JP6866197B2

JP6866197B2 - Intake pipe structure

Info

Publication number: JP6866197B2
Application number: JP2017047688A
Authority: JP
Inventors: 嶺介加藤; 慎一萩原; 木ノ下　浩; 浩木ノ下; 健志横尾; 淳坂口
Original assignee: Mazda Motor Corp; Toyota Boshoku Corp
Current assignee: Mazda Motor Corp; Toyota Boshoku Corp
Priority date: 2017-03-13
Filing date: 2017-03-13
Publication date: 2021-04-28
Anticipated expiration: 2037-03-13
Also published as: JP2018150874A

Description

本発明は、吸気管構造に関し、さらに詳しくは、サージタンク内に導入される空気とともに燃料を含むガス又は排気ガスを複数の吸気管に分配してエンジンの吸気側に送る吸気管構造に関する。 The present invention relates to an intake pipe structure, and more particularly to an intake pipe structure that distributes gas containing fuel or exhaust gas together with air introduced into a surge tank to a plurality of intake pipes and sends them to the intake side of the engine.

従来の吸気管構造として、例えば、図８及び図９に示されるように、空気導入口１０２が形成されたサージタンク１０３と、サージタンク１０３の側面部１０３ｂにおいて空気導入口１０２よりも下流側に一端側が接続されてサージタンク１０３内の空気の流れ方向に沿って並設される複数の吸気管１０４ａ〜１０４ｄと、先端側がサージタンク１０３内に突出するように、サージタンク１０３の側面部１０３ｃにおいて空気導入口１０２と最上流側の吸気管１０４ａの一端側との間に接続されてサージタンク１０３内に排気ガス等を導入するガス導入管１０５と、を備える吸気管構造１０１が提案されている。 As a conventional intake pipe structure, for example, as shown in FIGS. 8 and 9, a surge tank 103 in which an air introduction port 102 is formed and a side surface portion 103b of the surge tank 103 located downstream of the air introduction port 102. A plurality of intake pipes 104a to 104d to which one end side is connected and arranged side by side along the air flow direction in the surge tank 103, and a side surface portion 103c of the surge tank 103 so that the tip side protrudes into the surge tank 103. An intake pipe structure 101 including an air introduction pipe 105 connected between an air introduction port 102 and one end side of an intake pipe 104a on the most upstream side to introduce exhaust gas or the like into a surge tank 103 has been proposed. ..

上記吸気管構造１０１では、ガス導入管１０５の先端側の外周壁１０５ａには、サージタンク１０３内の空気の流れ方向の上流側に向かって開口する前側開口部１０７と、サージタンク１０３内の空気の流れ方向の下流側に向かって開口する後側開口部１０８と、が形成されている。そして、サージタンク１０３内に空気導入口１０２から導入される空気は、ガス導入管１０５から導入されるガスとともに各吸気管１０４ａ〜１０４ｄに分配されてエンジンの吸気側に送られる。 In the intake pipe structure 101, the outer peripheral wall 105a on the tip end side of the gas introduction pipe 105 has a front opening 107 that opens toward the upstream side in the air flow direction in the surge tank 103 and air in the surge tank 103. A rear opening 108 that opens toward the downstream side in the flow direction of the air is formed. Then, the air introduced from the air introduction port 102 into the surge tank 103 is distributed to the intake pipes 104a to 104d together with the gas introduced from the gas introduction pipe 105 and sent to the intake side of the engine.

特開平１１−２１０５６２号公報Japanese Unexamined Patent Publication No. 11-210562

しかし、上記従来の吸気管構造１０１では、ガス導入管１０５の先端側の外周壁１０５ａには、サージタンク１０３内の空気の流れ方向の上流側に向かって開口する前側開口部１０７と、サージタンク１０３内の空気の流れ方向の下流側に向かって開口する後側開口部１０８と、が形成されているので、サージタンク１０３内で空気とガスとが混ざり切らず、各吸気管１０４ａ〜１０４ｄにバランス良くガスを分配できない。具体的に、エンジンの高回転時（即ち、サージタンク１０３内を流れる空気の流速が速い時）には、空気の流れによりガスが奥側の吸気管１０４ｃ、１０４ｄに流入され易い。一方、エンジンの低回転時等（即ち、サージタンク１０３内を流れる空気の流速が遅い時）には、ガスの質量が大きいため、ガスが手前側の吸気管１０４ａ、１０４ｂに流入され易い傾向にあった。 However, in the conventional intake pipe structure 101, the outer peripheral wall 105a on the tip end side of the gas introduction pipe 105 has a front opening 107 that opens toward the upstream side in the air flow direction in the surge tank 103 and a surge tank. Since the rear opening 108 that opens toward the downstream side in the air flow direction in the 103 is formed, the air and the gas are not completely mixed in the surge tank 103, and the intake pipes 104a to 104d are filled with each other. The gas cannot be distributed in a well-balanced manner. Specifically, when the engine speed is high (that is, when the flow velocity of the air flowing in the surge tank 103 is high), the gas tends to flow into the intake pipes 104c and 104d on the back side due to the air flow. On the other hand, when the engine speed is low (that is, when the flow velocity of the air flowing in the surge tank 103 is slow), the mass of the gas is large, so that the gas tends to flow into the intake pipes 104a and 104b on the front side. there were.

なお、従来の吸気管構造として、サージタンク内の空気の流れの上流側に指向する第１吹出し口と、下流側に指向する第２吹出し口と、を備えるように、ガス導入部の先端側を分岐管状に形成したものが提案されている（例えば、特許文献１参照）。しかし、特許文献１に記載された技術であっても、上述の吸気管構造１０１と同様にして、エンジンの負荷状態により各吸気管にバランス良くガスを分配できない。 As a conventional intake pipe structure, the tip side of the gas introduction portion is provided with a first outlet directed to the upstream side of the air flow in the surge tank and a second outlet directed to the downstream side. Has been proposed in which the above is formed into a branched tubular shape (see, for example, Patent Document 1). However, even with the technique described in Patent Document 1, gas cannot be distributed to each intake pipe in a well-balanced manner depending on the load state of the engine, similarly to the above-mentioned intake pipe structure 101.

本発明は、上記現状に鑑みてなされたものであり、エンジンの負荷状態に関係なく各吸気管にバランス良くガスを分配できる吸気管構造を提供することを目的とする。 The present invention has been made in view of the above situation, and an object of the present invention is to provide an intake pipe structure capable of distributing gas to each intake pipe in a well-balanced manner regardless of the load state of the engine.

上記問題を解決するために、請求項１に記載の発明は、空気導入口が形成されたサージタンクと、前記サージタンクにおいて前記空気導入口よりも下流側に一端側が接続されて前記サージタンク内の空気の流れ方向に沿って複数並設される吸気管と、先端側が前記サージタンク内に突出するように、前記サージタンクにおいて前記空気導入口と最上流側の前記吸気管の一端側との間に接続されて前記サージタンク内に燃料を含むガス又は排気ガスを導入するガス導入管と、を備える吸気管構造であって、前記サージタンクは、前記吸気管が接続された吸気管側の側面部と、前記吸気管側の側面部と対向する反吸気管側の側面部と、前記吸気管側の側面部と前記反吸気管側の側面部とを連絡し且つ前記ガス導入管が接続された連絡側の側面部と、を備え、前記ガス導入管の先端側の外周壁には、前記サージタンクの前記吸気管側の側面部に向かって開口する吸気管側開口部と、前記サージタンクの前記反吸気管側の側面部に向かって開口する反吸気管側開口部と、が形成されていることを要旨とする。
請求項２に記載の発明は、請求項１記載の発明において、前記ガス導入管の軸心を通り前記吸気管の並び方向に延びる平面で前記ガス導入管の先端側の外周壁を吸気管側領域と反吸気管側領域とに仕切ったときに、前記吸気管側開口部は、前記吸気管側領域に配置されており、前記反吸気管側開口部は、前記反吸気管側領域に配置されていることを要旨とする。
請求項３に記載の発明は、請求項２に記載の発明において、前記吸気管側開口部は、前記ガス導入管の先端側の外周壁の前記吸気管側領域において前記サージタンクの前記吸気管側の側面部に最も近い側に配置されており、前記反吸気管側開口部は、前記ガス導入管の先端側の外周壁の前記反吸気管側領域において前記サージタンクの前記反吸気管側の側面部に最も近い側に配置されていることを要旨とする。
請求項４に記載の発明は、請求項１乃至３のいずれか一項に記載の発明において、前記吸気管側開口部と前記反吸気管側開口部とは、同じ開口面積であることを要旨とする。 In order to solve the above problem, the invention according to claim 1 has a surge tank in which an air introduction port is formed, and one end side of the surge tank connected to the downstream side of the air introduction port in the surge tank. A plurality of intake pipes arranged side by side along the air flow direction of the above, and one end side of the air inlet and the most upstream side of the intake pipe in the surge tank so that the tip side projects into the surge tank. It has an intake pipe structure including a gas introduction pipe connected between them and introducing gas containing fuel or exhaust gas into the surge tank, and the surge tank is on the intake pipe side to which the intake pipe is connected. The side surface portion, the side surface portion on the anti-intake pipe side facing the side surface portion on the intake pipe side, the side surface portion on the intake pipe side and the side surface portion on the anti-intake pipe side are connected, and the gas introduction pipe is connected. On the outer peripheral wall on the tip end side of the gas introduction pipe, there is an intake pipe side opening that opens toward the side surface portion of the surge tank on the intake pipe side, and the surge. It is a gist that an anti-intake pipe side opening that opens toward the side surface portion on the anti-intake pipe side of the tank is formed.
The invention according to claim 2 is the invention according to claim 1, wherein the outer peripheral wall on the tip end side of the gas introduction pipe is on the intake pipe side in a plane extending through the axis of the gas introduction pipe and extending in the alignment direction of the intake pipe. When divided into a region and an anti-intake pipe side region, the intake pipe side opening is arranged in the intake pipe side region, and the anti-intake pipe side opening is arranged in the anti-intake pipe side region. The gist is that it has been done.
The invention according to claim 3 is the invention according to claim 2, wherein the intake pipe side opening is the intake pipe of the surge tank in the intake pipe side region of the outer peripheral wall on the tip end side of the gas introduction pipe. The anti-intake pipe side opening is arranged on the side closest to the side surface portion, and the anti-intake pipe side opening is the anti-intake pipe side of the surge tank in the anti-intake pipe side region of the outer peripheral wall on the tip end side of the gas introduction pipe. The gist is that it is located on the side closest to the side surface of.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the intake pipe side opening and the anti-intake pipe side opening have the same opening area. And.

本発明の吸気管構造によると、サージタンクは、吸気管が接続された吸気管側の側面部と、吸気管側の側面部と対向する反吸気管側の側面部と、吸気管側の側面部と反吸気管側の側面部とを連絡し且つガス導入管が接続された連絡側の側面部と、を備え、ガス導入管の先端側の外周壁には、サージタンクの吸気管側の側面部に向かって開口する吸気管側開口部と、サージタンクの反吸気管側の側面部に向かって開口する反吸気管側開口部と、が形成されている。これにより、反吸気管側開口部からサージタンク内に導入されるガスの多くは、奥側の吸気管に流入され易くなる。また、吸気管側開口部からサージタンク内に導入されるガスの多くは、吸気管の負圧により手前側の吸気管に流入され易くなる。よって、エンジンの負荷状態に関係なく各吸気管にバランス良くガスを分配することができる。
また、前記ガス導入管の軸心を通り前記吸気管の並び方向に延びる平面で前記ガス導入管の先端側の外周壁を吸気管側領域と反吸気管側領域とに仕切ったときに、前記吸気管側開口部が、前記吸気管側領域に配置されており、前記反吸気管側開口部が、前記反吸気管側領域に配置されている場合は、各吸気管に更にバランス良くガスを分配できる。
また、前記吸気管側開口部が、前記ガス導入管の先端側の外周壁の前記吸気管側領域において前記サージタンクの前記吸気管側の側面部に最も近い側に配置されており、前記反吸気管側開口部が、前記ガス導入管の先端側の外周壁の前記反吸気管側領域において前記サージタンクの前記反吸気管側の側面部に最も近い側に配置されている場合は、各吸気管に更にバランス良くガスを分配できる。
さらに、前記吸気管側開口部と前記反吸気管側開口部とが、同じ開口面積である場合は、各吸気管に更にバランス良くガスを分配できる。 According to the intake pipe structure of the present invention, the surge tank has a side surface portion on the intake pipe side to which the intake pipe is connected, a side surface portion on the anti-intake pipe side facing the side surface portion on the intake pipe side, and a side surface on the intake pipe side. It is provided with a side surface portion on the connecting side that connects the portion and the side surface portion on the anti-intake pipe side and is connected to the gas introduction pipe, and the outer peripheral wall on the tip side of the gas introduction pipe is on the intake pipe side of the surge tank. An intake pipe side opening that opens toward the side surface and an anti-intake pipe side opening that opens toward the anti-intake pipe side side surface of the surge tank are formed. As a result, most of the gas introduced into the surge tank from the opening on the anti-intake pipe side tends to flow into the intake pipe on the back side. Further, most of the gas introduced into the surge tank from the opening on the intake pipe side tends to flow into the intake pipe on the front side due to the negative pressure of the intake pipe. Therefore, the gas can be distributed to each intake pipe in a well-balanced manner regardless of the load state of the engine.
Further, when the outer peripheral wall on the tip end side of the gas introduction pipe is divided into an intake pipe side region and an anti-intake pipe side region by a plane extending through the axis of the gas introduction pipe and extending in the arrangement direction of the intake pipes, the above When the intake pipe side opening is arranged in the intake pipe side region and the anti-intake pipe side opening is arranged in the anti-intake pipe side region, gas is further balanced in each intake pipe. Can be distributed.
Further, the intake pipe side opening is arranged on the side closest to the side surface portion of the surge tank on the intake pipe side in the intake pipe side region of the outer peripheral wall on the tip end side of the gas introduction pipe. When the intake pipe side opening is arranged on the side closest to the side surface portion of the surge tank on the anti-intake pipe side in the anti-intake pipe side region of the outer peripheral wall on the tip end side of the gas introduction pipe, each Gas can be distributed to the intake pipe in a more balanced manner.
Further, when the intake pipe side opening and the anti-intake pipe side opening have the same opening area, the gas can be distributed to each intake pipe in a more balanced manner.

本発明について、本発明による典型的な実施形態の非限定的な例を挙げ、言及された複数の図面を参照しつつ以下の詳細な記述にて更に説明するが、同様の参照符号は図面のいくつかの図を通して同様の部品を示す。
実施例に係る吸気管構造の斜視図である。上記吸気管構造においてサージタンクの空気導入口側から見た要部斜視図である。図１のＩＩＩ−ＩＩＩ線断面図である。実施例に係る排気ガス導入管を説明するための説明図であり、（ａ）は平面図を示し、（ｂ）は底面図を示す。上記排気ガス導入管を説明するための説明図であり、（ａ）は図４のａ矢視拡大図を示し、（ｂ）は図４のｂ−ｂ線断面拡大図を示す。他の形態に係る排気ガス導入管を説明するための説明図であり、（ａ）は複数の吸気管側開口部と複数の反吸気管側開口部とを備える形態を示し、（ｂ）は複数の吸気管側開口部を備える形態を示し、（ｃ）は複数の反吸気管側開口部を備える形態を示す。更なる他の形態に係る排気ガス導入管を説明するための説明図であり、（ａ）は反吸気管側開口部よりも開口面積の大きな吸気管側開口部を備える形態を示し、（ｂ）は吸気管側開口部よりも開口面積の大きな反吸気管側開口部を備える形態を示し、（ｃ）は排気ガス導入管の外周壁の空気の流れ方向の下流側に形成される吸気管側及び反吸気管側開口部を備える形態を示す。従来の吸気管構造の要部縦断面図である。上記従来の吸気管構造においてサージタンクの空気導入口側から見た要部斜視図である。 The present invention will be further described in the following detailed description with reference to the plurality of references mentioned with reference to non-limiting examples of typical embodiments according to the invention, but similar reference numerals are in the drawings. Similar parts are shown through several figures.
It is a perspective view of the intake pipe structure which concerns on Example. It is a perspective view of the main part seen from the air introduction port side of the surge tank in the said intake pipe structure. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is explanatory drawing for demonstrating the exhaust gas introduction pipe which concerns on embodiment, (a) shows the plan view, (b) shows the bottom view. It is explanatory drawing for demonstrating the exhaust gas introduction pipe, (a) shows the enlarged view of the arrow view of FIG. 4, and (b) shows the enlarged view of the cross section taken along line bb of FIG. It is explanatory drawing for demonstrating the exhaust gas introduction pipe which concerns on another form, (a) shows the form which includes a plurality of intake pipe side openings and a plurality of anti-intake pipe side openings, (b) is A form having a plurality of intake pipe side openings is shown, and (c) shows a form having a plurality of anti-intake pipe side openings. It is explanatory drawing for demonstrating the exhaust gas introduction pipe which concerns on further another form, (a) shows the form which includes the intake pipe side opening which the opening area is larger than the anti-intake pipe side opening, (b). ) Indicates a form having an anti-intake pipe side opening having a larger opening area than the intake pipe side opening, and (c) shows an intake pipe formed on the downstream side in the air flow direction of the outer peripheral wall of the exhaust gas introduction pipe. A form including a side and an anti-intake pipe side opening is shown. It is a vertical sectional view of a main part of a conventional intake pipe structure. It is a perspective view of the main part seen from the air introduction port side of the surge tank in the said conventional intake pipe structure.

ここで示される事項は例示的なものおよび本発明の実施形態を例示的に説明するためのものであり、本発明の原理と概念的な特徴とを最も有効に且つ難なく理解できる説明であると思われるものを提供する目的で述べたものである。この点で、本発明の根本的な理解のために必要である程度以上に本発明の構造的な詳細を示すことを意図してはおらず、図面と合わせた説明によって本発明の幾つかの形態が実際にどのように具現化されるかを当業者に明らかにするものである。 The matters shown here are for exemplifying and exemplifying embodiments of the present invention, and are considered to be the most effective and effortless explanations for understanding the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this regard, it is not intended to show structural details of the invention beyond a certain degree necessary for a fundamental understanding of the invention, and some embodiments of the invention are provided by description in conjunction with the drawings. It is intended to clarify to those skilled in the art how it is actually realized.

＜吸気管構造＞
本実施形態に係る吸気管構造は、空気導入口（２）が形成されたサージタンク（３）と、サージタンクにおいて空気導入口よりも下流側に一端側が接続されてサージタンク内の空気の流れ方向に沿って複数並設される吸気管（４ａ〜４ｄ）と、先端側がサージタンク内に突出するように、サージタンクにおいて空気導入口（２）と最上流側の吸気管（４ａ）の一端側との間に接続されてサージタンク内に燃料を含むガス又は排気ガスを導入するガス導入管（５）と、を備える吸気管構造（１）である（例えば、図１〜図３等参照）。そして、サージタンク（３）は、吸気管（４ａ〜４ｄ）が接続された吸気管側の側面部（３ｂ）と、吸気管側の側面部と対向する反吸気管側の側面部（３ａ）と、吸気管側の側面部と反吸気管側の側面部とを連絡し且つガス導入管（５）が接続された連絡側の側面部（３ｃ）と、を備え、ガス導入管（５）の先端側の外周壁（５ａ）には、サージタンクの吸気管側の側面部（３ｂ）に向かって開口する吸気管側開口部（７）と、サージタンクの反吸気管側の側面部（３ａ）に向かって開口する反吸気管側開口部（８）と、が形成されている（例えば、図４〜図７等参照）。 <Intake pipe structure>
In the intake pipe structure according to the present embodiment, the surge tank (3) in which the air introduction port (2) is formed and one end side of the surge tank connected to the downstream side of the air introduction port are connected to flow the air in the surge tank. A plurality of intake pipes (4a to 4d) arranged side by side along the direction, and one end of an air inlet (2) and an intake pipe (4a) on the most upstream side in the surge tank so that the tip side protrudes into the surge tank. It is an intake pipe structure (1) including a gas introduction pipe (5) which is connected to the side and introduces gas containing fuel or exhaust gas into a surge tank (see, for example, FIGS. 1 to 3). ). The surge tank (3) has a side surface portion (3b) on the intake pipe side to which the intake pipes (4a to 4d) are connected and a side surface portion (3a) on the anti-intake pipe side facing the side surface portion on the intake pipe side. And a side surface portion (3c) on the connecting side that connects the side surface portion on the intake pipe side and the side surface portion on the anti-intake pipe side and is connected to the gas introduction pipe (5). On the outer peripheral wall (5a) on the tip side of the surge tank, an intake pipe side opening (7) that opens toward the side surface portion (3b) on the intake pipe side of the surge tank and a side surface portion on the anti-intake pipe side of the surge tank ( An anti-intake pipe side opening (8) that opens toward 3a) is formed (see, for example, FIGS. 4 to 7 and the like).

なお、上記「最上流側の吸気管」とは、複数の吸気管のうちの空気導入口に最も近い位置に配置される吸気管を意図する。また、上記サージタンクの形状、材質等は特に問わない。また、上記吸気管の本数、形状、材質等は特に問わない。また、上記ガス導入管の形状、材質、ガス種類等は特に問わない。さらに、上記各開口部の個数、開口量、配置場所等は特に問わない。 The above-mentioned "intake pipe on the most upstream side" is intended to be an intake pipe arranged at a position closest to an air introduction port among a plurality of intake pipes. The shape and material of the surge tank are not particularly limited. The number, shape, material, etc. of the intake pipes are not particularly limited. Further, the shape, material, gas type, etc. of the gas introduction pipe are not particularly limited. Further, the number of the above-mentioned openings, the amount of openings, the place of arrangement, and the like are not particularly limited.

本実施形態に係る吸気管構造としては、例えば、上記ガス導入管（５）の軸心（Ｃ１）を通り吸気管の並び方向（Ｑ）に延びる平面（Ｐ１）でガス導入管の先端側の外周壁（５ａ）を吸気管側領域（Ａ１）と反吸気管側領域（Ａ２）とに仕切ったときに、吸気管側開口部（７）は、吸気管側領域（Ａ１）に配置されており、反吸気管側開口部（８）は、反吸気管側領域（Ａ２）に配置されている形態（例えば、図５〜図７等参照）を挙げることができる。 The intake pipe structure according to the present embodiment is, for example, a plane (P1) extending through the axis (C1) of the gas introduction pipe (5) and extending in the arrangement direction (Q) of the intake pipes on the tip side of the gas introduction pipe. When the outer peripheral wall (5a) is divided into an intake pipe side region (A1) and an anti-intake pipe side region (A2), the intake pipe side opening (7) is arranged in the intake pipe side region (A1). The anti-intake pipe side opening (8) may be arranged in the anti-intake pipe side region (A2) (see, for example, FIGS. 5 to 7).

上述の形態の場合、例えば、上記吸気管側開口部（７）は、ガス導入管（５）の先端側の外周壁（５ａ）の吸気管側領域（Ａ１）においてサージタンクの吸気管側の側面部（３ｂ）に最も近い側に配置されており、反吸気管側開口部（８）は、ガス導入管（５）の先端側の外周壁（５ａ）の反吸気管側領域（Ａ２）においてサージタンクの反吸気管側の側面部（３ａ）に最も近い側に配置されている形態（例えば、図４及び図５等参照）を挙げることができる。 In the case of the above-described embodiment, for example, the intake pipe side opening (7) is located on the intake pipe side of the surge tank in the intake pipe side region (A1) of the outer peripheral wall (5a) on the tip side of the gas introduction pipe (5). It is arranged on the side closest to the side surface portion (3b), and the anti-intake pipe side opening (8) is the anti-intake pipe side region (A2) of the outer peripheral wall (5a) on the tip side of the gas introduction pipe (5). (See, for example, FIGS. 4 and 5), the surge tank is arranged on the side closest to the side surface portion (3a) on the anti-intake pipe side.

本実施形態に係る吸気管構造としては、例えば、上記吸気管側開口部（７）と反吸気管側開口部（８）とは、同じ開口面積（Ｓ）である形態（例えば、図４及び図５等参照）を挙げることができる。なお、上記「同じ開口面積」とは、略同じ開口面積を意図し、各開口部の開口面積が完全に一致する形態の他に、吸気管側開口部と反吸気管側開口部との開口面積の差が吸気管側開口部の開口面積の±５％以内である形態も含むものとする。さらに、上記「開口面積」とは、複数の開口部を備える場合、複数の開口部の合計の開口面積を意図する。 As the intake pipe structure according to the present embodiment, for example, the intake pipe side opening (7) and the anti-intake pipe side opening (8) have the same opening area (S) (for example, FIG. 4 and FIG. (See Fig. 5 etc.). The above "same opening area" is intended to have substantially the same opening area, and in addition to the form in which the opening areas of the respective openings are completely the same, the openings of the intake pipe side opening and the anti-intake pipe side opening are used. It also includes a form in which the difference in area is within ± 5% of the opening area of the opening on the intake pipe side. Further, the above-mentioned "opening area" means the total opening area of the plurality of openings when the plurality of openings are provided.

本実施形態に係る吸気管構造としては、例えば、上記ガス導入管（５）の軸心（Ｃ１）と最上流側の吸気管（４ａ）の一端側の開口の中心（Ｃ２）との吸気管の並び方向（Ｑ）に沿う間隔（Ｌ）は、７５〜１０５ｍｍ（好ましくは８０〜１００ｍｍ、特に８５〜９５ｍｍ）である形態（例えば、図３等参照）を挙げることができる。これにより、各吸気管に更にバランス良くガスを分配できるとともに、サージタンクの小型化が図られる。 The intake pipe structure according to the present embodiment is, for example, an intake pipe between the axis (C1) of the gas introduction pipe (5) and the center (C2) of the opening on one end side of the intake pipe (4a) on the most upstream side. The spacing (L) along the arrangement direction (Q) of the above can be 75 to 105 mm (preferably 80 to 100 mm, particularly 85 to 95 mm) (see, for example, FIG. 3). As a result, the gas can be distributed to each intake pipe in a more balanced manner, and the surge tank can be downsized.

なお、上記実施形態で記載した各構成の括弧内の符号は、後述する実施例に記載の具体的構成との対応関係を示すものである。 The reference numerals in parentheses of each configuration described in the above-described embodiment indicate the correspondence with the specific configurations described in the examples described later.

以下、図面を用いて実施例により本発明を具体的に説明する。なお、本実施例では、本発明に係る「吸気管構造」として、４気筒エンジンで使用される吸気管構造（「インテークマニホールド」とも称される。）を例示する。 Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, the intake pipe structure (also referred to as "intake manifold") used in the 4-cylinder engine is exemplified as the "intake pipe structure" according to the present invention.

（１）吸気管構造の構成
本実施例に係る吸気管構造１は、図１〜図３に示すように、空気導入口２が形成されたサージタンク３と、サージタンク３において空気導入口２よりも下流側に一端側が接続されてサージタンク３内の空気の流れ方向に沿って複数（図中４本）並設される吸気管４ａ〜４ｄと、先端側がサージタンク３内に突出するように、サージタンク３において空気導入口２と最上流側の吸気管４ａの一端側との間に接続されてサージタンク３内に排気ガスを導入する排気ガス導入管５と、を備えている。 (1) Structure of Intake Pipe Structure In the intake pipe structure 1 according to the present embodiment, as shown in FIGS. 1 to 3, a surge tank 3 in which an air introduction port 2 is formed and an air introduction port 2 in the surge tank 3 Intake pipes 4a to 4d, one end of which is connected to the downstream side and are juxtaposed along the air flow direction in the surge tank 3, and the tip side protrudes into the surge tank 3. The surge tank 3 is provided with an exhaust gas introduction pipe 5 which is connected between the air introduction port 2 and one end side of the intake pipe 4a on the most upstream side to introduce the exhaust gas into the surge tank 3.

上記サージタンク３は、各吸気管４ａ〜４ｄが接続された吸気管側の側面部３ｂと、側面部３ｂと対向する反吸気管側の側面部３ｂと、側面部３ａと側面部３ｂとを連絡し且つ排気ガス導入管５が接続された連絡側の側面部３ｃと、を備えている。このサージタンク３は、長尺箱状に形成されており、長尺方向の一端側にサージタンク３内に空気を導入するための空気導入口２が形成されている。そして、サージタンク３内での空気の流れ方向（即ち、吸気管の並び方向Ｑ）は、その一端側の空気導入口２から他端側に向かう方向とされている。なお、上記サージタンク３の側面部３ａと側面部３ｂとの対向方向を上下方向Ｐとする。 The surge tank 3 has a side surface portion 3b on the intake pipe side to which the intake pipes 4a to 4d are connected, a side surface portion 3b on the anti-intake pipe side facing the side surface portion 3b, and a side surface portion 3a and a side surface portion 3b. It is provided with a side surface portion 3c on the contact side which is connected and to which the exhaust gas introduction pipe 5 is connected. The surge tank 3 is formed in a long box shape, and an air introduction port 2 for introducing air into the surge tank 3 is formed on one end side in the long direction. The air flow direction in the surge tank 3 (that is, the arrangement direction Q of the intake pipes) is the direction from the air introduction port 2 on one end side to the other end side. The direction in which the side surface portion 3a and the side surface portion 3b of the surge tank 3 face each other is defined as the vertical direction P.

上記排気ガス導入管５は、図４及び図５に示すように、円筒状の外周壁５ａと、外周壁５ａの先端側に連なり軸端側を閉塞する閉塞壁５ｂと、を備えている。この排気ガス導入管５の先端側の外周壁５ａには、サージタンク３の吸気管側の側面部３ｂに向かって開口する吸気管側開口部７と、サージタンク３の反吸気管側の側面部３ａに向かって開口する反吸気管側開口部８と、が形成されている。 As shown in FIGS. 4 and 5, the exhaust gas introduction pipe 5 includes a cylindrical outer peripheral wall 5a and a closing wall 5b that is connected to the tip end side of the outer peripheral wall 5a and closes the shaft end side. The outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5 has an intake pipe side opening 7 that opens toward the side surface portion 3b of the surge tank 3 on the intake pipe side, and a side surface of the surge tank 3 on the anti-intake pipe side. An anti-intake pipe side opening 8 that opens toward the portion 3a is formed.

ここで、図５に示すように、排気ガス導入管５の軸心Ｃ１を通り吸気管の並び方向Ｑに延びる平面Ｐ１で排気ガス導入管５の先端側の外周壁５ａを吸気管側領域Ａ１と反吸気管側領域Ａ２とに仕切ったときに、吸気管側開口部７は、吸気管側領域Ａ１に配置されており、反吸気管側開口部８は、反吸気管側領域Ａ２に配置されている。この吸気管側領域Ａ１は、サージタンク３の吸気管側の側面部３ｂに向かって凸となる半円筒状に形成されている。また、反吸気管側領域Ａ２は、サージタンク３の反吸気管側の側面部３ａに向かって凸となる半円筒状に形成されている。 Here, as shown in FIG. 5, the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5 is formed on the intake pipe side region A1 on the plane P1 extending through the axial center C1 of the exhaust gas introduction pipe 5 and extending in the arrangement direction Q of the intake pipes. And the anti-intake pipe side region A2, the intake pipe side opening 7 is arranged in the intake pipe side region A1, and the anti-intake pipe side opening 8 is arranged in the anti-intake pipe side region A2. Has been done. The intake pipe side region A1 is formed in a semi-cylindrical shape that is convex toward the side surface portion 3b of the surge tank 3 on the intake pipe side. Further, the anti-intake pipe side region A2 is formed in a semi-cylindrical shape that is convex toward the side surface portion 3a on the anti-intake pipe side of the surge tank 3.

具体的に、上記吸気管側開口部７は、排気ガス導入管５の先端側の外周壁５ａの吸気管側領域Ａ１においてサージタンク３の吸気管側の側面部３ｂに最も近い側に配置されている。言い替えると、吸気管側開口部７は、排気ガス導入管５の先端側の外周壁５ａの吸気管側領域Ａ１において円弧方向の中央側（即ち、頂点側）に配置されている。また、反吸気管側開口部８は、排気ガス導入管５の先端側の外周壁５ａの反吸気管側領域Ａ２においてサージタンク３の反吸気管側の側面部３ａに最も近い側に配置されている。言い替えると、反吸気管側開口部８は、排気ガス導入管５の先端側の外周壁５ａの反吸気管側領域Ａ２において円弧方向の中央側（即ち、頂点側）に配置されている。 Specifically, the intake pipe side opening 7 is arranged on the side closest to the side surface portion 3b of the surge tank 3 on the intake pipe side in the intake pipe side region A1 of the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5. ing. In other words, the intake pipe side opening 7 is arranged on the central side (that is, the apex side) in the arc direction in the intake pipe side region A1 of the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5. Further, the anti-intake pipe side opening 8 is arranged on the side closest to the side surface portion 3a on the anti-intake pipe side of the surge tank 3 in the anti-intake pipe side region A2 of the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5. ing. In other words, the anti-intake pipe side opening 8 is arranged on the central side (that is, the apex side) in the arc direction in the anti-intake pipe side region A2 of the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5.

上記吸気管側開口部７及び反吸気管側開口部８の各開口は、平面略矩形状に形成されている。この吸気管側開口部７と反吸気管側開口部８とは、略同じ開口面積Ｓとされている。さらに、排気ガス導入管５の軸心Ｃ１と最上流側の吸気管４ａの一端側の開口の中心Ｃ２（即ち、開口の吸気管の並び方向Ｑの中心Ｃ２）との吸気管の並び方向Ｑに沿う間隔Ｌは、約９０ｍｍとされている（図３参照）。 Each opening of the intake pipe side opening 7 and the anti-intake pipe side opening 8 is formed in a substantially rectangular shape in a plane. The intake pipe side opening 7 and the anti-intake pipe side opening 8 have substantially the same opening area S. Further, the arrangement direction Q of the intake pipes between the axis C1 of the exhaust gas introduction pipe 5 and the center C2 of the opening on one end side of the intake pipe 4a on the most upstream side (that is, the center C2 of the arrangement direction Q of the intake pipes of the opening). The distance L along the line is about 90 mm (see FIG. 3).

（２）吸気管構造の作用
次に、上記構成の吸気管構造１の作用について説明する。エンジン稼働時には、図３に示すように、空気導入口２からサージタンク３内に導入される空気（仮想線矢印で示す。）とともに、排気ガス導入管５からサージタンク３内に導入される排気ガス（破線矢印で示す。）が各吸気管４ａ〜４ｄに分配されて、エンジンの吸気側へ供給される。このとき、エンジンの低回転時であっても、排気ガス導入管５の反吸気管側開口部８からサージタンク３内に導入される排気ガスの多くは、手前側の吸気管４ａ、４ｂを飛び越すように奥側の吸気管４ｃ、４ｄに流入され易くなる。一方、エンジンの高回転時であっても、排気ガス導入管５の吸気管側開口部７からサージタンク３内に導入される排気ガスの多くは、吸気管の負圧により手前側の吸気管４ａ、４ｂに流入され易くなる。なお、上述のように、排気ガスの一部をエンジンの吸気側に還流することで、排気ガス中の窒素酸化物の低減や燃費向上が図られる。 (2) Action of intake pipe structure Next, the action of the intake pipe structure 1 having the above configuration will be described. When the engine is operating, as shown in FIG. 3, along with the air introduced into the surge tank 3 from the air introduction port 2 (indicated by the virtual line arrow), the exhaust gas introduced into the surge tank 3 from the exhaust gas introduction pipe 5 The gas (indicated by the broken arrow) is distributed to the intake pipes 4a to 4d and supplied to the intake side of the engine. At this time, even when the engine speed is low, most of the exhaust gas introduced into the surge tank 3 from the anti-intake pipe side opening 8 of the exhaust gas introduction pipe 5 passes through the intake pipes 4a and 4b on the front side. It is easy to flow into the intake pipes 4c and 4d on the back side so as to jump over. On the other hand, even when the engine speed is high, most of the exhaust gas introduced into the surge tank 3 from the intake pipe side opening 7 of the exhaust gas introduction pipe 5 is the intake pipe on the front side due to the negative pressure of the intake pipe. It becomes easy to flow into 4a and 4b. As described above, by returning a part of the exhaust gas to the intake side of the engine, nitrogen oxides in the exhaust gas can be reduced and fuel efficiency can be improved.

（３）実施例の効果
本実施例の吸気管構造１によると、サージタンク３は、吸気管４ａ〜４ｄが接続された吸気管側の側面部３ｂと、吸気管側の側面部３ｂと対向する反吸気管側の側面部３ａと、吸気管側の側面部３ｂと反吸気管側の側面部３ａとを連絡し且つガス導入管５が接続された連絡側の側面部３ｃと、を備え、排気ガス導入管５の先端側の外周壁５ａには、サージタンク３の吸気管側の側面部３ｂに向かって開口する吸気管側開口部７と、サージタンク３の反吸気管側の側面部３ａに向かって開口する反吸気管側開口部８と、が形成されている。これにより、反吸気管側開口部８からサージタンク３内に導入される排気ガスの多くは、奥側の吸気管４ｃ、４ｄに流入され易くなる。また、吸気管側開口部７からサージタンク３内に導入される排気ガスの多くは、吸気管の負圧により手前側の吸気管４ａ、４ｂに流入され易くなる。よって、エンジンの負荷状態に関係なく各吸気管４ａ〜４ｄにバランス良く排気ガスを分配することができる。 (3) Effect of Example According to the intake pipe structure 1 of this embodiment, the surge tank 3 faces the side surface portion 3b on the intake pipe side to which the intake pipes 4a to 4d are connected and the side surface portion 3b on the intake pipe side. A side surface portion 3a on the anti-intake pipe side, a side surface portion 3b on the intake pipe side and a side surface portion 3a on the anti-intake pipe side, and a side surface portion 3c on the connecting side to which the gas introduction pipe 5 is connected are provided. On the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5, there is an intake pipe side opening 7 that opens toward the side surface portion 3b of the surge tank 3 on the intake pipe side, and a side surface of the surge tank 3 on the anti-intake pipe side. An anti-intake pipe side opening 8 that opens toward the portion 3a is formed. As a result, most of the exhaust gas introduced into the surge tank 3 from the anti-intake pipe side opening 8 is likely to flow into the intake pipes 4c and 4d on the back side. Further, most of the exhaust gas introduced into the surge tank 3 from the intake pipe side opening 7 tends to flow into the intake pipes 4a and 4b on the front side due to the negative pressure of the intake pipe. Therefore, the exhaust gas can be distributed to the intake pipes 4a to 4d in a well-balanced manner regardless of the load state of the engine.

また、本実施例では、排気ガス導入管５の軸心Ｃ１を通り吸気管の並び方向Ｑに延びる平面Ｐ１で排気ガス導入管５の先端側の外周壁５ａを吸気管側領域Ａ１と反吸気管側領域Ａ２とに仕切ったときに、吸気管側開口部７は、吸気管側領域Ａ１に配置されており、反吸気管側開口部８は、反吸気管側領域Ａ２に配置されている。これにより、各吸気管４ａ〜４ｄに更にバランス良くガスを分配できる。 Further, in this embodiment, the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5 is counter-intake with the intake pipe side region A1 on the plane P1 extending through the axis C1 of the exhaust gas introduction pipe 5 and extending in the arrangement direction Q of the intake pipes. When partitioned from the pipe side region A2, the intake pipe side opening 7 is arranged in the intake pipe side region A1, and the anti-intake pipe side opening 8 is arranged in the anti-intake pipe side region A2. .. As a result, the gas can be distributed to the intake pipes 4a to 4d in a more balanced manner.

また、本実施例では、吸気管側開口部７は、排気ガス導入管５の先端側の外周壁５ａの吸気管側領域Ａ１においてサージタンク３の吸気管側の側面部３ｂに最も近い側に配置されており、反吸気管側開口部８は、排気ガス導入管５の先端側の外周壁５ａの反吸気管側領域Ａ２においてサージタンク３の反吸気管側の側面部３ａに最も近い側に配置されている。これにより、各吸気管４ａ〜４ｄに更にバランス良くガスを分配できる。 Further, in the present embodiment, the intake pipe side opening 7 is located on the side closest to the side surface portion 3b of the surge tank 3 on the intake pipe side in the intake pipe side region A1 of the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5. The anti-intake pipe side opening 8 is arranged so that the anti-intake pipe side region A2 of the outer peripheral wall 5a on the tip end side of the exhaust gas introduction pipe 5 is closest to the side surface portion 3a on the anti-intake pipe side of the surge tank 3. Is located in. As a result, the gas can be distributed to the intake pipes 4a to 4d in a more balanced manner.

また、本実施例では、吸気管側開口部７と反吸気管側開口部８とは、同じ開口面積である。これにより、各吸気管４ａ〜４ｄに更にバランス良くガスを分配できる。 Further, in this embodiment, the intake pipe side opening 7 and the anti-intake pipe side opening 8 have the same opening area. As a result, the gas can be distributed to the intake pipes 4a to 4d in a more balanced manner.

さらに、本実施例では、排気ガス導入管５の軸心Ｃ１と最上流側の吸気管４ａの一端側の開口の中心Ｃ２との吸気管の並び方向Ｑに沿う間隔Ｌは、９０ｍｍである。これにより、各吸気管４ａ〜４ｄに更にバランス良くガスを分配できるとともに、サージタンク３の小型化が図られる。 Further, in this embodiment, the distance L between the axis C1 of the exhaust gas introduction pipe 5 and the center C2 of the opening on one end side of the intake pipe 4a on the most upstream side along the arrangement direction Q of the intake pipes is 90 mm. As a result, the gas can be distributed to the intake pipes 4a to 4d in a more balanced manner, and the surge tank 3 can be downsized.

ここで、コンピュータを用いたシミュレーションにおいて、第１の解析として、各開口部７、８の開口面積の影響による各吸気管４ａ〜４ｄへの排気ガスの分配状態を解析した。さらに、第２の解析として、間隔Ｌ（図３参照）の影響による各吸気管４ａ〜４ｄへの排気ガスの分配状態を解析した。 Here, in the simulation using a computer, as the first analysis, the distribution state of the exhaust gas to the intake pipes 4a to 4d due to the influence of the opening areas of the openings 7 and 8 was analyzed. Further, as a second analysis, the distribution state of the exhaust gas to the intake pipes 4a to 4d due to the influence of the interval L (see FIG. 3) was analyzed.

第１の解析では、各開口部７、８が同じ開口面積ＳであるＡ１形態、吸気管側開口部７が反吸気管側開口部８に比べて約１０％開口面積が大きいＡ２形態（図７（ａ）参照）、及び反吸気管側開口部８が吸気管側開口部７に比べて約１０％開口面積が大きいＡ３形態（図７（ｂ）参照）において、エンジンの低回転時（１５００ｒｐｍ）及びエンジンの高回転時（５０００ｒｐｍ）のそれぞれで比較検討した。その結果、エンジンの低回転時では、Ａ１〜Ａ３形態において、各吸気管４ａ〜４ｄへの排気ガスの分配の顕著なバラツキは見られなかった。これに対して、エンジンの高回転時では、Ａ１形態での各吸気管４ａ〜４ｄへの排気ガスの分配のバラツキが少ないが、Ａ２形態では、手前側の吸気管４ａ、４ｂへの排気ガスの分配がやや多くなり、Ａ３形態では、奥側の吸気管４ｃ、４ｄへの排気ガスの分配がやや多くなった。 In the first analysis, the A1 form in which the openings 7 and 8 have the same opening area S, and the A2 form in which the intake pipe side opening 7 has an opening area approximately 10% larger than that of the anti-intake pipe side opening 8 (FIG. 7 (a)) and in the A3 form (see FIG. 7 (b)) in which the anti-intake pipe side opening 8 has an opening area approximately 10% larger than that of the intake pipe side opening 7, when the engine speed is low (see FIG. 7 (b)). A comparative study was conducted at 1500 rpm) and at high engine speed (5000 rpm). As a result, when the engine speed was low, no significant variation in the distribution of the exhaust gas to the intake pipes 4a to 4d was observed in the A1 to A3 forms. On the other hand, when the engine speed is high, there is little variation in the distribution of the exhaust gas to the intake pipes 4a to 4d in the A1 form, but in the A2 form, the exhaust gas to the intake pipes 4a and 4b on the front side is small. In the A3 form, the distribution of the exhaust gas to the intake pipes 4c and 4d on the back side was slightly increased.

第２の解析では、サージタンク３に対する排気ガス導入口５の吸気管の並び方向Ｑの接続位置を変更することで、間隔Ｌが６０ｍｍであるＢ１形態、間隔Ｌが７０ｍｍであるＢ２形態、間隔Ｌが８０ｍｍであるＢ３形態、及び間隔Ｌが９０ｍｍであるＢ４形態において、エンジンの低回転時（１５００ｒｐｍ）及びエンジンの高回転時（５０００ｒｐｍ）のそれぞれで比較検討した。その結果、エンジンの高回転時では、Ｂ１〜Ｂ４形態において、各吸気管４ａ〜４ｄへの排気ガスの分配の顕著なバラツキは見られなかった。これに対して、エンジンの低回転時では、間隔Ｌが大きくなるにつれて各吸気管４ａ〜４ｄへの排気ガスの分配のバラツキが少なくなった。 In the second analysis, by changing the connection position of the intake pipes of the exhaust gas introduction port 5 with respect to the surge tank 3 in the arrangement direction Q, the B1 form in which the interval L is 60 mm, the B2 form in which the interval L is 70 mm, and the interval In the B3 form in which L is 80 mm and the B4 form in which the interval L is 90 mm, a comparative study was carried out at low engine speeds (1500 rpm) and at high engine speeds (5000 rpm). As a result, when the engine speed was high, no significant variation in the distribution of the exhaust gas to the intake pipes 4a to 4d was observed in the B1 to B4 forms. On the other hand, at low engine speeds, the variation in the distribution of exhaust gas to the intake pipes 4a to 4d decreased as the interval L increased.

尚、本発明においては、上記実施例に限られず、目的、用途に応じて本発明の範囲内で種々変更した実施例とすることができる。すなわち、上記実施例では、１つの吸気管側開口部７及び１つの反吸気管側開口部８を備えるガス導入管５を例示したが、これに限定されず、例えば、例えば、図６（ａ）（ｂ）に示すように、複数の吸気管側開口部７を備えるガス導入管５としてもよい。また、例えば、図６（ａ）（ｃ）に示すように、複数の反吸気管側開口部８を備えるガス導入管５としてもよい。 It should be noted that the present invention is not limited to the above-mentioned examples, and various modifications can be made within the scope of the present invention according to the purpose and application. That is, in the above embodiment, the gas introduction pipe 5 provided with one intake pipe side opening 7 and one anti-intake pipe side opening 8 is illustrated, but the present invention is not limited to this, and for example, FIG. 6 (a). ) (B), the gas introduction pipe 5 having a plurality of intake pipe side openings 7 may be used. Further, for example, as shown in FIGS. 6A and 6C, the gas introduction pipe 5 having a plurality of anti-intake pipe side openings 8 may be used.

また、上記実施例では、ガス導入管５の先端側の外周壁５ａの吸気管側領域Ａ１（又は反吸気管側領域Ａ２）においてサージタンク３の吸気管側の側面部３ｂ（又は反吸気管側の側面部３ａ）に最も近い側に配置される吸気管側開口部７（又は反吸気管側開口部８）を例示したが、これに限定されず、例えば、図６（ａ）（ｂ）及び図７（ｃ）に示すように、ガス導入管５の先端側の外周壁５ａの吸気管側領域Ａ１において側面部３ｂに最も近い部位から離れた場所に配置される吸気管側開口部７としてもよい。また、例えば、図６（ａ）（ｃ）及び図７（ｃ）に示すように、ガス導入管５の先端側の外周壁５ａの反吸気管側領域Ａ２において側面部３ａに最も近い部位から離れた場所に配置される反吸気管側開口部８としてもよい。 Further, in the above embodiment, in the intake pipe side region A1 (or anti-intake pipe side region A2) of the outer peripheral wall 5a on the tip side of the gas introduction pipe 5, the side surface portion 3b (or anti-intake pipe) of the surge tank 3 on the intake pipe side. An intake pipe side opening 7 (or an anti-intake pipe side opening 8) arranged on the side closest to the side surface portion 3a) has been illustrated, but the present invention is not limited to this, and for example, FIGS. ) And FIG. 7 (c), the intake pipe side opening arranged at a position away from the portion closest to the side surface portion 3b in the intake pipe side region A1 of the outer peripheral wall 5a on the tip side of the gas introduction pipe 5. It may be 7. Further, for example, as shown in FIGS. 6 (a) and 6 (c) and 7 (c), from the portion closest to the side surface portion 3a in the anti-intake pipe side region A2 of the outer peripheral wall 5a on the distal end side of the gas introduction pipe 5. The anti-intake pipe side opening 8 may be arranged at a distant place.

また、上記実施例では、同じ開口面積Ｓの開口部７、８を例示したが、これに限定されず、例えば、図７（ａ）（ｂ）に示すように、異なる開口面積の開口部７、８としてもよい。なお、図６及び図７では、開口部７、８の軸心方向の長さを同じものとする。 Further, in the above embodiment, the openings 7 and 8 having the same opening area S have been illustrated, but the present invention is not limited to this, and for example, as shown in FIGS. , 8 may be used. In FIGS. 6 and 7, the lengths of the openings 7 and 8 in the axial direction are the same.

また、上記実施例では、ガス導入管５の外周壁５ａのみに形成される開口部７、８を例示したが、これに限定されず、例えば、ガス導入管５の外周壁５ａ及び閉塞壁５ｂにわたって形成される開口部としてもよい。 Further, in the above embodiment, the openings 7 and 8 formed only in the outer peripheral wall 5a of the gas introduction pipe 5 are illustrated, but the present invention is not limited to this, and for example, the outer peripheral wall 5a and the closing wall 5b of the gas introduction pipe 5 are illustrated. It may be an opening formed over.

また、上記実施例では、平面略矩形状の開口を有する開口部７、８を例示したが、これに限定されず、例えば、平面略円形、略楕円形、異形等の開口を有する開口部としてもよい。 Further, in the above embodiment, the openings 7 and 8 having an opening having a substantially rectangular plane shape are illustrated, but the present invention is not limited to this, and for example, as an opening having an opening having a substantially circular plane shape, a substantially elliptical shape, a deformed shape, or the like. May be good.

また、上記実施例では、角筒状のサージタンク３を例示したが、これに限定されず、例えば、円筒状や楕円筒状のサージタンクとしてもよい。 Further, in the above embodiment, the square tubular surge tank 3 has been illustrated, but the present invention is not limited to this, and for example, a cylindrical or elliptical tubular surge tank may be used.

さらに、上記実施例では、サージタンク３内に排気ガスを導入する排気ガス導入管５を例示したが、これに限定されず、例えば、サージタンク３内にブローバイガス（即ち、燃料を含むガス）を導入するガス導入管としたり、サージタンク３内に燃料蒸気（即ち、燃料を含むガス）を導入するガス導入管としたりしてもよい。さらに、上記実施例では、１つのガス導入管５を備える形態を例示したが、これに限定されず、例えば、複数のガス導入管を備えるようにしてもよい。 Further, in the above embodiment, the exhaust gas introduction pipe 5 for introducing the exhaust gas into the surge tank 3 has been illustrated, but the present invention is not limited to this, and for example, blow-by gas (that is, gas containing fuel) in the surge tank 3). It may be a gas introduction pipe for introducing fuel, or a gas introduction pipe for introducing fuel vapor (that is, a gas containing fuel) into the surge tank 3. Further, in the above embodiment, the embodiment including one gas introduction pipe 5 is illustrated, but the present invention is not limited to this, and for example, a plurality of gas introduction pipes may be provided.

さらに、上記実施例では、円筒状の外周壁５ａを有するガス導入管５を例示したが、これに限定されず、例えば、角筒状や楕円筒状の外周壁を有するガス導入管としてもよい。 Further, in the above embodiment, the gas introduction pipe 5 having a cylindrical outer peripheral wall 5a has been illustrated, but the present invention is not limited to this, and for example, a gas introduction pipe having a square tubular or elliptical outer peripheral wall may be used. ..

前述の例は単に説明を目的とするものでしかなく、本発明を限定するものと解釈されるものではない。本発明を典型的な実施形態の例を挙げて説明したが、本発明の記述および図示において使用された文言は、限定的な文言ではなく説明的および例示的なものであると理解される。ここで詳述したように、その形態において本発明の範囲または精神から逸脱することなく、添付の特許請求の範囲内で変更が可能である。ここでは、本発明の詳述に特定の構造、材料および実施例を参照したが、本発明をここにおける開示事項に限定することを意図するものではなく、むしろ、本発明は添付の特許請求の範囲内における、機能的に同等の構造、方法、使用の全てに及ぶものとする。 The above examples are for illustration purposes only and are not to be construed as limiting the invention. Although the present invention has been described with reference to typical embodiments, the language used in the description and illustration of the invention is understood to be descriptive and exemplary rather than restrictive. As described in detail here, modifications can be made within the scope of the appended claims without departing from the scope or spirit of the invention in that form. Although specific structures, materials and examples have been referred to herein in detail of the invention, it is not intended to limit the invention to the disclosures herein, but rather the invention is claimed in the accompanying claims. It shall cover all functionally equivalent structures, methods and uses within the scope.

本発明は上記で詳述した実施形態に限定されず、本発明の請求項に示した範囲で様々な変形または変更が可能である。 The present invention is not limited to the embodiments detailed above, and various modifications or modifications can be made within the scope of the claims of the present invention.

本発明は、乗用車、バス、トラック等の車両などで使用されるエンジンの吸気側に空気とともに燃料を含むガス又は排気ガスを導くための吸気管構造に関する技術として広く利用される。 The present invention is widely used as a technique relating to an intake pipe structure for guiding a gas containing fuel together with air or an exhaust gas to the intake side of an engine used in a vehicle such as a passenger car, a bus, or a truck.

１；吸気管構造、２；空気導入口、３；サージタンク、３ａ；反吸気管側の側面部、３ｂ；吸気管側の側面部、３ｃ；側面部、４ａ〜４ｄ；吸気管、５；排気ガス導入管（ガス導入管）、５ａ；外周壁、７；吸気管側開口部、８；反吸気管側開口部、Ａ１；吸気管側領域、Ａ２；反吸気管側領域、Ｃ１；排気ガス導入管の軸心、Ｃ２；最上流側の吸気管の中心、Ｐ１；平面、Ｑ；吸気管の並び方向、Ｓ；開口部の開口面積。 1; intake pipe structure, 2; air inlet, 3; surge tank, 3a; side surface portion on the anti-intake pipe side, 3b; side surface portion on the intake pipe side, 3c; side surface portion, 4a to 4d; intake pipe, 5; Exhaust gas introduction pipe (gas introduction pipe), 5a; outer wall, 7; intake pipe side opening, 8; anti-intake pipe side opening, A1; intake pipe side region, A2; anti-intake pipe side region, C1; exhaust Axial center of gas introduction pipe, C2; center of intake pipe on the most upstream side, P1; plane, Q; direction of arrangement of intake pipes, S; opening area of opening.

Claims

空気導入口が形成された長尺状のサージタンクと、前記サージタンクにおいて前記空気導入口よりも下流側に一端側が接続されて前記サージタンク内の空気の流れ方向に沿って複数並設される吸気管と、先端側が前記サージタンク内に突出するように、前記サージタンクにおいて前記空気導入口と最上流側の前記吸気管の一端側との間に接続されて前記サージタンク内に燃料を含むガス又は排気ガスを導入するガス導入管と、を備え、前記空気導入口は、前記サージタンクの長尺方向に開口している吸気管構造であって、
前記サージタンクは、前記吸気管が接続された吸気管側の側面部と、前記吸気管側の側面部と対向する反吸気管側の側面部と、前記吸気管側の側面部と前記反吸気管側の側面部とを連絡し且つ前記ガス導入管が接続された連絡側の側面部と、を備え、
前記ガス導入管の先端側の外周壁には、前記サージタンクの前記吸気管側の側面部に向かって下向きに開口する吸気管側開口部と、前記サージタンクの前記反吸気管側の側面部に向かって上向きに開口する反吸気管側開口部と、が形成されており、
前記サージタンクに対する前記ガス導入管の接続位置は、前記吸気管の並び方向（Ｑ）において最上流側の前記吸気管の一端側よりも上流側に配置されていることを特徴とする吸気管構造。 A long surge tank in which an air introduction port is formed and one end side of the surge tank connected to the downstream side of the air introduction port are arranged side by side along the air flow direction in the surge tank. The intake pipe is connected between the air inlet and one end side of the intake pipe on the most upstream side in the surge tank so that the tip side projects into the surge tank, and the surge tank contains fuel. A gas introduction pipe for introducing gas or exhaust gas is provided, and the air introduction port has an intake pipe structure that opens in the elongated direction of the surge tank.
The surge tank includes a side surface portion on the intake pipe side to which the intake pipe is connected, a side surface portion on the anti-intake pipe side facing the side surface portion on the intake pipe side, a side surface portion on the intake pipe side, and the anti-intake. It is provided with a side surface portion on the connecting side that communicates with the side surface portion on the pipe side and is connected to the gas introduction pipe.
On the outer peripheral wall on the tip end side of the gas introduction pipe, an intake pipe side opening that opens downward toward the side surface portion of the surge tank on the intake pipe side and a side surface portion of the surge tank on the anti-intake pipe side. An anti-intake pipe side opening that opens upward toward the air intake pipe is formed.
The intake pipe structure is characterized in that the connection position of the gas introduction pipe to the surge tank is arranged on the upstream side of one end side of the intake pipe on the most upstream side in the arrangement direction (Q) of the intake pipes. ..

前記ガス導入管の軸心（Ｃ１）と最上流側の前記吸気管の一端側の開口の中心（Ｃ２）との前記吸気管の並び方向（Ｑ）に沿う間隔（Ｌ）は７５〜１０５ｍｍである請求項１に記載の吸気管構造。 The distance (L) between the axis (C1) of the gas introduction pipe and the center (C2) of the opening on one end side of the intake pipe on the most upstream side along the arrangement direction (Q) of the intake pipe is 75 to 105 mm. The intake pipe structure according to claim 1.

前記ガス導入管の軸心を通り前記吸気管の並び方向に延びる平面で前記ガス導入管の先端側の外周壁を吸気管側領域と反吸気管側領域とに仕切ったときに、前記吸気管側開口部は、前記吸気管側領域に配置されており、前記反吸気管側開口部は、前記反吸気管側領域に配置されている請求項１又は２に記載の吸気管構造。 When the outer peripheral wall on the tip end side of the gas introduction pipe is divided into an intake pipe side region and an anti-intake pipe side region by a plane extending through the axis of the gas introduction pipe and extending in the arrangement direction of the intake pipes, the intake pipe The intake pipe structure according to claim 1 or 2, wherein the side opening is arranged in the intake pipe side region, and the anti-intake pipe side opening is arranged in the anti-intake pipe side region.

前記吸気管側開口部は、前記ガス導入管の先端側の外周壁の前記吸気管側領域において前記サージタンクの前記吸気管側の側面部に最も近い側に配置されており、
前記反吸気管側開口部は、前記ガス導入管の先端側の外周壁の前記反吸気管側領域において前記サージタンクの前記反吸気管側の側面部に最も近い側に配置されている請求項３に記載の吸気管構造。 The intake pipe side opening is arranged on the side closest to the side surface portion of the surge tank on the intake pipe side in the intake pipe side region of the outer peripheral wall on the tip end side of the gas introduction pipe.
The claim that the anti-intake pipe side opening is arranged on the side closest to the side surface portion of the surge tank on the anti-intake pipe side in the anti-intake pipe side region of the outer peripheral wall on the tip end side of the gas introduction pipe. The intake pipe structure according to 3.

前記吸気管側開口部と前記反吸気管側開口部とは、同じ開口面積である請求項１乃至４のいずれか一項に記載の吸気管構造。 The intake pipe structure according to any one of claims 1 to 4, wherein the intake pipe side opening and the anti-intake pipe side opening have the same opening area.