JPH0281919A - Head cooling system for multicylinder air-cooled engine - Google Patents
Head cooling system for multicylinder air-cooled engineInfo
- Publication number
- JPH0281919A JPH0281919A JP23328688A JP23328688A JPH0281919A JP H0281919 A JPH0281919 A JP H0281919A JP 23328688 A JP23328688 A JP 23328688A JP 23328688 A JP23328688 A JP 23328688A JP H0281919 A JPH0281919 A JP H0281919A
- Authority
- JP
- Japan
- Prior art keywords
- fuel injection
- injection nozzle
- cooling air
- port
- hole forming
- 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.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 50
- 238000002347 injection Methods 0.000 claims abstract description 37
- 239000007924 injection Substances 0.000 claims abstract description 37
- 239000000446 fuel Substances 0.000 claims abstract description 35
- 238000003780 insertion Methods 0.000 claims description 30
- 230000037431 insertion Effects 0.000 claims description 30
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、多気筒空冷エンジンのヘッド部分の冷却装置
に関し、特にシリンダをクランク軸芯に沿わせて配置し
た直列多気筒空冷エンジンのヘッド冷却装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling device for the head portion of a multi-cylinder air-cooled engine, and in particular to a head cooling device for an in-line multi-cylinder air-cooled engine in which the cylinders are arranged along the crankshaft. Regarding equipment.
（従来技術）
直列多気筒空冷エンジンのヘッドを冷却する装置として
、従来、特開昭６２−１９７６５８号公報に示されたも
のがある。(Prior Art) As a device for cooling the head of an in-line multi-cylinder air-cooled engine, there is a device disclosed in Japanese Unexamined Patent Publication No. 197658/1983.
この従来のものでは、直列配置されたクランクの中心間
を結ぶ線を挟んでその一方の側に吸気ポートを、他方の
側に排気ポートをそれぞれ形成し、吸気ポート側に冷却
風導入口を設け、各７リング対応部を並列に通って吸気
ポート側から排気ポート側に冷却風経路を形成した構成
になっている。In this conventional model, an intake port is formed on one side of the line connecting the centers of the cranks arranged in series, an exhaust port is formed on the other side, and a cooling air inlet is provided on the intake port side. , a cooling air path is formed from the intake port side to the exhaust port side by passing through each of the seven ring corresponding parts in parallel.
（解決しようとする課題）
従来の構造では、ヘッドブロックにおけるシリンダの中
心間を結ぶ線を中心として一方の側面に吸気ポートを、
他方の側面に排気ポートをそれぞれ開口し、吸気ポート
形成側に冷却風導入口を形成していることから、冷却風
導入側での開口面積が小さくなるうえ、その部分での形
状が複雑になり、冷却風の流れを乱すという問題がある
。また、弁間部分に燃料噴射ノズル挿入部が形成しであ
ることから、この燃料噴射ノズル挿入部のボスが抵抗に
なり、冷却風は弁間部分を流れにくく、シリンダ間部分
を主にＭＬれることになるので、シリンダヘッドを均一
に冷却しにくいという問題もある。(Problem to be solved) In the conventional structure, the intake port is placed on one side of the head block, centered on the line connecting the centers of the cylinders.
Since the exhaust ports are opened on the other side and the cooling air inlet is formed on the side where the intake port is formed, the opening area on the cooling air introduction side becomes smaller and the shape of that part becomes more complicated. , there is a problem of disturbing the flow of cooling air. In addition, since the fuel injection nozzle insertion part is formed in the part between the valves, the boss of this fuel injection nozzle insertion part becomes a resistance, making it difficult for the cooling air to flow in the part between the valves, and ML mainly flows in the part between the cylinders. Therefore, there is also the problem that it is difficult to uniformly cool the cylinder head.
本発明は上述の問題に着目してなされたもので、ヘッド
ブロックでの冷却風を乱すことな（効率よ（流通させて
効率よ（冷却することを目的とする。The present invention has been made with attention to the above-mentioned problem, and its purpose is to efficiently cool the head block by circulating the cooling air without disturbing it.
（課題を解決するための手段）
上記目的を達成するために本発明は、直列多気筒エンジ
ンにおける各シリンダに対応させて、吸気弁口と排気弁
口とをクランク軸芯に沿う状態でヘッドブロックに形成
し、両弁口から吸気ポートと排気ポートを連出し、両ポ
ート間での左右一側に燃料噴射ノズル挿入穴形成部を配
設するとともに、吸気ポートと排気ポートとの少なくと
もいずれか一方、好ましくは吸気ポートを上方に導出し
、燃料噴射ノズル挿入穴形成部の配設側を冷却風圧送路
に連通させることにより、燃料噴射ノズル挿入部の配設
側を冷却風の入口側に形成したことを特徴としている。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a head block in which an intake valve port and an exhaust valve port are aligned along the crankshaft, corresponding to each cylinder in an in-line multi-cylinder engine. An intake port and an exhaust port are connected from both valve ports, and a fuel injection nozzle insertion hole forming part is provided on one side of the left and right between the two ports, and at least one of the intake port and the exhaust port is formed. Preferably, the intake port is led upward and the side where the fuel injection nozzle insertion hole formation part is arranged is communicated with the cooling air pressure passage, so that the side where the fuel injection nozzle insertion part is arranged is formed on the cooling air inlet side. It is characterized by what it did.
（作 用）
本発明では、吸気ポートと排気ポートとの少なくとも一
方を上方に導出させであるので、へ、ドブｏ２りの少な
くとも一側を広く開口させることができ、冷ＬＯ風が取
り込みやすくなる。また、燃料噴射ノズル挿入穴形成部
配設側を冷却風圧送路に連通させであるので、燃料噴射
ノズル挿入穴形成部は冷却風の上流側に位置することに
なり、流入直後の冷却風で燃料噴射ノズルを強力に冷却
できる。(Function) In the present invention, at least one of the intake port and the exhaust port is guided upward, so at least one side of the gutter can be opened widely, making it easier to take in the cold LO air. . In addition, since the side where the fuel injection nozzle insertion hole formation part is arranged is communicated with the cooling air pressure passage, the fuel injection nozzle insertion hole formation part is located on the upstream side of the cooling air, so that the cooling air immediately after flowing in is connected to the cooling air pressure passage. It can powerfully cool the fuel injection nozzle.
（実施例）
図面は本発明の実施例を示し、第１図は要部横断平面図
、第２図は多気筒空冷ディーゼルエンジンの中央縦断側
面図、第３図は同エンジンの一部切除正面図、第４図は
第１図のＩＶ−ＩＶ線断面図である。(Embodiment) The drawings show an embodiment of the present invention, in which Fig. 1 is a cross-sectional plan view of main parts, Fig. 2 is a central longitudinal sectional side view of a multi-cylinder air-cooled diesel engine, and Fig. 3 is a partially cutaway front view of the same engine. 4 is a sectional view taken along the line IV-IV in FIG. 1.
このエンジンは、クランクケース（１）とシリンダブロ
ック（２）とを一体に形成し、シリンダブロック（２）
の上側にヘッドブロック（３）を固定してエンジン本体
（Ｅ）を形成し、クランクケース（１）の前壁（４）か
ら突出しているクランク軸（５）の前端に冷却ファン（
６）を固定し、冷却ファン（６）を導風ケース（７）で
取り囲み、冷却ファン（６）で起風した冷却風をシリン
ダブロック（２）部及びへ。This engine has a crankcase (1) and a cylinder block (2) integrally formed.
A head block (3) is fixed on the upper side to form an engine body (E), and a cooling fan (
6) is fixed, the cooling fan (6) is surrounded by an air guide case (7), and the cooling air generated by the cooling fan (6) is directed to the cylinder block (2) and to the cylinder block (2).
トフロソク（３）部に送給することにより、エンジンを
冷却するようにしである。The engine is designed to be cooled by feeding the engine to the tofusoku (3) section.
ヘッドブロック（３）には第１図に示すように、各／リ
ンダ（８）に対応させて吸気ポート（９）と排気ポート
（１０）とが形成してあり、この吸気ポート（９）の吸
気弁口（１１）と排気ポート （１０）の排気弁口（１
２）は、クランク軸（５）と平行になる状態で配置しで
ある。そして、本実施例では隣合うクランク（８）にお
ける吸気弁口（１１）を近接して配置し、両吸気弁口（
１２）から導出した吸気ポート（９）は合流させて上向
きに導出しである。As shown in Fig. 1, the head block (3) is formed with an intake port (9) and an exhaust port (10) corresponding to each cylinder (8). Intake valve port (11) and exhaust port (10) Exhaust valve port (1)
2) is arranged parallel to the crankshaft (5). In this embodiment, the intake valve ports (11) of adjacent cranks (8) are arranged close to each other, and both intake valve ports (
The intake ports (9) led out from 12) are merged and led out upward.
一方、各シリンダ（８）部分での吸気弁口（１１）と排
気弁口（１２）との間における両弁口（ＩＩ）（１２）
を結ぶ線の一側に燃料噴射ノズル挿入穴（１３）が形成
してあり、排気ポート（１ｏ）は燃料噴射ノズル挿入穴
（１３）を形成していない側の側面に向かって導出しで
ある。この排気ポート（１０）は各シリンダ（８）に対
応して配置した一対のブツシュロッド挿通穴（ｌ４）間
をそれぞれ通るように形成しである。On the other hand, both valve ports (II) (12) between the intake valve port (11) and the exhaust valve port (12) in each cylinder (8) portion
A fuel injection nozzle insertion hole (13) is formed on one side of the line connecting the two, and the exhaust port (1o) is led out toward the side surface on the side where the fuel injection nozzle insertion hole (13) is not formed. . This exhaust port (10) is formed to pass between a pair of bush rod insertion holes (14) arranged corresponding to each cylinder (8).
燃料噴射ノズル挿入穴（１３）が配設されている側での
側面は、導風ケース（７）に連続して連出された導風板
（１４）により形成された冷却風圧送路（１６）に連通
接続しである。The side surface on the side where the fuel injection nozzle insertion hole (13) is arranged has a cooling air pressure channel (16) formed by a baffle plate (14) continuously extended to the baffle case (7). ) is connected for communication.
鉋ってヘッドブロック（２）内に流入した冷却風は燃ｔ
・）噴射ノズル挿入穴（１３）の形成ｆｉ（１７）を冷
却した後、弁間部分を通り、排気ポート（１０）の開口
側面から外部に放出されることになる。このため、ヘッ
ド流入直後の冷却風で燃料噴射ノズル及び燃料噴射ノズ
ル挿入穴形成部（１７）を冷却することになり、ノズル
を十分に冷却することができ、ノズルの耐久性を向上す
ることができるうえ、燃焼を良好に行うことができるよ
うになる。また、燃料噴射ノズル挿通穴（１３）を形成
している側での側面には吸気ポート（９）が開口してい
ないことから、その側面部分は太き（開放されることに
なり、冷却風が流入しやすく、ヘッドを十分に冷却する
ことができる。The cooling air that flows into the head block (2) after the plane is burnt
-) Formation of the injection nozzle insertion hole (13) After cooling the fi (17), it passes through the valve gap and is discharged to the outside from the opening side of the exhaust port (10). Therefore, the fuel injection nozzle and the fuel injection nozzle insertion hole forming part (17) are cooled by the cooling air immediately after the head flows in, and the nozzle can be sufficiently cooled, improving the durability of the nozzle. Not only that, but it also allows for better combustion. In addition, since the intake port (9) is not open on the side surface on the side where the fuel injection nozzle insertion hole (13) is formed, the side surface portion is thick (open) and the cooling air is can easily flow in, and the head can be sufficiently cooled.
なお、冷却風が燃料噴射ノズル挿入穴形成部（１７）と
確実に接触できるようにするため、第１図中に仮想線で
示すように、吸気ポート（９）の合流管部分ニ対応する
ヘッドブロック（３）の側面部分を壁（１８）で閉塞す
るように構成しても良い。In addition, in order to ensure that the cooling air comes into contact with the fuel injection nozzle insertion hole forming part (17), as shown by the imaginary line in FIG. The side portion of the block (3) may be closed with a wall (18).
図示は省略したが、排気ポート（１０）を合流させて上
方へ導出するとともに、吸気ポート（９）を個々にプソ
ンユロッド挿通孔側に導出するようにしてもよ（、また
、吸気ポート（９）及び排気ポート（１０）の両方を上
方へ導出するようにしてもよい。Although not shown, the exhaust ports (10) may be merged and guided upward, and the intake ports (9) may be individually led out to the pusonyu rod insertion hole side (also, the intake ports (9) and the exhaust port (10) may both be led out upward.
さらに上記実施例ではヘッドブロック（３）に燃料噴射
ノズル挿入穴（１３）を形成した直接噴射式のものにつ
いて述べたが、ヘッドブロック（３）に副室を形成し、
副室周壁に燃料噴射ノズル挿入穴（１３）を形成した副
室式ディーゼルエンジンのへ７ドブロツクを上記構成に
するようにしてもよい。この場合には副室周壁が燃料噴
射ノズル挿入穴形成部分（１７）となる。Furthermore, in the above embodiment, a direct injection type was described in which a fuel injection nozzle insertion hole (13) was formed in the head block (3), but a subchamber was formed in the head block (3),
A subchamber type diesel engine having a fuel injection nozzle insertion hole (13) formed in the circumferential wall of the subchamber may have the above structure. In this case, the peripheral wall of the sub-chamber becomes the fuel injection nozzle insertion hole forming portion (17).
（効 果）
本発明では、吸気ポートと排気ポートとの少なくとも一
方を上方に導出させであるので、ヘッドブロックの少な
くとも一側を広く開口させることができ、冷却風の取り
込み口を大きく形成して冷却性能を高めることができる
。(Effects) In the present invention, since at least one of the intake port and the exhaust port is led out upward, at least one side of the head block can be opened widely, and the cooling air intake port can be formed large. Cooling performance can be improved.
また、燃料噴射ノズル挿入穴形成部配設側を冷却風圧送
路に連通させであるので、燃料噴射ノズル挿入穴形成部
は冷却風の上流側に位置することになり、流入直後の冷
却風で燃料噴射ノズルを強力に冷却でき、燃料噴射ノズ
ルの耐久性を高めるとともに、燃焼性能を高めることが
できる。In addition, since the side where the fuel injection nozzle insertion hole formation part is arranged is communicated with the cooling air pressure passage, the fuel injection nozzle insertion hole formation part is located on the upstream side of the cooling air, so that the cooling air immediately after flowing in is connected to the cooling air pressure passage. The fuel injection nozzle can be powerfully cooled, increasing its durability and combustion performance.
また、吸気ポートと排気ポートのいずれか一方を上方に
導出するとともに、他方のポートを燃料噴射ノズル挿入
穴形成部を配設していない側の側面に導出するように形
成すると、動弁機構の構成を簡素化することができるう
え、各ポートの形成を容易に行える。In addition, if one of the intake port and the exhaust port is led upward, and the other port is formed to be led out to the side surface on which the fuel injection nozzle insertion hole formation part is not provided, it is possible to improve the valve mechanism. The configuration can be simplified, and each port can be easily formed.
さらに、吸気ポートを上方に、排気ポートを燃料噴射ノ
ズル挿入穴形成部を配設していない側の側面に導出する
ように構成すると、排気ポートを強力に冷却することが
でき、燃焼背圧を小さくすることができるうえ、排気騒
音を小さくすることができる。Furthermore, by configuring the intake port to lead upward and the exhaust port to the side surface on which the fuel injection nozzle insertion hole is not provided, the exhaust port can be powerfully cooled and combustion back pressure can be reduced. Not only can it be made smaller, but also the exhaust noise can be reduced.
図面は本発明の実施例を示し、第１図は要部横断平面図
、第２図は多気筒空冷ディーゼルエンジンの中央縦断側
面図、第３図は同エンジンの一部切除正面図、第４図は
第１図のＩＶ−１’／線断面図である。
３・・・ヘッドブロック、６・・・冷却ファン、８・・
・シリンダ、９・・吸気ポート、１０・・・ｔｊｌポー
ト、１１・・・吸気弁口、１２・・・排気弁口、１６・
・・冷却風圧送路、１７・・・燃料噴射ノズル挿入穴形
成部。
特許出願人 久保田鉄工株式会社
第
図
第３図
一〇Ω−
第２図
第４図The drawings show an embodiment of the present invention, in which FIG. 1 is a cross-sectional plan view of main parts, FIG. 2 is a central vertical cross-sectional side view of a multi-cylinder air-cooled diesel engine, FIG. 3 is a partially cutaway front view of the engine, and FIG. The figure is a sectional view taken along the line IV-1' in FIG. 3...Head block, 6...Cooling fan, 8...
・Cylinder, 9... Intake port, 10... TJL port, 11... Intake valve port, 12... Exhaust valve port, 16...
...Cooling air pressure feed path, 17...Fuel injection nozzle insertion hole forming part. Patent applicant Kubota Iron Works Co., Ltd. Figure 3 10Ω- Figure 2 Figure 4
Claims (1)
後に直列配置し、冷却ファン（６）で起風された冷却風
でヘッドブロック（３）を強制冷却するように構成した
多気筒エンジンにおいて、 各シリンダ（８）に対応させて吸気弁口（１１）と排気
弁口（１２）とをクランク軸芯に沿う状態でヘッドブロ
ック（３）に形成し、両弁口（１１）（１２）から吸気
ポート（９）と排気ポート（１０）を連出し、両ポート
（９）（１０）間での左右一側に燃料噴射ノズル挿入穴
形成部（１７）を設けるとともに、吸気ポート（９）と
排気ポート（１０）との少なくともいずれか一方を上方
に導出し、燃料噴射ノズル挿入穴形成部（１７）の配設
側を冷却風圧送路（１６）に連通させることにより、燃
料噴射ノズル挿入穴形成部（１７）の配設側を冷却風の
入口側に形成したことを特徴とする多気筒空冷エンジン
のヘッド冷却装置 ２、吸気ポート（９）と排気ポート（１０）との一方の
ポートを上方に導出するとともに、燃料噴射ノズル挿入
穴形成部（１７）を配設していない側の側面に他方のポ
ートを導出した請求項１に記載の多気筒空冷エンジンの
ヘッド冷却装置 ３、吸気ポート（９）を上方に導出するとともに、燃料
噴射ノズル挿入穴形成部（１７）を配設していない側の
側面に排気ポート（１２）を導出した請求項２に記載の
多気筒空冷エンジンのヘッド冷却装置[Claims] 1. A plurality of cylinders (8) are arranged in series along the crankshaft, and the head block (3) is forcibly cooled with cooling air blown by a cooling fan (6). In a multi-cylinder engine configured as shown in FIG. An intake port (9) and an exhaust port (10) are connected from the valve ports (11) and (12), and a fuel injection nozzle insertion hole forming portion (17) is provided on one side of the left and right between both ports (9) and (10). At the same time, at least one of the intake port (9) and the exhaust port (10) is guided upward, and the side where the fuel injection nozzle insertion hole forming part (17) is provided is communicated with the cooling air pressure channel (16). A head cooling device 2 for a multi-cylinder air-cooled engine, an intake port (9) and an exhaust port, characterized in that the side where the fuel injection nozzle insertion hole forming part (17) is arranged is formed on the cooling air inlet side. The multi-cylinder air cooling system according to claim 1, wherein one port of the fuel injection nozzle insertion hole forming part (17) is led out upward, and the other port is led out to the side surface on the side where the fuel injection nozzle insertion hole forming part (17) is not provided. Claim 2: The engine head cooling device 3 has an intake port (9) led out upward, and an exhaust port (12) led out to the side surface on which the fuel injection nozzle insertion hole forming part (17) is not provided. Head cooling system for multi-cylinder air-cooled engine described in
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63233286A JPH0723687B2 (en) | 1988-09-16 | 1988-09-16 | Head cooling device for multi-cylinder air-cooled engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63233286A JPH0723687B2 (en) | 1988-09-16 | 1988-09-16 | Head cooling device for multi-cylinder air-cooled engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0281919A true JPH0281919A (en) | 1990-03-22 |
| JPH0723687B2 JPH0723687B2 (en) | 1995-03-15 |
Family
ID=16952721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63233286A Expired - Lifetime JPH0723687B2 (en) | 1988-09-16 | 1988-09-16 | Head cooling device for multi-cylinder air-cooled engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0723687B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04103822A (en) * | 1990-08-21 | 1992-04-06 | Kubota Corp | Cooling device of straight type multiple cylinder air-cooled engine |
| JPH0532753U (en) * | 1991-10-11 | 1993-04-30 | ヤンマーデイーゼル株式会社 | Cylinder block structure of air-cooled engine |
| US5957104A (en) * | 1997-05-29 | 1999-09-28 | Suzuki Motor Corporation | Cylinder head structure of an internal combustion engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5153380U (en) * | 1974-10-22 | 1976-04-23 | ||
| JPS62197658A (en) * | 1986-02-24 | 1987-09-01 | Yanmar Diesel Engine Co Ltd | Cylinder head cooling device for internal combustion engine |
-
1988
- 1988-09-16 JP JP63233286A patent/JPH0723687B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5153380U (en) * | 1974-10-22 | 1976-04-23 | ||
| JPS62197658A (en) * | 1986-02-24 | 1987-09-01 | Yanmar Diesel Engine Co Ltd | Cylinder head cooling device for internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04103822A (en) * | 1990-08-21 | 1992-04-06 | Kubota Corp | Cooling device of straight type multiple cylinder air-cooled engine |
| JPH0532753U (en) * | 1991-10-11 | 1993-04-30 | ヤンマーデイーゼル株式会社 | Cylinder block structure of air-cooled engine |
| US5957104A (en) * | 1997-05-29 | 1999-09-28 | Suzuki Motor Corporation | Cylinder head structure of an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0723687B2 (en) | 1995-03-15 |
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