WO2009121231A1 - 发动机缸盖上的燃烧室结构 - Google Patents

发动机缸盖上的燃烧室结构 Download PDF

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Publication number
WO2009121231A1
WO2009121231A1 PCT/CN2008/072384 CN2008072384W WO2009121231A1 WO 2009121231 A1 WO2009121231 A1 WO 2009121231A1 CN 2008072384 W CN2008072384 W CN 2008072384W WO 2009121231 A1 WO2009121231 A1 WO 2009121231A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion chamber
wall
engine
cylinder cover
transition
Prior art date
Application number
PCT/CN2008/072384
Other languages
English (en)
French (fr)
Inventor
秦元伟
顾品胜
Original Assignee
隆鑫工业有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 隆鑫工业有限公司 filed Critical 隆鑫工业有限公司
Publication of WO2009121231A1 publication Critical patent/WO2009121231A1/zh

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Classifications

    • 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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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

Definitions

  • BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to the field of engine technology and, in particular, to an improved design of a combustion chamber structure on an engine cylinder head.
  • BACKGROUND OF THE INVENTION When an engine is in operation, a piston reciprocates within a cylinder. When the piston is at a top dead center position, a space formed by the top of the piston and the inner surface of the cylinder head is referred to as a combustion chamber.
  • Direct-injection combustion chambers also known as unified combustion chambers are mostly found in the form of pits on pistons or rainbow covers.
  • the combustion chamber in the form of a pit on the engine cylinder head has a bathtub type, a wedge type, a hemisphere type, etc., and most of them are hemispherical types.
  • the mixed gas After the mixed gas enters the combustion chamber and is compressed and burned, it is discharged. Due to the high temperature and high pressure, oxygen and nitrogen in the air will generate NO in the combustion chamber and a small amount of N0 2 will be discharged together with the exhaust gas, and NO will enter the atmosphere.
  • NO x in the engine exhaust gas can enter the body through lung respiration, combined with water vapor in the lungs dilute nitric acid production, damage to human health; Further, HC NO x plus the sun under illumination, photochemical smog formation, can irritate the eyes, causing pneumonia, emphysema and carcinogenic effects, and therefore NO x in the engine exhaust gas is very harmful, as the engine is required to strictly control the emission targets.
  • Mechanism pollutant emissions from an engine point of view, generation of NO x is mainly due to high temperature and oxygen-rich combustion chamber caused.
  • the present invention provides a combustion chamber structure on an engine rainbow cover, wherein the combustion chamber has a concave shape on the cylinder head, and the inlet, the exhaust valve seat mounting hole and the spark plug are installed on the wall of the combustion chamber.
  • the hole, the outer peripheral edge of the combustion chamber wall and the end face of the cylinder head are a circular arc R transition or a smooth transition.
  • FIG. 1 is a schematic view of the structure of the present invention.
  • Fig. 2 is a cross-sectional view taken along line AA of Fig. 1;
  • Fig. 3 is a partial enlarged view of Fig. 2;
  • Fig. 1 is a schematic view of the structure of the present invention.
  • the combustion chamber structure on the engine rainbow cover of the present invention is:
  • the combustion chamber 1 has a concave shape on the cylinder head 2, and the inlet and exhaust valves are arranged on the wall of the combustion chamber 1.
  • the seat mounting holes 3, 4 and the spark plug mounting hole 5, the portion D between the outer periphery of the wall of the combustion chamber 1 and the end surface of the rainbow cover 2 is a circular arc R transition or a smooth transition.
  • the outer peripheral edge of the wall of the combustion chamber 1 and the end surface of the rainbow cover 2 have a single curvature arc R transition, which is convenient for labor.
  • the invention adopts a circular arc R transition or a smooth transition structure between the outer peripheral edge of the combustion chamber wall and the end surface of the cylinder head, and the combustion chamber wall is directly formed by casting during manufacture, and only the end face of the rainbow cover is processed during machining, and the arc R transition Or the squeezing surface is naturally formed at the smooth transition, and the peripheral portion of the combustion chamber wall is not required to be processed, which simplifies the manufacturing process and improves the production efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

发动机缸盖上的燃烧室结构
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虹盖上。 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 ^故功后排出， 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 N02随尾气一起排出， NO 在进入大气后又氧化成 N02 , 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。 从现有发动机虹盖上燃 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 ^^^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虹盖上的燃烧室结构， 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 丈功终了时燃烧室壁的热量易于向外导出， 不会在 虹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 t量大大减少。 通过样件制作装机及试-睑对比-睑证， 采用这种 结构燃烧室的发动机与同类型发动机相比可降低 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， 本发明所述的发动机虹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壁的外周缘与虹盖 2端面之间的部分 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壁外周缘与虹盖 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 ^故功终了时燃烧室 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 CG 125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发动机与普通 CG125发动机相比可降低 NOx排放物高达 10% ~ 20%。 燃烧室 1壁的外周缘与虹盖 2端面之间最好为单曲率圆弧 R过渡， 这 样便于力口工。 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，机加工时只需加工虹盖端面， 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

权 利 要 求 书
1. 一种发动机虹盖上的燃烧室结构， 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) 端面之间的部分（ D ) 为圆弧 R过渡或圆滑过渡。
2. 根据权利要求 1 所述的发动机虹盖上的燃烧室结构， 其特征在于： 所 述燃烧室 （ 1 ) 壁的外周缘与缸盖 （2) 端面之间的部分 （D) 为单曲 率圆弧 R过渡。
PCT/CN2008/072384 2008-04-03 2008-09-17 发动机缸盖上的燃烧室结构 WO2009121231A1 (zh)

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CN200810069540.X 2008-04-03
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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398645A (en) * 1993-06-15 1995-03-21 Outboard Marine Corporation Combustion chamber for internal combustion engine
CN1193374A (zh) * 1996-03-19 1998-09-16 舷外发动机公司 两冲程发动机活塞的凹坑结构
CN1290324A (zh) * 1998-02-11 2001-04-04 舷外发动机公司 分隔燃料喷射二冲程发动燃烧室的凸塞
CN1661212A (zh) * 2003-08-21 2005-08-31 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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398645A (en) * 1993-06-15 1995-03-21 Outboard Marine Corporation Combustion chamber for internal combustion engine
CN1193374A (zh) * 1996-03-19 1998-09-16 舷外发动机公司 两冲程发动机活塞的凹坑结构
CN1290324A (zh) * 1998-02-11 2001-04-04 舷外发动机公司 分隔燃料喷射二冲程发动燃烧室的凸塞
CN1661212A (zh) * 2003-08-21 2005-08-31 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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