JP6416944B2 - Suppression member - Google Patents

Suppression member Download PDF

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JP6416944B2
JP6416944B2 JP2017005790A JP2017005790A JP6416944B2 JP 6416944 B2 JP6416944 B2 JP 6416944B2 JP 2017005790 A JP2017005790 A JP 2017005790A JP 2017005790 A JP2017005790 A JP 2017005790A JP 6416944 B2 JP6416944 B2 JP 6416944B2
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outer shell
opening
suppression
muffler
shell member
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JP2018115577A (en
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祐貴 納見
祐貴 納見
清道 小堀
清道 小堀
貝沼　克彦
克彦 貝沼
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Futaba Industrial Co Ltd
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Futaba Industrial Co Ltd
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Priority to JP2017005790A priority Critical patent/JP6416944B2/en
Priority to CN201810034844.6A priority patent/CN108331638B/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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly

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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)

Description

本開示は、車両のマフラに取り付けられる抑制部材に関する。   The present disclosure relates to a suppression member attached to a muffler of a vehicle.

柱状のマフラの側面をなす板状の部材であるアウタシェルを、二重構造とすることが知られている。また、特許文献１には、二重構造の円筒状のアウタシェルの内側の部分に、溝状の２つのビードを設けることが記載されている。これにより、アウタシェルの剛性が向上する。その結果、アウタシェルの振動が抑制され、マフラにて生じる放射音を抑制できる。   It is known that an outer shell, which is a plate-like member that forms the side surface of a columnar muffler, has a double structure. Patent Document 1 describes that two groove-shaped beads are provided in an inner portion of a cylindrical outer shell having a double structure. Thereby, the rigidity of the outer shell is improved. As a result, the vibration of the outer shell is suppressed, and the radiated sound generated by the muffler can be suppressed.

特開２００６−２６６２１５号公報JP 2006-266215 A

しかしながら、単にアウタシェルの剛性を向上させるだけでは、マフラからの騒音を十分に抑制できない恐れがある。
マフラからの騒音を、より好適に抑制するのが望ましい。 However, simply improving the rigidity of the outer shell may not sufficiently suppress noise from the muffler.
It is desirable to more suitably suppress noise from the muffler.

本開示の一側面である抑制部材は、車両に搭載されるマフラの内部に配置される。抑制部材は、壁部と、取付部と、１又は複数の孔部とを備える。壁部は、開口を有した状態で、抑制空間と他の空間とを隔てる。また、取付部は、開口の縁に設けられ、マフラの外面をなす板状の外殻部材により開口が覆われた状態で、外殻部材の内側に取り付けられる。また、１又は複数の孔部は、外殻部材と壁部とにより覆われた抑制空間と、抑制空間の外部の空間とを繋ぐ。   The suppression member which is one side of this indication is arranged inside a muffler carried in vehicles. The suppression member includes a wall portion, an attachment portion, and one or a plurality of holes. The wall portion separates the suppression space and the other space while having an opening. The attachment portion is provided at the edge of the opening, and is attached to the inside of the outer shell member in a state where the opening is covered by a plate-like outer shell member that forms the outer surface of the muffler. In addition, the one or more hole portions connect the suppression space covered by the outer shell member and the wall portion and the space outside the suppression space.

このような構成によれば、抑制部材をマフラの外殻部材の内側に取り付けることにより、ヘルムホルツ共鳴器を形成可能となる。このため、特定の周波数の排気音を減衰可能となる。また、抑制部材を外殻部材の内側に取り付けることで、外殻部材の剛性が向上する。これにより、外殻部材の振動が抑制され、その結果、マフラから生じる放射音を抑制できる。さらに、外殻部材の内側に取り付けられた抑制部材により、マフラの外部への騒音の透過が抑制される。したがって、マフラからの騒音を、より好適に抑制できる。   According to such a configuration, a Helmholtz resonator can be formed by attaching the suppression member to the inside of the outer shell member of the muffler. For this reason, it becomes possible to attenuate the exhaust sound of a specific frequency. Moreover, the rigidity of an outer shell member improves by attaching a suppression member to the inner side of an outer shell member. Thereby, the vibration of the outer shell member is suppressed, and as a result, the radiated sound generated from the muffler can be suppressed. Furthermore, the transmission of noise to the outside of the muffler is suppressed by the suppression member attached to the inside of the outer shell member. Therefore, the noise from the muffler can be more suitably suppressed.

なお、外殻部材の形状は、予め定められた伸長方向に延びる柱状であっても良い。また、外殻部材のうち、外殻部材の側面をなす部分を側面部としても良い。そして、取付部は、側面部に開口が覆われた状態で、側面部の内側に取り付けられても良い。   The shape of the outer shell member may be a columnar shape extending in a predetermined extension direction. Moreover, it is good also considering the part which makes the side surface of an outer shell member among outer shell members as a side part. And an attaching part may be attached to the inner side of a side part in the state by which the opening was covered by the side part.

