JP4646714B2 - Engine intake system - Google Patents

Engine intake system Download PDF

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JP4646714B2
JP4646714B2 JP2005200805A JP2005200805A JP4646714B2 JP 4646714 B2 JP4646714 B2 JP 4646714B2 JP 2005200805 A JP2005200805 A JP 2005200805A JP 2005200805 A JP2005200805 A JP 2005200805A JP 4646714 B2 JP4646714 B2 JP 4646714B2
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gas
gas introduction
introduction passage
surge tank
discharge port
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JP2007016728A (en
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竜蔵 橋本
智志 榎田
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Daikyo Nishikawa Corp
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Daikyo Nishikawa Corp
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Description

この発明は、エンジンの吸気装置の改良に関し、特に排気ガス、ブローバイガス、パージガス等のサージタンクへの導入対策に関するものである。   The present invention relates to improvement of an intake device for an engine, and more particularly to measures for introducing exhaust gas, blow-by gas, purge gas and the like into a surge tank.

特許文献１には、吸気供給源から吸気導入孔を経てサージタンク内に導入された吸気と、ガス導入口からガス導入通路及びガス排出口を経て上記サージタンク内に排出された排気ガス、ブローバイガス、パージガスのうち少なくとも一種の不純物を含む不完全燃焼ガスとを混合させて、再びエンジンの燃焼室に供給して再燃焼させて、排気ガス等のクリーン化を図るようにしたエンジンの吸気装置が開示されている。
特開２００１−１４０７１３号公報（第２頁、図６） Patent Document 1 discloses intake air introduced into a surge tank from an intake supply source through an intake introduction hole, exhaust gas discharged from the gas introduction port into the surge tank through a gas introduction passage and a gas discharge port, and blow-by. Intake device for an engine that mixes incomplete combustion gas containing at least one impurity of gas and purge gas, and supplies it again to the combustion chamber of the engine for recombustion to clean exhaust gas and the like Is disclosed.
JP 2001-140713 A (2nd page, FIG. 6)

しかし、上記特許文献１によると、ガスをサージタンク内に排出するガス排出口がガス導入通路のガス導入口より上方に位置して、ガス導入通路がガス排出口に向かって上方に傾斜しているため、エンジン停止時に、ガス導入口からガス導入通路に導入されたガスがガス導入通路に滞留し、冬期のように外気温が低くなる時期には上記ガス導入通路内で滞留したガス中の水分が凍結して、該通路が閉塞され、排気ガス等のクリーン化が図れなくなる。また、エンジンルーム内には十分なスペースが無いためガス導入口の配置によっては、ガスを供給するホースが組付けにくい場合がある。   However, according to Patent Document 1, the gas discharge port for discharging gas into the surge tank is positioned above the gas introduction port of the gas introduction passage, and the gas introduction passage is inclined upward toward the gas discharge port. Therefore, when the engine is stopped, the gas introduced into the gas introduction passage from the gas introduction port stays in the gas introduction passage, and when the outside air temperature becomes low as in winter, the gas in the gas introduction passage stays in the gas introduction passage. Moisture freezes, the passage is blocked, and exhaust gas or the like cannot be cleaned. Also, since there is not enough space in the engine room, it may be difficult to assemble a hose that supplies gas depending on the arrangement of the gas inlet.

この発明はかかる点に鑑みてなされたものであり、その目的とするところは、ガス導入通路内にガスが滞留して該ガス中の水分がガス導入通路内で凍結するのを防止することである。加えて、ガス供給用のホースの組付を容易にし、作業性の向上を図る。   The present invention has been made in view of such a point, and the object of the present invention is to prevent the gas from staying in the gas introduction passage and the moisture in the gas from freezing in the gas introduction passage. is there. In addition, the assembly of the gas supply hose is facilitated to improve workability.

上記の目的を達成するため、この発明は、サージタンクに連通するガス導入通路の姿勢に工夫を凝らしたことを特徴とする。   In order to achieve the above object, the present invention is characterized in that the attitude of the gas introduction passage communicating with the surge tank has been devised.

具体的には、この発明は、第１分割面を有する上側の第１半体と第２分割面を有する下側の第２半体との両分割面を接合してなり、上記第２半体の後壁に吸気導入孔が形成されたサージタンクと、上記第１半体の前壁と第２半体の前壁とで構成される上記サージタンクの前壁に突設された複数本の分岐管とを備え、上記吸気導入孔を経て上記サージタンク内に導入された吸気を排気ガス、ブローバイガス、パージガスのうち少なくとも一種のガスと混合して上記各分岐管を経てエンジンに供給するエンジンの吸気装置を対象とし、次のような解決手段を講じた。   Specifically, the present invention is formed by joining both divided surfaces of an upper first half having a first divided surface and a lower second half having a second divided surface, and the second half. A plurality of protrusions projecting on the front wall of the surge tank, which is composed of a surge tank having an intake introduction hole formed in the rear wall of the body, and a front wall of the first half and a front wall of the second half The intake air introduced into the surge tank through the intake air introduction hole is mixed with at least one of exhaust gas, blow-by gas, and purge gas, and supplied to the engine via the respective branch tubes. The following solutions were taken for the engine intake system.

すなわち、請求項１に記載の発明は、上記第１半体及び第２半体における上記後壁側の分割面間には、上記吸気導入孔の上方位置で上記サージタンク内に開口して上記ガスをサージタンク内に排出するガス排出口を一端に有するガス導入通路が形成され、該ガス導入通路の他端には、上記ガスをガス導入通路に導入するガス導入口が上記ガス排出口より上方位置になるように形成され、上記ガス導入通路は、ガス導入口からガス排出口に向かって全体的に下方に傾斜しており、さらに、上記第１半体における上記後壁側の分割面には、該分割面の一部が部分的に上方に膨出する第１半体側膨出部が形成され、上記第２半体における上記後壁側の分割面には、上記第１半体側膨出部に対応して上方に膨出する第２半体側膨出部が形成され、上記膨出部間には上記ガス導入通路の少なくとも一部が形成され、上記ガス導入口は上記膨出部側に形成されていることを特徴とする。 That is, according to the first aspect of the present invention, the first half body and the second half body are opened between the rear wall side dividing surfaces in the surge tank at a position above the intake air introduction hole. A gas introduction passage having a gas discharge port at one end for discharging gas into the surge tank is formed, and a gas introduction port for introducing the gas into the gas introduction passage is formed at the other end of the gas introduction passage from the gas discharge port. The gas introduction passage is formed so as to be in an upper position, and the gas introduction passage is inclined downward from the gas introduction port to the gas discharge port as a whole, and further, the dividing surface on the rear wall side in the first half body Is formed with a first half-side bulging portion in which a part of the dividing surface partially bulges upward, and the dividing surface on the rear wall side in the second half is on the first half-side A second half-side bulging portion bulging upward corresponding to the bulging portion is formed, Between detecting portion at least part of the gas inlet passage is formed, the gas inlet is characterized by being formed in the bulged portion.

請求項１に係る発明によれば、ガス導入口をガス排出口より上方位置になるように形成し、ガス導入通路を上記ガス導入口からガス排出口に向かって全体的に下方に傾斜させているので、ガスをサージタンクにスムーズに排出することができ、ガスがガス導入通路内に滞留せず、冬期のように外気温が低くなる時期でもガス中の水分のガス導入通路内での凍結を防止することができる。また、ガスが吸気導入孔の上方位置から排出されるので吸気とガスの混合が良くなってエンジンの各気筒に供給されて燃焼バランスが均等に保たれる。   According to the first aspect of the present invention, the gas introduction port is formed so as to be positioned above the gas discharge port, and the gas introduction passage is entirely inclined downward from the gas introduction port toward the gas discharge port. Therefore, the gas can be discharged smoothly into the surge tank, the gas does not stay in the gas introduction passage, and the moisture in the gas freezes in the gas introduction passage even when the outside air temperature is low, such as in winter. Can be prevented. Further, since the gas is discharged from the position above the intake air introduction hole, the mixing of the intake air and the gas is improved and supplied to each cylinder of the engine, and the combustion balance is kept uniform.

さらに、第１半体及び第２半体における後壁側の分割面に形成された膨出部間にガス導入通路の一部を形成し、ガス導入口を膨出部側に形成しているので、分割面の周りに備品が配置されていてもガス導入口は分割面より上方にあるため、上記ガス導入口に対するガス供給用のホースの取付が容易になり作業性が向上するため、備品の配置が制約されない。また、膨出部間にガス導入通路の少なくとも一部を形成しているため、膨出部対応箇所の分割面がガス排出口に向かって上方に傾斜していても、ガス導入通路をガス排出口に向かって全体的に下方に傾斜させることができ、ガスをガス導入通路内に滞留することなくサージタンクにスムーズに排出して、冬期などにおいてガス中の水分がガス導入通路内で凍結するのを防止することができる。 Further, a part of the gas introduction passage is formed between the bulging portions formed on the rear wall side dividing surface in the first half and the second half, and the gas introduction port is formed on the bulging portion side. Therefore, even if fixtures are arranged around the dividing plane, the gas inlet is above the dividing plane, so it is easy to attach the gas supply hose to the gas inlet and the workability is improved. Is not constrained. In addition, since at least a part of the gas introduction passage is formed between the bulging portions, even if the dividing surface of the portion corresponding to the bulging portion is inclined upward toward the gas discharge port, the gas introduction passage can Can be inclined downwards toward the outlet as a whole, gas is smoothly discharged to the surge tank without staying in the gas introduction passage, and moisture in the gas freezes in the gas introduction passage in winter Can be prevented .

以下、この発明の実施形態について図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（参考例１）
図１〜図６はこの発明の参考例１に係るエンジンの吸気装置１を示す。該吸気装置１は、第１分割面２を有し下方が開放した上側の第１半体３と、第２分割面４を有し上方が開放した下側の第２半体５との両分割面２，４を接合してなる分割タイプのサージタンク７を備え、上記第１半体３は、天井壁３ａ、前壁３ｂ、後壁３ｃ及び両側壁３ｄで構成され、上記第２半体５は、底壁５ａ、前壁５ｂ、後壁５ｃ及び両側壁５ｄで構成されている。また、上記第２半体５の後壁５ｃのほぼ中央には吸気導入孔９が形成され、後壁５ｃ外面の吸気導入孔９外周にはスロットルバルブ（図示せず）が取り付けられる取付部１１が膨出形成されている。そして、図外の吸気供給源からスロットルバルブ及び吸気導入孔９を介してサージタンク７内に吸気を導入するようになっている。 ( Reference Example 1)
Figures 1-6 show the intake device 1 for an engine according to Embodiment 1 of the present invention. The intake device 1 includes both an upper first half 3 having a first dividing surface 2 and opened downward, and a lower second half 5 having a second dividing surface 4 and opened upward. A split-type surge tank 7 formed by joining the split surfaces 2 and 4 is provided, and the first half 3 is composed of a ceiling wall 3a, a front wall 3b, a rear wall 3c, and both side walls 3d, and the second half The body 5 includes a bottom wall 5a, a front wall 5b, a rear wall 5c, and both side walls 5d. In addition, an intake introduction hole 9 is formed substantially at the center of the rear wall 5c of the second half body 5, and a mounting portion 11 to which a throttle valve (not shown) is attached to the outer periphery of the intake introduction hole 9 on the outer surface of the rear wall 5c. Is formed bulging. Then, intake air is introduced into the surge tank 7 from an unillustrated intake supply source through the throttle valve and the intake introduction hole 9.

上記第１半体３の前壁３ｂと第２半体５の前壁５ｂとで構成される上記サージタンク７の前壁７ａには、上記サージタンク７内に導入された吸気と、排気ガス、ブローバイガス、パージガスのうち少なくとも一種のガスとを混合してエンジンに供給する３本の分岐管１３が突設され、これら分岐管１３は第１半体３側の半割分岐管部１３ａと上記第２半体５の半割分岐管部１３ｂとを組み合わせて構成されている。また、これら分岐管１３の先端は取付フランジ１５に接続され、該取付フランジ１５には取付孔１７が形成されており、該取付孔１７にボルト（図示せず）を挿入して取付フランジ１５をエンジンに固定するようになっている。   The front wall 7a of the surge tank 7 constituted by the front wall 3b of the first half 3 and the front wall 5b of the second half 5 has intake air introduced into the surge tank 7 and exhaust gas. , Three branch pipes 13 that are mixed with at least one of the blow-by gas and the purge gas and are supplied to the engine are projected, and these branch pipes 13 are connected to the half branch pipe portion 13a on the first half 3 side. The second half body 5 is configured in combination with the half-branch pipe portion 13b. The ends of the branch pipes 13 are connected to a mounting flange 15, and a mounting hole 17 is formed in the mounting flange 15. A bolt (not shown) is inserted into the mounting hole 17 to attach the mounting flange 15. It is designed to be fixed to the engine.

上記第１分割面２及び第２分割面４における前壁３ｂ，５ｂ側の分割面部２ａ，４ａと、後壁３ｃ，５ｃ側の分割面部２ｂ，４ｂとは水平面で構成されている。一方、両側壁３ｄ，５ｄ側の分割面部２ｃ，４ｃは後壁３ｃ，５ｃ側に向かって上方に傾斜する傾斜面で構成されている。   In the first dividing surface 2 and the second dividing surface 4, the dividing surface portions 2a, 4a on the front walls 3b, 5b side and the dividing surface portions 2b, 4b on the rear walls 3c, 5c side are configured in a horizontal plane. On the other hand, the split surface portions 2c and 4c on the side walls 3d and 5d are formed of inclined surfaces that are inclined upward toward the rear walls 3c and 5c.

また、上記第１分割面２及び第２分割面４にはフランジ２３，２５が全周に亙って形成され、該フランジ２３，２５の合わせ面も分割面の一部を構成している。上記後壁３ｃ，５ｃ側の分割面部２ｂ，４ｂ間（フランジ２３，２５の合わせ面間）にはガス導入通路２７が形成され、該ガス導入通路２７の一端には、吸気導入孔９の上方位置でサージタンク７内に開口してガスをサージタンク７内に排出するガス排出口２９が形成され、サージタンク７内に向かって前下がりに傾斜している。上記ガス導入通路２７の他端には、上記ガスをガス導入通路２７に導入するガス導入口２８が上記ガス排出口２９より上方位置になるように形成されている。   Further, flanges 23 and 25 are formed on the first and second divided surfaces 2 and 4 over the entire circumference, and the mating surfaces of the flanges 23 and 25 also constitute a part of the divided surface. A gas introduction passage 27 is formed between the divided surface portions 2b and 4b on the side of the rear walls 3c and 5c (between the mating surfaces of the flanges 23 and 25), and one end of the gas introduction passage 27 is located above the intake introduction hole 9. A gas discharge port 29 that opens into the surge tank 7 at a position and discharges the gas into the surge tank 7 is formed, and is inclined forward and downward toward the surge tank 7. At the other end of the gas introduction passage 27, a gas introduction port 28 for introducing the gas into the gas introduction passage 27 is formed at a position above the gas discharge port 29.

具体的には、上記ガス導入通路２７は、上記第１半体３側のフランジ２３下面（分割面部２ｂ）に形成された溝２７ａと、第２半体５側のフランジ２５（分割面部４ｂ）に形成された溝２７ｂとを組み合わせて構成されている。上記第１半体３側の溝２７ａは、ガス排出口２９に向かうにしたがって浅くなっており、それに対して、第２半体３側の溝２７ｂは、ガス排出口２９に向かうにしたがって深くなっている。その結果、上記ガス導入通路２７は、全体がガス導入口２８からガス排出口２９に向かって下方に傾斜している。また、上記第１半体３における後壁３ｃのフランジ２３にはガス導入パイプ３１が上記ガス導入通路２７のガス導入口２８に連通するように形成されている。そして、エンジンの排気ガス等のガスを上記ガス導入パイプ３１、ガス導入口２８及びガス導入通路２７を経てガス排出口２９からサージタンク７内に排出するようになっている。   Specifically, the gas introduction passage 27 includes a groove 27a formed on the lower surface (division surface portion 2b) of the flange 23 on the first half 3 side and a flange 25 (division surface portion 4b) on the second half 5 side. The groove 27b is formed in combination. The groove 27 a on the first half 3 side becomes shallower toward the gas discharge port 29, whereas the groove 27 b on the second half 3 side becomes deeper toward the gas discharge port 29. ing. As a result, the entire gas introduction passage 27 is inclined downward from the gas introduction port 28 toward the gas discharge port 29. A gas introduction pipe 31 is formed on the flange 23 of the rear wall 3 c in the first half 3 so as to communicate with the gas introduction port 28 of the gas introduction passage 27. Gas such as engine exhaust gas is discharged from the gas discharge port 29 into the surge tank 7 through the gas introduction pipe 31, the gas introduction port 28, and the gas introduction passage 27.

このように、参考例１では、ガス導入口２８をガス排出口２９より上方位置になるように形成し、ガス導入通路２７全体を上記ガス導入口２８からガス排出口２９に向かって下方に傾斜させているので、ガスをサージタンク７にスムーズに排出してガス導入通路２７内に滞留しないようにでき、冬期のように外気温が低くなる時期でもガス中の水分のガス導入通路２７内での凍結を防止することができる。また、ガスが吸気導入孔９の上方位置から排出されるので吸気とガスの混合が良くなってエンジンの各気筒に供給されて燃焼バランスが均等に保たれる。さらに、ガス排出口２９はサージタンク７内に向かって前下がりに傾斜しているので、ガス排出口２９から排出されるガスを吸気導入孔９から導入される吸気に向かって導くことができ、ガスと吸気との混合をより効率よく行うことができる。 As described above, in Reference Example 1, the gas inlet 28 is formed so as to be positioned above the gas outlet 29, and the entire gas inlet passage 27 is inclined downward from the gas inlet 28 toward the gas outlet 29. Therefore, the gas can be smoothly discharged into the surge tank 7 so as not to stay in the gas introduction passage 27, and the moisture in the gas introduction passage 27 can be retained even when the outside air temperature is low as in the winter. Can be prevented from freezing. Further, since the gas is discharged from the position above the intake air introduction hole 9, the mixture of the intake air and the gas is improved and supplied to each cylinder of the engine, and the combustion balance is kept uniform. Furthermore, since the gas discharge port 29 is inclined forward and downward toward the inside of the surge tank 7, the gas discharged from the gas discharge port 29 can be guided toward the intake air introduced from the intake air introduction hole 9, Mixing of gas and intake air can be performed more efficiently.

なお、参考例１では、上記ガス導入通路２７全体をガス排出口２９に向かって下方に傾斜させたが、ガス導入通路２７内にガスが滞留しない構造であれば、一部に水平通路部を設けてもよい。以下に述べる実施形態２，３においても同様である。 In Reference Example 1, the entire gas introduction passage 27 is inclined downward toward the gas discharge port 29. However, if the gas does not stay in the gas introduction passage 27, a horizontal passage portion is partially provided. It may be provided. The same applies to Embodiments 2 and 3 described below.

（実施形態）
図７〜図１０はこの発明の実施形態に係るエンジンの吸気装置１を示す。本実施形態では、第１半体３の一方（正面視で右側）の側壁３ｄから後壁３ｃにかけてのフランジ２３（分割面部２ｃ，２ｂ）上面には、分割面部２ｃ，２ｂの一部が部分的に上方に膨出する第１半体側膨出部３３が形成され、該膨出部３３は側壁３ｄから後壁３ｃにかけて徐々に上下方向への膨出量が少なくなっている。一方、第２半体５の一方（正面視で右側）の側壁５ｄから後壁５ｃにかけてのフランジ２５（分割面部４ｃ，４ｂ）上面には、上記第１半体側膨出部３３に対応して分割面部４ｃ，４ｂの一部が部分的に上方に膨出する第２半体側膨出部３７が形成されている。そして、上記第１半体側膨出部３３と第２半体側膨出部３７との間には、側壁部３ｄ，５ｄ側にガス迂回通路部３９を有する略Ｌ字形のガス導入通路２７が形成されている。また、ガス導入口２８は分割面部４ｃ側の膨出部３３，３７側の上部に形成されており、上記ガス迂回通路部３９の端部にはガス導入パイプ３１が接続されている。このガス導入通路２７は、全体がガス導入口２８からガス排出口２９に向かって下方に傾斜している。そして、エンジンの排気ガス等のガスを上記ガス導入パイプ３１、ガス導入口２８及びガス導入通路２７を経てガス排出口２９からサージタンク７内に排出するようになっている。 (Working-shaped state)
7 to 10 show an intake device 1 of the engine according to the embodiment forms state of the present invention. In this embodiment shaped condition, the flange 23 (split surface 2c, 2b) of the toward the rear wall 3c of the side wall 3d of one of the first half 3 (right in front view) on the top surface is divided surface 2c, part of 2b The first half-side bulging portion 33 that bulges partially upward is formed, and the bulging portion 33 gradually reduces the amount of bulging in the vertical direction from the side wall 3d to the rear wall 3c. On the other hand, the upper surface of the flange 25 (divided surface portions 4c, 4b) from the side wall 5d to the rear wall 5c on one side (right side in front view) of the second half 5 corresponds to the first half-side bulged portion 33. A second half-side bulging portion 37 in which a part of the dividing surface portions 4c and 4b partially bulges upward is formed. A substantially L-shaped gas introduction passage 27 having a gas bypass passage 39 on the side walls 3d and 5d is formed between the first half-side bulging portion 33 and the second half-side bulging portion 37. Has been. The gas introduction port 28 is formed in the upper part on the bulging portions 33 and 37 side on the dividing surface portion 4 c side, and a gas introduction pipe 31 is connected to the end of the gas bypass passage portion 39. The entire gas introduction passage 27 is inclined downward from the gas introduction port 28 toward the gas discharge port 29. Gas such as engine exhaust gas is discharged from the gas discharge port 29 into the surge tank 7 through the gas introduction pipe 31, the gas introduction port 28, and the gas introduction passage 27.

その他は参考例１と同様に構成されているので、同一の構成箇所には同一の符号を付してその説明を省略する。 The rest of the configuration is the same as in Reference Example 1, and thus the same components are denoted by the same reference numerals and description thereof is omitted.

したがって、実施形態においては、第１半体３及び第２半体５の分割面部２ｂ，２ｃ，４ｂ，４ｃに形成された膨出部３３，３７間に、ガス迂回通路部３９を有するガス導入通路２７を形成し、ガス導入口２８を膨出部３３，３７側に形成しているので、分割面部２ｂ，２ｃ，４ｂ，４ｃの周りに備品が配置されていてもガス導入口２８は分割面部２ｂ，２ｃ，４ｂ，４ｃより上方にあるため、上記ガス導入口２８に接続されたガス導入パイプ３１に対するガス供給用のホース（図示せず）の組付が容易になり作業性が向上し、さらに備品の配置が制約されない。 Therefore, Oite the implementation type state is split surface 2b of the first half 3 and the second half 5, 2c, 4b, between the bulge portion 33 and 37 formed in the 4c, a gas bypass passage 39 Since the gas introduction passage 27 is formed and the gas introduction port 28 is formed on the bulging portions 33 and 37 side, the gas introduction port is provided even if the equipment is arranged around the divided surface portions 2b, 2c, 4b and 4c. Since 28 is above the divided surface portions 2b, 2c, 4b, and 4c, it is easy to assemble a gas supply hose (not shown) to the gas introduction pipe 31 connected to the gas introduction port 28. And the placement of equipment is not constrained.

また、実施形態では、膨出部３３，３７対応箇所の分割面部２ｃ，４ｃがガス排出口２９に向かって上方に傾斜しているが、膨出部３３，３７間にガス導入通路２７全体をガス排出口２９に向かって下方に傾斜させて形成しているため、ガスをガス導入通路２７内に滞留することなくサージタンク７にスムーズに排出して、冬期などにおいてガス中の水分がガス導入通路２７内で凍結するのを防止することができる。 Further, in the exemplary form state, split surface 2c of the bulge portion 33 and 37 corresponding portion, although 4c is inclined upward toward the gas discharge port 29, the gas introduction passage 27 between the bulged portion 33 and 37 Since the whole is formed to be inclined downward toward the gas discharge port 29, the gas is smoothly discharged to the surge tank 7 without staying in the gas introduction passage 27, and moisture in the gas is absorbed in winter. Freezing in the gas introduction passage 27 can be prevented.

なお、膨出部３３，３７を側壁３ｄ側にのみ設けてガス迂回通路部３９だけを膨出部３３，３７間に形成してもよい。   The bulging portions 33 and 37 may be provided only on the side wall 3d side, and only the gas bypass passage portion 39 may be formed between the bulging portions 33 and 37.

（参考例２）
図１１及び図１２はこの発明の参考例２に係るエンジンの吸気装置１を示す。本参考例２では、第１半体３と第２半体５との後壁３ｃ，５ｃ側のフランジ２３，２５に連続する突出部材４１が形成されている。該突出部材４１は、第１半体３における上記後壁３ｃ側の分割面２ｂに連続する分割面を有し第１半体３に一体的に形成された第１突出部４１ａと、第２半体５における上記後壁５ｃ側の分割面４ｂに連続する分割面を有し上記第１突出部４１ａに対応して第２半体５に一体的に形成された第２突出部４１ｂとで構成されている。そして、第１突出部４１ａ及び第２突出部４１ｂの分割面は互いに接合され、該第１突出部４１ａ及び第２突出部４１ｂの分割面間にはガス導入通路２７の一部が突出して形成されている。さらに、ガス導入口２８は突出部材４１の先端側に形成され、該ガス導入口２８にガス導入パイプ３１が接続されている。このガス導入通路２７は、全体がガス導入口２８からガス排出口２９に向かって下方に傾斜している。そして、エンジンの排気ガス等のガスを上記ガス導入パイプ３１、ガス導入口２８及びガス導入通路２７を経てガス排出口２９からサージタンク７内に排出するようになっている。 ( Reference Example 2 )
11 and 12 show an engine intake device 1 according to Reference Example 2 of the present invention. In the second reference example , a protruding member 41 that is continuous with the flanges 23 and 25 on the rear walls 3c and 5c side of the first half 3 and the second half 5 is formed. The projecting member 41 includes a first projecting portion 41a formed integrally with the first half 3 having a split surface continuous with the split surface 2b on the rear wall 3c side of the first half 3; A second projecting portion 41b integrally formed with the second half 5 corresponding to the first projecting portion 41a and having a split surface that is continuous with the split surface 4b on the rear wall 5c side of the half body 5. It is configured. The dividing surfaces of the first protruding portion 41a and the second protruding portion 41b are joined to each other, and a part of the gas introduction passage 27 protrudes between the dividing surfaces of the first protruding portion 41a and the second protruding portion 41b. Has been. Further, the gas introduction port 28 is formed on the front end side of the protruding member 41, and a gas introduction pipe 31 is connected to the gas introduction port 28. The entire gas introduction passage 27 is inclined downward from the gas introduction port 28 toward the gas discharge port 29. Gas such as engine exhaust gas is discharged from the gas discharge port 29 into the surge tank 7 through the gas introduction pipe 31, the gas introduction port 28, and the gas introduction passage 27.

その他は参考例１と同様に構成されているので、同一の構成箇所には同一の符号を付してその説明を省略する。 The rest of the configuration is the same as in Reference Example 1, and thus the same components are denoted by the same reference numerals and description thereof is omitted.

したがって、参考例２においては、第１半体３及び第２半体５に第１突出部４１ａ及び第２突出部４１ｂを一体的に形成し、該第１突出部４１ａ及び第２突出部４１ｂの上記第１半体３及び第２半体５の分割面部２ｂ，４ｂに連続する分割面部２ｂ，４ｂ間にガス導入通路２７の一部を突出させて形成し、ガス導入口２８を突出部材４１側に形成しているので、備品がサージタンク７に接近して配置されていてもガス導入口２８は離れたところに設けられるため、上記ガス導入口２８に接続されたガス導入パイプ３１に対するガス供給用のホース（図示せず）の組付が容易になり作業性が向上する。また、ガス導入通路２７全体をガス排出口２９に向かって下方に傾斜させているので、ガスのガス導入通路２７での滞留をなくして冬期などに当該箇所におけるガス中の水分の凍結を防止することができる。 Therefore, in Reference Example 2 , the first protrusion 41a and the second protrusion 41b are integrally formed on the first half 3 and the second half 5, and the first protrusion 41a and the second protrusion 41b. A part of the gas introduction passage 27 is formed to protrude between the divided surface portions 2b and 4b continuous to the divided surface portions 2b and 4b of the first half 3 and the second half 5, and the gas introduction port 28 is formed as a protruding member. Since the gas inlet 28 is provided at a distance even when the equipment is arranged close to the surge tank 7, the gas inlet pipe 31 connected to the gas inlet 28 is connected to the gas inlet pipe 31. Assembly of a gas supply hose (not shown) is facilitated and workability is improved. In addition, since the entire gas introduction passage 27 is inclined downward toward the gas discharge port 29, the gas is not retained in the gas introduction passage 27 and freezing of moisture in the gas at the location is prevented in winter and the like. be able to.

尚、２種類以上のガスを導入する場合は、ガス導入通路に連通するようにガス導入パイプを追加すれば良い。   When two or more kinds of gases are introduced, a gas introduction pipe may be added so as to communicate with the gas introduction passage.

この発明は、エンジンの吸気装置においてガスのサージタンクへの導入対策に有用である。   The present invention is useful as a countermeasure for introducing gas into a surge tank in an engine intake system.

参考例１に係る吸気装置を前側から見た斜視図である。It is the perspective view which looked at the air intake device which concerns on the reference example 1 from the front side. 参考例１に係る吸気装置を後側から見た斜視図である。It is the perspective view which looked at the air intake device which concerns on the reference example 1 from the rear side. 参考例１においてサージタンクの第１半体を下側から見た斜視図である。 In the reference example 1, it is the perspective view which looked at the 1st half of the surge tank from the lower side. 参考例１においてサージタンクの第２半体を上側から見た斜視図である。 In the reference example 1, it is the perspective view which looked at the 2nd half of the surge tank from the upper side. 図２のＶ−Ｖ線における断面図である。It is sectional drawing in the VV line | wire of FIG. 図５のVI−VI線における断面図である。It is sectional drawing in the VI-VI line of FIG. 実施形態における図１相当図である。Is 1 equivalent diagram definitive in practice shaped state. 実施形態における図２相当図である。Is 2 corresponding to FIG definitive in practice shaped state. 図７のIX−IX線における断面図である。It is sectional drawing in the IX-IX line of FIG. 図７のＸ−Ｘ線における断面図である。It is sectional drawing in the XX line of FIG. 参考例２における図１相当図である。FIG. 3 is a view corresponding to FIG. 1 in Reference Example 2 . 参考例２における図２相当図である。FIG. 3 is a view corresponding to FIG. 2 in Reference Example 2 .

１ 吸気装置
２ 第１分割面
３ 第１半体
４ 第２分割面
５ 第２半体
７ サージタンク
９ 吸気導入孔
２７ ガス導入通路
２８ ガス導入口
２９ ガス排出口 DESCRIPTION OF SYMBOLS 1 Intake device 2 1st division surface 3 1st half body 4 2nd division surface 5 2nd half body 7 Surge tank 9 Intake inlet hole 27 Gas introduction path 28 Gas introduction port 29 Gas discharge port

Claims (1)

第１分割面を有する上側の第１半体と第２分割面を有する下側の第２半体との両分割面を接合してなり、上記第２半体の後壁に吸気導入孔が形成されたサージタンクと、上記第１半体の前壁と第２半体の前壁とで構成される上記サージタンクの前壁に突設された複数本の分岐管とを備え、上記吸気導入孔を経て上記サージタンク内に導入された吸気を排気ガス、ブローバイガス、パージガスのうち少なくとも一種のガスと混合して上記各分岐管を経てエンジンに供給するエンジンの吸気装置であって、
上記第１半体及び第２半体における上記後壁側の分割面間には、上記吸気導入孔の上方位置で上記サージタンク内に開口して上記ガスをサージタンク内に排出するガス排出口を一端に有するガス導入通路が形成され、
該ガス導入通路の他端には、上記ガスをガス導入通路に導入するガス導入口が上記ガス排出口より上方位置になるように形成され、
上記ガス導入通路は、ガス導入口からガス排出口に向かって全体的に下方に傾斜しており、
さらに、上記第１半体における上記後壁側の分割面には、該分割面の一部が部分的に上方に膨出する第１半体側膨出部が形成され、上記第２半体における上記後壁側の分割面には、上記第１半体側膨出部に対応して上方に膨出する第２半体側膨出部が形成され、上記膨出部間には上記ガス導入通路の少なくとも一部が形成され、上記ガス導入口は上記膨出部側に形成されていることを特徴とするエンジンの吸気装置。 The upper half part having the first split surface and the lower second half part having the second split surface are joined together, and an air intake hole is formed in the rear wall of the second half body. And a plurality of branch pipes projecting from the front wall of the surge tank, the surge tank being formed by the front wall of the first half and the front wall of the second half. An intake device for an engine that mixes the intake air introduced into the surge tank through the introduction hole with at least one of exhaust gas, blow-by gas, and purge gas and supplies the mixed gas to the engine through the branch pipes,
A gas discharge port that opens into the surge tank at a position above the intake inlet hole and discharges the gas into the surge tank between the split surfaces on the rear wall side in the first half and the second half Is formed at one end of the gas introduction passage,
At the other end of the gas introduction passage, a gas introduction port for introducing the gas into the gas introduction passage is formed at a position above the gas discharge port,
The gas introduction passage is generally inclined downward from the gas introduction port toward the gas discharge port ,
Further, a first half-side bulging portion in which a part of the dividing surface partially bulges upward is formed on the rear wall-side dividing surface in the first half. A split surface on the rear wall side is formed with a second half-side bulging portion that bulges upward corresponding to the first half-side bulging portion, and the gas introduction passage is between the bulging portions. An air intake apparatus for an engine, wherein at least a part thereof is formed and the gas introduction port is formed on the bulging portion side .
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