JP2021046850A - Injector mounting structure - Google Patents

Injector mounting structure Download PDF

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Publication number
JP2021046850A
JP2021046850A JP2019171579A JP2019171579A JP2021046850A JP 2021046850 A JP2021046850 A JP 2021046850A JP 2019171579 A JP2019171579 A JP 2019171579A JP 2019171579 A JP2019171579 A JP 2019171579A JP 2021046850 A JP2021046850 A JP 2021046850A
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Prior art keywords
hole
head
injector
cover
seal member
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JP7180573B2 (en
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悠一郎 甲斐
Yuichiro Kai
悠一郎 甲斐
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Priority to JP2019171579A priority Critical patent/JP7180573B2/en
Priority to DE112020004411.4T priority patent/DE112020004411T5/en
Priority to CN202080066193.4A priority patent/CN114423939B/en
Priority to PCT/JP2020/035190 priority patent/WO2021054385A1/en
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    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F11/00—Arrangements of sealings in combustion engines 
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

To prevent water from entering into a head hole.SOLUTION: An injector mounting structure includes: a head hole 4 and a cover hole 5 respectively formed in a manner of penetrating through a cylinder head 2 and a head cover 3 fastened to each other; an injector 1 inserted to the head hole and the cover hole at an interval in a radial direction; a first seal member 6 detachably attached to the head cover at a periphery of the cover hole and kept into contact with the injector to seal a clearance between the cover hole and the injector; and a second seal member 7 attached while held by the cylinder head and the head cover at a periphery of the head hole and kept into contact with the injector to seal a clearance between the head hole and the injector.SELECTED DRAWING: Figure 1

Description

本開示はインジェクタ取付構造に関する。 The present disclosure relates to an injector mounting structure.

一般に直噴式内燃機関においては、互いに締結されるシリンダヘッドおよびヘッドカバーにヘッド孔およびカバー孔がそれぞれ貫通して設けられる。これらヘッド孔およびカバー孔には半径方向の隙間を隔ててインジェクタが挿入される。カバー孔とインジェクタの隙間がシール部材によりシールされる。 Generally, in a direct-injection internal combustion engine, a head hole and a cover hole are provided through the cylinder head and the head cover to be fastened to each other. Injectors are inserted into these head holes and cover holes with a radial gap. The gap between the cover hole and the injector is sealed by the sealing member.

特開２００９−２３６２１９号公報Japanese Unexamined Patent Publication No. 2009-236219

上記のシール部材がヘッドカバーに着脱可能に取り付けられる場合がある。この場合、例えば組立時にインジェクタを位置調節等のため挿抜させたときなどに、シール部材がずれてシールが甘くなり、カバー孔ひいてはヘッド孔に外部から水が浸入する虞がある。ヘッド孔に水が浸入すると、その水がヘッド孔の底部に比較的長期に亘って滞留し、シリンダヘッドおよびインジェクタを錆び付かせる虞がある。 The above sealing member may be detachably attached to the head cover. In this case, for example, when the injector is inserted or removed for position adjustment during assembly, the seal member may be displaced and the seal may be loosened, and water may enter the cover hole and thus the head hole from the outside. If water enters the head hole, the water may stay at the bottom of the head hole for a relatively long period of time, causing the cylinder head and injector to rust.

そこで本開示は、かかる事情に鑑みて創案され、その目的は、ヘッド孔への水の浸入を抑制することができるインジェクタ取付構造を提供することにある。 Therefore, the present disclosure was devised in view of such circumstances, and an object of the present disclosure is to provide an injector mounting structure capable of suppressing the intrusion of water into the head hole.

本開示の一の態様によれば、
互いに締結されるシリンダヘッドおよびヘッドカバーにそれぞれ貫通して設けられたヘッド孔およびカバー孔と、
前記ヘッド孔および前記カバー孔に半径方向の隙間を隔てて挿入されるインジェクタと、
前記カバー孔の周囲にて前記ヘッドカバーに着脱可能に取り付けられ、前記インジェクタに接触されて前記カバー孔と前記インジェクタの隙間をシールする第１シール部材と、
前記ヘッド孔の周囲にて前記シリンダヘッドと前記ヘッドカバーに挟まれて取り付けられ、前記インジェクタに接触されて前記ヘッド孔と前記インジェクタの隙間をシールする第２シール部材と、
を備えたことを特徴とするインジェクタ取付構造が提供される。 According to one aspect of the present disclosure
Head holes and cover holes provided through the cylinder head and head cover to be fastened to each other, respectively.
An injector inserted into the head hole and the cover hole with a radial gap, and
A first seal member that is detachably attached to the head cover around the cover hole and is brought into contact with the injector to seal the gap between the cover hole and the injector.
A second seal member that is attached by being sandwiched between the cylinder head and the head cover around the head hole and is brought into contact with the injector to seal the gap between the head hole and the injector.
An injector mounting structure is provided that comprises.

好ましくは、前記第２シール部材は、前記シリンダヘッドと前記ヘッドカバーの間の隙間をシールする。 Preferably, the second sealing member seals the gap between the cylinder head and the head cover.

本開示によれば、ヘッド孔への水の浸入を抑制することができる。 According to the present disclosure, it is possible to suppress the infiltration of water into the head hole.

インジェクタ取付構造を示す縦断面図である。It is a vertical cross-sectional view which shows the injector mounting structure. 図１の要部拡大図である。It is an enlarged view of the main part of FIG.

以下、添付図面を参照して本開示の実施形態を説明する。なお本開示は以下の実施形態に限定されない点に留意されたい。 Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the present disclosure is not limited to the following embodiments.

図１は、本実施形態に係るインジェクタ取付構造を示す縦断面図である。かかる取付構造は、直噴式内燃機関（エンジン）に燃料噴射弁としてのインジェクタ１を取り付けるための構造である。本実施形態のエンジンは車両用ディーゼルエンジンであるが、その種類、用途等に特に限定はなく、例えばエンジンはガソリンエンジンであってもよい。 FIG. 1 is a vertical cross-sectional view showing an injector mounting structure according to the present embodiment. Such a mounting structure is a structure for mounting an injector 1 as a fuel injection valve to a direct injection type internal combustion engine (engine). The engine of the present embodiment is a diesel engine for vehicles, but the type and use thereof are not particularly limited. For example, the engine may be a gasoline engine.

エンジンは多気筒エンジンであるが、図には１気筒分のみを示す。便宜上、各部の特徴を強調するため各部の寸法はデフォルメされている。 The engine is a multi-cylinder engine, but the figure shows only one cylinder. For convenience, the dimensions of each part are deformed to emphasize the characteristics of each part.

インジェクタ取付構造は、互いに締結されるシリンダヘッド２およびヘッドカバー３にそれぞれ貫通して設けられたヘッド孔４およびカバー孔５と、ヘッド孔４およびカバー孔５に半径方向の隙間を隔てて挿入されたインジェクタ１と、カバー孔５の周囲にてヘッドカバー３に着脱可能に取り付けられ、インジェクタ１に接触されてカバー孔５とインジェクタ１の隙間をシールする第１シール部材６と、ヘッド孔４の周囲にてシリンダヘッド２とヘッドカバー３に挟まれて取り付けられ、インジェクタ１に接触されてヘッド孔４とインジェクタ１の隙間をシールする第２シール部材７とを備える。 The injector mounting structure is inserted into the head hole 4 and the cover hole 5 provided so as to penetrate the cylinder head 2 and the head cover 3 to be fastened to each other, and the head hole 4 and the cover hole 5 with a radial gap. Around the injector 1, the first seal member 6 that is detachably attached to the head cover 3 around the cover hole 5 and is in contact with the injector 1 to seal the gap between the cover hole 5 and the injector 1, and around the head hole 4. A second sealing member 7 is provided which is sandwiched between the cylinder head 2 and the head cover 3 and is brought into contact with the injector 1 to seal the gap between the head hole 4 and the injector 1.

本実施形態の場合、シリンダヘッド２は上下に分割され、下部のシリンダヘッド本体２Ａと上部のカムキャリア２Ｂとから構成される。これらは互いに重ね合わされ図示しないボルトにより組み付けられる。シリンダヘッド本体２Ａには主にバルブ、バルブスプリング等（図示せず）が組み付けられ、カムキャリア２Ｂには主にカムシャフト（図示せず）が組み付けられる。なお、シリンダヘッド２は分割構造でなくてもよい。 In the case of the present embodiment, the cylinder head 2 is divided into upper and lower parts, and is composed of a lower cylinder head main body 2A and an upper cam carrier 2B. These are superposed on each other and assembled by bolts (not shown). A valve, a valve spring, etc. (not shown) are mainly assembled to the cylinder head main body 2A, and a camshaft (not shown) is mainly assembled to the cam carrier 2B. The cylinder head 2 does not have to have a divided structure.

ヘッド孔４は、シリンダヘッド本体２Ａに設けられた本体孔４Ａと、カムキャリア２Ｂに設けられたキャリア孔４Ｂとから構成される。これら孔４Ａ，４Ｂは同軸に位置される。これら孔４Ａ，４Ｂは、インジェクタ１より僅かに大径であり、互いに同径とされるが、互いに異径とされてもよい。本体孔４Ａの下端部には縮径部９が設けられ、これにより本体孔４Ａには、孔軸Ｃに垂直な平面からなる肩部８が形成される。この肩部８にインジェクタ１の肩部１０が押し付けられて両者の間がシールされる。なお、両者の肩部８，１０の間にシールパッキンを介設してもよい。孔軸Ｃは、ヘッド孔４の中心軸を意味し、本実施形態ではキャリア孔４Ｂの中心軸を意味する。 The head hole 4 is composed of a main body hole 4A provided in the cylinder head main body 2A and a carrier hole 4B provided in the cam carrier 2B. These holes 4A and 4B are located coaxially. These holes 4A and 4B have a slightly larger diameter than the injector 1 and have the same diameter as each other, but may have different diameters from each other. A reduced diameter portion 9 is provided at the lower end of the main body hole 4A, whereby a shoulder portion 8 formed of a plane perpendicular to the hole axis C is formed in the main body hole 4A. The shoulder portion 10 of the injector 1 is pressed against the shoulder portion 8 to seal between the two. A seal packing may be provided between the shoulders 8 and 10 of the two. The hole shaft C means the central shaft of the head hole 4, and in the present embodiment, means the central shaft of the carrier hole 4B.

縮径部９には、同様に縮径されたインジェクタ１のノズル部１Ａが挿入される。ノズル部１Ａの先端の噴孔１１から燃焼室１２内に燃料が噴射される。 The nozzle portion 1A of the injector 1 having the same reduced diameter is inserted into the reduced diameter portion 9. Fuel is injected into the combustion chamber 12 from the injection hole 11 at the tip of the nozzle portion 1A.

ヘッドカバー３は、カムキャリア２Ｂ上に組み付けられてカムキャリア２Ｂを覆う。本実施形態のヘッドカバー３は樹脂製であるが、金属製であってもよい。ヘッドカバー３は複数のボルト１３（一つのみ図示）によってカムキャリア２Ｂ上に組み付けられる。ボルト１３の周りには円筒状のカラー１４が嵌合され、ボルト１３の締め付けによるヘッドカバー３の圧縮変形が防止されるようになっている。カラー１４はヘッドカバー３のカラー孔１５に嵌合挿入され、カラー１４とカラー孔１５の隙間はカラーシール部材１６によりシールされる。ボルト１３は、カムキャリア２Ｂに設けられた雌ネジ穴２１に締め付けられる。 The head cover 3 is assembled on the cam carrier 2B and covers the cam carrier 2B. The head cover 3 of the present embodiment is made of resin, but may be made of metal. The head cover 3 is assembled on the cam carrier 2B by a plurality of bolts 13 (only one is shown). A cylindrical collar 14 is fitted around the bolt 13 to prevent compression deformation of the head cover 3 due to tightening of the bolt 13. The collar 14 is fitted and inserted into the collar hole 15 of the head cover 3, and the gap between the collar 14 and the collar hole 15 is sealed by the color seal member 16. The bolt 13 is tightened in the female screw hole 21 provided in the cam carrier 2B.

カバー孔５は、キャリア孔４Ｂと同軸に位置される。カバー孔５は、インジェクタ１より僅かに大径であり、キャリア孔４Ｂと同径とされるが、キャリア孔４Ｂに対し異径とされてもよい。 The cover hole 5 is located coaxially with the carrier hole 4B. The cover hole 5 has a slightly larger diameter than the injector 1 and has the same diameter as the carrier hole 4B, but may have a different diameter than the carrier hole 4B.

また、インジェクタ１を下方に押圧してインジェクタ１の肩部１０を本体孔４Ａの肩部８に押し付けるインジェクタブラケット１７が設けられる。周知のようにインジェクタブラケット１７は、その先端部に二股状の指部１８を備え、ボルト１９によって下方に押されることにより、基端部を支点として回転し、指部１８によりインジェクタ１の係合面２０を下方に押すようになっている。 Further, an injector bracket 17 is provided which presses the injector 1 downward to press the shoulder portion 10 of the injector 1 against the shoulder portion 8 of the main body hole 4A. As is well known, the injector bracket 17 is provided with a bifurcated finger portion 18 at its tip, and is pushed downward by a bolt 19 to rotate with the base end as a fulcrum, and the injector 1 is engaged by the finger portion 18. The surface 20 is pushed downward.

ボルト１９は、ヘッドカバー３に設けられた挿通孔２２と、カムキャリア２Ｂに設けられた挿通孔２３とに上方から順次挿通された後、シリンダヘッド本体２Ａに設けられた雌ネジ穴２４に締め付けられる。ボルト１９の上端に位置する頭部（図示せず）がインジェクタブラケット１７を下方に押す。 The bolt 19 is sequentially inserted from above into the insertion hole 22 provided in the head cover 3 and the insertion hole 23 provided in the cam carrier 2B, and then tightened in the female screw hole 24 provided in the cylinder head body 2A. .. A head (not shown) located at the upper end of the bolt 19 pushes the injector bracket 17 downward.

図２にも示すように、第１シール部材６は、ゴム等の弾性材料でできた円環状の部材である。第１シール部材６は、孔軸Ｃに垂直な円環板状の円盤部２５と、円盤部２５の外周端縁部から孔軸Ｃ方向下方に突出する円筒状の鍔部２６とを一体に備え、断面Ｌ字状に形成される。 As shown in FIG. 2, the first sealing member 6 is an annular member made of an elastic material such as rubber. The first sealing member 6 integrally includes an annular plate-shaped disk portion 25 perpendicular to the hole axis C and a cylindrical flange portion 26 protruding downward in the hole axis C direction from the outer peripheral edge portion of the disk portion 25. It is formed with an L-shaped cross section.

これに対応して、ヘッドカバー３の上面部におけるカバー孔５の周囲には、第１シール部材６を取り付けるための第１取付溝２７が設けられる。第１取付溝２７も円環状かつ断面Ｌ字状に形成される。 Correspondingly, a first mounting groove 27 for mounting the first sealing member 6 is provided around the cover hole 5 on the upper surface portion of the head cover 3. The first mounting groove 27 is also formed in an annular shape and an L-shaped cross section.

第１シール部材６は、自身の弾性力により第１取付溝２７の内面に密着して第１取付溝２７に着脱可能に取り付けられる。詳しくは、円盤部２５と鍔部２６の外周面が第１取付溝２７の外側周面２８に弾性的に密着され、鍔部２６の内周面が第１取付溝２７の内側周面２９に弾性的に密着される。そして円盤部２５は第１取付溝２７の底面３０に着座される。 The first seal member 6 is detachably attached to the first mounting groove 27 in close contact with the inner surface of the first mounting groove 27 by its own elastic force. Specifically, the outer peripheral surfaces of the disk portion 25 and the flange portion 26 are elastically brought into close contact with the outer peripheral surface 28 of the first mounting groove 27, and the inner peripheral surface of the flange portion 26 is attached to the inner peripheral surface 29 of the first mounting groove 27. It is elastically adhered. Then, the disk portion 25 is seated on the bottom surface 30 of the first mounting groove 27.

一方、円盤部２５の内周端縁部３１がインジェクタ１の外周面３２に弾性的に密着される。これにより、カバー孔５と、インジェクタ１の外周面３２との隙間３３がシールされる。 On the other hand, the inner peripheral edge portion 31 of the disk portion 25 is elastically adhered to the outer peripheral surface 32 of the injector 1. As a result, the gap 33 between the cover hole 5 and the outer peripheral surface 32 of the injector 1 is sealed.

なお「ＡがＢに弾性的に密着する」とは、ＡがＢによって圧縮変形されたときの反力によってＡがＢに密着することをいう。 Note that "A elastically adheres to B" means that A adheres to B due to the reaction force when A is compressionally deformed by B.

第１シール部材６は主として、外部の塵埃を隙間３３に浸入させないためのダストシールとして機能する。 The first seal member 6 mainly functions as a dust seal for preventing external dust from entering the gap 33.

次に、第２シール部材７について説明する。第２シール部材７は、ゴム等の弾性材料でできた円環状の部材である。第２シール部材７は、孔軸Ｃに垂直な円環板状の円盤部４１と、円盤部４１の半径方向中間部から孔軸Ｃ方向下方に突出する円筒状の鍔部４２とを一体に備え、断面Ｔ字状に形成される。 Next, the second seal member 7 will be described. The second seal member 7 is an annular member made of an elastic material such as rubber. The second seal member 7 integrally includes an annular plate-shaped disk portion 41 perpendicular to the hole axis C and a cylindrical flange portion 42 protruding downward in the hole axis C direction from the radial intermediate portion of the disk portion 41. It is formed with a T-shaped cross section.

円盤部４１は、カムキャリア２Ｂの上面とヘッドカバー３の下面との間に挟まれて固定される。またカムキャリア２Ｂの上面部において、キャリア孔４Ｂから半径方向外側に所定距離離れた位置には、鍔部４２を嵌合挿入するための環状の凹部４３が設けられる。 The disk portion 41 is sandwiched and fixed between the upper surface of the cam carrier 2B and the lower surface of the head cover 3. Further, on the upper surface portion of the cam carrier 2B, an annular recess 43 for fitting and inserting the collar portion 42 is provided at a position separated from the carrier hole 4B by a predetermined distance outward in the radial direction.

凹部４３に鍔部４２を挿入した状態で円盤部４１を挟むと、矢示するように、円盤部４１の上面４１Ａがヘッドカバー３の下面に弾性的に密着し、鍔部４２の底面４２Ａが凹部４３の底面に弾性的に密着するようになる。これにより、カムキャリア２Ｂとヘッドカバー３の間の隙間４４が第２シール部材７によってシールされる。なお他方側でも、この隙間４４は第３シール部材４５によってシールされる。 When the disk portion 41 is sandwiched with the collar portion 42 inserted in the recess 43, the upper surface 41A of the disk portion 41 elastically adheres to the lower surface of the head cover 3 and the bottom surface 42A of the collar portion 42 is recessed as shown by the arrow. It comes into elastic contact with the bottom surface of 43. As a result, the gap 44 between the cam carrier 2B and the head cover 3 is sealed by the second sealing member 7. On the other side as well, the gap 44 is sealed by the third sealing member 45.

一方、円盤部４１の内周端縁部４６がインジェクタ１の外周面３２に弾性的に密着される。これにより、キャリア孔４Ｂと、インジェクタ１の外周面３２との隙間４７がシールされる。すなわち、この隙間４７は、カムキャリア２Ｂとヘッドカバー３の隙間４４からシールもしくは隔絶され、同時に、カバー孔５とインジェクタ１の隙間３３からもシールもしくは隔絶される。 On the other hand, the inner peripheral edge portion 46 of the disk portion 41 is elastically brought into close contact with the outer peripheral surface 32 of the injector 1. As a result, the gap 47 between the carrier hole 4B and the outer peripheral surface 32 of the injector 1 is sealed. That is, the gap 47 is sealed or isolated from the gap 44 between the cam carrier 2B and the head cover 3, and at the same time, sealed or isolated from the gap 33 between the cover hole 5 and the injector 1.

第２シール部材７は主として、隙間４４に存在するシリンダヘッド２内のオイルを隙間４７に浸入させないためのオイルシールとして機能する。本実施形態では同時に、隙間３３に浸入した水を隙間４７に浸入させないようにする機能を、第２シール部材７に持たせた点に特徴がある。なお第３シール部材４５は第２シール部材７と同様のオイルシールとして機能する。 The second seal member 7 mainly functions as an oil seal for preventing the oil in the cylinder head 2 existing in the gap 44 from entering the gap 47. At the same time, the present embodiment is characterized in that the second seal member 7 has a function of preventing water that has entered the gap 33 from entering the gap 47. The third seal member 45 functions as an oil seal similar to the second seal member 7.

さて、本実施形態では第１シール部材６がヘッドカバー３に固定されておらず、着脱可能に取り付けられている。この場合、例えば組立時にインジェクタ１を位置調節等のため挿抜させたときや、エンジンが振動したときなどに、第１シール部材６がずれてシールが甘くなり、カバー孔５もしくは隙間３３に外部から水が浸入する虞がある。なお第１シール部材６のずれには、第１シール部材６の一部もしくは全部が第１取付溝２７から外れることが含まれる。 By the way, in the present embodiment, the first seal member 6 is not fixed to the head cover 3, but is detachably attached. In this case, for example, when the injector 1 is inserted or removed for position adjustment during assembly, or when the engine vibrates, the first seal member 6 is displaced and the seal becomes loose, and the cover hole 5 or the gap 33 is opened from the outside. Water may infiltrate. The deviation of the first seal member 6 includes the fact that a part or all of the first seal member 6 comes off from the first mounting groove 27.

本開示の着想前の比較例においては、第２シール部材７がインジェクタ１に接触していない。そのため、カバー孔５もしくは隙間３３に浸入した水が、第２シール部材７とインジェクタ１の隙間からその下方のヘッド孔４もしくは隙間４７にさらに浸入する虞がある。水が浸入すると、その水がヘッド孔４（具体的には本体孔４Ａ）の底部に比較的長期に亘って滞留し、シリンダヘッド２（具体的にはシリンダヘッド本体２Ａ）およびインジェクタ１を錆び付かせる虞がある。 In the comparative example before the idea of the present disclosure, the second seal member 7 is not in contact with the injector 1. Therefore, the water that has entered the cover hole 5 or the gap 33 may further enter the head hole 4 or the gap 47 below the gap between the second seal member 7 and the injector 1. When water infiltrates, the water stays at the bottom of the head hole 4 (specifically, the main body hole 4A) for a relatively long period of time, and rusts the cylinder head 2 (specifically, the cylinder head main body 2A) and the injector 1. There is a risk of attaching it.

これに対し、本実施形態では、第２シール部材７がインジェクタ１に接触し、ヘッド孔４とインジェクタ１の隙間（具体的にはキャリア孔４Ｂとインジェクタ１の隙間４７）をシールする。このため、仮にカバー孔５に水が浸入しても、その水を止水し、その水がヘッド孔４に浸入することを抑制できる。そしてその水がヘッド孔４の底部に滞留し、例えばシリンダヘッド本体２Ａおよびインジェクタ１を錆び付かせることを抑制することができる。 On the other hand, in the present embodiment, the second seal member 7 contacts the injector 1 and seals the gap between the head hole 4 and the injector 1 (specifically, the gap 47 between the carrier hole 4B and the injector 1). Therefore, even if water enters the cover hole 5, the water can be stopped and the water can be prevented from entering the head hole 4. Then, it is possible to prevent the water from staying at the bottom of the head hole 4 and causing the cylinder head body 2A and the injector 1 to rust, for example.

また、第２シール部材７がシリンダヘッド２（具体的にはカムキャリア２Ｂ）とヘッドカバー３に挟まれて固定されているので、インジェクタ１の挿抜やエンジンの振動等によっても第２シール部材７がずれることがなく、シールを長期間安定して維持することができる。 Further, since the second seal member 7 is sandwiched and fixed between the cylinder head 2 (specifically, the cam carrier 2B) and the head cover 3, the second seal member 7 can be moved by inserting or removing the injector 1 or by vibrating the engine. The seal can be maintained stably for a long period of time without shifting.

しかも、比較例における既存の第２シール部材７の内径を縮径してインジェクタ１に接触させるだけで済むので、既存の第２シール部材７の構成を僅かに改良するだけで所望の効果を得られる。 Moreover, since it is only necessary to reduce the inner diameter of the existing second seal member 7 in the comparative example and bring it into contact with the injector 1, a desired effect can be obtained by slightly improving the configuration of the existing second seal member 7. Be done.

第２シール部材７が挟まれて固定されているので、第２シール部材７の内径を小さめに設定してその内周端縁部４６をインジェクタ１に強く接触させても、インジェクタ１の挿抜等の際に第２シール部材７をずれ難くすることができる。よってシール性を増しつつ、シールの安定度を高めることができる。 Since the second seal member 7 is sandwiched and fixed, even if the inner diameter of the second seal member 7 is set small and the inner peripheral end edge portion 46 is strongly brought into contact with the injector 1, the injector 1 can be inserted or removed, etc. At this time, the second seal member 7 can be made difficult to shift. Therefore, the stability of the seal can be improved while increasing the sealing property.

以上、本開示の実施形態を詳細に述べたが、本開示は以下のような他の実施形態も可能である。 Although the embodiments of the present disclosure have been described in detail above, the present disclosure may also include the following other embodiments.

（１）例えば、第２シール部材７の断面形状は変更可能であり、Ｌ形等とすることもできる。 (1) For example, the cross-sectional shape of the second seal member 7 can be changed and may be L-shaped or the like.

（２）同様に、第１シール部材６の断面形状も変更可能である。 (2) Similarly, the cross-sectional shape of the first seal member 6 can be changed.

本開示の実施形態は前述の実施形態のみに限らず、特許請求の範囲によって規定される本開示の思想に包含されるあらゆる変形例や応用例、均等物が本開示に含まれる。従って本開示は、限定的に解釈されるべきではなく、本開示の思想の範囲内に帰属する他の任意の技術にも適用することが可能である。 The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents included in the ideas of the present disclosure defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be construed in a limited manner and may be applied to any other technique belonging within the scope of the ideas of the present disclosure.

１ インジェクタ
２ シリンダヘッド
３ ヘッドカバー
４ ヘッド孔
５ カバー孔
６ 第１シール部材
７ 第２シール部材 1 Injector 2 Cylinder head 3 Head cover 4 Head hole 5 Cover hole 6 1st seal member 7 2nd seal member

Claims (2)

互いに締結されるシリンダヘッドおよびヘッドカバーにそれぞれ貫通して設けられたヘッド孔およびカバー孔と、
前記ヘッド孔および前記カバー孔に半径方向の隙間を隔てて挿入されるインジェクタと、
前記カバー孔の周囲にて前記ヘッドカバーに着脱可能に取り付けられ、前記インジェクタに接触されて前記カバー孔と前記インジェクタの隙間をシールする第１シール部材と、
前記ヘッド孔の周囲にて前記シリンダヘッドと前記ヘッドカバーに挟まれて取り付けられ、前記インジェクタに接触されて前記ヘッド孔と前記インジェクタの隙間をシールする第２シール部材と、
を備えたことを特徴とするインジェクタ取付構造。 Head holes and cover holes provided through the cylinder head and head cover to be fastened to each other, respectively.
An injector inserted into the head hole and the cover hole with a radial gap, and
A first seal member that is detachably attached to the head cover around the cover hole and is brought into contact with the injector to seal the gap between the cover hole and the injector.
A second seal member that is attached by being sandwiched between the cylinder head and the head cover around the head hole and is brought into contact with the injector to seal the gap between the head hole and the injector.
Injector mounting structure characterized by being equipped with. 前記第２シール部材は、前記シリンダヘッドと前記ヘッドカバーの間の隙間をシールする
請求項１に記載のインジェクタ取付構造。 The injector mounting structure according to claim 1, wherein the second seal member seals a gap between the cylinder head and the head cover.
JP2019171579A 2019-09-20 2019-09-20 Injector mounting structure Active JP7180573B2 (en)

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DE112020004411.4T DE112020004411T5 (en) 2019-09-20 2020-09-17 INJECTOR MOUNTING STRUCTURE
CN202080066193.4A CN114423939B (en) 2019-09-20 2020-09-17 Injector mounting structure
PCT/JP2020/035190 WO2021054385A1 (en) 2019-09-20 2020-09-17 Injector attachment structure

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