JPH05312098A - Cylinder head structure in indirect injection diesel engine - Google Patents

Cylinder head structure in indirect injection diesel engine

Info

Publication number
JPH05312098A
JPH05312098A JP4117330A JP11733092A JPH05312098A JP H05312098 A JPH05312098 A JP H05312098A JP 4117330 A JP4117330 A JP 4117330A JP 11733092 A JP11733092 A JP 11733092A JP H05312098 A JPH05312098 A JP H05312098A
Authority
JP
Japan
Prior art keywords
cooling water
combustion chamber
cylinder head
exhaust hole
water passage
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.)
Granted
Application number
JP4117330A
Other languages
Japanese (ja)
Other versions
JP3117538B2 (en
Inventor
Hiroaki Yasuda
浩明 安田
Yoshiaki Enseki
義彰 煙石
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
Original Assignee
Mazda Motor Corp
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 filed Critical Mazda Motor Corp
Priority to JP04117330A priority Critical patent/JP3117538B2/en
Publication of JPH05312098A publication Critical patent/JPH05312098A/en
Application granted granted Critical
Publication of JP3117538B2 publication Critical patent/JP3117538B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

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

Abstract

PURPOSE:To provide a cylinder head structure that is able to improve the extent of cooling efficiency in and around a sub-combustion chamber of a cylinder head, in an indirect injection diesel engine. CONSTITUTION:A pair of second cooling water passages 22, extending up to a part in and around a wall part at the side of an exhaust hole 18 of an auxiliary combustion chamber 14 after passing through an interval between this exhaust hole 18 and an intake port 16, and being interconnected with each other at this wall part. With this constitution, cooling water taken into from two directions through the second cooling water passage 22 is joined together in and around the wall part at the side of the exhaust hole 18 of the sub-combustion chamber 14, and at this time, the part is sufficiently cooled. The cooling water after convergence flows into a first cooling water passage 20 being connected to the second cooling water passage 22. The paired intake ports 16 are formed in a cylinder bank direction at the specified interval. With this formation, the paired second cooling water passages 22 are formable almost symmetrically, through which the cooling water conducted through the second cooling water passage 22 can be well-balancedly converged at the part on an around the wall part at the side of the exhaust port 18 of the auxiliary combustion chamber 14.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、副燃焼室を有する副室
式ディーゼルエンジンにおけるシリンダヘッドの構造に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cylinder head in a sub chamber type diesel engine having a sub combustion chamber.

【０００２】[0002]

【従来の技術】副室式ディーゼルエンジンにおいては、
一般に、シリンダヘッドの内部に副燃焼室が設けられる
が、この副燃焼室はかなり高い温度になるので、従来よ
り、シリンダヘッドの内部に所定の冷却構造を設けて、
シリンダヘッドの副燃焼室周辺部位の過熱を防止するよ
うになっている。例えば、実開昭５５−１３２３４３号
公報には、１対の吸気孔を有する副室式ディーゼルエン
ジンにおいて、これら１対の吸気孔を間に挟むようにし
て排気孔と副燃焼室とを両吸気孔相互間の両側に形成す
るとともに、シリンダ列の側方から排気孔と一方の吸気
孔との間を通って副燃焼室の排気孔側の壁部近傍部位ま
で延びる冷却水通路を形成し、この冷却水通路を通して
冷却水を導入することにより、シリンダヘッドの副燃焼
室周辺部位の冷却を図るようにしたシリンダヘッド構造
が開示されている。2. Description of the Related Art In a sub-chamber diesel engine,
Generally, a sub-combustion chamber is provided inside the cylinder head, but since this sub-combustion chamber has a considerably high temperature, conventionally, by providing a predetermined cooling structure inside the cylinder head,
The cylinder head is designed to prevent overheating around the auxiliary combustion chamber. For example, in Japanese Utility Model Laid-Open No. 55-132343, in a sub-chamber diesel engine having a pair of intake holes, an exhaust hole and a sub-combustion chamber are formed so as to sandwich the pair of intake holes therebetween. The cooling water passages are formed on both sides of the space, and extend from the side of the cylinder row between the exhaust holes and one of the intake holes to the vicinity of the wall portion on the exhaust hole side of the auxiliary combustion chamber. A cylinder head structure is disclosed in which cooling water is introduced through a water passage to cool a peripheral portion of the cylinder head in the auxiliary combustion chamber.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来のシリンダヘッド構造においては、１対の吸気孔と排
気孔と副燃焼室とが菱形の頂点をなすように配置されて
いるのに対し、冷却水通路は排気孔と一方の吸気孔との
間を通るようにして形成されているので、冷却水通路を
通して導入された冷却水を副燃焼室の排気孔側の壁部近
傍部位に直角方向から当てることが困難であり、このた
めシリンダヘッドの副燃焼室周辺部位の冷却効率を十分
に高めることができなかった。However, in the above-mentioned conventional cylinder head structure, the pair of intake holes, the exhaust holes, and the auxiliary combustion chamber are arranged so as to form the apex of the rhombus, while the cooling is performed. Since the water passage is formed so as to pass between the exhaust hole and one of the intake holes, the cooling water introduced through the cooling water passage is introduced from the direction perpendicular to the vicinity of the wall portion on the exhaust hole side of the auxiliary combustion chamber. Since it is difficult to apply it, it was not possible to sufficiently enhance the cooling efficiency of the area around the auxiliary combustion chamber of the cylinder head.

【０００４】本発明は、このような事情に鑑みてなされ
たものであって、シリンダヘッドの副燃焼室周辺部位の
冷却効率を高めることができる副室式ディーゼルエンジ
ンのシリンダヘッド構造を提供することを目的とするも
のである。The present invention has been made in view of the above circumstances, and provides a cylinder head structure of a sub-chamber diesel engine capable of enhancing the cooling efficiency of the peripheral portion of the cylinder head in the sub-combustion chamber. The purpose is.

【０００５】[0005]

【課題を解決するための手段】本発明に係る副室式ディ
ーゼルエンジンのシリンダヘッド構造は、所定の冷却水
通路を１対設けることにより、上記目的達成を図るよう
にしたものである。A cylinder head structure for a sub-chamber diesel engine according to the present invention is designed to achieve the above object by providing a pair of predetermined cooling water passages.

【０００６】すなわち、副燃焼室を有するディーゼルエ
ンジンにおけるシリンダヘッドの構造であって、シリン
ダ列方向に所定間隔をおいて１対の吸気孔が形成される
とともに、これら１対の吸気孔を間に挟むようにして排
気孔と前記副燃焼室とが前記１対の吸気孔相互間の両側
に形成され、前記排気孔と前記副燃焼室との間に第１冷
却水通路が形成され、前記シリンダ列の側方から前記排
気孔と前記各吸気孔との間を通って前記副燃焼室の前記
排気孔側の壁部近傍部位まで延び、該部位で互いに連通
するとともに該部位で前記第１冷却水通路に連通する１
対の第２冷却水通路が形成されている、ことを特徴とす
るものである。That is, in the structure of a cylinder head in a diesel engine having an auxiliary combustion chamber, a pair of intake holes are formed at predetermined intervals in the cylinder row direction, and the pair of intake holes are interposed between them. An exhaust hole and the auxiliary combustion chamber are formed so as to be sandwiched between the pair of intake holes, and a first cooling water passage is formed between the exhaust hole and the auxiliary combustion chamber. It extends from the side to a portion near the wall of the auxiliary combustion chamber on the side of the exhaust hole through the space between the exhaust hole and each of the intake holes, and communicates with each other at the part and the first cooling water passage at the part. To communicate with
It is characterized in that a pair of second cooling water passages is formed.

【０００７】[0007]

【発明の作用および効果】上記構成に示すように、排気
孔と前記各吸気孔との間を通って副燃焼室の排気孔側の
壁部近傍部位まで延び、該部位で互いに連通する１対の
第２冷却水通路が形成されているので、これら第２冷却
水通路を通して２方向から導入された冷却水は副燃焼室
の排気孔側の壁部近傍部位で合流し、その際に該部位を
十分に冷却することとなる。そして、合流後の冷却水
は、第２冷却水通路に連通する第１冷却水通路へ流出す
ることとなる。また、上記１対の吸気孔は、シリンダ列
方向に所定間隔をおいて形成されているので、１対の第
２冷却水通路を略左右対称に形成することができ、これ
により、第２冷却水通路を通して導入された冷却水を副
燃焼室の排気孔側の壁部近傍部位でバランスよく合流さ
せることができる。As described above, a pair of members extending between the exhaust hole and each of the intake holes to the vicinity of the wall portion of the auxiliary combustion chamber on the exhaust hole side, and communicating with each other at the portion. Since the second cooling water passages are formed, the cooling water introduced from two directions through these second cooling water passages joins in the vicinity of the exhaust hole side wall portion of the auxiliary combustion chamber, and at that time Will be sufficiently cooled. Then, the combined cooling water flows out to the first cooling water passage communicating with the second cooling water passage. Further, since the pair of intake holes are formed at a predetermined interval in the cylinder row direction, the pair of second cooling water passages can be formed substantially symmetrically, and thus the second cooling water passage can be formed. The cooling water introduced through the water passage can be joined in a well-balanced manner in the vicinity of the wall portion on the exhaust hole side of the auxiliary combustion chamber.

【０００８】したがって、本発明によれば、シリンダヘ
ッドの副燃焼室周辺部位の冷却効率を高めることができ
る。Therefore, according to the present invention, it is possible to enhance the cooling efficiency of the portion around the auxiliary combustion chamber of the cylinder head.

【０００９】[0009]

【実施例】以下、添付図面を参照しながら、本発明の実
施例について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.

【００１０】図１は、本発明に係る副室式ディーゼルエ
ンジンのシリンダヘッド構造の一実施例を示す平断面
図、図２は、その側断面図である。FIG. 1 is a plan sectional view showing an embodiment of a cylinder head structure of a sub-chamber type diesel engine according to the present invention, and FIG. 2 is a side sectional view thereof.

【００１１】これらの図に示すように、このシリンダヘ
ッド構造は、副燃焼室１４を有するディーゼルエンジン
におけるシリンダヘッド１２の構造である。As shown in these figures, this cylinder head structure is the structure of the cylinder head 12 in a diesel engine having the auxiliary combustion chamber 14.

【００１２】このシリンダヘッド１２には、各気筒毎
に、シリンダ列方向に所定間隔をおいて１対の吸気孔１
６が形成されるとともに、これら１対の吸気孔１６を間
に挟むようにして排気孔１８と副燃焼室１４とが両吸気
孔１６相互間の両側に形成されている。そして、排気孔
１８と副燃焼室１４との間には、第１冷却水通路２０が
形成されている。また、このシリンダヘッド１２には、
上記シリンダ列の側方から排気孔１８と各吸気孔１６と
の間を通って副燃焼室１４の排気孔１８側の壁部近傍部
位まで延びる１対の第２冷却水通路２２が形成されてい
る。これら１対の第２冷却水通路２２は、上記壁部近傍
部位で互いに連通するとともに、該部位で第１冷却水通
路２０に連通するように形成されている。The cylinder head 12 has a pair of intake holes 1 at predetermined intervals in the cylinder row direction for each cylinder.
6 is formed, and an exhaust hole 18 and an auxiliary combustion chamber 14 are formed on both sides of the intake holes 16 so as to sandwich the pair of intake holes 16 therebetween. A first cooling water passage 20 is formed between the exhaust hole 18 and the auxiliary combustion chamber 14. In addition, in this cylinder head 12,
A pair of second cooling water passages 22 is formed which extends from the side of the cylinder row through the space between the exhaust holes 18 and the intake holes 16 to a site near the wall of the auxiliary combustion chamber 14 on the exhaust hole 18 side. There is. The pair of second cooling water passages 22 are formed so as to communicate with each other near the wall portion and to communicate with the first cooling water passage 20 at the portion.

【００１３】各第２冷却水通路２２のシリンダ列側方端
部には、プラグ栓用孔２４が形成されており、各第２冷
却水通路２２は、このプラグ栓用孔２４においてプラグ
による栓がなされるようになっている。そして、各第２
冷却水通路２２は、このプラグ栓用孔２４の近傍におい
て冷却水導入路２６に連通している。A plug plug hole 24 is formed at the end of each second cooling water passage 22 on the side of the cylinder row, and each second cooling water passage 22 is plugged by a plug at this plug plug hole 24. Is to be done. And each second
The cooling water passage 22 communicates with the cooling water introduction passage 26 in the vicinity of the plug stopper hole 24.

【００１４】排気ポート２８は、上記排気孔１８からシ
リンダヘッド１２の第２冷却水通路２２配設側に延びる
ようにして形成され、吸気ポート３０は、上記各吸気孔
１６から第２冷却水通路２２配設側とは反対側に延びる
ようにして形成されている。排気ポート２８は、１対の
第２冷却水通路２２の間を延びるようにして設けられて
おり、吸気ポート３０は、副燃焼室１４の上方両側近傍
を延びるようにして設けられている。The exhaust port 28 is formed so as to extend from the exhaust hole 18 toward the second cooling water passage 22 side of the cylinder head 12, and the intake port 30 extends from each of the intake holes 16 to the second cooling water passage. 22 is formed so as to extend on the side opposite to the side where it is disposed. The exhaust port 28 is provided so as to extend between the pair of second cooling water passages 22, and the intake port 30 is provided so as to extend near both upper sides of the auxiliary combustion chamber 14.

【００１５】次に、本実施例の作用について説明する。Next, the operation of this embodiment will be described.

【００１６】１対の第２冷却水通路２２が、排気孔１８
と各吸気孔１６との間を通って副燃焼室１４の排気孔１
８側の壁部近傍部位まで延び、該部位で互いに連通する
ように形成されているので、これら第２冷却水通路２２
を通して２方向から導入された冷却水は副燃焼室１４の
排気孔１８側の壁部近傍部位で合流し、その際に該部位
を十分に冷却することとなる。そして、合流後の冷却水
は、これら第２冷却水通路２２に連通する第１冷却水通
路２０へ流出することとなる。また、上記１対の吸気孔
１６は、シリンダ列方向に所定間隔をおいて形成されて
いるので、１対の第２冷却水通路２２を略左右対称に形
成することができ、これにより、第２冷却水通路２２を
通して導入された冷却水を副燃焼室１４の排気孔１８側
の壁部近傍部位でバランスよく合流させることができ
る。A pair of second cooling water passages 22 are provided in the exhaust hole 18
The exhaust hole 1 of the auxiliary combustion chamber 14 through between the
The second cooling water passages 22 are formed so as to extend to a portion near the wall portion on the 8 side and communicate with each other at the portion.
The cooling water introduced from two directions through the merging flow joins at a portion near the wall portion of the auxiliary combustion chamber 14 on the exhaust hole 18 side, and at that time, the portion is sufficiently cooled. Then, the combined cooling water flows out to the first cooling water passage 20 communicating with the second cooling water passages 22. Further, since the pair of intake holes 16 are formed at a predetermined interval in the cylinder row direction, the pair of second cooling water passages 22 can be formed substantially symmetrically. The cooling water introduced through the second cooling water passage 22 can be merged in a well-balanced manner in the vicinity of the wall portion on the exhaust hole 18 side of the auxiliary combustion chamber 14.

【００１７】したがって、本実施例によれば、シリンダ
ヘッド１２の副燃焼室１４周辺部位の冷却効率を高める
ことができる。Therefore, according to this embodiment, it is possible to enhance the cooling efficiency of the portion around the auxiliary combustion chamber 14 of the cylinder head 12.

【００１８】また、上記のような配置で副燃焼室１４、
吸気孔１６、排気孔１８および第２冷却水通路２２を形
成することにより、図示のように、排気ポート２８およ
び吸気ポート３０の形成を容易に行うことができる。そ
して、これにより、シリンダヘッド１２の成形性を向上
させることができる。Further, in the above arrangement, the auxiliary combustion chamber 14,
By forming the intake hole 16, the exhaust hole 18, and the second cooling water passage 22, it is possible to easily form the exhaust port 28 and the intake port 30 as illustrated. And thereby, the moldability of the cylinder head 12 can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係る副室式ディーゼルエンジンのシリ
ンダヘッド構造の一実施例を示す平断面図FIG. 1 is a plan sectional view showing an embodiment of a cylinder head structure of a sub-chamber diesel engine according to the present invention.

【図２】本発明に係る副室式ディーゼルエンジンのシリ
ンダヘッド構造の一実施例を示す側断面図FIG. 2 is a side sectional view showing an embodiment of a cylinder head structure of a sub-chamber diesel engine according to the present invention.

【符号の説明】[Explanation of symbols]

１２ シリンダヘッド １４ 副燃焼室 １６ 吸気孔 １８ 排気孔 ２０ 第１冷却水通路 ２２ 第２冷却水通路 12 Cylinder Head 14 Secondary Combustion Chamber 16 Intake Hole 18 Exhaust Hole 20 First Cooling Water Passage 22 Second Cooling Water Passage

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 副燃焼室を有するディーゼルエンジンに
おけるシリンダヘッドの構造であって、 シリンダ列方向に所定間隔をおいて１対の吸気孔が形成
されるとともに、これら１対の吸気孔を間に挟むように
して排気孔と前記副燃焼室とが前記１対の吸気孔相互間
の両側に形成され、 前記排気孔と前記副燃焼室との間に第１冷却水通路が形
成され、 前記シリンダ列の側方から前記排気孔と前記各吸気孔と
の間を通って前記副燃焼室の前記排気孔側の壁部近傍部
位まで延び、該部位で互いに連通するとともに該部位で
前記第１冷却水通路に連通する１対の第２冷却水通路が
形成されている、ことを特徴とする副室式ディーゼルエ
ンジンのシリンダヘッド構造。1. A structure of a cylinder head in a diesel engine having a secondary combustion chamber, wherein a pair of intake holes are formed at a predetermined interval in a cylinder row direction, and the pair of intake holes are interposed therebetween. An exhaust hole and the auxiliary combustion chamber are formed so as to be sandwiched therebetween on both sides between the pair of intake holes, and a first cooling water passage is formed between the exhaust hole and the auxiliary combustion chamber. It extends from the side to a portion near the wall of the auxiliary combustion chamber on the side of the exhaust hole through the space between the exhaust hole and each of the intake holes, and communicates with each other at the part and the first cooling water passage at the part. And a pair of second cooling water passages communicating with the cylinder head structure of the sub-chamber diesel engine.
JP04117330A 1992-05-11 1992-05-11 Cylinder head structure of subchamber diesel engine Expired - Fee Related JP3117538B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04117330A JP3117538B2 (en) 1992-05-11 1992-05-11 Cylinder head structure of subchamber diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04117330A JP3117538B2 (en) 1992-05-11 1992-05-11 Cylinder head structure of subchamber diesel engine

Publications (2)

Publication Number Publication Date
JPH05312098A true JPH05312098A (en) 1993-11-22
JP3117538B2 JP3117538B2 (en) 2000-12-18

Family

ID=14709071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP04117330A Expired - Fee Related JP3117538B2 (en) 1992-05-11 1992-05-11 Cylinder head structure of subchamber diesel engine

Country Status (1)

Country Link
JP (1) JP3117538B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305146A (en) * 2011-08-19 2012-01-04 中国兵器工业集团第七○研究所 Novel diesel engine cylinder cover
JP2016079814A (en) * 2014-10-10 2016-05-16 株式会社クボタ Engine cylinder head cooling device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305146A (en) * 2011-08-19 2012-01-04 中国兵器工业集团第七○研究所 Novel diesel engine cylinder cover
JP2016079814A (en) * 2014-10-10 2016-05-16 株式会社クボタ Engine cylinder head cooling device

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