JP2012077698A - Exhaust apparatus for motorcycle - Google Patents

Exhaust apparatus for motorcycle Download PDF

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JP2012077698A
JP2012077698A JP2010224780A JP2010224780A JP2012077698A JP 2012077698 A JP2012077698 A JP 2012077698A JP 2010224780 A JP2010224780 A JP 2010224780A JP 2010224780 A JP2010224780 A JP 2010224780A JP 2012077698 A JP2012077698 A JP 2012077698A
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exhaust
pipe
communication pipe
sensor
communication
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JP5650484B2 (en
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Tetsumichi Yamamoto
哲路 山本
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Kawasaki Heavy Industries Ltd
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Kawasaki Heavy Industries Ltd
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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
    • F01N13/00—Exhaust 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
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • 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
    • 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
    • F01N2470/14—Plurality of outlet tubes, e.g. in parallel or with different length
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust apparatus for a motorcycle which can reduce the number of components, effectively protecting an exhaust sensor from external force, and keeping beauty in terms of the external appearance thereof.SOLUTION: In this exhaust apparatus in which an exhaust muffler is connected to respective exhaust downstream ends of a left exhaust pipe and a right exhaust pipe connected to exhaust ports of an engine, an exhaust communication pipe for making the left exhaust pipe communicate with the right exhaust pipe is connected at an exhaust communication part located in the vicinity of an exhaust downstream end and positioned on the exhaust upstream side relative to the exhaust downstream end; and an exhaust sensor for detecting the oxygen concentration in exhaust gas is disposed on the exhaust communication pipe.

Description

本発明は、排気ガス中の酸素濃度を検出するための排気センサを備える、自動二輪車の排気装置に関する。   The present invention relates to an exhaust device for a motorcycle including an exhaust sensor for detecting an oxygen concentration in exhaust gas.

例えば、多気筒のエンジンを搭載した自動二輪車の排気装置として、各気筒に接続された二本の排気管と、該排気管のそれぞれに接続された排気マフラと、二本の排気管を互いに連通する排気連通管と、を備えるものが知られている（例えば、特許文献１を参照）。当該排気連通管は、各気筒内の爆発の時期が互いに異なるために、各気筒からの排気を二つの排気系統に分けることによって背圧を低減させ且つ出力を向上させるために、設けられている。   For example, as an exhaust device for a motorcycle equipped with a multi-cylinder engine, two exhaust pipes connected to each cylinder, an exhaust muffler connected to each of the exhaust pipes, and the two exhaust pipes communicate with each other. An exhaust communication pipe is known (see, for example, Patent Document 1). The exhaust communication pipe is provided to reduce the back pressure and improve the output by dividing the exhaust from each cylinder into two exhaust systems because the timing of the explosion in each cylinder is different from each other. .

特許文献１に開示された排気装置では、二本の排気管が上部排気管及び下部排気管であって、両者が排気連通管を介して連通しており、上部排気管及び下部排気管における排気連通管下流側位置のそれぞれに、排気センサが配置されている。   In the exhaust device disclosed in Patent Document 1, the two exhaust pipes are an upper exhaust pipe and a lower exhaust pipe, and both communicate with each other via an exhaust communication pipe, and exhaust in the upper exhaust pipe and the lower exhaust pipe. An exhaust sensor is disposed at each downstream side position of the communication pipe.

特開２００６−１１２２３９号公報JP 2006-112239 A

上部排気管及び下部排気管のそれぞれに排気センサを配置することは、各気筒に適正な燃料供給制御を行う上で好ましいことであるが、配置される排気センサの個数が増える分だけコストが上昇してしまう。   Although it is preferable to provide an exhaust sensor in each of the upper exhaust pipe and the lower exhaust pipe in order to perform proper fuel supply control for each cylinder, the cost increases as the number of exhaust sensors arranged increases. Resulting in.

また、排気センサが上部排気管及び下部排気管の上面や側面に配置されるために、排気センサに外力が加わる恐れがあることや、排気センサが外部から見えてしまって外観上好ましくないという問題がある。   In addition, since the exhaust sensors are arranged on the upper and side surfaces of the upper exhaust pipe and the lower exhaust pipe, there is a possibility that an external force may be applied to the exhaust sensor, and the exhaust sensor is visible from the outside, which is not preferable in appearance. There is.

したがって、本発明の解決すべき技術的課題は、部品点数を低減することができ、排気センサを外力から効果的に保護することができ、外観上の美観が保たれる、自動二輪車の排気装置を提供することである。   Therefore, the technical problem to be solved by the present invention is to reduce the number of parts, to effectively protect the exhaust sensor from external force, and to maintain the external appearance of the motorcycle. Is to provide.

上記技術的課題を解決するために、本発明によれば、以下の自動二輪車の排気装置が提供される。   In order to solve the above technical problem, according to the present invention, the following motorcycle exhaust device is provided.

すなわち、本発明の請求項１に係る自動二輪車の排気装置は、
エンジンの排気口に接続された左側排気管及び右側排気管の排気下流端のそれぞれに対して、排気マフラを接続した自動二輪車の排気装置であって、
前記左側排気管と右側排気管とを連通する排気連通管が、前記排気下流端の近傍であり且つ前記排気下流端よりも排気上流側に位置する排気連通部において接続されており、
排気ガス中の酸素濃度を検出するための排気センサが、前記排気連通管に配設されていることを特徴とする。 That is, an exhaust device for a motorcycle according to claim 1 of the present invention is:
An exhaust system for a motorcycle in which an exhaust muffler is connected to each of an exhaust downstream end of a left exhaust pipe and a right exhaust pipe connected to an exhaust port of an engine,
An exhaust communication pipe that connects the left exhaust pipe and the right exhaust pipe is connected in an exhaust communication portion that is near the exhaust downstream end and located on the exhaust upstream side of the exhaust downstream end,
An exhaust sensor for detecting an oxygen concentration in the exhaust gas is provided in the exhaust communication pipe.

本発明の請求項２に係る自動二輪車の排気装置では、
前記排気センサが、車長方向の前方且つ斜め上方に延在するように配設されていることを特徴とする。 In the exhaust system for a motorcycle according to claim 2 of the present invention,
The exhaust sensor is arranged to extend forward and obliquely upward in the vehicle length direction.

本発明の請求項３に係る自動二輪車の排気装置では、
前記排気連通管は、大略一様な排気流通断面積を有するように構成されていることを特徴とする。 In the exhaust device for a motorcycle according to claim 3 of the present invention,
The exhaust communication pipe is configured to have a substantially uniform exhaust flow cross-sectional area.

本発明の請求項４に係る自動二輪車の排気装置では、
前記排気センサが配設されている前記排気連通管のセンサ取付部の排気流通断面の縁部は、前記排気センサを取り付けるための平坦部と、前記排気連通管の管壁によって前記縁部の主たる部分を形成する円弧部と、前記平坦部と前記円弧部とをつなぐとともに前記円弧部よりも外方に突出した張出部と、から構成されていることを特徴とする。 In the exhaust device for a motorcycle according to claim 4 of the present invention,
The edge portion of the exhaust flow cross section of the sensor mounting portion of the exhaust communication pipe where the exhaust sensor is disposed is the main portion of the edge portion by a flat portion for mounting the exhaust sensor and a tube wall of the exhaust communication pipe. An arc portion that forms a portion, and an overhanging portion that connects the flat portion and the arc portion and protrudes outward from the arc portion, are characterized by the above.

本発明の請求項５に係る自動二輪車の排気装置では、
前記排気連通部は、排気下流側の一部分が略三日月形状に延在する管壁を有する大略円形の排気流通孔を有することを特徴とする。 In the exhaust device for a motorcycle according to claim 5 of the present invention,
The exhaust communication portion has a substantially circular exhaust circulation hole having a pipe wall extending in a substantially crescent shape at a portion on the exhaust downstream side.

本発明の請求項６に係る自動二輪車の排気装置では、
前記排気連通管は、前記左側排気管に接続される左側連通管と、前記右側排気管に接続される右側連通管と、前記左側連通管及び右側連通管を連結する連結アダプタと、によって構成され、
前記排気センサが、前記連結アダプタに配設されていることを特徴とする。 In the exhaust device for a motorcycle according to claim 6 of the present invention,
The exhaust communication pipe includes a left communication pipe connected to the left exhaust pipe, a right communication pipe connected to the right exhaust pipe, and a connection adapter that connects the left communication pipe and the right communication pipe. ,
The exhaust sensor is disposed in the connection adapter.

請求項１に係る本発明では、排気連通管に配設された排気センサによって、左側排気管及び右側排気管の両方から排出される排気ガス中の酸素濃度を検出することができるので、部品点数を削減することができ、コストを低減することができるという効果を奏する。さらに、排気センサが左側排気管と右側排気管との間にすなわち車幅方向の大略中心部分に配設されることにより、排気センサを外力から効果的に保護することができ、外観上の美観が保たれるという効果を奏する。   In the present invention according to claim 1, since the exhaust sensor disposed in the exhaust communication pipe can detect the oxygen concentration in the exhaust gas discharged from both the left exhaust pipe and the right exhaust pipe, As a result, the cost can be reduced. Further, the exhaust sensor is disposed between the left exhaust pipe and the right exhaust pipe, that is, approximately at the center in the vehicle width direction, so that the exhaust sensor can be effectively protected from external force, and the appearance is beautiful. Has the effect of being maintained.

