JP4471933B2 - Cylinder head structure of direct injection diesel engine - Google Patents

Cylinder head structure of direct injection diesel engine Download PDF

Info

Publication number
JP4471933B2
JP4471933B2 JP2006006462A JP2006006462A JP4471933B2 JP 4471933 B2 JP4471933 B2 JP 4471933B2 JP 2006006462 A JP2006006462 A JP 2006006462A JP 2006006462 A JP2006006462 A JP 2006006462A JP 4471933 B2 JP4471933 B2 JP 4471933B2
Authority
JP
Japan
Prior art keywords
cylinder head
injector
seal
insertion hole
cam holder
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.)
Expired - Fee Related
Application number
JP2006006462A
Other languages
Japanese (ja)
Other versions
JP2007187105A (en
Inventor
直秀 磯
大二郎 石本
宏志 児玉
和洋 高原
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.)
Mazda Motor Corp
Kokoku Intech Co Ltd
Original Assignee
Mazda Motor Corp
Kokoku Intech Co 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 Mazda Motor Corp, Kokoku Intech Co Ltd filed Critical Mazda Motor Corp
Priority to JP2006006462A priority Critical patent/JP4471933B2/en
Priority to EP20070100140 priority patent/EP1808597B1/en
Publication of JP2007187105A publication Critical patent/JP2007187105A/en
Application granted granted Critical
Publication of JP4471933B2 publication Critical patent/JP4471933B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0476—Camshaft bearings
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
    • 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

Landscapes

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

Description

本発明は、ディーゼルエンジンの燃焼室に燃料を直接噴射するインジェクタを、シリンダヘッドとシリンダヘッドに載置固定されたカムホルダとに貫通状に直立配置した、直噴ディーゼルエンジンのシリンダヘッド構造に関するものである。   The present invention relates to a cylinder head structure for a direct injection diesel engine, in which an injector that directly injects fuel into a combustion chamber of a diesel engine is vertically arranged in a penetrating manner between a cylinder head and a cam holder mounted and fixed on the cylinder head. is there.

従来、自動車に搭載される直噴ディーゼルエンジンにおいて、特許文献１のシリンダヘッド構造では、シリンダヘッドの上部にカムシャフトが配設され、このカムシャフトを回転自在に支持するカムホルダがシリンダヘッドの上面に載置固定され、このシリンダヘッドとカムホルダとに複数気筒の燃焼室に燃料を夫々直接噴射する複数のインジェクタが貫通状に直立配置されている。   2. Description of the Related Art Conventionally, in a direct injection diesel engine mounted on an automobile, in the cylinder head structure of Patent Document 1, a camshaft is disposed on an upper portion of the cylinder head, and a cam holder that rotatably supports the camshaft is provided on the upper surface of the cylinder head. A plurality of injectors, which are mounted and fixed and directly inject fuel into the combustion chambers of the plurality of cylinders, are vertically arranged in a penetrating manner on the cylinder head and the cam holder.

この直噴ディーゼルエンジンのシリンダヘッド構造では、シリンダヘッドカバーによりシリンダヘッドの動弁室を含む上部が外部空間に対して油密に保持され、このシリンダヘッドカバーに形成された開口部からインジェクタの上端部分を上方へ突出させて、インジェクタのメンテナンスにおける作業性、即ちサービス性の向上を図っている。   In the cylinder head structure of this direct injection diesel engine, the upper part including the valve chamber of the cylinder head is oil-tightly held with respect to the external space by the cylinder head cover, and the upper end portion of the injector is extended from the opening formed in the cylinder head cover. By projecting upward, the workability in the maintenance of the injector, that is, the serviceability is improved.

シリンダヘッドとカムホルダには、インジェクタを挿通させるインジェクタホールと挿通孔部が形成されているが、インジェクタの周囲のシール性を確保するために、挿通孔部の内周面とインジェクタとの間に環状シール材が装着され、シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とが当接し、これら両外周近傍部の一方（シリンダヘッド側）に形成された環状溝にＯリングが嵌合された状態で、このＯリングが前記両外周近傍部間に装着されている。   The cylinder head and the cam holder are formed with an injector hole and an insertion hole portion through which the injector is inserted, but in order to ensure a sealing property around the injector, an annular shape is formed between the inner peripheral surface of the insertion hole portion and the injector. A seal material is attached, and the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head is in contact with the vicinity of the outer periphery of the insertion hole portion on the lower surface of the cam holder. In a state where the O-ring is fitted in the annular groove, the O-ring is mounted between the two peripheral portions.

こうしたシール構造により、外部から水やダストが挿通孔部やインジェクタホールを通って侵入することを防止し、動弁室からオイルが挿通孔部やインジェクタホールを通って漏出することを防止することができる。
特開2005-180277 This seal structure prevents water and dust from entering from the outside through the insertion hole and the injector hole, and prevents oil from leaking from the valve operating chamber through the insertion hole and the injector hole. it can.
JP2005-180277

特許文献１の直噴ディーゼルエンジンのシリンダヘッド構造では、シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とが当接しているため、これら両外周近傍部によってＯリングを圧縮状に装着し、Ｏリングを両外周近傍部に密着させてシール性を確保できるが、燃焼室の上側に位置するシリンダヘッドのインジェクタホールの外周近傍部には燃焼室での爆発に伴う大きな突き上げ力が作用し、その突き上げ力はカムホルダの挿通孔部の外周近傍部にダイレクトに繰り返し作用するため、この突き上げ力によってカムホルダに亀裂が生じるという虞がある。   In the cylinder head structure of the direct injection diesel engine of Patent Document 1, the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head is in contact with the vicinity of the outer periphery of the insertion hole portion on the lower surface of the cam holder. By attaching the O-ring in a compressed manner, the O-ring can be brought into close contact with both outer peripheral portions to ensure sealing performance, but the cylinder head injector hole located on the upper side of the combustion chamber has an outer peripheral portion in the combustion chamber. A large push-up force associated with the explosion acts, and the push-up force directly and repeatedly acts on the vicinity of the outer periphery of the insertion hole portion of the cam holder, so that the push-up force may cause a crack in the cam holder.

そこで、シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とを環状の間隙を空けて対面させることは考えられても、この間隙を設けたことによって、前記両外周近傍部により前記Ｏリングに十分なシール圧を加えることができないのでシール性を確保することが難しいという新たな問題が生じる。前記Ｏリングを大型化することも考えられるが、Ｏリングの装着性も悪くなり、結局、前記両外周近傍部間の十分なシール性を確保できないこと、等の課題が懸念される。   Therefore, even if it is conceivable that the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head and the vicinity of the outer periphery of the insertion hole portion on the lower surface of the cam holder face each other with an annular gap, by providing this gap, Since a sufficient sealing pressure cannot be applied to the O-ring by the two peripheral portions, a new problem arises that it is difficult to ensure sealing performance. Although it is conceivable to increase the size of the O-ring, the mounting performance of the O-ring is also deteriorated, and eventually there are concerns that a sufficient sealing performance between the two peripheral portions cannot be secured.

本発明の目的は、燃焼室での爆発に伴う大きな突き上げ力によってカムホルダに亀裂が生じることを防止すると共に、インジェクタの周囲の十分なシール性を確保することができる、直噴ディーゼルエンジンのシリンダヘッド構造を提供することである。   An object of the present invention is to prevent a cam holder from cracking due to a large thrust force caused by an explosion in a combustion chamber, and to ensure a sufficient sealing performance around an injector, and a cylinder head of a direct injection diesel engine Is to provide a structure.

請求項１の直噴ディーゼルエンジンのシリンダヘッド構造は、シリンダヘッドの上部にカムシャフトを配設し、このシリンダヘッドにインジェクタを貫通状に直立配置する直噴ディーゼルエンジンのシリンダヘッド構造において、前記シリンダヘッドの上面に開口しインジェクタが挿着されるインジェクタホールと、前記シリンダヘッドの上部を外部空間に対して油密に保持すると共に、前記インジェクタの上端部分が上方へ突出する開口部を有するシリンダヘッドカバーと、前記カムシャフトを回転自在に支持する複数気筒に対応する複数の軸受部と、これら軸受部を繋ぐ繋ぎ部と、この繋ぎ部に形成され前記インジェクタが挿通する挿通孔部とを有し、前記シリンダヘッドの上面に載置固定されたカムホルダと、前記カムホルダの挿通孔部と前記インジェクタとの間に配設される弾性のあるシール部材とを備え、前記シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とを環状の間隙を空けて対面させるように構成し、前記シール部材が、前記挿通孔部の内周面とインジェクタとの間に装着されるシール本体と、このシール本体の内方に形成され前記インジェクタに圧着される第１シール部と、シール本体から下方へ延びて前記挿入孔部よりも下方へ突出しシリンダヘッドの上面のインジェクタホールの外周近傍部に圧着される第２シール部と、この第２シール部の前記圧着による圧縮変形により拡径変形して前記挿通孔部の内周面に圧着される第３シール部とを有することを特徴とする。   2. The cylinder head structure of a direct injection diesel engine according to claim 1, wherein a camshaft is disposed at an upper portion of the cylinder head, and an injector is vertically arranged in the cylinder head in a penetrating manner. A cylinder head cover having an injector hole which is opened on the upper surface of the head and into which the injector is inserted, and an opening in which an upper end portion of the injector protrudes upward while holding an upper portion of the cylinder head in an oil-tight manner with respect to an external space And a plurality of bearing portions corresponding to a plurality of cylinders that rotatably support the camshaft, a connecting portion that connects these bearing portions, and an insertion hole portion that is formed in the connecting portion and through which the injector is inserted, A cam holder placed and fixed on the upper surface of the cylinder head, and an insertion hole of the cam holder; And an elastic seal member disposed between the injector and the injector, and an annular gap between the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head and the vicinity of the outer periphery of the insertion hole on the lower surface of the cam holder. The seal member is configured to be opposed to each other, and the seal member is formed between the inner peripheral surface of the insertion hole portion and the injector, and is formed inside the seal body and is pressure-bonded to the injector. A first seal portion, a second seal portion that extends downward from the seal body, projects downward from the insertion hole, and is crimped to the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head, and the second seal portion And a third seal portion that is expanded in diameter by compression deformation caused by pressure bonding and is pressure-bonded to the inner peripheral surface of the insertion hole portion.

