JP2021028472A - Fuel injection device - Google Patents

Fuel injection device Download PDF

Info

Publication number
JP2021028472A
JP2021028472A JP2017229801A JP2017229801A JP2021028472A JP 2021028472 A JP2021028472 A JP 2021028472A JP 2017229801 A JP2017229801 A JP 2017229801A JP 2017229801 A JP2017229801 A JP 2017229801A JP 2021028472 A JP2021028472 A JP 2021028472A
Authority
JP
Japan
Prior art keywords
flow path
injection hole
fuel injection
downstream side
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2017229801A
Other languages
Japanese (ja)
Inventor
拓矢 渡井
Takuya WATAI
拓矢 渡井
威生 三宅
Takeo Miyake
威生 三宅
保夫 生井沢
Yasuo Namaizawa
保夫 生井沢
明靖 宮本
Akiyasu Miyamoto
明靖 宮本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Priority to JP2017229801A priority Critical patent/JP2021028472A/en
Priority to PCT/JP2018/041789 priority patent/WO2019107126A1/en
Publication of JP2021028472A publication Critical patent/JP2021028472A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

To inhibit adhesion of fuel to the tip of a fuel injection device, and design an arbitrary penetration.SOLUTION: An injection hole 117 comprises a flow path reduction part 117A that is formed on an upstream side and whose flow path cross-sectional area becomes smaller toward a downstream side, and a flow path expansion part 107B that is formed on the downstream side of the flow path reduction part 117A and whose flow path cross-sectional area increases toward the downstream side. An axial length L of the flow path reducing part 107A on the upstream side and the axial length L' of the flow path expansion part 107B on the downstream side are configured to have a relation of L'<L<2L'.SELECTED DRAWING: Figure 2

Description

本発明は、燃料噴射装置に関する。 The present invention relates to a fuel injection device.

本技術分野の背景技術として、特開２００９−８０８７号公報（特許文献１）がある。この公報には、「少なくとも１つの噴霧孔（１）はノズル本体の内側に孔入口（９）、およびノズル本体（３）の外側に孔出口（１１）を有する。噴霧孔（１）には孔入口部分（１５）が設けられ、孔入口（９）から開始するこの孔入口部分（１５）は、孔入口（９）における比較的より大きな流れ面積から孔入口部分（１５）の終端と孔出口部分（１７）の開始点との間の交差部分における比較的小さな流れ面積まで減少する流れ面積を有する。孔入口部分（１５）との交差部分から開始する孔出口部分（１７）は、孔入口部分（１５）との交差部分における比較的小さな流れ面積から孔出口（１１）における比較的より大きな流れ面積まで増加する流れ面積を有する。」技術が開示されていると記載されている（要約参照）。 As a background technology in this technical field, there is Japanese Patent Application Laid-Open No. 2009-8087 (Patent Document 1). In this publication, "at least one spray hole (1) has a hole inlet (9) inside the nozzle body and a hole outlet (11) outside the nozzle body (3). The spray hole (1) has a hole outlet (1). The hole inlet portion (15) is provided and the hole inlet portion (15) starting from the hole inlet (9) is the end and hole of the hole inlet portion (15) from a relatively larger flow area at the hole inlet (9). It has a flow area that is reduced to a relatively small flow area at the intersection with the start point of the exit portion (17). The hole exit portion (17) starting from the intersection with the hole inlet portion (15) is a hole. It has a flow area that increases from a relatively small flow area at the intersection with the inlet portion (15) to a relatively larger flow area at the hole exit (11). ”It is stated that the technique is disclosed (summary). reference).

特開２００９−８０８７号公報JP-A-2009-8087

内燃機関の有害排気成分低減のためには、燃料噴射装置先端の燃料付着を抑制し、かつ、任意のペネトレーション（噴霧の軸方向長さ）の設計が求められている。上記特許文献１の燃料噴射装置の噴孔ノズルは、孔入口における比較的より大きな流れ面積から孔入口部分の終端と孔出口部分の開始点との間の交差部分における比較的小さな流れ面積まで減少する流れ面積を有し、孔入口部分との交差部分から開始する孔出口部分は、孔入口部分との交差部分における比較的小さな流れ面積から孔出口における比較的より大きな流れ面積まで増加する流れ面積を有した形状を提案させている。 In order to reduce harmful exhaust components of an internal combustion engine, it is required to suppress fuel adhesion at the tip of a fuel injection device and to design an arbitrary penetration (axial length of spray). The injection hole nozzle of the fuel injection device of Patent Document 1 is reduced from a relatively large flow area at the hole inlet to a relatively small flow area at the intersection between the end of the hole inlet portion and the start point of the hole outlet portion. The hole exit portion, which has a flow area to be formed and starts from the intersection with the hole inlet portion, increases from a relatively small flow area at the intersection with the hole inlet portion to a relatively large flow area at the hole outlet. We are proposing a shape with.

しかしながら、上記特許文献１に開示されている構成では、噴孔出口にかけて流れ面積が増加する噴孔形状部が、噴孔入口から流れ面積が減少する噴孔形状部に対して小さく、流れ面積が増加する噴孔形状部に燃料噴霧が引き寄せられるため、燃料が付着しやすく、デポジット蓄積の原因になり、有害排気成分の増加原因になる。 However, in the configuration disclosed in Patent Document 1, the injection hole shape portion in which the flow area increases toward the injection hole outlet is smaller than the injection hole shape portion in which the flow area decreases from the injection hole inlet, and the flow area is smaller. Since the fuel spray is attracted to the increasing nozzle shape, the fuel easily adheres, which causes the accumulation of deposits and causes the increase of harmful exhaust components.

また、噴孔をレーザー加工機によって穴加工した場合、レーザー加工の原理からステップホールを設けることが極めて困難であり、噴孔長さＬと噴孔径Ｄの比であるＬ／Ｄ値がブランク形状の肉厚に依存するため、ペネトレーションの設計が困難になる。 Further, when the injection hole is machined by a laser processing machine, it is extremely difficult to provide a step hole due to the principle of laser processing, and the L / D value which is the ratio of the injection hole length L and the injection hole diameter D is a blank shape. It is difficult to design the penetration because it depends on the wall thickness of the.

そこで、本発明は、燃料噴射装置先端の燃料付着を抑制しつつ、噴孔長さＬと噴孔径Ｄの比であるＬ／Ｄの調整を可能とした燃料噴射装置を提供する。 Therefore, the present invention provides a fuel injection device capable of adjusting L / D, which is the ratio of the injection hole length L and the injection hole diameter D, while suppressing fuel adhesion at the tip of the fuel injection device.

上記課題を解決するために、本発明の燃料噴射装置は、燃料流路を開閉する弁体と、弁体シート部が着座するシート部と、前記シート部の下流側に位置する噴射孔が形成される噴射孔形成部材と、を備えた燃料噴射弁において、前記噴射孔は、上流側に形成され下流側に向かうにつれ流路断面積が小さくなる流路縮小部と、前記流路縮小部よりも下流側に形成され下流側に向かうにつれ流路断面積が大きくなる流路拡大部とを備え、上流側の前記流路縮小部の軸方向長さＬ、下流側の前記流路拡大部の軸方向長さＬ´がＬ´＜Ｌ＜２Ｌ´の関係にあるように構成される。 In order to solve the above problems, in the fuel injection device of the present invention, a valve body that opens and closes the fuel flow path, a seat portion on which the valve body seat portion is seated, and an injection hole located on the downstream side of the seat portion are formed. In the fuel injection valve provided with the injection hole forming member, the injection hole is formed on the upstream side, and the flow path cross-sectional area becomes smaller toward the downstream side. Also provided with a flow path expanding portion formed on the downstream side and increasing the flow path cross-sectional area toward the downstream side, the axial length L of the flow path reducing portion on the upstream side, and the flow path expanding portion on the downstream side. The axial length L'is configured to have a relationship of L'<L <2L'.

本発明の燃料噴射装置によれば、燃料噴射装置先端の燃料の付着を抑止し、かつ、任意のペネトレーションの設計を目的とする。 According to the fuel injection device of the present invention, it is an object of suppressing the adhesion of fuel at the tip of the fuel injection device and designing an arbitrary penetration.

燃料噴射装置の全体を示す断面図である。It is sectional drawing which shows the whole of the fuel injection apparatus. 噴孔カップ１０６周辺の断面拡大図である。It is a cross-sectional enlarged view around the injection hole cup 106. Ｌ／Ｄとペネトレーションの関係である。It is the relationship between L / D and penetration. 噴孔カップ１０６周辺の断面拡大図である。It is a cross-sectional enlarged view around the injection hole cup 106. 噴孔カップ１０６周辺の断面拡大図（ＬｓよりＬｔの方が長くなる構成時）である。It is a cross-sectional enlarged view around the injection hole cup 106 (when Lt is longer than Ls). θが４５°以下の場合のレーザー加工の概要を示す図である。It is a figure which shows the outline of the laser processing when θ is 45 ° or less. θが４５°以上の場合のレーザー加工の概要を示す図である。It is a figure which shows the outline of the laser processing when θ is 45 ° or more.

以下、本発明の実施例について、図面を用いて説明する。 Hereinafter, examples of the present invention will be described with reference to the drawings.

図１から図４を用いて、本発明の実施例に係る燃料噴射装置２０４の構成について説明する。図１は本実施例による燃料噴射装置２０４の縦断面図である。図２と図４は図１の噴孔カップ１１６周辺を中心とした部分拡大図で、本実施例における燃料噴射装置２０４の特徴となる部品に限定し、形状を簡略化して示したものである。 The configuration of the fuel injection device 204 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a vertical cross-sectional view of the fuel injection device 204 according to the present embodiment. 2 and 4 are partially enlarged views centered on the periphery of the injection hole cup 116 of FIG. 1, and are limited to the characteristic parts of the fuel injection device 204 in this embodiment and are shown in a simplified shape. ..

図２から図４では動作や機能を分かり易くするために部品の大きさや隙間の大きさは実際の比率と異なり、機能を説明するために不要な部品は省略されている。各図面において同一の構成要素には同一の符号が与えられており、重複する説明は省略している。 In FIGS. 2 to 4, the size of the parts and the size of the gap are different from the actual ratios in order to make the operation and the function easy to understand, and unnecessary parts are omitted for explaining the function. In each drawing, the same components are given the same reference numerals, and duplicate description is omitted.

図１において、噴孔カップ支持体１０１は直径が小さい小径筒状部２２と直径が大きい大径筒状部２３とを備えている。小径筒状部２２の先端部分の内周部に、案内部１１５、燃料噴射孔１１７（噴射孔と呼んでも良い）が形成された噴孔カップ（燃料噴射孔形成部材）１１６が挿入または圧入される。噴孔カップ１１６の先端面の外周部の縁部が燃料噴射装置２０４の軸方向から全周溶接されることにより、小径筒状部２２に固定される。案内部１１５は可動部材である針弁１１４Ａの先端に設けられる。針弁１１４Ａの下流部が燃料噴射装置２０４の軸方向に上下運動する際に、その外周部を案内する機能を有する。 In FIG. 1, the injection hole cup support 101 includes a small-diameter tubular portion 22 having a small diameter and a large-diameter tubular portion 23 having a large diameter. An injection hole cup (fuel injection hole forming member) 116 having a guide portion 115 and a fuel injection hole 117 (which may be called an injection hole) is inserted or press-fitted into the inner peripheral portion of the tip portion of the small-diameter tubular portion 22. To. The edge of the outer peripheral portion of the tip surface of the injection hole cup 116 is fixed to the small-diameter tubular portion 22 by welding all around the fuel injection device 204 from the axial direction. The guide portion 115 is provided at the tip of the needle valve 114A, which is a movable member. When the downstream portion of the needle valve 114A moves up and down in the axial direction of the fuel injection device 204, it has a function of guiding the outer peripheral portion thereof.

噴孔カップ１１６には案内部１１５の下流側に円錐状のシート部３９が形成されている。このシート部３９には針弁１１４Ａの先端に設けた針弁１１４Ａが当接または燃料の流れを遮断するシート部が形成される。またシート部３９のシート部から針弁１１４Ａの先端の弁体シート部が離れると高圧燃料が燃料噴射孔１１７を通過して噴射される。噴孔カップ支持体１０１の外周部には溝が形成されており、この溝に樹脂材製のチップシール１３２に代表される燃焼ガスのシール部材が嵌め込まれている。 A conical sheet portion 39 is formed in the injection hole cup 116 on the downstream side of the guide portion 115. The seat portion 39 is formed with a seat portion where the needle valve 114A provided at the tip of the needle valve 114A abuts or blocks the flow of fuel. Further, when the valve body seat portion at the tip of the needle valve 114A is separated from the seat portion of the seat portion 39, high-pressure fuel is injected through the fuel injection hole 117. A groove is formed in the outer peripheral portion of the injection hole cup support 101, and a combustion gas sealing member represented by a resin tip seal 132 is fitted in the groove.

噴孔カップ支持体１０１の大径筒状部２３の内周下端部には可動部材である針弁１１４Ａの上流部をガイドする針弁案内部材１１３が大径筒状部２３の絞り加工部２５に圧入固定されている。針弁案内部材１１３は中央に針弁１１４Ａをその軸方向にガイドする案内部１２７が設けられており、その周囲に複数個の燃料通路１２６が穿孔されている。細長い形状の針弁１１４Ａの上流部は針弁案内部材１１３の案内部１２７によって径方向の位置を規定され、かつ軸方向にまっすぐに往復運動するようガイドされる。なお図１において、開弁方向は弁軸方向における上方向、閉弁方向は弁軸方向における下方向である。 At the lower end of the inner circumference of the large-diameter tubular portion 23 of the injection hole cup support 101, a needle valve guide member 113 that guides the upstream portion of the needle valve 114A, which is a movable member, is a drawing portion 25 of the large-diameter tubular portion 23. It is press-fitted and fixed to. The needle valve guide member 113 is provided with a guide portion 127 for guiding the needle valve 114A in the axial direction in the center, and a plurality of fuel passages 126 are perforated around the guide portion 127. The upstream portion of the elongated needle valve 114A is positioned in the radial direction by the guide portion 127 of the needle valve guide member 113, and is guided to reciprocate straight in the axial direction. In FIG. 1, the valve opening direction is an upward direction in the valve axis direction, and the valve closing direction is a downward direction in the valve axis direction.

