CN101260843A - 一种发动机缸盖上的燃烧室结构 - Google Patents
一种发动机缸盖上的燃烧室结构 Download PDFInfo
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- CN101260843A CN101260843A CNA200810069540XA CN200810069540A CN101260843A CN 101260843 A CN101260843 A CN 101260843A CN A200810069540X A CNA200810069540X A CN A200810069540XA CN 200810069540 A CN200810069540 A CN 200810069540A CN 101260843 A CN101260843 A CN 101260843A
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- 238000001816 cooling Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
一种发动机缸盖上的燃烧室结构，燃烧室在缸盖上呈凹坑形，燃烧室的壁上设有进、排气门座圈安装孔和火花塞安装孔，燃烧室壁的外周缘与缸盖端面之间为圆弧R过渡或圆滑过渡。采用本发明技术方案的发动机与传统的同类型发动机相比，避免了燃烧室壁外周缘处的超高温现象，发动机尾气排放中的Nox含量可降低10％～20％。
Description
技术领域
本发明属于发动机技术领域，具体地说，涉及发动机缸盖上燃烧室结构的改进设计。
背景技术
发动机工作时，活塞在气缸内作往复运动，当活塞位于上止点位置时，活塞顶部与气缸盖内表面所形成的空间称为燃烧室。直喷式燃烧室(也称统一式燃烧室)大都以凹坑形式出现在活塞或缸盖上。
目前发动机缸盖上凹坑形式的燃烧室有浴盆型、楔型、半球型等，其中以半球型居多。混合气进入燃烧室后经压缩、燃烧做功后排出，由于高温、高压的作用，空气中的氧和氮在燃烧室中会生成NO和少量的NO2随尾气一起排出，NO在进入大气后又氧化成NO2，故统称为NOx，发动机尾气中的NOx可经呼吸进入人体肺部，与肺中的水汽结合生成稀硝酸，损害人体健康；此外，HC加上NOx在阳光照射下，会形成光化学烟雾，可刺激人的眼睛，引起肺炎、肺气肿及致癌效应，因此发动机尾气中的NOx是非常有害的气体，是作为发动机排放指标须严加控制的。
从发动机排放污染物的生成机理来看，NOx的生成主要是由于燃烧室内的高温和富氧引起的。因此，为降低尾气排放中的NOx含量，应着力解决燃烧室内终燃混合气的冷却问题。从现有发动机缸盖上燃烧室的结构来看，燃烧室壁面外周缘与缸盖端面之间均为尖角过渡，通过热流分析发现，燃烧室导热时容易在周圈形成死角，使得该处的传热、导热效果不佳，燃烧室周圈温度过高，表面炙热，从而导致了发动机尾气排放中NOx的含量偏高。
发明内容
本发明要解决的问题是提供一种能明显降低发动机尾气排放中NOx含量的发动机缸盖上的燃烧室结构。
为解决上述技术问题，本发明提供的发动机缸盖上的燃烧室结构，其燃烧室在缸盖上呈凹坑形，燃烧室的壁上设有进、排气门座圈安装孔和火花塞安装孔，燃烧室壁的外周缘与缸盖端面之间为圆弧R过渡或圆滑过渡。
燃烧室壁外周缘与缸盖端面之间采用圆弧R过渡或圆滑过渡结构后，通过热流分析发现，导热时不会在燃烧室壁外周缘处形成死角，热传导顺畅。当混合气燃烧做功终了时燃烧室壁的热量易于向外导出，不会在缸盖燃烧室壁外周缘处出现温度超高的现象，从而使发动机尾气中的NOx排放量大大减少。通过样件制作装机及试验对比验证，采用这种结构燃烧室的发动机比同类型发动机可降低NOx排放物高达10％～20％。
附图说明
图1是本发明的结构示意图。
图2是图1的A-A剖视图。
图3是图2的局部放大图。
图4是图1的B-B剖视图。
图5是图4的C向视图。
具体实施方式
下面结合附图和实施例对本发明作进一步说明：
如图1至图5所示，本发明所述发动机缸盖上的燃烧室结构是：燃烧室1在缸盖2上呈凹坑形，燃烧室1的壁上设有进、排气门座圈安装孔3、4和火花塞安装孔5，燃烧室1壁的外周缘与缸盖2端面之间D为圆弧R过渡或圆滑过渡。
采用上述结构后，消除了燃烧室1壁外周缘与缸盖2端面之间的尖角，使其导热时不会在燃烧室1壁外周缘处形成死角，使热传导顺畅。当混合气燃烧做功终了时燃烧室1壁的热量易于向外导出，不会在燃烧室1壁外周缘处出现温度超高的现象，从而使发动机尾气中的NOx排放量大大减少。在CG125发动机上，通过样件制作装机及试验对比验证，采用这种结构燃烧室的CG125发动机比普通CG125发动机可降低NOx排放物高达10％～20％。
燃烧室1壁的外周缘与缸盖2端面之间最好为单曲率圆弧R过渡，这样便于加工。
本发明将燃烧室壁的外周缘与缸盖端面之间采用圆弧R过渡或圆滑过渡结构后，制造时燃烧室壁直接通过铸造成形，机加时只需加工缸盖端面，圆弧R过渡或圆滑过渡处自然形成挤气面，不需再对燃烧室壁外周缘部位进行加工，简化了制造工艺，提高了生产效率。
Claims (2)
1、一种发动机缸盖上的燃烧室结构，燃烧室(1)在缸盖(2)上呈凹坑形，燃烧室(1)的壁上设有进、排气门座圈安装孔(3、4)和火花塞安装孔(5)，其特征在于：所述燃烧室(1)壁的外周缘与缸盖(2)端面之间(D)为圆弧R过渡或圆滑过渡。
2、根据权利要求1所述的一种发动机缸盖上的燃烧室结构，其特征在于：所述燃烧室(1)壁的外周缘与缸盖(2)端面之间(D)为单曲率圆弧R过渡。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810069540XA CN101260843A (zh) | 2008-04-03 | 2008-04-03 | 一种发动机缸盖上的燃烧室结构 |
| PCT/CN2008/072384 WO2009121231A1 (zh) | 2008-04-03 | 2008-09-17 | 发动机缸盖上的燃烧室结构 |
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| CNA200810069540XA CN101260843A (zh) | 2008-04-03 | 2008-04-03 | 一种发动机缸盖上的燃烧室结构 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009121231A1 (zh) * | 2008-04-03 | 2009-10-08 | 隆鑫工业有限公司 | 发动机缸盖上的燃烧室结构 |
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| US5398645A (en) * | 1993-06-15 | 1995-03-21 | Outboard Marine Corporation | Combustion chamber for internal combustion engine |
| WO1997035102A1 (en) * | 1996-03-19 | 1997-09-25 | Outboard Marine Corporation | Two-stroke engine piston bowl configurations |
| US5970945A (en) * | 1998-02-11 | 1999-10-26 | Outboard Marine Corporation | Barrier divided combustion chamber for fuel injection two-stroke engine |
| CN1661212B (zh) * | 2003-08-21 | 2011-08-17 | 周亮俊 | 高效内燃机及其燃烧方法 |
| CN101260843A (zh) * | 2008-04-03 | 2008-09-10 | 隆鑫工业有限公司 | 一种发动机缸盖上的燃烧室结构 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009121231A1 (zh) * | 2008-04-03 | 2009-10-08 | 隆鑫工业有限公司 | 发动机缸盖上的燃烧室结构 |
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