JP4285621B2 - Mounting structure of fuel injection valve - Google Patents

Mounting structure of fuel injection valve Download PDF

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Publication number
JP4285621B2
JP4285621B2 JP2000300672A JP2000300672A JP4285621B2 JP 4285621 B2 JP4285621 B2 JP 4285621B2 JP 2000300672 A JP2000300672 A JP 2000300672A JP 2000300672 A JP2000300672 A JP 2000300672A JP 4285621 B2 JP4285621 B2 JP 4285621B2
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Japan
Prior art keywords
fuel injection
injection valve
seal member
water jacket
tip
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JP2002106444A (en
Inventor
和裕 山本
浩 五十嵐
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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    • 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
    • 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
    • F02B23/101—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 or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts
    • 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

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  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、筒内直噴エンジンにおける、シリンダヘッドへの燃料噴射弁の取付部構造に関するものである。
【０００２】
【従来の技術】
筒内直噴エンジンでは、燃料噴射弁は燃焼室に直接臨むようにシリンダヘッドに取付けられる。図２は従来から広く用いられている燃料噴射弁の取付部構造の断面図であり、001はシリンダヘッド、002は燃焼室、003は該シリンダヘッドに穿設されている燃料噴射弁装着孔、004は該装着孔に装着されている燃料噴射弁、005は該燃料噴射弁の先端部、006は該先端部に隣接している大径部、007は該燃料噴射弁装着孔の一部をなす先端部収容孔、008は該先端部収容孔に隣接する座面、009は該大径部006の端面と該座面008との間に介装されている端面シール部材であり、また010は該先端部に設けてある噴孔である。図には噴孔の断面を示してある。
【０００３】
この構造は、燃料噴射弁004の先端部005に隣接する大径部006の端面を、シール部材009を介して座面008に押し当てる端面シール構造であり、シール部材009を容易に変形させることができるが、シール位置が燃焼室002から隔たった奥の方にあるため、全長Ｈ1 の先端部005全体が高温の燃焼ガスに曝され、先端部005が高温となり、噴孔010の周辺にカーボンが付着し、堆積し易い。
【０００４】
このカーボン付着の低減を図るために、燃料噴射弁の本体フランジ部をシリンダヘッドに押圧し、本体フランジ部よりも先の部位とシリンダヘッドとの間に形成された軸方向隙間に、燃料噴射弁と同等若しくはそれよりも大きな熱伝導率を有する金属製のガスケットを介設し、その周囲にウオータジャケットを設けた燃料噴射弁の取付部構造（特開平10-252609号公報）があった。
【０００５】
燃焼室から燃料噴射弁に伝達される熱は、熱伝導率の高い金属製のガスケットを通ってシリンダヘッドに効率良く伝えられ、また燃料噴射弁の本体と金属製ガスケットの周囲に設けられるウオータジャケットにより、燃料噴射弁のシール位置周辺を冷却することはできるが、高温の燃焼ガスに曝される燃料噴射弁の先端部の表面積は減少されず、先端部におけるカーボン付着の抑制効果が低かった。
【０００６】
この改善のため、燃焼室に直接臨む燃料噴射弁の先端部の外周に軸シール部材を装着し、高温の燃焼ガスに曝される先端部の表面積を減少させ、噴孔周辺の温度を低下させ、カーボンの付着を減少させるものもあったが、シール部材が燃焼室により近く配設されるため、シール部材の熱劣化が懸念された。
【０００７】
【発明が解決しようとする課題】
