JP2018172972A

JP2018172972A - Mounting structure for fuel injection valve

Info

Publication number: JP2018172972A
Application number: JP2017069547A
Authority: JP
Inventors: 啓太朗中西; Keitaro Nakanishi
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2017-03-31
Filing date: 2017-03-31
Publication date: 2018-11-08
Also published as: CN108691706A

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure for a fuel injection valve capable of suppressing a temperature rise in a nozzle and suppressing increase in cost of manufacture.SOLUTION: A mounting structure for a fuel injection valve comprises: an engine body 4 in which an injector mounting hole 26 communicating to a sub combustion chamber 24 is formed; a cylindrical member 30 which is inserted into the injector mounting hole 26; and an injector 31 inserted into the cylindrical member 30 and including a nozzle 31C which injects a fuel towards the sub combustion chamber 24. The cylindrical member 30 has a polygonal cross section including multiple side parts 30A and multiple corner parts 30B. A cross-sectional contour shape of a distal end closer to the sub combustion chamber 24 is formed smaller than a cross-sectional contour shape of a proximal end opposite to the sub combustion chamber 24. At the side of the proximal end, the corner parts 30B are abutted to an inner peripheral surface of the injector mounting hole 26 in a resilient manner and at the side of the distal end, the side parts 30A are abutted to an outer peripheral surface of the nozzle 31C in a resilient manner.SELECTED DRAWING: Figure 1

Description

本開示は、燃料噴射弁の取付構造に関する。 The present disclosure relates to a fuel injection valve mounting structure.

燃料をシリンダ内に直接噴射する直噴式の燃料噴射弁は、ノズルが燃焼ガスに晒されるために高温になり易い。燃料噴射弁のノズルが高温になると、煤の堆積によるデポジットが生成されて墳孔が塞がれる（狭くなる）ことで燃料噴射量が少なくなる。これを防ぐため、例えば、燃料噴射弁を保持するホルダ内に冷却ジャケットが形成され、冷却水によって燃料噴射弁の先端部が冷却される構成や（例えば、特許文献１）、放熱用の複数の突起が設けられたハウジング拡大部が燃料噴射弁のハウジングに設けられて放熱構造をなす構成（例えば、特許文献２）、燃料噴射弁のボデー部材とシリンダヘッドとの間に、これらよりも高い熱伝導率を有する特殊な形状のガスシールが介装され、ガスシールが噴射ノズル部の先端面からシリンダヘッドへの放熱経路を形成する構成（例えば、特許文献３）等、様々な提案がなされている。 A direct injection type fuel injection valve that directly injects fuel into a cylinder is likely to become hot because the nozzle is exposed to combustion gas. When the temperature of the nozzle of the fuel injection valve becomes high, a deposit is generated due to accumulation of soot and the fistula is closed (narrowed), thereby reducing the fuel injection amount. In order to prevent this, for example, a cooling jacket is formed in a holder that holds the fuel injection valve, and the tip of the fuel injection valve is cooled by cooling water (for example, Patent Document 1), or a plurality of heat dissipation valves. A structure in which the housing enlarged portion provided with the protrusion is provided in the housing of the fuel injection valve to form a heat dissipation structure (for example, Patent Document 2), and heat higher than these between the body member of the fuel injection valve and the cylinder head Various proposals have been made such as a configuration in which a gas seal having a special shape having conductivity is interposed, and the gas seal forms a heat radiation path from the tip surface of the injection nozzle portion to the cylinder head (for example, Patent Document 3). Yes.

これらの他にも、燃料噴射弁のノズルを収容するシリンダヘッドの収容孔に、スリーブボディと上側カラーとからなる防熱スリーブが設けられ、スリーブボディが下端において折り返されて２層に形成され、内側の層が弾性的にノズルに密に接触し、外側の層及びそれよりも上側の中空円筒状の部分がシリンダヘッドの収容孔に弾性的に密に接触することで、良好な熱結合を得る構成が提案されている。 In addition to these, a heat-insulating sleeve comprising a sleeve body and an upper collar is provided in the accommodation hole of the cylinder head that accommodates the nozzle of the fuel injection valve, and the sleeve body is folded back at the lower end to be formed in two layers. The outer layer and the hollow cylindrical portion on the upper side are in close contact with the receiving hole of the cylinder head elastically and in close contact with the nozzle to obtain a good thermal coupling. A configuration is proposed.

特許第４５５９５０３号公報Japanese Patent No. 4559503 特開２０１５−２２２０３６号公報Japanese Patent Laid-Open No. 2015-2222036 特許第４０３３６８４号公報Japanese Patent No. 4033684 特表２００１−５０８５２０号公報Special table 2001-508520 gazette

しかしながら、特許文献１〜３の構成では、シリンダヘッドやホルダ、放熱部材の構造が複雑になるか、特殊な形状のガスシール部材等の特殊部材が必要になる。一方、特許文献４の構造では、防熱スリーブをノズルやシリンダヘッドの収容孔に弾性的に密に接触させるために精密な加工が必要になる。そのため、いずれの構成においても製造コストが増大する。 However, in the configurations of Patent Documents 1 to 3, the structure of the cylinder head, the holder, and the heat radiating member is complicated, or a special member such as a specially shaped gas seal member is required. On the other hand, in the structure of Patent Document 4, precise processing is required to bring the heat-insulating sleeve into elastic close contact with the nozzle or cylinder head accommodation hole. Therefore, the manufacturing cost increases in any configuration.

本発明は、このような背景に鑑み、ノズルが高温になることを抑制でき、且つ製造コストの増大を抑制できる燃料噴射弁の取付構造を提供することを課題とする。 In view of such a background, an object of the present invention is to provide a fuel injection valve mounting structure capable of suppressing the nozzle from becoming high temperature and suppressing an increase in manufacturing cost.

このような課題を解決するために、本発明のある実施形態に係る燃料噴射弁取付構造は、燃焼室（１２、２４）に連通する取付孔（２６）が形成された内燃機関本体（４）と、前記取付孔に挿入された筒状部材（３０、４０、５０、６０、７０、８０、９０）と、前記筒状部材に挿入され、燃料を前記燃焼室に向けて噴射するノズル（３１Ｃ）を有する燃料噴射弁（３０）とを備え、前記筒状部材は、複数の辺部（３０Ａ、４０Ａ、５０Ａ、６０Ａ、７０Ａ、８０Ａ、９０Ａ）と複数の角部（３０Ｂ、４０Ｂ、５０Ｂ、６０Ｂ、７０Ｂ、８０Ｂ、９０Ｂ）とを有する多角形断面を有し、且つ前記燃焼室側の先端の断面輪郭形状を前記燃焼室と相反する側の基端の断面輪郭形状よりも小さく形成されており、前記基端側において前記角部を前記取付孔の内周面に弾発的に当接させ、前記先端側において前記辺部を前記ノズルの外周面に弾発的に当接させることを特徴とする。 In order to solve such a problem, a fuel injection valve mounting structure according to an embodiment of the present invention has an internal combustion engine body (4) in which a mounting hole (26) communicating with a combustion chamber (12, 24) is formed. A cylindrical member (30, 40, 50, 60, 70, 80, 90) inserted into the mounting hole, and a nozzle (31C) that is inserted into the cylindrical member and injects fuel toward the combustion chamber. ) Having a fuel injection valve (30) having a plurality of side portions (30A, 40A, 50A, 60A, 70A, 80A, 90A) and a plurality of corner portions (30B, 40B, 50B, 60B, 70B, 80B, 90B), and the cross-sectional contour shape of the tip on the combustion chamber side is smaller than the cross-sectional contour shape of the base end on the side opposite to the combustion chamber. And at the base end side, the corner portion is Resiliently brought into contact with the inner circumferential surface of the biasing bore, characterized thereby resiliently abutting the edge portion on the outer peripheral surface of the nozzle at the distal end side.

この構成によれば、筒状部材は、多角形断面を有するために弾性変形し易く、精密に加工されていなくても、基端側において角部を取付孔の内周面に弾発的に当接させ、先端側において辺部を燃料弁の外周面に弾発的に当接させることができる。そのため、製造コストの増大を抑制できる。 According to this configuration, since the cylindrical member has a polygonal cross section, it is easily elastically deformed, and even if it is not precisely processed, the corner portion is elastically formed on the inner peripheral surface of the mounting hole on the base end side. The side part can be elastically brought into contact with the outer peripheral surface of the fuel valve on the tip side. Therefore, an increase in manufacturing cost can be suppressed.

また、上記構成において、前記筒状部材（３０、４０、５０、６０、７０、８０、９０）は、前記基端において前記ノズル（３１Ｃ）の外周面に当接していないとよい。 Moreover, the said structure WHEREIN: The said cylindrical member (30, 40, 50, 60, 70, 80, 90) is good not to contact | abut on the outer peripheral surface of the said nozzle (31C) in the said base end.

この構成によれば、燃料噴射弁のノズルを容易に筒状部材に挿入することができる。 According to this configuration, the nozzle of the fuel injection valve can be easily inserted into the cylindrical member.

また、上記構成において、前記筒状部材（３０）は、板金加工品であり、軸方向に沿って形成されたスリット（３０Ｃ）を備えるとよい。 Moreover, the said structure WHEREIN: The said cylindrical member (30) is a sheet metal processed goods, It is good to provide the slit (30C) formed along the axial direction.

この構成によれば、筒状部材の加工が容易であり、製造コストを低減できる。 According to this configuration, the cylindrical member can be easily processed, and the manufacturing cost can be reduced.

また、上記構成において、前記筒状部材（５０）の少なくとも前記基端は、前記取付孔（２６）に挿入される前の状態において、前記辺部（５０Ａ）が内方に凸の湾曲形状をなす断面形状を有しているとよい。 In the above configuration, at least the base end of the cylindrical member (50) has a curved shape in which the side portion (50A) is inwardly convex before being inserted into the mounting hole (26). It is preferable to have a cross-sectional shape.

この構成によれば、ノズルを筒状部材内に挿入する際に、左右の角部から圧縮力を受ける辺部が径内方向に湾曲し易いため、小さな荷重で筒状部材を取付孔に挿入できる。 According to this configuration, when the nozzle is inserted into the cylindrical member, the side receiving the compressive force from the left and right corners is easily bent in the radially inward direction, so the cylindrical member is inserted into the mounting hole with a small load. it can.

また、上記構成において、前記筒状部材（６０）の少なくとも前記先端は、前記取付孔（２６）に挿入される前の状態において、前記辺部（６０Ａ）が外方に凸の湾曲形状をなす断面形状を有しているとよい。 Further, in the above configuration, at least the tip of the cylindrical member (60) has a curved shape with the side portion (60A) protruding outward in a state before being inserted into the mounting hole (26). It is good to have a cross-sectional shape.

この構成によれば、筒状部材の辺部と燃料噴射弁のノズルの外周面との接触面積を大きくすることができる。或いは、同じ接触面積を確保する際には、燃料噴射弁のノズルを筒状部材に圧入する際に要する荷重を小さくすることができる。 According to this structure, the contact area of the side part of a cylindrical member and the outer peripheral surface of the nozzle of a fuel injection valve can be enlarged. Or when ensuring the same contact area, the load required when press-fitting the nozzle of a fuel injection valve into a cylindrical member can be made small.

また、上記構成において、前記筒状部材（７０）は、軸方向の中間部において閉断面形状を有し、且つ前記取付孔（２６）に挿入される前の状態において、前記先端側から前記基端側に向けて断面が拡大するテーパ形状をなしており、前記筒状部材の前記基端側には、前記基端から軸方向に沿って前記辺部に形成された複数の基端側スリット（７０Ｄ）が形成されているとよい。 Further, in the above configuration, the cylindrical member (70) has a closed cross-sectional shape at an intermediate portion in the axial direction, and the base member (70) from the distal end side in a state before being inserted into the mounting hole (26). A plurality of proximal slits formed in the side portion along the axial direction from the proximal end on the proximal end side of the cylindrical member, and having a tapered shape with a cross section expanding toward the end side (70D) may be formed.

この構成によれば、筒状部材の基端側の角部が径内方向に弾性変形し易くなる。そのため、小さな荷重で筒状部材を内燃機関本体の取付孔に圧入できる。 According to this configuration, the corner portion on the proximal end side of the cylindrical member is easily elastically deformed in the radially inward direction. Therefore, the cylindrical member can be press-fitted into the mounting hole of the internal combustion engine body with a small load.

また、上記構成において、前記筒状部材（７０）は、軸方向の中間部において閉断面形状を有し、且つ前記取付孔（２６）に挿入される前の状態において、前記先端側から前記基端側に向けて断面が拡大するテーパ形状をなしており、前記筒状部材の前記先端側には、前記先端から軸方向に沿って前記角部に形成された複数の先端側スリット（７０Ｅ）が形成されているとよい。 Further, in the above configuration, the cylindrical member (70) has a closed cross-sectional shape at an intermediate portion in the axial direction, and the base member (70) from the distal end side in a state before being inserted into the mounting hole (26). A tapered shape whose cross section expands toward the end side is formed, and a plurality of front end side slits (70E) formed in the corner portion along the axial direction from the front end are formed on the front end side of the cylindrical member. Is good to be formed.

この構成によれば、筒状部材の先端側の辺部が径外方向に弾性変形し易くなる。そのため、小さな荷重で燃料噴射弁のノズルを筒状部材に圧入できる。 According to this configuration, the side portion on the distal end side of the cylindrical member is easily elastically deformed in the radially outward direction. Therefore, the nozzle of the fuel injection valve can be pressed into the cylindrical member with a small load.

また、上記構成において、前記筒状部材（８０、９０）は、前記先端側に形成され、軸方向に所定の長さに亘って前記辺部が前記ノズル（３１Ｃ）の外周面に弾発的に当接する第１ストレート形状部（８０Ｇ、９０Ｇ）を有するとよい。 Further, in the above configuration, the cylindrical members (80, 90) are formed on the tip side, and the side portions are elastically formed on the outer peripheral surface of the nozzle (31C) over a predetermined length in the axial direction. It is good to have the 1st straight shape part (80G, 90G) which contacts.

この構成によれば、筒状部材の先端側がノズルの外周面に当接する面積が大きくなり、ノズルの熱が効率的に筒状部材に伝達される。そのため、ノズルが高温になることを一層抑制できる。 According to this structure, the area where the front end side of the cylindrical member abuts on the outer peripheral surface of the nozzle is increased, and the heat of the nozzle is efficiently transmitted to the cylindrical member. Therefore, it can suppress further that a nozzle becomes high temperature.

また、上記構成において、前記筒状部材（９０）は、前記基端側に形成され、軸方向に所定の長さに亘って前記角部が前記取付孔（２６）の内周面に弾発的に当接する第２ストレート形状部（９０Ｈ）を有するとよい。 In the above configuration, the cylindrical member (90) is formed on the base end side, and the corner portion is elastically formed on the inner peripheral surface of the mounting hole (26) over a predetermined length in the axial direction. It is good to have the 2nd straight shape part (90H) which touches.

この構成によれば、筒状部材の基端側が取付孔の内周面に当接する面積が大きくなり、ノズルから伝わった熱が筒状部材から効率的に内燃機関本体に伝達される。そのため、筒状部材及びノズルが高温になることを一層抑制できる。 According to this configuration, the area where the proximal end side of the cylindrical member abuts on the inner peripheral surface of the mounting hole is increased, and the heat transmitted from the nozzle is efficiently transmitted from the cylindrical member to the internal combustion engine body. Therefore, it can suppress further that a cylindrical member and a nozzle become high temperature.

このように本発明によれば、燃料噴射弁が高温になることを抑制でき、且つ製造コストの増大を抑制できる燃料噴射弁の取付構造を提供することができる。 Thus, according to the present invention, it is possible to provide a fuel injection valve mounting structure capable of suppressing the fuel injection valve from becoming high temperature and suppressing an increase in manufacturing cost.

第１実施形態に係る内燃機関の要部断面図Sectional drawing of the principal part of the internal combustion engine which concerns on 1st Embodiment. 図１に示される筒状部材の取付前状態を示す斜視図The perspective view which shows the state before attachment of the cylindrical member shown by FIG. 図１中のIII−III断面図III-III sectional view in FIG. 図１中のIV−IV断面図IV-IV sectional view in Fig. 1 第２実施形態に係る筒状部材の取付前状態を示す斜視図The perspective view which shows the state before attachment of the cylindrical member which concerns on 2nd Embodiment. 第３実施形態に係る筒状部材の、図３の要部に相当する先端側の拡大断面図The expanded sectional view of the front end side equivalent to the principal part of Drawing 3 of the cylindrical member concerning a 3rd embodiment. 第４実施形態に係る筒状部材の、図４の要部に相当する基端側の拡大断面図The expanded sectional view of the base end side equivalent to the principal part of Drawing 4 of the cylindrical member concerning a 4th embodiment 第５実施形態に係る筒状部材の取付前状態を示す斜視図The perspective view which shows the state before attachment of the cylindrical member which concerns on 5th Embodiment. 図８に示される筒状部材の、図３に対応する基端側の断面図Sectional drawing of the base end side corresponding to FIG. 3 of the cylindrical member shown by FIG. 図８に示される筒状部材の、図４に対応する先端側の断面図Sectional drawing of the front end side corresponding to FIG. 4 of the cylindrical member shown by FIG. 第６実施形態に係る筒状部材の取付前状態を示す概略側面図The schematic side view which shows the state before attachment of the cylindrical member which concerns on 6th Embodiment 第７実施形態に係る筒状部材の取付前状態を示す概略側面図The schematic side view which shows the state before attachment of the cylindrical member which concerns on 7th Embodiment

以下、図面を参照して、本発明を４バルブ、４ストロークのガソリンエンジン（以下、内燃機関１という）に適用した実施形態について詳細に説明する。 Hereinafter, an embodiment in which the present invention is applied to a 4-valve, 4-stroke gasoline engine (hereinafter referred to as an internal combustion engine 1) will be described in detail with reference to the drawings.

≪第１実施形態≫
図１〜図４を参照して、まず第１実施形態について説明する。図１は、第１実施形態に係る副室式内燃機関の模式的断面図である。図１に示されるように、内燃機関１は、シリンダブロック２と、シリンダブロック２の上端面に締結されたシリンダヘッド３とを含むエンジン本体４を有する。シリンダブロック２には、シリンダブロック２の上端面に開口する断面円形のシリンダ５が形成されている。シリンダ５の軸線をシリンダ軸線Ａとする。シリンダヘッド３の下端面においてシリンダ５の上端と対向する部分は、上方に向けて凹み、シリンダ５の上端をなす燃焼室壁面７を形成している。燃焼室壁面７は、いわゆるペントルーフ形に形成されている。 << First Embodiment >>
First, a first embodiment will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view of a sub-chamber internal combustion engine according to the first embodiment. As shown in FIG. 1, the internal combustion engine 1 has an engine body 4 including a cylinder block 2 and a cylinder head 3 fastened to the upper end surface of the cylinder block 2. The cylinder block 2 is formed with a cylinder 5 having a circular cross section that opens to the upper end surface of the cylinder block 2. Let the axis of the cylinder 5 be the cylinder axis A. A portion of the lower end surface of the cylinder head 3 that faces the upper end of the cylinder 5 is recessed upward to form a combustion chamber wall surface 7 that forms the upper end of the cylinder 5. The combustion chamber wall surface 7 is formed in a so-called pent roof shape.

シリンダ５には、ピストン１１がシリンダ軸線Ａに沿って往復動可能に受容されている。燃焼室壁面７と、ピストン１１の冠面とは協働して主燃焼室１２を形成する。ピストン１１は、コンロッド（不図示）を介してクランクシャフト（不図示）に接続されている。クランクシャフトの延在方向（紙面を貫通する方向）をクランク軸線方向とする。 A piston 11 is received in the cylinder 5 so as to reciprocate along the cylinder axis A. The combustion chamber wall surface 7 and the crown surface of the piston 11 cooperate to form a main combustion chamber 12. The piston 11 is connected to a crankshaft (not shown) via a connecting rod (not shown). The extending direction of the crankshaft (the direction penetrating the paper surface) is defined as the crank axis direction.

燃焼室壁面７には、２つの吸気ポート１５と、２つの排気ポート１６とが開口している。クランク軸線及びシリンダ軸線Ａに直交する方向を吸排気方向とすると、燃焼室壁面７において、吸排気方向の一側である吸気側に２つの吸気ポート１５が配置され、他側である排気側に２つの排気ポート１６が配置されている。吸気ポート１５及び排気ポート１６の燃焼室壁面７側の開口端は、ポペットバルブである吸気バルブ１７及び排気バルブ１８によって開閉される。 Two intake ports 15 and two exhaust ports 16 are opened in the combustion chamber wall surface 7. Assuming that the direction orthogonal to the crank axis and the cylinder axis A is the intake / exhaust direction, two intake ports 15 are arranged on the intake side, which is one side of the intake / exhaust direction, on the combustion chamber wall surface 7, and Two exhaust ports 16 are arranged. Open ends of the intake port 15 and the exhaust port 16 on the combustion chamber wall 7 side are opened and closed by an intake valve 17 and an exhaust valve 18 which are poppet valves.

燃焼室壁面７の中央には、上方に向けて凹んだ受容孔２０が凹設されている。受容孔２０は、シリンダ軸線Ａと同軸に形成された円孔として形成されている。受容孔２０の底面は、円孔の上端面によって形成され、シリンダ軸線Ａに直交する連続した平面に形成されている。 A receiving hole 20 that is recessed upward is provided in the center of the combustion chamber wall surface 7. The receiving hole 20 is formed as a circular hole formed coaxially with the cylinder axis A. The bottom surface of the receiving hole 20 is formed by the upper end surface of the circular hole, and is formed in a continuous plane orthogonal to the cylinder axis A.

受容孔２０には隔壁部材２３が受容されている。隔壁部材２３は、軸線が上下に延びた断面円形の筒部と、筒部の下端を閉塞する下壁部とを有し、上方に向けて開口して副燃焼室２４の一部を形成する凹所を形成しており、受容孔２０と協働して副燃焼室２４を形成する。 A partition wall member 23 is received in the receiving hole 20. The partition wall member 23 has a cylindrical portion with a circular cross section whose axis extends vertically, and a lower wall portion that closes the lower end of the cylindrical portion, and opens upward to form a part of the auxiliary combustion chamber 24. A recess is formed, and the auxiliary combustion chamber 24 is formed in cooperation with the receiving hole 20.

隔壁部材２３の下壁部は、下方に向けて凸となる略半球形に形成され、燃焼室壁面７から下方に突出している。隔壁部材２３の下壁部には、厚み方向に貫通し、主燃焼室１２と副燃焼室２４とを連通する複数の連通孔２３Ａが形成されている。主燃焼室１２と副燃焼室２４とは、複数の連通孔２３Ａのみによって互いに連通し、流体の流通が可能になっている。主燃焼室１２と副燃焼室２４とは、連通孔２３Ａを除く他の部分においては互いに隔てられ、流体の流通が遮断されている。 The lower wall portion of the partition member 23 is formed in a substantially hemispherical shape that protrudes downward, and protrudes downward from the combustion chamber wall surface 7. A plurality of communication holes 23 A that penetrates in the thickness direction and communicates the main combustion chamber 12 and the sub-combustion chamber 24 are formed in the lower wall portion of the partition wall member 23. The main combustion chamber 12 and the sub-combustion chamber 24 communicate with each other only through the plurality of communication holes 23A, and fluid can be circulated. The main combustion chamber 12 and the sub-combustion chamber 24 are separated from each other in portions other than the communication hole 23A, and the fluid flow is blocked.

シリンダヘッド３には、受容孔２０の底面の中央から上方に延びる接続通路２５と、接続通路２５に接続したインジェクタ取付孔２６及び点火プラグ取付孔２７とが形成されている。接続通路２５は、下端において受容孔２０と接続し、副燃焼室２４の一部を形成する。インジェクタ取付孔２６及び点火プラグ取付孔２７は、上端においてシリンダヘッド３の上面に開口しており、下端において接続通路２５の上端に接続している。インジェクタ取付孔２６は、クランク軸線と直交する平面上に配置され、上方に向けて吸気側に傾斜している。シリンダ軸線Ａに沿った方向から見てインジェクタ取付孔２６は、隣り合う吸気ポート１５の間に配置されている。点火プラグ取付孔２７は、クランク軸線と直交する平面上に配置され、上方に向けて排気側に傾斜している。シリンダ軸線Ａに沿った方向から見てインジェクタ取付孔２６は、隣り合う排気ポート１６の間に配置されている。 In the cylinder head 3, a connection passage 25 extending upward from the center of the bottom surface of the receiving hole 20, an injector attachment hole 26 and a spark plug attachment hole 27 connected to the connection passage 25 are formed. The connection passage 25 is connected to the receiving hole 20 at the lower end and forms a part of the auxiliary combustion chamber 24. The injector mounting hole 26 and the spark plug mounting hole 27 open to the upper surface of the cylinder head 3 at the upper end, and are connected to the upper end of the connection passage 25 at the lower end. The injector mounting hole 26 is disposed on a plane orthogonal to the crank axis, and is inclined upward toward the intake side. The injector mounting hole 26 is disposed between the adjacent intake ports 15 when viewed from the direction along the cylinder axis A. The spark plug mounting hole 27 is disposed on a plane orthogonal to the crank axis, and is inclined upward toward the exhaust side. When viewed from the direction along the cylinder axis A, the injector mounting hole 26 is disposed between the adjacent exhaust ports 16.

インジェクタ取付孔２６は、軸方向における副燃焼室２４から遠い側の上端に最も大径に形成された円形断面の大径部２６Ａと、軸方向の中間部に大径部２６Ａよりも小さく形成され、円錐台形状部２６Ｂを介して大径部２６Ａの下端に連続する円形断面の中径部２６Ｃと、軸方向における副燃焼室２４側の下端に最も小径に形成され、中径部２６Ｃの下端に連続する円形断面の小径部２６Ｄとを有している。大径部２６Ａ、中径部２６Ｃ及び小径部２６Ｄは、それぞれ一定断面寸法を有する円形孔であり、互いに同軸に配置されている。従って、中径部２６Ｃの下端には上方を向く円環状片面２６Ｅが形成されている。シリンダヘッド３の上面における大径部２６Ａの周辺部分は、インジェクタ取付孔２６の軸線に直交する平面になっている。 The injector mounting hole 26 is formed with a large-diameter portion 26A having a circular cross section having the largest diameter at the upper end on the side far from the auxiliary combustion chamber 24 in the axial direction, and smaller than the large-diameter portion 26A in the intermediate portion in the axial direction. The intermediate diameter portion 26C having a circular cross section that continues to the lower end of the large diameter portion 26A via the truncated cone shape portion 26B, and the lower end on the side of the auxiliary combustion chamber 24 in the axial direction are formed with the smallest diameter, and the lower end of the medium diameter portion 26C. And a small-diameter portion 26D having a circular cross-section that is continuous with the cross-section. The large-diameter portion 26A, the medium-diameter portion 26C, and the small-diameter portion 26D are circular holes each having a constant cross-sectional dimension, and are arranged coaxially with each other. Accordingly, an annular one side 26E facing upward is formed at the lower end of the medium diameter portion 26C. A peripheral portion of the large diameter portion 26 A on the upper surface of the cylinder head 3 is a plane orthogonal to the axis of the injector mounting hole 26.

インジェクタ取付孔２６の中径部２６Ｃには筒状部材３０が挿入され、インジェクタ取付孔２６及び筒状部材３０には、液体燃料又は気体燃料を噴射する燃料噴射弁であるインジェクタ３１が挿入されている。インジェクタ３１は、本体部３１Ａと、本体部３１Ａの下端から突出する、本体部３１Ａよりも小径のノズル支持部３１Ｂと、ノズル支持部３１Ｂの下端から突出する、ノズル支持部３１Ｂよりも小径のノズル３１Ｃとを有している。ノズル支持部３１Ｂ及びノズル３１Ｃは、本体部３１Ａの下面に直交する向きに同軸に形成にされており、ノズル３１Ｃは、燃料を噴射する噴孔を先端に備えている。本体部３１Ａの下面におけるノズル支持部３１Ｂの周辺部分は、シリンダヘッド３の上面に当接する円環状の当接面となる。本体部３１Ａがシリンダヘッド３の上面に当接した取付状態において、ノズル３１Ｃの先端は接続通路２５に配置される。ノズル３１Ｃの先端は、副燃焼室２４の燃焼ガスに晒されるため高温になり易い。 A cylindrical member 30 is inserted into the middle diameter portion 26C of the injector mounting hole 26, and an injector 31 that is a fuel injection valve for injecting liquid fuel or gaseous fuel is inserted into the injector mounting hole 26 and the cylindrical member 30. Yes. The injector 31 includes a main body portion 31A, a nozzle support portion 31B having a smaller diameter than the main body portion 31A, protruding from the lower end of the main body portion 31A, and a nozzle having a smaller diameter than the nozzle support portion 31B protruding from the lower end of the nozzle support portion 31B. 31C. The nozzle support portion 31B and the nozzle 31C are coaxially formed in a direction orthogonal to the lower surface of the main body portion 31A, and the nozzle 31C has a nozzle hole for injecting fuel at the tip. A peripheral portion of the nozzle support portion 31 B on the lower surface of the main body portion 31 A serves as an annular contact surface that contacts the upper surface of the cylinder head 3. When the main body 31 A is in contact with the upper surface of the cylinder head 3, the tip of the nozzle 31 C is disposed in the connection passage 25. Since the tip of the nozzle 31 C is exposed to the combustion gas in the sub-combustion chamber 24, it tends to be hot.

インジェクタ３１は、シリンダヘッド３の上面側からインジェクタ取付孔２６に挿入されてシリンダヘッド３に取り付けられる。取付手順は、筒状部材３０がインジェクタ取付孔２６に挿入された後に、インジェクタ３１が筒状部材３０に挿入されてもよく、インジェクタ３１が筒状部材３０に挿入された後に、インジェクタ３１と共に筒状部材３０がインジェクタ取付孔２６に挿入されてもよい。 The injector 31 is inserted into the injector mounting hole 26 from the upper surface side of the cylinder head 3 and attached to the cylinder head 3. The attachment procedure may be such that after the tubular member 30 is inserted into the injector mounting hole 26, the injector 31 may be inserted into the tubular member 30, and after the injector 31 is inserted into the tubular member 30, the cylinder together with the injector 31 is tubed. The shaped member 30 may be inserted into the injector mounting hole 26.

ノズル支持部３１Ｂはインジェクタ取付孔２６の大径部２６Ａよりも若干小さく形成されおり、大径部２６Ａに配置される。ノズル支持部３１Ｂの外周面には大径部２６Ａの内周面に当接する円環状のシール部材３２が設けられている。ノズル３１Ｃはインジェクタ取付孔２６の小径部２６Ｄよりも若干小さく形成されており、中径部２６Ｃ及び小径部２６Ｄに配置される。ノズル３１Ｃの小径部２６Ｄに配置される部分の外周面には小径部２６Ｄの内周面に当接する２つのシール部材３３が設けられている。これら３つのシール部材３２、３３によって副燃焼室２４の気密性が確保される。 The nozzle support portion 31B is formed slightly smaller than the large diameter portion 26A of the injector mounting hole 26, and is disposed in the large diameter portion 26A. An annular seal member 32 is provided on the outer peripheral surface of the nozzle support portion 31B so as to contact the inner peripheral surface of the large diameter portion 26A. The nozzle 31C is formed slightly smaller than the small diameter portion 26D of the injector mounting hole 26, and is disposed in the medium diameter portion 26C and the small diameter portion 26D. Two seal members 33 that contact the inner peripheral surface of the small diameter portion 26D are provided on the outer peripheral surface of the portion disposed in the small diameter portion 26D of the nozzle 31C. These three sealing members 32 and 33 ensure the airtightness of the auxiliary combustion chamber 24.

筒状部材３０は、インジェクタ取付孔２６の中径部２６Ｃから大径部２６Ａにかけて配置されている。或いは、筒状部材３０は、インジェクタ取付孔２６の中径部２６Ｃから円錐台形状部２６Ｂにかけて配置されてもよい。筒状部材３０の下端は、インジェクタ取付孔２６の円環状片面２６Ｅに当接し、或いは対向している。筒状部材３０の上端は、インジェクタ取付孔２６の大径部２６Ａに配置されたノズル支持部３１Ｂの下面に当接し、或いは対向している。即ち、ノズル支持部３１Ｂの軸方向長さと筒状部材３０の軸方向長さとの和は、インジェクタ取付孔２６の上端から円環状片面２６Ｅまでの軸方向長さ以下とされている。 The cylindrical member 30 is disposed from the middle diameter portion 26C to the large diameter portion 26A of the injector mounting hole 26. Alternatively, the cylindrical member 30 may be arranged from the middle diameter portion 26C of the injector mounting hole 26 to the truncated cone shape portion 26B. The lower end of the cylindrical member 30 is in contact with or opposed to the annular one surface 26E of the injector mounting hole 26. The upper end of the cylindrical member 30 abuts on or faces the lower surface of the nozzle support portion 31B disposed in the large diameter portion 26A of the injector mounting hole 26. That is, the sum of the axial length of the nozzle support portion 31B and the axial length of the cylindrical member 30 is set to be equal to or less than the axial length from the upper end of the injector mounting hole 26 to the annular one surface 26E.

点火プラグ取付孔２７には、スパークプラグである点火プラグ３４が挿入されている。点火プラグ３４は、軸状に延びる本体部３４Ａと、本体部３４Ａの先端中央に設けられた中心電極３４Ｂと、本体部３４Ａの先端周縁から突出した接地電極３４Ｃとを有する。本体部３４Ａの外周面には、雄ねじが形成されており、点火プラグ取付孔２７の下部に形成された雌ねじに螺合している。中心電極３４Ｂと接地電極３４Ｃの先端部との間は、発火部となり、点火時に中心電極３４Ｂに電圧が印加されることによって火花が発生する。取付状態において、中心電極３４Ｂ及び接地電極３４Ｃは接続通路２５に配置される。点火プラグ取付孔２７にはシリンダヘッド３の上面に向く環状肩面が形成され、点火プラグ３４には副燃焼室２４に向き、点火プラグ取付孔２７の環状肩面に対向する環状肩面が形成されている。両環状肩面間にはシール部材３５が配置されており、これにより副燃焼室２４の気密性が確保されている。 A spark plug 34 that is a spark plug is inserted into the spark plug mounting hole 27. The spark plug 34 has a main body portion 34A that extends in an axial shape, a center electrode 34B that is provided at the center of the tip of the main body portion 34A, and a ground electrode 34C that protrudes from the periphery of the tip of the main body portion 34A. A male screw is formed on the outer peripheral surface of the main body portion 34 A and is screwed into a female screw formed in the lower part of the spark plug mounting hole 27. Between the center electrode 34B and the tip of the ground electrode 34C is an ignition part, and a spark is generated by applying a voltage to the center electrode 34B at the time of ignition. In the attached state, the center electrode 34 B and the ground electrode 34 C are disposed in the connection passage 25. An annular shoulder surface facing the upper surface of the cylinder head 3 is formed in the spark plug mounting hole 27, and an annular shoulder surface facing the secondary combustion chamber 24 and facing the annular shoulder surface of the spark plug mounting hole 27 is formed in the ignition plug 34. Has been. A seal member 35 is disposed between the two annular shoulder surfaces, thereby ensuring the airtightness of the auxiliary combustion chamber 24.

シリンダヘッド３には、冷却水が流通するヘッド側ウォータジャケット３６が形成されている。ヘッド側ウォータジャケット３６は、主に燃焼室壁面７及び排気ポート１６の周囲に形成されており、副燃焼室２４の上方及び吸気側に配置されたインジェクタ取付孔２６の周辺にも形成されている。ヘッド側ウォータジャケット３６は、シリンダヘッド３の下端面に開口したヘッド側冷却水入口３６Ａと、シリンダヘッド３のクランク軸線方向における一側の端面に開口したヘッド側冷却水出口（不図示）とを有する。 The cylinder head 3 is formed with a head-side water jacket 36 through which cooling water flows. The head-side water jacket 36 is mainly formed around the combustion chamber wall surface 7 and the exhaust port 16, and is also formed around the injector mounting hole 26 disposed above the auxiliary combustion chamber 24 and on the intake side. . The head-side water jacket 36 includes a head-side cooling water inlet 36A opened at the lower end surface of the cylinder head 3, and a head-side cooling water outlet (not shown) opened at one end surface in the crank axis direction of the cylinder head 3. Have.

シリンダブロック２のシリンダ５の周囲には、ブロック側ウォータジャケット３７が形成されている。ブロック側ウォータジャケット３７は、シリンダブロック２の側面に開口しブロック側冷却水入口（不図示）と、シリンダブロック２の上端面に開口したブロック側冷却水出口３７Ａとを有する。 A block-side water jacket 37 is formed around the cylinder 5 of the cylinder block 2. The block-side water jacket 37 has a block-side cooling water inlet (not shown) that opens to the side surface of the cylinder block 2 and a block-side cooling water outlet 37 A that opens to the upper end surface of the cylinder block 2.

