JP3923171B2 - Exhaust device for saddle riding type vehicle - Google Patents

Exhaust device for saddle riding type vehicle Download PDF

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Publication number
JP3923171B2
JP3923171B2 JP08671798A JP8671798A JP3923171B2 JP 3923171 B2 JP3923171 B2 JP 3923171B2 JP 08671798 A JP08671798 A JP 08671798A JP 8671798 A JP8671798 A JP 8671798A JP 3923171 B2 JP3923171 B2 JP 3923171B2
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Prior art keywords
expansion chamber
exhaust
silencer
exhaust pipe
downstream
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Expired - Fee Related
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JP08671798A
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JPH11280467A (en
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英輝 山口
修 文谷
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP08671798A priority Critical patent/JP3923171B2/en
Priority to DE19912466A priority patent/DE19912466C2/en
Priority to ES009900648A priority patent/ES2156811B1/en
Priority to CN99104526A priority patent/CN1107790C/en
Publication of JPH11280467A publication Critical patent/JPH11280467A/en
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Publication of JP3923171B2 publication Critical patent/JP3923171B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/10—Tubes having non-circular cross section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/04—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for motorcycles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、鞍乗型車両、主として鞍乗型自動二輪車の排気装置に関するものである。
【０００２】
【従来の技術】
一般に鞍乗型自動二輪車の排気系は、エンジンの排気ポートに連なる排気管の下流端に消音器を接続して構成され、これが車体フレームの前後方向に沿うように配設されるが、かかる排気系において、排気騒音の低減効果を高める目的で消音器の容量を大きくする傾向があり、一方エンジン特性の要求から、排気管の管長を長くする必要を生じることがある。かかる場合に排気系の全長には自ずから制約があるため、従来では、消音器の容量を確保しつつ排気管の全長を長くするには、
(1) この排気管を消音器の前方で前後にとぐろ状等に迂回させる。
【０００３】
(2) 排気管と消音器との間に、排気集合管を収容する膨張室を直列に設ける（特公平６−５００５２号公報参照）。
【０００４】
という技術手段が採用されるのが一般的であった。
【０００５】
【発明が解決しようとする課題】
ところで前記(1) の技術手段を採用すれば、排気抵抗の増加を余儀なくされ、エンジン効率の低下を招く原因になるばかりでなく二輪車全体の体裁が損なわれるという問題があり、また前記(2) の技術手段を採用すれば、排気管の長さが消音器により制約をうける上に、消音器の外形が大きくても実質的な消音容量を十分に確保することができないという問題がある。
【０００６】
本発明はかかる実情に鑑みてなされたもので、消音器としての必要な容量を確保しながら排気管の全長を可及的に長くして、前記問題を解消できるようにした、新規な鞍乗型車両の排気装置を提供することを主な目的とするものである。
【０００７】
【課題を解決するための手段】
本請求項１記載の発明によれば、車体フレームに搭載されるエンジンの排気ポートに接続され排気管の下流端に消音器を接続し、その消音器が車体フレームの一側方において、該車体フレームの前後方向に沿設されてなる、鞍乗型車両の排気装置において、前記排気管の下流端を、消音ケースの前後方向中間部に設けた挿入口を通して該消音ケース内に挿入して、該挿入口よりも後側に延ばし、前記消音ケースは、金属板材よりなる内、外板半体の結合により形成され前記挿入口を有する前半部分と、この前半部分の後端に接続され円筒体より形成される後半部分とよりなり、前記後半部分には、前記排気管の下流端が直接開口して該排気管からの排気が直接流入する上流側膨張室が形成されると共に、前記前半部分には、前記上流側膨張室からの排気が流入する下流側膨張室が形成され、その下流側膨張室の、前記挿入口よりも前側部分は、前記消音ケースの外側に位置する前記排気管の、前記挿入口よりも上流側部分と並んで、前後方向に延びていることを特徴としており、かかる特徴によれば、排気管の全長をエンジン性能を考慮して所定の長さに設定しながら消音器の必要な容量を確保することができ、エンジン性能および消音器性能の向上を図ることができ、その上排気装置が車両全体の美観、外観上の体裁を損なうことがない。その上、排気管からの排気が直接流入する上流側膨張室を円筒体にして十分の剛性を確保して消音効果を一層高めつつ、下流側膨張室を内、外板半体の結合により形成することにより、消音器の加工が容易になる上に消音器全体のデザインがし易くなる。
【０００８】
また本請求項２記載の発明によれば、前記請求項１記載のものにおいて、前記消音ケース内は、左右方向に偏平な前記前半部分内を前後に仕切ることで前記下流側膨脹室を分割する第１隔壁と、前記前半部分と円筒状の前記後半部分との境界部分を前後に仕切る第２隔壁とが設けられていて、該第２隔壁の後側に前記上流側膨張室となる第１膨脹室が、また該第１隔壁の前側に、該第１膨脹室からの排気が導かれる第２膨脹室が、さらに該第１隔壁の後側で且つ該第２隔壁の前側に、該第２膨脹室からの排気が導かれる第３膨脹室がそれぞれ画成され、その第３膨脹室から大気放出管を介して排気が大気に放出されるようにしたことを特徴としており、かかる特徴によれば、前記請求項１の発明と同等の効果を達成する上に、下流側膨張室の加工性の向上から第２、３膨張室の設計が容易となり、消音効果を一層高めることができ、かつ所望のデザインに設定するのが容易である。
【０００９】
さらに本請求項３の発明によれば、前記請求項１のものにおいて、前記挿入口は、車体フレーム上のシートの着座位置の下方にあり、また前記消音ケースの前半部分は車体フレームに対して左右幅が上下幅よりも幅狭な偏平形状に形成されており、前記着座位置に着座する乗員の脚部が、消音器の前半部分の外側方に位置するようにしたことを特徴としており、かかる特徴によれば、前記請求項１の発明と同等の効果を達成する上に、シート上に着座する乗員の脚部周囲の、車両の横幅を狭くすることができ、乗員の足つき性を向上させることができる。
【００１０】
【発明の実施の形態】
以下、本発明の実施形態を、添付図面に示した本発明の実施例に基づいて説明する。
【００１１】
この実施例は本発明を鞍乗型自動二輪車に実施した実施例であって、以下の説明において、前後、左右および上下は、その自動二輪車の進行方向に対していう。
【００１２】
図１は、本発明排気装置を備えた自動二輪車の側面図、図２は、図１の２線矢視平面図、図３は、排気装置の一部破断平面図、図４は、図３の４−４線に沿う断面図、図５は、図４の５−５線に沿う拡大断面図、図６は、図４の６−６線に沿う拡大断面図、図７は、図４の７−７線に沿う拡大断面図、図８は、図４の８−８線に沿う拡大断面図、図９は、図４の９−９線に沿う拡大断面図、図１０は、図４の１０−１０線に沿う拡大断面図である。
【００１３】
図１、２において、鞍乗型自動二輪車の車体フレームＦの前部には、走行用エンジンＥが懸架され、また車体フレームの上面前後には燃料タンクＴとシートＳが縦列して搭載されている。燃料タンクＴの直下において、前記エンジンＥの頭部前面には排気ポートＰが開口され、この排気ポートＰには、排気系Ｅｘが接続される。
【００１４】
なお、エンジンＥが多気筒の場合には、排気ポートに排気マニホールドを介して排気系が連通接続される。
【００１５】
前記排気系Ｅｘの主体部分に構成する排気管Ｐｅは、上流側排気管１と下流側排気管２とより構成されており、前記上流側排気管１の上流端に一体に設けた接続フランジ１1 が、前記エンジンＥの排気ポートＰに接続される。上流側排気管１はエンジンＥの前方より、そのエンジンＥの一側（右側）を通って車体フレームＦの後方へと延長されており、その後端部は、自動二輪車の後車輪の上方に臨んでおり、この上流側排気管１の後端には、下流側排気管２の前端が一体に連通接続されており、この下流側排気管２は、車体フレームＦの後方へと延長されており、前記シートＳの直下で、後に詳述する消音器Ｍの中間部に挿入され、その下流端がその消音器Ｍの上流側膨張室すなわち第１膨張室Ｃ1 内に開口されている。
【００１６】
次に前記消音器Ｍの構造を図１，２に図３〜１０を併せ参照して説明する。
【００１７】
消音器Ｍは、前記シートＳの直下を前後方向に延びていて、その中間部がハンガーＨを介して車体フレームＦに懸吊支持されており、その前端は燃料タンクＴの下まで及んでいる。消音器Ｍの消音ケース３は、前後方向に長い中空の筒状に形成されており、左右方向の横幅を減らすべく、大部分が車体フレームＦの左右方向に偏平に形成される前半部分３Ｆの後端に、高剛性を確保すべく円筒体により形成される後半部分３Ｒの前端を一体に嵌合結合して構成されており、この結合部の上面に、車体フレームＦへの懸吊用の前記ハンガーＨが一体に突出形成されている。
【００１８】
前記前半部分３Ｆは、金属板材の金型加工により形成される内側板半体４と外側板半体５とを溶接等の結合手段により嵌合結合してなるもので、すなわち図３，４および図７，８に示すように車体フレームＦ側に近接する、断面偏平状の内側板半体４と、そこから遠ざかる側の、断面円弧状の外側板半体５の内端縁同志を相互に嵌合して一体に接合し、横断面モナカ状に構成され、図３に示すように、左右方向の偏平割合が前端から後端にいくにつれて漸次減少する形状となっており、上面より見た形状が前部より後部にいくにつれて漸次幅拡になっている。また前記後半部分３Ｒは、その全長にわたり等径の円筒体により形成されていて、円筒状の金属板よりなるアウタ６の内面にグラスウール８を挟んでパンチメタルよりなる同じく金属板よりなるインナ７を積層してなる二重管よりなる胴部９の開口後端に、テールプレート１０を一体に結合して構成されている。
【００１９】
前記消音ケース３内は、左右方向に偏平な前半部分３Ｆ内を前後に仕切る第１隔壁１２と、その前半部分３Ｆと円筒状の後半部分３Ｒとの境界部分を前後に仕切る第２隔壁１３と、その後半部分３Ｒ内の後部を前後に仕切る第３隔壁１４とにより、その前端から後端に向かって第２，第３および第１膨張室Ｃ2 ，Ｃ3 およびＣ1 に仕切られている。前記第１膨張室Ｃ1 は、排気管Ｐｅからの排気が直接流入する上流側膨張室を構成していて、消音器Ｍの後部にあり、図４〜６に示すように前記円筒状の後半部分３Ｒ内において、前記胴部９と、前記第２、第３隔壁１３，１４とにより画成されている。図５に示すように、第１膨張室Ｃ1 内において前記第１隔壁１２の近くには、第１膨張室Ｃ1 内を横切る多孔板１５が固着されており、第１膨張室Ｃ1 内を流れる排気はこの多孔板１５を通過して拡散されるようになっている。また第１膨張室Ｃ1 には、後に述べるように、下流側排気管２の下流端が連通される。第３隔壁１４と前記テールプレート１０との間には、その第３隔壁１４に接合される補強プレート１９が介在されている。
【００２０】
また前記第２、３膨張室は、上流側膨張室としての前記第１膨張室Ｃ1 からの排気が順に流入する下流側膨張室を構成しており、前記第２膨張室Ｃ2 は消音ケース３の前部にあり、その前半部分３Ｆを形成する内、外側板半体４，５と、前記第１隔壁１２とにより画成されており、図８に示すようにその横断面は、左右方向に偏平状に形成されていて、その第２膨張室Ｃ2 の左右内面には、グラスウール１６を挟んでパンチングプレートよりなる内板１７が一体に接合されている。さらに前記第３膨張室Ｃ3 は、消音ケース３の前後方向中間部にあり、その前半部分３Ｆを形成する内、外側板半体４，５と、前記第１，２隔壁１２，１３とにより画成されており、図７に示すように、その横断面は前記第２膨張室Ｃ2 よりも左右方向に幅の広い偏平状に形成されている。
【００２１】
消音ケース３の後部の第１膨張室Ｃ1 と、その前部の第２膨張室Ｃ2 とは、前記第１、第２隔壁１２，１３および前記多孔板１５に貫通支持される、直状の第１連通管２１により相互に連通され、また前記第２膨張室Ｃ2 と、この後部の第３膨張室Ｃ3 とは、第１隔壁１２に支持される第２連通管２２により相互に連通され、さらに第３膨張室Ｃ3 は第２隔壁１３、補強プレート１９およびテールプレート１０により支持される大気放出管２４により大気に連通されている。図９に示すように前記大気放出管２４の後部には、内面にグラスウール２５を積層した吸音筒２６が纏着されており、大気放出管２４のグラスウール２５に対面する部分には、多数の小孔２４1 が穿設されており、大気放出管２４を流れる排気の騒音はその吸音筒２６内を流れて減音されるようになっている。
【００２２】
図４に明瞭に示すように、消音器ケース３の前部の下面には、第２膨張室Ｃ2 に連通する挿入口２８が下向きに開口されており、この挿入口２８を通して前記排気管Ｐｅの下流側排気管２が消音器Ｍ内に挿入されており、この下流側排気管２の中間部はこの挿入口２８に支持されている。下流側排気管２の大部分、即ち挿入口２８よりも下流側部分は消音器Ｍ内に挿入されていて、その消音器Ｍ内を長手方向に沿って後方に延びており、前記第１、２隔壁１２，１３に貫通支持されている。そしてその下流端は、消音器Ｍ後部の第１膨張室Ｃ1 内に開口されている。第３膨張室Ｃ3 内において、下流側排気管２の外周の一部には、内面にグラスウール２９を纏着した吸音筒３０が巻装されており、このグラスウール２９に対面する下流側排気管２には多数の小孔３１が穿設されており、下流側排気管２を流れる排気の排気騒音は、この吸音筒３０で吸収減音できるようになっている。また第２膨張室Ｃ 2 の、挿入口２８よりも前側部分は、消音ケース３の外側に位置する下流側排気管２及び上流側排気管１の、挿入口２８よりも上流側部分と並んで、前後方向に延びている。
【００２３】
また図４，１０に示すように、下流側排気管２の、上流側排気管１との接続部近傍には、車体フレームＦへの取付用ブラケット３３が一体に設けられ、このブラケット３３は車体フレームＦの後部に取り付けられる。
【００２４】
図１，２に示すように、消音器Ｍの外側面は、横断面円弧状のプロテクタ３５により覆われており、このプロテクタ３５の前後部は、取付ボルト等の取付具３６，３７により車体フレームＦに固着されている。
【００２５】
次にこの実施例の作用について説明する。
【００２６】
いまエンジンＥが運転され、そこから排出される排気は、排気管Ｐｅの上流側排気管１および下流側排気管２を通り、消音器Ｍの後部の第１膨張室Ｃ1 内に流入する。消音器Ｍ内に入った排気は、第１膨張室Ｃ1 より、第１連通管２１を通過して第２膨張室Ｃ2 に流入し、さらにそこから第２連通管２２を通過して第３膨張室Ｃ3 へと流入して、その間排気は膨張と収縮を繰り返して効果的に減音される。そして第３膨張室Ｃ3 に入った、減音された排気は大気放出管２４を通って大気に放出される。
【００２７】
ところで下流側排気管２は、消音器Ｍの前後方向の中間部より、その消音器Ｍ内に挿入されてその内部を前後方向に延びているので、排気管Ｐｅの全長を可及的に長くすることができ、しかも消音器の全長も短縮されずに十分な容量を確保することができるので、排気管はエンジンの性能上要求される長さに形成することが可能になり、しかも排気管を長くすることにより消音器の消音容量を減ずることがない。
【００２８】
また消音器Ｍは、その後半部分３Ｒを、十分な剛性の確保が可能な円筒体により形成し、しかも排気管Ｐｅからの、排気騒音の高い排気は、この後半部分３Ｒに直接流入され、ここで排気騒音を効果的に減音することができ、また金属板材よりなる、内、外側板半体４，５を結合してなる前半部分３Ｆは、剛性の高い円筒体よりなる後半部分３Ｒにより効率よく一次的に減音された排気を二次的に減音することができ、またこの前半部分３Ｆは、内、外板半体４，５の結合により形成することにより、前記前半部分３Ｆ程の剛性はないものの、その加工性を向上させることができ、さらに消音器全体のデザインがし易くなる。
【００２９】
また前記排気管Ｐｅの下流端と、消音器Ｍとの連結部、即ち前記挿入口２８は、車体フレームＦ上のシートＳの着座位置の下方にあり、また消音ケース３の前半部分３Ｆは車体フレームＦに対して左右幅が上下幅よりも幅狭な偏平形状に形成され、シートＳの着座位置に着座する乗員の脚部は、消音器Ｍの前半部分３Ｆの外側方に位置することになり、乗員の脚部周囲の車両の横幅を狭くすることが可能になり、乗員の足つき性を向上させることができる。
【００３０】
以上、本発明の実施例について説明したが、本発明はその実施例に限定されることなく、本発明の範囲内で種々の実施例が可能である。たとえば前記実施例では、本発明装置を鞍乗型自動二輪車の排気系に実施した場合を説明したが、これを他の鞍乗型車両たとえば鞍乗型自動三輪車の排気系に実施することができることは勿論であり、また前記実施例では、消音器の前半部分には、上流側膨張室としての第１膨張室が、またその後半部分には、下流側膨張室としての第２、３膨張室が形成されるが、前記後半部分に２室以上の上流側膨張室を、また前記前半部分に１室もしくは３室以上の下流側膨張室を形成するようにしてもよい。
【００３１】
【発明の効果】
本請求項１記載の発明によれば、排気管の下流端を、消音ケースの前後方向中間部に設けた挿入口を通して消音ケース内に挿入して、挿入口よりも後側に延ばし、消音ケースは、金属板材よりなる内、外板半体の結合により形成され挿入口を有する前半部分と、この前半部分の後端に接続され円筒体より形成される後半部分とよりなり、その後半部分には、排気管の下流端が直接開口して排気管からの排気が直接流入する上流側膨張室が形成されると共に、前記前半部分には、上流側膨張室からの排気が流入する下流側膨張室が形成され、その下流側膨張室の、挿入口よりも前側部分は、消音ケースの外側に位置する排気管の、挿入口よりも上流側部分と並んで、前後方向に延びているので、排気管の全長をエンジン性能を考慮して所定の長さに設定しながら消音器の必要な容量を確保することができ、エンジン性能および消音器性能の向上を図ることができ、その上、排気装置が車両全体の美観、外観上の体裁を損なうことがない。しかも排気管からの排気が直接流入する上流側膨張室を円筒体にして十分の剛性を確保して消音効果を一層高めつつ、下流側膨張室を内、外板半体の結合により形成することにより、消音器の加工が容易になり、さらに消音器全体のデザインがし易くなる。
【００３２】
また特に請求項２の発明によれば、消音ケース内は、左右方向に偏平な前半部分内を前後に仕切ることで下流側膨脹室を分割する第１隔壁と、前半部分と円筒状の後半部分との境界部分を前後に仕切る第２隔壁とが設けられていて、該第２隔壁の後側に上流側膨張室となる第１膨脹室が、また該第１隔壁の前側に、該第１膨脹室からの排気が導かれる第２膨脹室が、さらに該第１隔壁の後側で且つ該第２隔壁の前側に、該第２膨脹室からの排気が導かれる第３膨脹室がそれぞれ画成され、その第３膨脹室から大気放出管を介して排気が大気に放出されるようにしたので、請求項１の発明と同等の効果を達成する上に、下流側膨張室の加工性の向上から下流側膨張室の設計が容易となり、消音効果を一層高めることができ、かつ所望のデザインに設定するのが容易である。
【００３３】
また特に請求項３の発明によれば、前記請求項１記載のものにおいて、前記挿入口は、車体フレーム上のシートの着座位置の下方にあり、また消音ケースの前半部分は車体フレームに対して左右幅が上下幅よりも幅狭な偏平形状に形成されており、前記着座位置に着座する乗員の脚部が、消音器の前半部分の外側方に位置するようにしたので、前記請求項１の発明と同等の効果を達成する上に、シート上に着座する乗員の脚部周囲の、車両の横幅を狭くすることができ、乗員の足つき性を大幅に向上させることができる。
【図面の簡単な説明】
【図１】 本発明排気装置を備えた自動二輪車の側面図
【図２】 図１の２線矢視平面図
【図３】 排気装置の一部破断平面図
【図４】 図３の４−４線に沿う断面図
【図５】 図４の５−５線に沿う拡大断面図
【図６】 図４の６−６線に沿う拡大断面図
【図７】 図４の７−７線に沿う拡大断面図
【図８】 図４の８−８線に沿う拡大断面図
【図９】 図４の９−９線に沿う拡大断面図
【図１０】 図４の１０−１０線に沿う拡大断面図
【符号の説明】
３・・・・消音ケース
３Ｆ・・・前半部分
３Ｒ・・・後半部分
４・・・・内側板半体
５・・・・外側板半体
１２・・・第１隔壁
１３・・・第２隔壁
Ｃ1 ・・・上流側膨張室（第１膨張室）
Ｃ2 ・・・下流側膨張室（第２膨張室）
Ｃ3 ・・・下流側膨張室（第３膨張室）
Ｅ・・・・エンジン
Ｆ・・・・車体フレーム
Ｍ・・・・消音器
Ｐｅ・・・排気管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust device for a straddle-type vehicle, mainly a straddle-type motorcycle.
[0002]
[Prior art]
In general, an exhaust system of a saddle-ride type motorcycle is configured by connecting a silencer to the downstream end of an exhaust pipe connected to an exhaust port of an engine, and this exhaust system is disposed along the longitudinal direction of the body frame. In the system, there is a tendency to increase the capacity of the silencer for the purpose of enhancing the effect of reducing the exhaust noise. On the other hand, it may be necessary to increase the length of the exhaust pipe due to the requirement of engine characteristics. In such a case, since the total length of the exhaust system is naturally limited, conventionally, in order to increase the total length of the exhaust pipe while ensuring the capacity of the silencer,
(1) This exhaust pipe is detoured forward and backward in front of the silencer.
[0003]
(2) An expansion chamber for accommodating the exhaust collecting pipe is provided in series between the exhaust pipe and the silencer (see Japanese Patent Publication No. 6-50052).
[0004]
It was common to use technical means.
[0005]
[Problems to be solved by the invention]
By the way, if the technical means of (1) is adopted, there is a problem that exhaust resistance is forced to increase, which not only causes a decrease in engine efficiency but also damages the appearance of the entire motorcycle. If this technical means is adopted, the length of the exhaust pipe is restricted by the silencer, and there is a problem that a substantial silencing capacity cannot be sufficiently secured even if the silencer has a large outer shape.
[0006]
The present invention has been made in view of such circumstances, and is a novel saddle that can solve the above-mentioned problem by making the overall length of the exhaust pipe as long as possible while ensuring the necessary capacity as a silencer. The main object is to provide an exhaust device for a type vehicle.
[0007]
[Means for Solving the Problems]
According to the invention of the claim 1, is connected to an exhaust port of an engine mounted on the body frame to connect the muffler to the downstream end of the exhaust pipe, the muffler is in one side of the body frame, the vehicle body In the exhaust system of the saddle riding type vehicle, which is provided along the longitudinal direction of the frame, the downstream end of the exhaust pipe is inserted into the silencing case through the insertion port provided in the middle portion in the longitudinal direction of the silencing case , The silencing case is made of a metal plate material and is formed by joining outer half plates, and is connected to the rear end of the front half portion and the front half portion. The latter half portion is formed with an upstream expansion chamber into which the downstream end of the exhaust pipe is directly opened and exhaust gas directly flows from the exhaust pipe, and the front half portion The upstream expansion chamber A downstream expansion chamber into which the exhaust gas flows is formed, and a front portion of the downstream expansion chamber from the insertion port is upstream of the insertion port of the exhaust pipe located outside the silencer case. It is characterized by extending in the front-rear direction along with the part, and according to such a feature, the required capacity of the silencer is secured while setting the total length of the exhaust pipe to a predetermined length considering the engine performance The engine performance and the silencer performance can be improved, and the exhaust system does not impair the appearance and appearance of the entire vehicle. In addition, the upstream expansion chamber into which the exhaust from the exhaust pipe directly flows is made cylindrical to ensure sufficient rigidity to further enhance the silencing effect, while the downstream expansion chamber is formed by coupling the inner and outer plate halves. As a result, the muffler can be easily processed and the entire muffler can be easily designed .
[0008]
Further, according to the invention described in claim 2 , the downstream expansion chamber is divided by dividing the inside of the muffling case into the front half part which is flat in the left-right direction. A first partition and a second partition that divides the boundary between the front half part and the cylindrical rear half part back and forth are provided, and a first partition that serves as the upstream expansion chamber is located behind the second partition. An expansion chamber is also provided on the front side of the first partition wall, and a second expansion chamber into which exhaust from the first expansion chamber is guided further on the rear side of the first partition wall and on the front side of the second partition wall. The third expansion chamber into which the exhaust from the two expansion chambers is guided is defined, and the exhaust is discharged from the third expansion chamber to the atmosphere through the atmospheric discharge pipe. according if, in order to achieve the invention the same effect of the first aspect, the downstream expansion chamber Engineering improvement second and third can be easily designed expansion chamber from the silencing effect can be further enhanced, and it is easy to set to a desired design.
[0009]
Further, according to the invention of claim 3, in the invention of claim 1 , the insertion port is below the seating position of the seat on the vehicle body frame, and the front half portion of the silencing case is relative to the vehicle body frame. The left and right width is formed in a flat shape narrower than the vertical width, and the occupant's leg seated at the seating position is located outside the front half of the silencer, according to this aspect, the above to achieve the first aspect of the invention the same effect, around the occupant's legs seated on the seat, it is possible to narrow the width of the vehicle, improving the occupant Nostoc verrucosum property Can be made.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0011]
This embodiment is an embodiment in which the present invention is applied to a saddle type motorcycle. In the following description, front and rear, left and right, and top and bottom refer to the traveling direction of the motorcycle.
[0012]
FIG. 1 is a side view of a motorcycle equipped with an exhaust device of the present invention, FIG. 2 is a plan view taken along line 2 in FIG. 1, FIG. 3 is a partially broken plan view of the exhaust device, and FIG. 4 is an enlarged sectional view taken along line 5-5 in FIG. 4, FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 4, and FIG. 8 is an enlarged sectional view taken along line 7-7, FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. 4, FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. 4, and FIG. 4 is an enlarged cross-sectional view taken along line 10-10 of FIG.
[0013]
In FIGS. 1 and 2, a traveling engine E is suspended at the front portion of a body frame F of the saddle type motorcycle, and a fuel tank T and a seat S are mounted in tandem before and after the upper surface of the body frame. Yes. Just below the fuel tank T, an exhaust port P is opened in front of the head of the engine E, and an exhaust system Ex is connected to the exhaust port P.
[0014]
When the engine E has multiple cylinders, an exhaust system is connected to the exhaust port via an exhaust manifold.
[0015]
The exhaust pipe Pe constituting the main part of the exhaust system Ex is composed of an upstream exhaust pipe 1 and a downstream exhaust pipe 2, and a connection flange 1 provided integrally at the upstream end of the upstream exhaust pipe 1. 1 is connected to the exhaust port P of the engine E. The upstream exhaust pipe 1 extends from the front of the engine E to the rear of the vehicle body frame F through one side (right side) of the engine E, and its rear end faces above the rear wheel of the motorcycle. The upstream end of the upstream side exhaust pipe 1 is connected to the front end of the downstream side exhaust pipe 2 so as to be integrated therewith. The downstream side exhaust pipe 2 extends to the rear of the vehicle body frame F. the directly under the sheet S, is inserted into the middle portion of the muffler M to be described later, the downstream end is opened to the upstream side expansion chamber or first expansion chamber C 1 of the muffler M.
[0016]
Next, the structure of the silencer M will be described with reference to FIGS.
[0017]
The silencer M extends in the front-rear direction directly below the seat S, and an intermediate portion thereof is suspended and supported by the vehicle body frame F via the hanger H, and its front end extends to the bottom of the fuel tank T. . The silencer case 3 of the silencer M is formed in a hollow cylindrical shape that is long in the front-rear direction, and most of the front half part 3F that is formed flat in the left-right direction of the body frame F in order to reduce the lateral width in the left-right direction. At the rear end, the front end of the rear half portion 3R formed of a cylindrical body is integrally fitted and connected to ensure high rigidity. The upper surface of this connecting portion is used for suspension to the vehicle body frame F. The hanger H is integrally formed to protrude.
[0018]
The front half portion 3F is formed by fitting and joining the inner plate half 4 and the outer plate half 5 formed by metal mold processing by means of welding or the like, that is, FIGS. As shown in FIGS. 7 and 8, the inner plate edges 4 of the flat cross-sectional inner plate 4 close to the vehicle body frame F and the outer plate half 5 of the outer circular arc cross-section on the side away from the inner plate half F are mutually connected. Fitted and joined together to form a cross-sectional monaca shape, as shown in FIG. 3, the flattening ratio in the left-right direction gradually decreases from the front end to the rear end, as seen from the top surface As the shape goes from the front to the rear, the width gradually increases. The latter half 3R is formed of a cylindrical body having an equal diameter over its entire length, and an inner 7 made of a metal plate made of a punch metal is sandwiched between glass wool 8 and an inner surface of an outer 6 made of a cylindrical metal plate. A tail plate 10 is integrally coupled to the rear end of the opening of the body portion 9 made of a laminated double pipe.
[0019]
The silencing case 3 includes a first partition wall 12 that divides the front half portion 3F flat in the left-right direction back and forth, and a second partition wall 13 that partitions a boundary portion between the front half portion 3F and the cylindrical rear half portion 3R back and forth. The second partition 3 is partitioned into the second, third, and first expansion chambers C 2 , C 3, and C 1 from the front end toward the rear end by the third partition wall 14 that partitions the rear portion in the rear half portion 3R. . The first expansion chamber C 1 is constituted the upstream expansion chamber exhaust from the exhaust pipe Pe flows directly located at the rear of the muffler M, the second half of the cylindrical shape as shown in FIGS. 4-6 In the portion 3R, the body portion 9 and the second and third partition walls 13 and 14 are defined. As shown in FIG. 5, the vicinity of the first partition wall 12 in the first expansion chamber C 1, and the porous plate 15 across the first expansion chamber C 1 is fixed, the first expansion chamber C 1 Exhaust gas flowing through the gas passes through the perforated plate 15 and is diffused. Further, as described later, the downstream end of the downstream side exhaust pipe 2 communicates with the first expansion chamber C 1 . Between the third partition wall 14 and the tail plate 10, a reinforcing plate 19 joined to the third partition wall 14 is interposed.
[0020]
The second and third expansion chambers constitute a downstream expansion chamber into which exhaust gas from the first expansion chamber C 1 as an upstream expansion chamber flows in order, and the second expansion chamber C 2 is a muffler case. 3 and is formed by the outer side plate halves 4 and 5 and the first partition wall 12 and forms a front half portion 3F. As shown in FIG. The inner plate 17 made of a punching plate is integrally joined to the left and right inner surfaces of the second expansion chamber C 2 with the glass wool 16 interposed therebetween. Further, the third expansion chamber C 3 is in the front-rear direction intermediate portion of the silencer casing 3, among which forms the front half portion 3F, the outer panel half 4, 5, the said first and second partition wall 12, 13 As shown in FIG. 7, the cross section is formed in a flat shape having a width wider than that of the second expansion chamber C 2 in the left-right direction.
[0021]
The first expansion chamber C 1 at the rear part of the muffler case 3 and the second expansion chamber C 2 at the front part thereof are straightly supported by the first and second partition walls 12 and 13 and the porous plate 15. The second expansion chamber C 2 and the rear third expansion chamber C 3 are mutually connected by a second communication tube 22 supported by the first partition wall 12. Further, the third expansion chamber C 3 is communicated with the atmosphere by the atmosphere discharge pipe 24 supported by the second partition wall 13, the reinforcing plate 19 and the tail plate 10. As shown in FIG. 9, a sound absorbing tube 26 having glass wool 25 laminated on the inner surface is attached to the rear portion of the atmospheric discharge pipe 24, and a large number of small tubes are provided on the portion of the atmospheric discharge pipe 24 facing the glass wool 25. A hole 24 1 is formed so that the noise of the exhaust gas flowing through the atmospheric discharge pipe 24 flows through the sound absorbing cylinder 26 and is reduced.
[0022]
As clearly shown in FIG. 4, an insertion port 28 communicating with the second expansion chamber C 2 is opened downward on the lower surface of the front portion of the silencer case 3, and the exhaust pipe Pe is passed through the insertion port 28. The downstream exhaust pipe 2 is inserted into the silencer M, and an intermediate portion of the downstream exhaust pipe 2 is supported by the insertion port 28. Most of the downstream exhaust pipe 2 , that is , a portion downstream of the insertion port 28 is inserted into the silencer M, and extends backward in the silencer M along the longitudinal direction. The two partition walls 12 and 13 are supported through. And that the downstream end thereof is open to the muffler M first expansion chamber C 1 of the rear. In the third expansion chamber C 3 , a sound absorbing cylinder 30 having glass wool 29 attached to the inner surface is wound around a part of the outer periphery of the downstream exhaust pipe 2, and the downstream exhaust pipe facing the glass wool 29 is wound. 2 is provided with a large number of small holes 31 so that the exhaust noise of the exhaust gas flowing through the downstream exhaust pipe 2 can be absorbed and reduced by the sound absorbing cylinder 30. In addition, the front portion of the second expansion chamber C 2 with respect to the insertion port 28 is aligned with the upstream portion of the downstream exhaust pipe 2 and the upstream exhaust pipe 1 that are located outside the silencing case 3 with respect to the insertion port 28. , Extending in the front-rear direction.
[0023]
As shown in FIGS. 4 and 10, a mounting bracket 33 to the vehicle body frame F is integrally provided in the vicinity of the connection portion of the downstream exhaust pipe 2 to the upstream exhaust pipe 1, and this bracket 33 is provided on the vehicle body. It is attached to the rear part of the frame F.
[0024]
As shown in FIGS. 1 and 2, the outer surface of the silencer M is covered by a protector 35 having an arcuate cross section, and the front and rear portions of the protector 35 are mounted on a vehicle body frame by attachments 36 and 37 such as attachment bolts. It is fixed to the F.
[0025]
Next, the operation of this embodiment will be described.
[0026]
The engine E is now operated, and the exhaust discharged from the engine E passes through the upstream exhaust pipe 1 and the downstream exhaust pipe 2 of the exhaust pipe Pe and flows into the first expansion chamber C 1 at the rear of the silencer M. The exhaust gas that has entered the silencer M passes from the first expansion chamber C 1 through the first communication pipe 21 and flows into the second expansion chamber C 2 , and further passes through the second communication pipe 22 from there. 3 flows into the expansion chamber C 3 , during which the exhaust is repeatedly expanded and contracted to effectively reduce the sound. Then, the sound-exhausted exhaust that has entered the third expansion chamber C 3 is discharged to the atmosphere through the atmosphere discharge pipe 24.
[0027]
By the way, since the downstream side exhaust pipe 2 is inserted into the silencer M from the middle part in the front-rear direction of the silencer M and extends in the front-rear direction, the entire length of the exhaust pipe Pe is made as long as possible. In addition, the exhaust pipe can be formed to a length required in terms of engine performance, and the exhaust pipe can be formed to a length required for the performance of the engine. Making the length longer does not reduce the muffler capacity of the silencer.
[0028]
Further, the silencer M has a latter half portion 3R formed of a cylindrical body capable of ensuring sufficient rigidity, and exhaust gas having a high exhaust noise from the exhaust pipe Pe directly flows into the latter half portion 3R. The exhaust noise can be effectively reduced, and the first half portion 3F formed by joining the inner and outer plate halves 4 and 5 made of a metal plate is formed by the latter half portion 3R made of a rigid cylindrical body. It is possible to effectively reduce the exhaust gas, which has been primarily reduced in sound, in a secondary manner, and the front half portion 3F is formed by coupling the inner and outer plate halves 4 and 5 to thereby form the front half portion 3F. Although not so rigid, the processability can be improved, and the entire silencer can be easily designed.
[0029]
The connecting portion between the downstream end of the exhaust pipe Pe and the silencer M, that is, the insertion port 28 is below the seating position of the seat S on the vehicle body frame F, and the front half portion 3F of the silencer case 3 is the vehicle body. An occupant's leg portion, which is formed in a flat shape with a lateral width smaller than the vertical width with respect to the frame F and seated at the seating position of the seat S, is located on the outer side of the front half portion 3F of the silencer M. Thus, the lateral width of the vehicle around the occupant's legs can be reduced, and the occupant's footing performance can be improved.
[0030]
As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the above-described embodiment, the case where the device of the present invention is applied to the exhaust system of a saddle type motorcycle has been described. However, the present invention can be applied to an exhaust system of another saddle type vehicle such as a saddle type motorcycle. Of course, in the above embodiment, the first expansion chamber as the upstream expansion chamber is provided in the first half of the silencer, and the second and third expansion chambers as the downstream expansion chambers are provided in the second half thereof. However, two or more upstream expansion chambers may be formed in the latter half portion, and one or three or more downstream expansion chambers may be formed in the first half portion.
[0031]
【The invention's effect】
According to the first aspect of the present invention, the downstream end of the exhaust pipe is inserted into the silencing case through the insertion port provided in the front-rear direction intermediate portion of the silencing case, and is extended to the rear side of the silencing case. Is composed of a metal plate material, and is composed of a front half portion formed by joining outer half plates and having an insertion port, and a rear half portion formed from a cylindrical body connected to the rear end of the front half portion. An upstream expansion chamber into which the downstream end of the exhaust pipe opens directly and exhaust from the exhaust pipe directly flows is formed, and downstream expansion in which exhaust from the upstream expansion chamber flows into the first half portion. A chamber is formed, and the front part of the downstream expansion chamber from the insertion port extends in the front-rear direction, along with the upstream part of the exhaust pipe located outside the silencer case , The total length of the exhaust pipe is a predetermined length considering the engine performance. The required capacity of the silencer can be ensured while setting to, the engine performance and the silencer performance can be improved, and in addition, the exhaust system may impair the appearance and appearance of the entire vehicle. Not . Moreover , the downstream expansion chamber is formed by coupling the inner and outer plate halves while further enhancing the silencing effect by securing the sufficient rigidity by making the upstream expansion chamber into which exhaust from the exhaust pipe directly flows into a cylindrical body. This facilitates the processing of the silencer and further facilitates the design of the entire silencer.
[0032]
In particular , according to the invention of claim 2 , the silencing case has a first partition that divides the downstream expansion chamber by dividing the inside of the front half flat in the left-right direction into the front and rear, the front half, and the cylindrical rear half. A second partition wall that divides the boundary portion between the first partition wall and the first partition chamber, and a first expansion chamber that serves as an upstream expansion chamber is disposed behind the second partition wall, and the first expansion chamber is disposed on the front side of the first partition wall. A second expansion chamber into which exhaust from the expansion chamber is guided is further defined on the rear side of the first partition and on the front side of the second partition, and a third expansion chamber to which exhaust from the second expansion chamber is guided. Since the exhaust gas is discharged from the third expansion chamber through the atmospheric discharge pipe to the atmosphere, the same effect as that of the invention of claim 1 can be achieved, and the workability of the downstream expansion chamber can be improved. The design of the expansion chamber on the downstream side becomes easy due to the improvement, the sound-deadening effect can be further enhanced, and the desired design It is easy to set up.
[0033]
According particularly to the third aspect of the invention, in those of claim 1, wherein the insertion opening is located below the seating position of the seat on the vehicle body frame and the first half of the silencer casing to the vehicle body frame horizontal width are formed on the narrow flat shape than the vertical width, the legs of the occupant seated in the seating position, and to be positioned in the outer side of the first part of the muffler, claim 1 In addition to achieving the same effect as the present invention, the lateral width of the vehicle around the legs of the occupant seated on the seat can be narrowed, and the occupant footing can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle equipped with an exhaust device of the present invention. FIG. 2 is a plan view taken along line 2 in FIG. 1. FIG. 3 is a partially broken plan view of the exhaust device. 4 is an enlarged sectional view taken along line 5-5 in FIG. 4. FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 4. FIG. 7 is taken along line 7-7 in FIG. FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. 4. FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. 4. FIG. 10 is enlarged along line 10-10 in FIG. Sectional view [Explanation of symbols]
3 .... Silencer case 3F ... First half 3R ... Second half 4 ... Inner plate half 5 ... Outer plate half
12 ... 1st partition
13 ... second partition C 1 ... upstream expansion chamber (first expansion chamber)
C 2 ... downstream expansion chamber (second expansion chamber)
C 3 ... downstream expansion chamber (third expansion chamber)
E ... Engine F ... Body frame M ... Silencer Pe ... Exhaust pipe

Claims (3)

車体フレーム（Ｆ）に搭載されるエンジン（Ｅ）の排気ポート（Ｐ）に接続された排気管（Ｐｅ）の下流端に消音器（Ｍ）を接続し、その消音器（Ｍ）が車体フレーム（Ｆ）の一側方において、該車体フレーム（Ｆ）の前後方向に沿設されてなる、鞍乗型車両の排気装置において、
前記排気管（Ｐｅ）の下流端を、前記消音器（Ｍ）の消音ケース（３）の前後方向中間部に設けた挿入口（２８）を通して該消音ケース（３）内に挿入して、該挿入口（２８）よりも後側に延ばし、
前記消音ケース（３）は、金属板材よりなる内、外板半体（４，５）の結合により形成され前記挿入口（２８）を有する前半部分（３Ｆ）と、この前半部分（３Ｆ）の後端に接続され円筒体より形成される後半部分（３Ｒ）とよりなり、
前記後半部分（３Ｒ）には、前記排気管（Ｐｅ）の下流端が直接開口して該排気管（Ｐｅ）からの排気が直接流入する上流側膨張室（Ｃ 1 ）が形成されると共に、前記前半部分（３Ｆ）には、前記上流側膨張室（Ｃ 1 ）からの排気が流入する下流側膨張室（Ｃ 2 ，Ｃ 3 ）が形成され、
その下流側膨張室（Ｃ 2 ，Ｃ 3 ）の、前記挿入口（２８）よりも前側部分は、前記消音ケース（３）の外側に位置する前記排気管（Ｐｅ）の、前記挿入口（２８）よりも上流側部分と並んで、前後方向に延びていることを特徴とする、鞍乗型車両の排気装置。A silencer (M) is connected to the downstream end of an exhaust pipe (Pe) connected to an exhaust port (P) of an engine (E) mounted on the body frame (F), and the silencer (M) is connected to the body frame. (F) In one side of the exhaust device for a saddle-ride type vehicle, which is provided along the longitudinal direction of the body frame (F),
The downstream end of the exhaust pipe (Pe) is inserted into the silencer case (3 ) through the insertion port (28) provided in the middle part in the front-rear direction of the silencer case (3) of the silencer (M) , Extend behind the insertion slot (28),
The muffling case (3) is made of a metal plate material, and is formed by joining the outer plate halves (4, 5), and has a front half (3F) having the insertion port (28), and the front half (3F). It consists of the latter half part (3R) formed from the cylindrical body connected to the rear end,
In the latter half part (3R), the downstream end of the exhaust pipe (Pe) is directly opened to form an upstream side expansion chamber (C 1 ) into which exhaust from the exhaust pipe (Pe) flows directly , and In the first half (3F), downstream expansion chambers (C 2 , C 3 ) into which exhaust from the upstream expansion chamber (C 1 ) flows are formed,
The downstream side expansion chamber (C 2 , C 3 ) has a front side portion from the insertion port (28), and the insertion port (28) of the exhaust pipe (Pe) located outside the silencer case (3). An exhaust device for a saddle-ride type vehicle, which extends in the front-rear direction in parallel with the upstream portion . 前記消音ケース（３）内は、左右方向に偏平な前記前半部分（３Ｆ）内を前後に仕切ることで前記下流側膨脹室を分割する第１隔壁（１２）と、前記前半部分（３Ｆ）と円筒状の前記後半部分（３Ｒ）との境界部分を前後に仕切る第２隔壁（１３）とが設けられていて、該第２隔壁（１３）の後側に前記上流側膨張室となる第１膨脹室（Ｃ 1 ）が、また該第１隔壁（１２）の前側に、該第１膨脹室（Ｃ 1 ）からの排気が導かれる第２膨脹室（Ｃ 2 ）が、さらに該第１隔壁（１２）の後側で且つ該第２隔壁（１３）の前側に、該第２膨脹室（Ｃ 2 ）からの排気が導かれる第３膨脹室（Ｃ 3 ）がそれぞれ画成され、その第３膨脹室（Ｃ 3 ）から大気放出管（２４）を介して排気が大気に放出されるようにしたことを特徴とする、前記請求項１記載の鞍乗型車両の排気装置。 The silencing case (3) includes a first partition (12) that divides the downstream expansion chamber by dividing the front half (3F) flat in the left-right direction into front and rear, and the front half (3F). A second partition wall (13) that partitions the boundary portion with the cylindrical rear half portion (3R) forward and backward is provided, and a first partition that serves as the upstream expansion chamber is provided behind the second partition wall (13). An expansion chamber (C 1 ) is provided on the front side of the first partition wall (12), and a second expansion chamber (C 2 ) through which exhaust gas from the first expansion chamber (C 1 ) is guided is further provided on the first partition wall. (12) A third expansion chamber (C 3 ) into which exhaust from the second expansion chamber (C 2 ) is guided is defined on the rear side and on the front side of the second partition wall (13) . 3 exhaust expansion chamber from (C 3) through the air discharge pipe (24) is characterized in that it has to be released into the atmosphere, the claim 1, wherein Exhaust system of a straddle-type vehicle. 前記挿入口（１８）は、車体フレーム（Ｆ）上のシート（Ｓ）の着座位置の下方にあり、また前記消音ケース（３）の前半部分（３Ｆ）は車体フレーム（Ｆ）に対して左右幅が上下幅よりも幅狭な偏平形状に形成されており、前記着座位置に着座する乗員の脚部が、消音器ケースの前半部分（３Ｆ）の外側方に位置するようにしたことを特徴とする、前記請求項１記載の鞍乗型車両の排気装置。The insertion opening (18) is below the seating position of the seat (S) on the vehicle body frame (F), and the front half (3F) of the silencer case (3) is left and right with respect to the vehicle body frame (F). It is formed in a flat shape whose width is narrower than the vertical width, and a leg portion of an occupant seated at the seating position is located on the outer side of the front half portion (3F) of the silencer case. The exhaust device for a saddle riding type vehicle according to claim 1 .
JP08671798A 1998-03-31 1998-03-31 Exhaust device for saddle riding type vehicle Expired - Fee Related JP3923171B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP08671798A JP3923171B2 (en) 1998-03-31 1998-03-31 Exhaust device for saddle riding type vehicle
DE19912466A DE19912466C2 (en) 1998-03-31 1999-03-19 Exhaust system for a vehicle with a seat saddle
ES009900648A ES2156811B1 (en) 1998-03-31 1999-03-30 EXHAUST SYSTEM FOR VEHICLE OF THE TYPE OF MOUNTING CHAIR.
CN99104526A CN1107790C (en) 1998-03-31 1999-03-31 Exhaust apparatus of saddle-type vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08671798A JP3923171B2 (en) 1998-03-31 1998-03-31 Exhaust device for saddle riding type vehicle

Publications (2)

Publication Number Publication Date
JPH11280467A JPH11280467A (en) 1999-10-12
JP3923171B2 true JP3923171B2 (en) 2007-05-30

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DE (1) DE19912466C2 (en)
ES (1) ES2156811B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6408980B1 (en) * 2000-03-02 2002-06-25 Mark W. Dooley Exhaust pipe and muffler for motorcycle that does not heat discolor
FR2883921B1 (en) * 2005-04-05 2010-06-11 Faurecia Sys Echappement MUTE FOR EXHAUST LINE MUFFLERS
JP6145310B2 (en) * 2013-05-22 2017-06-07 川崎重工業株式会社 Motorcycle exhaust pipe side cover
WO2022168533A1 (en) * 2021-02-03 2022-08-11 富士フイルム株式会社 Silencing structure and silencing system

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Publication number Priority date Publication date Assignee Title
JPS5664114A (en) * 1979-10-31 1981-06-01 Yamaha Motor Co Ltd Exhaust muffler
DE3308130A1 (en) * 1983-03-08 1984-09-13 Friedrich Boysen Gmbh & Co Kg, 7272 Altensteig Rear silencer
JPH0650052B2 (en) * 1984-12-10 1994-06-29 ヤマハ発動機株式会社 Motorcycle exhaust system
AT394887B (en) * 1985-06-19 1992-07-10 Sebring Auspuff EXHAUST SILENCER
JPH0643452Y2 (en) * 1988-02-08 1994-11-14 株式会社三五 Silencer
JP3038763B2 (en) * 1990-03-14 2000-05-08 スズキ株式会社 Muffler for internal combustion engine
FR2678681B1 (en) * 1991-07-01 1995-03-17 Boet Andre MUFFLER FOR EXPLOSION ENGINES.

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DE19912466A1 (en) 1999-10-07
JPH11280467A (en) 1999-10-12
ES2156811A1 (en) 2001-07-16
CN1230626A (en) 1999-10-06
DE19912466C2 (en) 2002-12-12
ES2156811B1 (en) 2001-12-16
CN1107790C (en) 2003-05-07

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