JP2017096114A - Muffler for vehicle - Google Patents

Muffler for vehicle Download PDF

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JP2017096114A
JP2017096114A JP2015226585A JP2015226585A JP2017096114A JP 2017096114 A JP2017096114 A JP 2017096114A JP 2015226585 A JP2015226585 A JP 2015226585A JP 2015226585 A JP2015226585 A JP 2015226585A JP 2017096114 A JP2017096114 A JP 2017096114A
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intake pipe
silencers
resonance
silencer
axial direction
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JP6587521B2 (en
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智 水谷
Satoshi Mizutani
智 水谷
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Kojima Industries Corp
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Kojima Press Industry Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a muffler for vehicle capable of silencing noise to a target level with smaller cavity volume than that of the conventional one.SOLUTION: All of a plurality of resonance mufflers 30 silence noise of the same frequency, and communication parts 32 of the plurality of resonance mufflers 30 are provided at different positions in the axial direction of an intake pipe 20. Thereby, compared to the case (conventional case) in which a single large-volume muffler is provided, a larger silence effect can be acquired. As a result, cavity volume (total volume) required to silence noise to a target level can be smaller than that of the conventional one.SELECTED DRAWING: Figure 2

Description

本発明は、車両の吸気管に設けられる車両用消音器に関する。   The present invention relates to a vehicle silencer provided in an intake pipe of a vehicle.

例えば内燃機関の吸気管など、動力源を有する通風管は、その動力源自体の音のレベルと管の長さに起因する気柱共鳴が問題となってくる。低減するために、図４に示すように、管の周囲に空洞１ａを設け管２を挿入した形状の共鳴型消音器１が使用されることがある。共鳴型消音器１を使用する場合、図５に示すように、消音器１の取付け位置によって消音効果が異なるため、気柱共鳴（狙いの周波数）を効率よく低減するには、音の気柱共鳴の音圧腹位置（音圧レベルが高い位置）に連通部１ｂを設定することが望ましいことが知られている。なお、図５は、共鳴型消音器設置位置の違いを示しており、図５において、Ａ：消音器無し、Ｂ：連通部１ｂを節位置に設定した場合、Ｃ：連通部１ｂを腹〜節中間位置に設定した場合、Ｄ：連通部１ｂを腹位置に設定した場合、を示す。   For example, an air duct having a power source such as an intake pipe of an internal combustion engine has a problem of air column resonance caused by the sound level of the power source itself and the length of the pipe. In order to reduce this, as shown in FIG. 4, a resonance type silencer 1 having a shape in which a cavity 1a is provided around a pipe and a pipe 2 is inserted may be used. When the resonance type silencer 1 is used, as shown in FIG. 5, since the noise reduction effect varies depending on the mounting position of the silencer 1, in order to efficiently reduce the air column resonance (target frequency), the air column of sound It is known that it is desirable to set the communicating portion 1b at the resonance sound pressure anti-node position (position where the sound pressure level is high). 5 shows the difference in the installation position of the resonance type silencer. In FIG. 5, when A: no silencer is set, B: the communication portion 1b is set to the node position, C: the communication portion 1b is When set to the node intermediate position, D: indicates the case where the communication portion 1b is set to the antinode position.

目標とするレベルまで低減するには、音圧腹位置に連通部１ｂを設定するだけでなく、図６（ｄ）に示すように目標レベルに達するまで空洞（容積）１ａを大きくする必要があるが、搭載スペース上の理由でより小さい空洞（容積）１ａでの実現が望まれている。なお、図６は、取付け位置腹位置における容積の違いを示しており、図６（ｄ）において、Ａ：消音器無し、Ｂ：容積Ｘ（ｃｃ）（図６（ａ））、Ｃ：容積２×Ｘ（ｃｃ）（図６（ｂ））、Ｄ：容積４×Ｘ（ｃｃ）（図６（ｃ））を示す。 In order to reduce to the target level, it is necessary not only to set the communication portion 1b at the sound pressure antinode, but also to increase the cavity (volume) 1a until the target level is reached as shown in FIG. 6 (d). However, realization with a smaller cavity (volume) 1a is desired for reasons of mounting space. 6 shows the difference in volume at the mounting position antinode, and in FIG. 6D, A: no silencer, B: volume X (cc) (FIG. 6A), C: volume 2 × X (cc) (FIG. 6B), D: volume 4 × X (cc) (FIG. 6C).

特開平６−１５９１７４号公報JP-A-6-159174 特開２０１４−１５２６５１号公報JP 2014-152651 A

本発明の目的は、従来に比べて少ない空洞容積で目標レベルまで消音可能な車両用消音器を提供することにある。   An object of the present invention is to provide a vehicle silencer that can mute to a target level with a smaller cavity volume than conventional ones.

上記目的を達成する本発明はつぎの通りである。
（１） 吸気管の周囲で該吸気管の周方向に全周にわたって延びており内部の空洞部が前記吸気管の内部通路と連通部で連通する共鳴型消音器を複数有しており、
複数の前記消音器のそれぞれの前記空洞部の内周側の壁は、前記吸気管を形成する壁で形成されており、
複数の前記消音器は、前記吸気管の軸方向に並んで設けられており、前記吸気管の軸方向に隣り合う２つの消音器同士でそれぞれの前記空洞部を構成する壁の一部を共有し合っており、
複数の前記消音器は、全て同じ周波数を消音しており、
複数の前記消音器のそれぞれの前記連通部は、前記吸気管の軸方向でそれぞれ異なる位置に設けられており、
複数の前記消音器のそれぞれの前記連通部の幅は、２ｍｍ〜２０ｍｍの範囲内に調整されている、車両用消音器。 The present invention for achieving the above object is as follows.
(1) A plurality of resonant silencers that extend around the intake pipe in the circumferential direction of the intake pipe and whose internal cavity communicates with the internal passage of the intake pipe through a communication portion;
The wall on the inner peripheral side of each of the hollow portions of the plurality of silencers is formed of a wall that forms the intake pipe,
The plurality of silencers are provided side by side in the axial direction of the intake pipe, and two silencers adjacent in the axial direction of the intake pipe share a part of the wall constituting each of the hollow portions. And
The plurality of silencers all mute the same frequency,
Each of the communication parts of the plurality of silencers is provided at different positions in the axial direction of the intake pipe,
The vehicle silencer, wherein a width of each communication portion of the plurality of silencers is adjusted within a range of 2 mm to 20 mm.

上記（１）の車両用消音器によれば、つぎの効果を得ることができる。
複数の消音器が、全て同じ周波数を消音しており、複数の消音器のそれぞれの連通部が、吸気管の軸方向でそれぞれ異なる位置に設けられている。これにより、単一の大容量の消音器を設ける場合（従来）に比べて、得られる消音効果が大きくなる。その結果、目標レベルまで消音させるのに要する空洞容積（総容積）は、従来に比べて少なくて済む。 According to the vehicle silencer of the above (1), the following effects can be obtained.
The plurality of silencers all mute the same frequency, and the communication portions of the plurality of silencers are provided at different positions in the axial direction of the intake pipe. Thereby, compared with the case where a single large-capacity silencer is provided (conventional), the obtained silencing effect is increased. As a result, the cavity volume (total volume) required to mute to the target level can be reduced compared to the prior art.

上記（１）の車両用消音器によれば、さらに、つぎの効果を得ることができる。
複数の消音器のそれぞれの空洞部の内周側の壁が、吸気管を形成する壁で形成されており、複数の消音器が、吸気管の軸方向に並んで設けられており、吸気管の軸方向に隣り合う２つの消音器同士でそれぞれの空洞部を構成する壁の一部を共有し合っている。そのため、消音器の重量増加を抑制できるだけでなく、消音器のコストおよびスペース上で有利である。 According to the vehicle silencer of (1) above, the following effects can be further obtained.
The inner peripheral wall of each cavity of the plurality of silencers is formed by a wall that forms an intake pipe, and the plurality of silencers are provided side by side in the axial direction of the intake pipe. The two silencers adjacent to each other in the axial direction share a part of the wall constituting each cavity. Therefore, not only can the increase in the weight of the silencer be suppressed, it is advantageous in terms of the cost and space of the silencer.

また、複数の消音器のそれぞれの連通部の幅が、２ｍｍ〜２０ｍｍの範囲内に調整されている。このため、連通部が設けられることによる気流音の発生を抑制できる。   Moreover, the width | variety of each communication part of a some silencer is adjusted in the range of 2 mm-20 mm. For this reason, generation | occurrence | production of the airflow sound by providing a communication part can be suppressed.

本発明実施例の車両用消音器の斜視図である。It is a perspective view of the silencer for vehicles of the example of the present invention. 本発明実施例の車両用消音器の拡大断面図である。It is an expanded sectional view of the silencer for vehicles of the example of the present invention. 本発明実施例の車両用消音器によって得られる消音効果を示す、音のレベル−周波数のグラフである。なお、図中において、Ａ：消音器無し（気柱共鳴）、Ｂ：本発明実施例の消音器を用いた場合であって、図６（ｃ）の単一の容積４×Ｘ（ｃｃ）を持つ消音器と同一外形を持つ場合、Ｃ：比較のために示される図６（ｃ）の単一の容積４×Ｘ（ｃｃ）を持つ消音器を用いた場合、を示す。It is a graph of the sound level-frequency which shows the silencing effect obtained by the silencer for vehicles of the example of the present invention. In the figure, A: no silencer (air column resonance), B: a case where the silencer of the embodiment of the present invention is used, and a single volume 4 × X (cc) of FIG. In the case of using the silencer having the same external shape as the silencer having C, C: the case where the silencer having a single volume 4 × X (cc) of FIG. 6C shown for comparison is used. 従来の車両用消音器の断面図である。It is sectional drawing of the conventional silencer for vehicles. 図４のタイプの共鳴型消音器の設置位置で得られる消音効果の違いを示す、音のレベル−周波数のグラフである。なお、図中において、Ａ：消音器無し（気柱共鳴）、Ｂ：連通部を節位置に設定した場合、Ｃ：連通部を腹〜節中間位置に設定した場合、Ｄ：連通部を腹位置に設定した場合、を示す。FIG. 5 is a sound level-frequency graph showing the difference in the silencing effect obtained at the installation position of the resonant silencer of the type in FIG. 4. In the figure, A: no silencer (air column resonance), B: when the communicating part is set to the node position, C: when the communicating part is set to the middle to middle position, D: the communicating part is the belly When set to position, indicates. 図４のタイプの共鳴型消音器の空洞部の容積の違いで得られる消音効果の違いを示す説明図であり、図６（ｄ）は、音のレベル−周波数のグラフである。図６（ｄ）において、Ａ：消音器無し（気柱共鳴）、Ｂ：容積Ｘ（ｃｃ）（図６（ａ））、Ｃ：容積２×Ｘ（ｃｃ）（図６（ｂ））、Ｄ：容積４×Ｘ（ｃｃ）（図６（ｃ））、を示す。FIG. 6D is an explanatory diagram showing the difference in the silencing effect obtained by the difference in the volume of the cavity of the resonance silencer of the type in FIG. 4, and FIG. 6D is a graph of the sound level-frequency. 6 (d), A: no silencer (air column resonance), B: volume X (cc) (FIG. 6 (a)), C: volume 2 × X (cc) (FIG. 6 (b)), D: Volume 4 × X (cc) (FIG. 6C).

以下に、本発明実施例の車両用消音器１０を、図面を参照して、説明する。   Below, silencer 10 for vehicles of the example of the present invention is explained with reference to drawings.

内燃機関の吸気管２０は、その動力源自体の音のレベルと管の長さに起因する気柱共鳴が問題となっており、これを低減するために図１に示すように、車両用消音器１０が設けられる。車両用消音器１０は、図２に示すように、吸気管２０の周囲に空洞３１を設け吸気管２０を挿入した形状となっている。詳しくは、車両用消音器１０は、吸気管２０の周囲で吸気管２０の周方向に全周にわたって延びており内部の空洞部３１が吸気管２０の内部通路２１と連通部３２で連通する共鳴型消音器３０を複数有する。 The intake pipe 20 of the internal combustion engine has a problem of air column resonance caused by the sound level of the power source itself and the length of the pipe, and in order to reduce this, as shown in FIG. A vessel 10 is provided. As shown in FIG. 2, the vehicle silencer 10 has a shape in which a cavity 31 is provided around the intake pipe 20 and the intake pipe 20 is inserted. Specifically, the vehicle silencer 10 extends around the intake pipe 20 in the circumferential direction of the intake pipe 20, and the internal cavity portion 31 communicates with the internal passage 21 of the intake pipe 20 through the communication portion 32. A plurality of mold silencers 30 are provided.

複数の共鳴型消音器３０は、それぞれ、１つの空洞部３１を有する。複数の共鳴型消音器３０のそれぞれの空洞部３１の内周側の壁３１ａは、吸気管２０を形成する壁で形成されている。その壁３１ａに連通部３２が形成されている。複数の共鳴型消音器３０は、吸気管２０の軸方向（延び方向）に並んで設けられており、吸気管２０の軸方向に隣り合う２つの共鳴型消音器３０同士で、それぞれの空洞部３１を構成する壁の一部３１ｂを共有し合っている。複数の共鳴型消音器３０のそれぞれの最外周壁３１ｃは、全て、吸気管２０の半径方向で同位置にある。 Each of the plurality of resonant silencers 30 has one cavity 31. A wall 31 a on the inner peripheral side of each cavity 31 of the plurality of resonance silencers 30 is formed by a wall that forms the intake pipe 20. A communication portion 32 is formed on the wall 31a. The plurality of resonance-type silencers 30 are provided side by side in the axial direction (extending direction) of the intake pipe 20, and the two resonance-type silencers 30 adjacent to each other in the axial direction of the intake pipe 20 are provided with respective hollow portions. A portion 31b of the wall constituting the portion 31 is shared. All of the outermost peripheral walls 31 c of the plurality of resonance silencers 30 are all at the same position in the radial direction of the intake pipe 20.

複数の共鳴型消音器３０のそれぞれの連通部３２（各共鳴型消音器３０の連通部３２）は、吸気管２０の軸方向でそれぞれ異なる位置に設けられている。吸気管２０の軸方向に隣り合う共鳴型消音器３０同士で、それぞれの連通部３２は、共鳴型消音器３０を構成する壁の板厚よりも吸気管２０の軸方向に離れている。複数の共鳴型消音器３０のそれぞれの連通部３２の幅（吸気管２０軸方向長さ）は、２ｍｍ〜２０ｍｍの範囲内に調整されている。複数の共鳴型消音器３０は、それぞれ、１つの連通部３２のみを有していてもよく、複数の連通部３２を有していてもよい。 The communication portions 32 of the plurality of resonance silencers 30 (communication portions 32 of the resonance silencers 30) are provided at different positions in the axial direction of the intake pipe 20. In the resonance silencers 30 adjacent to each other in the axial direction of the intake pipe 20, each communication portion 32 is separated in the axial direction of the intake pipe 20 from the wall thickness of the wall constituting the resonance silencer 30. The width (length in the intake pipe 20 axial direction) of each communicating portion 32 of the plurality of resonance type silencers 30 is adjusted within a range of 2 mm to 20 mm. Each of the plurality of resonance silencers 30 may have only one communication portion 32 or may have a plurality of communication portions 32.

（ｉ）１つの共鳴型消音器３０が１つの連通部３２のみを有する場合、連通部３２は、吸気管２０の軸方向で単一箇所に設けられており、吸気管２０の周方向に全周にわたって連続して設けられていてもよく、吸気管２０の周方向の一部のみに設けられていてもよい。 (I) When one resonance muffler 30 has only one communication portion 32, the communication portion 32 is provided at a single location in the axial direction of the intake pipe 20, and all of the communication silencers 30 are arranged in the circumferential direction of the intake pipe 20. It may be provided continuously over the circumference, or may be provided only in a part of the intake pipe 20 in the circumferential direction.

（ｉｉ）１つの共鳴型消音器３０が複数の連通部３２を有する場合、１つの共鳴型消音器３０の複数の連通部３２は、吸気管２０の軸方向で同じ個所（単一箇所）に設けられており、吸気管２０の周方向で異なる位置に設けられている。また、１つの共鳴型消音器３０が複数の連通部３２を有する場合、１つの共鳴型消音器３０の各連通部３２は、同じ連通路長（吸気管２０の板厚、連通部３２の長さ）、同じ連通路面積（連通部３２の幅（吸気管２０軸方向長さ）および吸気管２０周方向長さ）となっている。これは、共鳴型消音器３０の消音周波数は、空洞部３１の容積・連通路長（吸気管２０の板厚、連通部３２の長さ）・連通路面積（連通部３２の幅および周方向長さ）・音速で決まるため、狙った単一の周波数における消音効果を得るためである。 (Ii) When one resonance muffler 30 has a plurality of communication portions 32, the plurality of communication portions 32 of one resonance muffler 30 are at the same location (single location) in the axial direction of the intake pipe 20. It is provided at different positions in the circumferential direction of the intake pipe 20. Further, when one resonance muffler 30 has a plurality of communication portions 32, each communication portion 32 of one resonance silencer 30 has the same communication path length (the thickness of the intake pipe 20, the length of the communication portion 32. And the same communication passage area (the width of the communication portion 32 (length in the intake pipe 20 axial direction) and the length in the circumferential direction of the intake pipe 20). This is because the silencing frequency of the resonance silencer 30 is such that the volume of the cavity 31, the communication path length (the plate thickness of the intake pipe 20, the length of the communication part 32), the communication path area (the width of the communication part 32 and the circumferential direction). This is to obtain a silencing effect at a single targeted frequency because it is determined by the length) and the speed of sound.

複数の共鳴型消音器３０は、全て同じ周波数を消音できるように設定されている。空洞部３１の容積と連通路長（吸気管２０の板厚、連通部３２の長さ）が決まった状態で、連通路面積（連通部３２の幅および周方向長さ）を調整することで、狙いの消音周波数に設定される。   The plurality of resonance-type silencers 30 are set so that all can mute the same frequency. By adjusting the area of the communication passage (the width of the communication portion 32 and the length in the circumferential direction) with the volume of the cavity 31 and the communication passage length (the thickness of the intake pipe 20 and the length of the communication portion 32) determined. , Set to the target mute frequency.

つぎに、本発明実施例の作用、効果を説明する。
複数の共鳴型消音器３０が、全て同じ周波数を消音しており、複数の共鳴型消音器３０のそれぞれの連通部３２が、吸気管２０の軸方向でそれぞれ異なる位置に設けられている。これにより、図３に示すように、同一外形を持つ単一の大容量の消音器を設ける場合（従来、図３のＣの場合）に比べて、狙った周波数で得られる消音効果（図３のＢ）が大きくなる。その結果、同一外形を持つ単一の大容量の消音器を設ける場合よりも小さい外形で、目標レベルまで消音させることができる。よって、目標レベルまで消音させるのに要する空洞容積（総容積）は、従来に比べて少なくて済む。 Next, the operation and effect of the embodiment of the present invention will be described.
The plurality of resonance silencers 30 all mute the same frequency, and the communication portions 32 of the plurality of resonance silencers 30 are provided at different positions in the axial direction of the intake pipe 20. As a result, as shown in FIG. 3, a silencing effect (FIG. 3) obtained at a target frequency is obtained as compared with a case where a single large-capacity silencer having the same outer shape is provided (conventionally, in the case of FIG. B) becomes larger. As a result, it is possible to mute to the target level with a smaller external shape than when a single large-capacity silencer having the same external shape is provided. Therefore, the cavity volume (total volume) required to mute to the target level is smaller than in the past.

複数の共鳴型消音器３０のそれぞれの空洞部３１の内周側の壁３１ａが、吸気管２０を形成する壁で形成されており、複数の共鳴型消音器３０が、吸気管２０の軸方向に並んで設けられており、吸気管２０の軸方向に隣り合う２つの消音器３０同士でそれぞれの空洞部３１を構成する壁の一部３１ｂを共有し合っている。そのため、共鳴型消音器３０の重量増加を抑制できるだけでなく、消音器１０のコストおよびスペース上で有利である。 A wall 31 a on the inner peripheral side of each cavity 31 of each of the plurality of resonance silencers 30 is formed by a wall forming the intake pipe 20, and the plurality of resonance silencers 30 are in the axial direction of the intake pipe 20. The two silencers 30 adjacent to each other in the axial direction of the intake pipe 20 share a part 31b of the wall constituting each cavity 31. Therefore, not only can the increase in the weight of the resonance silencer 30 be suppressed, but the cost and space of the silencer 10 are advantageous.

複数の共鳴型消音器３０のそれぞれの連通部３２の幅が、２ｍｍ〜２０ｍｍの範囲内に調整されている。このため、連通部３２が複数設けられることによる気流音の発生を抑制できる。 The width of each communication portion 32 of the plurality of resonance silencers 30 is adjusted within a range of 2 mm to 20 mm. For this reason, generation | occurrence | production of the airflow sound by providing the communication part 32 with two or more can be suppressed.

１０ 車両用消音器
２０ 吸気管
３０ 共鳴型消音器
３１ 空洞部
３１ａ 空洞部の内周側の壁
３１ｂ 隣り合う２つの共鳴型消音器同士で共有し合う壁
３１ｃ 共鳴型消音器の最外周壁
３２ 連通部 DESCRIPTION OF SYMBOLS 10 Vehicle silencer 20 Intake pipe 30 Resonance-type silencer 31 Cavity part 31a Wall 31b on the inner peripheral side of the cavity part 31c A wall 31c shared by two adjacent resonance-type silencers Communication part

Claims (1)

吸気管の周囲で該吸気管の周方向に全周にわたって延びており内部の空洞部が前記吸気管の内部通路と連通部で連通する共鳴型消音器を複数有しており、
複数の前記消音器のそれぞれの前記空洞部の内周側の壁は、前記吸気管を形成する壁で形成されており、
複数の前記消音器は、前記吸気管の軸方向に並んで設けられており、前記吸気管の軸方向に隣り合う２つの消音器同士でそれぞれの前記空洞部を構成する壁の一部を共有し合っており、
複数の前記消音器は、全て同じ周波数を消音しており、
複数の前記消音器のそれぞれの前記連通部は、前記吸気管の軸方向でそれぞれ異なる位置に設けられており、
複数の前記消音器のそれぞれの前記連通部の幅は、２ｍｍ〜２０ｍｍの範囲内に調整されている、車両用消音器。 A plurality of resonance silencers extending around the intake pipe in the circumferential direction of the intake pipe and having an internal cavity communicating with the internal passage of the intake pipe through a communication portion;
The wall on the inner peripheral side of each of the hollow portions of the plurality of silencers is formed of a wall that forms the intake pipe,
The plurality of silencers are provided side by side in the axial direction of the intake pipe, and two silencers adjacent in the axial direction of the intake pipe share a part of the wall constituting each of the hollow portions. And
The plurality of silencers all mute the same frequency,
Each of the communication parts of the plurality of silencers is provided at different positions in the axial direction of the intake pipe,
The vehicle silencer, wherein a width of each communication portion of the plurality of silencers is adjusted within a range of 2 mm to 20 mm.
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