JPH1030426A - Noise absorber and muffler using the same - Google Patents
Noise absorber and muffler using the sameInfo
- Publication number
- JPH1030426A JPH1030426A JP18904096A JP18904096A JPH1030426A JP H1030426 A JPH1030426 A JP H1030426A JP 18904096 A JP18904096 A JP 18904096A JP 18904096 A JP18904096 A JP 18904096A JP H1030426 A JPH1030426 A JP H1030426A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- muffler
- cylindrical bodies
- bodies
- cylindrical
- 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.)
- Withdrawn
Links
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は吸音体及びこれを用
いた消音器に関する。The present invention relates to a sound absorber and a muffler using the same.
【０００２】[0002]
【従来の技術】従来、吸音体として、実開平４−５４９
１８号公報に開示されているように、多数の小孔を有す
る薄肉板と多数の小孔を有する薄平板とを交互に重ね、
これらを多重に巻回して構成したもの（これを第１の従
来の技術とする）や、実開平６−８７１８号公報に開示
されているように、上記の吸音体を自動車の排気系に組
み込まれる消音器内のパイプ外周に巻設して消音器を構
成したもの（これを第２の従来技術とする）や、更に、
実開昭６０−２３２０７号公報に開示されているよう
に、パイプの外周に１枚の無孔板のみを螺旋状に巻回す
るとともにその両端を端板で閉塞してその板間で螺旋状
通路を形成した消音器（これを第３の従来の技術とす
る）がある。2. Description of the Related Art Conventionally, as a sound absorber, a conventional Japanese Utility Model Laid-Open No. 4-549 has been proposed.
As disclosed in Japanese Patent Publication No. 18, a thin plate having a large number of small holes and a thin plate having a large number of small holes are alternately stacked,
These sound absorbers are incorporated in an exhaust system of an automobile, as disclosed in Japanese Unexamined Utility Model Publication No. 6-8718. A muffler wound around a pipe inside a muffler (hereinafter referred to as a second conventional technique),
As disclosed in Japanese Utility Model Application Laid-Open No. 23207/1985, only one non-perforated plate is spirally wound around the outer periphery of a pipe, and both ends are closed with end plates to form a spiral between the plates. There is a silencer having a passage (this is referred to as a third conventional technique).
【０００３】[0003]
【発明が解決しようとする課題】上記第１及び第２の従
来の技術においては、螺旋状に巻回された薄平板同士の
間を埋めるように薄波板を介在させることから、長大な
薄波板を必要とし、その吸音体及び消音器の重量が重く
なる上にコストが嵩む問題がある。In the first and second prior arts described above, a thin corrugated sheet is interposed so as to fill the gap between the spirally wound thin flat plates. , The weight of the sound absorber and the silencer increases, and the cost increases.
【０００４】また、上記第３の従来の技術においては、
その螺旋状の板端面に端板を確実に固定して両板端面を
確実に閉塞することが困難で、製造困難な問題がある。
更に、上記従来のように構成材を螺旋状に巻回するもの
においては、吸音体の径方向断面が円形でないと螺旋体
を形成し難く、異形断面の吸音体に適用し難い問題があ
る。[0004] In the third prior art,
There is a problem that it is difficult to securely fix the end plates to the spiral plate end surfaces and securely close both plate end surfaces, which makes production difficult.
Further, in the conventional structure in which the component is spirally wound, the spiral body is difficult to form unless the cross section in the radial direction of the sound absorber is circular, and there is a problem that the sound absorber is difficult to be applied to the sound absorber having a modified cross section.
【０００５】そこで本発明は、上記の各問題を解決する
ことができる吸音体及びこれを用いた消音器を提供する
ことを目的とするものである。Accordingly, an object of the present invention is to provide a sound absorber capable of solving the above-mentioned problems and a muffler using the same.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めに、請求項１記載の発明は、径が異なり長さが略等し
い複数の筒状体（２〜６）に各々多数の小孔（２ａ〜６
ａ）を形成するとともに、これら筒状体（２〜６）の端
面を揃えて同心状に配してその内外層の筒状体間に消音
空間（１２ａ〜１２ｄ）を設け、上記各消音空間（１２
ａ〜１２ｄ）の両端部を端板（９，１０，１３，１４，
１５）にて閉塞したことを特徴とする吸音体である。In order to solve the above-mentioned problems, according to the present invention, a plurality of small holes are provided in a plurality of cylindrical bodies (2 to 6) having different diameters and substantially equal lengths. (2a-6
a), the end faces of these tubular bodies (2 to 6) are aligned and concentrically arranged, and silencing spaces (12a to 12d) are provided between the inner and outer layers of the tubular bodies. (12
a to 12d) with end plates (9, 10, 13, 14,
15) A sound absorber closed at 15).
【０００７】本発明においては、例えば自動車の排気音
を消音する場合に、最内層の筒状体（２）内に排気ガス
を導入すると、その排気ガス自体は筒状体（２）内を流
れて下流に吐出されるが、その排気音のエネルギーは、
その小孔（２ａ）から外部に形成された消音空間（１２
ａ）内に放出され、該消音空間（１２ａ）で拡張消音さ
れるとともに、外層の筒状体（３）に当たってそのエネ
ルギーが吸収される。更にその消音空間（１２ａ）内の
排気音はその外層の筒状体（３）の小孔（３ａ）からそ
の外部の消音空間（１２ｂ）に放出される。更に上記の
流れを繰り返して拡張消音による排気脈動の低減と小孔
の通過抵抗による排気エネルギーの減衰効果が高周波音
を消音する。In the present invention, when exhaust gas is introduced into the innermost cylindrical body (2), for example, to muffle the exhaust sound of an automobile, the exhaust gas itself flows through the cylindrical body (2). Is discharged downstream, but the energy of the exhaust sound is
A silencing space (12) formed outside from the small hole (2a).
a), the sound is expanded and silenced in the silencing space (12a), and the energy is absorbed by hitting the outer cylindrical body (3). Further, the exhaust sound in the silencing space (12a) is emitted from the small holes (3a) of the outer cylindrical body (3) to the silencing space (12b) outside. Further, by repeating the above flow, the reduction of the exhaust pulsation due to the extended silencing and the attenuation effect of the exhaust energy by the passage resistance of the small holes silence the high frequency sound.
【０００８】請求項２記載の発明は、上記端板を、筒状
体（２）〜（６）同士の間に介在されたスペーサ（９）
（１０）（１３）（１５）で形成した吸音体である。請
求項３の発明は、上記各端板を、その内外層に位置する
筒状体（２）〜（６）のいずれか一方に溶接固定し、他
方とは摺動可能にした吸音体である。According to a second aspect of the present invention, the end plate is provided with a spacer (9) interposed between the cylindrical bodies (2) to (6).
(10) A sound absorber formed by (13) and (15). The invention according to claim 3 is a sound absorber in which each of the end plates is welded and fixed to one of the tubular bodies (2) to (6) located in the inner and outer layers, and slidable with the other. .
【０００９】請求項４記載の発明は、上記の端板を、各
筒状体（２）〜（６）の端面に当接して各消音空間（１
２ａ）〜（１２ｄ）を閉塞する１枚の板（１４）で形成
した吸音体である。According to a fourth aspect of the present invention, the end plate is brought into contact with an end face of each of the tubular bodies (2) to (6) so that each of the sound deadening spaces (1) is formed.
This is a sound absorber formed of one plate (14) for closing 2a) to (12d).
【００１０】請求項５記載の発明は、径が異なり長さが
略等しい複数の筒状体（２〜６）に各々多数の小孔（２
ａ〜６ａ）を形成するとともに、これら筒状体（２〜
６）の端面を揃えて同心状に配してその内外層の筒状体
間に消音空間（１２ａ〜１２ｄ）を設け、上記各消音空
間（１２ａ〜１２ｄ）の両端部を端板（９，１０，１
３，１４，１５）にて閉塞して吸音体（１）を形成し、
該吸音体（１）を、多数の小孔（１７ａ）（２２ａ）を
有する排気管（１７）（２２）の外周に嵌着し、該吸音
体（１）の外部を容器で囲んでなる消音器である。According to a fifth aspect of the present invention, a large number of small holes (2) are formed in a plurality of cylindrical bodies (2 to 6) having different diameters and substantially equal lengths.
a to 6a) and these cylindrical bodies (2 to 6a)
6) The end faces of 6) are arranged concentrically and concentrically arranged to provide sound deadening spaces (12a to 12d) between the inner and outer layers of the cylindrical body, and both ends of the sound deadening spaces (12a to 12d) are connected to end plates (9, 12). 10,1
3, 14, 15) to form a sound absorbing body (1),
The sound absorber (1) is fitted around the outer circumference of an exhaust pipe (17) (22) having a large number of small holes (17a) (22a), and the sound absorber (1) is surrounded by a container. It is a vessel.
【００１１】本発明によれば、例えば自動車の排気音を
消音する消音器の排気管に吸音体（１）を嵌合装着した
場合、排気管（１７）（２２）内の排気音は、排気管
（１７）（２２）の小孔（１７ａ）（２２ａ）から吸音
体（１）内に放出され、その吸音体（１）内で上記のよ
うに消音される。According to the present invention, for example, when the sound absorbing body (1) is fitted and mounted on the exhaust pipe of a muffler for muffling the exhaust sound of an automobile, the exhaust noise in the exhaust pipes (17) and (22) is reduced. The sound is released from the small holes (17a) and (22a) of the pipes (17) and (22) into the sound absorber (1), and is muffled in the sound absorber (1) as described above.
【００１２】請求項６記載の発明は、請求項５記載の発
明における排気管が消音器のインレットパイプ（２２）
であるとともに、該インレットパイプ（２２）の後端を
閉塞した消音器である。According to a sixth aspect of the present invention, there is provided the exhaust pipe according to the fifth aspect, wherein the exhaust pipe is an inlet pipe of a muffler.
And a silencer having a closed rear end of the inlet pipe (22).
【００１３】本発明によれば、インレットパイプ（２
２）内に導入した排気ガス自体もその小孔（２２ａ）か
ら吸音体（１）内に放出され、上記よりも一層吸音体
（１）内で消音されるとともに、吸音体（１）内でガス
の拡散作用もされるので、消音に加えてガス流自体のエ
ネルギーも減衰される。そのため、インレットパイプか
らインナプレート間の消音室に排気ガスを放出するメイ
ンマフラにおいて、インレットパイプから放出された排
気ガスがインナプレートを加振することを抑制し、放射
音の発生を抑制する。According to the present invention, the inlet pipe (2
The exhaust gas itself introduced into 2) is also released into the sound absorber 1 from the small holes 22a, and is further silenced in the sound absorber 1 than in the above, and is further reduced in the sound absorber 1 Since the gas is also diffused, the energy of the gas flow itself is attenuated in addition to the noise reduction. Therefore, in the main muffler that discharges the exhaust gas from the inlet pipe to the muffling chamber between the inner plates, the exhaust gas discharged from the inlet pipe suppresses the excitation of the inner plate, thereby suppressing the generation of radiation noise.
【００１４】請求項７記載の発明は、上記請求項５又は
６記載の発明において、端板を、筒状体同士の間に介在
されたスペーサ（９）（１０）（１３）（１５）で形成
した消音器である。According to a seventh aspect of the present invention, in the fifth or sixth aspect of the present invention, the end plate is provided by spacers (9) (10) (13) (15) interposed between the cylindrical bodies. It is a formed silencer.
【００１５】請求項８記載の発明は、上記請求項５又は
６又は７記載の各端板を、その内外層に位置する筒状体
（２）〜（６）のいずれか一方に溶接固定し、他方とは
摺動可能にした消音器である。According to an eighth aspect of the present invention, each of the end plates according to the fifth, sixth, or seventh aspect is welded and fixed to one of the tubular bodies (2) to (6) located on the inner and outer layers. And the other is a silencer that is slidable.
【００１６】請求項９記載の発明は、上記請求項５又は
６記載の発明において、端板を、各筒状体（２〜６）の
端面に当接して各消音空間（１２ａ〜１２ｄ）を閉塞す
る１枚の板（１４）で形成した消音器である。According to a ninth aspect of the present invention, in the fifth or sixth aspect of the present invention, the end plates abut against the end surfaces of the cylindrical bodies (2 to 6) to form the respective silencing spaces (12a to 12d). This is a silencer formed by a single plate (14) to be closed.
【００１７】[0017]
【発明の実施の形態】図に示す実施例に基づいて本発明
の実施の形態について説明する。図１乃至図４は吸音体
の第１実施例を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in the drawings. 1 to 4 show a first embodiment of the sound absorber.
【００１８】１は吸音体で、直径が異なり軸方向の長さ
が等しいか略等しい複数の筒状体２〜６に各々多数の小
孔２ａ〜６ａを形成するとともに、これら筒状体２〜６
の端面を揃えて同心状に配し、かつ、各筒状体２〜６の
相互間の両端部に断面コ字状のスペーサからなる端板
９，１０を嵌合するとともに該端板９，１０を夫々その
内外に重合する筒状体２〜６にスポット溶接Ｗで固定し
て、上記各筒状体２〜６を一体化して形成されている。Reference numeral 1 denotes a sound absorber, which has a plurality of small holes 2a to 6a formed in a plurality of cylindrical bodies 2 to 6 having different diameters and equal or substantially equal in axial length. 6
The end plates 9 and 10 made of a spacer having a U-shaped cross section are fitted to both ends of each of the cylindrical bodies 2 to 6 so as to be fitted concentrically and the end plates 9 and 10 are fitted together. Each of the cylindrical bodies 2 to 6 is integrally formed by fixing the cylindrical bodies 2 to 6 by spot welding W to the inside and outside of the cylindrical bodies 2 to 6, respectively.
【００１９】上記各筒状体２〜６の小孔２ａ〜６ａは、
各筒状体２〜６の表裏方向に貫通して形成され、かつそ
の形成位置は消音に最適な位置に設定するもので、図の
実施例においては、内層の筒状体２〜６の小孔２ａ〜５
ａがその外層の筒状体３〜６の無孔部１１に対向する位
置に形成している。すなわち、下層の筒状体の小孔がそ
の上層の小孔に対し、筒状体の軸方向（図１参照）及び
周方向（図２参照）に位相して形成されている。The small holes 2a to 6a of the cylindrical bodies 2 to 6 are
Each of the cylindrical bodies 2 to 6 is formed so as to penetrate in the front and back directions, and the formation position is set to a position optimal for sound reduction. In the embodiment shown in FIG. Holes 2a-5
a is formed at a position facing the non-porous portion 11 of the cylindrical body 3 to 6 of the outer layer. That is, the small holes of the lower cylindrical body are formed in phase with the small holes of the upper layer in the axial direction (see FIG. 1) and the circumferential direction (see FIG. 2) of the cylindrical body.
【００２０】また、図１乃至図４の実施例では、各筒状
体２〜６を円筒に形成するとともに各筒状体２〜６の直
径を、これらの間に拡張消音に最適な消音空間１２ａ〜
１２ｄが形成されるように設定している。また、該各筒
状体２〜６は多孔金属平板、所謂パンチングプレートを
筒状に巻いてその巻端相互を溶接固着して形成されてい
る。In the embodiment shown in FIGS. 1 to 4, each of the cylindrical bodies 2 to 6 is formed in a cylindrical shape, and the diameter of each of the cylindrical bodies 2 to 6 is set between the cylindrical bodies 2 to 6 so as to be optimal for the noise reduction space. 12a-
12d is formed. Each of the cylindrical bodies 2 to 6 is formed by winding a perforated metal flat plate, a so-called punching plate, into a cylindrical shape and welding and fixing the winding ends to each other.
【００２１】上記端板９，１０は、上記消音空間１２ａ
〜１２ｄに嵌合する断面コ字状で図４に示すような無端
リング状に形成されており、直径の異なる上記各環状の
消音空間１２ａ〜１２ｄに対応する直径の異なるものを
複数用意して、各々の消音空間１２ａ〜１２ｄの両端に
嵌合してその両端を塞いでいる。The end plates 9, 10 are connected to the sound deadening space 12a.
4 are formed in an endless ring shape as shown in FIG. 4, and a plurality of different diameters corresponding to the respective annular silencing spaces 12a to 12d having different diameters are prepared. , Are fitted to both ends of each of the silencing spaces 12a to 12d to close the both ends.
