JPH07229415A - Silencer having sound absorbing material - Google Patents
Silencer having sound absorbing materialInfo
- Publication number
- JPH07229415A JPH07229415A JP4776694A JP4776694A JPH07229415A JP H07229415 A JPH07229415 A JP H07229415A JP 4776694 A JP4776694 A JP 4776694A JP 4776694 A JP4776694 A JP 4776694A JP H07229415 A JPH07229415 A JP H07229415A
- Authority
- JP
- Japan
- Prior art keywords
- absorbing material
- sound absorbing
- silencer
- thickness
- container
- 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
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は例えば内燃機関の吸気
系、排気系等に装着される拡張型の消音器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expandable silencer mounted on, for example, an intake system, an exhaust system of an internal combustion engine.
【0002】[0002]
【従来の技術】例えば内燃機関の空気吸入管の途中に筒
状の容器を設け、拡張型の消音器としたものがある。そ
の場合吸音材を容器の側壁内側に内貼りして、消音効果
を高めたものもある。一般にこの吸音材の厚さにより消
音特性が変化し、吸音材の厚さを厚くすると、消音され
る周波数域のピークが低周波側に移行することが知られ
ている。2. Description of the Related Art For example, there is an expansion type silencer in which a cylindrical container is provided in the middle of an air intake pipe of an internal combustion engine. In that case, there is also one in which a sound absorbing material is attached inside the side wall of the container to enhance the sound deadening effect. It is generally known that the sound deadening characteristic changes depending on the thickness of the sound absorbing material, and that when the thickness of the sound absorbing material is increased, the peak of the frequency range to be muted shifts to the low frequency side.
【0003】従来のものは図3に示すように気体の流通
管例えば内燃機関の空気吸入管15の途中に円筒状の容
器12を取付け、その側壁内面に吸音材13(厚さt)
を貼付して消音器11をとしている。吸音材13は例え
ば合成樹脂の発泡体であり、容器12の側壁内面に接着
剤で貼付する。その消音特性は図3の曲線Aで示され
る。また吸音材の厚さを一様に増して図3の14(厚さ
T)のようにすれば図4の曲線Bのように消音特性のピ
ークが低周波側へ移行する。As shown in FIG. 3, in the conventional case, a cylindrical container 12 is attached in the middle of a gas flow pipe, for example, an air intake pipe 15 of an internal combustion engine, and a sound absorbing material 13 (thickness t) is formed on the inner surface of the side wall thereof.
Is attached to the silencer 11. The sound absorbing material 13 is, for example, a synthetic resin foam, and is attached to the inner surface of the side wall of the container 12 with an adhesive. The silencing characteristic is shown by the curve A in FIG. Further, if the thickness of the sound absorbing material is uniformly increased to 14 (thickness T) in FIG. 3, the peak of the sound deadening characteristic shifts to the low frequency side as shown by the curve B in FIG.
【0004】[0004]
【発明が解決しようとする課題】消音器で消滅あるいは
減衰させようとする騒音の周波数が、特定の周波数をピ
ークとする曲線状の分布になっている場合は、従来の消
音器の消音特性のピークを騒音のピークに合致させるよ
うに設定すればよいが、騒音周波数に顕著なピークがな
く広域に分布する場合や、広い周波数域にわたって消音
したい場合などは、従来のものは特性が適合せず、全体
としては消音効果が小さいものとなる。When the frequency of the noise to be extinguished or attenuated by the muffler has a curved distribution having a specific frequency as a peak, the muffling characteristics of the conventional muffler are reduced. The peaks should be set so that they match the noise peaks, but if the noise frequency has no significant peaks and is distributed over a wide area, or if you want to mute over a wide frequency range, the characteristics are not compatible with the conventional ones. , The sound deadening effect is small as a whole.
【0005】[0005]
【課題を解決するための手段】この発明の消音器は、円
筒形をなす容器の側壁内面に筒状の吸音材を取付け、吸
音材の半径方向厚さを軸方向に順次に厚さを変化させ、
吸音材内面がテーパ面をなすように形成したものであ
る。In the muffler of the present invention, a cylindrical sound absorbing material is attached to the inner surface of the side wall of a cylindrical container, and the thickness of the sound absorbing material is varied in the radial direction in the axial direction. Let
The inner surface of the sound absorbing material is formed so as to form a tapered surface.
【0006】[0006]
【作用】この消音器は容器の両端面がそれぞれ気体の流
通管の途中に接続されて使用される。流通管の一方側か
ら流入した気体は拡張された容器内で騒音が消滅あるい
は減衰して他方側の流通管から流出する。その際吸音材
は順次に内面径が変化し厚さが変化しているので、それ
ぞれに対応した周波数について騒音減衰作用をする。従
って減衰される騒音の周波数域は広域となる。In this muffler, both end faces of the container are used by connecting them in the middle of gas flow pipes. The gas that has flowed in from one side of the flow pipe has its noise eliminated or attenuated in the expanded container and flows out from the flow pipe on the other side. At that time, since the inner diameter of the sound absorbing material changes and the thickness of the sound absorbing material changes in sequence, the sound absorbing material has a noise damping effect for each frequency. Therefore, the frequency range of the attenuated noise is wide.
【0007】[0007]
【実施例】図1に実施例の消音器を示す。消音器1は円
筒状の合成樹脂製の容器(鉄板製などでもよい)2内に
合成樹脂発泡体でなる吸音材3を配設したものである。
吸音材3は筒状をなして容器2の側壁内面に接着剤で貼
付されている。吸音材3の半径方向厚さDは容器の一方
側端面から他方側端面への軸方向位置に応じ順次に大と
なり、従って吸音材3の内面はテーパ面となっている。
消音器1は例えば内燃機関の空気吸入管4の途中に端面
の一方側と他方側が接続される。EXAMPLE FIG. 1 shows a muffler according to an example. The muffler 1 is a cylindrical container made of synthetic resin (which may be made of iron plate, etc.) 2 in which a sound absorbing material 3 made of synthetic resin foam is arranged.
The sound absorbing material 3 has a tubular shape and is attached to the inner surface of the side wall of the container 2 with an adhesive. The radial thickness D of the sound absorbing material 3 gradually increases according to the axial position from the one end surface to the other end surface of the container, so that the inner surface of the sound absorbing material 3 is a tapered surface.
The silencer 1 has one end face and the other end face connected to the middle of an air intake pipe 4 of an internal combustion engine, for example.
【0008】内燃機関の燃焼用空気は空気吸入管4を流
入し、容器2内で消音作用を受けて流出側へ出る。この
場合吸音材3の厚さが順次に変化しているため、減衰作
用をうける周波数域が広域にわたり、図4の曲線Cのよ
うな消音特性となりピークは従来のものより低下するが
広域周波数の騒音に適合し、全体としての消音作用は大
である。Combustion air of the internal combustion engine flows in through the air suction pipe 4, receives a sound deadening effect in the container 2, and exits to the outflow side. In this case, since the thickness of the sound absorbing material 3 is sequentially changed, the frequency range subjected to the damping action is wide and the sound deadening characteristic is as shown by the curve C in FIG. It is suitable for noise and has a great sound deadening effect as a whole.
【0009】図2に他の実施例を示す。図2の消音器5
の容器2は図1のものと同様であり、空気吸入管4の途
中に装着される。吸音材6は図1のものと異なりグラス
ウールでなる。金網を切頭円錘形に形成した支持体7の
上下端面が容器2の両端面に接着または溶接により取付
けてあり、吸音材6は容器2の内面と支持体7の外面と
の間に充填される。こうして吸音材6は軸方向に順次厚
さが変化し、内面が支持体7に従ったテーパ面となる。
吸音材6はこの場合グラスウールに限らず繊維質でなる
適宜のウェブでよい。この消音器5の消音特性も図4の
曲線Cとほぼ同様な尖頭部分のない形状を示す。これら
の消音器は上記の例のほか、内燃機関の排気系や、その
他のガス体の流動ダクト等に広く適用することができ
る。FIG. 2 shows another embodiment. Muffler 5 in FIG.
The container 2 is the same as that shown in FIG. 1, and is installed in the middle of the air suction pipe 4. The sound absorbing material 6 is made of glass wool unlike the one shown in FIG. The upper and lower end surfaces of the support body 7 in which the wire mesh is formed into a truncated cone shape are attached to both end surfaces of the container 2 by adhesion or welding, and the sound absorbing material 6 is filled between the inner surface of the container 2 and the outer surface of the support body 7. To be done. In this way, the thickness of the sound absorbing material 6 changes in the axial direction sequentially, and the inner surface becomes a tapered surface according to the support 7.
In this case, the sound absorbing material 6 is not limited to glass wool, but may be an appropriate web made of fiber. The muffling characteristic of the muffler 5 also shows a shape without a pointed portion, which is almost the same as the curve C in FIG. These mufflers can be widely applied to the exhaust system of an internal combustion engine, other gas flow ducts, and the like, in addition to the above examples.
【0010】[0010]
【発明の効果】この発明は、吸音材の内面をテーパ面と
したことにより、騒音の周波数域が広域にわたる場合消
音特性を騒音の周波数に広く合致させるようにして消音
効果を大にすることができる。従って従来の1個の消音
器では減衰しない騒音領域が残存するというようなこと
はなくなり、また複数個の消音器を取付けて対応するな
ども不要となる。According to the present invention, by making the inner surface of the sound absorbing material a taper surface, the sound deadening effect can be made large by matching the sound deadening characteristics to the frequency of the noise widely when the frequency range of the noise is wide. it can. Therefore, no noise region that is not attenuated by one conventional silencer does not remain, and it is not necessary to attach a plurality of silencers to cope with the noise.
【図1】実施例の断面図FIG. 1 is a sectional view of an embodiment.
【図2】他の実施例の断面図FIG. 2 is a sectional view of another embodiment.
【図3】従来の消音器の断面図FIG. 3 is a sectional view of a conventional silencer.
【図4】消音器の消音特性線図[Fig. 4] Silent characteristic diagram of silencer
2 容器 3、6 吸音材 2 containers 3, 6 sound absorbing material
Claims (1)
取付け、容器の側壁内面に吸音材を取付けた拡張型の消
音器において、吸音材の半径方向厚さを軸方向に順次異
ならせ、吸音材内面をテーパ面とした消音器。1. An expansion type silencer in which a gas flow pipe is attached to both front and rear ends of a cylindrical container and a sound absorbing material is attached to an inner surface of a side wall of the container, and the radial thickness of the sound absorbing material is sequentially varied in the axial direction. , A silencer with a tapered inner surface of the sound absorbing material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4776694A JPH07229415A (en) | 1994-02-21 | 1994-02-21 | Silencer having sound absorbing material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4776694A JPH07229415A (en) | 1994-02-21 | 1994-02-21 | Silencer having sound absorbing material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07229415A true JPH07229415A (en) | 1995-08-29 |
Family
ID=12784501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4776694A Pending JPH07229415A (en) | 1994-02-21 | 1994-02-21 | Silencer having sound absorbing material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07229415A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006075670A1 (en) * | 2005-01-13 | 2006-07-20 | Smc Kabushiki Kaisha | Silencer |
JP2012215103A (en) * | 2011-03-31 | 2012-11-08 | Toyota Motor Corp | Muffler for fuel cell vehicle |
JP2019215085A (en) * | 2013-12-09 | 2019-12-19 | デイコ アイピー ホールディングス, エルエルシーDayco Ip Holdings, Llc | Noise attenuation unit for engine systems |
CN112873538A (en) * | 2021-03-25 | 2021-06-01 | 福建信达机械有限公司 | Noise control device for dust treatment of urban commercial concrete mixing plant |
WO2022202975A1 (en) | 2021-03-25 | 2022-09-29 | 富士フイルム株式会社 | Acoustic impedance change structure and ventilation-type silencer |
-
1994
- 1994-02-21 JP JP4776694A patent/JPH07229415A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006075670A1 (en) * | 2005-01-13 | 2006-07-20 | Smc Kabushiki Kaisha | Silencer |
KR100868328B1 (en) * | 2005-01-13 | 2008-11-12 | 에스엠씨 가부시키 가이샤 | Silencer |
US7753167B2 (en) | 2005-01-13 | 2010-07-13 | Smc Kabushiki Kaisha | Silencer |
JP2012215103A (en) * | 2011-03-31 | 2012-11-08 | Toyota Motor Corp | Muffler for fuel cell vehicle |
JP2019215085A (en) * | 2013-12-09 | 2019-12-19 | デイコ アイピー ホールディングス, エルエルシーDayco Ip Holdings, Llc | Noise attenuation unit for engine systems |
CN112873538A (en) * | 2021-03-25 | 2021-06-01 | 福建信达机械有限公司 | Noise control device for dust treatment of urban commercial concrete mixing plant |
CN112873538B (en) * | 2021-03-25 | 2022-06-14 | 福建信达机械有限公司 | Noise control device for dust treatment of urban commercial concrete mixing plant |
WO2022202975A1 (en) | 2021-03-25 | 2022-09-29 | 富士フイルム株式会社 | Acoustic impedance change structure and ventilation-type silencer |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5726397A (en) | Vehicle exhaust device | |
US4368799A (en) | Straight-through flow muffler | |
US8256569B1 (en) | Exhaust sound attenuation device and method of use | |
US4046219A (en) | Exhaust silencer apparatus for internal combustion engine | |
JPH0714114U (en) | Active silencer | |
US5571242A (en) | Engine airflow system and method | |
US3480105A (en) | Device for silencing gas flow streams | |
JPH07229415A (en) | Silencer having sound absorbing material | |
JP2004519575A (en) | Device for damping resonance in conduit | |
US5449866A (en) | Arrangement for damping sound in a pipe system | |
JP2000110544A (en) | Muffler | |
JP2010031852A (en) | Motorcycle | |
JP2515905Y2 (en) | Silencer | |
JP3078253B2 (en) | Silencer for internal combustion engine | |
JP3449460B2 (en) | Vehicle muffler | |
JPS6217087B2 (en) | ||
JPH0122888Y2 (en) | ||
JPS6221702Y2 (en) | ||
JP2583184B2 (en) | Muffler for internal combustion engine | |
JPH06280553A (en) | Silencer | |
JPH07229416A (en) | Silencer having sound absorbing material mounted thereon | |
JPS58148215A (en) | Muffler of automobile engine | |
JP2601585Y2 (en) | Silencer | |
JPS6013912A (en) | Silencer | |
JPH0148376B2 (en) |