本発明の目的は、筒内直噴エンジンの燃料噴射弁の噴孔におけるカーボンの付着を防止し、安定した燃料噴射を図るものである。
【０００８】
【課題を解決するための手段および効果】
本発明はこのような課題を解決した燃料噴射弁の取付部構造の改良に係り、請求項１の発明は、筒内直噴エンジンのシリンダヘッドに装着される燃料噴射弁の取付部構造において、前記燃料噴射弁を、燃焼室の直上で前記シリンダヘッドに形成された燃料噴射弁装着孔から前記燃焼室に向けて取り付け、前記シリンダヘッドには、前記燃料噴射弁の先端部が収容される先端部収容孔を形成するとともに、前記燃料噴射弁の先端部が前記燃焼室内に露出するようにし、前記燃料噴射弁の先端部の外周と前記先端部収容孔との間にシール部材を配設するとともに、前記シール部材の周囲を覆うようにウォータジャケットを設け、前記ウォータジャケットの底部を、前記燃焼室に最も近い位置まで延設するとともに、前記シール部材よりも下方に延設し該シール部材の周囲を覆うように形成したことを特徴とする。
また、請求項２の発明は、請求項１に記載の燃料噴射弁の取付部構造において、前記シール部材の全周を覆うように前記ウォータジャケットを形成すると共に、前記ウォータジャケットの底部側方に点火プラグを近接して配設したことを特徴とする。
【０００９】
請求項１の発明は、前述したように構成されているため、燃料噴射弁の先端部の外周にシール部材を配設することによって、高温の燃焼ガスに曝される先端部の表面積を減らすとともに、燃焼ガスの流入量を減らして先端部の温度上昇を減少させ、カーボン付着を低減させることができる。
【００１０】
また、シール部材の周囲を覆うようにウオータジャケットを形成することによって、ウオータジャケット内を流れる冷却水によりシール部材を積極的に冷却し、シール部材の耐久性の向上を図ることができ、燃料噴射弁の先端部の温度上昇を減少させ、噴孔へのカーボン付着を低減し、安定した燃料噴射が可能となる。
【００１１】
さらに、請求項１記載のように発明を構成することにより、燃料噴射弁の先端部が露出される燃焼室廻りまで冷却水を積極的に流すことにより、シール部材に対するウオータジャケットの冷却作用も大きく、シール部材の耐久性を更に向上させ、噴孔周辺のカーボン付着を低減することが可能となる。
【００１２】
さらにまた、請求項２記載のように発明を構成することによって、ウオータジャケットがシール部材の全周で連通することにより、冷却水の流れを阻害することなく冷却効率も向上し、燃焼室内に露出する燃料噴射弁と点火プラグそれぞれの先端部がコンパクトに隣接配置されると共に、それぞれの先端部廻りまで冷却水を積極的に流すことによって、燃焼室廻りの冷却作用も大きく、シール部材ならびに点火プラグの耐久性をより一層向上し、燃焼も促進され、安定した燃料噴射が可能となる。
【００１３】
【発明の実施の形態】
図１は本発明の一実施形態に係る筒内直噴エンジンのシリンダヘッドに装着される燃料噴射弁の取付部構造の断面図である。図において、１はシリンダヘッド、２は燃焼室、３は燃料噴射弁装着孔、４は燃料噴射弁、５は該燃料噴射弁の先端部、７は該先端部が収容されている先端部収容孔、20は該シリンダヘッド１に取付けられる点火プラグ、21はシリンダヘッド１に形成されるウオータジャケットであり、それぞれが連通して冷却水が循環される。
【００１４】
燃料噴射弁４は、シリンダヘッド１に形成され燃焼室２の直上に形成される燃料噴射弁装着孔３から該燃焼室２に向けて取付けられ、燃料噴射弁の先端部５を該燃焼室２内に露出させ、該燃料噴射弁４に一体形成されるフランジ部22によって該シリンダヘッド１の固定座面23に押し当て固定されると共に、該燃料噴射弁の先端部５は該シリンダヘッド１の先端部収容孔７の内面との間に形成される隙間において、該先端部５外周の環状溝11に嵌装されたシール部材12によって燃焼ガスを軸シールし、該シール部材12は弾性材であるＰＴＦＥ等のフッ素樹脂から形成される。
【００１５】
点火プラグ20は、シリンダヘッド１に形成される燃料噴射弁装着孔３に隣接した位置で、該燃料噴射弁装着孔３に対して斜めに取付けられ、点火プラグ20の先端部を燃焼室２内に露出させて該シリンダヘッド１に固定される。
【００１６】
ウオータジャケット21は、燃料噴射弁４の全周に形成される隔壁24を介して該燃料噴射弁４に隣接し、同じく点火プラグ20の周囲に形成される隔壁25を介して該点火プラグに隣接し、該ウオータジャケット21は該燃料噴射弁４と該点火プラグ20の周囲を覆うように形成される。
【００１７】
また、前記ウオータジャケット21には、燃焼室２に最も近い位置まで延設されるウオータジャケットの底部26が形成され、該ウオータジャケットの底部26はシール部材12の下縁を含む平面Ａ-Ａより下方へ伸びて、該シール部材12の周囲を覆うように形成される。
【００１８】
さらに、前記ウオータジャケットの底部26は、前記シール部材12の全周を覆うように形成され、前記燃料噴射弁４と前記ウオータジャケット21の間に形成される隔壁27の厚さＢは、強度上および耐熱性上許される範囲で薄く形成される。
【００１９】
図１に図示の実施の形態は前述したように構成されているので、燃焼室２廻りのシリンダヘッド１ならびに燃料噴射弁４の先端部５、特に燃焼室２に露出するシール部材12より下方の部分は、エンジン稼動中常に高温の燃焼ガスに曝され続け、燃焼ガスによる熱の伝達を受けるが、ウオータジャケット内を流れる冷却水によって冷却される。
【００２０】
また、これと同じに燃焼ガスによる熱の伝達を受けるシール部材12も、周囲をウオータジャケットで覆うように形成されることから、シール部材12を積極的に冷却することができる。
【００２１】
このように、シール部材12の受ける熱はウオータジャケット21内を流れる冷却水との熱交換によって除去されるため、シール部材12の温度上昇を抑制でき、シール部材12の熱劣化が防止され、長期にわたりシール性能を維持できる。
【００２２】
さらに、シール部材12を通して燃料噴射弁４の先端部５の冷却作用も増すので、燃料噴射弁４の噴孔10（図には断面が示してある）におけるカーボンの付着も低減でき、安定した燃料噴射が可能となる。
【００２３】
また、シール部材12の周囲の少なくとも一部を覆うウオータジャケット21により、燃料噴射弁４の噴孔10におけるカーボン付着を低減できるが、シール部材12の全周を覆うウオータジャケット21によって、更に効率良く冷却することが可能であり、燃料噴射弁４の先端部５におけるシール部材12の周囲に限らず、シリンダヘッド１内に挿入される燃料噴射弁４の略全周を覆うように配置することによって、燃料噴射弁４全体の冷却にも効果があり、燃焼室２廻りの冷却作用も大きく、シール部材12ならびに点火プラグ20の耐久性を向上し、燃焼も促進され、安定した燃料噴射が可能となる。
【００２４】
さらに、点火プラグ20と燃料噴射弁４との間にウオータジャケット21が介在することで、点火プラグ20から燃料噴射弁４へ伝わる熱も低減され、シール部材21の耐久性をより一層向上させることができる。
【００２５】
さらにまた、燃料噴射弁４とウオータジャケット21との間に形成される隔壁27の厚さを十分に薄く形成することで、燃焼ガスとウオータジャケット21内を流れる冷却水との熱交換が一層促進され、燃料噴射弁４の先端部５ならびにシール部材12における冷却作用をより一層向上させることができる。
【００２６】
同様に、燃料噴射弁廻りの隔壁24ならびに点火プラグ廻りの隔壁25の厚さを薄く形成することで、燃料噴射弁４ならびに点火プラグ20における冷却作用をより一層向上させることができる。
【図面の簡単な説明】
【図１】本発明に係る燃料噴射弁の取付部構造を示す断面図である。
【図２】従来の燃料噴射弁の取付部構造を示す断面図である。
【符号の説明】
１…シリンダヘッド、２…燃焼室、３…燃料噴射弁装着孔、４…燃料噴射弁、５…先端部、７…先端部収容孔、10…噴孔、11…先端部外周の環状溝、12…シール部材、20…点火プラグ、21…ウオータジャッケット、22…フランジ部、23…シリンダヘッドの固定座面、24…燃料噴射弁廻りの隔壁、25…点火プラグ廻りの隔壁、26…ウオータジャケットの底部、27…シール廻りの隔壁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for attaching a fuel injection valve to a cylinder head in an in-cylinder direct injection engine.
[0002]
[Prior art]
In the direct injection engine, the fuel injection valve is attached to the cylinder head so as to directly face the combustion chamber. FIG. 2 is a cross-sectional view of a conventional fuel injection valve mounting portion structure, in which 001 is a cylinder head, 002 is a combustion chamber, 003 is a fuel injection valve mounting hole formed in the cylinder head, 004 is a fuel injection valve mounted in the mounting hole, 005 is a tip portion of the fuel injection valve, 006 is a large diameter portion adjacent to the tip portion, and 007 is a part of the fuel injection valve mounting hole. 008 is a seat surface adjacent to the tip portion accommodation hole, and 009 is an end surface sealing member interposed between the end surface of the large diameter portion 006 and the seat surface 008. Is a nozzle hole provided at the tip. The figure shows a cross section of the nozzle hole.
[0003]
This structure is an end face seal structure in which the end face of the large diameter portion 006 adjacent to the tip end portion 005 of the fuel injection valve 004 is pressed against the seat surface 008 via the seal member 009, and the seal member 009 is easily deformed. However, since the seal position is at the back of the combustion chamber 002, the entire tip portion 005 of the entire length H1 is exposed to high-temperature combustion gas, the tip portion 005 becomes hot, and carbon is formed around the nozzle hole 010. Adheres and is easy to deposit.
[0004]
In order to reduce the carbon adhesion, the main body flange portion of the fuel injection valve is pressed against the cylinder head, and the fuel injection valve is formed in the axial gap formed between the portion ahead of the main body flange portion and the cylinder head. There is a fuel injection valve mounting portion structure (Japanese Patent Laid-Open No. 10-252609) in which a metal gasket having a thermal conductivity equivalent to or larger than that is interposed and a water jacket is provided around the gasket.
[0005]
The heat transferred from the combustion chamber to the fuel injection valve is efficiently transferred to the cylinder head through a metal gasket with high thermal conductivity, and the water jacket is provided around the fuel injection valve body and the metal gasket. Thus, the area around the seal position of the fuel injection valve can be cooled, but the surface area of the tip of the fuel injection valve exposed to the high-temperature combustion gas is not reduced, and the effect of suppressing carbon adhesion at the tip is low.
[0006]
For this improvement, a shaft seal member is attached to the outer periphery of the tip of the fuel injection valve that directly faces the combustion chamber, reducing the surface area of the tip exposed to high-temperature combustion gas and lowering the temperature around the injection hole. Some have reduced the adhesion of carbon, but since the seal member is disposed closer to the combustion chamber, there was a concern about thermal deterioration of the seal member.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to prevent carbon from adhering to the injection hole of a fuel injection valve of a direct injection engine and to achieve stable fuel injection.
[0008]
[Means for solving the problems and effects]
The present invention relates to an improvement in the structure of a fuel injection valve mounting portion that solves such a problem. The invention of claim 1 is directed to a fuel injection valve mounting portion structure that is mounted on a cylinder head of an in-cylinder direct injection engine. wherein the fuel injection valve, mounted toward the combustion chamber from the fuel injection valve mounting hole formed in the cylinder head directly above the combustion chamber, the cylinder head, tip end portion of the fuel injection valve is housed to form a part accommodation hole, the tip portion of the fuel injection valve is to be exposed on the combustion chamber, disposing a sealing member between the outer periphery and the distal portion housing hole of the tip of the fuel injection valve with a water jacket so as to cover the periphery of the sealing member is provided, extending the bottom of the water jacket, as well as extended to a position closest to the combustion chamber, below the said sealing member And characterized by being formed so as to cover the periphery of the seal member.
According to a second aspect of the present invention, in the fuel injection valve mounting portion structure according to the first aspect, the water jacket is formed so as to cover the entire circumference of the seal member, and at the bottom side of the water jacket. A feature is that the spark plugs are arranged close to each other.
[0009]
Since the invention of claim 1 is configured as described above, by disposing a seal member on the outer periphery of the tip of the fuel injection valve, the surface area of the tip exposed to high-temperature combustion gas is reduced. By reducing the inflow amount of combustion gas, the temperature rise at the tip can be reduced, and carbon adhesion can be reduced.
[0010]
In addition, by forming the water jacket so as to cover the periphery of the seal member, the seal member can be actively cooled by the cooling water flowing in the water jacket, and the durability of the seal member can be improved. The temperature rise at the tip of the valve is reduced, carbon adhesion to the nozzle hole is reduced, and stable fuel injection becomes possible.
[0011]
Further, by configuring the invention as described in claim 1 , the cooling effect of the water jacket on the seal member is greatly increased by actively flowing the cooling water around the combustion chamber where the tip of the fuel injection valve is exposed. Further, it is possible to further improve the durability of the seal member and reduce carbon adhesion around the nozzle hole.
