JPH09324695A - Structure of cylinder head in internal combustion engine - Google Patents
Structure of cylinder head in internal combustion engineInfo
- Publication number
- JPH09324695A JPH09324695A JP14268296A JP14268296A JPH09324695A JP H09324695 A JPH09324695 A JP H09324695A JP 14268296 A JP14268296 A JP 14268296A JP 14268296 A JP14268296 A JP 14268296A JP H09324695 A JPH09324695 A JP H09324695A
- Authority
- JP
- Japan
- Prior art keywords
- cooling water
- cylinder head
- opening
- water jacket
- 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.)
- Pending
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
- 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
- F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
-
- 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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ディーゼル機関等
の内燃機関において、その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 the structure of a cylinder head of an internal combustion engine such as a diesel engine.
【０００２】[0002]
【従来の技術】一般に、内燃機関におけるシリンダヘッ
ドのうち吸気弁と排気弁との間の部分は、肉厚状になっ
ていることにより、この弁間部分に熱応力に起因する亀
裂が発生することになる。そこで、従来は、例えば、実
開平１−６１４２５号公報等に記載されているように、
前記弁間部分に、冷却水通路を、その一端がシリンダブ
ロックにおける冷却水ジャケットに連通し、他端がシリ
ンダヘッド内の冷却水ジャケットに開口するように設け
ることによって、前記弁間部分に亀裂が発生することを
防止するようにしている。2. Description of the Related Art Generally, in a cylinder head of an internal combustion engine, a portion between an intake valve and an exhaust valve is thick, so that a crack due to thermal stress occurs in the intervalve portion. It will be. Therefore, conventionally, for example, as described in Japanese Utility Model Publication No. 1-61425,
By providing a cooling water passage in the intervalve portion so that one end thereof communicates with the cooling water jacket in the cylinder block and the other end opens to the cooling water jacket in the cylinder head, a crack is formed in the intervalve portion. I try to prevent it from happening.
【０００３】[0003]
【発明が解決しようとする課題】しかし、シリンダヘッ
ドにおける冷却水ジャケットは、シリンダブロックにお
ける冷却水ジャケットからの冷却水が気筒列の方向に流
れるように構成していることにより、前記弁間部分に設
けた冷却水通路の一端を、前記シリンダヘッドにおける
冷却水ジャケット内に開口しただけの構成であると、こ
の冷却水通路のシリンダヘッドにおける冷却水ジャケッ
ト内への開口部に、シリンダヘッドにおける冷却水ジャ
ケット内を気筒列の方向に流れる冷却水の動圧が直撃す
ることにより、当該開口部からの冷却水の流出量が減少
し、ひいては、前記弁間部分に設けた冷却水通路内を流
れる冷却水の流量が減少することになるから、前記弁間
部分に冷却水通路を設けたことによる弁間亀裂の発生防
止を充分に達成できないと言う問題があった。However, the cooling water jacket in the cylinder head is configured so that the cooling water from the cooling water jacket in the cylinder block flows in the direction of the cylinder rows, so that the intervalve portion is formed. If only one end of the provided cooling water passage is opened in the cooling water jacket of the cylinder head, the cooling water in the cylinder head is opened at the opening of the cooling water passage in the cylinder head. When the dynamic pressure of the cooling water flowing in the direction of the cylinder rows in the jacket is directly hit, the outflow amount of the cooling water from the opening is reduced, and the cooling flowing in the cooling water passage provided in the intervalve portion Since the flow rate of water will decrease, it is possible to sufficiently prevent the occurrence of intervalve cracks by providing a cooling water passage in the intervalve portion. There has been a problem to say that there is no.
【０００４】本発明は、この問題を解消し、弁間部分に
設けた冷却水通路による弁間亀裂の発生防止を効果的に
達成できるようにすることを技術的課題とするものであ
る。An object of the present invention is to solve this problem and effectively prevent the occurrence of intervalve cracks by the cooling water passage provided in the intervalve portion.
【０００５】[0005]
【課題を解決するための手段】この技術的課題を達成す
るため本発明は、「多気筒内燃機関におけるシリンダヘ
ッドのうち吸気弁と排気弁との間の弁間部分に、冷却水
通路を、その一端がシリンダブロックにおける冷却水ジ
ャケットに連通し、他端がシリンダヘッドにおける冷却
水ジャケット内に開口するように設けて成るシリンダヘ
ッドにおいて、前記シリンダヘッドにおける冷却水ジャ
ケットの内面のうち、当該冷却水ジャケット内における
冷却水の流れ方向に対して前記冷却水通路の開口部より
も上流側で、且つ、この開口部に隣接した部分に、衝立
体を、前記冷却水の流れを横切るように設ける。」と言
う構成にした。In order to achieve this technical object, the present invention provides a cooling water passage in a valve head portion between an intake valve and an exhaust valve of a cylinder head in a multi-cylinder internal combustion engine. A cylinder head having one end communicating with a cooling water jacket in a cylinder block and the other end opening into a cooling water jacket in a cylinder head, wherein the cooling water is the inner surface of the cooling water jacket in the cylinder head. An impact solid is provided in the jacket upstream of the opening of the cooling water passage with respect to the flow direction of the cooling water and in a portion adjacent to the opening so as to cross the flow of the cooling water. "."
【０００６】[0006]
【発明の作用・効果】このように、シリンダヘッドにお
ける冷却水ジャケットの内面のうち、当該冷却水ジャケ
ット内における冷却水の流れ方向に対して前記冷却水通
路の開口部よりも上流側で、且つ、この開口部に隣接し
た部分に、衝立体を、前記冷却水の流れを横切るように
設けることにより、シリンダヘッドにおける冷却水ジャ
ケット内を気筒列の方向に流れる冷却水は、前記弁間部
分に設けた冷却水通路の開口部より上流側に位置する前
記衝立体に当たって、前記冷却水通路の開口部よりそら
せることになるから、前記冷却水通路の開口部に対して
冷却水流の動圧が直撃することを確実に防止できる。As described above, the inner surface of the cooling water jacket in the cylinder head is located upstream of the opening of the cooling water passage with respect to the flow direction of the cooling water in the cooling water jacket, and By providing an impact solid in a portion adjacent to this opening so as to cross the flow of the cooling water, the cooling water flowing in the direction of the cylinder row in the cooling water jacket of the cylinder head is allowed to flow to the intervalve portion. Since the impact solid located upstream of the opening of the provided cooling water passage is deflected from the opening of the cooling water passage, the dynamic pressure of the cooling water flow directly hits the opening of the cooling water passage. Can be surely prevented.
【０００７】従って、本発明によると、弁間部分に設け
た冷却水通路内を流れる冷却水量がシリンダヘッドにお
ける冷却水ジャケット内を流れる冷却水の動圧のために
減少することを確実に回避できて、当該冷却水通路内を
流れる冷却水量の増大できるから、前記冷却水通路を設
けたことにより弁間亀裂の発生防止を効果的に達成でき
る効果を有する。Therefore, according to the present invention, it can be surely avoided that the amount of the cooling water flowing in the cooling water passage provided in the intervalve portion is decreased due to the dynamic pressure of the cooling water flowing in the cooling water jacket in the cylinder head. Since the amount of cooling water flowing in the cooling water passage can be increased, the provision of the cooling water passage has an effect of effectively preventing occurrence of intervalve cracks.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態を、渦
流式の副室を備えた多気筒ディーゼル機関に適用した場
合の図面について説明する。この図において、符号１は
シリンダブロックを、符号２はシリンダヘッドを各々示
し、このシリンダヘッド２は、前記シリンダブロック１
の上面に対して複数本のヘッドボルト３にて締結されて
いる。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings in the case of being applied to a multi-cylinder diesel engine having a swirl type auxiliary chamber. In this figure, reference numeral 1 indicates a cylinder block, reference numeral 2 indicates a cylinder head, and this cylinder head 2 is the cylinder block 1
The head bolts 3 are fastened to the upper surface of the.
【０００９】前記シリンダブロック１には、冷却水ジャ
ケット４が各気筒におけるシリンダボア５の外側を囲う
ように形成されている。一方、前記シリンダヘッド３に
は、吸気ポート６及び排気ポート７が形成されていると
共に、渦流式の副室８が形成され、また、その内部に
は、冷却水ジャケット９が、前記シリンダブロック１に
おける冷却水ジャケット４から当該冷却水ジャケット９
内に流入した冷却水が図２に矢印で示すように気筒列の
方向に流れるように形成されている。A cooling water jacket 4 is formed in the cylinder block 1 so as to surround the outside of a cylinder bore 5 in each cylinder. On the other hand, an intake port 6 and an exhaust port 7 are formed in the cylinder head 3, and a swirl type sub chamber 8 is formed in the cylinder head 3, and a cooling water jacket 9 is provided inside the sub chamber 8. Cooling water jacket 4 to cooling water jacket 9
The cooling water that has flowed in is formed so as to flow in the direction of the cylinder row as indicated by the arrow in FIG.
【００１０】更に、前記シリンダヘッド３の内部には、
補助冷却水ジャケット１０が、前記副室８を外側を通っ
て気筒列の方向に延びるように形成されている。更にま
た、前記シリンダヘッド２のうち吸気ポート６と排気ポ
ート７との間の弁間部分１１には、冷却水通路１２が、
その一端が前記シリンダブロック１における冷却水ジャ
ケット４に連通し、他端がシリンダヘッド２における冷
却水ジャケット９内に開口するように、ドリル加工によ
って設けられている。Further, inside the cylinder head 3,
An auxiliary cooling water jacket 10 is formed so as to extend through the sub chamber 8 in the cylinder array direction. Furthermore, a cooling water passage 12 is provided in an intervalve portion 11 of the cylinder head 2 between the intake port 6 and the exhaust port 7.
It is provided by drilling so that one end thereof communicates with the cooling water jacket 4 of the cylinder block 1 and the other end opens into the cooling water jacket 9 of the cylinder head 2.
【００１１】そして、前記シリンダヘッド２における冷
却水ジャケット９の内面のうち、当該冷却水ジャケット
９内における冷却水の流れ方向に対して前記冷却水通路
１２の開口部１２ａよりも上流側で、且つ、この開口部
１２ａに隣接した部分、つまり、前記排気ポート７と副
室８との間の部分に、衝立体１３を、当該冷却水ジャケ
ット９の底面９ａから立ち上がるように一体的に設ける
のである。Of the inner surface of the cooling water jacket 9 in the cylinder head 2, the upstream side of the opening 12a of the cooling water passage 12 with respect to the flow direction of the cooling water in the cooling water jacket 9, and At the portion adjacent to the opening 12a, that is, at the portion between the exhaust port 7 and the sub chamber 8, the impact solid 13 is integrally provided so as to rise from the bottom surface 9a of the cooling water jacket 9. .
【００１２】なお、この衝立体１３は、冷却水ジャケッ
ト９の天井面９ｂにまで達するように構成しても良い
が、天井面９ｂにまで達しない高さ寸法に構成しても良
い。このように構成することにより、シリンダヘッド２
における冷却水ジャケット９内を気筒列の方向に流れる
冷却水は、前記弁間部分１１に設けた冷却水通路１２の
開口部１２ａより上流側に位置する前記衝立体１３に当
たって、前記冷却水通路１２の開口部１２ａよりそらせ
ることになって、前記冷却水通路１２の開口部１２ａに
対して冷却水流の動圧が直撃することを確実に防止でき
るから、当該冷却水通路１２内を流れる冷却水量の増大
を確実に図ることができるのである。The impact solid 13 may be configured to reach the ceiling surface 9b of the cooling water jacket 9, but may be configured to have a height dimension that does not reach the ceiling surface 9b. With this configuration, the cylinder head 2
The cooling water flowing through the cooling water jacket 9 in the direction of the cylinder row hits the impact solid 13 located upstream of the opening 12a of the cooling water passage 12 provided in the intervalve portion 11, and the cooling water passage 12 Since it is possible to prevent the dynamic pressure of the cooling water flow from directly hitting the opening 12a of the cooling water passage 12 by deflecting it from the opening 12a, The increase can be surely achieved.
【００１３】また、前記実施の形態のように、シリンダ
ヘッド２の内部に、補助冷却水ジャケット１０を、前記
副室８を外側を通って気筒列の方向に延びるように形成
する一方、副室８と排気ポート７との間に設けた衝立体
１３を、冷却水ジャケット９の天井面９ｂにまで達する
ように構成することにより、冷却水を前記副室８の左右
両側に沿って流すことができるから、前記副室８に対す
る冷却性能を大幅に向上できると言う利点がある。Further, as in the above-described embodiment, the auxiliary cooling water jacket 10 is formed inside the cylinder head 2 so as to extend in the cylinder row direction through the sub chamber 8 outside. 8 is arranged so as to reach the ceiling surface 9b of the cooling water jacket 9 so that the cooling water can flow along the left and right sides of the sub chamber 8. Therefore, there is an advantage that the cooling performance for the sub chamber 8 can be significantly improved.
【図１】本発明の実施の形態を示す縦断正面図である。FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.
【図２】図１のII−II視平断面図である。FIG. 2 is a sectional plan view taken along the line II-II of FIG.
１ シリンダブロック ２ シリンダヘッド ３ ヘッドボルト ４ シリンダブロックの冷却水ジ
ャケット ６ 吸気ポート ７ 排気ポート ８ 副室 ９ シリンダヘッドの冷却水ジャ
ケット １０ 補助冷却水ジャケット １１ 弁間部分 １２ 冷却水通路 １２ａ 冷却水通路の開口部 １３ 衝立体1 Cylinder Block 2 Cylinder Head 3 Head Bolt 4 Cylinder Block Cooling Water Jacket 6 Intake Port 7 Exhaust Port 8 Sub-chamber 9 Cylinder Head Cooling Water Jacket 10 Auxiliary Cooling Water Jacket 11 Intervalve 12 Cooling Water Passage 12a Cooling Water Passage Aperture 13 impact solid
Claims (1)
うち吸気弁と排気弁との間の弁間部分に、冷却水通路
を、その一端がシリンダブロックにおける冷却水ジャケ
ットに連通し、他端がシリンダヘッドにおける冷却水ジ
ャケット内に開口するように設けて成るシリンダヘッド
において、 前記シリンダヘッドにおける冷却水ジャケットの内面の
うち、当該冷却水ジャケット内における冷却水の流れ方
向に対して前記冷却水通路の開口部よりも上流側で、且
つ、この開口部に隣接した部分に、衝立体を、前記冷却
水の流れを横切るように設けたことを特徴とする内燃機
関におけるシリンダヘッドの構造。1. A multi-cylinder internal combustion engine includes a cylinder head having a cooling water passage at an intervalve portion between an intake valve and an exhaust valve, one end of which communicates with a cooling water jacket of a cylinder block and the other end of which is a cylinder. A cylinder head provided so as to open in a cooling water jacket in the head, wherein an opening of the cooling water passage is formed in an inner surface of the cooling water jacket in the cylinder head with respect to a flow direction of the cooling water in the cooling water jacket. A structure of a cylinder head in an internal combustion engine, wherein an impact solid is provided upstream of the portion and adjacent to the opening so as to cross the flow of the cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14268296A JPH09324695A (en) | 1996-06-05 | 1996-06-05 | Structure of cylinder head in internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14268296A JPH09324695A (en) | 1996-06-05 | 1996-06-05 | Structure of cylinder head in internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09324695A true JPH09324695A (en) | 1997-12-16 |
Family
ID=15321078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14268296A Pending JPH09324695A (en) | 1996-06-05 | 1996-06-05 | Structure of cylinder head in internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09324695A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1736660A2 (en) | 2005-06-23 | 2006-12-27 | MAN Nutzfahrzeuge AG | Culasse pour un moteur à combustion interne |
| JP2016079814A (en) * | 2014-10-10 | 2016-05-16 | 株式会社クボタ | Engine cylinder head cooling device |
| US11008972B2 (en) * | 2016-09-20 | 2021-05-18 | Cummins Inc. | Systems and methods for avoiding structural failure resulting from hot high cycles using a cylinder head cooling arrangement |
-
1996
- 1996-06-05 JP JP14268296A patent/JPH09324695A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1736660A2 (en) | 2005-06-23 | 2006-12-27 | MAN Nutzfahrzeuge AG | Culasse pour un moteur à combustion interne |
| AT502089B1 (en) * | 2005-06-23 | 2007-07-15 | Man Nutzfahrzeuge Ag | CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE |
| EP1736660A3 (en) * | 2005-06-23 | 2007-12-12 | MAN Nutzfahrzeuge AG | Culasse pour un moteur à combustion interne |
| JP2016079814A (en) * | 2014-10-10 | 2016-05-16 | 株式会社クボタ | Engine cylinder head cooling device |
| US10060325B2 (en) | 2014-10-10 | 2018-08-28 | Kubota Corporation | Cylinder head cooling apparatus of engine |
| US11008972B2 (en) * | 2016-09-20 | 2021-05-18 | Cummins Inc. | Systems and methods for avoiding structural failure resulting from hot high cycles using a cylinder head cooling arrangement |
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