JP2000170599A - Cooling structure for head overheat part of monoblock engine - Google Patents
Cooling structure for head overheat part of monoblock engineInfo
- Publication number
- JP2000170599A JP2000170599A JP10346838A JP34683898A JP2000170599A JP 2000170599 A JP2000170599 A JP 2000170599A JP 10346838 A JP10346838 A JP 10346838A JP 34683898 A JP34683898 A JP 34683898A JP 2000170599 A JP2000170599 A JP 2000170599A
- Authority
- JP
- Japan
- Prior art keywords
- water chamber
- head
- chamber
- water
- cylinder
- 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
- 238000001816 cooling Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000000498 cooling water Substances 0.000 claims abstract description 45
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000010992 reflux Methods 0.000 claims description 14
- 239000000446 fuel Substances 0.000 claims description 13
- 238000013021 overheating Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 abstract 1
- 238000005192 partition Methods 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
Landscapes
- 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、シリンダヘッド部
とシリンダブロック部を一体に形成し、各気筒が燃料噴
射弁と、連通したヘッド側冷却水室、ライナ側冷却水室
とを有する形式のモノブロックエンジンのヘッド過熱部
冷却構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which a cylinder head portion and a cylinder block portion are integrally formed, and each cylinder has a fuel injection valve, a head-side cooling water chamber and a liner-side cooling water chamber communicating with each other. The present invention relates to a head overheating portion cooling structure of a monoblock engine.
【０００２】[0002]
【従来の技術】従来、シリンダヘッド部とシリンダブロ
ック部を一体に形成し、各気筒が燃料噴射弁と、連通し
たヘッド側冷却水室、ライナ側冷却水室とを有する形式
のモノブロックエンジンは知られている。そのエンジン
では、冷却水ポンプの吐出口はライナ側冷却水室の下部
に連通し、燃焼室を囲むシリンダブロック部を冷却した
後の冷却水がヘッド側冷却水室へ供給され、シリンダヘ
ッド部を冷却した後に排気マニホールド内の冷却水室等
とラジエータを経て再び冷却水ポンプの吸込み口に戻さ
れるのが一般的である。ところがその場合はヘッド側冷
却水室へ入る冷却水の温度がかなり上昇しており、しか
も噴射弁ガイド部と排気弁ガイド部からなる過熱部に積
極的に供給されない構造である為、過熱部に亀裂や変形
が生じたり、燃料噴射弁の性能が低下する等の不具合が
避けられなかった。2. Description of the Related Art Conventionally, a monoblock engine of a type in which a cylinder head portion and a cylinder block portion are integrally formed and each cylinder has a fuel injection valve, a head-side cooling water chamber and a liner-side cooling water chamber communicating with each other is known. Are known. In that engine, the discharge port of the cooling water pump communicates with the lower part of the liner-side cooling water chamber, and cooling water after cooling the cylinder block surrounding the combustion chamber is supplied to the head-side cooling water chamber, and the cylinder head is cooled. After cooling, the cooling water is generally returned to the suction port of the cooling water pump through a cooling water chamber and the like in the exhaust manifold and a radiator. However, in this case, the temperature of the cooling water entering the cooling water chamber on the head side has risen considerably, and the structure is not actively supplied to the superheated portion consisting of the injection valve guide and the exhaust valve guide. Failures such as cracking and deformation and deterioration of the performance of the fuel injection valve were inevitable.
【０００３】[0003]
【発明が解決しようとする課題】モノブロックエンジン
のヘッド過熱部を有効に冷却し得る構造を提供する。SUMMARY OF THE INVENTION An object of the present invention is to provide a structure capable of effectively cooling a head heating portion of a monobloc engine.
【０００４】[0004]
【課題を解決するための手段】請求項１の発明は、シリ
ンダヘッド部とシリンダブロック部を一体に形成し、各
気筒が燃料噴射弁と、連通したヘッド側冷却水室、ライ
ナ側冷却水室とを有する形式のモノブロックエンジンに
おいて、両水室を一方の導入水室と他方の還流水室とに
隔絶し、シリンダヘッド部の排気弁ガイド部近傍に穿設
された排気弁部水路を介して導入水室と還流水室とを連
通させたことを特徴とするモノブロックエンジンのヘッ
ド過熱部冷却構造である。According to a first aspect of the present invention, a cylinder head portion and a cylinder block portion are integrally formed, and each cylinder communicates with a fuel injection valve in a head side cooling water chamber and a liner side cooling water chamber. In the monoblock engine of the type having the following, the two water chambers are separated into one introduction water chamber and the other return water chamber, and the two water chambers are separated through an exhaust valve section water passage formed in the vicinity of the exhaust valve guide section of the cylinder head. A head overheating portion cooling structure of a monobloc engine, characterized in that the introduction water chamber and the reflux water chamber are communicated with each other.
【０００５】請求項２の発明は、シリンダヘッド部とシ
リンダブロック部を一体に形成し、各気筒が燃料噴射弁
と、連通したヘッド側冷却水室、ライナ側冷却水室とを
有する形式のモノブロックエンジンにおいて、両水室を
一方の導入水室と他方の還流水室とに隔絶し、シリンダ
ヘッド部のノズルスリーブ外周に設けたノズル水室を介
して導入水室と還流水室とを連通させたことを特徴とす
るモノブロックエンジンのヘッド過熱部冷却構造であ
る。According to a second aspect of the invention, a cylinder head and a cylinder block are integrally formed, and each cylinder has a fuel injection valve, and a head-side cooling water chamber and a liner-side cooling water chamber which communicate with each other. In a block engine, both water chambers are separated into one introduction water chamber and the other reflux water chamber, and the introduction water chamber and the reflux water chamber are communicated via a nozzle water chamber provided around the nozzle sleeve of the cylinder head. This is a head superheated part cooling structure of a monoblock engine characterized by being made to work.
【０００６】請求項３の発明は、シリンダヘッド部とシ
リンダブロック部を一体に形成し、各気筒が燃料噴射弁
と、連通したヘッド側冷却水室、ライナ側冷却水室とを
有する形式のモノブロックエンジンにおいて、両水室を
一方の導入水室と他方の還流水室とに隔絶し、シリンダ
ヘッド部の排気弁ガイド部近傍に穿設された排気弁部水
路とシリンダヘッド部のノズルスリーブ外周に設けたノ
ズル水室を介して導入水室と還流水室とを連通させたこ
とを特徴とするモノブロックエンジンのヘッド過熱部冷
却構造である。According to a third aspect of the present invention, a cylinder head portion and a cylinder block portion are integrally formed, and each cylinder has a fuel injection valve, and a head-side cooling water chamber and a liner-side cooling water chamber communicating with each other. In a block engine, both water chambers are separated into one introduction water chamber and the other reflux water chamber, and an exhaust valve section water passage formed near the exhaust valve guide section of the cylinder head section and the outer periphery of the nozzle sleeve of the cylinder head section. A head overheating portion cooling structure of a monobloc engine, characterized in that an introduction water chamber and a reflux water chamber are communicated via a nozzle water chamber provided in a monoblock engine.
【０００７】[0007]
【発明の実施の形態】図１は、請求項１の発明によるモ
ノブロックエンジン１の第１気筒（Ｎｏ．１Ｃｙｌ．）
の要部縦断正面図で、エンジンブロック２（FC又はAｌ
の鋳物）はシリンダヘッド部３とシリンダブロック部４
を一体に備え且つ燃料噴射弁５（取付け部のみ図示）
と、連通したヘッド側冷却水室６、ライナ側冷却水室７
と、導入水路８を有する隔壁９と、導入水路８を外部か
ら明ける為の錐孔を塞ぐ盲プラグ１０と、燃焼室１１
（この室の円筒状内面はそれ自体がライナを形成する場
合の外に別のライナが圧入されるか鋳込まれる）と、燃
焼室１１内から熱負荷を受ける噴射弁ガイド部１２と、
隔壁９及び後述する隔壁１３（図２）により図１の右側
と左側に区画される導入水室１４（水室６、７の右半
分）及び還流水室１５（水室６、７の左半分）と、図示
されていない冷却水ポンプの吐出口に連通した冷却水導
入口１６と、気筒間のシリンダブロック部４の肉厚内に
設けられて導入水室１４と還流水室１５をつなぐライナ
側連通水路１７（導入水路８より小径）と、排気通路１
８及び給気通路１９を有する筒状部とを備えている。FIG. 1 shows a first cylinder (No. 1 Cyl.) Of a monoblock engine 1 according to the first aspect of the present invention.
Is a vertical sectional front view of an engine block 2 (FC or Al).
Is a cylinder head 3 and a cylinder block 4
And the fuel injection valve 5 (only the mounting portion is shown)
And the head side cooling water chamber 6 and the liner side cooling water chamber 7
A partition 9 having an inlet channel 8, a blind plug 10 for closing a conical hole for opening the inlet channel 8 from the outside, and a combustion chamber 11
(Another liner is press-fitted or cast into the cylindrical inner surface of this chamber in addition to the case where the liner itself forms a liner).
The inlet water chamber 14 (the right half of the water chambers 6 and 7) and the return water chamber 15 (the left half of the water chambers 6 and 7) partitioned into the right and left sides of FIG. ), A cooling water introduction port 16 communicating with a discharge port of a cooling water pump (not shown), and a liner provided within the thickness of the cylinder block 4 between the cylinders and connecting the introduction water chamber 14 and the reflux water chamber 15. The side communication water passage 17 (smaller than the introduction water passage 8) and the exhaust passage 1
8 and a cylindrical portion having an air supply passage 19.
【０００８】図１のＩＩ−ＩＩ断面略図である図２のよ
うに、この実施例では各気筒が夫々２個の排気弁２１と
吸気弁２２を備え、筒状の排気弁ガイド部２３、２３は
隔壁２４（弁間部）で一体化されており、噴射弁ガイド
部１２とノズルスリーブ２５の間の環状断面のノズル水
室２０の下端部は導入水路８に連通し且つ弁間水路２
８、２９と同水路中の連通部３３を介して還流水路１５
に連通している。図２の噴射弁ガイド部１２、排気弁ガ
イド部２３、２３、隔壁２４は熱負荷の高い過熱部であ
る。As shown in FIG. 2 which is a schematic sectional view taken along the line II-II of FIG. 1, in this embodiment, each cylinder is provided with two exhaust valves 21 and two intake valves 22, and cylindrical exhaust valve guides 23, 23 are provided. Are integrated by a partition wall 24 (an inter-valve portion), and the lower end of the nozzle water chamber 20 having an annular cross section between the injection valve guide portion 12 and the nozzle sleeve 25 communicates with the introduction water passage 8 and the inter-valve water passage 2
8 and 29 and the return channel 15 through the communication portion 33 in the channel.
Is in communication with The injection valve guide section 12, the exhaust valve guide sections 23, 23, and the partition wall 24 in FIG. 2 are superheated sections having a high heat load.
【０００９】エンジンの運転中に冷却水導入口１６から
シリンダヘッド部３の導入水室１４内へ供給された冷た
い冷却水の大部分（例えば７０〜８０％）が気筒毎に大
径の導入水路８から矢印Ａのようにノズル水室２０へ向
かい流れノズルスリーブ２５に衝突して両側へ分かれ、
弁間水路２８、２９を経て連通部３３から還流水室１５
へ流れ、その間にノズル水室２０に面したノズルスリー
ブ２５、噴射弁ガイド部１２、排気弁ガイド部２３、２
３、隔壁２４（弁間部）等の過熱部を有効に冷却し、還
流水室１５を矢印Ｂ方向に流れ、出口２６から例えば排
気マニホールドの水室へ供給される。同時に、導入水室
１４内の残りの冷たい冷却水は細いライナ側連通水路１
７（図１・・水平でなくとも良い）を通り還流水室１５
に入り、その間に燃焼室１１の上端に近い気筒間のシリ
ンダブロック部４を有効に冷却する。ライナ側連通水路
１７より低い燃焼室１１に面したライナ部分はライナ側
冷却水室７内にほぼ滞留する冷却水により緩やかに冷却
され、好ましい温度に保持される。出口２６は排気マニ
ホールド内の水室、ラジエータ（共に図示せず）を介し
て冷却水ポンプの吸込み口へ接続する。During the operation of the engine, most (for example, 70 to 80%) of the cold cooling water supplied from the cooling water inlet 16 into the inlet water chamber 14 of the cylinder head portion 3 has a large diameter inlet water channel for each cylinder. 8 flows toward the nozzle water chamber 20 as shown by the arrow A, collides with the nozzle sleeve 25, and splits on both sides.
Through the inter-valve water passages 28 and 29, the return water chamber 15
To the nozzle sleeve 25 facing the nozzle water chamber 20, the injection valve guide section 12, the exhaust valve guide section 23,
3. The superheated portion such as the partition wall 24 (between the valves) is effectively cooled, flows through the reflux water chamber 15 in the direction of arrow B, and is supplied from the outlet 26 to, for example, a water chamber of an exhaust manifold. At the same time, the remaining cold cooling water in the introduction water chamber 14 is supplied to the thin liner-side communication channel 1.
Reflux water chamber 15 through 7 (Fig. 1 ... not necessarily horizontal)
During this time, the cylinder block 4 between the cylinders near the upper end of the combustion chamber 11 is effectively cooled. The liner portion facing the combustion chamber 11 lower than the liner-side communication water passage 17 is gradually cooled by cooling water substantially staying in the liner-side cooling water chamber 7 and is maintained at a preferable temperature. The outlet 26 is connected to a suction port of a cooling water pump via a water chamber and a radiator (both not shown) in the exhaust manifold.
【００１０】図２のように、２個の排気弁２１を有する
エンジンに請求項１を採用すると、過熱部に面し且つ過
熱部を形成する隔壁２４内の弁間水路２８（排気弁ガイ
ド部２３に近い過熱部を貫く水路）を形成することがで
き、過熱部に対する冷却効果が増大する。しかも隔壁１
３により導入水室１４と還流水室１５を隔絶した状態で
導入水路８からまず大部分の冷却水をノズル水室２０に
受け入れるので、過熱部周辺の冷却効果が向上する。又
導入水室１４と還流水室１５を区画する為の隔壁１３に
より剛性が増し、熱による変形を可及的に少なく保ち且
つ燃料噴射弁５の性能低下を防止する。更に、冷却水導
入口１６を導入水路８と同一水平面内又はその近傍のヘ
ッド側冷却水室６側に配置すると、導入水路８をライナ
側連通水路１７より大径にしたことと相俟って、過熱部
ばかりでなく導入水室１４内の排気通路１８の筒状部の
冷却も有効に行える利点が生ずる。本発明は単気筒デイ
ーゼルエンジンにも同様に適用することができ、弁間水
路２８の代わりに排気弁ガイド部２３の排気通路１８側
肉厚内に排気弁部水路を形成することもできる。As shown in FIG. 2, when the first aspect is applied to an engine having two exhaust valves 21, an inter-valve water passage 28 (exhaust valve guide portion) in the partition wall 24 facing the superheated portion and forming the superheated portion. 23 can be formed, and the cooling effect on the superheated portion is increased. Moreover, partition 1
Since most of the cooling water is first received from the introduction water channel 8 into the nozzle water chamber 20 in a state where the introduction water chamber 14 and the reflux water chamber 15 are isolated by 3, the cooling effect around the superheated portion is improved. In addition, the rigidity is increased by the partition wall 13 for partitioning the introduction water chamber 14 and the reflux water chamber 15, the deformation due to heat is kept as small as possible, and the performance of the fuel injection valve 5 is prevented from deteriorating. Further, when the cooling water inlet 16 is disposed on the head-side cooling water chamber 6 in the same horizontal plane as the inlet water passage 8 or in the vicinity thereof, the inlet water passage 8 is made larger in diameter than the liner-side communication water passage 17. This has the advantage that not only the superheated portion but also the cylindrical portion of the exhaust passage 18 in the introduction water chamber 14 can be effectively cooled. The present invention can be similarly applied to a single-cylinder diesel engine. Instead of the inter-valve water passage 28, an exhaust valve water passage can be formed in the exhaust valve guide portion 23 in the thickness on the exhaust passage 18 side.
【００１１】[0011]
【発明の効果】請求項１の発明によると、ヘッド側の過
熱部（特に弁間部）に集中的に冷却水を流して、冷却効
果を高めることができ、亀裂の発生を抑えることができ
る。又隔壁１３によりヘッド部の剛性向上効果が得られ
る。ライナ側下部の過冷却を防止出来る効果もある。請
求項２の発明によると、請求項１の発明による上記効果
の他に、ノズル（燃料噴射弁５）外周の冷却が良くな
る。請求項３の発明によると、請求項１の発明による上
記効果の他に、ノズル外周と弁間部等の排気弁部（過熱
部）の冷却性能が向上する。According to the first aspect of the present invention, the cooling water can be intensively supplied to the superheated portion (particularly, the inter-valve portion) on the head side, so that the cooling effect can be enhanced and the generation of cracks can be suppressed. . Further, the effect of improving the rigidity of the head portion is obtained by the partition wall 13. It also has the effect of preventing overcooling of the lower part on the liner side. According to the invention of claim 2, in addition to the effect of the invention of claim 1, cooling of the outer periphery of the nozzle (fuel injection valve 5) is improved. According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the cooling performance of the exhaust valve portion (superheated portion) such as the nozzle outer periphery and the inter-valve portion is improved.
【図１】 請求項１の発明によるモノブロックエンジン
の要部縦断正面図である。FIG. 1 is a longitudinal sectional front view of a main part of a monobloc engine according to the invention of claim 1;
【図２】 図１のＩＩ−ＩＩ断面略図である。FIG. 2 is a schematic sectional view taken along the line II-II of FIG.
３ シリンダヘッド部 ４ シリンダブロック部 ５ 燃料噴射弁 ６ ヘッド側冷却水室 ７ ライナ側冷却水室 １２ 噴射弁ガイド部 １３ 隔壁 １４ 導入水室 １５ 還流水室 １７ ライナ側連通水路 ２０ ノズル水室 ２１ 排気弁 ２３ 排気弁ガイド部 ２５ ノズルスリーブ ２８ 弁間水路（排気弁部水路） Reference Signs List 3 Cylinder head part 4 Cylinder block part 5 Fuel injection valve 6 Head side cooling water chamber 7 Liner side cooling water chamber 12 Injection valve guide part 13 Partition wall 14 Introducing water chamber 15 Reflux water chamber 17 Liner side communication water path 20 Nozzle water chamber 21 Exhaust Valve 23 Exhaust valve guide part 25 Nozzle sleeve 28 Inter-valve water path (Exhaust valve part water path)
Claims (3)
を一体に形成し、各気筒が燃料噴射弁と、連通したヘッ
ド側冷却水室、ライナ側冷却水室とを有する形式のモノ
ブロックエンジンにおいて、両水室を一方の導入水室と
他方の還流水室とに隔絶し、シリンダヘッド部の排気弁
ガイド部近傍に穿設された排気弁部水路を介して導入水
室と還流水室とを連通させたことを特徴とするモノブロ
ックエンジンのヘッド過熱部冷却構造。In a monoblock engine of a type in which a cylinder head portion and a cylinder block portion are integrally formed, each cylinder has a fuel injection valve, a head-side cooling water chamber and a liner-side cooling water chamber communicating with each other. The water chamber is separated into one introduction water chamber and the other reflux water chamber, and the introduction water chamber and the reflux water chamber are communicated via an exhaust valve water passage formed near the exhaust valve guide section of the cylinder head. The cooling structure of the head superheated section of the monobloc engine.
を一体に形成し、各気筒が燃料噴射弁と、連通したヘッ
ド側冷却水室、ライナ側冷却水室とを有する形式のモノ
ブロックエンジンにおいて、両水室を一方の導入水室と
他方の還流水室とに隔絶し、シリンダヘッド部のノズル
スリーブ外周に設けたノズル水室を介して導入水室と還
流水室とを連通させたことを特徴とするモノブロックエ
ンジンのヘッド過熱部冷却構造。2. A monoblock engine of a type in which a cylinder head portion and a cylinder block portion are integrally formed and each cylinder has a fuel injection valve, a head side cooling water chamber and a liner side cooling water chamber communicating with each other. The water chamber is separated into one introduction water chamber and the other return water chamber, and the introduction water chamber and the return water chamber are communicated via a nozzle water chamber provided on the outer periphery of the nozzle sleeve of the cylinder head. The cooling structure of the head overheating part of the monoblock engine.
を一体に形成し、各気筒が燃料噴射弁と、連通したヘッ
ド側冷却水室、ライナ側冷却水室とを有する形式のモノ
ブロックエンジンにおいて、両水室を一方の導入水室と
他方の還流水室とに隔絶し、シリンダヘッド部の排気弁
ガイド部近傍に穿設された排気弁部水路とシリンダヘッ
ド部のノズルスリーブ外周に設けたノズル水室を介して
導入水室と還流水室とを連通させたことを特徴とするモ
ノブロックエンジンのヘッド過熱部冷却構造。3. A monoblock engine of a type in which a cylinder head portion and a cylinder block portion are integrally formed and each cylinder has a fuel injection valve, a head-side cooling water chamber and a liner-side cooling water chamber communicating with each other. The water chamber is separated into one introduction water chamber and the other reflux water chamber, and an exhaust valve water passage formed in the vicinity of the exhaust valve guide of the cylinder head and a nozzle water provided around the nozzle sleeve of the cylinder head. A head overheating portion cooling structure for a monobloc engine, wherein an introduction water chamber and a return water chamber are communicated through a chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10346838A JP2000170599A (en) | 1998-12-07 | 1998-12-07 | Cooling structure for head overheat part of monoblock engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10346838A JP2000170599A (en) | 1998-12-07 | 1998-12-07 | Cooling structure for head overheat part of monoblock engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000170599A true JP2000170599A (en) | 2000-06-20 |
Family
ID=18386159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10346838A Pending JP2000170599A (en) | 1998-12-07 | 1998-12-07 | Cooling structure for head overheat part of monoblock engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000170599A (en) |
-
1998
- 1998-12-07 JP JP10346838A patent/JP2000170599A/en active Pending
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