JP3777259B2 - Electromagnetic fuel injection valve - Google Patents

Electromagnetic fuel injection valve Download PDF

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Publication number
JP3777259B2
JP3777259B2 JP27008598A JP27008598A JP3777259B2 JP 3777259 B2 JP3777259 B2 JP 3777259B2 JP 27008598 A JP27008598 A JP 27008598A JP 27008598 A JP27008598 A JP 27008598A JP 3777259 B2 JP3777259 B2 JP 3777259B2
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Prior art keywords
valve seat
valve
fuel injection
hole
fuel
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JP2000097129A (en
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敏広 田原
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Keihin Corp
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Keihin Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、内燃機関に装着される電磁式燃料噴射弁に関し、特に、弁座及びこの弁座の中心部に連なる弁座孔を一端部に有する弁ハウジングと、この弁ハウジングに摺動可能に収容されて弁座に対向する弁体と、この弁体を弁座に向かう閉弁方向へ付勢する弁ばねと、弁ハウジングの他端に設けられて励起時に弁体を開弁させるコイルと、弁ハウジングの一端面に接合され、弁座孔に連通する複数の燃料噴孔を有するインジェクタプレートとを備え、弁座孔及び燃料噴孔間に、それらを相互に連通する偏平な燃料拡散室を設けたものゝ改良に関する。
【０００２】
【従来の技術】
かゝる電磁式燃料噴射弁は、例えば実開平２−７３６２号公報に開示されていいるように、既に知られている。
【０００３】
【発明が解決しようとする課題】
上記構造の電磁式燃料噴射弁は、弁体の開弁時、弁座を通過した高圧の燃料を弁座孔から高速で拡散室に噴射して拡散させ、それにより燃料噴孔からの燃料噴霧方向及び噴霧角度を安定させようとするものである。
【０００４】
しかしながら、上記のものでは、弁座孔が燃料噴孔より小径に形成されているので、弁体の開弁時、高圧の燃料が弁座孔から拡散室に移行したときの圧力降下が大きく、このため、その燃料が燃料噴孔から噴射されたとき、霧化効果が低下する、という弊害を伴う。 本発明は、かゝる事情に鑑みてなされたもので、拡散室での燃料の拡散を良好にして燃料噴射時の噴霧角度を安定させつゝ、燃料の圧力降下を抑えて、燃料噴射時の霧化を良好にさせ得る、前記電磁式燃料噴射弁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、弁座及びこの弁座の中心部に連なる弁座孔を一端部に有する弁座部材を一体に結合した弁ハウジングと、この弁ハウジングに摺動可能に収容されて前記弁座に対向する弁体と、この弁体を前記弁座に向かう閉弁方向へ付勢する弁ばねと、前記弁座部材の他端側で前記弁ハウジングに設けられて励起時に前記弁体を開弁させるコイルと、前記弁座部材の一端面に接合されて、前記弁座孔に連通する複数の燃料噴孔が穿設された平板状のインジェクタプレートとを備えた電磁式燃料噴射弁において、前記弁座孔と弁座との間で前記弁座部材に、該弁座孔と同軸で該弁座のテーパ角度より大なるテーパ角度の円錐状底面を有する第１の凹部を該弁座より凹ませて形成すると共に、前記円錐状底面の仮想頂点を前記弁座孔内に配置し、前記第１の凹部と前記弁体の先端面とで、前記弁座を通過した高圧燃料を前記円錐状底面に衝突させて拡散させる予備拡散室を画成し、前記弁座部材の一端面に、前記弁座孔と同軸の第２の凹部を形成すると共に、この第２の凹部を取り囲む環状溶接部により前記インジェクタプレートの上面を前記一端面に直接結合し、前記第２の凹部と前記インジェクタプレートの上面とにより、前記弁座孔及び前記燃料噴孔間を連通する偏平な燃料拡散室を設けたことを第１の特徴とする。 この第１の特徴によれば、弁座を通過した高圧燃料は、テーパ角度が弁座より大きい、予備拡散室の底面に衝突して拡散し、更に弁座孔から拡散室に移行して再び拡散する。このように高圧燃料の拡散が二段階に行われるから、高い拡散効果が得られ、燃料が各燃料噴孔から噴射されたときの噴霧方向及び噴霧角度を、各燃料噴孔の方向及び形状に応じた適正なものとすることができる。また予備拡散室の円錐状底面の仮想頂点を、弁座孔内に配置したことによる予備拡散室の更なる偏平化により、燃料の拡散効果を更に高めることができる。
【０００６】
また本発明は、上記特徴に加えて、前記弁座孔の横断面積を前記複数の燃料噴孔の総合横断面積と同等、若しくはそれより大きく設定し、開弁状態の前記弁体の先端から前記インジェクタプレートの上面までの距離を前記弁座孔の内径より小さく設定したことを第２の特徴とする。
【０００７】
この第２の特徴によれば、予備拡散室及び拡散室の偏平化により、デッドボリュームを極力削減すると共に、燃料の拡散効果を高めることができる。しかも、弁座孔の横断面積は、複数の燃料噴孔の総合横断面積と同等、若しくはそれより大きく設定されるので、燃料が弁座から拡散室に到達するまでに、燃料圧力に大きな降下は起こらず、その拡散室の燃料は、高圧を維持して各燃料噴孔から噴射されることになり、良好な霧化状態を確保することができる。
【０００８】
さらに本発明は、第１又は第２の特徴に加えて、前記複数の燃料噴孔を、前記弁座孔の軸線を中心とするピッチ円上に配置すると共に、そのピッチ円の直径を前記弁座孔の内径より大きく設定したことを第３の特徴とする。
【０００９】
この第３の特徴によれば、弁座孔から燃料噴孔への素通りを抑制して、拡散室の燃料に対する拡散機能を的確なものとすることができる。
【００１０】
【発明の実施の形態】
本発明の実施形態を、添付図面に示す本発明の一実施例に基づいて以下に説明する。
【００１１】
図１は本発明の電磁式燃料噴射弁を装着した内燃機関の要部縦断面図、図２は上記電磁式燃料噴射弁の縦断面図、図３は図２の要部拡大図、図４は図３の４部拡大図、図５は図４の５矢視図、図６は弁体の開弁状態を示す、図５との対応図である。
【００１２】
先ず図１において、本発明の電磁式燃料噴射弁Ｉは、内燃機関Ｅのシリンダヘッド３０の一側面に接合される吸気マニホールド３１に装着され、その燃料噴孔部をシリンダヘッド３１の吸気ポート３１ａ出口に指向させている。
【００１３】
