JP3940497B2 - Exhaust pipe assembly structure - Google Patents

Exhaust pipe assembly structure Download PDF

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Publication number
JP3940497B2
JP3940497B2 JP12696298A JP12696298A JP3940497B2 JP 3940497 B2 JP3940497 B2 JP 3940497B2 JP 12696298 A JP12696298 A JP 12696298A JP 12696298 A JP12696298 A JP 12696298A JP 3940497 B2 JP3940497 B2 JP 3940497B2
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Japan
Prior art keywords
exhaust pipe
upstream
mating surface
downstream
small holes
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JP12696298A
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JPH11324668A (en
Inventor
俊憲 長井
雅善 丹下
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Sango Co Ltd
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Sango Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は例えばデュアルエキゾーストパイプをシングルエキゾーストパイプに連結する場合のような排気管の集合部構造の改良に関する。
【０００２】
【従来の技術】
排気管の集合部構造として、複数の上流側排気管の下流端部に合せ面を形成し、該合せ面同士を整合して下流側排気管に挿嵌し固着したものが知られている。このような集合部においては、流入する排気ガスの干渉によって異音が発生するため、上流側排気管の各合せ面に小孔を設けて異音を抑制することが実開昭６１−２０４９１５号に開示されている。
【０００３】
【発明が解決しようとする課題】
しかし、各合せ面の小孔の位置を一致させないと小孔が閉塞されて異音の抑制が十分にできないという問題点が発生する。また各合せ面の小孔の位置を一致させるには、高い部品精度及び組付精度が必要であり、それに伴う製造面でのコストアップを招くという問題点がある。
【０００４】
そこで、本発明はこれ等の問題点を解消できる排気管の集合構造を提供することを目的とする。
【０００５】
【課題を解決するための手段】
前記目的を達成するために、請求項１の発明は、
複数の上流側排気管の各下流端部に合せ面を形成し、該合せ面を整合して１つの下流側排気管に挿嵌する排気管の集合部において、一方の上流側排気管の合せ面に多数の小孔を設けると共に、他方の上流側排気管の合せ面の前記多数の小孔に対向する部分に切欠きを設けたことを特徴とする排気管の集合部構造である。
【０００６】
請求項２の発明は、複数の上流側排気管の各下流端部に合せ面を形成し、該合せ面を整合して１つの下流側排気管に挿嵌する排気管の集合部において、一方の上流側排気管の合せ面に多数の小孔を設けると共に、他方の上流側排気管の合せ面の全面に切欠きを設けたことを特徴とする排気管の集合部構造である。
【０００７】
そして請求項３の発明は、２本の上流側排気管に、合せ面を有し下流側排気管と略同軸方向に指向する断面略半円形の下流端部を形成し、該２本の下流端部を、前記合せ面を整合して１つの下流側排気管に挿嵌し、一方の上流側排気管の挿入代を他方の上流側排気管の挿入代より長く設定すると共に、前記一方の上流側排気管の挿入代のうち前記他方の上流側排気管の挿入代の長さよりも長い差部の合せ面に多数の小孔を設けたことを特徴とする排気管の集合部構造である。
【０００８】
【発明の実施の形態】
次に本発明の好ましい実施の形態を図面の実施例に従って説明する。
〔実施例１〕
図１（ａ）〜（ｅ）のように、上流側排気管１，２の各下流端部を断面略半円形に成型し、それぞれ合せ面１ａ，２ａを形成する。
【０００９】
一方の上流側排気管２の合せ面２ａの下流端部に略半円状の切欠き５を設ける。
合せ面１ａのうち、切欠き５に対向する部分に小孔４を複数個設ける。
【００１０】
両合せ面１ａと２ａを整合させて、２本の上流側排気管の下流端を下流側排気管３に挿嵌し、固着・連結する。
〔実施例２〕
図２（ａ）〜（ｅ）のように、上流側排気管１，２の各下流端部を断面略半円形に成型し、それぞれ合せ面１ａ，２ａを形成する。一方の上流側排気管２の合せ面２ａの略全面に切欠き５を設ける。結果的に合せ面２ａは殆ど無くなるわけである。なお、同図（ａ）〜（ｅ）では、上流側排気管２の合せ面２ａに設けた切欠き５が同図（ｂ）（ｃ）及び（ｅ）に表れているが、合せ面２ａ自体は表れていない。同図（ｃ）に括弧を付けた符号２ａが切欠き５の部分に併記してあるが、この符号（２ａ）を付けた部分の合せ面自体は切欠き５を設けたことで既にほぼ無くなっている。換言すれば、前記一方の上流側排気管２の合せ面２ａは、製造工程のうち切欠き５を設ける前の工程で一時的に形成されていて、切欠き５を設けたあと、合せ面２ａのうちの残った、いわば周辺部（２ａ）が他方の合せ面１ａと対向するように両上流側排気管を組み付ける。
【００１１】
もっとも、組み付ける前に合せ面１ａの略全面に小孔４を複数個設ける。
最後に合せ面１ａと切欠き５（又は前記周辺部（２ａ））とを整合させ、両上流側排気管１，２の下流端部を下流側排気管３の上流端部に挿嵌し固着する。
【００１２】
〔実施例３〕
図３（ａ）〜（ｅ）に従って実施例３を説明する。
上流側排気管１，２の下流端部を断面が略半円形になるように成型し、それぞれ合せ面１ａ，２ａを形成する。
【００１３】
合せ面１ａの排気管１の軸方向長さを合せ面２ａの排気管２の軸方向長さよりも長く設定する。合せ面１ａの長さの合せ面２ａの長さより大きい部分（いわば差部）に符号６を付けてある。
【００１４】
合せ面１ａの下流端部の前記差部６に小孔４を複数個設ける。
それぞれの合せ面１ａ，２ａを整合させ、下流側排気管３に挿嵌し固着する。なお、差部６に対向整合させるべき合せ面２ａの部分は存在しない。この差部６の長さは任意に設定するものである。
【００１５】
〔実施例４〕
次に図４（ａ）〜（ｅ）に従って実施例４を説明する。
上流側排気管１，２の下流端部を断面略半円形に成型し、それぞれに合せ面１ａ，２ａを形成する。
【００１６】
合せ面２ａの下流端部に角状のコの字形切欠き５を設ける。
合せ面１ａのうち、切欠き５に対向する部分に小孔４を複数個設ける。
合せ面１ａと２ａを整合させた状態で両上流側排気管の下流端を下流側排気管３に挿嵌し、固着・連結する。
【００１７】
上記各実施例においては、上流側排気管１，２の下流端部を断面略半円形に成型して円形の下流側排気管に挿嵌したが、下流側排気管３の上流端部を楕円形に成型し、上流側排気管１，２の下流端部を楕円を等分した形状に成型し挿嵌してもよい。
【００１８】
また、上記実施例においては、合せ面１ａ，２ａを平面としたが、必ずしも平面に限ることはなく、熱応力の吸収や位置合せのために凹凸を設けてもよい。更に、上流側排気管３の本数や小孔４の数及び径は任意に設定するものである。
【００１９】
【発明の効果】
本発明の排気管の集合部構造は上述のように構成されているので、上流側排気管が切欠き部を除いて互いに面接触した状態で固着されるため、固着部に応力集中が生じなくて強度的に有利である。
【００２０】
また、両合せ面の小孔同士の位置を一致させる必要がなく、小孔が閉塞されることがないので、異音の抑制が確実にできる。そして、各合せ面の小孔同士の位置を一致させなくてもよいので、高い部品精度及び組付精度が不要となり、そのぶん製造面でのコストダウンが期待できる。
【００２１】
更に、請求項２の発明は、小孔をより多く設定できるため異音の抑制の効果が大きい。また、合せ面に高い面精度を必要としないため、より容易に製造できる。
【００２２】
そして、請求項３の発明は、上流側排気管同士の長さを変えるだけで、切欠きを設ける工程が必要ないため、一層容易に製造できる。
【図面の簡単な説明】
【図１】本発明の実施例１を説明する図で、（ａ）は下流側排気管を組み付けてない状態の斜視図、（ｂ）は両上流側排気管の横断面図、（ｃ）は組み付け状態の要部平面図、（ｄ）は（ｃ）のＡ−Ａ断面図、（ｅ）は（ｃ）のＢ−Ｂ断面図である。
【図２】本発明の実施例２を説明する図で、（ａ）は下流側排気管を組み付けてない状態の斜視図、（ｂ）は両上流側排気管の横断面図、（ｃ）は組み付け状態の要部平面図、（ｄ）は（ｃ）のＡ−Ａ断面図、（ｅ）は（ｃ）のＢ−Ｂ断面図である。
【図３】本発明の実施例３を説明する図で、（ａ）は下流側排気管を組み付けてない状態の斜視図、（ｂ）は両上流側排気管の横断面図、（ｃ）は組み付け状態の要部平面図、（ｄ）は（ｃ）のＡ−Ａ断面図、（ｅ）は（ｃ）のＢ−Ｂ断面図である。
【図４】本発明の実施例４を説明する図で、（ａ）は下流側排気管を組み付けてない状態の斜視図、（ｂ）は両上流側排気管の横断面図、（ｃ）は組み付け状態の要部平面図、（ｄ）は（ｃ）のＡ−Ａ断面図、（ｅ）は（ｃ）のＢ−Ｂ断面図である。
【符号の説明】
１，２ 上流側排気管
１ａ，２ａ 合せ面
３ 下流側排気管
４ 小孔
５ 切欠き[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in an exhaust pipe assembly structure, for example, when a dual exhaust pipe is connected to a single exhaust pipe.
[0002]
[Prior art]
As an assembly structure of exhaust pipes, a structure is known in which mating surfaces are formed at the downstream end portions of a plurality of upstream exhaust pipes, and the mating surfaces are aligned and inserted into and fixed to the downstream exhaust pipe. In such a gathering portion, abnormal noise is generated due to interference of inflowing exhaust gas. Therefore, it is possible to suppress abnormal noise by providing a small hole in each mating surface of the upstream exhaust pipe. Is disclosed.
[0003]
[Problems to be solved by the invention]
However, if the positions of the small holes on the mating surfaces are not matched, the small holes are closed, and abnormal noise cannot be sufficiently suppressed. In addition, in order to match the positions of the small holes on each mating surface, high component accuracy and assembly accuracy are required, and there is a problem in that this leads to an increase in manufacturing cost.
[0004]
Therefore, an object of the present invention is to provide an exhaust pipe assembly structure that can eliminate these problems.
[0005]
[Means for Solving the Problems]
In order to achieve the object, the invention of claim 1
A mating surface is formed at each downstream end of a plurality of upstream exhaust pipes, and the matching of the mating surfaces is combined with one upstream exhaust pipe in an assembly of exhaust pipes that are inserted into one downstream exhaust pipe. The exhaust pipe collective portion structure is characterized in that a large number of small holes are provided on the surface, and notches are provided in a portion of the mating surface of the other upstream exhaust pipe facing the multiple small holes.
[0006]
The invention according to claim 2 is a method of forming a mating surface at each downstream end portion of a plurality of upstream exhaust pipes, aligning the mating surfaces, and inserting into one downstream exhaust pipe. The exhaust pipe assembly portion structure is characterized in that a number of small holes are provided on the mating surface of the upstream exhaust pipe and a notch is provided on the entire mating surface of the other upstream exhaust pipe.
[0007]
And the invention of claim 3, the upstream exhaust pipe 2, to form a cross section semi-circular downstream end directed substantially coaxially with the downstream exhaust pipe having a mating surface, said two downstream the ends, in alignment with the mating surface and fitted into a single downstream exhaust pipe, and sets the insertion length of one upstream exhaust pipe other longer than insertion length of the upstream-side exhaust pipe, the one The exhaust pipe assembly portion structure is characterized in that a large number of small holes are provided in the mating surface of the difference portion longer than the length of the insertion allowance of the other upstream exhaust pipe among the insertion allowances of the upstream exhaust pipe. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to examples of the drawings.
[Example 1]
As shown in FIGS. 1A to 1E, the downstream end portions of the upstream side exhaust pipes 1 and 2 are formed in a substantially semicircular cross section to form mating surfaces 1a and 2a, respectively.
[0009]
A substantially semicircular cutout 5 is provided at the downstream end of the mating surface 2 a of one upstream exhaust pipe 2.
A plurality of small holes 4 are provided in a portion of the mating surface 1 a facing the notch 5.
[0010]
Both the mating surfaces 1a and 2a are aligned, and the downstream ends of the two upstream exhaust pipes are inserted into the downstream exhaust pipe 3 to be fixed and connected.
[Example 2]
As shown in FIGS. 2A to 2E, the downstream end portions of the upstream side exhaust pipes 1 and 2 are molded into a substantially semicircular cross section to form mating surfaces 1a and 2a, respectively. A notch 5 is provided on substantially the entire mating surface 2a of the one upstream exhaust pipe 2. As a result, the mating surface 2a is almost eliminated. In addition, in the same figure (a)-(e), although the notch 5 provided in the mating surface 2a of the upstream side exhaust pipe 2 appears in the figure (b) (c) and (e), the mating surface 2a It does not appear itself. In FIG. 2C, reference numeral 2a with parentheses is written along the notch 5, but the mating surface of the part with reference numeral (2a) is already almost eliminated by providing the notch 5. ing. In other words, the mating surface 2a of the one upstream exhaust pipe 2 is temporarily formed in the manufacturing process before the notch 5 is provided, and after the notch 5 is provided, the mating surface 2a The upstream exhaust pipes are assembled so that the so-called peripheral portion (2a) remains facing the other mating surface 1a.