この直噴ディーゼルエンジンのシリンダヘッド構造では、シリンダヘッドの上面にカムホルダが載置固定され、シリンダヘッドに形成されたインジェクタホールと、カムホルダに形成された挿通孔部とにインジェクタが挿着（挿通）されて、インジェクタがシリンダヘッドに貫通状に直立配置され、このインジェクタにより燃焼室に燃料が直接噴射される。シリンダヘッドの動弁室を含む上部がシリンダヘッドカバーにより外部空間に対して油密に保持され、このシリンダヘッドカバーに形成された開口部からインジェクタの上端部分が上方へ突出し、これより、インジェクタのメンテナンスにおける作業性、即ちサービス性が向上する。シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とが環状の間隙を空けて対面するように構成され、これにより、燃焼室の上側に位置するシリンダヘッドのインジェクタホールの外周近傍部には燃焼室での爆発に伴う大きな突き上げ力が作用するが、その突き上げ力がカムホルダの挿通孔部の外周近傍部にダイレクトに作用しなくなる。   In the cylinder head structure of the direct injection diesel engine, a cam holder is placed and fixed on the upper surface of the cylinder head, and the injector is inserted (inserted) into an injector hole formed in the cylinder head and an insertion hole formed in the cam holder. Thus, the injector is arranged upright in a penetrating manner in the cylinder head, and the fuel is directly injected into the combustion chamber by this injector. The upper part including the valve chamber of the cylinder head is oil tightly held by the cylinder head cover with respect to the external space, and the upper end portion of the injector protrudes upward from the opening formed in the cylinder head cover. Workability, that is, serviceability is improved. The cylinder head located on the upper side of the combustion chamber is configured such that the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head and the vicinity of the outer periphery of the insertion hole on the lower surface of the cam holder face each other with an annular gap therebetween. A large thrust force associated with the explosion in the combustion chamber acts on the vicinity of the outer periphery of the injector hole, but the thrust force does not act directly on the outer periphery of the insertion hole portion of the cam holder.

一方、インジェクタの周囲のシール性を確保するために、カムホルダの挿通孔部とインジェクタとの間に、弾性のあるシール本体と第１〜第３シール部を有するシール部材が配設されている。シール本体が、挿通孔部の内周面とインジェクタとの間に装着され、第１シール部が、シール本体の内方に形成されて、インジェクタに圧着され、第２シール部が、シール本体から下方へ延びて挿入孔部よりも下方へ突出して、シリンダヘッドの上面のインジェクタホールの外周近傍部に圧着され、第３シール部が、第２シール部の前記圧着による圧縮変形により拡径変形して挿通孔部の内周面に圧着される。こうして、シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部との間に環状の間隙を形成したうえで、シール部材により、インジェクタとカムホルダの間と、カムホルダとシリンダヘッドの間とが確実にシールされる。   On the other hand, in order to ensure the sealing performance around the injector, a seal member having an elastic seal body and first to third seal portions is disposed between the insertion hole portion of the cam holder and the injector. The seal main body is mounted between the inner peripheral surface of the insertion hole portion and the injector, the first seal portion is formed inside the seal main body, and is crimped to the injector, and the second seal portion is attached to the seal main body. It extends downward and protrudes downward from the insertion hole, and is crimped to the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head, and the third seal portion is expanded in diameter by the compressive deformation of the second seal portion due to the crimping. And is crimped to the inner peripheral surface of the insertion hole. In this way, an annular gap is formed between the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head and the vicinity of the outer periphery of the insertion hole portion on the lower surface of the cam holder. And the cylinder head are securely sealed.

ここで、請求項１の発明に次の構成を採用可能である。
前記カムホルダの下面の挿通孔部の外周近傍部をカムホルダの下面側から上端側へ後退させて前記間隙が形成される（請求項２）。前記シール本体の外周面と底面とに接着されると共に前記挿通孔部に内嵌される断面Ｌ形の環状基板を備え、この環状基板の下側に前記第３シール部が設けられ、この第３シール部の下側に前記第２シール部が設けられる（請求項３）。前記カムホルダは、その軸受部及び繋ぎ部が複数のボルトによりシリンダヘッドに締結される（請求項４）。 Here, the following configuration can be adopted in the invention of claim 1.
The gap is formed by retreating the vicinity of the outer periphery of the insertion hole on the lower surface of the cam holder from the lower surface side to the upper end side of the cam holder (Claim 2). An annular substrate having an L-shaped cross section that is adhered to the outer peripheral surface and the bottom surface of the seal body and fitted in the insertion hole portion is provided, and the third seal portion is provided below the annular substrate. The second seal portion is provided below the three seal portions. The cam holder has a bearing portion and a connecting portion fastened to the cylinder head by a plurality of bolts.

請求項１の直噴ディーゼルエンジンのシリンダヘッド構造によれば、シリンダヘッドの上面にカムホルダを載置固定し、シリンダヘッドのインジェクタホールとカムホルダの挿通孔部とにインジェクタを挿着（挿通）して、インジェクタをシリンダヘッドに貫通状に直立配置したものであり、シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とを環状の間隙を空けて対面させるように構成したので、燃焼室の上側に位置するシリンダヘッドのインジェクタホールの外周近傍部には、燃焼室での爆発に伴う大きな突き上げ力が作用するが、その突き上げ力がカムホルダの挿通孔部の外周近傍部にダイレクトに不要に作用しないため、カムホルダの耐久性を高めて、カムホルダに亀裂が生じることを確実に防止できる。   According to the cylinder head structure of the direct injection diesel engine of claim 1, the cam holder is placed and fixed on the upper surface of the cylinder head, and the injector is inserted (inserted) into the injector hole of the cylinder head and the insertion hole portion of the cam holder. The injector is vertically arranged in the cylinder head so as to penetrate the cylinder head so that the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head and the vicinity of the outer periphery of the insertion hole on the lower surface of the cam holder face each other with an annular gap. Therefore, a large thrust force due to the explosion in the combustion chamber acts on the vicinity of the outer periphery of the injector hole of the cylinder head located above the combustion chamber, and the thrust force is the outer periphery of the insertion hole portion of the cam holder. Since it does not act unnecessarily directly in the vicinity, the durability of the cam holder is increased and the cam holder is cracked. Door can be reliably prevented.

前記間隙を形成することにより、特許文献１のようなＯリングでは前記両外周近傍部間のシール性を確保することが難しいが、カムホルダの挿通孔部とインジェクタとの間に、弾性のあるシール本体と第１〜第３シール部を有するシール部材を配設し、シール本体を挿通孔部の内周面とインジェクタとの間に装着し、第１シール部をシール本体の内方に形成してインジェクタに圧着させ、第２シール部をシール本体から下方へ延びて挿入孔部よりも下方へ突出させてシリンダヘッドの上面のインジェクタホールの外周近傍部に圧着させ、第３シール部を第２シール部の前記圧着による圧縮変形により拡径変形させて挿通孔部の内周面に圧着させたので、シリンダヘッドの上面のインジェクタホールの外周近傍部にシール装着用の加工を施すこともなく、インジェクタとカムホルダの間と、カムホルダとシリンダヘッドの間とを確実にシールできる。つまり、このシール部材により、前記間隙を形成したうえで、インジェクタの周囲の十分なシール性を確保でき、外部から水やダストが挿通孔部やインジェクタホールを通って侵入することを確実に防止でき、動弁室からオイルが挿通孔部やインジェクタホールを通って漏出することを確実に防止できる。   By forming the gap, it is difficult for the O-ring as in Patent Document 1 to ensure the sealing performance between the peripheral portions, but there is an elastic seal between the insertion hole of the cam holder and the injector. A seal member having a main body and first to third seal portions is disposed, the seal main body is mounted between the inner peripheral surface of the insertion hole portion and the injector, and the first seal portion is formed inside the seal main body. The second seal portion extends downward from the seal main body and protrudes downward from the insertion hole portion, and is crimped to the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head, and the third seal portion is attached to the second seal portion. Since the diameter of the seal portion is increased by compressive deformation due to the above-described pressure bonding and is crimped to the inner peripheral surface of the insertion hole portion, a seal mounting process is applied to the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head. Without any, can be reliably sealed and between the injector and the cam holder, and between the cam holder and the cylinder head. In other words, with this seal member, the gap can be formed and a sufficient sealing performance around the injector can be secured, and water and dust can be reliably prevented from entering from the outside through the insertion hole portion and the injector hole. The oil can be reliably prevented from leaking from the valve operating chamber through the insertion hole and the injector hole.

請求項２の直噴ディーゼルエンジンのシリンダヘッド構造によれば、カムホルダの下面の挿通孔部の外周近傍部をカムホルダの下面側から上端側へ後退させて前記間隙を形成したので、カムホルダの形状を少し変更することにより、シリンダヘッドの上面のインジェクタホールの外周近傍部をフラットな面に形成して、前記間隙を容易に製作コストを高めることなく形成することができる。 According to the cylinder head structure of the direct injection diesel engine of claim 2, the outer peripheral vicinity of the insertion hole portion on the lower surface of the cam holder is retreated from the lower surface side of the cam holder to the upper end side, so that the gap is formed. By slightly changing, the outer peripheral vicinity of the injector hole on the upper surface of the cylinder head can be formed into a flat surface, and the gap can be easily formed without increasing the manufacturing cost.

