JPS6183406A - Exhaust muffler - Google Patents
Exhaust mufflerInfo
- Publication number
- JPS6183406A JPS6183406A JP20520184A JP20520184A JPS6183406A JP S6183406 A JPS6183406 A JP S6183406A JP 20520184 A JP20520184 A JP 20520184A JP 20520184 A JP20520184 A JP 20520184A JP S6183406 A JPS6183406 A JP S6183406A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- absorbing material
- cylinder body
- sound absorbing
- exhaust 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.)
- Granted
Links
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は排気マフラー、詳しくは排気の圧力変動に起
因する振動音を低減する排気マフラーに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust muffler, and more particularly to an exhaust muffler that reduces vibration noise caused by pressure fluctuations in exhaust gas.
（従来の技術）
周知のように、小型自動二輪車等に備えられる排気マフ
ラーとして、一対の半筒体を互いに接合固定して排気筒
体を形成し、エンジンの排気をこの排気筒体内を通過さ
せて消音するものがある。(Prior Art) As is well known, as an exhaust muffler for small motorcycles, etc., a pair of half cylinders are joined and fixed to each other to form an exhaust cylinder body, and the exhaust gas from the engine is passed through the exhaust cylinder body. There is something to muffle the sound.
この種の排気マフラーにおいて、エンジンの排気音中の
高周波成分は、排気筒体内に吸音材を配設することによ
り低減されるが、この手段では排気の圧力変動に起因す
る振動音を十分に低減することが困難である。従って、
この出願人は先に特開昭５６−６４１１４号公報に開示
されるように、排気筒体内周面に吸音材を配設して、排
気筒体が排気の圧力変動により振動しないようにし振動
音を防止する排気マフラーを提案した。In this type of exhaust muffler, high-frequency components in the engine exhaust sound are reduced by arranging sound-absorbing material inside the exhaust cylinder, but this method sufficiently reduces vibration noise caused by exhaust pressure fluctuations. difficult to do. Therefore,
As previously disclosed in Japanese Unexamined Patent Publication No. 56-64114, this applicant placed a sound-absorbing material on the inner circumferential surface of the exhaust cylinder to prevent the exhaust cylinder from vibrating due to pressure fluctuations in the exhaust gas. We proposed an exhaust muffler to prevent this.
（発明が解決しようとする問題点）
ところで、排気マフラーの振動音は排気の圧力変動で排
気筒体が振動し、これにより空気が振動することによっ
て発生している。従って、振動音の発生を効果的に防止
するためには、排気筒体の振動を極力抑制するとともに
、空気にその振動を伝達させないようにする必要がある
。(Problems to be Solved by the Invention) By the way, the vibration noise of the exhaust muffler is generated by the exhaust cylinder body vibrating due to the pressure fluctuation of the exhaust gas, and the air being vibrated thereby. Therefore, in order to effectively prevent the generation of vibration noise, it is necessary to suppress the vibration of the exhaust cylinder as much as possible and to prevent the vibration from being transmitted to the air.
この発明はかかる点に鑑みなされたもので、排気マフラ
ーを構成する排気筒体の振動を有効に抑制するとともに
、排気筒体の振動が空気に伝達することを極力抑え、排
気の圧力変動による振動音の発生をより有効に低減する
排気マフラーを提供することを目的としている。This invention was made in view of the above points, and it effectively suppresses the vibrations of the exhaust cylinder body that constitutes the exhaust muffler, and also suppresses as much as possible the transmission of the vibrations of the exhaust cylinder body to the air. The purpose of the present invention is to provide an exhaust muffler that more effectively reduces noise generation.
（問題点を解決するための手段）
この発明は前記の問題点を解決するために、一対の半筒
体を互いに接合固定して排気筒体を形成し、エンジンの
排気を前記排気筒体内を通過させて消音するようになし
た排気マフラーにおいて、前記排気筒体の少なくとも非
取付側の外面に、保持板により吸音材を圧接保持したこ
とを特徴としている。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention forms an exhaust cylinder body by joining and fixing a pair of half cylinders to each other, and directs the exhaust gas from the engine into the exhaust cylinder. The exhaust muffler is characterized in that a sound absorbing material is held in pressure contact with at least the outer surface of the non-attached side of the exhaust cylinder by a retaining plate.
（作用）
この発明では、排気マフラーの一対の半筒体を互いに接
合固定して形成した排気筒体に、吸音材が少なくとも非
取付側の外面に、保持板により圧接保持されており、排
気筒体内において、排気による圧力変動が生じると、こ
れにより排気筒体が振動しようとするが、排気筒体の外
面に吸音材が圧接して保持されているから、排気筒体の
振動は吸音材により軽減される。しかも、吸音材は排気
筒体の外面に圧接され、振動する排気筒体と空気との間
に配設されているから、排気筒体の振動が吸音材で遮断
されて空気を振動しないため、振動音は有効に低減され
る。(Function) In this invention, a sound absorbing material is held in pressure contact with at least the outer surface of the non-attached side of the exhaust cylinder body formed by joining and fixing a pair of half cylinder bodies of the exhaust muffler to each other, and the sound absorbing material is held in pressure contact with the retaining plate. When pressure fluctuations occur in the body due to exhaust gas, this causes the exhaust cylinder to vibrate, but since the sound-absorbing material is held in pressure contact with the outer surface of the exhaust cylinder, the vibrations of the exhaust cylinder are suppressed by the sound-absorbing material. Reduced. Moreover, since the sound-absorbing material is pressed against the outer surface of the exhaust cylinder and placed between the vibrating exhaust cylinder and the air, the vibration of the exhaust cylinder is blocked by the sound-absorbing material and does not vibrate the air. Vibration noise is effectively reduced.
（実施例）
以下、この発明の一実施例を添付図面に基づいて詳細に
説明する。(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.
第１図はこの発明を適用した排気マフラーの側面図、第
２図は平面図、第３図は一部を省略した第１図のＩＩＩ
−ＤＩ断面図、第４図は吸音材を保持する他の実施例
の断面図である。Fig. 1 is a side view of an exhaust muffler to which the present invention is applied, Fig. 2 is a plan view, and Fig. 3 is a partially omitted version of Fig. 1.
-DI sectional view, FIG. 4 is a sectional view of another embodiment that holds a sound absorbing material.
図に示す排気マフラーは小型の自動二輪車に搭載した内
燃機関に設けられるものであり、符号１は接続排気管で
、この接続排気管１の前側は図示しないエンジンの排気
通路に接続される。一方接続排気管１の後側には排気筒
体２が接続されている。The exhaust muffler shown in the figure is installed in an internal combustion engine mounted on a small motorcycle, and reference numeral 1 is a connecting exhaust pipe, and the front side of the connecting exhaust pipe 1 is connected to an exhaust passage of an engine (not shown). On the other hand, an exhaust cylinder body 2 is connected to the rear side of the connecting exhaust pipe 1 .
排気筒体２は、互いに略同形状に形成された一対の半筒
体３．４からなるもので、半筒体３，４の開口周縁に形
成されたフランジ部３ａ、４ａを強く圧接して、両者を
当接した状態でこのフランジ部３ａ、４ａをシーム溶接
することによって構成される。また、半筒体３，４には
補強リブ３ｂ、４ｂが形成され、モナカ状に形成された
排気筒体２を補強している。The exhaust cylinder body 2 is made up of a pair of half-cylinder bodies 3.4 that are formed in substantially the same shape as each other, and the flange parts 3a and 4a formed at the opening periphery of the half-cylinder bodies 3 and 4 are strongly pressed together. , by seam welding the flange portions 3a, 4a while they are in contact with each other. Furthermore, reinforcing ribs 3b and 4b are formed on the half-cylindrical bodies 3 and 4, reinforcing the exhaust cylinder body 2 formed in a monaka shape.
この排気筒体２の内部には隔壁５が設けられ。A partition wall 5 is provided inside the exhaust cylinder body 2 .
この隔！！！５により第１膨張室６と第２膨張室７とが
画一され、隔壁５には第１膨°張室６と第２膨張室７と
を連通ずる連通′ｉ１１′８が設けられている。This gap! ! ! 5, the first expansion chamber 6 and the second expansion chamber 7 are unified, and the partition wall 5 is provided with a communication 'i11'8 that communicates the first expansion chamber 6 and the second expansion chamber 7. .
排気筒体２内には排気導通管９が隔壁５に支持して内蔵
されており、この排気導通７９は接続排気管ｌに接続さ
れ、排気を第１膨張室６に導く。An exhaust conduit 9 is built into the exhaust cylinder body 2 and supported by the partition wall 5 , and this exhaust conduit 79 is connected to the connecting exhaust pipe 1 to guide exhaust gas to the first expansion chamber 6 .
この第１膨張室６の排気は連通管８を介して第２膨張室
７に導かれ、第２膨張室７の排気は半筒体３に設けられ
た排出管１０から大気に排出されるようになっている。The exhaust gas from the first expansion chamber 6 is led to the second expansion chamber 7 via the communication pipe 8, and the exhaust gas from the second expansion chamber 7 is discharged into the atmosphere from the exhaust pipe 10 provided in the half-cylindrical body 3. It has become.
排気筒体２を構成する半筒体３．４の内周面には、それ
ぞれ半筒体３，４と略同形状に形成された吸秀材１１が
支持板１２により支持されている。この支持板１２には
多数の孔１２ａが穿設されており、それぞれの膨張室６
−１７で膨張した排気がこの孔１２ａから吸音材１１に
導かれるようになっている。吸音材１１は高温度、高速
ガス魔に充分に耐え、多孔性の吸音性能がよいものが使
用される。この実施例ではグラスクールを使用している
が、アスベストやロックウール等を使用してもよい。On the inner circumferential surface of the half cylinders 3.4 constituting the exhaust cylinder body 2, absorbent materials 11 each formed in substantially the same shape as the half cylinders 3 and 4 are supported by a support plate 12. A large number of holes 12a are bored in this support plate 12, and each expansion chamber 6 is provided with a plurality of holes 12a.
The exhaust gas expanded at -17 is guided to the sound absorbing material 11 through this hole 12a. The sound-absorbing material 11 used is one that can sufficiently withstand high temperatures and high-velocity gas, and has good porous sound-absorbing performance. Although glass wool is used in this embodiment, asbestos, rock wool, etc. may also be used.
排気筒体２を構成する車体に取付ける取付側の半筒体４
にはブラダ−／ ト１３． Ｌ ４が１ｉｊ側と後側に
固定されている。前側のブラケット１３はエンジンに固
定され、後側のブラケット１４は車体に固定される。A half cylinder body 4 on the mounting side that is attached to the vehicle body forming the exhaust cylinder body 2
13. L4 is fixed on the 1ij side and the rear side. The front bracket 13 is fixed to the engine, and the rear bracket 14 is fixed to the vehicle body.
非取付側の即ち、車体外側に位置する半筒体３の外面に
は吸音材１５が保持板１６により圧接保持されている。A sound absorbing material 15 is held in pressure contact with the outer surface of the half cylinder 3 on the non-attached side, that is, located on the outside of the vehicle body, by a retaining plate 16.
保持板１６はその取付部１６ａを半筒体３の外面の４箇
所に溶接されたナー７ト１７に当てがい、ワンシャ１８
を介して螺着した締付ビス１９で締付固定されている。The retaining plate 16 has its mounting portion 16a applied to the nuts 17 welded to four locations on the outer surface of the half-cylindrical body 3, and the one-shaft 18
It is tightened and fixed with a tightening screw 19 screwed in through.
保持板１６は吸音材１５を圧接保持するとともに、ライ
ダーの脚部が排気により高温となっている排気筒体２に
（α接接触しないように保護する。吸音材１５はこの保
持板１６よりやや小さく形成され、外１７４の４箇所に
設けた取付切欠１５ａを前記ナツト１７に係合するよう
にして取付けられている。なお、吸音材１５は前記吸音
材１１と同様な材質のもので成形され、この実施例では
グラスウールを用いている。The retaining plate 16 holds the sound absorbing material 15 under pressure, and also protects the rider's legs from coming into (α) contact with the exhaust cylinder body 2, which is hot due to exhaust gas. The sound absorbing material 15 is formed of a small size and is mounted so that the mounting notches 15a provided at four locations on the outside 174 are engaged with the nut 17.The sound absorbing material 15 is molded from the same material as the sound absorbing material 11. , glass wool is used in this example.
また、吸音材１５の圧接保持は第４図に示すように、保
持板１６に形成した取付孔１６ｂにゴム等の弾性体２０
を嵌合し、この弾性体２０をナツト１７に挿着し、ワッ
シャ、１８を介して締付ビス１９で締付固定するように
してもよい。In addition, to hold the sound absorbing material 15 in pressure contact, as shown in FIG.
The elastic body 20 may be inserted into the nut 17 and fixed by tightening with the tightening screw 19 through the washer 18.
次に、この実施例の作用について説明する。Next, the operation of this embodiment will be explained.
図示しないエンジンから排気が接続排気管ｌ、排気導通
管９を介して第１膨張室６に導かれて膨張する。そして
、連通管８で収縮して第２膨張室７に導かれて再び膨張
し、さらに、排出管ｌＯを介して収縮し大気に放出され
る。Exhaust gas from an engine (not shown) is guided to the first expansion chamber 6 via a connecting exhaust pipe 1 and an exhaust conduit pipe 9, and is expanded. Then, it contracts through the communication pipe 8, is guided to the second expansion chamber 7, expands again, and is further contracted and discharged into the atmosphere through the discharge pipe IO.
このように排気は排気マフラー内で、膨張、収縮を繰返
すことにより消音されるとともに、排気筒体２の内周面
に配設した吸音材１５で排気音の高周波成分を消去する
。In this way, the exhaust gas is muffled by repeatedly expanding and contracting within the exhaust muffler, and the high frequency components of the exhaust sound are eliminated by the sound absorbing material 15 disposed on the inner peripheral surface of the exhaust cylinder body 2.
一方、排気音が排気筒体２内に導かれている間、排気の
圧力変動により排気筒体２が振動しようとするが、半筒
体３の外側面に吸音材１５が圧接して覆われているから
、排気筒体２に生じる振動させようとする力が抑制され
る。また、半筒体３の外面は吸音材１５で遮断されて直
接空気と接触しないようになっているため、排気筒体２
の振動で空気を振動させることが低減される。On the other hand, while the exhaust sound is being guided into the exhaust cylinder 2, the exhaust cylinder 2 tends to vibrate due to pressure fluctuations in the exhaust, but the sound absorbing material 15 presses against the outer surface of the half cylinder 3 and covers it. Therefore, the force generated in the exhaust cylinder body 2 to cause it to vibrate is suppressed. In addition, since the outer surface of the half cylinder body 3 is blocked by the sound absorbing material 15 to prevent direct contact with air, the exhaust cylinder body 3
Vibrations in the air due to vibrations are reduced.
なお、前記実施例では、排気筒体２の非取付側のみに吸
音材１５を圧接保持したが、取付側にも吸音材を設けて
もよいことは勿論である。In the above embodiment, the sound absorbing material 15 was held in pressure contact only on the non-attached side of the exhaust cylinder body 2, but it goes without saying that the sound absorbing material 15 may also be provided on the attached side.
（発明の効果）
この発明は前記のように、排気マフラーの一対の半筒体
を互いに接合固定して形成した排気筒体に、吸音材を排
気筒体の少なくとも非取付側の外面に、保持板により圧
接保持したから、排気マフラー内における排気による圧
力変動が生じて排気筒体が振動しようとしても、排気筒
体には吸音材が圧接保持されているから、排気筒体の振
動を有効に抑えることができ、しかも、吸音材は排気筒
体の外面に圧接されて、排気筒体の振動が空気に伝達さ
れないため、振動音は一層有効に低減される。(Effects of the Invention) As described above, the present invention has an exhaust cylinder body formed by joining and fixing a pair of half cylinder bodies of an exhaust muffler to each other, and a sound absorbing material is held on at least the outer surface of the non-attached side of the exhaust cylinder body. Since it is held in pressure contact with the plate, even if the exhaust cylinder body tries to vibrate due to pressure fluctuations due to exhaust gas in the exhaust muffler, the sound absorbing material is held in pressure contact with the exhaust cylinder body, so the vibration of the exhaust cylinder body is effectively suppressed. Moreover, since the sound-absorbing material is pressed against the outer surface of the exhaust cylinder and the vibration of the exhaust cylinder is not transmitted to the air, the vibration noise is further effectively reduced.
第１図はこの発明を適用した排気マフラーの側面図、第
２図は平面図、第３図は一部を省略した第１図のＩＩＩ
−Ｉ［Ｉ断面図、第４図は吸音材を保持する他の実施
例の断面図である。
ｌ・・・接続排気管 ２・・・排気筒体３．４
・・・半筒体 ９・・・排気導通管ｌＯ・−・
排出管 Ｉ Ｌ 、 １５・・・吸音材１６
・・・保持板 １９・・・締付ビス特 許
出 願 人 ヤマハ発動機株式会社第３図
２３ａ４ａ４
３ °・ １１
〆
６ａ
１９・ 、１７
１５荻
１８ ””−Ｙ＼
′１２ ・
・ １１９
７２＼、
２８（パ）
第４図Fig. 1 is a side view of an exhaust muffler to which the present invention is applied, Fig. 2 is a plan view, and Fig. 3 is a partially omitted version of Fig. 1.
-I[I sectional view, FIG. 4 is a sectional view of another embodiment that holds a sound absorbing material. l...Connection exhaust pipe 2...Exhaust cylinder body 3.4
...Half cylinder body 9...Exhaust conduit pipe lO・-・
Discharge pipe IL, 15...Sound absorbing material 16
...Holding plate 19...Tightening screw patent
Applicant Yamaha Motor Co., Ltd. Figure 3 23a4a4 3 °・ 11 〆6a 19・ , 17 15 18 ””-Y\'12 ・ 119 72\, 28 (Pa) Figure 4
Claims (1)
エンジンの排気を前記排気筒体内を通過させて消音する
ようになした排気マフラーにおいて、前記排気筒体の少
なくとも非取付側の外面に、保持板により吸音材を圧接
保持した排気マフラー。A pair of half cylinders are joined and fixed to each other to form an exhaust cylinder,
An exhaust muffler configured to muffle engine exhaust gas by passing it through the exhaust cylinder body, wherein a sound absorbing material is held under pressure by a retaining plate on at least the outer surface of the non-attached side of the exhaust cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20520184A JPS6183406A (en) | 1984-09-29 | 1984-09-29 | Exhaust muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20520184A JPS6183406A (en) | 1984-09-29 | 1984-09-29 | Exhaust muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6183406A true JPS6183406A (en) | 1986-04-28 |
| JPH0571763B2 JPH0571763B2 (en) | 1993-10-07 |
Family
ID=16503073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20520184A Granted JPS6183406A (en) | 1984-09-29 | 1984-09-29 | Exhaust muffler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6183406A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015034520A (en) * | 2013-08-09 | 2015-02-19 | 本田技研工業株式会社 | Exhaust device of motorcycle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014125586A1 (en) | 2013-02-13 | 2014-08-21 | 富士電機株式会社 | Semiconductor device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5560617A (en) * | 1978-10-31 | 1980-05-07 | Yamaha Motor Co Ltd | Structure for fixing muffler protector |
-
1984
- 1984-09-29 JP JP20520184A patent/JPS6183406A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5560617A (en) * | 1978-10-31 | 1980-05-07 | Yamaha Motor Co Ltd | Structure for fixing muffler protector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015034520A (en) * | 2013-08-09 | 2015-02-19 | 本田技研工業株式会社 | Exhaust device of motorcycle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0571763B2 (en) | 1993-10-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |