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JP2004026009A - Exhaust device for motorcycle - Google Patents

Exhaust device for motorcycle Download PDF

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Publication number
JP2004026009A
JP2004026009A JP2002185007A JP2002185007A JP2004026009A JP 2004026009 A JP2004026009 A JP 2004026009A JP 2002185007 A JP2002185007 A JP 2002185007A JP 2002185007 A JP2002185007 A JP 2002185007A JP 2004026009 A JP2004026009 A JP 2004026009A
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Japan
Prior art keywords
muffler
engine
vehicle body
motorcycle
step floor
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Granted
Application number
JP2002185007A
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JP3699423B2 (en
Inventor
Masahiko Takenaka
竹中　正彦
Takuhei Kusano
草野　拓平
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2002185007A priority Critical patent/JP3699423B2/en
Priority to CNB031380379A priority patent/CN100344474C/en
Publication of JP2004026009A publication Critical patent/JP2004026009A/en
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Publication of JP3699423B2 publication Critical patent/JP3699423B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To improve the weight balance of a body with no constraint in design by improving an exhaust device for a motorcycle. <P>SOLUTION: On the motorcycle which has a pair of step floors 41, 42 arranged between handle bars and a driver's seat for a driver to put his feet thereon and tied with a swollen portion 58 swollen upward and an engine 16 partially arranged in the swollen portion 58, a muffler 21 connected to the engine 16 via an exhaust pipe 53 and arranged at the lower part of one step floor 41 of the step floors 41, 42. Thus, the muffler can be arranged nearly at a center in the longitudinal direction of the body for improving the longitudinal weight balance of the body. Furthermore, no constraint exists in design such as the arrangement of heavy materials on the body, as conventionally experienced when the muffler is arranged at the rear part of the body, increasing a degree of freedom in body design. <P>COPYRIGHT: (C)2004,JPO

Description

【特許請求の範囲】
【請求項１】ハンドルとシートとの間に運転者が足を載せる一対のステップフロアを配置し、これらのステップフロアを上方へ膨出させた膨出部で繋ぎ、この膨出部内にエンジンの一部を配置した自動二輪車において、
前記エンジンに排気管を介して接続したマフラを、前記ステップフロアのうちの一方の下方に配置したことを特徴とする自動二輪車の排気装置。
【請求項２】前記マフラを一方のステップフロアの下方に配置したときに、エンジンの出力軸に連結するベルト式無段変速機を他方のステップフロアの下方に配置したことを特徴とする請求項１記載の自動二輪車の排気装置。
【請求項３】前記マフラの側方を、前記ステップフロア側部の縁から下方に延ばしたロアカバーで覆ったことを特徴とする請求項１又は請求項２記載の自動二輪車の排気装置。
【請求項４】車体フレームの下部に、エンジンとこのエンジンの出力軸に連結したベルト式無段変速機とから構成するパワーユニットを取付け、ハンドルとシートとの間に運転者が足を載せるステップフロアを配置し、前記エンジンに排気管を介して接続したマフラを、前記ステップフロアの下方に配置したことを特徴とする自動二輪車の排気装置。
【請求項５】前記マフラをエンジンの一方の側方に配置し、ベルト式無段変速機をエンジンの他方の側方に配置したことを特徴とする請求項４記載の自動二輪車の排気装置。
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】
本発明は、車体の重量バランスを向上させ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】
自動二輪車の排気装置としては、例えば、特開平１１−３０１５６４号公報「自動二輪車の後輪支持構造」に記載されたものが知られている。
上記公報の図１を以下の図５で説明する。なお、符号は振り直した。
図５は従来の自動二輪車の排気装置を示す側面図であり、自動二輪車の車体の中央部にエンジン１０１を配置し、このエンジン１０１から後方に排気管１０２を延ばし、この排気管１０２の後端であって後輪１０３の側方にマフラー１０４を設けた排気装置が記載されている。
【０００３】
【発明が解決しようとする課題】
自動二輪車では、車体の重心が前後左右方向の中央部に位置する方が重量バランスが向上する。
上記の自動二輪車では、比較的重量の大きなマフラー１０４が車体の後方に配置してあり、車体の重心が後ろ寄りになるため、車体前後方向の重量バランスを向上すべく、車体の重心が中央部に位置するように、車体の前側に重量物を配置する等の、設計上の制約を受ける。
【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、設計上の制約を受けることなく車体の重量バランスを向上させることにある。
【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、ハンドルとシートとの間に運転者が足を載せる一対のステップフロアを配置し、これらのステップフロアを上方へ膨出させた膨出部で繋ぎ、この膨出部内にエンジンの一部を配置した自動二輪車において、エンジンに排気管を介して接続したマフラを、ステップフロアのうちの一方の下方に配置したことを特徴とする。
【０００６】
ステップフロアは、車体の前後のほぼ中央に位置するため、マフラをステップフロアの下方に配置することで、マフラを車体前後方向のほぼ中央に配置することができ、車体の前後の重量バランスを向上させることができる。これにより、従来のような車体設計上の制約を受けることがない。
【０００７】
請求項２は、マフラを一方のステップフロアの下方に配置したときに、エンジンの出力軸に連結するベルト式無段変速機を他方のステップフロアの下方に配置したことを特徴とする。
ベルト式無段変速機とマフラとを車体の左右に振り分けて配置することができ、車体の左右の重量バランスを向上させることができる。
【０００８】
請求項３は、マフラの側方を、ステップフロア側部の縁から下方に延ばしたロアカバーで覆ったことを特徴とする。
マフラの側方をロアカバーで覆うため、マフラが外部に露出しなくなり、マフラの外観性を向上させる必要がなくなって、マフラのコストを低減することができる。
【０００９】
請求項４は、車体フレームの下部に、エンジンとこのエンジンの出力軸に連結したベルト式無段変速機とから構成するパワーユニットを取付け、ハンドルとシートとの間に運転者が足を載せるステップフロアを配置し、エンジンに排気管を介して接続したマフラを、ステップフロアの下方に配置したことを特徴とする。
【００１０】
ステップフロアは、車体の前後のほぼ中央に位置するため、マフラをステップフロアの下方に配置することで、マフラを車体前後方向のほぼ中央に配置することができ、車体の前後の重量バランスを向上させることができる。これにより、従来のような車体設計上の制約を受けることがない。
【００１１】
請求項５は、マフラをエンジンの一方の側方に配置し、ベルト式無段変速機をエンジンの他方の側方に配置したことを特徴とする。
ベルト式無段変速機とマフラとを車体の左右に振り分けて配置することができ、車体の左右の重量バランスを向上させることができる。
【００１２】
【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、車体フレーム１１の前端にヘッドパイプ１２を取付け、このヘッドパイプ１２に操舵可能にフロントフォーク１３を取付け、このフロントフォーク１３の下部に前輪１４を取付け、フロントフォーク１３の上部にハンドル１５を取付け、車体フレーム１１の前部にエンジン１６を取付け、車体フレーム１１の後部に上下スイング可能にスイングアーム１７を取付け、このスイングアーム１７の後端に後輪１８を取付け、エンジン１６の側方にマフラ２１を配置した車両である。
【００１３】
ここで、３１はフロントフェンダ、３２はフロントカバー、３３はウインドスクリーン、３４はフロントインナカバー、３５は運転者用シート、３６は同乗者用シート、３７は燃料タンク、３８はリヤフェンダである。また、４１，４２（奥側の符号４２は不図示）は運転者が足を載せるステップフロアであり、ステップフロア４１の下方にマフラ２１を配置する。
【００１４】
図２は本発明に係る自動二輪車の平面図であり、車体フレーム１１の下部に、エンジン１６とこのエンジン１６の出力軸に連結したベルト式無段変速機５１とから構成するパワーユニット５２を取付け、エンジン１６の右側にベルト式無段変速機５１を配置するとともに、エンジン１６の左側にマフラ２１を配置したことを示す。
【００１５】
図中の５３はエンジン１６から右方に延ばし、更にパワーユニット５２の側方を後方へ延ばし、更にパワーユニット５２の後部下方を通ってマフラ２１の後端に接続した排気管、５４はマフラ２１の後端に設けたテールパイプである。
上記の排気管５３、マフラ２１及びテールパイプ５４は、本発明の排気装置５５を構成する部品である。
【００１６】
この実施の形態において、排気管５３をエンジン１６から左側方に延ばしてマフラ２１の前端部に接続してもよいが、図示したように、パワーユニット５２の右側方を通すことで排気管５３の全長をより大きくすることができ、所望の消音性能を得やすくすることができる。
【００１７】
図３は本発明に係る排気装置及びパワーユニットを示す斜視図であり、エンジン１６の右側部から後方へベルト式無段変速機５１を延ばし、このベルト式無段変速機５１の更に右側方に排気管５３を配置し、エンジン１６の左側方にマフラ２１を配置したことを示す。
【００１８】
図４は本発明に係る自動二輪車のステップフロアの横断面図（白抜き矢印ｌｅｆｔは車体左方、白抜き矢印ｒｉｇｈｔは車体右方を示す。）であり、左右一対のステップフロア４１，４２間に上方へ膨出させた膨出部５８を形成し、この膨出部５８の下方にエンジン１６を配置（エンジン１６の一部は膨出部５８内に位置する。）し、このエンジン１６の左方で且つ一方のステップフロア４１の下方にマフラ２１を配置し、このマフラ２１の側方を、ステップフロア４１の側部縁部から下方に延ばしたロアカバー６１で覆い、ベルト式無段変速機５１の右方で且つ他方のステップフロア４２の下方に排気管５３を通したことを示す。なお、６４はステップフロア４２の側部縁部から下方に延ばした右側のロアカバー、６５は排気管５３に取付けた遮熱板、６６，６７はステップフロア４１，４２を支持するフロアフレームである。
【００１９】
以上の図１及び図４で説明したように、本発明は第１に、ハンドル１５と運転者用シート３５との間に運転者が足を載せる一対のステップフロア４１，４２を配置し、これらのステップフロア４１，４２を上方へ膨出させた膨出部５８で繋ぎ、この膨出部５８内にエンジン１６の一部を配置した自動二輪車１０において、エンジン１６に排気管５３を介して接続したマフラ２１を、ステップフロア４１，４２のうちの一方のステップフロア４１の下方に配置したことを特徴とする。
【００２０】
ステップフロア４１，４２は、車体の前後のほぼ中央に位置するため、マフラ２１をステップフロア４１の下方に配置することで、マフラ２１を車体前後方向のほぼ中央に配置することができ、車体の前後の重量バランスを向上させることができる。
【００２１】
従って、車体に余計なモーメントが発生しにくくなり、走行中の自動二輪車１０をよりコントロールし易くすることができる。更に、従来のようにマフラを車体の後方に配置したときに、後ろ寄りになる車体の重心を車体中央部側に位置するように車体の前側に重量物を配置する等の設計上の制約が本発明ではなくなり、車体の設計自由度を増すことができる。
【００２２】
本発明は第２に、図２及び図４で説明したように、マフラ２１を一方のステップフロア４１の下方に配置したときに、エンジン１６の出力軸に連結するベルト式無段変速機５１を他方のステップフロアの下方に配置し、また、マフラ２１をエンジン１６の一方の側方に配置したときに、ベルト式無段変速機５１をエンジン１６の他方の側方に配置したことを特徴とする。
ベルト式無段変速機５１とマフラ２１とを車体の左右に振り分けて配置することができ、車体の左右の重量バランスを向上させることができる。
【００２３】
本発明は第３に、図１及び図４で説明したように、マフラ２１の側方を、ステップフロア４１側部の縁から下方に延ばしたロアカバー６１で覆ったことを特徴とする。
【００２４】
マフラ２１の側方をロアカバー６１で覆うため、マフラ２１が外部に露出しなくなり、従来のように外観性に大きく影響する大きなマフラが外部に露出するために外観性を向上せざるを得ず、コストの上昇を招いていたのに比較して、本発明では、マフラ２１の外観性を向上させる必要がなくなり、マフラ２１のコストを低減することができる。従って、自動二輪車１０のコストを低減することができる。
【００２５】
尚、本発明の実施の形態では、図４に示したように、一方のステップフロア４１の下方にのみマフラ２１を配置したが、これに限らず、ステップフロア４１及びステップフロア４２の両方のそれぞれの下方にマフラを配置してもよい。これにより、マフラの容量を拡大することができ、所望の消音性能を得やすくすることができる。
【００２６】
【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、エンジンに排気管を介して接続したマフラを、ステップフロアのうちの一方の下方に配置したので、マフラを車体前後方向のほぼ中央に配置することができ、車体の前後の重量バランスを向上させることができる。
【００２７】
従って、従来のようにマフラを車体の後方に配置したときに、後ろ寄りになる車体の重心を車体中央部側に位置するように車体の前側に重量物を配置する等の設計上の制約が本発明ではなくなり、車体の設計自由度を増すことができる。
【００２８】
請求項２の自動二輪車の排気装置は、マフラを一方のステップフロアの下方に配置したときに、エンジンの出力軸に連結するベルト式無段変速機を他方のステップフロアの下方に配置したので、ベルト式変速機とマフラとを車体の左右に振り分けて配置することができ、車体の左右の重量バランスを向上させることができる。
【００２９】
請求項３の自動二輪車の排気装置は、マフラの側方を、ステップフロア側部の縁から下方に延ばしたロアカバーで覆ったので、マフラが外部に露出しなくなるため、マフラの外観性を向上させる必要がなくなり、マフラのコストを低減することができ、ひいては、自動二輪車のコストを低減することができる。
【００３０】
請求項４の自動二輪車の排気装置は、車体フレームの下部に、エンジンとこのエンジンの出力軸に連結したベルト式無段変速機とから構成するパワーユニットを取付け、ハンドルとシートとの間に運転者が足を載せるステップフロアを配置し、エンジンに排気管を介して接続したマフラを、ステップフロアの下方に配置したので、マフラを車体前後方向のほぼ中央に配置することができ、車体の前後の重量バランスを向上させることができる。
【００３１】
従って、従来のようにマフラを車体の後方に配置したときに、後ろ寄りになる車体の重心を車体中央部側に位置するように車体の前側に重量物を配置する等の設計上の制約が本発明ではなくなり、車体の設計自由度を増すことができる。
【００３２】
請求項５の自動二輪車の排気装置は、マフラをエンジンの一方の側方に配置し、ベルト式無段変速機をエンジンの他方の側方に配置したので、ベルト式無段変速機とマフラとを車体の左右に振り分けて配置することができ、車体の左右の重量バランスを向上させることができる。
【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及びパワーユニットを示す斜視図
【図４】本発明に係る自動二輪車のステップフロアの横断面図
【図５】従来の自動二輪車の排気装置を示す側面図
【符号の説明】
１０…自動二輪車、１５…ハンドル、１６…エンジン、２１…マフラ、３５…シート（運転者用シート）、４１，４２…ステップフロア、５１…ベルト式無段変速機、５３…排気管、５８…膨出部、６１…ロアカバー。[Claims]
1. A pair of step floors on which a driver places his / her feet are arranged between a steering wheel and a seat, and these step floors are connected by a bulging portion which bulges upward. In a motorcycle with a part arranged,
A muffler connected to the engine via an exhaust pipe is disposed below one of the step floors.
2. A belt-type continuously variable transmission connected to an output shaft of an engine is arranged below the other step floor when the muffler is arranged below one of the step floors. 2. The exhaust device for a motorcycle according to claim 1.
3. The exhaust system for a motorcycle according to claim 1, wherein a side of the muffler is covered with a lower cover extending downward from an edge of the side of the step floor.
