into ANSYS because the contacts and relations between components Reasonable used to verify the reliability of connecting rod assembly pretightening force, the use of traditional statics of connecting rod assembly condition, the maximum tensile and compression condition, fine 3D contact finite element analysis calculation。 The conditions of stress distribution and deformation of the connecting rod, and the connecting rod fatigue strength is checked。

The linkage optimization design is to ensure enough stiffness, strength and stability, the maximum to the size of small, light weight, shape, and as far as possible to reduce the transition zone of stress concentration。 The analysis and calculation for continued research of 4V-105 diesel engine connecting rod group, the dynamic performance and the deep optimization of connecting rod Provide the small end is based on the  value  of。 This can reduce the experimental validation process, shortening the development cycle, reduce design cost, improve the design efficiency。

Key Words： Connecting rod group ；Finite element ； ANSYS ； Optimization and Design  ；Calculation and Analysis

目录

第一章 绪论 1

1。1  柴油机连杆组设计计算的意义 1

1。2  连杆组设计计算的国内外现状 1

1。3  连杆组设计计算的具体内容 2

第二章 连杆组有限元模型的建立