JP2521461Y2 - Internal combustion engine intake port - Google Patents
Internal combustion engine intake portInfo
- Publication number
- JP2521461Y2 JP2521461Y2 JP7023791U JP7023791U JP2521461Y2 JP 2521461 Y2 JP2521461 Y2 JP 2521461Y2 JP 7023791 U JP7023791 U JP 7023791U JP 7023791 U JP7023791 U JP 7023791U JP 2521461 Y2 JP2521461 Y2 JP 2521461Y2
- Authority
- JP
- Japan
- Prior art keywords
- flow
- combustion chamber
- intake air
- intake
- port
- 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
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【0001】[0001]
【産業上の利用分野】本考案は、内燃機関の吸気ポート
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake port of an internal combustion engine.
【0002】[0002]
【従来の技術】近年、自動車に用いられるディーゼルエ
ンジン等の内燃機関においては、排ガス規制の強化に伴
い、着火時期を遅らせて燃焼温度を下げ、N0xを低減
させることが試みられているが、この場合、あと燃えが
起きて黒煙が増加するため、この対策として燃料と吸気
との混合を改善すべく、吸気ポートに種々の改善がなさ
れている。Recently, in the internal combustion engine such as a diesel engine for use in an automobile, with the strengthening of exhaust gas regulations, delaying the ignition timing lowers the combustion temperature, although it is attempted to reduce the N0 x, In this case, afterburning occurs and black smoke increases. Therefore, various measures have been taken to the intake port in order to improve the mixing of fuel and intake air as a countermeasure against this.
【0003】この種の燃料と吸気との混合の改善を図っ
た吸気ポートとしては、例えば、実開昭53−8730
9号公報に記載されたようなものが存在し、これは、図
5,6に示される如く、吸気を燃焼室3内において旋回
流とするヘリカル型ポート1と、吸気を燃焼室3の略接
線方向に流入せしめ前記旋回流に衝突合流せしめるダイ
レクショナル型ポート2とから吸気ポートを構成してあ
る。As an intake port designed to improve the mixing of this type of fuel and intake air, for example, the actual open port Sho 53-8730.
There is one such as that described in Japanese Patent Publication No. 9, which is a helical port 1 for making intake air into a swirl flow in the combustion chamber 3 as shown in FIGS. An intake port is constituted by a directional port 2 which is tangentially introduced so as to collide with and merge with the swirling flow.
【0004】[0004]
【考案が解決しようとする課題】前述の如き内燃機関の
吸気ポートでは、ヘリカル型ポート1から燃焼室3内に
流入する旋回流に対しダイレクショナル型ポート2から
の吸気を衝突させているものの、乱れの面で充分な強さ
が得られず、特に吸気流量の少ない低中速域において燃
料と吸気との混合が不充分となり、黒煙の量が特に低中
速域において高くなっていた。In the intake port of the internal combustion engine as described above, the swirl flow flowing from the helical port 1 into the combustion chamber 3 collides the intake air from the directional port 2 with each other. Sufficient strength was not obtained in terms of turbulence, and mixing of fuel and intake was insufficient, especially in the low and middle speed regions where the intake air flow rate was small, and the amount of black smoke was particularly high in the low and middle speed regions.
【0005】本考案は、斯かる実情に鑑み、吸気流量の
少ない低中速域においても吸気の乱れ強さを増加させ、
燃料と吸気との混合を充分に行い、排ガス中のNOx並
びに黒煙の低減を図り得る内燃機関の吸気ポートを提供
しようとするものである。In view of the above situation, the present invention increases the turbulence intensity of intake air even in the low and medium speed regions where the intake air flow rate is small,
It is an object of the present invention to provide an intake port of an internal combustion engine capable of sufficiently mixing fuel and intake air and reducing NO x and black smoke in exhaust gas.
【0006】[0006]
【課題を解決するための手段】本考案は、吸気マニホー
ルドに接続される入口流路と、該入口流路から連続して
延び吸気バルブステム軸線周りに巻き回し燃焼室へ通じ
る渦巻状流路と、前記入口流路と渦巻状流路との境界部
における上壁面に前記燃焼室へ向って一段下がるよう形
成され吸気の一部を剥離流として燃焼室へ導く段差部
と、前記渦巻状流路下流端部に突設され前記剥離流以外
の吸気を渦巻流として前記燃焼室へ導くタング部とを有
するヘリカル型ポートと、吸気マニホールドから導入さ
れる吸気を燃焼室の略接線方向に直線流として流入せし
め且つ前記タング部に沿って燃焼室へ導かれた渦巻流に
衝突させるためのシュラウド部が突設された直線状流路
を有するダイレクショナル型ポートとを備えたことを特
徴とするものである。SUMMARY OF THE INVENTION The present invention comprises an inlet passage connected to an intake manifold, and a spiral passage extending continuously from the inlet passage and wound around the intake valve stem axis and leading to a combustion chamber. A stepped portion formed on an upper wall surface at a boundary portion between the inlet flow passage and the spiral flow passage so as to descend one step toward the combustion chamber, and leading a part of intake air to the combustion chamber as a separated flow; A helical port having a tongue portion projecting at the downstream end portion and introducing the intake air other than the separated flow into the combustion chamber as a swirl flow, and the intake air introduced from the intake manifold as a linear flow in a substantially tangential direction of the combustion chamber. And a directional port having a linear flow path having a protruding shroud portion for colliding with a swirl flow introduced into the combustion chamber along the tongue portion. is there
【0007】[0007]
【作用】従って、ヘリカル型ポートに吸入された吸気
は、入口流路から渦巻状流路に流入する際、その一部が
段差部により上壁面から剥離して剥離流として燃焼室へ
流入すると共に、それ以外は前記入口流路から渦巻状流
路を通過しタング部に沿って燃焼室へ渦巻流として流入
し、一方、ダイレクショナル型ポートに吸入された吸気
は、直線状流路からシュラウド部に沿って燃焼室へ直線
流として流入し、前記渦巻流と衝突して合流し、ある程
度の乱れを生じた合成流となり、該合成流は、前記燃焼
室内周面に沿い大きな旋回流となっている剥離流と衝突
して合流し、更に強い乱れを生じる。Therefore, when the intake air sucked into the helical port flows into the spiral flow passage from the inlet flow passage, a part of the intake air is separated from the upper wall surface by the step portion and flows into the combustion chamber as a separated flow. Other than that, the intake air that has passed through the spiral flow passage from the inlet flow passage and flows into the combustion chamber along the tongue portion as a swirl flow, while the intake air sucked into the directional port is from the straight flow passage to the shroud portion. Flow into the combustion chamber as a linear flow, collide with the swirl flow, and merge into a combined flow with some turbulence. The combined flow becomes a large swirl flow along the peripheral surface of the combustion chamber. The separated flow collides with the separated flow and merges, resulting in stronger turbulence.
【0008】[0008]
【実施例】以下、図面に基づいて本考案の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【0009】図1〜4は本考案の一実施例であり、図示
していない吸気マニホールドに接続される入口流路1a
と、該入口流路1aから連続して延び吸気バルブステム
4軸線周りに巻き回し燃焼室3へ通じる渦巻状流路1b
と、前記入口流路1aと渦巻状流路1bとの境界部にお
ける上壁面に前記燃焼室3へ向って一段下がるよう形成
され吸気の一部を剥離流6として燃焼室3へ導く段差部
1dと、前記渦巻状流路1b下流端部に突設され前記剥
離流6以外の吸気を渦巻流7として前記燃焼室3へ導く
タング部1cとを有するヘリカル型ポート1を形成する
と共に、前記吸気マニホールドから導入される吸気を燃
焼室3の略接線方向に直線流8として流入せしめ且つ前
記タング部1cに沿って燃焼室3へ導かれた渦巻流7に
衝突させるためのシュラウド部2bが突設された直線状
流路2aを有するダイレクショナル型ポート2を形成
し、前記ヘリカル型ポート1とダイレクショナル型ポー
ト2とから吸気ポートを構成する。1 to 4 show an embodiment of the present invention, which is an inlet passage 1a connected to an intake manifold (not shown).
And a spiral flow passage 1b which continuously extends from the inlet flow passage 1a and is wound around the axis of the intake valve stem 4 and communicates with the combustion chamber 3.
And a stepped portion 1d which is formed on the upper wall surface at the boundary between the inlet flow passage 1a and the spiral flow passage 1b so as to descend one step toward the combustion chamber 3 and guides a part of the intake air to the combustion chamber 3 as a separated flow 6. And a tongue portion 1c protruding from the downstream end of the spiral flow passage 1b to guide the intake air other than the separated flow 6 into the combustion chamber 3 as a spiral flow 7, and the intake air A shroud portion 2b for projecting intake air introduced from the manifold as a linear flow 8 in a substantially tangential direction of the combustion chamber 3 and colliding with a swirl flow 7 guided to the combustion chamber 3 along the tongue portion 1c is provided in a protruding manner. The directional port 2 having the linear flow path 2a is formed, and the helical port 1 and the directional port 2 constitute an intake port.
【0010】尚、図中、5はダイレクショナル型ポート
2に設けられた吸気バルブステムである。In the figure, reference numeral 5 is an intake valve stem provided in the directional port 2.
【0011】前述の如く構成したので、ヘリカル型ポー
ト1に吸入された吸気は、入口流路1aから渦巻状流路
1bに流入する際、その一部が段差部1dにより上壁面
から剥離して剥離流6として燃焼室3へ流入すると共
に、それ以外は前記入口流路1aから渦巻状流路1bを
通過しタング部1cに沿って燃焼室3へ渦巻流7として
流入する。With the above-described structure, when the intake air sucked into the helical port 1 flows into the spiral flow passage 1b from the inlet flow passage 1a, a part thereof is separated from the upper wall surface by the step portion 1d. In addition to flowing into the combustion chamber 3 as the separated flow 6, the other flow passes through the spiral flow passage 1b from the inlet flow passage 1a and flows into the combustion chamber 3 along the tongue portion 1c as the spiral flow 7.
【0012】一方、ダイレクショナル型ポート2に吸入
された吸気は、直線状流路2aからシュラウド部2bに
沿って燃焼室3へ直線流8として流入し、燃焼室3上端
からの高さ位置が0.5D(Dは燃焼室の内径)以内の
領域において前記渦巻流7と衝突して合流し、ある程度
の乱れを生じた合成流9となる。On the other hand, the intake air sucked into the directional port 2 flows into the combustion chamber 3 from the linear flow passage 2a along the shroud portion 2b as a linear flow 8, and the height position from the upper end of the combustion chamber 3 is changed. In a region within 0.5D (D is the inner diameter of the combustion chamber), the combined flow 9 collides with the swirl flow 7 and merges into a combined flow 9 with some turbulence.
【0013】該合成流9は、燃焼室3上端からの高さ位
置が0.5D〜1.0Dの領域において、前記燃焼室3
内周面に沿い大きな旋回流となっている剥離流6と衝突
して合流し、更に強い乱れを生じる。The combined flow 9 is generated in the combustion chamber 3 in the region where the height position from the upper end of the combustion chamber 3 is 0.5D to 1.0D.
The separated flow 6, which is a large swirling flow along the inner peripheral surface, collides with and merges with each other to generate further turbulence.
【0014】こうして、燃焼室3内において吸気の衝突
が二回に亘って行われる形となるため、吸気流量の少な
い低中速域においても、燃料と吸気との混合が充分に行
われ、排ガス中のNOx低減に加え、黒煙低減が可能と
なる。In this way, since the collision of the intake air is carried out twice in the combustion chamber 3, the fuel and the intake air are sufficiently mixed even in the low and medium speed regions where the intake air flow rate is small, and the exhaust gas is exhausted. It is possible to reduce black smoke in addition to reducing NO x in the inside.
【0015】尚、本考案の内燃機関の吸気ポートは、上
述の実施例にのみ限定されるものではなく、本考案の要
旨を逸脱しない範囲内において種々変更を加え得ること
は勿論である。Incidentally, the intake port of the internal combustion engine of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
【0016】[0016]
【考案の効果】以上説明したように、本考案の内燃機関
の吸気ポートによれば、燃焼室内において吸気の衝突を
二回に亘って行わせることが可能となり、吸気流量の少
ない低中速域においても吸気の乱れ強さを増加させ、燃
料と吸気との混合を充分に行い、排ガス中のNOx並び
に黒煙の低減を図り得るという優れた効果を奏し得る。As described above, according to the intake port of the internal combustion engine of the present invention, it is possible to cause the intake air to collide twice in the combustion chamber, and the low intake air flow rate in the low and medium speed range. Also in this case, the turbulence intensity of the intake air can be increased, the fuel and the intake air can be sufficiently mixed, and NO x and black smoke in the exhaust gas can be reduced, which is an excellent effect.
【図1】本考案の一実施例の斜視図である。FIG. 1 is a perspective view of an embodiment of the present invention.
【図2】本考案の一実施例におけるヘリカル型ポートの
側断面図である。FIG. 2 is a side sectional view of a helical port according to an embodiment of the present invention.
【図3】本考案の一実施例における吸気流の概要を表わ
す平面図である。FIG. 3 is a plan view showing an outline of intake air flow in an embodiment of the present invention.
【図4】本考案の一実施例における吸気流の概要を表わ
す側面図(図3のIV−IV矢視相当図)である。FIG. 4 is a side view showing an outline of an intake air flow in one embodiment of the present invention (a view corresponding to an arrow IV-IV in FIG. 3).
【図5】従来例の斜視図である。FIG. 5 is a perspective view of a conventional example.
【図6】図5に示す従来例の側断面図である。FIG. 6 is a side sectional view of the conventional example shown in FIG.
1 ヘリカル型ポート 1a 入口流路 1b 渦巻状流路 1c タング部 1d 段差部 2 ダイレクショナル型ポート 2a 直線状流路 2b シュラウド部 3 燃焼室 4 吸気バルブステム 6 剥離流 7 渦巻流 8 直線流 9 合成流 1 Helical type port 1a Inlet flow channel 1b Spiral flow channel 1c Tongue section 1d Step section 2 Directional port 2a Linear flow channel 2b Shroud section 3 Combustion chamber 4 Intake valve stem 6 Separation flow 7 Swirling flow 8 Linear flow 9 Synthesis Flow
Claims (1)
と、該入口流路から連続して延び吸気バルブステム軸線
周りに巻き回し燃焼室へ通じる渦巻状流路と、前記入口
流路と渦巻状流路との境界部における上壁面に前記燃焼
室へ向って一段下がるよう形成され吸気の一部を剥離流
として燃焼室へ導く段差部と、前記渦巻状流路下流端部
に突設され前記剥離流以外の吸気を渦巻流として前記燃
焼室へ導くタング部とを有するヘリカル型ポートと、 吸気マニホールドから導入される吸気を燃焼室の略接線
方向に直線流として流入せしめ且つ前記タング部に沿っ
て燃焼室へ導かれた渦巻流に衝突させるためのシュラウ
ド部が突設された直線状流路を有するダイレクショナル
型ポートとを備えたことを特徴とする内燃機関の吸気ポ
ート。1. An inlet passage connected to an intake manifold, a spiral passage extending continuously from the inlet passage and wound around an intake valve stem axis to reach a combustion chamber, and the inlet passage and the spiral passage. A stepped portion that is formed on the upper wall surface at the boundary with the flow channel so as to descend one step toward the combustion chamber and guides a part of the intake air as a separated flow to the combustion chamber; A helical port having a tongue portion for guiding intake air other than the separated flow into the combustion chamber as a swirl flow, and intake air introduced from the intake manifold is introduced as a linear flow in a substantially tangential direction of the combustion chamber and along the tongue portion. An intake port of an internal combustion engine, comprising: a directivity type port having a linear flow path in which a shroud portion is provided so as to collide with a spiral flow guided to a combustion chamber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7023791U JP2521461Y2 (en) | 1991-07-16 | 1991-07-16 | Internal combustion engine intake port |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7023791U JP2521461Y2 (en) | 1991-07-16 | 1991-07-16 | Internal combustion engine intake port |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0510750U JPH0510750U (en) | 1993-02-12 |
JP2521461Y2 true JP2521461Y2 (en) | 1996-12-25 |
Family
ID=13425760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7023791U Expired - Fee Related JP2521461Y2 (en) | 1991-07-16 | 1991-07-16 | Internal combustion engine intake port |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2521461Y2 (en) |
-
1991
- 1991-07-16 JP JP7023791U patent/JP2521461Y2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0510750U (en) | 1993-02-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |