JP4065093B2

JP4065093B2 - Mounting structure for electromagnetic fuel injection valve

Info

Publication number: JP4065093B2
Application number: JP29672399A
Authority: JP
Inventors: 邦彰高橋; 徹也上原
Original assignee: Keihin Corp
Current assignee: Astemo Ltd
Priority date: 1999-10-19
Filing date: 1999-10-19
Publication date: 2008-03-19
Anticipated expiration: 2019-10-19
Also published as: JP2001115929A

Description

【０００１】
【発明の属する技術分野】
本発明は，エンジンに設けられて，電磁式燃料噴射弁の，複数の燃料噴孔を有する先端部が挿入される燃料導入孔と，この燃料導入孔外で電磁式燃料噴射弁の外周面に形成されるフランジと，このフランジに隣接するようにエンジン外面に形成される位置決め凸部とを備え，前記フランジ及び位置決め凸部に，互いに当接して電磁式燃料噴射弁の回転を阻止するフランジ側当接面及び位置決め凸部側当接面を設けた，電磁式燃料噴射弁の取付け位置決め構造に関する。
【０００２】
【従来の技術】
かゝる電磁式燃料噴射弁の取付け位置決め構造は，例えば特開平６−２２１２５２号公報に開示されているように，既に知られている。かゝる構造によりエンジンに取付けられた電磁式燃料噴射弁は，所定位置で回転を阻止されるので，複数の燃料噴孔の位置が確定して，それぞれ所定の方向へ燃料を噴射することができる。
【０００３】
【発明が解決しようとする課題】
ところで，かゝる電磁式燃料噴射弁の取付け位置決め構造において，電磁式燃料噴射弁の位置決めを正確に行うためには，前記フランジ側及び位置決め凸部側の相対向する当接面間の間隙を極力小さくする必要があるが，そのようにすると，電磁式燃料噴射弁のエンジンへの取付け時，フランジ及び位置決め凸部が相互に干渉し易くなって，取付け性が低下するという弊害を招く。
【０００４】
本発明は，かゝる事情に鑑みてなされたもので，電磁式燃料噴射弁の位置決め精度を高めるべく，前記フランジ及び位置決め凸部の両当接面間隙を小さくしても，取付け性を良好にすることができるようにした，前記電磁式燃料噴射弁の取付け位置決め構造を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために，本発明は，エンジンに設けられて，電磁式燃料噴射弁の，複数の燃料噴孔を有する先端部が挿入される燃料導入孔と，前記燃料導入孔外で前記電磁式燃料噴射弁の外周面に形成されるフランジと，前記フランジに隣接するように前記エンジン外面に形成される位置決め凸部とを備え，前記フランジ及び前記位置決め凸部に，互いに当接して前記電磁式燃料噴射弁の回転を阻止するフランジ側当接面及び位置決め凸部側当接面を設けた，電磁式燃料噴射弁の取付け位置決め構造において，前記位置決め凸部に，前記位置決め凸部側当接面の上縁に達するように下る誘導斜面を形成したことを第１の特徴とする。
【０００６】
この第１の特徴によれば，電磁式燃料噴射弁をエンジンに取付けるべく，電磁式燃料噴射弁の先端部をエンジンの燃料導入孔に挿入するとき，フランジ側当接面と位置決め凸部側当接面との位置が多少ずれていても，フランジ側当接面は，電磁式燃料噴射弁の燃料導入孔への挿入に伴い，位置決め凸部の誘導斜面に誘導されて，位置決め凸部側当接面と正確に並ぶようになり，位置決め凸部側当接面との対向位置へと移行することができる。したがって，電磁式燃料噴射弁の位置決め精度を高めるべく，フランジ側当接面及び位置決め側当接面間の間隙を小さくしても，電磁式燃料噴射弁のエンジンへの取付けを容易に行うことができるので，電磁式燃料噴射弁の位置決め精度と取付け性の両方を満足させることができる。特に位置決め精度の向上により，電磁式燃料噴射弁の複数の燃料噴孔から所望箇所に噴射できて，燃焼室での混合気Ａ／Ｆの安定化と燃費の低減に寄与し得る。
【０００７】
また本発明は，上記特徴において，前記位置決め凸部の高さを前記フランジの厚さより大きく設定すると共に，前記フランジ側当接面及び前記位置決め凸部側当接面の高さを略等しくしたことを第２の特徴とする。
【０００８】
この第２の特徴によれば，位置決め凸部側当接面及び誘導斜面の高さを充分に得て，誘導斜面の，フランジ側当接面に対する良好な誘導機能と，フランジ側当接面及び位置決め凸部側当接面の高い位置決め強度とを確保することができる。
【０００９】
【発明の実施の形態】
本発明の実施の形態を，添付図面に示す本発明の実施例に基づいて以下に説明する。
【００１０】
