JP4039393B2 - Cylinder head structure of direct-injection spark ignition internal combustion engine - Google Patents

Cylinder head structure of direct-injection spark ignition internal combustion engine Download PDF

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JP4039393B2
JP4039393B2 JP2004159343A JP2004159343A JP4039393B2 JP 4039393 B2 JP4039393 B2 JP 4039393B2 JP 2004159343 A JP2004159343 A JP 2004159343A JP 2004159343 A JP2004159343 A JP 2004159343A JP 4039393 B2 JP4039393 B2 JP 4039393B2
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cylinder head
pair
exhaust
intake
upper deck
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JP2004239275A (en
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豊 又吉
保之 岩出
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Nissan Motor Co Ltd
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    • 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
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    • 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

Description

本発明は、燃焼室内に燃料噴射弁から燃料を噴射し、点火プラグによって火花点火を行う直噴火花点火式内燃機関のシリンダヘッド構造に関する。   The present invention relates to a cylinder head structure of a direct injection spark ignition internal combustion engine in which fuel is injected from a fuel injection valve into a combustion chamber and spark ignition is performed by an ignition plug.

従来のこの種の直噴火花点火式内燃機関のシリンダヘッド構造としては、特許文献１に示すようなものがある。
図15に基づいて、その概要を説明すると、ピストン１１の冠面に凹み１１ａを形成し、機関の低負荷運転時には圧縮行程末期に凹み１１ａ内に向けて燃料噴射弁１２から燃料を噴射することにより、点火プラグ１３周りの限られた領域内にのみ混合気を形成する。 As a conventional cylinder head structure of this type of direct-injection spark-ignition internal combustion engine, there is one as shown in Patent Document 1.
The outline will be described with reference to FIG. 15. A recess 11a is formed in the crown surface of the piston 11, and fuel is injected from the fuel injection valve 12 into the recess 11a at the end of the compression stroke during low load operation of the engine. Thus, an air-fuel mixture is formed only in a limited area around the spark plug 13.

そして、クランキング開始後機関回転速度が予め定められた速度まで上昇する間は成層行程と圧縮行程末期の２回に分けて燃料を噴霧し、機関回転速度が予め定められた速度を超えた後は、圧縮行程末期に１回燃料を噴射するようにしている。
特開平６−２０７５４２号公報 Then, after the cranking starts, while the engine speed increases to a predetermined speed, fuel is sprayed in two times, the stratification stroke and the end of the compression stroke, and after the engine speed exceeds the predetermined speed The fuel is injected once at the end of the compression stroke.
JP-A-6-207542

しかしながら、このような従来の直噴火花点火式内燃機関のシリンダヘッド構造にあっては、燃料噴射弁１２は排気ポート１４とシリンダヘッド１５下面の間に横置きに配置され、燃料噴霧は、燃料噴射弁１２の中心軸より下側に偏向噴霧する構成となっていたため、燃料噴射弁１２が水平側に寝かせた状態で取り付けられ、噴霧方向を敢えて偏向させた噴霧偏向タイプとしているため、他の機関との共用化ができない。   However, in such a conventional direct injection spark ignition type internal combustion engine cylinder head structure, the fuel injection valve 12 is disposed horizontally between the exhaust port 14 and the lower surface of the cylinder head 15, Since the spray spray is configured to deflect downward from the central axis of the injection valve 12, the fuel injection valve 12 is attached in a state of being laid down horizontally and the spray deflection type in which the spray direction is intentionally deflected is used. Cannot be shared with institutions.

したがって、汎用型の燃料噴射弁として位置づけることが難しく、製造コストが高くつき、また、該偏向噴霧タイプはカーボン付着，取付誤差，加工精度等により信頼性を上げられず、組立方向が指定されるため、組立能率が極めて劣るといった問題があった。
本発明は、このような従来の問題点に鑑みなされたもので、燃料噴射弁、点火プラグの取付け位置を適切に設定し、更には、吸・排気ポート形状の工夫等によって上記問題点を解決した直噴火花点火式内燃機関のシリンダヘッド構造を提供することを目的とする。 Therefore, it is difficult to be positioned as a general-purpose fuel injection valve, and the manufacturing cost is high. In addition, the deflection spray type cannot be improved due to carbon adhesion, mounting error, processing accuracy, etc., and the assembly direction is designated. Therefore, there has been a problem that the assembly efficiency is extremely inferior.
The present invention has been made in view of such conventional problems, and appropriately sets the mounting positions of the fuel injection valve and the spark plug, and further solves the above problems by devising the shape of the intake and exhaust ports. An object of the present invention is to provide a cylinder head structure for a direct injection spark ignition type internal combustion engine.

このため、請求項１に係る発明は、
一対の吸気弁に対応する吸気ポートと一対の排気弁に対応する排気ポートとを設け、前記一対の排気ポートを排気下流端のシリンダヘッド端面近傍で１本の排気ポートに集合させるとともに、前記一対の吸気弁と一対の排気弁とで囲まれる燃焼室中央部分に燃料噴射弁の先端噴孔部を位置させ、前記一対の排気ポートの間に点火プラグを配設するとともにその先端電極部を前記一対の排気弁の間に位置させた直噴火花点火式内燃機関のシリンダヘッド構造において、
前記燃料噴射弁をシリンダヘッド下面に対して直立させ、
前記一対の排気弁を前記シリンダヘッド下面に対して傾斜させ、
前記点火プラグを前記シリンダヘッド下面に対して前記一対の排気弁の傾斜角度より小さい角度で前記一対の排気弁と同じ側に傾斜させ、
シリンダヘッドのアッパデッキを前記シリンダヘッド端面近傍まで延設して前記アッパデッキと前記排気ポートとの間に前記シリンダヘッド端面近傍まで延びる冷却水通路を設け、前記点火プラグの取付け用ボスの開口端部を前記アッパデッキから上方へ延びるシリンダヘッド側壁と前記アッパデッキの前記シリンダヘッド側壁よりも前記シリンダヘッド端面側へ延びる部分とにまたがらせてシリンダヘッドの外部へ突出するように形成し、
前記冷却水通路と前記排気ポートの下方に設けた冷却水通路とを前記一対の排気ポート間に設けた通路で連結するとともに、この連結通路を前記シリンダヘッド側壁よりも前記アッパデッキの下方に連なるシリンダヘッド端面側の領域に形成した
ことを特徴とする。 For this reason, the invention according to claim 1
An intake port corresponding to the pair of intake valves and an exhaust port corresponding to the pair of exhaust valves are provided, the pair of exhaust ports are gathered into one exhaust port in the vicinity of the cylinder head end face at the exhaust downstream end, and the pair of exhaust ports A front injection hole portion of the fuel injection valve is positioned in the center portion of the combustion chamber surrounded by the intake valve and the pair of exhaust valves, and a spark plug is disposed between the pair of exhaust ports and the front electrode portion thereof is In a cylinder head structure of a direct injection spark ignition internal combustion engine positioned between a pair of exhaust valves,
The fuel injection valve is upright with respect to the lower surface of the cylinder head;
Inclining the pair of exhaust valves with respect to the lower surface of the cylinder head;
Tilting the spark plug to the same side as the pair of exhaust valves at an angle smaller than the tilt angle of the pair of exhaust valves with respect to the lower surface of the cylinder head;
A cylinder head upper deck is extended to the vicinity of the cylinder head end surface, a cooling water passage extending to the cylinder head end surface is provided between the upper deck and the exhaust port, and an opening end portion of the boss for mounting the spark plug is provided. A cylinder head side wall extending upward from the upper deck and a portion extending to the cylinder head end face side of the cylinder head side wall of the upper deck are formed to protrude to the outside of the cylinder head ,
The cooling water passage and the cooling water passage provided below the exhaust port are connected by a passage provided between the pair of exhaust ports, and the connection passage is connected to the cylinder head side wall below the upper deck. It is characterized in that it is formed in a region on the head end face side .

このようにすれば、燃料噴射弁がシリンダヘッド下面に対して直立して取り付けられ、取付け角度を最大限大きく採ることができるため、噴霧偏向タイプ等の特殊な機能を有する必要がなく、製造コストを低減でき、組立の方向性管理が不要となるので組立能率も高められる。また、燃料噴射弁が燃焼室中心部に位置して配設され、排気ポートから離れているので、排気熱の影響を受けることなない。   In this way, the fuel injection valve is mounted upright with respect to the lower surface of the cylinder head, and the mounting angle can be maximized, so there is no need to have a special function such as a spray deflection type, and the manufacturing cost As the assembly direction is not required, the assembly efficiency can be improved. Further, since the fuel injection valve is disposed at the center of the combustion chamber and is away from the exhaust port, it is not affected by the exhaust heat.

さらに、車両に機関を組付けた状態で、容易に燃料噴射弁の交換が可能となり、組立整備時間の短縮が図れる。 Furthermore, it is possible to easily replace the fuel injection valve in a state where the engine is assembled to the vehicle, and the assembly and maintenance time can be shortened .

以下に、本発明の実施の形態を図に基づいて説明する。
図１〜図５は、本発明の一実施形態に係る直噴式火花点火機関のシリンダヘッド構造を示す。
構成から説明すると、シリンダヘッド21に形成された一対の排気ポート22と該排気ポート22を開閉する一対の排気弁23を駆動するための排気カムシャフト24との間に、点火プラグ25を配設する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a cylinder head structure of a direct injection spark ignition engine according to an embodiment of the present invention.
In terms of configuration, an ignition plug 25 is disposed between a pair of exhaust ports 22 formed in the cylinder head 21 and an exhaust camshaft 24 for driving a pair of exhaust valves 23 that open and close the exhaust ports 22. To do.

前記点火プラグ25の先端の電極部25ａを一対の排気弁が着座する一対の排気弁シート30の間に位置するように、点火プラグ25のボディ部25ｂを排気ポート22と排気カムシャフト24との間に着脱自由に取り付けられている。
燃料噴射弁26は、一対の排気弁23と一対の吸気弁27とで囲まれた燃焼室40中心部に位置し、シリンダ中心軸と同軸上に配設される。 The body portion 25b of the spark plug 25 is formed between the exhaust port 22 and the exhaust camshaft 24 so that the electrode portion 25a at the tip of the spark plug 25 is positioned between a pair of exhaust valve seats 30 on which a pair of exhaust valves are seated. It is attached freely in between.
The fuel injection valve 26 is located in the center of the combustion chamber 40 surrounded by the pair of exhaust valves 23 and the pair of intake valves 27, and is disposed coaxially with the cylinder center axis.

前記一対の吸気弁27は、一対の吸気弁シート28に着座され、吸気ポート29を開閉し、一対の排気弁23は、一対の排気弁シート30に着座され、排気ポート22を開閉する。
図３に示すように、吸気弁27にはバルブリフタ31が組み込まれ、吸気カムシャフト32により開閉制御される。同様に、排気弁23にもバルブリフタ33が組み込まれ、排気カムシャフト24により開閉制御される。 The pair of intake valves 27 are seated on a pair of intake valve seats 28 to open and close intake ports 29, and the pair of exhaust valves 23 are seated on a pair of exhaust valve seats 30 to open and close exhaust ports 22.
As shown in FIG. 3, a valve lifter 31 is incorporated in the intake valve 27 and is controlled to be opened and closed by an intake camshaft 32. Similarly, a valve lifter 33 is incorporated in the exhaust valve 23 and is controlled to be opened and closed by the exhaust camshaft 24.

図４に示すように、シリンダヘッド21には、燃料噴射弁取付用のボス34、図示しないバルブスプリングの取付座35、点火プラグ取付用のボス36等が形成されている。
次に、作用を説明する。
吸入空気は、図示しない吸気マニホールドからシリンダヘッド21内の吸気ポート29を介して吸気弁シート28からより燃焼室40内に吸い込まれる。 As shown in FIG. 4, the cylinder head 21 is formed with a fuel injection valve mounting boss 34, a valve spring mounting seat 35 (not shown), a spark plug mounting boss 36, and the like.
Next, the operation will be described.
The intake air is sucked from the intake valve seat 28 into the combustion chamber 40 via an intake port 29 in the cylinder head 21 from an unillustrated intake manifold.

また、燃料は、燃料噴射弁26を通過して、図示しないコントロールユニットからの制御信号により、噴孔部26ａから超微粒化した燃料が直接燃焼室40に噴霧される。
そして、図示しないピストンの圧縮と共に、点火プラグ25の点火により着火燃焼する。
ここで、燃料噴射弁26の噴孔部26ａが燃焼室40の中心部に位置し、点火プラグ25を排気ポート22と排気カムシャフト24との間に配設しているため、燃料噴射弁25がシリンダヘッド21下面に対して直立し (取付角度α＝９０°) 、その結果、噴霧偏向タイプ等の特殊な機能を有する必要がなく、低コストで製造でき、組立の方向性を管理する必要がないので組立能率も高められる。 Further, the fuel passes through the fuel injection valve 26, and the fuel atomized from the nozzle hole portion 26a is sprayed directly into the combustion chamber 40 by a control signal from a control unit (not shown).
Then, along with compression of a piston (not shown), the ignition plug 25 ignites and burns.
Here, since the injection hole portion 26a of the fuel injection valve 26 is located at the center of the combustion chamber 40 and the spark plug 25 is disposed between the exhaust port 22 and the exhaust camshaft 24, the fuel injection valve 25 Is upright with respect to the bottom surface of the cylinder head 21 (mounting angle α = 90 °). As a result, it is not necessary to have a special function such as a spray deflection type, and it can be manufactured at low cost and the direction of assembly must be managed. Since there is no, assembly efficiency can be improved.

また、燃料噴射弁25が燃焼室40中心部に位置するため、排気ポート側に配置したときのような熱の影響を受けることもない。
さらに、車両に機関を組付けた状態で、容易に燃料噴射弁25の交換が可能となり、組立整備時間の短縮が図れる。図６は、本発明の第２の実施形態を示す。
このものは、前記実施形態と同様の構成において、同一の燃焼室における一対の吸気弁シート41相互つまり図示しない吸気弁相互の間隔ｌ1 と一対の排気弁シート42相互つまり図示しない排気弁相互の間隔ｌ2 とをｌ1 ≠ｌ2 となるように吸気弁シート41及び排気弁シート42を配置したもので、このようにすることにより、ｌ1 ＝ｌ2 としたものに比較して同一シリンダボア径の場合、吸・排気弁の径を大きく確保することができる。 Further, since the fuel injection valve 25 is located at the center of the combustion chamber 40, it is not affected by heat unlike when it is disposed on the exhaust port side.
Further, the fuel injection valve 25 can be easily replaced with the engine assembled in the vehicle, and the assembly and maintenance time can be shortened. FIG. 6 shows a second embodiment of the present invention.
This is the same configuration as that of the above-described embodiment, in which the pair of intake valve seats 41 in the same combustion chamber, that is, the interval between the intake valves not shown in FIG. The intake valve seat 41 and the exhaust valve seat 42 are arranged so that l 1 is equal to l 1 ≠ l 2. By doing so, the cylinder bore diameter is the same as that when l 1 = l 2 . In this case, a large diameter of the intake / exhaust valve can be secured.

特に図７に示した第３の実施形態は、前記ｌ1 ＜ｌ2 となるように吸気弁シート51及び排気弁シート52を配置したもので、このようにすることにより、ｌ1 ＝ｌ2 としたものに比較して同一シリンダボア径の場合、排気弁の径を大きく確保することができる。
図８〜図13は、本発明の第４の実施形態を示す。
構成を説明すると、同一の燃焼室61における一対の排気ポート62を、それらの上流端開口部から下流端のシリンダヘッド端面に向けて略線対称軸となるセンターラインＣＬを設定したとき、前記一対の各排気ポート62が上流端部では下流側に向かって夫々センターラインＣＬに対して角度θずつ外側に拡げられ、中央部分から下流に向かうにつれて相互に内側に接近し、下流端部のシリンダヘッド端面63部分で集合して１つの排気ポートとなるように形成されている。 In particular, in the third embodiment shown in FIG. 7, the intake valve seat 51 and the exhaust valve seat 52 are arranged so that l 1 <l 2. By doing so, l 1 = l 2 Compared to the above, when the cylinder bore diameter is the same, a large exhaust valve diameter can be secured.
8 to 13 show a fourth embodiment of the present invention.
Explaining the configuration, when a pair of exhaust ports 62 in the same combustion chamber 61 is set with a center line CL that is substantially axisymmetrical axis from the upstream end opening toward the cylinder head end surface at the downstream end, Each of the exhaust ports 62 is expanded outward at an angle θ with respect to the center line CL toward the downstream side at the upstream end portion, and approaches the inner side toward the downstream from the central portion, and the cylinder head at the downstream end portion It is formed so as to be gathered at the end face 63 portion to form one exhaust port.

このようにすれば、点火プラグの取付用ボス64が、前記排気ポート62内に割り込みやすい形状となり、一対の排気弁相互の間隔を拡げることなく、点火プラグの電極部を配置できると共に、排気ポート62の断面積を確保しつつ、燃料噴射弁のボディ部を装着でき、シリンダヘッド全体をコンパクト化できる。図14は、本発明の第５の実施形態寺示す。
構成を説明すると、一対の排気ポート71内に割り込んで形成される点火プラグ取付用ボス72を、パイプ材により後付け形成したものである。 In this way, the spark plug mounting boss 64 has a shape that can easily be interrupted in the exhaust port 62, and the electrode portion of the spark plug can be disposed without increasing the distance between the pair of exhaust valves. The body part of the fuel injection valve can be mounted while securing the cross-sectional area of 62, and the entire cylinder head can be made compact. FIG. 14 shows a temple according to a fifth embodiment of the present invention.
Explaining the configuration, the spark plug mounting boss 72 formed by cutting into the pair of exhaust ports 71 is retrofitted with a pipe material.

このようにすれば、点火プラグ取付用ボス72がパイプ材で形成されるので、肉厚を最小限に薄く形成することができ、もって、排気ポート71や点火プラグ73周りの冷却水通路の通路断面積を確保することができ、ひいては、シリンダヘッド全体を可及的にコンパクト化できる。
以上説明してきたように請求項１に係る発明によれば、
燃料噴射弁のシリンダヘッド下面に対する取付角度を最大限大きく採れるため、噴霧偏向タイプ等の特殊な機能を有する必要がなく、製造コストを低減でき、組立の方向性管理が不要となるので組立能率も高められる。また、燃料噴射弁を燃焼室中心部に配置するため、排気熱の影響を受けることもなく、さらに、車両に機関を組付けた状態で、容易に燃料噴射弁の交換が可能となり、組立整備時間の短縮が図れる。 In this way, since the spark plug mounting boss 72 is formed of a pipe material, the wall thickness can be reduced to a minimum, so that the cooling water passage around the exhaust port 71 and the spark plug 73 can be formed. A cross-sectional area can be secured, and as a result, the entire cylinder head can be made as compact as possible.
As described above, according to the invention of claim 1,
Since the mounting angle of the fuel injection valve to the cylinder head bottom surface can be maximized, it is not necessary to have a special function such as a spray deflection type, which can reduce manufacturing costs and eliminates the need to manage the direction of assembly. Enhanced. In addition, because the fuel injection valve is located in the center of the combustion chamber, it is not affected by the exhaust heat, and it is possible to easily replace the fuel injection valve while the engine is assembled to the vehicle. Time can be shortened.

本発明の第１の実施形態の構成を示す縦断面図。1 is a longitudinal sectional view showing a configuration of a first embodiment of the present invention. 図１のＡ矢視図。The A arrow directional view of FIG. 図２のＢ−Ｂ断面図。BB sectional drawing of FIG. 図１のＣ−Ｃ断面図。CC sectional drawing of FIG. 図１のＤ矢視図。The D arrow line view of FIG. 本発明の第２の実施形態の構成を示す底面図。The bottom view which shows the structure of the 2nd Embodiment of this invention. 本発明の第３の実施形態の構成を示す底面図。The bottom view which shows the structure of the 3rd Embodiment of this invention. 本発明の第４の実施形態の縦断面図。The longitudinal cross-sectional view of the 4th Embodiment of this invention. 同じく横断面図。Similarly a cross-sectional view. 図８のＥ断面図。E sectional drawing of FIG. 図８のＦ断面図。F sectional drawing of FIG. 図８のＧ断面図。G sectional drawing of FIG. 図８のＨ断面図。H sectional drawing of FIG. 本発明の第５の実施形態の構成を示す底面図。The bottom view which shows the structure of the 5th Embodiment of this invention. 従来例を示す断面図。Sectional drawing which shows a prior art example.

符号の説明Explanation of symbols

21 シリンダヘッド
22 排気ポート
23 排気弁
24 排気カムシャフト
25 点火プラグ
25ａ 電極部
25ｂ ボディ部
26 燃料噴射弁
27 吸気弁
28 吸気弁シート
29 吸気ポート
30 吸気弁シート
33 吸気カムシャフト
34 燃料噴射弁の取付用ボス
36 点火プラグの取付用ボス
41 吸気弁シート
42 排気弁シート
51 吸気弁シート
52 排気弁シート
61 燃焼室
62 排気ポート
63 シリンダヘッド端面
64 点火プラグの取付用ボス
71 排気ポート
72 点火プラグの取付用ボス
73 点火プラグ
ＣＬ センターライン 21 Cylinder head
22 Exhaust port
23 Exhaust valve
24 Exhaust camshaft
25 Spark plug
25a Electrode section
25b Body part
26 Fuel injection valve
27 Intake valve
28 Intake valve seat
29 Intake port
30 Intake valve seat
33 Intake camshaft
34 Fuel injection valve mounting boss
36 Spark plug mounting boss
41 Intake valve seat
42 Exhaust valve seat
51 Intake valve seat
52 Exhaust valve seat
61 Combustion chamber
62 Exhaust port
63 Cylinder head end face
64 Spark plug mounting boss
71 Exhaust port
72 Spark plug mounting boss
73 Spark plug CL Center line

