JP2018021480A - Intake manifold - Google Patents

Intake manifold Download PDF

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Publication number
JP2018021480A
JP2018021480A JP2016151959A JP2016151959A JP2018021480A JP 2018021480 A JP2018021480 A JP 2018021480A JP 2016151959 A JP2016151959 A JP 2016151959A JP 2016151959 A JP2016151959 A JP 2016151959A JP 2018021480 A JP2018021480 A JP 2018021480A
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gas
gas distribution
chamber
auxiliary
intake manifold
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健英 中村
Takehide Nakamura
健英 中村
大悟 大藪
Daigo Oyabu
大悟 大藪
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Aisan Industry Co Ltd
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Aisan Industry Co Ltd
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Priority to JP2016151959A priority Critical patent/JP2018021480A/en
Priority to CN201710574895.3A priority patent/CN107676204B/en
Publication of JP2018021480A publication Critical patent/JP2018021480A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10262—Flow guides, obstructions, deflectors or the like

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce pressure variation in a gas collection chamber and suppress variation in concentration of an auxiliary gas distributed to each branch pipe from a gas distribution part.SOLUTION: An intake manifold 1 comprises a surge tank 2, a plurality of branch pipes 3C, and a gas distribution part 8 for distributing an auxiliary gas. The gas distribution part 8 comprises: a gas introduction pipe for the auxiliary gas; a gas collection chamber 12 for collecting the auxiliary gas from the gas introduction pipe; and a plurality of gas distribution passages 13C branched from the gas collection chamber 12 and connected to the respective branch pipes 3C. Each gas distribution passage 13C forms a gas distribution chamber 14C whose volume is enlarged. A gas introduction hole 15C for the auxiliary gas is provided between each gas distribution chamber 14C and the gas collection chamber 12. Between each gas distribution chamber 14C and each branch pipe 3C, a gas lead-out hole 16C is provided for leading out the auxiliary gas to each branch pipe 3C.SELECTED DRAWING: Figure 2

Description

この発明は、エンジンの各気筒へ吸気を分配するための吸気マニホールドに係り、詳しくは、ＰＣＶガスやＥＧＲガスなどの補助ガスをエンジンの各気筒へ分配するためのガス分配部を備えた吸気マニホールドに関する。   The present invention relates to an intake manifold for distributing intake air to each cylinder of an engine, and more specifically, an intake manifold having a gas distribution portion for distributing auxiliary gas such as PCV gas and EGR gas to each cylinder of the engine. About.

従来、この種の技術として、例えば、下記の特許文献１に記載される吸気装置（吸気マニホールド）が知られている。図１０に、この吸気マニホールド４１の概略構成を正面図により示す。この吸気マニホールド４１は、サージタンク４２と、エンジンの各気筒に対応して設けられた複数の吸気管（分岐管）４３Ａ，４３Ｂ，４３Ｃと、複数の分岐管４３Ａ〜４３Ｃのそれぞれに外部ガス（補助ガス）を分配するためのガス分配部４４とを備える。ガス分配部４４は、補助ガス供給源に接続されるガス導入管４５と、同導入管４５からの補助ガスを集合させるガス集合チャンバ４６と、同集合チャンバ４６から複数に分岐され、各分岐管４３Ａ〜４３Ｃにそれぞれ接続されるガス分配管４７Ａ，４７Ｂ，４７Ｃとを含む。そして、この吸気マニホールド４１は、ガス導入管４５からガス集合チャンバ４６へ導入された補助ガスを、各ガス分配管４７Ａ〜４７Ｃを通じて各分岐管４３Ａ〜４３Ｃへ分配するようになっている。   Conventionally, as this type of technology, for example, an intake device (intake manifold) described in Patent Document 1 below is known. FIG. 10 is a front view showing a schematic configuration of the intake manifold 41. The intake manifold 41 has an external gas (into each of the surge tank 42, a plurality of intake pipes (branch pipes) 43A, 43B, 43C and a plurality of branch pipes 43A to 43C provided corresponding to each cylinder of the engine. Gas distribution unit 44 for distributing auxiliary gas). The gas distribution unit 44 includes a gas introduction pipe 45 connected to an auxiliary gas supply source, a gas collection chamber 46 for collecting auxiliary gas from the introduction pipe 45, and a plurality of branches from the collection chamber 46. Gas distribution pipes 47A, 47B, 47C connected to 43A-43C, respectively. The intake manifold 41 distributes the auxiliary gas introduced from the gas introduction pipe 45 to the gas collecting chamber 46 to the branch pipes 43A to 43C through the gas distribution pipes 47A to 47C.

特開２０１６−０８９６８７号公報JP 2006-089687 A

ところが、特許文献１に記載の吸気マニホールド４１では、ガス分配部４４に関して次のような問題があった。図１１に、ガス分配部４４の概略構成を正断面図により示す。図１１において、例えば、エンジンの複数の気筒のうち、一つの気筒＃１が吸気行程になる場合、その気筒＃１の吸気ポートの負圧が大きくなり、それに伴い、同気筒＃１に対応する分岐管４３Ａに接続されたガス分配管４７Ａの中が負圧となる。すると、他の気筒＃２，＃３に対応するガス分配管４７Ｂ，４７Ｃへ、対応する他の気筒＃２，＃３の吸気ポートから対応する分岐管４３Ｂ，４３Ｃを介して空気が逆流し、ガス集合チャンバ４６へ流れ込む。これにより、ガス集合チャンバ４６では、圧力変動が起き、同集合チャンバ４６における補助ガス濃度分布にバラツキが生じるおそれがある。このように、補助ガス濃度分布が一様でない状態で、各ガス分配管４７Ａ〜４７Ｃから各分岐管４３Ａ〜４３Ｃへ補助ガスが導入されると、複数の気筒＃１〜＃３の間で、導入される補助ガス濃度にバラツキが生じることがある。この結果、エンジンの運転が不安定になるおそれがある。   However, the intake manifold 41 described in Patent Document 1 has the following problems with respect to the gas distribution unit 44. FIG. 11 is a front sectional view showing a schematic configuration of the gas distribution unit 44. In FIG. 11, for example, when one cylinder # 1 is in the intake stroke among a plurality of cylinders of the engine, the negative pressure of the intake port of the cylinder # 1 increases, and accordingly, the cylinder # 1 corresponds to the cylinder # 1. The pressure in the gas distribution pipe 47A connected to the branch pipe 43A is negative. Then, air flows back to the gas distribution pipes 47B and 47C corresponding to the other cylinders # 2 and # 3 from the intake ports of the corresponding other cylinders # 2 and # 3 via the corresponding branch pipes 43B and 43C. It flows into the gas collecting chamber 46. As a result, pressure fluctuations occur in the gas collecting chamber 46, and the auxiliary gas concentration distribution in the collecting chamber 46 may vary. Thus, when auxiliary gas is introduced into each branch pipe 43A-43C from each gas distribution pipe 47A-47C in the state where auxiliary gas concentration distribution is not uniform, between a plurality of cylinders # 1- # 3, There may be variations in the concentration of the auxiliary gas introduced. As a result, the engine operation may become unstable.

この発明は、上記事情に鑑みてなされたものであって、その目的は、ガス集合チャンバにおける圧力変動及び分岐管からの空気の逆流を低減し、ガス分配部から各分岐管へ分配される補助ガス濃度のバラツキを抑えることを可能とした吸気マニホールドを提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce pressure fluctuations in the gas collecting chamber and backflow of air from the branch pipe, and to assist the distribution from the gas distribution section to each branch pipe. An object of the present invention is to provide an intake manifold that can suppress variations in gas concentration.

上記目的を達成するために、請求項１に記載の発明は、サージタンクと、サージタンクから分岐した複数の分岐管と、複数の分岐管のそれぞれに補助ガスを分配するためのガス分配部とを備え、ガス分配部は、補助ガス供給源に接続されたガス導入管と、ガス導入管からの補助ガスを集合させるガス集合チャンバと、ガス集合チャンバから分岐され、各分岐管にそれぞれ接続された複数のガス分配通路とを備えた吸気マニホールドにおいて、複数のガス分配通路のそれぞれに容積を拡大したガス分配チャンバが設けられ、各ガス分配チャンバとガス集合チャンバとの間に各ガス分配チャンバへガス集合チャンバから補助ガスを導入するためのガス導入孔が設けられると共に、各ガス分配チャンバと各分岐管との間に各ガス分配チャンバから各分岐管へ補助ガスを導出するためのガス導出孔が設けられたことを趣旨とする。   To achieve the above object, the invention described in claim 1 includes a surge tank, a plurality of branch pipes branched from the surge tank, and a gas distributor for distributing auxiliary gas to each of the plurality of branch pipes. The gas distribution unit includes a gas introduction pipe connected to an auxiliary gas supply source, a gas collection chamber for collecting auxiliary gas from the gas introduction pipe, and a branch from the gas collection chamber, and is connected to each branch pipe. In the intake manifold having a plurality of gas distribution passages, a gas distribution chamber having an enlarged volume is provided in each of the plurality of gas distribution passages, and each gas distribution chamber is connected to each gas distribution chamber. A gas introduction hole for introducing auxiliary gas from the gas collecting chamber is provided, and each gas distribution chamber is provided between each gas distribution chamber and each branch pipe. And spirit of the gas outlet hole for deriving the auxiliary gas into the branch pipes is provided.

上記発明の構成によれば、ガス分配部を構成する複数のガス分配通路のそれぞれに容積を拡大したガス分配チャンバが設けられ、各ガス分配チャンバとガス集合チャンバとの間にガス導入孔が設けられ、各ガス分配チャンバと各分岐管との間にガス導出孔が設けられる。従って、各分岐管から、対応するガス導出孔に吹き返しにより空気が逆流しても、その空気の逆流がガス分配チャンバで緩和され、ガス導入孔からガス集合チャンバへ作用し難くなる。   According to the configuration of the above invention, the gas distribution chamber having an enlarged volume is provided in each of the plurality of gas distribution passages constituting the gas distribution section, and the gas introduction hole is provided between each gas distribution chamber and the gas collecting chamber. In addition, a gas outlet hole is provided between each gas distribution chamber and each branch pipe. Therefore, even if the air flows backward from each branch pipe to the corresponding gas outlet hole by backflow, the backflow of the air is relaxed in the gas distribution chamber and hardly acts from the gas introduction hole to the gas collecting chamber.

上記目的を達成するために、請求項２に記載の発明は、請求項１に記載の発明において、複数のガス分配通路がガス集合チャンバに対しガス集合チャンバを中心に放射状をなすように接続されると共に、ガス集合チャンバにおける補助ガスの流れとガス集合チャンバから各ガス分配通路へ向かう補助ガスの流れが直交するように複数のガス分配通路がガス集合チャンバに接続されることを趣旨とする。   In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, the plurality of gas distribution passages are connected to the gas collecting chamber so as to form a radial shape around the gas collecting chamber. In addition, a plurality of gas distribution passages are connected to the gas collection chamber so that the flow of the auxiliary gas in the gas collection chamber and the flow of the auxiliary gas from the gas collection chamber to each gas distribution passage are orthogonal to each other.

上記発明の構成によれば、請求項１に記載の発明の作用に加え、補助ガスの流れの慣性力によるバラツキが抑制される。   According to the configuration of the above invention, in addition to the operation of the invention described in claim 1, variation due to the inertial force of the auxiliary gas flow is suppressed.

上記目的を達成するために、請求項３に記載の発明は、請求項１又は２に記載の発明において、各ガス導入孔は、順流のガス流量係数が逆流のガス流量係数より大きくなるように構成されたことを趣旨とする。   To achieve the above object, according to a third aspect of the present invention, in the first or second aspect of the present invention, each gas introduction hole has a forward flow rate gas flow coefficient larger than a reverse flow gas flow coefficient. It is intended that it is configured.

上記発明の構成によれば、請求項１又は２に記載の発明の作用において、各ガス導入孔における順流のガス流量係数が、逆流のガス流量係数より大きく設定されるので、各ガス分配チャンバからガス集合チャンバへ空気が逆流し難くなる。   According to the configuration of the above invention, in the operation of the invention described in claim 1 or 2, the forward flow gas flow coefficient in each gas introduction hole is set larger than the reverse flow gas flow coefficient. Air is less likely to flow back into the gas collection chamber.

上記目的を達成するために、請求項４に記載の発明は、請求項１乃至３のいずれかに記載の発明において、複数のガス分配チャンバを互いに同じ構成とし、複数のガス導入孔を互いに同じ構成とし、複数のガス導出孔を互いに同じ構成としたことを趣旨とする。   In order to achieve the above object, according to a fourth aspect of the present invention, in the first aspect of the present invention, the plurality of gas distribution chambers have the same configuration and the plurality of gas introduction holes have the same configuration. The configuration is such that the plurality of gas outlet holes have the same configuration.

上記発明の構成によれば、請求項１乃至３のいずれかに記載の発明の作用において、複数のガス分配チャンバが互いに同じに構成され、複数のガス導入孔が互いに同じに構成され、複数のガス導出孔が互いに同じに構成される。従って、各ガス分配チャンバからガス集合チャンバに作用する空気の逆流の変動差が小さくなる。   According to the configuration of the invention, in the operation of the invention according to any one of claims 1 to 3, the plurality of gas distribution chambers are configured to be the same as each other, the plurality of gas introduction holes are configured to be the same as each other, The gas outlet holes are configured in the same manner. Therefore, the fluctuation difference in the backflow of air acting from each gas distribution chamber to the gas collecting chamber is reduced.

上記目的を達成するために、請求項５に記載の発明は、請求項１乃至４のいずれかに記載の発明において、各ガス分配チャンバの流路面積が、各ガス導出孔の流路面積の少なくとも９倍に設定されることが好ましい。   In order to achieve the above object, the invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the flow area of each gas distribution chamber is equal to the flow area of each gas outlet hole. It is preferably set at least 9 times.

上記発明の構成によれば、請求項１乃至４のいずれかに記載の発明の作用において、各ガス分配チャンバの流路面積を、各ガス導出孔の流路面積の少なくとも９倍に設定することで、各分岐管から、対応するガス導出孔を介して各ガス分配チャンバに作用する空気の逆流の変動が少なくなる。   According to the configuration of the above invention, in the operation of the invention according to any one of claims 1 to 4, the flow area of each gas distribution chamber is set to at least 9 times the flow area of each gas outlet hole. Thus, the fluctuation of the back flow of air acting on each gas distribution chamber from each branch pipe through the corresponding gas outlet hole is reduced.

請求項１乃至４のいずれかに記載の発明によれば、ガス集合チャンバでの圧力変動及び分岐管からの空気の逆流を低減することができ、ガス分配部から各分岐管へ分配される補助ガス濃度のバラツキを抑えることができる。   According to the invention of any one of claims 1 to 4, the pressure fluctuation in the gas collecting chamber and the back flow of air from the branch pipe can be reduced, and the auxiliary distributed from the gas distributor to each branch pipe. Variations in gas concentration can be suppressed.

請求項５に記載の発明によれば、請求項１乃至４のいずれかに記載の発明の効果に加え、各ガス分配チャンバにおける空気の逆流の変動を低減することができる。   According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, fluctuations in the backflow of air in each gas distribution chamber can be reduced.

第１実施形態に係り、吸気マニホールドの概略構成を示す正面図。The front view which concerns on 1st Embodiment and shows schematic structure of an intake manifold. 第１実施形態に係り、吸気マニホールドの概略構成を示す図１のＡ−Ａ線断面図。FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 illustrating a schematic configuration of an intake manifold according to the first embodiment. 第１実施形態に係り、ガス分配部の概略構成を示す平断面図。FIG. 3 is a cross-sectional plan view illustrating a schematic configuration of a gas distribution unit according to the first embodiment. 第２実施形態に係り、ガス分配部の概略構成を示す平断面図。FIG. 9 is a plan sectional view showing a schematic configuration of a gas distribution unit according to the second embodiment. 第３実施形態に係り、吸気マニホールドの一部を示す斜視図。The perspective view which concerns on 3rd Embodiment and shows a part of intake manifold. 第３実施形態に係り、ガス集合チャンバと３本のガス分配通路との関係を示す側面図。The side view which concerns on 3rd Embodiment and shows the relationship between a gas collection chamber and three gas distribution passages. 第３実施形態に係り、ガス集合チャンバと各ガス分配通路との関係を示す図６のＢ−Ｂ線断面図。The BB sectional drawing of FIG. 6 which concerns on 3rd Embodiment and shows the relationship between a gas collection chamber and each gas distribution channel. 第３実施形態に係り、エンジンの運転状態の違いとＥＧＲ率バラツキの関係を示すグラフ。The graph which shows the relationship between the difference in the driving | running state of an engine, and EGR rate dispersion | variation concerning 3rd Embodiment. 別の実施形態に係り、ガス分配部の概略構成を示す平断面図。FIG. 5 is a plan sectional view showing a schematic configuration of a gas distribution unit according to another embodiment. 従来例に係り、吸気マニホールドの概略構成を正面図により示す。FIG. 2 is a front view illustrating a schematic configuration of an intake manifold according to a conventional example. 従来例に係り、ガス分配部の概略構成を正断面図により示す。1 is a front sectional view of a schematic configuration of a gas distribution unit according to a conventional example.

＜第１実施形態＞
以下、本発明の吸気マニホールドを具体化した第１実施形態につき図面を参照して詳細に説明する。 <First Embodiment>
Hereinafter, a first embodiment in which an intake manifold of the present invention is embodied will be described in detail with reference to the drawings.

図１に、この実施形態の吸気マニホールド１の概略構成を正面図により示す。図２に、同じく吸気マニホールド１の概略構成を図１のＡ−Ａ線断面図により示す。この吸気マニホールド１は、エンジンの複数の気筒に吸気を導入するためにエンジンに装着されて使用される。吸気マニホールド１は、樹脂により形成され、サージタンク２と、そのサージタンク２から分岐した複数の分岐管３Ａ，３Ｂ，３Ｃとを備える。この実施形態で、吸気マニホールド１は、３気筒のエンジンに対応した三つの分岐管３Ａ〜３Ｃを有する。   FIG. 1 is a front view showing a schematic configuration of an intake manifold 1 of this embodiment. FIG. 2 similarly shows a schematic configuration of the intake manifold 1 by a cross-sectional view taken along line AA of FIG. The intake manifold 1 is used by being mounted on an engine in order to introduce intake air into a plurality of cylinders of the engine. The intake manifold 1 is made of resin and includes a surge tank 2 and a plurality of branch pipes 3A, 3B, 3C branched from the surge tank 2. In this embodiment, the intake manifold 1 has three branch pipes 3A to 3C corresponding to a three-cylinder engine.

図１、図２に示すように、サージタンク２には、同タンク２内へ吸気を導入するための吸気導入管４が設けられる。この吸気導入管４の外周には、入口フランジ５が設けられる。この入口フランジ５には、外気が吸気として流れる吸気管が接続される。また、各分岐管３Ａ〜３Ｃの下流端には、エンジンの吸気ポートへ吸気を導出するための吸気導出口６がそれぞれ設けられる。これら吸気導出口６の外周には、出口フランジ７が設けられる。この出口フランジ７は、各吸気ポートに対応してエンジンに接続される。   As shown in FIGS. 1 and 2, the surge tank 2 is provided with an intake air introduction pipe 4 for introducing intake air into the tank 2. An inlet flange 5 is provided on the outer periphery of the intake introduction pipe 4. An intake pipe through which outside air flows as intake air is connected to the inlet flange 5. In addition, an intake outlet 6 for extracting intake air to the intake port of the engine is provided at the downstream end of each of the branch pipes 3A to 3C. Outlet flanges 7 are provided on the outer periphery of these intake outlets 6. The outlet flange 7 is connected to the engine corresponding to each intake port.

図１、図２に示すように、各分岐管３Ａ〜３Ｃの途中には、所定の補助ガスを各分岐管３Ａ〜３Ｃへ分配するためのガス分配部８が設けられる。この実施形態では、補助ガスとして、例えば、エンジンからクランクケースへ漏れ出たブローバイガス（ＰＣＶガス）を想定することができる。あるいは、エンジンから排出された排気の一部であって、エンジンへ還流されるＥＧＲガスを想定することもできる。   As shown in FIGS. 1 and 2, a gas distribution unit 8 is provided in the middle of each branch pipe 3 </ b> A to 3 </ b> C to distribute a predetermined auxiliary gas to each branch pipe 3 </ b> A to 3 </ b> C. In this embodiment, for example, blow-by gas (PCV gas) leaking from the engine to the crankcase can be assumed as the auxiliary gas. Alternatively, EGR gas that is part of the exhaust discharged from the engine and recirculated to the engine can be assumed.

図３に、ガス分配部８の概略構成を平断面図により示す。図１〜図３に示すように、ガス分配部８は、所定の補助ガス供給源に接続されるガス導入管１１と、ガス導入管１１から導入される補助ガスを集合させるガス集合チャンバ１２と、ガス集合チャンバ１２から分岐され、各分岐管３Ａ〜３Ｃにそれぞれ接続される複数のガス分配通路１３Ａ，１３Ｂ，１３Ｃとを備える。この実施形態では、複数のガス分配通路１３Ａ〜１３Ｃのそれぞれ全部が、容積を拡大したガス分配チャンバ１４Ａ，１４Ｂ，１４Ｃとなっている。各ガス分配チャンバ１４Ａ〜１４Ｃとガス集合チャンバ１２との間には、各ガス分配チャンバ１４Ａ〜１４Ｃへガス集合チャンバ１２から補助ガスを導入するためのガス導入孔１５Ａ，１５Ｂ，１５Ｃが設けられる。また、各ガス分配チャンバ１４Ａ〜１４Ｃと各分岐管３Ａ〜３Ｃとの間には、各ガス分配チャンバ１４Ａ〜１４Ｃから各分岐管３Ａ〜３Ｃへ補助ガスを導出するためのガス導出孔１６Ａ，１６Ｂ，１６Ｃが設けられる。   FIG. 3 is a plan view showing a schematic configuration of the gas distribution unit 8. As shown in FIGS. 1 to 3, the gas distribution unit 8 includes a gas introduction pipe 11 connected to a predetermined auxiliary gas supply source, and a gas collection chamber 12 for collecting auxiliary gas introduced from the gas introduction pipe 11. And a plurality of gas distribution passages 13A, 13B, and 13C branched from the gas collecting chamber 12 and connected to the branch pipes 3A to 3C, respectively. In this embodiment, all of the plurality of gas distribution passages 13A to 13C are gas distribution chambers 14A, 14B, and 14C whose volumes are enlarged. Between each gas distribution chamber 14A-14C and the gas collection chamber 12, gas introduction holes 15A, 15B, 15C for introducing auxiliary gas from the gas collection chamber 12 to each gas distribution chamber 14A-14C are provided. Further, between the gas distribution chambers 14A to 14C and the branch pipes 3A to 3C, gas lead-out holes 16A and 16B for leading auxiliary gas from the gas distribution chambers 14A to 14C to the branch pipes 3A to 3C. , 16C are provided.

図２、図３に示すように、各ガス導入孔１５Ａ〜１５Ｃは、順流（図２に矢印Ｆ１で示す方向の流れ）のガス流量係数が、逆流（順流の逆方向の流れ）のガス流量係数より大きくなるように構成される。具体的には、各ガス導入孔１５Ａ〜１５Ｃは、ガス集合チャンバ１２に面する入口１５ａが、ガス集合チャンバ１２へ向けてテーパ状に拡径される。一方、各ガス導入孔１５Ａ〜１５Ｃは、ガス分配チャンバ１４Ａ〜１４Ｃに面する出口１５ｂの周縁に、ガス分配チャンバ１４Ａ〜１４Ｃへ向けて突出するスリーブ１５ｃが形成される。このように構成することで、各ガス導入孔１５Ａ〜１５Ｃは、ガス集合チャンバ１２から入口１５ａへ補助ガスが流れ易く、ガス分配チャンバ１４Ａ〜１４Ｃから出口１５ｂへ補助ガスが流れ難くなっている。   As shown in FIGS. 2 and 3, each gas introduction hole 15 </ b> A to 15 </ b> C has a gas flow rate coefficient of a forward flow (flow in the direction indicated by arrow F <b> 1 in FIG. 2). It is configured to be larger than the coefficient. Specifically, in each of the gas introduction holes 15 </ b> A to 15 </ b> C, the inlet 15 a facing the gas collecting chamber 12 is enlarged in a taper shape toward the gas collecting chamber 12. On the other hand, each of the gas introduction holes 15A to 15C is formed with a sleeve 15c protruding toward the gas distribution chambers 14A to 14C at the periphery of the outlet 15b facing the gas distribution chambers 14A to 14C. With this configuration, the auxiliary gas easily flows from the gas collecting chamber 12 to the inlet 15a through the gas introduction holes 15A to 15C, and the auxiliary gas hardly flows from the gas distribution chambers 14A to 14C to the outlet 15b.

図２、図３に示すように、この実施形態では、複数のガス分配チャンバ１４Ａ〜１４Ｃが互いに同じ構成（形状及び大きさ）に設定される。複数のガス導入孔１５Ａ〜１５Ｃも互いに同じ構成（形状及び大きさ）に設定される。また、複数のガス導出孔１６Ａ〜１６Ｃも互いに同じ構成（形状及び大きさ）に設定される。更に、図３に示すように、各ガス導入孔１５Ａ〜１５Ｃの内径Ｄ１は、各ガス導出孔１６Ａ〜１６Ｃの内径Ｄ２と同じに設定される。加えて、各ガス分配チャンバ１４Ａ〜１４Ｃの流路面積Ｓ１は、各ガス導出孔１６Ａ〜１６Ｃの流路面積Ｓ２の少なくとも９倍に設定される。   As shown in FIGS. 2 and 3, in this embodiment, the plurality of gas distribution chambers 14 </ b> A to 14 </ b> C are set to the same configuration (shape and size). The plurality of gas introduction holes 15A to 15C are also set to the same configuration (shape and size). The plurality of gas outlet holes 16A to 16C are also set to the same configuration (shape and size). Further, as shown in FIG. 3, the inner diameter D1 of each of the gas introduction holes 15A to 15C is set to be the same as the inner diameter D2 of each of the gas outlet holes 16A to 16C. In addition, the flow area S1 of each gas distribution chamber 14A-14C is set to at least 9 times the flow area S2 of each gas outlet hole 16A-16C.

以上説明したこの実施形態の吸気マニホールド１の構成によれば、エンジンに装着された状態で、吸気導入管４からサージタンク２へ導入された吸気が、エンジンの各気筒が吸気行程となるときに、各分岐管３Ａ〜３Ｃへ流れ、対応する各吸気ポートから各気筒へ吸入される。また、ガス分配部８では、ガス導入管１１を介してガス集合チャンバ１２に導入された補助ガスが、各分岐管３Ａ〜３Ｃが負圧になるときに、各ガス分配チャンバ１４Ａ〜１４Ｃを介して各分岐管３Ａ〜３Ｃへ導入され、各分岐管３Ａ〜３Ｃを流れる吸気と共にエンジンの各気筒へ吸入される。   According to the configuration of the intake manifold 1 of this embodiment described above, when the intake air introduced from the intake air intake pipe 4 to the surge tank 2 is attached to the engine, each cylinder of the engine enters the intake stroke. Then, the air flows into the branch pipes 3A to 3C and is sucked into the cylinders from the corresponding intake ports. Further, in the gas distribution unit 8, the auxiliary gas introduced into the gas collecting chamber 12 through the gas introduction pipe 11 passes through the gas distribution chambers 14A to 14C when the branch pipes 3A to 3C have a negative pressure. Are introduced into the branch pipes 3A to 3C, and taken into the cylinders of the engine together with the intake air flowing through the branch pipes 3A to 3C.

ここで、ガス分配部８を構成する複数のガス分配通路１３Ａ〜１３Ｃのそれぞれが、容積を拡大したガス分配チャンバ１４Ａ〜１４Ｃとなっている。また、各ガス分配チャンバ１４Ａ〜１４Ｃとガス集合チャンバ１２との間にガス導入孔１５Ａ〜１５Ｃが設けられ、各ガス分配チャンバ１４Ａ〜１４Ｃと各分岐管３Ａ〜３Ｃとの間にガス導出孔１６Ａ〜１６Ｃが設けられる。従って、各分岐管３Ａ〜３Ｃから、対応するガス導出孔１６Ａ〜１６Ｃに吹き返しにより空気が逆流しても、その空気の逆流がガス分配チャンバ１４Ａ〜１４Ｃで緩和され、ガス導入孔１５Ａ〜１５Ｃからガス集合チャンバ１２へ作用し難くなる。このため、エンジンの吸気脈動によるガス集合チャンバ１２での圧力変動及び各分岐管３Ａ〜３Ｃからの空気の逆流を低減することができ、ガス分配部８から各分岐管３Ａ〜３Ｃへ分配される補助ガス濃度のバラツキを抑えることができる。   Here, each of the plurality of gas distribution passages 13A to 13C constituting the gas distribution unit 8 is a gas distribution chamber 14A to 14C having an enlarged volume. In addition, gas introduction holes 15A to 15C are provided between the gas distribution chambers 14A to 14C and the gas collecting chamber 12, and a gas outlet hole 16A is provided between the gas distribution chambers 14A to 14C and the branch pipes 3A to 3C. ~ 16C are provided. Therefore, even if the air flows back from the branch pipes 3A to 3C to the corresponding gas outlet holes 16A to 16C by backflow, the backflow of the air is relaxed in the gas distribution chambers 14A to 14C, and the gas introduction holes 15A to 15C It becomes difficult to act on the gas collecting chamber 12. For this reason, the pressure fluctuation in the gas collecting chamber 12 due to the intake air pulsation of the engine and the back flow of air from the branch pipes 3A to 3C can be reduced, and the gas is distributed from the gas distributor 8 to the branch pipes 3A to 3C. Variations in the auxiliary gas concentration can be suppressed.

この実施形態の構成によれば、各ガス導入孔１５Ａ〜１５Ｃにおける順流のガス流量係数が、逆流のガス流量係数より大きくなるように設定されるので、各ガス分配チャンバ１４Ａ〜１４Ｃからガス集合チャンバ１２へ空気が逆流し難くなる。この意味でも、エンジンの吸気脈動によるガス集合チャンバ１２での圧力変動及び分岐管３Ａ〜３Ｃからの空気の逆流を低減することができ、ガス分配部８から各分岐管３Ａ〜３Ｃへ分配される補助ガス濃度のバラツキを抑えることができる。   According to the configuration of this embodiment, the gas flow coefficient of the forward flow in each of the gas introduction holes 15A to 15C is set to be larger than the gas flow coefficient of the reverse flow, so that each gas distribution chamber 14A to 14C is connected to the gas collecting chamber. It becomes difficult for air to flow backward to 12. Also in this sense, the pressure fluctuation in the gas collecting chamber 12 due to the intake air pulsation of the engine and the backflow of air from the branch pipes 3A to 3C can be reduced, and the gas is distributed from the gas distributor 8 to the branch pipes 3A to 3C. Variations in the auxiliary gas concentration can be suppressed.

この実施形態の構成によれば、複数のガス分配チャンバ１４Ａ〜１４Ｃが互いに同じ形状及び大きさに構成され、複数のガス導入孔１５Ａ〜１５Ｃが互いに同じ形状及び大きさに構成され、複数のガス導出孔１６Ａ〜１６Ｃが互いに同じ形状及び大きさに構成される。従って、各ガス分配チャンバ１４Ａ〜１４Ｃからガス集合チャンバ１２に作用する空気の逆流の変動差が小さくなる。この意味でも、エンジンの吸気脈動によるガス集合チャンバ１２での圧力変動及び分岐管３Ａ〜３Ｃからの空気の逆流を低減することができ、ガス分配部８から各分岐管３Ａ〜３Ｃへ分配される補助ガス濃度のバラツキを抑えることができる。また、各ガス分配チャンバ１４Ａ〜１４Ｃにおける圧力損失を互いに等しくすることができ、各ガス導出孔１６Ａ〜１６Ｃから各分岐管３Ａ〜３Ｃへ補助ガスを均等に導出することができ、エンジンの各気筒へ補助ガスを均等に分配することができる。   According to the configuration of this embodiment, the plurality of gas distribution chambers 14A to 14C are configured to have the same shape and size, and the plurality of gas introduction holes 15A to 15C are configured to have the same shape and size. The lead-out holes 16A to 16C are configured in the same shape and size. Therefore, the fluctuation difference of the backflow of air acting on the gas collecting chamber 12 from each gas distribution chamber 14A-14C becomes small. Also in this sense, the pressure fluctuation in the gas collecting chamber 12 due to the intake air pulsation of the engine and the backflow of air from the branch pipes 3A to 3C can be reduced, and the gas is distributed from the gas distributor 8 to the branch pipes 3A to 3C. Variations in the auxiliary gas concentration can be suppressed. Further, the pressure losses in the gas distribution chambers 14A to 14C can be made equal to each other, and the auxiliary gas can be evenly led out from the gas outlet holes 16A to 16C to the branch pipes 3A to 3C. Auxiliary gas can be distributed evenly.

この実施形態の構成によれば、各ガス分配チャンバ１４Ａ〜１４Ｃの流路面積Ｓ１を、各ガス導出孔１６Ａ〜１６Ｃの流路面積Ｓ２の少なくとも９倍に設定することで、各分岐管３Ａ〜３Ｃから、対応するガス導出孔１６Ａ〜１６Ｃを介して各分配チャンバ１４Ａ〜１４Ｃに作用する空気の逆流の変動が少なくなる。このため、各ガス分配チャンバ１４Ａ〜１４Ｃにおける空気の逆流の変動を低減することができる。   According to the configuration of this embodiment, the flow passage area S1 of each of the gas distribution chambers 14A to 14C is set to at least nine times the flow passage area S2 of each of the gas outlet holes 16A to 16C, so that each branch pipe 3A to 3A. From 3C, fluctuations in the back flow of air acting on the distribution chambers 14A to 14C via the corresponding gas outlet holes 16A to 16C are reduced. For this reason, the fluctuation | variation of the backflow of the air in each gas distribution chamber 14A-14C can be reduced.

また、この実施形態の構成によれば、ガス分配部８が、吸気マニホールド１と一体的に構成されるので、ガス分配部８等のための配管を別途設ける必要がなく、エンジン周りの構成を簡素化することができる。   Further, according to the configuration of this embodiment, since the gas distribution unit 8 is configured integrally with the intake manifold 1, it is not necessary to separately provide piping for the gas distribution unit 8 and the like, and the configuration around the engine It can be simplified.

＜第２実施形態＞
次に、本発明の吸気マニホールドを具体化した第２実施形態につき図面を参照して詳細に説明する。 Second Embodiment
Next, a second embodiment in which the intake manifold of the present invention is embodied will be described in detail with reference to the drawings.

この実施形態では、ガス分配部８のガス導入孔１５Ａ〜１５Ｃの構成の点で第１実施形態と構成が異なる。図４に、この実施形態のガス分配部の概略構成を平断面図により示す。この実施形態では、スリーブ１５ｃが省略され、各ガス導入孔１５Ａ〜１５Ｃの全体が、ガス集合チャンバ１２へ向けてテーパ状に拡径されるように構成される点で第１実施形態と構成が異なる。この実施形態では、各ガス導入孔１５Ａ〜１５Ｃを上記のように構成することで、順流のガス流量係数が逆流のガス流量係数より大きくなるように設定される。   This embodiment is different from the first embodiment in the configuration of the gas introduction holes 15A to 15C of the gas distribution unit 8. FIG. 4 is a plan sectional view showing a schematic configuration of the gas distribution unit of this embodiment. In this embodiment, the sleeve 15c is omitted, and the configuration of the first embodiment is the same as that of the first embodiment in that each of the gas introduction holes 15A to 15C is configured to expand in a tapered shape toward the gas collecting chamber 12. Different. In this embodiment, by configuring the gas introduction holes 15A to 15C as described above, the gas flow coefficient of the forward flow is set to be larger than the gas flow coefficient of the reverse flow.

従って、この実施形態でも、吸気マニホールドとして、第１実施形態と同等の作用及び効果を得ることができる。   Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained as an intake manifold.

＜第３実施形態＞
次に、本発明の吸気マニホールドを具体化した第３実施形態につき図面を参照して詳細に説明する。 <Third Embodiment>
Next, a third embodiment in which the intake manifold of the present invention is embodied will be described in detail with reference to the drawings.

この実施形態では、特には、ガス分配部８の構成の点で前記各実施形態と構成が異なる。図５に、この実施形態の吸気マニホールド１の一部を斜視図により示す。図６に、ガス集合チャンバ１２と３本のガス分配通路１３Ａ〜１３Ｃとの関係を側面図により示す。図５、図６に示すように、この実施形態のガス集合チャンバ１２は、略Ｌ字形に屈曲した管状をなし、その一端にガス導入管１１が形成され、その他端は端壁１２ａにより閉塞している。この端壁１２ａの近傍にて、３本のガス分配通路１３Ａ〜１３Ｃがガス集合チャンバ１２に対しガス集合チャンバ１２を中心に放射状をなすように接続されると共に、ガス集合チャンバ１２における補助ガスの流れＬ１（図６参照）とガス集合チャンバ１２から各ガス分配通路１３Ａ〜１３Ｃへ向かう補助ガスの流れＬ２（図７参照）が直交するように複数のガス分配通路１３Ａ〜１３Ｃがガス集合チャンバ１２に接続される。この実施形態でも、各ガス分配通路１３Ａ〜１３Ｃのほぼ全部がガス分配チャンバ１４Ａ〜１４Ｃとなっている。図５に示すように、各ガス分配通路１３Ａ〜１３Ｃの他端は、ガス導出孔１６Ａ〜１６Ｃを介して各分岐管３Ａ〜３Ｃに接続される。   In this embodiment, in particular, the configuration differs from the above embodiments in terms of the configuration of the gas distributor 8. FIG. 5 is a perspective view showing a part of the intake manifold 1 of this embodiment. FIG. 6 is a side view showing the relationship between the gas collecting chamber 12 and the three gas distribution passages 13A to 13C. As shown in FIGS. 5 and 6, the gas collecting chamber 12 of this embodiment has a tubular shape bent in an approximately L shape, and a gas introduction pipe 11 is formed at one end thereof, and the other end is closed by an end wall 12a. ing. In the vicinity of the end wall 12 a, three gas distribution passages 13 </ b> A to 13 </ b> C are connected to the gas collecting chamber 12 so as to radiate around the gas collecting chamber 12, and the auxiliary gas in the gas collecting chamber 12 The plurality of gas distribution passages 13A to 13C are formed in the gas collection chamber 12 so that the flow L1 (see FIG. 6) and the auxiliary gas flow L2 (see FIG. 7) from the gas collection chamber 12 to the gas distribution passages 13A to 13C are orthogonal to each other. Connected to. Also in this embodiment, almost all of the gas distribution passages 13A to 13C are gas distribution chambers 14A to 14C. As shown in FIG. 5, the other ends of the gas distribution passages 13A to 13C are connected to the branch pipes 3A to 3C through gas outlet holes 16A to 16C.

図７に、ガス集合チャンバ１２と各ガス分配通路１３Ａ〜１３Ｃとの関係を図６のＢ−Ｂ線断面図により示す。図７に示すように、ガス集合チャンバ１２の端壁１２ａ上には、３つのカットフィン１２ｂが等角度（１２０°）間隔に放射状に配置される。３本のガス分配通路１３Ａ〜１３Ｃは、これらカットフィン１２ｂの間に接続される。ガス集合チャンバ１２と各ガス分配通路１３Ａ〜１３Ｃとの接続部には、それぞれガス導入孔１５Ａ〜１５Ｃが形成される。この実施形態では、ガス導入孔１５Ａ〜１５Ｃの内径が、各ガス分配通路１３Ａ〜１３Ｃの内径よりも小さく形成される。   FIG. 7 shows a relationship between the gas collecting chamber 12 and the gas distribution passages 13A to 13C by a cross-sectional view taken along line BB in FIG. As shown in FIG. 7, on the end wall 12a of the gas collecting chamber 12, three cut fins 12b are arranged radially at equiangular (120 °) intervals. The three gas distribution passages 13A to 13C are connected between the cut fins 12b. Gas introduction holes 15A to 15C are formed in the connecting portions between the gas collecting chamber 12 and the gas distribution passages 13A to 13C, respectively. In this embodiment, the inner diameters of the gas introduction holes 15A to 15C are formed smaller than the inner diameters of the gas distribution passages 13A to 13C.

従って、この実施形態の構成によれば、３本のガス分配通路１３Ａ〜１３Ｃがガス集合チャンバ１２に対しガス集合チャンバ１２を中心に放射状をなすように接続されると共に、ガス集合チャンバ１２における補助ガスの流れＬ１とガス集合チャンバ１２から各ガス分配通路１３Ａ〜１３Ｃへ向かう補助ガスの流れＬ２が直交するように複数のガス分配通路１３Ａ〜１３Ｃがガス集合チャンバ１２に接続される。従って、補助ガスの流れの慣性力によるバラツキが抑制される。このため、ガス集合チャンバ１２における圧力変動及び分岐管３Ａ〜３Ｃからの空気の逆流を低減し、ガス分配部８から各分岐管３Ａ〜３Ｃへ分配される補助ガス濃度のバラツキを抑えることができる。   Therefore, according to the configuration of this embodiment, the three gas distribution passages 13 </ b> A to 13 </ b> C are connected to the gas collecting chamber 12 so as to have a radial shape around the gas collecting chamber 12, and the auxiliary in the gas collecting chamber 12. The gas distribution passages 13A to 13C are connected to the gas collection chamber 12 so that the gas flow L1 and the auxiliary gas flow L2 from the gas collection chamber 12 to the gas distribution passages 13A to 13C are orthogonal to each other. Therefore, variation due to the inertial force of the auxiliary gas flow is suppressed. For this reason, the pressure fluctuation in the gas collecting chamber 12 and the backflow of air from the branch pipes 3A to 3C can be reduced, and variations in the concentration of the auxiliary gas distributed from the gas distributor 8 to the branch pipes 3A to 3C can be suppressed. .

図８に、エンジンの運転状態（エンジン回転速度ＮＥとエンジン負荷ＫＬ）の違いとＥＧＲ率バラツキの関係をグラフにより示す。図８において、白抜きの棒グラフは従来例を示し、斜線付きの棒グラフは本実施形態を示す。図８において、エンジン回転速度ＮＥとエンジン負荷ＫＬの組み合わせは、それぞれ「ＮＥ：１６００ｒｐｍ、ＫＬ：３０％」「ＮＥ：２０００ｒｐｍ、ＫＬ：４０％」「ＮＥ：３６００ｒｐｍ、ＫＬ：６０％」の場合を示す。本実施形態では、いずれの運転状態においても、従来例と比較して、ＥＧＲ率のバラツキが小さくなることがわかる。   FIG. 8 is a graph showing the relationship between the difference in engine operating state (engine rotational speed NE and engine load KL) and EGR rate variation. In FIG. 8, a white bar graph indicates a conventional example, and a shaded bar graph indicates the present embodiment. In FIG. 8, the combinations of the engine speed NE and the engine load KL are “NE: 1600 rpm, KL: 30%”, “NE: 2000 rpm, KL: 40%”, “NE: 3600 rpm, KL: 60%”, respectively. Show. In this embodiment, it can be seen that, in any operating state, the variation in the EGR rate is smaller than in the conventional example.

なお、この発明は前記各実施形態に限定されるものではなく、発明の趣旨を逸脱することのない範囲で構成の一部を適宜変更して実施することもできる。   Note that the present invention is not limited to the above-described embodiments, and a part of the configuration can be changed as appropriate without departing from the spirit of the invention.

（１）前記各実施形態では、各ガス分配通路１３Ａ〜１３Ｃそれぞれの全部を各ガス分配チャンバ１４Ａ〜１４Ｃとしたが、図９に概略構成を平断面図により示すように、各ガス分配通路１３Ａ〜１３Ｃそれぞれの一部に各ガス分配チャンバ１４Ａ〜１４Ｃを設けることもできる。   (1) In each of the above-described embodiments, the gas distribution passages 13A to 13C are all gas distribution chambers 14A to 14C. However, as shown in FIG. Each gas distribution chamber 14A-14C can also be provided in a part of each of -13C.

（２）前記各実施形態では、本発明を３つの分岐管３を備えた吸気マニホールド１に具体化したが、分岐管の数は３つ以外の複数であってもよい。   (2) In each of the above embodiments, the present invention is embodied in the intake manifold 1 including the three branch pipes 3. However, the number of branch pipes may be a plurality other than three.

（３）前記各実施形態では、吸気マニホールド１の詳しい構成について言及しなかったが、吸気マニホールドを複数のピースを接合することで一体に構成することもできる。   (3) Although the detailed configuration of the intake manifold 1 has not been described in each of the above embodiments, the intake manifold can be integrally configured by joining a plurality of pieces.

この発明は、各種タイプのエンジンに対し、その吸気系の構成部品として利用することができる。   The present invention can be used as a component of the intake system for various types of engines.

１ 吸気マニホールド
２ サージタンク
３Ａ 分岐管
３Ｂ 分岐管
３Ｃ 分岐管
８ ガス分配部
１１ ガス導入管
１２ ガス集合チャンバ
１３Ａ ガス分配通路
１３Ｂ ガス分配通路
１３Ｃ ガス分配通路
１４Ａ ガス分配チャンバ
１４Ｂ ガス分配チャンバ
１４Ｃ ガス分配チャンバ
１５Ａ ガス導入孔
１５Ｂ ガス導入孔
１５Ｃ ガス導入孔
１６Ａ ガス導出孔
１６Ｂ ガス導出孔
１６Ｃ ガス導出孔 DESCRIPTION OF SYMBOLS 1 Intake manifold 2 Surge tank 3A Branch pipe 3B Branch pipe 3C Branch pipe 8 Gas distribution part 11 Gas introduction pipe 12 Gas collection chamber 13A Gas distribution path 13B Gas distribution path 13C Gas distribution path 14A Gas distribution chamber 14B Gas distribution chamber 14C Gas distribution Chamber 15A Gas inlet hole 15B Gas inlet hole 15C Gas inlet hole 16A Gas outlet hole 16B Gas outlet hole 16C Gas outlet hole

Claims (5)

サージタンクと、前記サージタンクから分岐した複数の分岐管と、前記複数の分岐管のそれぞれに補助ガスを分配するためのガス分配部とを備え、前記ガス分配部は、補助ガス供給源に接続されたガス導入管と、前記ガス導入管からの補助ガスを集合させるガス集合チャンバと、前記ガス集合チャンバから分岐され、各分岐管にそれぞれ接続された複数のガス分配通路とを備えた吸気マニホールドにおいて、
前記複数のガス分配通路のそれぞれに容積を拡大したガス分配チャンバが設けられ、各ガス分配チャンバと前記ガス集合チャンバとの間に前記各ガス分配チャンバへ前記ガス集合チャンバから補助ガスを導入するためのガス導入孔が設けられると共に、前記各ガス分配チャンバと前記各分岐管との間に前記各ガス分配チャンバから前記各分岐管へ前記補助ガスを導出するためのガス導出孔が設けられたことを特徴とする吸気マニホールド。 A surge tank; a plurality of branch pipes branched from the surge tank; and a gas distribution section for distributing auxiliary gas to each of the plurality of branch pipes, wherein the gas distribution section is connected to an auxiliary gas supply source An intake manifold comprising a gas introduction pipe formed, a gas collection chamber for collecting auxiliary gas from the gas introduction pipe, and a plurality of gas distribution passages branched from the gas collection chamber and connected to the branch pipes, respectively. In
A gas distribution chamber having an enlarged volume is provided in each of the plurality of gas distribution passages, and an auxiliary gas is introduced from the gas collection chamber to each gas distribution chamber between each gas distribution chamber and the gas collection chamber. Gas introduction holes and gas outlet holes for leading the auxiliary gas from the gas distribution chambers to the branch pipes are provided between the gas distribution chambers and the branch pipes. An intake manifold characterized by 前記複数のガス分配通路が前記ガス集合チャンバに対し前記ガス集合チャンバを中心に放射状をなすように接続されると共に、前記ガス集合チャンバにおける前記補助ガスの流れと前記ガス集合チャンバから前記各ガス分配通路へ向かう前記補助ガスの流れが直交するように前記複数のガス分配通路が前記ガス集合チャンバに接続されることを特徴とする請求項１に記載の吸気マニホールド。   The plurality of gas distribution passages are radially connected to the gas collection chamber with the gas collection chamber as a center, and the flow of the auxiliary gas in the gas collection chamber and the gas distribution from the gas collection chamber. 2. The intake manifold according to claim 1, wherein the plurality of gas distribution passages are connected to the gas collecting chamber so that the flow of the auxiliary gas toward the passages is orthogonal. 各ガス導入孔は、順流のガス流量係数が逆流のガス流量係数より大きくなるように構成されたことを特徴とする請求項１又は２に記載の吸気マニホールド。   3. The intake manifold according to claim 1, wherein each gas introduction hole is configured such that a forward flow rate gas flow coefficient is larger than a back flow gas flow rate coefficient. 4. 前記複数のガス分配チャンバを互いに同じ構成とし、前記複数のガス導入孔を互いに同じ構成とし、前記複数のガス導出孔を互いに同じ構成とした
ことを特徴とする請求項１乃至３のいずれかに記載の吸気マニホールド。 4. The gas distribution chamber according to claim 1, wherein the plurality of gas distribution chambers have the same configuration, the plurality of gas introduction holes have the same configuration, and the plurality of gas lead-out holes have the same configuration. The intake manifold described. 前記各ガス分配チャンバの流路面積が、前記各ガス導出孔の流路面積の少なくとも９倍に設定されたことを特徴とする請求項１乃至４のいずれかに記載の吸気マニホールド。   5. The intake manifold according to claim 1, wherein the flow passage area of each gas distribution chamber is set to at least nine times the flow passage area of each gas outlet hole.
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