針弁１１４Ａは、弁体先端部１１４Ｂが設けられている下端部と反対の上流部に針弁１１４Ａの直径より大きい外径を有する段付き部１２９を有する頭部１１４Ｃが設けられている。段付き部１２９の上端面には針弁１１４Ａを閉弁方向に付勢するスプリング１１０の着座面が設けられており、頭部１１４Ｃと併せてスプリング１１０を保持する。 The needle valve 114A is provided with a head 114C having a stepped portion 129 having an outer diameter larger than the diameter of the needle valve 114A at an upstream portion opposite to the lower end portion where the valve body tip portion 114B is provided. A seating surface of the spring 110 that urges the needle valve 114A in the valve closing direction is provided on the upper end surface of the stepped portion 129, and holds the spring 110 together with the head 114C.

針弁１１４Ａとは別体で構成された可動子１０２は針弁１１４Ａが貫通する貫通孔１２８を中央に有する。可動子１０２と針弁案内部材１１３との間に可動子１０２を開弁方向に付勢するゼロスプリング１１２が保持されている。 The mover 102, which is separate from the needle valve 114A, has a through hole 128 through which the needle valve 114A penetrates in the center. A zero spring 112 that urges the mover 102 in the valve opening direction is held between the mover 102 and the needle valve guide member 113.

頭部１１４Ｃの段付き部１２９の直径より貫通孔１２８の直径の方が小さいので、針弁１１４Ａを噴孔カップ１１６のシート部に向かって押付けるスプリング１１０の付勢力もしくは重力の作用下においては、ゼロスプリング１１２によって保持された可動子１０２の上側面と針弁１１４Ａの段付き部１２９の下端面が当接し、両者は係合している。可動子１０２がゼロスプリング１１２の付勢力により重力に逆らう上方へ動いた場合には可動子１０２の上側面と針弁１１４Ａの段付き部１２９の下端面とが協働して動作する。一方でスプリング１１０の付勢力により、可動子１０２が重力に沿った下方へ動いた場合にも、可動子１０２の上側面と針弁１１４Ａの段付き部１２９の下端面とが協働して動作する。 Since the diameter of the through hole 128 is smaller than the diameter of the stepped portion 129 of the head 114C, the needle valve 114A is pressed toward the seat portion of the injection hole cup 116 under the urging force of the spring 110 or the action of gravity. , The upper side surface of the mover 102 held by the zero spring 112 and the lower end surface of the stepped portion 129 of the needle valve 114A are in contact with each other, and they are engaged with each other. When the mover 102 moves upward against gravity due to the urging force of the zero spring 112, the upper side surface of the mover 102 and the lower end surface of the stepped portion 129 of the needle valve 114A operate in cooperation with each other. On the other hand, even when the mover 102 moves downward along the gravity due to the urging force of the spring 110, the upper side surface of the mover 102 and the lower end surface of the stepped portion 129 of the needle valve 114A operate in cooperation with each other. To do.

噴孔カップ支持体１０１の大径筒状部２３の内周部には固定コア１０７が圧入され、圧入接触位置１１８で溶接接合されている。この溶接接合により噴孔カップ支持体１０１の大径筒状部２３の内部と外気との間に形成される隙間が密閉される。固定コア１０７は中心に針弁１１４Ａの段付き部１２９の直径よりわずかに大きい直径の貫通孔１０７Ｄが燃料導入通路として設けられている。 A fixed core 107 is press-fitted into the inner peripheral portion of the large-diameter tubular portion 23 of the injection hole cup support 101, and is welded and joined at the press-fit contact position 118. By this welding joint, the gap formed between the inside of the large-diameter tubular portion 23 of the injection hole cup support 101 and the outside air is sealed. The fixed core 107 is provided with a through hole 107D having a diameter slightly larger than the diameter of the stepped portion 129 of the needle valve 114A as a fuel introduction passage in the center.

固定コア１０７の下端面や、可動子１０２の上端面及び衝突端面にはメッキを施して耐久性を向上させても良い。可動子１０２に比較的、軟らかい軟磁性ステンレス鋼を用いた場合においても、硬質クロムメッキや無電解ニッケルメッキを用いることで、耐久信頼性を確保することができる。 The lower end surface of the fixed core 107, the upper end surface of the mover 102, and the collision end surface may be plated to improve durability. Even when a relatively soft soft magnetic stainless steel is used for the mover 102, durability and reliability can be ensured by using hard chrome plating or electroless nickel plating.

針弁１１４Ａの頭部１１４Ｃに設けられた段付き部１２９の上端面に形成されたスプリング受け面にはスプリング１１０の下端が当接することで、針弁１１４Ａは下方向に付勢される。スプリング１１０の他端は固定コア１０７の貫通孔１０７Ｄの内部に圧入されて固定される調整子５４で受け止められることで、スプリング１１０が頭部１１４Ｃと調整子５４の間に保持されている。調整子５４の固定位置を調整することでスプリング１１０が針弁１１４Ａをシート部３９に押付ける初期荷重を調整することができる。 The lower end of the spring 110 comes into contact with the spring receiving surface formed on the upper end surface of the stepped portion 129 provided on the head 114C of the needle valve 114A, so that the needle valve 114A is urged downward. The other end of the spring 110 is received by the adjuster 54 which is press-fitted into the through hole 107D of the fixed core 107 and fixed, so that the spring 110 is held between the head 114C and the adjuster 54. By adjusting the fixed position of the adjuster 54, the initial load that the spring 110 presses the needle valve 114A against the seat portion 39 can be adjusted.

噴孔カップ支持体１０１の大径筒状部２３の外周には円筒形状のハウジング１０３が固定される。ハウジング１０３の底部には中央に貫通孔が設けられており、貫通孔には噴孔カップ支持体１０１の大径筒状部２３が挿入されて固定される。ハウジング１０３の内周部は噴孔カップ支持体１０１の大径筒状部２３の外周面に対向して外周ヨーク部を形成する。またハウジング１０３の外周部の内周面はコイル１０５と対向するように構成され、外周ヨーク部を形成する。 A cylindrical housing 103 is fixed to the outer periphery of the large-diameter tubular portion 23 of the injection hole cup support 101. A through hole is provided in the center of the bottom of the housing 103, and the large-diameter tubular portion 23 of the injection hole cup support 101 is inserted into the through hole and fixed. The inner peripheral portion of the housing 103 forms an outer peripheral yoke portion facing the outer peripheral surface of the large-diameter tubular portion 23 of the injection hole cup support 101. Further, the inner peripheral surface of the outer peripheral portion of the housing 103 is configured to face the coil 105, and forms the outer peripheral yoke portion.

ハウジング１０３によって形成される筒状空間内には環状を成すように巻回されたコイル１０５が配置されている。コイル１０５は半径方向外側に向かって開口する断面がＵ字状の溝を持つ環状のコイルボビン１０４と、この溝の中に巻きつけられた銅線で形成される。コイル１０５の巻き始め、巻き終わり端部には剛性のある導体１０９が固定されており、固定コア１０７に設けた貫通孔より引き出されている。この導体１０９と固定コア１０７、噴孔カップ支持体１０１の大径筒状部２３の外周はハウジング１０３の上端開口部内周から絶縁樹脂が注入され、モールド成形され、樹脂成形体１３１で覆われる。かくして、コイル１０５の周りにトロイダル状の磁気通路が形成される。 A coil 105 wound so as to form an annular shape is arranged in the tubular space formed by the housing 103. The coil 105 is formed of an annular coil bobbin 104 having a U-shaped groove having a cross section that opens outward in the radial direction, and a copper wire wound in the groove. A rigid conductor 109 is fixed to the winding start and winding end ends of the coil 105, and is pulled out from a through hole provided in the fixed core 107. The outer periphery of the large-diameter tubular portion 23 of the conductor 109, the fixed core 107, and the injection hole cup support 101 is injected with insulating resin from the inner circumference of the upper end opening of the housing 103, molded, and covered with the resin molded body 131. Thus, a toroidal magnetic path is formed around the coil 105.

導体１０９の先端部に形成されたコネクタ４３Ａには高電圧電源、バッテリ電源より電力を供給するプラグが接続され、図示しないエンジンコントロールユニット（ＥＣＵ）によって通電、非通電が制御される。コイル１０５に駆動電流が流れると、固定コア１０７、可動子１０２、大径筒状部２３、ハウジング１０３等から構成される磁気回路に磁束が流れることで可動子１０２と固定コア１０７との間に磁気吸引力が発生する。可動子１０２が固定コア１０７に吸引される磁気吸引力がスプリング１１０の設定荷重を超えると、可動子１０２が上方へ動く。そして可動子１０２の凹み部の上側面が針弁１１４Ａの段付き部１２９の下端面と係合して、可動子１０２と針弁１１４Ａとが共に上方へ移動する。その後、可動子１０２は可動子１０２の上端面が固定コア１０７の下端面に衝突するまで移動する。 A plug for supplying power from a high-voltage power supply and a battery power supply is connected to the connector 43A formed at the tip of the conductor 109, and energization and de-energization are controlled by an engine control unit (ECU) (not shown). When a drive current flows through the coil 105, magnetic flux flows through a magnetic circuit composed of a fixed core 107, a mover 102, a large-diameter tubular portion 23, a housing 103, and the like, so that a magnetic flux flows between the mover 102 and the fixed core 107. Magnetic attraction is generated. When the magnetic attraction force attracted by the mover 102 to the fixed core 107 exceeds the set load of the spring 110, the mover 102 moves upward. Then, the upper side surface of the recessed portion of the mover 102 engages with the lower end surface of the stepped portion 129 of the needle valve 114A, and the mover 102 and the needle valve 114A both move upward. After that, the mover 102 moves until the upper end surface of the mover 102 collides with the lower end surface of the fixed core 107.

その結果、針弁１１４Ａの先端側の弁体先端部１１４Ｂの弁体シート部がシート部３９より離座することで、燃料が燃料通路１１８を通り、噴孔カップ１１６の先端側に形成された燃料噴射孔１１７を通って内燃機関の燃焼室内に噴射される。 As a result, the valve body seat portion of the valve body tip portion 114B on the tip side of the needle valve 114A is separated from the seat portion 39, so that the fuel passes through the fuel passage 118 and is formed on the tip side of the injection hole cup 116. It is injected into the combustion chamber of the internal combustion engine through the fuel injection hole 117.

可動子１０２は固定コア１０７に吸引されて固定コア１０７と衝突することで反対側の下流側にバウンドするが、針弁１１４Ａは可動子１０２が衝突した後もさらに上方への移動を継続する。つまり、針弁１１４Ａは可動子衝突位置から上側にオーバーシュートし、その後、スプリング１１０に付勢されることで、再び下流方向へ移動する。その後、コイル１０５が通電した状態であれば、針弁１１４Ａの段付き部１２９の下端面が可動子１０２の凹み部の上側面と係合することで針弁１１４Ａは静止する。 The mover 102 is sucked by the fixed core 107 and collides with the fixed core 107 to bounce to the downstream side on the opposite side, but the needle valve 114A continues to move further upward even after the mover 102 collides. That is, the needle valve 114A overshoots upward from the mover collision position, and then is urged by the spring 110 to move in the downstream direction again. After that, when the coil 105 is energized, the lower end surface of the stepped portion 129 of the needle valve 114A engages with the upper side surface of the recessed portion of the mover 102, so that the needle valve 114A comes to rest.

コイル１０５の通電により針弁１１４Ａは、先端側の弁体先端部１１４Ｂの弁体シート部がシート部３９より離座し、上方向に引き上げられ、コイル１０５が非通電となると、針弁１１４Ａは下方向に動いて閉弁する。このように針弁１１４Ａが往復動作をする際に細長い形状の針弁１１４Ａは針弁案内部材１１３の案内部１２７と、噴孔カップ１１６の案内部１１５の２箇所によって弁軸方向に沿って上下方向の往復運動がガイドされる。 When the coil 105 is energized, the valve body seat portion of the valve body tip portion 114B on the distal end side is separated from the seat portion 39 and pulled upward, and when the coil 105 is de-energized, the needle valve 114A is released. It moves downward and closes the valve. When the needle valve 114A reciprocates in this way, the elongated needle valve 114A moves up and down along the valve axis direction by the guide portion 127 of the needle valve guide member 113 and the guide portion 115 of the injection hole cup 116. The reciprocating motion in the direction is guided.

電磁コイル１０５への通電が断たれると、磁束が消滅し、可動子１０２に作用する磁気吸引力も消滅する。この状態では、針弁１１４Ａの頭部１１４Ｃを下流方向に押す初期荷重設定用のスプリング１１０の付勢力がゼロスプリング１１２の上流方向への付勢力に打ち勝って可動子１０２、針弁１１４Ａに作用する。その結果、可動子１０２はスプリング１１０の付勢力によって、弁体先端部１１４Ｂの弁体シート部がシート部３９に接触する閉弁位置に押し戻される。 When the energization of the electromagnetic coil 105 is cut off, the magnetic flux disappears and the magnetic attraction force acting on the mover 102 also disappears. In this state, the urging force of the spring 110 for setting the initial load that pushes the head 114C of the needle valve 114A in the downstream direction overcomes the urging force of the zero spring 112 in the upstream direction and acts on the mover 102 and the needle valve 114A. .. As a result, the mover 102 is pushed back to the valve closing position where the valve body seat portion of the valve body tip portion 114B contacts the seat portion 39 by the urging force of the spring 110.

針弁１１４Ａの先端の弁体先端部１１４Ｂの弁体シート部がシート部３９に接触し閉弁位置にある間、針弁１１４Ａは針弁案内部材１１３の案内部１２７のみによりガイドされており、噴孔カップ１１６の案内部１１５とは接触していない。このとき、頭部１１４Ｃの段付き部１２９が可動子１０２の上面に当接して可動子１０２を、ゼロスプリング１１２の付勢力に打ち勝って針弁案内部材１１３の側へ移動させる。弁体先端部１１４Ｂの弁体シート部がシート部３９に衝突すると、可動子１０２は針弁１１４Ａと別体であるため、慣性力によって針弁案内部材１１３の側への移動を継続する。針弁１１４Ａはシート部３９に衝突した後に、開弁方向に跳ね返る。このとき針弁１１４Ａの外周部と可動子１０２の内周部との間に流体による摩擦が発生するので、運動エネルギが摩擦エネルギに変換されて小さくなる
また慣性質量の大きな可動子１０２が針弁１１４Ａと別体で構成されているため、針弁１１４Ａがシート部３９に衝突した際の運動エネルギが小さくなるため、針弁１１４Ａの跳ね返りが小さくなる。また、可動子１０２の慣性力は可動子１０２と針弁１１４Ａとが一体であることに比べて小さくなるため、ゼロスプリング１１２を圧縮した後に受ける反発力が小さくなる。よって可動子１０２の跳ね返り現象によって針弁１１４Ａが開弁方向に再び動かされる現象は発生し難くなる。結果として、針弁１１４Ａの跳ね返りは最小限に抑えられ、コイル１０４、１０５への通電が断たれた後に針弁１１４Ａが開いて、燃料が不作為に噴射される、いわゆる二次噴射現象が抑制され、エミッション軽減効果が期待できる。 While the valve body seat portion of the valve body tip portion 114B at the tip of the needle valve 114A is in contact with the seat portion 39 and is in the valve closed position, the needle valve 114A is guided only by the guide portion 127 of the needle valve guide member 113. It is not in contact with the guide portion 115 of the injection hole cup 116. At this time, the stepped portion 129 of the head 114C abuts on the upper surface of the mover 102 to overcome the urging force of the zero spring 112 and move the mover 102 toward the needle valve guide member 113. When the valve body seat portion of the valve body tip portion 114B collides with the seat portion 39, the mover 102 is a separate body from the needle valve 114A, and therefore continues to move toward the needle valve guide member 113 by inertial force. After colliding with the seat portion 39, the needle valve 114A rebounds in the valve opening direction. At this time, since friction due to the fluid is generated between the outer peripheral portion of the needle valve 114A and the inner peripheral portion of the mover 102, the kinetic energy is converted into frictional energy and becomes smaller, and the mover 102 having a large inertial mass is the needle valve. Since it is formed separately from the 114A, the kinetic energy when the needle valve 114A collides with the seat portion 39 is reduced, so that the rebound of the needle valve 114A is reduced. Further, since the inertial force of the mover 102 is smaller than that of the mover 102 and the needle valve 114A being integrated, the repulsive force received after compressing the zero spring 112 is small. Therefore, the phenomenon that the needle valve 114A is moved again in the valve opening direction due to the bounce phenomenon of the mover 102 is unlikely to occur. As a result, the rebound of the needle valve 114A is minimized, and the so-called secondary injection phenomenon in which the needle valve 114A opens after the energization of the coils 104 and 105 is cut off and fuel is randomly injected is suppressed. , Emission reduction effect can be expected.

次に、噴孔カップ１１６の噴射孔１１７について詳細に説明する。
図２は図１における噴孔カップ１１６周辺を拡大した図である。本実施例の燃料噴射弁は図１で示したように燃料流路を開閉する弁体（針弁１１４Ａ）と、弁体シート部が着座するシート部３９と、シート部３９の下流側に位置する噴射孔１１７が形成される噴射孔形成部材１１６と、を備えている。噴射孔１１７は、上流側に形成され下流側に向かうにつれ流路断面積が小さくなる流路縮小部１１７Ａと、流路縮小部１１７Ａよりも下流側に形成され下流側に向かうにつれ流路断面積が大きくなる流路拡大部１１７Ｂを備える。そして本実施例では、上流側の流路縮小部１１７Ａの軸方向長さＬ、下流側の流路拡大部１１７Ｂの軸方向長さＬ´がＬ´＜Ｌ＜２Ｌ´の関係にあるように構成される。 Next, the injection hole 117 of the injection hole cup 116 will be described in detail.
FIG. 2 is an enlarged view of the periphery of the injection hole cup 116 in FIG. As shown in FIG. 1, the fuel injection valve of this embodiment is located on the valve body (needle valve 114A) that opens and closes the fuel flow path, the seat portion 39 on which the valve body seat portion is seated, and the downstream side of the seat portion 39. It is provided with an injection hole forming member 116 in which an injection hole 117 is formed. The injection holes 117 are formed in the flow path reduction portion 117A formed on the upstream side and the flow path cross-sectional area becomes smaller toward the downstream side, and the flow path cross-sectional area formed on the downstream side of the flow path reduction portion 117A and toward the downstream side. The flow path expanding portion 117B is provided. In this embodiment, the axial length L of the flow path reducing portion 117A on the upstream side and the axial length L'of the flow path expanding portion 117B on the downstream side have a relationship of L'<L <2L'. It is composed.

本実施例の上記構成によれば、まず流路縮小部１１７Ａにより噴霧形成部を構成する噴射孔１１７の内部の燃料圧力が低下することを抑えることができ減圧沸騰の発生を抑制することが可能である。したがって、噴射孔１１７の有効通路面積が大きくなり、燃料の流れのはく離を抑制し噴孔カップ１１６の下流側（つまりエンジンシリンダの燃焼室側）の表面１１８に付着する燃料を抑制することができる。また、流路拡大部１１７Ｂにより、流路縮小部１１７Ａの軸方向長さＬを調整することが可能となる。流路拡大部１１７Ｂの軸方向長さＬ’により流路縮小部１１７Ａの軸方向長さＬを調整することができるため、これにより噴射孔径Ｄとの比であるＬ／Ｄを調整しペネトレーションを設計することが可能となる。なお、ペネトレーションとは噴射孔１１７から噴射される燃料の噴霧の長さのことである。図３はＬ／Ｄとペネトレーションの関係を示す図であり、Ｌ／Ｄが小さくなるほどペネトレーションは短くなる。ここで、流路拡大部１１７Ｂの軸方向長さＬ´は、製造のし易さ、製造コストの観点から短いほど良い。一方で流路縮小部１１７Ａは噴射孔１１７に流れる燃料の流れを整える機能を有するために軸方向長さＬとして一定の長さが確保される必要がある。このため、幾何学的にＬ´＜Ｌの関係になることが望ましい。しかしながら、有害排気成分の排出に繋がる流路拡大部１１７Ｂの壁面１２２の燃料付着を抑制するためには、噴霧と流路拡大部１１７Ｂとの接触を避けるためには流路拡大部１１７Ｂの噴射孔径Ｄ´部を大きくする必要がある。また、流路拡大部の軸方向長さＬ´は長いほど噴孔カップ１１６の表面１１８と噴霧との距離が長くなるので燃料付着の観点から望ましいが、前記の理由からＬ＜２Ｌ´の関係がよい。図４は図１における噴孔カップ１１６の周辺を拡大した図である。図２と同じ図面であるが、異なる部位の長さや角度を示すための図面である。図２、図４において右側が内径側であり、下側が先端側を示す。図４に示すように本実施例では、下流側の流路拡大部１１７Ｂの軸方向断面において、先端側に位置する先端側内径部の長さＬｔに対し、シート部の側に位置するシート部側内径部の長さＬｓの方が長くなるように構成される。 According to the above configuration of the present embodiment, first, it is possible to suppress a decrease in the fuel pressure inside the injection hole 117 constituting the spray forming portion by the flow path reducing portion 117A, and it is possible to suppress the occurrence of decompression boiling. Is. Therefore, the effective passage area of the injection hole 117 becomes large, the separation of the fuel flow can be suppressed, and the fuel adhering to the surface 118 on the downstream side (that is, the combustion chamber side of the engine cylinder) of the injection hole cup 116 can be suppressed. .. Further, the flow path expanding portion 117B makes it possible to adjust the axial length L of the flow path reducing portion 117A. Since the axial length L of the flow path reducing portion 117A can be adjusted by the axial length L'of the flow path expanding portion 117B, the L / D, which is the ratio to the injection hole diameter D, can be adjusted and the penetration can be performed. It becomes possible to design. The penetration is the length of the fuel sprayed from the injection hole 117. FIG. 3 is a diagram showing the relationship between L / D and penetration, and the smaller the L / D, the shorter the penetration. Here, the axial length L'of the flow path expanding portion 117B is better as it is shorter from the viewpoint of ease of manufacturing and manufacturing cost. On the other hand, since the flow path reducing portion 117A has a function of adjusting the flow of fuel flowing through the injection hole 117, it is necessary to secure a constant length as the axial length L. Therefore, it is desirable that the relationship is geometrically L'<L. However, in order to suppress fuel adhesion on the wall surface 122 of the flow path expanding portion 117B, which leads to the discharge of harmful exhaust components, the injection hole diameter of the flow path expanding portion 117B is to avoid contact between the spray and the flow path expanding portion 117B. It is necessary to increase the D'part. Further, the longer the axial length L'of the flow path expansion portion is, the longer the distance between the surface 118 of the injection hole cup 116 and the spray is, which is desirable from the viewpoint of fuel adhesion. However, for the above reason, the relationship of L <2L'is desirable. Is good. FIG. 4 is an enlarged view of the periphery of the injection hole cup 116 in FIG. It is the same drawing as FIG. 2, but is a drawing for showing the length and angle of different parts. In FIGS. 2 and 4, the right side is the inner diameter side, and the lower side is the tip side. As shown in FIG. 4, in the present embodiment, in the axial cross section of the flow path expansion portion 117B on the downstream side, the seat portion located on the side of the seat portion with respect to the length Lt of the inner diameter portion on the tip side located on the tip side. The length Ls of the inner diameter portion on the side is configured to be longer.

ここで図５の噴孔カップ１１６の断面図のようなＬｓよりＬｔの方が長くなる構成の場合、軸１２４が燃料噴射装置の軸１２６の方向に向いた構成になり、流路縮小部１１７Ａの軸方向長さＬａや流路拡大部１１７Ｂの軸方向長さＬａ‘が幾何学的に長くなりレーザー穴加工が不可能になる。これに対して、本実施例では上記したように、図４のような構成にすることで、噴射孔の加工が幾何学的に可能となる。また本実施例では、流路拡大部１１７Ｂの軸方向断面において、先端側に位置する先端側内径部とシート部３９の側に位置するシート部側内径部との鋭角の交差角度θ´が２９°〜７０°の間になるように構成される。本発明者らの鋭意検討の結果、公差角度θ´が２９°以上あることで噴霧が流路拡大部１１７Ｂの壁面１２２に接触しないようにできることを見出したものである。また、噴霧同士の干渉を抑えるため、７０°以下でないと隣り合う噴射孔１２３と重なりを回避する。 Here, in the case of a configuration in which Lt is longer than Ls as in the cross-sectional view of the injection hole cup 116 of FIG. 5, the shaft 124 is configured to face the direction of the shaft 126 of the fuel injection device, and the flow path reducing portion 117A. The axial length La and the axial length La'of the flow path expansion portion 117B become geometrically long, making laser hole drilling impossible. On the other hand, in the present embodiment, as described above, the injection hole can be geometrically processed by the configuration as shown in FIG. Further, in this embodiment, in the axial cross section of the flow path expanding portion 117B, the acute angle intersection θ'of the tip side inner diameter portion located on the tip side and the seat portion side inner diameter portion located on the sheet portion 39 side is 29. It is configured to be between ° and 70 °. As a result of diligent studies by the present inventors, it has been found that the spray can be prevented from contacting the wall surface 122 of the flow path expansion portion 117B when the tolerance angle θ'is 29 ° or more. Further, in order to suppress the interference between the sprays, the overlap with the adjacent injection holes 123 is avoided unless the temperature is 70 ° or less.

また本実施例では、流路縮小部１１７Ａの軸方向断面において、先端側に位置する先端側内径部と、シート部３９の側に位置するシート部側内径部との鋭角の交差角度θが５°〜４５°の間になるように構成される。本発明者らの鋭意検討の結果、公差角度θが５°以上あることで、噴射孔１１７の流路拡大部１１７Ａの燃料の圧力低下を抑えることができ、減圧沸騰を抑制できることを見出したものである。 Further, in the present embodiment, in the axial cross section of the flow path reduction portion 117A, the acute angle intersection θ between the tip side inner diameter portion located on the tip side and the seat portion side inner diameter portion located on the seat portion 39 side is 5. It is configured to be between ° and 45 °. As a result of diligent studies by the present inventors, it has been found that when the tolerance angle θ is 5 ° or more, the pressure drop of the fuel in the flow path expansion portion 117A of the injection hole 117 can be suppressed and the decompression boiling can be suppressed. Is.

ここで、図６はθが４５°以下の場合の噴孔カップ１１６に対しレーザー加工の概要を示す図である。図６に示すように噴孔カップ１１６に噴射孔１１７を形成する場合、レーザー発信器１４０からレーザー１４１ａを照射し加工をする。ここで、レーザー加工原理から流路縮小部１１７Ａの壁面１２５ａを延長して噴射孔１１７の軸１２４と交わる仮想上の頂点１０９ａと、噴孔カップ１１６ａの表面１１８と噴射孔１１７の軸１２４と交わる仮想上の点１１０との関係は、頂点１０９ａが点１１０より下流側（先端側）にある必要がある。本実施例では上記したようにθを４５°以下とすることで、レーザー発信器１４０によりに流路縮小部１１７Ａを形成することが可能である。 Here, FIG. 6 is a diagram showing an outline of laser machining on the injection hole cup 116 when θ is 45 ° or less. When the injection hole 117 is formed in the injection hole cup 116 as shown in FIG. 6, the laser 141a is irradiated from the laser transmitter 140 for processing. Here, based on the laser machining principle, the wall surface 125a of the flow path reduction portion 117A is extended and intersects the virtual apex 109a that intersects the shaft 124 of the injection hole 117, and the surface 118 of the injection hole cup 116a and the axis 124 of the injection hole 117. Regarding the relationship with the virtual point 110, the vertex 109a needs to be on the downstream side (tip side) of the point 110. In this embodiment, by setting θ to 45 ° or less as described above, it is possible to form the flow path reduction portion 117A by the laser transmitter 140.

次に図７はθが４５°以上の場合のレーザー加工の概要を示す図である。図７に示すようにθｂが４５°以上の形状の場合、流路縮小部１１７Ａ´の壁面１２５ｂを延長して噴射孔１１７´の軸１２４と交わる仮想上の頂点１０９ｂと、噴孔カップ１１６ｂの表面１１８と噴射孔１１７´の軸１２４と交わる仮想上の点１１０との関係は、頂点１０９ｂが点１１０より上流側（燃料噴射弁内側）に構成される。このような形状の場合は、レーザー１４１ｂが流路縮小部１１７Ａ´と流路拡大部１１７Ｂ´の交点１３２と干渉して加工不可能領域１３１が発生してしまう。これに対して本実施例によれば図６で説明したようにため、レーザー発信器１４０によりに流路縮小部１１７Ａを形成することが可能である。 Next, FIG. 7 is a diagram showing an outline of laser machining when θ is 45 ° or more. As shown in FIG. 7, when θb has a shape of 45 ° or more, the virtual apex 109b that extends the wall surface 125b of the flow path reduction portion 117A ′ and intersects the axis 124 of the injection hole 117 ′, and the injection hole cup 116b. The relationship between the surface 118 and the virtual point 110 that intersects the axis 124 of the injection hole 117'is that the apex 109b is located upstream of the point 110 (inside the fuel injection valve). In the case of such a shape, the laser 141b interferes with the intersection 132 of the flow path reducing portion 117A'and the flow path expanding portion 117B', and the unprocessable region 131 is generated. On the other hand, according to the present embodiment, as described with reference to FIG. 6, it is possible to form the flow path reduction portion 117A by the laser transmitter 140.

また本実施例では、噴射孔１１７は、上流側の流路縮小部１１７Ａのうち、テーパ面に対して短い長さで形成される上流側開口部が径方向外側に広がるＲ部１２１により構成する。このＲ部１２１は流体研磨の加工方法にて形成することが望ましい。このような形状にすることで、流れの剥離を低減し、噴霧の揺れを低減することで壁面１２２に付着する燃料を抑制する。 Further, in the present embodiment, the injection hole 117 is composed of an R portion 121 of the flow path reduction portion 117A on the upstream side, in which the upstream opening formed with a shorter length with respect to the tapered surface extends outward in the radial direction. .. It is desirable that the R portion 121 is formed by a processing method of fluid polishing. With such a shape, the separation of the flow is reduced, and the fluctuation of the spray is reduced, so that the fuel adhering to the wall surface 122 is suppressed.

また本実施例では、下流側の流路拡大部１１７Ｂの下流側開口部がＲ部１２１の最大広がり角度に対して径方向外側への広がり角度が小さくなるように構成される。つまり本実施例において、上流側の流路縮小部１１７ＡにはＲ部１２１を形成するものの、下流側の流路拡大部１１７ＢにはＲ部を形成しないように構成している。これにより、必要な噴射形状を確保しつつ生産コストを低減することが可能である。 Further, in this embodiment, the downstream opening of the flow path expanding portion 117B on the downstream side is configured so that the spreading angle outward in the radial direction is smaller than the maximum spreading angle of the R portion 121. That is, in this embodiment, the R portion 121 is formed in the flow path reducing portion 117A on the upstream side, but the R portion is not formed in the flow path expanding portion 117B on the downstream side. As a result, it is possible to reduce the production cost while securing the required injection shape.

なお、本実施例においては上流側の流路縮小部１１７Ａと下流側の流路拡大部１１７Ｂとがそれぞれテーパ形状で構成され、これらの間に一定の径で構成される円筒部１１７Ｃが形成される。燃料が円筒部１１７Ｃに沿った流れを抑制し、流路拡大部１１７Ｂの壁面１２２の燃料付着を抑制する。 In this embodiment, the upstream side flow path reducing portion 117A and the downstream side flow path expanding portion 117B are each formed in a tapered shape, and a cylindrical portion 117C having a constant diameter is formed between them. To. The flow of fuel along the cylindrical portion 117C is suppressed, and the adhesion of fuel to the wall surface 122 of the flow path expansion portion 117B is suppressed.

なお、本実施例において噴射孔形成部材１１６には、噴射孔１１７が複数形成されている。また燃料噴射弁が取り付けられるエンジンシリンダの上部には点火プラグが取り付けられる。そして複数の噴射孔１１７のうち、点火プラグ先端部を最も指向する第一噴射孔の両側に形成される第二噴射孔及び第三噴射孔の流路縮小部１１７Ａと流路拡大部１１７Ｂとの接続部１１７Ｃの流路断面積が他の噴射孔に比べて大きくなるように構成されていることが望ましい。 In this embodiment, a plurality of injection holes 117 are formed in the injection hole forming member 116. A spark plug is attached to the upper part of the engine cylinder to which the fuel injection valve is attached. Among the plurality of injection holes 117, the flow path reducing portions 117A and the flow path expanding portions 117B of the second injection hole and the third injection hole formed on both sides of the first injection hole that most points to the tip of the spark plug. It is desirable that the flow path cross-sectional area of the connecting portion 117C is configured to be larger than that of other injection holes.

つまり、第二噴射孔及び第三噴射孔は、点火プラグ先端部とエンジンピストンとの間において中間位置を指向するものであり、これの噴射孔径を大きくすることでペネトレーションを短くすることが可能となる。よって、エンジンシリンダの壁面、又はピストンへの燃料付着を低減することが可能である。 That is, the second injection hole and the third injection hole direct the intermediate position between the tip of the spark plug and the engine piston, and it is possible to shorten the penetration by increasing the injection hole diameter of the injection hole. Become. Therefore, it is possible to reduce fuel adhesion to the wall surface of the engine cylinder or the piston.

２０４…燃料噴射弁、１１６…噴孔カップ、１１７…噴射孔、１１７Ａ…流路縮小部、１１７Ｂ…流路拡大部。 204 ... Fuel injection valve, 116 ... Injection hole cup, 117 ... Injection hole, 117A ... Flow path reduction section, 117B ... Flow path expansion section.

Claims (6)

燃料流路を開閉する弁体と、弁体シート部が着座するシート部と、前記シート部の下流側に位置する噴射孔が形成される噴射孔形成部材と、を備えた燃料噴射弁において、
前記噴射孔は、上流側に形成され下流側に向かうにつれ流路断面積が小さくなる流路縮小部と、前記流路縮小部よりも下流側に形成され下流側に向かうにつれ流路断面積が大きくなる流路拡大部とを備え、
上流側の前記流路縮小部の軸方向長さＬ、下流側の前記流路拡大部の軸方向長さＬ´がＬ´＜Ｌ＜２Ｌ´の関係にあるように構成された燃料噴射弁。 In a fuel injection valve including a valve body that opens and closes a fuel flow path, a seat portion on which a valve body seat portion is seated, and an injection hole forming member in which an injection hole located on the downstream side of the seat portion is formed.
The injection holes are formed in a flow path reduction portion formed on the upstream side and whose flow path cross-sectional area becomes smaller toward the downstream side, and a flow path cross-sectional area formed on the downstream side of the flow path reduction portion and toward the downstream side. Equipped with a large flow path expansion part,
A fuel injection valve configured such that the axial length L of the flow path reducing portion on the upstream side and the axial length L'of the flow path expanding portion on the downstream side have a relationship of L'<L <2L'. .. 前記噴射孔は、下流側の前記流路拡大部の軸方向断面において、先端側に位置する先端側内径部の長さＬｔに対し、前記シート部の側に位置するシート部側内径部の長さＬｓの方が長くなるように構成された燃料噴射弁。 The injection hole is the length of the inner diameter portion on the seat portion side located on the side of the seat portion with respect to the length Lt of the inner diameter portion on the tip side located on the tip side in the axial cross section of the flow path expansion portion on the downstream side. A fuel injection valve configured so that the Ls is longer. 前記噴射孔は、下流側の前記流路拡大部の軸方向断面において、先端側に位置する先端側内径部と、前記シート部の側に位置するシート部側内径部との鋭角の交差角度が２９°〜７０°の間になるように構成された燃料噴射弁。 The injection hole has an acute angle of intersection between the tip side inner diameter portion located on the tip side and the sheet portion side inner diameter portion located on the seat portion side in the axial cross section of the flow path expansion portion on the downstream side. A fuel injection valve configured to be between 29 ° and 70 °. 請求項１に記載の燃料噴射弁において、
前記噴射孔は、上流側の前記流路縮小部の軸方向断面において、先端側に位置する先端側内径部と、前記シート部の側に位置するシート部側内径部との鋭角の交差角度が５°〜４５°の間になるように構成された燃料噴射弁。 In the fuel injection valve according to claim 1,
In the axial cross section of the flow path reduction portion on the upstream side, the injection hole has an acute angle of intersection between the tip side inner diameter portion located on the tip side and the seat portion side inner diameter portion located on the seat portion side. A fuel injection valve configured to be between 5 ° and 45 °. 請求項１に記載の燃料噴射弁において、
前記噴射孔は、上流側の前記流路縮小部のうち、テーパ面に対して短い長さで形成される上流側開口部が径方向外側に広がるＲ部により構成された燃料噴射弁。 In the fuel injection valve according to claim 1,
The injection hole is a fuel injection valve composed of an R portion having an upstream opening formed in a short length with respect to a tapered surface of the flow path reduction portion on the upstream side and expanding outward in the radial direction. 請求項５に記載の燃料噴射弁において、
下流側の前記流路拡大部の下流側開口部が前記Ｒ部の最大広がり角度に対して径方向外側への広がり角度が小さくなるように構成された燃料噴射弁。 In the fuel injection valve according to claim 5,
A fuel injection valve configured such that the downstream opening of the flow path expansion portion on the downstream side has a smaller radial outward spread angle with respect to the maximum spread angle of the R portion.
JP2017229801A 2017-11-30 2017-11-30 Fuel injection device Pending JP2021028472A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2017229801A JP2021028472A (en) 2017-11-30 2017-11-30 Fuel injection device
PCT/JP2018/041789 WO2019107126A1 (en) 2017-11-30 2018-11-12 Fuel injection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017229801A JP2021028472A (en) 2017-11-30 2017-11-30 Fuel injection device

Publications (1)

Publication Number Publication Date
JP2021028472A true JP2021028472A (en) 2021-02-25

Family

ID=66664448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2017229801A Pending JP2021028472A (en) 2017-11-30 2017-11-30 Fuel injection device

Country Status (2)

Country Link
JP (1) JP2021028472A (en)
WO (1) WO2019107126A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022137969A (en) * 2021-03-09 2022-09-22 日本特殊陶業株式会社 Spark plug

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003120472A (en) * 2001-10-11 2003-04-23 Denso Corp Fuel injection nozzle
JP2008031909A (en) * 2006-07-28 2008-02-14 Ngk Spark Plug Co Ltd Fuel injection nozzle and fuel injection device
JP4610631B2 (en) * 2008-05-01 2011-01-12 三菱電機株式会社 Fuel injection valve
JP2012145048A (en) * 2011-01-12 2012-08-02 Nippon Soken Inc Fuel injection valve
EP2884090B1 (en) * 2013-12-11 2018-02-21 Continental Automotive GmbH Nozzle body and fuel injection valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022137969A (en) * 2021-03-09 2022-09-22 日本特殊陶業株式会社 Spark plug

Also Published As

Publication number Publication date
WO2019107126A1 (en) 2019-06-06

Similar Documents

Publication Publication Date Title
JP6087210B2 (en) Fuel injection valve
EP2067982B1 (en) Fuel injection valve
JP6483574B2 (en) Fuel injection device
EP2574768A1 (en) Fuel injector
WO2017022163A1 (en) Fuel injection device
JP2010084552A (en) Solenoid type fuel injection valve
JP6355765B2 (en) Fuel injection valve
WO2017037973A1 (en) Fuel injection device
JP2010180758A (en) Fuel injection valve
JP2011094632A (en) Solenoid fuel injection valve and method for assembling the same
JP6421730B2 (en) Fuel injection device
CN108779748B (en) Flow rate control device
JP2010281248A (en) Solenoid fuel injection valve
JP2021028472A (en) Fuel injection device
JP2013151915A (en) Fuel injection valve
JP2011117362A (en) Electromagnetic fuel injection valve
JP6380323B2 (en) Fuel injection device
JP6338662B2 (en) Fuel injection valve
JPWO2018155091A1 (en) Fuel injection device
JPWO2019054036A1 (en) Flow control device and method of manufacturing flow control device
JP2020139488A (en) Fuel injection valve
JP2014152695A (en) Fuel injection valve
US20210207566A1 (en) Fuel injection device
JP2015224597A (en) Fuel injection valve
JP2017210933A (en) Fuel injection device

Legal Events

Date Code Title Description
A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20171201