JPH10169453A - Structure of cylinder injection type internal combustion engine - Google Patents

Structure of cylinder injection type internal combustion engine

Info

Publication number
JPH10169453A
JPH10169453A JP8331046A JP33104696A JPH10169453A JP H10169453 A JPH10169453 A JP H10169453A JP 8331046 A JP8331046 A JP 8331046A JP 33104696 A JP33104696 A JP 33104696A JP H10169453 A JPH10169453 A JP H10169453A
Authority
JP
Japan
Prior art keywords
combustion chamber
cylinder
intake ports
cylinder head
fuel
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
Application number
JP8331046A
Other languages
Japanese (ja)
Inventor
Makoto Tanikake
誠 谷掛
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.)
Daihatsu Motor Co Ltd
Original Assignee
Daihatsu Motor Co Ltd
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 Daihatsu Motor Co Ltd filed Critical Daihatsu Motor Co Ltd
Priority to JP8331046A priority Critical patent/JPH10169453A/en
Publication of JPH10169453A publication Critical patent/JPH10169453A/en
Pending legal-status Critical Current

Links

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
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/48—Tumble motion in gas movement in cylinder
    • 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
    • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B23/104—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on a side position of the cylinder
    • 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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

PROBLEM TO BE SOLVED: To positively attain lean burning by inclining at least parts connected to opening parts to a combustion chamber, of two intake ports inward toward the lower side so that distance between them becomes gradually smaller toward a combustion chamber. SOLUTION: A pair of intake ports 6a, 6b opened to a combustion chamber 5 are formed on one side with the longitudinal centerline extended parallel with a crankshaft, placed in between, but in this case, a fuel supply port 14 is bored in a part, positioned between both intake ports 6a, 6b, of a cylinder head 2, and a fuel injector is provided therein. The middle parts, connected to the opening parts to the combustion chamber 5, of both intake ports 6a, 6b are formed inclining inward to a cylinder axis line 4a toward the lower side so that the distance between them becomes gradually smaller toward the combustion chamber 5. Tumbling flow therefore has strong influence on the vicinity of a spark plug so as to be able to hold the vicinity of the spark plug to a rich air-fuel ratio.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、気筒に対する燃料
を、これに空気を混合した状態で、当該気筒におけるシ
リンダ内に直接的に噴射供給するようにした筒内噴射式
内燃機関の構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a direct injection internal combustion engine in which fuel for a cylinder is directly injected into a cylinder of the cylinder while air is mixed with the fuel. It is.

【０００２】[0002]

【従来の技術】先行技術としての特開平５−２４００４
４号公報は、この種の筒内噴射式内燃機関として、シリ
ンダを有するシリンダブロックの上面に締結したシリン
ダヘッドのうち、平面視において前記シリンダの中心を
通ってクランク軸の方向に延びる長手中心線を挟んで一
方側に、前記シリンダヘッド下面の燃焼室に連通する二
つの吸気ポートを、他方側に、同じくシリンダヘッド下
面の燃焼室に連通する二つの排気ポートを形成して、前
記両吸気ポートのシリンダ内への開口部に吸気弁を、前
記両吸気ポートのシリンダ内への開口部に排気弁を各々
設け、前記両吸気ポートを、前記シリンダの軸線と略平
行のまま上向きに延長してシリンダヘッドの上面に開口
して、この両吸気ポートを介してエアクリーナからの吸
気をシリンダ内に導入することにより、シリンダ内に二
つのタンブル流（縦方向のスワール流）を形成する一
方、前記シリンダヘッドのうちシリンダにおける略中心
の部位に点火栓を配設し、更に、前記シリンダヘッドの
うち両吸気ポート間の部分に、有気燃料噴射型の燃料イ
ンジェクターを設けることにより、空気を混合した燃料
を、前記両タンブル流の間の部位に向かって噴出するよ
うに設けることを提案している。2. Description of the Related Art Japanese Patent Laid-Open No. 5-240004 as prior art.
Japanese Patent Application Laid-open No. 4 (1999) -1994 discloses a cylinder injection type internal combustion engine of this type, in a cylinder head fastened to the upper surface of a cylinder block having a cylinder, a longitudinal center line extending in the direction of the crankshaft through the center of the cylinder in plan view. Two intake ports communicating with the combustion chambers on the lower surface of the cylinder head on one side, and two exhaust ports communicating with the combustion chambers on the lower surface of the cylinder head on the other side. An intake valve is provided at an opening into the cylinder, and an exhaust valve is provided at an opening into the cylinder of the two intake ports, and the two intake ports are extended upward while being substantially parallel to the axis of the cylinder. By opening the upper surface of the cylinder head and introducing intake air from the air cleaner into the cylinder through both intake ports, two tumble flows ( A swirl flow in the same direction), an ignition plug is disposed at a substantially central portion of the cylinder in the cylinder head, and a portion of the cylinder head between the intake ports is provided with an aerated fuel injection type. It has been proposed to provide a fuel injector so that fuel mixed with air is ejected toward a portion between the two tumble flows.

