JP2004270492A - Fuel injection valve mounting structure of engine - Google Patents

Fuel injection valve mounting structure of engine Download PDF

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Publication number
JP2004270492A
JP2004270492A JP2003059825A JP2003059825A JP2004270492A JP 2004270492 A JP2004270492 A JP 2004270492A JP 2003059825 A JP2003059825 A JP 2003059825A JP 2003059825 A JP2003059825 A JP 2003059825A JP 2004270492 A JP2004270492 A JP 2004270492A
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Japan
Prior art keywords
injection valve
fuel injection
rotation
fuel
rotation restricting
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JP2003059825A
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Japanese (ja)
Inventor
Takeshi Kono
剛 河野
Takeshi Goto
剛 後藤
Isao Shimizu
功 清水
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Mazda Motor Corp
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Mazda Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve mounting structure of an engine capable of regulating the rotation of a fuel injection valve while suppressing a cost increase. <P>SOLUTION: The structure comprises the fuel injection valve 4 and a rotation-regulating member. The fuel injection valve 4 is mounted to a fuel injection valve-mounting hole, and a flat rotation regulating part 8b is formed at a part of the approximately cylindrical circumference of the valve. One end side of the rotation-regulating member is fixed to an engine body and the other end side is engaged with the rotation regulating part 8b for regulating rotation in the axial direction of the fuel injection valve 4. The fuel injection valve 4 is provided with a resin-made housing member 8 where a coupler connecting part 8a for coupler connecting is formed for feeding power to an electromagnetic solenoid in the fuel injection valve, and the housing member 8 and the rotation-regulating part 8b are integrally formed. Accordingly, forming the rotation-regulating part 8b at the resin-made housing member 8 where the coupler connecting part 8a is formed makes machine work for forming the rotation-regulating part unnecessary to regulate the rotation of the fuel injection valve 4 while suppressing the cost increase. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジンの燃料噴射弁取付構造に関する。
【０００２】
【従来の技術】
従来、エンジンの燃料噴射弁の取付けは種々知られており、例えば、燃焼室上流の吸気通路に燃料を噴射するタイプのエンジン（所謂、ポート噴射エンジン）では、吸気マニホールドに燃料噴射弁取付孔が形成され、その燃料噴射弁取付孔に燃料噴射弁が取付けられる。また、燃焼室内に直接燃料を噴射するタイプのエンジン（所謂、筒内噴射式エンジン）では、シリンダヘッドに燃料噴射弁取付孔が形成され、その燃料噴射弁取付孔に燃料噴射弁が取付けられる。
【０００３】
また、燃料噴射弁から噴射される燃料の噴射方向は、燃焼性に大きな影響を与えるため、その方向を予め定めた方向に位置決めすることが重要である。
例えば、上記前者の場合、吸気２ポートのコモン部から両方の吸気ポートに燃料を均等に噴射するため、ポート間の壁に燃料が付着しないよう２つの噴口を形成し、その各噴口が対応する各吸気ポートに指向するように位置決め（燃料噴射弁の回り止め）する必要がある。