【００２２】図５乃至図７は第２実施例を示すもので、
上記断面コ字状の端板９，１０の代わりに、径方向の断
面が矩形のＣリング状のスペーサ１３により端板を形成
したものである。そして、上記実施例と同様に、直径の
異なる各環状の消音空間１２ａ〜１２ｄに対応する直径
の異なるものを複数用意して、各々の消音空間１２ａ〜
１２ｄの両端に嵌合するとともにその内外に重合する筒
状体２〜６に点溶接Ｗで固定してその両端を塞いでい
る。FIGS. 5 to 7 show a second embodiment.
Instead of the end plates 9 and 10 having the U-shaped cross section, the end plates are formed by C-shaped spacers 13 having a rectangular cross section in the radial direction. Then, similarly to the above-described embodiment, a plurality of annular silencing spaces 12a to 12d having different diameters corresponding to the respective annular silencing spaces 12a to 12d are prepared.
Both ends of 12d are fitted and fixed to the cylindrical bodies 2 to 6 that overlap inside and outside by spot welding W to close both ends.
【００２３】図８は第３実施例を示すもので、上記図１
乃至図４に示す第１実施例における夫々の端板９を、そ
の内層又は外層に重合する筒状体２〜６のいずれか一方
に点溶接Ｗで固定して、各端板９部における内外層の筒
状体２〜６が相対的に軸方向へスライドできるようにし
たものである。FIG. 8 shows a third embodiment.
Each of the end plates 9 in the first embodiment shown in FIG. 4 is fixed to one of the cylindrical bodies 2 to 6 superposed on the inner layer or the outer layer thereof by spot welding W, and the inner and outer ends of each end plate 9 are formed. The cylindrical bodies 2 to 6 of the layers are relatively slidable in the axial direction.
【００２４】この溶接Ｗは、図８に示すように、内層の
筒状体２から外層の筒状体６に向かって、左右交互に行
うとよい。本実施例によれば、この吸音体をエンジンの
排気系に使用した場合において、内層から外層に至るに
つれて排気温が低下することにより、内外層の筒状体２
〜６間に熱膨張差が生じた場合に、内外層の筒状体２〜
６が相対的に軸方向及び周方向にスライドし、熱応力を
吸収して吸音体の破損を防止する。As shown in FIG. 8, this welding W is preferably performed alternately from left to right from the inner layer cylindrical body 2 to the outer layer cylindrical body 6. According to this embodiment, when this sound absorber is used in the exhaust system of an engine, the exhaust gas temperature decreases from the inner layer to the outer layer.
When there is a difference in thermal expansion between the inner and outer layers,
6 relatively slides in the axial direction and the circumferential direction, absorbs thermal stress and prevents breakage of the sound absorber.
【００２５】尚、上記図５乃至図７に示す第２実施例の
端板１３においても、本第３実施例のように内外層の２
〜６のいずれか一方に点溶接してもよい。図９及び図１
０は上記端板９，１０，１３の代わりに、１枚板の端板
１４としたものである。すなわち、上記のように層状に
嵌合した筒状体２〜６の半径方向に対する断面形状を、
その外側の谷部面１４ａに上記各筒状体２〜６の端部が
嵌合する蛇腹状に折曲形成し、かつこの断面形状で、最
内層の筒状体２の軸心を中心とする環状に形成したもの
である。The end plate 13 of the second embodiment shown in FIGS. 5 to 7 also has two inner and outer layers as in the third embodiment.
6 may be spot-welded. 9 and 1
Numeral 0 designates a single end plate 14 instead of the end plates 9, 10, 13. That is, the cross-sectional shape in the radial direction of the cylindrical bodies 2 to 6 fitted in layers as described above,
The end of each of the cylindrical bodies 2 to 6 is bent and formed into a bellows shape in which the end of each of the cylindrical bodies 2 to 6 is fitted to the outer valley surface 14a, and this cross-sectional shape is centered on the axis of the innermost cylindrical body 2. It is formed in an annular shape.
【００２６】本実施例によれば、端板１４の蛇腹形状を
所定に形成することにより、該端板１４を各筒状体２〜
６の端部に嵌合するのみで、各筒状体２〜６を、所定の
消音空間１２ａ〜１２ｄをもって配置できる。また、本
第４実施例によれば、上記第１，第２，第３実施例のよ
うに各消音空間１２ａ〜１２ｄ毎にスペーサ状の端板
９，１０，１３を配置するものに比べて使用端板の種類
と数が少なくなり、組付作業が容易になるとともに端板
の管理も容易になる。According to this embodiment, the end plate 14 is formed in a predetermined shape so that the end plate 14 is formed into a cylindrical shape.
The cylindrical bodies 2 to 6 can be arranged with predetermined silencing spaces 12a to 12d only by fitting to the end of the cylindrical body 6. Further, according to the fourth embodiment, as compared with the first, second, and third embodiments in which the spacer-like end plates 9, 10, and 13 are arranged for each of the noise-reducing spaces 12a to 12d. The type and number of used end plates are reduced, so that the assembling work is facilitated and the end plates are easily managed.
【００２７】図１１は第５実施例を示す。本第５実施例
は、各筒状体２〜６の軸方向の両端部において、その筒
状体に成形する以前の平板基板２′〜６′の表裏面の一
方に、平板状のスペーサからなる端板１５を軸心１６と
直交する径方向に配置して溶接固定し、この平板基板
２′〜６′と端板１５を軸心１６を中心として巻回して
筒状体２〜６を形成するようにしたものである。そし
て、このような径の異なる筒状体２〜６を、内外層の筒
状体２〜６間に上記の端板１５が密着介在するようにし
て図５のように嵌合し、他方の筒状体に点溶接Ｗで固定
して消音体１を構成する。FIG. 11 shows a fifth embodiment. In the fifth embodiment, at both ends in the axial direction of each of the cylindrical bodies 2 to 6, one of the front and back surfaces of the flat substrate 2 'to 6' before being formed into the cylindrical body is provided with a flat spacer. The end plate 15 is disposed in the radial direction perpendicular to the axis 16 and fixed by welding. The flat substrates 2 'to 6' and the end plate 15 are wound around the axis 16 to form the cylindrical bodies 2 to 6. It is to be formed. Then, the cylindrical bodies 2 to 6 having different diameters are fitted as shown in FIG. 5 so that the end plate 15 is closely interposed between the cylindrical bodies 2 to 6 of the inner and outer layers. The silencer 1 is fixed to the cylindrical body by spot welding W.
【００２８】図１２は上記図１〜図４に示す第１実施例
のように構成された消音体１を自動車の排気系に組み付
けられるサブマフラに適用した実施例である。すなわ
ち、サブマフラを構成する有孔インナパイプ１７の外周
に上記の消音体１の最内層の筒状体２を、上記と同様の
端板９，１０を介して嵌合固着し、その消音体１の外周
部を、消音空間１８を有してアウタシェル１９で囲み、
更に消音体１の両端外側を消音空間２０を有してアウタ
プレート２１で閉塞したものである。このアウタシェル
１９とアウタプレート２１が吸音体１の容器となってい
る。FIG. 12 shows an embodiment in which the silencer 1 constructed as in the first embodiment shown in FIGS. 1 to 4 is applied to a sub-muffler to be mounted on an exhaust system of an automobile. That is, the cylindrical body 2 of the innermost layer of the silencer 1 is fitted and fixed to the outer periphery of the perforated inner pipe 17 constituting the sub-muffler via the same end plates 9 and 10 as described above. Is surrounded by an outer shell 19 having a sound deadening space 18,
Further, the outer sides of both ends of the muffler 1 have a muffling space 20 and are closed by an outer plate 21. The outer shell 19 and the outer plate 21 constitute a container of the sound absorber 1.
【００２９】上記の構成において、排気ガスがインナパ
イプ１７内に流入すると、その排気音は、インナパイプ
１７の小孔１７ａから放出され、消音体１における最内
層の筒状体２の小孔２ａを通じて図１に示すように第１
の消音空間１２ａ内に流出する。この流出時において、
第１の消音空間１２ａ内に拡散されて拡張消音されると
同時に、第２の筒状体３に排気ガス流が当り、そのエネ
ルギーが第２の筒状体３で吸収され、排気ガスのもつエ
ネルギーが低減する。In the above configuration, when exhaust gas flows into the inner pipe 17, the exhaust sound is emitted from the small holes 17a of the inner pipe 17, and the small holes 2a of the innermost cylindrical body 2 in the silencer 1 are formed. Through the first as shown in FIG.
Out into the silencing space 12a. At the time of this outflow,
At the same time as the diffused sound is diffused in the first silencing space 12a and expanded and silenced, the exhaust gas flow impinges on the second cylindrical body 3, and its energy is absorbed by the second cylindrical body 3 and the exhaust gas has Energy is reduced.
【００３０】そして、第２の筒状体３の小孔３ａから流
出した排気音が第２の消音空間１２ｂ内で上記と同様に
拡張消音されると同時に排気ガスのエネルギーが第３の
筒状体４で吸収され、更に第３の筒状体４の小孔４ａ→
第３の消音空間１２ｃ→第４の筒状体５の小孔５ａ→第
４の消音空間１２ｄ→第５の筒状体６の小孔６ａを通過
する毎に拡張消音とエネルギーの吸収が繰り返されて最
外層の筒状体６から消音体１外の消音空間１８及び２０
に流出する。The exhaust sound flowing out of the small hole 3a of the second cylindrical body 3 is expanded and silenced in the second silencing space 12b in the same manner as described above, and at the same time the energy of the exhaust gas is reduced to the third cylindrical shape. Absorbed by the body 4, and furthermore, the small holes 4a of the third cylindrical body 4 →
The extended silencing and energy absorption are repeated each time the third silencing space 12c → the small hole 5a of the fourth cylindrical body 5 → the fourth silencing space 12d → the small hole 6a of the fifth cylindrical body 6 passes. From the outermost cylindrical body 6 to the silencer spaces 18 and 20 outside the silencer 1
Leaked to
【００３１】上記の繰り返しの拡張消音による排気脈動
の低減が衝撃音を抑え、小孔による排気ガスの整流効果
が高周波音を消音する。また、最外層の筒状体６の外部
に設けられた消音空間１８，２０も拡張室として有効に
作用する。The reduction of exhaust pulsation due to the above-described repeated extended silencing suppresses the impact noise, and the rectifying effect of the exhaust gas by the small holes silences high frequency noise. The silencing spaces 18 and 20 provided outside the outermost cylindrical body 6 also effectively function as expansion chambers.
【００３２】上記図１２は、上記図１〜図４に示す消音
体１を使用した例であるが、図５〜図８に示す端板１３
を使用した消音体１や、図９及び図１０に示す１枚状の
端板１４を使用した消音体１、更には図１１に示す筒状
体を使用した消音体１を、上記図１２に示すようにイン
ナパイプ１７の外周に固設してサブマフラを構成しても
よく、これによっても上記図１２で説明したと同様の作
用、効果を発揮する。FIG. 12 shows an example in which the muffler 1 shown in FIGS. 1 to 4 is used, but the end plate 13 shown in FIGS.
FIG. 12 shows a muffler 1 using a single end plate 14 shown in FIGS. 9 and 10 and a muffler 1 using a tubular body shown in FIG. As shown, a sub-muffler may be fixed to the outer periphery of the inner pipe 17, and the same operation and effect as described with reference to FIG.
【００３３】図１３は上記図１〜図４に示す第１実施例
のように構成された消音体１を自動車の排気系に組み付
けられるメインマフラに適用した実施例である。すなわ
ち、メインマフラを構成するインレットパイプ２２にお
けるメインマフラ内の部分に小孔２２ａを形成し、該小
孔形成部分の外周に上記図１〜図４に示す第１実施例の
消音体１における最内層の筒状体２を、上記の端板９，
１０を介して嵌合固着したものである。FIG. 13 shows an embodiment in which the silencer 1 constructed as in the first embodiment shown in FIGS. 1 to 4 is applied to a main muffler to be mounted on an exhaust system of an automobile. That is, a small hole 22a is formed in a portion inside the main muffler of the inlet pipe 22 constituting the main muffler, and the outer periphery of the small hole forming portion is provided in the muffler 1 of the first embodiment shown in FIGS. The inner layer tubular body 2 is connected to the end plate 9,
10 and fitted and fixed.
【００３４】図１３において、上記インレットパイプ２
２の後端は栓２３で閉塞されている。メインマフラはア
ウタシェル２４とアウタプレート２５及びインナプレー
ト２６，２７で第１室２８、第２室２９及び第３室３０
に区画され、上記インレットパイプ２２は、その有孔部
が第２室２９部に位置するように配置固定されている。
また、上記の消音体１は主として第２室２９部に位置し
て配置固定されている。３１は第１室２８と第２室２９
を連通する第１のインナパイプ、３２は第２室２９と第
３室３０を連通する第２のインナパイプ、３３は第３室
３０内の排気ガスを外部へ排出するアウトレットパイプ
である。In FIG. 13, the inlet pipe 2
The rear end of 2 is closed with a stopper 23. The main muffler includes an outer shell 24, an outer plate 25, and inner plates 26 and 27, a first chamber 28, a second chamber 29, and a third chamber 30.
The inlet pipe 22 is disposed and fixed such that its perforated portion is located in the second chamber 29.
The silencer 1 is located and fixed mainly at the second chamber 29. 31 is a first room 28 and a second room 29
Is a second inner pipe that communicates the second chamber 29 and the third chamber 30, and 33 is an outlet pipe that discharges exhaust gas in the third chamber 30 to the outside.
【００３５】このように構成されたメインマフラにおい
て、インレットパイプ２２内に導入された排気音は、イ
ンレットパイプ２２に形成した小孔２２ａから消音体１
内へ入り、上記図１２の説明と同様に流れて拡張消音さ
れる。また、消音体１内でガスの拡散作用が行われるた
め、消音体１から放出された排気ガスがインナプレート
２６，２７を加振することを抑制し、インナプレート２
６，２７の振動により発生する放射音を抑制する。In the main muffler thus configured, the exhaust noise introduced into the inlet pipe 22 is transmitted through the small holes 22 a formed in the inlet pipe 22.
Then, the sound flows in the same manner as described with reference to FIG. Further, since the gas diffusion action is performed in the silencer 1, the exhaust gas released from the silencer 1 is prevented from vibrating the inner plates 26 and 27, and the inner plate 2
The radiated sound generated by the vibration of 6, 27 is suppressed.
【００３６】そして、消音体１から第１室２８、第２室
２９、第３室３０に流出するときに更に拡張消音され、
排気ガスは、第１のインナパイプ３１、第２のインナパ
イプ３２を経てアウトレットパイプ３３より器外へ排出
される。When the sound flows from the silencer 1 to the first chamber 28, the second chamber 29, and the third chamber 30, the sound is further expanded and silenced.
The exhaust gas is discharged from the outlet pipe 33 to the outside through the first inner pipe 31 and the second inner pipe 32.
【００３７】上記図１３は、上記図１〜図４に示す消音
体１を使用した例であるが、図５〜図８に示す端板１３
を使用した消音体１や、図９及び図１０に示す端板１４
を使用した消音体１、更には図１１に示す筒状体を使用
した消音体１を、上記図１３に示すようにインレットパ
イプ２２の外周に固設してメインマフラを構成してもよ
く、これによっても上記図１３で説明したと同様の作
用、効果を発揮する。FIG. 13 shows an example in which the muffler 1 shown in FIGS. 1 to 4 is used, but the end plate 13 shown in FIGS.
And the end plate 14 shown in FIGS. 9 and 10.
The muffler 1 using the above and the muffler 1 using the tubular body shown in FIG. 11 may be fixed to the outer periphery of the inlet pipe 22 as shown in FIG. 13 to constitute a main muffler. In this case, the same operation and effect as described with reference to FIG.
【００３８】尚、上記の消音体１の各筒状体２〜６は、
上記実施例のような真円断面に限る必要はなく、楕円断
面や角断面等の異形断面でもよい。また、各筒状体２〜
６の小孔２ａ〜６ａの形成位置は、所望に設定するもの
であるが、上記各実施例のように、上下層の筒状体との
小孔同士が位相しているのが望ましい。更に各小孔２ａ
〜６ａの孔径は所望に設定するが、一般的には数十μｍ
〜数ｍｍが望ましい。The cylindrical bodies 2 to 6 of the silencer 1 are:
It is not necessary to limit the cross section to a perfect circular cross section as in the above embodiment, and an irregular cross section such as an elliptical cross section or a square cross section may be used. In addition, each cylindrical body 2
The formation positions of the six small holes 2a to 6a are set as desired, but it is desirable that the small holes in the upper and lower layer cylindrical bodies are in phase with each other as in the above-described embodiments. Furthermore, each small hole 2a
The hole diameter of ~ 6a is set as desired, but is generally several tens μm.
~ Several mm is desirable.
【００３９】また、筒状体２〜６の板厚は所望に設定す
るが、一般的には、数十μｍ〜数ｍｍが望ましい。更
に、筒状体２〜６と端板９，１０，１３，１４，１５の
固定は、スポット溶接、アーク溶接等の溶接や、塑性変
形によるかしめ固着や、更には接着剤や螺着等、所望の
方法によって固定するものである。The plate thickness of the cylindrical bodies 2 to 6 is set as desired, but is generally preferably several tens μm to several mm. Further, the cylindrical bodies 2 to 6 and the end plates 9, 10, 13, 14, 15 are fixed by welding such as spot welding, arc welding, caulking and fixing by plastic deformation, and furthermore, adhesive or screwing. It is fixed by a desired method.
【００４０】[0040]
【発明の効果】以上のようであるから、請求項１乃至４
の発明によれば、各消音空間の存在によって有効に消音
できる上に、この吸音体を製造するには、多数の小孔を
有する平板（所謂パンチングプレート）を巻いて筒状体
を作り、その径の異なる筒状体を同心状に嵌合配置し、
その両端部に端板を閉塞固定すればよいため、前記従来
のような波板を使用するものに比べて使用材料が最小限
で済み、コスト低減、重量低減を図り得る。As described above, claims 1 to 4 have been described.
According to the invention, in addition to being able to effectively muffle sound due to the existence of each muffling space, in order to manufacture this sound absorbing body, a flat plate having a large number of small holes (a so-called punching plate) is wound to form a cylindrical body, Tubular bodies with different diameters are fitted and arranged concentrically,
Since the end plates may be closed and fixed to both ends thereof, the material used is minimized as compared with the conventional one using a corrugated plate, and cost and weight can be reduced.
【００４１】更に、従来の螺旋状に巻回するものに比べ
て、筒状体間の消音空間の両端部を閉塞する作業が容易
でかつ確実に行え、製造の容易化を図りコスト低減を図
ることができる。Further, as compared with the conventional spirally wound type, the operation of closing both ends of the sound deadening space between the cylindrical bodies can be performed more easily and reliably, thereby facilitating the production and reducing the cost. be able to.
【００４２】また、断面異形の筒状体を容易に形成でき
るので、これを嵌合して形成する吸音体は、所望の異形
断面に容易に形成できる。請求項３記載の発明によれば
更に、吸音体をエンジンの排気系に使用した場合におい
て、内層から外層に至るにつれて排気温が低下すること
により、内外層の筒状体間に熱膨張差が生じた場合に、
内外層の筒状体が相対的に軸方向及び周方向にスライド
し、熱応力を吸収して吸音体の破損を防止できる。Further, since a cylindrical body having a modified cross section can be easily formed, a sound absorber formed by fitting the cylindrical body can be easily formed into a desired modified cross section. According to the third aspect of the present invention, when the sound absorbing body is used in an exhaust system of an engine, the temperature of the exhaust gas decreases from the inner layer to the outer layer, so that the thermal expansion difference between the cylindrical bodies of the inner and outer layers is reduced. If that happens,
The tubular body of the inner and outer layers relatively slides in the axial direction and the circumferential direction, absorbing thermal stress and preventing damage to the sound absorber.
【００４３】請求項５記載の発明及び請求項７及び請求
項９記載の発明によれば、上記の効果を有する消音器を
提供できる。請求項６記載の発明によれば、インナプレ
ートを有するメインマフラにおいて、上記の効果に加
え、更に、インレットパイプから放出される排気ガスが
インナプレートを加振することを抑制でき、放射音の発
生を抑制できる。According to the fifth and seventh and ninth aspects of the present invention, a muffler having the above-described effects can be provided. According to the invention described in claim 6, in the main muffler having the inner plate, in addition to the above effects, it is possible to further suppress the exhaust gas emitted from the inlet pipe from vibrating the inner plate, and to generate radiation noise. Can be suppressed.
【００４４】請求項８記載の発明によれば、更に上記請
求項３に記載した効果を有する消音器を提供できる。According to the eighth aspect of the present invention, it is possible to provide a muffler having the effect described in the third aspect.
【図１】本発明の吸音体の第１実施例を示す側断面図。FIG. 1 is a side sectional view showing a first embodiment of a sound absorber according to the present invention.
【図２】図１におけるＡ−Ａ線断面図。FIG. 2 is a sectional view taken along line AA in FIG.
【図３】図１のＢ部の拡大断面図。FIG. 3 is an enlarged sectional view of a portion B in FIG. 1;
【図４】図１の実施例における端板を示す斜視図。FIG. 4 is a perspective view showing an end plate in the embodiment of FIG. 1;
【図５】本発明の吸音体の第２実施例を示す要部の断面
図。FIG. 5 is a sectional view of a main part showing a second embodiment of the sound absorbing body of the present invention.
【図６】図５の実施例における端板の斜視図。FIG. 6 is a perspective view of an end plate in the embodiment of FIG. 5;
【図７】同正面図。FIG. 7 is a front view of the same.
