JP2021046792A

JP2021046792A - EGR gas distributor

Info

Publication number: JP2021046792A
Application number: JP2019167900A
Authority: JP
Inventors: 海翔曹; Haixiang Cao; 昭成安江; Akinari Yasue; 賢士楠田; Kenji Kusuda; 吉岡　衛; Mamoru Yoshioka; 衛吉岡
Original assignee: Aisan Industry Co Ltd
Current assignee: Aisan Industry Co Ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2021-03-25

Abstract

To improve heat-retaining properties of inside of an EGR gas distributor and suppress generation of condensation water.SOLUTION: An EGR gas distributor 1 for distributing an EGR gas to each of a plurality of branch pipes constituting an intake manifold includes: a gas inlet 11 to which the EGR gas is introduced; a gas chamber 13 collecting the EGR gas introduced from the gas inlet 11; and a plurality of gas distribution passages 14A-14D each branched from the gas chamber 13 and communicated with each of the branch pipes. Heat insulating layers 15 are formed in at least a part of the gas chamber 13 and the gas distribution passages 14A-14D. At least a part of the gas chamber 13 and the gas distribution passages 14A-14D is constituted by an outer wall 16 and the inner wall 17. The heat insulating layer 15 includes an intermediate layer 18 (air layer) between the outer wall 16 and the inner wall 17.SELECTED DRAWING: Figure 5

Description

この明細書に開示される技術は、エンジンの複数の気筒へＥＧＲガスを分配するために吸気マニホールドに設けられるＥＧＲガス分配器に関する。 The technology disclosed herein relates to an EGR gas distributor provided in an intake manifold to distribute EGR gas to multiple cylinders of an engine.

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」が知られている。この吸気装置は、複数の吸気通路（分岐管）を含む吸気装置本体（吸気マニホールド）と、吸気マニホールドとは別体に設けられ、分岐管に外部ガス（ＥＧＲガス）を導入可能に構成された外部ガス通路部（ＥＧＲガス分配器）とを備える。ＥＧＲガス分配器は、吸気マニホールド内部に配置されると共に、分岐管の内面と空間を隔てて配置される。これにより、ＥＧＲガス分配器が、外気温の影響を直接受けないようになっている。 Conventionally, as this kind of technology, for example, the "intake device" described in Patent Document 1 below is known. This intake device is provided separately from the intake device main body (intake manifold) including a plurality of intake passages (branch pipes) and the intake manifold, and is configured so that external gas (EGR gas) can be introduced into the branch pipe. It is provided with an external gas passage portion (EGR gas distributor). The EGR gas distributor is arranged inside the intake manifold and is arranged so as to be separated from the inner surface of the branch pipe. As a result, the EGR gas distributor is not directly affected by the outside air temperature.

特開２０１６−７９８９６号公報Japanese Unexamined Patent Publication No. 2016-79896

ところが、特許文献１に記載される吸気装置では、ＥＧＲガス分配器の、吸気マニホールド内部に設けられる一部分以外は、十分に断熱されていない。そのため、ＥＧＲガス分配器の外気温に対する保温性が不十分となり、その内部で凝縮水が発生するおそれがある。 However, in the intake device described in Patent Document 1, the heat is not sufficiently insulated except for a part of the EGR gas distributor provided inside the intake manifold. Therefore, the heat retention property of the EGR gas distributor with respect to the outside air temperature becomes insufficient, and condensed water may be generated inside the EGR gas distributor.

この開示技術は、上記事情に鑑みてなされたものであって、その目的は、内部の保温性を向上させ、凝縮水の発生を抑制することを可能としたＥＧＲガス分配器を提供することにある。 This disclosure technique has been made in view of the above circumstances, and an object thereof is to provide an EGR gas distributor capable of improving internal heat retention and suppressing generation of condensed water. is there.

上記目的を達成するために、請求項１に記載の技術は、吸気マニホールドを構成する複数の分岐管のそれぞれにＥＧＲガスを分配するためのＥＧＲガス分配器であって、ＥＧＲガスが導入されるガス入口と、ガス入口から導入されるＥＧＲガスを集めるガスチャンバと、ガスチャンバから分岐され、各分岐管にそれぞれ連通する複数のガス分配通路とを備えたＥＧＲガス分配器において、ガスチャンバ及びガス分配通路の少なくとも一部に断熱層が設けられることを趣旨とする。 In order to achieve the above object, the technique according to claim 1 is an EGR gas distributor for distributing EGR gas to each of a plurality of branch pipes constituting an intake manifold, and EGR gas is introduced. In an EGR gas distributor having a gas inlet, a gas chamber that collects EGR gas introduced from the gas inlet, and a plurality of gas distribution passages that are branched from the gas chamber and communicate with each branch pipe, the gas chamber and gas. The purpose is to provide a heat insulating layer at least a part of the distribution passage.

上記技術の構成によれば、ガスチャンバ及びガス分配通路の少なくとも一部に断熱層が設けられるので、ガスチャンバ及びガス分配通路の少なくとも一部から外部への放熱が抑えられる。 According to the configuration of the above technique, since the heat insulating layer is provided in at least a part of the gas chamber and the gas distribution passage, heat dissipation from at least a part of the gas chamber and the gas distribution passage to the outside can be suppressed.

上記目的を達成するために、請求項２に記載の技術は、請求項１に記載の技術において、ガスチャンバ及びガス分配通路の少なくとも一部は、外壁と内壁とから構成される二重壁構造を備え、断熱層は、外壁と内壁との間の中間層を含むことを趣旨とする。 In order to achieve the above object, the technique according to claim 2 is a double wall structure in which at least a part of the gas chamber and the gas distribution passage is composed of an outer wall and an inner wall in the technique according to claim 1. The purpose is that the heat insulating layer includes an intermediate layer between the outer wall and the inner wall.

上記技術の構成によれば、請求項１に記載の技術の作用に加え、断熱層が、外壁と内壁との間の中間層を含むので、ガスチャンバ及びガス分配通路の少なくとも一部から外部への放熱が効果的に抑えられる。 According to the configuration of the above technique, in addition to the action of the technique according to claim 1, since the heat insulating layer includes an intermediate layer between the outer wall and the inner wall, from at least a part of the gas chamber and the gas distribution passage to the outside. Heat dissipation is effectively suppressed.

上記目的を達成するために、請求項３に記載の技術は、請求項２に記載の技術において、内壁は、中間層に連通する連通孔を含むことを趣旨とする。 In order to achieve the above object, the technique according to claim 3 is the technique according to claim 2, wherein the inner wall includes a communication hole communicating with the intermediate layer.

上記技術の構成によれば、請求項２に記載の技術の作用に加え、内壁は、中間層に連通する連通孔を含むので、連通孔を通じて内壁の中と中間層との間の圧力差が無くなり、内壁の薄肉化が許容される。中間層で生じた凝縮水を内壁の中へ排出可能となる。 According to the configuration of the above technique, in addition to the operation of the technique according to claim 2, since the inner wall includes a communication hole communicating with the intermediate layer, the pressure difference between the inside of the inner wall and the intermediate layer through the communication hole is increased. It disappears and the inner wall is allowed to be thinned. The condensed water generated in the intermediate layer can be discharged into the inner wall.

上記目的を達成するために、請求項４に記載の技術は、請求項２又は３に記載の技術において、外壁は樹脂材により構成され、内壁は金属材により構成されることを趣旨とする。 In order to achieve the above object, the technique according to claim 4 is the technique according to claim 2 or 3, wherein the outer wall is made of a resin material and the inner wall is made of a metal material.

上記技術の構成によれば、請求項２又は３に記載の技術の作用に加え、内壁が金属材により構成されるので、ガス入口から導入されるＥＧＲガスの熱により内壁が速やかに暖められる。 According to the configuration of the above technique, in addition to the action of the technique according to claim 2 or 3, since the inner wall is made of a metal material, the inner wall is quickly warmed by the heat of the EGR gas introduced from the gas inlet.

上記目的を達成するために、請求項５に記載の技術は、請求項２又は３に記載の技術において、外壁と内壁は樹脂材により構成されることを趣旨とする。 In order to achieve the above object, the technique according to claim 5 is the technique according to claim 2 or 3, wherein the outer wall and the inner wall are made of a resin material.

上記技術の構成によれば、請求項２又は３に記載の技術の作用に加え、外壁と内壁の両方が樹脂材により構成されるので、内壁に対する外気温の影響が効果的に抑えられる。 According to the configuration of the above technique, in addition to the action of the technique according to claim 2 or 3, since both the outer wall and the inner wall are made of a resin material, the influence of the outside air temperature on the inner wall can be effectively suppressed.

上記目的を達成するために、請求項６に記載の技術は、請求項４又は５に記載の技術において、外壁と内壁との間には、内壁を外壁に保持するための保持構造が設けられ、保持構造は、樹脂材の溶着による溶着部により構成されることを趣旨とする。 In order to achieve the above object, the technique according to claim 6 has a holding structure for holding the inner wall to the outer wall between the outer wall and the inner wall in the technique according to claim 4 or 5. The purpose of the holding structure is to include a welded portion by welding a resin material.

上記技術の構成によれば、請求項４又は５に記載の技術の作用に加え、保持構造が、樹脂材の溶着による溶着部により構成されるので、内壁を外壁に対し十分な強度で保持可能となる。 According to the configuration of the above technique, in addition to the action of the technique according to claim 4 or 5, the holding structure is composed of a welded portion by welding of a resin material, so that the inner wall can be held with sufficient strength with respect to the outer wall. It becomes.

上記目的を達成するために、請求項７に記載の技術は、請求項４又は５に記載の技術において、外壁と内壁との間には、内壁を外壁に保持するための保持構造が設けられ、保持構造は、外壁及び内壁のうち一方に設けられる凸部を他方に設けられる凹部に係合させる係合部により構成されることを趣旨とする。 In order to achieve the above object, the technique according to claim 7 has a holding structure for holding the inner wall to the outer wall between the outer wall and the inner wall in the technique according to claim 4 or 5. The holding structure is intended to be composed of an engaging portion that engages a convex portion provided on one of the outer wall and the inner wall with a concave portion provided on the other.

上記技術の構成によれば、請求項４又は５に記載の技術の作用に加え、保持構造が、凸部を凹部に係合させる係合部により構成されるので、内壁を外壁に対し比較的簡易に保持可能となる。 According to the configuration of the above technique, in addition to the action of the technique according to claim 4 or 5, the holding structure is composed of an engaging portion for engaging the convex portion with the concave portion, so that the inner wall is relatively relative to the outer wall. It can be easily held.

上記目的を達成するために、請求項８に記載の技術は、請求項４又は５に記載の技術において、外壁と内壁との間には、内壁を外壁に保持するための保持構造が設けられ、保持構造は、外壁の一部を内壁にかしめるかしめ部により構成されることを趣旨とする。 In order to achieve the above object, the technique according to claim 8 has a holding structure for holding the inner wall to the outer wall between the outer wall and the inner wall in the technique according to claim 4 or 5. The purpose of the holding structure is to form a caulking portion that crimps a part of the outer wall to the inner wall.

上記技術の構成によれば、請求項４又は５に記載の技術の作用に加え、保持構造が、外壁の一部を内壁にかしめるかしめ部により構成されるので、内壁を外壁に対し比較的簡易に保持可能となる。 According to the configuration of the above technique, in addition to the action of the technique according to claim 4 or 5, the holding structure is composed of a caulking portion that crimps a part of the outer wall to the inner wall, so that the inner wall is relatively relative to the outer wall. It can be easily held.

上記目的を達成するために、請求項９に記載の技術は、請求項６に記載の技術において、外壁が第１外壁体と第２外壁体とに分割して構成されると共に、内壁が第１内壁体と第２内壁体とに分割して構成され、溶着部は、第１外壁体の縁部と第２外壁体の縁部との外壁合わせ面と、第１内壁体の縁部と第２内壁体の縁部との内壁合わせ面と、第１外壁体の縁部と第１内壁体の縁部との第１外壁内壁合わせ面と、第２外壁体の縁部と第２内壁体の縁部との第２外壁内壁合わせ面とを含み、溶着部において、第１内壁体の縁部と第２内壁体の縁部が、第１外壁体の縁部と第２外壁体の縁部との間に挟まれることを趣旨とする。 In order to achieve the above object, the technique according to claim 9 is the technique according to claim 6, wherein the outer wall is divided into a first outer wall body and a second outer wall body, and the inner wall is the first. It is divided into one inner wall body and a second inner wall body, and the welded portion includes an outer wall mating surface between the edge portion of the first outer wall body and the edge portion of the second outer wall body, and the edge portion of the first inner wall body. The inner wall mating surface with the edge of the second inner wall, the first outer wall inner wall mating surface between the edge of the first outer wall and the edge of the first inner wall, and the edge and the second inner wall of the second outer wall. Including the second outer wall inner wall mating surface with the edge of the body, in the welded portion, the edge of the first inner wall and the edge of the second inner wall are the edges of the first outer wall and the second outer wall. The purpose is to be sandwiched between the edges.

上記技術の構成によれば、請求項６に記載の技術の作用に加え、溶着部において、第１内壁体の縁部と第２内壁体の縁部が、第１外壁体の縁部と第２外壁体の縁部との間に挟まれる。また、溶着部が、外壁合わせ面と、内壁合わせ面と、第１外壁内壁合わせ面と、第２外壁内壁合わせ面とを含む。従って、第１外壁体の縁部と第２外壁体の縁部との溶着と、第１内壁体の縁部と第２内壁体の縁部との溶着と、外壁と内壁との溶着とを同時に行うことが可能となる。 According to the configuration of the above technique, in addition to the action of the technique according to claim 6, in the welded portion, the edge portion of the first inner wall body and the edge portion of the second inner wall body are the edge portion and the first outer wall body. 2 It is sandwiched between the outer wall and the edge. Further, the welded portion includes an outer wall mating surface, an inner wall mating surface, a first outer wall inner wall mating surface, and a second outer wall inner wall mating surface. Therefore, the welding between the edge of the first outer wall and the edge of the second outer wall, the welding of the edge of the first inner wall and the edge of the second inner wall, and the welding of the outer wall and the inner wall are performed. It is possible to do it at the same time.

上記目的を達成するために、請求項１０に記載の技術は、請求項９に記載の技術において、溶着部の一部分には、第１外壁体の縁部と第２内壁体の縁部が接する第１外壁内壁接触面が設けられ、溶着部の他の一部分には、第２外壁体の縁部と第１内壁体の縁部とが接する第２外壁内壁接触面とが設けられることを趣旨とする。 In order to achieve the above object, the technique according to claim 10 is the technique according to claim 9, wherein the edge portion of the first outer wall body and the edge portion of the second inner wall body are in contact with a part of the welded portion. It is intended that the first outer wall inner wall contact surface is provided, and the other part of the welded portion is provided with a second outer wall inner wall contact surface in which the edge portion of the second outer wall body and the edge portion of the first inner wall body are in contact with each other. And.

上記技術の構成によれば、請求項９に記載の技術の作用に加え、溶着部の一部分には、第１外壁体の縁部と第２内壁体の縁部が接する第１外壁内壁接触面が設けられ、溶着部の他の一部分には、第２外壁体の縁部と第１内壁体の縁部とが接する第２外壁内壁接触面とが設けられる。従って、内壁の外壁に対する保持強度が増す。 According to the configuration of the above technique, in addition to the operation of the technique according to claim 9, a part of the welded portion is a contact surface of the inner wall of the first outer wall in which the edge portion of the first outer wall body and the edge portion of the second inner wall body are in contact with each other. Is provided, and the other part of the welded portion is provided with a second outer wall inner wall contact surface in which the edge portion of the second outer wall body and the edge portion of the first inner wall body are in contact with each other. Therefore, the holding strength of the inner wall with respect to the outer wall is increased.

上記目的を達成するために、請求項１１に記載の技術は、請求項２乃至１０のいずれかに記載の技術において、外壁及び内壁のうち少なくとも一方に、外壁及び内壁のうち少なくとも一方を加熱するための加熱部が設けられることを趣旨とする。 In order to achieve the above object, the technique according to claim 11 heats at least one of the outer wall and the inner wall and at least one of the outer wall and the inner wall in the technique according to any one of claims 2 to 10. The purpose is to provide a heating unit for this purpose.

上記技術の構成によれば、請求項２乃至１０のいずれかに記載の技術の作用に加え、外壁及び内壁のうち少なくとも一方に、外壁及び内壁のうち少なくとも一方を加熱するための加熱部が設けられるので、加熱部の熱により内壁が速やかに暖められる。 According to the configuration of the above technique, in addition to the operation of the technique according to any one of claims 2 to 10, a heating portion for heating at least one of the outer wall and the inner wall is provided on at least one of the outer wall and the inner wall. Therefore, the inner wall is quickly warmed by the heat of the heating part.

請求項１に記載の技術によれば、ＥＧＲガス分配器の内部における保温性を向上させることができ、その内部での凝縮水の発生を抑制することができる。 According to the technique according to claim 1, the heat retention property inside the EGR gas distributor can be improved, and the generation of condensed water inside the EGR gas distributor can be suppressed.

請求項２に記載の技術によれば、請求項１に記載の技術の効果に加え、ＥＧＲガス分配器の内部における保温性を更に向上させることができ、その内部での凝縮水の発生を更に抑制することができる。 According to the technique according to claim 2, in addition to the effect of the technique according to claim 1, the heat retention property inside the EGR gas distributor can be further improved, and the generation of condensed water inside the EGR gas distributor can be further improved. It can be suppressed.

請求項３に記載の技術によれば、請求項２に記載の技術の効果に加え、薄肉化された内壁の加熱に要する熱量を低減することができ、これによって内壁の昇温効果を向上させることができ、もってＥＧＲガス分配器の内部での凝縮水の発生をより一層抑制することができる。また、中間層に凝縮水が溜まることを防止することができる。 According to the technique of claim 3, in addition to the effect of the technique of claim 2, the amount of heat required for heating the thinned inner wall can be reduced, thereby improving the effect of raising the temperature of the inner wall. Therefore, the generation of condensed water inside the EGR gas distributor can be further suppressed. In addition, it is possible to prevent condensed water from accumulating in the intermediate layer.

請求項４に記載の技術によれば、請求項２又は３に記載の技術の効果に加え、内壁の昇温効果を向上させることができ、もってＥＧＲガス分配器の内部での凝縮水の発生をより一層抑制することができる。 According to the technique according to claim 4, in addition to the effect of the technique according to claim 2 or 3, the effect of raising the temperature of the inner wall can be improved, so that condensed water is generated inside the EGR gas distributor. Can be further suppressed.

請求項５に記載の技術によれば、請求項２又は３に記載の技術の効果に加え、ＥＧＲガス分配器の内部での凝縮水の発生をより一層抑制することができる。 According to the technique according to claim 5, in addition to the effect of the technique according to claim 2 or 3, the generation of condensed water inside the EGR gas distributor can be further suppressed.

請求項６に記載の技術によれば、請求項４又は５に記載の技術の効果に加え、内壁と外壁で構成されるＥＧＲガス分配器の耐久性を向上させることができる。 According to the technique of claim 6, in addition to the effect of the technique of claim 4 or 5, the durability of the EGR gas distributor composed of the inner wall and the outer wall can be improved.

請求項７に記載の技術によれば、請求項４又は５に記載の技術の効果に加え、内壁を外壁に対し比較的簡易な作業で保持することができる。このため、例えば、この保持構造（係合部）を、別の保持構造（溶着部）を施す前の仮止め手段として利用することもできる。 According to the technique according to claim 7, in addition to the effect of the technique according to claim 4 or 5, the inner wall can be held against the outer wall by a relatively simple operation. Therefore, for example, this holding structure (engagement portion) can be used as a temporary fixing means before applying another holding structure (welding portion).

請求項８に記載の技術によれば、請求項４又は５に記載の技術の効果に加え、内壁を外壁に対し比較的簡易な作業で保持することができる。このため、例えば、この保持構造（係合部）を、別の保持構造（溶着部）を施す前の仮止め手段として利用することもできる。 According to the technique of claim 8, in addition to the effect of the technique of claim 4 or 5, the inner wall can be held against the outer wall by a relatively simple operation. Therefore, for example, this holding structure (engagement portion) can be used as a temporary fixing means before applying another holding structure (welding portion).

請求項９に記載の技術によれば、請求項６に記載の技術の効果に加え、第１外壁体と第２外壁体との固定と、第１内壁体と第２内壁体との固定と、外壁に対する内壁の保持とを同時に実施することができる。 According to the technique of claim 9, in addition to the effect of the technique of claim 6, fixing of the first outer wall body and the second outer wall body and fixing of the first inner wall body and the second inner wall body , Holding the inner wall against the outer wall can be carried out at the same time.

請求項１０に記載の技術によれば、請求項９に記載の技術の効果に加え、内壁の外壁に対する保持耐久性を向上させることができる。 According to the technique of claim 10, in addition to the effect of the technique of claim 9, the holding durability of the inner wall with respect to the outer wall can be improved.

請求項１１に記載の技術によれば、請求項２乃至１０のいずれかに記載の技術の効果に加え、ＥＧＲガス分配器の内部を効率良く昇温させることができ、ＥＧＲガス分配器における凝縮水の発生を比較的早期に抑えることができる。 According to the technique according to claim 11, in addition to the effect of the technique according to any one of claims 2 to 10, the inside of the EGR gas distributor can be efficiently heated, and the condensation in the EGR gas distributor can be performed. The generation of water can be suppressed relatively early.

第１実施形態に係り、ＥＧＲガス分配器を備えた吸気マニホールドの概略を示す側面図。FIG. 5 is a side view showing an outline of an intake manifold provided with an EGR gas distributor according to the first embodiment. 第１実施形態に係り、ＥＧＲガス分配器を示す斜視図。FIG. 3 is a perspective view showing an EGR gas distributor according to the first embodiment. 第１実施形態に係り、ＥＧＲガス分配器を示す平面図。FIG. 5 is a plan view showing an EGR gas distributor according to the first embodiment. 第１実施形態に係り、ＥＧＲガス分配器を示す正面図。The front view which shows the EGR gas distributor according to 1st Embodiment. 第１実施形態に係り、ＥＧＲガス分配器を示す図３のＡ−Ａ線断面図。FIG. 3 is a sectional view taken along line AA of FIG. 3 showing an EGR gas distributor according to the first embodiment. 第１実施形態に係り、ＥＧＲガス分配器を上アッシと下アッシとに分解して示す斜視図。FIG. 5 is a perspective view showing the EGR gas distributor decomposed into an upper assy and a lower assy according to the first embodiment. 第１実施形態に係り、上アッシの内側を示す平面図。FIG. 5 is a plan view showing the inside of the upper assembly according to the first embodiment. 第１実施形態に係り、上アッシを示す図７のＢ−Ｂ線断面図。FIG. 7 is a cross-sectional view taken along the line BB of FIG. 7 showing an upper assembly according to the first embodiment. 第１実施形態に係り、切断した上アッシの一部を斜め上から視た斜視図。FIG. 5 is a perspective view of a part of the cut upper assy viewed from diagonally above according to the first embodiment. 第１実施形態に係り、切断した上アッシの一部を斜め下から視た斜視図。FIG. 5 is a perspective view of a part of the cut upper assy viewed from diagonally below according to the first embodiment. 第１実施形態に係り、上アッシを上外壁と上内壁とに分解して示す斜視図。FIG. 5 is a perspective view showing the upper assy disassembled into an upper outer wall and an upper inner wall according to the first embodiment. 第１実施形態に係り、上外壁の内側を示す平面図。FIG. 5 is a plan view showing the inside of the upper outer wall according to the first embodiment. 第１実施形態に係り、上外壁を示す図１２のＣ−Ｃ線断面図。FIG. 12 is a sectional view taken along line CC of FIG. 12 showing an upper outer wall according to the first embodiment. 第１実施形態に係り、切断した上外壁の一部を斜め上から視た斜視図。FIG. 5 is a perspective view of a part of the cut upper outer wall viewed from diagonally above according to the first embodiment. 第１実施形態に係り、切断した上外壁の一部を斜め下から視た斜視図。FIG. 5 is a perspective view of a part of the cut upper outer wall viewed from diagonally below according to the first embodiment. 第１実施形態に係り、上内壁の内側を示す平面図。FIG. 5 is a plan view showing the inside of the upper inner wall according to the first embodiment. 第１実施形態に係り、上内壁を示す図１６のＤ−Ｄ線断面図。FIG. 16 is a sectional view taken along line DD of FIG. 16 showing an upper inner wall according to the first embodiment. 第１実施形態に係り、切断した上内壁の一部を斜め上から視た斜視図。FIG. 5 is a perspective view of a part of the cut upper inner wall viewed from diagonally above according to the first embodiment. 第１実施形態に係り、切断した上内壁の一部を斜め下から視た斜視図。FIG. 5 is a perspective view of a part of the cut upper inner wall viewed from diagonally below according to the first embodiment. 第１実施形態に係り、下アッシの内側を示す平面図。FIG. 5 is a plan view showing the inside of the lower assembly according to the first embodiment. 第１実施形態に係り、下アッシを示す図２０のＥ−Ｅ線断面図。FIG. 20 is a sectional view taken along line EE of FIG. 20 showing a lower assembly according to the first embodiment. 第１実施形態に係り、下アッシを示す図２０のＦ−Ｆ線断面図。FIG. 20 is a sectional view taken along line FF of FIG. 20 showing a lower assembly according to the first embodiment. 第１実施形態に係り、下アッシを示す図２０のＧ−Ｇ線断面図（一部）。FIG. 20 is a cross-sectional view taken along the line GG of FIG. 20 showing a lower assembly according to the first embodiment. 第１実施形態に係り、下アッシを下外壁と下内壁とに分解して示す斜視図。FIG. 5 is a perspective view showing the lower assy disassembled into a lower outer wall and a lower inner wall according to the first embodiment. 第１実施形態に係り、下外壁の内側を示す平面図。FIG. 5 is a plan view showing the inside of the lower outer wall according to the first embodiment. 第１実施形態に係り、下外壁を示す図２５のＨ−Ｈ線断面図。FIG. 25 is a sectional view taken along line HH of FIG. 25 showing a lower outer wall according to the first embodiment. 第１実施形態に係り、下外壁の内側を示す斜視図。A perspective view showing the inside of the lower outer wall according to the first embodiment. 第１実施形態に係り、下内壁の内側を示す平面図。FIG. 5 is a plan view showing the inside of the lower inner wall according to the first embodiment. 第１実施形態に係り、下内壁を示す図２８のＩ−Ｉ線断面図。FIG. 28 is a sectional view taken along line II of FIG. 28 showing a lower inner wall according to the first embodiment. 第１実施形態に係り、図５のガスチャンバの部分を模式的に示す断面図。FIG. 5 is a cross-sectional view schematically showing a portion of the gas chamber of FIG. 5 according to the first embodiment. 第１実施形態に係り、図３０の鎖線円（Ｓ１）の部分を示す拡大断面図。FIG. 5 is an enlarged cross-sectional view showing a portion of the chain line circle (S1) of FIG. 30 according to the first embodiment. 第１実施形態に係り、図３０の鎖線円（Ｓ２）の部分を示す拡大断面図。FIG. 5 is an enlarged cross-sectional view showing a portion of the chain line circle (S2) of FIG. 30 according to the first embodiment. 第２実施形態に係り、ＥＧＲガス分配器を示す斜視図。FIG. 5 is a perspective view showing an EGR gas distributor according to a second embodiment. 第２実施形態に係り、ＥＧＲガス分配器を示す平面図。FIG. 2 is a plan view showing an EGR gas distributor according to a second embodiment. 第２実施形態に係り、ＥＧＲガス分配器を示す正面図。The front view which shows the EGR gas distributor according to the 2nd Embodiment. 第２実施形態に係り、ＥＧＲガス分配器を示す図３４のＪ−Ｊ線断面図。FIG. 34 is a sectional view taken along line JJ of FIG. 34 showing an EGR gas distributor according to a second embodiment. 別の実施形態に係り、ＥＧＲガス分配器を示す図５に準ずる断面図。FIG. 5 is a cross-sectional view according to FIG. 5 showing an EGR gas distributor according to another embodiment. 別の実施形態に係り、ガスチャンバの部分を模式的に示す図３０に準ずる断面図。FIG. 30 is a cross-sectional view schematically showing a portion of a gas chamber according to another embodiment.

以下、ＥＧＲガス分配器を具体化したいくつかの実施形態につき図面を参照して詳細に説明する。 Hereinafter, some embodiments embodying the EGR gas distributor will be described in detail with reference to the drawings.

＜第１実施形態＞
先ず、第１実施形態について説明する。 <First Embodiment>
First, the first embodiment will be described.

[ＥＧＲガス分配器と吸気マニホールドについて]
図１に、この実施形態に係り、ＥＧＲガス分配器１を備えた吸気マニホールド２の概略を側面図により示す。図１に示す状態が、車両にてエンジンに取り付けられた吸気マニホールド２の配置状態を示し、その上下は図１に示す通りである。吸気マニホールド２は、サージタンク３と、サージタンク３から分岐した複数の分岐管４（一つのみ図示する）と、各分岐管４の出口をエンジンへ接続するための出口フランジ５とを備える。この実施形態で、吸気マニホールド２は、４気筒のエンジンに対応した４つの分岐管４を有する。この実施形態で、ＥＧＲガス分配器１は、各分岐管４のそれぞれへＥＧＲガスを分配するために、出口フランジ５の近傍にて、各分岐管４の上側に設けられる。 [About EGR gas distributor and intake manifold]
FIG. 1 shows a schematic side view of an intake manifold 2 provided with an EGR gas distributor 1 according to this embodiment. The state shown in FIG. 1 shows the arrangement state of the intake manifold 2 attached to the engine in the vehicle, and the upper and lower parts thereof are as shown in FIG. The intake manifold 2 includes a surge tank 3, a plurality of branch pipes 4 (only one is shown) branched from the surge tank 3, and an outlet flange 5 for connecting the outlet of each branch pipe 4 to the engine. In this embodiment, the intake manifold 2 has four branch pipes 4 corresponding to a four-cylinder engine. In this embodiment, the EGR gas distributor 1 is provided on the upper side of each branch pipe 4 in the vicinity of the outlet flange 5 in order to distribute the EGR gas to each of the branch pipes 4.

[ＥＧＲガス分配器の概要について]
図２に、ＥＧＲガス分配器１を斜視図により示す。図３に、ＥＧＲガス分配器１を平面図により示す。図４に、ＥＧＲガス分配器１を正面図により示す。図５に、ＥＧＲガス分配器１を、図３のＡ−Ａ線断面図により示す。図１〜図５に示す吸気マニホールド２とＥＧＲガス分配器１の外観や構造は、本開示技術の一例を示すものである。 [Overview of EGR gas distributor]
FIG. 2 shows the EGR gas distributor 1 in a perspective view. FIG. 3 shows the EGR gas distributor 1 in a plan view. FIG. 4 shows the EGR gas distributor 1 in a front view. FIG. 5 shows the EGR gas distributor 1 with a cross-sectional view taken along the line AA of FIG. The appearance and structure of the intake manifold 2 and the EGR gas distributor 1 shown in FIGS. 1 to 5 show an example of the disclosed technology.

図２〜図５に示すように、ＥＧＲガス分配器１は、全体として横長な形状を有し、その長手方向Ｘにおいて、吸気マニホールド２の複数の分岐管４を横切るように配置される。ＥＧＲガス分配器１は、予め吸気マニホールド２とは別に形成され、吸気マニホールド２に対し後付けされる。図２、図３に示すように、ＥＧＲガス分配器１は、大きく分けて三つの部分、すなわち、ガス入口１１を含むガス導入通路１２と、ガス導入通路１２に連通するガスチャンバ１３と、ガスチャンバ１３から分岐され、各分岐管４にそれぞれ連通する複数（４つ）のガス分配通路１４Ａ，１４Ｂ，１４Ｃ，１４Ｄとから構成される。 As shown in FIGS. 2 to 5, the EGR gas distributor 1 has a horizontally long shape as a whole, and is arranged so as to cross a plurality of branch pipes 4 of the intake manifold 2 in the longitudinal direction X thereof. The EGR gas distributor 1 is formed in advance separately from the intake manifold 2 and is retrofitted to the intake manifold 2. As shown in FIGS. 2 and 3, the EGR gas distributor 1 is roughly divided into three parts, that is, a gas introduction passage 12 including a gas inlet 11, a gas chamber 13 communicating with the gas introduction passage 12, and a gas. It is composed of a plurality of (four) gas distribution passages 14A, 14B, 14C, and 14D that are branched from the chamber 13 and communicate with each branch pipe 4.

ガス入口１１には、ＥＧＲガスが導入される。ガス入口１１は、ＥＧＲ通路（図示略）に接続される。ガス入口１１の周囲には、ＥＧＲ通路を接続するための入口フランジ１１ａが形成される。ガス導入通路１２は、ガス入口１１から伸びる一つの通路部１２ａと、その通路部１２ａから二股に分岐した分岐通路部１２ｂ，１２ｃとを含む。ガス入口１１は、ＥＧＲガス分配器１の前側に開口する。一つの通路部１２ａは同分配器１の前側から後側へ回り込み、各分岐通路部１２ｂ，１２ｃに続く。ガスチャンバ１３は、横長な筒形状をなす。ガスチャンバ１３は、ガス入口１１からガス導入通路１２に導入されるＥＧＲガスを集める。複数のガス分配通路１４Ａ〜１４Ｄは、ガスチャンバ１３の前側にて、ガスチャンバ１３から分岐する。この実施形態で、各ガス分配通路１４Ａ〜１４Ｄは、ガスチャンバ１３から各分岐管４へ向けて斜め下方へ伸び、開口する。 EGR gas is introduced into the gas inlet 11. The gas inlet 11 is connected to an EGR passage (not shown). An inlet flange 11a for connecting the EGR passage is formed around the gas inlet 11. The gas introduction passage 12 includes one passage portion 12a extending from the gas inlet 11 and branch passage portions 12b and 12c bifurcated from the passage portion 12a. The gas inlet 11 opens to the front side of the EGR gas distributor 1. One passage portion 12a wraps around from the front side to the rear side of the distributor 1 and continues to the branch passage portions 12b and 12c. The gas chamber 13 has a horizontally long tubular shape. The gas chamber 13 collects the EGR gas introduced into the gas introduction passage 12 from the gas inlet 11. The plurality of gas distribution passages 14A to 14D branch from the gas chamber 13 on the front side of the gas chamber 13. In this embodiment, the gas distribution passages 14A to 14D extend obliquely downward from the gas chamber 13 toward each branch pipe 4 and open.

図５に示すように、ＥＧＲガス分配器１において、ガス導入通路１２及びガスチャンバ１３には、断熱層１５が設けられる。この実施形態で、ＥＧＲガス分配器１は、外壁１６と内壁１７とから構成される二重構造を備える。この実施形態で、外壁１６及び内壁１７は、それぞれ樹脂材により構成される。この実施形態で、内壁１７は、外壁１６に比べ薄肉に形成される。内壁１７の肉厚は、外壁１６の肉厚のほぼ半分に設定される。断熱層１５は、外壁１６と内壁１７との間の中間層１８を含む。この実施形態で、中間層１８は空気のみからなる空気層から構成される。 As shown in FIG. 5, in the EGR gas distributor 1, a heat insulating layer 15 is provided in the gas introduction passage 12 and the gas chamber 13. In this embodiment, the EGR gas distributor 1 has a double structure composed of an outer wall 16 and an inner wall 17. In this embodiment, the outer wall 16 and the inner wall 17 are each made of a resin material. In this embodiment, the inner wall 17 is formed to be thinner than the outer wall 16. The wall thickness of the inner wall 17 is set to be substantially half of the wall thickness of the outer wall 16. The heat insulating layer 15 includes an intermediate layer 18 between the outer wall 16 and the inner wall 17. In this embodiment, the intermediate layer 18 is composed of an air layer composed of only air.

ここで、図５に示すように、外壁１６は、上外壁１６Ａと下外壁１６Ｂとの二つの部材に分割して構成される。また、内壁１７は、上内壁１７Ａと下内壁１７Ｂとの二つの部材に分割して構成される。図６には、ＥＧＲガス分配器１を、上アッシ２１と下アッシ２２とに分解して斜視図により示す。上アッシ２１は、上外壁１６Ａと上内壁１７Ａとを含む。上外壁１６Ａの外周には、上外壁フランジ１９ａが形成され、上内壁１７Ａの外周には、上内壁フランジ２０ａが形成される。下アッシ２２は、下外壁１６Ｂと下内壁１７Ｂとを含む。下外壁１６Ｂの外周には、下外壁フランジ１９ｂが形成され、下内壁１７Ｂの外周には、下内壁フランジ２０ｂが形成される。図５において、鎖線円Ｓ１〜Ｓ４で囲む部分において、外壁１６と内壁１７との間には、内壁１７を外壁１６に保持するための第１保持構造３１が設けられる。この第１保持構造３１の構造については後述する。この実施形態で、上外壁１６Ａは、この開示技術における第１外壁体に相当し、下外壁１６Ｂは、この開示技術における第２外壁体に相当する。上外壁フランジ１９ａは、第１外壁体の縁部に相当し、下外壁フランジ１９ｂは、第２外壁体の縁部に相当する。また、上内壁１７Ａは、この開示技術における第１内壁体に相当し、下内壁１７Ｂは、この開示技術における第２内壁体に相当する。上内壁フランジ２０ａは、第１内壁体の縁部に相当し、下内壁フランジ２０ｂは、第２内壁体の縁部に相当する。 Here, as shown in FIG. 5, the outer wall 16 is divided into two members, an upper outer wall 16A and a lower outer wall 16B. Further, the inner wall 17 is divided into two members, an upper inner wall 17A and a lower inner wall 17B. FIG. 6 shows the EGR gas distributor 1 disassembled into an upper assembly 21 and a lower assembly 22 in a perspective view. The upper assembly 21 includes an upper outer wall 16A and an upper inner wall 17A. An upper outer wall flange 19a is formed on the outer periphery of the upper outer wall 16A, and an upper inner wall flange 20a is formed on the outer periphery of the upper inner wall 17A. The lower assembly 22 includes a lower outer wall 16B and a lower inner wall 17B. A lower outer wall flange 19b is formed on the outer periphery of the lower outer wall 16B, and a lower inner wall flange 20b is formed on the outer periphery of the lower inner wall 17B. In FIG. 5, in the portion surrounded by the chain line circles S1 to S4, a first holding structure 31 for holding the inner wall 17 on the outer wall 16 is provided between the outer wall 16 and the inner wall 17. The structure of the first holding structure 31 will be described later. In this embodiment, the upper outer wall 16A corresponds to the first outer wall body in the disclosed technology, and the lower outer wall 16B corresponds to the second outer wall body in the disclosed technology. The upper outer wall flange 19a corresponds to the edge portion of the first outer wall body, and the lower outer wall flange 19b corresponds to the edge portion of the second outer wall body. Further, the upper inner wall 17A corresponds to the first inner wall body in the disclosed technology, and the lower inner wall 17B corresponds to the second inner wall body in the disclosed technology. The upper inner wall flange 20a corresponds to the edge portion of the first inner wall body, and the lower inner wall flange 20b corresponds to the edge portion of the second inner wall body.

［上アッシについて］
図７に、上アッシ２１の内側を平面図により示す。図８に、上アッシ２１を、図７のＢ−Ｂ線断面図により示す。図９に、切断した上アッシ２１の一部を斜め上から視た斜視図により示す。図１０に、同じく切断した上アッシ２１の一部を斜め下から視た斜視図により示す。図７〜図１０に示すように、上外壁１６Ａの内側は、ガス導入通路１２及びガスチャンバ１３を構成する部分のほぼ全てが、上内壁１７Ａにより覆われる。 [About the upper assembly]
FIG. 7 shows the inside of the upper assembly 21 in a plan view. FIG. 8 shows the upper assembly 21 with a cross-sectional view taken along the line BB of FIG. FIG. 9 shows a part of the cut upper assy 21 as a perspective view seen from diagonally above. FIG. 10 shows a part of the similarly cut upper assy 21 as a perspective view seen from diagonally below. As shown in FIGS. 7 to 10, the inside of the upper outer wall 16A is covered with almost all of the portions constituting the gas introduction passage 12 and the gas chamber 13 by the upper inner wall 17A.

図１１に、上アッシ２１を上外壁１６Ａと上内壁１７Ａとに分解した斜視図により示す。図１２に、上外壁１６Ａの内側を平面図により示す。図１３に、上外壁１６Ａを、図１２のＣ−Ｃ線断面図により示す。図１４に、切断した上外壁１６Ａの一部を斜め上から視た斜視図により示す。図１５に、同じく切断した上外壁１６Ａの一部を斜め下から視た斜視図により示す。図１６に、上内壁１７Ａの内側を平面図により示す。図１７に、上内壁１７Ａを、図１６のＤ−Ｄ線断面図により示す。図１８に、切断した上内壁１７Ａの一部を斜め上から視た斜視図により示す。図１９に、同じく切断した上内壁１７Ａの一部を斜め下から視た斜視図により示す。 FIG. 11 shows a perspective view of the upper assy 21 disassembled into an upper outer wall 16A and an upper inner wall 17A. FIG. 12 shows the inside of the upper outer wall 16A in a plan view. FIG. 13 shows the upper outer wall 16A with a cross-sectional view taken along the line CC of FIG. FIG. 14 shows a part of the cut upper outer wall 16A as a perspective view seen from diagonally above. FIG. 15 shows a part of the similarly cut upper outer wall 16A as a perspective view seen from diagonally below. FIG. 16 shows the inside of the upper inner wall 17A in a plan view. FIG. 17 shows the upper inner wall 17A with a cross-sectional view taken along the line DD of FIG. FIG. 18 shows a part of the cut upper inner wall 17A as a perspective view seen from diagonally above. FIG. 19 shows a part of the similarly cut upper inner wall 17A as a perspective view seen from diagonally below.

図９、図１０に示すように、上アッシ２１には、上内壁１７Ａを上外壁１６Ａに保持するための第２保持構造３２が設けられる。この実施形態で、第２保持構造３２は、スナップフィット２３により構成される。スナップフィット２３は、上アッシ２１の適所に複数設けられる。すなわち、図１２〜図１５に示すように、上外壁１６Ａには、その適所にスナップフィット２３を構成する複数の係合爪２３ａが形成される。これら係合爪２３ａに対応して、図１１、図１７〜図１９に示すように、上内壁１７Ａの適所には、スナップフィット２３を構成する複数の係合孔２３ｂが形成される。そして、図９、図１０に示すように、これら係合爪２３ａが対応する係合孔２３ｂに係合可能となっている。この係合により、上内壁１７Ａが上外壁１６Ａに対し固定され、保持される。この実施形態で、スナップフィット２３は、本開示技術の係合部に相当する。また、係合爪２３ａは、この開示技術の凸部に相当し、係合孔２３ｂは、この開示技術の凹部に相当する。また、係合孔２３ｂは、上内壁１７Ａに設けられ、中間層１８に連通する本開示技術の連通孔２４にも相当する。 As shown in FIGS. 9 and 10, the upper assy 21 is provided with a second holding structure 32 for holding the upper inner wall 17A on the upper outer wall 16A. In this embodiment, the second holding structure 32 is configured by the snap fit 23. A plurality of snap fits 23 are provided at appropriate positions on the upper assembly 21. That is, as shown in FIGS. 12 to 15, a plurality of engaging claws 23a forming the snap fit 23 are formed at appropriate positions on the upper outer wall 16A. Corresponding to these engaging claws 23a, as shown in FIGS. 11 and 17 to 19, a plurality of engaging holes 23b forming the snap fit 23 are formed at appropriate positions on the upper inner wall 17A. Then, as shown in FIGS. 9 and 10, these engaging claws 23a can engage with the corresponding engaging holes 23b. By this engagement, the upper inner wall 17A is fixed and held with respect to the upper outer wall 16A. In this embodiment, the snap fit 23 corresponds to the engaging portion of the disclosed technology. Further, the engaging claw 23a corresponds to the convex portion of the disclosed technology, and the engaging hole 23b corresponds to the concave portion of the disclosed technology. Further, the engagement hole 23b is provided in the upper inner wall 17A and corresponds to the communication hole 24 of the present disclosure technology that communicates with the intermediate layer 18.

［下アッシについて］
図２０に、下アッシ２２の内側を平面図により示す。図２１に、下アッシ２２を、図２０のＥ−Ｅ線断面図により示す。図２２に、下アッシ２２を、図２０のＦ−Ｆ線断面図により示す。図２３に、下アッシ２２を、図２０のＧ−Ｇ線断面図（一部）により示す。図２０〜図２３に示すように、下外壁１６Ｂの内側は、ガス導入通路１２とガスチャンバ１３を構成する部分のほぼ全てが下内壁１７Ｂにより覆われる。図２４に、下アッシ２２を下外壁１６Ｂと下内壁１７Ｂとに分解した斜視図により示す。図２５に、下外壁１６Ｂの内側を平面図により示す。図２６に、下外壁１６Ｂを、図２５のＨ−Ｈ線断面図により示す。図２７に、下外壁１６Ｂの内側を斜視図により示す。図２８に、下内壁１７Ｂの内側を平面図により示す。図２９に、下内壁１７Ｂを、図２８のＩ−Ｉ線断面図により示す。 [About the lower assembly]
FIG. 20 shows the inside of the lower assembly 22 in a plan view. FIG. 21 shows the lower assembly 22 with a cross-sectional view taken along the line EE of FIG. FIG. 22 shows the lower assembly 22 with a cross-sectional view taken along the line FF of FIG. FIG. 23 shows the lower assembly 22 with a cross-sectional view taken along the line GG of FIG. 20 (part). As shown in FIGS. 20 to 23, the inside of the lower outer wall 16B is covered with almost all of the portions constituting the gas introduction passage 12 and the gas chamber 13 by the lower inner wall 17B. FIG. 24 is a perspective view of the lower assy 22 disassembled into a lower outer wall 16B and a lower inner wall 17B. FIG. 25 shows the inside of the lower outer wall 16B in a plan view. FIG. 26 shows the lower outer wall 16B by the cross-sectional view taken along the line HH of FIG. 25. FIG. 27 shows the inside of the lower outer wall 16B by a perspective view. FIG. 28 shows the inside of the lower inner wall 17B in a plan view. FIG. 29 shows the lower inner wall 17B with a cross-sectional view taken along the line II of FIG. 28.

図２０、図２２、図２３に示すように、下アッシ２２には、下内壁１７Ｂを下外壁１６Ｂに保持するための第３保持構造３３が設けられる。この実施形態で、第３保持構造３３は、下外壁１６Ｂの一部を下内壁１７Ｂにかしめるかしめ部２６により構成される。このかしめ部２６は、下アッシ２２の適所に複数設けられる。すなわち、図２０、図２２〜図２７に示すように、下外壁１６Ｂには、その適所にかしめ部２６を構成する複数の突起２６ａが形成される。かしめ部２６は、突起２６ａが加熱溶融により押し拡げられたものであり、かしめ前は突起２６ａと同じ形状を有する。これら突起２６ａに対応して、図２４、図２８に示すように、下内壁１７Ｂの適所には、突起２６ａを貫通させる複数の貫通孔２６ｂが形成される。そして、これら突起２６ａを対応する貫通孔２６ｂに貫通させ、貫通した突起２６ａの頭部を加熱溶融により押し拡げ、下内壁１７Ｂを下外壁１６Ｂにかしめる。このかしめにより、下内壁１７Ｂが下外壁１６Ｂの内側に対し固定され、保持される。この実施形態では、複数の突起２６ａのうち、かしめ部２６となるのは、一部であり、残りのかしめられない突起２６ａは、下外壁１６Ｂに対する下内壁１７Ｂの位置決め手段として機能する。ここで、複数の貫通孔２６ｂの内径は、突起２６ａの外径より若干大きく形成される。このため、貫通孔２６ｂに突起２６ａを貫通させた状態では、貫通孔２６ｂと突起２６ａとの間に隙間が形成される。この隙間も、下内壁１７Ｂに設けられ、中間層１８に連通する本開示技術の連通孔に相当する。 As shown in FIGS. 20, 22, and 23, the lower assy 22 is provided with a third holding structure 33 for holding the lower inner wall 17B to the lower outer wall 16B. In this embodiment, the third holding structure 33 is composed of a caulking portion 26 that crimps a part of the lower outer wall 16B to the lower inner wall 17B. A plurality of the caulking portions 26 are provided at appropriate positions in the lower assy 22. That is, as shown in FIGS. 20 and 22 to 27, a plurality of protrusions 26a forming the caulking portion 26 are formed at appropriate positions on the lower outer wall 16B. The caulking portion 26 is formed by expanding the protrusion 26a by heating and melting, and has the same shape as the protrusion 26a before caulking. Corresponding to these protrusions 26a, as shown in FIGS. 24 and 28, a plurality of through holes 26b through which the protrusions 26a are penetrated are formed at appropriate positions on the lower inner wall 17B. Then, these protrusions 26a are passed through the corresponding through holes 26b, the head of the penetrating protrusions 26a is expanded by heating and melting, and the lower inner wall 17B is crimped to the lower outer wall 16B. By this caulking, the lower inner wall 17B is fixed and held with respect to the inside of the lower outer wall 16B. In this embodiment, of the plurality of protrusions 26a, only a part of the protrusions 26a is the crimped portion 26, and the remaining non-crimped protrusions 26a function as means for positioning the lower inner wall 17B with respect to the lower outer wall 16B. Here, the inner diameter of the plurality of through holes 26b is formed to be slightly larger than the outer diameter of the protrusion 26a. Therefore, in a state where the protrusion 26a is passed through the through hole 26b, a gap is formed between the through hole 26b and the protrusion 26a. This gap is also provided in the lower inner wall 17B and corresponds to a communication hole of the present disclosure technology that communicates with the intermediate layer 18.

図２０〜図２４、図２８、図２９に示すように、下内壁１７Ｂのうち、下外壁１６Ｂに設けられる各ガス分配通路１４Ａ〜１４Ｄに対応する部分には、それらガス分配通路１４Ａ〜１４Ｄに連通する連通孔２７が形成される。これら連通孔２７は、断熱層１５（中間層１８）にも連通する。また、図２３〜図２７に示すように、下外壁１６Ｂのガスチャンバ１３を構成する部分には、各ガス分配通路１４Ａ〜１４Ｄの入口の間を区画する複数（３つ）のリブ２８が形成される。これらリブ２８は、下外壁１６Ｂと下内壁１７Ｂとの間に隙間を確保すると共に、その隙間で発生した凝縮水の長手方向Ｘへの移動を制限し、各ガス分配通路１４Ａ〜１４Ｄへ凝縮水を均等に分配するようになっている。 As shown in FIGS. 20 to 24, 28, and 29, of the lower inner wall 17B, the portions corresponding to the gas distribution passages 14A to 14D provided on the lower outer wall 16B are provided with the gas distribution passages 14A to 14D. A communication hole 27 for communication is formed. These communication holes 27 also communicate with the heat insulating layer 15 (intermediate layer 18). Further, as shown in FIGS. 23 to 27, a plurality of (three) ribs 28 for partitioning between the inlets of the gas distribution passages 14A to 14D are formed in the portion of the lower outer wall 16B constituting the gas chamber 13. Will be done. These ribs 28 secure a gap between the lower outer wall 16B and the lower inner wall 17B, restrict the movement of the condensed water generated in the gap in the longitudinal direction X, and condense water to the gas distribution passages 14A to 14D. Is evenly distributed.

[第１保持構造について]
ここで、このＥＧＲガス分配器１につき、前述した第１保持構造３１について説明する。図３０に、図５のガスチャンバ１３の部分を模式的な断面図により示す。図３１に、図３０の鎖線円Ｓ１の部分を拡大断面図により示す。図３２に、図３０の鎖線円Ｓ２の部分を拡大断面図により示す。この実施形態で、第１保持構造３１は、樹脂材の振動溶着による溶着部３６により構成される。図３１、図３２に示すように、この溶着部３６は、上外壁フランジ１９ａと下外壁フランジ１９ｂとの外壁合わせ面４１（太い波線で示す部分）と、上内壁フランジ２０ａと下内壁フランジ２０ｂとの内壁合わせ面４２（波線で示す部分）と、上外壁フランジ１９ａと上内壁フランジ２０ａとの第１外壁内壁合わせ面４３（二点鎖線で示す部分）と、下外壁フランジ１９ｂと下内壁フランジ２０ｂとの第２外壁内壁合わせ面４４（太い二点鎖線で示す部分）とを含む。また、この溶着部３６において、上内壁フランジ２０ａと下内壁フランジ２０ｂは、上外壁フランジ１９ａと下外壁フランジ１９ｂとの間に挟まれている。 [About the first holding structure]
Here, the above-mentioned first holding structure 31 will be described with respect to the EGR gas distributor 1. FIG. 30 shows a portion of the gas chamber 13 of FIG. 5 in a schematic cross-sectional view. FIG. 31 shows a portion of the chain line circle S1 in FIG. 30 with an enlarged cross-sectional view. FIG. 32 shows a portion of the chain line circle S2 in FIG. 30 with an enlarged cross-sectional view. In this embodiment, the first holding structure 31 is composed of a welded portion 36 by vibration welding of a resin material. As shown in FIGS. 31 and 32, the welded portion 36 includes an outer wall mating surface 41 (a portion indicated by a thick wavy line) between the upper outer wall flange 19a and the lower outer wall flange 19b, and the upper inner wall flange 20a and the lower inner wall flange 20b. The inner wall mating surface 42 (the portion indicated by the wavy line), the first outer wall inner wall mating surface 43 (the portion indicated by the alternate long and short dash line) of the upper outer wall flange 19a and the upper inner wall flange 20a, and the lower outer wall flange 19b and the lower inner wall flange 20b. Includes the second outer wall inner wall mating surface 44 (the portion indicated by the thick alternate long and short dash line). Further, in the welded portion 36, the upper inner wall flange 20a and the lower inner wall flange 20b are sandwiched between the upper outer wall flange 19a and the lower outer wall flange 19b.

また、この実施形態では、第１保持構造３１（溶着部３６）の一部分には、図３１に示すように、外壁合わせ面４１と内壁合わせ面４２との間にて、上外壁フランジ１９ａと下内壁フランジ２０ｂが接する第１外壁内壁接触面４５（太い破線で示す部分）が設けられ、溶着部３６の他の一部分には、図３２に示すように、外壁合わせ面４１と内壁合わせ面４２との間にて、下外壁フランジ１９ｂと上内壁フランジ２０ａとが接する第２外壁内壁接触面４６（太い破線で示す部分）とが設けられる。これら外壁内壁接触面４５，４６は、上外壁フランジ１９ａと下外壁フランジ１９ｂの合わせ面の重なりと、上内壁フランジ２０ａと下内壁フランジ２０ｂの合わせ面の重なりとを相互にずらすことで構成することができる。 Further, in this embodiment, as shown in FIG. 31, a part of the first holding structure 31 (welded portion 36) has an upper outer wall flange 19a and a lower portion between the outer wall mating surface 41 and the inner wall mating surface 42. The first outer wall inner wall contact surface 45 (the portion indicated by the thick broken line) to which the inner wall flange 20b is in contact is provided, and the other part of the welded portion 36 includes the outer wall mating surface 41 and the inner wall mating surface 42 as shown in FIG. A second outer wall inner wall contact surface 46 (a portion indicated by a thick broken line) where the lower outer wall flange 19b and the upper inner wall flange 20a are in contact with each other is provided between them. These outer wall inner wall contact surfaces 45 and 46 are configured by mutually shifting the overlap of the mating surfaces of the upper outer wall flange 19a and the lower outer wall flange 19b and the mating surfaces of the upper inner wall flange 20a and the lower inner wall flange 20b. Can be done.

図３０〜図３２では、図５のガスチャンバ１３に対応する部分につき、第１保持構造３１を説明したが、図５のガス導入通路１２に対応する部分についても、同様の第１保持構造を備えるものとする。 In FIGS. 30 to 32, the first holding structure 31 has been described for the portion corresponding to the gas chamber 13 of FIG. 5, but the same first holding structure is also provided for the portion corresponding to the gas introduction passage 12 of FIG. Be prepared.

［ＥＧＲガス分配器の作用及び効果］
以上説明したこの実施形態のＥＧＲガス分配器１の構成によれば、ガス入口１１からガス導入通路１２に導入されるＥＧＲガスは、ガスチャンバ１３に集合し、複数のガス分配通路１４Ａ〜１４Ｄから、吸気マニホールド２の複数の分岐管４のそれぞれへ分配される。ここで、ＥＧＲガス分配器１のガスチャンバ１３及びガス導入通路１２には、断熱層１５が設けられるので、ガスチャンバ１３及びガス導入通路１２から外部への放熱が抑えられる。このため、ＥＧＲガス分配器１の内部における保温性を向上させることができ、その内部での凝縮水の発生を抑制することができる。特に、この実施形態では、断熱層１５が、外壁１６と内壁１７との間の中間層１８（空気層）を含むので、ガスチャンバ１３及びガス導入通路１２から外部への放熱が効果的に抑えられる。この意味で、ＥＧＲガス分配器１の内部における保温性を更に向上させることができ、その内部での凝縮水の発生を更に抑制することができる。 [Action and effect of EGR gas distributor]
According to the configuration of the EGR gas distributor 1 of this embodiment described above, the EGR gas introduced into the gas introduction passage 12 from the gas inlet 11 collects in the gas chamber 13 and is collected from the plurality of gas distribution passages 14A to 14D. , It is distributed to each of the plurality of branch pipes 4 of the intake manifold 2. Here, since the heat insulating layer 15 is provided in the gas chamber 13 and the gas introduction passage 12 of the EGR gas distributor 1, heat dissipation from the gas chamber 13 and the gas introduction passage 12 to the outside is suppressed. Therefore, the heat retention property inside the EGR gas distributor 1 can be improved, and the generation of condensed water inside the EGR gas distributor 1 can be suppressed. In particular, in this embodiment, since the heat insulating layer 15 includes an intermediate layer 18 (air layer) between the outer wall 16 and the inner wall 17, heat dissipation from the gas chamber 13 and the gas introduction passage 12 to the outside is effectively suppressed. Be done. In this sense, the heat retention property inside the EGR gas distributor 1 can be further improved, and the generation of condensed water inside the EGR gas distributor 1 can be further suppressed.

この実施形態の構成によれば、内壁１７は、中間層１８（空気層）に連通する連通孔２４，２７を含むので、連通孔２４，２７を通じて内壁１７の中と中間層１８（空気層）との間の圧力差が無くなり、内壁１７の薄肉化が許容される。このため、薄肉化された内壁１７の加熱に要する熱量を低減することができ、これによって内壁１７の昇温効果を向上させることができ、もってＥＧＲガス分配器１の内部での凝縮水の発生をより一層抑制することができる。また、中間層１８（空気層）で凝縮水が生じたとしても、その凝縮水を内壁１７の中へ排出することが可能となる。このため、中間層１８（空気層）に凝縮水が溜まることを防止することができる。なお、内壁１７の中へ排出された凝縮水は、ＥＧＲガスと共に各ガス分配通路１４Ａ〜１４Ｄを介して各分岐管４へ排出されることになるが、凝縮水のエンジンへの影響は少ないと考えられる。 According to the configuration of this embodiment, since the inner wall 17 includes communication holes 24 and 27 communicating with the intermediate layer 18 (air layer), the inside of the inner wall 17 and the intermediate layer 18 (air layer) through the communication holes 24 and 27. The pressure difference between the two and the inner wall 17 is eliminated, and the inner wall 17 is allowed to be thinned. Therefore, the amount of heat required for heating the thinned inner wall 17 can be reduced, thereby improving the effect of raising the temperature of the inner wall 17, and thus the generation of condensed water inside the EGR gas distributor 1. Can be further suppressed. Further, even if condensed water is generated in the intermediate layer 18 (air layer), the condensed water can be discharged into the inner wall 17. Therefore, it is possible to prevent the condensed water from accumulating in the intermediate layer 18 (air layer). The condensed water discharged into the inner wall 17 is discharged to each branch pipe 4 through the gas distribution passages 14A to 14D together with the EGR gas, but the effect of the condensed water on the engine is small. Conceivable.

この実施形態の構成によれば、外壁１６と内壁１７の両方が樹脂材により構成されるので、内壁１７に対する外気温の影響が効果的に抑えられる。このため、ＥＧＲガス分配器１の内部での凝縮水の発生をより一層抑制することができる。 According to the configuration of this embodiment, since both the outer wall 16 and the inner wall 17 are made of a resin material, the influence of the outside air temperature on the inner wall 17 can be effectively suppressed. Therefore, the generation of condensed water inside the EGR gas distributor 1 can be further suppressed.

この実施形態の構成によれば、内壁１７を外壁１６に保持するための第１保持構造３１が、樹脂材の溶着による溶着部３６により構成されるので、内壁１７を外壁１６に対し十分な強度で保持することが可能となる。このため、内壁１７と外壁１６で構成されるＥＧＲガス分配器１の耐久性を向上させることができる。 According to the configuration of this embodiment, since the first holding structure 31 for holding the inner wall 17 on the outer wall 16 is composed of the welded portion 36 by welding the resin material, the inner wall 17 has sufficient strength with respect to the outer wall 16. It is possible to hold it with. Therefore, the durability of the EGR gas distributor 1 composed of the inner wall 17 and the outer wall 16 can be improved.

また、この実施形態の構成によれば、内壁１７を外壁１６に保持するための第２保持構造３２が、係合爪２３ａ（凸部）を係合孔２３ｂ（凹部）に係合させるスナップフィット２３（係合部）により構成されるので、内壁１７を外壁１６に対し比較的簡易に保持することが可能となる。このため、内壁１７を外壁１６に対し比較的簡易な作業で保持することができる。このため、特に、この実施形態では、第２保持構造３２を、第１保持構造３１（溶着部３６）を施す前の仮止め手段として利用することもできる。 Further, according to the configuration of this embodiment, the second holding structure 32 for holding the inner wall 17 on the outer wall 16 is a snap fit that engages the engaging claw 23a (convex portion) with the engaging hole 23b (concave portion). Since it is composed of 23 (engaging portion), the inner wall 17 can be held relatively easily with respect to the outer wall 16. Therefore, the inner wall 17 can be held with respect to the outer wall 16 with a relatively simple operation. Therefore, in particular, in this embodiment, the second holding structure 32 can be used as a temporary fixing means before applying the first holding structure 31 (welding portion 36).

この実施形態の構成によれば、内壁１７を外壁１６に保持するための第３保持構造３３が、外壁１６の一部を内壁１７にかしめるかしめ部２６により構成されるので、内壁１７を外壁１６に対し比較的簡易に保持することが可能となる。このため、内壁１７を外壁１６に対し比較的簡易な作業で保持することができる。このため、特に、この実施形態では、第３保持構造３３を、第１保持構造３１（溶着部３６）を施す前の仮止め手段として利用することもできる。 According to the configuration of this embodiment, the third holding structure 33 for holding the inner wall 17 to the outer wall 16 is composed of the caulking portion 26 that crimps a part of the outer wall 16 to the inner wall 17, so that the inner wall 17 is the outer wall. It is possible to hold the 16 relatively easily. Therefore, the inner wall 17 can be held with respect to the outer wall 16 with a relatively simple operation. Therefore, in particular, in this embodiment, the third holding structure 33 can be used as a temporary fixing means before applying the first holding structure 31 (welding portion 36).

この実施形態の構成によれば、第１保持構造３１（溶着部３６）において、上内壁１７Ａ（第１内壁体）の上内壁フランジ２０ａ（縁部）と下内壁１７Ｂ（第２内壁体）の下内壁フランジ２０ｂ（縁部）が、上外壁１６Ａ（第１外壁体）の上外壁フランジ１９ａ（縁部）と下外壁１６Ｂ（第２外壁体）の下外壁フランジ１９ｂ（縁部）との間に挟まれる。また、溶着部３６が、外壁合わせ面４１と、内壁合わせ面４２と、第１外壁内壁合わせ面４３と、第２外壁内壁合わせ面４４とを含む。従って、上外壁フランジ１９ａと下外壁フランジ１９ｂとの溶着と、上内壁フランジ２０ａと下内壁フランジ２０ｂとの溶着と、外壁１６と内壁１７との溶着とを同時に行うことが可能となる。このため、上外壁１６Ａと下外壁１６Ｂとの固定と、上内壁１７Ａと下内壁１７Ｂとの固定と、外壁１６対する内壁１７の保持とを同時に実施することができる。 According to the configuration of this embodiment, in the first holding structure 31 (welded portion 36), the upper inner wall flange 20a (edge portion) and the lower inner wall 17B (second inner wall body) of the upper inner wall 17A (first inner wall body) The lower inner wall flange 20b (edge) is between the upper outer wall flange 19a (edge) of the upper outer wall 16A (first outer wall) and the lower outer wall flange 19b (edge) of the lower outer wall 16B (second outer wall). It is sandwiched between. Further, the welding portion 36 includes an outer wall mating surface 41, an inner wall mating surface 42, a first outer wall inner wall mating surface 43, and a second outer wall inner wall mating surface 44. Therefore, it is possible to weld the upper outer wall flange 19a and the lower outer wall flange 19b, the upper inner wall flange 20a and the lower inner wall flange 20b, and the outer wall 16 and the inner wall 17 at the same time. Therefore, the upper outer wall 16A and the lower outer wall 16B can be fixed, the upper inner wall 17A and the lower inner wall 17B can be fixed, and the inner wall 17 can be held with respect to the outer wall 16 at the same time.

更に、この実施形態の構成によれば、溶着部３６の一部分には、上外壁フランジ１９ａと下内壁フランジ２０ｂとが接する第１外壁内壁接触面４５が設けられ、溶着部３６の他の一部分には、下外壁フランジ１９ｂと上内壁フランジ２０ａとが接する第２外壁内壁接触面４６とが設けられる。従って、内壁１７の外壁１６に対する保持強度が増す。このため、内壁１７の外壁１６に対する保持耐久性を向上させることができる。 Further, according to the configuration of this embodiment, a first outer wall inner wall contact surface 45 in which the upper outer wall flange 19a and the lower inner wall flange 20b are in contact with each other is provided in a part of the welded portion 36, and the other part of the welded portion 36 is provided. Is provided with a second outer wall inner wall contact surface 46 in which the lower outer wall flange 19b and the upper inner wall flange 20a are in contact with each other. Therefore, the holding strength of the inner wall 17 with respect to the outer wall 16 is increased. Therefore, the holding durability of the inner wall 17 with respect to the outer wall 16 can be improved.

＜第２実施形態＞
次に、第２実施形態について説明する。なお、以下の説明において、第１実施形態と同等の構成要素については同一の符号を付して説明を省略し、以下には異なった点を中心に説明する。 <Second Embodiment>
Next, the second embodiment will be described. In the following description, the components equivalent to those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and the differences will be mainly described below.

[ＥＧＲガス分配器の概要について]
図３３に、この実施形態のＥＧＲガス分配器５１を斜視図により示す。図３４に、ＥＧＲガス分配器５１を平面図により示す。図３５に、ＥＧＲガス分配器５１を正面図により示す。図３６に、ＥＧＲガス分配器５１を、図３４のＪ−Ｊ線断面図により示す。図３３〜図３６に示すＥＧＲガス分配器５１の外観や構造は、本開示技術の一例を示すものである。 [Overview of EGR gas distributor]
FIG. 33 shows the EGR gas distributor 51 of this embodiment in a perspective view. FIG. 34 shows the EGR gas distributor 51 in a plan view. FIG. 35 shows the EGR gas distributor 51 in a front view. FIG. 36 shows the EGR gas distributor 51 with a cross-sectional view taken along the line JJ of FIG. 34. The appearance and structure of the EGR gas distributor 51 shown in FIGS. 33 to 36 show an example of the disclosed technology.

この実施形態のＥＧＲガス分配器５１は、ガスチャンバ１３を構成する部分に温水通路５４が設けられる点で、第１実施形態のＥＧＲガス分配器１と構成が異なる。図３３〜図３６に示すように、ガスチャンバ１３の上側には、上方へ突出すると共に長手方向へ伸びる突条５３が設けられる。この突条５３の部分に温水通路５４が設けられる。この実施形態では、図３６に示すように、突条５３は、上外壁１６Ａと上内壁１７Ａにより構成される。温水通路５４は、上内壁１７Ａの長手方向Ｘに沿って形成される。上外壁１６Ａの長手方向Ｘの一端部には、温水通路５４に通じる温水導入継手５６が設けられ、上外壁１６Ａの長手方向Ｘの他端部には、温水通路５４に通じる温水導出継手５７が設けられる。これら温水導入継手５６及び温水導出継手５７には、冷却水配管が接続される。そして、温水導入継手５６から温水通路５４へ温水（エンジン冷却水）が導入され、温水通路５４を流れた温水が温水導出継手５７から導出される。この実施形態で、ガスチャンバ１３に設けられる温水通路５４は、この開示技術における加熱部に相当する。 The EGR gas distributor 51 of this embodiment is different from the EGR gas distributor 1 of the first embodiment in that a hot water passage 54 is provided in a portion constituting the gas chamber 13. As shown in FIGS. 33 to 36, a ridge 53 is provided on the upper side of the gas chamber 13 so as to project upward and extend in the longitudinal direction. A hot water passage 54 is provided in the portion of the ridge 53. In this embodiment, as shown in FIG. 36, the ridge 53 is composed of an upper outer wall 16A and an upper inner wall 17A. The hot water passage 54 is formed along the longitudinal direction X of the upper inner wall 17A. A hot water introduction joint 56 leading to the hot water passage 54 is provided at one end of the upper outer wall 16A in the longitudinal direction X, and a hot water outlet joint 57 leading to the hot water passage 54 is provided at the other end of the upper outer wall 16A in the longitudinal direction X. Provided. A cooling water pipe is connected to the hot water introduction joint 56 and the hot water outlet joint 57. Then, hot water (engine cooling water) is introduced from the hot water introduction joint 56 into the hot water passage 54, and the hot water flowing through the hot water passage 54 is led out from the hot water outlet joint 57. In this embodiment, the hot water passage 54 provided in the gas chamber 13 corresponds to the heating section in this disclosed technique.

［ＥＧＲガス分配器の作用及び効果］
以上説明したこの実施形態のＥＧＲガス分配器５１の構成によれば、第１実施形態のＥＧＲガス分配器１と同等の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、ガスチャンバ１３を構成する上内壁１７Ａに温水通路５４が設けられる。そして、この温水通路５４に温水が流れることにより、その温水の熱が内壁１７の内面へ伝わる。すなわち、ガスチャンバ１３に対応する内壁１７に、その内壁１７を加熱する温水通路５４（加熱部）が設けられるので、温水通路５４の熱により内壁１７が速やかに暖められる。このため、ガスチャンバ１３の内部を効率良く昇温させることができ、ガスチャンバ１３における凝縮水の発生を比較的早期に抑えることができる。例えば、エンジンの冷間始動時の比較的早い時期から、温水通路５４に温水を流すことで、ガスチャンバ１３の内部を効率良く昇温させることができる。特に、この実施形態では、内壁１７が薄肉に形成されるので、温水による内壁１７の昇温をより早めることができる。この結果、エンジンの冷間始動時の比較的早い時期から、ガスチャンバ１３における凝縮水の発生を抑えることができ、冷間始動時の比較的早い時期からＥＧＲを開始することができる。 [Action and effect of EGR gas distributor]
According to the configuration of the EGR gas distributor 51 of this embodiment described above, in addition to the same actions and effects as the EGR gas distributor 1 of the first embodiment, the following actions and effects can be obtained. That is, in this embodiment, the hot water passage 54 is provided in the upper inner wall 17A constituting the gas chamber 13. Then, when the hot water flows through the hot water passage 54, the heat of the hot water is transmitted to the inner surface of the inner wall 17. That is, since the inner wall 17 corresponding to the gas chamber 13 is provided with the hot water passage 54 (heating portion) for heating the inner wall 17, the inner wall 17 is quickly warmed by the heat of the hot water passage 54. Therefore, the temperature inside the gas chamber 13 can be efficiently raised, and the generation of condensed water in the gas chamber 13 can be suppressed at a relatively early stage. For example, the temperature inside the gas chamber 13 can be efficiently raised by flowing hot water through the hot water passage 54 from a relatively early time when the engine is cold started. In particular, in this embodiment, since the inner wall 17 is formed to be thin, the temperature rise of the inner wall 17 by warm water can be accelerated. As a result, the generation of condensed water in the gas chamber 13 can be suppressed from a relatively early time when the engine is cold started, and the EGR can be started from a relatively early time when the engine is cold started.

なお、この開示技術は前記各実施形態に限定されるものではなく、開示技術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。 It should be noted that this disclosure technique is not limited to each of the above-described embodiments, and a part of the configuration may be appropriately modified and implemented within a range that does not deviate from the purpose of the disclosure technique.

（１）前記各実施形態では、外壁１６（上外壁１６Ａ、下外壁１６Ｂ）と内壁１７（上内壁１７Ａ、下内壁１７Ｂ）を共に樹脂材により構成した。これに対し、図３７に示すように、外壁１６（上外壁１６Ａ、下外壁１６Ｂ）を樹脂材により構成し、内壁１７（上内壁１７Ａ、下内壁１７Ｂ）を金属材により構成することもできる。この場合、内壁１７が金属材により構成されるので、ガス入口１１から導入されるＥＧＲガスの熱により内壁１７が速やかに暖められる。このため、内壁１７の昇温効果を向上させることができ、もってＥＧＲガス分配器１の内部での凝縮水の発生をより一層抑制することができる。図３７は、ＥＧＲガス分配器を示す図５に準ずる断面図である。 (1) In each of the above embodiments, the outer wall 16 (upper outer wall 16A, lower outer wall 16B) and the inner wall 17 (upper inner wall 17A, lower inner wall 17B) are both made of a resin material. On the other hand, as shown in FIG. 37, the outer wall 16 (upper outer wall 16A, lower outer wall 16B) may be made of a resin material, and the inner wall 17 (upper inner wall 17A, lower inner wall 17B) may be made of a metal material. In this case, since the inner wall 17 is made of a metal material, the inner wall 17 is quickly warmed by the heat of the EGR gas introduced from the gas inlet 11. Therefore, the effect of raising the temperature of the inner wall 17 can be improved, and thus the generation of condensed water inside the EGR gas distributor 1 can be further suppressed. FIG. 37 is a cross-sectional view showing an EGR gas distributor according to FIG.

（２）前記各実施形態では、図３０〜図３２に示すように、第１保持構造３１（溶着部３６）において、上外壁フランジ１９ａと下外壁フランジ１９ｂの合わせ面の重なりと、上内壁フランジ２０ａと下内壁フランジ２０ｂの合わせ面の重なりとを相互にずらすことにより、第１外壁内壁接触面４５及び第２外壁内壁接触面４６（太い破線で示す部分）を構成した。これに対し、図３８に示すように、第１保持構造３１（溶着部３６）において、上記した第１外壁内壁接触面４５及び第２外壁内壁接触面４６を省略することもできる。図３８は、ガスチャンバの部分を模式的に示す図３０に準ずる断面図である。 (2) In each of the above-described embodiments, as shown in FIGS. 30 to 32, in the first holding structure 31 (welded portion 36), the overlapping surfaces of the upper outer wall flange 19a and the lower outer wall flange 19b and the upper inner wall flange By shifting the overlap of the mating surfaces of the lower inner wall flange 20b and 20a from each other, the first outer wall inner wall contact surface 45 and the second outer wall inner wall contact surface 46 (the portion indicated by the thick broken line) were formed. On the other hand, as shown in FIG. 38, in the first holding structure 31 (welded portion 36), the above-mentioned first outer wall inner wall contact surface 45 and second outer wall inner wall contact surface 46 can be omitted. FIG. 38 is a cross-sectional view according to FIG. 30, which schematically shows a portion of the gas chamber.

（３）前記各実施形態では、内壁１７（上内壁１７Ａ、下内壁１７Ｂ）の全体（上内壁フランジ２０ａ、下内壁フランジ２０ｂを含む）を樹脂材により構成し、第１保持構造３１（溶着部３６）にて樹脂材の上内壁フランジ２０ａと下内壁フランジ２０ｂを溶着するように構成した。これに対し、内壁１７（上内壁１７Ａ、下内壁１７Ｂ）の大部分（上内壁フランジ２０ａ、下内壁フランジ２０ｂの部分を除く）を金属材により構成し、上内壁フランジ２０ａと下内壁フランジ２０ｂを含む部分を樹脂材により構成し、第１保持構造３１（溶着部３６）にて樹脂材の上内壁フランジ２０ａと下内壁フランジ２０ｂを溶着するように構成することもできる。 (3) In each of the above embodiments, the entire inner wall 17 (upper inner wall 17A, lower inner wall 17B) (including the upper inner wall flange 20a and the lower inner wall flange 20b) is made of a resin material, and the first holding structure 31 (welded portion). In 36), the upper inner wall flange 20a and the lower inner wall flange 20b of the resin material were welded together. On the other hand, most of the inner wall 17 (upper inner wall 17A, lower inner wall 17B) (excluding the upper inner wall flange 20a and the lower inner wall flange 20b) is made of a metal material, and the upper inner wall flange 20a and the lower inner wall flange 20b are formed. The portion including the resin material may be formed of a resin material, and the upper inner wall flange 20a and the lower inner wall flange 20b of the resin material may be welded by the first holding structure 31 (welding portion 36).

（４）前記各実施形態では、外壁１６を上外壁１６Ａと下外壁１６Ｂとの二つの部材に分割して構成し、内壁１７を上内壁１７Ａと下内壁１７Ｂとの二つの部材に分割して構成した。これに対し、外壁と内壁の少なくとも一方を一つの部材から構成することもできる。 (4) In each of the above embodiments, the outer wall 16 is divided into two members, an upper outer wall 16A and a lower outer wall 16B, and the inner wall 17 is divided into two members, an upper inner wall 17A and a lower inner wall 17B. Configured. On the other hand, at least one of the outer wall and the inner wall can be composed of one member.

（５）前記各実施形態では、断熱層１５を空気層により構成したが、断熱層を発泡材により構成することもできる。 (5) In each of the above embodiments, the heat insulating layer 15 is made of an air layer, but the heat insulating layer can also be made of a foaming material.

（６）前記各実施形態では、ガス分配通路１４Ａ〜１４Ｄに断熱層を設けなかったが、ガス分配通路にも断熱層を設けることができる。 (6) In each of the above-described embodiments, the heat insulating layer is not provided in the gas distribution passages 14A to 14D, but a heat insulating layer can also be provided in the gas distribution passage.

（７）前記第２実施形態では、上内壁１７Ａと下内壁１７Ｂとに分割して構成した内壁１７のうち、上内壁１７Ａに温水通路５４を設けて内壁１７を加熱するように構成したが、下内壁に温水通路を設けて内壁を加熱するように構成することもできる。 (7) In the second embodiment, of the inner wall 17 divided into the upper inner wall 17A and the lower inner wall 17B, the upper inner wall 17A is provided with a hot water passage 54 to heat the inner wall 17. A hot water passage may be provided on the lower inner wall to heat the inner wall.

（８）前記第２実施形態では、上内壁１７Ａと下内壁１７Ｂとに分割して構成した内壁１７に温水通路５４を設けたが、分割しない一体型の内壁に温水通路を設けることもできる。 (8) In the second embodiment, the hot water passage 54 is provided in the inner wall 17 which is divided into the upper inner wall 17A and the lower inner wall 17B, but a hot water passage may be provided in the integrated inner wall which is not divided.

（９）前記第２実施形態では、内壁１７に温水通路５４を設けて内壁１７を加熱するように構成したが、外壁に温水通路を設けて内壁を加熱するように構成したり、外壁と内壁の両方にわたって温水通路を設けて内壁を加熱するように構成したりすることもできる。 (9) In the second embodiment, the inner wall 17 is provided with a hot water passage 54 to heat the inner wall 17, but the outer wall may be provided with a hot water passage to heat the inner wall, or the outer wall and the inner wall may be heated. It is also possible to provide a hot water passage over both of the above to heat the inner wall.

（１０）前記第２実施形態では、温水通路５４により加熱部を構成したが、電気ヒータにより加熱部を構成することもできる。 (10) In the second embodiment, the heating unit is configured by the hot water passage 54, but the heating unit can also be configured by the electric heater.

この開示技術は、ガソリンエンジンやディーゼルエンジンに設けられるＥＧＲ装置に利用することができる。 This disclosed technology can be used for EGR devices provided in gasoline engines and diesel engines.

１ＥＧＲガス分配器
２吸気マニホールド
４分岐管
１１ガス入口
１３ガスチャンバ
１４Ａ〜１４Ｄガス分配通路
１５断熱層
１６外壁
１６Ａ上外壁（第１外壁体）
１６Ｂ下外壁（第２外壁体）
１７内壁
１７Ａ上内壁（第１内壁体）
１７Ｂ下内壁（第２内壁体）
１８中間層
１９ａ上外壁フランジ(縁部)
１９ｂ下外壁フランジ（縁部）
２０ａ上内壁フランジ（縁部）
２０ｂ下内壁フランジ（縁部）
２３スナップフィット（係合部）
２３ａ係合爪（凸部）
２３ｂ係合孔（凹部）
２４連通孔
２６かしめ部
２６ａ突起
２６ｂ貫通孔
２７連通孔
３１第１保持構造
３２第２保持構造
３３第３保持構造
３６溶着部
４１外壁合わせ面
４２内壁合わせ面
４３第１外壁内壁合わせ面
４４第２外壁内壁合わせ面
４５第１外壁内壁接触面
４６第２外壁内壁接触面
５１ＥＧＲガス分配器
５４温水通路（加熱部） 1 EGR gas distributor 2 Intake manifold 4 Branch pipe 11 Gas inlet 13 Gas chambers 14A to 14D Gas distribution passage 15 Insulation layer 16 Outer wall 16A Upper outer wall (first outer wall body)
16B lower outer wall (second outer wall body)
17 Inner wall 17A Upper inner wall (first inner wall body)
17B lower inner wall (second inner wall body)
18 Intermediate layer 19a Upper outer wall flange (edge)
19b Lower outer wall flange (edge)
20a Upper inner wall flange (edge)
20b Lower inner wall flange (edge)
23 Snap fit (engagement part)
23a Engagement claw (convex part)
23b Engagement hole (recess)
24 Communication hole 26 Caulking part 26a Protrusion 26b Through hole 27 Communication hole 31 First holding structure 32 Second holding structure 33 Third holding structure 36 Welding part 41 Outer wall mating surface 42 Inner wall mating surface 43 First outer wall Inner wall mating surface 44 Second Outer wall inner wall mating surface 45 First outer wall inner wall contact surface 46 Second outer wall inner wall contact surface 51 EGR gas distributor 54 Hot water passage (heating part)

Claims

An EGR gas distributor for distributing EGR gas to each of a plurality of branch pipes constituting an intake manifold.
The gas inlet into which the EGR gas is introduced and
A gas chamber that collects the EGR gas introduced from the gas inlet, and
In an EGR gas distributor provided with a plurality of gas distribution passages branched from the gas chamber and communicated with each of the branch pipes.
An EGR gas distributor characterized in that a heat insulating layer is provided at least a part of the gas chamber and the gas distribution passage.

In the EGR gas distributor according to claim 1,
At least a part of the gas chamber and the gas distribution passage has a double wall structure composed of an outer wall and an inner wall.
The EGR gas distributor, wherein the heat insulating layer includes an intermediate layer between the outer wall and the inner wall.

In the EGR gas distributor according to claim 2,
The EGR gas distributor, wherein the inner wall includes a communication hole communicating with the intermediate layer.

In the EGR gas distributor according to claim 2 or 3,
An EGR gas distributor characterized in that the outer wall is made of a resin material and the inner wall is made of a metal material.

In the EGR gas distributor according to claim 2 or 3,
An EGR gas distributor characterized in that the outer wall and the inner wall are made of a resin material.

In the EGR gas distributor according to claim 4 or 5,
A holding structure for holding the inner wall to the outer wall is provided between the outer wall and the inner wall.
The EGR gas distributor is characterized in that the holding structure is composed of a welded portion by welding a resin material.

In the EGR gas distributor according to claim 4 or 5,
A holding structure for holding the inner wall to the outer wall is provided between the outer wall and the inner wall.
The EGR gas distributor is characterized in that the holding structure is composed of an engaging portion that engages a convex portion provided on one of the outer wall and the inner wall with a concave portion provided on the other.

In the EGR gas distributor according to claim 4 or 5,
A holding structure for holding the inner wall to the outer wall is provided between the outer wall and the inner wall.
The holding structure is an EGR gas distributor characterized in that a part of the outer wall is crimped to the inner wall.

In the EGR gas distributor according to claim 6,
The outer wall is divided into a first outer wall body and a second outer wall body, and the inner wall is divided into a first inner wall body and a second inner wall body.
The welded portion is formed by aligning the outer wall mating surface between the edge portion of the first outer wall body and the edge portion of the second outer wall body, and the inner wall mating of the edge portion of the first inner wall body and the edge portion of the second inner wall body. The first outer wall inner wall mating surface of the surface, the edge portion of the first outer wall body and the edge portion of the first inner wall body, and the edge portion of the second outer wall body and the edge portion of the second inner wall body. 2 Including the outer wall and inner wall mating surface
In the welded portion, the edge portion of the first inner wall body and the edge portion of the second inner wall body are sandwiched between the edge portion of the first outer wall body and the edge portion of the second outer wall body. EGR gas distributor.

In the EGR gas distributor according to claim 9,
A part of the welded portion is provided with a first outer wall inner wall contact surface in which the edge portion of the first outer wall body and the edge portion of the second inner wall body are in contact, and the other part of the welded portion is provided with the second portion. An EGR gas distributor characterized in that a second outer wall inner wall contact surface is provided in which an edge portion of the outer wall body and an edge portion of the first inner wall body are in contact with each other.

In the EGR gas distributor according to any one of claims 2 to 10.
An EGR gas distributor characterized in that at least one of the outer wall and the inner wall is provided with a heating portion for heating at least one of the outer wall and the inner wall.