図１は本発明の電磁式燃料噴射弁の取付け位置決め構造が適用されるエンジンの横断平面図，図２は図１の２−２線断面図，図３は図２の３−３線拡大縦断面図，図４は図３の４矢視図，図５は図３の５−５線断面図である。
【００１１】
先ず，図１及び図２において，多気筒エンジン１のシリンダヘッド２には，燃焼室３と，それに連なる吸気ポート４ｉ及び排気ポート４ｅとが形成される。吸気ポート４ｉは，燃焼室３に開口する出口側を一対の分岐ポート４ｉ₁ ，４ｉ₂
に分岐させ，また排気ポート４ｅは，燃焼室３に開口する入口側を一対の分岐ポート４ｅ₁ ，４ｅ₂ に分岐させている。これら分岐ポート４ｉ₁ ，４ｉ₂ 及び分岐ポート４ｅ₁ ，４ｅ₂ は各一対の吸気弁６ｉ₁ ，６ｉ₂ 及び排気弁６ｅ₁ ，６ｅ₂ により開閉される。
【００１２】
吸気ポート４ｉ及び排気ポート４ｅにそれぞれ連なる吸気マニホールド５ｉ及び排気マニホールド５ｅはシリンダヘッド２の両側面に接合される。吸気マニホールド５ｉには，各気筒に対応して一本の電磁式燃料噴射弁Ｉが本発明の取付構造により取付けられる。この電磁式燃料噴射弁Ｉは，図４に示すように，一対の分岐ポート４ｉ₁ ，４ｉ₂ に指向する一対の燃料噴孔１４₁ ，１４₂ が設けられていて，両分岐ポート４ｉ₁ ，４ｉ₂ に向けて燃料を噴射するようになっている。
【００１３】
図３に示すように，前記電磁式燃料噴射弁Ｉの弁ハウジング１０は，円筒状の弁ハウジング本体１１（磁性体）と，この弁ハウジング本体１１の前端部内周面に嵌合して溶接される有底円筒状の弁座部材１２とから構成され，弁座部材１２は，その前端面に開口する燃料出口１３と，その後縁に連なる円錐状の弁座１２ａとを有する。弁座部材１２の前端面には，上記燃料出口１３と連通する一対の前記燃料噴孔１４₁ ，１４₂ を有する鋼板製のインジェクタプレート１５が全周溶接される。
【００１４】
弁ハウジング本体１１には可動コア１６が収容され，その前端に一体に突設される弁杆１８に上記弁座１２ａに着座し得る球状の弁体１９を溶接される。
【００１５】
弁ハウジング本体１１の後端面には摺動案内筒２０が全周溶接され，この摺動案内筒２０の内周面によって可動コア１６が摺動自在に支承される。摺動案内筒２０は非磁性金属，例えばステンレス鋼製である。
【００１６】
また摺動案内筒２０の後端部内周面には，固定コア１７が嵌合して全周溶接され，この固定コア１７の前端面に対して，可動コア１６は，その後端面を対向させている。
【００１７】
弁ハウジング本体１１の後端部外周面には，段付き円筒状のコイルハウジング２１（磁性体）の小径部２１ａが嵌合して溶接される。このコイルハウジング２１には，弁ハウジング１０の後端部，摺動案内筒２０及び可動コア１６を囲繞するコイル組立体２２が収納される。コイル組立体２２は，ボビン２３と，これに巻装されるコイル２４とからなっている。コイルハウジング２１，コイル組立体２２及び固定コア１７は合成樹脂製の被覆体２５内に埋封され，この被覆体２５の前端には，前記弁ハウジング本体１１の外周から半径方向に立ち上がる段部２６と，この段部２６の外周縁から後方に向かって大径となるテーパ状のストッパ段部２７が形成される。またこの被覆体２５の中間部には，前記コイル２４に連なる接続端子２８を備えたカプラ２９が一体に連設される。
【００１８】
固定コア１７は，可動コア１６の通孔３０を介して弁ハウジング１０内と連通する中空部３１を有しており，その中空部３１に，可動コア１６を閉弁方向，即ち弁座１２ａへの着座方向に付勢するコイル状の弁ばね３２と，この弁ばね３２の後端を支承するパイプ状のリテーナ３３とが収容される。
【００１９】
固定コア１７の後端には，パイプ状のリテーナ３３を介して固定コア１７の中空部３１に連通する燃料入口３４ａを持つ入口筒３４が一体に連設され，その燃料入口３４ａに燃料フィルタ３５が装着される。
【００２０】
前記被覆体２５の段部２６から前方に露出した弁ハウジング本体１１の外周には，上記段部２６に当接する合成樹脂製のシール位置決め環３７が嵌合される。また前記弁座部材１２の前端部に合成樹脂製のキャップ３９が弾力的に嵌着され，このキャップ３９とシール位置決め環３７との間においてＯリング３８が弁座部材１２の外周に装着される。また電磁式燃料噴射弁Ｉの入口筒３４の外周にもＯリング４０が装着される。
【００２１】
キャップ３９は，前記燃料噴孔１４₁ ，１４₂ からの燃料噴射を妨げないように開口部３９ａを前面に有する。
【００２２】
一方，吸気マニホールド５ｉには，中間部にテーパ状のストッパ段部４２を有する燃料導入孔４１が設けられており，これに電磁式燃料噴射弁Ｉがキャップ３９を先頭にして挿入される。その際，電磁式燃料噴射弁ＩのＯリング３８が燃料導入孔４１の内周面に密接して燃料導入孔４１をシールし，電磁式燃料噴射弁Ｉのストッパ段部２７が，燃料導入孔４１のストッパ段部４２に当接することにより，電磁式燃料噴射弁Ｉの燃料導入孔４１への挿入限界を規定する。
【００２３】
さて，上記電磁式燃料噴射弁Ｉの一対の燃料噴孔１４₁ ，１４₂ を前記一対の分岐ポート４ｉ₁ ，４ｉ₂ に正確に指向させて，この電磁式燃料噴射弁Ｉを位置決めするための位置決め構造について，図３及び図５により説明する。