ヘッド側冷却水入口３６Ａとブロック側冷却水出口３７Ａとは互いに接続され、ブロック側冷却水入口とヘッド側冷却水出口とはウォータポンプを備えた冷却水通路に接続されている。冷却水は、ウォータポンプによって、ブロック側ウォータジャケット３７、ヘッド側ウォータジャケット３６を順に通過して循環する。 The head side cooling water inlet 36A and the block side cooling water outlet 37A are connected to each other, and the block side cooling water inlet and the head side cooling water outlet are connected to a cooling water passage provided with a water pump. The cooling water circulates through the block-side water jacket 37 and the head-side water jacket 36 in this order by a water pump.

図２は、図１に示される筒状部材３０の、インジェクタ取付孔２６への取付前状態を示す斜視図である。図２に示されるように、筒状部材３０は、熱伝導率の高い材料からなる鋼板を正多角形断面（図示例では、正六角形断面）の筒状に曲げ加工してなる板金加工品であり、断面における多角形の各辺によって平坦壁状に形成された複数（図示例では６つ）の辺部３０Ａと、断面における多角形の各頂点によって稜線状に形成された複数（図示例では６つ）の角部３０Ｂとを有している。鋼板の周方向の両端部間にはギャップが形成されている。言い換えれば、筒状部材３０は、軸方向に沿って縦断するように形成された１本のスリット３０Ｃを備えた開断面形状とされている。スリット３０Ｃは、辺部３０Ａの幅（辺の長さ）よりも小さな幅を有し、１つの辺部３０Ａの幅方向の中央に配置されている。これにより、角部３０Ｂ及び辺部３０Ａの数は、減少せずに６つに保たれている。筒状部材３０は、主燃焼室１２及び副燃焼室２４側に配置される先端（図２の下端）の断面輪郭形状がシリンダヘッド３の上面側に配置される基端（図２の上端）の断面輪郭形状よりも小さく、先端側から基端側に向けて断面が拡大するテーパ形状（六角錐台形）とされている。 FIG. 2 is a perspective view showing a state before the tubular member 30 shown in FIG. 1 is attached to the injector attachment hole 26. As shown in FIG. 2, the tubular member 30 is a processed sheet metal product obtained by bending a steel plate made of a material having high thermal conductivity into a regular polygonal cross section (in the illustrated example, a regular hexagonal cross section). Yes, a plurality (six in the illustrated example) of side portions 30A formed by a polygonal side in the cross section and a plurality of (in the illustrated example) a ridgeline formed by each vertex of the polygon in the cross section 6) corner portions 30B. A gap is formed between both ends in the circumferential direction of the steel plate. In other words, the cylindrical member 30 has an open cross-sectional shape provided with a single slit 30C formed so as to be longitudinally cut along the axial direction. The slit 30C has a width smaller than the width of the side portion 30A (side length), and is arranged at the center in the width direction of one side portion 30A. Thereby, the number of the corner | angular part 30B and the side part 30A is maintained at six, without reducing. The cylindrical member 30 has a proximal end (upper end in FIG. 2) in which a cross-sectional contour shape of a distal end (lower end in FIG. 2) disposed on the main combustion chamber 12 and sub-combustion chamber 24 side is disposed on the upper surface side of the cylinder head 3. It is made into the taper shape (hexagon frustum shape) which is smaller than the cross-sectional outline shape of this, and a cross section expands toward the base end side from the front end side.

図３は、図１中のIII−III線に沿って示す、取付状態における筒状部材３０の基端側の断面図である。筒状部材３０の基端側は、インジェクタ取付孔２６への挿入前の状態において、インジェクタ取付孔２６の中径部２６Ｃよりも大きな外接円を形成する外輪郭及び、インジェクタ３１のノズル３１Ｃよりも大きな内接円を形成する内輪郭を有している。従って、図３に示されるように、筒状部材３０の基端側はインジェクタ取付孔２６に挿入されると外輪郭の最大断面寸法が縮小するように弾性変形し、６つの角部３０Ｂがインジェクタ取付孔２６の中径部２６Ｃの内周面に弾発的に当接する。筒状部材３０の基端側の弾性変形は、スリット３０Ｃを減幅させる、筒状部材３０の周方向の全体に亘る曲げ変形によって主に行われ、角部３０Ｂの曲率半径を大きくする角部３０Ｂの曲げ変形によっても行われる。 FIG. 3 is a cross-sectional view of the proximal side of the tubular member 30 in the attached state, taken along line III-III in FIG. The proximal end side of the cylindrical member 30 is more than the outer contour that forms a circumscribed circle larger than the medium diameter portion 26C of the injector mounting hole 26 and the nozzle 31C of the injector 31 before being inserted into the injector mounting hole 26. It has an inner contour that forms a large inscribed circle. Therefore, as shown in FIG. 3, when the base end side of the cylindrical member 30 is inserted into the injector mounting hole 26, it is elastically deformed so that the maximum cross-sectional dimension of the outer contour is reduced, and the six corners 30B are formed in the injector. The mounting hole 26 elastically contacts the inner peripheral surface of the medium diameter portion 26C. The elastic deformation on the proximal end side of the cylindrical member 30 is mainly performed by bending deformation over the entire circumferential direction of the cylindrical member 30 to reduce the slit 30C, and the corner portion that increases the radius of curvature of the corner portion 30B. It is also performed by bending deformation of 30B.

インジェクタ取付孔２６の中径部２６Ｃの内径は、インジェクタ取付孔２６への挿入によって縮小した筒状部材３０の辺部３０Ａに接する内接円がノズル３１Ｃよりも大きくなるように設定されている。言い換えれば、インジェクタ取付孔２６に挿入された状態において、筒状部材３０の基端側は、ノズル３１Ｃよりも大きな内接円を形成する内輪郭を有しており、ノズル３１Ｃの外周面に当接していない。これにより、インジェクタ取付孔２６に先に挿入された筒状部材３０に上方からノズル３１Ｃを挿入する際に、ノズル３１Ｃが筒状部材３０の上端面に引っ掛かって挿入できなくなることがない。 The inner diameter of the medium diameter portion 26C of the injector mounting hole 26 is set so that the inscribed circle that contacts the side portion 30A of the cylindrical member 30 reduced by insertion into the injector mounting hole 26 is larger than the nozzle 31C. In other words, when inserted into the injector mounting hole 26, the proximal end side of the cylindrical member 30 has an inner contour that forms an inscribed circle larger than the nozzle 31C, and is in contact with the outer peripheral surface of the nozzle 31C. Not touching. Thereby, when the nozzle 31C is inserted from above into the cylindrical member 30 previously inserted into the injector mounting hole 26, the nozzle 31C is not caught by the upper end surface of the cylindrical member 30 and cannot be inserted.

図４は、図１中のIV−IV線に沿って示す、取付状態における筒状部材３０の先端側の断面図である。筒状部材３０の先端側は、インジェクタ３１のノズル３１Ｃが挿入される前の状態において、インジェクタ取付孔２６の中径部２６Ｃよりも小さな外接円を形成する外輪郭及び、インジェクタ３１のノズル３１Ｃよりも小さな内接円を形成する内輪郭を有している。従って、図４に示されるように、筒状部材３０の先端側はインジェクタ３１のノズル３１Ｃが挿入されると内輪郭の最小断面寸法が拡大するように弾性変形し、６つの辺部３０Ａがノズル３１Ｃの外周面に弾発的に当接する。筒状部材３０の先端側の弾性変形は、スリット３０Ｃを拡幅させる、筒状部材３０の周方向の全体に亘る曲げ変形によって主に行われ、辺部３０Ａの幅方向中央を径外方向に膨らませる各辺部３０Ａの曲げ変形によっても行われる。 FIG. 4 is a cross-sectional view of the distal end side of the cylindrical member 30 in the attached state, taken along line IV-IV in FIG. The distal end side of the tubular member 30 is formed from an outer contour that forms a circumscribed circle smaller than the medium diameter portion 26C of the injector mounting hole 26 and the nozzle 31C of the injector 31 before the nozzle 31C of the injector 31 is inserted. Also has an inner contour that forms a small inscribed circle. Therefore, as shown in FIG. 4, when the nozzle 31C of the injector 31 is inserted, the distal end side of the cylindrical member 30 is elastically deformed so that the minimum cross-sectional dimension of the inner contour is enlarged, and the six side portions 30A are nozzles. It elastically contacts the outer peripheral surface of 31C. The elastic deformation on the distal end side of the cylindrical member 30 is mainly performed by bending deformation over the entire circumferential direction of the cylindrical member 30 to widen the slit 30C, and the center in the width direction of the side portion 30A is expanded radially outward. This is also performed by bending deformation of each side 30A.

図４の例では、インジェクタ取付孔２６の中径部２６Ｃの内径は、ノズル３１Ｃの挿入によって拡大した筒状部材３０の角部３０Ｂの外接円よりも大きく設定されており、角部３０Ｂが中径部２６Ｃの内周面に接していない。他の例では、インジェクタ取付孔２６の中径部２６Ｃの内径が、ノズル３１Ｃの挿入によって拡大した筒状部材３０の角部３０Ｂの外接円よりも小さく設定され、角部３０Ｂが中径部２６Ｃの内周面に接してもよい。 In the example of FIG. 4, the inner diameter of the medium diameter portion 26C of the injector mounting hole 26 is set to be larger than the circumscribed circle of the corner portion 30B of the cylindrical member 30 expanded by the insertion of the nozzle 31C. It is not in contact with the inner peripheral surface of the diameter portion 26C. In another example, the inner diameter 26C of the inner diameter portion 26C of the injector mounting hole 26 is set to be smaller than the circumscribed circle of the corner portion 30B of the tubular member 30 expanded by inserting the nozzle 31C, and the corner portion 30B is set to the inner diameter portion 26C. It may be in contact with the inner peripheral surface.

インジェクタ３１は、以上のようにしてシリンダヘッド３に取り付けられている。以下、このように構成されたインジェクタ３１の取付構造の作用効果を説明する。 The injector 31 is attached to the cylinder head 3 as described above. Hereinafter, the effect of the attachment structure of the injector 31 configured as described above will be described.

図１に示されるように、インジェクタ３１のノズル３１Ｃの先端は、副燃焼室２４の燃焼ガスに晒されるため高温になり易い。一方、シリンダヘッド３は、ヘッド側ウォータジャケット３６によって冷却され、ノズル３１Ｃの温度よりも低い一定の温度に保たれる。ここで、筒状部材３０が、先端側においてノズル３１Ｃの外周面に当接し、基端側においてインジェクタ取付孔２６の内周面に当接しているため、ノズル３１Ｃの熱は筒状部材３０を介してシリンダヘッド３に伝達し、ノズル３１Ｃの過熱が防止される。即ち、筒状部材３０はノズル３１Ｃの熱は放出する放熱部材として機能する。 As shown in FIG. 1, the tip of the nozzle 31 C of the injector 31 is easily heated because it is exposed to the combustion gas in the auxiliary combustion chamber 24. On the other hand, the cylinder head 3 is cooled by the head-side water jacket 36 and maintained at a constant temperature lower than the temperature of the nozzle 31C. Here, since the cylindrical member 30 is in contact with the outer peripheral surface of the nozzle 31C on the distal end side and is in contact with the inner peripheral surface of the injector mounting hole 26 on the proximal end side, the heat of the nozzle 31C causes the cylindrical member 30 to be heated. To the cylinder head 3, and overheating of the nozzle 31 C is prevented. That is, the cylindrical member 30 functions as a heat radiating member that releases the heat of the nozzle 31C.

そして筒状部材３０は、図２に示されるように、複数の辺部３０Ａと複数の角部３０Ｂとを有する多角形断面を有するために弾性変形し易く、その先端の断面輪郭形状がその基端の断面輪郭形状よりも小さくされている。そのため、筒状部材３０は精密に加工されていなくても、図３に示される基端側において角部３０Ｂをインジェクタ取付孔２６の内周面に弾発的に当接させ、図４に示される先端側において辺部３０Ａをノズル３１Ｃの外周面に弾発的に当接させ、放熱部材として機能し得る。従って、放熱性のよいインジェクタ取付構造の製造コスト増大が抑制される。 As shown in FIG. 2, the cylindrical member 30 has a polygonal cross section having a plurality of side portions 30 A and a plurality of corner portions 30 B, and thus is easily elastically deformed. It is made smaller than the cross-sectional contour shape of the end. Therefore, even if the cylindrical member 30 is not precisely processed, the corner portion 30B is elastically brought into contact with the inner peripheral surface of the injector mounting hole 26 on the base end side shown in FIG. The side portion 30A is elastically brought into contact with the outer peripheral surface of the nozzle 31C on the leading end side to function as a heat radiating member. Therefore, an increase in manufacturing cost of the injector mounting structure with good heat dissipation is suppressed.

また、図３に示されるように、筒状部材３０は、基端においてノズル３１Ｃの外周面に当接していないため、先にインジェクタ取付孔２６に挿入された筒状部材３０にインジェクタ３１のノズル３１Ｃを容易に挿入することができる。 Further, as shown in FIG. 3, since the cylindrical member 30 is not in contact with the outer peripheral surface of the nozzle 31 C at the base end, the nozzle of the injector 31 is inserted into the cylindrical member 30 previously inserted into the injector mounting hole 26. 31C can be easily inserted.

本実施形態においては、図２に示されるように、筒状部材３０は、軸方向に沿って形成されたスリット３０Ｃを備える板金加工品であるため、加工が容易であり、低コストで製造可能である。 In the present embodiment, as shown in FIG. 2, the cylindrical member 30 is a sheet metal processed product having slits 30 C formed along the axial direction, so that it is easy to process and can be manufactured at low cost. It is.

≪第２実施形態≫
次に、図５を参照して第２実施形態について説明する。なお、上記実施形態と同一又は同様の要素には同一の符号或いは１の位が共通の対応する符号を付し、重複する説明は省略する。以下の実施形態においても同様とする。 << Second Embodiment >>
Next, a second embodiment will be described with reference to FIG. In addition, the same code | symbol or the corresponding code | symbol in which 1 place is common is attached | subjected to the element which is the same as that of the said embodiment, or the overlapping description is abbreviate | omitted. The same applies to the following embodiments.

図５は、第２実施形態に係る筒状部材４０の取付前状態を示す斜視図である。本実施形態では、筒状部材４０の構成や製造方法が第１実施形態と異なっている。具体的には、筒状部材４０は、円形や六角形等の断面の鋼管を拡管加工やスウェージング加工によってテーパ形状の正多角形断面（図示例では、正六角形断面）に加工してなる筒金であり、スリット３０Ｃ（図２）を備えない閉断面形状とされている。 FIG. 5 is a perspective view showing a state before attachment of the tubular member 40 according to the second embodiment. In this embodiment, the structure and manufacturing method of the cylindrical member 40 differ from 1st Embodiment. Specifically, the cylindrical member 40 is a cylinder formed by processing a steel pipe having a circular or hexagonal cross section into a tapered regular polygonal cross section (in the illustrated example, a regular hexagonal cross section) by pipe expansion processing or swaging processing. It is gold and has a closed cross-sectional shape without the slit 30C (FIG. 2).

筒状部材４０の基端側はインジェクタ取付孔２６に挿入されると外輪郭の最大断面寸法が縮小するように弾性変形し、６つの角部４０Ｂがインジェクタ取付孔２６の中径部２６Ｃの内周面に弾発的に当接する。筒状部材４０の基端側の弾性変形は、角部４０Ｂの曲率半径を大きくする角部４０Ｂの曲げ変形によって主に行われる。また、筒状部材４０の基端側の弾性変形は、辺部４０Ａの幅方向中央を径内方向に膨らませる各辺部４０Ａの曲げ変形を伴うこともある。 When the proximal end side of the tubular member 40 is inserted into the injector mounting hole 26, it is elastically deformed so that the maximum cross-sectional dimension of the outer contour is reduced, and the six corners 40B are the inner diameter portions 26C of the injector mounting hole 26. Elastically contact the circumferential surface. The elastic deformation on the proximal end side of the tubular member 40 is mainly performed by bending deformation of the corner portion 40B that increases the radius of curvature of the corner portion 40B. Further, the elastic deformation on the proximal end side of the tubular member 40 may be accompanied by bending deformation of each side portion 40A that causes the center in the width direction of the side portion 40A to expand radially inward.

筒状部材４０の先端側はインジェクタ３１のノズル３１Ｃが挿入されると内輪郭の最小断面寸法が拡大するように弾性変形し、６つの辺部４０Ａがノズル３１Ｃの外周面に弾発的に当接する。筒状部材４０の先端側の弾性変形は、辺部４０Ａの幅方向中央を径外方向に膨らませる各辺部４０Ａの曲げ変形によって行われる。 When the nozzle 31C of the injector 31 is inserted, the distal end side of the cylindrical member 40 is elastically deformed so that the minimum cross-sectional dimension of the inner contour is enlarged, and the six side portions 40A are elastically applied to the outer peripheral surface of the nozzle 31C. Touch. The elastic deformation on the distal end side of the cylindrical member 40 is performed by bending deformation of each side portion 40A that bulges the center in the width direction of the side portion 40A in the radially outward direction.

筒状部材４０は、第１実施形態のようなスリット３０Ｃを備えないことにより、インジェクタ取付孔２６への挿入のためにより大きな荷重を要する一方、第１実施形態よりも大きな接触面積をもって基端側の角部４０Ｂをインジェクタ取付孔２６の内周面に接触させる。また、筒状部材４０は、第１実施形態のようなスリット３０Ｃを備えないことにより、インジェクタ３１のノズル３１Ｃの挿入のためにより大きな荷重を要する一方、第１実施形態よりも大きな接触面積をもって先端側の辺部４０Ａをノズル３１Ｃの外周面に接触させる。従って、インジェクタ３１の放熱性が向上する。 Since the cylindrical member 40 does not include the slit 30C as in the first embodiment, it requires a larger load for insertion into the injector mounting hole 26, but has a larger contact area than that in the first embodiment and is on the proximal side. Are brought into contact with the inner peripheral surface of the injector mounting hole 26. Further, the cylindrical member 40 does not include the slit 30C as in the first embodiment, so that a larger load is required for the insertion of the nozzle 31C of the injector 31, while the tip has a larger contact area than the first embodiment. The side portion 40A is brought into contact with the outer peripheral surface of the nozzle 31C. Therefore, the heat dissipation of the injector 31 is improved.

≪第３実施形態≫
次に、図６を参照して第３実施形態について説明する。図６は、第３実施形態に係る筒状部材５０の、図４の要部に相当する基端側の拡大断面図である。本実施形態では、筒状部材５０の基端側は、インジェクタ取付孔２６に挿入される前の状態において、想像線で示されるように各辺部５０Ａの幅方向中央が内方に凸の湾曲形状をなす、正六角形に比べて星形に近い形状とされている。 «Third embodiment»
Next, a third embodiment will be described with reference to FIG. FIG. 6 is an enlarged cross-sectional view of the tubular member 50 according to the third embodiment on the base end side corresponding to the main part of FIG. In the present embodiment, the base end side of the cylindrical member 50 is curved in such a manner that the center in the width direction of each side portion 50A is inwardly projected as shown by an imaginary line before being inserted into the injector mounting hole 26. The shape is closer to a star shape than a regular hexagon.

図６に示されるように、筒状部材５０の基端側はインジェクタ取付孔２６に挿入されると外輪郭の最大断面寸法が縮小するように弾性変形する。筒状部材５０の基端側の弾性変形は、角部５０Ｂの曲率半径を大きくする角部５０Ｂの曲げ変形と、辺部５０Ａの幅方向中央を径内方向に膨らませる各辺部５０Ａの曲げ変形とにより行われる。インジェクタ取付孔２６に挿入される前の状態において、辺部５０Ａが内方に凸の湾曲形状をなす断面形状であることから、ノズル３１Ｃを筒状部材５０内に挿入する際に、左右の角部５０Ｂから圧縮力を受ける辺部５０Ａが径内方向に湾曲し易く、小さな荷重で筒状部材５０をインジェクタ取付孔２６に挿入することができる。 As shown in FIG. 6, when the proximal end side of the tubular member 50 is inserted into the injector mounting hole 26, it is elastically deformed so that the maximum cross-sectional dimension of the outer contour is reduced. The elastic deformation on the proximal end side of the cylindrical member 50 includes bending deformation of the corner portion 50B that increases the radius of curvature of the corner portion 50B, and bending of each side portion 50A that causes the center in the width direction of the side portion 50A to expand radially inward. By deformation. Since the side portion 50A has a cross-sectional shape that is curved inwardly in the state before being inserted into the injector mounting hole 26, when the nozzle 31C is inserted into the cylindrical member 50, the left and right corners are The side portion 50A that receives the compressive force from the portion 50B is easily bent in the radially inward direction, and the tubular member 50 can be inserted into the injector mounting hole 26 with a small load.

≪第４実施形態≫
次に、図７を参照して第４実施形態について説明する。図６は、第３実施形態に係る筒状部材６０の、図３の要部に相当する先端側の拡大断面図である。本実施形態では、筒状部材６０の先端側は、インジェクタ３１のノズル３１Ｃが挿入される前の状態において、想像線で示されるように各辺部６０Ａの幅方向中央が径外方向に膨らんだ、正六角形に比べて丸まった形状とされている。 << Fourth Embodiment >>
Next, a fourth embodiment will be described with reference to FIG. FIG. 6 is an enlarged cross-sectional view of the tubular member 60 according to the third embodiment on the front end side corresponding to the main part of FIG. In the present embodiment, the front end side of the cylindrical member 60 swells in the radially outward direction at the center in the width direction of each side portion 60A as indicated by an imaginary line before the nozzle 31C of the injector 31 is inserted. The shape is round compared to regular hexagons.

図６に示されるように、筒状部材６０の先端側はインジェクタ３１のノズル３１Ｃが挿入されると内輪郭の最小断面寸法が拡大するように弾性変形する。各辺部６０Ａの幅方向中央が径外方向に膨らんでいることから、本実施形態の筒状部材６０は、大きな接触面積をもって先端側の辺部６０Ａをノズル３１Ｃの外周面に接触させることができる上、ノズル３１Ｃの挿入に要する荷重を小さくすることができる。 As shown in FIG. 6, when the nozzle 31C of the injector 31 is inserted, the distal end side of the cylindrical member 60 is elastically deformed so that the minimum cross-sectional dimension of the inner contour is enlarged. Since the center in the width direction of each side portion 60A swells in the radially outward direction, the cylindrical member 60 of the present embodiment can bring the side portion 60A on the tip side into contact with the outer peripheral surface of the nozzle 31C with a large contact area. In addition, the load required to insert the nozzle 31C can be reduced.

≪第５実施形態≫
次に、図８〜図１０を参照して第５実施形態について説明する。図８は、第５実施形態に係る筒状部材７０の取付前状態を示す斜視図である。図８に示されるように、本実施形態の筒状部材７０は、基端から軸方向に沿って基端側の各辺部７０Ａに切欠状に形成された複数（図示例では６つ）の基端側スリット７０Ｄと、先端から軸方向に沿って先端側の各角部７０Ｂに切欠状に形成された複数（図示例では６つ）の先端側スリット７０Ｅとを備えている。基端側スリット７０Ｄは、辺部７０Ａの幅（辺の長さ）よりも小さな幅を有し、各辺部７０Ａの幅方向の中央に配置されている。先端側スリット７０Ｅは、湾曲する角部７０Ｂの幅よりも小さな幅を有し、各角部７０Ｂの幅方向の中心に配置されている。先端側スリット７０Ｅの軸方向長さは、基端側スリット７０Ｄの軸方向長さよりも短い。 «Fifth embodiment»
Next, a fifth embodiment will be described with reference to FIGS. FIG. 8 is a perspective view showing a state before attachment of the tubular member 70 according to the fifth embodiment. As shown in FIG. 8, the cylindrical member 70 of the present embodiment includes a plurality (six in the illustrated example) of notches formed in each side portion 70 A on the base end side along the axial direction from the base end. A proximal-side slit 70D and a plurality of (six in the illustrated example) distal-side slits 70E formed in a notch shape in each corner 70B on the distal side along the axial direction from the distal end are provided. The base end side slit 70D has a width smaller than the width of the side portion 70A (side length), and is arranged at the center in the width direction of each side portion 70A. The distal-side slit 70E has a width smaller than the width of the corner 70B that is curved, and is disposed at the center in the width direction of each corner 70B. The axial length of the distal side slit 70E is shorter than the axial length of the proximal side slit 70D.

基端側スリット７０Ｄ及び先端側スリット７０Ｅの合計軸方向長さは筒状部材７０の軸方向長さよりも短く、筒状部材７０の軸方向の中間部は、閉断面形状とされている。即ち、筒状部材７０は、テーパ形状の正多角形断面（図示例では、正六角形断面）に加工してなる筒金である。他の実施形態では、筒状部材７０は、鋼板を正多角形断面の筒状に曲げ加工してなる板金加工品であり、軸方向に沿って縦断するように形成された１本のスリット３０Ｃ（図２）を備える開断面形状であってもよい。 The total axial length of the proximal end side slit 70D and the distal end side slit 70E is shorter than the axial length of the cylindrical member 70, and the axial intermediate portion of the cylindrical member 70 has a closed cross-sectional shape. In other words, the cylindrical member 70 is a metal tube processed into a tapered regular polygonal cross section (in the illustrated example, a regular hexagonal cross section). In another embodiment, the cylindrical member 70 is a sheet metal processed product formed by bending a steel plate into a cylindrical shape having a regular polygonal cross section, and one slit 30C formed so as to be longitudinally cut along the axial direction. An open cross-sectional shape provided with (FIG. 2) may be sufficient.

図９は、図８に示される筒状部材７０の、図３に対応する基端側の断面図である。図９に示されるように、筒状部材７０の基端側はインジェクタ取付孔２６に挿入されると外輪郭の最大断面寸法が縮小するように弾性変形し、６つの角部７０Ｂがインジェクタ取付孔２６の中径部２６Ｃの内周面に弾発的に当接する。筒状部材７０の基端側の弾性変形は、各基端側スリット７０Ｄを減幅させる、筒状部材７０の軸方向における曲げ変形によって主に行われる。 9 is a cross-sectional view of the tubular member 70 shown in FIG. 8 on the proximal end side corresponding to FIG. As shown in FIG. 9, when the proximal end side of the cylindrical member 70 is inserted into the injector mounting hole 26, it is elastically deformed so that the maximum cross-sectional dimension of the outer contour is reduced, and the six corners 70 B are formed in the injector mounting hole. 26 elastically abuts against the inner peripheral surface of the medium diameter portion 26C. The elastic deformation on the proximal end side of the tubular member 70 is mainly performed by bending deformation in the axial direction of the tubular member 70 that reduces the width of each proximal end slit 70D.

図１０は、図８に示される筒状部材７０の、図４に対応する先端側の断面図である。図１０に示されるように、筒状部材７０の先端側はインジェクタ３１のノズル３１Ｃが挿入されると内輪郭の最小断面寸法が拡大するように弾性変形し、６つの辺部７０Ａがノズル３１Ｃの外周面に弾発的に当接する。筒状部材７０の先端側の弾性変形は、先端側スリット７０Ｅを拡幅させる、筒状部材７０の軸方向における曲げ変形によって主に行われる。 10 is a cross-sectional view of the cylindrical member 70 shown in FIG. 8 on the distal end side corresponding to FIG. As shown in FIG. 10, when the nozzle 31C of the injector 31 is inserted, the distal end side of the cylindrical member 70 is elastically deformed so that the minimum cross-sectional dimension of the inner contour is enlarged, and the six side portions 70A are formed on the nozzle 31C. It elastically contacts the outer peripheral surface. The elastic deformation on the distal end side of the tubular member 70 is mainly performed by bending deformation in the axial direction of the tubular member 70 that widens the distal end side slit 70E.

このように構成された筒状部材７０では、基端側の角部７０Ｂが径内方向に弾性変形し易くなるため、小さな荷重で筒状部材７０をインジェクタ取付孔２６に圧入できる上、先端側の辺部７０Ａが径外方向に弾性変形し易くなるため、小さな荷重でインジェクタ３１のノズル３１Ｃを筒状部材７０に圧入できる。 In the cylindrical member 70 configured as described above, since the corner portion 70B on the proximal end side is easily elastically deformed in the radially inward direction, the cylindrical member 70 can be press-fitted into the injector mounting hole 26 with a small load, and the distal end side Therefore, the nozzle 31C of the injector 31 can be pressed into the cylindrical member 70 with a small load.

≪第６実施形態≫
次に、図１１を参照して第６実施形態について説明する。図１１は、第６実施形態に係る筒状部材８０の取付前状態を示す概略側面図である。本実施形態では、筒状部材８０が、先端側から基端側に向けて断面が拡大するテーパ形状部８０Ｆと、先端側に形成され、軸方向に所定の長さに亘って辺部８０Ａがノズル３１Ｃの外周面に弾発的に当接する第１ストレート形状部８０Ｇを有している。これより、筒状部材８０の先端側がノズル３１Ｃの外周面に当接する面積が大きくなり、ノズル３１Ｃの熱が効率的に筒状部材８０に伝達される。そのため、ノズル３１Ｃが高温になることを一層抑制できる。 << Sixth Embodiment >>
Next, a sixth embodiment will be described with reference to FIG. FIG. 11 is a schematic side view showing a state before attachment of the tubular member 80 according to the sixth embodiment. In the present embodiment, the tubular member 80 is formed on the distal end side with a tapered shape portion 80F whose cross section expands from the distal end side toward the proximal end side, and the side portion 80A extends over a predetermined length in the axial direction. It has the 1st straight shape part 80G which contact | abuts elastically to the outer peripheral surface of the nozzle 31C. As a result, the area where the tip side of the cylindrical member 80 abuts on the outer peripheral surface of the nozzle 31 C increases, and the heat of the nozzle 31 C is efficiently transmitted to the cylindrical member 80. Therefore, it can further suppress that nozzle 31C becomes high temperature.

≪第７実施形態≫
次に、図１２を参照して第７実施形態について説明する。図１２は、第７実施形態に係る筒状部材９０の取付前状態を示す概略側面図である。本実施形態では、筒状部材９０が、先端側から基端側に向けて断面が拡大するテーパ形状部９０Ｆと、先端側に形成され、軸方向に所定の長さに亘って辺部９０Ａがノズル３１Ｃの外周面に弾発的に当接する第１ストレート形状部９０Ｇと、基端側に形成され、軸方向に所定の長さに亘って角部９０Ｂがインジェクタ取付孔２６の内周面に弾発的に当接する第２ストレート形状部９０Ｈとを有している。これより、筒状部材９０の先端側がノズル３１Ｃの外周面に当接する面積が大きくなり、ノズル３１Ｃの熱が効率的に筒状部材９０に伝達される。また、筒状部材９０の基端側がインジェクタ取付孔２６の内周面に当接する面積が大きくなり、ノズル３１Ｃから伝わった熱が筒状部材９０から効率的にシリンダヘッド３に伝達される。そのため、筒状部材９０及びノズル３１Ｃが高温になることを一層抑制できる。 << Seventh Embodiment >>
Next, a seventh embodiment will be described with reference to FIG. FIG. 12 is a schematic side view showing a state before attachment of the cylindrical member 90 according to the seventh embodiment. In the present embodiment, the cylindrical member 90 is formed on the distal end side with a tapered portion 90F whose cross section expands from the distal end side toward the proximal end side, and the side portion 90A extends over a predetermined length in the axial direction. A first straight-shaped portion 90G that elastically contacts the outer peripheral surface of the nozzle 31C and a base portion that is formed on the base end side, and a corner portion 90B extends on the inner peripheral surface of the injector mounting hole 26 over a predetermined length in the axial direction And a second straight-shaped portion 90H that abuts elastically. As a result, the area where the distal end side of the cylindrical member 90 abuts on the outer peripheral surface of the nozzle 31 C increases, and the heat of the nozzle 31 C is efficiently transmitted to the cylindrical member 90. Further, the area where the base end side of the cylindrical member 90 abuts on the inner peripheral surface of the injector mounting hole 26 is increased, and the heat transmitted from the nozzle 31C is efficiently transmitted from the cylindrical member 90 to the cylinder head 3. Therefore, it can suppress further that the cylindrical member 90 and the nozzle 31C become high temperature.

以上で具体的実施形態の説明を終えるが、本発明は上記実施形態に限定されることなく幅広く変形実施することができる。例えば、上記実施形態では、一例として副燃焼室式の内燃機関１への取付構造として本発明の説明を行ったが、直噴式のインジェクタ３１を用いるものであれば、内燃機関１が副燃焼室２４を備えていなくてもよい。また、上記実施形態は、適宜組み合わせてもよい。この他、各部材や部位の具体的構成や配置、数量、角度、素材、製造方法など、本発明の趣旨を逸脱しない範囲であれば適宜変更可能である。一方、上記実施形態に示した各構成要素は必ずしも全てが必須ではなく、適宜選択することができる。 Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the above-described embodiment, the present invention has been described as an example of a structure for mounting to the internal combustion engine 1 of the sub-combustion chamber type. However, if the direct-injection injector 31 is used, the internal combustion engine 1 is used as the auxiliary combustion chamber. 24 may not be provided. Moreover, you may combine the said embodiment suitably. In addition, the specific configuration, arrangement, quantity, angle, material, manufacturing method, and the like of each member and part can be changed as appropriate without departing from the spirit of the present invention. On the other hand, not all the constituent elements shown in the above embodiment are necessarily essential, and can be appropriately selected.

１内燃機関
２シリンダブロック
３シリンダヘッド
４エンジン本体（内燃機関本体）
１２主燃焼室
２４副燃焼室
２６インジェクタ取付孔
３０、４０、５０、６０、７０、８０、９０筒状部材
３０Ａ、４０Ａ、５０Ａ、６０Ａ、７０Ａ、８０Ａ、９０Ａ辺部
３０Ｂ、４０Ｂ、５０Ｂ、６０Ｂ、７０Ｂ、８０Ｂ、９０Ｂ角部
３０Ｃスリット
３１インジェクタ（燃料噴射弁）
３１Ｃノズル
７０Ｄ基端側スリット
７０Ｅ先端側スリット
８０Ｇ、９０Ｇ第１ストレート形状部
９０Ｈ第２ストレート形状部 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder block 3 Cylinder head 4 Engine main body (internal combustion engine main body)
12 Main combustion chamber 24 Sub combustion chamber 26 Injector mounting holes 30, 40, 50, 60, 70, 80, 90 Cylindrical members 30A, 40A, 50A, 60A, 70A, 80A, 90A Sides 30B, 40B, 50B, 60B , 70B, 80B, 90B Corner 30C Slit 31 Injector (fuel injection valve)
31C Nozzle 70D Base end side slit 70E Front end side slit 80G, 90G First straight shape portion 90H Second straight shape portion

Claims

An internal combustion engine body formed with a mounting hole communicating with the combustion chamber;
A cylindrical member inserted into the mounting hole;
A fuel injection valve inserted into the tubular member and having a nozzle for injecting fuel toward the combustion chamber;
The cylindrical member has a polygonal cross-section having a plurality of side portions and a plurality of corner portions, and a cross-sectional contour of a base end on a side opposite to the combustion chamber in a cross-sectional contour shape of a tip on the combustion chamber side. The corner is elastically brought into contact with the inner peripheral surface of the mounting hole on the base end side, and the side portion is elastically contacted with the outer peripheral surface of the nozzle on the distal end side. The fuel injection valve mounting structure is characterized in that they are brought into contact with each other.

The fuel injection valve mounting structure according to claim 1, wherein the cylindrical member is not in contact with an outer peripheral surface of the nozzle at the base end.

3. The fuel injection valve mounting structure according to claim 1, wherein the cylindrical member is a processed sheet metal product and includes a slit formed along an axial direction. 4.

2. The cylindrical member according to claim 1, wherein at least the base end of the cylindrical member has a cross-sectional shape in which the side portion forms an inwardly curved shape before being inserted into the mounting hole. The fuel injection valve mounting structure according to any one of claims 1 to 3.

2. The cylindrical member according to claim 1, wherein at least the tip of the cylindrical member has a cross-sectional shape in which the side portion is curved outwardly in a state before being inserted into the mounting hole. The fuel injection valve mounting structure according to claim 4.

The cylindrical member has a closed cross-sectional shape in an axial intermediate portion, and a tapered shape whose cross-section expands from the distal end side toward the proximal end side in a state before being inserted into the mounting hole. And
The base end side of the cylindrical member is formed with a plurality of base end side slits formed in the side portion along the axial direction from the base end. The fuel injection valve mounting structure according to any one of claims 5 to 6.

The cylindrical member has a closed cross-sectional shape in an axial intermediate portion, and a tapered shape whose cross-section expands from the distal end side toward the proximal end side in a state before being inserted into the mounting hole. And
The front end side of the cylindrical member is formed with a plurality of front end side slits formed at the corners along the axial direction from the front end. A fuel injection valve mounting structure according to claim 1.

The cylindrical member has a first straight shape portion formed on the tip end side, the side portion elastically contacting the outer peripheral surface of the nozzle over a predetermined length in the axial direction. The fuel injection valve mounting structure according to any one of claims 1 to 7.

The cylindrical member has a second straight-shaped portion that is formed on the base end side and in which the corner portion elastically contacts the inner peripheral surface of the mounting hole over a predetermined length in the axial direction. The fuel injection valve mounting structure according to any one of claims 1 to 8, wherein: