JP3310735B2 - Cooling system for sub-chamber diesel engine - Google Patents
Cooling system for sub-chamber diesel engineInfo
- Publication number
- JP3310735B2 JP3310735B2 JP26040993A JP26040993A JP3310735B2 JP 3310735 B2 JP3310735 B2 JP 3310735B2 JP 26040993 A JP26040993 A JP 26040993A JP 26040993 A JP26040993 A JP 26040993A JP 3310735 B2 JP3310735 B2 JP 3310735B2
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- sub
- cooling
- diesel engine
- fuel
- 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 - Fee Related
Links
Classifications
-
- 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
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は副室式大型ディーゼル機
関の冷却装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a large diesel engine in a sub-chamber.
【０００２】[0002]
【従来の技術】中小型ディーゼル機関においては、シリ
ンダヘッド（シリンダカバー）に装着された副室本体内
に形成された副室内に主燃焼室から副室噴口を介して圧
縮空気を導入し、この圧縮空気中に燃料噴射弁から燃料
を噴射して着火燃焼せしめ、この燃焼ガスを副室噴口か
ら主燃焼室内に噴出せしめて主燃焼室内の燃焼を行う副
室式ディーゼル機関が採用されているものも少なくな
い。2. Description of the Related Art In a small and medium-sized diesel engine, compressed air is introduced from a main combustion chamber through a sub chamber injection port into a sub chamber formed in a sub chamber main body mounted on a cylinder head (cylinder cover). A sub-chamber diesel engine is used in which fuel is injected from a fuel injection valve into the compressed air to ignite and combust, and this combustion gas is injected into the main combustion chamber from a sub-chamber nozzle to burn the main combustion chamber. Not a few.
【０００３】この副室式ディーゼル機関はNOx(窒素酸化
物) の排出量が少なく、公害対策上有利ではあるが、通
常はシリンダヘッド冷却水のみによる冷却であるが、シ
リンダ径が概ね350mm 以上の大型機関では副室口金、副
室本体等に高い熱応力が発生するとともに、燃料噴射弁
の近傍を低温に維持するのが困難なため、かかる大型デ
ィーゼル機関においては副室式は殆ど採用されていなか
った。[0003] This sub-chamber diesel engine has a small amount of NOx (nitrogen oxide) emission and is advantageous in terms of pollution control. However, it is usually cooled only by the cylinder head cooling water, but the cylinder diameter is approximately 350 mm or more. In large engines, high thermal stress is generated in the sub-chamber base, the sub-chamber main body, etc., and it is difficult to maintain the temperature near the fuel injection valve at low temperature. Did not.
【０００４】[0004]
【発明が解決しようとする課題】シリンダ径350 〜900m
m 程度の大型２サイクルディーゼル機関を副室式にしよ
うとする場合、副室の容積（Ｖs)は２〜20リットルとい
う膨大な容積となる。(上死点時の主燃焼室の容積をＶc
mとすると、容積比η＝Ｖs/( Ｖs ＋Ｖcm）であり、容
積比ηを最低の0.2 としてもＶs は２〜20リットルとな
る。)[Problems to be solved by the invention] Cylinder diameter 350 to 900m
When a large two-stroke diesel engine having a size of about m is used as a sub-chamber type, the sub-chamber volume (Vs) becomes a huge volume of 2 to 20 liters. (The volume of the main combustion chamber at top dead center is Vc
Assuming m, the volume ratio η = Vs / (Vs + Vcm), and Vs is 2 to 20 liters even if the volume ratio η is set to the lowest 0.2. )
【０００５】このような大容積の副室を必要とする大型
ディーゼル機関においては、従来の中、小型ディーゼル
機関のように、副室をシリンダヘッド内に埋設してシリ
ンダヘッドから間接的に冷却する構造では、冷却が不充
分なため熱応力による副室構成部材の破損の発生が避け
られず、また、燃料噴射弁の近辺の温度を充分に低温に
するのが困難なため、メタノール等の低沸点燃料の使用
が不可能である。In a large-sized diesel engine requiring such a large-capacity sub-chamber, the sub-chamber is buried in a cylinder head and is indirectly cooled from the cylinder head as in a conventional small-sized diesel engine. In the structure, damage to the sub-chamber components due to thermal stress is unavoidable due to insufficient cooling, and it is difficult to sufficiently lower the temperature near the fuel injection valve. The use of boiling fuel is not possible.
【０００６】本発明は上記に鑑みなされたもので、副室
構成部材の熱応力を許容値以下に維持するとともに、燃
料噴射弁の近傍の温度を適度な低温に維持してメタノー
ル等の低沸点燃料を使用可能とした副室式大型ディーゼ
ル機関を提供することを目的とする。The present invention has been made in view of the above, and maintains the thermal stress of the sub-chamber constituent members below an allowable value, and maintains the temperature in the vicinity of the fuel injection valve at an appropriate low temperature to maintain a low boiling point such as methanol. It is an object of the present invention to provide a large-sized sub-chamber diesel engine capable of using fuel.
【０００７】[0007]
【課題を解決するための手段】本発明は上記課題を解決
するために発明されたものであって、その要旨とすると
ころは、下部副室の周壁を囲繞する第１冷却室と燃料噴
射弁及び上部副室の周壁を囲繞する第２冷却室とを互い
に遮断して設け、上記第１冷却室内にシリンダジャケッ
ト冷却用の冷却液を導入するとともに上記第２冷却室内
に上記第１冷却室に導入される冷却液よりも低温の冷却
液を導入したことにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its gist is to provide a first cooling chamber surrounding a peripheral wall of a lower sub chamber and a fuel injection valve. And a second cooling chamber surrounding the peripheral wall of the upper sub-chamber is provided so as to be shut off from each other, a cooling liquid for cooling the cylinder jacket is introduced into the first cooling chamber, and the first cooling chamber is introduced into the second cooling chamber. That is, a cooling liquid lower in temperature than the introduced cooling liquid is introduced.
【０００８】[0008]
【作用】シリンダジャケット冷却用の冷却水は第１冷却
室に流入し、副室噴口の近傍の副室下部を冷却する。The cooling water for cooling the cylinder jacket flows into the first cooling chamber, and cools the lower part of the sub-chamber near the sub-chamber injection port.
【０００９】一方、第１冷却室への冷却液よりも低温の
冷却液が第２冷却室内に導入されて副室上部及び燃料噴
射弁を冷却する。On the other hand, a coolant having a lower temperature than the coolant to the first cooling chamber is introduced into the second cooling chamber to cool the upper portion of the sub-chamber and the fuel injection valve.
【００１０】[0010]
【実施例】図１には本発明の１実施例が示され、 (A)は
副室式大型ディーゼル機関の副室の近傍の断面図、 (B)
は (A)のII−II線に沿う断面図である。FIG. 1 shows an embodiment of the present invention, in which (A) is a sectional view of the vicinity of a sub-chamber of a large-sized sub-chamber diesel engine, and (B).
FIG. 2 is a sectional view taken along line II-II of FIG.
【００１１】図において、２はシリンダヘッド、11はシ
リンダライナー、１は上記シリンダヘッド２の副室取付
孔2A内に嵌装された副室本体である。副室本体１内に
は、上部副室1M及び下部副室1Nからなる副室が形成さ
れ、下部副室1Nは副室噴口1Pを介して主燃焼室20と連通
している。In FIG. 1, reference numeral 2 denotes a cylinder head, 11 denotes a cylinder liner, and 1 denotes a sub-chamber main body fitted in the sub-chamber mounting hole 2A of the cylinder head 2. A sub-chamber including an upper sub-chamber 1M and a lower sub-chamber 1N is formed in the sub-chamber main body 1, and the lower sub-chamber 1N communicates with the main combustion chamber 20 via the sub-chamber injection port 1P.
【００１２】副室本体１の上部には副室ヘッド３及び燃
料弁ホルダ４が固着され、これら両部材３、４にまたが
って燃料噴射弁14が装着されている。この燃料噴射弁14
の噴口部14a は上部副室1Mに向けて燃料を噴射できるよ
うに設定されている。A sub-chamber head 3 and a fuel valve holder 4 are fixed to an upper portion of the sub-chamber main body 1, and a fuel injection valve 14 is mounted over both the members 3 and 4. This fuel injection valve 14
The nozzle port 14a is set so that fuel can be injected toward the upper sub chamber 1M.
【００１３】12は排気弁、13は排気弁座、10は排気弁12
と弁座13との間のシート部であり、排気弁座13の周囲に
は環状の排気弁冷却室18が形成されている。17は冷却室
金物である。15はシリンダヘッド２及びシリンダライナ
ー11の外周に設けられた冷却金物で、その内周にはシリ
ンダジャケット冷却液の出口通路16が形成されている。12 is an exhaust valve, 13 is an exhaust valve seat, 10 is an exhaust valve 12
An annular exhaust valve cooling chamber 18 is formed around the exhaust valve seat 13. 17 is a cooling room hardware. Reference numeral 15 denotes a cooling hardware provided on the outer periphery of the cylinder head 2 and the cylinder liner 11, and an outlet passage 16 for the cylinder jacket coolant is formed on the inner periphery thereof.
【００１４】22は副室本体１の下部副室1Nの周壁1Aを囲
繞して形成された第１の冷却室で、その入口側は冷却液
入口通路21を介して上記出口通路16に連通し、出口側は
冷却液出口通路27を介して排気弁冷却室18に連通してい
る。Reference numeral 22 denotes a first cooling chamber formed so as to surround the peripheral wall 1A of the lower sub-chamber 1N of the sub-chamber main body 1, and its inlet side communicates with the outlet passage 16 through a coolant inlet passage 21. The outlet side communicates with the exhaust valve cooling chamber 18 via a coolant outlet passage 27.
【００１５】副室本体１のほぼ中央部周壁を囲繞して下
部第２冷却室25が形成され、この下部第２冷却室25はシ
リンダヘッド２のフランジ部2Bに穿設された冷却液入口
通路26に連通している。23は副室ヘッド３内に燃料噴射
弁14を囲繞して形成された上部第２冷却室である。A lower second cooling chamber 25 is formed so as to surround a substantially central peripheral wall of the sub-chamber main body 1, and the lower second cooling chamber 25 is a coolant inlet passage formed in a flange portion 2B of the cylinder head 2. It communicates with 26. An upper second cooling chamber 23 is formed in the sub chamber head 3 so as to surround the fuel injection valve 14.
【００１６】下部第２冷却室25と上部第２冷却室23とは
副室ヘッド３に穿設された冷却孔28及び副室本体１内に
その長手方向に沿って円周方向等間隔を隔てて穿設され
た複数個（この実施例の場合は、図(B) に示すように８
個）の冷却孔24を介して連通している。30は上部第２冷
却室23に連通する冷却液出口通路である。The lower second cooling chamber 25 and the upper second cooling chamber 23 are equally spaced circumferentially along the longitudinal direction in the cooling hole 28 formed in the sub-chamber head 3 and the sub-chamber main body 1. (In the case of this embodiment, as shown in FIG.
) Cooling holes 24. Reference numeral 30 denotes a coolant outlet passage communicating with the upper second cooling chamber 23.
【００１７】下部第２冷却室25及び冷却孔24、28及び上
部第２冷却室23から第２冷却室が構成され、この第２冷
却室と第１冷却室22とはシールシリング32により完全に
遮断されている。A second cooling chamber is constituted by the lower second cooling chamber 25, the cooling holes 24 and 28, and the upper second cooling chamber 23, and the second cooling chamber and the first cooling chamber 22 are completely connected by the seal sealing 32. Is blocked.
【００１８】上記のように構成された副室式大型ディー
ゼル機関の運転時において、シリンダライナ11を冷却す
ることによってほぼ80℃に昇温したシリンダジャケット
冷却液は冷却液出口通路16から冷却液入口通路21を経て
第１冷却室22に流入する。この冷却液は第１冷却室22内
において下部副室1Nを冷却することにより７〜８deg℃
昇温せしめられた後、冷却液出口通路27を通って排気弁
冷却室18に送られる。ここで排気弁12と排気弁座13との
シート部10を間接的に冷却した後図示しない流路を経て
ジャケット冷却液タンクに戻される。During operation of the sub-chamber type large-sized diesel engine constructed as described above, the cylinder jacket coolant, which has been heated to approximately 80 ° C. by cooling the cylinder liner 11, flows through the coolant outlet passage 16 through the coolant inlet port. It flows into the first cooling chamber 22 through the passage 21. This cooling liquid cools the lower sub-chamber 1N in the first cooling chamber 22 so as to be 7 to 8 ° C.
After the temperature is raised, it is sent to the exhaust valve cooling chamber 18 through the coolant outlet passage 27. Here, the seat portion 10 between the exhaust valve 12 and the exhaust valve seat 13 is indirectly cooled and then returned to the jacket coolant tank via a flow path (not shown).
【００１９】一方、下部第２冷却室25には冷却液ポンプ
( 図示せず) から送給された40℃程度の低温の冷却液が
冷却液入口通路26を経て導入される。この冷却液は環状
の下部第２冷却室25内を円周方向に回流して副室本体１
の中央部を冷却した後、複数個の冷却孔24内を流過する
過程で副室本体１の上部を冷却した後、冷却孔28を通っ
て上部第２冷却室23に入る。On the other hand, the lower second cooling chamber 25 has a coolant pump.
A low-temperature coolant supplied at about 40 ° C. (not shown) is introduced through a coolant inlet passage 26. This coolant circulates in the annular lower second cooling chamber 25 in the circumferential direction, and flows into the sub-chamber main body 1.
After cooling the central part of the sub-chamber, the upper part of the sub-chamber main body 1 is cooled in the process of flowing through the plurality of cooling holes 24 and then enters the upper second cooling chamber 23 through the cooling holes 28.
【００２０】この冷却液は燃料噴射弁14を冷却すること
により45℃〜46℃程度に昇温した後、冷却液出口通路30
から系外へ排出される。これにより副室本体１の中央部
及び上部の内壁はほぼ200 ℃〜220 ℃に保持しうる。ま
た、燃料噴射弁14はその温度を55℃以下に保持すること
ができるので、メタノール燃料等の低沸点燃料が使用可
能となる。The coolant is heated to about 45 ° C. to 46 ° C. by cooling the fuel injection valve 14 and then cooled to a coolant outlet passage 30.
From the system. As a result, the central and upper inner walls of the sub-chamber main body 1 can be maintained at approximately 200 ° C. to 220 ° C. Further, since the temperature of the fuel injection valve 14 can be maintained at 55 ° C. or lower, a low-boiling-point fuel such as methanol fuel can be used.
【００２１】[0021]
【発明の効果】本発明によれば、第１冷却室と第２冷却
室とを互いに遮断して設け、第１冷却室にシリンダジャ
ケット冷却用の冷却液を、第２冷却室に第１冷却室に導
入される冷却液よりも低温の冷却液を供給して上部副室
及び燃料噴射弁14を冷却するので、副室を適正温度に維
持でき、従って、高温、高負荷の大型ディーゼル機関用
副室として充分な耐久性を得ることができる。According to the present invention, the first cooling chamber and the second cooling chamber are provided so as to be isolated from each other, the first cooling chamber is provided with a cooling liquid for cooling the cylinder jacket, and the second cooling chamber is provided with the first cooling chamber. Since the upper sub-chamber and the fuel injection valve 14 are cooled by supplying a cooling liquid lower in temperature than the cooling liquid introduced into the chamber, the sub-chamber can be maintained at an appropriate temperature. Sufficient durability can be obtained as a sub chamber.
【００２２】更に、燃料噴射弁は低温の冷却液で冷却さ
れ、概ね55℃以下の温度に維持できるので、メタノール
等の低沸点燃料が使用可能な副室式大型ディーゼル機関
を提供することができる。Further, since the fuel injection valve is cooled by a low-temperature coolant and can be maintained at a temperature of about 55 ° C. or less, a large-chamber large diesel engine capable of using a low-boiling fuel such as methanol can be provided. .
【図１】本発明の１実施例を示し、 (A)は副室式大型デ
ィーゼル機関の副室の近傍を示す断面図、 (B)は (A)の
II−II線に沿う断面図である。1A and 1B show an embodiment of the present invention, in which FIG. 1A is a cross-sectional view showing the vicinity of a sub-chamber of a large-sized sub-chamber diesel engine, and FIG.
It is sectional drawing which follows the II-II line.
１ 副室本体 1M 上部副室 1N 下部副室 1P 副室噴口 ２ シリンダヘッド 11 シリンダライナー 14 燃料噴射弁 20 主燃焼室 22 第１冷却室 23 上部第２冷却室 24 冷却孔 25 下部第２冷却室 DESCRIPTION OF SYMBOLS 1 Sub chamber main body 1M Upper sub chamber 1N Lower sub chamber 1P Sub chamber injection port 2 Cylinder head 11 Cylinder liner 14 Fuel injection valve 20 Main combustion chamber 22 First cooling chamber 23 Upper second cooling chamber 24 Cooling hole 25 Lower second cooling chamber
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F02F 1/36 F01P 3/02 F02B 19/14 Continuation of front page (58) Field surveyed (Int.Cl. 7 , DB name) F02F 1/36 F01P 3/02 F02B 19/14
Claims (1)
副室内に上記副室噴口を経て導入された圧縮空気に燃料
噴射弁から燃料を噴射して着火せしめることにより発生
した燃焼ガスを上記副室噴口から上記主燃焼室内に噴出
する副室式ディーゼル機関において、上記副室噴口の近
傍の下部副室の周壁を囲繞して形成され、シリンダジャ
ケット冷却用の冷却液が導入される第１冷却室と、上記
燃料噴射弁及びその近傍の上部副室の周壁を囲繞して上
記第１冷却室とは遮断されて形成され、上記第１冷却室
に導入される冷却液よりも低温の冷却液が導入される第
２冷却室とを備えていることを特徴とする副室式ディー
ゼル機関の冷却装置。A combustion gas generated by injecting fuel from a fuel injection valve into a compressed air introduced through a sub-chamber injection port into a sub-chamber communicated with the main combustion chamber via a sub-chamber injection port and igniting the compressed air. In the sub-chamber diesel engine that injects the fuel into the main combustion chamber from the sub-chamber injection port, the cooling liquid for cooling the cylinder jacket is formed by surrounding the peripheral wall of the lower sub-chamber near the sub-chamber injection port. a first cooling chamber, surrounds the peripheral wall of the fuel injection valve and the vicinity of the upper sub-chamber that is formed is cut off from the first cooling chamber, the first cooling chamber
And a second cooling chamber into which a cooling liquid lower in temperature than the cooling liquid introduced into the second cooling chamber is introduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26040993A JP3310735B2 (en) | 1993-09-27 | 1993-09-27 | Cooling system for sub-chamber diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26040993A JP3310735B2 (en) | 1993-09-27 | 1993-09-27 | Cooling system for sub-chamber diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0791314A JPH0791314A (en) | 1995-04-04 |
| JP3310735B2 true JP3310735B2 (en) | 2002-08-05 |
Family
ID=17347529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26040993A Expired - Fee Related JP3310735B2 (en) | 1993-09-27 | 1993-09-27 | Cooling system for sub-chamber diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3310735B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013217335A (en) * | 2012-04-11 | 2013-10-24 | Mitsubishi Heavy Ind Ltd | 2-cycle gas engine |
| GB2545417A (en) * | 2015-12-14 | 2017-06-21 | Caterpillar Energy Solutions Gmbh | Prechamber assembly for internal combustion engine |
| EP3521585A1 (en) * | 2018-02-01 | 2019-08-07 | Innio Jenbacher GmbH & Co OG | Prechamber device for combustion engine |
| DK181032B1 (en) * | 2020-06-17 | 2022-10-07 | Man Energy Solutions Filial Af Man Energy Solutions Se Tyskland | Internal combustion engine |
-
1993
- 1993-09-27 JP JP26040993A patent/JP3310735B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0791314A (en) | 1995-04-04 |
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