【００２４】
電磁式燃料噴射弁Ｉの被覆体２５に，その外周面から突出して吸気マニホールド５ｉの外面に対向するフランジ４３が一体に形成され，このフランジ４３の一側には，被覆体２５の外周面の一部を挟んで一平面上に並ぶ一対のフランジ側当接面４４，４４が形成される。
【００２５】
一方，吸気マニホールド５ｉの外面に，燃料導入孔４１の開口縁一側に隣接する位置決め凸部４５が一体成形され，この位置決め凸部４５には，前記両フランジ側当接面４４，４４に当接可能な一対の位置決め凸部側当接面４６，４６と，これら位置決め凸部側当接面４６の上縁に達するように下る誘導斜面４７，４７と，両位置決め凸部側当接面４６，４６間にあって燃料導入孔４１の内面に連続する円弧面４８とが形成される。
【００２６】
而して，上記フランジ４３のフランジ側当接面４４，４４及び位置決め凸部４５の位置決め凸部側当接面４６，４６は，電磁式燃料噴射弁Ｉの先端部が燃料導入孔４１に挿入されたとき，これら両当接面４４，４４；４６，４６の当接により該電磁式燃料噴射弁Ｉを，一対の燃料噴孔１４₁ ，１４₂ が前記一対の分岐ポート４ｉ₁ ，４ｉ₂ に正確に指向する所定位置に保持するように，配置される。誘導斜面４７の角度は略４５°が適当である。
【００２７】
また，位置決め凸部４５の高さｈは，フランジ４３の厚さｔより充分大きく，望ましく厚さｔの略２倍に設定されると共に，相対向するフランジ側当接面４４及び位置決め凸部側当接面４６の高さは略等しく設定される。
【００２８】
再び図２及び図３において，上記のように燃料導入孔４１に先端部を挿入された電磁式燃料噴射弁Ｉの入口筒３４の外周には，燃料分配管５１の供給口５２が前記Ｏリング４０を介して嵌合される。その際，燃料分配管５１と被覆体２５の後端面との間に，被覆体２５のストッパ段部２７を燃料導入孔４１のストッパ段部４２との当接状態に押圧する弾性部材５５が介裝される。燃料分配管５１は，一側に取付ボス５６を備えており，これがインシュレータカラー５７を挟んで吸気マニホールド５外面に突設される支持ボス５８にボルト５９により固着される。こうして，電磁式燃料噴射弁Ｉは吸気マニホールド５ｉに取付けられる。
【００２９】
次に，この実施例の作用について説明する。
【００３０】
電磁式燃料噴射弁Ｉをエンジン１に取付けるべく，電磁式燃料噴射弁Ｉの先端部をエンジン１の燃料導入孔４１に挿入するとき，フランジ４３のフランジ側当接面４４，４４が位置決め凸部４５の位置決め凸部側当接面４６，４６に対して多少位置ずれしていても，フランジ４３のフランジ側当接面４４，４４は，電磁式燃料噴射弁Ｉの燃料導入孔４１への挿入に伴い，先ず位置決め凸部４５の誘導斜面４７に当たり，この誘導斜面４７により位置決め凸部４５の位置決め凸部側当接面４６，４６と正確に並ぶ位置まで誘導され，そして位置決め凸部４５の位置決め凸部側当接面４６との当接位置へと移行する。したがって，電磁式燃料噴射弁Ｉの位置決め精度を高めるべく，フランジ側当接面４４及び位置決め側当接面４６間の間隙を小さく設定しても，電磁式燃料噴射弁Ｉの吸気マニホールド５ｉへの取付けを容易に行うことができる。
【００３１】
また，位置決め凸部４５の高さｈを前記フランジ４３の厚さｔより充分に大きく設定すると共に，相対向するフランジ側当接面４４及び位置決め凸部側当接面４６の高さを略等しく設定したので，位置決め凸部４５の誘導斜面４７を充分広く確保して，該誘導斜面４７の，フランジ側当接面４４に対する誘導機能を充分に発揮させることができ，また相対向するフランジ側当接面４４及び位置決め凸部側当接面４６に高い位置決め強度を与えることができる。
【００３２】
また，位置決め凸部４５には，燃料導入孔４１の内周面に連続する円弧面４８を形成したので，その円弧面４８も燃料導入孔４１の内周面と共に電磁式燃料噴射弁Ｉの外周面を支持することになり，その支持強度を高めることができる。
【００３３】
エンジン１の運転中，コイル２４を消磁した状態では，弁ばね３２の付勢力で可動コア１６及び弁体１９が前方に押圧され，弁体１９を弁座１２ａに着座させている。したがって，燃料フィルタ３５及び入口筒３４を通して弁ハウジング１内に供給された高圧燃料は，弁ハウジング１内に保持される。
【００３４】
エンジン１の吸気行程時，コイル２４を通電により励磁すると，それにより生ずる磁束が固定コア１７，可動コア１６，弁ハウジング１０及びコイルハウジング２１を順次走り，磁力により可動コア１６が弁体１９を伴って固定コア１７に吸引され，弁座１２ａが開放されるので，弁ハウジング１０内の高圧燃料が燃料出口１３を出て，一対の燃料噴孔１４₁ ，１４₂ から二方向へ噴射される。
【００３５】
このとき，電磁式燃料噴射弁Ｉは，前述のように，フランジ側当接面４４及び位置決め凸部側当接面４６の当接により所定位置に保持されていて，一対の燃料噴孔１４₁ ，１４₂ を一対の分岐ポート４ｉ₁ ，４ｉ₂ の下流端へ正確に指向させているので，両燃料噴孔１４₁ ，１４₂からの噴射燃料は，図１に示すように，対応する分岐ポート４ｉ₁ ，４ｉ₂ の下流端に正確に向かい，吸入空気と共にエンジン１の燃焼室３に吸入される。したがって，上記噴射燃料のポート間壁への付着を極力回避して，燃料室内での混合気Ａ／Ｆを安定させると共に，燃費の低減に寄与することができる。
【００３６】
本発明は上記実施例に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば，フランジ側当接面４４及び位置決め凸部側当接面４６は，それぞれ一つであってもよい。また上記実施例のように一対設ける場合には，各一対の当接面４４，４４；４６，４６は，それぞれ互いに角度をなすように配置することもできる。しかし，上記実施例のように，各一対の当接面４４，４４；４６，４６をそれぞれ同一平面上に配置する方が成形上，有利である。
【００３７】
【発明の効果】
以上のように本発明の第１の特徴によれば，エンジンに設けられて，電磁式燃料噴射弁の，複数の燃料噴孔を有する先端部が挿入される燃料導入孔と，前記燃料導入孔外で前記電磁式燃料噴射弁の外周面に形成されるフランジと，前記フランジに隣接するように前記エンジン外面に形成される位置決め凸部とを備え，前記フランジ及び前記位置決め凸部に，互いに当接して前記電磁式燃料噴射弁の回転を阻止するフランジ側当接面及び位置決め凸部側当接面を設けた，電磁式燃料噴射弁の取付け位置決め構造において，前記位置決め凸部に，前記位置決め凸部側当接面の上縁に達するように下る誘導斜面を形成したので，電磁式燃料噴射弁の位置決め精度を高めるべく，フランジ側当接面及び位置決め側当接面間の間隙を小さくしても，誘導斜面の誘導作用によりフランジ側当接面及び位置決め側当接面の当接配置を容易に行うことができ，位置決め精度と取付け性の両方を満足させることができ，特に位置決め精度の向上により，電磁式燃料噴射弁の複数の燃料噴孔から所望箇所に噴射できて，燃焼室での混合気Ａ／Ｆの安定化と燃費の低減を図ることができる。
【００３８】
また本発明の第２の特徴によれば，前記位置決め凸部の高さを前記フランジの厚さより大きく設定すると共に，前記フランジ側当接面及び前記位置決め凸部側当接面の高さを略等しくしたので，位置決め凸部側当接面及び誘導斜面の高さを充分に得て，誘導斜面の，フランジ側当接面に対する良好な誘導機能と，フランジ側当接面及び位置決め凸部側当接面の高い位置決め強度とを確保することができる。
【図面の簡単な説明】
【図１】本発明の電磁式燃料噴射弁の取付け位置決め構造が適用されるエンジンの横断平面図。
【図２】図１の２−２線断面図。
【図３】図２の３−３線拡大縦断面図。
【図４】図３の４矢視図。
【図５】図３の５−５線断面図。
【符号の説明】
１・・・・・エンジン
１４₁ ，１４₂ ・・・燃料噴孔
４１・・・・燃料導入孔
４３・・・・フランジ
４４・・・・フランジ側の当接面
４５・・・・位置決め凸部
４６・・・・位置決め凸部側の当接面
４７・・・・誘導斜面
Ｉ・・・・・電磁式燃料噴射弁
ｈ・・・・・位置決め凸部の高さ
ｔ・・・・・フランジの厚さ[0001]
BACKGROUND OF THE INVENTION
The present invention provides a fuel introduction hole provided in an engine, into which an end portion having a plurality of fuel injection holes of an electromagnetic fuel injection valve is inserted, and an outer peripheral surface of the electromagnetic fuel injection valve outside the fuel introduction hole. a flange is formed, and a positioning convexity which is formed in the engine outer surface so as to be adjacent to the flange, the flange and the positioning protrusion, flange side to prevent rotation of the electromagnetic fuel injection valve in contact with each other The present invention relates to an electromagnetic fuel injection valve mounting and positioning structure provided with a contact surface and a positioning convex portion side contact surface .
[0002]
[Prior art]
Such an electromagnetic fuel injection valve mounting and positioning structure is already known as disclosed in, for example, Japanese Patent Laid-Open No. 6-221252. Since the electromagnetic fuel injection valve attached to the engine with such a structure is prevented from rotating at a predetermined position, the positions of a plurality of fuel injection holes can be determined and fuel can be injected in a predetermined direction. it can.
[0003]
[Problems to be solved by the invention]
By the way, in such an electromagnetic fuel injection valve mounting positioning structure, in order to accurately position the electromagnetic fuel injection valve, a gap between the contact surfaces facing each other on the flange side and the positioning convex side is provided. Although it is necessary to make it as small as possible, doing so makes it difficult for the flange and the positioning projection to interfere with each other when the electromagnetic fuel injection valve is attached to the engine, resulting in a detrimental effect that the attachment is reduced.
[0004]
The present invention has been made in view of such circumstances. In order to improve the positioning accuracy of the electromagnetic fuel injection valve, the mounting property is good even if the clearance between both the contact surfaces of the flange and the positioning projection is reduced. An object of the present invention is to provide a mounting positioning structure for the electromagnetic fuel injection valve.
[0005]
[Means for Solving the Problems]
To achieve the above object, the present invention is provided in the engine, the electromagnetic fuel injection valve, a fuel introduction hole for tip is inserted having a plurality of fuel injection holes, the in the fuel introduction hole out comprising a flange formed on the outer peripheral surface of the electromagnetic fuel injection valve, and a positioning protrusion formed on the engine outer surface adjacent to the flange, the flange and the positioning protrusion, the contact with each other It provided a flange-side contact surface and the positioning protrusion side abutment surface prevents rotation of the electromagnetic fuel injection valve, in the mounting positioning structure of an electromagnetic fuel injection valve, to the positioning protrusion, the positioning protrusion side those A first feature is that a guiding slope is formed so as to reach the upper edge of the contact surface.
[0006]
According to the first feature, in order to mount the electromagnetic fuel injection valve in the engine, when inserting the distal portion of the electromagnetic fuel injection valve in the fuel introduction hole of the engine, the flange side abutment surface positioning protrusion side even if the position is slightly deviated in the contact surface, the flange side those facing surface is due to the insertion of the fuel introduction hole of the electromagnetic fuel injection valve, it is guided to the guiding slant positioning protrusion, positioning protrusion side become aligned exactly with the abutment surface, it can be shifted to a position facing the positioning projection side abutment surface. Therefore, to increase the positioning accuracy of the electromagnetic fuel injection valve, even if small gap between the flanges side contacting surface and the positioning side abutment surface, is possible to mount to the engine of the electromagnetic fuel injection valve easily because can Ru, it is possible to satisfy both the positioning accuracy and mounting of the electromagnetic fuel injection valve. In particular, by improving the positioning accuracy, injection can be made to a desired location from a plurality of fuel injection holes of the electromagnetic fuel injection valve, which can contribute to stabilization of the air-fuel mixture A / F in the combustion chamber and reduction of fuel consumption.
[0007]
The present invention, in the above-mentioned characteristics, that the height of the positioning projection with set greater than the thickness of said flange, and substantially equal to the flange-side contact surface and the height of the positioning projection side abutment surface Is the second feature.
[0008]
According to the second feature, the height of the positioning convex side contact surface and the guide slope is sufficiently obtained, the guide slope has a good guide function with respect to the flange side contact surface, and the flange side contact surface and A high positioning strength of the positioning convex part side contact surface can be ensured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.
[0010]
1 is a cross-sectional plan view of an engine to which an electromagnetic fuel injection valve mounting positioning structure of the present invention is applied, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is an enlarged vertical section taken along line 3-3 of FIG. 4 is a sectional view taken along arrow 4 in FIG. 3, and FIG. 5 is a sectional view taken along line 5-5 in FIG.
[0011]
First, in FIGS. 1 and 2, the cylinder head 2 of the multi-cylinder engine 1 is formed with a combustion chamber 3, and an intake port 4i and an exhaust port 4e connected thereto. The intake port 4i has a pair of branch ports 4i ₁ , 4i ₂ on the outlet side opened to the combustion chamber 3.
The exhaust port 4e branches the inlet side opening to the combustion chamber 3 into a pair of branch ports 4e ₁ and 4e ₂ . The branch ports 4i ₁ and 4i ₂ and the branch ports 4e ₁ and 4e ₂ are opened and closed by a pair of intake valves 6i ₁ and 6i ₂ and exhaust valves 6e ₁ and 6e ₂ .
[0012]
The intake manifold 5i and the exhaust manifold 5e that are connected to the intake port 4i and the exhaust port 4e, respectively, are joined to both side surfaces of the cylinder head 2. An electromagnetic fuel injection valve I corresponding to each cylinder is attached to the intake manifold 5i by the mounting structure of the present invention. As shown in FIG. 4, the electromagnetic fuel injection valve I is provided with a pair of fuel injection holes 14 ₁ and 14 ₂ directed to a pair of branch ports 4 i ₁ and 4 i ₂ , and both branch ports 4 i ₁ , The fuel is injected toward 4i ₂ .
[0013]
As shown in FIG. 3, the valve housing 10 of the electromagnetic fuel injection valve I is fitted and welded to a cylindrical valve housing body 11 (magnetic body) and the inner peripheral surface of the front end portion of the valve housing body 11. The valve seat member 12 includes a fuel outlet 13 that opens at a front end surface thereof, and a conical valve seat 12a that is continuous with a rear edge thereof. A steel plate injector plate 15 having a pair of fuel injection holes 14 ₁ , 14 ₂ communicating with the fuel outlet 13 is welded to the front end surface of the valve seat member 12 all around.
[0014]
A movable core 16 is accommodated in the valve housing body 11, and a spherical valve body 19 that can be seated on the valve seat 12a is welded to a valve rod 18 that projects integrally from the front end thereof.
[0015]
A sliding guide tube 20 is welded to the rear end surface of the valve housing body 11 all around, and the movable core 16 is slidably supported by the inner peripheral surface of the sliding guide tube 20. The sliding guide cylinder 20 is made of a nonmagnetic metal, such as stainless steel.
[0016]
Further, the fixed core 17 is fitted and welded to the inner peripheral surface of the rear end portion of the sliding guide tube 20, and the movable core 16 is opposed to the front end surface of the fixed core 17 with the rear end surface thereof facing. Yes.
[0017]
A small diameter portion 21a of a stepped cylindrical coil housing 21 (magnetic body) is fitted and welded to the outer peripheral surface of the rear end portion of the valve housing body 11. The coil housing 21 houses a coil assembly 22 that surrounds the rear end of the valve housing 10, the sliding guide cylinder 20, and the movable core 16. The coil assembly 22 includes a bobbin 23 and a coil 24 wound around the bobbin 23. The coil housing 21, the coil assembly 22, and the fixed core 17 are embedded in a cover 25 made of synthetic resin, and a step portion 26 that rises in the radial direction from the outer periphery of the valve housing body 11 at the front end of the cover 25. Then, a tapered stopper step portion 27 having a large diameter from the outer peripheral edge of the step portion 26 toward the rear is formed. In addition, a coupler 29 having a connection terminal 28 connected to the coil 24 is integrally connected to an intermediate portion of the covering 25.
[0018]
The fixed core 17 has a hollow portion 31 communicating with the inside of the valve housing 10 through the through hole 30 of the movable core 16, and the movable core 16 is closed to the valve seat 12 a in the hollow portion 31. A coil-shaped valve spring 32 that is urged in the seating direction and a pipe-shaped retainer 33 that supports the rear end of the valve spring 32 are accommodated.
[0019]
An inlet cylinder 34 having a fuel inlet 34a communicating with the hollow portion 31 of the fixed core 17 through a pipe-shaped retainer 33 is integrally connected to the rear end of the fixed core 17 and a fuel filter 35 is connected to the fuel inlet 34a. Is installed.
[0020]
On the outer periphery of the valve housing body 11 exposed forward from the step portion 26 of the covering body 25, a synthetic resin seal positioning ring 37 that is in contact with the step portion 26 is fitted. A synthetic resin cap 39 is elastically fitted to the front end of the valve seat member 12, and an O-ring 38 is mounted on the outer periphery of the valve seat member 12 between the cap 39 and the seal positioning ring 37. . An O-ring 40 is also mounted on the outer periphery of the inlet cylinder 34 of the electromagnetic fuel injection valve I.
[0021]
The cap 39 has an opening 39a on the front surface so as not to prevent fuel injection from the fuel injection holes 14 ₁ and 14 ₂ .
[0022]
On the other hand, the intake manifold 5i is provided with a fuel introduction hole 41 having a tapered stopper step portion 42 in the intermediate portion, into which the electromagnetic fuel injection valve I is inserted with the cap 39 at the head. At that time, the O-ring 38 of the electromagnetic fuel injection valve I is in close contact with the inner peripheral surface of the fuel introduction hole 41 to seal the fuel introduction hole 41, and the stopper step portion 27 of the electromagnetic fuel injection valve I is connected to the fuel introduction hole 41. By abutting the stopper step 42 of 41, the insertion limit of the electromagnetic fuel injection valve I into the fuel introduction hole 41 is defined.
[0023]
Now, for positioning the electromagnetic fuel injection valve I, the pair of fuel injection holes 14 ₁ and 14 ₂ of the electromagnetic fuel injection valve I are accurately directed to the pair of branch ports 4i ₁ and 4i ₂ . The positioning structure will be described with reference to FIGS.
[0024]
A flange 43 that protrudes from the outer peripheral surface of the electromagnetic fuel injection valve I and faces the outer surface of the intake manifold 5i is formed integrally with the outer surface of the cover 25 on one side of the flange 43. A pair of flange-side contact surfaces 44, 44 are formed on a single plane with a portion interposed therebetween.
[0025]
On the other hand, a positioning convex portion 45 adjacent to one side of the opening edge of the fuel introduction hole 41 is integrally formed on the outer surface of the intake manifold 5i. The positioning convex portion 45 contacts the flange-side contact surfaces 44, 44. and contact possible pair of positioning protrusions side abutment surface 46, a guiding slant 47 and 47 down to reach the upper edge of the positioning convexity side abutment surface 46, both positioning convex portion side abutment surface 46 , 46 and a circular arc surface 48 that is continuous with the inner surface of the fuel introduction hole 41 is formed.
[0026]
Thus, the flange-side contact surfaces 44, 44 of the flange 43 and the positioning-projection- side contact surfaces 46, 46 of the positioning projection 45 are inserted into the fuel introduction hole 41 at the tip of the electromagnetic fuel injection valve I. When these two contact surfaces 44, 44; 46 , 46 are brought into contact with each other, the electromagnetic fuel injection valve I is brought into contact with the pair of fuel injection holes 14 ₁ , 14 ₂ in the pair of branch ports 4i ₁ , 4i _2. It is arranged so that it is held at a predetermined position that is accurately oriented to the position. A suitable angle of the guide slope 47 is approximately 45 °.
[0027]
Further, the height h of the positioning convex portion 45 is sufficiently larger than the thickness t of the flange 43, and is preferably set to approximately twice the thickness t, and the flange-side contact surface 44 and the positioning convex portion side facing each other. The height of the contact surface 46 is set to be approximately equal.
[0028]
2 and 3 again, the supply port 52 of the fuel distribution pipe 51 is connected to the O-ring on the outer periphery of the inlet cylinder 34 of the electromagnetic fuel injection valve I whose tip is inserted into the fuel introduction hole 41 as described above. 40 is fitted. At that time, an elastic member 55 is interposed between the fuel distribution pipe 51 and the rear end surface of the covering body 25 to press the stopper step portion 27 of the covering body 25 into contact with the stopper step portion 42 of the fuel introduction hole 41. To be deceived. The fuel distribution pipe 51 is provided with a mounting boss 56 on one side, which is fixed to a support boss 58 projecting from the outer surface of the intake manifold 5 with a bolt 59 sandwiching an insulator collar 57 therebetween. Thus, the electromagnetic fuel injection valve I is attached to the intake manifold 5i.
[0029]
Next, the operation of this embodiment will be described.
[0030]
When the tip of the electromagnetic fuel injection valve I is inserted into the fuel introduction hole 41 of the engine 1 in order to attach the electromagnetic fuel injection valve I to the engine 1, the flange-side contact surfaces 44, 44 of the flange 43 are positioned as convex portions. The flange-side contact surfaces 44, 44 of the flange 43 are inserted into the fuel introduction hole 41 of the electromagnetic fuel injection valve I even if they are slightly displaced from the positioning convex portion-side contact surfaces 46, 46. As a result, the first contact with the guide slope 47 of the positioning convex portion 45 is guided to the position where the guide convex slope 47 is accurately aligned with the positioning convex portion side contact surfaces 46, 46, and the positioning convex portion 45 is positioned. It shifts to a contact position with the convex part side contact surface 46. Therefore, to increase the positioning accuracy of the electromagnetic fuel injection valve I, be set small gap between the flange-side abutment surface 44 and the positioning side abutment surface 46, to the intake manifold 5i of the electromagnetic fuel injection valve I Installation can be performed easily.
[0031]
Further, the height h of the positioning convex portion 45 is set sufficiently larger than the thickness t of the flange 43, and the heights of the opposing flange side contact surface 44 and positioning convex portion side contact surface 46 are substantially equal. since the set, and sufficiently wide ensure guiding slant 47 of the positioning protrusion 45, of the guiding slant 47, it is possible to sufficiently exhibit the guiding function for the flange side abutment surface 44, also the flange side which faces High positioning strength can be given to the contact surface 44 and the positioning convex part side contact surface 46.
[0032]
Further, since the positioning convex portion 45 is formed with an arc surface 48 continuous with the inner peripheral surface of the fuel introduction hole 41, the arc surface 48 also forms the outer periphery of the electromagnetic fuel injection valve I together with the inner peripheral surface of the fuel introduction hole 41. The surface is supported, and the support strength can be increased.
[0033]
During operation of the engine 1, when the coil 24 is demagnetized, the movable core 16 and the valve body 19 are pressed forward by the urging force of the valve spring 32, and the valve body 19 is seated on the valve seat 12 a. Therefore, the high-pressure fuel supplied into the valve housing 1 through the fuel filter 35 and the inlet cylinder 34 is held in the valve housing 1.
[0034]
When the coil 24 is energized during the intake stroke of the engine 1, the magnetic flux generated by the coil 24 sequentially travels through the fixed core 17, the movable core 16, the valve housing 10 and the coil housing 21, and the movable core 16 accompanies the valve element 19 by magnetic force. Since the valve seat 12a is opened by being sucked by the fixed core 17, the high-pressure fuel in the valve housing 10 exits the fuel outlet 13 and is injected in two directions from the pair of fuel injection holes 14 ₁ and 14 ₂ .
[0035]
At this time, the electromagnetic fuel injection valve I is held at a predetermined position by the contact of the flange-side contact surface 44 and the positioning convex portion-side contact surface 46 as described above, and the pair of fuel injection holes 14 _1. , 14 ₂ are accurately directed to the downstream ends of the pair of branch ports 4i ₁ , 4i ₂ , so that the fuel injected from both fuel injection holes 14 ₁ , 14 ₂ corresponds to the corresponding branch as shown in FIG. Directly toward the downstream end of the ports 4i ₁ and 4i ₂ , it is sucked into the combustion chamber 3 of the engine 1 together with the intake air. Therefore, it is possible to avoid adhesion of the injected fuel to the wall between the ports as much as possible, stabilize the air-fuel mixture A / F in the fuel chamber, and contribute to reduction of fuel consumption.
[0036]
The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the flange side contact surface 44 and the positioning convex part side contact surface 46 may each be one. Further, when a pair is provided as in the above embodiment, each of the pair of contact surfaces 44, 44; 46, 46 can be arranged at an angle to each other. However, as in the above embodiment, it is advantageous in terms of molding to arrange each pair of contact surfaces 44, 44; 46, 46 on the same plane.
[0037]
【The invention's effect】
According to a first aspect of the present invention as described above, provided in the engine, the electromagnetic fuel injection valve, a fuel introduction hole for tip is inserted having a plurality of fuel injection holes, the fuel introduction hole comprising a flange outside is formed on the outer circumferential surface of the electromagnetic fuel injection valve, and a positioning protrusion formed on the engine outer surface adjacent to the flange, the flange and the positioning convexity, those mutually contact with providing the flange side contacting surface and the positioning protrusion side abutment surface prevents rotation of the electromagnetic fuel injection valve, in the mounting positioning structure of an electromagnetic fuel injection valve, to the positioning protrusion, the positioning protrusion since the formation of the guiding slant descend so on reaching the edge of the part side contacting surface, to increase the positioning accuracy of the electromagnetic fuel injection valve, to reduce the gap between the flange-side contact surface and the positioning side abutment surface Even induction The contact arrangement of the flange-side contact surface and the positioning side abutment surface can be easily performed by induction effect of the surface, it is possible to satisfy both the positioning accuracy and the mounting property, in particular the improvement of positioning accuracy, the electromagnetic The fuel can be injected from a plurality of fuel injection holes of the fuel injection valve to a desired location, so that the mixture A / F in the combustion chamber can be stabilized and the fuel consumption can be reduced.
[0038]
According to a second aspect of the present invention, with the height of the positioning projection is greater than the thickness of the flange, substantially the flange side abutment surface and the positioning protrusion side contact surface of the height Therefore, the height of the positioning convex side abutment surface and the guide slope is sufficiently obtained, and the guiding slope has a good guidance function with respect to the flange side abutment surface, and the flange side abutment surface and the positioning convex part abutment. High positioning strength of the contact surface can be ensured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional plan view of an engine to which an electromagnetic fuel injection valve mounting positioning structure of the present invention is applied.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
3 is an enlarged vertical sectional view taken along line 3-3 in FIG. 2;
4 is a view taken in the direction of arrow 4 in FIG. 3;
5 is a cross-sectional view taken along line 5-5 of FIG.
[Explanation of symbols]
1 ..... engine 14 _1, 14 ₂ ... fuel injection holes 41 ... fuel introduction hole 43 ... flange 44 ... flange side of the contact surface 45 ... positioning projection Part 46 ··· Contacting surface 47 on the positioning convex side ··· Guide slope I ··· Electromagnetic fuel injection valve ··· Height t of positioning convex portion ··· Flange thickness

Claims

Provided in the engine (1), an electromagnetic fuel injection valve (I), a fuel introduction hole tip having a plurality of fuel injection holes (14 _1, 14 ₂₎ is inserted (41), said fuel introduction hole (41) and the flange (43) to outside is formed on the outer peripheral surface of the electromagnetic fuel injection valve (I), said engine (1) positioning protrusion formed on an outer surface adjacent to the flange (43) and a part (45), said flange (43) and the positioning convex portion (45), the flange-side abutment surface (44) and preventing rotation of said electromagnetic fuel injection valve (I) in contact with each other In the mounting positioning structure of the electromagnetic fuel injection valve provided with the positioning convex side contact surface ( 46),
Positioning of the electromagnetic fuel injection valve, wherein the positioning convex portion (45) is formed with a guide slope (47) that descends so as to reach the upper edge of the positioning convex portion side contact surface (46). Construction.

The electromagnetic fuel injection valve mounting and positioning structure according to claim 1,
Together with the positioning protrusion (45) of height (h) is greater than the thickness (t) of the flange (43), the flange-side abutment surface (44) and the positioning convex portion side abutment surface ( (4 ) A structure for mounting and positioning an electromagnetic fuel injection valve, characterized in that the height of 6) is substantially equal.