JP3457782B2 - Exhaust assembly structure - Google Patents
Exhaust assembly structureInfo
- Publication number
- JP3457782B2 JP3457782B2 JP30099295A JP30099295A JP3457782B2 JP 3457782 B2 JP3457782 B2 JP 3457782B2 JP 30099295 A JP30099295 A JP 30099295A JP 30099295 A JP30099295 A JP 30099295A JP 3457782 B2 JP3457782 B2 JP 3457782B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- pipes
- exhaust
- collecting
- exhaust pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】
【0001】
【発明の属する技術分野】本発明は、排気マニホールド
に接続された2本のパイプを通して排出される排気ガス
を1本のパイプに集合させる排気集合部の構造に関する
ものである。
【0002】
【従来の技術】排気マニホールドに接続された2本のパ
イプを1本のパイプに集合させる集合部は、図4に示す
ように構成されるのが一般である。即ち、一方の端部が
図示しない排気マニホールドのフランジに固定された2
本のパイプ51が所定の間隔を持って略平行に配置されて
いる。パイプ51の他方の端部は三叉状に成形された集合
パイプ52に夫々独立して嵌合されて溶接されている。こ
の集合パイプ52の下流側の端部にはパイプ53が接続され
ている。また集合パイプ52は、図5に示すように、上下
に配置された一対の成形体52a,52bを溶接して構成さ
れている。特に、集合パイプ52の上流側の端部は、独立
した2本のパイプ51に接続して気密性を保持するために
パイプ51の周囲に沿った眼鏡状に成形されている。
【0003】上記排気集合部の構造では、集合パイプ52
の形状が複雑であり且つ溶接線の軌跡が複雑となるた
め、コストを低減させるのに限度が生じるという問題が
ある。このため、本件出願人は2本のパイプ51を並列さ
せて端部どうしを夫々側面で溶接し、素管の端部を前記
パイプ51の接続形状に成形して該成形部に2本のパイプ
51を嵌合させて溶接することで、排気集合部を構成する
技術を開発して特許出願している(特開平5−1534
号)。
【0004】
【発明が解決しようとする課題】上記各技術に於いて、
一端が排気マニホールドに接続された2本のパイプ51は
互いに平行に配置されており、他端が平行状態を維持し
て集合パイプ52に接続される。このため、夫々のパイプ
51を通って排出された排気ガスは集合パイプ52内で干渉
して乱流や渦流が発生し、これに伴って放射音が生じる
という問題がある。
【0005】本発明の目的は、2本のパイプから排出さ
れた排気ガスの集合パイプ内に於ける排気干渉を低減さ
せて放射音の低減をはかることが出来る排気集合部の構
造を提供することにある。
【0006】
【課題を解決するための手段】上記課題を解決するため
に本発明に係る排気集合部の構造は、一端が排気マニホ
ールドに接続された2本のパイプを所定角度で屈折させ
て互いに他端部で当接させた上流側排気管と、内側素管
の一方の端部に外側素管を嵌装すると共に所定の長さ範
囲にわたってテーパ状に径を拡大して両素管を密着させ
且つ該密着部を前記上流側排気管に於ける2本のパイプ
を当接させた端部に於ける各パイプの周囲に沿った形状
と略三角形の平面形状に対応させて成形した下流側排気
管とを有し、下流側排気管の成形部に上流側排気管に於
ける2本のパイプの当接端部を嵌合して溶接したことを
特徴とするものである。
【0007】上記排気集合部の構造では、上流側排気管
を構成する2本のパイプが所定角度で屈折しており、こ
の結果、端部で互いに交差するように当接する。また下
流側排気管は、内側素管の端部に外側素管を嵌装して二
重管部分をテーパ状に径を拡大させて拡管することで両
素管を密着させ、この端部を上流側排気管に於ける2本
のパイプの当接端部の各パイプの周囲に沿った形状と略
三角形の平面形状に対応させて成形して構成される。
【0008】このため、下流側排気管の成形部に上流側
排気管を構成する2本のパイプの当接端部を嵌合して溶
接することで、2本のパイプから排出された排気ガスが
円滑に集合し得る排気集合部を構成することが出来る。
【0009】
【発明の実施の形態】以下、上記排気集合部の構造につ
いて図を用いて説明する。図1は排気集合部の構成を説
明する断面図、図2は上流側排気管と下流側排気管の関
係を説明する斜視図、図3は下流側排気管の製作工程を
説明する図である。
【0010】本発明に係る排気集合部の構造は、上流側
排気管Aを構成する一端が図示しない排気マニホールド
に接続された2本のパイプ1を介して流通する排気ガス
を円滑に集合させることで排気ガスの乱流や渦流の発生
を可及的に軽減させて騒音の発生を軽減させると共に、
下流側排気管Bに構成された排気ガスの集合部位を2本
の管を密着させて構成することで放射音を低減させるよ
うに構成したものである。
【0011】図1,図2に示すように、上流側排気管A
は、平行に配置された2本のパイプ1によって構成され
ている。各パイプ1の一方の端部は夫々図示しない排気
マニホールドのフランジに溶接されている。
【0012】平行に配置された2本のパイプ1の自由端
側は、点1aを中心として所定の角度で且つ端部1bが
互いに接近する方向に屈折しており、当接した端部1b
の側面が溶接されて屈折角度を維持すると共に形状が拘
束されている。夫々のパイプ1の屈折角度は、該パイプ
1を流通した排気ガスが無理なく集合することが可能
で、合流部位に乱流や渦流が発生することのない値に設
定されている。
【0013】下流側排気管Bは、上流側排気管Aに接続
されて各パイプ1を流通した排気ガスを集合させて図示
しない消音器やコンバーターに排出するものである。こ
の下流側排気管Bは、端部に形成された嵌合部2と、こ
の嵌合部2に連続して形成された集合部3と、集合部3
に連続して形成された排出部4を有して構成されてい
る。
【0014】嵌合部2は上流側排気管Aを構成する2本
のパイプ1の端部1bを嵌合させるものであり、2本の
パイプ1の互いに溶接された端部1bの周囲に沿った形
状を有している。
【0015】集合部3は2本のパイプ1から排出された
排気ガスを円滑に集合させて排出部4に排出させる機能
を有する。このため、集合部3は各パイプ1の管壁に沿
った壁面を有し、平面形状が略三角形に形成されてい
る。即ち、集合部3の幅方向の側壁(図1の左右方向の
側壁)は、各パイプ1の屈折角度と略等しい角度を有し
ており、上下方向の側壁は略平行に形成されている。
【0016】排出部4は、集合部3に連続して構成さ
れ、該集合部3で集合した排気ガスを消音器やコンバー
ターに排出させるものである。
【0017】上記下流側排気管Bは内側素管5と外側素
管6からなり、嵌合部2及び集合部3は内側素管5と外
側素管6を密着させた二重管構造として形成されてお
り、排出部4は内側素管5による一重管構造として形成
されている。
【0018】次に、下流側排気管Bの製作手順について
図3により説明する。同図(a)に示すように、目的の
下流側排気管Bのサイズに応じて予め設定された径と長
さを有する内側素管5及び外側素管6を用意し、外側素
管6に内側素管5の一方の端部側を挿入して両素管5,
6の管端を一致させる。
【0019】次いで、同図(b)に示すように、内側素
管5と外側素管6による二重管部分を所定の長さ範囲に
わたってテーパ状に径を拡大させる所謂拡管し、内側素
管5と外側素管6を密着させる。内側素管5の外側素管
6との密着部分から連続する一重管部分は径を縮小させ
る所謂縮管し、この縮管部分によって排出部4を形成す
る。
【0020】更に、同図(c)に示すように、拡管して
内側素管5と外側素管6を密着させた密着二重管部分を
プレス成形し、上流側排気管Aの2本のパイプ1が接続
された端部1bに沿った形状に成形して嵌合部2と集合
部3を形成する。
【0021】上記の如くして製作された下流側排気管B
の嵌合部2に上流側排気管Aのパイプ1の端部1bを嵌
合させ、その後、両排気管A,Bの接合部位を溶接する
ことで、排気集合部を構成することが可能である。
【0022】上記排気集合部の構造では、上流側排気管
Aを構成する2本のパイプ1を流通した排気ガスは、該
パイプ1に設定された点1aを通過した後、パイプ1の
屈折角度に従って接近し、端部1bから下流側排気管B
の集合部3に流通して集合する。このとき、パイプ1の
端部1bが互いに側面で当接しているため、集合部3に
流通する排気ガスに発生する乱流や渦流を可及的に軽減
させることが可能となり、騒音の発生を軽減させること
が可能となる。
【0023】また2本のパイプ1を通過した排気ガスを
集合させる集合部3が、内側素管5と外側素管6が密着
した二重管として構成されるため剛性が増加し、この集
合部3から発生する放射音を低減させることが可能であ
る。
【0024】
【発明の効果】以上詳細に説明したように本発明に係る
排気集合部の構造では、排気マニホールドに接続された
2本のパイプを所定の角度で屈折させて端部を互いに接
合したので、これらのパイプの間に乱流や渦流を発生さ
せる間隙がない。このため、各パイプを流通した排気ガ
スは集合部に流通すると同時に合流し、乱流や渦流の発
生を可及的に軽減させて騒音の発生を軽減させることが
出来る。
【0025】また集合部を内側素管と外側素管を密着さ
せた二重管構造としたので、該集合部に於ける排気ガス
の干渉により発生する放射音を低減することが出来る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an exhaust collecting portion for collecting exhaust gas discharged through two pipes connected to an exhaust manifold into one pipe. It is about. 2. Description of the Related Art A collecting part for collecting two pipes connected to an exhaust manifold into one pipe is generally configured as shown in FIG. That is, one end is fixed to a flange of an exhaust manifold (not shown).
The pipes 51 are arranged substantially in parallel at predetermined intervals. The other ends of the pipes 51 are independently fitted and welded to a collective pipe 52 formed in a trifurcated shape. A pipe 53 is connected to the downstream end of the collecting pipe 52. Further, as shown in FIG. 5, the collecting pipe 52 is formed by welding a pair of molded bodies 52a and 52b arranged vertically. In particular, the upstream end of the collecting pipe 52 is formed into eyeglasses along the periphery of the pipe 51 in order to maintain airtightness by being connected to two independent pipes 51. In the structure of the exhaust collecting section, the collecting pipe 52
Is complicated and the trajectory of the welding line is complicated, so that there is a problem that there is a limit in reducing the cost. For this reason, the applicant has arranged two pipes 51 side by side, welded the ends of the pipes to the respective sides, formed the end of the base tube into a connection shape of the pipe 51, and formed two pipes in the formed portion.
A technology for constructing the exhaust collecting part by fitting and welding 51 has been developed and a patent application has been filed (Japanese Patent Laid-Open No. 5-1534).
issue). [0004] In each of the above techniques,
Two pipes 51 having one end connected to the exhaust manifold are arranged in parallel with each other, and the other end is connected to the collecting pipe 52 while maintaining a parallel state. Because of this, each pipe
Exhaust gas discharged through the pipe 51 interferes in the collecting pipe 52 to generate a turbulent flow or a vortex, which causes a problem that radiated sound is generated. An object of the present invention is to provide a structure of an exhaust collecting section which can reduce interference between exhaust gas discharged from two pipes in a collecting pipe and thereby reduce radiation noise. It is in. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the exhaust gas collecting part according to the present invention is such that two pipes each having one end connected to an exhaust manifold are bent at a predetermined angle to each other. The upstream exhaust pipe abutted at the other end and the outer pipe fitted to one end of the inner pipe, and the diameter of the taper is increased in a tapered shape over a predetermined length range, so that both pipes are in close contact with each other. The downstream side formed with the close contact portion corresponding to the shape along the periphery of each pipe at the end where the two pipes abut on the upstream side exhaust pipe and the substantially triangular planar shape. An exhaust pipe, and abutting ends of two pipes in the upstream exhaust pipe are fitted and welded to a formed portion of the downstream exhaust pipe. In the structure of the exhaust collecting section, the two pipes constituting the upstream exhaust pipe are bent at a predetermined angle, and as a result, they come into contact with each other so as to cross each other at the ends. In addition, the downstream exhaust pipe is fitted with the outer pipe at the end of the inner pipe, and the double pipe portion is tapered to expand the diameter so that both pipes are in close contact with each other. The upstream exhaust pipe is formed by molding so as to correspond to the shape along the circumference of each pipe at the contact end of the two pipes and the substantially triangular plane shape. For this reason, by fitting and welding the contact ends of the two pipes constituting the upstream exhaust pipe to the molded portion of the downstream exhaust pipe, the exhaust gas discharged from the two pipes is welded. Can collectively form an exhaust collecting portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the above-mentioned exhaust collecting section will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating the configuration of an exhaust gas collecting section, FIG. 2 is a perspective view illustrating a relationship between an upstream exhaust pipe and a downstream exhaust pipe, and FIG. 3 is a view illustrating a manufacturing process of the downstream exhaust pipe. . The structure of the exhaust collecting portion according to the present invention is to collect exhaust gas flowing through two pipes 1 connected to an exhaust manifold (not shown) at one end of the upstream exhaust pipe A smoothly. In addition to reducing the generation of turbulence and vortex of exhaust gas as much as possible,
The exhaust gas collecting portion formed in the downstream side exhaust pipe B is configured so that two pipes are closely attached to each other to reduce radiated sound. As shown in FIGS. 1 and 2, the upstream exhaust pipe A
Is constituted by two pipes 1 arranged in parallel. One end of each pipe 1 is welded to a flange of an exhaust manifold (not shown). The free ends of the two pipes 1 arranged in parallel are bent at a predetermined angle about the point 1a and in a direction in which the ends 1b approach each other.
Are welded to maintain the angle of refraction and constrain the shape. The refraction angle of each of the pipes 1 is set to a value that allows the exhaust gas flowing through the pipes 1 to easily gather and does not generate turbulence or vortex at the junction. The downstream exhaust pipe B is connected to the upstream exhaust pipe A and collects exhaust gas flowing through each pipe 1 and discharges the exhaust gas to a muffler or a converter (not shown). The downstream side exhaust pipe B includes a fitting portion 2 formed at an end portion, a collecting portion 3 formed continuously with the fitting portion 2, and a collecting portion 3.
The discharge portion 4 is formed continuously with the discharge portion 4. The fitting portion 2 fits the ends 1b of the two pipes 1 constituting the upstream exhaust pipe A, and extends along the periphery of the mutually welded ends 1b of the two pipes 1. It has a different shape. The collecting section 3 has a function of smoothly collecting the exhaust gas discharged from the two pipes 1 and discharging the exhaust gas to the discharging section 4. For this reason, the collecting part 3 has a wall surface along the pipe wall of each pipe 1 and has a substantially triangular planar shape. That is, the widthwise side wall of the collecting part 3 (the side wall in the left-right direction in FIG. 1) has an angle substantially equal to the angle of refraction of each pipe 1, and the side walls in the vertical direction are formed substantially parallel. The discharge section 4 is formed continuously with the collecting section 3 and discharges the exhaust gas collected by the collecting section 3 to a muffler or a converter. The downstream exhaust pipe B comprises an inner pipe 5 and an outer pipe 6, and the fitting portion 2 and the collecting section 3 are formed as a double pipe structure in which the inner pipe 5 and the outer pipe 6 are brought into close contact. The discharge part 4 is formed as a single-pipe structure with an inner shell 5. Next, a procedure for manufacturing the downstream exhaust pipe B will be described with reference to FIG. As shown in FIG. 1A, an inner shell 5 and an outer shell 6 having a diameter and a length set in advance according to the size of the target downstream exhaust pipe B are prepared. Insert one end of the inner shell 5 and insert the two shells 5,
6. Match the pipe ends. Next, as shown in FIG. 1B, the double pipe portion formed by the inner pipe 5 and the outer pipe 6 is so-called expanded so as to expand in a tapered shape over a predetermined length range. 5 and the outer shell 6 are brought into close contact with each other. The single tube portion that is continuous from the portion of the inner tube 5 that is in close contact with the outer tube 6 is so-called contracted to reduce the diameter, and the discharge portion 4 is formed by the contracted tube. Further, as shown in FIG. 2C, the contacted double pipe portion in which the inner raw pipe 5 and the outer raw pipe 6 are brought into close contact with each other is press-formed to form two upstream exhaust pipes A. The fitting portion 2 and the gathering portion 3 are formed by molding into a shape along the end 1b to which the pipe 1 is connected. Downstream exhaust pipe B manufactured as described above
By fitting the end 1b of the pipe 1 of the upstream side exhaust pipe A to the fitting part 2 of the upstream side, and then welding the joint portion of both the exhaust pipes A and B, it is possible to form an exhaust collecting part. is there. In the structure of the exhaust collecting section, the exhaust gas flowing through the two pipes 1 constituting the upstream exhaust pipe A passes through a point 1a set on the pipes 1, and then the refraction angle of the pipes 1 And the downstream exhaust pipe B from the end 1b.
And circulates through the collecting part 3 of. At this time, since the end portions 1b of the pipe 1 are in contact with each other on the side surfaces, it is possible to reduce turbulence and vortex generated in the exhaust gas flowing through the collecting portion 3 as much as possible, thereby reducing noise. It is possible to reduce it. Also, since the collecting part 3 for collecting the exhaust gas passing through the two pipes 1 is formed as a double pipe in which the inner raw pipe 5 and the outer raw pipe 6 are in close contact with each other, the rigidity is increased. 3, it is possible to reduce the radiated sound generated. As described in detail above, in the structure of the exhaust collecting portion according to the present invention, two pipes connected to the exhaust manifold are bent at a predetermined angle and their ends are joined to each other. Therefore, there is no gap between these pipes to generate turbulence and vortex. For this reason, the exhaust gas flowing through each pipe flows into the collecting portion and joins at the same time, so that the generation of turbulence and eddy current can be reduced as much as possible, and the generation of noise can be reduced. Further, since the collecting portion has a double tube structure in which the inner shell and the outer shell are in close contact with each other, it is possible to reduce radiated sound generated due to interference of exhaust gas in the collecting portion.
【図面の簡単な説明】
【図1】排気集合部の構成を説明する断面図である。
【図2】上流側排気管と下流側排気管の関係を説明する
斜視図である。
【図3】下流側排気管の製作工程を説明する図である。
【図4】従来の排気集合部の構造を説明する平断面図で
ある。
【図5】従来の排気集合部の構造を説明する外観斜視図
である。
【符号の説明】
A 上流側排気管
B 下流側排気管
1 パイプ
1a 点
1b 端部
2 嵌合部
3 集合部
4 排出部
5 内側素管
6 外側素管BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view illustrating a configuration of an exhaust collecting part. FIG. 2 is a perspective view illustrating a relationship between an upstream exhaust pipe and a downstream exhaust pipe. FIG. 3 is a diagram illustrating a manufacturing process of a downstream exhaust pipe. FIG. 4 is a cross-sectional plan view illustrating a structure of a conventional exhaust collecting portion. FIG. 5 is an external perspective view for explaining the structure of a conventional exhaust collecting portion. [Description of Signs] A Upstream exhaust pipe B Downstream exhaust pipe 1 Pipe 1a Point 1b End 2 Fitting section 3 Collecting section 4 Discharge section 5 Inner shell 6 Outer shell
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−290618(JP,A) 特開 昭52−142138(JP,A) 実開 平2−141623(JP,U) 実開 昭55−83212(JP,U) (58)調査した分野(Int.Cl.7,DB名) F01N 7/10 F01N 7/08 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-290618 (JP, A) JP-A-52-142138 (JP, A) JP-A 2-141623 (JP, U) JP-A 55-142 83212 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F01N 7/10 F01N 7/08
Claims (1)
本のパイプを所定角度で屈折させて互いに他端部で当接
させた上流側排気管と、内側素管の一方の端部に外側素
管を嵌装すると共に所定の長さ範囲にわたってテーパ状
に径を拡大して両素管を密着させ且つ該密着部を前記上
流側排気管に於ける2本のパイプを当接させた端部に於
ける各パイプの周囲に沿った形状と略三角形の平面形状
に対応させて成形した下流側排気管とを有し、下流側排
気管の成形部に上流側排気管に於ける2本のパイプの当
接端部を嵌合して溶接したことを特徴とする排気集合部
の構造。(57) [Claims 1] One end of which is connected to the exhaust manifold
An upstream exhaust pipe that is bent at a predetermined angle and abuts at the other end thereof, and an outer raw pipe is fitted to one end of the inner raw pipe and is tapered over a predetermined length range. The diameter of the pipes is increased so that the two pipes are in close contact with each other, and the close contact portion is formed along the periphery of each of the pipes at the end where the two pipes in the upstream exhaust pipe are in contact with each other. A downstream exhaust pipe formed in accordance with the planar shape of the above, and the fitting ends of the two pipes in the upstream exhaust pipe are fitted and welded to the formed portion of the downstream exhaust pipe. The structure of the exhaust collecting section characterized by the following.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30099295A JP3457782B2 (en) | 1995-11-20 | 1995-11-20 | Exhaust assembly structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30099295A JP3457782B2 (en) | 1995-11-20 | 1995-11-20 | Exhaust assembly structure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09144535A JPH09144535A (en) | 1997-06-03 |
JP3457782B2 true JP3457782B2 (en) | 2003-10-20 |
Family
ID=17891531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30099295A Expired - Fee Related JP3457782B2 (en) | 1995-11-20 | 1995-11-20 | Exhaust assembly structure |
Country Status (1)
Country | Link |
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JP (1) | JP3457782B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006105044A (en) * | 2004-10-06 | 2006-04-20 | Honda Motor Co Ltd | Exhaust manifold |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20040000081A (en) * | 2002-06-24 | 2004-01-03 | 현대자동차주식회사 | Structure of exhaust manifold |
JP5817302B2 (en) * | 2011-08-03 | 2015-11-18 | マツダ株式会社 | Intake and exhaust system for multi-cylinder engine |
JP5978584B2 (en) * | 2011-10-04 | 2016-08-24 | マツダ株式会社 | Exhaust system for multi-cylinder engine |
CN103993946B (en) * | 2014-05-05 | 2016-06-01 | 江门气派摩托车有限公司 | A kind of double tracheae collection of motorcycle connects silicone tube structure |
JP6378611B2 (en) | 2014-10-29 | 2018-08-22 | 川崎重工業株式会社 | Engine exhaust system |
-
1995
- 1995-11-20 JP JP30099295A patent/JP3457782B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006105044A (en) * | 2004-10-06 | 2006-04-20 | Honda Motor Co Ltd | Exhaust manifold |
Also Published As
Publication number | Publication date |
---|---|
JPH09144535A (en) | 1997-06-03 |
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