請求項２に係る本発明では、排気センサへの水の侵入を抑制することができ、排気センサをＥＣＵに接続するためのハーネスの配線長を短くすることができるという効果を奏する。   According to the second aspect of the present invention, water can be prevented from entering the exhaust sensor, and the wiring length of the harness for connecting the exhaust sensor to the ECU can be shortened.

請求項３に係る本発明では、背圧の上昇を抑制して、エンジン出力の低下を招かないという効果を奏する。   The present invention according to claim 3 has an effect of suppressing an increase in back pressure and not causing a decrease in engine output.

請求項４に係る本発明では、排気連通管のセンサ取付部での排気流通断面積を他の部分のそれと大略同じにして、背圧の上昇を抑制して、エンジン出力の低下を招かないという効果を奏する。   According to the fourth aspect of the present invention, the exhaust flow cross-sectional area at the sensor mounting portion of the exhaust communication pipe is made substantially the same as that of the other portions, so that the increase in back pressure is suppressed and the engine output is not reduced. There is an effect.

請求項５に係る本発明では、排気連通管を接続カバーに近づけつつ、接続カバーの排気管への全周溶接を可能にする。その結果、排気センサと排気マフラ内の触媒との間の距離を短くすることができので、燃料供給制御をより適正に行うことができるという効果を奏する。   In the present invention according to claim 5, it is possible to weld the entire circumference of the connection cover to the exhaust pipe while bringing the exhaust communication pipe close to the connection cover. As a result, since the distance between the exhaust sensor and the catalyst in the exhaust muffler can be shortened, there is an effect that the fuel supply control can be performed more appropriately.

請求項６に係る本発明では、排気装置における排気連通管の位置決め調整が容易であるという効果を奏する。   In the present invention according to claim 6, there is an effect that the positioning adjustment of the exhaust communication pipe in the exhaust device is easy.

本発明を適用した自動二輪車の左側面図である。1 is a left side view of a motorcycle to which the present invention is applied. 図１における自動二輪車の排気装置の一部分を車体の右側後方から見た斜視図である。FIG. 2 is a perspective view of a part of the motorcycle exhaust device in FIG. 1 as viewed from the rear right side of the vehicle body. 図１における自動二輪車の排気装置を車体の左側前方から見た斜視図である。FIG. 2 is a perspective view of the motorcycle exhaust device in FIG. 1 as viewed from the front left side of the vehicle body. 図１における自動二輪車の排気装置の平面図である。Fig. 2 is a plan view of the exhaust device for the motorcycle in Fig. 1. 図１における自動二輪車の左側排気管及び排気連通管の一部分を車体の前方から見た正面図である。FIG. 2 is a front view of a part of a left exhaust pipe and an exhaust communication pipe of the motorcycle shown in FIG. 1 as viewed from the front of the vehicle body. 図１における自動二輪車の右側排気管及び排気連通管の他の部分を車体の左側面から見た図である。FIG. 2 is a view of the other part of the right exhaust pipe and the exhaust communication pipe of the motorcycle in FIG. 1 as viewed from the left side of the vehicle body. 排気連通管を接続する前の左側排気管を左側面から見た断面図である。It is sectional drawing which looked at the left exhaust pipe before connecting an exhaust communication pipe from the left side. 図５における排気ガスセンサ取付部のＶＩＩＩ−ＶＩＩＩ線断面図である。FIG. 6 is a cross-sectional view of the exhaust gas sensor mounting portion in FIG. 5 taken along line VIII-VIII.

以下に、本発明の好ましい実施形態に係る自動二輪車１の排気装置８について、図面を参照しながら説明する。なお、本願において、「右」とは車体をその前方に見たときの向かって右側を言い、「左」とは車体をその前方に見たときの向かって左側を言う。   Hereinafter, an exhaust device 8 of a motorcycle 1 according to a preferred embodiment of the present invention will be described with reference to the drawings. In the present application, “right” refers to the right side when the vehicle body is viewed in front thereof, and “left” refers to the left side when the vehicle body is viewed in front thereof.

（自動二輪車の構成）
図１は、本発明を適用した自動二輪車１の左側面図である。また、図２は、図１における自動二輪車１の排気装置８の一部分を車体の右側後方から見た斜視図である。図１において、車体フレーム２は、側方から見て概ね平行四辺形に形成されると共に、後方に延びる後部フレームを一体に備えている。車体フレーム２の前上端部に形成されたヘッドパイプ３にはフロントフォーク５が支持され、フロントフォーク５の上端部にはハンドル６が設けられ、フロントフォーク５の下端部には前車輪７が支持されている。 (Configuration of motorcycle)
FIG. 1 is a left side view of a motorcycle 1 to which the present invention is applied. FIG. 2 is a perspective view of a part of the exhaust device 8 of the motorcycle 1 in FIG. 1 as viewed from the rear right side of the vehicle body. In FIG. 1, the vehicle body frame 2 is formed in a substantially parallelogram when viewed from the side, and is integrally provided with a rear frame extending rearward. A front fork 5 is supported on the head pipe 3 formed at the front upper end of the body frame 2, a handle 6 is provided at the upper end of the front fork 5, and a front wheel 7 is supported at the lower end of the front fork 5. Has been.

車体フレーム２の後下端部には、アーム支持軸を介してスイングアーム１０の前端部が上下方向揺動可能に支持され、該スイングアーム１０の後端部に後車輪１１が支持されている。スイングアーム１０の前寄り部分と車体フレーム２の後上端部との間にはリヤサスペンション１３が弾性伸縮可能に介装され、スイングアーム１０を弾性支持している。   A front end portion of the swing arm 10 is supported on the rear lower end portion of the body frame 2 via an arm support shaft so as to be swingable in the vertical direction, and a rear wheel 11 is supported on the rear end portion of the swing arm 10. A rear suspension 13 is interposed between a front portion of the swing arm 10 and a rear upper end portion of the vehicle body frame 2 so as to be elastically extendable, and elastically supports the swing arm 10.

車体フレーム２の上には、前から順にたとえば燃料タンク１５、シート１６及びリヤシート等が取り付けられており、シート１６及びリヤシートの下側には各種電装部品等が配置され、車体フレーム２内にエンジン（例えば、並列二気筒エンジン）１８が搭載されている。   On the body frame 2, for example, a fuel tank 15, a seat 16, a rear seat, and the like are attached in order from the front, and various electrical components and the like are disposed below the seat 16 and the rear seat, and the engine is placed in the body frame 2. (For example, a parallel two-cylinder engine) 18 is mounted.

（排気装置の構成）
図３は、図１における自動二輪車１の排気装置８を車体の左側前方から見た斜視図である。図４は、図１における自動二輪車１の排気装置８の平面図である。左側排気管２０及び右側排気管２１は、シリンダヘッドの前面排気接続口にそれぞれ接続されている。例えば、左側排気管２０は第一気筒に、右側排気管２１は第二気筒に連通している。左側排気管２０及び右側排気管２１は、それぞれ、シリンダヘッドから下方へ湾曲状に曲がると共に、エンジン１８のクランクケース１９の下側を後方へ延び、スイングアーム１０の前部の近傍を通って、後方へ延びている。 (Exhaust system configuration)
FIG. 3 is a perspective view of the exhaust device 8 of the motorcycle 1 in FIG. 1 as viewed from the front left side of the vehicle body. FIG. 4 is a plan view of the exhaust device 8 of the motorcycle 1 in FIG. The left exhaust pipe 20 and the right exhaust pipe 21 are connected to the front exhaust connection port of the cylinder head, respectively. For example, the left exhaust pipe 20 communicates with the first cylinder, and the right exhaust pipe 21 communicates with the second cylinder. Each of the left exhaust pipe 20 and the right exhaust pipe 21 bends downward in a curved shape from the cylinder head, extends rearward from the lower side of the crankcase 19 of the engine 18, passes through the vicinity of the front portion of the swing arm 10, It extends backward.

左側排気管２０及び右側排気管２１の各後端には、車長方向の後方へ延びる左側排気マフラ２２及び右側排気マフラ２３がそれぞれ接続されている。左側排気マフラ２２及び右側排気マフラ２３の各後端には、テール管２８，２９が設けられている。左側排気マフラ２２及び右側排気マフラ２３には、それぞれ車体フレーム１の後部フレームに取り付けるための取付ブラケット２６，２７が形成されている。また、左側排気マフラ２２及び右側排気マフラ２３には、該排気マフラ２２，２３を外傷から保護するための保護部材２４，２５が取り付けられている。   A left exhaust muffler 22 and a right exhaust muffler 23 that extend rearward in the vehicle length direction are connected to the rear ends of the left exhaust pipe 20 and the right exhaust pipe 21, respectively. Tail tubes 28 and 29 are provided at the rear ends of the left exhaust muffler 22 and the right exhaust muffler 23. The left exhaust muffler 22 and the right exhaust muffler 23 are formed with mounting brackets 26 and 27 for attaching to the rear frame of the vehicle body frame 1, respectively. The left exhaust muffler 22 and the right exhaust muffler 23 are provided with protective members 24 and 25 for protecting the exhaust mufflers 22 and 23 from damage.