柱状の外殻部材の側面部は、底面をなす部分等に比べて剛性が低い。このため、側面部の振動による放射音が生じ易い。これに対し、上記構成によれば、側面部の剛性を高め、振動を抑制できる。したがって、より一層、放射音を抑制できる。   The side surface portion of the columnar outer shell member has lower rigidity than the portion forming the bottom surface. For this reason, it is easy to produce the radiated sound by the vibration of a side part. On the other hand, according to the said structure, the rigidity of a side part can be improved and a vibration can be suppressed. Therefore, the radiated sound can be further suppressed.

また、外殻部材の形状は、伸長方向に直交又は略直交する長手方向に延びる形状であっても良い。そして、取付部は、側面部における長手方向に沿って広がる部分に開口が覆われた状態で、該部分の内側に取り付けられても良い。   Further, the shape of the outer shell member may be a shape extending in the longitudinal direction orthogonal or substantially orthogonal to the extending direction. And an attaching part may be attached to the inner side of this part in the state by which the opening was covered by the part which spreads along the longitudinal direction in a side part.

側面部における長手方向に広がる部分は、他の部分に比べ、湾曲及び／又は屈曲の度合いが小さく、剛性が低い。このため、長手方向に広がる部分では、振動による放射音が生じ易い。これに対し、上記構成によれば、該部分の剛性を高め、振動を抑制できる。したがって、効果的に放射音を抑制できる。   The portion extending in the longitudinal direction in the side surface portion has a lower degree of bending and / or bending and lower rigidity than the other portions. For this reason, in the part which spreads in a longitudinal direction, the radiated sound by a vibration tends to arise. On the other hand, according to the said structure, the rigidity of this part can be improved and a vibration can be suppressed. Therefore, the radiated sound can be effectively suppressed.

また、１又は複数の孔部は、壁部を貫通する部位であっても良い。
このような構成によれば、好適に特定の周波数の排気音を減衰させることができる。
また、取付部は、開口の縁に沿って延びるフランジ状の部位であっても良い。そして、１又は複数の孔部は、取付部に設けられた溝状の部位であっても良い。 Moreover, the site | part which penetrates a wall part may be sufficient as a 1 or several hole part.
According to such a configuration, it is possible to suitably attenuate the exhaust sound having a specific frequency.
Further, the attachment portion may be a flange-like portion extending along the edge of the opening. The one or more holes may be a groove-like portion provided in the attachment portion.

このような構成によれば、好適に特定の周波数の排気音を減衰させることができる。   According to such a configuration, it is possible to suitably attenuate the exhaust sound having a specific frequency.

図１Ａ，１Ｂは、それぞれ、本実施形態の抑制部材が取り付けられたマフラの内部を透過的に示した斜視図、及び、下面図である。図１Ｃは、該マフラの伸長方向に直交する断面を示す説明図である。1A and 1B are respectively a perspective view and a bottom view transparently showing the inside of a muffler to which the suppressing member of this embodiment is attached. FIG. 1C is an explanatory view showing a cross section orthogonal to the extending direction of the muffler. 図２Ａ〜２Ｃは、それぞれ、本実施形態の抑制部材の斜視図、上面図、及び、側面図である。2A to 2C are a perspective view, a top view, and a side view, respectively, of the suppressing member of the present embodiment. 図３Ａは、ヘルムホルツの共鳴原理による消音効果についての説明図であり、本実施形態の抑制部材を側方から見た断面図である。図３Ｂは、本実施形態の抑制部材が取り付けられたマフラ、及び、抑制部材が取り付けられていないマフラから生じる放射音の大きさを示すグラフである。FIG. 3A is an explanatory view of a silencing effect based on Helmholtz's resonance principle, and is a cross-sectional view of the suppressing member of the present embodiment as viewed from the side. FIG. 3B is a graph showing the magnitude of sound emitted from the muffler to which the suppressing member of the present embodiment is attached and the muffler to which the suppressing member is not attached. 図４Ａ，４Ｂは、それぞれ、変形例１の抑制部材の斜視図及び側面図である。また、図４Ｃ，４Ｄは、それぞれ、変形例２の抑制部材の斜視図及び側面図である。4A and 4B are a perspective view and a side view of the suppressing member of Modification 1, respectively. 4C and 4D are a perspective view and a side view of the suppressing member of Modification 2, respectively. 図５Ａは、変形例３の抑制部材の上面図である。また、図５Ｂは、変形例４の抑制部材の斜視図である。FIG. 5A is a top view of the suppressing member of Modification 3. FIG. FIG. 5B is a perspective view of a suppressing member of Modification 4. 図６Ａ，６Ｂは、それぞれ、変形例４の抑制部材の上面図及び側面図である。6A and 6B are a top view and a side view, respectively, of the suppressing member of Modification 4.

以下、本開示の実施形態について図面を用いて説明する。なお、本開示の実施の形態は、下記の実施形態に何ら限定されることはなく、本開示の技術的範囲に属する限り種々の形態を採りうる。   Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Embodiments of the present disclosure are not limited to the following embodiments, and various forms can be adopted as long as they belong to the technical scope of the present disclosure.

［構成の説明］
図１Ａ〜１Ｃに示すように、本実施形態の抑制部材１は、車両に搭載されたマフラ２の内部に配置される。マフラ２は、車両のエンジンの排気を車外に排出する排気経路に配置される。排気は、マフラ２の内部を流下して車外に流出する。本実施形態では、１又は複数の抑制部材１が、マフラ２の外殻部材２０における側面部２１の内側に取り付けられる。 [Description of configuration]
As shown in FIGS. 1A to 1C, the suppressing member 1 of the present embodiment is disposed inside a muffler 2 mounted on a vehicle. The muffler 2 is disposed in an exhaust path for exhausting the exhaust of the vehicle engine to the outside of the vehicle. The exhaust flows down the muffler 2 and flows out of the vehicle. In the present embodiment, one or more restraining members 1 are attached to the inside of the side surface portion 21 of the outer shell member 20 of the muffler 2.

外殻部材２０とは、マフラ２の外面をなす板状の部材である。外殻部材２０は、マフラ２の内部と外部とを隔てる。外殻部材２０の形状は、予め定められた伸長方向２ａに延びる柱状となっている。さらに、外殻部材２０は、伸長方向２ａに直交又は略直交する長手方向２ｂに延びる形状となっている。そして、マフラ２は、伸長方向２ａ及び長手方向２ｂが車両の底部に沿うように、車両に搭載される。換言すれば、マフラ２は、横方向に広がった状態で車両の底部に搭載される。なお、外殻部材２０の形状は、例えば、円柱状、又は、角柱状等であっても良い。   The outer shell member 20 is a plate-like member that forms the outer surface of the muffler 2. The outer shell member 20 separates the inside and the outside of the muffler 2. The outer shell member 20 has a columnar shape extending in a predetermined extension direction 2a. Furthermore, the outer shell member 20 has a shape extending in the longitudinal direction 2b orthogonal to or substantially orthogonal to the extending direction 2a. The muffler 2 is mounted on the vehicle such that the extending direction 2a and the longitudinal direction 2b are along the bottom of the vehicle. In other words, the muffler 2 is mounted on the bottom of the vehicle in a state of spreading in the lateral direction. The shape of the outer shell member 20 may be, for example, a columnar shape or a prismatic shape.

また、側面部２１とは、外殻部材２０における側面をなす部分である。側面部２１は、一重に配置された板状部材により構成されている（以後、一重構造と記載）。なお、側面部２１は、二重に配置された板状部材により構成されていても良い（以後、二重構造と記載）。また、外殻部材２０における底面をなす２つの部分を、それぞれ、第１，第２底面部２５，２６と記載する。第１及び第２底面部２５，２６の形状は、一例として、楕円形状となっている。なお、該形状は、例えば、長方形状であっても良い。また、マフラ２の内部空間には、少なくとも１つのセパレータが設けられていても良い。少なくとも１つのセパレータとは、マフラの内部空間を仕切る板状の部位である。また、側面部２１は、長手方向２ｂに沿って広がる２つの長手領域２２を有する。２つの長手領域２２は、長手方向２ｂに直交する向きに対面する。換言すれば、長手領域２２は、側面部２１において、湾曲の度合いが一定の水準に達していない扁平な部分である。   The side surface portion 21 is a portion forming the side surface of the outer shell member 20. The side part 21 is comprised by the plate-shaped member arrange | positioned in single (henceforth a single structure). In addition, the side part 21 may be comprised by the plate-shaped member arrange | positioned doubly (henceforth a double structure). In addition, two portions forming the bottom surface of the outer shell member 20 are referred to as first and second bottom surface portions 25 and 26, respectively. As an example, the shape of the first and second bottom surface portions 25 and 26 is an elliptical shape. The shape may be a rectangular shape, for example. Further, at least one separator may be provided in the inner space of the muffler 2. At least one separator is a plate-like part that partitions the internal space of the muffler. Further, the side surface portion 21 has two longitudinal regions 22 extending along the longitudinal direction 2b. The two longitudinal regions 22 face each other in a direction orthogonal to the longitudinal direction 2b. In other words, the longitudinal region 22 is a flat portion in the side surface portion 21 where the degree of curvature does not reach a certain level.

そして、抑制部材１は、その内部に抑制空間１０を有した状態で、側面部２１の内側に取り付けられる。なお、抑制空間１０は、例えば、空であっても良い。また、抑制空間１０には、例えば、グラスウール等の吸音材が配置されても良い。そして、図２Ａ〜２Ｃに示すように、抑制部材１は、壁部１１と、取付部１５とを備える。また、本実施形態では、抑制部材１は、一例として１つの孔部１６を備える。   And the suppression member 1 is attached inside the side part 21 in the state which has the suppression space 10 in the inside. Note that the suppression space 10 may be empty, for example. Moreover, for example, a sound absorbing material such as glass wool may be disposed in the suppression space 10. 2A to 2C, the suppression member 1 includes a wall portion 11 and an attachment portion 15. Moreover, in this embodiment, the suppression member 1 is provided with the one hole 16 as an example.

壁部１１は、板状の部位である。壁部１１は、開口を有した状態で、抑制空間１０と他の空間とを隔てる。換言すれば、壁部１１は、抑制空間１０が開口を介して他の空間と連通した状態で、抑制空間１０と他の空間とを隔てる。壁部１１は、底面１２と側面１３とを有する。底面１２は、抑制空間１０の開口に対面する。一方、側面１３は、底面１２の外縁から開口に向かって突出する。   The wall part 11 is a plate-shaped part. The wall portion 11 separates the suppression space 10 from other spaces in a state having an opening. In other words, the wall portion 11 separates the suppression space 10 from the other space in a state where the suppression space 10 communicates with the other space through the opening. The wall portion 11 has a bottom surface 12 and a side surface 13. The bottom surface 12 faces the opening of the suppression space 10. On the other hand, the side surface 13 protrudes from the outer edge of the bottom surface 12 toward the opening.

抑制部材１の開口及び底面１２は、一例として、略正方形状となっている。しかし、抑制部材１の開口及び底面１２は、例えば、円形状、楕円形状、矩形状、又は、多角形状等の形状であっても良い。換言すれば、抑制部材１の開口及び底面１２は、中心に相当する位置から外縁までの距離の変動幅が一定の範囲内である形状（換言すれば、細長くない形状）を有していても良い。なお、抑制部材１の開口及び底面１２は、細長い形状であっても良い。また、例えば、抑制部材１の開口及び底面１２は、異なる形状であっても良い。   The opening and the bottom surface 12 of the suppressing member 1 have a substantially square shape as an example. However, the opening and the bottom surface 12 of the suppressing member 1 may have a circular shape, an elliptical shape, a rectangular shape, or a polygonal shape, for example. In other words, the opening and the bottom surface 12 of the suppressing member 1 may have a shape (in other words, a shape that is not elongated) in which the fluctuation range of the distance from the position corresponding to the center to the outer edge is within a certain range. good. The opening and the bottom surface 12 of the suppressing member 1 may have an elongated shape. Further, for example, the opening and the bottom surface 12 of the suppressing member 1 may have different shapes.

取付部１５は、壁部１１の開口の縁に沿って設けられたフランジ状の部位である。取付部１５は、開口の外側に突出する。また、取付部１５は、側面部２１の内面により開口が覆われた状態で、側面部２１の内側に取り付けられる。具体的には、取付部１５は、例えば、側面部２１の内側にスポット溶接により接合されても良い。   The attachment portion 15 is a flange-shaped portion provided along the edge of the opening of the wall portion 11. The attachment portion 15 protrudes outside the opening. The attachment portion 15 is attached to the inside of the side surface portion 21 in a state where the opening is covered with the inner surface of the side surface portion 21. Specifically, the attachment part 15 may be joined to the inner side of the side part 21 by spot welding, for example.

孔部１６は、側面部２１と壁部１１とにより覆われた抑制空間１０と、外殻部材２０の内部における抑制空間１０以外の他の空間とを繋ぐ。孔部１６は、一例として、壁部１１の底面１２に設けられており、底面１２を貫通する。また、孔部１６は、一例として円形となっている。しかし、孔部１６は、他の形状であっても良い。   The hole portion 16 connects the suppression space 10 covered by the side surface portion 21 and the wall portion 11 and a space other than the suppression space 10 inside the outer shell member 20. As an example, the hole 16 is provided on the bottom surface 12 of the wall portion 11 and penetrates the bottom surface 12. Moreover, the hole 16 is circular as an example. However, the hole 16 may have other shapes.

なお、孔部１６は、壁部１１の側面１３に設けられていても良い。また、孔部１６には、ルーバー状の板部が設けられていても良い。該板部は、孔部１６の縁部の一部から、抑制空間１０の内側又は外側に突出する部位である。該板部は、その根元部分以外が孔部１６の縁から離れた状態で、孔部１６の正面に位置する。   The hole portion 16 may be provided on the side surface 13 of the wall portion 11. The hole 16 may be provided with a louvered plate. The plate portion is a portion that protrudes inward or outward of the suppression space 10 from a part of the edge of the hole 16. The plate portion is positioned in front of the hole portion 16 in a state where the base portion is apart from the edge of the hole portion 16.

そして、抑制部材１は、一例として、マフラ２が車両に搭載された際に上側に位置する側面部２１の長手領域２２に取り付けられる。具体的には、抑制部材１の取付部１５は、該長手領域２２により開口が覆われた状態で、該長手領域２２の内側に取り付けられる。なお、抑制部材１は、マフラ２が車両に搭載された際に下側に位置する長手領域２２に取り付けられても良い。また、抑制部材１は、例えば、側面部２１における長手領域２２以外の部分、或いは、第１又は第２底面部２５，２６の内側に取り付けられても良い。   And the suppression member 1 is attached to the longitudinal area 22 of the side part 21 located in an upper side, when the muffler 2 is mounted in a vehicle as an example. Specifically, the attachment portion 15 of the suppressing member 1 is attached to the inside of the longitudinal region 22 in a state where the opening is covered by the longitudinal region 22. In addition, the suppression member 1 may be attached to the longitudinal region 22 located on the lower side when the muffler 2 is mounted on the vehicle. Moreover, the suppressing member 1 may be attached to, for example, a portion other than the longitudinal region 22 in the side surface portion 21 or the inside of the first or second bottom surface portions 25 and 26.

［効果］
（１）上記実施形態の抑制部材１をマフラ２の側面部２１の内側に取り付けることにより、ヘルムホルツ共鳴器を形成可能となる。これにより、車両のエンジンの稼働中に、特定の周波数の排気音を減衰させることができる。なお、排気音とは、例えば、排気の流れにより生じた騒音を意味しても良い。 [effect]
(1) A Helmholtz resonator can be formed by attaching the suppressing member 1 of the above embodiment to the inside of the side surface portion 21 of the muffler 2. Thereby, the exhaust sound of a specific frequency can be attenuated during operation of the engine of the vehicle. The exhaust sound may mean, for example, noise generated by the exhaust flow.

具体的には、図３Ａに示すように、排気がマフラ２の内部を流下する際、抑制部材１の孔部１６での空気振動が大きくなり、摩擦が生じる。これにより、特定の周波数の排気音を発するエネルギーが熱に変換される。その結果、該周波数の排気音が減衰される。   Specifically, as shown in FIG. 3A, when the exhaust gas flows down inside the muffler 2, the air vibration in the hole portion 16 of the suppressing member 1 increases and friction occurs. Thereby, the energy which emits the exhaust sound of a specific frequency is converted into heat. As a result, the exhaust sound having the frequency is attenuated.

なお、孔部１６及び／又は抑制空間１０の大きさ等を調整することで、減衰させる排気音の周波数を調整できる。また、上記実施形態では、壁部１１の底面１２に１つの孔部１６が設けられている。しかし、孔部１６の数及び／又は位置等を変えることで、減衰させる排気音の周波数を調整できる。なお、孔部１６の数が多くなるに従い、より周波数の高い排気音を減衰可能となる。また、孔部１６の面積が広くなるに従い、より周波数の高い排気音を減衰可能となる。   Note that the frequency of the exhaust sound to be attenuated can be adjusted by adjusting the size of the hole 16 and / or the suppression space 10. In the above embodiment, one hole 16 is provided in the bottom surface 12 of the wall 11. However, the frequency of the exhaust sound to be attenuated can be adjusted by changing the number and / or position of the holes 16. As the number of the holes 16 increases, it becomes possible to attenuate the exhaust sound having a higher frequency. In addition, as the area of the hole 16 increases, it becomes possible to attenuate exhaust sound having a higher frequency.

また、側面部２１の内側に取り付けられた抑制部材１により、マフラ２の外部への騒音の透過が抑制される。したがって、マフラ２からの騒音を、より好適に抑制できる。
なお、図３Ｂのグラフは、抑制部材１が取り付けられたマフラ２からの放射音の大きさと、抑制部材１が取り付けられていないマフラ２からの放射音の大きさとを示している。該グラフは、車両のエンジンの回転数に応じた、上記各マフラ２から生じる放射音の大きさを示している。また、図３Ｂのグラフは、抑制部材１を取り付けることにより、マフラ２からの放射音が抑制されることを示している。 Further, the transmission of noise to the outside of the muffler 2 is suppressed by the suppression member 1 attached to the inside of the side surface portion 21. Therefore, noise from the muffler 2 can be more suitably suppressed.
The graph of FIG. 3B shows the magnitude of sound emitted from the muffler 2 to which the suppressing member 1 is attached and the magnitude of sound emitted from the muffler 2 to which the suppressing member 1 is not attached. This graph shows the magnitude of the radiated sound generated from each muffler 2 according to the rotational speed of the engine of the vehicle. Moreover, the graph of FIG. 3B has shown that the radiation | emission sound from the muffler 2 is suppressed by attaching the suppression member 1. FIG.

（２）また、側面部２１は、第１及び第２底面部２５，２６に比べ剛性が低い。このため、側面部２１の振動による放射音が生じ易い。これに対し、上記実施形態では、側面部２１の内側に抑制部材１が取り付けられる。これにより、側面部２１の剛性が向上する。このため、側面部２１の振動が抑制され、その結果、マフラから生じる放射音を抑制できる。   (2) Further, the side surface portion 21 has lower rigidity than the first and second bottom surface portions 25 and 26. For this reason, a radiated sound due to the vibration of the side surface portion 21 is likely to occur. On the other hand, in the said embodiment, the suppression member 1 is attached inside the side part 21. FIG. Thereby, the rigidity of the side part 21 improves. For this reason, the vibration of the side part 21 is suppressed, As a result, the radiated sound which arises from a muffler can be suppressed.

また、抑制部材１は、一重構造又は二重構造の側面部２１に取り付けることができる。二重構造の側面部２１は、一重構造の側面部２１に比べ剛性が高く、放射音をより抑制可能となっている。しかし、側面部２１を二重構造とする場合、一重構造に比べ、側面部２１を構成する板状部材を薄くする必要がある。このため、二重構造の側面部２１を有するマフラ２は、一重構造の側面部２１を有するマフラ２に比べ製造が困難になり、コストが増加する。   Moreover, the suppression member 1 can be attached to the side part 21 of a single structure or a double structure. The side surface portion 21 having a double structure has higher rigidity than the side surface portion 21 having a single structure, and can further suppress radiated sound. However, when the side surface portion 21 has a double structure, it is necessary to make the plate-like member constituting the side surface portion 21 thinner than in the single structure. For this reason, the muffler 2 having the side surface portion 21 having the double structure becomes difficult to manufacture and increases in cost as compared with the muffler 2 having the side surface portion 21 having the single structure.

これに対し、側面部２１を一重構造にした場合であっても、抑制部材１を取り付けることで、側面部２１の剛性を向上できる。さらに、側面部２１を構成する板状部材を薄くしてマフラの質量を低下させた場合であっても、抑制部材１を取り付けることで、側面部２１の剛性を向上できる。このため、側面部２１の振動を抑制でき、その結果、放射音を抑制できる。さらに、上述したようにして、特定の周波数の排気音を減衰できる。このため、マフラ２の製造コストを抑えつつ、マフラ２からの騒音を抑制できる。   On the other hand, even when the side surface portion 21 has a single structure, the rigidity of the side surface portion 21 can be improved by attaching the suppressing member 1. Furthermore, even if it is a case where the plate-shaped member which comprises the side part 21 is made thin and the mass of a muffler is reduced, the rigidity of the side part 21 can be improved by attaching the suppression member 1. FIG. For this reason, the vibration of the side part 21 can be suppressed, and as a result, a radiated sound can be suppressed. Further, as described above, exhaust sound having a specific frequency can be attenuated. For this reason, the noise from the muffler 2 can be suppressed while suppressing the manufacturing cost of the muffler 2.

（３）また、側面部２１における長手領域２２は、他の部分に比べ、湾曲及び／又は屈曲の度合いが小さく、剛性が低い。このため、長手領域２２では、振動による放射音が生じ易い。これに対し、上記実施形態によれば、長手領域２２に抑制部材１が取り付けられる。このため、長手領域２２の剛性を高め、振動を抑制できる。したがって、効果的に放射音を抑制できる。   (3) Further, the longitudinal region 22 in the side surface portion 21 has a lower degree of bending and / or bending and lower rigidity than other portions. For this reason, in the longitudinal region 22, radiated sound due to vibration is likely to occur. On the other hand, according to the embodiment, the suppressing member 1 is attached to the longitudinal region 22. For this reason, the rigidity of the longitudinal region 22 can be increased and vibration can be suppressed. Therefore, the radiated sound can be effectively suppressed.

［変形例］
次に、上記実施形態の抑制部材１の変形例１〜４について説明する。変形例１〜４の抑制部材１は、上記実施形態の抑制部材１と同様の構成を有しているが、孔部１６の構成が上記実施形態と相違している。以下では、各変形例における上記実施形態との相違点について説明する。 [Modification]
Next, modified examples 1 to 4 of the suppressing member 1 of the above embodiment will be described. Although the suppression member 1 of the modified examples 1-4 has the structure similar to the suppression member 1 of the said embodiment, the structure of the hole 16 is different from the said embodiment. Below, the difference with the said embodiment in each modification is demonstrated.

変形例１の抑制部材１は、図４Ａ，４Ｂに示すように、壁部１１の底面１２に設けられた孔部１６の縁に、円筒状の突出部１７が設けられる。突出部１７は、抑制空間１０の外側に向かって突出する。なお、突出部１７は、バーリング加工により設けられても良い。   As shown in FIGS. 4A and 4B, the suppressing member 1 of Modification 1 is provided with a cylindrical protrusion 17 at the edge of the hole 16 provided in the bottom surface 12 of the wall 11. The protruding portion 17 protrudes toward the outside of the suppression space 10. In addition, the protrusion part 17 may be provided by burring process.

また、変形例２の抑制部材１における孔部１６の縁においても、図４Ｃ，４Ｄに示すように、変形例１と同様の突出部１７が設けられる。該突出部１７は、抑制空間１０に向かって突出する。   Moreover, also in the edge of the hole 16 in the suppressing member 1 of Modification 2, as shown in FIGS. 4C and 4D, a protrusion 17 similar to that of Modification 1 is provided. The protruding portion 17 protrudes toward the suppression space 10.

また、変形例３の抑制部材１は、図５Ａに示すように、壁部１１の底面１２に、複数の孔部１６が設けられている。これらの孔部１６は、底面１２の全体にわたって配置される。   Moreover, as shown in FIG. 5A, the suppressing member 1 of Modification 3 is provided with a plurality of hole portions 16 on the bottom surface 12 of the wall portion 11. These holes 16 are arranged over the entire bottom surface 12.

また、変形例４の抑制部材１では、図５Ｂ〜６Ｂに示すように、孔部１６は、取付部１５に設けられている。孔部１６は、取付部１５の取付面に設けられた溝状の部位である。なお、取付面とは、取付部１５が外殻部材２０に取り付けられた際、外殻部材２０に隣接した状態となる面である。また、孔部１６は、取付部１５における幅方向の一端から他端にわたって延びる。つまり、孔部１６の一端は、抑制空間１０に繋がる。また、孔部１６の他端は、抑制空間１０の外部に繋がる。   Moreover, in the suppression member 1 of the modification 4, the hole part 16 is provided in the attachment part 15, as shown to FIG. The hole portion 16 is a groove-like portion provided on the attachment surface of the attachment portion 15. The attachment surface is a surface that is adjacent to the outer shell member 20 when the attachment portion 15 is attached to the outer shell member 20. Further, the hole 16 extends from one end in the width direction of the attachment portion 15 to the other end. That is, one end of the hole 16 is connected to the suppression space 10. Further, the other end of the hole 16 is connected to the outside of the suppression space 10.

そして、抑制部材１が外殻部材２０に取り付けられた際、外殻部材２０と孔部１６との間に隙間が生じる。該隙間は、抑制空間１０と、抑制空間１０の外部とを繋ぐ。該隙間により、抑制部材１は、ヘルムホルツ共鳴器として動作する。なお、取付部１５には、同様に構成された複数の孔部１６が設けられていても良い。   When the suppressing member 1 is attached to the outer shell member 20, a gap is generated between the outer shell member 20 and the hole 16. The gap connects the suppression space 10 and the outside of the suppression space 10. Due to the gap, the suppressing member 1 operates as a Helmholtz resonator. Note that the attachment portion 15 may be provided with a plurality of holes 16 configured in the same manner.

上述した各変形例における抑制部材１においても、上記実施形態と同様の効果を得ることができる。
［他の実施形態］
上記実施形態、及び、変形例１〜４における抑制部材は、マフラ２の外殻部材２０の内側に抑制空間１０を設けることで、特定の周波数の排気音を減衰させる。しかしながら、マフラ２の外殻部材２０の外側に抑制空間を設けることで、特定の周波数の排気音の減衰を行っても良い。具体的には、マフラ２の外殻部材２０の外面に、上記実施形態、及び、変形例１〜４と同様の抑制部材を取り付けても良い。より詳しくは、該抑制部材は、抑制空間の開口が外殻部材２０の外側に覆われた状態で、外殻部材２０の外側に取り付けられても良い。そして、外殻部材２０の外面における該抑制部材に覆われた部分に、外殻部材２０を貫通する孔部を設けても良い。このような構成を有する場合においても、上記実施形態、及び、変形例１〜４と同様の効果を得ることができる。 Also in the suppression member 1 in each modification mentioned above, the effect similar to the said embodiment can be acquired.
[Other Embodiments]
The suppression member in the said embodiment and the modifications 1-4 provides the suppression space 10 inside the outer shell member 20 of the muffler 2, and attenuates the exhaust sound of a specific frequency. However, the exhaust sound of a specific frequency may be attenuated by providing a suppression space outside the outer shell member 20 of the muffler 2. Specifically, the same restraining member as in the above embodiment and the first to fourth modifications may be attached to the outer surface of the outer shell member 20 of the muffler 2. More specifically, the restraining member may be attached to the outside of the outer shell member 20 with the opening of the restraining space covered by the outside of the outer shell member 20. And you may provide the hole which penetrates the outer shell member 20 in the part covered with this suppression member in the outer surface of the outer shell member 20. Even when it has such a structure, the same effect as the said embodiment and the modifications 1-4 can be acquired.

１…抑制部材、２…マフラ、１０…抑制空間、１１…壁部、１２…底面、１３…側面、１５…取付部、１６…孔部、１７…突出部、２０…外殻部材、２１…側面部、２２…長手領域、２５…第１底面部、２６…第２底面部。   DESCRIPTION OF SYMBOLS 1 ... Suppression member, 2 ... Muffler, 10 ... Suppression space, 11 ... Wall part, 12 ... Bottom surface, 13 ... Side surface, 15 ... Mounting part, 16 ... Hole part, 17 ... Projection part, 20 ... Outer shell member, 21 ... Side surface part, 22 ... longitudinal region, 25 ... first bottom surface part, 26 ... second bottom surface part.

Claims (5)

車両に搭載されるマフラの内部に配置される抑制部材であって、
開口を有した状態で、抑制空間と他の空間とを隔てる部位であって、前記開口に対面する底面と、前記底面の縁から前記開口に向かって突出する側面とを有する壁部と、
前記開口の縁に設けられたフランジ状の部位であって、前記マフラの外面をなす板状の外殻部材により前記開口が覆われた状態で、前記外殻部材の内側に取り付けられる部位である取付部と、
前記外殻部材と前記壁部とにより覆われた前記抑制空間と、前記抑制空間の外部の空間とを繋ぐ１又は複数の孔部と、
を備え、
前記底面は、円形状、楕円形状、又は、多角形状であり、
前記取付部は、前記外殻部材における湾曲の度合いが一定の水準に達していない部分に取り付けられる
抑制部材。 A restraining member arranged inside a muffler mounted on a vehicle,
A wall portion having a bottom surface facing the opening and a side surface projecting from the edge of the bottom surface toward the opening, the portion separating the suppression space and the other space in a state having the opening;
A flange-shaped portion provided on the edge of the opening, in a state in which the opening is covered by the plate-shaped outer shell member forming the outer surface of the muffler is a site that is attached to the inside of the outer shell member A mounting part;
One or a plurality of holes that connect the restraint space covered by the outer shell member and the wall and the space outside the restraint space;
Equipped with a,
The bottom surface is circular, elliptical, or polygonal,
The attachment portion is attached to a portion where the degree of curvature of the outer shell member does not reach a certain level.
Suppression member. 請求項１に記載された抑制部材において、
前記外殻部材の形状は、柱状であり、長手方向に延びる楕円形状又は長方形状の底面を有し、
前記外殻部材のうち、前記外殻部材の側面をなす部分を側面部とし、
前記取付部は、前記側面部における前記長手方向に広がる部分である長手領域に前記開口が覆われた状態で、前記側面部の内側に取り付けられる
抑制部材。 The suppressing member according to claim 1,
The shape of the outer shell member is columnar and has an elliptical or rectangular bottom surface extending in the longitudinal direction,
Of the outer shell member, a portion forming a side surface of the outer shell member is a side surface portion,
The mounting portion in a state where the opening in the longitudinal region which is a portion extending in the longitudinal direction definitive on the side surface portion is covered, suppressing member attached to the inside of the side surface portion. 請求項２に記載された抑制部材において、
前記外殻部材は、前記長手領域が車両の底部に沿うように配置され、
前記取付部は、上側に位置する前記長手領域に前記開口が覆われた状態で、前記側面部の内側に取り付けられる
抑制部材。 In the restraining member according to claim 2,
The outer shell member is arranged such that the longitudinal region is along the bottom of the vehicle,
The attachment part is a restraining member attached to the inside of the side part in a state where the opening is covered by the longitudinal region located on the upper side . 請求項１から請求項３のうちのいずれか１項に記載された抑制部材において、
前記１又は複数の孔部は、前記底面を貫通する部位である
抑制部材。 In the suppression member described in any one of Claims 1-3,
The one or more holes are sites that penetrate the bottom surface . 請求項１から請求項３のうちのいずれか１項に記載された抑制部材において、
前記１又は複数の孔部は、前記取付部に設けられた溝状の部位である
抑制部材。 In the suppression member described in any one of Claims 1-3,
Before SL 1 or more holes, the groove-shaped portion and is suppressing member attached to the attachment portion.
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