4. A step floor in which a power unit including an engine and a belt-type continuously variable transmission connected to an output shaft of the engine is attached to a lower portion of a body frame, and a driver's foot rests between a steering wheel and a seat. And a muffler connected to the engine via an exhaust pipe is arranged below the step floor.
5. The exhaust system for a motorcycle according to claim 4, wherein the muffler is arranged on one side of the engine, and the belt-type continuously variable transmission is arranged on the other side of the engine.
DETAILED DESCRIPTION OF THE INVENTION
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motorcycle exhaust device suitable for improving the weight balance of a vehicle body.
[0002]
[Prior art]
As an exhaust device for a motorcycle, for example, one described in Japanese Patent Application Laid-Open No. H11-301564, entitled "Motorcycle Rear Wheel Support Structure" is known.
FIG. 1 of the above publication will be described with reference to FIG. The reference numerals have been re-assigned.
FIG. 5 is a side view showing a conventional exhaust system of a motorcycle, in which an engine 101 is arranged at a central portion of a body of the motorcycle, an exhaust pipe 102 extends rearward from the engine 101, and a rear end of the exhaust pipe 102 is provided. An exhaust system in which a muffler 104 is provided on the side of the rear wheel 103 is described.
[0003]
[Problems to be solved by the invention]
In a motorcycle, the weight balance is improved when the center of gravity of the vehicle body is located at the center in the front, rear, left, and right directions.
In the motorcycle described above, the muffler 104 having a relatively large weight is disposed at the rear of the vehicle body, and the center of gravity of the vehicle body is shifted toward the rear. , And there is a design constraint such as placing a heavy object on the front side of the vehicle body.
[0004]
Accordingly, an object of the present invention is to improve the weight balance of a vehicle body without being restricted by design by improving the exhaust device of a motorcycle.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is to dispose a pair of step floors on which a driver puts a foot between a steering wheel and a seat, and connect these step floors with a bulging portion that bulges upward, In the motorcycle in which a part of the engine is disposed in the bulging portion, a muffler connected to the engine via an exhaust pipe is disposed below one of the step floors.
[0006]
Since the step floor is located almost at the center of the front and rear of the vehicle body, the muffler can be placed almost at the center of the vehicle body in the front-rear direction by placing the muffler below the step floor, improving the weight balance of the front and rear of the vehicle. Can be done. Thus, there is no restriction on the vehicle body design as in the related art.
[0007]
According to a second aspect of the present invention, when the muffler is arranged below one of the step floors, the belt-type continuously variable transmission connected to the output shaft of the engine is arranged below the other step floor.
The belt-type continuously variable transmission and the muffler can be arranged separately on the left and right sides of the vehicle body, and the weight balance on the left and right sides of the vehicle body can be improved.
[0008]
A third aspect of the present invention is characterized in that the side of the muffler is covered with a lower cover extending downward from the edge of the side of the step floor.
Since the side of the muffler is covered with the lower cover, the muffler is not exposed to the outside, and it is not necessary to improve the appearance of the muffler, and the cost of the muffler can be reduced.
[0009]
A step floor in which a power unit including an engine and a belt-type continuously variable transmission connected to an output shaft of the engine is attached to a lower portion of a body frame, and a driver places his foot between a steering wheel and a seat. And a muffler connected to the engine via an exhaust pipe is arranged below the step floor.
[0010]
Since the step floor is located almost at the center of the front and rear of the vehicle body, the muffler can be placed almost at the center of the vehicle body in the front-rear direction by placing the muffler below the step floor, improving the weight balance of the front and rear of the vehicle. Can be done. Thus, there is no restriction on the vehicle body design as in the related art.
[0011]
The fifth aspect is characterized in that the muffler is arranged on one side of the engine, and the belt-type continuously variable transmission is arranged on the other side of the engine.
The belt-type continuously variable transmission and the muffler can be arranged separately on the left and right sides of the vehicle body, and the weight balance on the left and right sides of the vehicle body can be improved.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is a side view of a motorcycle provided with an exhaust device according to the present invention. In a motorcycle 10, a head pipe 12 is attached to a front end of a body frame 11, and a front fork 13 is attached to the head pipe 12 so as to be steerable. A front wheel 14 is attached to a lower portion of the front fork 13, a handle 15 is attached to an upper portion of the front fork 13, an engine 16 is attached to a front portion of the body frame 11, and a swing arm 17 is provided at a rear portion of the body frame 11 so as to be able to swing up and down. This is a vehicle in which a rear wheel 18 is attached to the rear end of the swing arm 17 and a muffler 21 is arranged beside the engine 16.
[0013]
Here, 31 is a front fender, 32 is a front cover, 33 is a windscreen, 34 is a front inner cover, 35 is a driver seat, 36 is a passenger seat, 37 is a fuel tank, and 38 is a rear fender. Reference numerals 41 and 42 (the back side reference numeral 42 is not shown) are step floors on which the driver places his / her feet, and the muffler 21 is arranged below the step floor 41.
[0014]
FIG. 2 is a plan view of the motorcycle according to the present invention. A power unit 52 including an engine 16 and a belt-type continuously variable transmission 51 connected to an output shaft of the engine 16 is attached to a lower portion of a body frame 11. This shows that the belt-type continuously variable transmission 51 is arranged on the right side of the engine 16 and the muffler 21 is arranged on the left side of the engine 16.
[0015]
An exhaust pipe 53 extends to the right from the engine 16, further extends laterally of the power unit 52 to the rear, further passes through a lower rear portion of the power unit 52 and is connected to the rear end of the muffler 21, and 54 denotes a rear end of the muffler 21. It is a tail pipe provided at the end.
The exhaust pipe 53, the muffler 21 and the tail pipe 54 are components constituting the exhaust device 55 of the present invention.
[0016]
In this embodiment, the exhaust pipe 53 may be extended to the left from the engine 16 and connected to the front end of the muffler 21, but as shown in FIG. Can be further increased, and desired silencing performance can be easily obtained.
[0017]
FIG. 3 is a perspective view showing an exhaust device and a power unit according to the present invention. The belt-type continuously variable transmission 51 extends rearward from the right side of the engine 16, and the exhaust is further rightward of the belt-type continuously variable transmission 51. This shows that the pipe 53 is arranged and the muffler 21 is arranged on the left side of the engine 16.
[0018]
FIG. 4 is a cross-sectional view of the step floor of the motorcycle according to the present invention (open arrow left indicates the left side of the vehicle body, and white arrow right indicates the right side of the vehicle body). A bulging portion 58 bulging upward is formed, and the engine 16 is disposed below the bulging portion 58 (a part of the engine 16 is located inside the bulging portion 58). A muffler 21 is disposed on the left side and below one of the step floors 41, and the side of the muffler 21 is covered with a lower cover 61 extending downward from a side edge of the step floor 41, thereby forming a belt-type continuously variable transmission. This indicates that the exhaust pipe 53 has been passed to the right of 51 and below the other step floor 42. 64 is a right lower cover extending downward from a side edge of the step floor 42, 65 is a heat shield plate attached to the exhaust pipe 53, and 66 and 67 are floor frames supporting the step floors 41 and 42.
[0019]
As described above with reference to FIGS. 1 and 4, the present invention firstly arranges a pair of step floors 41 and 42 on which the driver places his / her feet between the steering wheel 15 and the driver's seat 35. Are connected to each other via the exhaust pipe 53 in the motorcycle 10 in which a part of the engine 16 is disposed in the bulged portion 58. The muffler 21 is disposed below one of the step floors 41, 42.
[0020]
Since the step floors 41 and 42 are located substantially at the center of the front and rear of the vehicle body, by arranging the muffler 21 below the step floor 41, the muffler 21 can be disposed substantially at the center of the vehicle body in the front-rear direction. The weight balance before and after can be improved.
[0021]
Therefore, an unnecessary moment is less likely to be generated in the vehicle body, and the motorcycle 10 during traveling can be more easily controlled. Furthermore, when the muffler is arranged behind the vehicle body as in the conventional case, there are design restrictions such as placing a heavy object in front of the vehicle body so that the center of gravity of the vehicle body located on the rear side is located at the center of the vehicle body. This is no longer the present invention, and the degree of freedom in designing the vehicle body can be increased.
[0022]
Second, the present invention provides a belt-type continuously variable transmission 51 that is connected to the output shaft of the engine 16 when the muffler 21 is disposed below one of the step floors 41 as described with reference to FIGS. The belt-type continuously variable transmission 51 is disposed on the other side of the engine 16 when the muffler 21 is disposed on one side of the engine 16 when disposed below the other step floor. I do.
The belt-type continuously variable transmission 51 and the muffler 21 can be arranged separately on the left and right sides of the vehicle body, and the weight balance on the left and right sides of the vehicle body can be improved.
[0023]
Third, the present invention is characterized in that, as described with reference to FIGS. 1 and 4, the side of the muffler 21 is covered with a lower cover 61 extending downward from the edge of the side of the step floor 41.
[0024]
Since the side of the muffler 21 is covered with the lower cover 61, the muffler 21 is not exposed to the outside, and a large muffler that greatly affects the appearance as in the related art is exposed to the outside. Compared to the increase in cost, in the present invention, it is not necessary to improve the appearance of the muffler 21 and the cost of the muffler 21 can be reduced. Therefore, the cost of the motorcycle 10 can be reduced.
[0025]
In the embodiment of the present invention, as shown in FIG. 4, the muffler 21 is arranged only below one of the step floors 41. However, the present invention is not limited to this. A muffler may be arranged below the. As a result, the capacity of the muffler can be increased, and desired silencing performance can be easily obtained.
[0026]
【The invention's effect】
The present invention has the following effects by the above configuration.
In the exhaust system for a motorcycle according to the first aspect, the muffler connected to the engine via the exhaust pipe is disposed below one of the step floors, so that the muffler can be disposed substantially at the center in the vehicle longitudinal direction. Thus, the weight balance before and after the vehicle body can be improved.
[0027]
Therefore, when the muffler is arranged behind the vehicle body as in the conventional case, there are design restrictions such as placing a heavy object in front of the vehicle body so that the center of gravity of the vehicle body located on the rear side is located at the center of the vehicle body. This is no longer the present invention, and the degree of freedom in designing the vehicle body can be increased.
[0028]
In the exhaust device for a motorcycle according to claim 2, when the muffler is arranged below one step floor, the belt-type continuously variable transmission connected to the output shaft of the engine is arranged below the other step floor. The belt-type transmission and the muffler can be arranged separately on the left and right sides of the vehicle body, so that the right and left weight balance of the vehicle body can be improved.
[0029]
In the exhaust device for a motorcycle according to the third aspect, since the side of the muffler is covered with the lower cover extending downward from the edge of the side of the step floor, the muffler is not exposed to the outside, so that the appearance of the muffler is improved. This eliminates the necessity, so that the cost of the muffler can be reduced, and the cost of the motorcycle can be reduced.
[0030]
In the exhaust system for a motorcycle according to claim 4, a power unit including an engine and a belt-type continuously variable transmission connected to an output shaft of the engine is attached to a lower portion of a body frame, and a driver is provided between a steering wheel and a seat. The muffler connected to the engine via the exhaust pipe is located below the step floor, so the muffler can be placed almost at the center of the vehicle in the front-rear direction. Weight balance can be improved.
[0031]
Therefore, when the muffler is arranged behind the vehicle body as in the conventional case, there are design restrictions such as placing a heavy object in front of the vehicle body so that the center of gravity of the vehicle body located on the rear side is located at the center of the vehicle body. This is no longer the present invention, and the degree of freedom in designing the vehicle body can be increased.
[0032]
In the exhaust system for a motorcycle according to claim 5, the muffler is arranged on one side of the engine, and the belt-type continuously variable transmission is arranged on the other side of the engine. Can be arranged separately on the left and right sides of the vehicle body, and the weight balance on the left and right sides of the vehicle body can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle provided with an exhaust device according to the present invention. FIG. 2 is a plan view of a motorcycle according to the present invention. FIG. 3 is a perspective view showing an exhaust device and a power unit according to the present invention. FIG. 5 is a cross-sectional view of the step floor of the motorcycle according to the present invention. FIG. 5 is a side view showing a conventional motorcycle exhaust device.
DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 15 ... Handle, 16 ... Engine, 21 ... Muffler, 35 ... Seat (driver's seat), 41, 42 ... Step floor, 51 ... Belt-type continuously variable transmission, 53 ... Exhaust pipe, 58 ... Swelling part, 61 ... lower cover.

Claims (3)

ハンドルとシートとの間に運転者が足を載せる一対のステップフロアを配置し、これらのステップフロアを上方へ膨出させた膨出部で繋ぎ、この膨出部内にエンジンの一部を配置した自動二輪車において、
前記エンジンに排気管を介して接続したマフラを、前記ステップフロアのうちの一方の下方に配置したことを特徴とする自動二輪車の排気装置。A pair of step floors on which the driver places his / her feet are arranged between the steering wheel and the seat, and these step floors are connected by a bulging portion that bulges upward, and a part of the engine is disposed in the bulging portion. In motorcycles,
A muffler connected to the engine via an exhaust pipe is disposed below one of the step floors. 前記マフラを一方のステップフロアの下方に配置したときに、エンジンの出力軸に連結するベルト式無段変速機を他方のステップフロアの下方に配置したことを特徴とする請求項１記載の自動二輪車の排気装置。The motorcycle according to claim 1, wherein when the muffler is arranged below one step floor, a belt-type continuously variable transmission connected to an output shaft of an engine is arranged below the other step floor. Exhaust system. 前記マフラの側方を、前記ステップフロア側部の縁から下方に延ばしたロアカバーで覆ったことを特徴とする請求項１又は請求項２記載の自動二輪車の排気装置。The exhaust device for a motorcycle according to claim 1 or 2, wherein a side of the muffler is covered with a lower cover extending downward from an edge of a side portion of the step floor.
JP2002185007A 2002-06-25 2002-06-25 Motorcycle exhaust system Expired - Fee Related JP3699423B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2002185007A JP3699423B2 (en) 2002-06-25 2002-06-25 Motorcycle exhaust system
CNB031380379A CN100344474C (en) 2002-06-25 2003-05-30 Exhauster for mopeds

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002185007A JP3699423B2 (en) 2002-06-25 2002-06-25 Motorcycle exhaust system

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007083856A (en) * 2005-09-21 2007-04-05 Honda Motor Co Ltd Low floor type motorcycle
DE102006044875B4 (en) * 2005-09-30 2012-12-20 Honda Motor Co., Ltd. Exhaust system for a motorcycle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4478096B2 (en) * 2005-10-31 2010-06-09 本田技研工業株式会社 Motorcycle exhaust system

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JPH11255169A (en) * 1998-03-10 1999-09-21 Yamaha Motor Co Ltd Cooling structure for scooter
JP4043099B2 (en) * 1998-04-23 2008-02-06 ヤマハ発動機株式会社 Motorcycle rear wheel support structure
JP3839210B2 (en) * 2000-02-02 2006-11-01 本田技研工業株式会社 Cooling water piping arrangement structure for scooter type vehicles
JP4280401B2 (en) * 2000-07-19 2009-06-17 本田技研工業株式会社 Engine exhaust system support structure for motorcycles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007083856A (en) * 2005-09-21 2007-04-05 Honda Motor Co Ltd Low floor type motorcycle
JP4499640B2 (en) * 2005-09-21 2010-07-07 本田技研工業株式会社 Low floor type motorcycle
DE102006044875B4 (en) * 2005-09-30 2012-12-20 Honda Motor Co., Ltd. Exhaust system for a motorcycle

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