JP2001073740A - Muffler for motorcylce - Google Patents
Muffler for motorcylceInfo
- Publication number
- JP2001073740A JP2001073740A JP24598399A JP24598399A JP2001073740A JP 2001073740 A JP2001073740 A JP 2001073740A JP 24598399 A JP24598399 A JP 24598399A JP 24598399 A JP24598399 A JP 24598399A JP 2001073740 A JP2001073740 A JP 2001073740A
- Authority
- JP
- Japan
- Prior art keywords
- muffler
- exhaust gas
- expansion chamber
- pipe
- expansion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する利用分野】本発明は、マフラー本体内に
膨張室を複数設けた自動二輪車用マフラーに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for a motorcycle having a plurality of expansion chambers in a muffler body.
【０００２】[0002]
【従来の技術】従来、自動二輪車のマフラーは、マフラ
ー本体内に膨張室を複数設け、いわゆる多段膨張式の構
造を採っている。例えば、マフラー本体の後端部に第１
の膨張室を形成するとともに、マフラー本体の前端部に
第２の膨張室を形成し、これら両膨張室どうしの間に形
成した第３の膨張室からマフラー本体外に排ガスを排出
する構造を採っている。2. Description of the Related Art Conventionally, a muffler for a motorcycle has a so-called multi-stage expansion structure in which a plurality of expansion chambers are provided in a muffler body. For example, the first end of the muffler body
And a second expansion chamber is formed at the front end of the muffler main body, and exhaust gas is discharged out of the muffler main body from the third expansion chamber formed between the two expansion chambers. ing.
【０００３】前記第１の膨張室は、マフラー本体の前端
部から膨張室間の隔壁を貫通して延びる排ガス流入管に
よって排ガスが導かれ、第２の膨張室は、膨張室間の隔
壁を貫通する連通管によって排ガスが導かれる。また、
第３の膨張室は、第２の膨張室との間の隔壁を貫通する
連通管によって排ガスが導かれ、第１の膨張室との間の
隔壁を貫通する排ガス排出管によって排ガスが排出され
る。この排ガス排出管は、第１の膨張室内を後方に延
び、マフラー本体の後端壁を貫通してマフラー本体外に
延出している。In the first expansion chamber, exhaust gas is guided by an exhaust gas inflow pipe extending from a front end of the muffler main body through a partition between the expansion chambers, and a second expansion chamber passes through the partition between the expansion chambers. The exhaust gas is guided by the communicating pipe. Also,
Exhaust gas is guided to the third expansion chamber by a communication pipe penetrating a partition wall between the third expansion chamber and the second expansion chamber, and exhaust gas is discharged by an exhaust gas discharge pipe penetrating a partition wall between the third expansion chamber and the first expansion chamber. . The exhaust gas discharge pipe extends rearward in the first expansion chamber, penetrates a rear end wall of the muffler body, and extends outside the muffler body.
【０００４】[0004]
【発明が解決しようとする課題】しかるに、このように
構成した従来の自動二輪車用マフラーにおいては、マフ
ラー本体内に配設した管体の熱膨張が問題であった。例
えば、排ガス流入管の基端部をマフラー本体に固定し、
第１の膨張室と第３の膨張室の間の隔壁に排ガス流入管
の先端部を固定すると、この排ガス流入管が熱膨張で伸
びることによって前記隔壁が変形し、第１の膨張室と第
３の膨張室とを連通する隙間が形成されてしまうことが
あるからである。However, in the conventional muffler for a motorcycle constructed as described above, the thermal expansion of a pipe disposed in the muffler body is a problem. For example, fix the base end of the exhaust gas inflow pipe to the muffler body,
When the distal end of the exhaust gas inflow pipe is fixed to the partition wall between the first expansion chamber and the third expansion chamber, the partition wall is deformed by the expansion of the exhaust gas inflow pipe due to thermal expansion, and the first expansion chamber and the third expansion chamber are deformed. This is because a gap communicating with the third expansion chamber may be formed.
【０００５】第１の膨張室内の圧力は第３の膨張室内の
圧力より高いから、上述したように隙間が形成される
と、第１の膨張室内の排ガスが第２の膨張室を通ること
なく第３の膨張室に流入し、消音性能が低下してしま
う。このことは、前記排ガス排出管や連通管についても
当てはまる。Since the pressure in the first expansion chamber is higher than the pressure in the third expansion chamber, when the gap is formed as described above, the exhaust gas in the first expansion chamber does not pass through the second expansion chamber. It flows into the third expansion chamber, and the noise reduction performance is reduced. This is also true for the exhaust gas discharge pipe and the communication pipe.
【０００６】上述した不具合は、第１の膨張室と第３の
膨張室の間の隔壁に対して管体が移動自在に保持すると
ともに、この隔壁に管体を接続する部分から排ガスが漏
洩することがない支持構造を採用することによって解消
することはできる。しかしながら、このような支持構造
を採用すると製造コストが高くなってしまう。[0006] The above-described problem is caused by the fact that the pipe is held movably with respect to the partition between the first expansion chamber and the third expansion chamber, and the exhaust gas leaks from the portion connecting the pipe to the partition. The problem can be solved by adopting a support structure that does not have any problem. However, adopting such a support structure increases the manufacturing cost.
【０００７】本発明は、このような問題点を解消するた
めになされたもので、コストダウンを図りながら、消音
性能が高い多段膨張式の自動二輪車用マフラーを提供す
ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a muffler for a multi-stage inflatable motorcycle having high noise reduction performance while reducing costs.
【０００８】[0008]
【課題を解決するための手段】この目的を達成するため
に本発明に係る自動二輪車用マフラーは、マフラー本体
内に膨張室を車体の前後方向に一列に並べ、マフラー本
体前端部から膨張室間の隔壁を貫通して最後端の膨張室
まで延びる排ガス流入管と、最前端の膨張室から前記隔
壁およびマフラー本体後端壁を貫通してマフラー外に延
びる排ガス排出管とを設け、隣接する膨張室どうしを互
いに連通させ、前記両管体におけるマフラー本体を貫通
する基端部をマフラー本体に溶接するとともに、マフラ
ー本体内に位置する先端部側を、この先端部が位置する
膨張室の隔壁に摺動自在に保持させたものである。In order to achieve this object, a muffler for a motorcycle according to the present invention has expansion chambers arranged in a line in a front-rear direction of a vehicle body in a muffler main body, and a space between the front end of the muffler main body and the expansion chamber. An exhaust gas inflow pipe extending through the partition wall to the rearmost expansion chamber, and an exhaust gas discharge pipe extending from the frontmost expansion chamber through the partition wall and the rear end wall of the muffler body to the outside of the muffler. The chambers are communicated with each other, and the base ends of the two pipes that penetrate the muffler body are welded to the muffler body, and the distal end side located in the muffler main body is used as a partition wall of the expansion chamber where the distal end is located. It is slidably held.
【０００９】本発明によれば、膨張室を膨張段数の順に
一列に並べているから、膨張室どうしの間の隔壁を排ガ
ス流入管または排ガス排出管が貫通する部分に形成され
る隙間を通って排ガスが漏洩したとしても、この漏洩し
た排ガスは次の膨張段数の膨張室に流入する。したがっ
て、排ガス流入管や排ガス排出管を摺動自在に保持する
部分に気密性が高く高価なシール構造を採用しなくてよ
い。According to the present invention, since the expansion chambers are arranged in a line in the order of the number of expansion stages, the partition wall between the expansion chambers passes through a gap formed at a portion through which the exhaust gas inflow pipe or the exhaust gas exhaust pipe penetrates. Leaks, the leaked exhaust gas flows into the expansion chamber of the next expansion stage. Therefore, an expensive seal structure with high airtightness does not need to be adopted in a portion that slidably holds the exhaust gas inflow pipe and the exhaust gas exhaust pipe.
【００１０】[0010]
【発明の実施の形態】以下、本発明に係る自動二輪車用
マフラーの一実施の形態を図１ないし図５によって詳細
に説明する。図１は本発明に係る自動二輪車用マフラー
の側面図、図２はマフラー本体の縦断面図、図３は図２
におけるIII−III線断面図、図４は図２におけるIV−IV
線断面図、図５は図２におけるV−V線断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a muffler for a motorcycle according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view of a muffler for a motorcycle according to the present invention, FIG. 2 is a longitudinal sectional view of a muffler body, and FIG.
FIG. 4 is a sectional view taken along line III-III in FIG.
FIG. 5 is a sectional view taken along line VV in FIG.
【００１１】これらの図において、符号１で示すもの
は、この実施の形態による自動二輪車用マフラーであ
る。このマフラー１は、ユニットスイング式エンジン２
に使用するもので、シリンダヘッド２ａの排気口に接続
して車体の後方に延びる排気管３と、この排気管３の後
端部に接続したマフラー本体４とから構成している。In these figures, the reference numeral 1 denotes a motorcycle muffler according to this embodiment. This muffler 1 is a unit swing type engine 2
The exhaust pipe 3 is connected to the exhaust port of the cylinder head 2a and extends rearward of the vehicle body, and includes a muffler body 4 connected to the rear end of the exhaust pipe 3.
【００１２】前記マフラー本体４は、図２に示すよう
に、外壁部材５の内側にパンチングメタル製の内壁部材
６を設けた二重管構造を採っており、外壁部材５と内壁
部材６との間にグラスウールからなる吸音材７を装填し
ている。この吸音材７を装填する部位を図２中にハッチ
ングを施して示す。この実施の形態では、外壁部材５
は、前端部の第１のパイプ５ａと、中央部の第２のパイ
プ５ｂと、後端部の蓋体５ｃとから構成し、内壁部材６
は、前記第１のパイプ５ａの内周部に溶接した第１の部
材６ａと、前記第２のパイプ５ｂの内周部にスペーサ８
を介して固着した第２の部材６ｂと、前記蓋体５ｃの内
面に溶接した第３の部材６ｃとから構成している。As shown in FIG. 2, the muffler body 4 has a double-pipe structure in which an inner wall member 6 made of punched metal is provided inside an outer wall member 5, and the outer wall member 5 and the inner wall member 6 are connected to each other. A sound absorbing material 7 made of glass wool is loaded in between. The portion where the sound absorbing material 7 is loaded is shown by hatching in FIG. In this embodiment, the outer wall member 5
Is composed of a first pipe 5a at the front end, a second pipe 5b at the center, and a lid 5c at the rear end.
Are a first member 6a welded to the inner periphery of the first pipe 5a, and a spacer 8 on the inner periphery of the second pipe 5b.
And a third member 6c welded to the inner surface of the lid 5c.
【００１３】また、このマフラー本体４は、前記内壁部
材６の内周側に第１および第２の隔壁９，１０を設け、
第１〜第３の膨張室１１〜１３を車体の前後方向に一列
に並ぶように形成している。第１および第２の隔壁９，
１０は、図３および図４に示すように、それぞれ円板状
に形成して外周部に円筒９ａ，１０ａを一体に形成し、
この円筒９ａ，１０ａを前記内壁部材６の内周面に嵌合
させた状態で内壁部材６に溶接している。The muffler body 4 has first and second partitions 9 and 10 on the inner peripheral side of the inner wall member 6.
The first to third expansion chambers 11 to 13 are formed so as to be arranged in a line in the front-rear direction of the vehicle body. First and second partition walls 9,
As shown in FIG. 3 and FIG. 4, each of the cylinders 10 is formed in a disk shape, and cylinders 9a and 10a are integrally formed on the outer periphery thereof.
The cylinders 9 a and 10 a are welded to the inner wall member 6 in a state of being fitted to the inner peripheral surface of the inner wall member 6.
【００１４】前記三つの膨張室１１〜１３のうち、最も
車体後側に位置する第１の膨張室１１は、前記両隔壁
９，１０を貫通してマフラー本体４の前端部から後方に
延びる排ガス流入管１４を介して前記排気管３に接続す
るとともに、前記第２の隔壁１０を貫通する第１の連通
管１５を介して中央の第２の膨張室１２に連通してい
る。Of the three expansion chambers 11 to 13, the first expansion chamber 11 located closest to the rear of the vehicle body is an exhaust gas that extends through the partition walls 9 and 10 and extends rearward from the front end of the muffler body 4. It is connected to the exhaust pipe 3 via an inflow pipe 14 and communicates with a central second expansion chamber 12 via a first communication pipe 15 penetrating through the second partition 10.
【００１５】また、第２の膨張室１２は、前記第１の隔
壁９を貫通する第２の連通管１６を介して最前端の第３
の膨張室１３に連通させている。さらに、第３の膨張室
１３は、前記両隔壁９，１０を貫通して後方に延びると
ともにマフラー本体４の後端部からマフラー本体４外に
突出する排ガス排出管１７を介して大気に開放させてい
る。The second expansion chamber 12 is connected to the third foremost end via a second communication pipe 16 penetrating the first partition wall 9.
Is communicated with the expansion chamber 13. Further, the third expansion chamber 13 is opened to the atmosphere through an exhaust gas discharge pipe 17 extending rearward through the partition walls 9 and 10 and projecting from the rear end of the muffler body 4 to the outside of the muffler body 4. ing.
【００１６】すなわち、このマフラー本体４は、排ガス
が排気管３から最後端の第１の膨張室１１に流入し、こ
の第１膨張室１１から第２の膨張室１２および第３の膨
張室１３をこの順に通ってから大気中に排出される構造
を採っている。That is, in the muffler body 4, the exhaust gas flows from the exhaust pipe 3 into the rearmost first expansion chamber 11, and from the first expansion chamber 11 to the second expansion chamber 12 and the third expansion chamber 13. Are passed through in this order and then discharged into the atmosphere.
【００１７】前記排ガス流入管１４は、複数の管体を組
合わせて溶接することによって形成し、前端部（基端
部）をマフラー本体４の前端部に溶接するとともに、マ
フラー本体４内で後方に延びる部分を前記第１および第
２の隔壁９，１０に保持させている。この排ガス流入管
１４の前端部は、マフラー本体４から車体の前方に突出
させ、突出端に前記排気管３を接続している。この排ガ
ス流入管１４がマフラー本体４を貫通する部分は、排ガ
スが第３の膨張室１３から漏洩することがないように排
ガス流入管１４を全周にわたってマフラー本体４に溶接
している。The exhaust gas inflow pipe 14 is formed by combining and welding a plurality of pipes, and a front end (base end) is welded to a front end of the muffler body 4 and a rear end in the muffler body 4. Are held by the first and second partition walls 9 and 10. The front end of the exhaust gas inflow pipe 14 projects forward of the vehicle body from the muffler main body 4, and the exhaust pipe 3 is connected to the protruding end. The exhaust gas inflow pipe 14 is welded to the muffler body 4 over the entire circumference so that the exhaust gas does not leak from the third expansion chamber 13 at a portion where the exhaust gas inflow pipe 14 penetrates the muffler body 4.
【００１８】この排ガス流入管１４の後部を前記両隔壁
９，１０で保持する構造は、両隔壁９，１０に円筒９
ｂ，１０ｂを一体に形成し、この円筒９ｂ，１０ｂ内に
排ガス流入管１４を嵌入させる構造を採っている。排ガ
ス流入管１４は、両隔壁９，１０のうち前側に位置する
第１の隔壁９の円筒９ｂに溶接し、第２の隔壁１０の円
筒１０ｂには溶接していない。The structure in which the rear portion of the exhaust gas inflow pipe 14 is held by the partition walls 9 and 10 has a structure in which the partition walls 9 and 10 are provided with a cylinder 9.
b, 10b are formed integrally, and the exhaust gas inflow pipe 14 is fitted into the cylinders 9b, 10b. The exhaust gas inflow pipe 14 is welded to the cylinder 9b of the first partition 9 located on the front side of the two partitions 9, 10, but not to the cylinder 10b of the second partition 10.
【００１９】第２の隔壁１０の円筒１０ｂは、図２に示
すように、軸線方向に延びるスリットＳを周方向に間隔
をおいて複数形成し、排ガス流入管１４を嵌挿させるこ
とによって自らの弾性で保持する構造を採っている。す
なわち、排ガス流入管１４は、マフラー本体４を貫通す
る基端部と、第１の隔壁９を貫通する部分とをマフラー
本体４に対して固定するとともにし、先端部側を第２の
隔壁１０に摺動自在に保持させている。この実施の形態
では、前記スリットＳを円筒１０ｂの３箇所に形成して
いる。As shown in FIG. 2, the cylinder 10b of the second partition 10 has a plurality of slits S extending in the axial direction at intervals in the circumferential direction, and the exhaust gas inflow pipe 14 is inserted thereinto to form its own cylinder. It has a structure to hold it with elasticity. That is, the exhaust gas inflow pipe 14 fixes the base end portion penetrating the muffler main body 4 and the portion penetrating the first partition wall 9 to the muffler main body 4 and the distal end side of the second partition wall 10. Slidably. In this embodiment, the slits S are formed at three places of the cylinder 10b.
【００２０】この排ガス流入管１４の前端部であって第
３の膨張室１３を貫通する部分は、パンチングメタル製
の筒体１４ａによって形成し、この筒体１４ａを覆うよ
うに設けた外筒１４ｂとの間にステンレスウール製の吸
音材１８を装填している。A portion of the front end of the exhaust gas inflow pipe 14 which penetrates the third expansion chamber 13 is formed by a cylinder 14a made of punched metal, and an outer cylinder 14b provided to cover the cylinder 14a. And a sound absorbing material 18 made of stainless steel wool.
【００２１】また、この排ガス流入管１４における第２
の膨張室１２を貫通する部分には、図３に示すように、
触媒コンバータ１９を介装している。この触媒コンバー
タ１９は、ステンレス鋼製の薄板を折り畳むように屈曲
させて内部に排気通路を形成し、この薄板の表裏両面に
触媒金属を担持させた構造を採っている。さらに、この
排ガス流入管１４の後端部（第１の膨張室１１内に延び
る下流側端部）は、パンチングメタル製の筒体１４ｃに
よって形成し、下流端の開口を蓋体１４ｄによって閉塞
している。The second exhaust gas inflow pipe 14
As shown in FIG. 3, a portion penetrating through the expansion chamber 12
The catalytic converter 19 is interposed. The catalytic converter 19 has a structure in which a stainless steel thin plate is bent so as to be folded to form an exhaust passage therein, and a catalyst metal is supported on both front and back surfaces of the thin plate. Further, a rear end (a downstream end extending into the first expansion chamber 11) of the exhaust gas inflow pipe 14 is formed by a cylindrical body 14c made of punched metal, and an opening at the downstream end is closed by a lid 14d. ing.
【００２２】前記第１の連通管１５は、前端部を前記第
２の隔壁１０に溶接するとともに、第１の膨張室１１内
に設けた保持部材２０に後端部を保持させている。この
第１の連通管１５と第２の隔壁１０との溶接部は、第２
の隔壁１０に一体に形成した円筒１０ｃ（図４参照）に
第１の連通管１５を嵌入させる構造を採っている。ま
た、第１の連通管１５の後端部を前記保持部材２０で保
持する構造は、前記排ガス流入管１４の後部を摺動自在
に保持する構造と同一の構造を採っている。保持部材２
０に形成する円筒を図２および図５中に符号２０ａで示
す。The first communication pipe 15 has a front end welded to the second partition 10 and a rear end held by a holding member 20 provided in the first expansion chamber 11. The welded portion between the first communication pipe 15 and the second partition 10 is
A structure in which the first communication pipe 15 is fitted into a cylinder 10c (see FIG. 4) formed integrally with the partition wall 10 is adopted. The structure for holding the rear end of the first communication pipe 15 with the holding member 20 has the same structure as the structure for slidably holding the rear part of the exhaust gas inflow pipe 14. Holding member 2
The cylinder formed at 0 is indicated by reference numeral 20a in FIGS.
【００２３】前記保持部材２０は、図５に示すように、
前記排ガス流入管１４および後述する排ガス排出管１７
を挿通させるとともに第１の膨張室１１内を仕切ること
がないように開口２０ｂを形成している。The holding member 20 is, as shown in FIG.
The exhaust gas inflow pipe 14 and an exhaust gas exhaust pipe 17 described below.
And the opening 20b is formed so as not to partition the inside of the first expansion chamber 11.
【００２４】前記第２の連通管１６は、前記第１の隔壁
９を貫通して第２の膨張室１２内から第３の膨張室１３
内に延びるように形成し、第１の隔壁９に形成した円筒
９ｃに嵌合させて溶接している。The second communication pipe 16 penetrates through the first partition wall 9 and extends from the inside of the second expansion chamber 12 to the third expansion chamber 13.
The first partition 9 is welded by being fitted into a cylinder 9c formed on the first partition 9.
【００２５】前記排ガス排出管１７は、排ガス流入管１
４と同様に複数の管体を組合わせて溶接することによっ
て形成し、後端部（基端部）をマフラー本体４の後端部
に溶接するとともに、マフラー本体４内で前後方向に延
びる部分を前記第１および第２の隔壁９，１０に保持さ
せている。The exhaust gas discharge pipe 17 is connected to the exhaust gas inflow pipe 1.
4, a plurality of pipes are formed by combining and welding, and a rear end (base end) is welded to a rear end of the muffler main body 4 and a portion extending in the front-rear direction in the muffler main body 4. Is held by the first and second partition walls 9 and 10.
【００２６】この排ガス排出管１７の後端部は、マフラ
ー本体４の後端部を貫通して車体の後方に突出させてい
る。排ガス排出管１７がマフラー本体４を貫通する部分
は、排ガスが第１の膨張室１１から漏洩することがない
ように、排ガス排出管１７を全周にわたってマフラー本
体４に溶接している。The rear end of the exhaust gas discharge pipe 17 penetrates the rear end of the muffler main body 4 and projects rearward of the vehicle body. The portion where the exhaust gas discharge pipe 17 penetrates the muffler main body 4 is welded to the muffler main body 4 over the entire circumference so that the exhaust gas does not leak from the first expansion chamber 11.
【００２７】この排ガス排出管１７の前部を前記両隔壁
９，１０で保持する構造は、両隔壁９，１０に円筒９
ｄ，１０ｄを一体に形成し、これらの円筒９ｄ，１０ｄ
内に排ガス排出管１７を嵌入させる構造を採っている。
これらの円筒９ｄ，１０ｄもスリットＳを３箇所ずつ形
成し、自らの弾性で排ガス排出管１７を保持する構造を
採っている。The structure in which the front portion of the exhaust gas discharge pipe 17 is held by the partition walls 9 and 10 has a structure in which the partition walls 9 and 10 are provided with a cylinder 9.
d, 10d are integrally formed, and these cylinders 9d, 10d
A structure is adopted in which the exhaust gas discharge pipe 17 is fitted.
These cylinders 9d and 10d also have slits S formed at three locations, and have a structure in which the exhaust gas discharge pipe 17 is held by its own elasticity.
【００２８】また、排ガス排出管１７は、第２の膨張室
１２から第１の膨張室１１にわたって延びる部分をパン
チングプレートからなる内管１７ａと外管１７ｂとによ
って二重管構造になるように形成し、内管１７ａと外管
１７ｂとの間にグラスウールからなる吸音材２１を装填
している。Further, the exhaust gas discharge pipe 17 is formed so that a portion extending from the second expansion chamber 12 to the first expansion chamber 11 has a double pipe structure by an inner pipe 17a and an outer pipe 17b formed of a punching plate. The sound absorbing material 21 made of glass wool is loaded between the inner pipe 17a and the outer pipe 17b.
【００２９】上述したように構成した自動二輪車用マフ
ラー１は、第１〜第３の膨張室１１〜１３を膨張段数の
順に一列に並べているから、膨張室１１〜１３どうしの
間の第１および第２の隔壁９，１０を排ガス流入管１４
および排ガス排出管１７が貫通する部分に形成される隙
間を通って排ガスが漏洩したとしても、この漏洩した排
ガスは次の膨張段数の膨張室に流入する。In the motorcycle muffler 1 configured as described above, since the first to third expansion chambers 11 to 13 are arranged in a line in the order of the number of expansion stages, the first and third expansion chambers 11 to 13 are arranged between the first and third expansion chambers. The second partition walls 9 and 10 are connected to the exhaust gas inflow pipe 14.
Even if the exhaust gas leaks through a gap formed in a portion where the exhaust gas discharge pipe 17 penetrates, the leaked exhaust gas flows into the expansion chamber of the next expansion stage.
【００３０】したがって、排ガス流入管１４や排ガス排
出管１７を摺動自在に保持する部分に気密性が高く高価
なシール構造を採用しなくてよい。Therefore, it is not necessary to adopt a highly airtight and expensive seal structure in a portion that slidably holds the exhaust gas inflow pipe 14 and the exhaust gas exhaust pipe 17.
【００３１】なお、この実施の形態ではユニットスイン
グ式エンジンに本発明に係るマフラーを適用する例を示
したが、このマフラーは、自動二輪車のエンジンであれ
ばどのような形態のエンジンにも使用することができ
る。In this embodiment, an example is shown in which the muffler according to the present invention is applied to a unit swing type engine. However, this muffler can be used for any type of motorcycle engine. be able to.
【００３２】[0032]
【発明の効果】以上説明したように本発明によれば、排
ガス流入管１４や排ガス排出管を摺動自在に保持する部
分に気密性が高く高価なシール構造を採用しなくてよい
から、コストダウンを図りながら、消音性能が高い多段
膨張式の自動二輪車用マフラーを提供することができ
る。As described above, according to the present invention, it is not necessary to employ a highly airtight and expensive seal structure in a portion for slidably holding the exhaust gas inflow pipe 14 and the exhaust gas exhaust pipe. It is possible to provide a multi-stage inflatable muffler for a motorcycle with high noise reduction performance while downsizing.
【図１】 本発明に係る自動二輪車用マフラーの側面図
である。FIG. 1 is a side view of a muffler for a motorcycle according to the present invention.
【図２】 マフラー本体の縦断面図である。FIG. 2 is a longitudinal sectional view of a muffler main body.
【図３】 図２におけるIII−III線断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 2;
【図４】 図２におけるIV−IV線断面図である。FIG. 4 is a sectional view taken along line IV-IV in FIG.
【図５】 図２におけるV−V線断面図である。FIG. 5 is a sectional view taken along line VV in FIG. 2;
１…マフラー、４…マフラー本体、９…第１の隔壁、１
０…第２の隔壁、１１…第１の膨張室、１２…第２の膨
張室、１３…第３の膨張室、１４…排ガス流入管、１７
…排ガス排出管。DESCRIPTION OF SYMBOLS 1 ... Muffler, 4 ... Muffler main body, 9 ... 1st partition, 1
0: second partition, 11: first expansion chamber, 12: second expansion chamber, 13: third expansion chamber, 14: exhaust gas inflow pipe, 17
... Exhaust gas exhaust pipe.
Claims (1)
動二輪車用マフラーにおいて、前記膨張室を車体の前後
方向に一列に並べ、マフラー本体の前端部から膨張室間
の隔壁を貫通して最後端の膨張室まで延びる排ガス流入
管と、最前端の膨張室から膨張室間の隔壁およびマフラ
ー本体の後端壁を貫通してマフラー外に延びる排ガス排
出管とを設けるとともに、隣接する膨張室どうしを互い
に連通させてなり、前記両管体におけるマフラー本体を
貫通する基端部をマフラー本体に溶接するとともに、マ
フラー本体内に位置する先端部側を、この先端部が位置
する膨張室の隔壁に摺動自在に保持させたことを特徴と
する自動二輪車用マフラー。In a muffler for a motorcycle having a plurality of expansion chambers provided in a muffler body, the expansion chambers are arranged in a line in the front-rear direction of the vehicle body, and extend from a front end of the muffler body through a partition wall between the expansion chambers. An exhaust gas inflow pipe extending to the end expansion chamber; an exhaust gas exhaust pipe extending from the frontmost expansion chamber to a partition wall between the expansion chambers and a rear end wall of the muffler body to extend outside the muffler; Are connected to each other, and the base ends of the two pipes that penetrate the muffler body are welded to the muffler body, and the distal end side located in the muffler main body is connected to the partition wall of the expansion chamber where the distal end is located. A muffler for a motorcycle, which is slidably held.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24598399A JP2001073740A (en) | 1999-08-31 | 1999-08-31 | Muffler for motorcylce |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24598399A JP2001073740A (en) | 1999-08-31 | 1999-08-31 | Muffler for motorcylce |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001073740A true JP2001073740A (en) | 2001-03-21 |
Family
ID=17141739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24598399A Pending JP2001073740A (en) | 1999-08-31 | 1999-08-31 | Muffler for motorcylce |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001073740A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014181639A (en) * | 2013-03-21 | 2014-09-29 | Honda Motor Co Ltd | Engine muffler |
-
1999
- 1999-08-31 JP JP24598399A patent/JP2001073740A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014181639A (en) * | 2013-03-21 | 2014-09-29 | Honda Motor Co Ltd | Engine muffler |
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