JP2014134180A - Silencer - Google Patents

Silencer Download PDF

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Publication number
JP2014134180A
JP2014134180A JP2013003714A JP2013003714A JP2014134180A JP 2014134180 A JP2014134180 A JP 2014134180A JP 2013003714 A JP2013003714 A JP 2013003714A JP 2013003714 A JP2013003714 A JP 2013003714A JP 2014134180 A JP2014134180 A JP 2014134180A
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Prior art keywords
tubular member
silencer
communication path
resonance chamber
resonance
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JP2013003714A
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JP6162407B2 (en
Inventor
Katsuhiko Kainuma
克彦 貝沼
Tomohiro Furuya
智大 古屋
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Futaba Industrial Co Ltd
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Futaba Industrial Co Ltd
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Priority to JP2013003714A priority Critical patent/JP6162407B2/en
Priority to US14/758,730 priority patent/US20150337699A1/en
Priority to CN201380069828.6A priority patent/CN104903556A/en
Priority to EP13871221.1A priority patent/EP2944783A4/en
Priority to PCT/JP2013/083960 priority patent/WO2014109192A1/en
Priority to CA2897138A priority patent/CA2897138A1/en
Publication of JP2014134180A publication Critical patent/JP2014134180A/en
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Publication of JP6162407B2 publication Critical patent/JP6162407B2/en
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    • 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
    • F01N1/023—Helmholtz resonators
    • 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
    • F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a silencer materializing a helmholtz type resonance system with a simple structure.SOLUTION: At a connecting portion between a first tubular member 10 and a second tubular member 20, a double tube portion in which an end portion of the first tubular member 10 is inserted inside from a tip end portion 23 of the second tubular member 20 is formed. The tip end portion 23 of the second tubular member 20 is joined with an outer peripheral surface of the first tubular member 10. A part forming the double tube portion in the second tubular member 20 is equipped with a body portion 22 close to a tip end of the first tubular member 10, and a diameter-expanding portion 21 which is a part close to the tip end of the second tubular member 20 and expanded in a diameter as compared with the body portion 22. Between the first tubular member 10 and the diameter-expanding portion 21, a resonance chamber 31 is formed, and between the first tubular member 10 and the body portion 22, a communication passage 32 for communicating an exhaust channel and the resonance chamber 31 is formed. A helmholtz type resonance system is configured by the resonance chamber 31 and the communication passage 32.

Description

本発明は、排気騒音を抑制するための消音器に関する。   The present invention relates to a silencer for suppressing exhaust noise.

自動車用の排気システムは、排気流路に設けられた消音器により排気騒音を抑制する。例えば、実長の長い管状部で発生する低周波の気柱共鳴音は排気こもり音を悪化させる要因となるため、メインマフラと直列にサブマフラを設けることで気柱共鳴音を低減するといった対策が講じられている。また、特許文献１には、メインマフラとサブマフラとの間に、サイドブランチ型共鳴系の消音器を設けた構成について記載されている。   The exhaust system for automobiles suppresses exhaust noise by a silencer provided in the exhaust passage. For example, low-frequency air column resonance generated in a long tubular section may cause deterioration of exhaust noise, so measures such as reducing the air column resonance by providing a sub-muffler in series with the main muffler. Has been taken. Patent Document 1 describes a configuration in which a side branch type resonance silencer is provided between a main muffler and a sub muffler.

特開２００５−１０５９１８号公報JP 2005-105918 A

ところで、共鳴系の消音器としては、前述したサイドブランチ型共鳴系の消音器の他に、ヘルムホルツ型共鳴系の消音器が知られている。しかしながら、ヘルムホルツ型の消音器は、細長い連通路を介して容積の大きい共鳴室へ至る構造によって実現されるため、構造が複雑になってしまうという問題があった。   Incidentally, as a resonance silencer, a Helmholtz resonance silencer is known in addition to the side branch resonance silencer described above. However, since the Helmholtz type silencer is realized by a structure that reaches a resonance chamber having a large volume via an elongated communication path, there is a problem that the structure becomes complicated.

本発明は、こうした問題に鑑みてなされたものであり、ヘルムホルツ型共鳴系を簡素な構造で実現する消音器を提供することを目的としている。   The present invention has been made in view of these problems, and an object thereof is to provide a silencer that realizes a Helmholtz resonance system with a simple structure.

本発明の消音器は、内燃機関の排気流路を形成する第１の管状部材と、前記第１の管状部材に接続され、前記第１の管状部材とともに前記排気流路を形成する第２の管状部材と、を備え、前記第１の管状部材の端部が前記第２の管状部材の端部から内側に挿入された二重管部が形成され、前記第２の管状部材の先端部は、前記第１の管状部材の外周面に接合され、前記第２の管状部材における前記二重管部を形成する部分は、前記第１の管状部材の先端寄りの第１の部分と、前記第２の管状部材の先端寄りの部分であって前記第１の部分と比較して径が拡大された第２の部分と、を備え、前記第１の管状部材と前記第２の部分との間には、共鳴室が形成され、前記第１の管状部材と前記第１の部分との間には、前記排気流路と前記共鳴室とを連通する連通路が形成され、前記共鳴室及び前記連通路によりヘルムホルツ型共鳴系が構成されている。   The silencer of the present invention includes a first tubular member that forms an exhaust passage of an internal combustion engine, and a second tubular member that is connected to the first tubular member and forms the exhaust passage together with the first tubular member. A tubular member, and a double tube portion is formed in which an end portion of the first tubular member is inserted inwardly from an end portion of the second tubular member, and a distal end portion of the second tubular member is The portion that is joined to the outer peripheral surface of the first tubular member and that forms the double tube portion of the second tubular member includes a first portion near the tip of the first tubular member, and the first tubular member. A second portion having a diameter larger than that of the first portion, the portion being close to the tip of the two tubular members, and between the first tubular member and the second portion Includes a resonance chamber, and the exhaust passage and the resonance chamber are provided between the first tubular member and the first portion. The communication passage is formed to be passing, Helmholtz resonance system is constituted by the resonance chamber and the communicating path.

このような構成によれば、第１の管状部材と第２の管状部材との接続部において、排気騒音を抑制することができる。また、排気流路を形成する２つの管状部材により二重管部が形成され、その二重管部を利用してヘルムホルツ型共鳴系の共鳴室及び連通路が形成されるため、ヘルムホルツ型共鳴系を簡素な構造で実現することができる。   According to such a configuration, exhaust noise can be suppressed at the connection portion between the first tubular member and the second tubular member. In addition, a double tube portion is formed by two tubular members forming the exhaust flow path, and a resonance chamber and a communication path of the Helmholtz resonance system are formed using the double tube portion. Can be realized with a simple structure.

また、上記構成において、前記連通路には、前記第１の管状部材と前記第２の管状部材との接触を防ぐためのスペーサが設けられ、前記スペーサは、前記連通路が塞がれないように、前記第１の管状部材の外周において通気路が確保されるように配置されていてもよい。このような構成によれば、連通路が塞がれにくくなる分、排気騒音を抑制する効果を高くすることができる。   In the above configuration, the communication path is provided with a spacer for preventing contact between the first tubular member and the second tubular member, and the spacer does not block the communication path. In addition, the air passage may be secured on the outer periphery of the first tubular member. According to such a configuration, the effect of suppressing the exhaust noise can be enhanced as much as the communication path is less likely to be blocked.

また、上記構成において、前記第１の管状部材及び前記第２の管状部材は、それぞれが単一の部品で形成されていてもよい。このような構成によれば、ヘルムホルツ型共鳴系を構成するために専用の部品を別途用いる必要がないため、省スペース化や低コスト化などを図ることができる。   In the above configuration, each of the first tubular member and the second tubular member may be formed of a single component. According to such a configuration, it is not necessary to separately use a dedicated component for configuring the Helmholtz resonance system, so that space saving and cost reduction can be achieved.

なお、本発明は、前述した消音器の他、消音器を備える排気システム、排気消音方法など、種々の形態で実現することができる。   In addition to the silencer described above, the present invention can be realized in various forms such as an exhaust system including a silencer and an exhaust silencer method.

実施形態の排気システムの平面図である。It is a top view of the exhaust system of an embodiment. 図１のII−II断面図である。It is II-II sectional drawing of FIG. （Ａ）は消音器の分解斜視図、（Ｂ）は消音器の透過斜視図である。(A) is an exploded perspective view of the silencer, (B) is a transparent perspective view of the silencer. 図２のIV−IV断面図である。It is IV-IV sectional drawing of FIG.

以下、本発明が適用された実施形態について、図面を用いて説明する。
図１に示す排気システム１は、自動車の内燃機関から排出された排ガスの流路となる排気流路を形成する。排気システム１は、実長の長い排気流路を形成する管状の流路部材２を中心に構成され、流路部材２（排気流路）に沿って、複数の構成要素３，４，５が直列に配置されている。具体的には、排気システム１は、排気流路の上流側（図１でいう左側）から順に、触媒コンバータ３と、サブマフラ４と、メインマフラ５と、を備える。 Embodiments to which the present invention is applied will be described below with reference to the drawings.
An exhaust system 1 shown in FIG. 1 forms an exhaust passage that serves as a passage for exhaust gas discharged from an internal combustion engine of an automobile. The exhaust system 1 is configured around a tubular flow channel member 2 that forms a long exhaust channel having a long actual length. They are arranged in series. Specifically, the exhaust system 1 includes a catalytic converter 3, a sub muffler 4, and a main muffler 5 in order from the upstream side (the left side in FIG. 1) of the exhaust flow path.

流路部材２におけるサブマフラ４とメインマフラ５とを接続する部分は、サブマフラ４の下流の排気流路を形成する第１の管状部材１０と、第１の管状部材１０における下流側の端部に接続され、メインマフラ５の上流の排気流路を形成する第２の管状部材２０と、を備える。   The portion of the flow path member 2 that connects the sub muffler 4 and the main muffler 5 is formed at the first tubular member 10 that forms the exhaust flow path downstream of the sub muffler 4 and the downstream end of the first tubular member 10. And a second tubular member 20 that forms an exhaust passage upstream of the main muffler 5.

図２、図３（Ａ）及び図３（Ｂ）に示すように、第１の管状部材１０は、外径Ｒ１（例えば６０．５ｍｍ）の円管部品を加工して形成された部材であり、単一の部品で構成されている。具体的には、第１の管状部材１０は、外径Ｒ１の円管部品において下流側（図２でいう右側）となる端部、具体的には先端から長さＬ１の部分が、外径Ｒ１よりも小さい外径Ｒ２（例えば５４．７ｍｍ）に縮径された部材である。なお、以下の説明では、第１の管状部材１０における先端から長さＬ１の部分を「縮径部１１」といい、残りの部分を「本体部１２」という。   As shown in FIGS. 2, 3A and 3B, the first tubular member 10 is a member formed by processing a circular pipe component having an outer diameter R1 (for example, 60.5 mm). Consists of a single part. Specifically, the first tubular member 10 has an outer diameter at an end portion on the downstream side (right side in FIG. 2), specifically, a portion having a length L1 from the distal end of the circular pipe component having an outer diameter R1. The member is reduced in diameter to an outer diameter R2 (for example, 54.7 mm) smaller than R1. In the following description, a portion of the first tubular member 10 having a length L1 from the tip is referred to as a “reduced diameter portion 11”, and the remaining portion is referred to as a “main body portion 12”.

第２の管状部材２０は、第１の管状部材１０と同様、外径Ｒ１の円管部品を加工して形成された部材であり、第１の管状部材１０と同様、単一の部品で構成されている。具体的には、第２の管状部材２０は、外径Ｒ１の円管部品において上流側（図２でいう左側）となる端部、具体的には先端から長さＬ２の部分が、外径Ｒ１よりも大きい外径に拡径された部材である。具体的には、先端から長さＬ２の位置から、先端側へ向かって、徐々に外径が大きくなり、先端から長さＬ３の位置（Ｌ３＜Ｌ２）で最も大きい外径（例えば１２０ｍｍ）となる。そして、先端から長さＬ４の位置（Ｌ４＜Ｌ３）の位置から、先端側へ向かって、徐々に外径が小さくなる。このような形状は、例えば、先端から長さＬ２の部分を拡径する加工を行った後、先端から長さＬ４の部分を縮径する加工を行うことにより、実現される。なお、以下の説明では、第２の管状部材２０における先端から長さＬ２の部分を「拡径部２１」といい、残りの部分を「本体部２２」という。   Similar to the first tubular member 10, the second tubular member 20 is a member formed by processing a circular pipe component having an outer diameter R1 and, like the first tubular member 10, is composed of a single component. Has been. Specifically, the second tubular member 20 has an outer diameter R1 having an end on the upstream side (left side in FIG. 2), specifically, a portion having a length L2 from the tip. The member is expanded to an outer diameter larger than R1. Specifically, the outer diameter gradually increases from the position of the length L2 from the tip toward the tip side, and the largest outer diameter (for example, 120 mm) at the position of the length L3 (L3 <L2) from the tip. Become. Then, the outer diameter gradually decreases from the position of the length L4 from the tip (L4 <L3) toward the tip. Such a shape is realized, for example, by performing a process of expanding the diameter L2 from the tip and then performing a process of reducing the length L4 from the tip. In the following description, the portion of the second tubular member 20 having a length L2 from the distal end is referred to as “expanded diameter portion 21”, and the remaining portion is referred to as “main body portion 22”.

第１の管状部材１０における下流側端部、具体的には縮径部１１の全体及び本体部１２の一部は、第２の管状部材２０における上流側端部（拡径部２１の先端部２３）から、第２の管状部材２０の内側に、中心軸が一致する形で挿入されている。これにより、第１の
管状部材１０と第２の管状部材２０との接続部（後述する接合箇所及びその近傍の部分）には、第１の管状部材１０を内管、第２の管状部材２０を外管、とする二重管部（第１の管状部材１０と第２の管状部材２０とがオーバーラップする部分）が形成されている。そして、以下に説明するように、第１の管状部材１０と第２の管状部材２０との接続部は、ヘルムホルツ型共鳴系の消音器３０として機能する。 The downstream end portion of the first tubular member 10, specifically, the entire reduced diameter portion 11 and a part of the main body portion 12 are the upstream end portion of the second tubular member 20 (the distal end portion of the enlarged diameter portion 21). 23) to the inside of the second tubular member 20 so that the central axes thereof coincide with each other. As a result, the first tubular member 10 is connected to the inner tube and the second tubular member 20 is connected to the connecting portion between the first tubular member 10 and the second tubular member 20 (joint location described below and a portion in the vicinity thereof). A double tube portion (a portion where the first tubular member 10 and the second tubular member 20 overlap) is formed. As will be described below, the connecting portion between the first tubular member 10 and the second tubular member 20 functions as a Helmholtz resonance silencer 30.

すなわち、第２の管状部材２０、具体的には拡径部２１の先端部２３は、第１の管状部材１０、具体的には本体部１２の外周面に接合（本実施形態では全周溶接）されている。これにより、二重管部において、第１の管状部材１０と第２の管状部材２０との間に、排気流路と連通する、行き止まりの空間が形成されている。具体的には、第１の管状部材１０の本体部１２と第２の管状部材２０の拡径部２１との間に、容積の大きい共鳴室３１が形成されている。換言すれば、共鳴室３１として必要な容積が、第２の管状部材２０の拡径部２１により確保されている。また、第１の管状部材１０の縮径部１１と第２の管状部材２０の本体部２２との間に、軸方向と垂直な断面積が共鳴室３１と比較して小さい空間であって、排気流路と共鳴室３１とを連通する連通路３２が形成されている。そして、これら共鳴室３１及び連通路３２は、ヘルムホルツ型共鳴系を構成する形状に設計されている。   That is, the second tubular member 20, specifically, the distal end portion 23 of the enlarged diameter portion 21 is joined to the outer peripheral surface of the first tubular member 10, specifically the main body portion 12 (in this embodiment, all-around welding). ) As a result, a dead-end space communicating with the exhaust flow path is formed between the first tubular member 10 and the second tubular member 20 in the double tube portion. Specifically, a resonance chamber 31 having a large volume is formed between the main body portion 12 of the first tubular member 10 and the enlarged diameter portion 21 of the second tubular member 20. In other words, a volume necessary for the resonance chamber 31 is ensured by the enlarged diameter portion 21 of the second tubular member 20. Further, a space between the reduced diameter portion 11 of the first tubular member 10 and the main body portion 22 of the second tubular member 20 is a space in which the cross-sectional area perpendicular to the axial direction is smaller than that of the resonance chamber 31, A communication path 32 that connects the exhaust passage and the resonance chamber 31 is formed. The resonance chamber 31 and the communication path 32 are designed in a shape that constitutes a Helmholtz resonance system.

また、連通路３２には、金属製の緩衝部材であるワイヤメッシュ４０が設けられている。ワイヤメッシュ４０は、第１の管状部材１０と第２の管状部材２０との接触を防ぐためのスペーサとして機能する。また、ワイヤメッシュ４０は、第１の管状部材１０と第２の管状部材２０との熱収縮差の応力を低減する機能も有する。なお、ワイヤメッシュ４０の外径は、第１の管状部材１０の本体部１２の外径Ｒ１以下である。   The communication path 32 is provided with a wire mesh 40 that is a metal buffer member. The wire mesh 40 functions as a spacer for preventing contact between the first tubular member 10 and the second tubular member 20. The wire mesh 40 also has a function of reducing the stress due to the difference in thermal shrinkage between the first tubular member 10 and the second tubular member 20. The outer diameter of the wire mesh 40 is equal to or smaller than the outer diameter R1 of the main body 12 of the first tubular member 10.

ただし、ワイヤメッシュ４０により連通路３２が塞がれると、共鳴現象を発生させる音圧の加振力が共鳴室３１へ伝達されにくくなってしまう。そこで、ワイヤメッシュ４０は、第１の管状部材１０の外周において通気路が確保されるように配置されている。具体的には、図４に示すように、本実施形態では、第１の管状部材１０の外周全周（３６０度の範囲）における一部に、第１の管状部材１０の外周面に沿った円弧状の複数（この例では３つ）のワイヤメッシュ４０が配置されている。３つのワイヤメッシュ４０は、すべてを合わせても第１の管状部材１０の外周全周に満たない長さであり、しかも、３つのワイヤメッシュ４０は、第１の管状部材１０の軸方向において、ずらして（軸方向において異なる位置に）配置されている（図２参照）。したがって、第１の管状部材１０の外周において通気路が良好に確保される。   However, if the communication path 32 is blocked by the wire mesh 40, the excitation force of the sound pressure that causes the resonance phenomenon is hardly transmitted to the resonance chamber 31. Therefore, the wire mesh 40 is disposed so that an air passage is secured on the outer periphery of the first tubular member 10. Specifically, as shown in FIG. 4, in the present embodiment, along the outer peripheral surface of the first tubular member 10, a part of the entire outer periphery of the first tubular member 10 (range of 360 degrees). A plurality of arcuate (three in this example) wire meshes 40 are arranged. The three wire meshes 40 have a length that is less than the entire outer circumference of the first tubular member 10 even if they are all combined, and the three wire meshes 40 are arranged in the axial direction of the first tubular member 10. They are shifted (at different positions in the axial direction) (see FIG. 2). Therefore, a good ventilation path is secured on the outer periphery of the first tubular member 10.

また、消音器３０は、共鳴周波数がパイプの気柱共鳴周波数のＮ次モード（Ｎは自然数であり、本実施形態では１。）に合致するように設計されており、第１の管状部材１０の先端がＮ次モードの最大音圧の位置となるように配置されている。   The silencer 30 is designed so that the resonance frequency matches the N-order mode (N is a natural number, 1 in the present embodiment) of the air column resonance frequency of the pipe. Are arranged so that the tip of the position is the position of the maximum sound pressure in the Nth order mode.

以上詳述した実施形態によれば、以下の効果が得られる。
［Ａ１］消音器３０は、内燃機関の排気流路を形成する第１の管状部材１０と、第１の管状部材１０に接続され、第１の管状部材１０とともに排気流路を形成する第２の管状部材２０と、を備える。第１の管状部材１０と第２の管状部材２０との接続部には、第１の管状部材１０の端部が第２の管状部材２０の先端部２３から内側に挿入された二重管部が形成されており、第２の管状部材２０の先端部２３は、第１の管状部材１０の外周面に接合されている。第２の管状部材２０における二重管部を形成する部分は、第１の管状部材１０の先端寄りの本体部２２と、第２の管状部材２０の先端寄りの部分であって本体部２２と比較して径が拡大された拡径部２１と、を備えている。第１の管状部材１０と拡径部２１との間には、共鳴室３１が形成され、第１の管状部材１０と本体部２２との間には、排気流路と共鳴室３１とを連通する連通路３２が形成されており、共鳴室３１及び連通路
３２によりヘルムホルツ型共鳴系が構成されている。 According to the embodiment detailed above, the following effects can be obtained.
[A1] The silencer 30 is connected to the first tubular member 10 that forms the exhaust passage of the internal combustion engine, and the second tubular member 10 that forms the exhaust passage together with the first tubular member 10. The tubular member 20 is provided. At the connection portion between the first tubular member 10 and the second tubular member 20, a double tube portion in which the end portion of the first tubular member 10 is inserted inward from the distal end portion 23 of the second tubular member 20. The tip 23 of the second tubular member 20 is joined to the outer peripheral surface of the first tubular member 10. The portions forming the double tube portion in the second tubular member 20 are the main body portion 22 near the tip of the first tubular member 10, and the portion near the tip of the second tubular member 20. And a diameter-expanded portion 21 whose diameter is increased in comparison. A resonance chamber 31 is formed between the first tubular member 10 and the enlarged diameter portion 21, and the exhaust passage and the resonance chamber 31 are communicated between the first tubular member 10 and the main body portion 22. A communication path 32 is formed, and the resonance chamber 31 and the communication path 32 constitute a Helmholtz resonance system.

したがって、本実施形態によれば、第１の管状部材１０と第２の管状部材２０との接続部において、気柱共鳴音を抑制することができ、その結果、排気騒音を抑制することができる。また、排気流路を形成する第１の管状部材１０及び第２の管状部材２０により二重管部が形成され、その二重管部を利用してヘルムホルツ型共鳴系の共鳴室３１及び連通路３２が形成されるため、ヘルムホルツ型共鳴系を簡素な構造で実現することができる。特に、ヘルムホルツ型共鳴系を採用しているため、共鳴室３１の容積を大きくすることで、消音効果を高めることができる。なお、第１の管状部材１０に貫通孔を形成し、この貫通孔をヘルムホルツ型共鳴系の連通路として機能させることも可能ではあるが、このような構造では連通路の長さが板厚分しか得られず、十分な効果が得られにくい。この点、本実施形態では、連通路の長い構造が実現され、騒音抑制効果を高くすることができる。   Therefore, according to the present embodiment, air column resonance noise can be suppressed at the connection portion between the first tubular member 10 and the second tubular member 20, and as a result, exhaust noise can be suppressed. . In addition, a double tube portion is formed by the first tubular member 10 and the second tubular member 20 forming the exhaust flow path, and the Helmholtz resonance system resonance chamber 31 and the communication passage are formed using the double tube portion. Since 32 is formed, the Helmholtz resonance system can be realized with a simple structure. In particular, since the Helmholtz resonance system is employed, the silencing effect can be enhanced by increasing the volume of the resonance chamber 31. Although it is possible to form a through hole in the first tubular member 10 and make this through hole function as a communication path of the Helmholtz type resonance system, in such a structure, the length of the communication path is equal to the plate thickness. However, it is difficult to obtain a sufficient effect. In this respect, in the present embodiment, a structure having a long communication path is realized, and the noise suppression effect can be enhanced.

［Ａ２］連通路３２には、第１の管状部材１０と第２の管状部材２０との接触を防ぐためのワイヤメッシュ４０が設けられている。ワイヤメッシュ４０は、連通路３２が塞がれないように、第１の管状部材１０の外周において通気路が確保されるように配置されている。したがって、本実施形態によれば、連通路３２が塞がれにくくなる分、排気騒音を抑制する効果を高くすることができる。   [A2] The communication path 32 is provided with a wire mesh 40 for preventing contact between the first tubular member 10 and the second tubular member 20. The wire mesh 40 is disposed so that a ventilation path is secured on the outer periphery of the first tubular member 10 so that the communication path 32 is not blocked. Therefore, according to the present embodiment, the effect of suppressing the exhaust noise can be enhanced as much as the communication path 32 is less likely to be blocked.

［Ａ３］第１の管状部材１０及び第２の管状部材２０は、それぞれが単一の部品で形成されている。したがって、本実施形態によれば、ヘルムホルツ型共鳴系を構成するために専用の部品を別途用いる必要がないため、省スペース化や低コスト化などを図ることができる。すなわち、排気流路を形成する部品に対し、消音器（共鳴室及び連通路）を形成するための専用部品を付加する構成では、構造が複雑となって大型化しやすく、また、部品点数が多く、接合（溶接）箇所も増えるため、コスト高となりやすい。これに対し、本実施形態の消音器３０は、排気流路を形成する第１の管状部材１０及び第２の管状部材２０で構成され、しかも、接合（溶接）箇所が１箇所であるため、省スペース化や低コスト化などを図りやすいという利点がある。加えて、管状部材で構成されるため、曲げ加工が可能であり、排気システム１のレイアウトに適応しやすいという利点もある。   [A3] Each of the first tubular member 10 and the second tubular member 20 is formed of a single component. Therefore, according to the present embodiment, it is not necessary to separately use a dedicated component for configuring the Helmholtz resonance system, so that space saving, cost reduction, and the like can be achieved. That is, in the configuration in which a dedicated part for forming the silencer (resonance chamber and communication path) is added to the part forming the exhaust flow path, the structure is complicated and the size is easily increased, and the number of parts is large. Since the number of joints (welding) increases, the cost tends to increase. On the other hand, the silencer 30 of the present embodiment is composed of the first tubular member 10 and the second tubular member 20 that form the exhaust flow path, and since there is one joining (welding) location, There is an advantage that it is easy to save space and cost. In addition, since it is composed of a tubular member, it can be bent and has the advantage of being easily adaptable to the layout of the exhaust system 1.

［Ａ４］消音器３０は、共鳴周波数がパイプの気柱共鳴周波数のＮ次モードに合致するように設計されており、第１の管状部材１０の先端がＮ次モードの最大音圧の位置となるように配置されている。したがって、本実施形態によれば、共鳴周波数に合致させたモードで最大の低減を得ることができ、また、他のモードでも一定の容量により音圧を低減することで、気柱共鳴音を抑制することができる。   [A4] The silencer 30 is designed so that the resonance frequency matches the Nth order mode of the air column resonance frequency of the pipe, and the tip of the first tubular member 10 is positioned at the position of the maximum sound pressure of the Nth order mode. It is arranged to be. Therefore, according to the present embodiment, it is possible to obtain the maximum reduction in the mode matched to the resonance frequency, and also suppress the air column resonance sound by reducing the sound pressure with a constant capacity in other modes. can do.

［Ａ５］第１の管状部材１０に縮径部１１が形成され、本体部１２の外径Ｒ１以下の外径のワイヤメッシュ４０が用いられているため、ワイヤメッシュ４０を装着した状態の第１の管状部材１０を、第２の管状部材２０に挿入しやすくすることができる。したがって、本実施形態によれば、第１の管状部材１０と第２の管状部材２０との組立てを行いやすくすることができる。   [A5] Since the reduced diameter portion 11 is formed in the first tubular member 10 and the wire mesh 40 having an outer diameter equal to or less than the outer diameter R1 of the main body portion 12 is used, the first in a state where the wire mesh 40 is attached. The tubular member 10 can be easily inserted into the second tubular member 20. Therefore, according to this embodiment, the assembly of the first tubular member 10 and the second tubular member 20 can be facilitated.

以上、本発明の実施形態について説明したが、本発明は、上記実施形態に限定されることなく、種々の形態を採り得ることは言うまでもない。
［Ｂ１］上記実施形態で示したワイヤメッシュ４０は一例であり、これに限定されるものではない。例えば、ワイヤメッシュ４０の個数は１つでもよく、２つ以上でもよい。また、ワイヤメッシュ４０を配置する位置も特に限定されない。具体的には、例えば、リングを半分に割った形状の２つのＣ字状のワイヤメッシュを、第１の管状部材１０の軸方向において、ずらして配置してもよい。また、ワイヤメッシュ４０以外の部材をスペーサとして用いてもよい。また、第１の管状部材１０及び第２の管状部材２０のうち少なくとも
一方を加工（例えば凸部を形成）して、スペーサを形成してもよい。また、スペーサを有しない構成としてもよい。 As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that this invention can take a various form, without being limited to the said embodiment.
[B1] The wire mesh 40 shown in the above embodiment is an example, and the present invention is not limited to this. For example, the number of wire meshes 40 may be one, or two or more. Further, the position where the wire mesh 40 is arranged is not particularly limited. Specifically, for example, two C-shaped wire meshes having a shape in which a ring is divided in half may be shifted in the axial direction of the first tubular member 10. Further, a member other than the wire mesh 40 may be used as the spacer. Further, at least one of the first tubular member 10 and the second tubular member 20 may be processed (for example, a convex portion is formed) to form a spacer. Moreover, it is good also as a structure without a spacer.

［Ｂ２］第１の管状部材１０は、複数の部品で形成されていてもよい。例えば、外径Ｒ２の円管部品と、外径Ｒ１の円管部品と、を用いれば、縮径加工する範囲を小さくしたり、縮径加工自体を無くしたりすることができる。同様に、第２の管状部材２０も、複数の部品で形成されていてもよい。   [B2] The first tubular member 10 may be formed of a plurality of parts. For example, if a circular pipe component having an outer diameter R2 and a circular pipe component having an outer diameter R1 are used, the range of diameter reduction processing can be reduced, or the diameter reduction processing itself can be eliminated. Similarly, the second tubular member 20 may be formed of a plurality of parts.

［Ｂ３］第１の管状部材１０は、縮径部１１を有していなくてもよい。例えば、ワイヤメッシュ４０を装着した状態の第１の管状部材１０を、第２の管状部材２０に挿入した後に、第２の管状部材２０の先端部２３を縮径してもよい。   [B3] The first tubular member 10 may not have the reduced diameter portion 11. For example, the distal end portion 23 of the second tubular member 20 may be reduced in diameter after the first tubular member 10 with the wire mesh 40 mounted thereon is inserted into the second tubular member 20.

［Ｂ４］上記実施形態では、第１の管状部材１０と第２の管状部材２０とが、同じ外径の円管部品を用いて形成されているが、これに限定されるものではない。例えば、第２の管状部材２０として、第１の管状部材１０よりも外径の大きい円管部品を用いてもよい。また、第１の管状部材１０及び第２の管状部材２０は、円管部品以外の部品（例えば、断面が楕円形や多角形の管状部材）を用いて形成されていてもよい。   [B4] In the above embodiment, the first tubular member 10 and the second tubular member 20 are formed using circular pipe components having the same outer diameter, but the present invention is not limited to this. For example, as the second tubular member 20, a circular pipe component having an outer diameter larger than that of the first tubular member 10 may be used. Moreover, the 1st tubular member 10 and the 2nd tubular member 20 may be formed using components (for example, a tubular member whose cross section is an ellipse or a polygon) other than a circular pipe component.

［Ｂ５］上記実施形態で示した共鳴室３１は一例であり、これに限定されるものではない。例えば、上記実施形態では、側方視で（軸方向に対して垂直な方向から見て）概略台形状に膨らんだ拡径部２１により共鳴室３１が形成されているが、これに代えて、例えば概略三角形状や概略長方形状に膨らんだ拡径部により共鳴室を形成してもよい。   [B5] The resonance chamber 31 shown in the above embodiment is an example, and the present invention is not limited to this. For example, in the above embodiment, the resonance chamber 31 is formed by the enlarged-diameter portion 21 swelled in a substantially trapezoidal shape when viewed from the side (viewed from a direction perpendicular to the axial direction). For example, the resonance chamber may be formed by an enlarged diameter portion that swells in a substantially triangular shape or a substantially rectangular shape.

［Ｂ６］上記実施形態では、サブマフラ４とメインマフラ５とを接続する排気流路に消音器３０が配置された構成を例示したが、これに限定されるものではない。また、前提となる排気システムの構成も上記実施形態に限定されるものではなく、例えば、サブマフラを有しない構成としてもよい。また、第１の管状部材（二重管部の内管）と第２の管状部材（二重管部の外管）との上流／下流の位置関係は、上記実施形態と逆であってもよい。つまり、排気流路の上流側に第２の管状部材を配置し、その下流側に第１の管状部材を配置してもよい。   [B6] In the above embodiment, the configuration in which the silencer 30 is disposed in the exhaust flow path connecting the sub muffler 4 and the main muffler 5 is illustrated, but the present invention is not limited to this. Further, the configuration of the exhaust system as a premise is not limited to the above embodiment, and for example, a configuration without a sub-muffler may be employed. Also, the upstream / downstream positional relationship between the first tubular member (inner tube of the double tube portion) and the second tubular member (outer tube of the double tube portion) may be the reverse of the above embodiment. Good. That is, the second tubular member may be disposed on the upstream side of the exhaust flow path, and the first tubular member may be disposed on the downstream side thereof.

［Ｂ７］本発明の各構成要素は概念的なものであり、上記実施形態に限定されない。例えば、１つの構成要素が有する機能を複数の構成要素に分散させたり、複数の構成要素が有する機能を１つの構成要素に統合したりしてもよい。また、上記実施形態の構成の少なくとも一部を、同様の機能を有する公知の構成に置き換えてもよい。   [B7] Each component of the present invention is conceptual and is not limited to the above embodiment. For example, the functions of one component may be distributed to a plurality of components, or the functions of a plurality of components may be integrated into one component. Further, at least a part of the configuration of the above embodiment may be replaced with a known configuration having the same function.

１…排気システム、２…流路部材、３…触媒コンバータ、４…サブマフラ、５…メインマフラ、１０…第１の管状部材、１１…縮径部、１２…本体部、２０…第２の管状部材、２１…拡径部、２２…本体部、２３…先端部、３０…消音器、３１…共鳴室、３２…連通路、４０…ワイヤメッシュ   DESCRIPTION OF SYMBOLS 1 ... Exhaust system, 2 ... Flow path member, 3 ... Catalytic converter, 4 ... Sub muffler, 5 ... Main muffler, 10 ... 1st tubular member, 11 ... Reduced diameter part, 12 ... Main-body part, 20 ... 2nd tubular Member, 21 ... enlarged diameter part, 22 ... main body part, 23 ... tip part, 30 ... silencer, 31 ... resonance chamber, 32 ... communication path, 40 ... wire mesh

Claims (3)

内燃機関の排気流路を形成する第１の管状部材と、
前記第１の管状部材に接続され、前記第１の管状部材とともに前記排気流路を形成する第２の管状部材と、
を備え、
前記第１の管状部材の端部が前記第２の管状部材の端部から内側に挿入された二重管部が形成され、
前記第２の管状部材の先端部は、前記第１の管状部材の外周面に接合され、
前記第２の管状部材における前記二重管部を形成する部分は、前記第１の管状部材の先端寄りの第１の部分と、前記第２の管状部材の先端寄りの部分であって前記第１の部分と比較して径が拡大された第２の部分と、を備え、
前記第１の管状部材と前記第２の部分との間には、共鳴室が形成され、
前記第１の管状部材と前記第１の部分との間には、前記排気流路と前記共鳴室とを連通する連通路が形成され、
前記共鳴室及び前記連通路によりヘルムホルツ型共鳴系が構成されている
ことを特徴とする消音器。 A first tubular member forming an exhaust passage of the internal combustion engine;
A second tubular member connected to the first tubular member and forming the exhaust passage together with the first tubular member;
With
A double tube portion is formed in which an end portion of the first tubular member is inserted inward from an end portion of the second tubular member;
The distal end portion of the second tubular member is joined to the outer peripheral surface of the first tubular member,
The portion of the second tubular member forming the double tube portion is a first portion near the tip of the first tubular member and a portion near the tip of the second tubular member, A second portion whose diameter is enlarged compared to the first portion,
A resonance chamber is formed between the first tubular member and the second portion,
Between the first tubular member and the first portion, a communication path that connects the exhaust flow path and the resonance chamber is formed,
A silencer characterized in that a Helmholtz resonance system is constituted by the resonance chamber and the communication path. 請求項１に記載の消音器であって、
前記連通路には、前記第１の管状部材と前記第２の管状部材との接触を防ぐためのスペーサが設けられ、
前記スペーサは、前記連通路が塞がれないように、前記第１の管状部材の外周において通気路が確保されるように配置されている
ことを特徴とする消音器。 The muffler according to claim 1,
The communication path is provided with a spacer for preventing contact between the first tubular member and the second tubular member,
The silencer, wherein the spacer is disposed so that a ventilation path is secured on an outer periphery of the first tubular member so that the communication path is not blocked. 請求項１又は請求項２に記載の消音器であって、
前記第１の管状部材及び前記第２の管状部材は、それぞれが単一の部品で形成されている
ことを特徴とする消音器。 The muffler according to claim 1 or 2,
Each of the first tubular member and the second tubular member is formed of a single component.
JP2013003714A 2013-01-11 2013-01-11 Silencer Active JP6162407B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2013003714A JP6162407B2 (en) 2013-01-11 2013-01-11 Silencer
US14/758,730 US20150337699A1 (en) 2013-01-11 2013-12-18 Muffler
CN201380069828.6A CN104903556A (en) 2013-01-11 2013-12-18 Muffler
EP13871221.1A EP2944783A4 (en) 2013-01-11 2013-12-18 Muffler
PCT/JP2013/083960 WO2014109192A1 (en) 2013-01-11 2013-12-18 Muffler
CA2897138A CA2897138A1 (en) 2013-01-11 2013-12-18 Muffler

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EP2944783A1 (en) 2015-11-18
CN104903556A (en) 2015-09-09
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JP6162407B2 (en) 2017-07-12
EP2944783A4 (en) 2016-08-31
CA2897138A1 (en) 2014-07-17

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