FSAE大学生方程式赛车发动机缸盖及配气机构设计_毕业设计.doc

FSAE大学生方程式赛车发动机缸盖及配气机构设计
摘要
以FSAE大学生方程式赛车中最常用的HONDA CBR600-F4i发动机为例,探讨了该型号发动机中缸盖及配气机构的结构,并计算缸盖总体尺寸,凸轮型线方程式,并校核气门弹簧力。气缸盖是提高整机性能的重要结构件之一,是发动机技术竞争的焦点。气缸盖的气门排列方式与气道结构形式影响进气充量和气流在气缸内的运动,从而影响了燃烧效率,对整机的动力性、经济性以及排放都有直接的影响;配气机构的形式影响充气系数和整机噪声等;缸盖燃烧室决定了影响整机动力性能的压缩比ε,影响HC排放的F/V和对挤流起决定性作用的挤气面积以及挤气间隙,所以燃烧室对整机动力性、经济性、排放等都有重要的影响;气缸盖是整机热负荷与热应力最大的部件之一,热负荷过高将不利于发动机寿命以及可靠性的提高。在实际中要特别防止发动机的局部过热,因而对缸盖必须要有充分的冷却。
关键词 FSAE;发动机;缸盖;气门
Abstract
In this paper, Formula in FSAE college students the monly used HONDA CBR600 - F4i engine as an example, discusses the model of Cylinder head and gas distribution agencies, and calculate overall size of cylinder head, equation of CAM contour line, and check valve spring force. Cylinder head is one of the core parts that affect the performance of the engine. It is the the focus of petition. The disposal of the valves and intake manifold structure not only affect fresh air charge but airflow in the cylinder, which immediately bustion efficiency and the performance of dynamic, economic and emission. The structure of the air distributing institution has influence on charging efficiency and the noise of engine. bustion chamber pression scale which has great influence on dynamical performance; F/V which affects the exhaust of HC; Squash area and clearance which have great influence on the intensity of squash. So, combustion chamber has great influence on dynamical performance, economical performance, emission and so on. Cylinder head is one of the highest temperature parts. Higher heat stress will lower the engine’s useful life and security. In practical, it is important to avoid local overheating. To full cool to cylinder head is necessary.
Key words: FSAE; Engine; Cylinder head; The valve
目录
摘要 1
Abstract 1
1 绪论 1
FSAE大学生方程式大赛 3
赛事起源 3
赛事简介 3
FSAE大赛的意义 4
论文的研究背景及意义 4
论文研究的主要内容 5
2 发动机 5
发动机的发展历程 5
我国发动机发展现状 6
提高发动机动力性的途径 8
涡轮增压技术 8
燃油直喷技术 8
分层燃烧技术 10
连续可变气门正时机构 10
3 气缸