JP2753785B2 - Cylinder head for water-cooled multi-cylinder diesel engine - Google Patents

Cylinder head for water-cooled multi-cylinder diesel engine

Info

Publication number
JP2753785B2
JP2753785B2 JP5027520A JP2752093A JP2753785B2 JP 2753785 B2 JP2753785 B2 JP 2753785B2 JP 5027520 A JP5027520 A JP 5027520A JP 2752093 A JP2752093 A JP 2752093A JP 2753785 B2 JP2753785 B2 JP 2753785B2
Authority
JP
Japan
Prior art keywords
cooling water
flow
combustion chamber
cylinder
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.)
Expired - Lifetime
Application number
JP5027520A
Other languages
Japanese (ja)
Other versions
JPH06221149A (en
Inventor
洋介 森本
潔 畑浦
学 宮崎
博 三雲
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.)
Kubota Corp
Original Assignee
Kubota 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 Kubota Corp filed Critical Kubota Corp
Priority to JP5027520A priority Critical patent/JP2753785B2/en
Publication of JPH06221149A publication Critical patent/JPH06221149A/en
Application granted granted Critical
Publication of JP2753785B2 publication Critical patent/JP2753785B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1812—Number of cylinders three
    • 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
    • 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

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)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】この発明は、水冷式多気筒ディー
ゼルエンジンのシリンダヘッドに関し、特に熱負荷の大
きい箇所の冷却効果を高めることができるシリンダヘッ
ドの構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head of a water-cooled multi-cylinder diesel engine, and more particularly to a structure of a cylinder head capable of enhancing a cooling effect of a portion having a large heat load.

【０００２】[0002]

【従来の技術】多気筒ディーゼルエンジン、特に副燃焼
室式ディーゼルエンジンで多弁化され、平均有効圧が高
いディーゼルエンジンにおいては、各気筒の直上部が爆
発による熱応力や衝撃力を強く受ける。そのためシリン
ダヘッド１０の該当箇所ではクラックが発生し易く、こ
のようなクラックの発生を防止するために、効果的な冷
却が必要になる。2. Description of the Related Art In a multi-cylinder diesel engine, particularly a diesel engine having a high average effective pressure, which has multiple valves in a sub-combustion chamber type diesel engine, the upper portion of each cylinder is strongly subjected to thermal stress and impact force due to explosion. For this reason, cracks are likely to occur in the corresponding portions of the cylinder head 10, and effective cooling is required to prevent such cracks from occurring.

【０００３】水冷式多気筒ディーゼルエンジンの冷却装
置として、図３に示すものがある。この冷却装置は、デ
ィーゼルエンジンＥの前部に冷却ファン３１とラジエー
タ３２とを設け、ラジエータ３２で冷却した冷却水Ｗを
ウォータポンプ３３でシリンダブロック１内のウォータ
ジャケット２からシリンダヘッド１０内のヘッドジャケ
ット１２に圧送して、シリンダブロック１とシリンダヘ
ッド１０とを冷却し、シリンダヘッド１０から再びラジ
エータ３２に還流させるように構成されている。FIG. 3 shows a cooling device for a water-cooled multi-cylinder diesel engine. In this cooling device, a cooling fan 31 and a radiator 32 are provided at the front of a diesel engine E, and cooling water W cooled by the radiator 32 is moved by a water pump 33 from a water jacket 2 in a cylinder block 1 to a head in a cylinder head 10. The cylinder block 1 and the cylinder head 10 are cooled by being fed to the jacket 12 and returned to the radiator 32 from the cylinder head 10 again.

【０００４】図２は上記シリンダヘッド１０の従来例を
示す。同図(Ａ)は上記シリンダブロック１とシリンダヘ
ッド１０との間に介在するガスケット３の平面図、同図
(Ｂ)はシリンダヘッド１０の要部横断平面図、同図(Ｃ)
は同図(Ｂ)のＣ−Ｃ線縦断面図、同図(Ｄ)は同図(Ｂ)の
Ｄ−Ｄ線縦断面図、同図(Ｅ)は同図(Ｂ)のＥ−Ｅ線縦断
面図である。FIG. 2 shows a conventional example of the cylinder head 10 described above. FIG. 1A is a plan view of a gasket 3 interposed between the cylinder block 1 and the cylinder head 10, and FIG.
(B) is a cross-sectional plan view of the main part of the cylinder head 10, and FIG.
Is a vertical cross-sectional view taken along line CC of FIG. 1B, FIG. 2D is a vertical cross-sectional view taken along line DD of FIG. 1B, and FIG. 1E is EE of FIG. 1B. It is a line longitudinal cross-sectional view.

