JPS608429A - Water-cooled multi-cylinder internal-combustion engine - Google Patents
Water-cooled multi-cylinder internal-combustion engineInfo
- Publication number
- JPS608429A JPS608429A JP11793583A JP11793583A JPS608429A JP S608429 A JPS608429 A JP S608429A JP 11793583 A JP11793583 A JP 11793583A JP 11793583 A JP11793583 A JP 11793583A JP S608429 A JPS608429 A JP S608429A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- cooling water
- compression ratio
- flame propagation
- cooling
- 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、複数の気筒を列状に配設した水冷式判型多気
筒内燃機関に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-cooled multi-cylinder internal combustion engine in which a plurality of cylinders are arranged in a row.
一般にこの種の水冷式判型多気筒内燃機関では、ラジェ
ータからの冷却水を、シリンダブロック内に各気筒の外
周を互に連通ずるように形成した冷却水ジャケットに、
気筒列の列方向の一側面における冷却水入口から冷却水
ポンプにて供給する一方、シリンダヘッドに各気筒の燃
焼室の上部外側を互に連通ずるように形成した冷却水室
内に、前記シリンダブロックの冷却水ジャケット内の冷
却水を、各気筒個所から導入したのち、ラジェータ側に
流出するようにしていることが知られている。Generally, in this type of water-cooled multi-cylinder internal combustion engine, cooling water from the radiator is passed through a cooling water jacket formed in the cylinder block so that the outer periphery of each cylinder communicates with each other.
A cooling water pump supplies cooling water from a cooling water inlet on one side in the row direction of the cylinder row, and the cylinder block is provided in a cooling water chamber formed in the cylinder head so as to communicate with each other at the upper outer side of the combustion chamber of each cylinder. It is known that the cooling water in the cooling water jacket of the engine is introduced from each cylinder and then flows out to the radiator side.
しかし、このような冷却水の流れ形態であると、どうし
てもシリンダブロックにおける冷却水ジャケットへの冷
却水入口に近い部位の気筒と、遠い部位の気筒とでは冷
却に差が生じ、従って、各気筒の温度は、冷却水入口に
近い気筒が低く、遠い気筒が高くなって、各気筒での火
炎伝播に差ができて、燃焼の形態が各気筒について同じ
にならないから、機関全体として出力低下及び騒音が増
大することに加えて、排気ガスの悪化を招来することに
なる。However, with this type of cooling water flow, there will inevitably be a difference in cooling between the cylinders in the cylinder block near the cooling water inlet to the cooling water jacket and the cylinders in the farthest part. The temperature is lower in the cylinders closer to the cooling water inlet and higher in the cylinders farther from the cooling water inlet, creating differences in flame propagation in each cylinder and the combustion pattern not being the same for each cylinder, resulting in a decrease in engine output and noise as a whole. In addition to an increase in the amount of fuel, this also results in deterioration of exhaust gas.
そこで、先行技術文献としての実開昭４９−１３５５４
１号公報及びその全文明細書は、シリンダブロックにお
ける冷却水ジャケット内の冷却水が、シリンダブロック
の冷却水室に各気筒個所から流入するときの通孔を、冷
却水入口から遠ざかるにつれて大きく形成することを提
案しているが、冷却水ジャケット内の冷却水の流れ、及
び燃焼室から冷却水への熱伝達は、きわめて複雑な形態
をとることに加えて、シリンダヘッドにおける冷却水室
内の冷却水は、気筒列方向の一側面から流出するもので
あり、しかも、冷却水の流れは自動車の車速及び冷却水
量によって大きく変動するから、通孔の変更のみによっ
て各気筒に対する冷却を一様にすることは、殆ど不可能
に近いのである本発明は、水冷式の副型多気筒内燃機関
では前記のように各気筒に対する冷却を同じにすること
が不可能に近かく、各気筒には温度むらを生じるが、各
気筒の燃焼室における火炎伝播は、燃焼室の温度ばかり
でなく圧縮比にも関連し、圧縮比を高めると火炎伝播が
促進されることに着目し、水冷によって温度が低くなる
気筒では圧縮比を高く、温度が高くなる気筒では圧縮比
を低くするように設定することにより、各気筒での燃焼
状態を略同じにしたものである。Therefore, Utility Model Application Publication No. 49-13554 as a prior art document
Publication No. 1 and its full specification state that the holes through which the cooling water in the cooling water jacket of the cylinder block flows into the cooling water chamber of the cylinder block from each cylinder are formed to become larger as the distance from the cooling water inlet increases. However, the flow of cooling water in the cooling water jacket and the heat transfer from the combustion chamber to the cooling water are extremely complex, and the flow of cooling water in the cooling water chamber in the cylinder head is extremely complex. The cooling water flows out from one side in the direction of the cylinder row, and since the flow of cooling water varies greatly depending on the vehicle speed and the amount of cooling water, it is possible to uniformly cool each cylinder by simply changing the vents. In the present invention, in a water-cooled sub-type multi-cylinder internal combustion engine, it is almost impossible to equalize the cooling to each cylinder as described above, However, flame propagation in the combustion chamber of each cylinder is related not only to the temperature of the combustion chamber but also to the compression ratio. In this case, the compression ratio is set to be high, and the compression ratio is set to be low in cylinders where the temperature becomes high, thereby making the combustion state in each cylinder substantially the same.
以下本発明を、実施例の図面について説明すると、図に
おいて１は第一気筒Ａ１、第二気筒Ａ２、第三気筒Ａ３
を列状に備えたシリンダブロック、２は該シリンダブロ
ック１の上面にガスケット３を挟んで締結され、前記各
気筒に各々燃焼室４．５．６を形成するためのシリンダ
ヘッドを示し、該シリンダヘッド２には前記各気筒の個
所に吸気ポート７．８．９と排気ポート１０，１１．１
２を備えている。The present invention will be described below with reference to drawings of embodiments. In the drawings, 1 is a first cylinder A1, a second cylinder A2, and a third cylinder A3.
2 indicates a cylinder head which is fastened to the upper surface of the cylinder block 1 with a gasket 3 in between to form a combustion chamber 4, 5, 6 in each cylinder. The head 2 has intake ports 7.8.9 and exhaust ports 10, 11.1 at each cylinder location.
2.
前記シリンダブロック１内には′、各気筒Ａ１、Ａ２、
Ａ３の外周を互に連通ずるように囲って形成した冷却水
ジャケット１３を備え、該冷却水ジャケット１３には、
シリンダブロックｌにおける各気筒の列方向の一側面に
設けた冷却水人口１４からラジェータ（図示せず）で冷
却された冷却水を供給する一方、前記シリンダヘッド２
には、各気筒の燃焼室上部外側を互いに連通ずるように
形成した冷却水室１５が設けられ、該冷却水室１５内に
は、前記シリンダブロック１の冷却水ジャケット１３か
らの冷却水が、ガスケット３に気筒列の両側に沿って穿
設した複数個の通孔１６．１７から流入し、冷却水室１
５内の冷却水は、各気筒の列方向の他側面に設けた冷却
水出口１８からラジェータに流出するようになっている
。Inside the cylinder block 1 are cylinders A1, A2,
The cooling water jacket 13 is provided with a cooling water jacket 13 formed by surrounding the outer periphery of the A3 so as to communicate with each other, and the cooling water jacket 13 includes:
Cooling water cooled by a radiator (not shown) is supplied from a cooling water port 14 provided on one side in the row direction of each cylinder in the cylinder block l, while the cylinder head 2
is provided with a cooling water chamber 15 formed so as to communicate with each other on the outside of the upper part of the combustion chamber of each cylinder, and within the cooling water chamber 15, cooling water from the cooling water jacket 13 of the cylinder block 1 is provided. The water flows into the cooling water chamber 1 through a plurality of through holes 16 and 17 formed in the gasket 3 along both sides of the cylinder row.
The cooling water in the cylinder 5 flows out to the radiator from a cooling water outlet 18 provided on the other side of each cylinder in the row direction.
このような内燃機関では、各気筒Ａ１、Ａ２、Ａ３に対
する冷却は冷却水人口１４に近い第一気筒Ａ１が最も良
く、第二気筒Ａ２が次に悪く、そして冷却水人口１４か
ら最も遠い第三気筒Ａ３が最も悪ろくなり、従って各気
筒の温度は、逆に冷却水人口１４から遠い第三気筒Ａ３
が最も高く、第二気筒が次に低く、そして冷却水人口１
４に近い第一気筒Ａ１が最も低くなって、第二気筒Ａ２
の燃焼室５における火炎伝播は第三気筒Ａ３の燃焼室６
における火炎伝播より悪く、又第一気筒Ａ１の燃焼室４
における火炎伝播は第二気筒Ａ２の燃焼室５における火
炎伝播よりも悪くなる。In such an internal combustion engine, the cooling for each cylinder A1, A2, and A3 is the best in the first cylinder A1, which is closest to the cooling water population 14, the second cylinder A2 is the second worst, and the third cylinder, which is farthest from the cooling water population 14, is the best. Cylinder A3 is the worst, so the temperature of each cylinder is conversely the third cylinder A3, which is far from the cooling water population 14.
is the highest, the second cylinder is the next lowest, and the cooling water population is 1.
The first cylinder A1, which is close to 4, is the lowest, and the second cylinder A2
The flame propagation in the combustion chamber 5 of the third cylinder A3 is
The flame propagation is worse than that in the combustion chamber 4 of the first cylinder A1.
The flame propagation in the combustion chamber 5 of the second cylinder A2 is worse than that in the combustion chamber 5 of the second cylinder A2.
そこで本発明では、前記各気筒Ａ１、Ａ２、Ａ３の圧縮
比を、各気筒に就いて同じにすることなく、火炎伝播が
最も良い第三気筒Ａ３の圧縮比を最も低く、火炎伝播が
次いで悪い第二気筒Ａ２の圧縮比を前記第三気筒Ａ３の
圧縮比よりも高く、そして火炎伝播が最も想い第一気筒
ＡＩの圧縮比を前記第二気筒Ａ２の圧縮比よりも高く設
定したものである。Therefore, in the present invention, instead of making the compression ratios of the cylinders A1, A2, and A3 the same for each cylinder, the compression ratio of the third cylinder A3, which has the best flame propagation, is the lowest, and the third cylinder A3, which has the second worst flame propagation, has the lowest compression ratio. The compression ratio of the second cylinder A2 is set higher than the compression ratio of the third cylinder A3, and the compression ratio of the first cylinder AI is set higher than the compression ratio of the second cylinder A2 in order to improve flame propagation. .
には、ピストンが上死点にあるときの燃焼室の容積、つ
まり隙間容積を各気筒について異なった値にすれば良い
。To achieve this, the volume of the combustion chamber when the piston is at top dead center, that is, the gap volume, can be set to a different value for each cylinder.
前記のように、冷却水による冷却の良い従って温度が低
く火炎伝播の悪い気筒における圧縮比を、これより火炎
伝播の良い気筒における圧縮比よりも高くすることによ
り、当該気筒での火炎伝播は圧縮比を高くすることで促
進されるから、各気筒Ａ１、Ａ２、Ａ３に冷却むらがあ
っても、各気筒の火炎伝播を、圧縮比の調節設定によっ
て略同じに揃えることができるのである。As mentioned above, by setting the compression ratio in a cylinder that is well cooled by cooling water and therefore has a low temperature and poor flame propagation to a higher compression ratio than in a cylinder where flame propagation is better, flame propagation in that cylinder is reduced by compression. Since this is promoted by increasing the ratio, even if there is uneven cooling in each cylinder A1, A2, and A3, the flame propagation in each cylinder can be made substantially the same by adjusting the compression ratio.
従って本発明によれば、冷却水による冷却に冷却むらを
生じる各気筒での燃焼状態を、各気筒の圧縮比の変更設
定によって修正して各気筒について略同じにすることが
でき、しかも、一旦設定した圧縮比の変動は少なく、各
気筒における燃焼状懸が各気筒間について変動すること
を低減できるから、機関全体についての出力低下及び騒
音を安定して確実に軽減できると共に、排気ガスの悪化
を安定して確実に防止できる効果を有する。Therefore, according to the present invention, the combustion state in each cylinder, which causes uneven cooling due to cooling by cooling water, can be corrected by changing the compression ratio of each cylinder, and can be made substantially the same for each cylinder. There is little variation in the set compression ratio, and it is possible to reduce variations in the combustion condition between each cylinder, so it is possible to stably and reliably reduce the output reduction and noise of the entire engine, and also to reduce the deterioration of exhaust gas. It has the effect of stably and reliably preventing
図面は本発明の実施例を示し、第１図は機関の要部の紺
断正面図、第２図は第１図の平面図、第３図は第１図の
３−３視断面図、第４図は第１図の４−４視断面図であ
る。
１・・・シリンダブロック、２・・・シリンダヘッド、
ＡＩ、Ａ２、Ａ３・・・気筒、４．５．６・・・燃焼室
、１３・・・冷却水ジャケット、１４・・・冷却水入口
、１５・・・冷却水室、１８・・・冷却水出口。
手続補正書１発）
特許庁長官 若 杉 和 夫 殿
１、事件の表示
特願昭５８−１１７９３５号
２、発明の名称
水冷式多気筒内燃機関
３、補正をする者
事件との関係 特許出願人
任 所 大阪府池田市ダイハツ町１番１号氏 名（名称
） （２９６）ダイハツ工業株式会社４、代理人
住 所 大阪市北区天神橋２丁目北１番２１号５、？ｉ
ｌｉ正の対象
明細書の発明の詳細な説明の欄
６、補正の内容The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the main parts of the engine, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 of FIG. FIG. 4 is a sectional view taken along line 4-4 in FIG. 1... Cylinder block, 2... Cylinder head,
AI, A2, A3... Cylinder, 4.5.6... Combustion chamber, 13... Cooling water jacket, 14... Cooling water inlet, 15... Cooling water chamber, 18... Cooling water outlet. Procedural amendment 1) Commissioner of the Japan Patent Office Kazuo Wakasugi1, Indication of the case Japanese Patent Application No. 117935/19822, Name of the invention Water-cooled multi-cylinder internal combustion engine3, Person making the amendment Relationship to the case Patent applicant Position: 1-1 Daihatsu-cho, Ikeda-shi, Osaka Name (296) Daihatsu Motor Co., Ltd. 4, Agent address: 2-1-21-5, Kita-1, Tenjinbashi, Kita-ku, Osaka, Japan. i
li Column 6 of detailed description of the invention in the correct subject specification, contents of amendment
Claims (1)
機関において、各気筒のうち、冷却水の冷却によって温
度が低くなる気筒における圧縮比を、温度が高い他の気
筒における圧縮比よりも高い値に設定したことを特徴と
する水冷式多気筒内燃機関。(1) In a water-cooled multi-cylinder internal combustion engine with multiple cylinders arranged in a row, the compression ratio of the cylinder whose temperature is lower due to cooling of the cooling water is set to the compression ratio of the other cylinders whose temperature is higher. A water-cooled multi-cylinder internal combustion engine characterized by having a higher value than the ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11793583A JPS608429A (en) | 1983-06-28 | 1983-06-28 | Water-cooled multi-cylinder internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11793583A JPS608429A (en) | 1983-06-28 | 1983-06-28 | Water-cooled multi-cylinder internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS608429A true JPS608429A (en) | 1985-01-17 |
Family
ID=14723848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11793583A Pending JPS608429A (en) | 1983-06-28 | 1983-06-28 | Water-cooled multi-cylinder internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS608429A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4730579A (en) * | 1985-08-02 | 1988-03-15 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine cylinder head with port coolant passage independent of and substantially wider than combustion chamber coolant passage |
| US5353636A (en) * | 1992-08-07 | 1994-10-11 | Toyota Jidosha Kabushiki Kaisha | Device for determining misfiring of cylinders in multi-cylinder engines |
| US6223120B1 (en) | 1998-11-19 | 2001-04-24 | Jeremy Williams | Cylinder torque estimation using crankshaft angular response measurements |
-
1983
- 1983-06-28 JP JP11793583A patent/JPS608429A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4730579A (en) * | 1985-08-02 | 1988-03-15 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine cylinder head with port coolant passage independent of and substantially wider than combustion chamber coolant passage |
| US5353636A (en) * | 1992-08-07 | 1994-10-11 | Toyota Jidosha Kabushiki Kaisha | Device for determining misfiring of cylinders in multi-cylinder engines |
| US6223120B1 (en) | 1998-11-19 | 2001-04-24 | Jeremy Williams | Cylinder torque estimation using crankshaft angular response measurements |
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