JP4551781B2 - Exhaust muffler - Google Patents

Exhaust muffler Download PDF

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Publication number
JP4551781B2
JP4551781B2 JP2005024548A JP2005024548A JP4551781B2 JP 4551781 B2 JP4551781 B2 JP 4551781B2 JP 2005024548 A JP2005024548 A JP 2005024548A JP 2005024548 A JP2005024548 A JP 2005024548A JP 4551781 B2 JP4551781 B2 JP 4551781B2
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exhaust
sound absorbing
punching plate
pipe
partition wall
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JP2006207562A (en
JP2006207562A5 (en
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賢一 守本
明広 濱田
流美 安藤
裕一 田中
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2005024548A priority Critical patent/JP4551781B2/en
Priority to TW094146950A priority patent/TW200628688A/en
Priority to KR1020060000927A priority patent/KR100767139B1/en
Priority to CN2006100012485A priority patent/CN1814994B/en
Publication of JP2006207562A publication Critical patent/JP2006207562A/en
Publication of JP2006207562A5 publication Critical patent/JP2006207562A5/ja
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
    • A47C31/10—Loose or removable furniture covers
    • A47C31/11—Loose or removable furniture covers for chairs

Description

この発明は自動２輪車等に使用される内燃機関用の排気マフラーに関する。 The present invention relates to an exhaust muffler for an internal combustion engine used in a motorcycle or the like.

内部を隔壁により複数の膨張室に区画し、各膨張室間を小径の連通管で接続して排気経路を長くし、かつ膨張を反復することにより排気音エネルギーを減衰して消音する内燃機関用の排気マフラー構造が知られている。また、隔壁に多数の小孔を設け、これに排気ガスを通過させることにより大きな排気音エネルギーの減衰を生じさせるようにして、排気音の低減を図るようにしたものもある。
特開２００４ー１８３６２２号公報 For internal combustion engines that divide the interior into multiple expansion chambers by partition walls, connect the expansion chambers with small-diameter communication pipes to lengthen the exhaust path, and attenuate the exhaust sound energy to mute by repeating expansion The exhaust muffler structure is known. In addition, there is also a structure in which a large number of small holes are provided in the partition wall, and exhaust gas is caused to pass therethrough so as to cause a great attenuation of exhaust sound energy, thereby reducing exhaust sound.
JP 2004-183622 A

ところで隔壁に多数の小孔を設ける上記構造の場合、排気ガスがこの隔壁の小孔を通過することにより、排気音エネルギーを減衰させて排気音を低減させることができるが、排気抵抗が増大するので出力に影響を生じる場合がある。
そこで本願は排気抵抗を増大させることなく排気音エネルギーを低減させて排気音を効率的に低減させることを目的とする。 By the way, in the case of the above structure in which a large number of small holes are provided in the partition wall, the exhaust gas passes through the small holes in the partition wall, so that the exhaust sound energy can be attenuated to reduce the exhaust sound, but the exhaust resistance increases. This may affect the output.
In view of this, the present application aims to reduce exhaust noise energy without increasing exhaust resistance and to efficiently reduce exhaust noise.

上記課題を解決するため本願発明の排気マフラーに係る請求項１の発明は、内燃機関から延びる排気管の下流側に接続され、内部を隔壁により隔てて複数の膨張室を形成し、膨張室間をつなぐ連通管を備えた排気マフラーにおいて、
前記連通管が備えられた前記隔壁に前記排気管の開口端部に対向して多孔の吸音構造を設けたことを特徴とする。
In order to solve the above problems, the invention according to claim 1 relating to the exhaust muffler of the present invention is connected to the downstream side of the exhaust pipe extending from the internal combustion engine, and forms a plurality of expansion chambers with the inside being separated by a partition wall. In the exhaust muffler with a communication pipe that connects
The partition wall provided with the communication pipe is provided with a porous sound absorbing structure facing the open end of the exhaust pipe.

また、前記多孔の吸音構造が、パンチングプレートにより形成されるとともに、このパンチングプレートは前記隔壁の前方側へ配置され、かつこのパンチングプレートと前記隔壁の表面との間に空間を有することを特徴とする。
 Further , the porous sound absorbing structure is formed by a punching plate, the punching plate is disposed on the front side of the partition wall, and has a space between the punching plate and the surface of the partition wall. To do.

さらに、前記パンチングプレートは中央が前方に凸となる円弧状断面で、前記排気管の開口端部に対向する部分が最も前方へ突出する最突出部をなすとともにこの最突出部から外周側へ離れるにしたがって前記隔壁へ近接する形状をとり、外周部で隔壁へ接続し、前記排気管の開口端部における開口径よりも、パンチングプレートに設けられる前記吸音構造を構成する吸音孔の径がより小さく形成されるすることを特徴とする。
Furthermore, the punching plate has an arc-shaped cross section with a center projecting forward, and a portion facing the opening end of the exhaust pipe forms the most projecting portion projecting most forward and away from the most projecting portion to the outer peripheral side. The shape of the sound absorbing hole constituting the sound absorbing structure provided in the punching plate is smaller than the diameter of the opening at the opening end of the exhaust pipe. It is characterized by being formed .

請求項２は上記請求項１において、前記パンチングプレートにおける、前記排気管の開口端部に対向する位置の中心部から離れた位置に貫通部を設け、ここに前記連通管を貫通させて開口させたことを特徴とする。
In the second aspect the first aspect, in the punching plate, the through portion is provided at a position away from the center of the position opposed to the open end of the exhaust pipe, here by through the communicating pipe is opened It is characterized by that.

請求項１の発明によれば、連通管を備えた隔壁に、排気管の開口端部に対向して多孔の吸音構造を設けたので、排気ガス流が多孔の吸音構造へ接触することにより、排気音エネルギーが減衰される。このとき吸音構造の多孔部は排気ガスを通過させるためのものではないから、吸音構造による流動抵抗がほとんど発生せず、排気抵抗を増やさないので、出力に影響を与えずにかつ効果的に排気音のエネルギーを減衰して、排気音を低減できる。   According to the first aspect of the present invention, the partition provided with the communication pipe is provided with the porous sound absorbing structure facing the opening end of the exhaust pipe, so that the exhaust gas flow comes into contact with the porous sound absorbing structure, Exhaust sound energy is attenuated. At this time, since the porous part of the sound absorbing structure is not intended to allow exhaust gas to pass through, the flow resistance due to the sound absorbing structure hardly occurs and the exhaust resistance is not increased. Sound energy can be attenuated to reduce exhaust noise.

しかも、多孔の吸音構造が排気管の開口端部に対向する位置にあるので、最も排気音のエネルギーの大きいところに吸音構造を置き、排気音のエネルギーを効率良く減衰できる。   Moreover, since the porous sound absorbing structure is located at the position facing the opening end of the exhaust pipe, the sound absorbing structure can be placed where the energy of the exhaust sound is greatest, and the energy of the exhaust sound can be attenuated efficiently.

また、多孔の吸音構造をパンチングプレートにより容易かつ安価に形成できる。また、排気音のエネルギーの大きい場所の背後に空間を形成することにより、この空間がレゾネータ同様に機能するため、吸音効率が向上する。
 In addition , a porous sound absorbing structure can be easily and inexpensively formed with a punching plate. Further, by forming a space behind a place where the energy of exhaust sound is large, this space functions in the same way as a resonator, so that sound absorption efficiency is improved.

さらに、パンチングプレートを、排気管の開口端部に対向する部分が最も前方へ突出する最突出部をなし、この最突出部から外周側へ離れるにしたがって隔壁へ近接する立体形状としたので、空間の大きさを排気音のエネルギーに応じて変化させることができるとともに、この立体形状と外周部で隔壁へ接続させることとによりパンチングプレートの剛性を確保できる。
 Furthermore , the punching plate has a three-dimensional shape that has a portion that faces the opening end of the exhaust pipe that protrudes most forward, and is closer to the partition wall as it moves away from the outermost portion. Can be changed according to the energy of the exhaust sound, and the rigidity of the punching plate can be ensured by connecting the three-dimensional shape and the outer periphery to the partition wall.

請求項２の発明によれば、パンチングプレートにおける排気管の開口端部に対向する位置から離れた位置に貫通部を設け、ここに前記連通管を貫通させて開口させたので、多孔の吸音構造による吸音効果への影響を小さくして連通管を配置できる。また、排気管と連通管をそれぞれの開口が互いにずれて重ならないように配置できるので、吸音構造による排気音低減効果をより大きく発揮させることができる。 According to the invention of claim 2 , since the through portion is provided at a position away from the position facing the opening end portion of the exhaust pipe in the punching plate, and the communication pipe is opened therethrough, the porous sound absorbing structure is provided. The communication pipe can be arranged with a small influence on the sound absorption effect. Further, since the exhaust pipe and the communication pipe can be arranged so that the respective openings are not shifted and overlap each other, the exhaust noise reduction effect by the sound absorbing structure can be exhibited more greatly.

以下、図面に基づいて自動２輪車に適用された排気マフラーの実施例を説明する。図１は本願発明の適用された自動２輪車の側面を示す。エンジン１を支持する車体フレーム２はその前端部に設けられたヘッドパイプ３に左右一対のフロントフォーク４が回動自在に支持され、下端に支持された前輪５を上端部のハンドル６により操向する。   Hereinafter, an embodiment of an exhaust muffler applied to a motorcycle will be described based on the drawings. FIG. 1 shows a side view of a motorcycle to which the present invention is applied. The body frame 2 that supports the engine 1 has a pair of left and right front forks 4 rotatably supported by a head pipe 3 provided at the front end portion thereof, and a front wheel 5 supported at the lower end is steered by a handle 6 at the upper end portion. To do.

車体フレーム２は、エンジン１の上方をヘッドパイプ３から後方へ延びるメインフレーム７と、メインフレーム７の後端部に連続してエンジン１の後方を下方へ延びるセンターフレーム８と、ヘッドパイプ３からエンジン１の前方へ斜め下がり後方へ延びるダウンフレーム９及びメインフレーム７とセンターフレーム８の接続部から斜め上がりに後方へ延びる左右一対のシートレール１０並びにセンターフレーム８の下部とシートレール１０の後部間を連結するリヤステー１１を備える。   The vehicle body frame 2 includes a main frame 7 extending rearward from the head pipe 3 above the engine 1, a center frame 8 extending downward from the rear of the engine 1 continuously to the rear end of the main frame 7, and the head pipe 3. A down frame 9 that extends obliquely forward and backward to the front of the engine 1 and a pair of left and right seat rails 10 that extends rearward obliquely upward from a connecting portion of the main frame 7 and the center frame 8, and between the lower portion of the center frame 8 and the rear portion of the seat rail 10. The rear stay 11 is connected.

メインフレーム７、センターフレーム８及びダウンフレーム９はエンジン１を支持する。エンジン１は空冷４ストローク式であり、そのシリンダヘッド１２には気化器１３から混合気を吸気する。符号１４はエアクリーナである。また排気はシリンダヘッド１２の前面側から排気管１５を介して行われる。   The main frame 7, the center frame 8 and the down frame 9 support the engine 1. The engine 1 is an air-cooled four-stroke type, and the air-fuel mixture is sucked into the cylinder head 12 from the carburetor 13. Reference numeral 14 denotes an air cleaner. Exhaust is performed from the front side of the cylinder head 12 through the exhaust pipe 15.

排気管１５はシリンダヘッド１２からいったん前方へ出て後方へ屈曲し、エンジン１、センターフレーム８及びリヤステー１１の各側方を通って後方へ延び、シートレール１０の下方に配置された排気マフラー１６へ接続する。
排気マフラー１６はリヤステー１１とシートレール１０に支持され、後端部にて斜め下向きに開口するテールパイプ１７から車体後方へ排気する。 The exhaust pipe 15 once exits forward from the cylinder head 12 and bends backward. The exhaust pipe 15 extends rearward through the sides of the engine 1, the center frame 8 and the rear stay 11, and is disposed below the seat rail 10. Connect to.
The exhaust muffler 16 is supported by the rear stay 11 and the seat rail 10 and exhausts rearward from the tail pipe 17 that opens obliquely downward at the rear end.

排気マフラー１６の下方には後輪１８が位置し、この後輪１８はリヤアーム１９の後端部へ支持される。リヤアーム１９の前端は車体フレーム２に対して、センターフレーム８の下部に支持されたピボット軸８ａにて上下方向へ揺動自在に軸支され、リヤクッション（図示省略）にて緩衝される。   A rear wheel 18 is positioned below the exhaust muffler 16, and the rear wheel 18 is supported on the rear end portion of the rear arm 19. The front end of the rear arm 19 is pivotally supported by the pivot shaft 8a supported by the lower part of the center frame 8 with respect to the vehicle body frame 2 so as to be swingable in the vertical direction, and is buffered by a rear cushion (not shown).

後輪１８は同軸の後輪スプロケット１８ａとエンジン１の出力スプロケット１ａ間に巻き掛けられたチェーン１ｂにて駆動される。図中の符号６０はメインフレーム７上にて支持される燃料タンク、６１はシートレール１０上に支持されるタンデムシート、６２は燃料タンク６０の下部及びエンジン１上部の各側方を覆うシュラウド、６３はタンデムシート６１下方の車体左右を覆うサイドカバーであり、排気マフラー１６の前端部から後端部近傍にかけて上部側の側方を覆っている。   The rear wheel 18 is driven by a chain 1 b wound around a coaxial rear wheel sprocket 18 a and an output sprocket 1 a of the engine 1. In the figure, reference numeral 60 denotes a fuel tank supported on the main frame 7, 61 denotes a tandem seat supported on the seat rail 10, 62 denotes a shroud covering the lower side of the fuel tank 60 and the sides of the upper part of the engine 1, Reference numeral 63 denotes a side cover that covers the left and right sides of the vehicle body below the tandem seat 61 and covers the upper side from the front end portion of the exhaust muffler 16 to the vicinity of the rear end portion.

図２は排気マフラー１６の長さ方向断面を示す。この排気マフラー１６は後方（排気下流側、以下同じ）が拡径するステンレス等からなる適宜金属製の本体筒部２０と、その前後を覆うフロントキャップ２１、テールキャップ２２を備える。フロントキャップ２１には排気管１５の後端部と接続する小径のインテークパイプ２３が前後方向へ貫通し、後端側はより小径の延長パイプ２４に接続する。延長パイプ２４は支持プレート２５にて本体筒部２０内に支持され、後端は本体筒部２０の長さ方向略中央部近傍へ至っている。これらのインテークパイプ２３及び延長パイプ２４は排気管の一部を構成している。   FIG. 2 shows a longitudinal section of the exhaust muffler 16. The exhaust muffler 16 includes a metal main body cylinder portion 20 made of stainless steel whose diameter is increased at the rear (exhaust downstream side, the same applies hereinafter), a front cap 21 and a tail cap 22 covering the front and rear sides thereof. A small-diameter intake pipe 23 connected to the rear end portion of the exhaust pipe 15 penetrates the front cap 21 in the front-rear direction, and the rear end side is connected to a smaller-diameter extension pipe 24. The extension pipe 24 is supported in the main body cylinder portion 20 by the support plate 25, and the rear end reaches the vicinity of the central portion in the length direction of the main body cylinder portion 20. The intake pipe 23 and the extension pipe 24 constitute a part of the exhaust pipe.

排気マフラー１６内の支持プレート２５よりさらに後方部分は第１隔壁２６、第２隔壁２７にて区画され、フロントキャップ２１と第１隔壁２６の間に第１膨張室２９、第１隔壁２６と第２隔壁２７の間に第３膨張室３０、第２隔壁２７とテールキャップ２２の間に第２膨張室３１が形成される。   A portion further rearward than the support plate 25 in the exhaust muffler 16 is partitioned by a first partition wall 26 and a second partition wall 27, and the first expansion chamber 29, the first partition wall 26 and the first partition wall 26 are interposed between the front cap 21 and the first partition wall 26. A third expansion chamber 30 is formed between the two partition walls 27, and a second expansion chamber 31 is formed between the second partition wall 27 and the tail cap 22.

なお、支持プレート２５よりも前方の空間２８は、支持プレート２５に設けられた開口部４４（図５）により後方側の空間と連通し、単一の第１膨張室２９をなす。支持プレート２５については後述する。テールキャップ２２は後方へ向かってすぼまる略円錐台形状をなし、その下方斜面をテールパイプ１７が貫通して第３膨張室３０と外気を連通している。   The space 28 in front of the support plate 25 communicates with the space on the rear side through an opening 44 (FIG. 5) provided in the support plate 25 to form a single first expansion chamber 29. The support plate 25 will be described later. The tail cap 22 has a substantially frustoconical shape that narrows toward the rear, and the tail pipe 17 penetrates the lower slope of the tail cap 22 to communicate the third expansion chamber 30 with the outside air.

インテークパイプ２３は空間２８を通過し、その後端に接続する延長パイプ２４は第１膨張室２９後部内の略軸心部かつ第１隔壁２６の前方に開口する。第１膨張室２９内には第１隔壁２６を貫通する第１連通管３２の前端が開口する。第１連通管３２は第３膨張室３０を通過し、その後端は第２隔壁２７を貫通して第２膨張室３１内へ開口する。   The intake pipe 23 passes through the space 28, and the extension pipe 24 connected to the rear end of the intake pipe 23 opens substantially in the center of the rear portion of the first expansion chamber 29 and in front of the first partition wall 26. In the first expansion chamber 29, the front end of the first communication pipe 32 that penetrates the first partition wall 26 opens. The first communication pipe 32 passes through the third expansion chamber 30, and its rear end passes through the second partition wall 27 and opens into the second expansion chamber 31.

第２膨張室３１は第２隔壁２７を貫通する第２連通管３３を介して第３膨張室３０と連通する。第２連通管３３は第３膨張室３０及び第２膨張室３１の双方へ開口している。第３膨張室３０には第２隔壁２７を貫通するテールパイプ１７の前端が開口する。   The second expansion chamber 31 communicates with the third expansion chamber 30 via a second communication pipe 33 that penetrates the second partition wall 27. The second communication pipe 33 opens to both the third expansion chamber 30 and the second expansion chamber 31. The front end of the tail pipe 17 that passes through the second partition wall 27 is opened in the third expansion chamber 30.

排気ガスは矢示するように、インテークパイプ２３、延長パイプ２４から第１膨張室２９へ出て膨張し、続いて第１連通管３２から後方へ流れて第２膨張室３１へ出て再び膨張し、さらに第２連通管３３にて前方へＵターンして流れ、第３膨張室３０へ出て再び膨張し、その後、再びＵターンしてテールパイプ１７内を後方へ流れ、外気へ排出される。３４は本体筒部２０に溶接されたステーであり、ここでシートレール側へ支持される。第１隔壁２６にはその前面側に吸音板３５が設けられている。   As shown by the arrow, the exhaust gas exits from the intake pipe 23 and the extension pipe 24 to the first expansion chamber 29 and expands, and then flows backward from the first communication pipe 32 to the second expansion chamber 31 and expands again. Further, the second communication pipe 33 makes a U-turn forward and flows, then exits the third expansion chamber 30 and expands again. Then, it makes a U-turn again and flows backward in the tail pipe 17 and is discharged to the outside air. The Reference numeral 34 denotes a stay welded to the main body cylinder portion 20 and is supported to the seat rail side here. The first partition wall 26 is provided with a sound absorbing plate 35 on the front side thereof.

図３は図２の第１隔壁２６部分を拡大した図である。吸音板３５は中央が前方へ凸の円弧状断面をなす凸曲面をなし、延長パイプ２４の開口部に対面する部分であり、かつ延長パイプ２４の中心軸線Ｃ上となる位置が最も前方へ凸となる、頂点状の最突出部３５ａになっている。この部分が排気ガス流に対向する位置の中心部をなす。この部分を含む所定範囲に多数の小孔からなる吸音孔３６（指示符号は一部のみを代表的に示す）が形成されている。   FIG. 3 is an enlarged view of the first partition wall 26 portion of FIG. The sound absorbing plate 35 has a convex curved surface with an arcuate cross section whose center is convex forward, is a portion facing the opening of the extension pipe 24, and the position on the central axis C of the extension pipe 24 is the most convex forward It becomes the apex-like most protruding part 35a. This portion forms the center of the position facing the exhaust gas flow. A sound absorbing hole 36 (indicated by only a part of the symbols) is formed in a predetermined range including this portion.

吸音板３５の上部には切り欠き３７が形成され、ここに第１連通管３２を貫通させてその前端を前方へ突出させ、この状態で吸音板３５を第１隔壁２６の前面へ重ねて溶接一体化している。切り欠き３７は第１連通管３２の貫通部をなし、切り欠き状の他に貫通穴等が可能である。切り欠き３７は吸音板３５の外周部近傍に位置する。この位置は排気ガス流に対向する位置の中心部、すなわち最突出部３５ａから最も径方向へ離れた位置とし、第１連通管３２の開口と延長パイプ２４の開口とが互いに重ならないようにずらして配置されている。   A notch 37 is formed in the upper portion of the sound absorbing plate 35, and the front end of the first communicating pipe 32 is projected forward through the notch 37. In this state, the sound absorbing plate 35 is overlapped on the front surface of the first partition wall 26 and welded. It is integrated. The cutout 37 is a through portion of the first communication pipe 32, and a through hole or the like is possible in addition to the cutout shape. The notch 37 is located near the outer periphery of the sound absorbing plate 35. This position is the center of the position facing the exhaust gas flow, that is, the position furthest away from the most protruding portion 35a in the radial direction, and is shifted so that the opening of the first communication pipe 32 and the opening of the extension pipe 24 do not overlap each other. Are arranged.

吸音板３５と第１隔壁２６の間には空間４０が形成される。この空間４０の前後方向幅（吸音板３５と第１隔壁２６の表面との間隔ｄ）は、延長パイプ２４の後端開口に対面する範囲が最も拡大され、延長パイプ２４から遠くなる吸音板３５の外周部へ向かうほど次第に狭くなる。この空間４０の前後方向幅は吸音板３５の曲面に応じて連続的に変化する。吸音孔３６を形成した吸音板３５及び空間４０は本願発明における吸音構造の一例をなす。   A space 40 is formed between the sound absorbing plate 35 and the first partition wall 26. The width of the space 40 in the front-rear direction (the distance d between the sound absorbing plate 35 and the surface of the first partition wall 26) is widened most in the range facing the rear end opening of the extension pipe 24 and is farther from the extension pipe 24. It becomes narrower gradually toward the outer peripheral part. The width of the space 40 in the front-rear direction changes continuously according to the curved surface of the sound absorbing plate 35. The sound absorbing plate 35 and the space 40 in which the sound absorbing holes 36 are formed constitute an example of a sound absorbing structure in the present invention.

吸音板３５下部には凹部３８が形成され、その下方で第１隔壁２６に切り欠き３９が形成されている。切り欠き３９は第１膨張室２９と第３膨張室３０を連通して液抜き穴となっている。   A recess 38 is formed in the lower part of the sound absorbing plate 35, and a notch 39 is formed in the first partition wall 26 below the recess 38. The notch 39 communicates the first expansion chamber 29 and the third expansion chamber 30 to form a liquid drain hole.

図４は図２の４−４線断面を示す。吸音板３５は、上部の貫通孔３７と下部の凹部３８間を結ぶ直径方向に沿って多数の吸音孔３６が、全体として上下方向に長い略帯状の範囲内に形成されている。吸音孔３６の形成範囲は延長パイプ２４から出た排気ガス流に対面する部分であり、その中心である最突出部３５ａを含む延長パイプ２４の端部開口と対面する部分（仮想線で示す２４）からその上下方向へ広がっている。   4 shows a cross section taken along line 4-4 of FIG. In the sound absorbing plate 35, a large number of sound absorbing holes 36 are formed in a substantially band-like range extending in the vertical direction as a whole along the diameter direction connecting the upper through hole 37 and the lower concave portion 38. The formation range of the sound absorbing hole 36 is a portion facing the exhaust gas flow coming out of the extension pipe 24 and a portion facing the end opening of the extension pipe 24 including the most projecting portion 35a which is the center (24 indicated by a virtual line). ) And its vertical direction.

吸音板３５はパンチングメタル製であり、ロール掛けにて帯状に形成すると同時に吸音孔３６を形成したパンチングプレートに対して、上方の切り欠き３７及びに下方の凹部３８を一体にプレス成形し、全体として前方へ凸に湾曲する凸曲面状の立体形状に成形され、適宜な金属から形成される。凹部３８から見える切り欠き３９は第１隔壁２６の下部に円弧状をなして形成され、本体筒部２０の内面との間に若干の空間を形成している。   The sound absorbing plate 35 is made of punching metal, and is formed into a band shape by rolling and simultaneously press-molded with an upper notch 37 and a lower recess 38 integrally with a punching plate in which a sound absorbing hole 36 is formed. Are formed into a three-dimensional shape having a convex curved surface that curves forward and formed from a suitable metal. The notch 39 visible from the recess 38 is formed in an arc shape below the first partition wall 26, and forms a slight space between the inner surface of the main body cylinder portion 20.

吸音孔３６は仮想線で示す延長パイプ２４の端部開口と対面する部分に形成すれば足り、この部分に設けることがレゾネータ効果を有効に発揮する観点より好ましい。しかし、実際はパンチング成形の都合により帯状に長く分布して形成されている（パンチング範囲を図３中にＡとして示す）。なお、吸音孔３６の形成範囲や、吸音孔３６のサイズ、個数等は任意に設定できる。   It is sufficient that the sound absorbing hole 36 is formed at a portion facing the end opening of the extension pipe 24 indicated by an imaginary line, and it is preferable to provide the sound absorbing hole 36 from the viewpoint of effectively exhibiting the resonator effect. However, in actuality, it is long and distributed in the form of a band due to the convenience of punching molding (the punching range is shown as A in FIG. 3). The formation range of the sound absorbing holes 36, the size and number of the sound absorbing holes 36, and the like can be arbitrarily set.

図５は図２の５−５線断面を示す。支持プレート２５は延長パイプ２４が貫通する中央部４１と外周部４２を放射方向の連結腕部４３で連結し、その間に大きな開口４４が形成されている。これらの開口４４により支持プレート２５の前方空間２８を後方の空間と連通して第１膨張室２９を形成している。   FIG. 5 shows a cross section taken along line 5-5 of FIG. The support plate 25 connects a central portion 41 and an outer peripheral portion 42 through which the extension pipe 24 passes by a connecting arm portion 43 in the radial direction, and a large opening 44 is formed therebetween. These openings 44 communicate the front space 28 of the support plate 25 with the rear space to form a first expansion chamber 29.

下部の連結腕部４３には切り欠き３９と同形・同寸の切り欠き４５が液抜き穴として形成され、支持プレート２５の前後の空間を連通している。   A cutout 45 having the same shape and the same size as the cutout 39 is formed as a liquid drainage hole in the lower connecting arm portion 43, and communicates the space before and after the support plate 25.

図６は、図２の６−６線断面を示す。第２隔壁２７は直径上にて上方から下方へ第１連通管３２、テールパイプ１７及び第２連通管３３の各開口がこの順で並び、下部には切り欠き３９と同形・同寸の切り欠き４６が形成されて液抜き穴となっている。   6 shows a cross section taken along line 6-6 of FIG. In the second partition wall 27, the openings of the first communication pipe 32, the tail pipe 17 and the second communication pipe 33 are arranged in this order from the upper side to the lower side in the diameter, and the lower part is cut in the same shape and the same size as the notch 39. A notch 46 is formed to form a liquid drain hole.

次に本実施例の作用を説明する。図２において排気ガスがインテークパイプ２３及び延長パイプ２４を通して第１膨張室２９内へ出て膨張する。このとき最も排気ガスの排気音エネルギーが大きい場所は、延長パイプ２４の後端開口の後方となる、最突出部３５ａを含む吸音板３５上における排気ガス流に対面する部分となる。ところで、この部分には図３に示すように、吸音孔３６が形成されているため、排気ガスが吸音板３５と接触することにより吸音孔３６によって排気音エネルギーが減衰し、排気音が低減する。   Next, the operation of this embodiment will be described. In FIG. 2, the exhaust gas passes through the intake pipe 23 and the extension pipe 24 into the first expansion chamber 29 and expands. At this time, the place where the exhaust sound energy of the exhaust gas is the largest is a portion facing the exhaust gas flow on the sound absorbing plate 35 including the most projecting portion 35a, which is behind the rear end opening of the extension pipe 24. By the way, as shown in FIG. 3, the sound absorbing hole 36 is formed in this portion. Therefore, when the exhaust gas comes into contact with the sound absorbing plate 35, the exhaust sound energy is attenuated by the sound absorbing hole 36, and the exhaust sound is reduced. .

このとき、図３にて明瞭に示すように、吸音板３５の背面と第１隔壁２６の間に空間４０が形成されており、この空間４０が吸音孔３６を通して一種のレゾネータとして機能するから、さらに効率的に排気音を低減できる。また、この空間４０の大きさは排気音のエネルギーが最も大きい排気ガス流に対面する部分の中心、すなわち最突出部３５ａの近傍部が最も大きく、排気音のエネルギーが小さくなる外周側にむかって次第に小さくなるから、空間４０を必要な.大きさになるよう効率的に形成できる。   At this time, as clearly shown in FIG. 3, a space 40 is formed between the back surface of the sound absorbing plate 35 and the first partition wall 26, and this space 40 functions as a kind of resonator through the sound absorbing hole 36. Furthermore, exhaust noise can be reduced efficiently. The size of the space 40 is the center of the portion facing the exhaust gas flow having the largest exhaust sound energy, that is, the vicinity of the most protruding portion 35a is the largest, and toward the outer peripheral side where the energy of the exhaust sound is small. Since the space 40 is gradually reduced, the space 40 can be efficiently formed to have the required size.

しかも、吸音孔３６は排気ガス流に対面する部分を含んで形成されているため、最も排気音エネルギーの大きな部分のみを効率的に吸収できる。また、吸音板３５が固定される第１隔壁２６には第１連通管３２が貫通して開口している。このため、吸音板３５を設けない場合と同程度の必要な排気流量が確保されていることになり、しかも吸音板３５及びその吸音孔３６はほとんど排気ガスに対して排気抵抗を発生させないから、吸音板３５からなる吸音構造を設けても排気抵抗を従来より増大させることもない。   Moreover, since the sound absorbing hole 36 is formed to include a portion facing the exhaust gas flow, only the portion having the largest exhaust sound energy can be efficiently absorbed. The first communication pipe 32 is opened through the first partition wall 26 to which the sound absorbing plate 35 is fixed. For this reason, the necessary exhaust flow rate equivalent to the case where the sound absorbing plate 35 is not provided is secured, and the sound absorbing plate 35 and the sound absorbing hole 36 hardly generate exhaust resistance against the exhaust gas. Even if a sound absorbing structure composed of the sound absorbing plate 35 is provided, the exhaust resistance is not increased as compared with the prior art.

そのうえ、吸音板３５をパンチングプレート製としたので、多孔の吸音構造をパンチングプレートにより容易かつ安価に形成できる。また、空間４０を形成するよう凸に湾曲する立体形状の曲面とすること、並びに外周部で第１隔壁２６へ接続させることとにより、パンチングプレートである吸音板３５の剛性も確保できる。   In addition, since the sound absorbing plate 35 is made of a punching plate, a porous sound absorbing structure can be easily and inexpensively formed by the punching plate. In addition, the sound absorbing plate 35, which is a punching plate, can be secured by forming a three-dimensional curved surface that is convexly curved so as to form the space 40, and connecting the first partition wall 26 to the outer peripheral portion.

また、吸音板３５の排気流に対向する位置の中心部から離れた位置である外周部に切り欠き３７を設け、ここに第１連通管３２を貫通させて開口させたので、吸音効果への影響を小さくして第１連通管３２を配置できる。また排気管の一部をなす延長パイプ２４と第１連通管３２の半径方向の位置を、互いの開口が重ならないようにずらすことになるので、吸音構造による排気音低減効果をより大きく発揮させることができる。
In addition, since the notch 37 is provided in the outer peripheral portion which is a position away from the center portion of the sound absorbing plate 35 facing the exhaust flow, and the first communication pipe 32 is opened through the notch 37, the sound absorbing effect is improved. The first communication pipe 32 can be arranged with reduced influence. Further, since the radial positions of the extension pipe 24 and the first communication pipe 32 that form a part of the exhaust pipe are shifted so that the openings do not overlap with each other, the exhaust sound reduction effect by the sound absorption structure is further exerted. be able to.

図７は、この消音効果を示すグラフであり、横軸に排気音の周波数、縦軸に音量（ｄＢ）をとったものであり、排気音の周波数を所定範囲毎に区分し、各区分毎に測定された平均音量を示す。この図において、上側のグラフが吸音板３５を設けない従来例であり、下側が本願発明である。両グラフ間の斜線部が排気音の低減程度を示す。この図より、本実施例においては比較的広い周波数範囲において排気音の低減を図ることができたことが判る。   FIG. 7 is a graph showing the silencing effect. The horizontal axis represents the exhaust sound frequency and the vertical axis represents the volume (dB). The exhaust sound frequency is divided into predetermined ranges. Shows the measured average volume. In this figure, the upper graph is a conventional example in which the sound absorbing plate 35 is not provided, and the lower graph is the present invention. The shaded area between the two graphs indicates the degree of reduction in exhaust noise. From this figure, it can be seen that in this embodiment, the exhaust noise can be reduced in a relatively wide frequency range.

図８は別実施例に係る図３と同様部位を示す。この例では、図３における吸音構造の空間４０内へグラスウール等の吸音材４７を充填したものである。吸音材４７はグラスウール以外にもステンレススチールウールやセラミックウール等が使用できる。また、セラミックや金属の多孔質ブロック体等の吸音材を挟んでも良い。このようにするとさらに吸音効率を上げることも可能になる。   FIG. 8 shows the same part as FIG. 3 according to another embodiment. In this example, the sound absorbing material 47 such as glass wool is filled in the space 40 of the sound absorbing structure in FIG. As the sound absorbing material 47, stainless steel wool, ceramic wool or the like can be used besides glass wool. Further, a sound absorbing material such as a ceramic or metal porous block may be sandwiched. In this way, it is possible to further increase the sound absorption efficiency.

図９は吸音構造に関する参考例について、図３と同様部位を示す。この例では吸音部５０は、第１隔壁２６より前方へ突出する多数の突起５１からなる。突起５１は金属等の適宜材料より第１隔壁２６と一体又は別体に形成され、隣り合う突起５１の間に狭い通路状をなす多数の間隙５２が前方へ開放されて形成されている。
FIG. 9 shows a portion similar to FIG. 3 for a reference example regarding the sound absorbing structure . In this example, the sound absorbing portion 50 includes a large number of protrusions 51 protruding forward from the first partition wall 26. The protrusions 51 are formed integrally or separately from the first partition wall 26 from an appropriate material such as a metal, and a large number of gaps 52 that form narrow passages are formed forwardly between adjacent protrusions 51.

このようにしても、各突起５１間の間隙５２が多数の吸音孔３６と同様に機能し、これらの間隙５２を通して排気ガスが第２膨張室２９と第１隔壁２６の間を往復することにより排気音エネルギーを減衰させることができる。したがって、このような吸音部５０も多孔の吸音構造の一例をなす。   Even in this case, the gaps 52 between the projections 51 function in the same manner as the sound absorbing holes 36, and the exhaust gas reciprocates between the second expansion chamber 29 and the first partition wall 26 through these gaps 52. Exhaust sound energy can be attenuated. Therefore, such a sound absorbing portion 50 is also an example of a porous sound absorbing structure.

なお、本願発明は上記の各実施例に限定されるものではなく、発明の原理内において種々に変形や応用が可能である。例えば、吸音板３５を多数重ねる多重構造として、剛性を大きくしても良い。この場合には、各吸音板３５間に空間を設けるようにしてよく、設けなくてもよい。また吸音板３５の形成はパンチングメタルとすれば安価かつ容易に形成できるが、アルミダイキャスト等の他の任意形成方法を採用できる。また、多孔質のセラミックを配置してもよい。さらに、自動２輪車に限らず、各種内燃機関における排気マフラーに適用できる。   The present invention is not limited to the above embodiments, and various modifications and applications are possible within the principle of the invention. For example, the rigidity may be increased as a multiple structure in which many sound absorbing plates 35 are stacked. In this case, a space may be provided between the respective sound absorbing plates 35, or may not be provided. The sound absorbing plate 35 can be formed inexpensively and easily by using a punching metal, but other arbitrary forming methods such as aluminum die casting can be adopted. Moreover, you may arrange | position a porous ceramic. Furthermore, the present invention can be applied not only to motorcycles but also to exhaust mufflers in various internal combustion engines.

本願発明が適用された自動２輪車の側面図Side view of a motorcycle to which the present invention is applied 実施例に係る排気マフラーの長さ方向図断面図Exhaust muffler according to the embodiment length direction sectional view 吸音板部分の拡大断面図Expanded cross section of the sound absorbing plate 図２の４−４線断面図Sectional view along line 4-4 in FIG. 図２の５−５線断面図Sectional view along line 5-5 in FIG. 図２の６−６線断面図Sectional view along line 6-6 in FIG. 効果を示すグラフEffect graph 別実施例に係る図３と同様部位を示す図The figure which shows the site | part similar to FIG. 3 which concerns on another Example 参考例に係る図３と同様部位を示す図 The figure which shows the site | part similar to FIG. 3 which concerns on a reference example

符号の説明Explanation of symbols

１：エンジン、１２：シリンダヘッド、１５：排気管、１６：排気マフラー、２０：本体筒部、２１：フロントキャップ、２２：テールキャップ、２３：インテークパイプ（排気管の一部）、２４：延長パイプ（排気管の一部）、２５：支持プレート、２６：第１隔壁、２７：第２隔壁、２９：第１膨張室、３０：第３膨張室、３１：第２膨張室、３２：第１連通管、３３：第２連通管、３５：吸音板、３６：吸音孔、４０：空間、４５：開口、５０：吸音部、５１：突起
1: engine, 12: cylinder head, 15: exhaust pipe, 16: exhaust muffler, 20: main body cylinder, 21: front cap, 22: tail cap, 23: intake pipe (part of exhaust pipe), 24: extension Pipe (part of exhaust pipe), 25: support plate, 26: first partition, 27: second partition, 29: first expansion chamber, 30: third expansion chamber, 31: second expansion chamber, 32: second 1 communication pipe, 33: second communication pipe, 35: sound absorbing plate, 36: sound absorbing hole, 40: space, 45: opening, 50: sound absorbing portion, 51: protrusion

Claims (5)

内燃機関から延びる排気管の下流側に接続され、内部を隔壁により隔てて複数の膨張室を形成し、膨張室間をつなぐ連通管を備えた排気マフラーにおいて、
前記連通管（３２）が備えられた前記隔壁（２６）に前記排気管（２４）の開口端部に対向して多孔の吸音構造を設けるとともに、
この多孔の吸音構造は、パンチングプレート（３５）により形成され、このパンチングプレート（３５）は前記隔壁（２６）の前方側へ配置され、かつこのパンチングプレート（３５）と前記隔壁（２６）の表面との間に空間（４０）を有し、
前記パンチングプレート（３５）は、中央が前方に凸となる円弧状断面で、前記排気管（２４）の開口端部に対向する部分が最も前方へ突出する最突出部（３５ａ）をなすとともにこの最突出部（３５ａ）から外周側へ離れるにしたがって前記隔壁（２６）へ近接する形状をとり、外周部で隔壁（２６）へ接続し、
排気管（２４）の開口端部における開口径よりも、パンチングプレート（３５）に設けられる前記吸音構造を構成する吸音孔（３６）の径がより小さく形成されることを特徴とする排気マフラー。 In an exhaust muffler that is connected to the downstream side of an exhaust pipe extending from an internal combustion engine, forms a plurality of expansion chambers separated by a partition wall, and includes a communication pipe that connects the expansion chambers.
The partition wall (26) provided with the communication pipe (32) is provided with a porous sound absorbing structure facing the open end of the exhaust pipe (24) , and
Sound absorbing structure of the porous is formed by punching plate (35), the surface of the punching plate (35) wherein is disposed toward the front of the partition wall (26), and this punching plate (35) bulkhead (26) A space (40) between and
The punching plate (35) has an arcuate cross section whose center is convex forward, and the portion facing the opening end of the exhaust pipe (24) forms the most projecting portion (35a) that projects forward most. takes the shape proximate said to bulkhead (26) with distance to the outer peripheral side from the protruding section (35a), connected to the partition wall (26) at the outer peripheral portion,
An exhaust muffler characterized in that the diameter of the sound absorbing hole (36) constituting the sound absorbing structure provided in the punching plate (35) is smaller than the opening diameter at the opening end of the exhaust pipe (24) . 前記パンチングプレート（３５）における、前記排気管（２４）の開口端部に対向する位置の中心部（３５ａ）から離れた位置に貫通部（３７）を設け、ここに前記連通管（３２）を貫通させて開口させたことを特徴とする請求項１記載の排気マフラー。 In the punching plate (35) , a through portion (37) is provided at a position away from the central portion (35a) at a position facing the opening end of the exhaust pipe (24) , and the communication pipe (32) is provided here. The exhaust muffler according to claim 1, wherein the exhaust muffler is penetrated and opened. 前記パンチングプレート（３５）は対向する前記排気管（２４）の中心軸線方向（Ｃ）から見て略円形であり、このパンチングプレート（３５）の直径方向に前記吸音孔（３６）が略帯状に配置されるとともに、この吸音孔（３６）が略帯状に配置される方向のパンチングプレート端部に、前記排気管（２４）側から前記隔壁（２６）が見える切り欠き（３７）又は凹部（３８）が形成されることを特徴とする請求項１又は２に記載した排気マフラー。The punching plate (35) is substantially circular when viewed from the central axis direction (C) of the exhaust pipe (24) facing the sound, and the sound absorbing holes (36) are formed in a strip shape in the diameter direction of the punching plate (35). At the end of the punching plate in the direction in which the sound absorption holes (36) are arranged in a substantially band shape, a notch (37) or a recess (38) where the partition wall (26) can be seen from the exhaust pipe (24) side. The exhaust muffler according to claim 1 or 2, wherein the exhaust muffler is formed. 前記パンチングプレート（３５）における前記排気管（２４）の開口端部に対向する部分内に前記最突出部（３５ａ）と複数の前記吸音孔（３６）が配置されるとともに、この排気管（２４）の開口端部に対向する部分を挟んでかつ重ならない位置に前記切り欠き（３７）又は凹部（３８）が形成されることを特徴とする請求項３に記載した排気マフラー。The most projecting portion (35a) and the plurality of sound absorbing holes (36) are disposed in a portion of the punching plate (35) facing the opening end portion of the exhaust pipe (24), and the exhaust pipe (24 The exhaust muffler according to claim 3, wherein the notch (37) or the recess (38) is formed at a position that does not overlap with a portion facing the opening end portion of). 前空間（４０）内に吸音材（４７）を充填したことを特徴とする請求項１〜４のいずれかに記載した排気マフラー。The exhaust muffler according to any one of claims 1 to 4, wherein the front space (40) is filled with a sound absorbing material (47).
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