【０００３】[0003]

【発明が解決しようとする課題】この先行技術による
と、両吸気ポートは、略真っ直ぐ上向きに延びているこ
とにより、シリンダ内に形成する二つのタンブル流を、
この両吸気ポートをシリンダヘッドの側面に開口するよ
うにベンド状に湾曲した場合よりも、強くすることがで
きる利点を有する。According to this prior art, the two intake ports extend substantially straight upward, so that two tumble flows formed in the cylinder are formed.
There is an advantage that both intake ports can be made stronger than in the case where they are bent in a bend shape so as to open to the side surface of the cylinder head.

【０００４】しかし、その反面、二つのタンブル流が、
互いに平行であることにより、その間に配設される点火
栓の付近に、強い乱流を発生することができないのであ
り、しかも、前記互いに平行な二つのタンブル流の間の
部分に、空気を混合した燃料が供給されると言う形態で
あって、空気と一緒に噴射された燃料は直ちに二つのタ
ンブル流に乗ることになって、点火栓の付近をリッチな
空燃比にすることができないから、前記点火栓の付近の
強い乱流が形成することができないことと相俟って、確
実なリーンバーンを達成することができないと言う問題
があった。However, on the other hand, two tumble flows,
By being parallel to each other, strong turbulence cannot be generated in the vicinity of the ignition plug disposed therebetween, and air is mixed in the portion between the two parallel tumble flows. The fuel injected together with the air immediately rides on the two tumble flows, making it impossible to achieve a rich air-fuel ratio in the vicinity of the spark plug. Along with the inability to form strong turbulence near the spark plug, there has been a problem that reliable lean burn cannot be achieved.

【０００５】本発明は、この問題を解消した筒内噴射式
内燃機関の構造を提供することを技術的課題とするもの
である。An object of the present invention is to provide a structure of a direct injection internal combustion engine that solves this problem.

【０００６】[0006]

【課題を解決するための手段】この技術的課題を達成す
るため本発明は、「シリンダを有するシリンダブロック
の上面に締結したシリンダヘッドのうち、平面視におい
て前記シリンダの中心を通ってクランク軸の方向に延び
る長手中心線を挟んで一方側に、前記シリンダヘッド下
面の燃焼室に連通する二つの吸気ポートを、他方側に、
同じく前記シリンダヘッド下面の燃焼室に連通する二つ
の排気ポートを形成し、前記両吸気ポートを、上向きに
延長してシリンダヘッドの上面に開口する一方、前記シ
リンダヘッドのうち燃焼室における略中心の部位に点火
栓を配設し、更に、前記シリンダヘッドのうち両吸気ポ
ート間の部分に、有気燃料噴射型の燃料インジェクター
を設けて成る筒内噴射式内燃機関において、前記両吸気
ポートのうち少なくとも燃焼室に対する開口部に連接す
る部分を、その間の距離が燃焼室に近づくにつれて次第
に小さくなるように下方に向かって互いに内向きに傾斜
する。」と言う構成にした。SUMMARY OF THE INVENTION In order to achieve this technical object, the present invention provides a cylinder head having a cylinder block fastened to the upper surface of a cylinder block having a cylinder through a center of the cylinder in a plan view. Two intake ports communicating with the combustion chamber on the lower surface of the cylinder head on one side with a longitudinal center line extending in the
Similarly, two exhaust ports communicating with the combustion chamber on the lower surface of the cylinder head are formed, and the two intake ports are extended upward and open to the upper surface of the cylinder head, while the cylinder head is substantially at the center in the combustion chamber. In a cylinder injection type internal combustion engine, a spark plug is provided at a position, and further, a portion of the cylinder head between the two intake ports is provided with a fuel injector of an aerated fuel injection type. At least the portions adjoining the openings to the combustion chamber are inclined inwardly downwardly from one another such that the distance therebetween becomes progressively smaller as it approaches the combustion chamber. ".

【０００７】[0007]

【発明の作用・効果】このように、両吸気ポートのうち
少なくとも燃焼室に対する開口部に連接する部分を、そ
の間の距離が燃焼室に近づくにつれて次第に小さくなる
ように下方に向かって互いに内向きに傾斜したことによ
り、この両吸気ポートからシリンダ内に吸気が流入する
ことでシリンダ内に発生する二つのタンブル流は、その
間の間隔が下方に行くにつれて次第に接近するように下
窄まりに傾斜することになる。As described above, at least the portions of the two intake ports which are connected to the opening to the combustion chamber are directed downward and inward so that the distance between them becomes gradually smaller as approaching the combustion chamber. Due to the inclination, the two tumble flows generated in the cylinder when the intake air flows into the cylinder from both the intake ports are inclined downward so that the distance between them gradually approaches as the distance between them decreases. become.

【０００８】つまり、両タンブル流は、その下流に行く
につれて次第に接近して、一つのタンブル流に合流する
ことにより、燃焼室の略中心の部位に設けられている点
火栓の付近にタンブル流の影響を強く及ぼすでき、且
つ、この二つのタンブル流の間に噴射された燃料を前記
点火栓の付近に寄せ集めることができて、点火栓の付近
に、強い乱流を付与することができると共に、点火栓の
付近をリッチな空燃比にすることができるから、リーン
バーンを確実に達成できる効果を有する。In other words, the two tumble flows gradually approach each other as they go downstream, and merge into one tumble flow, so that the tumble flows near the spark plug provided at a substantially central portion of the combustion chamber. In addition, the fuel injected between the two tumble flows can be strongly gathered near the spark plug, and strong turbulence can be imparted near the spark plug. Since the air-fuel ratio in the vicinity of the spark plug can be set to a rich air-fuel ratio, there is an effect that lean burn can be reliably achieved.

【０００９】[0009]

【発明の実施の形態】以下、本発明の実施の形態を、図
１〜図４の図面について説明する。この図において、符
号１は、シリンダブロックを、符号２は、前記シリンダ
ブロック１の上面に締結したシリンダヘッドを、符号３
は、前記シリンダブロック１におけるシリンダ４内を往
復動するピストンを各々示し、前記シリンダヘッド２の
下面のうち前記シリンダ４内の部分には、燃焼室５が凹
み形成されている。また、前記ピストン３の頂面には、
当該ピストン３が上死点まで上昇動したとき、前記燃焼
室５との間で略球形の燃焼空間を形成するようにした凹
所３ａが形成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In this figure, reference numeral 1 denotes a cylinder block, reference numeral 2 denotes a cylinder head fastened to the upper surface of the cylinder block 1, and reference numeral 3 denotes a cylinder head.
Represents a piston that reciprocates in the cylinder 4 of the cylinder block 1, and a combustion chamber 5 is formed in a recess in the cylinder 4 on the lower surface of the cylinder head 2. Also, on the top surface of the piston 3,
When the piston 3 moves up to the top dead center, a recess 3 a is formed to form a substantially spherical combustion space with the combustion chamber 5.

【００１０】符号６ａ，６ｂは、前記燃焼室５への一対
の吸気ポートを、符号７ａ，７ｂは、前記燃焼室５から
の一対の排気ポートを各々示し、前記両吸気ポート６
ａ，６ｂは、平面視において前記シリンダ４の中心を通
ってクランク軸（図示せず）と平行に延びる長手中心線
８を挟んで一方側に、その下端が前記燃焼室５内に他端
がシリンダヘッド２の上面２ａに各々開口するように形
成され、また、前記両排気ポート７ａ，７ｂは、平面視
において前記長手中心線８を挟んで他方側に、その下端
が前記燃焼室５内に他端がシリンダヘッド２の側面２ｂ
に各々開口するように形成されている。Reference numerals 6a and 6b denote a pair of intake ports to the combustion chamber 5, and reference numerals 7a and 7b denote a pair of exhaust ports from the combustion chamber 5, respectively.
a and 6b are located on one side with a longitudinal center line 8 extending in parallel with a crankshaft (not shown) passing through the center of the cylinder 4 in plan view, and the lower end thereof is inside the combustion chamber 5 and the other end thereof. The exhaust ports 7a and 7b are formed so as to open to the upper surface 2a of the cylinder head 2, respectively, and the exhaust ports 7a and 7b are located on the other side of the longitudinal center line 8 in plan view, and the lower end is located in the combustion chamber 5 in plan view. The other end is the side 2b of the cylinder head
Are formed so as to be respectively opened.

【００１１】前記両吸気ポート６ａ，６ｂにおける燃焼
室５内への開口部には、吸気弁９ａ，９ｂが、前記両排
気ポート７ａ，７ｂにおける燃焼室５内への開口部に
は、排気弁１０ａ，１０ｂが各々設けられている。ま
た、前記シリンダヘッド２には、点火栓１１が、当該点
火栓１１における電極部が、前記燃焼室５内における略
中心にのぞむように装着されている。An intake valve 9a, 9b is provided at an opening of the intake port 6a, 6b into the combustion chamber 5, and an exhaust valve is provided at an opening of the exhaust port 7a, 7b into the combustion chamber 5. 10a and 10b are provided respectively. An ignition plug 11 is mounted on the cylinder head 2 such that an electrode portion of the ignition plug 11 looks substantially at the center in the combustion chamber 5.

【００１２】更にまた、前記シリンダヘッド２のうち両
吸気ポート６ａ，６ｂ間の部分には、燃料供給ポート１
４を穿設し、この燃料供給ポート１４に、有気燃料噴射
型の燃料インゼェクター１２を設けて、この燃料インゼ
ェクター１２から燃料と空気との混合物を、シリンダ３
内に向かって斜め下向きに噴出するように構成する。そ
して、前記両吸気ポート６ａ，６ｂのうち、前記燃焼室
５に対する開口部に連接する中程部分を、その間の距離
が燃焼室５に近づくにつれて次第に小さくなるように、
下方に向かってシリンダ３の軸線３ａに対して適宜角度
θだけ内向きに傾斜するように形成する。Further, a fuel supply port 1 is provided between the intake ports 6a and 6b of the cylinder head 2.
A fuel injection port 12 is provided in the fuel supply port 14, and a fuel injector 12 of an aerated fuel injection type is provided. A mixture of fuel and air is supplied from the fuel injector 12 to the cylinder 3.
It is configured so as to squirt obliquely downward toward the inside. The middle part of the two intake ports 6a and 6b connected to the opening to the combustion chamber 5 is gradually reduced as the distance between them approaches the combustion chamber 5.
It is formed so as to incline downward by an appropriate angle θ with respect to the axis 3a of the cylinder 3 as appropriate.

【００１３】この構成において、ピストン４の下降動に
よる吸気行程に際して、シリンダ３内には、二つの吸気
ポート６ａ，６ｂから吸気が導入されることにより、図
に矢印１５ａ，１５ｂで示すように、二つのタンブル流
が形成される。この場合において、前記両吸気ポート６
ａ，６ｂのうち燃焼室５に対する開口部に連接する部分
が、その間の距離が燃焼室５に近づくにつれて次第に小
さくなるように、下方に向かってシリンダ３の軸線３ａ
に対して適宜角度θだけ内向きに傾斜していることによ
り、前記両タンブル流１５ａ，１５ｂは、その間の間隔
が下方に行くにつれて次第に接近するように下窄まりに
傾斜することになる。In this configuration, during the intake stroke caused by the downward movement of the piston 4, the intake air is introduced into the cylinder 3 from the two intake ports 6a and 6b, so as to be indicated by arrows 15a and 15b in the drawing. Two tumble streams are formed. In this case, the two intake ports 6
The axis 3a of the cylinder 3 is directed downward so that the portion of the cylinders 3a and 6b connected to the opening with respect to the combustion chamber 5 becomes gradually smaller as the distance between them approaches the combustion chamber 5.
, The two tumble flows 15a, 15b incline downward so that the distance between them gradually approaches as the distance between them decreases.

【００１４】従って、両タンブル流１５ａ，１５ｂは、
その下流に行くにつれて次第に接近して、一つのタンブ
ル流に合流することになって、燃焼室５の略中心の部位
に設けられている点火栓１１の付近にタンブル流の影響
を強く及ぼすことができるから、点火栓１１の付近に強
い乱流を形成できるのである。しかも、前記タンブル流
１５ａ，１５ｂは、その下流に行くにつれて次第に接近
して、一つのタンブル流に合流することにより、前記吸
気行程の後半の時期において前記燃料インゼェクター１
２から空気と一緒に噴出された燃料を、前記点火栓１１
の付近に寄せ集めることができるから、点火栓の付近を
リッチな空燃比にすることができるのである。Therefore, both tumble flows 15a, 15b are:
As it goes downstream, it gradually approaches and merges into one tumble flow, so that the influence of the tumble flow on the vicinity of the ignition plug 11 provided at a substantially central portion of the combustion chamber 5 can be reduced. As a result, a strong turbulent flow can be formed near the ignition plug 11. In addition, the tumble flows 15a and 15b gradually approach each other as they go downstream, and merge into one tumble flow, so that the fuel injector 1 in the latter half of the intake stroke.
The fuel ejected together with the air from
Therefore, a rich air-fuel ratio can be obtained in the vicinity of the ignition plug.

【００１５】なお、前記実施の形態は、両吸気ポート６
ａ，６ｂにおける中程部分のみを、下方に向かって内向
きに傾斜した場合を示すしたが、本発明はこれに限ら
ず、両吸気ポート６ａ，６ｂの全体を、下方に向かって
内向きに傾斜するように形成しても良いことはと言うま
でもない。It should be noted that in the above embodiment, both intake ports 6
Although the case where only the middle portion of the intake ports 6a and 6b is inclined downward and inward is shown, the present invention is not limited to this, and the entirety of both the intake ports 6a and 6b are directed downward and inward. It goes without saying that it may be formed so as to be inclined.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の実施の形態を縦断正面図で図２のＩ−
Ｉ視断面図である。FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention.
It is I sectional drawing.

【図２】図１のII−II底面図である。FIG. 2 is a II-II bottom view of FIG.

