JP2565322Y2 - Cylinder head structure of direct injection diesel engine - Google Patents
Cylinder head structure of direct injection diesel engineInfo
- Publication number
- JP2565322Y2 JP2565322Y2 JP1992016058U JP1605892U JP2565322Y2 JP 2565322 Y2 JP2565322 Y2 JP 2565322Y2 JP 1992016058 U JP1992016058 U JP 1992016058U JP 1605892 U JP1605892 U JP 1605892U JP 2565322 Y2 JP2565322 Y2 JP 2565322Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- mounting hole
- fuel injection
- diesel engine
- injection nozzle
- 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 - Lifetime
Links
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、直噴式ディーゼルエン
ジンのシリンダヘッド構造に関し、特に、シリンダヘッ
ドの亀裂防止技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head structure of a direct injection diesel engine, and more particularly to a technique for preventing a cylinder head from cracking.
【０００２】[0002]
【従来の技術】従来、ピストン頂部に形成されるキャビ
ティとシリンダヘッドとで構成される燃焼室内に燃料噴
射ノズルを臨ませ、前記キャビティ内周面に向けて燃料
を直接噴射するようにしたエンジン、所謂直噴式ディー
ゼルエンジンが知られている。かかる直噴式ディーゼル
エンジンにおいて、前記燃料噴射ノズルは、シリンダヘ
ッドに形成された取付穴に挿入取付されて先端噴孔がシ
リンダ内部に臨まされる。2. Description of the Related Art Conventionally, an engine in which a fuel injection nozzle is made to face a combustion chamber formed of a cavity formed at the top of a piston and a cylinder head and directly injects fuel toward the inner peripheral surface of the cavity. A so-called direct injection type diesel engine is known. In such a direct-injection diesel engine, the fuel injection nozzle is inserted and mounted in a mounting hole formed in a cylinder head, and a front injection hole faces the inside of the cylinder.
【０００３】[0003]
【考案が解決しようとする課題】ところで、このような
直噴式ディーゼルエンジンにおいては、燃焼時に前記シ
リンダヘッド下面の燃料噴射ノズル取付穴開口周りが高
温ガスに曝されるため、熱負荷（熱応力）によって該取
付穴開口周りに亀裂が発生するという問題点があった。In such a direct-injection diesel engine, however, a heat load (thermal stress) is generated because the vicinity of the fuel injection nozzle mounting hole on the lower surface of the cylinder head is exposed to high-temperature gas during combustion. Therefore, there is a problem that a crack is generated around the opening of the mounting hole.
【０００４】このため、従来では、実開平１−１４９５
４７号公報に示すように、シリンダヘッド下面の吸気バ
ルブと排気バルブの間にウォータジャケットの壁厚を薄
くするような凹部を形成して、ウォータジャケット内の
冷却水による冷却効果を上げ、上記の熱負荷を抑制する
ことが行われている。しかしながら、以上のような構成
では、近年のエンジンの燃焼温度の高温化には充分に対
処することができず、上記亀裂の発生を確実に防止する
には充分満足できない。For this reason, in the prior art, Japanese Utility Model Laid-Open Publication No. 1-1495
As shown in Japanese Patent Publication No. 47, a concave portion is formed between the intake valve and the exhaust valve on the lower surface of the cylinder head so as to reduce the wall thickness of the water jacket, and the cooling effect of the cooling water in the water jacket is increased. The heat load has been suppressed. However, the above configuration cannot sufficiently cope with the recent increase in the combustion temperature of the engine, and cannot be sufficiently satisfied to reliably prevent the occurrence of the crack.
【０００５】そこで、本考案は上述のような従来の問題
点に鑑み、シリンダヘッド下面形状の独特の改良によ
り、燃料噴射ノズル取付穴周りが高温ガスに曝され、熱
応力を受けて亀裂が生じるのを防止することを目的とす
るものである。In view of the above-mentioned conventional problems, the present invention is exposed to high-temperature gas around the fuel injection nozzle mounting hole by a unique improvement in the shape of the lower surface of the cylinder head, and cracks occur due to thermal stress. It is intended to prevent the situation.
【０００６】[0006]
【課題を解決するための手段】このため、本考案の直噴
式ディーゼルエンジンのシリンダヘッド構造は、シリン
ダヘッドに形成された取付穴に挿入取付されて先端噴孔
がシリンダ内部に臨まされた燃料噴射ノズルを備えた直
噴式ディーゼルエンジンにおいて、前記シリンダヘッド
下面の燃料噴射ノズル取付穴開口周りで該取付穴開口面
を含む面に、前記燃料噴射ノズル取付穴のうち、先端噴
孔部が挿入される穴部分の径の２〜３倍の径の円形の陥
凹部を形成し、該陥凹部の内周面と内端面とを曲面で繋
ぐようにした。Therefore, the cylinder head structure of the direct-injection diesel engine of the present invention is provided with a fuel injection device which is inserted and mounted in a mounting hole formed in the cylinder head so that a front injection hole faces the inside of the cylinder. In a direct injection diesel engine provided with a nozzle , a tip injection hole of the fuel injection nozzle mounting hole is provided on a surface including the mounting hole opening surface around the fuel injection nozzle mounting hole opening on the lower surface of the cylinder head.
A circular recess having a diameter two to three times the diameter of the hole into which the hole is inserted was formed, and the inner peripheral surface and the inner end surface of the recess were connected by a curved surface.
【０００７】[0007]
【作用】かかる構成において、シリンダヘッド下面の燃
料噴射ノズル取付穴周りに所定の陥凹部を形成したこと
により、シリンダヘッドの冷却水通路の冷却水による冷
却効果が得られ易くなる共に、燃焼ガス熱の集中を防止
でき、熱が均等発散するため、シリンダヘッド下面の燃
料噴射ノズル取付穴周りの表面温度を低下させることが
でき、熱負荷の軽減により亀裂発生を効果的に防止でき
る。In this configuration, by forming a predetermined recess around the fuel injection nozzle mounting hole on the lower surface of the cylinder head, the cooling effect of the cooling water in the cooling water passage of the cylinder head can be easily obtained and the combustion gas heat Concentration can be prevented, and the heat is evenly radiated, so that the surface temperature around the fuel injection nozzle mounting hole on the lower surface of the cylinder head can be reduced, and cracks can be effectively prevented by reducing the heat load.
【０００８】又、陥凹部の内周面と内端面とを曲面で繋
ぐようにしたから、エッジ部分がなくなり、亀裂発生を
抑制できる。Further, since the inner peripheral surface and the inner end surface of the recess are connected by a curved surface, the edge portion is eliminated, and the occurrence of cracks can be suppressed.
【０００９】[0009]
【実施例】以下、本考案の実施例を図面に基づいて説明
する。図１〜図４において、シリンダヘッド１には、吸
気ポート２と排気ポート３が形成されている。これら吸
気ポート２と排気ポート３はシリンダヘッド１の下面に
開口され、各ポート２，３の開口の周部には図示しない
吸気バルブと排気バルブのバルブシート４が設けられて
いる。又、シリンダヘッド１には、前記吸気ポート２と
排気ポート３を取り囲むように、冷却水通路を構成する
ウォータジャケット５が形成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, an intake port 2 and an exhaust port 3 are formed in a cylinder head 1. The intake port 2 and the exhaust port 3 are opened on the lower surface of the cylinder head 1, and valve seats 4 for intake valves and exhaust valves (not shown) are provided around the openings of the ports 2 and 3. In addition, a water jacket 5 that forms a cooling water passage is formed in the cylinder head 1 so as to surround the intake port 2 and the exhaust port 3.
【００１０】シリンダヘッド１の吸気ポート２と排気ポ
ート３との間の位置から側方にずれた位置に燃料噴射ノ
ズルの取付穴６が形成されている。図示しない燃料噴射
ノズルはこの取付穴６に挿入取付され、先端噴孔部は前
記取付穴６のうち穴部分６Ａに挿入されてシリンダ内部
に臨まされる。ここで、シリンダヘッド１下面の燃料噴
射ノズル取付穴６開口周りで該取付穴６開口面を含む面
には、前記円形の陥凹部７が形成される。又、この陥凹
部７の内周面と内端面とは曲面で繋がれている。即ち、
陥凹部７の内周面と内端面との境部である隅部にはＲ部
８が形成される。A mounting hole 6 for the fuel injection nozzle is formed at a position shifted laterally from a position between the intake port 2 and the exhaust port 3 of the cylinder head 1. A fuel injection nozzle (not shown) is inserted and mounted in the mounting hole 6, and the front end injection hole portion is
It is inserted into the hole portion 6A of the mounting hole 6 and faces the inside of the cylinder. Here, the circular recess 7 is formed on a surface around the opening of the fuel injection nozzle mounting hole 6 on the lower surface of the cylinder head 1 and including the opening surface of the mounting hole 6. The inner peripheral surface and the inner end surface of the recess 7 are connected by a curved surface. That is,
An R portion 8 is formed at a corner which is a boundary between the inner peripheral surface and the inner end surface of the recess 7.
【００１１】かかる陥凹部７の形状及び各部寸法は次の
ように設定する。陥凹部７径＝取付穴６のうち、燃料噴
射ノズルの先端噴孔部が挿入される穴部分６Ａの径の２
〜３倍 陥凹部７深さ＝排気バルブのバルブシート４座面位置 隅Ｒ＝陥凹部７深さの５〜１０倍 例えば、陥凹部７径は２０ｍｍ、陥凹部７深さは１．６
ｍｍ、隅Ｒは１５ｍｍに形成される。The shape and dimensions of each recess 7 are set as follows. Recess 7 diameter = fuel injection out of mounting hole 6
2 of the diameter of the hole 6A into which the tip injection hole of the injection nozzle is inserted
３3 times the depth of the recess 7 = the seat position of the valve seat 4 of the exhaust valve Corner R = 5 to 10 times the depth of the recess 7 For example, the diameter of the recess 7 is 20 mm, and the depth of the recess 7 is 1.6.
mm and the corner R are formed to 15 mm.
【００１２】尚、吸気バルブと排気バルブ間のシリンダ
ヘッド１下面には、ウォータジャケット５の壁厚を薄く
するような凹部９が形成されている。かかる構成による
と、シリンダヘッド１下面の燃料噴射ノズル取付穴６周
りに所定の陥凹部７を形成したことにより、シリンダヘ
ッド１のウォータジャケット５のシリンダヘッド１下面
の燃料噴射ノズル取付穴６周りに対応する部位の肉厚を
薄くでき、この肉厚を薄くした分、該ウォータジャケッ
ト５内の冷却水による冷却効果が得られ易くなる。A concave portion 9 is formed on the lower surface of the cylinder head 1 between the intake valve and the exhaust valve so as to reduce the wall thickness of the water jacket 5. According to this configuration, the predetermined recess 7 is formed around the fuel injection nozzle mounting hole 6 on the lower surface of the cylinder head 1, so that the water jacket 5 of the cylinder head 1 is formed around the fuel injection nozzle mounting hole 6 on the lower surface of the cylinder head 1. The thickness of the corresponding portion can be reduced, and the cooling effect of the cooling water in the water jacket 5 can be easily obtained by the reduced thickness.
【００１３】又、燃料噴射ノズル取付穴６周りのシリン
ダヘッド１下面面積を大きくできるため、燃焼ガス熱の
集中を防止でき、熱が均等発散すると共に、燃焼ガスの
接触が少なくなるため、シリンダヘッド１下面の燃料噴
射ノズル取付穴６周りの表面温度を低下させることがで
きる。以上により、熱負荷の軽減を図れ、亀裂発生を効
果的に防止できる。Also, since the area of the lower surface of the cylinder head 1 around the fuel injection nozzle mounting hole 6 can be increased, the concentration of heat of the combustion gas can be prevented, the heat is evenly radiated, and the contact of the combustion gas is reduced. The surface temperature around the fuel injection nozzle mounting hole 6 on the lower surface 1 can be reduced. As described above, the heat load can be reduced, and the occurrence of cracks can be effectively prevented.
【００１４】特に、陥凹部７の内周面と内端面との境部
である隅部にはＲ部８を形成した結果、エッジ部分がな
くなり、亀裂発生を抑制できる。尚、本考案は実施例の
構成に限定されるものではなく、実用新案登録請求の範
囲に基づいて種々の変更が可能である。In particular, as a result of forming the R portion 8 at the corner which is the boundary between the inner peripheral surface and the inner end surface of the concave portion 7, there is no edge portion, and the occurrence of cracks can be suppressed. It should be noted that the present invention is not limited to the configuration of the embodiment, and various changes can be made based on the claims of the utility model registration.
【００１５】[0015]
【考案の効果】以上説明したように、本考案の直噴式デ
ィーゼルエンジンのシリンダヘッド構造によれば、シリ
ンダヘッド下面の燃料噴射ノズル取付穴開口周りで該取
付穴開口面を含む面に、特定した径の円形の陥凹部を形
成し、該陥凹部の内周面と内端面とを曲面で繋ぐように
したから、熱負荷の軽減を図れ、亀裂発生を抑制できる
ため、亀裂発生を効果的に防止できるものである。As described above, according to the cylinder head structure of the direct injection diesel engine of the present invention, the surface including the mounting hole opening surface around the fuel injection nozzle mounting hole opening on the lower surface of the cylinder head is specified. Since a circular concave portion having a diameter is formed and the inner peripheral surface and the inner end surface of the concave portion are connected by a curved surface, heat load can be reduced, and crack generation can be suppressed. It can be prevented.
【図１】 本考案の一実施例を示すシリンダヘッドの上
面図FIG. 1 is a top view of a cylinder head showing one embodiment of the present invention.
【図２】 同上のシリンダヘッドの下面図FIG. 2 is a bottom view of the cylinder head.
【図３】 燃料噴射ノズル取付穴の断面図FIG. 3 is a sectional view of a fuel injection nozzle mounting hole.
【図４】 図３のＡ部拡大断面図FIG. 4 is an enlarged sectional view of a portion A in FIG. 3;
１ シリンダヘッド ６ 燃料噴射ノズル取付穴６Ａ 先端噴孔部が挿入される穴部分 ７ 陥凹部 ８ Ｒ部 DESCRIPTION OF SYMBOLS 1 Cylinder head 6 Fuel injection nozzle mounting hole 6A Hole part into which tip injection hole is inserted 7 Depression 8 R
Claims (1)
取付されて先端噴孔がシリンダ内部に臨まされた燃料噴
射ノズルを備えた直噴式ディーゼルエンジンにおいて、
前記シリンダヘッド下面の燃料噴射ノズル取付穴開口周
りで該取付穴開口面を含む面に、前記燃料噴射ノズル取
付穴のうち、先端噴孔部が挿入される穴部分の径の２〜
３倍の径の円形の陥凹部を形成し、該陥凹部の内周面と
内端面とを曲面で繋ぐようにしたことを特徴とする直噴
式ディーゼルエンジンのシリンダヘッド構造。1. A direct-injection diesel engine having a fuel injection nozzle inserted and mounted in a mounting hole formed in a cylinder head and having a front-end injection hole facing the inside of the cylinder.
A plane including the attaching hole opening surface in the fuel injection nozzle mounting hole openings around the lower surface of the cylinder head, intake the fuel injection nozzle
Of the attached holes , the diameter of the hole part where the tip injection hole is inserted is 2 to 2
A cylinder head structure for a direct-injection diesel engine, wherein a circular recess having a diameter three times as large is formed, and an inner peripheral surface and an inner end surface of the recess are connected by a curved surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992016058U JP2565322Y2 (en) | 1992-03-26 | 1992-03-26 | Cylinder head structure of direct injection diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992016058U JP2565322Y2 (en) | 1992-03-26 | 1992-03-26 | Cylinder head structure of direct injection diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0577565U JPH0577565U (en) | 1993-10-22 |
| JP2565322Y2 true JP2565322Y2 (en) | 1998-03-18 |
Family
ID=11905979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992016058U Expired - Lifetime JP2565322Y2 (en) | 1992-03-26 | 1992-03-26 | Cylinder head structure of direct injection diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2565322Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080055442A (en) * | 2006-12-15 | 2008-06-19 | 현대자동차주식회사 | Glow plug hole structure for cylinder head |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN168097B (en) * | 1985-12-12 | 1991-02-02 | Cummins Engine Co Inc |
-
1992
- 1992-03-26 JP JP1992016058U patent/JP2565322Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0577565U (en) | 1993-10-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |