JP5751797B2 - Exhaust pipe welded structure - Google Patents
Exhaust pipe welded structure Download PDFInfo
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- JP5751797B2 JP5751797B2 JP2010236777A JP2010236777A JP5751797B2 JP 5751797 B2 JP5751797 B2 JP 5751797B2 JP 2010236777 A JP2010236777 A JP 2010236777A JP 2010236777 A JP2010236777 A JP 2010236777A JP 5751797 B2 JP5751797 B2 JP 5751797B2
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- 238000003466 welding Methods 0.000 claims description 34
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000035882 stress Effects 0.000 description 28
- 210000003371 toe Anatomy 0.000 description 19
- 238000010276 construction Methods 0.000 description 11
- 239000011324 bead Substances 0.000 description 10
- 239000002184 metal Substances 0.000 description 9
- 239000012141 concentrate Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000010409 ironing Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- Exhaust Silencers (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
本発明は、取付フランジを介してエンジンに取り付けられる排気集合管に係り、低コストにより取付フランジとの間の溶接部の疲労強度を向上させることのできる排気集合管の溶接構造に関するものである。 The present invention relates to an exhaust collecting pipe that is attached to an engine via a mounting flange, and relates to a welding structure for an exhaust collecting pipe that can improve the fatigue strength of a welded portion between the mounting flange and the mounting flange at a low cost.
一般に、溶接部では部材の厚さが不連続になるので、応力が集中しやすい構造となる。特に、溶接止端部などは応力の集中が著しい。また、応力の集中により溶接金属部分や、その周辺の母材に疲労亀裂等が生ずる場合もあり、従来から問題となっている。 In general, since the thickness of the member becomes discontinuous at the welded portion, the stress is likely to concentrate. In particular, stress concentration is significant at the weld toe. In addition, fatigue cracks or the like may occur in the weld metal part and the surrounding base material due to the concentration of stress, which has been a problem in the past.
図４は、エンジンの排気口への取付に設けられる取付フランジ１００と、この取付フランジ１００に溶接された排気集合管１１０との溶接部１２０の周辺を示した断面図である。 FIG. 4 is a cross-sectional view showing the periphery of a welded portion 120 between a mounting flange 100 provided for mounting to an exhaust port of an engine and an exhaust collecting pipe 110 welded to the mounting flange 100.
取付フランジ１００には、エンジンからの排気が通過する開口部１００ｂの周縁から、フランジ面１００ａに対して略垂直方向に向かって突出するように筒状の縦壁部１００ｃが形成されている。図４では、この縦壁部１００ｃの先端の内側に、排気集合管１１０の一つの枝管１１０ａの先端が挿入された状態が示され、両者の接合部を覆うように溶接されているのが分かる。 A cylindrical vertical wall portion 100c is formed on the mounting flange 100 so as to protrude in a direction substantially perpendicular to the flange surface 100a from the periphery of the opening portion 100b through which exhaust from the engine passes. FIG. 4 shows a state in which the distal end of one branch pipe 110a of the exhaust collecting pipe 110 is inserted inside the distal end of the vertical wall portion 100c, and welding is performed so as to cover the joint portion between them. I understand.
一般に、エンジンの排気集合管１１０には、様々な振動が伝わる。そして、この排気集合管１１０の振動により、取付フランジ１００との溶接部１２０にストレスが生じる。また、エンジンの動作中は、常にエンジンからの断続的な排気により排気脈流が生じ、これに基づく振動が上記溶接部１２０にストレスを与える。さらに、排気熱による熱応力や熱疲労によるストレス、加熱冷却が繰り返されることによるヒートショックによるストレスなども上記溶接部１２０には加えられる。この結果、溶接止端部１２６などへの応力の集中により、溶接金属や、この溶接金属の周辺部に疲労亀裂を生じさせる場合がある。 In general, various vibrations are transmitted to the exhaust collecting pipe 110 of the engine. Then, the vibration of the exhaust collecting pipe 110 causes stress in the welded portion 120 with the mounting flange 100. Further, during the operation of the engine, an exhaust pulsation flow is always generated due to intermittent exhaust from the engine, and vibrations based on this cause stress on the welded portion 120. Further, thermal stress due to exhaust heat, stress due to thermal fatigue, stress due to heat shock due to repeated heating and cooling, and the like are also applied to the welded portion 120. As a result, the stress concentration on the weld toe portion 126 or the like may cause fatigue cracks in the weld metal or the periphery of the weld metal.
そこで、従来から、溶接部を補強し、疲労強度を向上させる構造が考えられている。その一つとして、同一箇所に溶接ビードを盛り付ける増し溶接が知られている。 Thus, conventionally, a structure that reinforces the welded portion and improves fatigue strength has been considered. As one of them, additional welding in which a weld bead is placed at the same location is known.
図５は、従来の増し溶接による施工方法について、各工程を断面図で示している。ここに示した施工方法によれば、図４の溶接止端部１２６の周辺のような、硬さ分布の著しい変化を緩和させる構造を形成することができる。すなわち、図４の溶接止端部１２６では、一般に溶接金属から母材へと急激に硬さ分布が変化するが、ここで図５に示す構成では、溶接ビード１２２ａ（溶接金属）の上に溶接止端部１２２ｃが形成されているので、少なくとも、溶接止端部１２２ｃの周辺における硬さ分布の変化は緩やかなものとなる。以下に、図５（ａ）〜（ｃ）を参照しながら施工方法について説明を行う。 FIG. 5 is a cross-sectional view showing each process in a conventional construction method using incremental welding. According to the construction method shown here, it is possible to form a structure such as the periphery of the weld toe portion 126 in FIG. That is, in the weld toe portion 126 in FIG. 4, the hardness distribution generally changes suddenly from the weld metal to the base metal. However, in the configuration shown in FIG. 5, the weld is welded onto the weld bead 122a (weld metal). Since the toe portion 122c is formed, at least the change in the hardness distribution around the weld toe portion 122c becomes gradual. Below, a construction method is demonstrated, referring FIG. 5 (a)-(c).
ここに示した施工方法によれば、鋼板１３０に対して被溶接部材１４０を溶接する前に、予め溶接止端部１２２ｃの基礎となる溶接ビード１２２ａを配置するための溝加工が、図５（ａ）に示すように、鋼板１３０側に施される。そして、図５（ｂ）に示す工程では、図５（ａ）で形成された溝１３０ａに対して予備の溶接ビード１２２ａが配置される。続いて、図５（ｃ）に示す工程では、溶接ビード１２２ａの中央付近を含むように、すなわち、予備的に配置した溶接ビード１２２ａの中央付近に、本溶接（隅肉溶接）の止端部１２２ｃが形成されるように、鋼板１３０と被溶接部材１４０とが溶接される。これにより、溶接止端部１２２ｃ周辺の応力の集中が緩和される。このような施工方法により形成される溶接構造の例は、特許文献１に記載がある。 According to the construction method shown here, before the welded member 140 is welded to the steel plate 130, the groove processing for arranging the weld bead 122a which is the foundation of the weld toe 122c in advance is performed as shown in FIG. As shown to a), it is given to the steel plate 130 side. In the step shown in FIG. 5B, a spare weld bead 122a is disposed in the groove 130a formed in FIG. Subsequently, in the step shown in FIG. 5C, the toe portion of the main welding (fillet welding) is included so as to include the vicinity of the center of the weld bead 122a, that is, in the vicinity of the center of the weld bead 122a that is preliminarily arranged. The steel plate 130 and the member to be welded 140 are welded so that 122c is formed. Thereby, the concentration of stress around the weld toe 122c is alleviated. An example of a welded structure formed by such a construction method is described in Patent Document 1.
しかしながら、上記の図５に示したような溶接構造によると、鋼板１３０と被溶接部材１４０とを溶接するための前処理として、予め鋼板１３０側に溝加工を施しておく工程が必要である。そして、さらに、この溝１３０ａに対して溶接ビード１２２ａを形成する工程が必要となる。このように、図５の構成では工数が増加し、施工コストが増大するとともに、生産性が著しく低下してしまう。 However, according to the welding structure as shown in FIG. 5 described above, as a pretreatment for welding the steel plate 130 and the member to be welded 140, a step of previously grooving the steel plate 130 side is necessary. Further, a process for forming the weld bead 122a in the groove 130a is required. Thus, in the configuration of FIG. 5, the number of man-hours increases, the construction cost increases, and the productivity is significantly reduced.
また、予備溶接ビード１２２ａを配置する際に、鋼板１３０に溶接変形が生じる可能性があり、このような変形が生じた場合には、本溶接における溶接精度が低下してしまう虞がある。 In addition, when the preliminary weld bead 122a is disposed, welding deformation may occur in the steel plate 130. When such deformation occurs, there is a possibility that the welding accuracy in the main welding may be reduced.
例えば、図４に示した構成において、排気集合管１１０を取付フランジ１００に溶接する前に、取付フランジ１００側に予備の溶接ビードを配置し、これが原因で溶接変形が生じてしまった場合、エンジンと取付フランジ１００との間に隙間が形成されてしまう場合もあり得る。その結果、形成された隙間から排気漏れが発生する虞も生じる。 For example, in the configuration shown in FIG. 4, before welding the exhaust collecting pipe 110 to the mounting flange 100, if a spare weld bead is disposed on the mounting flange 100 side and this causes welding deformation, the engine There may be a case where a gap is formed between the mounting flange 100 and the mounting flange 100. As a result, there is a possibility that exhaust leakage may occur from the formed gap.
そこで、上記の問題を解決するために、本発明では、溶接部の応力集中を緩和し、疲労強度を低コストで向上させることのできる排気集合管の溶接構造を提供することを目的とする。 Therefore, in order to solve the above problem, an object of the present invention is to provide a welded structure of an exhaust manifold that can alleviate stress concentration in a welded portion and improve fatigue strength at a low cost.
上記目的を達成するために、本発明の排気集合管の溶接構造は、エンジンの複数の排気口に対して排気集合管を取り付ける取付フランジに形成された開口部の、排気下流側フランジ面の周縁から略垂直に突出した筒状の縦壁部を介して取付フランジに溶接される排気集合管の溶接構造において、排気集合管は、枝管と集合部により形成され、排気下流側フランジ面には、縦壁部の立ち上がる隅部を囲むように、リング状の溝部が形成され、取付フランジと排気集合管の枝管とを溶接する溶接部は、排気集合管の枝管の端部と縦壁部とを溶接するプレ溶接部と、このプレ溶接部の隅部側止端部と隅部と溝部とを覆うように溶接する増し溶接部とから形成され、増し溶接部は、少なくとも、両外側に配置された開口部の周りに形成された溝部のうち、各々の外側半分の領域に属し、且つ、枝管が集まる集合部に近い側半分の領域に形成されていることを特徴とする。 In order to achieve the above object, the exhaust collecting pipe welding structure according to the present invention has a peripheral edge of an exhaust downstream flange surface of an opening formed in a mounting flange for attaching an exhaust collecting pipe to a plurality of exhaust ports of an engine. In the welded structure of the exhaust collecting pipe welded to the mounting flange through a cylindrical vertical wall projecting substantially vertically from the exhaust collecting pipe , the exhaust collecting pipe is formed by a branch pipe and a collecting portion, and the exhaust downstream flange surface is A ring-shaped groove is formed so as to surround the rising corner of the vertical wall, and the welded portion that welds the mounting flange and the branch pipe of the exhaust collecting pipe is connected to the end of the branch pipe of the exhaust collecting pipe and the vertical wall. A pre-welded portion that welds the portion, and a corner end toe portion of this pre-welded portion, and an additional weld portion that is welded so as to cover the corner portion and the groove portion. Grooves formed around the openings located in the , Belonging to each of the outer half of the region, and is characterized in that it is formed in a region near the side half collecting portion which branch gather.
このように構成すると、少なくとも、両外側に配置された排気開口部の周縁に形成された溝部のうち、各々の外側半分の領域に属し、且つ、排気集合管の集合部に近い側半分の領域に属する溝部に生じた応力が分散される。すなわち、複数配置された排気集合管の溶接部のうち最も応力が集中しやすい領域にあるプレ溶接部の溶接止端部を覆う増し溶接部を介して、取付フランジの隅部及び溝部へ応力が分散される。また、逆に、溝部に生じる応力は、増し溶接部を介して隅部及びプレ溶接部へ分散される。 If comprised in this way, it belongs to the area | region of each outer half among the groove parts formed in the periphery of the exhaust opening part arrange | positioned at both outer sides, and the area | region of the side half near the collection part of an exhaust collecting pipe The stress generated in the groove part belonging to is dispersed. In other words, stress is applied to the corners and grooves of the mounting flange via the additional welds that cover the weld toes of the pre-weld part in the region where stress is most likely to concentrate among the welds of the exhaust manifolds that are arranged in a plurality. Distributed. On the contrary, the stress generated in the groove is distributed to the corner and the pre-welded portion through the additional welded portion.
このように、応力の集中しやすい形状を有するプレ溶接部の止端部、溶接部のルート部である隅部、及び溝部同士が、増し溶接部により繋がるので、互いに応力の分散が可能となり、局所的に応力が集中することを緩和できる。 In this way, the toe part of the pre-welded part having a shape in which stress tends to concentrate, the corner part that is the root part of the welded part, and the groove parts are connected by the additional welded part, so that the stress can be dispersed with each other. It can relieve stress concentration locally.
以上説明したように、本発明によれば、筒状の縦壁部に溶接される排気集合管の溶接部のうち、応力の集中しやすい両外側の枝管に対応する溝部に対して、それぞれの外側及び集合部側の領域に配置された増し溶接部により、プレ溶接部の止端部や、溶接部のルート部である隅部や、溝部に生じる応力が分散されやすくなる。これにより、互いに応力が緩和されやすい構造が形成されるので、溶接部を形成する溶接金属や、溶接部周辺の母材に対する疲労亀裂の発生を低減することが可能となる。 As described above, according to the present invention, among the welded portions of the exhaust collecting pipe welded to the cylindrical vertical wall portion, each of the groove portions corresponding to the outer side branch pipes where stress is likely to concentrate, respectively. The additional welds arranged in the outer region and the region on the gathering part side easily disperse the stress generated in the toe part of the pre-weld part, the corner part that is the root part of the weld part, and the groove part. As a result, a structure in which stress is easily relaxed is formed, so that it is possible to reduce the occurrence of fatigue cracks in the weld metal forming the weld and the base metal around the weld.
また、溝部の外郭を溶接の基準として利用できるので、生産効率が向上する。 Moreover, since the outline of the groove can be used as a welding reference, the production efficiency is improved.
さらに、溝部のうち、特に、応力の集中しやすい領域のみを対象として増し溶接部を形成しておけば良いので、施工コストの低減を図ることができる。 Furthermore, it is only necessary to form a welded portion by increasing only the region where stress is likely to concentrate in the groove portion, so that the construction cost can be reduced.
（第１の実施の形態）
以下に、本発明の第１の実施の形態における排気集合管の取付フランジに対する溶接構造について、図１から図３を用いて説明を行う。
(First embodiment)
Below, the welding structure with respect to the attachment flange of the exhaust manifold in the 1st Embodiment of this invention is demonstrated using FIGS. 1-3.
先ず全体の構成を図１により示す。図１に示されるように、本実施の形態では、４つの排気口を有するエンジンに取り付けられる取付フランジ２及び排気集合管４を例として示している。排気集合管４は、４本の枝管４ａを有しており、それぞれ、取付フランジ２に接続されている。そしてこれら枝管４ａは、取付フランジ２のフランジ面２ａに対して略垂直方向（紙面手前方向）に延びつつ下方へ湾曲し、集合部４ｂにて集結している。この集合部４ｂよりも排気下流側の構成については、ここでは詳細な説明は省略する。 First, the entire configuration is shown in FIG. As shown in FIG. 1, in the present embodiment, a mounting flange 2 and an exhaust collecting pipe 4 that are attached to an engine having four exhaust ports are shown as an example. The exhaust collecting pipe 4 has four branch pipes 4 a and each is connected to the mounting flange 2. These branch pipes 4a are curved downward while extending in a direction substantially perpendicular to the flange surface 2a of the mounting flange 2 (the front side in the drawing), and are gathered at the gathering portion 4b. A detailed description of the configuration on the exhaust downstream side of the collecting portion 4b is omitted here.
次に、取付フランジ２に対して排気集合管４が溶接される溶接部６の構成について、外形の説明から断面構成の説明へと進める。 Next, regarding the configuration of the welded portion 6 to which the exhaust collecting pipe 4 is welded to the mounting flange 2, the description will proceed from the description of the outer shape to the description of the cross-sectional configuration.
先ず図２を参照して、この図では、図１の最も左側の枝管４ａの取付フランジ２に対する溶接部６の周辺が拡大して示されている。この図にて明らかなように、それぞれの枝管４ａは、プレ溶接部６ａにて取付フランジ２に溶接されている。しかし、最も外側の枝管４ａのみ、プレ溶接部６ａの外周に沿って増し溶接部６ｂが形成されている。ただし、この増し溶接部６ｂは、一点鎖線で示した垂直方向境界線８ａよりも外側の領域であり、且つ、水平方向境界線１０よりも下側の領域にのみ形成されている。 First, referring to FIG. 2, the periphery of the welded portion 6 with respect to the mounting flange 2 of the leftmost branch pipe 4 a in FIG. 1 is shown enlarged. As is apparent from this figure, each branch pipe 4a is welded to the mounting flange 2 by a pre-welded portion 6a. However, only the outermost branch pipe 4a is formed with an additional welded portion 6b along the outer periphery of the pre-welded portion 6a. However, this additional weld 6b is formed only in a region outside the vertical boundary line 8a indicated by the alternate long and short dash line and below the horizontal boundary line 10.
また、プレ溶接部６ａは、図に表れていない取付フランジ２の開口部２ｂと枝管４ａの先端とを溶接しており、増し溶接部６ｂは、プレ溶接部６ａの外周とこのプレ溶接部６ａの周囲に形成された溝部２ｅとを覆うように溶接されている。 Further, the pre-welded portion 6a welds the opening 2b of the mounting flange 2 not shown in the drawing and the tip of the branch pipe 4a, and the additional weld portion 6b includes the outer periphery of the pre-welded portion 6a and the pre-welded portion. It welds so that the groove part 2e formed in the circumference | surroundings of 6a may be covered.
ここで、図３の断面図を参照して、これらプレ溶接部６ａと増し溶接部６ｂとの構成を説明する。 Here, the configuration of the pre-welded portion 6a and the additional welded portion 6b will be described with reference to the cross-sectional view of FIG.
図３は、溶接部６の施工について、各工程を示した図である。先ず図３（ａ）は、取付フランジ２に対して排気集合管４の枝管４ａを配置した状態が示されている。この図に示されているように、取付フランジ２には、エンジンの排気口に繋がる開口部２ｂが形成されている。この図における排気の流れは、矢印３により示されている。開口部２ｂの周縁からは、排気下流側に向かって、フランジ面２ａに略垂直な方向に筒状の縦壁部２ｃが突出形成されている。ここで、本実施の形態における縦壁部２ｃは、しごき成形により形成されるものである。このため、縦壁部２ｃの周囲には、しごき成形の際に用いられる押さえ型による押さえ痕が溝部２ｅとして形成されている。このような形状の縦壁部２ｃに対して、排気集合管４の枝管４ａの先端が挿入配置される。 FIG. 3 is a diagram showing each process for the construction of the welded portion 6. First, FIG. 3A shows a state in which the branch pipe 4 a of the exhaust collecting pipe 4 is arranged with respect to the mounting flange 2. As shown in this figure, the mounting flange 2 is formed with an opening 2b connected to the exhaust port of the engine. The flow of exhaust in this figure is indicated by arrows 3. From the periphery of the opening 2b, a cylindrical vertical wall 2c is formed so as to protrude in a direction substantially perpendicular to the flange surface 2a toward the exhaust downstream side. Here, the vertical wall portion 2c in the present embodiment is formed by ironing. For this reason, a pressing mark by a pressing die used for ironing is formed as a groove 2e around the vertical wall 2c. The distal end of the branch pipe 4a of the exhaust collecting pipe 4 is inserted into the vertical wall portion 2c having such a shape.
そして、図３（ｂ）に示す次の工程では、縦壁部２ｃの先端と枝管４ａの先端とがプレ溶接により溶接される。ここで、プレ溶接部６ａの下方の止端部６ｃの周辺では、溶接金属から母材へと材質が変わるとともに、プレ溶接部６ａにより部材の厚さも大きく変化している。そのため、止端部６ｃの周辺に応力が集中しやすい形状が形成されている。本実施の形態では、この応力の集中を緩和するために、次の工程において増し溶接が行われる。 In the next step shown in FIG. 3B, the tip of the vertical wall 2c and the tip of the branch pipe 4a are welded by pre-welding. Here, in the vicinity of the toe portion 6c below the pre-welded portion 6a, the material is changed from the weld metal to the base material, and the thickness of the member is also greatly changed by the pre-welded portion 6a. Therefore, a shape in which stress tends to concentrate is formed around the toe portion 6c. In the present embodiment, additional welding is performed in the next step in order to alleviate this stress concentration.
図３（ｃ）に示す工程では、縦壁部２ｃ及びフランジ面２ａで構成された隅部２ｆと、溝部２ｅと、プレ溶接部６ａの隅部２ｆ側の止端部６ｃとが増し溶接部６ｂにより覆われる。これにより、プレ溶接部６ａの止端部６ｃは増し溶接部６ｂ内に埋没する。すなわち、元の隅部側止端部６ｃの周辺では、溶接金属の厚さがプレ溶接部６ａから増し溶接部６ｂへと緩やかに変化する構成になる。また、同一材質で連続面が形成されるので、硬さ分布も緩やかに変化している。これにより、プレ溶接部６ａの下側に生じる応力は、増し溶接部６ｂを介して隅部２ｆや溝部２ｅへ分散され、応力の集中が緩和される。したがって、溶接金属や、溶接部６の周辺の母材に生じる歪みも低減されるので、疲労亀裂等の発生を低減することが可能となる。 In the step shown in FIG. 3 (c), the corner 2f constituted by the vertical wall 2c and the flange surface 2a, the groove 2e, and the toe 6c on the corner 2f side of the pre-welded portion 6a are increased and the welded portion. 6b. As a result, the toe portion 6c of the pre-welded portion 6a is increased and buried in the welded portion 6b. That is, the thickness of the weld metal is increased from the pre-welded portion 6a to the welded portion 6b in the vicinity of the original corner side toe portion 6c. In addition, since the continuous surface is formed of the same material, the hardness distribution also changes gently. Thereby, the stress generated on the lower side of the pre-welded portion 6a is distributed to the corner portion 2f and the groove portion 2e via the increased weld portion 6b, and the concentration of stress is relaxed. Therefore, since distortion generated in the weld metal and the base metal around the welded portion 6 is also reduced, the occurrence of fatigue cracks and the like can be reduced.
さらに、しごき成形により形成されていた溝部２eにおいては、部材の厚さ変化が著しく、止端部６ｃと同様に応力の集中しやすい形状となっていたが、こちらも同時に増し溶接が施されたことにより緩和される。 Further, in the groove portion 2e formed by ironing, the thickness of the member is remarkably changed, and the shape tends to concentrate stress similarly to the toe portion 6c, but this is also increased and welded at the same time. Is alleviated.
なお、図３（ｃ）の溶接部６のうち、左側の領域にのみ増し溶接が施されている。 It should be noted that additional welding is applied only to the left region of the welded portion 6 in FIG.
次に、この理由について説明を行う。ここで、一旦図１に戻る。本実施の形態に示す排気集合管４は、取付フランジ２のフランジ面２ａから略垂直に延びた後、下方へ湾曲していることは上述した。一般に、エンジンには、排気脈流等を始めとする様々な振動が発生する。一方、排気系統は、集合部４ｂより下流側に触媒装置、マフラー及びテールパイプ等が一体的に接続され、広い範囲に亘って配管が引き回されている。このため、各部に発生した振動の影響を受けやすく、取付フランジ２と排気集合管４とを接続する溶接部６へもこれらの振動が伝達される。ここで、伝達されてくる振動は、一列に配列された枝管４ａのそれぞれに均等には現れない。本実施の形態に示したような構成の場合は、図１の垂直方向境界線８ａおよび８ｂのそれぞれの外側領域であり、且つ、水平方向境界線１０よりも下側の領域に最も大きく影響し、この領域に属する溶接部６の疲労耐久性が問題となる。そのため、本実施の形態では、これら応力の集中が最も生じやすい領域にのみ増し溶接を行い、プレ溶接部６ａを補強している。このように、補強箇所を必要最小限に抑えることにより、低コスト化を図ることができる。 Next, the reason will be described. Here, it returns to FIG. 1 once. As described above, the exhaust collecting pipe 4 shown in the present embodiment extends substantially vertically from the flange surface 2a of the mounting flange 2 and then curves downward. Generally, various vibrations such as an exhaust pulsating flow are generated in an engine. On the other hand, in the exhaust system, a catalyst device, a muffler, a tail pipe, and the like are integrally connected downstream from the collecting portion 4b, and piping is routed over a wide range. For this reason, it is easy to receive the influence of the vibration which generate | occur | produced in each part, and these vibrations are transmitted also to the welding part 6 which connects the attachment flange 2 and the exhaust collecting pipe 4. FIG. Here, the transmitted vibration does not appear equally in each of the branch pipes 4a arranged in a line. In the case of the configuration as shown in the present embodiment, it has the greatest influence on the outer region of each of the vertical boundary lines 8a and 8b in FIG. The fatigue durability of the weld 6 belonging to this region becomes a problem. Therefore, in the present embodiment, the pre-welded portion 6a is reinforced by performing additional welding only in the region where the stress concentration is most likely to occur. In this way, the cost can be reduced by minimizing the number of reinforcement points.
なお、増し溶接は、少なくとも、上述のような最も応力の集中が予想される領域にのみ施工されていれば、その他の領域に施工されていても構わない。すなわち、中央の２本の枝管４ａに対して増し溶接が行われていても良い。 It should be noted that the additional welding may be performed at least in other regions as long as it is performed only in the region where stress concentration is expected to be the highest. That is, additional welding may be performed on the two central branch pipes 4a.
また、施工の際には、しごき成形により形成されてしまう溝部２ｅを逆に利用し、その外形を溶接範囲の基準とすることにより、生産性を向上させることができる。 Moreover, in the case of construction, productivity can be improved by using the groove part 2e formed by ironing on the contrary and making the external shape the reference | standard of a welding range.
本発明の排気集合管の溶接構造は、内燃機関の排気集合管に対して利用できるのでガソリン車、ディーゼル車、ハイブリッド車等で利用することができる。 The welding structure of the exhaust collecting pipe of the present invention can be used for an exhaust collecting pipe of an internal combustion engine, so that it can be used in a gasoline vehicle, a diesel vehicle, a hybrid vehicle, and the like.
２ 取付フランジ
２ａ フランジ面
２ｂ 開口部
２ｃ 縦壁部
２ｄ 周縁
２ｅ 溝部
２ｆ 隅部
４ 排気集合管
４ｂ 集合部
６ 溶接部
６ａ プレ溶接部
６ｂ 増し溶接部
６ｃ 止端部
８ａ、８ｂ 垂直方向境界線
１０ 水平方向境界線
2 Mounting flange 2a Flange surface 2b Opening 2c Vertical wall 2d Periphery 2e Groove 2f Corner 4 Exhaust collecting pipe 4b Collecting part 6 Welding part 6a Pre-welding part 6b Additional welding part 6c Stop end part 8a, 8b Vertical boundary line 10 Horizontal border
Claims (1)
前記排気集合管は、枝管と集合部により形成され、
前記排気下流側フランジ面には、前記縦壁部の立ち上がる隅部を囲むように、リング状の溝部が形成され、
前記取付フランジと前記排気集合管の前記枝管とを溶接する溶接部は、前記排気集合管の前記枝管の端部と前記縦壁部とを溶接するプレ溶接部と、このプレ溶接部の隅部側止端部と前記隅部と前記溝部とを覆うように溶接する増し溶接部とから形成され、
前記増し溶接部は、少なくとも、両外側に配置された前記開口部の周りに形成された溝部のうち、各々の外側半分の領域に属し、且つ、前記枝管が集まる前記集合部に近い側半分の領域に形成されている
ことを特徴とする排気集合管の溶接構造。 The exhaust collecting pipe is attached to a plurality of exhaust ports of the engine, and is welded to the mounting flange via a cylindrical vertical wall portion protruding substantially perpendicularly to the flange surface from the periphery of the opening formed in the mounting flange. In the welding structure of the exhaust collecting pipe,
The exhaust collecting pipe is formed by a branch pipe and a collecting portion,
On the exhaust downstream flange surface, a ring-shaped groove is formed so as to surround the rising corner of the vertical wall,
The welded portion that welds the mounting flange and the branch pipe of the exhaust collecting pipe includes a pre-welded portion that welds an end portion of the branch pipe and the vertical wall portion of the exhaust collecting pipe , and Formed from a corner side toe, an additional weld that welds to cover the corner and the groove,
The widening weld least, of the formed groove around the opening disposed on both outer sides, belonging to each of the outer half of the region, and the side half closer to the collecting portion of the branch pipe gather An exhaust collecting pipe welded structure characterized by being formed in a region of
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