JP2663115B2 - Car silencer - Google Patents
Car silencerInfo
- Publication number
- JP2663115B2 JP2663115B2 JP15275195A JP15275195A JP2663115B2 JP 2663115 B2 JP2663115 B2 JP 2663115B2 JP 15275195 A JP15275195 A JP 15275195A JP 15275195 A JP15275195 A JP 15275195A JP 2663115 B2 JP2663115 B2 JP 2663115B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- pipe
- main
- exhaust gas
- outer cylinder
- 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 - Lifetime
Links
- 230000003584 silencer Effects 0.000 title claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000011358 absorbing material Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 28
- 230000000694 effects Effects 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上に利用分野】この発明は、吸音作用により高周
波音を消音するほか、排気抵抗の増加を抑制しながら共
鳴作用により特定周波数の低周波音を消音する装置のコ
ンパクト化を図った自動車用消音器に関する。
【０００２】
【従来の技術】従来の自動車用消音器においては、例え
ば特許出願公告昭６３−２８２０１の実施例に示されて
いるように、排気管の周面に設けた多数の孔を通じ排気
ガスを吸音材を充填した吸音型消音装置に導入し消音す
るほか、外筒と排気管によって形成される空間を隔壁で
区切って複数の空洞室を外筒内に配設する共鳴型消音装
置によって排気ガスの流れを変える複雑な排気通路を形
成する構造の装置が用いられてきた。
【０００３】
【発明が解決しようとする課題】しかしながら、複数の
共鳴空洞室と複雑な排気通路を配設した従来の消音器に
おいては、それらの共鳴空洞室や排気通路において排気
ガスの流れの方向が複雑に変化するために排気ガスが干
渉しあって、むしろ排気抵抗を増大させる原因を招き消
音器自体の排気作用を減衰させる問題があった。また、
従来の技術においては、エンジンからの排気ガスを分岐
管を通じ分流し、消音器本体に付属して設けられた別個
の共鳴消音器において消音するような装置が提供された
が、消音器自体のコンパクト化を実現して経済的な消音
器を提供するという目的は達成されていない。
【０００４】
【課題を解決するための手段】この発明の自動車用消音
器は、エンジンからの排気ガスの吸入口を形成するメイ
ン排気管の排気排出口を外筒内に配設し、排気ガスの大
気中への吐出口を形成する排気吐出管を、排気の流れの
上流側に向かってフレア状にしぼって形成し、その排気
導入口を形成する上流側の開口部を、排気排出口に挿設
し、メイン排気管と挿設された排気吐出管とのすき間の
排気通路を形成するメイン排気管の部分は無孔とし、上
流側に設けた吸音室とバッフルで仕切って下流側に共鳴
空洞室を設け、メイン排気管と排気吐出管とのすき間の
排気通路により共鳴空洞室とメイン排気管とが連通され
ている構造を特徴としている。
【０００５】
【作用】この発明の自動車用消音器においては、エンジ
ンからの排気ガス導入口と外筒内の主要な排気通路を形
成するメイン排気管に、排気ガスの大気への吐出口を形
成する排気吐出管を内設し、メイン排気管と上流側に設
けた吸音室とはメイン排気管の周面の多数孔で連通さ
れ、排気吐出管と下流側に設けた共鳴空洞室とは、メイ
ン排気管と内設された排気吐出管とのすき間に形成され
た排気通路で連通されているために、吸音室において高
周波音を効率よく消音するほか、メイン排気管と共鳴空
洞室を連通する排気通路における円滑な排気作用により
排気抵抗の増加を抑制し、共鳴空洞室の共鳴作用により
排気ガスの特定周波数の低周波音を効率よく消音する。
【０００６】
【実施例】以下添付図面により、この発明の自動車用消
音器を詳細に説明する。
【０００７】図１はこの発明の自動車用消音器の一実施
例を示す縦断側面図、図２及び図３は図１におけるＡ−
Ａ及びＢ−Ｂ部分のそれぞれ断面図である。
【０００８】各図において、１は消音器の本体を構成す
る外筒、２はメイン排気管、３はメイン排気管２の排気
排出口、４は排気吐出管、５は排気吐出管４の排気吸入
口、６はメイン排気管２の周面に穿設した多数孔、７は
メイン排気管２の無孔の部分、８は吸音室、９は吸音
材、１０はバッフル、１１は共鳴空洞室、１２はメイン
排気管２と、それに挿設した排気吐出管４とのすき間に
形成された排気通路である。エンジンから排気ガスの吸
入口を形成するメイン排気管２の排気排出口３に、上流
側に向かってフレア状にしぼって形成された排気吐出管
４の排気吸入口５を挿設し、メイン排気管２と、下流側
に排気ガスの大気中への吐出口を形成する排気吐出管４
とによって、エンジンからの排気ガスが大気中へ吐出さ
れる主要な排気通路を設ける。
【０００９】エンジンからメイン排気管２に導入された
排気ガスは、膨張、拡散してメイン排気管２の多数孔６
をとおり吸音室８に導入され、吸音材９により排気ガス
の発生する高周波音が効率よく吸音される。吸音室の排
気ガスは、メイン排気管２と排気吐出管４が形成する主
要な排気通路を流れるエンジンからの排気ガスの流れに
吸引されメイン排気管２に還流し、主要な排気通路の円
滑な排気作用により、その大部分が勢いよく大気中へ吐
出される。
【００１０】排気の流れの上流側に吸音室８と、吸音室
８とバッフル１０で仕切られ下流側に共鳴空洞室１１と
が配設されており、メイン排気管２と排気吐出管４との
すき間に形成される排気通路１２によって、共鳴空洞室
１１とメイン排気管２とは連通されている。メイン排気
管２から排気通路１２へ分流した排気ガスを共鳴空洞室
１１へ円滑に導入するため最適な断面積と容積をもった
排気通路１２を形成するため、メイン排気管２の内径
は、排気吐出管４の外径より大きく形成し、かつ排気通
路１２の部分のメイン排気管の周面は、無孔とすること
が好ましい。
【００１１】共鳴消音を必要とする一部の排気ガスは、
上述のように、排気抵抗の増加が抑制され円滑な排気作
用を伴う排気通路１２をとおりメイン排気管２から共鳴
空洞室１１へ導入され、共鳴空洞室１１における共鳴作
用により、排気ガスの発生する特定周波数の低周波音が
効率よく消音される。
【００１２】また、上述したような排気通路１２へ分流
し共鳴作用を通じ消音された一部の排気ガスが、排気通
路１２内の排気圧の変化に応じメイン排気管２へ還流す
る過程においても、無孔の排気吐出管４に仕切られて、
メイン排気管２から排気吐出管４をとおり大気中へ吐出
される流量の多い排気ガスと強く干渉しあうことがな
い。
【００１３】以上述べたように、この発明の自動車用消
音器の構造によれば、低周波音を吸収するために、別個
に、又は複数の共鳴室を設けたり複雑な排気通路により
排気ガスの流れの方向を変える必要がないので、消音器
自体をコンパクト化することができ、コンパクトな装置
でありながら高周波音と低周波音が消音できる経済的な
自動車用消音器を提供する。
【００１４】
【発明の効果】この発明による自動車用消音器は、簡単
な排気通路の構造により空気抵抗の増加を抑制して、効
率のよい吸音作用により高周波音を消音し、排気の円滑
な導入を伴う優れた共鳴装置により低周波音の除去に高
い効果が得られた。また、この構造によれば装置本体を
コンパクト化することができ、経済的な自動車用消音器
を提供する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention silences high-frequency sound by a sound absorbing effect and suppresses low-frequency sound of a specific frequency by a resonance effect while suppressing an increase in exhaust resistance. The present invention relates to a muffler for an automobile in which the size of the device is reduced. 2. Description of the Related Art In a conventional vehicle silencer, as shown in, for example, an embodiment of Japanese Patent Application Publication No. 63-28201, exhaust gas is exhausted through a large number of holes provided on the peripheral surface of an exhaust pipe. Is introduced into a sound-absorbing silencer filled with a sound-absorbing material and silenced.In addition, the space formed by the outer cylinder and the exhaust pipe is separated by a partition wall, and a plurality of hollow chambers are arranged in the outer cylinder. A device having a structure in which a complicated exhaust passage for changing a gas flow is formed has been used. [0003] However, in the conventional silencer in which a plurality of resonance cavities and a complicated exhaust passage are arranged, the flow direction of the exhaust gas in the resonance cavities and the exhaust passage is increased. However, there is a problem that exhaust gas interferes with each other due to a complicated change, and causes exhaust resistance to increase, thereby attenuating the exhaust action of the muffler itself. Also,
In the prior art, there has been provided a device in which exhaust gas from an engine is diverted through a branch pipe and silenced in a separate resonance silencer provided in association with the silencer body. The goal of providing an economical silencer by realization of the technology has not been achieved. [0004] In a vehicle silencer according to the present invention, an exhaust outlet of a main exhaust pipe forming an inlet of exhaust gas from an engine is disposed in an outer cylinder, and the exhaust gas is exhausted. An exhaust discharge pipe that forms a discharge port to the atmosphere is formed in a flared shape toward the upstream side of the flow of exhaust gas, and an upstream opening that forms the exhaust introduction port is formed as an exhaust discharge port. The part of the main exhaust pipe that is inserted and forms the exhaust passage between the main exhaust pipe and the inserted exhaust discharge pipe is made non-perforated, and is separated by a baffle from the sound absorption chamber provided on the upstream side and resonates downstream. It is characterized in that a cavity chamber is provided, and the resonance cavity chamber and the main exhaust pipe communicate with each other through an exhaust passage between a main exhaust pipe and an exhaust discharge pipe. According to the muffler for an automobile of the present invention, a discharge port for exhaust gas to the atmosphere is formed in a main exhaust pipe which forms an exhaust gas introduction port from an engine and a main exhaust passage in an outer cylinder. The main exhaust pipe and the sound absorbing chamber provided on the upstream side are communicated through a number of holes on the peripheral surface of the main exhaust pipe, and the exhaust discharge pipe and the resonance cavity chamber provided on the downstream side are: Since it is communicated with the exhaust passage formed in the gap between the main exhaust pipe and the internal exhaust discharge pipe, high-frequency sound can be efficiently silenced in the sound absorbing chamber, and the main exhaust pipe communicates with the resonance cavity chamber. An increase in exhaust resistance is suppressed by a smooth exhaust action in the exhaust passage, and a low-frequency sound of a specific frequency of exhaust gas is efficiently silenced by a resonance action of the resonance cavity. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a muffler for an automobile according to the present invention. FIG. 1 is a longitudinal sectional side view showing an embodiment of a vehicle silencer according to the present invention, and FIGS.
It is sectional drawing of A and BB part, respectively. In each of the drawings, reference numeral 1 denotes an outer cylinder constituting a main body of a silencer, 2 denotes a main exhaust pipe, 3 denotes an exhaust outlet of the main exhaust pipe 2, 4 denotes an exhaust discharge pipe, and 5 denotes an exhaust of the exhaust discharge pipe 4. Inlet, 6 is a multi-hole formed in the peripheral surface of the main exhaust pipe 2, 7 is a non-porous portion of the main exhaust pipe 2, 8 is a sound absorbing chamber, 9 is a sound absorbing material, 10 is a baffle, and 11 is a resonance cavity chamber. , 12 are exhaust passages formed between the main exhaust pipe 2 and the exhaust discharge pipe 4 inserted therein. An exhaust suction port 5 of an exhaust discharge pipe 4 formed in a flared shape toward the upstream side is inserted into an exhaust discharge port 3 of a main exhaust pipe 2 forming an intake port of exhaust gas from an engine. A pipe 2 and an exhaust discharge pipe 4 forming a discharge port for exhaust gas into the atmosphere on the downstream side
Thus, a main exhaust passage through which exhaust gas from the engine is discharged into the atmosphere is provided. Exhaust gas introduced into the main exhaust pipe 2 from the engine expands and diffuses, and the multi-holes 6 of the main exhaust pipe 2
The high frequency sound generated by the exhaust gas is efficiently absorbed by the sound absorbing material 9. The exhaust gas in the sound absorbing chamber is sucked by the flow of the exhaust gas from the engine flowing through the main exhaust passage formed by the main exhaust pipe 2 and the exhaust discharge pipe 4, and is returned to the main exhaust pipe 2 so that the main exhaust passage is smooth. Most of the gas is discharged into the atmosphere vigorously by the exhaust action. A sound absorbing chamber 8 is provided on the upstream side of the exhaust gas flow, and a resonance cavity chamber 11 is provided on the downstream side of the sound absorbing chamber 8 and is separated by the baffle 10. The resonance cavity chamber 11 and the main exhaust pipe 2 are communicated with each other by the exhaust passage 12 formed in the gap. In order to smoothly introduce the exhaust gas diverted from the main exhaust pipe 2 to the exhaust passage 12 into the resonance cavity chamber 11, the exhaust passage 12 having an optimum cross-sectional area and volume is formed. It is preferable that the outer diameter of the discharge pipe 4 be larger than that of the discharge pipe 4 and that the peripheral surface of the main exhaust pipe in the exhaust passage 12 be non-porous. Some exhaust gases that require resonance silencing are:
As described above, an increase in exhaust resistance is suppressed and the exhaust gas is introduced from the main exhaust pipe 2 into the resonance cavity chamber 11 through the exhaust passage 12 with a smooth exhaust operation, and exhaust gas is generated by the resonance operation in the resonance cavity chamber 11. Low frequency sound of a specific frequency is efficiently silenced. Further, in the above-described process in which part of the exhaust gas diverted to the exhaust passage 12 and silenced through the resonance action is returned to the main exhaust pipe 2 in accordance with a change in the exhaust pressure in the exhaust passage 12, Partitioned by a non-porous exhaust discharge pipe 4,
Exhaust gas discharged from the main exhaust pipe 2 to the atmosphere through the exhaust discharge pipe 4 and having a large flow rate does not strongly interfere with each other. As described above, according to the structure of the vehicle silencer of the present invention, in order to absorb low-frequency sound, separate or multiple resonance chambers are provided, or exhaust gas is exhausted through a complicated exhaust passage. Since there is no need to change the direction of the flow, the silencer itself can be made compact, and an economical automobile silencer capable of silencing high-frequency sound and low-frequency sound in a compact device is provided. The vehicle silencer according to the present invention suppresses an increase in air resistance by a simple exhaust passage structure, suppresses high-frequency noise by an efficient sound absorbing action, and smoothly introduces exhaust gas. An excellent resonance device with high efficiency was obtained for removing low-frequency sound. Further, according to this structure, the apparatus main body can be made compact, and an economical automobile silencer is provided.
【図面の簡単な説明】
図１は一実施例の縦断側面図、図２と図３は図１のＡ−
ＡとＢ−Ｂ部分の断面図、図４と図５は従来の消音器構
造を示す説明図、図６は従来の消音器の縦断側面図であ
る。各図において、１は外筒、２はメイン排気管、３は
メイン排気管の排気排出口、４は吐出管、５は吐出管の
吸入口、６は多数孔、７は無孔のメイン排気管部分、８
は吸音室、９は吸音材、１０はバッフル、１１は共鳴空
洞室、１２はメイン排気管と吐出管とのすき間の排気通
路である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional side view of one embodiment, and FIGS.
4 and 5 are explanatory views showing a conventional silencer structure, and FIG. 6 is a longitudinal sectional side view of the conventional silencer. In each figure, 1 is an outer cylinder, 2 is a main exhaust pipe, 3 is an exhaust outlet of a main exhaust pipe, 4 is a discharge pipe, 5 is a suction port of a discharge pipe, 6 is a multi-hole, and 7 is a non-porous main exhaust. Tube section, 8
Is a sound absorbing chamber, 9 is a sound absorbing material, 10 is a baffle, 11 is a resonance cavity chamber, and 12 is an exhaust passage between a main exhaust pipe and a discharge pipe.
Claims (1)
においてエンジンからの排気ガスの排気通路を形成し、
その周面に多数の孔（６）を穿設した排気管と、その外
筒と排気管との間に吸音材（９）を充填して形成した吸
音室と、その外筒と排気管との間に配設した共鳴空洞室
からなる自動車用消音器において、エンジンからの排気
ガスの吸入口を形成するメイン排気管（２）の排気排出
口（３）を外筒内に配設し、排気ガスの大気中への吐出
口を形成する排気吐出管（４）を、排気の流れの上流側
へフレア状にしぼって形成し、その排気導入口（５）を
メイン排気管の排気排出口（３）に挿設し、排気吐出管
とのすき間の排気通路（１２）を形成するメイン排気管
の部分（７）の周面は無孔とし、排気の流れの上流側に
配設する吸音室（８）とバッフル（１０）で仕切って排
気の流れの下流側に共鳴空洞室（１１）を配設し、共鳴
空洞室（１１）とメイン排気管（２）とが排気通路（１
２）により連通する構造を特徴とする自動車用消音器。(57) [Claims] An outer cylinder (1) constituting a main body of a silencer, and an exhaust passage for exhaust gas from an engine is formed in the outer cylinder,
An exhaust pipe having a plurality of holes (6) formed in its peripheral surface, a sound absorbing chamber formed by filling a sound absorbing material (9) between the outer cylinder and the exhaust pipe, and an outer cylinder and an exhaust pipe. An exhaust exhaust port (3) of a main exhaust pipe (2) forming an intake port for exhaust gas from an engine in an outer cylinder, wherein An exhaust discharge pipe (4) forming a discharge port of the exhaust gas into the atmosphere is formed by squeezing the exhaust gas upstream of the flow of exhaust gas into a flare shape, and the exhaust inlet (5) is formed as an exhaust discharge port of the main exhaust pipe. A peripheral surface of a part (7) of a main exhaust pipe which is inserted into (3) and forms a clearance between the exhaust discharge pipe and an exhaust passage (12) is made non-porous, and is provided on the upstream side of the flow of exhaust gas. A chamber (8) and a baffle (10) are separated from each other to provide a resonance cavity (11) downstream of the exhaust flow. In the exhaust pipe (2) and exhaust passages (1
A muffler for automobiles, characterized in that the muffler is connected to each other by 2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15275195A JP2663115B2 (en) | 1995-05-29 | 1995-05-29 | Car silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15275195A JP2663115B2 (en) | 1995-05-29 | 1995-05-29 | Car silencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08319817A JPH08319817A (en) | 1996-12-03 |
| JP2663115B2 true JP2663115B2 (en) | 1997-10-15 |
Family
ID=15547376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15275195A Expired - Lifetime JP2663115B2 (en) | 1995-05-29 | 1995-05-29 | Car silencer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2663115B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4573463B2 (en) * | 2001-04-04 | 2010-11-04 | フタバ産業株式会社 | Muffler for internal combustion engine |
| KR100946488B1 (en) * | 2008-06-03 | 2010-03-10 | 현대자동차주식회사 | Intake silencer for fuel cell vehicle and its manufacturing method |
| KR101258923B1 (en) * | 2010-12-24 | 2013-04-29 | 삼성중공업 주식회사 | Silencer |
| CN102518499A (en) * | 2011-11-29 | 2012-06-27 | 中国商用飞机有限责任公司 | Silencer |
| CN103114888B (en) * | 2013-02-01 | 2016-06-01 | 郑州宇通客车股份有限公司 | The muffling unit of sourdine and use the sourdine of this muffling unit |
| KR20240065663A (en) * | 2022-11-07 | 2024-05-14 | 현대자동차주식회사 | Silencer for fuel cell vehicle |
-
1995
- 1995-05-29 JP JP15275195A patent/JP2663115B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08319817A (en) | 1996-12-03 |
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