Claims (1)

一対の吸気弁に対応する吸気ポートと一対の排気弁に対応する排気ポートとを設け、前記一対の排気ポートを排気下流端のシリンダヘッド端面近傍で１本の排気ポートに集合させるとともに、前記一対の吸気弁と一対の排気弁とで囲まれる燃焼室中央部分に燃料噴射弁の先端噴孔部を位置させ、前記一対の排気ポートの間に点火プラグを配設するとともにその先端電極部を前記一対の排気弁の間に位置させた直噴火花点火式内燃機関のシリンダヘッド構造において、
前記燃料噴射弁をシリンダヘッド下面に対して直立させ、
前記一対の排気弁を前記シリンダヘッド下面に対して傾斜させ、
前記点火プラグを前記シリンダヘッド下面に対して前記一対の排気弁の傾斜角度より小さい角度で前記一対の排気弁と同じ側に傾斜させ、
シリンダヘッドのアッパデッキを前記シリンダヘッド端面近傍まで延設して前記アッパデッキと前記排気ポートとの間に前記シリンダヘッド端面近傍まで延びる冷却水通路を設け、前記点火プラグの取付け用ボスの開口端部を前記アッパデッキから上方へ延びるシリンダヘッド側壁と前記アッパデッキの前記シリンダヘッド側壁よりも前記シリンダヘッド端面側へ延びる部分とにまたがらせてシリンダヘッドの外部へ突出するように形成し、
前記冷却水通路と前記排気ポートの下方に設けた冷却水通路とを前記一対の排気ポート間に設けた通路で連結するとともに、この連結通路を前記シリンダヘッド側壁よりも前記アッパデッキの下方に連なるシリンダヘッド端面側の領域に形成したことを特徴とする直噴火花点火式内燃機関のシリンダヘッド構造。 An intake port corresponding to the pair of intake valves and an exhaust port corresponding to the pair of exhaust valves are provided, the pair of exhaust ports are gathered into one exhaust port in the vicinity of the cylinder head end face at the exhaust downstream end, and the pair of exhaust ports A front injection hole portion of the fuel injection valve is positioned in the center portion of the combustion chamber surrounded by the intake valve and the pair of exhaust valves, and a spark plug is disposed between the pair of exhaust ports and the front electrode portion thereof is In a cylinder head structure of a direct injection spark ignition internal combustion engine positioned between a pair of exhaust valves,
The fuel injection valve is upright with respect to the lower surface of the cylinder head;
Inclining the pair of exhaust valves with respect to the lower surface of the cylinder head;
Tilting the spark plug to the same side as the pair of exhaust valves at an angle smaller than the tilt angle of the pair of exhaust valves with respect to the lower surface of the cylinder head;
A cylinder head upper deck is extended to the vicinity of the cylinder head end surface, a cooling water passage extending to the cylinder head end surface is provided between the upper deck and the exhaust port, and an opening end portion of the boss for mounting the spark plug is provided. A cylinder head side wall extending upward from the upper deck and a portion extending to the cylinder head end face side of the cylinder head side wall of the upper deck are formed to protrude to the outside of the cylinder head ,
The cooling water passage and the cooling water passage provided below the exhaust port are connected by a passage provided between the pair of exhaust ports, and the connection passage is connected to the cylinder head side wall below the upper deck. A cylinder head structure for a direct-injection spark-ignition internal combustion engine, wherein the cylinder head structure is formed in a region on a head end face side .
JP2004159343A 2004-05-28 2004-05-28 Cylinder head structure of direct-injection spark ignition internal combustion engine Expired - Lifetime JP4039393B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004159343A JP4039393B2 (en) 2004-05-28 2004-05-28 Cylinder head structure of direct-injection spark ignition internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004159343A JP4039393B2 (en) 2004-05-28 2004-05-28 Cylinder head structure of direct-injection spark ignition internal combustion engine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP7250832A Division JPH0988714A (en) 1995-09-28 1995-09-28 Cylinder head structure for internal combustion engine of direct injection spark ignition type

Publications (2)

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JP2004239275A JP2004239275A (en) 2004-08-26
JP4039393B2 true JP4039393B2 (en) 2008-01-30

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