JPS6338524B2 - - Google Patents
Info
- Publication number
- JPS6338524B2 JPS6338524B2 JP57107748A JP10774882A JPS6338524B2 JP S6338524 B2 JPS6338524 B2 JP S6338524B2 JP 57107748 A JP57107748 A JP 57107748A JP 10774882 A JP10774882 A JP 10774882A JP S6338524 B2 JPS6338524 B2 JP S6338524B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- muffler
- exhaust
- exhaust gas
- introduction 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
Links
- 230000030279 gene silencing Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Characterised By The Charging Evacuation (AREA)
Description
【発明の詳細な説明】
本発明は内燃機関における排気系のマフラに関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a muffler for an exhaust system in an internal combustion engine.
この種のマフラにおいては、一般に、背圧と消
音性能とには強い関係があり、背圧を低減させる
に従い消音性能が悪化する。また、背圧は、燃費
向上、エンジン出力の向上の見地から、低ければ
低いほど良いが、しかし、消音性能についても向
上させる必要があるため、一般に消音性能との兼
合いで背圧の大きさが決められている。 In this type of muffler, there is generally a strong relationship between back pressure and silencing performance, and as back pressure is reduced, silencing performance deteriorates. In addition, from the standpoint of improving fuel efficiency and engine output, the lower the back pressure, the better. However, since it is also necessary to improve the noise reduction performance, the size of the back pressure is generally determined in consideration of the noise reduction performance. has been decided.
従来、第1図に示すように、外筒1内に、2〜
3枚の仕切板2と3〜4本のパイプ3を組み込ん
でマフラを構成したものにおいては、背圧と消音
性能の妥協点を見い出して、それぞれの寸法が決
められているが、排気が仕切板2等に当り、背圧
が極めて高くなり、燃費向上、エンジン出力向上
に抑圧される欠点がある。 Conventionally, as shown in FIG.
In a muffler constructed by incorporating three partition plates 2 and three to four pipes 3, the dimensions of each are determined by finding a compromise between back pressure and noise reduction performance, but the exhaust This has the drawback that the back pressure is extremely high due to contact with the plate 2, etc., which inhibits improvements in fuel efficiency and engine output.
そこで本発明は、排気ガスを流れやすくして背
圧を低減させるとともに消音性能も悪化されない
マフラを提供することを目的とするもので、すな
わち、排気導入管をマフラ内部に直線的に延長し
てその後端をマフラ内部に開口して直伸管とし、
且つ前記排気導入管には、排気導出管8を、分岐
して、その後端をマフラ外部に開口させ、更に前
記排気導入管及びこれにつらなる管体の適所に小
穴を形成したことを特徴とするものである。 Therefore, an object of the present invention is to provide a muffler that allows exhaust gas to flow easily and reduces back pressure, while also not deteriorating the silencing performance. The rear end is opened inside the muffler to form a straight pipe,
Further, the exhaust inlet pipe is characterized in that the exhaust outlet pipe 8 is branched, the rear end thereof is opened to the outside of the muffler, and small holes are formed at appropriate positions in the exhaust inlet pipe and the pipe body connected thereto. It is something.
次に第2図に示す本発明の実施例について説明
する。 Next, an embodiment of the present invention shown in FIG. 2 will be described.
マフラを構成する外周壁は、外筒4及び前後壁
5,5により形成されている。6は排気導入管
で、該管6はマフラ内を直線的に後方へ延長され
て共嗚現象発生管7となり、その後端7aは、前
記外周壁により密閉されたマフラ内部空間に開口
されている。該共嗚現象発生管7の径及び寸法
は、マフラ内部空間との関係において、ヘルムホ
ルツの共嗚現象が引き起こされるように設定され
ている。排気導入管6より共嗚現象発生管7に至
る部分には、排気導出管8が後方へ指向して分岐
されていると共にその後端がマフラ外部の排気管
に連通されている。該排気導出管8の分岐部8a
は、排気導入管6より流入した排気が、排気導出
管8へ抵抗が少なく流通するように、円弧をもつ
て形成されている。尚、前記排気導入管6、直伸
管7、排気導出管8は、共に同一断面のパイプを
使用している。 The outer peripheral wall constituting the muffler is formed by an outer cylinder 4 and front and rear walls 5, 5. Reference numeral 6 denotes an exhaust gas introduction pipe, and the pipe 6 is linearly extended rearward within the muffler to become a resonance phenomenon generating pipe 7, and its rear end 7a is opened into the muffler internal space sealed by the outer peripheral wall. . The diameter and dimensions of the resonance phenomenon generating tube 7 are set so that the Helmholtz resonance phenomenon is caused in relation to the muffler internal space. At a portion extending from the exhaust gas introduction pipe 6 to the resonance phenomenon generating pipe 7, an exhaust gas discharge pipe 8 is branched toward the rear, and its rear end is communicated with an exhaust pipe outside the muffler. Branch portion 8a of the exhaust outlet pipe 8
is formed in an arc shape so that the exhaust gas flowing in from the exhaust gas introduction pipe 6 flows to the exhaust gas discharge pipe 8 with little resistance. Incidentally, the exhaust gas introduction pipe 6, the straight pipe 7, and the exhaust gas discharge pipe 8 all use pipes having the same cross section.
前記排気導入管6、直伸管7、排気導出管8の
適所には、小穴9が設けられている。 Small holes 9 are provided at appropriate locations in the exhaust gas introduction pipe 6, the straight pipe 7, and the exhaust gas discharge pipe 8.
以上のようであるから、排気導入管6よりの排
気は、直線状に配管された直伸管7を通じてマフ
ラ内部空間に流出されることにより、ヘルムホル
ツの共嗚現象が引き起こされて消音される。ま
た、直伸管7内は導入された排気により昇圧され
るから、排気導入管6より流入する排気は、分岐
された排気導出管8へ誘導されて排出される。こ
のとき、排気導出管8は後端がマフラ外部に開口
した連通管であることにより、排気の流出に対す
る抵抗が少なく、そのため背圧を低く抑えること
ができる。また、排気導出管8の分岐部8aを単
曲線、反曲線とすれば、前記の抵抗の減少を向上
することができる。特にこの発明では、排気導入
管及びこれにつらなる管体の適所に小穴9を設け
たことにより該小穴部よりマフラ内部空間に流出
した排気管は拡張現象を起し音圧が減衰されて消
音される上に前記直伸管の後端7aより流出する
排気と干渉して消音される。 As described above, the exhaust gas from the exhaust introduction pipe 6 is discharged into the muffler internal space through the straight pipe 7 arranged in a straight line, thereby causing the Helmholtz resonance phenomenon and muffling the noise. Further, since the pressure inside the straight pipe 7 is increased by the introduced exhaust gas, the exhaust gas flowing from the exhaust gas introduction pipe 6 is guided to the branched exhaust gas outlet pipe 8 and discharged. At this time, since the exhaust outlet pipe 8 is a communicating pipe whose rear end is open to the outside of the muffler, there is little resistance to the outflow of exhaust gas, and therefore back pressure can be kept low. Furthermore, if the branch portion 8a of the exhaust outlet pipe 8 is formed into a single curve or a reciprocal curve, the above-mentioned reduction in resistance can be improved. In particular, in this invention, by providing the small hole 9 at a suitable location in the exhaust introduction pipe and the pipe body connected thereto, the exhaust pipe flowing out from the small hole into the muffler internal space causes an expansion phenomenon, and the sound pressure is attenuated and the sound is muffled. In addition, it interferes with the exhaust gas flowing out from the rear end 7a of the straight pipe, thereby muffling the noise.
以上のように本発明によれば、消音性能を悪化
させることなく背圧を低減でき、エンジンの燃費
向上、出力向上を図ることができる。 As described above, according to the present invention, the back pressure can be reduced without deteriorating the silencing performance, and the fuel efficiency and output of the engine can be improved.
第1図は従来のマフラを示す略断面図、第2図
は本発明の実施例を示す側断面図、第3図は同B
―B線断面図である。
6…排気導入管、7…直伸管、7a…開口端、
8…排気導入管、8a…分岐部、9…小穴。
Fig. 1 is a schematic sectional view showing a conventional muffler, Fig. 2 is a side sectional view showing an embodiment of the present invention, and Fig. 3 is a schematic sectional view showing a conventional muffler.
- This is a cross-sectional view taken along line B. 6...Exhaust introduction pipe, 7...straight extension pipe, 7a...open end,
8...Exhaust introduction pipe, 8a...Branch portion, 9...Small hole.
Claims (1)
その後端をマフラ内部に開口して直伸管7とし、
且つ前記排気導入管には、排気導出管8を分岐し
て、その後端をマフラ外部に開口させ、更に前記
排気導入管及びこれにつらなる管体の適所に小穴
を形成したことを特徴とする内燃機関における排
気系のマフラ。1 Extend the exhaust introduction pipe linearly into the muffler and open the rear end into the muffler to form a straight pipe 7,
The exhaust introduction pipe has an exhaust outlet pipe 8 branched off, the rear end of which is opened to the outside of the muffler, and small holes are formed at appropriate positions in the exhaust introduction pipe and the pipe body connected thereto. A muffler for the exhaust system of an engine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10774882A JPS59514A (en) | 1982-06-23 | 1982-06-23 | Muffler of exhaust system in internal-combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10774882A JPS59514A (en) | 1982-06-23 | 1982-06-23 | Muffler of exhaust system in internal-combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59514A JPS59514A (en) | 1984-01-05 |
JPS6338524B2 true JPS6338524B2 (en) | 1988-08-01 |
Family
ID=14466964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10774882A Granted JPS59514A (en) | 1982-06-23 | 1982-06-23 | Muffler of exhaust system in internal-combustion engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59514A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10975743B1 (en) | 2020-03-13 | 2021-04-13 | Tenneco Automotive Operating Company Inc. | Vehicle exhaust component |
US11199116B2 (en) | 2017-12-13 | 2021-12-14 | Tenneco Automotive Operating Company Inc. | Acoustically tuned muffler |
US11268430B2 (en) | 2019-01-17 | 2022-03-08 | Tenneco Automotive Operating Company Inc. | Diffusion surface alloyed metal exhaust component with welded edges |
US11268429B2 (en) | 2019-01-17 | 2022-03-08 | Tenneco Automotive Operating Company Inc. | Diffusion surface alloyed metal exhaust component with inwardly turned edges |
US11365658B2 (en) | 2017-10-05 | 2022-06-21 | Tenneco Automotive Operating Company Inc. | Acoustically tuned muffler |
US11702969B2 (en) | 2017-10-05 | 2023-07-18 | Tenneco Automotive Operating Company Inc. | Acoustically tuned muffler |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0716007Y2 (en) * | 1986-04-09 | 1995-04-12 | 三恵工業株式会社 | Mufflers for automobiles |
JP2545086B2 (en) * | 1987-06-05 | 1996-10-16 | マツダ株式会社 | Engine exhaust system |
DE102006008941A1 (en) * | 2006-02-23 | 2007-08-30 | J. Eberspächer GmbH & Co. KG | Silencer for an exhaust system |
JP5992768B2 (en) * | 2012-08-29 | 2016-09-14 | 株式会社三五 | Vehicle exhaust system structure |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5517956B2 (en) * | 1975-03-12 | 1980-05-15 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS587049Y2 (en) * | 1978-07-24 | 1983-02-07 | カルソニックカンセイ株式会社 | muffler |
-
1982
- 1982-06-23 JP JP10774882A patent/JPS59514A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5517956B2 (en) * | 1975-03-12 | 1980-05-15 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11365658B2 (en) | 2017-10-05 | 2022-06-21 | Tenneco Automotive Operating Company Inc. | Acoustically tuned muffler |
US11702969B2 (en) | 2017-10-05 | 2023-07-18 | Tenneco Automotive Operating Company Inc. | Acoustically tuned muffler |
US11199116B2 (en) | 2017-12-13 | 2021-12-14 | Tenneco Automotive Operating Company Inc. | Acoustically tuned muffler |
US11268430B2 (en) | 2019-01-17 | 2022-03-08 | Tenneco Automotive Operating Company Inc. | Diffusion surface alloyed metal exhaust component with welded edges |
US11268429B2 (en) | 2019-01-17 | 2022-03-08 | Tenneco Automotive Operating Company Inc. | Diffusion surface alloyed metal exhaust component with inwardly turned edges |
US10975743B1 (en) | 2020-03-13 | 2021-04-13 | Tenneco Automotive Operating Company Inc. | Vehicle exhaust component |
Also Published As
Publication number | Publication date |
---|---|
JPS59514A (en) | 1984-01-05 |
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