また、上記後者の場合、点火プラグ付近に比較的濃い混合気を集めるため、燃料噴射弁の噴口（噴射方向）を軸線方向からみて点火プラグ方向にオフセットして形成し、その噴口が点火プラグ方向に指向するように位置決め（燃料噴射弁の回り止め）する必要がある。
例えば、下記特許文献１には、筒内噴射式エンジンにおいて、燃料噴射弁の回転を規制するストッパ部材の凸部を、シリンダヘッドに形成された凹部に係合させて燃料噴射弁の回り止めを行い、燃料噴射弁の噴口が点火プラグ周りで濃い混合気分布となる方向に位置決めすることが開示されている。
【０００４】
【特許文献１】
特開平１０−１４１１８１号公報
【発明が解決しようとする課題】
【０００５】
しかしながら、上述の先行技術によれば、シリンダヘッド側にストッパ部材と係合して燃料噴射弁の回転を規制するための凹部を機械加工する必要があり、コストが高くなるという問題がある。
【０００６】
また、別の燃料噴射弁の位置決めとして、燃料噴射弁の外周に偏平部を形成するとともに、その偏平部と係合する二股状のアーム部をエンジン本体に固定して、燃料噴射弁の回転を規制することも知られている。
しかしながら、そのような先行技術においても、燃料噴射弁に偏平部を形成するための機械加工が必要となり、コストが高くなるという問題がある。
【０００７】
ところで、燃料噴射弁には、燃料噴射弁を駆動するため内部のソレノイドに給電する給電用カプラを接続する必要があるが、その給電用カプラが接続されるカプラ接続部は、通常燃料噴射弁とは別体の樹脂製ハウジングとして形成され、その樹脂製ハウジングは燃料噴射弁をインサート部材とした射出成形法にて鋳ぐるむ等によって一体的に形成される。
そして、このような樹脂製ハウジングは、型形状を変更することによって容易にその形状を変更することができるため、機械加工等によって偏平部を形成するよりも、コスト上昇を抑制することができるものである。
【０００８】
本発明は、以上のような課題に勘案してなされたもので、その目的は、カプラ接続部が形成される樹脂製のハウジング部材に偏平部を形成することによって、偏平部形成のためのコスト上昇を抑制しつつ、燃料噴射弁の回転を規制可能なエンジンの燃料噴射弁取付構造を提供することにある。
【０００９】
【課題を解決するための手段】
前記目的を達成するため、本発明にあってはその解決手法として次のようにしてある。すなわち、本発明の第１の構成において、エンジン本体に形成される燃料噴射弁取付孔と、
該燃料噴射弁取付孔に装着され、略円筒状に形成されるとともに、略円筒状の外周の一部に偏平状の回転規制部が形成される燃料噴射弁と、
一端側が上記エンジン本体に固定されるとともに、他端側が上記燃料噴射弁の回転規制部と係合して燃料噴射弁の軸線方向の回転を規制する回転規制部材とを備えたエンジンの燃料噴射弁取付構造において、
上記燃料噴射弁には、当該燃料噴射弁内の電磁ソレノイドに給電するカプラ接続用のカプラ接続部が形成される樹脂製のハウジング部材が設けられており、
該ハウジング部材に、上記回転規制部が一体的に形成されるよう構成してある。
本発明の第１の構成によれば、カプラ接続部が形成される樹脂製のハウジング部材に回転規制部を形成するよう構成したため、エンジン本体側若しくは燃料噴射弁に回転規制部を形成するための機械加工が不要となり、コスト上昇を抑えつつ、燃料噴射弁の回転を規制することができる。
【００１０】
本発明の第２の構成において、上記回転規制部材は、締結部材を介して上記エンジン本体に固定される固定部と、該固定部から内周面が略Ｕ字状となるよう二股状に分岐して上記回転規制部と係合するアーム部とから構成されており、
上記回転規制部は、上記燃料噴射弁の外周から該外周を通る接線上において上記固定部とは反対側に向かって所定長さ延設されるよう構成してある。
通常、回転規制部材は、係合力向上のため、回転規制部のみならず燃料噴射弁の外周とも係合可能するよう略Ｕ字状に構成し、略直線上に構成される先端側を偏平状に形成される回転規制部と係合させるとともに、略反円状に形成される円弧側を燃料噴射弁の外周と係合することが行われる。
ここで、回転規制部を樹脂製のハウジング部材に形成した場合であっても、その回転規制部と係合する回転規制部材の形状、寸法にまで影響を与えることは望ましくなく、従来の回転規制部材を使用できるようにすることが望ましい。
本発明の第２の構成によれば、回転規制部は、燃料噴射弁の外周と略同幅に形成されるため、その回転規制部と係合する回転規制部材は、従来通り燃料噴射弁の外周と係合可能に設定された従来品を使用することができる。
【００１１】
本発明の第３の構成において、上記燃料噴射弁には、上記燃料噴射弁取付孔への装着時上記燃料噴射弁取付孔外周の上記エンジン本体に当接する拡径部が形成されており、
上記回転規制部は、上記燃料噴射弁を当該燃料噴射弁の軸線方向からみて上記燃料噴射弁の外周から上記拡径部の外周と略一致するまで延設されるよう構成してある。
本発明の第３の構成によれば、回転規制部は、燃料噴射弁の拡径部の外周と略一致するまで延設されるよう構成されるため、拡径部上方のデッドスペース内に回転規制部を設けることができ、回転規制部とその周辺に位置するエンジン本体や各部品との干渉を防止することができる。
【００１２】
本発明の第４の構成において、上記燃料噴射弁取付孔は、シリンダヘッドに形成され、上記燃料噴射弁から直接燃焼室内に燃料を噴射することが可能にされるとともに、
上記燃料噴射弁の噴射方向が、当該燃料噴射弁の軸線方向からみて特定方向にオフセットして設定され、上記燃焼室内に配置される点火プラグと上記燃料噴射弁から噴射される燃料とを所定の位置関係に設定するよう構成してある。
本発明の第４の構成によれば、筒内噴射式エンジンにおいて、燃料噴射方向が特定方向にオフセットして設定され、燃焼室内に配置される点火プラグと燃料噴射弁から噴射される燃料とを所定の位置関係、つまり、点火プラグ付近に比較的濃い混合気を適度に分布させることができ、良好な燃焼性を維持可能な関係にすることができる。
【００１３】
本発明の第５の構成において、上記ハウジング部材に形成される回転規制部と上記回転規制部材との係合とによって、上記燃料噴射弁の噴射方向と上記給電カプラ接続部の向きとを設定するよう構成される。
本発明の第５の構成によれば、上記ハウジング部材に形成された回転規制部と、上記回転規制部材との係合とによって、上記燃料噴射弁の噴射方向と上記給電カプラ接続部の向きとを設定されるため、燃料噴射弁の回転規制とカプラ接続部の向きの規制とを一度に行うことができ、燃料噴射弁の回転規制と、カプラ接続作業性との両立を図ることができる。
【００１４】
【発明の効果】
本発明によれば、カプラ接続部が形成される樹脂製のハウジング部材に偏平部を形成することによって、偏平部形成のためのコスト上昇を抑制しつつ、燃料噴射弁の回転を規制することができる。
【００１５】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
図１はシリンダヘッドの縦断面図、図２は燃料噴射弁取付部の横断面図（図１において、シリンダヘッド上方からみた燃料噴射弁の取付部付近を気筒配列方向に切断した横断面図で、シリンダヘッドは不図示）、図３は燃料噴射弁の側面図、図４は燃料噴射弁を後端側からみた平面図、図５は回転規制部材の平面図、図６は回転規制部材の側面図、図７は燃料噴射弁に回転規制部材が係合された状態を燃料噴射弁後端側からみた平面図である。
尚、本実施形態では、４気筒筒内噴射式ガソリンエンジンに適用した例を示す。
【００１６】
図１において、１はシリンダヘッドであって、シリンダヘッド１には、点火プラグ（不図示）が挿入される点火プラグ挿入口２、燃焼室３、吸気ポート４及び吸気ポート４下方側のシリンダヘッド１の側面と燃焼室３とを連通し、燃料噴射弁４が装着される燃料噴射弁取付孔５が形成されている。
上記燃料噴射弁４は、図１及び図２に示すように、その後端側に燃料分配管６を装着させ、先端側に形成された拡径部４ａを燃料噴射弁取付孔５の外周のシリンダヘッド１に当接させた状態で、締結ボルト１０を介してシリンダヘッド１に取付けられる。
尚、燃料分配管６は、気筒配列方向に延びて各気筒の燃料噴射弁４と接続され、各気筒の燃料噴射弁４に燃料を分配供給する、従来からよく知られたものであり、締結ボルト７を介してシリンダヘッド１に取付けられている。
また、燃料噴射弁４の噴口４ｂは、噴霧角の中心線Ｌ１（噴射方向）が燃料噴射弁４の軸線Ｌ２に対して所定角（例えば、８．５度）シリンダヘッド１上方側にオフセットして設定されており、燃焼室３内に配置される点火プラグと燃料噴射弁４から噴射される燃料とを所定の位置関係、つまり、点火プラグ付近に比較的濃い混合気を適度に分布させることができ、良好な燃焼性を維持可能な関係にされている。
そして、燃料噴射弁４は、上述の点火プラグと燃料との関係を維持するため、図２に示すように、後述する回転規制部材９が締結ボルト１０によりシリンダヘッド１に固定され、この回転規制部材９により燃料噴射弁４の回転が規制され、位置決めが行われる。以下、この位置決め構造について、説明する。
尚、図２に示すように、締結ボルト７、燃料噴射弁４、回転規制部材９及び締結ボルト１０は、気筒配列方向に併設されている。
【００１７】
まず、燃料噴射弁４の構造について、説明する。
図３に示すように、燃料噴射弁４には、樹脂製のハウジング部材８（図４中ハッチングで示す部材）が射出成形法により鋳ぐるまれ、金属製の燃料噴射弁４に一体的に設けられている。
また、このハウジング部材８には、その射出成形時に燃料噴射弁４内部の電磁ソレノイド（不図示）に給電するためのカプラ（不図示）が接続されるカプラ接続部８ａと、回転規制部材９と係合する回転規制部８ｂとが同時に形成されている。
そして、これらカプラ接続部８ａ、回転規制部８ｂが形成されるハウジング部材８は、型成形する際、各部８ａ、８ｂが形成されるよう予めその型形状が設定されているため、回転規制部８ｂを後で機械加工する必要はない。
回転規制部８ｂは、図４にも示すように、燃料噴射弁４の外周からその外周を通る接線Ｌ３、Ｌ４上において、拡径部４ａの外周と略一致するまで延設されるよう形成されている。
つまり、回転規制部８ｂは、燃料噴射弁４の外径と略同径の幅ｌａを有するとともに、拡径部の外径と略一致するまで延びる長さｌｂを有するよう構成されている。
【００１８】
次に、上記燃料噴射弁４の回転規制部８ｂと係合する回転規制部材９について、説明する。
回転規制部材９は、図５、図６に示すように、締結ボルト１０（図２において図示）によってシリンダヘッド１に固定される固定部９ａと、その固定部９ａから内周面が略Ｕ字状になるよう二股に分岐され、固定部９ａ寄りの円弧が燃料噴射弁４の外周と係合し、先端側の略直線部が上記回転規制部８ｂと係合するアーム部９ｂとから構成されている。
また、固定部９ａとアーム部９ｂとは、図６に示すように、上下方向にオフセットして配置されており、アーム部９ｂが固定部９ａよりも下側に位置されるため、図１、図２にも示すように、アーム部９ｂの下面が燃料噴射弁４の拡径部４ａ上に当接される。
【００１９】
そして、図７に示すように、回転規制部材９の固定部９ａ寄りの円弧を燃料噴射弁４の外周と係合させるとともに、先端側の略直線部を上記回転規制部８ｂと係合させることによって、燃料噴射弁４の軸線Ｌ２の回転を規制して、燃料噴射弁４の噴射方向の位置決めがなされる。
また、この係合によって全ての気筒に装着される燃料噴射弁４のカプラ接続部８ａが、鉛直方向Ｌ５に対して斜め下方側に指向するように設定される。尚、Ｌ６燃料分配管６の配列方向である。
【００２０】
以上のように、本実施形態によれば、カプラ接続部８ａが形成される樹脂製のハウジング部材８に回転規制部８ｂを形成したため、シリンダヘッド１若しくは燃料噴射弁４に回転規制部を形成するための機械加工が不要となり、コスト上昇を抑えつつ、燃料噴射弁４の回転を規制することができる。
また、回転規制部８ｂは、燃料噴射弁４の外周と略同幅に形成されるため、その回転規制部８ｂと係合する回転規制部材９は、従来通り燃料噴射弁４の外周と係合可能に設定された従来品を使用することができる。
また、回転規制部８ｂは、燃料噴射弁４の拡径部の外周と略一致するまで延設されるよう構成されるため、拡径部４ａ上方のデッドスペース内に回転規制部８ｂを設けることができ、回転規制部８ｂとその周辺に位置するシリンダヘッド１や各部品との干渉を防止することができる。
また、筒内噴射式エンジンにおいて、燃料噴射弁４の噴口４ｂは、噴霧角の中心線Ｌ１（噴射方向）が燃料噴射弁４の軸線Ｌ１に対して所定角（例えば、８．５度）シリンダヘッド１上方側にオフセットして設定されており、燃焼室３内に配置される点火プラグと燃料噴射弁４から噴射される燃料とを所定の位置関係、つまり、点火プラグ付近に比較的濃い混合気を適度に分布させることができ、良好な燃焼性を維持可能な関係にすることができる。
また、ハウジング部材８に形成された回転規制部８ｂと、回転規制部材８ｂとの係合によって、燃料噴射弁４の噴射方向とカプラ接続部８ａの向きとが設定されるため、燃料噴射弁４の回転規制とカプラ接続部８ｂの向きの規制とを一度に行うことができ、燃料噴射弁４の回転規制と、カプラ接続作業性との両立を図ることができる。
【００２１】
尚、本実施形態では、ハウジング部材８が燃料噴射弁４をインサート部材として射出成形されるものとしたが、ハウジング部材が燃料噴射弁とは別に単独で射出成形され、後に燃料噴射弁と組み合わせるものであってもよい。
また、本実施形態では、回転規制部材９として内周面が略Ｕ字状になるよう二股に分岐される形状のものを示したが、Ｙ字状等別の形状のものを用いてもよい。
また、本実施形態では、筒内噴射式エンジンに適用する例を示したが、その他、ポート噴射式エンジンに適用するようにしてもよい。
また、本実施形態では、４気筒エンジンに適用する例を示したが、気筒数が４気筒以外のエンジンや、ディーゼルエンジンにも適用可能である。
【図面の簡単な説明】
【図１】本発明の実施形態に係るシリンダヘッドの縦断面図。
【図２】本発明の実施形態に係る燃料噴射弁取付部の横断面図。
【図３】本発明の実施形態に係る燃料噴射弁の側面図。
【図４】本発明の実施形態に係る燃料噴射弁を後端側からみた平面図。
【図５】本発明の実施形態に係る回転規制部材の平面図。
【図６】本発明の実施形態に係る回転規制部材の側面図。
【図７】本発明の実施形態に係る図７は燃料噴射弁に回転規制部材が係合された状態を燃料噴射弁後端側からみた平面図。
【符号の説明】
１：シリンダヘッド
３：燃焼室
４：燃料噴射弁
４ａ：拡径部
４ｂ：噴口
５：燃料噴射弁取付孔
６：燃料分配管
７、１０：締結ボルト
８：ハウジング部材
８ａ：カプラ接続部
８ｂ：回転規制部
９：回転規制部材
９ａ：固定部
９ｂ：アーム部
Ｌ１：噴霧角の中心線（噴射方向）
Ｌ２：燃料噴射弁４の軸線
Ｌ３、Ｌ４：接線
Ｌ５：鉛直方向
Ｌ６：燃料分配管６の配列方向[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fuel injector mounting structure for an engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various types of mounting of a fuel injection valve of an engine are known. For example, in an engine of a type that injects fuel into an intake passage upstream of a combustion chamber (a so-called port injection engine), a fuel injection valve mounting hole is provided in an intake manifold. The fuel injection valve is formed and the fuel injection valve is mounted in the fuel injection valve mounting hole. Further, in an engine of a type that directly injects fuel into a combustion chamber (a so-called in-cylinder injection engine), a fuel injection valve mounting hole is formed in a cylinder head, and a fuel injection valve is mounted in the fuel injection valve mounting hole.
[0003]
In addition, since the injection direction of the fuel injected from the fuel injection valve has a great effect on the combustibility, it is important to position the direction in a predetermined direction.
For example, in the former case, in order to inject fuel evenly from the common portion of the two intake ports to both intake ports, two nozzles are formed so that fuel does not adhere to the wall between the ports, and each nozzle corresponds to the nozzle. It is necessary to position the fuel injection valve so that it points to each intake port (rotation of the fuel injection valve).
In the latter case, in order to collect a relatively rich air-fuel mixture near the spark plug, the injection port (injection direction) of the fuel injection valve is formed so as to be offset in the direction of the ignition plug when viewed from the axial direction, and the injection port is directed in the direction of the ignition plug. (The rotation of the fuel injection valve must be stopped).
For example, in Patent Document 1 below, in a direct injection engine, a protrusion of a stopper member for restricting rotation of a fuel injection valve is engaged with a recess formed in a cylinder head to prevent rotation of the fuel injection valve. It is disclosed that the injection port of the fuel injection valve is positioned in a direction in which a rich air-fuel mixture is distributed around the ignition plug.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-141181 [Problems to be Solved by the Invention]
[0005]
However, according to the prior art described above, it is necessary to machine a concave portion on the cylinder head side for engaging with the stopper member to restrict the rotation of the fuel injection valve, resulting in a problem that the cost is increased.
[0006]
Further, as another positioning of the fuel injection valve, a flat portion is formed on the outer periphery of the fuel injection valve, and a forked arm portion engaging with the flat portion is fixed to the engine main body, and rotation of the fuel injection valve is performed. It is also known to regulate.
However, even in such prior art, there is a problem that machining for forming a flat portion in the fuel injection valve is required, and the cost is increased.
[0007]
By the way, it is necessary to connect a power supply coupler for supplying power to an internal solenoid to drive the fuel injection valve to the fuel injection valve. Is formed as a separate resin housing, and the resin housing is integrally formed by casting or the like by an injection molding method using the fuel injection valve as an insert member.
In addition, since such a resin housing can easily change its shape by changing the shape of the mold, it is possible to suppress an increase in cost more than forming a flat portion by machining or the like. It is.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to form a flat portion on a resin housing member on which a coupler connecting portion is formed, thereby reducing the cost for forming the flat portion. An object of the present invention is to provide a fuel injector mounting structure for an engine capable of restricting the rotation of the fuel injector while suppressing the rise.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the following as a solution. That is, in the first configuration of the present invention, a fuel injection valve mounting hole formed in the engine body,
A fuel injection valve mounted in the fuel injection valve mounting hole, formed in a substantially cylindrical shape, and having a flat rotation restricting portion formed on a part of a substantially cylindrical outer periphery,
A fuel injection valve having an end fixed to the engine body and a rotation regulating member having the other end engaged with a rotation regulating portion of the fuel injection valve to regulate the rotation of the fuel injection valve in the axial direction. In the mounting structure,
The fuel injection valve is provided with a resin housing member in which a coupler connection portion for connecting a coupler for supplying power to an electromagnetic solenoid in the fuel injection valve is formed,
The rotation restricting portion is formed integrally with the housing member.
According to the first configuration of the present invention, since the rotation restricting portion is formed on the resin housing member on which the coupler connecting portion is formed, the rotation restricting portion is formed on the engine body side or the fuel injection valve. The need for machining is eliminated, and the rotation of the fuel injection valve can be restricted while suppressing an increase in cost.
[0010]
In the second configuration of the present invention, the rotation restricting member includes a fixing portion fixed to the engine body via a fastening member, and a bifurcated branch from the fixing portion such that an inner peripheral surface is substantially U-shaped. And the arm portion engaged with the rotation restricting portion,
The rotation restricting portion is configured to extend a predetermined length from the outer periphery of the fuel injection valve to a side opposite to the fixed portion on a tangent passing through the outer periphery.
Normally, the rotation restricting member is formed in a substantially U-shape so as to be able to engage not only with the rotation restricting portion but also with the outer periphery of the fuel injection valve in order to improve the engagement force, and the front end side formed on a substantially straight line has a flat shape. In addition to engaging with the rotation restricting portion formed in the fuel injection valve, the arc side formed in a substantially anti-circular shape is engaged with the outer periphery of the fuel injection valve.
Here, even when the rotation restricting portion is formed on a resin housing member, it is not desirable to affect the shape and dimensions of the rotation restricting member engaged with the rotation restricting portion. It is desirable to be able to use the member.
According to the second configuration of the present invention, the rotation restricting portion is formed to have substantially the same width as the outer periphery of the fuel injection valve. A conventional product set to be able to engage with the outer periphery can be used.
[0011]
In the third configuration of the present invention, the fuel injector has an enlarged diameter portion that is in contact with the engine body around an outer periphery of the fuel injector mounting hole when the fuel injector is mounted on the fuel injector mounting hole,
The rotation restricting portion is configured to extend from the outer periphery of the fuel injection valve to substantially coincide with the outer periphery of the enlarged diameter portion when the fuel injection valve is viewed from the axial direction of the fuel injection valve.
According to the third configuration of the present invention, since the rotation restricting portion is configured to be extended to substantially coincide with the outer periphery of the enlarged diameter portion of the fuel injection valve, the rotation restricting portion rotates in the dead space above the enlarged diameter portion. The restricting portion can be provided, and interference between the rotation restricting portion and the engine body or each component located around the rotation restricting portion can be prevented.
[0012]
In the fourth configuration of the present invention, the fuel injection valve mounting hole is formed in the cylinder head, so that fuel can be directly injected into the combustion chamber from the fuel injection valve,
The injection direction of the fuel injection valve is set to be offset in a specific direction as viewed from the axial direction of the fuel injection valve, and a predetermined amount of fuel is injected between the spark plug disposed in the combustion chamber and the fuel injected from the fuel injection valve. It is configured to be set in a positional relationship.
According to the fourth configuration of the present invention, in the in-cylinder injection engine, the fuel injection direction is set to be offset in a specific direction, and the ignition plug disposed in the combustion chamber and the fuel injected from the fuel injection valve are used. A predetermined positional relationship, that is, a relatively rich air-fuel mixture can be appropriately distributed in the vicinity of the ignition plug, and a relationship can be maintained in which good combustion properties can be maintained.
[0013]
In the fifth configuration of the present invention, the injection direction of the fuel injection valve and the direction of the power supply coupler connection portion are set by engagement of the rotation restriction member formed on the housing member with the rotation restriction member. It is configured as follows.
According to the fifth configuration of the present invention, the rotation direction of the fuel injection valve and the direction of the power supply coupler connection portion are adjusted by the rotation restricting portion formed on the housing member and the engagement with the rotation restricting member. Is set, the regulation of the rotation of the fuel injection valve and the regulation of the direction of the coupler connecting portion can be performed at the same time, and both the regulation of the rotation of the fuel injection valve and the operability of the coupler connection can be achieved.
[0014]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, by forming a flat part in the resin-made housing member in which a coupler connection part is formed, it can suppress rotation of a fuel injection valve, suppressing cost increase for flat part formation. it can.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a longitudinal sectional view of a cylinder head, and FIG. 2 is a transverse sectional view of a fuel injection valve mounting portion (in FIG. 1, a cross sectional view of the vicinity of the fuel injection valve mounting portion as viewed from above the cylinder head is cut in the cylinder arrangement direction. , A cylinder head is not shown), FIG. 3 is a side view of the fuel injection valve, FIG. 4 is a plan view of the fuel injection valve viewed from the rear end side, FIG. 5 is a plan view of a rotation restricting member, and FIG. FIG. 7 is a side view, and FIG. 7 is a plan view of the state in which the rotation restricting member is engaged with the fuel injection valve as viewed from the rear end side of the fuel injection valve.
In this embodiment, an example is shown in which the present invention is applied to a four-cylinder in-cylinder injection gasoline engine.
[0016]
In FIG. 1, reference numeral 1 denotes a cylinder head. The cylinder head 1 has a spark plug insertion port 2 into which a spark plug (not shown) is inserted, a combustion chamber 3, an intake port 4, and a cylinder head below the intake port 4. The fuel injection valve mounting hole 5 in which the fuel injection valve 4 is mounted is formed by communicating the side surface of the fuel cell 1 with the combustion chamber 3.
As shown in FIGS. 1 and 2, the fuel injection valve 4 has a fuel distribution pipe 6 attached to the rear end thereof, and a large-diameter portion 4 a formed at the front end thereof is connected to a cylinder on the outer periphery of the fuel injection valve mounting hole 5. It is attached to the cylinder head 1 via the fastening bolt 10 in a state where the cylinder head 1 is in contact with the head 1.
The fuel distribution pipe 6 extends in the cylinder arrangement direction, is connected to the fuel injection valve 4 of each cylinder, and distributes and supplies fuel to the fuel injection valve 4 of each cylinder. It is attached to the cylinder head 1 via bolts 7.
In addition, the injection port 4b of the fuel injection valve 4 is offset such that the center line L1 (injection direction) of the spray angle is a predetermined angle (for example, 8.5 degrees) with respect to the axis L2 of the fuel injection valve 4 above the cylinder head 1. The ignition plug disposed in the combustion chamber 3 and the fuel injected from the fuel injection valve 4 have a predetermined positional relationship, that is, a relatively rich mixture is appropriately distributed near the ignition plug. And a relationship capable of maintaining good flammability.
In order to maintain the above-described relationship between the ignition plug and the fuel, the fuel injection valve 4 has a rotation restricting member 9 described later fixed to the cylinder head 1 by a fastening bolt 10 as shown in FIG. The rotation of the fuel injection valve 4 is regulated by the member 9 and positioning is performed. Hereinafter, this positioning structure will be described.
As shown in FIG. 2, the fastening bolt 7, the fuel injection valve 4, the rotation restricting member 9, and the fastening bolt 10 are provided side by side in the cylinder arrangement direction.
[0017]
First, the structure of the fuel injection valve 4 will be described.
As shown in FIG. 3, a housing member 8 made of resin (member indicated by hatching in FIG. 4) is cast around the fuel injection valve 4 by an injection molding method, and is provided integrally with the metal fuel injection valve 4. Have been.
The housing member 8 has a coupler connecting portion 8a to which a coupler (not shown) for supplying power to an electromagnetic solenoid (not shown) inside the fuel injection valve 4 at the time of injection molding is connected. The rotation restricting portion 8b to be engaged is formed at the same time.
The housing member 8 in which the coupler connecting portion 8a and the rotation restricting portion 8b are formed is preliminarily shaped so that the respective portions 8a and 8b are formed at the time of molding. Need not be machined later.
As shown in FIG. 4, the rotation restricting portion 8b is formed so as to extend from the outer periphery of the fuel injection valve 4 to substantially coincide with the outer periphery of the enlarged diameter portion 4a on tangent lines L3 and L4 passing through the outer periphery. ing.
In other words, the rotation restricting portion 8b is configured to have a width la substantially equal to the outer diameter of the fuel injection valve 4 and a length lb extending substantially to the outer diameter of the enlarged diameter portion.
[0018]
Next, the rotation restricting member 9 that engages with the rotation restricting portion 8b of the fuel injection valve 4 will be described.
As shown in FIGS. 5 and 6, the rotation restricting member 9 has a fixing portion 9a fixed to the cylinder head 1 by a fastening bolt 10 (shown in FIG. 2), and an inner peripheral surface from the fixing portion 9a having a substantially U-shape. The fuel injection valve 4 includes an arm 9b that engages with the outer periphery of the fuel injection valve 4 and a substantially linear portion on the tip side engages with the rotation restricting portion 8b. ing.
Also, as shown in FIG. 6, the fixing portion 9a and the arm portion 9b are arranged offset in the vertical direction, and the arm portion 9b is located below the fixing portion 9a. As shown in FIG. 2, the lower surface of the arm portion 9b abuts on the enlarged diameter portion 4a of the fuel injection valve 4.
[0019]
Then, as shown in FIG. 7, the circular arc near the fixing portion 9a of the rotation restricting member 9 is engaged with the outer periphery of the fuel injection valve 4, and the substantially straight portion on the distal end side is engaged with the rotation restricting portion 8b. Thus, rotation of the axis L2 of the fuel injection valve 4 is restricted, and positioning of the fuel injection valve 4 in the injection direction is performed.
Further, by this engagement, the coupler connecting portions 8a of the fuel injection valves 4 mounted on all the cylinders are set so as to be directed obliquely downward with respect to the vertical direction L5. Note that this is the direction in which the L6 fuel distribution pipes 6 are arranged.
[0020]
As described above, according to the present embodiment, since the rotation restricting portion 8b is formed on the resin housing member 8 on which the coupler connecting portion 8a is formed, the rotation restricting portion is formed on the cylinder head 1 or the fuel injection valve 4. Therefore, the rotation of the fuel injection valve 4 can be restricted while suppressing an increase in cost.
Further, since the rotation restricting portion 8b is formed to have substantially the same width as the outer periphery of the fuel injection valve 4, the rotation restricting member 9 engaging with the rotation restricting portion 8b engages with the outer periphery of the fuel injection valve 4 as before. Conventional products that can be set can be used.
Further, since the rotation restricting portion 8b is configured to extend so as to substantially coincide with the outer periphery of the enlarged diameter portion of the fuel injection valve 4, the rotation restricting portion 8b is provided in a dead space above the enlarged diameter portion 4a. Thus, interference between the rotation restricting portion 8b and the cylinder head 1 and components located around the rotation restricting portion 8b can be prevented.
Further, in the direct injection engine, the injection port 4b of the fuel injection valve 4 is arranged such that the center line L1 (injection direction) of the spray angle is a predetermined angle (for example, 8.5 degrees) with respect to the axis L1 of the fuel injection valve 4. The ignition plug is set to be offset above the head 1, and the ignition plug disposed in the combustion chamber 3 and the fuel injected from the fuel injection valve 4 have a predetermined positional relationship, that is, a relatively dense mixture near the ignition plug. Air can be distributed appropriately, and a relationship can be maintained in which good flammability can be maintained.
Further, the engagement between the rotation restricting portion 8b formed on the housing member 8 and the rotation restricting member 8b sets the injection direction of the fuel injection valve 4 and the direction of the coupler connecting portion 8a. The rotation of the fuel injection valve 4 and the direction of the coupler connecting portion 8b can be performed at the same time, and both the restriction of the rotation of the fuel injection valve 4 and the workability of the coupler connection can be achieved.
[0021]
In this embodiment, the housing member 8 is injection-molded using the fuel injection valve 4 as an insert member. However, the housing member is injection-molded separately from the fuel injection valve, and is later combined with the fuel injection valve. It may be.
Further, in the present embodiment, the rotation regulating member 9 has a shape in which the inner peripheral surface is bifurcated so as to have a substantially U-shape, but another shape such as a Y-shape may be used. .
Further, in the present embodiment, an example in which the invention is applied to a direct injection engine is shown, but the invention may be applied to a port injection engine.
In the present embodiment, an example in which the present invention is applied to a four-cylinder engine has been described. However, the present invention is also applicable to an engine having a number of cylinders other than four or a diesel engine.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a cylinder head according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a fuel injector mounting portion according to the embodiment of the present invention.
FIG. 3 is a side view of the fuel injection valve according to the embodiment of the present invention.
FIG. 4 is a plan view of the fuel injection valve according to the embodiment of the present invention as viewed from a rear end side.
FIG. 5 is a plan view of a rotation restricting member according to the embodiment of the present invention.
FIG. 6 is a side view of the rotation restricting member according to the embodiment of the present invention.
FIG. 7 according to the embodiment of the present invention is a plan view of a state in which the rotation restricting member is engaged with the fuel injection valve as viewed from the rear end side of the fuel injection valve.
[Explanation of symbols]
1: Cylinder head 3: Combustion chamber 4: Fuel injection valve 4a: Large diameter portion 4b: Injection hole 5: Fuel injection valve mounting hole 6: Fuel distribution pipe 7, 10: Fastening bolt 8: Housing member 8a: Coupler connection section 8b: Rotation restricting part 9: Rotation restricting member 9a: Fixed part 9b: Arm part L1: Center line of spray angle (injection direction)
L2: axis L3 of fuel injection valve 4, L4: tangent L5: vertical direction L6: direction of arrangement of fuel distribution pipe 6

Claims (5)

エンジン本体に形成される燃料噴射弁取付孔と、
該燃料噴射弁取付孔に装着され、略円筒状に形成されるとともに、略円筒状の外周の一部に偏平状の回転規制部が形成される燃料噴射弁と、
一端側が上記エンジン本体に固定されるとともに、他端側が上記燃料噴射弁の回転規制部と係合して燃料噴射弁の軸線方向の回転を規制する回転規制部材とを備えたエンジンの燃料噴射弁取付構造において、
上記燃料噴射弁には、当該燃料噴射弁内の電磁ソレノイドに給電するカプラ接続用のカプラ接続部が形成される樹脂製のハウジング部材が設けられており、
該ハウジング部材に、上記回転規制部が一体的に形成されていることを特徴とするエンジンの燃料噴射弁取付構造。A fuel injection valve mounting hole formed in the engine body,
A fuel injection valve attached to the fuel injection valve mounting hole, formed in a substantially cylindrical shape, and having a flat rotation restricting portion formed on a part of a substantially cylindrical outer periphery,
A fuel injection valve having an end fixed to the engine body and a rotation regulating member having the other end engaged with a rotation regulating portion of the fuel injection valve to regulate the rotation of the fuel injection valve in the axial direction. In the mounting structure,
The fuel injection valve is provided with a resin housing member in which a coupler connection portion for coupling a coupler for supplying power to an electromagnetic solenoid in the fuel injection valve is formed,
The fuel injection valve mounting structure for an engine, wherein the rotation restricting portion is formed integrally with the housing member. 上記回転規制部材は、締結部材を介して上記エンジン本体に固定される固定部と、該固定部から内周面が略Ｕ字状となるよう二股状に分岐して上記回転規制部と係合するアーム部とから構成されており、
上記回転規制部は、上記燃料噴射弁の外周から該外周を通る接線上において上記固定部とは反対側に向かって所定長さ延設されることを特徴とする請求項１記載のエンジンの燃料噴射弁取付構造。The rotation restricting member is fixed to the engine body via a fastening member, and bifurcated from the fixed portion so that the inner peripheral surface is substantially U-shaped, and is engaged with the rotation restricting portion. And an arm part that
The engine fuel according to claim 1, wherein the rotation restricting portion extends a predetermined length from an outer periphery of the fuel injection valve to a side opposite to the fixed portion on a tangent passing through the outer periphery. Injection valve mounting structure. 上記燃料噴射弁には、上記燃料噴射弁取付孔への装着時上記燃料噴射弁取付孔外周の上記エンジン本体に当接する拡径部が形成されており、
上記回転規制部は、上記燃料噴射弁を当該燃料噴射弁の軸線方向からみて上記燃料噴射弁の外周から上記拡径部の外周と略一致するまで延設されることを特徴とする請求項２記載のエンジンの燃料噴射弁取付構造。The fuel injection valve has an enlarged diameter portion that is in contact with the engine body on the outer periphery of the fuel injection valve mounting hole when the fuel injection valve is mounted on the fuel injection valve mounting hole,
3. The fuel injection valve according to claim 2, wherein the rotation restricting portion extends from an outer periphery of the fuel injection valve to substantially coincide with an outer periphery of the enlarged diameter portion when the fuel injection valve is viewed from an axial direction of the fuel injection valve. A fuel injection valve mounting structure for an engine as described in the above. 上記燃料噴射弁取付孔は、シリンダヘッドに形成され、上記燃料噴射弁から直接燃焼室内に燃料を噴射することが可能にされるとともに、
上記燃料噴射弁の噴射方向が、当該燃料噴射弁の軸線方向からみて特定方向にオフセットして設定され、上記燃焼室内に配置される点火プラグと上記燃料噴射弁から噴射される燃料とを所定の位置関係に設定することを特徴とする請求項１乃至３のいずれか一つに記載のエンジンの燃料噴射弁取付構造。The fuel injection valve mounting hole is formed in the cylinder head, and allows fuel to be directly injected into the combustion chamber from the fuel injection valve.
The injection direction of the fuel injection valve is set to be offset in a specific direction as viewed from the axial direction of the fuel injection valve, and a predetermined amount of fuel is injected between the spark plug disposed in the combustion chamber and the fuel injected from the fuel injection valve. The fuel injector mounting structure for an engine according to any one of claims 1 to 3, wherein the positional relationship is set. 上記ハウジング部材に形成される回転規制部と上記回転規制部材との係合とによって、上記燃料噴射弁の噴射方向と上記給電カプラ接続部の向きとを設定することを特徴とする請求項１乃至４のいずれか一つに記載のエンジンの燃料噴射弁取付構造。The injection direction of the fuel injection valve and the direction of the power supply coupler connection portion are set by engagement of a rotation restriction portion formed on the housing member with the rotation restriction member. 5. The fuel injector mounting structure for an engine according to any one of 4.
JP2003059825A 2003-03-06 2003-03-06 Fuel injection valve mounting structure of engine Pending JP2004270492A (en)

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