[0012]
Furthermore, by configuring the invention as described in claim 2 , the water jacket communicates with the entire circumference of the seal member, so that the cooling efficiency is improved without hindering the flow of the cooling water and is exposed to the combustion chamber. The tip of each of the fuel injection valve and spark plug to be compactly arranged adjacent to each other, and the cooling action around the tip of the combustion chamber is made to flow positively by cooling water positively. This further improves the durability of the fuel, promotes combustion, and enables stable fuel injection.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of a fuel injection valve mounting portion structure mounted on a cylinder head of an in-cylinder direct injection engine according to an embodiment of the present invention. In the figure, 1 is a cylinder head, 2 is a combustion chamber, 3 is a fuel injection valve mounting hole, 4 is a fuel injection valve, 5 is a tip portion of the fuel injection valve, and 7 is a tip portion accommodating the tip portion. A hole 20 is a spark plug attached to the cylinder head 1, and a water jacket 21 is formed in the cylinder head 1.
[0014]
The fuel injection valve 4 is attached to the combustion chamber 2 from a fuel injection valve mounting hole 3 formed in the cylinder head 1 and immediately above the combustion chamber 2, and the tip 5 of the fuel injection valve is attached to the combustion chamber 2. The fuel injection valve 4 is pressed against and fixed to the fixed seat surface 23 of the cylinder head 1 by a flange portion 22 formed integrally with the fuel injection valve 4. in the gap formed between the inner surface of the front end portion receiving hole 7, the combustion gas shaft seal by a seal member 12 which is fitted to the tip portion 5 outside circumference of the annular groove 11, the sealing member 12 is an elastic member It is formed from a fluororesin such as PTFE.
[0015]
The spark plug 20 is attached obliquely to the fuel injection valve mounting hole 3 at a position adjacent to the fuel injection valve mounting hole 3 formed in the cylinder head 1, and the tip of the spark plug 20 is placed in the combustion chamber 2. And is fixed to the cylinder head 1.
[0016]
The water jacket 21 is adjacent to the fuel injection valve 4 via a partition wall 24 formed on the entire circumference of the fuel injection valve 4, and is adjacent to the spark plug via a partition wall 25 also formed around the spark plug 20. The water jacket 21 is formed so as to cover the periphery of the fuel injection valve 4 and the spark plug 20.
[0017]
Further, the water jacket 21 is formed with a bottom portion 26 of the water jacket extending to a position closest to the combustion chamber 2, and the bottom portion 26 of the water jacket is formed from a plane AA including the lower edge of the seal member 12. The seal member 12 is formed so as to extend downward and cover the periphery of the seal member 12.
[0018]
Further, the bottom portion 26 of the water jacket is formed so as to cover the entire circumference of the seal member 12, and the thickness B of the partition wall 27 formed between the fuel injection valve 4 and the water jacket 21 is high in strength. And it is formed as thin as the heat resistance allows.
[0019]
Since the embodiment shown in FIG. 1 is configured as described above, the cylinder head 1 around the combustion chamber 2 and the tip 5 of the fuel injection valve 4, particularly the seal member 12 exposed to the combustion chamber 2, are below. The part is constantly exposed to the high temperature combustion gas during engine operation and receives heat transfer from the combustion gas, but is cooled by the cooling water flowing in the water jacket.
[0020]
In addition, since the seal member 12 that receives heat transfer from the combustion gas is formed so as to cover the periphery with a water jacket, the seal member 12 can be actively cooled.
[0021]
Thus, since the heat received by the seal member 12 is removed by heat exchange with the cooling water flowing in the water jacket 21, the temperature rise of the seal member 12 can be suppressed, the thermal deterioration of the seal member 12 is prevented, and long-term Seal performance can be maintained.
[0022]
Further, since the cooling action of the tip 5 of the fuel injection valve 4 is increased through the seal member 12, carbon adhesion at the injection hole 10 (shown in cross section in the figure) of the fuel injection valve 4 can be reduced, and a stable fuel can be obtained. Injection is possible.
[0023]
Further, although the water jacket 21 covering at least a part of the periphery of the seal member 12 can reduce carbon adhesion in the injection hole 10 of the fuel injection valve 4, the water jacket 21 covering the entire circumference of the seal member 12 can be more efficiently used. It is possible to cool, and not only the periphery of the seal member 12 at the front end portion 5 of the fuel injection valve 4 but also the substantially entire circumference of the fuel injection valve 4 inserted into the cylinder head 1 is covered. Also, it is effective for cooling the fuel injection valve 4 as a whole, the cooling action around the combustion chamber 2 is large, the durability of the seal member 12 and the spark plug 20 is improved, combustion is promoted, and stable fuel injection is possible. Become.
[0024]
In addition, since the water jacket 21 is interposed between the spark plug 20 and the fuel injection valve 4, heat transmitted from the spark plug 20 to the fuel injection valve 4 is also reduced, and the durability of the seal member 21 is further improved. Can do.
[0025]
Furthermore, the heat exchange between the combustion gas and the cooling water flowing in the water jacket 21 is further promoted by forming the partition wall 27 formed between the fuel injection valve 4 and the water jacket 21 sufficiently thin. Thus, the cooling action at the tip 5 of the fuel injection valve 4 and the seal member 12 can be further improved.
[0026]
Similarly, by forming the partition wall 24 around the fuel injection valve and the partition wall 25 around the spark plug thin, the cooling action of the fuel injection valve 4 and the spark plug 20 can be further improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a fuel injection valve mounting portion structure according to the present invention.
FIG. 2 is a cross-sectional view showing a conventional fuel injection valve mounting portion structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylinder head, 2 ... Combustion chamber, 3 ... Fuel-injection valve mounting hole, 4 ... Fuel-injection valve, 5 ... Tip part, 7 ... Tip part accommodation hole, 10 ... Injection hole, 11 ... Ring groove of outer periphery of tip part, 12 ... Sealing member, 20 ... Spark plug, 21 ... Water jacket, 22 ... Flange, 23 ... Cylinder head fixed seat surface, 24 ... Bulkhead around fuel injection valve, 25 ... Bulkhead around spark plug, 26 ... Water jacket Bottom of the wall, 27 ... partition wall around the seal

Claims (2)

筒内直噴エンジンのシリンダヘッドに装着される燃料噴射弁の取付部構造において、
前記燃料噴射弁を、燃焼室の直上で前記シリンダヘッドに形成された燃料噴射弁装着孔から前記燃焼室に向けて取り付け、
前記シリンダヘッドには、前記燃料噴射弁の先端部が収容される先端部収容孔を形成するとともに、前記燃料噴射弁の先端部が前記燃焼室内に露出するようにし、
前記燃料噴射弁の先端部の外周と前記先端部収容孔との間にシール部材を配設するとともに、前記シール部材の周囲を覆うようにウォータジャケットを設け、
前記ウォータジャケットの底部を、前記燃焼室に最も近い位置まで延設するとともに、前記シール部材よりも下方に延設し該シール部材の周囲を覆うように形成したことを特徴とする燃料噴射弁の取付部構造。In the mounting structure of the fuel injection valve attached to the cylinder head of the direct injection engine,
The fuel injection valve is attached from the fuel injection valve mounting hole formed in the cylinder head directly above the combustion chamber toward the combustion chamber,
The cylinder head, thereby forming a tip receiving hole tip of the fuel injection valve is accommodated, the tip portion of the fuel injection valve is to be exposed on the combustion chamber,
A seal member is disposed between the outer periphery of the tip portion of the fuel injection valve and the tip portion accommodation hole, and a water jacket is provided so as to cover the periphery of the seal member,
A fuel injection valve characterized in that a bottom portion of the water jacket extends to a position closest to the combustion chamber, extends below the seal member, and covers the periphery of the seal member. Mounting part structure. 前記シール部材の全周を覆うように前記ウォータジャケットを形成すると共に、前記ウォータジャケットの底部側方に点火プラグを近接して配設したことを特徴とする請求項１に記載の燃料噴射弁の取付部構造。  2. The fuel injection valve according to claim 1, wherein the water jacket is formed so as to cover the entire circumference of the seal member, and an ignition plug is disposed close to the bottom side of the water jacket. Mounting part structure.
JP2000300672A 2000-09-29 2000-09-29 Mounting structure of fuel injection valve Expired - Fee Related JP4285621B2 (en)

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WO2013191529A1 (en) * 2012-06-18 2013-12-27 Perusahaan Otomobil Nasional Sdn Bhd Method and apparatus for cooling a cylinder head
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