FUEL INJECTION VALVE

PROBLEM TO BE SOLVED: To provide a fuel injection valve which makes the whole structure of fuel passage for applying a swirling force to fuel compact, minimizes a dead volume, atomizes fuel spray and permits satisfactory pressure resistance.SOLUTION: Injection holes 36 of an injection hole plate 35...

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Bibliographische Detailangaben
Hauptverfasser: CHAZONO FUMIYA, MUNEZANE TAKESHI, ITO KEISUKE, KAWASAKI SHOTA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a fuel injection valve which makes the whole structure of fuel passage for applying a swirling force to fuel compact, minimizes a dead volume, atomizes fuel spray and permits satisfactory pressure resistance.SOLUTION: Injection holes 36 of an injection hole plate 35 as a top end part of a fuel injection valve 1, a swirling chamber 41 and a swirling passage 42 are set such that fuel sprays injected from the two adjacent injection holes 36 interfere with each other on the upstream side rather than a position on which the fuel spray splits from the state of fuel liquid films 51 and is turned into a fuel liquid string 52. The hollow conical fuel liquid films 51 have uneven circumferential thickness and interfere with each other so as to avoid such a part 51a that the circumferential thickness is thickest and, therefore, deterioration of atomization due to interference between the fuel liquid films 51 can be suppressed. Further, a distance between the adjacent injection holes 36 can be decreased, therefore, the whole fuel passage is made compact, a dead volume can be reduced and the atomization of fuel spray on the initial spraying is improved.SELECTED DRAWING: Figure 3 【課題】燃料に旋回力を付与する燃料通路の全体構造がコンパクトでデッドボリュームが小さく、燃料噴霧の微粒化が図られると共に耐圧性が良好な燃料噴射弁を提供する。【解決手段】燃料噴射弁1の先端部である噴孔プレート35の噴孔36、旋回室41および旋回用通路42は、隣接する2つの噴孔36から噴射される燃料噴霧が、燃料液膜51の状態から分裂して燃料液糸52となる位置よりも上流側で干渉するように設定されている。中空円錐状の燃料液膜51は周方向の厚さが不均一であり、周方向の厚さが最も厚い部分51aを避けて干渉し合うので、燃料液膜51同士の干渉による微粒化の悪化を抑制することができる。また、隣接する噴孔36間の距離を小さくすることができるため、燃料通路全体のコンパクト化が図られ、デッドボリュームを低減することが可能となり、噴射初期の燃料噴霧の微粒化の向上が図られる。【選択図】図3