JP2563904B2 - Engine exhaust system - Google Patents

Engine exhaust system

Info

Publication number
JP2563904B2
JP2563904B2 JP61135182A JP13518286A JP2563904B2 JP 2563904 B2 JP2563904 B2 JP 2563904B2 JP 61135182 A JP61135182 A JP 61135182A JP 13518286 A JP13518286 A JP 13518286A JP 2563904 B2 JP2563904 B2 JP 2563904B2
Authority
JP
Japan
Prior art keywords
pipe
divided
divided inner
insertion tip
tube
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
Application number
JP61135182A
Other languages
Japanese (ja)
Other versions
JPS62291416A (en
Inventor
道雄 林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP61135182A priority Critical patent/JP2563904B2/en
Publication of JPS62291416A publication Critical patent/JPS62291416A/en
Application granted granted Critical
Publication of JP2563904B2 publication Critical patent/JP2563904B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/08Other arrangements or adaptations of exhaust conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/14Exhaust 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 having thermal insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/14Exhaust 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 having thermal insulation
    • F01N13/141Double-walled exhaust pipes or housings

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、たとえば自動二輪車用エンジンの排気装置
に関する。
TECHNICAL FIELD The present invention relates to, for example, an exhaust system for an engine for a motorcycle.

〔従来技術〕[Prior art]

エンジンと消音器とを結ぶ排気管において、従来、消
音器に連なる下流端部を外管と内管とからなる二重管構
造とし、これら外管と内管との間にグラスウール等の吸
音材を充填したものが知られている。
In the exhaust pipe connecting the engine and the silencer, conventionally, the downstream end connected to the silencer has a double pipe structure consisting of an outer pipe and an inner pipe, and a sound absorbing material such as glass wool is provided between the outer pipe and the inner pipe. Filled with is known.

ところで、排気管の下流端部は、リヤアームと緩衝器
とを結ぶリンクや後輪等を避けるため、往々にして途中
で屈曲されている場合が多い。このように排気管(外
管)が曲がっていると、内管の挿入が困難となるため、
従来では内管を、屈曲部を境にして上流側と下流側とに
二分割し、これら分割内管を外管の両端開口部からそれ
ぞれ挿入することが行なわれている。
By the way, the downstream end of the exhaust pipe is often bent in the middle in order to avoid a link connecting the rear arm and the shock absorber, a rear wheel, or the like. If the exhaust pipe (outer pipe) is bent like this, it becomes difficult to insert the inner pipe,
Conventionally, it has been practiced to divide the inner pipe into two parts, an upstream side and a downstream side with a bent portion as a boundary, and insert these divided inner pipes from both end openings of the outer pipe.

〔発明が解決しようとする問題点〕[Problems to be solved by the invention]

しかしながら、この構成では分割内管の挿入先端部間
に隙間が生じてしまい、この隙間から漏れた排気が外管
に直接当るので、外管が局部的に加熱されて変色する不
具合があった。
However, in this structure, a gap is formed between the insertion tip portions of the split inner pipe, and the exhaust gas leaking from the gap directly hits the outer pipe, so that the outer pipe is locally heated, causing a problem of discoloration.

また、上記隙間の存在によって排気の流れが乱され、
気流音が発生したり、エンジン出力が低下する等の問題
もある。
In addition, the existence of the gap disturbs the flow of exhaust gas,
There are also problems such as generation of airflow noise and reduction of engine output.

本発明は、このような事情にもとづいてなされたもの
で、第1の分割内管と第2の分割内管との位置合わせを
精度良く容易に行なえるとともに、これら分割内管の接
続部分に吸音材が入り込むのを防止でき、分割内管を互
いに隙間なく確実に接続できるエンジンの排気装置の提
供を目的とする。
The present invention has been made under such circumstances, and the first divided inner pipe and the second divided inner pipe can be accurately and easily aligned with each other, and the connecting portions of these divided inner pipes can be easily adjusted. An object of the present invention is to provide an exhaust system for an engine, which can prevent the sound absorbing material from entering and can reliably connect the divided inner pipes to each other without a gap.

〔問題点を解決するための手段〕[Means for solving problems]

上記目的を達成するため、本発明は、排気管の外郭を
構成するとともに、両端が開口された外管と、この外管
の内側に挿通された内管と、これら内管の外周面に装着
され、上記外管との間に充填された吸音材とを有し、上
記外管を軸方向の途中で屈曲させたエンジン排気装置を
前提としている。
In order to achieve the above-mentioned object, the present invention constitutes an outer shell of an exhaust pipe, and an outer pipe having both ends opened, an inner pipe inserted inside the outer pipe, and an outer peripheral surface of the inner pipe. It is assumed that the engine exhaust system has a sound absorbing material filled between the outer pipe and the outer pipe, and the outer pipe is bent midway in the axial direction.

そして、上記内管は、上記外管の屈曲部を境として、
この屈曲部の上流側に位置される第1の分割内管と、上
記屈曲部の下流側に位置される第2の分割内管とに分割
し、これら第1の分割内管および第2の分割内管は、上
記外管の両端開口部から夫々上記屈曲部に向けて挿入さ
れるとともに、これら第1および第2の分割内管のう
ち、一方の分割内管の挿入先端部に、径方向外側に向け
て拡開されて、上記他方の分割内管の挿入先端部に被さ
る重合部を形成し、かつ、上記第1および第2の分割内
管の挿入先端部と上記外管との間には、これら第1およ
び第2の分割内管を上記外管に対し同軸状に保持すると
ともに、上記吸音材を上記屈曲部から隔てるリング状の
支持具を配置したことを特徴としている。
And, the inner tube, with the bent portion of the outer tube as a boundary,
The first divided inner pipe located upstream of the bent portion and the second divided inner pipe located downstream of the bent portion are divided into the first divided inner pipe and the second divided inner pipe. The split inner pipe is inserted from both end openings of the outer pipe toward the bent portions, respectively, and a diameter of the split inner pipe is inserted into the insertion tip of one of the first and second split inner pipes. Is expanded toward the outer side in the direction to form a superposed portion that covers the insertion tip of the other split inner tube, and the insertion tip of the first and second split inner tubes and the outer tube In between, the first and second divided inner pipes are coaxially held with respect to the outer pipe, and a ring-shaped support tool that separates the sound absorbing material from the bent portion is arranged.

〔作用〕[Action]

この構成によれば、一方の分割内管の重合部が、他方
の分割内管の挿入先端部を径方向外側から覆うように、
この分割内管の挿入先端部に突き合わされる。しかも、
第1および第2の分割内管は、夫々支持具を介して外管
に対する同軸度が保持されているので、これら分割内管
を外管の両端開口部から屈曲部に向けて挿入した時に、
分割内管の挿入先端部は、外管の径方向にずれることな
く精度良く位置合わせされる。
According to this configuration, the overlapping portion of one of the divided inner tubes covers the insertion tip of the other divided inner tube from the radial outside,
It is butted against the insertion tip of this split inner tube. Moreover,
Since the first and second divided inner pipes are held coaxial with the outer pipe through the supporting members, respectively, when these divided inner pipes are inserted from both end openings of the outer pipe toward the bent portion,
The insertion tip of the split inner tube is accurately aligned without being displaced in the radial direction of the outer tube.

そのため、第1および第2の分割内管の挿入先端部間
に隙間が生じることはなく、外管内での排気の漏れを防
止できる。したがって、外管が高温の排気に直接さらさ
れずに済むとともに、内管の内側での排気の流れを円滑
に保つことができる。
Therefore, no gap is created between the insertion tip portions of the first and second divided inner tubes, and the leakage of exhaust gas in the outer tube can be prevented. Therefore, the outer pipe is not directly exposed to the high temperature exhaust gas, and the flow of the exhaust gas inside the inner pipe can be kept smooth.

また、外管と内管との間に充填された吸音材は、支持
具によって屈曲部から隔離されているので、第1および
第2の分割内管を外管に挿入する際に、吸音材が屈曲部
に向けてはみ出し難くなる。そのため、吸音材が分割内
管の挿入先端部の突き合わせ部分に入り込むのを防止で
き、これら分割内管の接続作業性が損なわれずに済む。
Further, since the sound absorbing material filled between the outer pipe and the inner pipe is isolated from the bent portion by the support, the sound absorbing material is inserted when the first and second divided inner pipes are inserted into the outer pipe. Is hard to stick out toward the bent part. Therefore, it is possible to prevent the sound absorbing material from entering the abutting portion of the insertion tip of the divided inner pipe, and the workability of connecting these divided inner pipes is not impaired.

〔発明の実施例〕Example of Invention

以下本発明を、図面に示す一実施例にもとづいて説明
する。
The present invention will be described below based on an embodiment shown in the drawings.

第4図は自動二輪車の全体を示す側面図であり、符号
1で示すフレームには例えば4サイクル4気筒エンジン
2が搭載されている。エンジン2の各気筒3a〜3dには、
排気導出管4a〜4dが接続され、これら排気導出管4a〜4d
の下流端はクランクケース5の直下で排気集合体6を介
して一本に集合されている。排気集合体6の下流端部か
ら延びる排気管7は、リヤアーム20と緩衝器21とを結ぶ
リンク8および後輪9を避けて一側方に屈曲されてお
り、この屈曲部11は排気管7の略中央に位置している。
FIG. 4 is a side view showing the entire motorcycle, and a frame indicated by reference numeral 1 is equipped with, for example, a 4-cycle 4-cylinder engine 2. In each cylinder 3a-3d of engine 2,
Exhaust outlet pipes 4a to 4d are connected, and these exhaust outlet pipes 4a to 4d are connected.
The downstream end of the exhaust gas is directly under the crankcase 5 and is assembled into one via an exhaust assembly 6. The exhaust pipe 7 extending from the downstream end of the exhaust assembly 6 is bent to one side while avoiding the link 8 connecting the rear arm 20 and the shock absorber 21 and the rear wheel 9, and this bent portion 11 is bent. It is located approximately in the center.

なお、排気管7の下流端には単一の消音器10が接続さ
れている。
A single silencer 10 is connected to the downstream end of the exhaust pipe 7.

上記排気管7は、第1図に示したように、排気管7の
外郭となる外管12と、この外管12の内側に挿入された内
管13とによって二重管構造をなしている。そして、内管
13は外管12の屈曲部11を境として、この屈曲部11の上流
側に位置される第1の分割内管13aと、屈曲部11の下流
側に位置される第2の分割内管13bとに二分割されてい
る。これら第1および第2の分割内管13a,13bは、夫々
多数の通孔18を有するパンチングメタルにて直管状に構
成されている。このような分割内管13a,13bは外管12の
両端開口部から屈曲部11に向かって挿入されており、そ
の挿入先端部が屈曲部11の内側に位置されている。ま
た、分割内管13a,13bの外周面には、例えばグラスウー
ル等の吸音材16が装着されており、この吸音材16は、外
管12と分割内管13a,13bとの間に充填される。
As shown in FIG. 1, the exhaust pipe 7 has a double pipe structure including an outer pipe 12 which is an outer shell of the exhaust pipe 7 and an inner pipe 13 inserted inside the outer pipe 12. . And the inner pipe
A first divided inner pipe 13a located upstream of the bent portion 11 of the outer pipe 12 and a second divided inner pipe 13b located downstream of the bent portion 11 are separated from each other by the bent portion 11 of the outer pipe 12. It is divided into two parts. Each of the first and second divided inner tubes 13a and 13b is made of punching metal having a large number of through holes 18 and is formed in a straight tube shape. Such divided inner tubes 13a and 13b are inserted from the openings at both ends of the outer tube 12 toward the bent portion 11, and the insertion tips are located inside the bent portion 11. Further, a sound absorbing material 16 such as glass wool is mounted on the outer peripheral surfaces of the divided inner tubes 13a, 13b, and the sound absorbing material 16 is filled between the outer tube 12 and the divided inner tubes 13a, 13b. .

そして、第1図に示すように、屈曲部11の上流側に位
置する第1の分割内管13aの挿入先端部には、径方向外
側に向けて拡開されたラッパ状の重合部17が形成されて
いる。重合部17は、第2の分割内管13bの挿入先端部を
外側から覆うように、この挿入先端部に被さっている。
そのため、第1および第2の分割内管13a,13bは、外管1
2の内側において軸方向に沿って一体的に連続されてい
る。
Then, as shown in FIG. 1, a trumpet-shaped overlapping portion 17 expanded radially outward is provided at the insertion tip portion of the first divided inner pipe 13a located on the upstream side of the bent portion 11. Has been formed. The overlapping section 17 covers the insertion tip of the second split inner tube 13b so as to cover the insertion tip from the outside.
Therefore, the first and second divided inner tubes 13a and 13b are the outer tubes 1
The inside of 2 is integrally continuous along the axial direction.

また、第1および第2の分割内管13a,13bの挿入先端
部は、夫々リング状の支持具19を介して外管12に同軸状
に保持されている。支持具17は、第1図に示すように、
屈曲部11を挟んだ両側に位置されており、上記分割内管
13a,13bの外周面の吸音材16を屈曲部11から隔離してい
る。
The insertion tip portions of the first and second divided inner tubes 13a and 13b are coaxially held by the outer tube 12 via ring-shaped supporting members 19, respectively. The support 17 is, as shown in FIG.
It is located on both sides of the bent part 11 and has the above-mentioned split inner pipe.
The sound absorbing material 16 on the outer peripheral surfaces of 13a and 13b is separated from the bent portion 11.

このような構成によれば、第1の分割内管13aの挿入
先端部に、第2の分割内管13bの挿入先端部に被さる重
合部17を設けたので、第1および第2の分割内管13a,13
bを外管12の両端開口部から挿入した際には、上記重合
部17が第2の分割内管13bの挿入先端部を径方向外側か
ら覆うように、この挿入先端部に突き合わされる。
According to this structure, the insertion tip of the first divided inner tube 13a is provided with the overlapping portion 17 that covers the insertion tip of the second divided inner tube 13b. Tube 13a, 13
When b is inserted from both end openings of the outer tube 12, the overlapping portion 17 is butted against the insertion tip so as to cover the insertion tip of the second divided inner tube 13b from the outside in the radial direction.

しかも、第1および第2の分割内管13a,13bの挿入先
端部は、夫々支持具19を介して外管12に同軸状に保持さ
れているので、これら第1および第2の分割内管13a,13
bの挿入先端部は、互いに径方向にずれることなく精度
良く位置合わせされる。そのため、内管13を軸方向に二
分割したにも拘らず、第1および第2の分割内管13a,13
bの挿入先端部を隙間なく接続することができる。
Moreover, since the insertion tip portions of the first and second divided inner pipes 13a and 13b are coaxially held by the outer pipe 12 via the support members 19, respectively, the first and second divided inner pipes 13a and 13b are retained. 13a, 13
The insertion tips of b are accurately aligned without being displaced from each other in the radial direction. Therefore, although the inner pipe 13 is divided into two in the axial direction, the first and second divided inner pipes 13a, 13
The insertion tip of b can be connected without a gap.

したがって、外管12に直接排気が当ることがなくな
り、変色を生じない。しかも、排気は連続する分割内管
13a,13b内を円滑に流れるので、気流音の発生を防止で
きるのは勿論、排気の流動抵抗も少なく、エンジン出力
が低下する虞れがない。
Therefore, the outer tube 12 is not directly exposed to exhaust gas, and discoloration does not occur. Moreover, the exhaust is a continuous inner pipe
Since it smoothly flows through the insides of 13a and 13b, it is possible to prevent the generation of airflow noise, and also the flow resistance of exhaust gas is small and there is no fear that the engine output will decrease.

また、本実施例では、屈曲部11を排気管7の略中央部
に設定したので、分割内管13a,13bを共通化することが
でき、部品種類が少なくなってコストの低減に寄与す
る。
Further, in the present embodiment, since the bent portion 11 is set at the substantially central portion of the exhaust pipe 7, the divided inner pipes 13a and 13b can be shared, and the number of types of parts is reduced, which contributes to cost reduction.

さらに、上記構成によると、第1および第2の分割内
管13a,13bの外周面に装着された吸音材16は、これら分
割内管13a,13bを外管12に挿入した状態において、夫々
支持具19によって上記屈曲部11から隔離されている。そ
のため、第1および第2の分割内管13a,13bを外管12に
挿入する際に、吸音材16が屈曲部11に向けてはみ出し難
くなり、吸音材16が第1および第2の分割内管13a,13b
の挿入先端部の突き合わせ部分に入り込むのを防止でき
る。よって、上記分割内管13a,13bの接続作業性が損な
われずに済み、第1および第2の分割内管13a,13bを互
いに精度良く接続することができる。
Further, according to the above configuration, the sound absorbing material 16 mounted on the outer peripheral surfaces of the first and second divided inner pipes 13a and 13b respectively supports the divided inner pipes 13a and 13b in the state of being inserted into the outer pipe 12. It is separated from the bent portion 11 by a tool 19. Therefore, when the first and second divided inner pipes 13a and 13b are inserted into the outer pipe 12, the sound absorbing material 16 is less likely to protrude toward the bent portion 11, and the sound absorbing material 16 is separated into the first and second divided pipes. Tube 13a, 13b
Can be prevented from entering the abutting portion of the insertion tip of the. Therefore, the workability of connecting the divided inner pipes 13a and 13b is not impaired, and the first and second divided inner pipes 13a and 13b can be accurately connected to each other.

なお、本発明に係るエンジンは、4気筒に制約され
ず、例えば3気筒または6気筒あるいは単気筒でも実施
可能である。
The engine according to the present invention is not limited to four cylinders, and can be implemented with, for example, three cylinders, six cylinders, or a single cylinder.

〔発明の効果〕〔The invention's effect〕

以上詳述した本発明によれば、第1および第2の分割
内管の挿入先端部を隙間なく精度良く接続することがで
き、外管内での排気の漏れを防止できる。したがって、
外管が高温の排気に直接さらされずに済み、外管の変色
を防止できるとともに、内管内管での排気の流れが円滑
となって、エンジン出力に悪影響を及ぼすこともなく、
かつまた排気管内での気流音の発生を軽減できる。
According to the present invention described in detail above, the insertion tip portions of the first and second divided inner pipes can be accurately connected without a gap, and the leakage of exhaust gas in the outer pipe can be prevented. Therefore,
The outer pipe is not directly exposed to high-temperature exhaust, discoloration of the outer pipe can be prevented, the flow of exhaust in the inner pipe becomes smooth, and the engine output is not adversely affected.
Moreover, the generation of air flow noise in the exhaust pipe can be reduced.

さらに、第1および第2の分割内管を外管に挿入する
際に、吸音材が屈曲部に向けてはみ出し難くなり、吸音
材が分割内管の挿入先端部の突き合わせ部分に入り込む
のを防止できる。よって、第1および第2の分割内管の
接続作業性が損なわれずに済み、これら分割内管の接続
を確実に行なえるといった利点がある。
Furthermore, when the first and second split inner tubes are inserted into the outer tube, it is difficult for the sound absorbing material to protrude toward the bent portion, and the sound absorbing material is prevented from entering the abutting portion of the insertion tip of the split inner tube. it can. Therefore, there is an advantage that the workability of connecting the first and second divided inner pipes is not impaired, and the divided inner pipes can be surely connected.

【図面の簡単な説明】[Brief description of drawings]

図面は本発明の一実施例を示し、第1図は排気管の断面
図、第2図は排気装置の平面図、第3図は同じく側面
図、第4図は自動二輪車の側面図である。 7……排気管、11……屈曲部、12……外管、13……内
管、13a,13b……第1の分割内管、第2の分割内管、16
……吸音材、17……重合部、19……支持具。
The drawings show one embodiment of the present invention. Fig. 1 is a sectional view of an exhaust pipe, Fig. 2 is a plan view of an exhaust system, Fig. 3 is a side view of the same, and Fig. 4 is a side view of a motorcycle. . 7 ... Exhaust pipe, 11 ... Bent portion, 12 ... Outer pipe, 13 ... Inner pipe, 13a, 13b ... First split inner pipe, Second split inner pipe, 16
...... Sound absorbing material, 17 …… Overlapping section, 19 …… Supporting equipment.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】排気管の外郭を構成するとともに、両端が
開口された外管と、 この外管の内側に挿通された内管と、 この内管の外周面に装着され、上記外管との間に充填さ
れた吸音材と、を有し、 上記外管を軸方向の途中で屈曲させたエンジンの排気装
置において、 上記内管は、上記外管の屈曲部を境として、この屈曲部
の上流側に位置される第1の分割内管と、上記屈曲部の
下流側に位置される第2の分割内管とに分割し、 これら第1の分割内管および第2の分割内管は、上記外
管の両端開口部から夫々上記屈曲部に向けて挿入される
とともに、 これら第1および第2の分割内管のうち、一方の分割内
管の挿入先端部に、径方向外側に向けて拡開されて、上
記他方の分割内管の挿入先端部に被さる重合部を形成
し、 かつ、上記第1および第2の分割内管の挿入先端部と上
記外管との間には、これら第1および第2の分割内管を
上記外管に対し同軸状に保持するとともに、上記吸音材
を上記屈曲部から隔てるリング状の支持具を配置したこ
とを特徴とするエンジンの排気装置。
1. An outer pipe which constitutes an outer shell of an exhaust pipe and has both ends opened, an inner pipe inserted inside the outer pipe, and an outer pipe attached to an outer peripheral surface of the inner pipe. And a sound-absorbing material filled between the outer pipe and the outer pipe, which is bent in the middle of the axial direction. Divided into a first divided inner pipe located upstream of the bent portion and a second divided inner pipe located downstream of the bent portion, and these first divided inner pipe and second divided inner pipe Is inserted from both end openings of the outer pipe toward the bent portions, respectively, and at the insertion tip end of one of the first and second divided inner pipes, the radially outer side is formed. Is expanded toward the other inner divided pipe to form an overlapping portion that covers the insertion tip of the other divided inner tube, and Between the insertion tip of the second split inner tube and the outer tube, the first and second split inner tubes are held coaxially with the outer tube, and the sound absorbing material is provided at the bent portion. An exhaust system for an engine, characterized in that a ring-shaped support tool is arranged so as to be separated from the engine.
JP61135182A 1986-06-11 1986-06-11 Engine exhaust system Expired - Fee Related JP2563904B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61135182A JP2563904B2 (en) 1986-06-11 1986-06-11 Engine exhaust system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61135182A JP2563904B2 (en) 1986-06-11 1986-06-11 Engine exhaust system

Publications (2)

Publication Number Publication Date
JPS62291416A JPS62291416A (en) 1987-12-18
JP2563904B2 true JP2563904B2 (en) 1996-12-18

Family

ID=15145752

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61135182A Expired - Fee Related JP2563904B2 (en) 1986-06-11 1986-06-11 Engine exhaust system

Country Status (1)

Country Link
JP (1) JP2563904B2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60150417A (en) * 1984-01-17 1985-08-08 Yamaha Motor Co Ltd Exhaust pipe of engine in motorcycle, etc.

Also Published As

Publication number Publication date
JPS62291416A (en) 1987-12-18

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