【図３】図２のIII −III 視断面図である。FIG. 3 is a sectional view taken along line III-III of FIG. 2;

【図４】図２及び図３のIV−IV視断面図である。FIG. 4 is a sectional view taken along line IV-IV of FIGS. 2 and 3;

【符号の説明】[Explanation of symbols]

１ シリンダブロック ２ シリンダヘッド ２ａ シリンダヘッドの上面 ３ シリンダ ３ａ シリンダの軸線 ４ ピストン ５ 燃焼室 ６ａ，６ｂ 吸気ポート ７ａ，７ｂ 排気ポート ８ 長手中心線 ９ａ，９ｂ 吸気弁 １０ａ，１０ｂ 排気弁 １１ 点火栓 １２ 燃料インジェクター １４ 燃料供給ポート １５ａ，１５ｂ タンブル流 Reference Signs List 1 cylinder block 2 cylinder head 2a upper surface of cylinder head 3 cylinder 3a cylinder axis 4 piston 5 combustion chamber 6a, 6b intake port 7a, 7b exhaust port 8 longitudinal center line 9a, 9b intake valve 10a, 10b exhaust valve 11 spark plug 12 Fuel injector 14 Fuel supply port 15a, 15b Tumble flow

フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ０２Ｍ 61/14 ３１０ Ｆ０２Ｍ 61/14 ３１０Ａ Continued on the front page (51) Int.Cl. 6 Identification code FI F02M 61/14 310 F02M 61/14 310A

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】シリンダを有するシリンダブロックの上面
に締結したシリンダヘッドのうち、平面視において前記
シリンダの中心を通ってクランク軸の方向に延びる長手
中心線を挟んで一方側に、前記シリンダヘッド下面の燃
焼室に連通する二つの吸気ポートを、他方側に、同じく
前記シリンダヘッド下面の燃焼室に連通する二つの排気
ポートを形成し、前記両吸気ポートを、上向きに延長し
てシリンダヘッドの上面に開口する一方、前記シリンダ
ヘッドのうち燃焼室における略中心の部位に点火栓を配
設し、更に、前記シリンダヘッドのうち両吸気ポート間
の部分に、有気燃料噴射型の燃料インジェクターを設け
て成る筒内噴射式内燃機関において、 前記両吸気ポートのうち少なくとも前記燃焼室に対する
開口部に連接する部分を、その間の距離が燃焼室に近づ
くにつれて次第に小さくなるように下方に向かって互い
に内向きに傾斜したことを特徴とする筒内噴射式内燃機
関の構造。1. A cylinder head fastened to an upper surface of a cylinder block having a cylinder, the cylinder head lower surface being disposed on one side with a longitudinal center line extending in the direction of a crankshaft passing through the center of the cylinder in plan view. Two intake ports communicating with the combustion chamber of the cylinder head are formed on the other side, and two exhaust ports communicating with the combustion chamber on the lower surface of the cylinder head are formed on the other side. On the other hand, an ignition plug is disposed at a substantially central portion in the combustion chamber of the cylinder head, and further, an aerated fuel injection type fuel injector is provided in a portion between the two intake ports of the cylinder head. In a direct injection type internal combustion engine comprising: a portion connected to at least an opening to the combustion chamber of the two intake ports, A structure of a direct injection internal combustion engine, characterized in that the distances incline downward and inwardly so that the distance gradually decreases as approaching the combustion chamber.
JP8331046A 1996-12-11 1996-12-11 Structure of cylinder injection type internal combustion engine Pending JPH10169453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8331046A JPH10169453A (en) 1996-12-11 1996-12-11 Structure of cylinder injection type internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8331046A JPH10169453A (en) 1996-12-11 1996-12-11 Structure of cylinder injection type internal combustion engine

Publications (1)

Publication Number Publication Date
JPH10169453A true JPH10169453A (en) 1998-06-23

Family

ID=18239243

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8331046A Pending JPH10169453A (en) 1996-12-11 1996-12-11 Structure of cylinder injection type internal combustion engine

Country Status (1)

Country Link
JP (1) JPH10169453A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065105A1 (en) * 2000-03-03 2001-09-07 Orbital Engine Company (Australia) Pty Limited Internal combustion engines and control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065105A1 (en) * 2000-03-03 2001-09-07 Orbital Engine Company (Australia) Pty Limited Internal combustion engines and control
US6854440B2 (en) 2000-03-03 2005-02-15 Orbital Engine Company (Australia) Pty Limited Internal combustion engines and control

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