JP2003048592A - Exhaust system for motorcycle - Google Patents

Exhaust system for motorcycle

Info

Publication number
JP2003048592A
JP2003048592A JP2001240149A JP2001240149A JP2003048592A JP 2003048592 A JP2003048592 A JP 2003048592A JP 2001240149 A JP2001240149 A JP 2001240149A JP 2001240149 A JP2001240149 A JP 2001240149A JP 2003048592 A JP2003048592 A JP 2003048592A
Authority
JP
Japan
Prior art keywords
vehicle body
parallel
silencer
motorcycle
exhaust
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.)
Granted
Application number
JP2001240149A
Other languages
Japanese (ja)
Other versions
JP3907435B2 (en
Inventor
Hideki Yamaguchi
英輝 山口
Hiroshi Nakagome
浩 中込
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP2001240149A priority Critical patent/JP3907435B2/en
Priority to IT2002TO000546A priority patent/ITTO20020546A1/en
Priority to DE2002135243 priority patent/DE10235243B4/en
Priority to DE10235244A priority patent/DE10235244B4/en
Priority to DE2002135242 priority patent/DE10235242B4/en
Publication of JP2003048592A publication Critical patent/JP2003048592A/en
Application granted granted Critical
Publication of JP3907435B2 publication Critical patent/JP3907435B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/08Other arrangements or adaptations of exhaust conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/04Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of an exhaust pipe, manifold or apparatus in relation to vehicle frame or particular vehicle parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00Structure or shape of gas passages, pipes or tubes
    • F01N2470/10Tubes having non-circular cross section
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00Structure or shape of gas passages, pipes or tubes
    • F01N2470/14Plurality of outlet tubes, e.g. in parallel or with different length
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00Structure, disposition or shape of gas-chambers
    • F01N2490/16Chambers with particular shapes, e.g. spherical
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/04Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for motorcycles

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce a vehicle width even when the capacity of a muffler is increased, by arranging a parallel portion of the muffler near to the highest lift position of a rear wheel, positioning the parallel portion inwardly nearer to a vehicle body while preventing an interference between the muffler and the rear wheel, and reducing a side projection level of a rear cowl. SOLUTION: The mufflers 22 and 23 comprise the parallel portions 66 and 74 parallel to a longitudinal vehicle body center axis 65, and inclined portions 67 and 75 extended backward from the parallel portions 66 and 74 and brought gradually nearer to the longitudinal vehicle body center axis 65. The rear cowl 47 is placed substantially over the outline of the left and right mufflers 22 and 23 arranged in symmetry with respect to the longitudinal vehicle body center axis 65.

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、消音器の容量を大
きくした場合でも、車幅を抑え、車体後部をコンパクト
に構成するのに好適な自動二輪車の排気装置に関する。 【0002】 【従来の技術】車体後部で後輪の上方に左右一対の消音
器を配置した自動二輪車が知られている。このような自
動二輪車の排気装置を開示したものとしては、例えば、
特開平5−77776号公報「自動二輪車の物入れ」が
あり、この公報の図4には、エンジンから後方に延びる
排気管17,17(符号については、同公報に記載され
ているものを使用した。以下同様。)にそれぞれ車体後
部で排気消音器18を連結し、これらの排気消音器1
8,18をリヤカウル部24で覆った自動二輪車が記載
されている。 【0003】 【発明が解決しようとする課題】上記した排気消音器1
8は、前部が後部より車体側方に位置するように傾斜さ
せたものであるため、リヤカウル部24は、排気消音器
18の前部近傍で車体側方に大きく膨らみ、車幅が大き
くなる。排気騒音の低減効果を高めるために排気消音器
18の容積を増せば、車幅は更に大きくなる。 【0004】そこで、本発明の目的は、自動二輪車の排
気装置を改良することで、消音器の容量を大きくした場
合でも車幅を抑えることにある。 【0005】 【課題を解決するための手段】上記目的を達成するため
に請求項1は、エンジンから後方へ延ばした排気管を左
右一対の消音器に連結し、これらの消音器をリヤカウル
で覆った自動二輪車において、消音器は、車体長手中心
軸に平行な平行部と、この平行部から後方へ延びるとと
もに車体長手中心軸に徐々に近づく傾斜部とから構成
し、車体長手中心軸に対称に配置した左右の消音器の外
形にほぼ沿うようにリヤカウルを被せたことを特徴とす
る。 【0006】消音器の容量を大きくした場合でも、消音
器の平行部を後輪の最上昇位置に近接させるように配置
することで、消音器と後輪との干渉を防止しつつ平行部
をより車体内側へ寄せることができ、リヤカウルの側方
への突出量を小さくして車幅を抑えることができる。 【0007】 【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。なお、図面は符号の向きに見る
ものとする。図1は本発明に係る排気装置を備えた自動
二輪車の側面図であり、自動二輪車10は、ヘッドパイ
プ11から後方且つやや下方にメインフレーム12,1
2(奥側のメインフレーム12は不図示)を延ばし、こ
れらのメインフレーム12,12の下部にV型のエンジ
ン13を取付け、このエンジン13の前側のシリンダヘ
ッド14から排気管15,16を後方へ延ばし、これら
の排気管15,16を一つに集合させた後に排気管とし
ての集合部17に連結し、この集合部17から排気管1
8を立上げて後輪21の上方に配置した左右の消音器2
2,23(奥側の消音器23は不図示)に連結し、エン
ジン13の後側のシリンダヘッド25から後方へ排気管
26,27を延ばし、これらの排気管26,27を一つ
に集合させた後に前述の集合部17に連結し、メインフ
レーム12,12の後部上部から後方斜め上方へシート
レール28を延ばし、このシートレール28にメインフ
レーム12,12の後部下部から後方斜め上方へ延ばし
たサブパイプ31,31(奥側のサブパイプ31は不図
示)の中間部及び後端を取付けた車両である。 【0008】ここで、35はエンジン13の後部に一体
的に設けたミッションケース、36はミッションケース
35にスイング可能に取付けたスイングアーム、37は
スイングアーム36の前部下部及びミッションケース3
5にリンク装置38を介して下端を連結するとともに上
端をメインフレーム12,12の後部に連結したリヤク
ッションユニット、41はメインフレーム12,12の
上部に取付けた燃料タンク、42は燃料タンク41の下
部に設けた吸気ボックス、43はシートレール28上に
取付けたタンデムシート(44は運転者用シート、45
は同乗者用シート)、46,46(奥側の符号46は不
図示)は同乗者が掴まるグラブレール、47は消音器2
2,23を覆うリヤカウル、48はリヤフェンダ、49
はテールランプ、51はフロントフォーク、52は前
輪、53はフロントフェンダ、54はフロントカウル、
55はハンドルである。 【0009】図2は本発明に係る自動二輪車の平面図で
あり、エンジン13(図1参照)の前側の各気筒から排
気管15,16を後方へ延ばし、エンジン13の後側の
各気筒から排気管26,27を後方へ延ばし、排気管1
8を左右の消音器22,23に連結したことを示す。 【0010】グラブレール46,46は、消音器22,
23よりも車体側方へ突出するため、例えば、車体後部
の側方から車体に何等かの外力が作用しても、グラブレ
ール46,46によって、その外力が直接に消音器2
2,23に作用するのを防止することができる。 【0011】上記した排気管15,16、排気管26,
27、集合部17(図1参照)、排気管18及び消音器
22,23は、排気装置60を構成するものである。 【0012】図3は本発明に係る排気装置を説明する車
体後部の平面図であり、排気管18は、前側に設けた排
気管前部61と、この排気管前部61から右側の消音器
23に接続する右側接続部62と、この右側接続部62
と左側の消音器22とを連結する連結部63とからな
る。 【0013】消音器22は、自動二輪車10(図1参
照)の車体長手中心軸65に平行な平行部66と、この
平行部66から車体後方へ延ばすとともに車体長手中心
軸65に徐々に近づけた傾斜部67とからなる。なお、
71は平行部66の長手中心軸であり、車体長手中心軸
65に平行にした軸である。72は傾斜部67の長手中
心軸であり、車体長手中心軸65に対して角度θだけ傾
けた軸である。 【0014】消音器23は、車体長手中心軸65に対し
て消音器22と対称な形状にした部材であり、平行部7
4及び傾斜部75からなる。なお、76は平行部74の
長手中心軸、77は傾斜部75の長手中心軸であり、長
手中心軸76は車体長手中心軸65に平行にした軸、長
手中心軸77は車体長手中心軸65に対して角度θだけ
傾けた軸である。上記した平行部66,74は、後輪2
1の車軸80の上方に配置した部分であり、後輪21が
車体に対して上昇したときに後輪21の上部と干渉しな
いように留意する部分である。 【0015】リヤカウル47は、タンデムシート43
(図1参照)の両側部及び後部の下方に配置した部材で
あり、消音器22,23の平行部66,74の側方位置
で車幅としての最大幅Bとなり、この位置より後方では
縁部47a,47bは後方にいくにつれて傾斜部67,
75にほぼ沿って先すぼまりとなる。 【0016】図4は本発明に係る排気装置の配置を説明
する側面図であり、左右の消音器22,23(消音器2
3は不図示)を連結する連結部63(図3も参照)を、
タンデムシート43における運転者用シート44と同乗
者用シート45との間の下方に配置したことを示す。な
お、82は車体に対して最も上昇した後輪21の位置、
即ち最上昇位置である。 【0017】タンデムシート43は、下部に設けた底板
43aの運転者用シート44と同乗者用シート45との
間の位置に窪み部43bを形成し、この窪み部43bの
底と連結部63とを所定クリアランスCだけ隔てた部材
である。消音器22,23は、運転者用シート44の後
方、即ち、乗車した運転者83よりも後方に位置する。 【0018】このように、連結部63を運転者用シート
44と同乗者用シート45との間の下方に配置したこと
により、タンデムシート43と連結部63とを所定クリ
アランスCだけ離すことができるとともに、後輪21が
車体に対して上昇する際の後輪21の移動距離を確保す
ることができる。更に、運転者用シート44及び同乗者
用シート45のクッション材43cの厚さを確保するこ
とができ、運転者用シート44及び同乗者用シート45
のクッション性は損なわれない。 【0019】図5は本発明に係る排気装置を説明する背
面図であり、背面から見た後輪21の最上昇位置84に
対して、消音器22の平行部66及び排気管23の平行
部74を側方へそれぞれ距離D1及び距離D2(D2=
D1でもよい。)だけ離し、リヤカウル47の側部を消
音器22,23の側面に回り込ませるように形成したこ
とを示す。 【0020】図6(a),(b)は本発明に係る消音器
を説明する説明図であり、(a)は図4の6矢視図、
(b)は消音器22の縦断面図である。(a)におい
て、消音器22は、通常の円形とは異なる外形形状(お
むすび形)を有する部材であり、外壁22aを内壁部2
2bと、上部傾斜壁部22cと、外側傾斜壁部22dと
から構成し、上部傾斜壁部22cにシートレール28
(図1参照)に取付けるための取付け部86を設け、外
側傾斜壁部22dに遮熱板87(図1参照)を取付ける
ための遮熱板取付け部88を設けたものである。なお、
91,92はテールパイプである。 【0021】(b)において、消音器22((a)参
照)の縦断面を三角形に見立てたときに、内壁部22b
の断面を、鉛直線94に平行な第1の辺95、上部傾斜
壁部22cの断面を、第1の辺95の上端から車体の側
方へ延びる第2の辺96、外側傾斜壁部22dの断面
を、第2の辺96の先端と第1の辺95の下端とを繋ぐ
第3の辺97とすることができる。なお、消音器23
(図5参照)の構造は、上記(a),(b)で説明した
消音器22の構造と同様である。 【0022】以上の図1及び図3で説明したように、本
発明は、エンジン13から後方へ延ばした排気管15,
16,26,27、集合部17及び排気管18を左右一
対の消音器22,23に連結し、これらの消音器22,
23をリヤカウル47で覆った自動二輪車10におい
て、消音器22,23は、車体長手中心軸65に平行な
平行部66,74と、これらの平行部66,74から後
方へ延びるとともに車体長手中心軸65に徐々に近づく
傾斜部67,75とから構成し、車体長手中心軸65に
対称に配置した左右の消音器22,23の外形にほぼ沿
うようにリヤカウル47を被せたことを特徴とする。 【0023】排気騒音の低減効果を高めるために消音器
22,23の容量を大きくした場合でも、消音器22,
23の平行部66,74を後輪21の最上昇位置82に
近接するように配置したことで、消音器22,23と後
輪21との干渉を防止しつつ平行部66,74をより車
体内側へ寄せることができ、リヤカウル47が側方へ突
出する突出量を小さくしてリヤカウル47の最大幅Bを
抑えることができる。また、傾斜部67,75を設ける
ことで消音器22,23をリヤカウル47内にほぼ収め
ることができて車体後部をコンパクトに構成することが
できる。 【0024】図7は本発明に係る自動二輪車の要部側面
図であり、メインフレーム12,12の後部に設けた上
部突出部12a,12aに略S字状のシートレール28
の前端を取付け、メインフレーム12,12の後部下部
に略S字状のサブパイプ31,31のそれぞれの前端を
取付け、これらのサブパイプ31,31の中間部をシー
トレール28の中間部に取付けるとともに、サブパイプ
31,31の後端をシートレール28の後端部に更に取
付けたことを示す。 【0025】このように、シートレール28とサブパイ
プ31,31とをメインフレーム12,12に対して高
低差を付けて取付けることで、メインフレーム12,1
2とシートレール28とサブパイプ31,31とで三角
形状フレーム101を形成することができ、更に、シー
トレール28の中間部とサブパイプ31,31の中間部
とを連結し、シートレール28の後端部とサブパイプ3
1,31の後端とを連結するために、シートレール28
の前半部に加えてシートレール28の後半部の剛性を高
めることができる。 【0026】従って、このような構造で運転者及び同乗
者が乗車したタンデムシート43、容量を大きくした消
音器22,23及びその他の部品の重量を十分に支える
ことができる。 【0027】図8は図7の8矢視図であり、シートレー
ル及びサブパイプを説明する図である。シートレール2
8は、この方向から見た状態では、真直に後方へ延びる
断面矩形状の部材であり、後端部に、消音器22,23
(図5参照)、図示せぬテールランプを取付けたりリヤ
カウル47(図5参照)を介してグラブレール46,4
6(図2参照)を取付けるためのブラケット103,1
04,105を取付けたものである。 【0028】サブパイプ31は、この方向から見た状態
ではシートレール28に平行な平行パイプ部107と、
この平行パイプ部107からシートレール28側に近づ
けた傾斜パイプ部108と、シートレール28の側面に
取付けた取付パイプ部111とからなり、平行パイプ部
107の後端をシートレール28に貫通させて取付けた
クロスパイプ113に取付けた部材である。なお、11
5はシートレール28をメインフレーム12,12(図
7参照)に取付けるためのメインフレーム取付け部であ
る。 【0029】尚、本発明では、消音器を平行部と傾斜部
とから構成したが、これに限らず、車体後方ほど車体長
手中心軸に除々に近づく湾曲部(この湾曲部は車体側方
に凸にした形状又は車体側方に凹にした形状でもよ
い。)を平行部に連結した消音器でもよいし、消音器全
体をリヤカウルの縁部に沿って車体側方に凸に湾曲させ
たものでもよい。更に、消音器全体を、前部は車体側方
に凸にした形状とし、後部は車体側方に凹にした形状の
略S字状部材としてもよい。 【0030】 【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項1の自動二輪車の排気装置は、消音器を、
車体長手中心軸に平行な平行部と、この平行部から後方
へ延びるとともに車体長手中心軸に徐々に近づく傾斜部
とから構成し、車体長手中心軸に対称に配置した左右の
消音器の外形にほぼ沿うようにリヤカウルを被せたの
で、消音器の容量を大きくした場合でも、消音器の平行
部を後輪の最上昇位置に近接させるように配置すること
で、消音器と後輪との干渉を防止しつつ平行部をより車
体内側へ寄せることができ、リヤカウルの側方への突出
量を小さくして車幅を抑えることができる。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle suitable for reducing the vehicle width and making the rear part of the vehicle body compact even when the capacity of the silencer is increased. The present invention relates to an exhaust device. 2. Description of the Related Art A motorcycle is known in which a pair of left and right silencers are disposed above a rear wheel at the rear of a vehicle body. As a disclosure of such a motorcycle exhaust device, for example,
Japanese Patent Laid-Open No. 5-77776 “Motorcycle compartment” is disclosed, and in FIG. 4 of this publication, exhaust pipes 17 and 17 extending rearward from the engine (the reference numerals used in the same publication are used) The same applies hereinafter) to the exhaust muffler 18 at the rear of the vehicle body.
A motorcycle in which 8, 18 is covered with a rear cowl 24 is described. [0003] The exhaust silencer 1 described above
8 is tilted so that the front portion is located on the side of the vehicle body from the rear portion, the rear cowl portion 24 swells greatly to the side of the vehicle body in the vicinity of the front portion of the exhaust silencer 18, and the vehicle width increases. . If the volume of the exhaust silencer 18 is increased in order to enhance the effect of reducing the exhaust noise, the vehicle width is further increased. Accordingly, an object of the present invention is to suppress the vehicle width even when the capacity of the silencer is increased by improving the exhaust system of a motorcycle. In order to achieve the above object, according to a first aspect of the present invention, an exhaust pipe extending rearward from the engine is connected to a pair of left and right silencers, and these silencers are covered with a rear cowl. In the motorcycle, the silencer is composed of a parallel portion parallel to the longitudinal center axis of the vehicle body and an inclined portion that extends rearward from the parallel portion and gradually approaches the longitudinal center axis of the vehicle body, and is symmetrical to the longitudinal center axis of the vehicle body. It is characterized in that the rear cowl is covered so as to substantially follow the outer shape of the left and right silencers arranged. Even when the capacity of the silencer is increased, by arranging the parallel part of the silencer close to the highest position of the rear wheel, the parallel part is prevented while preventing interference between the silencer and the rear wheel. The vehicle can be brought closer to the inside of the vehicle body, and the lateral protrusion of the rear cowl can be reduced to reduce the vehicle width. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals. FIG. 1 is a side view of a motorcycle equipped with an exhaust device according to the present invention. The motorcycle 10 is configured such that the main frames 12, 1 are rearward and slightly downward from the head pipe 11.
2 (the main frame 12 on the back side is not shown) is extended, a V-shaped engine 13 is attached to the lower part of the main frames 12 and 12, and exhaust pipes 15 and 16 are moved backward from the cylinder head 14 on the front side of the engine 13. The exhaust pipes 15 and 16 are gathered together and connected to a gathering portion 17 as an exhaust pipe, and the exhaust pipe 1 is connected to the gathering portion 17.
Left and right silencers 2 that are placed above the rear wheel 21 by raising 8
2 and 23 (the inner silencer 23 is not shown), exhaust pipes 26 and 27 are extended rearward from the cylinder head 25 on the rear side of the engine 13, and these exhaust pipes 26 and 27 are assembled together. After that, the seat rail 28 is connected to the above-described collecting portion 17, and the seat rail 28 is extended obliquely upward and rearward from the upper rear portion of the main frames 12 and 12. The seat rail 28 is extended obliquely upward and rearward from the lower rear portion of the main frames 12 and 12. Further, the vehicle is provided with an intermediate portion and a rear end of the sub pipes 31 and 31 (the sub pipe 31 on the back side is not shown). Here, 35 is a transmission case integrally provided at the rear portion of the engine 13, 36 is a swing arm attached to the transmission case 35 so as to be swingable, 37 is a front lower portion of the swing arm 36 and the transmission case 3.
5 is a rear cushion unit in which the lower end is connected via a link device 38 and the upper end is connected to the rear part of the main frames 12, 12, 41 is a fuel tank attached to the upper part of the main frames 12, 12, and 42 is a fuel tank 41. An intake box provided at the bottom, 43 is a tandem seat mounted on the seat rail 28 (44 is a driver's seat, 45
Is a passenger's seat), 46 and 46 (reference numeral 46 on the back side is not shown) is a grab rail to be held by the passenger, 47 is a silencer 2
Rear cowl covering 2, 23, 48 rear fender, 49
Is the tail lamp, 51 is the front fork, 52 is the front wheel, 53 is the front fender, 54 is the front cowl,
Reference numeral 55 denotes a handle. FIG. 2 is a plan view of the motorcycle according to the present invention. Exhaust pipes 15 and 16 are extended rearward from the front cylinders of the engine 13 (see FIG. 1), and the rear cylinders of the engine 13 are extended. The exhaust pipes 26 and 27 are extended rearward, and the exhaust pipe 1
8 is connected to the left and right silencers 22,23. The grab rails 46, 46 are connected to the silencer 22,
For example, even if any external force acts on the vehicle body from the side of the rear part of the vehicle body, the external force is directly applied by the grab rails 46 and 46 to the silencer 2.
2 and 23 can be prevented. The exhaust pipes 15, 16, the exhaust pipe 26,
27, the collecting portion 17 (see FIG. 1), the exhaust pipe 18, and the silencers 22 and 23 constitute an exhaust device 60. FIG. 3 is a plan view of the rear part of the vehicle body for explaining the exhaust system according to the present invention. The exhaust pipe 18 includes an exhaust pipe front part 61 provided on the front side, and a muffler on the right side from the exhaust pipe front part 61. 23 and a right connection 62 connected to the right connection 23.
And a connecting portion 63 that connects the left silencer 22 to the left. The silencer 22 is parallel to the longitudinal center axis 65 of the motorcycle 10 (see FIG. 1), extends from the parallel portion 66 to the rear of the body, and gradually approaches the longitudinal center axis 65 of the vehicle. An inclined portion 67 is included. In addition,
Reference numeral 71 denotes a longitudinal central axis of the parallel portion 66, which is an axis parallel to the vehicle body longitudinal central axis 65. Reference numeral 72 denotes a longitudinal central axis of the inclined portion 67, which is an axis inclined by an angle θ with respect to the vehicle body longitudinal central axis 65. The silencer 23 is a member symmetrical to the silencer 22 with respect to the longitudinal center axis 65 of the vehicle body.
4 and an inclined portion 75. In addition, 76 is the longitudinal center axis of the parallel portion 74, 77 is the longitudinal center axis of the inclined portion 75, the longitudinal center axis 76 is an axis parallel to the vehicle body longitudinal center axis 65, and the longitudinal center axis 77 is the vehicle body longitudinal center axis 65. The axis is inclined by an angle θ with respect to the axis. The parallel parts 66 and 74 described above are arranged on the rear wheel 2.
1 is a portion disposed above the axle 80, and is a portion to be careful not to interfere with the upper portion of the rear wheel 21 when the rear wheel 21 rises with respect to the vehicle body. The rear cowl 47 has a tandem seat 43.
(Refer to FIG. 1) The members are arranged below both sides and the rear part of the silencer 22, 23, and have a maximum width B as a vehicle width at the side position of the parallel parts 66, 74. The portions 47a and 47b are inclined portions 67,
It becomes a taper substantially along 75. FIG. 4 is a side view for explaining the arrangement of the exhaust system according to the present invention. The left and right silencers 22 and 23 (the silencer 2)
3 is a connecting portion 63 (see also FIG. 3) for connecting)
This shows that the tandem seat 43 is disposed below the driver seat 44 and the passenger seat 45. Note that 82 is the position of the rear wheel 21 that is most elevated with respect to the vehicle body,
That is, it is the highest position. The tandem seat 43 is formed with a recess 43b at a position between a driver seat 44 and a passenger seat 45 on a bottom plate 43a provided at the bottom, and the bottom of the recess 43b and a connecting portion 63 are formed. Is a member separated by a predetermined clearance C. The silencers 22 and 23 are located behind the driver seat 44, that is, behind the driver 83 who gets on the driver's seat 44. Thus, by arranging the connecting portion 63 below the driver's seat 44 and the passenger's seat 45, the tandem seat 43 and the connecting portion 63 can be separated by a predetermined clearance C. At the same time, the distance traveled by the rear wheel 21 when the rear wheel 21 rises relative to the vehicle body can be secured. Furthermore, the thickness of the cushion material 43c of the driver seat 44 and the passenger seat 45 can be secured, and the driver seat 44 and the passenger seat 45 can be secured.
The cushioning is not impaired. FIG. 5 is a rear view for explaining the exhaust system according to the present invention. The parallel part 66 of the silencer 22 and the parallel part of the exhaust pipe 23 with respect to the highest rising position 84 of the rear wheel 21 as viewed from the rear side. 74 to the side, distance D1 and distance D2 (D2 =
D1 may be used. It is shown that the side portion of the rear cowl 47 is formed so as to go around the side surfaces of the silencers 22 and 23. FIGS. 6A and 6B are explanatory views for explaining a silencer according to the present invention. FIG. 6A is a view taken along arrow 6 in FIG.
(B) is a longitudinal sectional view of the silencer 22. In (a), the silencer 22 is a member having an outer shape (a rice ball shape) different from a normal circular shape, and the outer wall 22 a is connected to the inner wall portion 2.
2b, the upper inclined wall portion 22c, and the outer inclined wall portion 22d, and the seat rail 28 is provided on the upper inclined wall portion 22c.
A mounting portion 86 for mounting to (see FIG. 1) is provided, and a heat shielding plate mounting portion 88 for mounting the heat shield plate 87 (see FIG. 1) to the outer inclined wall portion 22d is provided. In addition,
91 and 92 are tail pipes. In (b), when the longitudinal section of the silencer 22 (see (a)) is regarded as a triangle, the inner wall portion 22b.
The cross section of the first side 95 parallel to the vertical line 94 and the cross section of the upper inclined wall portion 22c are the second side 96 extending from the upper end of the first side 95 to the side of the vehicle body, and the outer inclined wall portion 22d. This cross section can be a third side 97 connecting the tip of the second side 96 and the lower end of the first side 95. The silencer 23
The structure of (refer FIG. 5) is the same as that of the silencer 22 demonstrated by said (a), (b). As described above with reference to FIGS. 1 and 3, the present invention provides an exhaust pipe 15 extending rearward from the engine 13.
16, 26, 27, the collecting portion 17 and the exhaust pipe 18 are connected to a pair of left and right silencers 22, 23, and these silencers 22,
In the motorcycle 10 in which 23 is covered with a rear cowl 47, the silencers 22 and 23 are parallel portions 66 and 74 parallel to the vehicle body longitudinal central axis 65, and extend rearward from these parallel portions 66 and 74 and are longitudinally centered on the vehicle body. The rear cowl 47 is covered so as to substantially conform to the outer shapes of the left and right silencers 22 and 23 which are composed of inclined portions 67 and 75 which gradually approach 65 and are arranged symmetrically with respect to the longitudinal center axis 65 of the vehicle body. Even when the capacity of the silencers 22 and 23 is increased in order to increase the exhaust noise reduction effect,
23 are arranged so as to be close to the highest position 82 of the rear wheel 21, so that the silencer 22, 23 and the rear wheel 21 are prevented from interfering with each other so that the parallel parts 66, 74 are more The maximum amount B of the rear cowl 47 can be suppressed by reducing the amount of protrusion of the rear cowl 47 to the side. Further, by providing the inclined portions 67 and 75, the silencers 22 and 23 can be almost accommodated in the rear cowl 47, and the rear portion of the vehicle body can be configured compactly. FIG. 7 is a side view of the main part of the motorcycle according to the present invention. The upper projecting parts 12a and 12a provided at the rear parts of the main frames 12 and 12 are provided with substantially S-shaped seat rails 28.
The front ends of the sub-pipes 31 and 31 are attached to the rear lower portions of the main frames 12 and 12, and the intermediate portions of the sub-pipes 31 and 31 are attached to the intermediate portion of the seat rail 28. It shows that the rear ends of the sub pipes 31 and 31 are further attached to the rear end of the seat rail 28. In this way, the seat rail 28 and the sub pipes 31 and 31 are attached to the main frames 12 and 12 with a difference in height, so that the main frames 12 and 1 are mounted.
2, the seat rail 28, and the sub-pipes 31, 31 can form a triangular frame 101. Further, the intermediate portion of the seat rail 28 and the intermediate portion of the sub-pipes 31, 31 are connected, and the rear end of the seat rail 28 is connected. Department and subpipe 3
1 and 31 to connect the rear ends of the seat rails 28
In addition to the front half, the rigidity of the rear half of the seat rail 28 can be increased. Accordingly, it is possible to sufficiently support the weight of the tandem seat 43 on which the driver and the passenger get on, the silencers 22 and 23 with the increased capacity, and other parts, with such a structure. FIG. 8 is a view taken in the direction of arrow 8 in FIG. 7, and is a view for explaining the seat rail and the subpipe. Seat rail 2
When viewed from this direction, 8 is a member having a rectangular cross section extending straight rearward, and the mufflers 22 and 23 are disposed at the rear ends.
(See FIG. 5) Grab rails 46, 4 are attached via tail lamps (not shown) or through rear cowls 47 (see FIG. 5).
Brackets 103 and 1 for mounting 6 (see FIG. 2)
04 and 105 are attached. The sub-pipe 31 has a parallel pipe portion 107 parallel to the seat rail 28 when viewed from this direction,
The parallel pipe portion 107 is composed of an inclined pipe portion 108 that is close to the seat rail 28 side, and an attachment pipe portion 111 that is attached to the side surface of the seat rail 28. The rear end of the parallel pipe portion 107 is passed through the seat rail 28. This is a member attached to the attached cross pipe 113. 11
Reference numeral 5 denotes a main frame attachment portion for attaching the seat rail 28 to the main frames 12, 12 (see FIG. 7). In the present invention, the silencer is composed of a parallel portion and an inclined portion. However, the present invention is not limited to this, and a curved portion that gradually approaches the longitudinal axis of the vehicle body toward the rear of the vehicle body. A muffler with a convex shape or a concave shape on the side of the vehicle body may be used. The silencer may be connected to the parallel part, or the entire muffler may be curved to the side of the vehicle body along the edge of the rear cowl. But you can. Further, the entire silencer may be a substantially S-shaped member having a shape in which the front portion is convex to the side of the vehicle body and the rear portion is concave to the side of the vehicle body. The present invention exhibits the following effects by the above-described structure. The exhaust device for a motorcycle according to claim 1 comprises a silencer,
It consists of a parallel part parallel to the longitudinal axis of the vehicle body and an inclined part that extends rearward from this parallel part and gradually approaches the longitudinal axis of the vehicle body. Since the rear cowl is covered so that it almost follows, even if the capacity of the silencer is increased, the silencer and the rear wheel interfere with each other by placing the parallel part of the silencer close to the highest position of the rear wheel. The parallel portion can be moved closer to the inside of the vehicle body while preventing the vehicle width, and the lateral protrusion of the rear cowl can be reduced to reduce the vehicle width.

【図面の簡単な説明】 【図1】本発明に係る排気装置を備えた自動二輪車の側
面図 【図2】本発明に係る自動二輪車の平面図 【図3】本発明に係る排気装置を説明する車体後部の平
面図 【図4】本発明に係る排気装置の配置を説明する側面図 【図5】本発明に係る排気装置を説明する背面図 【図6】本発明に係る消音器を説明する説明図 【図7】本発明に係る自動二輪車の要部側面図 【図8】図7の8矢視図 【符号の説明】 10…自動二輪車、13…エンジン、15,16,1
7,18,26,27…排気管、22,23…消音器、
47…リヤカウル、60…排気装置、65…車体長手中
心軸、66,74…平行部、67,75…傾斜部。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a motorcycle equipped with an exhaust device according to the present invention. FIG. 2 is a plan view of a motorcycle according to the present invention. FIG. 4 is a side view illustrating the arrangement of the exhaust device according to the present invention. FIG. 5 is a rear view illustrating the exhaust device according to the present invention. FIG. 6 illustrates the silencer according to the present invention. FIG. 7 is a side view of the main part of the motorcycle according to the present invention. FIG. 8 is a view taken in the direction of the arrow 8 in FIG. 7. Explanation of reference numerals. 10 ... Motorcycle, 13 ... Engine, 15, 16, 1
7, 18, 26, 27 ... exhaust pipe, 22, 23 ... silencer,
47: Rear cowl, 60: Exhaust device, 65: Longitudinal central axis of vehicle body, 66, 74: Parallel portion, 67, 75 ... Inclined portion.

Claims (1)

【特許請求の範囲】 【請求項1】 エンジンから後方へ延ばした排気管を左
右一対の消音器に連結し、これらの消音器をリヤカウル
で覆った自動二輪車において、 前記消音器は、車体長手中心軸に平行な平行部と、この
平行部から後方へ延びるとともに車体長手中心軸に徐々
に近づく傾斜部とから構成し、車体長手中心軸に対称に
配置した左右の消音器の外形にほぼ沿うように前記リヤ
カウルを被せたことを特徴とする自動二輪車の排気装
置。
1. A motorcycle in which exhaust pipes extending rearward from an engine are connected to a pair of left and right silencers, and these silencers are covered with a rear cowl. It consists of a parallel part parallel to the axis, and an inclined part that extends rearward from this parallel part and gradually approaches the longitudinal axis of the vehicle body so that it substantially conforms to the outer shape of the left and right silencers arranged symmetrically about the longitudinal axis of the vehicle body An exhaust device for a motorcycle, wherein the rear cowl is covered with a motorcycle.
JP2001240149A 2001-08-08 2001-08-08 Motorcycle exhaust system Expired - Fee Related JP3907435B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2001240149A JP3907435B2 (en) 2001-08-08 2001-08-08 Motorcycle exhaust system
IT2002TO000546A ITTO20020546A1 (en) 2001-08-08 2002-06-21 MOTORCYCLE EXHAUST SYSTEM
DE2002135243 DE10235243B4 (en) 2001-08-08 2002-08-01 Exhaust system for a motorcycle
DE10235244A DE10235244B4 (en) 2001-08-08 2002-08-01 Exhaust system for a motorcycle
DE2002135242 DE10235242B4 (en) 2001-08-08 2002-08-01 Exhaust system for a motorcycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001240149A JP3907435B2 (en) 2001-08-08 2001-08-08 Motorcycle exhaust system

Publications (2)

Publication Number Publication Date
JP2003048592A true JP2003048592A (en) 2003-02-18
JP3907435B2 JP3907435B2 (en) 2007-04-18

Family

ID=19070804

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001240149A Expired - Fee Related JP3907435B2 (en) 2001-08-08 2001-08-08 Motorcycle exhaust system

Country Status (3)

Country Link
JP (1) JP3907435B2 (en)
DE (1) DE10235244B4 (en)
IT (1) ITTO20020546A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006046302A (en) * 2004-08-09 2006-02-16 Kawasaki Heavy Ind Ltd Exhaust device for motorcycle
JP2009051322A (en) * 2007-08-24 2009-03-12 Yamaha Motor Co Ltd Motorcycle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3008027B2 (en) * 1989-09-11 2000-02-14 ヤマハ発動機株式会社 Motorcycle seat cowl
EP0448728B1 (en) * 1989-10-18 1994-07-27 Honda Giken Kogyo Kabushiki Kaisha Exhaust apparatus in saddle type vehicle
JPH02216384A (en) * 1989-12-28 1990-08-29 Honda Motor Co Ltd Motorcycle
JPH0577776A (en) * 1991-09-18 1993-03-30 Honda Motor Co Ltd Compartment of motorcycle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006046302A (en) * 2004-08-09 2006-02-16 Kawasaki Heavy Ind Ltd Exhaust device for motorcycle
JP4532198B2 (en) * 2004-08-09 2010-08-25 川崎重工業株式会社 Motorcycle exhaust system
JP2009051322A (en) * 2007-08-24 2009-03-12 Yamaha Motor Co Ltd Motorcycle

Also Published As

Publication number Publication date
DE10235244B4 (en) 2012-10-04
JP3907435B2 (en) 2007-04-18
DE10235244A1 (en) 2003-02-27
ITTO20020546A0 (en) 2002-06-21
ITTO20020546A1 (en) 2003-12-22

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