JPH06117326A - Exhaust port of exhaust two valve type internal combustion engine - Google Patents
Exhaust port of exhaust two valve type internal combustion engineInfo
- Publication number
- JPH06117326A JPH06117326A JP40479690A JP40479690A JPH06117326A JP H06117326 A JPH06117326 A JP H06117326A JP 40479690 A JP40479690 A JP 40479690A JP 40479690 A JP40479690 A JP 40479690A JP H06117326 A JPH06117326 A JP H06117326A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- port
- flow guide
- internal combustion
- combustion engine
- 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.)
- Withdrawn
Links
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ディーゼルエンジン
の排気２弁式内燃機関の排気ポートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust port of an exhaust two-valve internal combustion engine of a diesel engine.
【０００２】[0002]
【従来の技術】吸気２弁、排気２弁の４弁式のバルブシ
ステムを備えたディーゼルエンジンにおいて、その排気
２弁によって開閉される排気ポートについて説明する
と、図３および図４に示すように構成されている。すな
わち、シリンダブロック１の上部に設けられたシリンダ
ヘッド２には２つの排気ポート３ａ，３ｂが並設されて
いる。そして、これら排気ポート３ａ，３ｂにはバルブ
シート４ａ，４ｂが設けられている。2. Description of the Related Art In a diesel engine equipped with a four-valve type valve system of two intake valves and two exhaust valves, an exhaust port opened and closed by the two exhaust valves will be described. As shown in FIGS. Has been done. That is, the cylinder head 2 provided above the cylinder block 1 is provided with two exhaust ports 3a and 3b in parallel. Valve seats 4a and 4b are provided on the exhaust ports 3a and 3b.
【０００３】前記２つの排気ポート３ａ，３ｂはシリン
ダヘッド２に設けられた屈曲したポート合流部５を介し
て排気口６に連通している。また、シリンダヘッド２に
は前記２つの排気ポート３ａ，３ｂに対向するバルブガ
イド７ａ，７ｂが設けられ、このバルブガイド７ａ，７
ｂには排気ポート３ａ，３ｂを開閉する排気バルブ８
ａ，８ｂが上下動自在に支持されている。そして、排気
バルブ８ａ，８ｂの開弁時にシリンダ内の排気ガスが排
気ポート３ａ，３ｂからポート合流部５を介して排気口
６から排気される。The two exhaust ports 3a and 3b communicate with an exhaust port 6 through a bent port confluent portion 5 provided in the cylinder head 2. Further, the cylinder head 2 is provided with valve guides 7a and 7b facing the two exhaust ports 3a and 3b.
An exhaust valve 8 for opening and closing the exhaust ports 3a and 3b is provided at b.
a and 8b are supported so as to be vertically movable. Then, when the exhaust valves 8a, 8b are opened, the exhaust gas in the cylinder is exhausted from the exhaust ports 3a, 3b through the port merging portion 5 and the exhaust port 6.
【０００４】ところで、２つの排気ポート３ａ，３ｂは
シリンダの軸方向、つまり鉛直方向に開口しており、排
気口６は排気ポート３ａ，３ｂの軸心に対して直角に開
口している。By the way, the two exhaust ports 3a and 3b are opened in the axial direction of the cylinder, that is, in the vertical direction, and the exhaust port 6 is opened at a right angle to the axial center of the exhaust ports 3a and 3b.
【０００５】したがって、ポート合流部５は直角に屈曲
しており、排気バルブ８ａ，８ｂの開弁時にシリンダ内
の排気ガスがポート合流部５を介して排気口６に向かう
際に、通路が狭められるため排気抵抗が大きいという問
題があった。Therefore, the port merging portion 5 is bent at a right angle, and when the exhaust gas in the cylinder goes toward the exhaust port 6 through the port merging portion 5 when the exhaust valves 8a and 8b are opened, the passage is narrowed. Therefore, there was a problem that the exhaust resistance was large.
【０００６】そこで、従来においては、排気ガスの排気
抵抗を低減させるために、２つの排気ポート３ａ，３ｂ
の境界部９にポート合流部５に突出するフローガイド１
０を設け、このフローガイド１０によって排気ポート３
ａ，３ｂを通過した排気ガスがスムーズに排気口６に流
れるようにしている。また、フローガイド１０には冷却
水を流通するための空洞部１０ａが設けられている。Therefore, conventionally, in order to reduce the exhaust resistance of the exhaust gas, the two exhaust ports 3a and 3b are used.
Flow guide 1 protruding to the port confluence 5 at the boundary 9 of the
0 is provided, and the exhaust port 3 is provided by this flow guide 10.
The exhaust gas passing through a and 3b is made to flow smoothly to the exhaust port 6. Further, the flow guide 10 is provided with a cavity 10a for circulating cooling water.
【０００７】[0007]
【発明が解決しようとする課題】ところが、２つの排気
ポート３ａ，３ｂの境界部９にポート合流部５に垂直に
突出するフローガイド１０を設けると、２つの排気ポー
ト３ａ，３ｂから同時に流れる排気ガスが合流部で渦流
となり、排気ガスがポート合流部５を介して排気口６に
向かう際に、通路が狭められる状態となる。排気流量係
数が小さく、エンジンの燃費低下、スモークの増加の原
因となっていた。However, if a flow guide 10 is provided at the boundary portion 9 between the two exhaust ports 3a and 3b so as to project perpendicularly to the port merging portion 5, the exhaust gas flowing from the two exhaust ports 3a and 3b at the same time. The gas becomes a vortex at the confluence portion, and when the exhaust gas goes to the exhaust port 6 through the port confluence portion 5, the passage is narrowed. The exhaust flow rate coefficient was small, which caused the fuel consumption of the engine to decrease and smoke to increase.
【０００８】この発明は前記事情に着目してなされたも
ので、その目的とするところは、エンジンの燃費向上、
排気ガス、スモークの低減を図ることができる排気２弁
式内燃機関の排気ポートを提供することにある。The present invention has been made in view of the above circumstances, and its purpose is to improve fuel economy of an engine,
An object of the present invention is to provide an exhaust port of an exhaust two-valve internal combustion engine that can reduce exhaust gas and smoke.
【０００９】[0009]
【課題を解決するための手段】この発明は、シリンダヘ
ッドに設けられた２つの排気ポートを屈曲したポート合
流部を介して排気口に連通するとともに、前記２つの排
気ポートの境界部に前記ポート合流部に向かって突出す
るフローガイドを設けた排気２弁式内燃機関の排気ポー
トにおいて、前記フローガイドをポート合流部の屈曲方
向に傾斜させるとともに、その傾斜角θをθ＝７０±１
０°にしたことにある。According to the present invention, two exhaust ports provided in a cylinder head are communicated with an exhaust port through a bent port merging portion, and the port is provided at a boundary portion between the two exhaust ports. In an exhaust port of an exhaust two-valve internal combustion engine provided with a flow guide projecting toward a merging portion, the flow guide is inclined in the bending direction of the port merging portion, and the inclination angle θ is θ = 70 ± 1.
It was set to 0 °.
【００１０】[0010]
【作用】排気バルブが開弁すると、排気ガスは２つの排
気ポートを通ってポート合流部に向かう際に、ポート合
流部の屈曲方向に傾斜するフローガイドに案内されて排
気口から排気される。When the exhaust valve opens, the exhaust gas is exhausted from the exhaust port while being guided to the port merging portion through the two exhaust ports by being guided by the flow guide inclined in the bending direction of the port merging portion.
【００１１】[0011]
【実施例】以下、この発明の一実施例を図面に基づいて
説明するが、従来と共通する部分は同一番号を付して説
明を省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１２】図１および図２に示すように、シリンダヘ
ッド２に設けられた２つの排気ポート３ａ，３ｂの境界
部９にはポート合流部５に向かって突出するフローガイ
ド１１が設けられている。As shown in FIGS. 1 and 2, a flow guide 11 projecting toward the port merging portion 5 is provided at a boundary portion 9 between the two exhaust ports 3a and 3b provided in the cylinder head 2. .
【００１３】このフローガイド１１は、シリンダヘッド
２と一体に成形されており、シリンダヘッド２に９０°
の合流角度に屈曲されたポート合流部５の屈曲方向に傾
斜している。なお、１２の冷却水を流通させる空洞部で
ある。The flow guide 11 is formed integrally with the cylinder head 2, and the cylinder head 2 has a 90 ° angle.
Is inclined in the bending direction of the port merging portion 5 which is bent at the merging angle. It is to be noted that this is a hollow portion for circulating 12 cooling waters.
【００１４】すなわち、フローガイド１１における排気
口６に対面する一側面には傾斜面１１ａが形成され、他
側面には垂直面１１ｂとこの垂直面１１ｂの上端から連
続する円弧面１１ｃを有している。したがって、フロー
ガイド１１の先端部はポート合流部５の屈曲方向に迫り
出した迫り出し部１１ｄを有している。That is, an inclined surface 11a is formed on one side surface of the flow guide 11 facing the exhaust port 6, and a vertical surface 11b and an arc surface 11c continuous from the upper end of the vertical surface 11b are formed on the other side surface. There is. Therefore, the front end of the flow guide 11 has a protruding portion 11d that protrudes in the bending direction of the port merging portion 5.
【００１５】このフローガイド１１は、排気ポート３
ａ，３ｂから屈曲したポート合流部５を介して排気口６
に向かう排気ガスがスムーズに流れるように案内するも
ので、前記傾斜面１１ａは傾斜角θをθ＝７０±１０°
に設定している。This flow guide 11 has an exhaust port 3
Exhaust port 6 through a port confluence 5 bent from a and 3b
It guides the exhaust gas toward the smooth flow, and the inclined surface 11a has an inclination angle θ of θ = 70 ± 10 °.
Is set to.
【００１６】したがって、排気バルブ８ａ，８ｂが開弁
すると、排気ガスは２つの排気ポート３ａ，３ｂを通っ
てポート合流部５に向かう。ポート合流部５は９０°の
角度で屈曲しているが、その屈曲方向に７０°傾斜して
いる傾斜面１１ａと垂直面１１ｂおよび円弧面１１ｃに
よって排気ガスが案内され、排気口６に向かって排気さ
れる。Therefore, when the exhaust valves 8a and 8b are opened, the exhaust gas flows toward the port merging portion 5 through the two exhaust ports 3a and 3b. Although the port merging portion 5 is bent at an angle of 90 °, the exhaust gas is guided by the inclined surface 11a, the vertical surface 11b, and the arc surface 11c that are inclined 70 ° in the bending direction, and the exhaust gas is directed toward the exhaust port 6. Exhausted.
【００１７】フローガイド１１の傾斜面１１ａの傾斜角
θは、本発明者の実験結果によるもので、傾斜面１１ａ
の傾斜角θが、６０°〜９０°まで複数のフローガイド
を用意し、２つの排気ポート３ａ，３ｂの境界部９には
ポート合流部５に向かって突設して実際に排気ガスを流
して排気流量係数を計測したところ、図３に示すよう
に、ポート合流部角度９０°に対する流量係数割合は、
θ＝７０°が最も高く、θ＝６０°とθ＝８０°がそれ
に続くという結果が得られた。The inclination angle θ of the inclined surface 11a of the flow guide 11 is based on the experimental result of the present inventor.
A plurality of flow guides having an inclination angle θ of 60 ° to 90 ° are prepared, and the exhaust gas is actually flowed by projecting toward the port merging portion 5 at the boundary portion 9 of the two exhaust ports 3a and 3b. As a result of measuring the exhaust flow rate coefficient as shown in FIG. 3, the flow rate ratio with respect to the port merging angle of 90 ° is
The result obtained was that θ = 70 ° was the highest, followed by θ = 60 ° and θ = 80 °.
【００１８】したがって、フローガイド１１の傾斜面１
１ａにおける傾斜角θをθ＝７０±１０°に設定するこ
とにより、排気流量係数が１３％向上した。排気流量係
数がアップすることにより、シリンダに残留する排気ガ
スの量も少なくなり、効率的に吸気されることから、エ
ンジンの燃費向上、排気ガス、スモークの低減を図るこ
とができるTherefore, the inclined surface 1 of the flow guide 11
By setting the inclination angle θ in 1a to θ = 70 ± 10 °, the exhaust flow coefficient was improved by 13%. By increasing the exhaust flow rate coefficient, the amount of exhaust gas remaining in the cylinder is also reduced, and the gas is efficiently taken in, so it is possible to improve the fuel efficiency of the engine and reduce exhaust gas and smoke.
【００１９】[0019]
【発明の効果】以上説明したように、この発明によれ
ば、２つの排気ポートの境界部にポート合流部に向かっ
て突出するフローガイドを設け、このフローガイドをポ
ート合流部の屈曲方向に傾斜させ、その傾斜角θをθ＝
７０±１０°にしたことを特徴とする。したがって、簡
単な構造でありながら、エンジンの燃費向上、排気ガ
ス、スモークの低減を図ることができるという効果があ
る。As described above, according to the present invention, a flow guide projecting toward the port merging portion is provided at the boundary between two exhaust ports, and the flow guide is inclined in the bending direction of the port merging portion. And the inclination angle θ is θ =
It is characterized in that it is set to 70 ± 10 °. Therefore, there is an effect that the fuel consumption of the engine can be improved and the exhaust gas and the smoke can be reduced despite the simple structure.
【図１】この発明の一実施例に係る排気２弁式内燃機関
の一部を示す縦断側面図。FIG. 1 is a vertical sectional side view showing a part of an exhaust two-valve internal combustion engine according to an embodiment of the present invention.
【図２】同実施例のフローガイドを拡大して示す縦断側
面図。FIG. 2 is a vertical cross-sectional side view showing an enlarged flow guide of the same embodiment.
【図３】同実施例のフローガイドの傾斜角と排気流量係
数との関係を示すグラフ図。FIG. 3 is a graph showing a relationship between an inclination angle of a flow guide and an exhaust gas flow coefficient in the same example.
【図４】従来の排気２弁式内燃機関の一部を示す縦断側
面図。FIG. 4 is a vertical sectional side view showing a part of a conventional exhaust two-valve internal combustion engine.
【図５】同従来のフローガイドを拡大して示す縦断側面
図。FIG. 5 is a vertical cross-sectional side view showing an enlarged view of the conventional flow guide.
２…シリンダヘッド、３ａ，３ｂ…排気ポート、５…ポ
ート合流部、６…排気口、９…境界部、１１…フローガ
イド、１１ａ…傾斜面。2 ... Cylinder head, 3a, 3b ... Exhaust port, 5 ... Port merging part, 6 ... Exhaust port, 9 ... Boundary part, 11 ... Flow guide, 11a ... Sloping surface.
Claims (1)
ポートを屈曲したポート合流部を介して排気口に連通す
るとともに、前記２つの排気ポートの境界部に前記ポー
ト合流部に向かって突出するフローガイドを設けた排気
２弁式内燃機関の排気ポートにおいて、前記フローガイ
ドをポート合流部の屈曲方向に傾斜させるとともに、そ
の傾斜角θをθ＝７０±１０°にしたことを特徴とする
排気２弁式内燃機関の排気ポート。1. A flow in which two exhaust ports provided in a cylinder head communicate with an exhaust port via a bent port confluence portion and project toward a boundary portion between the two exhaust ports toward the port confluence portion. In an exhaust port of an exhaust two-valve internal combustion engine provided with a guide, the flow guide is inclined in a bending direction of a port merging portion, and an inclination angle θ thereof is θ = 70 ± 10 °. Exhaust port of valve type internal combustion engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40479690A JPH06117326A (en) | 1990-12-21 | 1990-12-21 | Exhaust port of exhaust two valve type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40479690A JPH06117326A (en) | 1990-12-21 | 1990-12-21 | Exhaust port of exhaust two valve type internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06117326A true JPH06117326A (en) | 1994-04-26 |
Family
ID=18514456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP40479690A Withdrawn JPH06117326A (en) | 1990-12-21 | 1990-12-21 | Exhaust port of exhaust two valve type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06117326A (en) |
-
1990
- 1990-12-21 JP JP40479690A patent/JPH06117326A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980312 |