JP6676666B2 - Piping joint structure - Google Patents

Piping joint structure Download PDF

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Publication number
JP6676666B2
JP6676666B2 JP2018000612A JP2018000612A JP6676666B2 JP 6676666 B2 JP6676666 B2 JP 6676666B2 JP 2018000612 A JP2018000612 A JP 2018000612A JP 2018000612 A JP2018000612 A JP 2018000612A JP 6676666 B2 JP6676666 B2 JP 6676666B2
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Japan
Prior art keywords
flange
pipe
joint structure
collar
opening
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JP2018000612A
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JP2019120192A (en
Inventor
嘉信 石川
嘉信 石川
伊藤　聡
聡 伊藤
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Futaba Industrial Co Ltd
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Futaba Industrial Co Ltd
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Priority to JP2018000612A priority Critical patent/JP6676666B2/en
Priority to DE102018130782.9A priority patent/DE102018130782A1/en
Priority to CN201811492904.5A priority patent/CN110005513B/en
Publication of JP2019120192A publication Critical patent/JP2019120192A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1827—Sealings specially adapted for exhaust systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • F16L23/026—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • F16L23/028—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes the flanges being held against a shoulder
    • F16L23/0286—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes the flanges being held against a shoulder the shoulder not being formed from the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/16—Flanged joints characterised by the sealing means
    • F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Exhaust Silencers (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)

Description

本開示は、配管の継手構造に関する。   The present disclosure relates to a pipe joint structure.

車両の内燃機関から排出される排気ガス流路を構成する配管は、例えばステンレス鋼等の耐食性の高い金属で構成される。また、この配管は、フランジを備える継手構造によって他の配管と接続される（特許文献１参照）。   A pipe constituting an exhaust gas passage discharged from the internal combustion engine of the vehicle is made of a highly corrosion-resistant metal such as stainless steel. This pipe is connected to another pipe by a joint structure having a flange (see Patent Document 1).

特開２００９−２５０３３８号公報JP 2009-250338 A

継手構造において、特許文献１のようにフランジを鉄又は鋼で構成すると、配管の接続部分における隙間から漏れた排気ガスによって、フランジが腐食するおそれがある。しかしながら、配管の接続部分における隙間を無くすように加工を行うと、生産性が著しく低下する。   In the joint structure, if the flange is made of iron or steel as in Patent Literature 1, the flange may be corroded by exhaust gas leaking from a gap in a pipe connection portion. However, if the processing is performed so as to eliminate the gap in the connection portion of the pipe, the productivity is significantly reduced.

一方で、フランジをステンレス鋼で構成すれば腐食を抑制することができるが、フランジには一定の厚みが求められるため、フランジにステンレス鋼を用いると継手構造の材料費が著しく増加せざるを得ない。   On the other hand, corrosion can be suppressed if the flange is made of stainless steel, but a certain thickness is required for the flange. Therefore, if stainless steel is used for the flange, the material cost of the joint structure must be significantly increased. Absent.

本開示の一局面は、排気ガスによるフランジの腐食を抑制しつつ、継手構造のコストを低減できる配管の継手構造を提供することを目的としている。   An object of one aspect of the present disclosure is to provide a pipe joint structure that can reduce the cost of the joint structure while suppressing corrosion of the flange due to exhaust gas.

本開示の一態様は、内燃機関から排出される排気ガスの流路を構成する配管を取り付けるための継手構造である。継手構造は、フランジと、カラーと、を備える。フランジは、相手側フランジとガスケットを挟んで締結可能に構成されると共に、開口と中央領域とを有する。開口は、配管が挿通可能である。中央領域は、開口から径方向外側に延びると共に、フランジの厚み方向へ凹む。カラーは、フランジを構成する金属よりも耐腐食性が高い金属で構成されると共に、筒状部とリング部とを有する。筒状部は、配管の外周面の全周を覆う形状を有すると共に、一端側において配管の外周面の全周に接合可能に構成される。リング部は、筒状部の他端から連続し、少なくともガスケットの開口部よりも径方向外側へ延びるように構成されると共に、中央領域においてフランジと接合される。   One embodiment of the present disclosure is a joint structure for attaching a pipe constituting a flow path of exhaust gas discharged from an internal combustion engine. The joint structure includes a flange and a collar. The flange is configured to be able to be fastened to the mating flange with the gasket therebetween, and has an opening and a central region. The opening can be inserted with a pipe. The central region extends radially outward from the opening and is recessed in the thickness direction of the flange. The collar is made of a metal having higher corrosion resistance than the metal forming the flange, and has a cylindrical portion and a ring portion. The tubular portion has a shape that covers the entire outer peripheral surface of the pipe, and is configured to be able to be joined to the entire outer peripheral surface of the pipe at one end. The ring portion is configured to be continuous from the other end of the tubular portion, to extend at least radially outward from the opening of the gasket, and to be joined to the flange in the central region.

このような構成によれば、フランジを低コストの金属材料で形成しつつ、フランジの排気ガスが接触し得る部分を耐腐食性の高いカラーで覆うことで腐食を抑制できる。カラーは、フランジと異なり、厚みを小さくしやすい。そのため、フランジの腐食を抑制しつつ、継手構造のコストを低減できる。   According to such a configuration, corrosion can be suppressed by forming the flange with a low-cost metal material and covering a portion of the flange with which exhaust gas can come into contact with a collar having high corrosion resistance. The collar, unlike the flange, can be easily reduced in thickness. Therefore, the cost of the joint structure can be reduced while suppressing corrosion of the flange.

また、カラーがフランジに接合されることで、継手構造の相手部材への取り付け時においてフランジが遊動することが抑制できる。その結果、フランジの締結における作業性が向上する。また、フランジによって発生する面圧をカラーに均等に伝達できるので、シール性が向上する。   In addition, since the collar is joined to the flange, the flange can be prevented from floating when the joint structure is attached to the mating member. As a result, workability in fastening the flange is improved. Further, since the surface pressure generated by the flange can be evenly transmitted to the collar, the sealing performance is improved.

本開示の一態様では、配管は、排気再循環流路を構成してもよい。このような構成によれば、湿度や温度の高い排気ガスが断続的に流れることに起因して温度変化が激しく、結露により腐食が発生しやすい排気再循環流路（ＥＧＲ）において、フランジの腐食を効果的に抑制しつつ、継手構造のコストを低減できる。   In one aspect of the present disclosure, the pipe may constitute an exhaust gas recirculation flow path. According to such a configuration, the temperature changes drastically due to intermittent flow of the exhaust gas having high humidity and temperature, and the corrosion of the flange in the exhaust gas recirculation flow path (EGR) where corrosion is likely to occur due to dew condensation. Can be effectively suppressed and the cost of the joint structure can be reduced.

本開示の一態様では、カラーは、リング部から配管の径方向外側に突出する少なくとも１つの耳部をさらに有してもよい。少なくとも１つの耳部には、それぞれ貫通孔が設けられてもよい。このような構成によれば、カラーのフランジに対する位置決めを容易に行うことができるため、作業工数を低減できると共に、位置精度を高めることができる。   In one aspect of the present disclosure, the collar may further include at least one ear protruding radially outward of the pipe from the ring. Each of the at least one ear may have a through hole. According to such a configuration, since the positioning of the collar with respect to the flange can be easily performed, the number of operation steps can be reduced and the positional accuracy can be increased.

図１は、実施形態における配管の継手構造を用いた排気マニホールドの模式的な説明図である。FIG. 1 is a schematic explanatory view of an exhaust manifold using a pipe joint structure according to the embodiment. 図２Ａは、実施形態における配管の継手構造の模式的な正面図であり、図２Ｂは、図２Ａの配管の継手構造の模式的な背面図である。FIG. 2A is a schematic front view of a pipe joint structure according to the embodiment, and FIG. 2B is a schematic rear view of the pipe joint structure of FIG. 2A. 図３は、図２ＢのＩＩＩ−ＩＩＩ線での模式的な断面図である。FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 2B. 図４は、図３とは異なる実施形態における配管の継手構造の模式的な断面図である。FIG. 4 is a schematic cross-sectional view of a pipe joint structure in an embodiment different from FIG.

以下、本開示が適用された実施形態について、図面を用いて説明する。
［１．第１実施形態］
［１−１．構成］
図１及び図２Ａ，２Ｂに示す配管の継手構造（以下、単に「継手構造」ともいう。）１は、内燃機関から排出される排気ガスの流路を構成する配管同士の接続に用いられる。図１に示すように、継手構造１は、排気マニホールド１０に設けられている。また、図２Ａ，２Ｂに示すように、継手構造１は、配管２と、フランジ３と、カラー４と、を備える。 Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
A pipe joint structure (hereinafter, also simply referred to as a “joint structure”) 1 shown in FIG. 1 and FIGS. 2A and 2B is used for connecting pipes forming a flow path of exhaust gas discharged from an internal combustion engine. As shown in FIG. 1, the joint structure 1 is provided on an exhaust manifold 10. As shown in FIGS. 2A and 2B, the joint structure 1 includes a pipe 2, a flange 3, and a collar 4.

＜配管＞
配管２は、内燃機関から排出される排気ガスの流路を構成している。配管２は、高温の排気ガスによる腐食に対する耐性を有する金属、例えばステンレス鋼で形成されている。 <Piping>
The pipe 2 forms a flow path of exhaust gas discharged from the internal combustion engine. The pipe 2 is formed of a metal having resistance to corrosion by high-temperature exhaust gas, for example, stainless steel.

本実施形態では、配管２は、自動車の内燃機関から排出される排気ガスの一部を内燃機関に吸気させるＥＧＲを構成している。つまり、継手構造１は、内燃機関の吸気経路を構成する配管の継手に接続される。   In the present embodiment, the pipe 2 forms an EGR that causes a part of the exhaust gas discharged from the internal combustion engine of the automobile to be taken into the internal combustion engine. That is, the joint structure 1 is connected to a joint of a pipe constituting an intake path of the internal combustion engine.

＜フランジ＞
フランジ３は、配管２の端部に配置され、配管２の径方向外側に突出する部材である。フランジ３は、相手側フランジとガスケットを挟んで締結可能に構成されている。 <Flange>
The flange 3 is a member arranged at an end of the pipe 2 and protruding radially outward of the pipe 2. The flange 3 is configured to be fastened with a mating flange and a gasket therebetween.

フランジ３には、配管２の端部が挿通される開口３Ａが形成されている。本実施形態では開口３Ａの径は、配管２の外径よりも大きく、開口３Ａと配管２との間に、後述するカラー４の筒状部４Ｂが存在している。   An opening 3 </ b> A through which the end of the pipe 2 is inserted is formed in the flange 3. In this embodiment, the diameter of the opening 3A is larger than the outer diameter of the pipe 2, and a cylindrical portion 4B of the collar 4 described below exists between the opening 3A and the pipe 2.

フランジ３は、図３に示すように、継手構造１が接続される相手配管Ａ１に設けられた相手フランジＡ２と締結される。フランジ３は、カラー４を構成する金属よりも耐腐食性及びコストの低い、鉄や鋼等の金属で構成されている。   As shown in FIG. 3, the flange 3 is fastened to a mating flange A2 provided in a mating pipe A1 to which the joint structure 1 is connected. The flange 3 is made of a metal such as iron or steel, which has lower corrosion resistance and lower cost than the metal forming the collar 4.

図３に示すように、フランジ３は、締結面（つまり、相手フランジＡ２との突合せ面）において、開口３Ａの周囲の中央領域３Ｂが、中央領域３Ｂよりも配管２の径方向外側の端部領域３Ｃよりも配管２に向かって（つまり締結面と反対側の面に向かってフランジの厚み方向へ）凹んでいる。つまり、中央領域３Ｂにおけるフランジ３の厚みは、端部領域３Ｃにおけるフランジ３の厚みよりも小さい。   As shown in FIG. 3, the flange 3 has a fastening surface (that is, an abutting surface with the mating flange A2) in which a central region 3B around the opening 3A has a radially outer end portion of the pipe 2 than the central region 3B. It is recessed toward the pipe 2 from the region 3C (that is, in the thickness direction of the flange toward the surface opposite to the fastening surface). That is, the thickness of the flange 3 in the central region 3B is smaller than the thickness of the flange 3 in the end region 3C.

本実施形態では、図２Ｂに示すように、端部領域３Ｃは、中央領域３Ｂ及び配管２の中心軸を挟むように配置されている。なお、フランジ３の端部領域３Ｃには、締結用の複数の貫通孔３Ｄが形成されている。   In this embodiment, as shown in FIG. 2B, the end region 3C is arranged so as to sandwich the central axis of the central region 3B and the pipe 2. A plurality of fastening holes 3D are formed in the end region 3C of the flange 3.

また、本実施形態では、フランジ３は、後述するカラー４を介して配管２に固定されている一方で、配管２とは直接接合されていない。ただし、フランジ３は、配管２に溶接等によって直接接合されていてもよい。   In the present embodiment, the flange 3 is fixed to the pipe 2 via a collar 4 described later, but is not directly joined to the pipe 2. However, the flange 3 may be directly joined to the pipe 2 by welding or the like.

＜カラー＞
カラー４は、配管２とフランジ３との双方に接合された部材である。カラー４は、フランジ３を構成する金属よりも耐腐食性が高い金属で構成される。カラー４を構成する金属としては、例えばステンレス鋼が挙げられる。 <Color>
The collar 4 is a member joined to both the pipe 2 and the flange 3. The collar 4 is made of a metal having higher corrosion resistance than the metal forming the flange 3. The metal constituting the collar 4 is, for example, stainless steel.

カラー４は、図２Ａ，２Ｂ及び図３に示すように、リング部４Ａと、筒状部４Ｂと、２つの耳部４Ｃとを有する。リング部４Ａ、筒状部４Ｂ及び耳部４Ｃは、一枚の金属板の加工によって形成されている。   As shown in FIGS. 2A, 2B and 3, the collar 4 has a ring portion 4A, a tubular portion 4B, and two ear portions 4C. The ring portion 4A, the cylindrical portion 4B, and the ear portion 4C are formed by processing a single metal plate.

（リング部）
リング部４Ａは、筒状部４Ｂの配管２との接合端とは反対側の端から連続し、少なくともガスケット６の開口部よりも径方向外側へ延びるように構成されている。具体的には、リング部４Ａは、フランジ３の締結面のうち、中央領域３Ｂに重ね合わされている。リング部４Ａは、図２Ｂに示すように、フランジ３の厚み方向から視て、フランジ３の開口３Ａを取り囲むように配置されている。 (Ring part)
The ring portion 4 </ b> A is configured to be continuous from the end of the cylindrical portion 4 </ b> B on the side opposite to the joint end with the pipe 2 and to extend at least radially outward from the opening of the gasket 6. Specifically, the ring portion 4A is overlapped with the central region 3B of the fastening surface of the flange 3. The ring portion 4A is arranged so as to surround the opening 3A of the flange 3 when viewed from the thickness direction of the flange 3, as shown in FIG. 2B.

リング部４Ａは、フランジ３の中央領域３Ｂに、プロジェクション溶接されている。本実施形態では、リング部４Ａは、４つの溶接部５においてプロジェクション溶接されている。   The ring portion 4A is projection-welded to the central region 3B of the flange 3. In the present embodiment, the ring portion 4A is projection-welded at the four welding portions 5.

４つの溶接部５は、継手構造１を締結する際にカラー４と相手フランジＡ２との間に配置されるガスケット６と重ならない位置に設けられている。また、４つの溶接部５のうち、２つの溶接部５と、残り２つの溶接部５とが互いに近接して配置されている。近接して配置された２つの溶接部５からなる組は、配管２の中心について対称な位置に配置されている。   The four welds 5 are provided at positions that do not overlap with the gasket 6 disposed between the collar 4 and the mating flange A2 when the joint structure 1 is fastened. Two of the four welds 5 and the remaining two welds 5 are arranged close to each other. A set of two welds 5 arranged close to each other is arranged at a position symmetrical about the center of the pipe 2.

本実施形態では、４つの溶接部５は、後述する耳部４Ｃとリング部４Ａとの接続部分の近傍に設けられている。つまり、リング部４Ａは、耳部４Ｃの近傍でフランジ３に溶接されている。   In the present embodiment, the four welds 5 are provided in the vicinity of a connection portion between a lug 4C and a ring 4A described later. That is, the ring portion 4A is welded to the flange 3 near the ear portion 4C.

なお、溶接部５の数は４に限定されず、少なくとも１つの溶接部５が存在すればよい。ただし、強度の観点から、配管２の中心を挟んで配置された少なくとも２つの溶接部５が設けられることが好ましい。   The number of the welds 5 is not limited to four, and at least one weld 5 may be present. However, from the viewpoint of strength, it is preferable to provide at least two welds 5 arranged with the center of the pipe 2 interposed therebetween.

（筒状部）
筒状部４Ｂは、配管２の外周面の全周を覆う形状を有すると共に、一端側において配管２の外周面の全周に接合可能に構成されている。具体的には、筒状部４Ｂは、図３に示すように、配管２の端部に外側から軸方向に挿入され、その内周面が配管２の外周面に例えば溶接により接合されている。 (Cylindrical part)
The tubular portion 4B has a shape that covers the entire circumference of the outer peripheral surface of the pipe 2 and is configured to be joined to the entire circumference of the outer peripheral surface of the pipe 2 at one end. Specifically, as shown in FIG. 3, the cylindrical portion 4 </ b> B is axially inserted into the end of the pipe 2 from the outside, and the inner peripheral surface is joined to the outer peripheral surface of the pipe 2 by, for example, welding. .

筒状部４Ｂは、リング部４Ａと連続しており、リング部４Ａの内縁から配管２の軸方向に延出している。リング部４Ａ及び筒状部４Ｂは、開口を設けた金属板をバーリング加工することによって形成されている。   The tubular portion 4B is continuous with the ring portion 4A, and extends in the axial direction of the pipe 2 from the inner edge of the ring portion 4A. The ring portion 4A and the cylindrical portion 4B are formed by burring a metal plate provided with an opening.

本実施形態では、筒状部４Ｂと配管２とは、配管２の周方向に沿ったアーク溶接によって結合されている。ただし、筒状部４Ｂと配管２との溶接方法は、アーク溶接に限定されない。   In the present embodiment, the tubular portion 4B and the pipe 2 are joined by arc welding along the circumferential direction of the pipe 2. However, the method of welding the tubular portion 4B and the pipe 2 is not limited to arc welding.

また、本実施形態では、筒状部４Ｂはフランジ３と離間して配置されている。つまり、フランジ３の開口３Ａを構成する側面と、筒状部４Ｂの外周面との間には空隙が設けられている。   Further, in the present embodiment, the cylindrical portion 4B is arranged apart from the flange 3. That is, a gap is provided between the side surface forming the opening 3A of the flange 3 and the outer peripheral surface of the cylindrical portion 4B.

（耳部）
２つの耳部４Ｃは、それぞれ、リング部４Ａから配管２の径方向外側に突出している。また、２つの耳部４Ｃにおいて、フランジ３よりも配管２の径方向外側に突出した領域には、それぞれ貫通孔４Ｄが設けられている。 (Ears)
The two ears 4C respectively protrude radially outward of the pipe 2 from the ring 4A. In the two ears 4C, through holes 4D are provided in regions protruding radially outward of the pipe 2 from the flange 3 respectively.

カラー４のフランジ３へのプロジェクション溶接時において、２つの貫通孔４Ｄにそれぞれピンを挿入することで、カラー４とフランジ３との位置決めを容易かつ確実に行うことができる。   At the time of projection welding of the collar 4 to the flange 3, by inserting a pin into each of the two through holes 4 </ b> D, the positioning of the collar 4 and the flange 3 can be performed easily and reliably.

［１−２．効果］
以上詳述した実施形態によれば、以下の効果が得られる。
（１ａ）フランジ３を低コストの金属材料で形成しつつ、フランジ３の排気ガスが接触し得る部分（つまり中央領域３Ｂ）を耐腐食性の高いカラー４で覆うことで腐食が抑制できる。カラー４は、フランジと異なり、厚みを小さくしやすい。そのため、フランジ３の腐食を抑制しつつ、継手構造１のコストを低減できる。 [1-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(1a) Corrosion can be suppressed by forming the flange 3 from a low-cost metal material and covering a portion of the flange 3 with which exhaust gas can come into contact (that is, the central region 3B) with the collar 4 having high corrosion resistance. Unlike the flange, the collar 4 is easily reduced in thickness. Therefore, the cost of the joint structure 1 can be reduced while suppressing corrosion of the flange 3.

（１ｂ）カラー４がフランジ３に溶接されることで、継手構造１の相手部材への取り付け時においてフランジ３が遊動することが抑制できる。その結果、フランジ３の締結における作業性が向上する。また、フランジ３によって発生する面圧をカラー４に均等に伝達できるので、シール性が向上する。   (1b) Since the collar 4 is welded to the flange 3, the flange 3 can be prevented from floating when the joint structure 1 is attached to the mating member. As a result, workability in fastening the flange 3 is improved. Further, since the surface pressure generated by the flange 3 can be evenly transmitted to the collar 4, the sealing performance is improved.

（１ｃ）カラー４は、そのリング部４Ａにおいて、入熱量がアーク溶接に比べて小さいプロジェクション溶接によってフランジ３に接合されるので、リング部４Ａの締結面の歪を低減して平面度を高めることができる。また、プロジェクション溶接の採用によってカラー４の厚みを小さくできるため、カラー４の厚みと配管２の肉厚とを近づけることができる。その結果、カラー４と配管２との溶接部分における亀裂の発生が抑制され、カラー４と配管２との溶接強度を高められる。   (1c) Since the collar 4 is joined to the flange 3 by projection welding having a smaller heat input than the arc welding at the ring portion 4A, the distortion of the fastening surface of the ring portion 4A is reduced to increase the flatness. Can be. Further, since the thickness of the collar 4 can be reduced by employing the projection welding, the thickness of the collar 4 can be made close to the thickness of the pipe 2. As a result, the occurrence of cracks in the welded portion between the collar 4 and the pipe 2 is suppressed, and the welding strength between the collar 4 and the pipe 2 can be increased.

（１ｄ）湿度や温度の高い排気ガスが断続的に流れることに起因して温度変化が激しく、結露により腐食が発生しやすいＥＧＲにおいて、フランジ３の腐食を効果的に抑制しつつ、継手構造１のコストを低減できる。   (1d) In an EGR in which temperature changes drastically due to intermittent flow of exhaust gas with high humidity or temperature and corrosion is likely to occur due to dew condensation, the joint structure 1 while effectively suppressing the corrosion of the flange 3 Cost can be reduced.

（１ｅ）貫通孔４Ｄがそれぞれ設けられた２つの耳部４Ｃによって、カラー４のフランジ３に対する位置決めを容易に行うことができる。その結果、作業工数を低減できると共に、位置精度を高めることができる。   (1e) The positioning of the collar 4 with respect to the flange 3 can be easily performed by the two ears 4C provided with the through holes 4D. As a result, the number of work steps can be reduced, and the position accuracy can be increased.

具体的には、カラー４とフランジ３との溶接時に、複数のピンが立てられた台座を用いる。台座のピンにカラー４の貫通孔４Ｄを挿通し、フランジ３の貫通孔３Ｄにフランジ固定用のピンを通して、溶接を行う。これにより、カラー４の回転が防止され、フランジ３に対するカラー４の位置が精度よく決められる。   Specifically, at the time of welding the collar 4 and the flange 3, a pedestal on which a plurality of pins are erected is used. The through holes 4D of the collar 4 are inserted through the pins of the pedestal, and the pins for fixing the flanges are passed through the through holes 3D of the flange 3, and welding is performed. Thereby, the rotation of the collar 4 is prevented, and the position of the collar 4 with respect to the flange 3 is determined accurately.

［２．他の実施形態］
以上、本開示の実施形態について説明したが、本開示は、上記実施形態に限定されることなく、種々の形態を採り得ることは言うまでもない。 [2. Other Embodiments]
As described above, the embodiments of the present disclosure have been described, but it is needless to say that the present disclosure is not limited to the above-described embodiments, and can take various forms.

（２ａ）上記実施形態の配管の継手構造１において、プロジェクション溶接の代わりに、スポット溶接を用いてカラー４をフランジ３に接合してもよい。また、溶接以外の手段でカラー４をフランジ３に接合してもよい。   (2a) In the pipe joint structure 1 of the above embodiment, the collar 4 may be joined to the flange 3 using spot welding instead of projection welding. Further, the collar 4 may be joined to the flange 3 by means other than welding.

（２ｂ）上記実施形態の配管の継手構造１は、ＥＧＲ以外の排気ガスの流路を構成する配管にも適用できる。つまり、継手構造１は、図１の排気マニホールドの任意の配管に適用できる。   (2b) The pipe joint structure 1 of the above embodiment can also be applied to a pipe constituting a flow path of exhaust gas other than EGR. That is, the joint structure 1 can be applied to any piping of the exhaust manifold of FIG.

（２ｃ）上記実施形態の配管の継手構造１において、カラー４は、１つ又は３つ以上の耳部４Ｃを有していてもよい。また、カラー４は、必ずしも耳部４Ｃを有していなくてもよい。   (2c) In the pipe joint structure 1 of the above embodiment, the collar 4 may have one or three or more ears 4C. Further, the collar 4 does not necessarily have to have the ears 4C.

（２ｄ）上記実施形態の配管の継手構造１において、図４に示すように、ガスケットは、厚み方向両側に突出する凸部６Ａを有してもよい。凸部６Ａは、ガスケットの径方向中央領域に円環状に設けられている。また、図４では、リング部４Ａは、凸部６Ａよりも径方向外側まで延伸している。フランジ締結時にリング部４Ａによって凸部６Ａが押しつぶされることで、シール性が向上する。   (2d) In the joint structure 1 of the pipe of the embodiment, as shown in FIG. 4, the gasket may have a protrusion 6A protruding on both sides in the thickness direction. The protrusion 6A is provided in an annular shape in a radially central region of the gasket. In FIG. 4, the ring portion 4A extends radially outward from the convex portion 6A. When the flange 6A is crushed by the ring 4A when the flange is fastened, the sealing performance is improved.

（２ｅ）上記実施形態における１つの構成要素が有する機能を複数の構成要素として分散させたり、複数の構成要素が有する機能を１つの構成要素に統合したりしてもよい。また、上記実施形態の構成の一部を省略してもよい。また、上記実施形態の構成の少なくとも一部を、他の上記実施形態の構成に対して付加、置換等してもよい。なお、特許請求の範囲に記載の文言から特定される技術思想に含まれるあらゆる態様が本開示の実施形態である。   (2e) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above-described embodiment may be added to or replaced with the configuration of another above-described embodiment. Note that all aspects included in the technical idea specified by the language described in the claims are embodiments of the present disclosure.

１…継手構造、２…配管、３…フランジ、３Ａ…開口、３Ｂ…中央領域、
３Ｃ…端部領域、３Ｄ…貫通孔、４…カラー、４Ａ…リング部、４Ｂ…筒状部、
４Ｃ…耳部、４Ｄ…貫通孔、５…溶接部、６…ガスケット、１０…排気マニホールド。 DESCRIPTION OF SYMBOLS 1 ... Joint structure, 2 ... Piping, 3 ... Flange, 3A ... Opening, 3B ... Central area,
3C: end region, 3D: through hole, 4: collar, 4A: ring portion, 4B: cylindrical portion,
4C: Ear, 4D: Through hole, 5: Weld, 6: Gasket, 10: Exhaust manifold.

Claims (2)

内燃機関から排出される排気ガスの流路を構成する配管を取り付けるための継手構造であって、
フランジと、
カラーと、
を備え、
前記フランジは、相手側フランジとガスケットを挟んで締結可能に構成されると共に、開口と中央領域とを有し、
前記開口は、前記配管が挿通可能であり、
前記中央領域は、前記開口から径方向外側に延びると共に、前記フランジの厚み方向へ凹み、
前記カラーは、前記フランジを構成する金属よりも耐腐食性が高い金属で構成されると共に、筒状部とリング部とを有し、
前記筒状部は、前記配管の外周面の全周を覆う形状を有すると共に、一端側において前記配管の外周面の全周に接合可能に構成され、
前記リング部は、前記筒状部の他端から連続し、少なくとも前記ガスケットの開口部よりも径方向外側へ延びるように構成されると共に、前記中央領域において前記フランジと接合され、
前記カラーは、前記リング部から前記配管の径方向外側に突出する少なくとも１つの耳部をさらに有し、
前記少なくとも１つの耳部には、それぞれ貫通孔が設けられる、配管の継手構造。 A joint structure for mounting a pipe constituting a flow path of exhaust gas discharged from the internal combustion engine,
A flange,
Color and
With
The flange is configured to be fastened with a mating flange and a gasket therebetween, and has an opening and a central region,
The opening, through which the pipe can be inserted,
The central region extends radially outward from the opening, and is recessed in a thickness direction of the flange,
The collar is made of a metal having higher corrosion resistance than the metal forming the flange, and has a cylindrical portion and a ring portion,
The tubular portion has a shape covering the entire circumference of the outer peripheral surface of the pipe, and is configured to be able to be joined to the entire circumference of the outer peripheral surface of the pipe at one end side,
The ring portion is continuous from the other end of the tubular portion, is configured to extend at least radially outward from the opening of the gasket, and is joined to the flange in the central region ,
The collar further includes at least one ear protruding radially outward of the pipe from the ring portion,
The pipe joint structure, wherein the at least one ear portion is provided with a through hole . 請求項１に記載の配管の継手構造であって、
前記配管は、排気再循環流路を構成する、配管の継手構造。 The joint structure for a pipe according to claim 1,
A pipe joint structure, wherein the pipe forms an exhaust gas recirculation flow path;
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