JPH0367015A - Combustion chamber structure of internal combustion engine - Google Patents
Combustion chamber structure of internal combustion engineInfo
- Publication number
- JPH0367015A JPH0367015A JP20251889A JP20251889A JPH0367015A JP H0367015 A JPH0367015 A JP H0367015A JP 20251889 A JP20251889 A JP 20251889A JP 20251889 A JP20251889 A JP 20251889A JP H0367015 A JPH0367015 A JP H0367015A
- Authority
- JP
- Japan
- Prior art keywords
- protrusion
- ignition plug
- combustion chamber
- fuel
- valve side
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 37
- 239000000446 fuel Substances 0.000 abstract description 27
- 239000007788 liquid Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000000391 smoking effect Effects 0.000 abstract 2
- 230000003628 erosive effect Effects 0.000 abstract 1
- 230000013011 mating Effects 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は内燃機関の燃焼室構造の改良に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to an improvement in the structure of a combustion chamber of an internal combustion engine.
〈従来の技術）
一つの燃焼室に４つの弁、即ち吸気弁と排気弁を２個づ
つもつ４弁式の内燃機関では、燃焼室のｔｉ造として一
般的にはベントルーフ型を採用することが多い。ベント
ルーフ型燃焼室では、屋根型に対向するフラットな各斜
面にそれぞれ吸気弁とＵＦ気弁とを配置し、稜線の中央
付近に点火栓を取付けるようになっている。(Prior art) In a four-valve internal combustion engine that has four valves in one combustion chamber, that is, two intake valves and two exhaust valves, a vent roof type is generally used as the combustion chamber structure. There are many. In a vent roof type combustion chamber, an intake valve and a UF air valve are arranged on each flat slope facing the roof type, and an ignition plug is installed near the center of the ridgeline.
ところで内燃機関の運転条件によっては、吸気弁を通し
て燃焼室に吸入される混合気中の燃料が十分に微粒化さ
れずに液状のまま壁面を伝わって流入してくることがあ
る。この燃料の壁流成分がフラットな斜面を伝わって点
火栓に直接的に衝突、付着すると、点火栓の着火特性が
不安定となる、いわゆるくすぶり現象を起こすことがあ
った。However, depending on the operating conditions of the internal combustion engine, fuel in the air-fuel mixture taken into the combustion chamber through the intake valve may not be sufficiently atomized and may flow along the wall surface in a liquid state. When this wall flow component of the fuel travels along a flat slope and directly collides with and adheres to the spark plug, the ignition characteristics of the spark plug become unstable, resulting in a so-called smoldering phenomenon.
過給機を装備した内燃機関のように燃焼室容積に対して
供給燃料の絶対量が多くなる場きには、とくにこの傾向
が顕著になる。This tendency is particularly noticeable when the absolute amount of fuel supplied is large relative to the volume of the combustion chamber, such as in an internal combustion engine equipped with a supercharger.
（発明が解決しようとする課題〉
このような点火栓のくすぶり対策として、実開昭５８−
１９３０１４号公報にもあるように、点火栓の周囲に帯
状の突起を設け、燃焼室壁面に沿って流れる液状燃料が
点火栓に流れ込むのを阻止する提案があるが、この場合
、点火栓の全周を取り囲む突起が吸入空気の燃焼室への
流入抵抗となり、とくに機関高回転域での吸気充填効率
を低下させるという問題があった。(Problem to be solved by the invention) As a countermeasure against smoldering of such spark plugs,
As stated in Publication No. 193014, there is a proposal to provide a band-shaped protrusion around the ignition plug to prevent the liquid fuel flowing along the wall surface of the combustion chamber from flowing into the ignition plug, but in this case, the entire ignition plug is There was a problem in that the surrounding protrusions created resistance to the intake air flowing into the combustion chamber, reducing intake air filling efficiency, especially in high engine speed ranges.
本発明は、このように吸気充填効率を低下させることな
く点火栓のくすぶりを効果的に抑制することを目的とす
る。An object of the present invention is to effectively suppress smoldering of the spark plug without reducing the intake air filling efficiency.
（課題を解決するための手段）
そこで本発明は、燃焼室に吸気弁と排気弁を配置し、か
つこれら間に点火栓を配置した内燃機関において、点火
栓の周囲に燃焼室壁面から突出した突起を設け、かつこ
の突起の高さを排気弁側よりも吸気弁側で高くなるよう
に設定した。(Means for Solving the Problems) Therefore, the present invention provides an internal combustion engine in which an intake valve and an exhaust valve are disposed in a combustion chamber, and a spark plug is disposed between these valves. A protrusion was provided, and the height of the protrusion was set to be higher on the intake valve side than on the exhaust valve side.
（作用）
吸気弁から燃焼室に流入した燃料の壁流成分は、吸入空
気の流れに押されて一部が点火栓の方向に向かうが、突
起により点火栓への流れが妨げられ、点火栓を直撃して
付着する壁流成分は大幅に減少する。(Function) The wall flow component of the fuel that has flowed into the combustion chamber from the intake valve is pushed by the flow of intake air and a portion of it heads toward the ignition plug, but the protrusion prevents the flow toward the ignition plug, and the ignition plug The wall flow component that directly hits and adheres to the wall flow is significantly reduced.
点火栓周囲の突起は全周にわたって等しく突出するので
はなく、吸気弁側から排気弁側に向けて低くなっていく
ため、吸入空気流に対する抵抗はそれほど大きくならず
、吸気充填効率の低下をもたらさない。The protrusions around the spark plug do not protrude equally over the entire circumference, but become lower from the intake valve side to the exhaust valve side, so the resistance to the intake air flow is not as large, resulting in a decrease in intake air filling efficiency. do not have.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図〜第３図に示す第１の実施例において、１はシリ
ンダヘッド、２はシリンダブロック、３はピストンで、
これらによってペントルーフ型の燃焼室４が区画形成さ
れる。In the first embodiment shown in FIGS. 1 to 3, 1 is a cylinder head, 2 is a cylinder block, 3 is a piston,
A pent roof type combustion chamber 4 is defined by these sections.
燃焼室４の屋根型の各斜面５．５には各２個づつの吸気
弁６，６と排気弁７．７が配置され、また、両斜面５と
５が連なる稜線の中央部には、吸気弁６と排気弁７との
間にはさまれるようにして点火栓８が配置される。Two intake valves 6, 6 and two exhaust valves 7.7 are arranged on each roof-shaped slope 5.5 of the combustion chamber 4, and in the center of the ridge line where both slopes 5 and 5 are connected, An ignition plug 8 is placed between the intake valve 6 and the exhaust valve 7.
そして点火栓８の周囲には燃焼室壁面から突出して帯状
の突起１０ａが形成され、この突起１０ａは点火栓８の
ねじ部端面８ａよりも突出することはないが、燃焼室壁
面からの突出量が吸気弁側（Ｈ）が排気弁側（Ｈ２）よ
りも大きく（高く）、かつその間を連続的な斜面で結ぶ
ように形成されている。A band-shaped protrusion 10a is formed around the ignition plug 8, protruding from the combustion chamber wall surface, and although this protrusion 10a does not protrude beyond the threaded end surface 8a of the ignition plug 8, the amount of protrusion from the combustion chamber wall surface is is larger (higher) on the intake valve side (H) than on the exhaust valve side (H2), and is connected by a continuous slope.
なお、突起１０ａの高さの差は、好ましい一例としては
、ＨＩ ８２＝１．５問となることである。Note that, as a preferable example, the difference in height of the protrusions 10a is HI 82 = 1.5 questions.
以上のように構成され、次に作用について説明する。The system is constructed as described above, and its operation will be explained next.
吸入行程で吸気弁６が開くと、燃焼室４に流入する吸入
空気の多くは、点火栓８や対向する排気弁７の下面を通
過してから、下降するピストン３の方向に縦渦を描くよ
うにして流れる。When the intake valve 6 opens during the intake stroke, most of the intake air flowing into the combustion chamber 4 passes through the ignition plug 8 and the lower surface of the opposing exhaust valve 7, and then forms a vertical vortex in the direction of the descending piston 3. It flows like this.
燃料供給量の多い運転領域では、混合気と共に燃焼室４
に流入した液状燃料が吸入空気流に押されつつ、燃焼室
壁面を伝わって一部は点火栓８の付近にも向かう０点火
栓８の周囲には排気弁側から吸気弁側に向けて高くなる
突起１０ａが形成されているため、突起１０ａを乗り越
えて燃料壁流が点火栓８に流れ込むのを妨げられる。一
部の壁流はこの突起１０ａの周囲を流れて排気弁側へと
向かう。In the operating range where the amount of fuel supplied is large, the combustion chamber 4 is
The liquid fuel that has flowed into the ignition plug 8 is pushed by the intake air flow and travels along the wall surface of the combustion chamber, and some of it also goes to the vicinity of the ignition plug 8.Around the ignition plug 8, there is a high rise from the exhaust valve side toward the intake valve side. Since the protrusion 10a is formed, the fuel wall flow is prevented from flowing over the protrusion 10a into the spark plug 8. A part of the wall flow flows around this protrusion 10a and heads toward the exhaust valve side.
このようにして点火栓８に燃料が付着したり、燃料に浸
されるのが防止され、したがって点火栓８の着火特性が
不安定になる、いわゆるくすぶり現象を阻止でき、運転
性や燃費あるいは排気組成の悪化が回避される。In this way, it is possible to prevent fuel from adhering to the spark plug 8 or from soaking it in fuel, thereby preventing the so-called smoldering phenomenon that makes the ignition characteristics of the spark plug 8 unstable, thereby improving drivability, fuel efficiency, and exhaust emissions. Compositional deterioration is avoided.
ところでこの突起１０ａは吸気弁側から排気弁側に向か
うにしたがって低くなるため、吸入空気流に対する空気
抵抗が小さく、渦等の発生も最小限に抑え、これらによ
りとくに機関高回転時でも吸気充填効率が低下するのを
防ぐことができ、機関最大出力の向上も図れるのである
。By the way, this protrusion 10a becomes lower as it goes from the intake valve side to the exhaust valve side, so the air resistance against the intake air flow is small and the generation of vortices etc. is minimized, thereby improving the intake air filling efficiency especially at high engine speeds. It is possible to prevent the engine from decreasing, and it is also possible to improve the engine's maximum output.
次に第４図の実施例を説明すると、これは頂部がフラッ
トな斜面５と平行になるように突起１０ｂを形成したも
のである。ただし、突起１０ｂの高さが吸気弁側で高く
なることには変わりはない。Next, the embodiment shown in FIG. 4 will be described. In this embodiment, the protrusion 10b is formed so that the top thereof is parallel to the flat slope 5. However, the height of the protrusion 10b remains higher on the intake valve side.
また、第５図の実施例は、突起１０ｃの形状を平面的に
みて、吸気弁６から排気弁７の方向に縦長の楕円形とな
るように形成したもので、このようにすることにより突
起１０ｃに衝突した壁流は左右に分流しやすくなり、か
つ突起１０ｃを乗り越えて点火栓８まで到達するのも難
しくなる。Further, in the embodiment shown in FIG. 5, the shape of the protrusion 10c is formed to be an elongated ellipse in the direction from the intake valve 6 to the exhaust valve 7 when viewed in plan. The wall flow that collides with 10c is likely to separate left and right, and it is also difficult to get over the protrusion 10c and reach the ignition plug 8.
第６図の実施例は、円形の突起１０ｄの吸気弁側の２側
面１１を機械的加工により鋭角に形成したもので、この
部分に到達したを流は鋭角部により剥離し、吹き飛ばさ
れるため、点火栓８への到速量は非常に少なくなる。In the embodiment shown in FIG. 6, the two side surfaces 11 on the intake valve side of the circular protrusion 10d are formed into acute angles by mechanical processing. The amount reaching the spark plug 8 becomes very small.
第７図、第８図の実施例は、突起１０ｅを吸気弁側にの
み形成し、吸気弁側からみて点火栓８の裏側になる部分
は突出させないようにしたもので、吸気弁側に突出して
いる突起１０ｅにより燃料の壁流が点火栓８を直撃する
のを防止でき、同時に突起１０ｅの吸入空気流に対する
抵抗値を可及的に低減させられる。In the embodiments shown in FIGS. 7 and 8, the protrusion 10e is formed only on the intake valve side, and the part that becomes the back side of the spark plug 8 when viewed from the intake valve side is not protruded; The protrusion 10e can prevent the wall flow of fuel from directly hitting the spark plug 8, and at the same time, the resistance value of the protrusion 10e to the intake air flow can be reduced as much as possible.
第９図に示す実施例は、点火栓８の中心線を吸気弁側に
傾けてねじ部端面が突起１０ａと平行になるようにした
もので、点火栓８を傾けた分だけ燃料の直撃量が減少し
、くすぶり防止効果を高められる。In the embodiment shown in FIG. 9, the center line of the ignition plug 8 is tilted toward the intake valve side so that the end face of the threaded portion is parallel to the protrusion 10a, and the amount of direct impact of the fuel is equal to the amount by which the ignition plug 8 is tilted. , and the smoldering prevention effect can be enhanced.
第１０図の実施例は、突起１０ｆの突出高さを点火栓８
のねじ部端面８ａよりも高くしたもので、突起１０ｆを
乗り越えようとする壁流成分は、吸入空気流に押されて
突起１０ｆの鋭利な内周端でほとんど剥離、飛散するた
めに、点火栓８への到達量はきわめて少なくなる。なお
、突起１０ｆの内周面は点火栓取付穴の加工時に一体的
にドリル加工される。In the embodiment shown in FIG. 10, the protrusion height of the protrusion 10f is set to 8
The wall flow component that tries to get over the protrusion 10f is pushed by the intake air flow and is mostly separated and scattered at the sharp inner peripheral end of the protrusion 10f. The amount that reaches 8 is extremely small. Note that the inner circumferential surface of the protrusion 10f is integrally drilled when forming the spark plug mounting hole.
第１１図の実施例は、点火栓８の周囲の突起１０ｇを、
中心の点火栓８に向けて頂面の内周側が高くなるように
傾斜させたもので、鋭角な内周端が前記のように燃料の
剥離、飛散作用を生じると共に、傾斜した頂面に沿う吸
入空気流により剥離した燃料は点火栓８から離れるよう
に吹き飛ばされるので、点火栓８のくすぶりはより一層
効果的に阻止される。In the embodiment shown in FIG. 11, the protrusion 10g around the spark plug 8 is
The inner circumferential side of the top surface is inclined so that it becomes higher toward the center spark plug 8, and the sharp inner circumferential edge causes the fuel to peel off and scatter as described above, and it also follows the inclined top surface. Since the separated fuel is blown away from the spark plug 8 by the intake air flow, the spark plug 8 is prevented from smoldering more effectively.
第１２図の実施例は、突起１０ｈの頂面の傾きについて
、吸気弁側の傾斜を排気弁側の傾斜よりも大きく（強く
）することにより、突起１０ｈの容積を大きくすること
なく、したがって吸入空気流に対する抵抗を増大させる
ことなく、飛散燃料を点火栓８から遠ざけられるように
したものである。In the embodiment shown in FIG. 12, the inclination of the top surface of the protrusion 10h is made larger (stronger) on the intake valve side than on the exhaust valve side, thereby eliminating the need to increase the volume of the protrusion 10h. This allows the scattered fuel to be moved away from the ignition plug 8 without increasing resistance to airflow.
そして第１３図の実施例は、点火栓８を吸気弁側に傾け
ることにより、突起１０ｉの吸気弁側内周のなす角度を
より鋭角にして、燃料の剥離、飛散効果を高めるように
したのものである。In the embodiment shown in FIG. 13, by tilting the spark plug 8 toward the intake valve side, the angle formed by the inner periphery of the protrusion 10i on the intake valve side is made more acute, thereby increasing the effect of separating and scattering the fuel. It is something.
なお、各突起の内周面は点火栓取付穴のトリ・ル加工時
に一緒に加工されるもので、内周端面は鋭利な形状に形
成される。この角度が鋭利になればなるほど付着燃料の
剥離、飛散効果が高く、点火栓８への付着を効果的に阻
止できるのである。Note that the inner circumferential surface of each protrusion is machined together when trilling the spark plug mounting hole, and the inner circumferential end surface is formed into a sharp shape. The sharper this angle is, the greater the effect of peeling off and scattering the adhering fuel, and the more effectively it is possible to prevent adhesion to the ignition plug 8.
（発明の効果）
以上のように本発明によれば、点火栓の周囲に形成する
突起を、吸気弁側で高く排気弁側で低くなるように設定
したので、燃焼室の内壁面を伝わって点火栓に到達、付
着する液状燃料を減少させることができ、点火栓のくす
ぶり現象を防止して運転性や燃費、あるいは排気組成の
改善が図れ、また、不必要な突起を削除することにより
吸入空気流に対する抵抗を減じ、吸気充填効率の低下を
抑制して機関出力や過渡応答性を向上させられる。(Effects of the Invention) As described above, according to the present invention, the protrusion formed around the ignition plug is set to be higher on the intake valve side and lower on the exhaust valve side, so that the protrusion is formed on the inner wall surface of the combustion chamber. It is possible to reduce the amount of liquid fuel that reaches and adheres to the spark plug, preventing the spark plug from smoldering and improving driveability, fuel efficiency, and exhaust composition.In addition, by removing unnecessary protrusions, the intake It reduces resistance to airflow, suppresses declines in intake air filling efficiency, and improves engine output and transient response.
第１図は本発明の第１の実施例の縦断面図、第２図は第
１図の燃焼室平面図、第３図は第２図のＡ−Ａ線断面図
、第４図は第２の実施例の断面図、第５図は第３の実施
例の燃焼室平面図、第６図は第４の実施例の同じく一部
拡大平面図、第７図は第５の実施例の同じく一部拡大平
面図、第８図は第７図のＢ−Ｂｌｌ断面図、第９図は第
６の実施例の断面図、第１０図は第７の実施例の断面図
、第１１図は第８の実施例の断面図、第１２図は第９の
実施例の断面図、第１３図は第１０の実施例の断面図で
ある。
４・・・燃焼室、５・・・斜面、６・・・吸気弁、７・
・・排気弁、８・・・点火栓、ｌ Ｏａ、１０ｂ、１０
ｃ、１０ｄ、１０ｅ、１０ｆ、１０ｇ、１０ｈ、１０ｉ
−突起。
第
１
図
第
図
第２図
第３
図
第
図
第
図
第
図FIG. 1 is a longitudinal sectional view of the first embodiment of the present invention, FIG. 2 is a plan view of the combustion chamber in FIG. 1, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG. 5 is a sectional view of the second embodiment, FIG. 5 is a plan view of the combustion chamber of the third embodiment, FIG. 6 is a partially enlarged plan view of the fourth embodiment, and FIG. 7 is a partially enlarged plan view of the fifth embodiment. Similarly, a partially enlarged plan view, FIG. 8 is a B-Bll sectional view of FIG. 7, FIG. 9 is a sectional view of the sixth embodiment, FIG. 10 is a sectional view of the seventh embodiment, and FIG. 12 is a sectional view of the ninth embodiment, and FIG. 13 is a sectional view of the tenth embodiment. 4... Combustion chamber, 5... Slope, 6... Intake valve, 7...
... Exhaust valve, 8... Spark plug, l Oa, 10b, 10
c, 10d, 10e, 10f, 10g, 10h, 10i
- Protrusion. Figure 1 Figure 2 Figure 3 Figure Figure Figure Figure
Claims (1)
栓を配置した内燃機関において、点火栓の周囲に燃焼室
壁面から突出した突起を設け、かつこの突起の高さを排
気弁側よりも吸気弁側で高くなるように設定したことを
特徴とする内燃機関の燃焼室構造。In an internal combustion engine in which an intake valve and an exhaust valve are placed in a combustion chamber, and a spark plug is placed between them, a protrusion protruding from the combustion chamber wall is provided around the spark plug, and the height of this protrusion is set to the exhaust valve side. A combustion chamber structure for an internal combustion engine characterized by being set higher on the intake valve side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1202518A JP2629969B2 (en) | 1989-08-04 | 1989-08-04 | Combustion chamber structure of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1202518A JP2629969B2 (en) | 1989-08-04 | 1989-08-04 | Combustion chamber structure of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0367015A true JPH0367015A (en) | 1991-03-22 |
| JP2629969B2 JP2629969B2 (en) | 1997-07-16 |
Family
ID=16458819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1202518A Expired - Fee Related JP2629969B2 (en) | 1989-08-04 | 1989-08-04 | Combustion chamber structure of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2629969B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015124662A (en) * | 2013-12-26 | 2015-07-06 | トヨタ自動車株式会社 | Combustion chamber structure of spark ignition type internal combustion engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58193014U (en) * | 1982-06-21 | 1983-12-22 | トヨタ自動車株式会社 | Engine combustion chamber structure |
| JPS6463617A (en) * | 1987-09-02 | 1989-03-09 | Toyota Motor Corp | Direct injection type two-cycle internal combustion engine |
-
1989
- 1989-08-04 JP JP1202518A patent/JP2629969B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58193014U (en) * | 1982-06-21 | 1983-12-22 | トヨタ自動車株式会社 | Engine combustion chamber structure |
| JPS6463617A (en) * | 1987-09-02 | 1989-03-09 | Toyota Motor Corp | Direct injection type two-cycle internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015124662A (en) * | 2013-12-26 | 2015-07-06 | トヨタ自動車株式会社 | Combustion chamber structure of spark ignition type internal combustion engine |
| US20160326947A1 (en) * | 2013-12-26 | 2016-11-10 | Toyota Jidosha Kabushiki Kaisha | Combustion chamber structure of spark-ignition internal combustion engine |
| US10267213B2 (en) | 2013-12-26 | 2019-04-23 | Toyota Jidosha Kabushiki Kaisha | Combustion chamber structure of spark-ignition internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2629969B2 (en) | 1997-07-16 |
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