請求項３の直噴ディーゼルエンジンのシリンダヘッド構造によれば、シール本体の外周面と底面とに接着されると共に挿通孔部に内嵌される断面Ｌ形の環状基板を備え、この環状基板の下側に第３シール部を設け、この第３シール部の下側に第２シール部を設けたので、シール本体と第１〜第３シール部を有するシール部材の一体性を高め、シール部材の保持性と共に第１〜第３シール部によるシール性を安定化させることができる。   According to the cylinder head structure of a direct injection diesel engine according to claim 3, an annular substrate having an L-shaped cross section that is adhered to the outer peripheral surface and the bottom surface of the seal body and is fitted into the insertion hole portion is provided. Since the third seal part is provided on the lower side and the second seal part is provided on the lower side of the third seal part, the integrity of the seal body and the seal member having the first to third seal parts is improved, and the seal member It is possible to stabilize the sealing performance by the first to third sealing portions as well as the holding performance.

請求項４の直噴ディーゼルエンジンのシリンダヘッド構造によれば、カムホルダは、その軸受部及び繋ぎ部が複数のボルトによりシリンダヘッドに締結されるので、シリンダヘッドの上面にカムホルダを安定して載置固定することができる。   According to the cylinder head structure of the direct injection diesel engine of claim 4, since the bearing portion and the connecting portion of the cam holder are fastened to the cylinder head by the plurality of bolts, the cam holder is stably placed on the upper surface of the cylinder head. Can be fixed.

本発明の直噴ディーゼルエンジンのシリンダヘッド構造は、シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とを環状の間隙を空けて対面させて、カムホルダの挿通孔部とインジェクタとの間に弾性のあるシール部材を配設し、そのシール部材が、挿通孔部の内周面とインジェクタとの間に装着されるシール本体と、シール本体の内方に形成されインジェクタに圧着される第１シール部と、シール本体から下方へ延びて挿入孔部よりも下方へ突出しシリンダヘッドの上面のインジェクタホールの外周近傍部に圧着される第２シール部と、第２シール部の前記圧着による圧縮変形により拡径変形して挿通孔部の内周面に圧着される第３シール部とを有する。   The cylinder head structure of the direct injection diesel engine according to the present invention is configured such that the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head and the vicinity of the outer periphery of the insertion hole on the lower surface of the cam holder face each other with an annular gap therebetween. An elastic seal member is disposed between the insertion hole portion and the injector, and the seal member is mounted between the inner peripheral surface of the insertion hole portion and the injector, and inward of the seal body. A first seal portion that is formed and crimped to the injector, a second seal portion that extends downward from the seal body, projects downward from the insertion hole, and is crimped to the vicinity of the outer periphery of the injector hole on the top surface of the cylinder head, And a third seal portion that is expanded in diameter by compression deformation due to the above-described pressure bonding of the two seal portions and is pressure-bonded to the inner peripheral surface of the insertion hole portion.

図１は直噴ディーゼルエンジン１のシリンダヘッド構造２の全体の平面図、図２はシリンダヘッド構造２のシリンダヘッドカバー３０とインジェクタ４０とシール部材６０等を取り外した状態の平面図、図３はシリンダヘッド構造２の図２の状態から更にカムホルダ２０とカムシャフト８，９等を取り外した状態の平面図、図４は図１のIV−IV線断面図、図５は図４のＶ−Ｖ線断面図であり、この直噴ディーゼルエンジン１は、その長手方向に４つの気筒３を並設し、これら気筒３の燃焼室に燃料を直接噴射する直列４気筒エンジンである。以下、図１〜図３、図５の矢視ａの方向を前方として説明する。   1 is a plan view of the entire cylinder head structure 2 of the direct injection diesel engine 1, FIG. 2 is a plan view of the cylinder head structure 2 with a cylinder head cover 30, an injector 40, a seal member 60, etc. removed, and FIG. FIG. 4 is a plan view of the head structure 2 with the cam holder 20 and the camshafts 8 and 9 removed from the state shown in FIG. 2, FIG. 4 is a sectional view taken along line IV-IV in FIG. 1, and FIG. FIG. 2 is a cross-sectional view, and the direct injection diesel engine 1 is an in-line four-cylinder engine in which four cylinders 3 are arranged in the longitudinal direction and fuel is directly injected into the combustion chambers of the cylinders 3. Hereinafter, the direction of arrow a in FIGS. 1 to 3 and 5 will be described as the front.

図１〜図５に示すように、直噴ディーゼルエンジン１のシリンダヘッド構造２は、シリンダヘッド１０の上部に左右１対の前後方向に長いカムシャフト８，９を配設し、シリンダヘッド１０に、４つの気筒３の燃焼室に夫々燃料を直接噴射する４つのインジェクタ４０を貫通状に直立配置したものである。   As shown in FIGS. 1 to 5, the cylinder head structure 2 of the direct-injection diesel engine 1 includes a pair of left and right camshafts 8 and 9 disposed in the upper part of the cylinder head 10. Four injectors 40 that directly inject fuel into the combustion chambers of the four cylinders 3 are vertically arranged in a penetrating manner.

シリンダヘッド構造２は、シリンダヘッド１０の上面に開口し４つのインジェクタ４０が夫々挿着される４つの鉛直なインジェクタホール１４と、シリンダヘッド１０の上部を外部空間に対して油密に保持すると共に４つのインジェクタ４０の上端部分が上方へ突出する開口部３３を有するシリンダヘッドカバー３０と、１対のカムシャフト８，９を回転自在に支持すると共に４つのインジェクタ４０が夫々挿通する４つの鉛直な挿通孔部２４が形成されてシリンダヘッド１０の上面に載置固定されたカムホルダ２０と、カムホルダ２０の４つの挿通孔部２４と４つのインジェクタ４０との間に夫々配設された弾性のある４つのシール部材６０等を備えている。   The cylinder head structure 2 has four vertical injector holes 14 which are opened on the upper surface of the cylinder head 10 and into which the four injectors 40 are respectively inserted, and the upper portion of the cylinder head 10 is oil-tightly held with respect to the external space. The cylinder head cover 30 having an opening 33 projecting upward from the upper end portions of the four injectors 40, and four vertical insertions through which the four injectors 40 are inserted while rotatably supporting the pair of camshafts 8 and 9, respectively. The cam holder 20 which is formed with the hole 24 and is placed and fixed on the upper surface of the cylinder head 10, and the four elastic holes disposed between the four insertion holes 24 and the four injectors 40 of the cam holder 20. A seal member 60 and the like are provided.

図３〜図５に示すように、シリンダヘッド１０には、ウォータジャケット１１が形成され、ウォータジャケット１１と動弁室４とを区画するミドルデッキ１２が形成され、ミドルデッキ１２から上方へ突出する４つのボス部１３が一体形成されている。４つのボス部１３は、４つの気筒３の燃焼室の上側に位置するように、シリンダヘッド１０の左右方向中央部において前後方向に間隔を空けて並設されている。４つのインジェクタホール１４は、４つのボス部１３の平滑な上面に夫々開口するように、対応する気筒３の中心線に中心を合わせて、ミドルデッキ１２とボス部１３に上下貫通状に形成されている。インジェクタホール１４は、その上部を含む大部分を占める大径孔部１４ａと、大径孔部１４ａの下端部から段部１４ｃを介して形成され下方へ延びる小径孔部１４ｂとからなる。   As shown in FIGS. 3 to 5, a water jacket 11 is formed in the cylinder head 10, a middle deck 12 that partitions the water jacket 11 and the valve operating chamber 4 is formed, and protrudes upward from the middle deck 12. Four boss portions 13 are integrally formed. The four boss portions 13 are arranged side by side in the front-rear direction at the center in the left-right direction of the cylinder head 10 so as to be positioned above the combustion chambers of the four cylinders 3. The four injector holes 14 are formed in the middle deck 12 and the boss portion 13 so as to penetrate vertically, centering on the center line of the corresponding cylinder 3 so as to open on the smooth upper surfaces of the four boss portions 13, respectively. ing. The injector hole 14 includes a large-diameter hole portion 14a that occupies a large portion including the upper portion thereof, and a small-diameter hole portion 14b that is formed from the lower end portion of the large-diameter hole portion 14a via the stepped portion 14c and extends downward.

シリンダヘッド１０のミドルデッキ１２には、４つのインジェクタ４０を固定する４つのボルト５９が螺合される４つのボルトネジ孔１５と、カムホルダ２０を固定する複数のボルト２９が螺合される複数のボルトネジ孔１６が形成され、各ボルトネジ孔１５は各インジェクタホール１４の後側に設けられ、各ボルトネジ孔１５の後側近傍の左右両側にボルトネジ孔１６が２つずつ設けられている。シリンダヘッド１０の外周部には、ミドルデッキ１２から上方へ延びる外周壁部１７が全周に亙って一体形成され、外周壁部１７には、シリンダヘッドカバー３０の外周壁部３１を固定する複数の締結部材３２が螺合される複数の締結孔１８が形成されている。   The middle deck 12 of the cylinder head 10 has four bolt screw holes 15 into which four bolts 59 for fixing the four injectors 40 are screwed, and a plurality of bolt screws to which a plurality of bolts 29 for fixing the cam holder 20 are screwed. Holes 16 are formed, each bolt screw hole 15 is provided on the rear side of each injector hole 14, and two bolt screw holes 16 are provided on both the left and right sides in the vicinity of the rear side of each bolt screw hole 15. An outer peripheral wall portion 17 extending upward from the middle deck 12 is integrally formed on the outer peripheral portion of the cylinder head 10 over the entire periphery, and a plurality of outer peripheral wall portions 31 of the cylinder head cover 30 are fixed to the outer peripheral wall portion 17. A plurality of fastening holes 18 into which the fastening members 32 are screwed are formed.

図６はカムホルダ２０の平面図である。図２、図４〜図６に示すように、カムホルダ２０は、１対のカムシャフト８，９を夫々回転自在に支持する４気筒に対応する左右５対の軸受部２１と、複数の軸受部２１を繋ぐ繋ぎ部２２とを有する。複数の軸受部２１と繋ぎ部２２は一体形成されている。繋ぎ部２２は前後方向に延びてシリンダヘッド１０の前後長よりも少し短く形成され、繋ぎ部２２には、前後方向に長い凹部２３が上側から形成され、凹部２３の平滑な底面に開口する４つの挿通孔部２４が、前後方向に間隔を空けて上下貫通状に形成されている。   FIG. 6 is a plan view of the cam holder 20. As shown in FIGS. 2 and 4 to 6, the cam holder 20 includes a pair of left and right bearings 21 corresponding to four cylinders that rotatably support a pair of camshafts 8 and 9, and a plurality of bearings. 21 and a connecting portion 22 that connects 21. The plurality of bearing portions 21 and the connecting portion 22 are integrally formed. The connecting portion 22 extends in the front-rear direction and is formed slightly shorter than the front-rear length of the cylinder head 10. The connecting portion 22 is formed with a concave portion 23 that is long in the front-rear direction from the upper side and opens on the smooth bottom surface of the concave portion 4. Two insertion holes 24 are formed in a vertically penetrating manner with a space in the front-rear direction.

５対の軸受部２１のうちの前後両端の軸受部２１が４つの挿通孔部２４よりも前後両側に位置するように、５対の軸受部２１が、４つの挿通孔部２４に対して前後方向にシフトした位置の繋ぎ部２２から左右両側に張り出すように形成されている。繋ぎ部２２には、各挿通孔部２４の後側に前記ボルト５９が挿通されるボルト挿通孔２６が形成され、各ボルト挿通孔２６の後側にホルダ支持部２７が凸状に形成され、各ホルダ支持部２７に位置決めピン５５が上方突出状に内嵌されるピン穴２７ａが形成されている。   The five pairs of bearing portions 21 are front and rear with respect to the four insertion hole portions 24 so that the bearing portions 21 at both front and rear ends of the five pairs of bearing portions 21 are positioned on both front and rear sides of the four insertion hole portions 24. It is formed so as to protrude from the connecting portion 22 at the position shifted in the direction to the left and right sides. The connecting portion 22 is formed with a bolt insertion hole 26 through which the bolt 59 is inserted on the rear side of each insertion hole portion 24, and a holder support portion 27 is formed in a convex shape on the rear side of each bolt insertion hole 26, Each holder support portion 27 is formed with a pin hole 27a into which the positioning pin 55 is fitted so as to protrude upward.

５対の合計１０つの軸受部２１には、夫々、上側から軸受キャップ２５が当接されて前記ボルト２９により固定され、左側（右側）の複数の軸受部２１及び軸受キャップ２５により、カムシャフト８（９）が回転自在に支持されている。複数のボルト２９により、カムホルダ２０の複数の軸受部２１と複数の軸受キャップ２５がシリンダヘッド１０に共締めされて固定され、こうして、カムホルダ２０がシリンダヘッド１０に定位置で載置固定されて、複数の挿通孔部２４の中心が対応する気筒３の中心線に一致し、これら挿通孔部２４がシリンダヘッド１０の複数のインジェクタホール１４に夫々連通状態になる。   A bearing cap 25 is brought into contact with the bearings 25 from the upper side and fixed by the bolts 29 to a total of ten bearing portions 21 in five pairs, and the camshaft 8 is fixed by a plurality of bearing portions 21 and bearing caps 25 on the left side (right side). (9) is rotatably supported. The plurality of bearings 21 and the plurality of bearing caps 25 of the cam holder 20 are fastened together and fixed to the cylinder head 10 by the plurality of bolts 29, and thus the cam holder 20 is placed and fixed on the cylinder head 10 at a fixed position. The centers of the plurality of insertion holes 24 coincide with the center lines of the corresponding cylinders 3, and these insertion holes 24 are in communication with the plurality of injector holes 14 of the cylinder head 10.

図９はカムホルダ２０とシリンダヘッド１０の挿通孔部２４とインジェクタホール１４の一部を含む要部の断面図を示している。図４、図５、図９に示すように、挿通孔部２４はシリンダヘッド１０のインジェクタホール１４（大径孔部１４ａ）よりも大径に形成され、詳細には、挿通孔部２４には、その上端から下側に向かって順に、最大径の上端穴部２４ａ、上端穴部２４ａよりも小径の上穴部２４ｂ、上穴部２４ｂの下端から下方に向かって小径化するテーパ穴部２４ｃ、テーパ穴部２４ｃの下端の径と同径の主孔部２４ｄが形成され、主孔部２４ｄが挿通孔部２４の上下長の約２／３の上下長を有する。   FIG. 9 shows a cross-sectional view of the main part including a part of the cam holder 20, the insertion hole 24 of the cylinder head 10 and the injector hole 14. As shown in FIGS. 4, 5, and 9, the insertion hole portion 24 is formed to have a larger diameter than the injector hole 14 (large diameter hole portion 14 a) of the cylinder head 10. In order from the upper end to the lower side, the upper end hole portion 24a having the maximum diameter, the upper hole portion 24b having a smaller diameter than the upper end hole portion 24a, and the tapered hole portion 24c having a diameter decreasing downward from the lower end of the upper hole portion 24b. A main hole 24d having the same diameter as that of the lower end of the tapered hole 24c is formed, and the main hole 24d has a vertical length that is about 2/3 of the vertical length of the insertion hole 24.

シリンダヘッド１０のボス部１３の上面がフラットに形成されるのに対して、カムホルダ２０の下面の挿通孔部２４の外周近傍部２０ａが、カムホルダ２０の下面（外周近傍部２０ａの外周外側の下面）から環状に段上げ状に形成されて、つまり、カムホルダ２０の下面側から上端側へ後退して、シリンダヘッド１０（ボス部１３）の上面のインジェクタホール１４の外周近傍部１０ａと前記外周近傍部２０ａとの間に、インジェクタホール１４の約２倍程度の径の環状の間隙５が形成され、前記外周近傍部１０ａ，２０ａ同士が間隙５を空けて対面するように構成されている。 Whereas the upper surface of the boss 13 of the cylinder head 10 is formed flat, the outer peripheral vicinity 20a of the insertion hole 24 on the lower surface of the cam holder 20 is the lower surface of the cam holder 20 (the lower outer surface of the outer peripheral vicinity 20a). ) From the lower surface side of the cam holder 20 to the upper end side, and the vicinity of the outer periphery 10a of the injector hole 14 on the upper surface of the cylinder head 10 (boss portion 13) and the vicinity of the outer periphery. An annular gap 5 having a diameter of about twice that of the injector hole 14 is formed between the portion 20a and the outer peripheral vicinity portions 10a and 20a are opposed to each other with the gap 5 therebetween.

図１、図４に示すように、シリンダヘッドカバー３０は下側が開口する箱状に形成され、シリンダヘッド１０に上方から取り付けられて、その外周壁部３１の下端面がシリンダヘッド１０の外周壁部１７の上端面にシール材３２を介して油密に接続されると共に、前記複数の締結部材３２によりに締結されている。シリンダヘッドカバー３０の左右方向中央部に前後方向へ延びるスリット状の開口部３３が形成され、開口部３３からカムホルダ２０の繋ぎ部２２の凹部２３の全体が外部へ露出している。   As shown in FIGS. 1 and 4, the cylinder head cover 30 is formed in a box shape having an opening on the lower side, and is attached to the cylinder head 10 from above, and the lower end surface of the outer peripheral wall portion 31 is the outer peripheral wall portion of the cylinder head 10. 17 is oil-tightly connected to the upper end surface of the member 17 via a sealing material 32 and fastened by the plurality of fastening members 32. A slit-like opening 33 extending in the front-rear direction is formed at the center in the left-right direction of the cylinder head cover 30, and the entire recess 23 of the connecting portion 22 of the cam holder 20 is exposed to the outside from the opening 33.

シリンダヘッドカバー３０の開口部３３を形成する内周壁部３４の下端面が、カムホルダ２０の繋ぎ部２２の溝部２３の外周外側の上面にシール材３５を介して油密に接続されている。こうして、シリンダヘッドカバー３０により、その開口部３３からカムホルダ２０の繋ぎ部２２の凹部２３を外部へ露出させた状態で、シリンダヘッド１０の動弁室４を含む上部が、カムホルダ２０の凹部２３以外の部分と１対のカムシャフト８，９と共に、外部空間に対して油密に保持されている。   The lower end surface of the inner peripheral wall portion 34 that forms the opening 33 of the cylinder head cover 30 is oil-tightly connected to the upper surface of the outer periphery of the groove portion 23 of the connecting portion 22 of the cam holder 20 via a sealing material 35. Thus, with the cylinder head cover 30, the upper part including the valve operating chamber 4 of the cylinder head 10 other than the concave part 23 of the cam holder 20 is exposed in the state where the concave part 23 of the connecting part 22 of the cam holder 20 is exposed to the outside from the opening 33. Along with the part and the pair of camshafts 8 and 9, the outer space is held oil-tight.

図１、図４、図５、図７に示すように、各インジェクタ４０は、上部に燃料導入部４０ａを有すると共に下端部に燃料噴射口４０ｂを有する。また、インジェクタ４０には、上下方向中央部よりも少し上側に断面が略矩形状となるように凹んだ細頸部をなすホルダ係合部４１が形成され、そのホルダ係合部４１の下端部の鍔部４２の下側にインジェクタ４０の上下長の約１／２の上下長の大径筒部４３が形成され、大径筒部４３の下端部から段部４５を介して小径筒部４４が形成されて下方へ突出し、小径筒部４４に燃料噴射口４０ｂが設けられている。   As shown in FIGS. 1, 4, 5, and 7, each injector 40 has a fuel introduction part 40 a at the upper part and a fuel injection port 40 b at the lower end part. In addition, the injector 40 is formed with a holder engaging portion 41 having a narrow neck portion that is recessed so that its cross section is substantially rectangular, slightly above the central portion in the vertical direction, and a lower end portion of the holder engaging portion 41 A large-diameter cylindrical portion 43 that is approximately ½ of the vertical length of the injector 40 is formed below the flange portion 42, and the small-diameter cylindrical portion 44 is formed from the lower end portion of the large-diameter cylindrical portion 43 through the step portion 45. Is formed and protrudes downward, and a fuel injection port 40 b is provided in the small diameter cylindrical portion 44.

インジェクタ４０は、カムホルダ２０の挿通孔部２４及びシリンダヘッド１０のインジェクタホール１４に上側から着脱自在に挿着され、その段部４５がインジェクタホール１４の段部１４ｃに上側から当接して上下方向に位置決めされて、インジェクタ４０の上端部分がシリンダヘッドカバー３０の開口部３３から上方へ突出すると共に、燃料噴射口１４ｂが気筒３の燃焼室に臨み、この状態で、次に説明する固定機構５０によりインジェクタ４０が固定解除可能に固定されている。   The injector 40 is detachably inserted from above into the insertion hole 24 of the cam holder 20 and the injector hole 14 of the cylinder head 10, and its step 45 abuts on the step 14 c of the injector hole 14 from above and moves vertically. After being positioned, the upper end portion of the injector 40 protrudes upward from the opening 33 of the cylinder head cover 30, and the fuel injection port 14b faces the combustion chamber of the cylinder 3. In this state, the injector is fixed by the fixing mechanism 50 described below. 40 is fixed so as to be unlockable.

図１、図４、図５、図８に示すように、固定機構５０は、インジェクタホルダ５１と前記ボルト５９を有する。インジェクタホルダ５１には、前部に二股状のアーム部５２が形成され、後端部に支点部５３が形成され、前後方向中央部にボルト挿通孔５４が形成されている。アーム部５２がインジェクタ４０のホルダ係合部４１に係合され、支点部５３がカムホルダ２０のホルダ支持部２７に位置決めピン５５により位置決めされた状態で載置支持されている。ボルト挿通孔５４にボルト５９が上側から挿通されると共に、このボルト５９はカムホルダ２０のボルト挿通孔２６に遊嵌状に挿通され、その下端部分がシリンダヘッド１０のボルトネジ孔１５に螺合されている。   As shown in FIGS. 1, 4, 5, and 8, the fixing mechanism 50 includes an injector holder 51 and the bolt 59. The injector holder 51 has a bifurcated arm portion 52 at the front, a fulcrum 53 at the rear end, and a bolt insertion hole 54 at the center in the front-rear direction. The arm portion 52 is engaged with the holder engaging portion 41 of the injector 40, and the fulcrum portion 53 is placed and supported on the holder support portion 27 of the cam holder 20 in a state of being positioned by the positioning pin 55. A bolt 59 is inserted into the bolt insertion hole 54 from above, and the bolt 59 is inserted into the bolt insertion hole 26 of the cam holder 20 in a loosely fitting manner, and a lower end portion thereof is screwed into the bolt screw hole 15 of the cylinder head 10. Yes.

ボルト５９を締めることにより、インジェクタホルダ５１において、支点部５３を支点としてアーム部５２に下方回動力が作用するため、アーム部５２により鍔部４２と共にインジェクタ４０が下方へ押圧されて、インジェクタ４０が、その段部４５をインジェクタホール１４の段部１４ｃに圧着させた状態で固定され、更に、複数のボルト５９により、インジェクタホルダ５１を介してカムホルダ２０の繋ぎ部２２がシリンダヘッド１０にされている。尚、カムホルダ２０の上面のボルト挿通孔２６の外周近傍部と、インジェクタホルダ５１の下面及びボルト５９の間が環状シール材５６によりシールされている。   By tightening the bolt 59, the downward rotating force acts on the arm portion 52 with the fulcrum portion 53 as a fulcrum in the injector holder 51. Therefore, the injector 40 is pressed downward together with the flange portion 42 by the arm portion 52, and the injector 40 The step portion 45 is fixed in a state where it is crimped to the step portion 14 c of the injector hole 14, and the connecting portion 22 of the cam holder 20 is made into the cylinder head 10 via the injector holder 51 by a plurality of bolts 59. . An annular seal material 56 seals the vicinity of the outer periphery of the bolt insertion hole 26 on the upper surface of the cam holder 20 and the lower surface of the injector holder 51 and the bolt 59.

ここで、インジェクタホルダ５１はカムホルダ２０の凹部２３に装着されて、インジェクタホルダ５１及びボルト５９が、シリンダヘッドカバー３０の開口部３３から外部空間に臨んだ状態となり、シリンダヘッドカバー３０を装着した状態で、固定機構５０の固定・固定解除操作、及び、インジェクタ４０と固定機構５０の着脱作業が可能になり、故に、インジェクタ４０のメンテナンスにおける作業性、即ちサービス性が向上する。   Here, the injector holder 51 is mounted in the recess 23 of the cam holder 20, and the injector holder 51 and the bolt 59 face the external space from the opening 33 of the cylinder head cover 30, and the cylinder head cover 30 is mounted. The fixing mechanism 50 can be fixed and released, and the injector 40 and the fixing mechanism 50 can be attached and detached. Therefore, the workability in maintenance of the injector 40, that is, the serviceability is improved.

次に、シール部材６０について説明する。
図１０はシール部材６０の断面図、図１１はシール部材６０を挿通孔部２４に装着した状態の要部の断面図、図１２はインジェクタ４０がシール部材６０を介して挿通孔部２４とインジェクタホール１４に挿通された状態の断面図を示し、前記のように、シール部材６０は、カムホルダ２０の挿通孔部２４とインジェクタ４０との間に配設されている。 Next, the seal member 60 will be described.
10 is a cross-sectional view of the seal member 60, FIG. 11 is a cross-sectional view of the main part in a state where the seal member 60 is mounted in the insertion hole 24, and FIG. 12 is a cross-sectional view of the injector 40 through the seal member 60. The sectional view in a state of being inserted through the hole 14 is shown. As described above, the seal member 60 is disposed between the insertion hole portion 24 of the cam holder 20 and the injector 40.

図４、図５、図１０〜図１２に示すように、シール部材６０は、カムホルダ２０の挿通孔部２４の内周面とインジェクタ４０との間に装着されるシール本体６１と、シール本体６１の内方に形成されインジェクタ４０に圧着される第１シール部６２と、シール本体６１から下方へ延びて挿入孔部２４よりも下方へ突出しシリンダヘッド１０の上面のインジェクタホール１４の外周近傍部１０ａに圧着される第２シール部６３と、第２シール部６３の前記圧着による圧縮変形により拡径変形してカムホルダ２０の挿通孔部２４の内周面に圧着される第３シール部６４とを有し、これらシール本体６１と第１〜第３シール部６２〜６４は夫々環状に形成されている。   As shown in FIGS. 4, 5, and 10 to 12, the seal member 60 includes a seal body 61 that is mounted between the inner peripheral surface of the insertion hole 24 of the cam holder 20 and the injector 40, and a seal body 61. A first seal portion 62 that is formed inwardly of the cylinder head 10 and is crimped to the injector 40, and extends downward from the seal main body 61 and protrudes downward from the insertion hole portion 24. A second seal portion 63 that is crimped to the second seal portion, and a third seal portion 64 that is expanded in diameter by compression deformation due to the crimping of the second seal portion 63 and is crimped to the inner peripheral surface of the insertion hole portion 24 of the cam holder 20. The seal main body 61 and the first to third seal portions 62 to 64 are each formed in an annular shape.

また、シール本体６１の外周面と底面とに接着されると共にカムホルダ２０の挿通孔部２４に内嵌される断面Ｌ形のスチール又はステンレス等の金属製の環状基板６５が備えられ、この環状基板６５の下側に第３シール部６４が設けられ、第３シール部６４の下側に第２シール部６３が設けられている。ここで、シール部材６０と環状基板６５について詳細に説明する。   Further, an annular substrate 65 made of metal such as steel or stainless steel having an L-shaped cross section that is adhered to the outer peripheral surface and the bottom surface of the seal body 61 and is fitted into the insertion hole portion 24 of the cam holder 20 is provided. A third seal portion 64 is provided below 65, and a second seal portion 63 is provided below the third seal portion 64. Here, the seal member 60 and the annular substrate 65 will be described in detail.

環状基板６５は、筒部６５ａと、筒部６５ａの上端から径方向外側へ突出する環状のフランジ部６５ｂと、筒部６５ａの下端から径方向内側へ張り出すテーパ部６５ｂを含む環状の内方張出部６５ｃからなり、筒部６５ａとフランジ部６５ｂと内方張出部６５ｃはプレス成形等で一体形成されている。筒部６５ａは、挿通孔部２４の主孔部２４ｄと略同径に形成されて、挿通孔部２４の上下長の約２／３の上下長を有し、フランジ部６５ｂの外周部は挿通孔部２４の上端穴部２４ａの径以下の径に形成され、内方張出部６５ｃの内周部はインジェクタホール１４の大径孔部１４ａの径以下の径に形成されている。   The annular substrate 65 includes an annular inner portion including a tubular portion 65a, an annular flange portion 65b protruding radially outward from the upper end of the tubular portion 65a, and a tapered portion 65b projecting radially inward from the lower end of the tubular portion 65a. The cylinder portion 65a, the flange portion 65b, and the inward projection portion 65c are integrally formed by press molding or the like. The cylindrical portion 65a is formed to have substantially the same diameter as the main hole portion 24d of the insertion hole portion 24, and has a vertical length that is about 2/3 of the vertical length of the insertion hole portion 24, and the outer peripheral portion of the flange portion 65b is inserted therethrough. The hole 24 is formed to have a diameter equal to or smaller than the diameter of the upper end hole 24 a, and the inner peripheral portion of the inwardly extending portion 65 c is formed to have a diameter equal to or smaller than the diameter of the large-diameter hole 14 a of the injector hole 14.

シール部材６０において、シール本体６１と第１シール部６２が一体形成され、これらの別体として、第２シール部６３と第３シール部６４が一体形成され、環状基板６５の筒部６５ａの内周面と内方張出部６５ｃの上面にシール本体６１の外周面と底面が接着され、内方張出部６５ｃの下面に第２シール部６３の上面が接着されて、シール本体６１と第１〜第３シール部６２〜６４とを一体化したシール部材６０が構成されている。   In the seal member 60, the seal body 61 and the first seal portion 62 are integrally formed, and as a separate body, the second seal portion 63 and the third seal portion 64 are integrally formed, and the inside of the cylindrical portion 65 a of the annular substrate 65 is formed. The outer peripheral surface and the bottom surface of the seal body 61 are bonded to the peripheral surface and the upper surface of the inwardly extending portion 65c, and the upper surface of the second seal portion 63 is bonded to the lower surface of the inwardly extending portion 65c. A seal member 60 in which the first to third seal portions 62 to 64 are integrated is configured.

シール本体６１は、インジェクタ４０の大径筒部４３が僅かな隙間を以て挿通可能な比較的厚肉の筒状に形成され、前記のように環状基板６５に接着された状態で、その上端位置を環状基板６５のフランジ部６５ａの上端と一致させると共に、その内周端位置を環状基板６５の内方張出部６５ｃの内周端と一致させるように形成され、第１シール部６２は、シール本体６１の内周部の上下方向中央部から内方へ突出するように形成されている。   The seal body 61 is formed in a relatively thick cylindrical shape in which the large-diameter cylindrical portion 43 of the injector 40 can be inserted with a slight gap, and the upper end position of the seal main body 61 is fixed to the annular substrate 65 as described above. The first sealing portion 62 is formed so as to coincide with the upper end of the flange portion 65a of the annular substrate 65 and to align the inner peripheral end position with the inner peripheral end of the inwardly extending portion 65c of the annular substrate 65. The main body 61 is formed so as to protrude inward from the central portion in the vertical direction of the inner peripheral portion.

第２，第３シール部６３，６４は全体的にシール本体６１の上下長の約半分の上下長を有し、第３シール部６４は、その上端部がシール本体６１の径方向厚さと略同じ厚さを有し、内方張出部６５ｃの下面に全体的に接着され、第３シール部６４と第２シール部６３の内周面は連続的に下方程大径化するテーパ内周面に形成されている。第２シール部６３の下端部の径方向厚さはシール本体６１の径方向厚さよりも小さく、第２シール部６３の外周面は上方程大径化するテーパ外周面に形成され、そのテーパ外周面の上端が径方向外側へ張り出す段部を介して第３シール部６４の略ストレート状の外周面に繋がっている。   The second and third seal portions 63 and 64 generally have a vertical length that is approximately half of the vertical length of the seal body 61, and the upper end portion of the third seal portion 64 is approximately equal to the radial thickness of the seal body 61. Tapered inner circumference which has the same thickness and is entirely bonded to the lower surface of the inwardly extending portion 65c, and the inner peripheral surfaces of the third seal portion 64 and the second seal portion 63 continuously increase in diameter toward the lower side. Formed on the surface. The radial thickness of the lower end portion of the second seal portion 63 is smaller than the radial thickness of the seal body 61, and the outer peripheral surface of the second seal portion 63 is formed on a tapered outer peripheral surface that increases in diameter upward. The upper end of the surface is connected to the substantially straight outer peripheral surface of the third seal portion 64 via a stepped portion projecting radially outward.

シール部材６０と環状基板６５が一体的に挿通孔部２４に上側から内嵌装着されるが、この場合、環状基板６５の筒部６５ａが挿通孔部２４の主孔部２４ｄに圧入状に内嵌され、環状基板６５のフランジ部６５ｂが挿通孔部２４の上穴部２４ｂに遊嵌状に内嵌されて、シール部材６０の第２シール部６３が挿通孔部２４よりも下方へ突出した状態になる。   The seal member 60 and the annular substrate 65 are integrally fitted into the insertion hole 24 from above. In this case, the cylindrical portion 65a of the annular substrate 65 is press-fitted into the main hole 24d of the insertion hole 24. The flange portion 65b of the annular substrate 65 is fitted into the upper hole portion 24b of the insertion hole portion 24 so as to be loosely fitted, and the second seal portion 63 of the seal member 60 protrudes downward from the insertion hole portion 24. It becomes a state.

インジェクタ４０は、シール部材６０と環状基板６５に挿通され、シール部材６０と環状基板６５を介してカムホルダ２０の挿通孔部２４に挿通されると共に、シリンダヘッド１０のインジェクタホール１４に挿通され、前記のように、固定機構５０で固定されると、インジェクタ４０の上下方向位置が位置決めされて、鍔部４２が挿通孔部２４の上端穴部２４ａの底面に近接した状態になる。   The injector 40 is inserted through the seal member 60 and the annular substrate 65, is inserted through the insertion hole 24 of the cam holder 20 through the seal member 60 and the annular substrate 65, and is inserted into the injector hole 14 of the cylinder head 10, As described above, when fixed by the fixing mechanism 50, the vertical position of the injector 40 is positioned, and the flange portion 42 comes close to the bottom surface of the upper end hole portion 24 a of the insertion hole portion 24.

このインジェクタ４０の挿通により、第１シール部６２が下方へ弾性変形しつつインジェクタ４０に圧着され、また、環状基板６５の筒部６５ａが挿通孔部２４の主孔部２４ｄに圧入状に内嵌された状態に保持されるため、挿入孔部２４よりも下方へ突出した第２シール部６３が、シリンダヘッド１０の上面のインジェクタホール１４の外周近傍部１０ａに圧着され、この第２シール部６３の圧着による圧縮変形により、第３シール部６４が拡径変形してカムホルダ２０の挿通孔部２４の内周面に圧着された状態が維持される。   By the insertion of the injector 40, the first seal portion 62 is pressed against the injector 40 while being elastically deformed downward, and the cylindrical portion 65a of the annular substrate 65 is press-fitted into the main hole portion 24d of the insertion hole portion 24. Therefore, the second seal portion 63 protruding downward from the insertion hole portion 24 is pressure-bonded to the vicinity of the outer periphery 10 a of the injector hole 14 on the upper surface of the cylinder head 10, and this second seal portion 63. Due to the compression deformation due to the pressure bonding, the third seal portion 64 is deformed in a diameter-enlarged state and maintained in a state where it is pressure-bonded to the inner peripheral surface of the insertion hole portion 24 of the cam holder 20.

以上説明したシリンダヘッド構造２によれば、シリンダヘッド１０の上面にカムホルダ２０を載置固定し、シリンダヘッド１０のインジェクタホール１４とカムホルダ２０の挿通孔部２４とにインジェクタ４０を挿着（挿通）して、インジェクタ４０をシリンダヘッド１０に貫通状に直立配置したものであり、シリンダヘッド１０の上面のインジェクタホール１４の外周近傍部１０ａとカムホルダ２０の下面の挿通孔部２４の外周近傍部２０ａとを環状の間隙５を空けて対面させるように構成した。   According to the cylinder head structure 2 described above, the cam holder 20 is placed and fixed on the upper surface of the cylinder head 10, and the injector 40 is inserted (inserted) into the injector hole 14 of the cylinder head 10 and the insertion hole portion 24 of the cam holder 20. The injector 40 is arranged upright in a penetrating manner in the cylinder head 10, and the vicinity of the outer periphery 10 a of the injector hole 14 on the upper surface of the cylinder head 10 and the vicinity of the outer periphery 20 a of the insertion hole 24 on the lower surface of the cam holder 20. Were configured to face each other with an annular gap 5 therebetween.

従って、直噴ディーゼルエンジン１の気筒３の燃焼室の上側に位置するシリンダヘッド１０のインジェクタホール１４の外周近傍部１０ａには、燃焼室での爆発に伴う大きな突き上げ力が作用するが、その突き上げ力がカムホルダ２０の挿通孔部２４の外周近傍部２０ａにダイレクトに不要に作用しないため、カムホルダ２０の耐久性を高めて、カムホルダ２０に亀裂が生じることを確実に防止できる。   Therefore, a large thrust force due to the explosion in the combustion chamber acts on the vicinity 10a of the outer periphery of the injector hole 14 of the cylinder head 10 located above the combustion chamber of the cylinder 3 of the direct injection diesel engine 1. Since the force does not directly and unnecessarily act on the outer peripheral vicinity 20a of the insertion hole 24 of the cam holder 20, it is possible to improve the durability of the cam holder 20 and reliably prevent the cam holder 20 from cracking.

