JPS62121818A - Exhaust muffler for internal combustion engine - Google Patents
Exhaust muffler for internal combustion engineInfo
- Publication number
- JPS62121818A JPS62121818A JP25862985A JP25862985A JPS62121818A JP S62121818 A JPS62121818 A JP S62121818A JP 25862985 A JP25862985 A JP 25862985A JP 25862985 A JP25862985 A JP 25862985A JP S62121818 A JPS62121818 A JP S62121818A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- sectional area
- resonance chamber
- internal combustion
- throat
- 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.)
- Pending
Links
Classifications
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
-
- 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
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/15—Plurality of resonance or dead chambers
- F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自動二輪車等を駆動する内燃機関の排気消音装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust silencing device for an internal combustion engine that drives a motorcycle or the like.
この種の内燃機関の排気消音装置として、排気騒音を共
鳴させることによって減衰させる共鳴室を備えたものが
ある。Some exhaust silencing devices for internal combustion engines of this type include a resonance chamber that attenuates exhaust noise by causing it to resonate.
〔発明が解決しようとする問題点〕 ・ところで
、近年、自動二輪車等の内燃機関に対する騒音低減の要
請が厳しくなっており、排気消音装置の消音性能を高め
ることが要請されている。[Problems to be Solved by the Invention] In recent years, demands for noise reduction in internal combustion engines such as motorcycles have become stricter, and there is a need to improve the noise reduction performance of exhaust silencing devices.
これに応えるために内部構造を複雑にすることが考えら
れるが、このようにすると通気抵抗が大きくなるために
内燃機関の出力が低下する不具合が生じる。In order to meet this demand, it is conceivable to make the internal structure more complex, but if this is done, the ventilation resistance will increase, resulting in a problem that the output of the internal combustion engine will decrease.
そこで、本出願人は排気消音装置の消音性能について検
討ならびにその結果に基づき実験を行った。その結果、
共鳴によって騒音を減衰させる場合、排気通路の断面積
が小さい方が共鳴による減衰効果が大きい点G、こ着目
した。Therefore, the applicant investigated the silencing performance of the exhaust silencing device and conducted experiments based on the results. the result,
When damping noise by resonance, we focused on the point G that the smaller the cross-sectional area of the exhaust passage, the greater the damping effect by resonance.
本発明はこのような事情に鑑みなされたもので、消音性
能が高められ、しかも、内燃機関の出力低下が抑えられ
る内燃機関の排気消音装置を提供するものである。本発
明に係る排気消音装置は、排気通路の一部を、断面積が
排気の流れる方向に向かって漸次小さくなり、のど部の
下流において漸次大きくなる管体で形成し、この管体の
のど部に共鳴室内と排気通路内とを連通ずる開口を設け
たものである。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an exhaust muffling device for an internal combustion engine that has improved muffling performance and can suppress a decrease in the output of the internal combustion engine. In the exhaust silencer according to the present invention, a part of the exhaust passage is formed by a pipe body whose cross-sectional area gradually becomes smaller in the direction in which the exhaust gas flows and gradually becomes larger downstream of the throat part, and the throat part of the pipe body An opening is provided to communicate the inside of the resonance chamber and the inside of the exhaust passage.
本発明においては、共鳴による減衰効果を高めると共に
、通気抵抗が大きくなるのを抑えるようにする。In the present invention, the damping effect due to resonance is enhanced, and an increase in ventilation resistance is suppressed.
〔実施例]
以下、本発明の一実施例を図により詳細に説明する。図
は本発明に係る内燃機関の排気消音装置を示す一部断面
図で、同図において符号1で示すものは自動二輪車用の
排気消音装置を示し、この排気消音装置1は一端が図示
しないエンジンの排気口に接続された排気管2と、この
排気管2の他端に接続された排気消音器3となどから構
成されている。排気管2はエンジンの前側を下降して車
体後方に向かって水平方向に延在した後に上方に向かう
ように形成されている。排気消音器3は箱形状に形成さ
れており、内部は隔壁4.5によって三つの部屋に画成
されている。すなわち、6は隔壁4.5間に形成された
共鳴室、7はこの共鳴室6の後側に形成された第1膨張
室、8は共鳴室6の前側に形成された第2膨張室である
。前記排気管2は排気消音器3の前部下側から挿入され
、隔壁4および隔壁5の下部を貫通して第1膨張室7内
に開口されている。このため、排気管2は比較的長く形
成されている。[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. The figure is a partial sectional view showing an exhaust silencer for an internal combustion engine according to the present invention. In the figure, the reference numeral 1 indicates an exhaust silencer for a motorcycle. The exhaust pipe 2 is connected to an exhaust port of the exhaust pipe 2, and an exhaust muffler 3 is connected to the other end of the exhaust pipe 2. The exhaust pipe 2 is formed so as to descend from the front side of the engine, extend horizontally toward the rear of the vehicle body, and then move upward. The exhaust muffler 3 is formed into a box shape, and the interior thereof is divided into three rooms by partition walls 4.5. That is, 6 is a resonance chamber formed between the partition walls 4.5, 7 is a first expansion chamber formed on the rear side of the resonance chamber 6, and 8 is a second expansion chamber formed on the front side of the resonance chamber 6. be. The exhaust pipe 2 is inserted from the front lower side of the exhaust muffler 3, passes through the lower part of the partition wall 4 and the partition wall 5, and opens into the first expansion chamber 7. For this reason, the exhaust pipe 2 is formed relatively long.
10は第1膨張室7から共鳴室6を貫通して第2膨張室
8に至る排気通路を形成する管体である。Reference numeral 10 denotes a tube that forms an exhaust passage from the first expansion chamber 7 through the resonance chamber 6 to the second expansion chamber 8.
この管体10は、排気消音器3内の上部に配され、両端
部を隔壁4および隔壁5によって支持されている。11
は第2膨張室8内に流入した排気を外部に排出するテー
ルパイプで、隔壁4,5の中央部を貫通した後に下方に
向かい、排気消音器3の後部下側から外方に延出してい
る。This tube body 10 is disposed in the upper part of the exhaust muffler 3, and both ends are supported by the partition walls 4 and 5. 11
is a tail pipe for discharging the exhaust gas that has flowed into the second expansion chamber 8 to the outside, and after passing through the center of the partition walls 4 and 5, it heads downward and extends outward from the rear lower side of the exhaust silencer 3. There is.
前記管体10は、上流側は図中矢印で示す排気の流れる
方向に向かって断面積が漸次小さくなりのど部10aに
おいて最小となるように形成されている。また、のど部
10aの下流側は排気の流れる方向に向かって断面積が
漸次大きくなるように形成されている。換言すれば、管
体10はベンチュリ計、あるいは末広ノズルような形状
に形成されている。実施例では、のど部10aの上流側
の断面積変化率の方が、下流側よりも大きく設定されて
いる。そのため、のど部10aは管体10の中央部より
もやや上流側に設けられ、共鳴室6の隔壁5側に位置し
ている。The tube body 10 is formed so that the cross-sectional area on the upstream side gradually decreases in the direction in which the exhaust gas flows, as indicated by the arrow in the figure, and reaches its minimum at the throat portion 10a. Further, the downstream side of the throat portion 10a is formed so that the cross-sectional area gradually increases in the direction in which the exhaust gas flows. In other words, the tubular body 10 is shaped like a venturi meter or a diverging nozzle. In the embodiment, the cross-sectional area change rate on the upstream side of the throat portion 10a is set larger than on the downstream side. Therefore, the throat portion 10a is provided slightly upstream of the central portion of the tubular body 10, and is located on the partition wall 5 side of the resonance chamber 6.
12は共鳴室6内と管体10で形成された排気通路内と
を連通ずる開口で、管体10ののど部10aに下方に向
かって開けられている。13は例えばグラスウールなど
からなる吸音材で、排気消音器3の内面全体に貼着され
ている。Reference numeral 12 denotes an opening that communicates the interior of the resonance chamber 6 with the exhaust passage formed by the tubular body 10, and is opened downward in the throat portion 10a of the tubular body 10. Reference numeral 13 denotes a sound absorbing material made of, for example, glass wool, which is adhered to the entire inner surface of the exhaust silencer 3.
このように構成された内燃機関の排気消音装置において
は、排気は排気管2から第1膨張室7内に流入し、管体
10を通過して第2膨張室8内に流入した後にテールパ
イプ11から排出される。In the exhaust silencer for an internal combustion engine configured in this way, exhaust gas flows into the first expansion chamber 7 from the exhaust pipe 2, passes through the pipe body 10, flows into the second expansion chamber 8, and then flows into the tail pipe. It is discharged from 11.
管体10は、のど部10aで排気を絞ることによって、
絞りの無い円筒形の管体に比べて排気騒音に対する音響
イナータンスを増大させ、排気騒音を低減することがで
きる。共鳴室6は共鳴効果によって、排気騒音の音波の
一部が管体10の出口方向へ伝播するのを遮断し、排気
騒音を低減することができる。By restricting the exhaust gas at the throat portion 10a, the tube body 10
Compared to a cylindrical tube without a restriction, the acoustic inertance to exhaust noise can be increased and exhaust noise can be reduced. The resonance chamber 6 can block part of the sound waves of the exhaust noise from propagating toward the exit of the pipe body 10 due to the resonance effect, thereby reducing the exhaust noise.
ここで、管体lO内を通過する排気は、連続的に徐々に
絞られた後に、徐々に拡散するように流れるので、断面
積が変化することによって生ずる損失は小さなものとな
り、しかも、のど部10aの前後においては断面積が比
較的大きいので、摩擦損失も小さなものとなっている。Here, the exhaust gas passing through the tube body 10 is continuously and gradually constricted and then gradually diffused, so the loss caused by the change in cross-sectional area is small, and the throat Since the cross-sectional area is relatively large before and after 10a, the friction loss is also small.
そのため、通気抵抗が太き(なるのが抑えられている。Therefore, the ventilation resistance is suppressed.
また、管体10に設けた開口12によって、共鳴室6を
排気通路の断面積が小さな部位であるのど部10aに連
通しているので、共鳴による減衰効果を高めることがで
きる。Further, since the resonance chamber 6 is communicated with the throat portion 10a, which is a portion of the exhaust passage having a small cross-sectional area, through the opening 12 provided in the tube body 10, the damping effect due to resonance can be enhanced.
以上説明したように本発明によれば、排気通路の一部を
、断面積が排気の流れる方向に向かって漸次小さくなり
、のど部の下流において漸次太き(なる管体で形成した
から、排気通路の断面積を小さくしても、通気抵抗が大
きくなるのを抑えることができる。また、管体ののど部
に共鳴室内と排気通路内とを連通ずる開口を設けたから
、共鳴室と排気通路とを排気通路の断面積が小さな部位
において連通することができ、これにより共鳴による減
衰効果を高めることができる。As explained above, according to the present invention, a part of the exhaust passage is formed by a pipe body whose cross-sectional area gradually decreases in the direction in which the exhaust gas flows, and gradually becomes thicker downstream of the throat. Even if the cross-sectional area of the passage is made small, ventilation resistance can be suppressed from increasing.Also, since an opening is provided in the throat of the pipe body to communicate the resonance chamber and the exhaust passage, the resonance chamber and the exhaust passage are These can be communicated with each other at a portion where the cross-sectional area of the exhaust passage is small, thereby increasing the damping effect due to resonance.
したがって、消音性能を高めることができ、しかも、内
燃機関の出力低下を抑えることができる。Therefore, the silencing performance can be improved, and a decrease in the output of the internal combustion engine can be suppressed.
図は本発明に係る内燃機関の排気消音装置を示す一部断
面図である。
3・・・・排気消音器、4.5・・・・隔壁、6・・・
・共鳴室、10・・・・管体、10a・・・・のど部、
12・・・・開口。The figure is a partially sectional view showing an exhaust muffling device for an internal combustion engine according to the present invention. 3... Exhaust silencer, 4.5... Bulkhead, 6...
・Resonance chamber, 10...tube, 10a...throat,
12...Opening.
Claims (1)
が漸次小さくのど部において最小となり、こののど部の
下流において断面積が漸次大きくなる管体で形成し、こ
の管体ののど部に共鳴室内と排気通路内とを連通する開
口を設けてなる内燃機関の排気消音装置。A part of the exhaust passage is formed by a pipe whose cross-sectional area gradually decreases in the direction of flow of the exhaust, reaching its minimum at the throat, and whose cross-sectional area gradually increases downstream of this throat. An exhaust silencing device for an internal combustion engine, which is provided with an opening that communicates between a resonance chamber and an exhaust passage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25862985A JPS62121818A (en) | 1985-11-20 | 1985-11-20 | Exhaust muffler for internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25862985A JPS62121818A (en) | 1985-11-20 | 1985-11-20 | Exhaust muffler for internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62121818A true JPS62121818A (en) | 1987-06-03 |
Family
ID=17322928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP25862985A Pending JPS62121818A (en) | 1985-11-20 | 1985-11-20 | Exhaust muffler for internal combustion engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62121818A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3061933A1 (en) * | 2015-02-25 | 2016-08-31 | Honda Motor Co., Ltd. | Exhaust structure of straddle-type vehicle |
EP3163038A1 (en) * | 2015-10-30 | 2017-05-03 | Eberspächer Exhaust Technology GmbH & Co. KG | Silencer for an exhaust gas system of an internal combustion engine |
-
1985
- 1985-11-20 JP JP25862985A patent/JPS62121818A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3061933A1 (en) * | 2015-02-25 | 2016-08-31 | Honda Motor Co., Ltd. | Exhaust structure of straddle-type vehicle |
US9803522B2 (en) | 2015-02-25 | 2017-10-31 | Honda Motor Co., Ltd. | Exhaust structure of straddle-type vehicle, and vehicle incorporating same |
EP3163038A1 (en) * | 2015-10-30 | 2017-05-03 | Eberspächer Exhaust Technology GmbH & Co. KG | Silencer for an exhaust gas system of an internal combustion engine |
US10167756B2 (en) | 2015-10-30 | 2019-01-01 | Eberspächer Exhaust Technology GmbH & Co. KG | Muffler for an exhaust system of an internal combustion engine |
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