JP2829728B2 - Engine combustion chamber structure - Google Patents

Engine combustion chamber structure

Info

Publication number
JP2829728B2
JP2829728B2 JP62049431A JP4943187A JP2829728B2 JP 2829728 B2 JP2829728 B2 JP 2829728B2 JP 62049431 A JP62049431 A JP 62049431A JP 4943187 A JP4943187 A JP 4943187A JP 2829728 B2 JP2829728 B2 JP 2829728B2
Authority
JP
Japan
Prior art keywords
combustion chamber
cylinder
intake
piston
valve
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.)
Expired - Fee Related
Application number
JP62049431A
Other languages
Japanese (ja)
Other versions
JPS63215817A (en
Inventor
博之 小田
徹 白石
浩康 内田
稔益 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Matsuda KK
Original Assignee
Matsuda KK
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 Matsuda KK filed Critical Matsuda KK
Priority to JP62049431A priority Critical patent/JP2829728B2/en
Publication of JPS63215817A publication Critical patent/JPS63215817A/en
Application granted granted Critical
Publication of JP2829728B2 publication Critical patent/JP2829728B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00Cylinders; Cylinder heads 
    • F02F1/24Cylinder heads
    • F02F1/42Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/12Other methods of operation
    • F02B2075/125Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、エンジンの燃焼室構造に関し、燃焼室内の
混合気を成層化し、低燃費・高出力下を図るエンジンに
関する。 (従来技術及びその問題点) エンジンの燃焼形態としては、成層燃焼というものが
一般に知られている。これは、燃焼室内の点火プラグ近
傍に濃い混合気を又その周囲に希薄混合気を分布させて
混合気の成層化を図り、低い空燃費に於ても良好な燃焼
性を確保する為に、燃焼室の中央上部に燃焼室内に臨ん
で配置される燃料噴射弁から、所定のタイミングで燃焼
室内に燃料を直接噴射するものである。 その公知技術としては、実開昭58−56117号公報開示
の如く、シリンダヘッド下面とピストン頂面に形成した
キャビティとにより燃焼室を構成し、バッフル部材を設
置して該燃焼室を上下に2分割すると共に、点火プラグ
が臨ませられた上部室内に燃料を直接噴射することによ
り、上部室内に濃混合気層を形成するよう構成したもの
が提案されている。 さらに、特公昭35−13251号公報開示の如く、燃焼室
に臨み且つ点火プラグに向けて設置された燃料噴射弁に
より、燃料を点火プラグに向けて直接噴射するよう構成
したものも提案されている。 しかしながら、上記の公知技術では、燃焼室の一方の
側から燃焼室中央方向へ向けて燃料が噴射されるため、
噴射された燃料は、その慣性力によりプラグを通り越し
て飛散する懸念があり、成層化の促進には限界があっ
た。 (目的) 本発明は、簡単な形状変更で、より確実な混合気の成
層化を促進する燃焼室構造を提供することを目的とす
る。 (発明の構成) 上記目的達成のため、本発明に係るエンジンの燃焼室
構造は、 シリンダ(1A)とシリンダヘッド(4)下面とピスト
ン(2)頂面とで構成されるエンジンの燃焼室であっ
て、 該燃焼室には複数の吸気弁(10)により複数の吸気ポ
ートが開閉されると共に、吸気弁(10)の配列方向の一
側から見たシリンダヘッド(4)下面の側断面形状を、
吸気弁(10)が配置される吸気側の傾斜部と排気弁(1
1)が配置される排気側の傾斜部よりなる山形状とし、 前記吸気弁(10)の配列方向の一側から見て吸気弁
(10)と排気弁(11)により挟まれ、且つシリンダ(1
A)の軸線方向の上方から見てシリンダ(1A)の略中央
に位置するよう配置された点火プラグ(5)と、燃焼室
内に直接燃料を供給し点火プラグ周囲に濃混合気層を形
成する燃料噴射弁(6)と、を備えた4ストロークエン
ジンの燃焼室構造において、 前記燃料噴射弁(6)を吸気側の燃焼室周部に設ける
と共に、排気側へ向けて燃料が噴射されるようにし、 前記吸気弁(10)の配列方向の一側から見た燃焼室の
断面形状であって、シリンダ(1A)の略中央の側断面形
状において、前記ピストン(2)頂面の、前記シリンダ
ヘッド(4)下面の前記排気側の傾斜部に面する部位
に、該排気側の傾斜部に対応する傾斜部と前記燃焼室の
容積部を形成する容積部周縁形成の突部とを設け、 ピストン上死点における前記シリンダヘッド(4)下
面と前記ピストン(2)頂面とで構成される燃焼室の容
積部が、前記シリンダヘッド(4)の前記排気側の傾斜
部に対応して形成される容積よりも、前記吸気側の傾斜
部に対応して形成される容積が多くなるように形成さ
れ、 前記吸気弁(10)の配列方向の一側から見た前記シリ
ンダ(1A)の略中央の側断面形状における前記ピストン
(2)頂部の前記シリンダヘッド(4)側に最も突出す
る部位を前記排気側に面する前記突部の稜線とし、 燃焼室の容積部をシリンダ(1A)の軸線方向の上方か
ら見て、前記燃料噴射弁(6)側に偏位させ、且つ該容
積部内に点火プラグ(5)が位置するように配置させた
こと、 を特徴とするものである。また、前記一方の側を吸気
側、前記他方の側の排気側とする構成も可能である。さ
らに、前記吸気弁を2つ設け、前記燃料噴射弁をピスト
ン側から見て前記2つの吸気弁の間に設けても良い。 (作用) 請求項1に係る本発明のエンジンの燃焼室構造によれ
ば、(ア)燃焼室の容積部を燃焼噴射弁に近い側に偏位
させた(即ち燃焼噴射弁に近い側を大きくすると共に、
燃料噴射弁から離れた側を小さくする)こと、及び
(イ)ピストン頂面においてシリンダヘッド側に最も突
出する部位を、シリンダヘッドの燃料噴射弁から離れた
側の傾斜部に面する(ピストン頂面の)突起の稜線とし
たこと、によって、噴射燃料が燃料噴射弁から離れた
側に飛散するのを抑制する、ピストンの上昇に伴って
噴射燃料を点火プラグ側に向けて流動させ、点火プラグ
近傍の濃混合気層の形成即ち成層化を促進する、ピス
トン上死点時にシリンダヘッド下面とピストン頂面との
間に生成するスキッシュ流により燃焼を促進する、とい
う効果が達成される。 また、請求項2に係る本発明のエンジンの燃焼室構造
によれば、燃料噴射弁が吸気側に設けられているため、
高温になる排気側に設けられた場合に比べ、熱による損
傷を受けない。さらに、請求項3に係る本発明のエンジ
ンの燃焼室構造によれば、燃料噴射弁が排気側から遠い
位置にあるため、前述の請求項2による作用がさらに促
進される。 (発明の実施例) 本発明に係るエンジンの燃焼室構造を、ファンネル型
燃焼室と呼ばれる燃焼室に適用した場合に基づいて説明
する。第1図は、所謂ファンネル型燃焼室の基本構成を
示すためのものであり、第2図及び第3図は、本発明の
特徴的構成を採用したファンネル型燃焼室の実施例を示
すためのものである。 第1図に示すエンジンは、吸気バルブ10と排気バルブ
11を2組備えた4バルブ形式のシリンダ内燃料直接噴射
式4ストロークエンジンであり、シリンダブロック1に
形成したシリンダ1A内にピストンリング25、26、27、を
介して摺動可能に嵌挿されたピストン2が上下に往復運
動するよう構成されている。又、ピストン2の上下方向
往復運動は、コンロッド3を介して図示しないクランク
シャフトに回転運動として伝達されるよう構成されてい
る。 シリンダブロック1の上面には、ガスケット8を介し
てシリンダヘッド4が固定され、シリンダヘッド4の下
面には、逆じょうご型凹部45が形成されている。この逆
じょうご型凹部45は、第1図の側断面形状に示すよう
に、吸気側及び排気側の傾斜部よりなる山形状を構成し
ている。また、逆じょうご型凹部45には点火プラグ5が
先端を突出させて設置され、この点火バルブ5を挟んで
前記の吸気バルブ10と排気バルブ11が各々2つ配置され
ている。逆じょうご型凹部45とピストン2の頂面とによ
り燃焼室Xが規定されている。 このような基本構成であるファンネル型燃焼室におい
て、本発明の特徴的構成を採用した第2図及び第3図示
のものでは、噴射燃料Yが点火プラグ5を通り越して排
気側に集中するのを防止するため、燃料噴射弁6と離れ
た側のピストン頂面21が山形状に突出して形成されてい
る。そして、山形状の突出部分の、燃料噴射弁6に面し
ていない側には、ピストン2の上死点時にシリンダヘッ
ド下面41と近接するスキッシュ生成部Zを形成してい
る。 このように構成したことにより、ピストン2の上昇に
伴って噴射燃料Yが点火プラグ5側に向けて流動するた
め、点火プラグ5近傍の濃混合気層の形成即ち成層化が
促進され、さらに、ピストン上死点時にスキッシュ生成
部Zにより生成したスキッシュ流Tにより、燃焼が促進
される。 また、第2図に示すように、ピストン頂面21の突起以
外の部分は、なめらかな湾曲に形成されており、燃焼室
内の吸気流が抵抗少なく流動するため、燃焼効率が向上
する。 また、燃料噴射弁6は吸気側に設けられているため、
高温になる排気側に設けられた場合に比べ、熱による損
傷を受けない。さらに、第2図及び第3図に示すよう
に、燃料噴射弁6は排気側から遠い位置にあるため、熱
による損傷を受けないという効果がさらに促進される。 (発明の効果) 以上説明したように、本発明によるエンジンの燃焼室
構造によれば、簡単な形状変更で、より確実な混合気の
成層化と燃焼を促進することができる。
Description: TECHNICAL FIELD The present invention relates to a combustion chamber structure of an engine, and more particularly to an engine for stratifying an air-fuel mixture in a combustion chamber to achieve low fuel consumption and high output. (Prior art and its problems) As a combustion form of an engine, stratified combustion is generally known. This is because a rich mixture is distributed near the ignition plug in the combustion chamber and a lean mixture is distributed around it to stratify the mixture and ensure good combustion even at low air-fuel efficiency. The fuel is directly injected into the combustion chamber at a predetermined timing from a fuel injection valve arranged in the upper center of the combustion chamber facing the combustion chamber. As a known technique, as disclosed in Japanese Utility Model Application Laid-Open No. 58-56117, a combustion chamber is constituted by a lower surface of a cylinder head and a cavity formed in a top surface of a piston, and a baffle member is installed to vertically move the combustion chamber. There has been proposed a configuration in which a rich mixture layer is formed in the upper chamber by splitting and directly injecting fuel into the upper chamber facing the ignition plug. Further, as disclosed in Japanese Patent Publication No. 35-13251, a fuel injection valve which faces a combustion chamber and is installed toward a spark plug has been proposed in which fuel is directly injected toward a spark plug. . However, in the above-described known technology, fuel is injected from one side of the combustion chamber toward the center of the combustion chamber,
There is a concern that the injected fuel may scatter through the plug due to its inertia, and there is a limit to the promotion of stratification. (Purpose) An object of the present invention is to provide a combustion chamber structure which promotes more reliable stratification of an air-fuel mixture by a simple shape change. (Constitution of the Invention) In order to achieve the above object, a combustion chamber structure of an engine according to the present invention is a combustion chamber of an engine composed of a cylinder (1A), a lower surface of a cylinder head (4), and a top surface of a piston (2). A plurality of intake ports are opened and closed by the plurality of intake valves (10) in the combustion chamber, and a side cross-sectional shape of a lower surface of the cylinder head (4) viewed from one side in the arrangement direction of the intake valves (10). To
The intake-side inclined section where the intake valve (10) is located and the exhaust valve (1
1) is formed into a mountain shape formed by an inclined portion on the exhaust side on which the exhaust valve (10) is arranged between the intake valve (10) and the exhaust valve (11), and the cylinder ( 1
A) The ignition plug (5), which is disposed substantially at the center of the cylinder (1A) when viewed from above in the axial direction of A), and supplies fuel directly into the combustion chamber to form a rich mixture layer around the ignition plug. In a combustion chamber structure of a four-stroke engine provided with a fuel injection valve (6), the fuel injection valve (6) is provided around the combustion chamber on the intake side, and fuel is injected toward the exhaust side. In the sectional shape of the combustion chamber as viewed from one side in the arrangement direction of the intake valve (10), and in the sectional shape at the substantially center of the cylinder (1A), the top surface of the piston (2) An inclined portion corresponding to the exhaust-side inclined portion, and a projection for forming a volume peripheral edge forming a volume portion of the combustion chamber are provided at a portion of the lower surface of the head (4) facing the exhaust-side inclined portion; Lower surface and front of the cylinder head (4) at the piston top dead center The volume of the combustion chamber formed by the piston (2) and the top surface is more inclined to the intake-side inclined portion than to the volume formed corresponding to the exhaust-side inclined portion of the cylinder head (4). A correspondingly formed volume is formed to be large, and a top of the piston (2) in a substantially central side cross-sectional shape of the cylinder (1A) viewed from one side in the arrangement direction of the intake valve (10). A part protruding most toward the cylinder head (4) is defined as a ridgeline of the protrusion facing the exhaust side, and the volume of the combustion chamber is viewed from above in the axial direction of the cylinder (1A). 6) and is arranged so that the spark plug (5) is located in the volume. Further, a configuration is also possible in which the one side is an intake side and the other side is an exhaust side. Further, two intake valves may be provided, and the fuel injection valve may be provided between the two intake valves when viewed from the piston side. (Operation) According to the combustion chamber structure of the engine according to the first aspect of the present invention, (A) the volume of the combustion chamber is deviated to the side closer to the combustion injector (that is, the side closer to the combustion injector is larger). Along with
(A) A portion of the piston top surface that protrudes most toward the cylinder head faces an inclined portion of the cylinder head away from the fuel injection valve (piston top). The ridge of the projection prevents the injected fuel from being scattered to the side away from the fuel injection valve. The injected fuel flows toward the spark plug with the rise of the piston. The effect of promoting the formation or stratification of a nearby rich mixture layer and the effect of promoting combustion by the squish flow generated between the lower surface of the cylinder head and the top surface of the piston at the top dead center of the piston are achieved. Further, according to the combustion chamber structure of the engine of the present invention according to claim 2, since the fuel injection valve is provided on the intake side,
It is not damaged by heat as compared with the case where it is provided on the exhaust side where the temperature becomes high. Further, according to the combustion chamber structure of the engine according to the third aspect of the present invention, since the fuel injection valve is located far from the exhaust side, the operation according to the second aspect is further promoted. (Embodiment of the Invention) A description will be given based on a case where a combustion chamber structure of an engine according to the present invention is applied to a combustion chamber called a funnel type combustion chamber. FIG. 1 shows a basic configuration of a so-called funnel-type combustion chamber, and FIGS. 2 and 3 show an embodiment of a funnel-type combustion chamber adopting a characteristic configuration of the present invention. Things. The engine shown in FIG. 1 has an intake valve 10 and an exhaust valve.
This is a 4-valve in-cylinder direct fuel injection type 4-stroke engine having two sets of 11 and is slidably fitted through piston rings 25, 26 and 27 into a cylinder 1A formed in the cylinder block 1. The piston 2 is configured to reciprocate up and down. The vertical reciprocating motion of the piston 2 is configured to be transmitted as a rotational motion to a crankshaft (not shown) via the connecting rod 3. The cylinder head 4 is fixed on the upper surface of the cylinder block 1 via a gasket 8, and an inverted funnel-shaped recess 45 is formed on the lower surface of the cylinder head 4. The inverted funnel-shaped concave portion 45 has a mountain shape composed of inclined portions on the intake side and the exhaust side, as shown in the side sectional shape in FIG. In addition, the spark plug 5 is installed in the inverted funnel-shaped recess 45 with its tip protruding, and the intake valve 10 and the exhaust valve 11 are respectively arranged with the ignition valve 5 interposed therebetween. The combustion chamber X is defined by the inverted funnel-shaped recess 45 and the top surface of the piston 2. In the funnel type combustion chamber having such a basic configuration, the fuel injection Y passing through the ignition plug 5 and concentrating on the exhaust side is prevented in the configuration shown in FIGS. To prevent this, the piston top surface 21 on the side remote from the fuel injection valve 6 is formed to protrude in a mountain shape. A squish generating portion Z which is close to the cylinder head lower surface 41 at the time of the top dead center of the piston 2 is formed on the side of the mountain-shaped protruding portion not facing the fuel injection valve 6. With this configuration, the injection fuel Y flows toward the spark plug 5 with the rise of the piston 2, so that the formation of a rich mixture layer near the spark plug 5, that is, stratification is promoted. The combustion is promoted by the squish flow T generated by the squish generation unit Z at the time of the piston top dead center. Further, as shown in FIG. 2, the portion other than the projection of the piston top surface 21 is formed in a smooth curve, and the intake air in the combustion chamber flows with low resistance, so that the combustion efficiency is improved. Further, since the fuel injection valve 6 is provided on the intake side,
It is not damaged by heat as compared with the case where it is provided on the exhaust side where the temperature becomes high. Further, as shown in FIGS. 2 and 3, since the fuel injection valve 6 is located far from the exhaust side, the effect of not being damaged by heat is further promoted. (Effects of the Invention) As described above, according to the combustion chamber structure of the engine according to the present invention, stratification and combustion of the air-fuel mixture can be more reliably promoted by a simple shape change.

【図面の簡単な説明】 第1図は本発明に係るエンジンの燃焼室構造を適用する
燃焼室の基本構成を示す断面図、第2図は本発明に係る
エンジンの燃焼室構造の実施例を示す要部概略縦断面
図、第3図は本発明に係るエンジンの燃焼室構造の実施
例を示す要部概略平面図である。 1……シリンダブロック 1A……シリンダ 2……ピストン 21……ピストン頂面 25・26・27……ピストンリング 4……シリンダヘッド 5……点火プラグ 6……燃料噴射弁 X……燃焼室 Y……噴射燃料
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a basic configuration of a combustion chamber to which an engine combustion chamber structure according to the present invention is applied, and FIG. 2 is an embodiment of an engine combustion chamber structure according to the present invention. FIG. 3 is a schematic vertical sectional view of a main part, and FIG. 3 is a schematic plan view of a main part showing an embodiment of a combustion chamber structure of an engine according to the present invention. 1 ... Cylinder block 1A ... Cylinder 2 ... Piston 21 ... Piston top surface 25/26/27 ... Piston ring 4 ... Cylinder head 5 ... Spark plug 6 ... Fuel injection valve X ... Combustion chamber Y …… Injected fuel

───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 稔益 広島県安芸郡府中町新地3番1号 マツ ダ株式会社内 (56)参考文献 特開 昭48−20321(JP,A) 特開 昭61−250361(JP,A) 特開 昭61−250354(JP,A) 特開 昭61−244821(JP,A) 特開 昭48−72504(JP,A) 特開 昭52−18507(JP,A) 実開 昭61−202631(JP,U) 実開 昭51−94306(JP,U) 実公 昭50−2891(JP,Y2) 特公 昭35−13251(JP,B1) (58)調査した分野(Int.Cl.6,DB名) F02B 17/00 F02B 23/08 - 23/10────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Tanaka 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) References JP-A-48-20321 (JP, A) JP-A Sho 61-250361 (JP, A) JP-A-61-250354 (JP, A) JP-A-61-244821 (JP, A) JP-A-48-72504 (JP, A) JP-A-52-18507 (JP, A) A) Japanese Utility Model Showa 61-202631 (JP, U) Japanese Utility Model Showa 51-94306 (JP, U) Japanese Utility Model 50-50891 (JP, Y2) Japanese Patent Publication No. 35-13251 (JP, B1) (58) Survey Field (Int.Cl. 6 , DB name) F02B 17/00 F02B 23/08-23/10

Claims (1)

(57)【特許請求の範囲】 1.シリンダ(1A)とシリンダヘッド(4)下面とピス
トン(2)頂面とで構成されるエンジンの燃焼室であっ
て、 該燃焼室には複数の吸気弁(10)により複数の吸気ポー
トが開閉されると共に、吸気弁(10)の配列方向の一側
から見たシリンダヘッド(4)下面の側断面形状を、吸
気弁(10)が配置される吸気側の傾斜部と排気弁(11)
が配置される排気側の傾斜部よりなる山形状とし、 前記吸気弁(10)の配列方向の一側から見て吸気弁(1
0)と排気弁(11)により挟まれ、且つシリンダ(1A)
の軸線方向の上方から見てシリンダ(1A)の略中央に位
置するよう配置された点火プラグ(5)と、燃焼室内に
直接燃料を供給し点火プラグ周囲に濃混合気層を形成す
る燃料噴射弁(6)と、を備えた4ストロークエンジン
の燃焼室構造において、 前記燃料噴射弁(6)を吸気側の燃焼室周部に設けると
共に、排気側へ向けて燃料が噴射されるようにし、 前記吸気弁(10)の配列方向の一側から見た燃焼室の断
面形状であって、シリンダ(1A)の略中央の側断面形状
において、前記ピストン(2)頂面の、前記シリンダヘ
ッド(4)下面の前記排気側の傾斜部に面する部位に、
該排気側の傾斜部に対応する傾斜部と前記燃焼室の容積
部を形成する容積部周縁形成の突部とを設け、 ピストン上死点における前記シリンダヘッド(4)下面
と前記ピストン(2)頂面とで構成される燃焼室の容積
部が、前記シリンダヘッド(4)の前記排気側の傾斜部
に対応して形成される容積よりも、前記吸気側の傾斜部
に対応して形成される容積が多くなるように形成され、 前記吸気弁(10)の配列方向の一側から見た前記シリン
ダ(1A)の略中央の側断面形状における前記ピストン
(2)頂面の前記シリンダヘッド(4)側に最も突出す
る部位を前記排気側に面する前記突部の稜線とし、 燃焼室の容積部をシリンダ(1A)の軸線方向の上方から
見て、前記燃料噴射弁(6)側に偏位させ、且つ該容積
部内に点火プラグ(5)が位置するように配置させたこ
と、 を特徴とするエンジンの燃焼室構造。 2.前記排気側に面する前記突部の稜線は前記シリンダ
(1A)の軸線方向の上方から見て吸気側に円弧の中心を
持つ円弧状に形成されていること、を特徴とする請求項
1に記載のエンジンの燃焼室構造。 3.2つの吸気弁を備えると共に、前記燃料噴射弁を、
前記ピストン側から見て前記2つの吸気弁の間に配置し
たこと、を特徴とする請求項1又は2に記載のエンジン
の燃焼室構造。 4.シリンダ(1A)とシリンダヘッド(4)下面とピス
トン(2)頂面とで構成されるエンジンの燃焼室であっ
て、 シリンダヘッド(4)の下面の側断面形状を山形状と
し、 シリンダヘッド(4)の下面を、排気弁(11)が配置さ
れた第1傾斜面と、吸気弁(10)が配置された第2傾斜
面により構成すると共に、前記第1傾斜面と前記第2傾
斜面とが交わる稜線近傍で且つシリンダ(1A)の略中央
に点火プラグ(5)を配置し、 前記燃焼噴射弁(6)を前記燃焼室の周縁の吸気側に設
け、排気側へ向けて燃料を噴射するよう構成し、 前記シリンダ(1A)の略中央を通る側断面であって、且
つ前記シリンダヘッド(4)の前記側断面と同じ方向か
ら見た側断面において、前記ピストン(2)頂面におけ
る前記第1傾斜面の下方に位置する部分に、吸気側から
排気側に向けて隆起する隆起部を形成し、 前記ピストン(2)が上昇すると、前記燃料噴射弁
(6)から噴射された燃料が、前記ピストン(2)の隆
起部とシリンダヘッド(4)の前記第1傾斜面に沿って
回流して前記稜線に向かい、前記点火プラグ(5)まで
達するよう構成したこと、を特徴とするエンジンの燃焼
室構造。
(57) [Claims] A combustion chamber of an engine composed of a cylinder (1A), a lower surface of a cylinder head (4), and a top surface of a piston (2), wherein a plurality of intake ports are opened and closed by a plurality of intake valves (10) in the combustion chamber. In addition, the side cross-sectional shape of the lower surface of the cylinder head (4) viewed from one side in the arrangement direction of the intake valve (10) is changed to the intake-side inclined portion where the intake valve (10) is arranged and the exhaust valve (11).
Are arranged in a mountain shape formed by an inclined portion on the exhaust side on which the intake valve (10) is arranged.
0) and the exhaust valve (11), and the cylinder (1A)
A spark plug (5) arranged substantially at the center of the cylinder (1A) when viewed from above in the axial direction of the cylinder, and fuel injection for directly supplying fuel into the combustion chamber and forming a rich mixture layer around the spark plug A combustion chamber structure of a four-stroke engine provided with a valve (6), wherein the fuel injection valve (6) is provided in a peripheral portion of the combustion chamber on the intake side, and fuel is injected toward the exhaust side; In the sectional shape of the combustion chamber as viewed from one side in the arrangement direction of the intake valve (10), and in the sectional shape at the substantially center of the cylinder (1A), the cylinder head ( 4) At a portion of the lower surface facing the inclined portion on the exhaust side,
An inclined portion corresponding to the inclined portion on the exhaust side and a projection for forming a peripheral portion of the volume forming the volume of the combustion chamber are provided; the lower surface of the cylinder head (4) at the piston top dead center; and the piston (2). A volume portion of the combustion chamber constituted by the top surface is formed corresponding to the inclined portion on the intake side rather than a volume formed corresponding to the inclined portion on the exhaust side of the cylinder head (4). The cylinder head (1A) is formed so as to have a large volume, and the cylinder head (1A) has a cylinder head (1A) at the top surface of the cylinder (1A) in a side cross-sectional shape substantially at the center when viewed from one side in the arrangement direction of the intake valve (10). 4) The most protruding part on the side is the ridgeline of the projection facing the exhaust side, and the volume of the combustion chamber is on the side of the fuel injection valve (6) when viewed from above in the axial direction of the cylinder (1A). And the spark plug (5) is located in said volume. A combustion chamber structure for an engine, characterized in that, which is arranged so. 2. The ridgeline of the projection facing the exhaust side is formed in an arc shape having a center of an arc on the intake side when viewed from above in the axial direction of the cylinder (1A). The combustion chamber structure of the described engine. 3. With two intake valves and the fuel injection valve,
The combustion chamber structure of an engine according to claim 1, wherein the engine is disposed between the two intake valves as viewed from the piston side. 4. A combustion chamber of an engine comprising a cylinder (1A), a lower surface of a cylinder head (4), and a top surface of a piston (2). The lower surface of 4) is constituted by a first inclined surface on which an exhaust valve (11) is arranged, and a second inclined surface on which an intake valve (10) is arranged, and the first inclined surface and the second inclined surface are arranged. A spark plug (5) is arranged near a ridge line where the fuel injection valve intersects and substantially at the center of the cylinder (1A). The combustion injection valve (6) is provided on the intake side of the periphery of the combustion chamber, and fuel is directed toward the exhaust side. A top surface of the piston (2) in a side cross section passing through substantially the center of the cylinder (1A) and viewed in the same direction as the side cross section of the cylinder head (4). At a portion located below the first inclined surface at When the piston (2) ascends, the fuel injected from the fuel injection valve (6) and the protrusion of the piston (2) and the cylinder head ( 4) The combustion chamber structure of an engine, wherein the structure is arranged so as to circulate along the first inclined surface, head toward the ridge line, and reach the spark plug (5).
JP62049431A 1987-03-04 1987-03-04 Engine combustion chamber structure Expired - Fee Related JP2829728B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62049431A JP2829728B2 (en) 1987-03-04 1987-03-04 Engine combustion chamber structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62049431A JP2829728B2 (en) 1987-03-04 1987-03-04 Engine combustion chamber structure

Publications (2)

Publication Number Publication Date
JPS63215817A JPS63215817A (en) 1988-09-08
JP2829728B2 true JP2829728B2 (en) 1998-12-02

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2668680B2 (en) * 1987-03-19 1997-10-27 三菱自動車工業株式会社 In-cylinder gasoline injection engine
JPH086661B2 (en) * 1988-07-01 1996-01-29 トヨタ自動車株式会社 Fuel injection device for internal combustion engine
FR2750741B1 (en) * 1996-07-03 1998-11-06 Peugeot Motocycles Sa DIRECT FUEL INJECTION SYSTEM INTO A COMBUSTION CHAMBER OF AN INTERNAL COMBUSTION ENGINE CYLINDER
US6148792A (en) * 1997-02-01 2000-11-21 Ford Global Technologies, Inc. Direct injection spark ignition engine
DE69711933T2 (en) * 1997-02-01 2002-08-22 Ford Global Tech Inc DIRECTLY INJECTED SPARK IGNITION ENGINE

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61202631U (en) * 1985-06-07 1986-12-19

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