汽车发动机连杆及轴瓦的分析及计算

机械论文编号:JX861  论文字数:18105.页数:43   附CAD图

目录
 中文摘要 I
英文摘要 II
第一章  绪  论 1
1.1 研究动机与目的 1
1.2 研究背景 1
1.4 论文内容概述 3
第二章  连杆及轴瓦的布置 4
2.1连杆 4
2.1.1 连杆的功用及工作条件 4
2.1.2 连杆构造 4
 2.2 轴瓦 6
2.2.1 连杆轴瓦的工作条件 6
 2.2.2 连杆轴瓦的功用 6
2.2.3 连杆轴瓦的组成 6
第三章  连杆组设计 7
3.1 连杆材料 7
3.2 连杆长度的确定 7
3.3 连杆小头结构设计 8
3.4 连杆杆身结构设计 8
 3.5 连杆大头结构设计 9
 3.6 连杆的受力分析 10
 3.6.1 连杆的三维模型 10
 3.6.2 位移边界条件和载荷处理 11
 3.6.3 有限元计算结果 17
 3.7 连杆疲劳强度校核 18
 3.7.1 连杆在最大压力情况下疲劳强度校核 19
 3.7.2 连杆在最大拉力情况下疲劳强度校核 19
 3.8 连杆结构优化 20
第四章  连杆轴瓦设计 24
 4.1 轴瓦材料 24
 4.2 轴瓦的结构设计 24
 4.2.1 轴瓦表面的几何形状 25
 4.2.2 轴承宽度和油槽 25
 4.2.3 定位与安装 28
 4.3 轴瓦的受力分析 29
 4.3.1 轴瓦的有限元模型 29
 4.3.2 轴承座厚度的确定 30
 4.3.3应力分布 32
第五章  总 结 34
参考文献 36
致     谢 37

摘     要
    连杆是汽车发动机中的重要零件，它连接着活塞和曲轴，其作用是将活塞的往复运动转变为曲轴的旋转运动，并把作用在活塞上的力传给曲轴以输出功率。连杆在工作中，除承受燃烧室燃气产生的压力外，还要承受纵向和横向的惯性力。连杆多为钢件，其主体部分的截面多为圆形或工字形，两端有孔，孔内装有青铜衬套，供装入轴销而构成铰接。
本文主要研究发动机连杆及轴瓦的组成，各零部件的结构和功用，并完成4102发动机连杆及其轴瓦主要零部件的分析与计算。我们主要以连杆小头、连杆杆身、连杆大头、轴瓦等零部件为例来设计并分析计算，从设计要求、结构尺寸、材料选择、受力分析等几方面来完成。同时，还运用AutoCAD和Ansys技术，画出连杆总成装配图以及各零部件图和应力分布图。
关键词：连杆 轴瓦 分析 计算

Automobile engine connecting rod and bearing
 analysis and calculation

Abstract
    Linkage is an important automotive engine parts, it is connected to the piston and the crankshaft, its role is to thereciprocating piston movement into rotary movement of thecrankshaft, and the role of the force in the piston to thecrankshaft to the output power. Link at work, in addition to gasproduced by the combustion chamber under pressure, also have toface the vertical and horizontal inertia force. Connecting rod for steel parts, the main part of the crosssection for the round or shaped, both ends have a hole or holeswith needle bearing bronze bushing for the pin into and constitutea hinged axis.
 This paper studies the composition of the engine connecting rod and bearing, all parts of the structure and function, and complete the 4102 engine connecting rod and bearing the major components of the analysis and calculation. We mainly connecting rod small end, connecting rod shaft, connecting rod, bearings and other components to design and analyze an example calculation, from the design, structure, size, material selection, stress analysis and other aspects to complete. The same time, the use of AutoCAD and Ansys technology, draw the connecting rod assembly shop drawings, as well as parts diagram and stress distribution.
Keywords：Rear bumper; Hut runner system;Design