发动机紧耦式排气歧管结构设计
关键词 排气歧管 结构设计 材料 加工工艺 有限元分析
Title Design a tight coupling type structure engine exhaust manifold
Abstract
An exhaust manifold is a component mounted to a cylinder head of an internal
combustion engine．It is used to collect exhaust gases from each cylinder
and direct them to a common system-whereby gases arc treated to remove
harmful emissions before being released from the vehicle．In order to meet
the requirements of Euro IV emission standard，the catalytic converter is
installed at the exit of exchaust manifold usually,that means the tight
coupled manifolds are developed and used．Compared with the traditional
arrangement， this structure could make the catalystcombust rapidly and full
use of the catalyst efficiency,which is used widely in theEuro IV emission
standard vehicle．
In this paper ， I choose the material and processing technology of exhaust
manifold .Then,I design tightly coupled type the structure of the exhaust
manifold and make tightly coupled type exhaust manifold 3D model.using the
method of finite element modal analysis,I analyze the natural vibration
characteristic.
Keywords Exhaust manifold design the structure materials processing
technology finite element analysis
1 绪论 1
1．2 国内外研究现状 . 2
1.3 课题的提出及研究内容 . 5
1.3.1 课题的提出 . 5
完成汽油发动机紧耦式排气歧管的结构设计，使其满足以下条件： . 5
1.3.2 研究内容 . 5
2 排气歧管的结构设计 . 7
2.1 排气歧管应用时需考虑的因素 . 7
2.1.1 结构设计因素 . 7
2.1.2 装配因素 . 7
2.1.3 其他因素 8
2.2 排气歧管作用及设计要求 . 8
2.3 排气歧管直径的确定 . 9
2.4 排气歧管长度的确定 . 10
2.5三元催化剂设计 11
2.5.1 载体设计 11
2.5.2 衬垫设计 12
2.5.3 壳体设计 12
2.5.4 催化剂 13
2.6匹配发动机的氧传感器 13
2.7 排气歧管优化设计流程 . 13
3 排气歧管材料的选择 . 15
3．1 材料选择因素 . 15
3．2 材料选择 . 16
3.2.1 SUS 441 . 16
3.2.2 SUH409L . 17
3.2.3 SUS436L . 18
4 排气歧管加工方案 . 20
4.1 冲压成形基本原理 . 21
4.2 冲压成形技术特点 . 22
4.3 无缝焊接基本原理 . 23
4.4 无缝焊接技术特点 . 23
5 排气歧管的振动分析 . 24
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