前記間隙５を形成することにより、従来の構造では、前記両外周近傍部１０ａ，２０ａ間のシール性を確保することが難しいが、カムホルダ２０の挿通孔部２４とインジェクタ４０との間に、弾性のあるシール本体６１と第１〜第３シール部６２〜６４を有するシール部材６０を配設し、シール本体６１を挿通孔部２４の内周面とインジェクタ４０との間に装着し、第１シール部６２をシール本体６１の内方に形成してインジェクタ４０に圧着させ、第２シール部６３をシール本体６１から下方へ延びて挿入孔部２４よりも下方へ突出させてシリンダヘッド１０の上面のインジェクタホール１４の外周近傍部１０ａに圧着させ、第３シール部６４を第２シール部６３の前記圧着による圧縮変形により拡径変形させて挿通孔部２４の内周面に圧着させるように構成した。   By forming the gap 5, in the conventional structure, it is difficult to ensure the sealing performance between the outer peripheral vicinity portions 10a and 20a, but the elastic property is provided between the insertion hole portion 24 of the cam holder 20 and the injector 40. A seal member 61 having a seal body 61 and first to third seal portions 62 to 64 is provided, and the seal body 61 is mounted between the inner peripheral surface of the insertion hole portion 24 and the injector 40, A seal portion 62 is formed on the inner side of the seal body 61 and is crimped to the injector 40, and the second seal portion 63 extends downward from the seal body 61 and protrudes downward from the insertion hole portion 24, so that the upper surface of the cylinder head 10 is formed. The third seal portion 64 is subjected to pressure expansion on the inner peripheral surface of the insertion hole portion 24 by compressing the third seal portion 64 by compressive deformation of the second seal portion 63 due to the compression. It was configured to.

従って、シリンダヘッド１０の上面のインジェクタホール１４の外周近傍部１０ａにシール装着用の加工を施すこともなく、インジェクタ４０とカムホルダ２０の間と、カムホルダ２０とシリンダヘッド１０の間とを確実にシールでき、つまり、シール部材６０により、前記間隙５を形成したうえで、インジェクタ２０の周囲の十分なシール性を確保でき、外部から水やダストが挿通孔部２４やインジェクタホール１４を通って侵入することと、動弁室４からオイルが挿通孔部２４やインジェクタホール１４を通って漏出することを確実に防止することができる。   Accordingly, the outer peripheral vicinity portion 10a of the injector hole 14 on the upper surface of the cylinder head 10 is not subjected to processing for attaching a seal, and the gap between the injector 40 and the cam holder 20 and between the cam holder 20 and the cylinder head 10 are securely sealed. In other words, after the gap 5 is formed by the seal member 60, a sufficient sealing performance around the injector 20 can be secured, and water and dust enter from the outside through the insertion hole 24 and the injector hole 14. In addition, oil can be reliably prevented from leaking from the valve operating chamber 4 through the insertion hole 24 and the injector hole 14.

また、カムホル２０ダの下面の挿通孔部２４の外周近傍部２０ａをカムホルダ２０の下面から段上げ状に形成して前記間隙５を形成したので、カムホルダ２０の形状を少し変更することにより、シリンダヘッド１０の上面のインジェクタホール１４の外周近傍部１０ａをフラットな面にして、前記間隙５を容易に製作コストを高めることなく形成することができる。   Further, the outer peripheral vicinity portion 20a of the insertion hole 24 on the lower surface of the cam holder 20 is formed in a stepped shape from the lower surface of the cam holder 20 to form the gap 5, so that the cylinder can be changed by slightly changing the shape of the cam holder 20 The gap 5 can be easily formed without increasing the manufacturing cost by making the vicinity 10a of the outer periphery of the injector hole 14 on the upper surface of the head 10 flat.

シール本体６１の外周面と底面とに接着されると共に挿通孔部２４に内嵌される断面Ｌ形の環状基板６５を備え、環状基板６５の下側に第３シール部６４を設け、第３シール部６４の下側に第２シール部６３を設けたので、シール本体６１と第１〜第３シール部６２〜６４を有するシール部材６０の一体性を高め、シール部材６０の保持性と共に第１〜第３シール部６２〜６４によるシール性を安定化させることができる。   An annular substrate 65 having an L-shaped cross section that is adhered to the outer peripheral surface and the bottom surface of the seal body 61 and is fitted into the insertion hole 24 is provided. A third seal portion 64 is provided below the annular substrate 65, and a third seal portion 64 is provided. Since the second seal portion 63 is provided on the lower side of the seal portion 64, the integrity of the seal body 61 and the seal member 60 having the first to third seal portions 62 to 64 is improved, and the seal member 60 is retained together with the holding performance. The sealing performance by the 1st-3rd seal parts 62-64 can be stabilized.

カムホルダ２０は、その複数の軸受部２１及び繋ぎ部２２が複数のボルト２９，５９によりシリンダヘッド１０に締結されるので、シリンダヘッド１０の上面にカムホルダ２０を安定して載置固定することができる。   Since the plurality of bearing portions 21 and connecting portions 22 of the cam holder 20 are fastened to the cylinder head 10 by a plurality of bolts 29 and 59, the cam holder 20 can be stably placed and fixed on the upper surface of the cylinder head 10. .

尚、前記実施例を次のように部分的に変更してもよい。
１］シール部材６０の形状、特に、第３，第４シール部６３，６４の形状については、前記機能を有するものであれば種々の形状に構成してもよい。
２］シリンダヘッド１０の上面のインジェクタホール１４の外周近傍部１０ａをシリンダヘッド１０の上面から段下げ状に形成して前記間隙５を形成してもよい。この場合、シリンダヘッド１０の形状を少し変更することにより、カムホルダ２０の下面の挿通孔部２４の外周近傍部２０ａをフラットな面にして、前記間隙５を容易に製作コストを高めることなく形成することができる。 In addition, you may change the said Example partially as follows.
1] The shape of the seal member 60, particularly the shapes of the third and fourth seal portions 63 and 64, may be configured in various shapes as long as they have the above functions.
2] The gap 5 may be formed by forming the vicinity 10 a of the outer periphery of the injector hole 14 on the upper surface of the cylinder head 10 in a step-down manner from the upper surface of the cylinder head 10. In this case, by slightly changing the shape of the cylinder head 10, the outer peripheral vicinity 20 a of the insertion hole 24 on the lower surface of the cam holder 20 is made flat, and the gap 5 is easily formed without increasing the manufacturing cost. be able to.

３］環状基板６５において、内方張出部６５ｃを環状にではなく、周方向に間欠的に複数設け、これら内方張出部をシール部材６０のシール本体６１と第３シール部６４の間に挿入させるように取り付けてもよい。この場合、シール本体６１と第１〜第３シール部６２〜６４の全体を一体成形することが可能になる。 3] In the annular substrate 65, a plurality of inwardly extending portions 65c are provided intermittently in the circumferential direction instead of in an annular shape, and these inwardly extending portions are provided between the seal body 61 and the third seal portion 64 of the seal member 60. You may attach so that it may insert. In this case, the seal body 61 and the first to third seal portions 62 to 64 can be integrally formed.

４］本発明のシリンダヘッド構造２については、前記実施例のような直列４気筒エンジン、更には、１対のカムシャフト８，９を配設したDOHC(double overhead camshaft)式エンジンに限らず、直列６気筒エンジン、SOHC(single overhead camshaft)式エンジン等の種々の直噴ディーゼルエンジンに適用することが可能である。 4] The cylinder head structure 2 of the present invention is not limited to an in-line four-cylinder engine as in the above-described embodiment, and further to a DOHC (double overhead camshaft) engine in which a pair of camshafts 8 and 9 are disposed. The present invention can be applied to various direct injection diesel engines such as an in-line 6-cylinder engine and a SOHC (single overhead camshaft) engine.

実施例に係る直噴ディーゼルエンジンのシリンダヘッド構造の平面図である。It is a top view of the cylinder head structure of the direct-injection diesel engine which concerns on an Example. シリンダヘッド構造のシリンダヘッドカバー等を除く平面図である。It is a top view except a cylinder head cover etc. of a cylinder head structure. シリンダヘッド構造の更にカムホルダ等を除く平面図である。It is a top view except a cam holder etc. of a cylinder head structure. 図１のIV−IV線断面図である。It is the IV-IV sectional view taken on the line of FIG. 図４のＶ−Ｖ線断面図である。It is the VV sectional view taken on the line of FIG. カムホルダの平面図である。It is a top view of a cam holder. インジェクタの正面図である。It is a front view of an injector. インジェクタホルダの平面図である。It is a top view of an injector holder. カムホルダとシリンダヘッドの要部の断面図である。It is sectional drawing of the principal part of a cam holder and a cylinder head. シール部材の断面図である。It is sectional drawing of a sealing member. シール部材を挿通孔部に装着した状態の要部の断面図である。It is sectional drawing of the principal part of the state which mounted | wore the insertion member with the sealing member. インジェクタがシール部材を介して挿通孔部とインジェクタホールに挿通された状態の断面図である。It is sectional drawing of the state by which the injector was penetrated by the penetration hole part and the injector hole through the sealing member.

符号の説明Explanation of symbols

１ 直噴ディーゼルエンジン
２ シリンダヘッド構造
５ 間隙
８，９ カムシャフト
１０ シリンダヘッド
１０ａ 外周近傍部
１４ インジェクタホール
２０ カムホルダ
２０ａ 外周近傍部
２１ 軸受部
２２ 繋ぎ部
２４ 挿通孔部
２９ ボルト
３０ シリンダヘッドカバー
４０ インジェクタ
５９ ボルト
６０ シール部材
６１ シール本体
６２ 第１シール部
６３ 第２シール部
６４ 第３シール部
６５ 環状基板 DESCRIPTION OF SYMBOLS 1 Direct-injection diesel engine 2 Cylinder head structure 5 Gap 8, 9 Cam shaft 10 Cylinder head 10a Outer periphery vicinity part 14 Injector hole 20 Cam holder 20a Outer periphery vicinity part 21 Bearing part 22 Connecting part 24 Insertion hole part 29 Bolt 30 Cylinder head cover 40 Injector 59 Bolt 60 Seal member 61 Seal body 62 First seal portion 63 Second seal portion 64 Third seal portion 65 Annular substrate

Claims (4)

シリンダヘッドの上部にカムシャフトを配設し、このシリンダヘッドにインジェクタを貫通状に直立配置する直噴ディーゼルエンジンのシリンダヘッド構造において、
前記シリンダヘッドの上面に開口しインジェクタが挿着されるインジェクタホールと、
前記シリンダヘッドの上部を外部空間に対して油密に保持すると共に、前記インジェクタの上端部分が上方へ突出する開口部を有するシリンダヘッドカバーと、
前記カムシャフトを回転自在に支持する複数気筒に対応する複数の軸受部と、これら軸受部を繋ぐ繋ぎ部と、この繋ぎ部に形成され前記インジェクタが挿通する挿通孔部とを有し、前記シリンダヘッドの上面に載置固定されたカムホルダと、
前記カムホルダの挿通孔部と前記インジェクタとの間に配設される弾性のあるシール部材とを備え、
前記シリンダヘッドの上面のインジェクタホールの外周近傍部とカムホルダの下面の挿通孔部の外周近傍部とを環状の間隙を空けて対面させるように構成し、
前記シール部材が、前記挿通孔部の内周面とインジェクタとの間に装着されるシール本体と、このシール本体の内方に形成され前記インジェクタに圧着される第１シール部と、シール本体から下方へ延びて前記挿入孔部よりも下方へ突出しシリンダヘッドの上面のインジェクタホールの外周近傍部に圧着される第２シール部と、この第２シール部の前記圧着による圧縮変形により拡径変形して前記挿通孔部の内周面に圧着される第３シール部とを有することを特徴とする直噴ディーゼルエンジンのシリンダヘッド構造。 In a cylinder head structure of a direct injection diesel engine in which a camshaft is disposed at the upper part of the cylinder head and an injector is disposed upright in a penetrating manner in the cylinder head,
An injector hole that opens on the upper surface of the cylinder head and into which the injector is inserted; and
A cylinder head cover having an opening in which an upper end portion of the injector protrudes upward while holding an upper portion of the cylinder head oil-tight with respect to an external space;
A plurality of bearing portions corresponding to a plurality of cylinders that rotatably support the camshaft, a connecting portion that connects the bearing portions, and an insertion hole portion that is formed in the connecting portion and through which the injector is inserted; A cam holder placed and fixed on the upper surface of the head;
An elastic seal member disposed between the insertion hole of the cam holder and the injector;
The cylinder head is configured so that the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head and the vicinity of the outer periphery of the insertion hole on the lower surface of the cam holder face each other with an annular gap therebetween,
The seal member includes a seal body that is mounted between the inner peripheral surface of the insertion hole and the injector, a first seal portion that is formed on the inside of the seal body and is pressure-bonded to the injector, and a seal body. A second seal portion that extends downward and protrudes downward from the insertion hole and is crimped to the vicinity of the outer periphery of the injector hole on the upper surface of the cylinder head, and the diameter of the second seal portion is expanded by the compression deformation due to the crimping. And a third seal portion that is pressure-bonded to the inner peripheral surface of the insertion hole portion. 前記カムホルダの下面の挿通孔部の外周近傍部をカムホルダの下面側から上端側へ後退させて前記間隙が形成されたことを特徴とする請求項１に記載の直噴ディーゼルエンジンのシリンダヘッド構造。 2. The cylinder head structure for a direct injection diesel engine according to claim 1, wherein the gap is formed by retreating the vicinity of the outer periphery of the insertion hole on the lower surface of the cam holder from the lower surface side to the upper end side of the cam holder. 前記シール本体の外周面と底面とに接着されると共に前記挿通孔部に内嵌される断面Ｌ形の環状基板を備え、この環状基板の下側に前記第３シール部が設けられ、この第３シール部の下側に前記第２シール部が設けられたことを特徴とする請求項１又は２に記載の直噴ディーゼルエンジンのシリンダヘッド構造。   An annular substrate having an L-shaped cross section that is adhered to the outer peripheral surface and the bottom surface of the seal body and fitted in the insertion hole portion is provided, and the third seal portion is provided below the annular substrate. The cylinder head structure for a direct injection diesel engine according to claim 1 or 2, wherein the second seal portion is provided below the three seal portions. 前記カムホルダは、その軸受部及び繋ぎ部が複数のボルトによりシリンダヘッドに締結されたことを特徴とする請求項１〜３の何れかに記載の直噴ディーゼルエンジンのシリンダヘッド構造。   The direct-injection diesel engine cylinder head structure according to any one of claims 1 to 3, wherein the cam holder has a bearing portion and a connecting portion fastened to the cylinder head by a plurality of bolts.
JP2006006462A 2006-01-13 2006-01-13 Cylinder head structure of direct injection diesel engine Expired - Fee Related JP4471933B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2006006462A JP4471933B2 (en) 2006-01-13 2006-01-13 Cylinder head structure of direct injection diesel engine
EP20070100140 EP1808597B1 (en) 2006-01-13 2007-01-05 Cylinder head structure for direct-injection diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006006462A JP4471933B2 (en) 2006-01-13 2006-01-13 Cylinder head structure of direct injection diesel engine

Publications (2)

Publication Number Publication Date
JP2007187105A JP2007187105A (en) 2007-07-26
JP4471933B2 true JP4471933B2 (en) 2010-06-02

Family

ID=38001805

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006006462A Expired - Fee Related JP4471933B2 (en) 2006-01-13 2006-01-13 Cylinder head structure of direct injection diesel engine

Country Status (2)

Country Link
EP (1) EP1808597B1 (en)
JP (1) JP4471933B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4997158B2 (en) * 2008-03-27 2012-08-08 内山工業株式会社 Seal member
DE202008014950U1 (en) * 2008-11-11 2010-04-01 Mann+Hummel Gmbh Cylinder head cover for a cylinder head of an internal combustion engine
CN203146815U (en) * 2010-07-08 2013-08-21 内山工业株式会社 Rubber liner and sealing structure having the same
KR101611085B1 (en) 2014-10-16 2016-04-11 현대자동차주식회사 Cam carrier module for vehicles
JP6651844B2 (en) * 2015-12-25 2020-02-19 三菱自動車工業株式会社 cylinder head
DE102016009079A1 (en) * 2016-07-27 2018-02-01 Neander Motors Aktiengesellschaft Fuel injection system for an internal combustion engine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20010787A1 (en) * 2001-08-03 2003-02-03 Rft Spa INJECTION GROUP PROVIDED WITH SEAL, FOR AN INTERNAL COMBUSTION ENGINE.
JP4056266B2 (en) * 2002-03-14 2008-03-05 本田技研工業株式会社 Internal combustion engine with fuel injection valve
FR2862348B1 (en) * 2003-11-14 2006-01-20 Renault Sas ARRANGEMENT FOR SEALING AN INJECTOR WELL
JP3846473B2 (en) * 2003-12-18 2006-11-15 マツダ株式会社 Cylinder head structure of overhead camshaft direct injection diesel engine

Also Published As

Publication number Publication date
EP1808597A3 (en) 2009-04-01
EP1808597B1 (en) 2011-09-14
JP2007187105A (en) 2007-07-26
EP1808597A2 (en) 2007-07-18

Similar Documents

Publication Publication Date Title
JP4471933B2 (en) Cylinder head structure of direct injection diesel engine
JP4483955B2 (en) Engine head module
EP2489865A1 (en) Cover member fastening method and fastening structure for a head cover
JP3846473B2 (en) Cylinder head structure of overhead camshaft direct injection diesel engine
US20210310454A1 (en) Engine
JP5682498B2 (en) Direct injection internal combustion engine
JP2001263204A (en) Common rail type fuel injector of engine
JP2001295736A (en) Injector mounting structure of internal combustion engine
CN108049981B (en) Cylinder head and have its engine and vehicle
JPH08261114A (en) Fuel injection nozzle supporting device for internal combustion engine
JP2000087797A (en) Engine of cylinder fuel injection type
JP2002310040A (en) Injection nozzle installing structure
JP4239887B2 (en) Engine injector mounting structure
JP4424334B2 (en) Cylinder head unit of internal combustion engine and spacer provided in the cylinder head unit
JP2021046850A (en) Injector mounting structure
KR100471835B1 (en) a head cover sealing structure for engine of vehicles
JP2006307670A (en) Cylinder direct injection internal combustion engine
US11352915B2 (en) Cylinder head
KR100412877B1 (en) Auto knock bushing structure in automotive engine
JP2007309254A (en) Cylinder head for internal combustion engine
JPH04125361A (en) Rocker cover gasket structure
JPS638855Y2 (en)
JP3714782B2 (en) Engine harness mounting structure
KR100405434B1 (en) Structure for locking rocker cover for vehicle
JP2013136952A (en) Detent structure of rocker shaft

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20081120

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20091215

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20091224

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100203

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100225

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100302

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130312

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130312

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140312

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees