JPH0579336A - Intake air controller of engine - Google Patents
Intake air controller of engineInfo
- Publication number
- JPH0579336A JPH0579336A JP3238192A JP23819291A JPH0579336A JP H0579336 A JPH0579336 A JP H0579336A JP 3238192 A JP3238192 A JP 3238192A JP 23819291 A JP23819291 A JP 23819291A JP H0579336 A JPH0579336 A JP H0579336A
- Authority
- JP
- Japan
- Prior art keywords
- intake
- valve
- control valve
- port
- 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.)
- Granted
Links
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば吸気弁、排気弁
を２本づつ備えた４バルブエンジンに好適の吸気制御装
置に関し、特に低速回転又は低負荷時に吸気ポートの断
面積を絞り込むことにより、吸気量が少ない場合にもシ
リンダ軸方向の流速を高めていわゆる縦スワールを発生
でき、もって燃費を向上できるようにした吸気制御装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake control device suitable for, for example, a four-valve engine having two intake valves and two exhaust valves, and particularly by narrowing the cross-sectional area of the intake port during low speed rotation or low load. The present invention relates to an intake control device capable of generating a so-called vertical swirl by increasing the flow velocity in the cylinder axis direction even when the intake air amount is small, thereby improving fuel consumption.
【０００２】[0002]
【従来の技術】エンジンの燃費を向上させるには、低速
回転時又は低負荷運転時等の吸気量の少ない場合でも流
速を高めることにより、燃焼室内に縦スワールを発生さ
せ、希薄空燃比での燃焼を安定化させることが有効であ
る。このような縦スワールを発生できる吸気制御装置と
して、従来、例えば特公昭５９−５７６７号公報に開示
されているように、吸気ポートの吸気弁開口近傍に制御
板を起伏可能に配置し、低速回転又は低負荷運転時には
上記制御板を起立させて吸気ポート断面積を絞るように
したものがある。2. Description of the Related Art In order to improve the fuel efficiency of an engine, a vertical swirl is generated in the combustion chamber by increasing the flow velocity even when the intake air amount is small, such as during low-speed rotation or low-load operation, to generate a lean air-fuel ratio. It is effective to stabilize the combustion. As an intake control device capable of generating such a vertical swirl, conventionally, as disclosed in, for example, Japanese Patent Publication No. 59-5767, a control plate is arranged in the vicinity of an intake valve opening of an intake port so as to be capable of undulating and is rotated at a low speed. Alternatively, there is one in which the control plate is erected during a low load operation to reduce the cross-sectional area of the intake port.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記従来
の吸気制御装置においては、低速回転時等に制御板の下
流側に空間が生じ、ここに吸気流が巻き込まれて乱れが
生じるので、期待通りの縦スワールが得難いという問題
がある。また、制御板を起伏させるという構造上、制御
板が比較的長いものとなり、それだけ大きな配置スペー
スか必要となってシリンダヘッド部分が大きくなる問題
があり、また、全開時においても制御板が吸気ポート内
に残留することとなり、これが高速回転時等に吸気抵抗
となるという問題もある。However, in the above-mentioned conventional intake control device, a space is formed on the downstream side of the control plate at the time of low speed rotation or the like, and the intake flow is entrained therein to cause turbulence, which is expected. There is a problem that vertical swirl is difficult to obtain. In addition, due to the structure of undulating the control plate, the control plate becomes relatively long, and there is a problem that the cylinder head part becomes large due to the need for a large arrangement space. There is also a problem in that it remains inside and becomes an intake resistance at the time of high speed rotation.
【０００４】本発明は、上記従来の問題を解決するもの
であって、吸気流の乱れを抑制して縦スワールを確実に
得ることができ、また配置スペースが小さくて済み、か
つ高速回転時等における吸気抵抗の増大を回避できるエ
ンジンの吸気制御装置を提供することを目的としてい
る。The present invention solves the above-mentioned problems of the prior art by suppressing the turbulence of the intake air flow to reliably obtain a vertical swirl, requiring a small arrangement space, and rotating at high speeds. It is an object of the present invention to provide an intake control device for an engine that can avoid an increase in intake resistance in the engine.
【０００５】[0005]
【課題を解決するための手段】そのために、本発明のエ
ンジンの吸気制御装置は、吸気ポート１０に連通され、
燃焼室９に開口される吸気弁開口１０ａと、吸気弁開口
１０ａを開閉する吸気弁１２と、吸気ポート１０の吸気
弁開口１０ａ近傍に回動可能に配設される吸気制御弁２
１と、吸気制御弁２１に形成され、吸気弁１２の弁軸１
２ａが入り込む逃げ溝２１ｂとを備え、吸気制御弁２１
は、吸気ポート１０断面積を絞る位置と、吸気ポート１
０の壁内に退避する位置に選択的に回動されることを特
徴とする。なお、上記構成に付加した番号は、理解を容
易にするために図面と対比させるためのもので、これに
より本発明の構成が何ら限定されるものではない。To this end, the intake control device for an engine of the present invention is connected to the intake port 10,
An intake valve opening 10a opened in the combustion chamber 9, an intake valve 12 opening and closing the intake valve opening 10a, and an intake control valve 2 rotatably arranged near the intake valve opening 10a of the intake port 10.
1 and a valve shaft 1 of the intake valve 12 formed in the intake control valve 21.
2a and an escape groove 21b into which the intake control valve 21
Is the position where the cross-sectional area of the intake port 10 is reduced and the intake port 1
It is characterized in that it is selectively rotated to a position retracted into the wall of 0. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings for easy understanding, and the configurations of the present invention are not limited thereby.
【０００６】[0006]
【作用】本発明に係わる吸気制御装置によれば、エンジ
ン低速回転等のように吸気量の少ない場合は、吸気制御
弁を吸気ポート断面積を絞る位置に回動させ、これによ
り、吸気は流速が高められるとともに吸気ポートの一側
の壁に沿って流れ、燃焼室の中央付近に方向性を持って
吹き込まれ、その結果、縦スワールが確実に発生する。
また、高速回転等のように吸気量が多い場合は、吸気制
御弁を開位置に回動させ、その吸気凹部が吸気ポートと
略面一になり、吸気ポート全体を抵抗なく流れ、燃焼室
に吹き込まれる。According to the intake control device of the present invention, when the intake amount is small, such as when the engine rotates at a low speed, the intake control valve is rotated to a position where the cross-sectional area of the intake port is reduced. Is increased and flows along the wall on one side of the intake port, and is blown with directivity in the vicinity of the center of the combustion chamber, and as a result, vertical swirls are reliably generated.
In addition, when there is a large amount of intake air, such as in high-speed rotation, the intake control valve is turned to the open position, and the intake recess becomes almost flush with the intake port, flowing through the intake port without resistance and into the combustion chamber. Be blown in.
【０００７】[0007]
【実施例】以下本発明の実施例を図面を参照しつつ説明
する。図１は本発明のエンジンの吸気制御装置の１実施
例を示す断面図、図２は図１のＸ−Ｘ線に沿って矢印方
向から見た断面図、図３は吸気制御弁の異なる方向から
見た一部正面図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an engine intake control device of the present invention, FIG. 2 is a sectional view taken along the line XX of FIG. It is a partial front view seen from.
【０００８】図１において、１は４サイクル４バルブエ
ンジンであり、クランクケース２上にシリンダブロック
３、シリンダヘッド４を積層して結合し、該シリンダヘ
ッド４の上側合面にヘッドカバー５を被せた構造のもの
である。上記シリンダブロック３内に設けられたシリン
ダライナー６内には、ピストン７が摺動自在に挿入され
ており、このピストン７はコンロッド８でクランク軸
（図示せず）に連結されている。In FIG. 1, reference numeral 1 denotes a four-cycle four-valve engine, in which a cylinder block 3 and a cylinder head 4 are laminated and joined on a crankcase 2, and a head cover 5 is put on an upper mating surface of the cylinder head 4. It is of structure. A piston 7 is slidably inserted in a cylinder liner 6 provided in the cylinder block 3, and the piston 7 is connected to a crankshaft (not shown) by a connecting rod 8.
【０００９】上記シリンダヘッド４の下部には、ピスト
ン７に対向して燃焼室９が凹設され、図２に示すよう
に、中心部に点火プラグ４ａが配設されると共に、該燃
焼室９に開口する吸気弁開口１０ａ、排気弁開口１１ａ
がそれぞれ２つづつ形成され、吸気ポート１０および排
気ポート１１に連通されている。この吸気弁開口１０に
は吸気弁１２が、排気弁開口１１には排気弁１３が、そ
れぞれ各開口１０、１１を開閉可能に配置されている。
吸気弁１２および排気弁１３の弁軸１２ａ、１３ａに
は、その上端にスプリング１４、１５を介してリフタ１
６、１７がそれぞれ装着され、各リフタ１６、１７上に
は、これを駆動するカム軸１８、１９が配設されてい
る。A combustion chamber 9 is formed in the lower portion of the cylinder head 4 so as to face the piston 7, and a spark plug 4a is disposed at the center of the combustion chamber 9 as shown in FIG. Intake valve opening 10a, exhaust valve opening 11a
2 are formed respectively, and are connected to the intake port 10 and the exhaust port 11. An intake valve 12 is arranged in the intake valve opening 10, and an exhaust valve 13 is arranged in the exhaust valve opening 11 so that the openings 10 and 11 can be opened and closed, respectively.
The valve shafts 12a and 13a of the intake valve 12 and the exhaust valve 13 have lifters 1 at their upper ends via springs 14 and 15, respectively.
6 and 17 are mounted respectively, and cam shafts 18 and 19 for driving the lifters 16 and 17 are arranged on the lifters 16 and 17, respectively.
【００１０】吸気ポート１０の吸気弁開口１０ａ近傍に
は、円弧状に屈曲した屈曲部が形成されており、この屈
曲部には、図２に示すように、隣接する２つの吸気ポー
ト１０、１０を連通する弁穴２０がカム軸方向に形成さ
れている。この弁穴２０内には、吸気ポート１０の通路
断面積を変化させるための吸気制御弁２１が回動自在に
軸支され、吸気制御弁２１の一端には、回動レバー２２
が固定されている。この吸気制御弁２１は、吸気ポート
１０の断面径より大きい径を有する断面円形の丸棒から
なり、図３に示すように、吸気ポート１０と交差する箇
所に、吸気ポート１０の断面形状と同形状の吸気凹部２
１ａを切り欠くとともに、吸気凹部２１ａの反対側に吸
気弁１２の弁軸１２ａが入り込む逃げ溝２１ｂを形成し
ている。また、吸気ポート１０の底壁には吸気制御弁２
１が退避できる凹部１０ｂ（図４Ａ）が形成される。In the vicinity of the intake valve opening 10a of the intake port 10, a bent portion bent in an arc shape is formed. In this bent portion, as shown in FIG. 2, two adjacent intake ports 10, 10 are provided. Is formed in the cam shaft direction. An intake control valve 21 for changing the passage cross-sectional area of the intake port 10 is rotatably and pivotally supported in the valve hole 20, and a rotary lever 22 is provided at one end of the intake control valve 21.
Is fixed. The intake control valve 21 is made of a round bar having a circular cross section with a diameter larger than that of the intake port 10. As shown in FIG. 3, the intake control valve 21 has the same cross-sectional shape as the intake port 10 at a position intersecting with the intake port 10. Shaped intake recess 2
Notch 1a is formed, and an escape groove 21b into which the valve shaft 12a of the intake valve 12 is inserted is formed on the opposite side of the intake recess 21a. Further, the intake control valve 2 is provided on the bottom wall of the intake port 10.
A recess 10b (FIG. 4A) is formed in which 1 can be retracted.
【００１１】上記吸気制御弁２１の制御は、回動レバー
２２を電動モータにより駆動させるようにしてもよい
し、スロットルレバーとリンクさせてもよいし、吸気管
負圧により駆動させるようにしてもよい。For controlling the intake control valve 21, the rotary lever 22 may be driven by an electric motor, may be linked with a throttle lever, or may be driven by negative pressure in the intake pipe. Good.
【００１２】上記構成からなる本発明の作用を図４およ
び図５により説明する。エンジンの高速回転、又は高負
荷運転時のように吸気量が多い場合は、図４（Ａ）に示
すように、吸気制御弁２１は、全開位置に回動され吸気
ポート１０の壁内に退避し、これにより吸気凹部２１ａ
が吸気ポート１０と同形状に形成されているため、吸気
制御弁２１が吸気抵抗となることなく、吸気が円滑に行
われる。エンジンの低速回転、又は低負荷運転時のよう
に吸気量が少ない場合は、図４（Ｂ）に示すように、吸
気制御弁２１は絞り位置に回動される。そのため吸気ポ
ート１０が絞られるため、吸気はこの絞り部で流速が高
められ、かつ、吸気ポート１０の一側の壁面に沿って流
れ、燃焼室９の中央付近に方向性をもって吹き込まれる
結果、図１に矢印で示すように縦スワールが発生する。
この場合、吸気制御弁２１に逃げ溝２１ｂを形成したこ
とから、該制御弁２１を吸気弁開口１０ａに近接させ、
絞り効果を高めることができるとともに、該制御弁２１
の下流側に空間が生じることがなく吸気流の巻き込みを
防止できるので、前記方向性をさらに確実なものにでき
る。その結果、空燃比を希薄にしても燃焼を安定化で
き、燃費の向上を図ることができる。The operation of the present invention having the above structure will be described with reference to FIGS. When the amount of intake air is large, such as during high-speed engine rotation or high-load operation, the intake control valve 21 is rotated to the fully open position and retracted into the wall of the intake port 10 as shown in FIG. 4 (A). As a result, the intake recess 21a
Is formed in the same shape as the intake port 10, the intake control valve 21 does not become an intake resistance, and intake is smoothly performed. When the intake air amount is small such as when the engine is rotating at a low speed or when operating under a low load, the intake control valve 21 is rotated to the throttle position as shown in FIG. 4 (B). Therefore, since the intake port 10 is throttled, the flow velocity of the intake air is increased at this throttle portion, and the intake air flows along the wall surface on one side of the intake port 10 and is blown in the vicinity of the center of the combustion chamber 9 with directionality. A vertical swirl occurs as indicated by an arrow in 1.
In this case, since the escape groove 21b is formed in the intake control valve 21, the control valve 21 is brought close to the intake valve opening 10a,
The throttling effect can be enhanced and the control valve 21
Since there is no space on the downstream side of the air flow and the intake air can be prevented from being entrained, the directionality can be further ensured. As a result, combustion can be stabilized even if the air-fuel ratio is made lean, and fuel efficiency can be improved.
【００１３】図５は、エンジン回転数と出力の関係を示
し、曲線Ａは吸気制御弁２１を閉じた場合の特性曲線
で、曲線Ｂは吸気制御弁２１を開いた場合の特性曲線で
ある。従って、特性曲線Ａ、Ｂの交点の回転数Ｒ１で吸
気制御弁２１を開閉するように制御すれば、両方の特性
曲線の長所を備えた制御ができる。FIG. 5 shows the relationship between the engine speed and the output. Curve A is a characteristic curve when the intake control valve 21 is closed, and curve B is a characteristic curve when the intake control valve 21 is open. Therefore, if the intake control valve 21 is controlled to open and close at the rotational speed R1 at the intersection of the characteristic curves A and B, control having the advantages of both characteristic curves can be performed.
【００１４】図６は吸気制御弁２１の他の実施例を示
し、（Ａ）は拡大断面図、（Ｂ）は斜視図、（Ｃ）は駆
動機構の他の例を示す拡大断面図である。図Ａにおい
て、吸気ポート１０の底壁には駆動軸２３により回転駆
動される吸気制御弁２１が配設される。吸気制御弁２１
は、図Ｂに示すように、先端に逃げ溝２１ｂと抑止片２
１ｃと有し、吸気制御弁２１が吸気ポート１０を絞る位
置に回動するとき、吸気弁１２の弁軸１２が逃げ溝２１
ｂ内に入りこむため、絞り効果を高めることができる。
なお、図Ｃに示すように、抑止片２１ｃにギヤ２１ｄを
形成し、このギヤ２１ｄと噛み合う駆動ギヤ２５を設
け、駆動ギヤ２５により吸気制御弁２１を回動させるよ
うにしてもよい。FIG. 6 shows another embodiment of the intake control valve 21, (A) is an enlarged sectional view, (B) is a perspective view, and (C) is an enlarged sectional view showing another example of the drive mechanism. .. In FIG. A, an intake control valve 21 that is rotationally driven by a drive shaft 23 is arranged on the bottom wall of the intake port 10. Intake control valve 21
As shown in FIG. B, the relief groove 21b and the restraining piece 2 are provided at the tip.
1c, and when the intake control valve 21 is rotated to a position where the intake port 10 is narrowed, the valve shaft 12 of the intake valve 12 has a clearance groove 21.
Since it enters the inside of b, the diaphragm effect can be enhanced.
As shown in FIG. C, a gear 21d may be formed on the restraining piece 21c, a drive gear 25 that engages with the gear 21d may be provided, and the drive gear 25 may rotate the intake control valve 21.
【００１５】[0015]
【発明の効果】以上の説明から明らかなように本発明に
よれば、吸気流の乱れを抑制して縦スワールを確実に得
ることができ、また配置スペースが小さくて済み、かつ
高速回転時等における吸気抵抗の増大を回避できる。As is apparent from the above description, according to the present invention, the turbulence of the intake air flow can be suppressed and the vertical swirl can be reliably obtained, and the arrangement space is small, and at the time of high speed rotation, etc. It is possible to avoid an increase in intake resistance at.
【図１】本発明のエンジンの吸気制御装置の１実施例を
示す断面図FIG. 1 is a sectional view showing an embodiment of an intake control device for an engine of the present invention.
【図２】図１のＸ−Ｘ線に沿って矢印方向から見た断面
図FIG. 2 is a sectional view taken along the line XX of FIG. 1 as seen from the direction of the arrow.
【図３】本発明に係わる吸気制御弁を異なる方向から見
た一部正面図FIG. 3 is a partial front view of the intake control valve according to the present invention viewed from different directions.
【図４】本発明の作用を説明するための拡大断面図FIG. 4 is an enlarged sectional view for explaining the operation of the present invention.
【図５】本発明の作用を説明するための図でエンジン回
転数と出力の関係を示す図FIG. 5 is a diagram for explaining the operation of the present invention, showing the relationship between engine speed and output.
【図６】吸気制御弁の他の実施例を示し、（Ａ）は拡大
断面図、（Ｂ）は斜視図、（Ｃ）は駆動機構の他の例を
示す拡大断面図FIG. 6 shows another embodiment of the intake control valve, (A) is an enlarged sectional view, (B) is a perspective view, and (C) is an enlarged sectional view showing another example of the drive mechanism.
９…燃焼室、１０…吸気ポート、１０ａ…吸気弁開口、
１２…吸気弁 １２ａ…弁軸、２１…吸気制御弁、２１ｂ…逃げ溝9 ... Combustion chamber, 10 ... Intake port, 10a ... Intake valve opening,
12 ... Intake valve 12a ... Valve shaft, 21 ... Intake control valve, 21b ... Escape groove
Claims (1)
る吸気弁開口と、該吸気弁開口を開閉する吸気弁と、前
記吸気ポートの吸気弁開口近傍に回動可能に配設される
吸気制御弁と、該吸気制御弁に形成され、前記吸気弁の
弁軸が入り込む逃げ溝とを備え、前記吸気制御弁は、吸
気ポート断面積を絞る位置と、前記吸気ポートの壁内に
退避する位置に選択的に回動されることを特徴とするエ
ンジンの吸気制御装置。1. An intake valve opening communicating with an intake port and opening to a combustion chamber, an intake valve opening and closing the intake valve opening, and a rotatably disposed near the intake valve opening of the intake port. An intake control valve and an escape groove formed in the intake control valve, into which the valve shaft of the intake valve enters, the intake control valve retracts into a position where the cross-sectional area of the intake port is narrowed and inside the wall of the intake port. An intake control device for an engine, wherein the intake control device is selectively rotated to a desired position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23819291A JP3229626B2 (en) | 1991-09-18 | 1991-09-18 | Engine intake control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23819291A JP3229626B2 (en) | 1991-09-18 | 1991-09-18 | Engine intake control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0579336A true JPH0579336A (en) | 1993-03-30 |
| JP3229626B2 JP3229626B2 (en) | 2001-11-19 |
Family
ID=17026529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23819291A Expired - Fee Related JP3229626B2 (en) | 1991-09-18 | 1991-09-18 | Engine intake control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3229626B2 (en) |
-
1991
- 1991-09-18 JP JP23819291A patent/JP3229626B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3229626B2 (en) | 2001-11-19 |
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