JPS60228722A - Combustion chamber of engine - Google Patents
Combustion chamber of engineInfo
- Publication number
- JPS60228722A JPS60228722A JP59084623A JP8462384A JPS60228722A JP S60228722 A JPS60228722 A JP S60228722A JP 59084623 A JP59084623 A JP 59084623A JP 8462384 A JP8462384 A JP 8462384A JP S60228722 A JPS60228722 A JP S60228722A
- Authority
- JP
- Japan
- Prior art keywords
- spark plug
- swirl
- combustion chamber
- flow
- crossing part
- 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.)
- Pending
Links
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- 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、エンジンの燃焼室に関する。特に、本発明は
、燃焼室内にスワールが形成され、このスワールの流れ
内に点火栓が配置された燃焼室に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a combustion chamber of an engine. In particular, the present invention relates to a combustion chamber in which a swirl is formed and a spark plug is disposed within the flow of this swirl.
（従来技術）
従来、エンジンの燃焼状態を改善するために、燃焼室に
導入される吸気の流れに方向性を持たせて、燃焼室内で
吸気スワールを生じさせるようにすることは良く知られ
た技術であり、たとえば特開昭５０−１０７３０９号公
報に開示されている。(Prior art) Conventionally, it has been well known that in order to improve the combustion condition of an engine, the flow of intake air introduced into the combustion chamber is given directionality to generate an intake swirl within the combustion chamber. This technique is disclosed in, for example, Japanese Patent Laid-Open No. 107309/1983.
この公開特許公報に実施例として開示されたエンジンで
は、強いスワール流とスキッシュ流とが点火栓に直接光
らないような位置に点火栓が配置されている。これは、
点火栓にスワール流とスキッシュ流とが吹きつけられる
と、点火栓によって着火された火災がスワール流とスキ
ッシュ流とによって吹き消されるのを防止するためであ
る。In the engine disclosed as an example in this patent publication, the ignition plug is arranged at a position where the strong swirl flow and squish flow do not directly illuminate the ignition plug. this is,
This is to prevent a fire ignited by the spark plug from being blown out by the swirl flow and squish flow when the swirl flow and squish flow are blown onto the spark plug.
しかしながら、このような位置に点火栓を設けると、点
火栓の掃気が悪くなり、その着火性が悪化するという問
題がある。However, if the ignition plug is provided in such a position, there is a problem that scavenging of the ignition plug becomes poor and the ignitability of the ignition plug deteriorates.
（発明の目的）
本発明は、吸気ポートから吸入される吸気によってスワ
ールが形成されるとともにピストン頂面とシリンダヘッ
ドとによってスキッシュ流を発生させるようにしたエン
ンの燃焼室において、点火栓の掃気を向上させて、その
着火性を良好にすることを目的とする。(Object of the Invention) The present invention provides scavenging of spark plug in a combustion chamber of an engine in which a swirl is formed by intake air taken in from an intake port and a squish flow is generated by the top surface of the piston and the cylinder head. The purpose is to improve its ignitability.
（発明の構成） 上記目的を達成するため、本発明は次の構成を有する。(Structure of the invention) In order to achieve the above object, the present invention has the following configuration.
すなわち、本発明によるエンジンの燃焼室は、シリンダ
ヘッドに設けられた頂面および側面を有する凹部と、燃
焼室内に吸気スワールを生じるように形成された吸気ポ
ートと、上記凹部の頂面と側面との交差部近傍に位置す
るようにシリンダヘッドに取付けられた点火栓とを有し
、凹部の頂面と側面とは、スワール上流側から点火栓に
向って曲率半径が徐々に大きくなる曲面で接続されたこ
とを特徴とする。本発明の上記構成によれば、燃焼室内
において点火栓方向に向う吸気スワールの流れは、点火
栓の配置される凹部の頂面と側面との交差部の曲率半径
の増大により、次第に拡散するので、点火栓まわりに生
じた火炎を吹き消す恐れがなくなる。本発明においては
、シリンダヘッドに形成される凹部に隣接して比較的平
坦なスキッシュゾーンを形成することが望ましいが、こ
の場合にも、強いスキッシュ流が点火栓方向に吹きつけ
られのを防止するために、スキッシュゾーンと凹部の側
面との間の湾曲部の曲率半径は、点火栓の方向に漸次大
きくなるようにすることが好ましい。That is, the combustion chamber of the engine according to the present invention includes a recess provided in the cylinder head and having a top surface and side surfaces, an intake port formed to generate an intake swirl within the combustion chamber, and a top surface and side surfaces of the recess. The spark plug is attached to the cylinder head so as to be located near the intersection of It is characterized by having been. According to the above configuration of the present invention, the flow of intake swirl in the direction of the ignition plug in the combustion chamber is gradually diffused due to the increase in the radius of curvature of the intersection between the top surface and the side surface of the recess where the ignition plug is placed. , there is no danger of blowing out the flame generated around the ignition plug. In the present invention, it is desirable to form a relatively flat squish zone adjacent to the recess formed in the cylinder head, but in this case as well, strong squish flow is prevented from being blown toward the spark plug. Therefore, it is preferable that the radius of curvature of the curved portion between the squish zone and the side surface of the recess gradually increases in the direction of the spark plug.
（発明の効果）
本発明においては、燃焼室を構成する凹部の頂面と側面
との交差部近傍に点火栓が取付けられ、この交差部の曲
率半径は、スワール上流側から点火栓に向って徐々に大
きくなっているので、燃焼室内のスワールの流れにより
点火栓まわりに形成された火炎が吹き消され、失火する
という不具合がなくなり、かつ点火栓まわりは吸気スワ
ールにより十分に掃気され、着火性が向上する。(Effect of the invention) In the present invention, the ignition plug is installed near the intersection between the top surface and the side surface of the recess that constitutes the combustion chamber, and the radius of curvature of this intersection extends from the upstream side of the swirl toward the ignition plug. Since the size gradually increases, the flame formed around the ignition plug is extinguished by the flow of the swirl in the combustion chamber, eliminating the problem of misfires, and the area around the ignition plug is sufficiently scavenged by the intake swirl, improving ignition performance. will improve.
（実施例の説明）
第１図を参照すると、図示されたエンジンは、シリンダ
ボア１ａを有するシリンダブロック１と、該シリンダブ
ロック１の上部に取付けられたシリンダヘッド２とを有
し、シリンダボア１ａ内には、ピストン３が上下方向に
往復動自在に配置されている。シリンダヘッド２には頂
面４ａと側面４ｂとからなる凹部４が形成され、この凹
部４とピストン３の頂面とにより燃焼室５が形成される
。第２図に示すように、凹部４は、シリンダボア１ａの
全域にわたり形成されていす、シリンダボア１ａの形成
する円の片側に寄った位置にある。この凹部４が設けら
れる部分には、排気ポート６が形成され、凹部４に隣接
する平坦部には吸気ポート７が形成される。第３図に示
すように、排気ポート６には排気弁６ａが、吸気ポート
７には吸気弁７ａが組合わされる。シリンダヘッド２に
は、吸気ポート７に連続して吸気通路８が形成されてお
り、この吸気通路８および吸気ポート７は、燃焼室５内
に矢印で示すスワールを形成するような形状を有する。(Description of Embodiments) Referring to FIG. 1, the illustrated engine has a cylinder block 1 having a cylinder bore 1a, and a cylinder head 2 attached to the upper part of the cylinder block 1. The piston 3 is arranged to be able to reciprocate in the vertical direction. A recess 4 consisting of a top surface 4a and a side surface 4b is formed in the cylinder head 2, and a combustion chamber 5 is formed by this recess 4 and the top surface of the piston 3. As shown in FIG. 2, the recess 4 is formed over the entire area of the cylinder bore 1a, and is located near one side of the circle formed by the cylinder bore 1a. An exhaust port 6 is formed in the portion where the recess 4 is provided, and an intake port 7 is formed in the flat portion adjacent to the recess 4. As shown in FIG. 3, the exhaust port 6 is combined with an exhaust valve 6a, and the intake port 7 is combined with an intake valve 7a. An intake passage 8 is formed in the cylinder head 2 so as to be continuous with the intake port 7 , and the intake passage 8 and the intake port 7 have a shape that forms a swirl within the combustion chamber 5 as shown by an arrow.
第１図および第２図に示すように、スワール流とスキッ
シュ流との影響を強く受けないように凹部４の頂面４ａ
と側面４ｂとの交差部に点火栓９が配置されている。頂
面４ａと側面４ｂの交差部４ｃは、第５図および第６図
に示すように、スワールの流れ方向にみて上流側から点
火栓９の方へ向って曲率半径が徐々に大きくなっている
。第２図では、頂面４ａから交差部４ｃの曲面の始まり
の部分を線４ｄで示しである。点火栓９は、吸気スワー
ル流とスキッシュ流とが強く当らないので点火栓の掃気
が悪化するが、本発明では点火栓９が取付けられる頂面
４ａと側面４ｂとの交差部４ｃは、上述のように点火栓
９に向って曲率半径が徐々に大きくなっているので、点
火栓９に向うスワールの流れは交差部の壁面の抵抗を受
けにくくなるので、点火栓に到達し易くなり、点火栓の
掃気を向上させることができる。As shown in FIGS. 1 and 2, the top surface 4a of the recess 4 is
An ignition plug 9 is arranged at the intersection between the side surface 4b and the side surface 4b. As shown in FIGS. 5 and 6, the intersection 4c between the top surface 4a and the side surface 4b has a radius of curvature that gradually increases from the upstream side toward the spark plug 9 when viewed in the flow direction of the swirl. . In FIG. 2, a line 4d indicates the beginning of the curved surface from the top surface 4a to the intersection 4c. In the ignition plug 9, the intake swirl flow and the squish flow do not strongly contact each other, so the scavenging of the ignition plug deteriorates. However, in the present invention, the intersection 4c between the top surface 4a and the side surface 4b, where the ignition plug 9 is attached, is as described above. As the radius of curvature gradually increases toward the ignition plug 9, the swirl flow toward the ignition plug 9 is less likely to receive resistance from the wall surface of the intersection, making it easier to reach the ignition plug. can improve the scavenging of air.
なお、第２図において、シリンダヘッド平坦部と凹部の
側面４ｂとの交差部に曲面を形成しであるのは、この部
分がヒートポイントとなりノッキングを発生しないよう
にするためである。In FIG. 2, a curved surface is formed at the intersection of the flat portion of the cylinder head and the side surface 4b of the recessed portion in order to prevent this portion from becoming a heat point and causing knocking.
第１図は本発明の一実施例を示すエンジンの燃焼室部の
断面図、第２図はシリンダヘッドの内側からみた平面図
、第３図は第２図の■−■線断面図、第４図は第２図の
ＴＶ−ｒＶ線断面図、第５図は第２図の■−Ｖ線断面図
、第６図は第２図の■−■線断面図である。
１ａ・・・・・シリンダボア ２・・・・シリンダへッ
ト３・・・ピストン ４・・・・・・凹部 ４ａ ・・
頂面４ｂ・・・・・側面 ５・・・・・・燃焼室 ９・
・・・点火栓第１図
第２図
第３図
第４図
／
くも ７
第５図
０
第６図Fig. 1 is a sectional view of the combustion chamber of an engine showing an embodiment of the present invention, Fig. 2 is a plan view seen from the inside of the cylinder head, and Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2. 4 is a cross-sectional view taken along the line TV-rV in FIG. 2, FIG. 5 is a cross-sectional view taken along the line ■-V in FIG. 2, and FIG. 6 is a cross-sectional view taken along the line ■-■ in FIG. 1a... Cylinder bore 2... Cylinder head 3... Piston 4... Concavity 4a...
Top surface 4b...Side surface 5...Combustion chamber 9.
...Spark plug Figure 1 Figure 2 Figure 3 Figure 4 / Spider 7 Figure 5 0 Figure 6
Claims (1)
ヘッドに設けられた頂面および側面を有する凹部と、燃
焼室内に吸気スワールを生じるようにシリンダヘッドに
設けられた吸気ポートと、前記凹部の頂面と側面との交
差部近傍に位置するように前記シリンダヘッドに取付け
られた点火栓とを有し、前記凹部の頂面と側面とはスワ
ール上流側から前記点火栓に向って曲率半径が徐々に大
きくなる曲面で接続されたことを特徴とするエンジンの
燃焼室。a recess provided in the cylinder head to form a combustion chamber within the cylinder head and having a top and side surfaces; an intake port provided in the cylinder head to create an intake swirl in the combustion chamber; an ignition plug attached to the cylinder head so as to be located near the intersection of the surface and the side surface, and the top surface and the side surface of the recess have a radius of curvature that gradually increases from the swirl upstream side toward the spark plug. A combustion chamber of an engine characterized by being connected by a curved surface that increases in size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59084623A JPS60228722A (en) | 1984-04-26 | 1984-04-26 | Combustion chamber of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59084623A JPS60228722A (en) | 1984-04-26 | 1984-04-26 | Combustion chamber of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60228722A true JPS60228722A (en) | 1985-11-14 |
Family
ID=13835802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59084623A Pending JPS60228722A (en) | 1984-04-26 | 1984-04-26 | Combustion chamber of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60228722A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5857078A (en) * | 1981-10-01 | 1983-04-05 | Mazda Motor Corp | Igniter of engine |
| JPS60159330A (en) * | 1984-01-25 | 1985-08-20 | リカード コンサルテイング エンジニアーズ ピーエルシー | Spark ignition internal combustion engine |
-
1984
- 1984-04-26 JP JP59084623A patent/JPS60228722A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5857078A (en) * | 1981-10-01 | 1983-04-05 | Mazda Motor Corp | Igniter of engine |
| JPS60159330A (en) * | 1984-01-25 | 1985-08-20 | リカード コンサルテイング エンジニアーズ ピーエルシー | Spark ignition internal combustion engine |
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