【０００５】このシリンダヘッド１０は、二つの吸気弁
口１３ａと一つの排気弁口１４ａと副燃焼室１５とを各
シリンダボア８の上側配置し、各吸気ポート１３は、各
副燃焼室１５の横側を通ってボア配列方向と交差する方
向に走らせてヘッド一側面に開口するとともに、各排気
ポート１４は吸気ポート１３と反対方向に走らせてヘッ
ド他側面に開口して構成されている。上記シリンダヘッ
ド１０内には、ヘッドジャケット１２が形成され、この
ヘッドジャケット１２は、シリンダヘッド１０の一端に
開口したジャケット出口１６に連通するとともに、吸気
ポート１３・排気ポート１４・副燃焼室１５により分岐
された複数の通路１２ａ〜１２ｆから成る。In the cylinder head 10, two intake valve ports 13a, one exhaust valve port 14a, and a sub-combustion chamber 15 are arranged above each cylinder bore 8, and each intake port 13 is located beside the sub-combustion chamber 15. Each exhaust port 14 runs in the direction opposite to the intake port 13 and opens in the other side of the head while running in the direction intersecting the bore arrangement direction through the side. A head jacket 12 is formed in the cylinder head 10. The head jacket 12 communicates with a jacket outlet 16 opened at one end of the cylinder head 10, and is formed by an intake port 13, an exhaust port 14, and an auxiliary combustion chamber 15. It is composed of a plurality of branched passages 12a to 12f.

【０００６】上記シリンダヘッド１０の下面には、ガス
ケット３の冷却水上昇孔４・５・６７に対応する複数の
冷却水上昇孔４ａ・５ａ・６ａ・７ａがあけられてお
り、これらの冷却水上昇孔４ａ〜７ａは、吸気ポート１
３の下側通路１２ｂに臨ませてあけた冷却水上昇孔４ａ
と、副燃焼室１５の外側通路１２ｃに臨ませてあけた冷
却水上昇孔５ａと、排気ポート１４の下側通路１２ａに
臨ませてあけた冷却水上昇孔６ａと、ガスケット３のシ
リンダボア８・８間の冷却水上昇孔７・７と連通する冷
却水上昇孔７ａ・７ａとから成る。そして上記ガスケッ
ト３の冷却水上昇孔４・５・６の大きさを適宜設定する
ことにより、シリンダブロック１からシリンダヘッド１
０へ上昇する冷却水の流量を設定するように構成されて
いる。A plurality of cooling water rising holes 4a, 5a, 6a, 7a corresponding to the cooling water rising holes 4, 5, 67 of the gasket 3 are formed on the lower surface of the cylinder head 10. The rising holes 4a to 7a
3 cooling water rising hole 4a facing the lower passage 12b
A cooling water rising hole 5a opened to the outer passage 12c of the auxiliary combustion chamber 15, a cooling water rising hole 6a opened to the lower passage 12a of the exhaust port 14, and a cylinder bore 8 of the gasket 3. The cooling water rising holes 7a, 7a communicating with the cooling water rising holes 7, 7 between 8 are provided. By appropriately setting the sizes of the cooling water rising holes 4, 5, 6 of the gasket 3, the cylinder head 1
It is configured to set the flow rate of the cooling water rising to zero.

【０００７】なお、上記ガスケット３（図２(Ａ)）の冷
却水上昇孔４・５・６・７のうち、シリンダボア８の近
傍の冷却水上昇孔７を除く他の冷却水上昇孔４・５・６
は、当該ガスケット３の下側のシリンダブロック１に流
入する冷却水Ｗの水圧を考慮して、流入側（図(Ａ)の左
側）から遠ざかるにつれて、次第に孔径が大きく設定さ
れている。なお、符号１８はシリンダヘッド１０の固定
ボルト、１９はその固定ボルト用ボス部である。[0007] Of the cooling water rising holes 4, 5, 6, 7 of the gasket 3 (FIG. 2 (A)), other cooling water rising holes 4 except for the cooling water rising hole 7 near the cylinder bore 8 are provided. 5.6
In consideration of the water pressure of the cooling water W flowing into the lower cylinder block 1 of the gasket 3, the hole diameter is set to gradually increase as the distance from the inflow side (left side in FIG. 1A) increases. Reference numeral 18 denotes a fixing bolt of the cylinder head 10, and 19 denotes a boss for the fixing bolt.

【０００８】[0008]

【発明が解決しようとする課題】上記従来例では、排気
ポート１４の下側通路１２ａと上側通路１２ｂとは途中
で合流と分流を繰り返しつつメイン通路を形成し、排気
ポート１４の下側通路１２ａにあけた冷却水上昇孔６ａ
より上昇した冷却水Ｗは、上記メイン通路を通る一つの
大きな流れを形成する。また、副燃焼室１５の外側通路
１２ｃにあけた冷却水上昇孔５ａより上昇した冷却水Ｗ
は、その外側通路１２ｃに隣接する吸気ポート１３の下
側通路１２ｂを前記メイン通路と平行に流れる別の大き
な流れを形成する。そして、これらの二つの流れは、ジ
ャケット出口１６で一つに合流する。In the above-mentioned conventional example, the lower passage 12a and the upper passage 12b of the exhaust port 14 form a main passage while repeatedly joining and branching on the way, and the lower passage 12a of the exhaust port 14 is formed. Cooling water rising hole 6a
The higher cooling water W forms one large flow through the main passage. Further, the cooling water W rising from the cooling water rising hole 5a opened in the outer passage 12c of the sub-combustion chamber 15
Forms another large flow flowing in parallel with the main passage in the lower passage 12b of the intake port 13 adjacent to the outer passage 12c. Then, these two streams merge into one at the jacket outlet 16.

【０００９】つまり上記従来例では、これらの二つの流
れが冷却水Ｗの主流をなし、その他の分岐通路への流れ
は流速の緩いものとなる。このため、副燃焼室１５の周
囲や吸気弁口１３ａと排気弁口１４ａとの間を十分に冷
却することができず、副燃焼室１５と排気弁口１４ａと
の間や吸気弁口１３ａと排気弁口１４ａとの間にクラッ
クが生じ易い。本発明はこのような事情を考慮してなさ
れたもので、上記クラックの発生を防止することを技術
課題とする。That is, in the above conventional example, these two flows form the main flow of the cooling water W, and the flow to the other branch passages has a slow flow velocity. For this reason, it is not possible to sufficiently cool the periphery of the sub-combustion chamber 15 and the space between the intake valve port 13a and the exhaust valve port 14a, and the space between the sub-combustion chamber 15 and the exhaust valve port 14a or between the sub-combustion chamber 15 and the intake valve port 13a. Cracks tend to occur between the exhaust valve port 14a and the exhaust valve port 14a. The present invention has been made in view of such circumstances, and it is an object of the present invention to prevent occurrence of the crack.

【００１０】[0010]

【課題を解決するための手段】上記課題を解決するため
に、本発明が採用した手段は、上記従来の水冷式多気筒
ディーゼルエンジンのシリンダヘッドにおいて、上記吸
気ポート１３の下側通路１２ｂに臨ませてあけた冷却水
上昇孔４ａと副燃焼室１５の外側通路１２ｃに臨ませて
あけた冷却水上昇孔５ａのうち、ジャケット出口１６よ
りみて最上流側から半数に相当する冷却水上昇孔４ａ・
５ａは、これに対応する上記ガスケット３の冷却水上昇
孔４・５の孔径を大きくするとともに、その余の冷却水
上昇孔４・５・６は小さくすることで、上記冷却水上昇
孔４ａ・５ａを相対的に大きい孔径に設定し、上記通路
１２ａ〜１２ｆのうち、上記副燃焼室１５の外側通路１
２ｃから吸気ポート１３の下側通路１２ｂを通る冷却水
Ｗの流れを第１の流れ１２Ａと規定し、上記副燃焼室１
５と排気弁口１４ａとの間の通路１２ｆ、及び二つの吸
気弁口１３ａ・１３ｂの間の通路１２ｅを通る冷却水Ｗ
の流れを第２の流れ１２Ｂと規定し、上記排気ポート１
４の下側通路１２ａと上側通路１２ｄを通る冷却水Ｗの
流れを第３の流れ１２Ｃと規定し、上記副燃焼室１５と
吸気弁口１３ｂとの間を遮断壁２１で、シリンダボア８
・８間の上側に位置する一方のヘッド固定ボルト用ボス
部１９と吸気弁口１３ｂとの間を遮断壁２２で、それぞ
れ遮断することにより、上記第１の流れ１２Ａを形成す
るとともに、上記ボス部１９と副燃焼室１５との間より
第１の流れ１２Ａを分流させて上記第２の流れ１２Ｂと
合流させ、上記シリンダボア８・８間の上側に位置する
一対のヘッド固定ボルト用ボス部１９・１９間に、一対
の絞りボス部２３・２３を対向させて突設することによ
り、第２の流れ１２Ｂの上記合流部での分流を規制する
ように構成したことを要旨とするものである。In order to solve the above-mentioned problems, a means adopted by the present invention is directed to the lower passage 12b of the intake port 13 in the cylinder head of the conventional water-cooled multi-cylinder diesel engine. Of the cooling water rising holes 4a and the cooling water rising holes 5a opened to the outside passage 12c of the sub-combustion chamber 15, the cooling water rising holes 4a correspond to half of the cooling water rising holes 4a from the most upstream side as viewed from the jacket outlet 16.・
5a is to increase the diameter of the corresponding cooling water rising holes 4 and 5 of the gasket 3 and to make the remaining cooling water rising holes 4 and 5 and 6 smaller. 5a is set to a relatively large hole diameter, and among the passages 12a to 12f, the outer passage 1 of the auxiliary combustion chamber 15 is set.
The flow of the cooling water W from the second combustion chamber 2c through the lower passage 12b of the intake port 13 is defined as a first flow 12A,
Cooling water W passing through a passage 12f between the exhaust valve port 5 and the exhaust valve port 14a and a passage 12e between the two intake valve ports 13a and 13b.
Is defined as a second flow 12B, and the exhaust port 1
The flow of the cooling water W passing through the lower passage 12a and the upper passage 12d is defined as a third flow 12C, and the space between the sub-combustion chamber 15 and the intake valve port 13b is blocked by the cylinder bore 8 through the shut-off wall 21.
The first flow 12A is formed by shutting off the space between one of the head fixing bolt boss portions 19 located above the gap 8 and the intake valve port 13b with the shut-off wall 22. The first flow 12A is split from the portion between the portion 19 and the sub-combustion chamber 15 and merges with the second flow 12B to form a pair of head fixing bolt boss portions 19 located above the cylinder bores 8,8. The gist of the invention is that a pair of throttle bosses 23, 23 are protruded between 19 to restrict the branching of the second flow 12B at the junction. .

【００１１】[0011]

【発明の作用・効果】本発明によれば、ジャケット出口
１６よりみて最上流側から半数に相当する冷却水上昇孔
４ａ・５ａは、これに対応する上記ガスケット３の冷却
水上昇孔４・５の孔径を大きくし、その余の冷却水上昇
孔４・５・６を小さくすることで、上記冷却水上昇孔４
ａ・５ａを相対的に大きい孔径に設定されており、これ
らの冷却水上昇孔４ａ・５ａから吐出した冷却水Ｗは二
手に分かれる。即ち、一方は副燃焼室１５の外側通路１
２ｃから吸気ポート１３の下側通路１２ｂを通る第１の
流れ１２Ａを形成し、他方は副燃焼室１５とヘッド固定
ボルト用ボス部１９の間を高い流速で通り第二の流れ１
２Ｂに合流する。According to the present invention, the cooling water rising holes 4a and 5a corresponding to half of the cooling water rising holes 4a and 5a of the gasket 3 correspond to the cooling water rising holes 4 and 5a. By increasing the hole diameter of the cooling water rising holes 4, 5 and 6, the cooling water rising holes 4
The cooling water W discharged from these cooling water rising holes 4a and 5a is divided into two parts. That is, one is the outer passage 1 of the auxiliary combustion chamber 15.
2c forms a first flow 12A passing through the lower passage 12b of the intake port 13 while the other flows at a high flow rate between the sub-combustion chamber 15 and the boss 19 for the head fixing bolt.
Merge into 2B.

【００１２】上記第１の流れ１２Ａは、副燃焼室１５と
吸気弁口１３ｂとの間を遮断壁２１で、シリンダボア８
・８間の上側に位置する一方のヘッド固定ボルト用ボス
部１９と吸気弁口１３ｂとの間を遮断壁２２で、それぞ
れ遮断することにより形成される。また、上記シリンダ
ボア８・８間の上側に位置する一対のヘッド固定ボルト
用ボス部１９・１９間に、一対の絞りボス部２３・２３
を対向させて突設することにより、上記第二の流れ１２
Ｂの上記合流部での分流が規制される。これにより、熱
負荷の大きい副燃焼室１５と排気弁口１４ａとの間の通
路１２ｆを、冷却水Ｗが速い流速で流れる。The first flow 12A is formed by a cylinder wall 8 between a sub-combustion chamber 15 and an intake valve port 13b by a blocking wall 21.
The shield wall 22 blocks each of the boss portions 19 for the head fixing bolts located on the upper side between the two and the intake valve port 13b. Also, between a pair of head fixing bolt bosses 19, 19 located above the cylinder bores 8, a pair of drawing bosses 23, 23 are provided.
Are projected to face each other, so that the second flow 12
The branching of B at the junction is regulated. Thereby, the cooling water W flows at a high flow velocity through the passage 12f between the sub-combustion chamber 15 having a large heat load and the exhaust valve port 14a.

【００１３】次いで第二の流れ１２Ｂを形成する冷却水
Ｗの一部は、二つの吸気弁口１３ａ・１３ｂの上流側で
分流して、熱負荷の高い吸気弁口１３ａと排気弁口１４
ａとの間を通り、第三の流れ１２Ｃと合流する。これに
より、熱負荷の大きい副燃焼室１５の周囲や吸気弁口１
３ａと排気弁口１４ａとの間を十分に冷却することがで
き、副燃焼室１５と排気弁口１４ａとの間や吸気弁口１
３ａと排気弁口１４ａとの間にクラックが生じるのを効
果的に防止することができる。Next, a part of the cooling water W forming the second flow 12B is divided upstream of the two intake valve ports 13a and 13b, and the intake valve port 13a and the exhaust valve port 14 having a high heat load are separated.
a and merges with the third stream 12C. Thereby, the surroundings of the sub-combustion chamber 15 with a large heat load and the intake valve port 1
3a and the exhaust valve port 14a can be sufficiently cooled, and the space between the sub-combustion chamber 15 and the exhaust valve port 14a and the intake valve port 1a can be sufficiently cooled.
It is possible to effectively prevent a crack from occurring between the exhaust valve 3a and the exhaust valve port 14a.

【００１４】[0014]

【実施例】以下本発明の実施例を図面に基づいてさらに
詳しく説明する。図１は本発明の実施例に係るシリンダ
ヘッド１０を示し、同図(Ａ)は上記シリンダブロックと
シリンダヘッドとの間に介在するガスケットの平面図、
同図(Ｂ)はシリンダヘッドの要部横断平面図、同図(Ｃ)
は同図(Ｂ)のＣ−Ｃ線縦断面図、同図(Ｄ)は同図(Ｂ)の
Ｄ−Ｄ線縦断面図、同図(Ｅ)は同図(Ｂ)のＥ−Ｅ線縦断
面図である。このシリンダヘッド１０の基本構造は、前
記従来のシリンダヘッド（図２）と同様であり、同一部
材については同一符号を付して重複する説明を省略す
る。Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 shows a cylinder head 10 according to an embodiment of the present invention. FIG. 1A is a plan view of a gasket interposed between the cylinder block and the cylinder head.
FIG. 4B is a cross-sectional plan view of a main part of the cylinder head, and FIG.
Is a vertical cross-sectional view taken along line CC of FIG. 1B, FIG. 2D is a vertical cross-sectional view taken along line DD of FIG. 1B, and FIG. 1E is EE of FIG. 1B. It is a line longitudinal cross-sectional view. The basic structure of the cylinder head 10 is the same as that of the conventional cylinder head (FIG. 2), and the same members are denoted by the same reference numerals and overlapping description will be omitted.

【００１５】以下、本発明の特徴構造について説明す
る。このシリンダヘッド１０は、図１で示すように、吸
気ポート１３の下側通路１２ｂに臨ませてあけた冷却水
上昇孔４ａと副燃焼室１５の外側通路１２ｃに臨ませて
あけた冷却水上昇孔５ａとは、排気弁口１４ａから最も
遠ざかる位置に開口し、かつ、これらの冷却水上昇孔４
ａ・５ａのうち、ジャケット出口１６よりみて最上流側
から半数に相当する冷却水上昇孔４ａ・５ａは、これに
対応する上記ガスケット３の冷却水上昇孔４・５の孔を
大きくするとともに、その余の冷却水上昇孔４・５・６
をエアー抜き程度の小さい孔とすることで、上記冷却水
上昇孔４ａ・５ａを相対的に大きい孔径に設定してあ
る。Hereinafter, the characteristic structure of the present invention will be described. As shown in FIG. 1, the cylinder head 10 has a cooling water rising hole 4 a opened to the lower passage 12 b of the intake port 13 and a cooling water rising opening opened to the outer passage 12 c of the sub-combustion chamber 15. The hole 5a is open at a position farthest from the exhaust valve port 14a, and
Of the a.5a, the cooling water rising holes 4a and 5a corresponding to half of the cooling water rising holes 4a and 5a from the most upstream side as viewed from the jacket outlet 16 increase the size of the corresponding cooling water rising holes 4 and 5 of the gasket 3, Other cooling water rising holes 4, 5, 6
Are made small holes for air release, so that the cooling water rising holes 4a and 5a are set to have relatively large hole diameters.

【００１６】これは副燃焼室１５の近傍で、上流側の冷
却水上昇孔４ａ・５ａからより多量の冷却水Ｗを吐出さ
せて、前記第一の流れ１２Ａ・第二の流れ１２Ｂ・第三
の流れ１２Ｃを形成し易くするためである。また、図１
(Ｂ)で示すように、上記副燃焼室１５と吸気弁口１３ｂ
との間は遮断壁２１で、シリンダボア８・８間の上側に
位置する一方のヘッド固定ボルト用ボス部１９と吸気弁
口１３ｂとの間は遮断壁２２で、それぞれ遮断する。こ
れにより、上記ボス部１９と副燃焼室１５との間より第
１の流れ１２Ａを分流させて、上記第２の流れ１２Ｂと
合流させるのである。In the vicinity of the sub-combustion chamber 15, a larger amount of cooling water W is discharged from the cooling water rising holes 4a and 5a on the upstream side, so that the first flow 12A, the second flow 12B and the third flow 12B. This is for making it easier to form the flow 12C. FIG.
As shown in (B), the auxiliary combustion chamber 15 and the intake valve port 13b
Is cut off by a shut-off wall 21, and one of the head fixing bolt boss portions 19 located above the cylinder bores 8, 8 is shut off by a shut-off wall 22 by the shut-off wall 22. As a result, the first flow 12A is split from the space between the boss 19 and the sub-combustion chamber 15, and merges with the second flow 12B.

【００１７】さらに、上記シリンダボア８・８間の上側
に位置する一対のヘッド固定ボルト用ボス部１９・１９
の間に、一対の絞りボス部２３・２３を対向させて突設
する。これにより、第２の流れ１２Ｂの上記合流部での
分流を規制し、第二の流れ１２Ｂを形成する冷却水Ｗ
を、副燃焼室１５と排気弁口１４ａとの間の通路１２ｆ
より速い流速で流すのである。Further, a pair of head fixing bolt boss portions 19, 19 located on the upper side between the cylinder bores 8, 8 are provided.
A pair of aperture bosses 23 are provided so as to face each other. Thereby, the branch flow of the second flow 12B at the junction is regulated, and the cooling water W forming the second flow 12B is formed.
To the passage 12f between the auxiliary combustion chamber 15 and the exhaust valve port 14a.
Flow at a faster flow rate.

【００１８】上記のように本発明によれば、上記通路１
２ａ〜１２ｆのうち、冷却水Ｗが上記副燃焼室１５の外
側通路１２ｃから吸気ポート１３の下側通路１２ｂを通
る第１の流れ１２Ａと、上記副燃焼室１５と排気弁口１
４ａとの間の通路１２ｆ及び二つの吸気弁口１３ａ・１
３ｂの間の通路１２ｅを通る第２の流れ１２Ｂと、上記
排気ポート１４の下側通路１２ａと上側通路１２ｄを通
る第３の流れ１２Ｃとが形成される。これらの３つの流
れはジャケット出口１６で合流し、前記ラジェータ３２
へ向けて還流される。According to the present invention as described above, the passage 1
2a to 12f, a first flow 12A in which the cooling water W passes from the outer passage 12c of the sub-combustion chamber 15 through the lower passage 12b of the intake port 13, and the sub-combustion chamber 15 and the exhaust valve port 1
12a and two intake valve ports 13a.1
A second flow 12B passing through the passage 12e between the passages 3b and a third flow 12C passing through the lower passage 12a and the upper passage 12d of the exhaust port 14 are formed. These three streams merge at the jacket outlet 16 and the radiator 32
Refluxed toward.

【００１９】上記第１の流れ１２Ａを形成する冷却水Ｗ
の一部は、副燃焼室１５とヘッド固定ボルト用ボス部１
９との間を通り上記第二の流れ１２Ｂと合流する。ま
た、上記第二の流れ１２Ｂの上記合流部での分流が前記
一対の絞りボス部２３・２３で規制され、第二の流れ１
２Ｂを形成する冷却水Ｗは、副燃焼室１５と排気弁口１
４ａとの間を速い流速で流通する。さらに、第二の流れ
１２Ｂを形成する冷却水Ｗの一部は、二つの吸気弁口１
３ａ・１３ｂの上流側で分流して、吸気弁口１３ａと排
気弁口１４ａとの間を通って、上記第三の流れ１２Ｃと
合流する。The cooling water W forming the first stream 12A
Of the sub-combustion chamber 15 and the boss 1 for the head fixing bolt
9 and merges with the second stream 12B. In addition, the branch of the second flow 12B at the junction is regulated by the pair of throttle bosses 23, and the second flow 1B is restricted.
The cooling water W forming the second combustion chamber 2B is formed between the auxiliary combustion chamber 15 and the exhaust valve port 1.
4a at a high flow rate. Further, a part of the cooling water W forming the second flow 12B is divided into two intake valve ports 1.
The flow is branched upstream of the flow passages 3a and 13b, passes between the intake valve port 13a and the exhaust valve port 14a, and merges with the third flow 12C.

【００２０】これにより、熱負荷の高い副燃焼室１５の
周囲や吸気弁口１３ａと排気弁口１４ａとの間を十分に
冷却することができ、副燃焼室１５と排気弁口１４ａと
の間や吸気弁口１３ａと排気弁口１４ａとの間にクラッ
クが生じるのを効果的に防止することができる。なお、
上記副燃焼室１５は、予燃焼室式のものや渦流室式のも
のを含む。また、シリンダヘッドは３気筒型に限るもの
ではなく、４気筒型のシリンダヘッドについても適宜変
更を加えて実施し得ることは多言を要しない。As a result, it is possible to sufficiently cool the periphery of the sub-combustion chamber 15 having a high heat load and the space between the intake valve port 13a and the exhaust valve port 14a. Also, it is possible to effectively prevent a crack from being generated between the intake valve port 13a and the exhaust valve port 14a. In addition,
The auxiliary combustion chamber 15 includes a pre-combustion chamber type and a vortex chamber type. The cylinder head is not limited to the three-cylinder type, and it is not necessary to say that the four-cylinder type cylinder head can be implemented with appropriate changes.

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

【図１】本発明の実施例に係るシリンダヘッドを示し、
同図(Ａ)はシリンダブロックとシリンダヘッドとの間に
介在するガスケットの平面図、同図(Ｂ)はシリンダヘッ
ドの要部横断平面図、同図(Ｃ)は同図(Ｂ)のＣ−Ｃ線縦
断面図、同図(Ｄ)は同図(Ｂ)のＤ−Ｄ線縦断面図、同図
(Ｅ)は同図(Ｂ)のＥ−Ｅ線縦断面図である。FIG. 1 shows a cylinder head according to an embodiment of the present invention,
FIG. 2A is a plan view of a gasket interposed between a cylinder block and a cylinder head, FIG. 2B is a cross-sectional plan view of a main part of the cylinder head, and FIG. FIG. 3D is a vertical sectional view taken along the line C-D, and FIG.
(E) is a vertical sectional view taken along line EE of FIG.

【図２】従来例に係るシリンダヘッドを示し、図１に相
当する図である。FIG. 2 is a view showing a cylinder head according to a conventional example and corresponding to FIG.

【図３】水冷式多気筒ディーゼルエンジンの冷却装置の
概要図である。FIG. 3 is a schematic diagram of a cooling device for a water-cooled multi-cylinder diesel engine.

【符号の説明】[Explanation of symbols]

Ｗ…冷却水、 ３…ガスケット、4・
5・6…ガスケットの冷却水上昇孔、4a・5a・6a…シリンダヘ
ッドの冷却水上昇孔、 ８…シリンダボア、 １０…シリンダヘッ
ド、１２…ヘッドジャケット、 １２Ａ…冷却水
Ｗの第１の流れ、１２Ｂ…冷却水Ｗの第二の流れ、 １
２ｂ…吸気ポートの下側通路、１２Ｃ…冷却水Ｗの第三
の流れ、 １２ｃ…副燃焼室の外側通路、12d・12e・12f
…冷却水の通路、 １３…吸気ポート、１３ａ…吸
気弁口、 １４…排気ポート、１４ａ…排
気弁口、 １５…副燃焼室、１６…ジャケ
ット出口、 １９…ヘッド固定ボルト用ボス
部、２１・２２…遮断壁、 ２３…絞りボス
部。W: cooling water, 3: gasket, 4.
5 ・ 6 ・ ・ ・ Cooling water rising hole of gasket, 4a ・ 5a ・ 6a ・ ・ ・ Cylinder head cooling water rising hole, 8 ・ ・ ・ Cylinder bore, 10 ・ ・ ・ Cylinder head, 12 ・ ・ ・ Head jacket, 12A ・ ・ ・ First flow of cooling water W, 12B: second flow of cooling water W, 1
2b: lower passage of intake port, 12C: third flow of cooling water W, 12c: outer passage of sub-combustion chamber, 12d, 12e, 12f
... Cooling water passage, 13 ... Intake port, 13a ... Intake valve port, 14 ... Exhaust port, 14a ... Exhaust valve port, 15 ... Subcombustion chamber, 16 ... Jack outlet, 19 ... Boss part for head fixing bolt, 21 22: blocking wall, 23: iris boss.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 三雲 博 大阪府堺市石津北町64 株式会社クボタ 堺製造所内 (56)参考文献 実開 昭55−132343（ＪＰ，Ｕ) 実開 昭60−153845（ＪＰ，Ｕ) 実開 昭49−135641（ＪＰ，Ｕ) 実開 昭57−80615（ＪＰ，Ｕ) 実開 昭54−169605（ＪＰ，Ｕ) 実開 平４−117164（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Mikumo 64 Ishizukita-cho, Sakai-shi, Osaka Kubota Sakai Works Co., Ltd. (56) References Shokai 55-132343 (JP, U) Shokai Sho 60-153845 ( JP, U) Japanese Utility Model Showa 49-135641 (JP, U) Japanese Utility Model Showa 57-80615 (JP, U) Japanese Utility Model Showa 54-169605 (JP, U) Japanese Utility Model Utility Model 4-117164 (JP, U)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 二つの吸気弁口(13a)(13b)と一つの排気
弁口(14a)と副燃焼室(15)とを各シリンダボア(８)の上
側に配置し、各吸気ポート(13)は、各副燃焼室(15)の横
側を通ってボア配列方向と交差する方向に走らせてヘッ
ド一側面に開口するとともに、各排気ポート(14)は吸気
ポート(13)と反対方向に走らせてヘッド他側面に開口し
て多気筒３弁型シリンダヘッド１０を構成し、 上記シリンダヘッド(10)内にヘッドジャケット(12)を形
成し、このヘッドジャケット(12)は、シリンダヘッド(1
0)の一端に開口したジャケット出口(16)に連通するとと
もに、吸気ポート(13)・排気ポート(14)・副燃焼室(15)
により分岐された複数の通路(12a〜12f)から成り、 上記シリンダヘッド(10)の下面に、ガスケット(３)の冷
却水上昇孔(4・5・6)に対応させて複数の冷却水上昇孔(4a
・5a・6a)をあけ、これらの冷却水上昇孔(4a・5a・6a)は、
吸気ポート(13)の下側通路(12b)に臨ませてあけた冷却
水上昇孔(4a)と、副燃焼室(15)の外側通路(12c)に臨ま
せてあけた冷却水上昇孔(5a)と、排気ポート(14)の下側
通路(12a)に臨ませてあけた冷却水上昇孔(6a)とから成
り、 上記ガスケット(３)の冷却水上昇孔(4・5・6)の孔径の大
きさを適宜設定することにより、シリンダブロックから
シリンダヘッド(10)へ上昇する冷却水(Ｗ)の流量を設定
するように構成した水冷式多気筒ディーゼルエンジンの
シリンダヘッドにおいて、 上記吸気ポート(13)の下側通路(12b)に臨ませてあけた
冷却水上昇孔(4a)と副燃焼室(15)の外側通路(12c)に臨
ませてあけた冷却水上昇孔(5a)のうち、ジャケット出口
(16)よりみて最上流側から半数に相当する冷却水上昇孔
(4a)・(5a)は、これに対応する上記ガスケット(３)の冷
却水上昇孔(４)・(５)の孔径を大きくするとともに、そ
の余の冷却水上昇孔(４)・(５)・(６)は小さくすること
で、上記冷却水上昇孔(4a)・(5a)を相対的に大きい孔径
に設定し、 上記通路(12a〜12f)のうち、上記副燃焼室(15)の外側通
路(12c)から吸気ポート(13)の下側通路(12b)を通る冷却
水Ｗの流れを第１の流れ(12A)と規定し、 上記副燃焼室(15)と排気弁口(14a)との間の通路(12f)、
及び二つの吸気弁口(13a)・(13b)の間の通路(12e)を通る
冷却水Ｗの流れを第２の流れ(12B)と規定し、 上記排気ポート(14)の下側通路(12a)と上側通路(12d)を
通る冷却水Ｗの流れを第３の流れ(12B)と規定し、 上記副燃焼室(15)と吸気弁口(13b)との間を遮断壁(21)
で、シリンダボア(８)・(８)間の上側に位置する一方の
ヘッド固定ボルト用ボス部(19)と吸気弁口(13b)との間
を遮断壁(22)で、それぞれ遮断することにより、上記第
１の流れ(12A)を形成するとともに、上記ボス部(19)と
副燃焼室(15)との間より第１の流れ(12A)を分流させて
上記第２の流れ(12B)と合流させ、 上記シリンダボア(８)・(８)間の上側に位置する一対の
ヘッド固定ボルト用ボス部(19)・(19)間に、一対の絞り
ボス部(23)・(23)を対向させて突設することにより、第
２の流れ(12B)の上記合流部での分流を規制するように
構成したことを特徴とする水冷式多気筒ディーゼルエン
ジンのシリンダヘッド。An intake valve port (13a) (13b), an exhaust valve port (14a), and a sub-combustion chamber (15) are arranged above each cylinder bore (8), and each intake port (13 ) Runs in the direction crossing the bore arrangement direction through the side of each sub-combustion chamber (15) and opens on one side of the head, and each exhaust port (14) is in the opposite direction to the intake port (13). The multi-cylinder three-valve cylinder head 10 is formed by running and opening to the other side of the head, and a head jacket (12) is formed in the cylinder head (10).
In addition to communicating with the jacket outlet (16) opened at one end of (0), the intake port (13), the exhaust port (14), and the auxiliary combustion chamber (15)
A plurality of passages (12a to 12f) branched by a plurality of cooling water rising holes (4, 5, 6) on the lower surface of the cylinder head (10) corresponding to the cooling water rising holes (4, 5, 6) of the gasket (3). Hole (4a
・ 5a ・ 6a), and these cooling water rising holes (4a ・ 5a ・ 6a)
A cooling water rise hole (4a) opened to the lower passage (12b) of the intake port (13) and a cooling water rise hole (4C) opened to the outer passage (12c) of the sub-combustion chamber (15). 5a) and a cooling water rising hole (6a) opened to the lower passage (12a) of the exhaust port (14), and the cooling water rising hole (4, 5, 6) of the gasket (3) is formed. In the cylinder head of a water-cooled multi-cylinder diesel engine configured to set the flow rate of the cooling water (W) rising from the cylinder block to the cylinder head (10) by appropriately setting the size of the hole diameter of the intake air, Cooling water rising hole (4a) opened to the lower passage (12b) of the port (13) and cooling water rising hole (5a) opened to the outer passage (12c) of the auxiliary combustion chamber (15) Out of the jacket
(16) Cooling water rise hole equivalent to half from the most upstream side
(4a) and (5a) are to increase the diameters of the corresponding cooling water riser holes (4) and (5) of the gasket (3) and to provide the remaining cooling water riser holes (4) and (5). (6) is reduced so that the cooling water rising holes (4a) and (5a) are set to have relatively large diameters, and among the passages (12a to 12f), the auxiliary combustion chamber (15) The flow of the cooling water W from the outer passage (12c) through the lower passage (12b) of the intake port (13) is defined as a first flow (12A), and the auxiliary combustion chamber (15) and the exhaust valve port ( Passage (12f) to 14a),
The flow of the cooling water W passing through the passage (12e) between the two intake valve ports (13a) and (13b) is defined as a second flow (12B), and the lower passage ( A flow of the cooling water W passing through the upper passage (12a) and the upper passage (12d) is defined as a third flow (12B), and a barrier (21) is provided between the auxiliary combustion chamber (15) and the intake valve port (13b).
By shutting off between the one head fixing bolt boss (19) located above the cylinder bores (8) and (8) and the intake valve port (13b) with the shutoff wall (22), respectively. , Forming the first flow (12A) and dividing the first flow (12A) from between the boss portion (19) and the auxiliary combustion chamber (15) to form the second flow (12B). And a pair of throttle bosses (23) and (23) between a pair of head fixing bolt bosses (19) and (19) located above the cylinder bores (8) and (8). A cylinder head for a water-cooled multi-cylinder diesel engine, characterized in that the cylinder head is formed so as to oppose and protrude so as to regulate the branch of the second flow (12B) at the junction.
JP5027520A 1993-01-22 1993-01-22 Cylinder head for water-cooled multi-cylinder diesel engine Expired - Lifetime JP2753785B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5027520A JP2753785B2 (en) 1993-01-22 1993-01-22 Cylinder head for water-cooled multi-cylinder diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5027520A JP2753785B2 (en) 1993-01-22 1993-01-22 Cylinder head for water-cooled multi-cylinder diesel engine

Publications (2)

Publication Number Publication Date
JPH06221149A JPH06221149A (en) 1994-08-09
JP2753785B2 true JP2753785B2 (en) 1998-05-20

Family

ID=12223406

Family Applications (1)

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JP6267621B2 (en) 2014-10-10 2018-01-24 株式会社クボタ Engine cylinder head cooling system
CN109882307A (en) * 2019-03-05 2019-06-14 广西玉柴机器股份有限公司 A kind of engine cylinder cap water route throttle structure

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