[0011]
However, a plurality of small holes 4 are provided on substantially the entire mating surface 1a before assembly.
Finally, the mating surface 1a and the notch 5 (or the peripheral portion (2a)) are aligned, and the downstream ends of the upstream exhaust pipes 1 and 2 are inserted into the upstream end of the downstream exhaust pipe 3 and fixed. To do.
[0012]
Example 3
A third embodiment will be described with reference to FIGS.
The downstream end portions of the upstream side exhaust pipes 1 and 2 are molded so as to have a substantially semicircular cross section, and the mating surfaces 1a and 2a are formed, respectively.
[0013]
The axial length of the exhaust pipe 1 of the mating surface 1a is set longer than the axial length of the exhaust pipe 2 of the mating surface 2a. Reference numeral 6 is attached to a portion (so-called difference portion) that is longer than the length of the mating surface 2a of the mating surface 1a.
[0014]
A plurality of small holes 4 are provided in the difference portion 6 at the downstream end of the mating surface 1a.
The mating surfaces 1a and 2a are aligned, and are inserted into and fixed to the downstream exhaust pipe 3. Note that there is no portion of the mating surface 2a to be opposed to the difference portion 6. The length of the difference portion 6 is arbitrarily set.
[0015]
Example 4
Next, Example 4 will be described with reference to FIGS.
The downstream ends of the upstream side exhaust pipes 1 and 2 are molded into a substantially semicircular cross section, and the mating surfaces 1a and 2a are formed respectively.
[0016]
A square U-shaped notch 5 is provided at the downstream end of the mating surface 2a.
A plurality of small holes 4 are provided in a portion of the mating surface 1 a facing the notch 5.
With the mating surfaces 1a and 2a aligned, the downstream ends of both upstream exhaust pipes are inserted into the downstream exhaust pipe 3, and fixed and connected.
[0017]
In each of the above embodiments, the downstream end of the upstream side exhaust pipes 1 and 2 is molded into a substantially semicircular cross section and inserted into the circular downstream side exhaust pipe, but the upstream end of the downstream side exhaust pipe 3 is elliptical. It may be molded into a shape, and the downstream end portions of the upstream side exhaust pipes 1 and 2 may be molded into an elliptical shape and inserted.
[0018]
Moreover, in the said Example, although the mating surfaces 1a and 2a were made into the plane, it is not necessarily restricted to a plane, You may provide an unevenness | corrugation for absorption and alignment of a thermal stress. Further, the number of the upstream exhaust pipes 3 and the number and diameter of the small holes 4 are arbitrarily set.
[0019]
【The invention's effect】
Since the exhaust pipe assembly portion structure of the present invention is configured as described above, the upstream exhaust pipe is fixed in a state of being in surface contact with each other except for the notch portion, so that stress concentration does not occur in the fixed portion. This is advantageous in terms of strength.
[0020]
Moreover, it is not necessary to match the positions of the small holes on the mating surfaces, and the small holes are not blocked, so that noise can be reliably suppressed. And since it is not necessary to make the position of the small holes of each mating surface correspond, high component accuracy and assembly accuracy become unnecessary, and the cost reduction on the manufacturing side can be expected.
[0021]
Furthermore, since the invention of claim 2 can set more small holes, the effect of suppressing abnormal noise is great. Further, since high surface accuracy is not required for the mating surfaces, it can be manufactured more easily.
[0022]
The invention of claim 3 can be manufactured more easily because only the length of the upstream side exhaust pipes is changed and the step of providing the notch is not required.
[Brief description of the drawings]
FIGS. 1A and 1B are views for explaining a first embodiment of the present invention, in which FIG. 1A is a perspective view in a state where a downstream exhaust pipe is not assembled, FIG. 1B is a cross-sectional view of both upstream exhaust pipes, and FIG. Is a plan view of the main part in the assembled state, (d) is a cross-sectional view taken along line AA in (c), and (e) is a cross-sectional view taken along line BB in (c).
FIGS. 2A and 2B are diagrams illustrating a second embodiment of the present invention, in which FIG. 2A is a perspective view in a state where a downstream exhaust pipe is not assembled, FIG. 2B is a cross-sectional view of both upstream exhaust pipes, and FIG. Is a plan view of the main part in the assembled state, (d) is a cross-sectional view taken along line AA in (c), and (e) is a cross-sectional view taken along line BB in (c).
FIGS. 3A and 3B are diagrams illustrating a third embodiment of the present invention, in which FIG. 3A is a perspective view in a state where a downstream exhaust pipe is not assembled, FIG. 3B is a cross-sectional view of both upstream exhaust pipes, and FIG. Is a plan view of the main part in the assembled state, (d) is a cross-sectional view taken along line AA in (c), and (e) is a cross-sectional view taken along line BB in (c).
4A and 4B are diagrams for explaining a fourth embodiment of the present invention, in which FIG. 4A is a perspective view in a state where no downstream exhaust pipe is assembled, FIG. 4B is a cross-sectional view of both upstream exhaust pipes, and FIG. Is a plan view of the main part in the assembled state, (d) is a cross-sectional view taken along line AA in (c), and (e) is a cross-sectional view taken along line BB in (c).
[Explanation of symbols]
1, 2 Upstream exhaust pipe 1a, 2a Mating surface 3 Downstream exhaust pipe 4 Small hole 5 Notch

Claims (3)

複数の上流側排気管の各下流端部に合せ面を形成し、該合せ面を整合して１つの下流側排気管に挿嵌する排気管の集合部において、一方の上流側排気管の合せ面に多数の小孔を設けると共に、他方の上流側排気管の合せ面の前記多数の小孔に対向する部分に切欠きを設けたことを特徴とする排気管の集合部構造。A mating surface is formed at each downstream end portion of the plurality of upstream exhaust pipes, and the mating surfaces are aligned, and in the collective portion of the exhaust pipes that are inserted into one downstream exhaust pipe, one upstream exhaust pipe is aligned. An exhaust pipe assembly structure characterized in that a large number of small holes are provided on a surface, and a notch is provided in a portion of the mating surface of the other upstream exhaust pipe facing the multiple small holes. 複数の上流側排気管の各下流端部に合せ面を形成し、該合せ面を整合して１つの下流側排気管に挿嵌する排気管の集合部において、一方の上流側排気管の合せ面に多数の小孔を設けると共に、他方の上流側排気管の合せ面の全面に切欠きを設けたことを特徴とする排気管の集合部構造。A mating surface is formed at each downstream end portion of the plurality of upstream exhaust pipes, and the mating surfaces are aligned, and in the collective portion of the exhaust pipes that are inserted into one downstream exhaust pipe, one upstream exhaust pipe is aligned. An exhaust pipe assembly portion structure characterized in that a large number of small holes are provided on the surface, and notches are provided on the entire surface of the mating surface of the other upstream exhaust pipe. ２本の上流側排気管に、合せ面を有し下流側排気管と略同軸方向に指向する断面略半円形の下流端部を形成し、該２本の下流端部を、前記合せ面を整合して１つの下流側排気管に挿嵌し、一方の上流側排気管の挿入代を他方の上流側排気管の挿入代より長く設定すると共に、前記一方の上流側排気管の挿入代のうち前記他方の上流側排気管の挿入代の長さよりも長い差部の合せ面に多数の小孔を設けたことを特徴とする排気管の集合部構造。 The two upstream exhaust pipes are formed with a downstream end portion having a substantially semicircular cross section that has a mating surface and is oriented substantially coaxially with the downstream exhaust pipe , and the two downstream end portions are connected to the mating surface. aligned with fitted into one downstream exhaust pipe, the insertion length of one upstream exhaust pipe as well as longer than insertion length of the other of the upstream side exhaust pipe, the upstream exhaust pipe of the one insertion length An exhaust pipe assembly part structure characterized in that a large number of small holes are provided in the mating surface of the difference part longer than the length of the insertion allowance of the other upstream exhaust pipe.
JP12696298A 1998-05-11 1998-05-11 Exhaust pipe assembly structure Expired - Lifetime JP3940497B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015140210A1 (en) * 2014-03-20 2015-09-24 Tenneco Gmbh Manifold
US10584627B2 (en) 2015-09-22 2020-03-10 Tenneco Gmbh Manifold

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100525766B1 (en) * 2004-08-20 2005-11-02 세종공업 주식회사 Front muffler
DE102009032553A1 (en) † 2009-07-10 2011-01-20 J. Eberspächer GmbH & Co. KG Exhaust system and associated connection arrangement for an actuator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015140210A1 (en) * 2014-03-20 2015-09-24 Tenneco Gmbh Manifold
US10584627B2 (en) 2015-09-22 2020-03-10 Tenneco Gmbh Manifold

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