【図８】本発明の吸音体の第３実施例を示す要部の断面
図。FIG. 8 is a sectional view of a main part showing a third embodiment of the sound absorbing body of the present invention.
【図９】本発明の吸音体の第４実施例を示す要部の断面
図。FIG. 9 is a sectional view of a main part showing a fourth embodiment of the sound absorbing body of the present invention.
【図１０】図９の実施例における吸音体の端面図。FIG. 10 is an end view of the sound absorber in the embodiment of FIG. 9;
【図１１】本発明の吸音体を形成する筒状体の他の例を
示すもので、平板状態の斜視図。FIG. 11 is a perspective view showing another example of the cylindrical body forming the sound absorbing body of the present invention, in a flat plate state.
【図１２】本発明の吸音体をサブマフラとしての消音器
に適用した実施例を示す消音器の断面図。FIG. 12 is a cross-sectional view of a muffler showing an embodiment in which the sound absorber of the present invention is applied to a muffler as a sub-muffler.
【図１３】本発明の吸音体をメインマフラとしての消音
器に適用した実施例を示す消音器の断面図。FIG. 13 is a sectional view of a muffler showing an embodiment in which the sound absorber of the present invention is applied to a muffler as a main muffler.
１…吸音体 ２〜６…筒状体 ２ａ〜６ａ…小孔 ９，１０，１３，１４，
１５…端板 １２ａ〜１２ｄ…消音空間 １７…排気管 １７ａ…小孔 ２２…排気管であるイン
レットパイプ ２２ａ…小孔DESCRIPTION OF SYMBOLS 1 ... Sound absorber 2-6 ... Cylindrical body 2a-6a ... Small hole 9,10,13,14,
15 End plate 12a to 12d Silencing space 17 Exhaust pipe 17a Small hole 22 Inlet pipe 22a as exhaust pipe 22a Small hole
Claims (9)
に各々多数の小孔を形成するとともに、これら筒状体の
端面を揃えて同心状に配してその内外層の筒状体間に消
音空間を設け、上記各消音空間の両端部を端板にて閉塞
したことを特徴とする吸音体。1. A large number of small holes are respectively formed in a plurality of cylindrical bodies having different diameters and substantially equal lengths, and end faces of the cylindrical bodies are aligned and concentrically arranged to form cylindrical inner and outer layers. A sound absorbing body, wherein a sound deadening space is provided between the bodies, and both ends of each sound deadening space are closed by end plates.
ペーサである請求項１記載の吸音体。2. The sound absorber according to claim 1, wherein the end plate is a spacer interposed between the cylindrical bodies.
のいずれか一方に溶接固定し、他方とは摺動可能にした
請求項１又は２記載の吸音体。3. The sound absorber according to claim 1, wherein each of the end plates is welded and fixed to one of the tubular members located on the inner and outer layers and slidable with the other.
音空間を閉塞する１枚の板からなる請求項１記載の吸音
体。4. The sound absorber according to claim 1, wherein the end plate is formed of a single plate that abuts an end surface of each tubular body to close each silencing space.
に各々多数の小孔を形成するとともに、これら筒状体の
端面を揃えて同心状に配してその内外層の筒状体間に消
音空間を設け、上記各消音空間の両端部を端板にて閉塞
して吸音体を形成し、該吸音体を、多数の小孔を有する
排気管の外周に嵌着し、該吸音体の外部を容器で囲んで
なる消音器。5. A large number of small holes are formed in a plurality of cylindrical bodies having different diameters and substantially equal lengths, and end faces of these cylindrical bodies are aligned and concentrically arranged to form cylindrical inner and outer layers. A sound-absorbing space is provided between the bodies, and both ends of each sound-absorbing space are closed with an end plate to form a sound-absorbing body, and the sound-absorbing body is fitted on the outer periphery of an exhaust pipe having a large number of small holes. A silencer that surrounds the outside of a sound absorber with a container.
るとともに、該インレットパイプの後端を閉塞した請求
項５記載の消音器。6. The muffler according to claim 5, wherein the exhaust pipe is an inlet pipe of a muffler, and a rear end of the inlet pipe is closed.
ペーサである請求項５又は６記載の消音器。7. The muffler according to claim 5, wherein the end plate is a spacer interposed between the cylindrical bodies.
のいずれか一方に溶接固定し、他方とは摺動可能にした
請求項５又は６又は７記載の消音器。8. The muffler according to claim 5, wherein each end plate is welded and fixed to one of the tubular bodies located on the inner and outer layers and slidable with the other.
音空間を閉塞する１枚の板からなる請求項５又は６記載
の消音器。9. The muffler according to claim 5, wherein the end plate is formed of a single plate that abuts on an end surface of each tubular body to close each muffling space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18904096A JPH1030426A (en) | 1996-07-18 | 1996-07-18 | Noise absorber and muffler using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18904096A JPH1030426A (en) | 1996-07-18 | 1996-07-18 | Noise absorber and muffler using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1030426A true JPH1030426A (en) | 1998-02-03 |
Family
ID=16234294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18904096A Withdrawn JPH1030426A (en) | 1996-07-18 | 1996-07-18 | Noise absorber and muffler using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1030426A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106321406A (en) * | 2016-11-01 | 2017-01-11 | 四川三元环境治理股份有限公司 | Evacuating silencer |
-
1996
- 1996-07-18 JP JP18904096A patent/JPH1030426A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106321406A (en) * | 2016-11-01 | 2017-01-11 | 四川三元环境治理股份有限公司 | Evacuating silencer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20031007 |