JP3707934B2

JP3707934B2 - Intake manifold

Info

Publication number: JP3707934B2
Application number: JP20991998A
Authority: JP
Inventors: 真敏木村; 啓太西川; 隆立川
Original assignee: Daihatsu Motor Co Ltd; Toyota Motor Corp
Current assignee: Daihatsu Motor Co Ltd; Toyota Motor Corp
Priority date: 1998-07-24
Filing date: 1998-07-24
Publication date: 2005-10-19
Anticipated expiration: 2018-07-24
Also published as: JP2000045880A

Description

【０００１】
【発明の属する技術分野】
本発明はエンジンにおけるインテークマニホールドに関し、特にＥＧＲガスを導入するＥＧＲガス導入口を有するインテークマニホールドに関するするものである。
【０００２】
【従来の技術】
吸入空気中にＥＧＲガスを導入するようにした従来のインテークマニホールドとしては、例えば実開平３−７３６４９号公報には、各気筒に対する複数の接続口が形成されたコレクタ部の内部に、隔壁板にて接続口の並列方向に沿うＥＧＲガス導入空間を区画形成するとともに、この隔壁板にＥＧＲガス分配孔を設け、コレクタ部で新気とＥＧＲガスを混合して気筒に供給するようにしたものが開示されている。
【０００３】
ところが、このような構成では吸入空気が各接続口に向けて流れるコレクタ部内でＥＧＲガスを分散供給して混合するようにしているため、各気筒に供給される混合ガスの吸入空気とＥＧＲガスの混合量を均一にするのが困難でかつ吸入空気とＥＧＲガスの混合も十分に行われないという問題がある。
【０００４】
そこで、図２に示すように、インテークマニホールド２１に各気筒に接続される複数の接続口が形成されたコレクタ部２２とこのコレクタ部２２に連通口２６を介して連通する混合室２４とを設け、混合室２４に吸入空気入口２７とＥＧＲガス導入口２９を設け、吸入空気とＥＧＲガスを混合室２４で十分に混合してから連通口２６を通してコレクタ部２２に流入させるようにしたものが提案されている。
【０００５】
詳しく説明すると、混合室２４の連通口２６とは反対側の端壁２８の中央部にＥＧＲガス導入口２９が配設されるとともに、混合室２４の一側壁に吸入空気入口２７が形成されている。そして、この吸入空気入口２７の外面にスロットル弁３２がその軸芯Ｐを混合室２４の長手方向の軸芯Ｏと直交する方向に向けて配設され、スロットル弁３２とベンチュリ筒３１の間を通った吸入空気が、ＥＧＲガス導入口２９が配設された端壁２８の前部に流入するように構成されている。
【０００６】
【発明が解決しようとする課題】
ところが、上記のような構成では、ベンチュリ筒３１とスロットル弁３２の間を通って吸入空気入口２７から混合室２４に流入した吸入空気は、白抜き矢印で示すように、吸入空気入口２７と対向する壁面と混合室２４の中央部の間を通って連通口２６に向けて流れ、一方ＥＧＲガス導入口２９から混合室２４に導入されたＥＧＲガスは矢印で示すように混合室２４の側壁に沿って壁際を流れる特性があり、混合室２４における吸入空気とＥＧＲガスの混合効果が十分に得られず、そのため気筒間で排ガス性能にばらつきが大きくなって、エンジン全体の排ガス性能の向上が望めないという問題があった。
【０００７】
本発明は、このような従来の問題点に鑑み、ＥＧＲガスを吸入空気と十分に混合して各気筒に供給でき、排ガス性能の向上を図ることができるインテークマニホールドを提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明のインテークマニホールドは、吸入空気中にＥＧＲガスを導入するＥＧＲガス導入口を有するインテークマニホールドであって、各気筒に接続される複数の接続口が形成されたコレクタ部と、このコレクタ部に対して連通口を介して連通される混合室とを備え、前記混合室の長手方向の一端部に吸入空気入口部とＥＧＲガス導入口が接続され、混合室の長手方向の他端部に前記連通口が設けられ、前記吸入空気入口部は混合室の長手方向の側壁に開口されるとともに、この吸入空気入口部にスロットル弁がその回転軸芯を混合室の長手方向に沿わせて配設され、吸入空気がスロットル弁を通過して前記吸入空気入口から混合室に流入し、混合室の長手方向の中心軸回りの旋回流となって前記連通口に向けて流れるように構成され、前記ＥＧＲガス導入口は、上記旋回流の中心部に向けて開口するように形成されていることを特徴とする。本発明によれば、吸入空気が、混合室の長手方向に回転軸芯が沿っているスロットル弁を通過して吸入空気入口から混合室内に流入することで、吸入空気は前記吸入空気入口からスロットル弁の回転軸心と直交する方向に流量差を有して混合室に流入し、その結果吸入空気は混合室の長手方向の中心軸回りの旋回流となり、その中心部に形成された負圧領域にＥＧＲガス導入口から導入されたＥＧＲガスが吸入されて混合されるとともに、壁面に沿って流れるＥＧＲガスも旋回する吸入空気とぶつかり合って効果的に混合され、したがって各気筒に対してＥＧＲガスを吸入空気と十分に混合した状態で供給することができ、各気筒の排ガス性能を均一化でき、エンジン全体の排ガス性能の向上を図ることができる。
【００１０】
【発明の実施の形態】
以下、本発明の一実施形態を図１を参照して説明する。
【００１１】
図１において、１は自動車の４気筒エンジンに装着されるインテークマニホールドであり、横長のコレクタ部２の一側に各気筒に対する４つの接続口３が並列して形成されている。このコレクタ部２の他側の略中央部から長手方向一端側に向けてコレクタ部２の略半分〜３分の１程度の適当な長さの混合室４が一体的に設けられている。混合室４の側壁５の内、混合室４とコレクタ部２を区画している隔壁部５ａには、コレクタ部２の略中央部に連通口６が開口され、混合室４とコレクタ部２が互いに連通されている。
【００１２】
混合室４の連通口６から離れた一端部の上面には、この混合室４内に吸入空気を導入する吸入空気入口７が形成されている。また、混合室４の連通口６から離れた端壁８にはＥＧＲガスを導入するＥＧＲガス導入口９が形成され、このＥＧＲガス導入口９からＥＧＲガス導入管１０が一体的に突出形成されている。
【００１３】
吸入空気入口７の上部にはスロットル弁取付部１１が形成されるとともに、このスロットル弁取付部１１はスロットル弁１２の軸芯Ｐが混合室４の長手方向に平行なＥＧＲガス導入口９の軸芯Ｏと平行となるように構成されている。また、ＥＧＲガス導入口９は混合室４の中央位置ではなく、側壁５の近傍に位置するように下方に変位させて配設されている。具体的には、ＥＧＲガス導入口９の軸芯Ｏと側壁５との距離が、ＥＧＲガス導入口９の半径の１．５倍以下、好適には１．１〜１．３倍程度の位置に配設されている。
【００１４】
次に、以上の構成のインテークマニホールド１の作用を説明する。任意の開度に開かれたスロットル弁１２から吸入空気入口７を通って混合室４内に流入してきた吸入空気は、図１（ａ）、（ｂ）に白抜き矢印で示すように、混合室４の側壁５の隔壁部５ａに沿って下向きに流下した後そのまま側壁に沿って旋回し、混合室４の長手方向の中心軸回りの旋回流となって連通口６に向けて流れる。そのため、この旋回流の中心部に負圧領域が形成されてＥＧＲガス導入口９から導入されたＥＧＲガスが吸引され、吸入空気の旋回流に巻き込まれて混合されるとともに、混合室４の側壁５に沿って流れるＥＧＲガスも上記旋回する吸入空気とぶつかり合って効果的に混合される。また、ＥＧＲガス導入口９が混合室４の側壁５近傍に配設されているので、旋回する吸入空気と混合室４の側壁５に沿って流れるＥＧＲガスがさらに確実にぶつかり合って一層確実に混合される。かくして、吸入空気は混合室４でＥＧＲガスが十分に混合された状態となり、ＥＧＲガスが均等に分散混合された状態の吸入空気が連通口６を通ってコレクタ部２に流れ込む。
【００１５】
コレクタ部２の略中央部に流入した、ＥＧＲガスが均等に混合された吸入空気は、このコレクタ部２で各接続口３に均等に分散されてそれぞれ対応する気筒に供給される。したがって、各気筒に対して吸入空気をＥＧＲガスが十分に混合された状態で供給することができ、各気筒の排ガス性能を均一化でき、エンジン全体の排ガス性能の向上を図ることができる。
【００１６】
【発明の効果】
本発明のインテークマニホールドによれば、吸入空気入口を通って混合室内に流入してきた吸入空気は混合室の長手方向の中心軸回りの旋回流となり、その中心部に負圧領域が形成されてＥＧＲガス導入口から導入されたＥＧＲガスが吸入混合されるとともに、壁面に沿って流れるＥＧＲガスも旋回する吸入空気とぶつかり合って効果的に混合され、したがって各気筒に対してＥＧＲガスを吸入空気と十分に混合した状態で供給することができ、各気筒の排ガス性能を均一化でき、エンジン全体の排ガス性能の向上を図ることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態のインテークマニホールドを示し、（ａ）は一部横断して示した平面図、（ｂ）は（ａ）のＡ−Ａ矢視断面側面図である。
【図２】従来例のインテークマニホールドを示し、（ａ）は部分縦断面図、（ｂ）は（ａ）のＢ−Ｂ矢視断面図である。
【符号の説明】
１インテークマニホールド
２コレクタ部
３接続口
４混合室
５側壁
６連通口
７吸入空気入口
９ＥＧＲガス導入口
１１スロットル弁取付部
１２スロットル弁
ＯＥＧＲガス導入口９の軸芯
Ｐスロットル弁１２の軸芯[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake manifold in an engine, and more particularly to an intake manifold having an EGR gas inlet for introducing EGR gas.
[0002]
[Prior art]
As a conventional intake manifold in which EGR gas is introduced into the intake air, for example, in Japanese Utility Model Publication No. 3-73649, a partition plate is provided inside a collector portion in which a plurality of connection ports for each cylinder are formed. The EGR gas introduction space along the parallel direction of the connection port is partitioned and EGR gas distribution holes are provided in the partition plate so that fresh air and EGR gas are mixed and supplied to the cylinder at the collector portion. It is disclosed.
[0003]
However, in such a configuration, since the EGR gas is dispersedly supplied and mixed in the collector portion where the intake air flows toward each connection port, the intake air of the mixed gas supplied to each cylinder and the EGR gas are mixed. There is a problem that it is difficult to make the mixing amount uniform and the intake air and the EGR gas are not sufficiently mixed.
[0004]
Therefore, as shown in FIG. 2, a collector portion 22 in which a plurality of connection ports connected to each cylinder are formed in the intake manifold 21 and a mixing chamber 24 communicating with the collector portion 22 via a communication port 26 are provided. The mixing chamber 24 is provided with an intake air inlet 27 and an EGR gas introduction port 29 so that the intake air and EGR gas are sufficiently mixed in the mixing chamber 24 and then flowed into the collector portion 22 through the communication port 26. Has been.
[0005]
More specifically, an EGR gas introduction port 29 is disposed at the center of the end wall 28 opposite to the communication port 26 of the mixing chamber 24, and an intake air inlet 27 is formed on one side wall of the mixing chamber 24. Yes. A throttle valve 32 is disposed on the outer surface of the intake air inlet 27 with its axis P oriented in a direction perpendicular to the axis O in the longitudinal direction of the mixing chamber 24, and between the throttle valve 32 and the venturi cylinder 31. The intake air that has passed through is configured to flow into the front portion of the end wall 28 in which the EGR gas inlet 29 is disposed.
[0006]
[Problems to be solved by the invention]
However, in the configuration as described above, the intake air that flows between the venturi cylinder 31 and the throttle valve 32 and flows into the mixing chamber 24 from the intake air inlet 27 faces the intake air inlet 27 as indicated by a white arrow. The EGR gas introduced from the EGR gas introduction port 29 into the mixing chamber 24 passes through the space between the wall surface and the central portion of the mixing chamber 24 toward the communication port 26, while the EGR gas introduced into the mixing chamber 24 through the EGR gas inlet port 29 on the side wall of the mixing chamber 24. Along the wall, and the mixing effect of the intake air and EGR gas in the mixing chamber 24 cannot be sufficiently obtained, so that the exhaust gas performance varies widely among the cylinders, and the exhaust gas performance of the entire engine can be improved. There was no problem.
[0007]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an intake manifold that can sufficiently mix EGR gas with intake air and supply it to each cylinder, thereby improving exhaust gas performance. .
[0008]
[Means for Solving the Problems]
The intake manifold of the present invention is an intake manifold having an EGR gas introduction port for introducing EGR gas into intake air, and a collector portion having a plurality of connection ports connected to each cylinder, and a collector portion And a mixing chamber communicated via a communication port, an inlet air inlet and an EGR gas inlet are connected to one end of the mixing chamber in the longitudinal direction, and the other end in the longitudinal direction of the mixing chamber A communication port is provided, and the intake air inlet portion is opened in a longitudinal side wall of the mixing chamber, and a throttle valve is disposed along the longitudinal axis of the mixing chamber at the intake air inlet portion. is, the intake air flows into the mixing chamber from the intake air inlet through the throttle valve is configured to flow toward the communication port becomes a longitudinal central axis of the swirling flow of the mixing chamber, wherein GR gas inlet, characterized in that it is formed so as to open toward the center of the swirling flow. According to the present invention, the intake air passes through the throttle valve whose rotation axis is along the longitudinal direction of the mixing chamber and flows into the mixing chamber from the intake air inlet, so that the intake air is throttled from the intake air inlet. It flows into the mixing chamber with a flow rate difference in a direction perpendicular to the rotational axis of the valve, and as a result, the intake air turns into a swirling flow around the central axis in the longitudinal direction of the mixing chamber, and a negative pressure formed at the center together EGR gas introduced from the EGR gas inlet are mixed is sucked into the area, collide with the intake air EGR gas flowing along the wall surface is also pivoted effectively mixed, thus EGR for each cylinder The gas can be supplied in a sufficiently mixed state with the intake air, the exhaust gas performance of each cylinder can be made uniform, and the exhaust gas performance of the entire engine can be improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
[0011]
In FIG. 1, reference numeral 1 denotes an intake manifold mounted on a four-cylinder engine of an automobile, and four connection ports 3 for each cylinder are formed in parallel on one side of a horizontally long collector portion 2. A mixing chamber 4 having an appropriate length of approximately half to one third of the collector portion 2 is integrally provided from the substantially central portion on the other side of the collector portion 2 toward one end in the longitudinal direction. Of the side walls 5 of the mixing chamber 4, the partition wall portion 5 a that partitions the mixing chamber 4 and the collector portion 2 is provided with a communication port 6 at a substantially central portion of the collector portion 2, and the mixing chamber 4 and the collector portion 2 are connected to each other. They are in communication with each other.
[0012]
An intake air inlet 7 for introducing intake air into the mixing chamber 4 is formed on the upper surface of one end portion away from the communication port 6 of the mixing chamber 4. Further, an EGR gas introduction port 9 for introducing EGR gas is formed in the end wall 8 away from the communication port 6 of the mixing chamber 4, and an EGR gas introduction pipe 10 is integrally formed protruding from the EGR gas introduction port 9. ing.
[0013]
A throttle valve mounting portion 11 is formed at the upper portion of the intake air inlet 7 , and the throttle valve mounting portion 11 has an axis of the EGR gas introduction port 9 in which the axis P of the throttle valve 12 is parallel to the longitudinal direction of the mixing chamber 4. It is configured to be parallel to the core O. Further, the EGR gas introduction port 9 is disposed so as to be displaced downward so as to be located not in the central position of the mixing chamber 4 but in the vicinity of the side wall 5. Specifically, the distance between the axis O of the EGR gas inlet 9 and the side wall 5 is 1.5 times or less, preferably about 1.1 to 1.3 times the radius of the EGR gas inlet 9. It is arranged.
[0014]
Next, the operation of the intake manifold 1 having the above configuration will be described. The intake air flowing into the mixing chamber 4 through the intake air inlet 7 from the throttle valve 12 opened at an arbitrary opening is mixed as shown by the white arrows in FIGS. 1 (a) and 1 (b). After flowing downward along the partition wall portion 5 a of the side wall 5 of the chamber 4, it swirls along the side wall as it is, and flows toward the communication port 6 as a swirling flow around the central axis in the longitudinal direction of the mixing chamber 4. Therefore, a negative pressure region is formed at the center of the swirling flow, and the EGR gas introduced from the EGR gas inlet 9 is sucked and mixed by being swirled into the swirling flow of the intake air, and the side wall of the mixing chamber 4 The EGR gas flowing along the line 5 collides with the swirling intake air and is effectively mixed. Further, since the EGR gas inlet 9 is disposed in the vicinity of the side wall 5 of the mixing chamber 4, the swirling intake air and the EGR gas flowing along the side wall 5 of the mixing chamber 4 collide with each other more reliably and more reliably. Mixed. Thus, the intake air is in a state where the EGR gas is sufficiently mixed in the mixing chamber 4, and the intake air in a state where the EGR gas is uniformly dispersed and mixed flows into the collector portion 2 through the communication port 6.
[0015]
The intake air that has flowed into the substantially central portion of the collector portion 2 and is uniformly mixed with EGR gas is evenly distributed to the respective connection ports 3 by the collector portion 2 and supplied to the corresponding cylinders. Therefore, the intake air can be supplied to each cylinder in a state where the EGR gas is sufficiently mixed, the exhaust gas performance of each cylinder can be made uniform, and the exhaust gas performance of the entire engine can be improved.
[0016]
【The invention's effect】
According to the intake manifold of the present invention, intake air that has flowed into the mixing chamber through the inhalation air inlet becomes the longitudinal central axis of the swirling flow of the mixing chamber, a negative pressure region is formed at the center thereof The EGR gas introduced from the EGR gas inlet is sucked and mixed, and the EGR gas flowing along the wall surface is also effectively mixed by colliding with the swirling intake air, so that the EGR gas is sucked into each cylinder. The exhaust gas performance of each cylinder can be made uniform, and the exhaust gas performance of the entire engine can be improved.
[Brief description of the drawings]
FIG. 1 shows an intake manifold according to an embodiment of the present invention, in which (a) is a partially cross-sectional plan view, and (b) is a cross-sectional side view taken along line AA in (a).
FIGS. 2A and 2B show a conventional intake manifold, in which FIG. 2A is a partial longitudinal sectional view, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intake manifold 2 Collector part 3 Connection port 4 Mixing chamber 5 Side wall 6 Communication port 7 Intake air inlet 9 EGR gas inlet 11 Throttle valve mounting part 12 Throttle valve O EGR gas inlet 9 shaft core P Throttle valve 12 shaft core

Claims

An intake manifold having an EGR gas introduction port for introducing EGR gas into the intake air, wherein the collector unit has a plurality of connection ports connected to each cylinder, and the collector unit is connected via a communication port. and a mixing chamber in communication with said intake air inlet at one end portion in the longitudinal direction and the EGR gas inlet port of the mixing chamber is connected to the communication opening is provided in the other longitudinal end of the mixing chamber, wherein The intake air inlet portion is opened in the side wall in the longitudinal direction of the mixing chamber, and a throttle valve is disposed in the intake air inlet portion with its rotational axis aligned along the longitudinal direction of the mixing chamber. Passing through the intake air inlet and flowing into the mixing chamber, turning into a swirling flow around the central axis in the longitudinal direction of the mixing chamber and flowing toward the communication port, and the EGR gas inlet is In swirl Intake manifold, characterized in that towards the section are formed so as to open.