図２〜図４に示すように、電磁式燃料噴射弁Ｉは、前端部内周面に弁座部材２を圧入して一体に結合した円筒状の弁ハウジング１と、この弁ハウジング１の後端部外周面に嵌合して溶接される小径部３ａを有する段付き円筒状のコイルハウジング３とを備えており、これらは何れも磁性材で構成される。
【００１４】
弁座部材２も円筒状をなしていて、その前端壁内面には円錐状の弁座２ａが形成されている。この弁座２ａに着座し得る球状の弁部４ａと、この弁部４ａに前端が溶接により結合される弁杆４ｂで弁体４が構成され、この弁体４は弁ハウジング１に収容される。弁杆４ｂの後端には、弁ハウジング１の後端部内周面に軸方向移動自在に嵌合する可動コア５が固着される。また、この可動コア５の外周面は、弁ハウジング１の後端面に全周溶接される摺動案内筒６の内周面により摺動自在に嵌合される。この摺動案内筒６の後端には、可動コア５の後端面に前端面を対向して配置される固定コア７の前端部が溶接される。その際、固定コア７の前端面と可動コア５の後端面との間に、弁体４の開閉ストロークに対応する間隙が設けられる。したがって、可動コア５の後端面が固定コア７の前端面に当接することにより、弁体４の開弁限界が規定される。
【００１５】
摺動案内筒６及び固定コア７の外周には、それらを囲繞すると共に、前記コイルハウジング３に収容されるコイル組立体８が配設される。このコイル組立体８は、摺動案内筒６及び固定コア７の外周面に嵌合するボビン９と、このボビン９に巻装されるコイル１０とからなっている。
【００１６】
中空の固定コア７の後端には、狭窄部１１を介して燃料導入筒１２が一体に連設され、この燃料導入筒１２上端の入口に燃料フィルタ１４が装着される。この燃料導入筒１２に、図示しない燃料ポンプの吐出ポートに連なる高圧燃料導管が接続されるようになっている。
【００１７】
狭窄部１１には、燃料導入筒１２内を固定コア７の中空部７ａに連通する連通管１５が嵌挿固定され、また可動コア５には、固定コア７の中空部７ａを弁ハウジング１内に連通する切欠き状の通路５ａが形成される。この可動コア５と連通管１５との間には、可動コア５を介して弁体４を弁座２ａとの着座方向、即ち閉弁方向へ付勢する弁ばね１３が縮設される。
【００１８】
弁座部材２の前端壁には、これを軸方向に貫通する、弁座２ａと同軸の弁座孔２ｂと、この弁座孔２ｂ及び弁座２ａ間を結ぶ第１の凹部２ｃとが形成される。この第１の凹部２ｃは、弁部４ａの先端面と協働して予備拡散室１６を画成する。
【００１９】
弁ハウジング１及び弁座部材２の前端面に鋼板製のインジェクタプレート１７が内外二条の環状溶接部２０，２１により直接結合される。このインジェクタプレート１７には、円錐状弁座２ａの軸線を中心とするピッチ円２２上に配置される一対二組の燃料噴孔１７1 ，１７1 ；１７1 ，１７2 が穿設されており、前記弁座孔２ｂをこれら燃料噴孔１７1 ，１７1 ；１７1 ，１７2 に連通する単一の拡散室２３が弁座部材２及びインジェクタプレート１７間に設けられる。図示例では、その拡散室２３は、弁座部材２の前端面に形成される第２の凹部２ｄと、インジェクタプレート１７の上面とで画成される。
【００２０】
以上において、図４〜図６に示すように、予備拡散室１６の底面１６ａは、円錐状弁座２ａのテーパ角度θ1 より大きいテーパ角度θ2 を持つ円錐状に形成される。さらに予備拡散室１６の円錐状底面１６ａは、その仮想頂点Ｐが弁座孔２ｂ内に配置されるように形成される（図４参照）。
【００２１】
また弁座孔２ｂは、その横断面積Ｓ1 が複数の燃料噴孔１７1 ，１７1 ；１７1 ，１７2 の総合横断面積Ｓ2 と同等、若しくはそれより大きくなるように形成される（図５参照）。その際、開弁状態の弁体４の先端から拡散室２３の底面２３ａ、即ちインジェクタプレート１７の上面までの距離Ｈは、弁座孔２ｂの内径Ｄ1 より小さく設定される（図６参照）。
【００２２】
またピッチ円２２は、弁座孔２ｂの内径Ｄ1 より大きい直径Ｄ2 が与えられる。
【００２３】
弁ハウジング１には、インジェクタプレート１７の外周部を覆うキャップ２４が装着される。
【００２４】
コイルハウジング３及び、その後端から露出した燃料導入筒１２は、合成樹脂製の絶縁被覆体２５に埋封され、この絶縁被覆体２５には、コイル１０に接続した接続端子２６を内蔵するカプラ２７が一体に形成される。
【００２５】
次に、この実施例の作用について説明する。
【００２６】
コイル１０を消磁した状態では、弁ばね１３の付勢力で可動コア５及び弁体４が前方に押圧され、弁部４ａを弁座２ａに着座させている。したがって、図示しない燃料ポンプから燃料フィルタ１４を通して燃料導入筒１２内に供給された高圧燃料は、固定コア７及び弁ハウジング１内に保持される。
【００２７】
コイル１０に通電すると、それにより生ずる磁束が固定コア７、可動コア５、弁ハウジング１及びコイルハウジング３を順次走り、これに伴い発生した磁力により可動コア５が弁体４を伴って固定コア７に吸着され、弁座２ａが開放されるので、弁ハウジング１内に待機していた高圧燃料が弁座２ａを通過し、予備拡散室１６を経て、弁座孔２ｂから拡散室２３に移り、そして複数の燃料噴孔１７1 ，１７1 ；１７1 ，１７2 から、内燃機関Ｅの対応する吸入ポート３０ａに向けて噴射される。
【００２８】
ところで、弁座２ａ及び弁座孔２ｂ間には、予備拡散室１６が設けられ、その円錐状の底面１６ａのテーパ角度θ2 は、円錐状の弁座２ａのテーパ角度θ1 より大きく設定されるので、弁座２ａから予備拡散室１６に入った燃料は、その底面１６ａに衝突して効果的に拡散する。次いで、その燃料は、弁座孔２ｂから拡散室２３に移行して再び拡散するので、その燃料が各燃料噴孔１７1 ，１７1 ；１７1 ，１７2 から噴射されたときの噴霧方向及び噴霧角度は、各燃料噴孔１７1 ，１７1 ；１７1 ，１７2 の方向及び形状に応じた適正なものとなる。しかも、弁座孔２ｂの横断面積Ｓ1 は、複数の燃料噴孔１７1 ，１７1 ；１７1 ，１７2 の総合横断面積Ｓ2 と同等、若しくはそれより大きく設定されるので、燃料が弁座２ａから拡散室２３に到達するまでに、燃料圧力に大きな降下は起こらず、したがって、その拡散室２３の燃料は、高圧をもって各燃料噴孔１７1 ，１７1 ；１７1 ，１７2 から噴射されることになり、良好な霧化状態を確保することができ、内燃機関Ｅの燃料室における燃焼の高効率化に寄与し得る。
【００２９】
また開弁状態の弁体４の先端から拡散室２３の底面２３ａまでの距離Ｈが弁座孔２ｂの内径Ｄ1 より小さく設定されるので、予備拡散室１６及び拡散室２３の偏平化により、デッドボリュームを極力削減すると共に、燃料の拡散効果を高めることができる。
【００３０】
さらに予備拡散室１６の円錐状底面１６ａの仮想頂点Ｐが、弁座孔２ｂ内に配置されるようにしたので、予備拡散室１６の更なる偏平化により、燃料の拡散効果を更に高めることができる。
【００３１】
またインジェクタプレート１７の複数の燃料噴孔１７1 ，１７1 ；１７1 ，１７2 は、弁座孔２ｂの軸線を中心とするピッチ円上に配置されると共に、そのピッチ円の直径Ｄ2 が弁座孔２ｂの内径Ｄ1 より大きく設定されるので、弁座孔２ｂから燃料噴孔１７1 ，１７1 ；１７1 ，１７2 への素通りを抑制して、拡散室２３の燃料に対する拡散機能を的確なものとすることができる。
【００３２】
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変更が可能である。
【００３３】
【発明の効果】
以上のように本発明の第１の特徴によれば、弁座及びこの弁座の中心部に連なる弁座孔を一端部に有する弁座部材を一体に結合した弁ハウジングと、この弁ハウジングに摺動可能に収容されて前記弁座に対向する弁体と、弁座部材の一端面に接合されて複数の燃料噴孔が穿設された平板状のインジェクタプレートとを備えた電磁式燃料噴射弁において、弁座孔と弁座との間で弁座部材に、該弁座孔と同軸で該弁座のテーパ角度より大なるテーパ角度の円錐状底面を有する第１の凹部を該弁座より凹ませて形成し、この第１の凹部と弁体の先端面とで、弁座を通過した高圧燃料を円錐状底面に衝突させて拡散させる予備拡散室を画成し、弁座部材の一端面に、弁座孔と同軸の第２の凹部を形成すると共に、この第２の凹部を取り囲む環状溶接部によりインジェクタプレートの上面を前記一端面に直接結合し、第２の凹部とインジェクタプレートの上面とにより、弁座孔及び燃料噴孔間を連通する偏平な燃料拡散室を設けたので、弁座を通過した高圧燃料を、予備拡散室及び拡散室において二段階にわたり拡散させることができ、各燃料噴孔から噴射される燃料の噴霧方向及び噴霧角度の安定化を図ることができる。また予備拡散室の円錐状底面の仮想頂点を、弁座孔内に配置したことによる予備拡散室の更なる偏平化により、燃料の拡散効果を更に高めることができる。
【００３４】
また本発明の第２の特徴によれば、開弁状態の弁体の先端から拡散室の底面までの距離を弁座孔の内径より小さく設定したので、予備拡散室及び拡散室の偏平化により、デッドボリュームの削減と、燃料の拡散効果の向上とに寄与し得る。しかも、弁座孔の横断面積は、複数の燃料噴孔の総合横断面積と同等、若しくはそれより大きく設定されるので、燃料が弁座から拡散室に到達するまでに、燃料圧力に大きな降下は起こらず、その拡散室の燃料は、高圧を維持して各燃料噴孔から噴射されることになり、良好な霧化状態を確保することができる。
【００３５】
さらに本発明の第３の特徴によれば、インジェクタプレートの複数の燃料噴孔を、弁座孔の軸線を中心とするピッチ円上に配置すると共に、そのピッチ円の直径を弁座孔の内径より大きく設定したので、弁座孔から燃料噴孔への素通りを抑制して、拡散室の燃料に対する拡散機能を的確なものとすることができる。
【図面の簡単な説明】
【図１】 本発明の電磁式燃料噴射弁を装着した内燃機関の要部縦断面図。
【図２】 上記電磁式燃料噴射弁の縦断面図。
【図３】 図２の要部拡大図。
【図４】 図３の４部拡大図。
【図５】 図４の５矢視図。
【図６】 弁体の開弁状態を示す、図５との対応図。
【符号の説明】
Ｄ1 ・・・弁座孔の内径
Ｄ2 ・・・ピッチ円の直径
Ｉ・・・・電磁式燃料噴射弁
Ｈ・・・・距離
Ｓ1 ・・・弁座孔の横断面積
Ｓ2 ・・・複数の燃料噴孔の総合横断面積
θ1 ・・・弁座のテーパー角度
θ2 ・・・予備拡散室底面のテーパー角度
１・・・・弁ハウジング
２ａ・・・弁座
２ｂ・・・弁座孔
２ｃ・・・第１の凹部
２ｄ・・・第２の凹部
４・・・・弁体
５・・・・可動コア
７・・・・固定コア
１０・・・コイル
１３・・・弁ばね
１７・・・インジェクタプレート
１６・・・予備拡散室
１６ａ・・予備拡散室の底面
１７・・・インジェクタプレート
１７1 ，１2 ・・・燃料噴孔
２２・・・ピッチ円
２３・・・拡散室
２３ａ・・拡散室の底面（インジェクタプレートの上面） [0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic fuel injection valve mounted on an internal combustion engine, and in particular, a valve housing having a valve seat and a valve seat hole connected to the central portion of the valve seat at one end, and slidable on the valve housing. A valve body that is accommodated and faces the valve seat; a valve spring that urges the valve body toward the valve seat toward the valve seat; and a coil that is provided at the other end of the valve housing and opens the valve body when excited. A flat fuel diffusion chamber which is joined to one end face of the valve housing and has a plurality of fuel injection holes communicating with the valve seat hole, and which communicates with each other between the valve seat hole and the fuel injection hole It is related to the improvement of ゝ
[0002]
[Prior art]
Such an electromagnetic fuel injection valve is already known as disclosed in, for example, Japanese Utility Model Publication No. 2-7362.
[0003]
[Problems to be solved by the invention]
In the electromagnetic fuel injection valve having the above structure, when the valve body is opened, the high-pressure fuel that has passed through the valve seat is injected from the valve seat hole into the diffusion chamber at a high speed to be diffused, thereby fuel spray from the fuel injection hole. It is intended to stabilize the direction and spray angle.
[0004]
However, in the above, since the valve seat hole is formed with a smaller diameter than the fuel injection hole, when the valve body is opened, the pressure drop when high-pressure fuel moves from the valve seat hole to the diffusion chamber is large, For this reason, when the fuel is injected from the fuel injection hole, there is an adverse effect that the atomization effect is lowered. The present invention has been made in view of such circumstances, and has made it possible to stabilize the spray angle at the time of fuel injection by improving the diffusion of fuel in the diffusion chamber, while suppressing the pressure drop of the fuel, and at the time of fuel injection. An object of the present invention is to provide an electromagnetic fuel injection valve that can improve the atomization of the fuel.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a valve housing in which a valve seat and a valve seat member having a valve seat hole connected to the center of the valve seat at one end are integrally coupled, and is slidable on the valve housing. facing the valve body to the valve seat are accommodated in a valve spring biasing the valve closing direction toward the valve body to the valve seat, provided on the valve housing at the other end of the valve seat member a coil for opening the valve upon excitation, is joined to one end surface of the valve seat member, a plurality of fuel injection holes in communication with the valve seat hole is a drilled plate-shaped injector plate the electromagnetic fuel injection valve, a has the in valve seat member, a conical bottom surface of the large-made taper angle than the taper angle of said valve seat in said valve seat hole coaxially between the valve seat hole and the valve seat 1 the recess and forming by recessing from the valve seat of the virtual apex of the conical bottom surface Place the serial valve seat bore, with the front end surface of the valve body and the first recess defines a preliminary diffusion chamber for diffusing by colliding the high pressure fuel that has passed through the valve seat into the conical bottom And forming a second recess coaxial with the valve seat hole on one end surface of the valve seat member, and directly connecting the upper surface of the injector plate to the one end surface by an annular weld that surrounds the second recess. The first feature is that a flat fuel diffusion chamber that communicates between the valve seat hole and the fuel injection hole is provided by the second recess and the upper surface of the injector plate . According to this first feature, the high-pressure fuel that has passed through the valve seat collides with the bottom surface of the pre-diffusion chamber having a taper angle larger than that of the valve seat, diffuses, and further transitions from the valve seat hole to the diffusion chamber. Spread. Since the high-pressure fuel is diffused in two stages in this way, a high diffusion effect is obtained, and the spray direction and spray angle when the fuel is injected from each fuel nozzle hole are changed to the direction and shape of each fuel nozzle hole. It is possible to make it appropriate. Further, the fuel diffusion effect can be further enhanced by further flattening the preliminary diffusion chamber by arranging the virtual vertex of the conical bottom surface of the preliminary diffusion chamber in the valve seat hole.
[0006]
The present invention, in addition to the above features, equivalent to total cross-sectional area of the plurality of fuel injection holes sectional area of the valve seat hole, or set it greater than the from the tip of the valve body in the valve opening state the distance to the upper surface of the injector plate and the second, characterized in that set smaller than the inner diameter of the valve seat hole.
[0007]
According to the second feature, the dead volume can be reduced as much as possible by flattening the preliminary diffusion chamber and the diffusion chamber, and the fuel diffusion effect can be enhanced. Moreover, since the cross sectional area of the valve seat hole is set to be equal to or larger than the total cross sectional area of the plurality of fuel injection holes, there is no significant drop in fuel pressure before the fuel reaches the diffusion chamber from the valve seat. The fuel in the diffusion chamber does not occur and is injected from each fuel injection hole while maintaining a high pressure, and a good atomization state can be ensured.
[0008]
The present invention, in addition to the first or second feature, a plurality of fuel injection holes, as well as arranged on a pitch circle about the axis of the valve seat hole, the valve diameter of the pitch circle The third feature is that the inner diameter of the seat hole is set larger than the inner diameter.
[0009]
According to the third feature, the passage from the valve seat hole to the fuel injection hole can be suppressed, and the diffusion function for the fuel in the diffusion chamber can be made accurate.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0011]
1 is a longitudinal sectional view of an essential part of an internal combustion engine equipped with an electromagnetic fuel injection valve of the present invention, FIG. 2 is a longitudinal sectional view of the electromagnetic fuel injection valve, FIG. 3 is an enlarged view of the essential part of FIG. 4 is an enlarged view of part 4 in FIG. 3, FIG. 5 is a view taken in the direction of the arrow 5 in FIG. 4, and FIG. 6 is a view corresponding to FIG.
[0012]
First, in FIG. 1, the electromagnetic fuel injection valve I of the present invention is attached to an intake manifold 31 joined to one side surface of a cylinder head 30 of an internal combustion engine E, and its fuel injection hole portion is connected to an intake port 31 a of the cylinder head 31. It is aimed at the exit.
[0013]
As shown in FIGS. 2 to 4, the electromagnetic fuel injection valve I includes a cylindrical valve housing 1 in which a valve seat member 2 is press-fitted into an inner peripheral surface of a front end portion and integrally joined, and a rear end of the valve housing 1. And a stepped cylindrical coil housing 3 having a small-diameter portion 3a to be fitted and welded to the outer peripheral surface of the portion, both of which are made of a magnetic material.
[0014]
The valve seat member 2 also has a cylindrical shape, and a conical valve seat 2a is formed on the inner surface of the front end wall. A valve body 4 is configured by a spherical valve portion 4a that can be seated on the valve seat 2a and a valve rod 4b whose front end is coupled to the valve portion 4a by welding. The valve body 4 is accommodated in the valve housing 1. . At the rear end of the valve rod 4b, a movable core 5 is fixedly fitted to the inner peripheral surface of the rear end portion of the valve housing 1 so as to be axially movable. Further, the outer peripheral surface of the movable core 5 is slidably fitted to the inner peripheral surface of the sliding guide tube 6 that is welded to the rear end surface of the valve housing 1 all around. The rear end of the sliding guide tube 6 is welded to the front end of a fixed core 7 that is disposed so that the front end face faces the rear end face of the movable core 5. At that time, a gap corresponding to the opening / closing stroke of the valve body 4 is provided between the front end face of the fixed core 7 and the rear end face of the movable core 5. Therefore, when the rear end surface of the movable core 5 abuts against the front end surface of the fixed core 7, the valve opening limit of the valve body 4 is defined.
[0015]
A coil assembly 8 that surrounds them and is accommodated in the coil housing 3 is disposed on the outer periphery of the sliding guide cylinder 6 and the fixed core 7. The coil assembly 8 includes a bobbin 9 fitted to the outer peripheral surfaces of the sliding guide cylinder 6 and the fixed core 7, and a coil 10 wound around the bobbin 9.
[0016]
A fuel introduction cylinder 12 is integrally connected to the rear end of the hollow fixed core 7 via a narrowed portion 11, and a fuel filter 14 is attached to the upper inlet of the fuel introduction cylinder 12. A high pressure fuel conduit connected to a discharge port of a fuel pump (not shown) is connected to the fuel introduction cylinder 12.
[0017]
In the narrowed portion 11, a communication pipe 15 that communicates the inside of the fuel introduction cylinder 12 with the hollow portion 7 a of the fixed core 7 is fitted and fixed. The movable core 5 has the hollow portion 7 a of the fixed core 7 in the valve housing 1. A notch-shaped passage 5a communicating with is formed. Between the movable core 5 and the communication pipe 15, a valve spring 13 that urges the valve body 4 in the seating direction with the valve seat 2 a, that is, the valve closing direction via the movable core 5 is contracted.
[0018]
A valve seat hole 2b coaxial with the valve seat 2a and a first recess 2c connecting the valve seat hole 2b and the valve seat 2a are formed in the front end wall of the valve seat member 2 in the axial direction. Is done. The first recess 2c defines the preliminary diffusion chamber 16 in cooperation with the tip surface of the valve portion 4a.
[0019]
A steel plate injector plate 17 is directly coupled to the front end surfaces of the valve housing 1 and the valve seat member 2 by two inner and outer annular welded portions 20 and 21. The injector plate 17 has a pair of fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2 arranged on a pitch circle 22 centered on the axis of the conical valve seat 2a. A single diffusion chamber 23 is provided between the valve seat member 2 and the injector plate 17 so that the valve seat hole 2b communicates with the fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2 . In the illustrated example, the diffusion chamber 23 is defined by the second recess 2 d formed on the front end surface of the valve seat member 2 and the upper surface of the injector plate 17.
[0020]
In the above, as shown in FIGS. 4 to 6, the bottom surface 16a of the preliminary diffusion chamber 16 is formed in a conical shape having a taper angle θ 2 that is larger than the taper angle θ 1 of the conical valve seat 2a. Further, the conical bottom surface 16a of the preliminary diffusion chamber 16 is formed such that the virtual vertex P is disposed in the valve seat hole 2b (see FIG. 4).
[0021]
Further, the valve seat hole 2b is formed so that its cross-sectional area S 1 is equal to or larger than the total cross-sectional area S 2 of the plurality of fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2 (see FIG. 5). At that time, the distance H from the distal end of the valve body 4 of the valve opening state to the upper surface of the bottom surface 23a, i.e., injector plate 17 of the diffusion chamber 23 is set smaller than the inner diameter D 1 of the valve seat hole 2b (see FIG. 6) .
[0022]
The pitch circle 22 is given a diameter D 2 that is larger than the inner diameter D 1 of the valve seat hole 2b.
[0023]
A cap 24 that covers the outer periphery of the injector plate 17 is attached to the valve housing 1.
[0024]
The coil housing 3 and the fuel introduction cylinder 12 exposed from the rear end thereof are embedded in an insulating coating 25 made of synthetic resin, and a coupler 27 having a built-in connection terminal 26 connected to the coil 10 is embedded in the insulating coating 25. Are integrally formed.
[0025]
Next, the operation of this embodiment will be described.
[0026]
In a state where the coil 10 is demagnetized, the movable core 5 and the valve body 4 are pressed forward by the urging force of the valve spring 13, and the valve portion 4a is seated on the valve seat 2a. Therefore, the high-pressure fuel supplied from the fuel pump (not shown) through the fuel filter 14 into the fuel introduction cylinder 12 is held in the fixed core 7 and the valve housing 1.
[0027]
When the coil 10 is energized, the magnetic flux generated thereby sequentially travels through the fixed core 7, the movable core 5, the valve housing 1, and the coil housing 3, and the movable core 5 accompanies the valve body 4 due to the magnetic force generated thereby. Since the valve seat 2a is opened, the high-pressure fuel waiting in the valve housing 1 passes through the valve seat 2a, passes through the preliminary diffusion chamber 16, and moves from the valve seat hole 2b to the diffusion chamber 23. The fuel is injected from the plurality of fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2 toward the corresponding intake port 30a of the internal combustion engine E.
[0028]
By the way, a preliminary diffusion chamber 16 is provided between the valve seat 2a and the valve seat hole 2b, and the taper angle θ 2 of the conical bottom surface 16a is set larger than the taper angle θ 1 of the conical valve seat 2a. Therefore, the fuel that has entered the preliminary diffusion chamber 16 from the valve seat 2a collides with the bottom surface 16a and effectively diffuses. Then, the fuel moves from the valve seat hole 2b to the diffusion chamber 23 and diffuses again, so that the fuel spray direction when the fuel is injected from the fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2 and The spray angle is appropriate depending on the direction and shape of each fuel nozzle 17 1 , 17 1 ; 17 1 , 17 2 . In addition, the cross-sectional area S 1 of the valve seat hole 2b is set equal to or larger than the total cross-sectional area S 2 of the plurality of fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2. A large drop in fuel pressure does not occur before reaching the diffusion chamber 23 from the seat 2a. Therefore, the fuel in the diffusion chamber 23 is injected from each fuel injection hole 17 1 , 17 1 ; 17 1 , 17 2 at a high pressure. As a result, a good atomization state can be ensured, and this can contribute to higher combustion efficiency in the fuel chamber of the internal combustion engine E.
[0029]
Since the distance H from the distal end of the valve body 4 of the valve opening state to the bottom surface 23a of the diffusion chamber 23 is set smaller than the inner diameter D 1 of the valve seat hole 2b, the flattening of the preliminary diffusion chamber 16 and the diffusion chamber 23, The dead volume can be reduced as much as possible, and the fuel diffusion effect can be enhanced.
[0030]
Furthermore, since the virtual vertex P of the conical bottom surface 16a of the preliminary diffusion chamber 16 is arranged in the valve seat hole 2b, further flattening of the preliminary diffusion chamber 16 can further enhance the fuel diffusion effect. it can.
[0031]
The plurality of fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2 of the injector plate 17 are arranged on a pitch circle centered on the axis of the valve seat hole 2b, and the pitch circle has a diameter D 2. Since it is set larger than the inner diameter D 1 of the valve seat hole 2b, the passage from the valve seat hole 2b to the fuel injection holes 17 1 , 17 1 ; 17 1 , 17 2 is suppressed, and the diffusion function for the fuel in the diffusion chamber 23 Can be made accurate.
[0032]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
[0033]
【The invention's effect】
As described above, according to the first feature of the present invention, a valve housing in which a valve seat and a valve seat member having a valve seat hole connected to the central portion of the valve seat at one end are integrally coupled, and the valve housing Electromagnetic fuel injection comprising: a valve body that is slidably received and faces the valve seat; and a flat injector plate that is joined to one end surface of the valve seat member and has a plurality of fuel injection holes. in the valve, the valve seat member between the valve seat hole and the valve seat, the valve seat a first recess having a conical bottom surface of the taper angle made larger than the taper angle of said valve seat in said valve seat hole coaxial formed by more recessed, the first recess and the valve body at the distal end face defines a preliminary diffusion chamber for diffusing by colliding the high pressure fuel that has passed through the valve seat conical bottom of the valve seat member An annular weld that forms a second recess coaxial with the valve seat hole on one end surface and surrounds the second recess More bonded directly to the upper surface of the injector plate to said one end face, by the upper surface of the second recess and the injector plate, is provided with the flat fuel diffusion chamber which communicates between the valve seat hole and the fuel injection hole, a valve seat The high-pressure fuel that has passed through can be diffused in two stages in the preliminary diffusion chamber and the diffusion chamber, and the spray direction and spray angle of the fuel injected from each fuel injection hole can be stabilized. Further, the fuel diffusion effect can be further enhanced by further flattening the preliminary diffusion chamber by arranging the virtual vertex of the conical bottom surface of the preliminary diffusion chamber in the valve seat hole.
[0034]
Further, according to the second feature of the present invention, since the distance from the tip of the valve body in the open state to the bottom surface of the diffusion chamber is set smaller than the inner diameter of the valve seat hole, the preliminary diffusion chamber and the diffusion chamber are flattened. It can contribute to reduction of dead volume and improvement of fuel diffusion effect. Moreover, since the cross sectional area of the valve seat hole is set to be equal to or larger than the total cross sectional area of the plurality of fuel injection holes, there is no significant drop in fuel pressure before the fuel reaches the diffusion chamber from the valve seat. The fuel in the diffusion chamber does not occur and is injected from each fuel injection hole while maintaining a high pressure, and a good atomization state can be ensured.
[0035]
Further according to the third aspect of the present invention, Lee down the plurality of fuel injection holes of Jefferies Kuta plate, as well as arranged on a pitch circle about the axis of the valve seat hole, the valve seat hole the diameter of the pitch circle Since the passage from the valve seat hole to the fuel injection hole is suppressed, the diffusion function for the fuel in the diffusion chamber can be made accurate.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part of an internal combustion engine equipped with an electromagnetic fuel injection valve of the present invention.
FIG. 2 is a longitudinal sectional view of the electromagnetic fuel injection valve.
FIG. 3 is an enlarged view of a main part of FIG.
4 is an enlarged view of part 4 in FIG. 3. FIG.
FIG. 5 is a view taken in the direction of arrow 5 in FIG.
6 is a view corresponding to FIG. 5, showing a valve open state of the valve body.
[Explanation of symbols]
D 1 ... Inner diameter of valve seat hole D 2 ... Diameter of pitch circle I ... Electromagnetic fuel injection valve H ... Distance S 1 ... Transverse area S 2 of valve seat hole・ Total cross-sectional area θ 1 of the plurality of fuel injection holes 1 ··· Taper angle of the valve seat 2 ··· Taper angle 1 of the bottom of the pre-diffusion chamber 1 ··· Valve housing 2a ··· Valve seat 2b ··· Valve Seat hole
2c ... 1st recessed part
2d ... second recess 4 ... valve body 5 ... movable core 7 ... fixed core 10 ... coil 13 ... valve spring 17 ... injector plate 16 ... preliminary diffusion chamber 16a · · preliminary diffusion chamber bottom 17 ... injector plate 17 1, 1 2 ... fuel injection holes 22 ... pitch circle 23 bottom of ... diffusion chamber 23a · · diffusion chamber (injector plate Top surface)

Claims (3)

弁座（２ａ）及びこの弁座（２ａ）の中心部に連なる弁座孔（２ｂ）を一端部に有する弁座部材（２）を一体に結合した弁ハウジング（１）と、この弁ハウジング（１）に摺動可能に収容されて前記弁座（２ａ）に対向する弁体（４）と、この弁体（４）を前記弁座（２ａ）に向かう閉弁方向へ付勢する弁ばね（１３）と、前記弁座部材（２）の他端側で前記弁ハウジング（１）に設けられて励起時に前記弁体（４）を開弁させるコイル（１０）と、前記弁座部材（２）の一端面に接合されて、前記弁座孔（２ｂ）に連通する複数の燃料噴孔（１７1 ，１７2 ）が穿設された平板状のインジェクタプレート（１７）とを備えた電磁式燃料噴射弁において、
前記弁座孔（２ｂ）と弁座（２ａ）との間で前記弁座部材（２）に、該弁座孔（２ｂ）と同軸で該弁座（２ａ）のテーパ角度（θ1 ）より大なるテーパ角度（θ2 ）の円錐状底面（１６ａ）を有する第１の凹部（２ｃ）を該弁座（２ａ）より凹ませて形成すると共に、前記円錐状底面（１６ａ）の仮想頂点（Ｐ）を前記弁座孔（２ｂ）内に配置し、前記第１の凹部（２ｃ）と前記弁体（４）の先端面とで、前記弁座（２ａ）を通過した高圧燃料を前記円錐状底面（１６ａ）に衝突させて拡散させる予備拡散室（１６）を画成し、前記弁座部材（２）の一端面に、前記弁座孔（２ｂ）と同軸の第２の凹部（２ｄ）を形成すると共に、この第２の凹部（２ｄ）を取り囲む環状溶接部（２０）により前記インジェクタプレート（１７）の上面（２３ａ）を前記一端面に直接結合し、前記第２の凹部（２ｄ）と前記インジェクタプレート（１７）の上面（２３ａ）とにより、前記弁座孔（２ｂ）及び前記燃料噴孔（１７ 1 ，１７ 2 ）間を連通する偏平な燃料拡散室（２３）を設けたことを特徴とする、電磁式燃料噴射弁。 A valve housing (1) in which a valve seat (2a) having a valve seat (2b) connected to the central portion of the valve seat (2a) and the valve seat (2a) at one end is integrally coupled, and the valve housing ( a valve body 1) it is slidably accommodated facing the valve seat (2a) (4), a valve spring biasing the valve closing direction toward the valve seat to the valve body (4) (2a) and (13), a coil (10) for opening said valve (4) upon excitation provided in the valve housing (1) at the other end of the valve seat member (2), the valve seat member ( 2) an electromagnetic wave comprising a flat plate-like injector plate (17) joined to one end face of 2) and having a plurality of fuel injection holes (17 1 , 17 2 ) communicating with the valve seat hole (2b). Type fuel injection valve,
The valve seat member (2) between the valve seat hole (2b) and the valve seat (2a), than the taper angle (theta 1) of the valve seat hole (2b) and said valve seat coaxial (2a) A first concave portion (2c) having a conical bottom surface (16a) with a large taper angle (θ 2 ) is formed to be recessed from the valve seat (2a), and a virtual vertex of the conical bottom surface (16a) ( the P) arranged on the valve seat hole (2b) in said at the first recess (2c) and the distal end surface of the valve body (4), the high-pressure fuel that has passed through the valve seat (2a) conical A pre-diffusion chamber (16) for diffusing by colliding with the bottom surface (16a) is defined , and a second recess (2d) coaxial with the valve seat hole (2b) is formed on one end surface of the valve seat member (2). ), And the upper surface (23a) of the injector plate (17) by the annular welded portion (20) surrounding the second recess (2d). ) Directly to the one end face, and the valve seat hole (2b) and the fuel injection holes (17 1 , 17 ) are formed by the second recess (2d) and the upper surface (23a) of the injector plate (17). 2 ) An electromagnetic fuel injection valve provided with a flat fuel diffusion chamber (23) communicating with each other . 請求項１記載の電磁式燃料噴射弁において、
前記弁座孔（２ｂ）の横断面積（Ｓ 1 ）を前記複数の燃料噴孔（１７ 1 ，１７ 2 ）の総合横断面積（Ｓ 2 ）と同等、若しくはそれより大きく設定し、開弁状態の前記弁体（４）の先端から前記インジェクタプレート（１７）の上面（２３ａ）までの距離（Ｈ）を前記弁座孔（２ｂ）の内径（Ｄ1 ）より小さく設定したことを特徴とする、電磁式燃料噴射弁。The electromagnetic fuel injection valve according to claim 1,
The cross sectional area (S 1 ) of the valve seat hole (2b) is set equal to or larger than the total cross sectional area (S 2 ) of the plurality of fuel injection holes (17 1 , 17 2 ) , characterized in that the distance (H) up to the upper surface (23a) of the valve element (4) from said tip injector plate (17) of the set to be smaller than the inner diameter (D 1) of the valve seat hole (2b) Electromagnetic fuel injection valve. 請求項１又は２記載のものにおいて、
前記複数の燃料噴孔（１７1 ，１７2 ）を、前記弁座孔（２ｂ）の軸線を中心とするピッチ円上に配置すると共に、そのピッチ円の直径（Ｄ2 ）を前記弁座孔（２ｂ）の内径（Ｄ1 ）より大きく設定したことを特徴とする、電磁式燃料噴射弁。In claim 1 or 2,
Said plurality of fuel injection holes (17 1, 17 2), while disposed on a pitch circle about the axis of the valve seat hole (2b), wherein the diameter (D 2) of the pitch circle valve seat hole An electromagnetic fuel injection valve, which is set larger than the inner diameter (D 1 ) of (2b).
JP27008598A 1998-09-24 1998-09-24 Electromagnetic fuel injection valve Expired - Lifetime JP3777259B2 (en)

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