汽車發動機連桿及軸瓦的分析及計算

機械論文編號:JX861  論文字數:18105.頁數:43   附CAD圖

目錄
 中文摘要 I
英文摘要 II
第一章  緒  論 1
1.1 研究動機與目的 1
1.2 研究背景 1
1.4 論文內容概述 3
第二章  連桿及軸瓦的布置 4
2.1連桿 4
2.1.1 連桿的功用及工作條件 4
2.1.2 連桿構造 4
 2.2 軸瓦 6
2.2.1 連桿軸瓦的工作條件 6
 2.2.2 連桿軸瓦的功用 6
2.2.3 連桿軸瓦的組成 6
第三章  連桿組設計 7
3.1 連桿材料 7
3.2 連桿長度的確定 7
3.3 連桿小頭結構設計 8
3.4 連桿桿身結構設計 8
 3.5 連桿大頭結構設計 9
 3.6 連桿的受力分析 10
 3.6.1 連桿的三維模型 10
 3.6.2 位移邊界條件和載荷處理 11
 3.6.3 有限元計算結果 17
 3.7 連桿疲勞強度校核 18
 3.7.1 連桿在最大壓力情況下疲勞強度校核 19
 3.7.2 連桿在最大拉力情況下疲勞強度校核 19
 3.8 連桿結構優化 20
第四章  連桿軸瓦設計 24
 4.1 軸瓦材料 24
 4.2 軸瓦的結構設計 24
 4.2.1 軸瓦表面的幾何形狀 25
 4.2.2 軸承寬度和油槽 25
 4.2.3 定位與安裝 28
 4.3 軸瓦的受力分析 29
 4.3.1 軸瓦的有限元模型 29
 4.3.2 軸承座厚度的確定 30
 4.3.3應力分布 32
第五章  總 結 34
參考文獻 36
致     謝 37

摘     要
    連桿是汽車發動機中的重要零件，它連接著活塞和曲軸，其作用是將活塞的往復運動轉變為曲軸的旋轉運動，并把作用在活塞上的力傳給曲軸以輸出功率。連桿在工作中，除承受燃燒室燃氣產生的壓力外，還要承受縱向和橫向的慣性力。連桿多為鋼件，其主體部分的截面多為圓形或工字形，兩端有孔，孔內裝有青銅襯套，供裝入軸銷而構成鉸接。
本文主要研究發動機連桿及軸瓦的組成，各零部件的結構和功用，并完成4102發動機連桿及其軸瓦主要零部件的分析與計算。我們主要以連桿小頭、連桿桿身、連桿大頭、軸瓦等零部件為例來設計并分析計算，從設計要求、結構尺寸、材料選擇、受力分析等幾方面來完成。同時，還運用AutoCAD和Ansys技術，畫出連桿總成裝配圖以及各零部件圖和應力分布圖。
關鍵詞：連桿 軸瓦 分析 計算

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