左側排気管２０及び右側排気管２１は、排気連通管３０によって接続され且つ内部が連通されている。排気連通管３０は、左側排気管２０及び右側排気管２１の各排気下流端の近傍であり且つ排気下流端よりも排気上流側に位置する排気連通部において、それぞれ、溶接によって接続されている。左側排気管２０及び右側排気管２１と排気連通管３０との接続構造は、以下に詳述する。   The left exhaust pipe 20 and the right exhaust pipe 21 are connected by an exhaust communication pipe 30 and communicated with each other inside. The exhaust communication pipes 30 are connected by welding at the exhaust communication parts located near the exhaust downstream ends of the left exhaust pipe 20 and the right exhaust pipe 21 and located on the exhaust upstream side of the exhaust downstream end. The connection structure of the left exhaust pipe 20 and the right exhaust pipe 21 and the exhaust communication pipe 30 will be described in detail below.

排気連通管３０は、左側排気管２０に接続される左側連通管３２と、右側排気管２１に接続される右側連通管３３と、左側連通管３２及び右側連通管３３を連結する連結アダプタ３４と、によって構成されている。連結アダプタ３４の左側接続部５２に左側連通管３２を嵌合させた状態で全周溶接することにより、左側連通管３２と連結アダプタ３４とを接続している。連結アダプタ３４の階段状の右側接続部５４にガスケットを介して右側連通管３３を嵌合させた状態でクランプバンドで締め付けることにより、右側連通管３３と連結アダプタ３４とを着脱可能に接続している。なお、左側連通管３２と右側連通管３３と連結アダプタ３４との間での接続方法や接続方向は、上記の態様に限定されず、既存の態様を適宜に適用することができる。   The exhaust communication pipe 30 includes a left communication pipe 32 connected to the left exhaust pipe 20, a right communication pipe 33 connected to the right exhaust pipe 21, and a connection adapter 34 that connects the left communication pipe 32 and the right communication pipe 33. , Is composed of. The left communication pipe 32 and the connection adapter 34 are connected by welding the entire circumference with the left communication pipe 32 fitted to the left connection portion 52 of the connection adapter 34. The right communication tube 33 and the connection adapter 34 are detachably connected by tightening with a clamp band in a state where the right communication tube 33 is fitted to the stepped right connection portion 54 of the connection adapter 34 via a gasket. Yes. In addition, the connection method and connection direction between the left side communication pipe 32, the right side communication pipe 33, and the connection adapter 34 are not limited to said aspect, The existing aspect can be applied suitably.

左側排気管２０及び右側排気管２１は、それぞれ、車幅方向の内側側面であって少し下方位置において、斜め下方に向けて開口する排気流通孔６０を有している。図７に示すように、各排気流通孔６０は、完全な円形ではなく、例えば、排気下流側の後端部分には三日月状の管壁部分６１を備えている。図７に示すように、三日月状の管壁部分６１は、排気連通管３０をお椀状の接続カバー７２，７３にできるだけ接近させた状態で左右の排気管２０，２１とお椀状の接続カバー７２，７３との間での全周溶接を可能にするために設けられている。当該構成によれば、排気連通管３０が排気マフラ２２，２３内の触媒に近づいて排気センサ４０と触媒との間の距離を短くすることができので、燃料供給制御をより適正に行うことができる。なお、接続カバー７２，７３の形状は、お椀形状に限定されず、大略円錐形状等にもすることができる。   Each of the left exhaust pipe 20 and the right exhaust pipe 21 has an exhaust circulation hole 60 that opens obliquely downward at a slightly lower position on the inner side surface in the vehicle width direction. As shown in FIG. 7, each exhaust circulation hole 60 is not completely circular, and includes, for example, a crescent-shaped tube wall portion 61 at the rear end portion on the exhaust downstream side. As shown in FIG. 7, the crescent-shaped tube wall portion 61 includes the left and right exhaust pipes 20, 21 and the bowl-shaped connection cover 72 with the exhaust communication pipe 30 as close as possible to the bowl-shaped connection covers 72, 73. , 73 in order to enable all-around welding. According to this configuration, the exhaust communication pipe 30 approaches the catalyst in the exhaust mufflers 22 and 23 and the distance between the exhaust sensor 40 and the catalyst can be shortened, so that the fuel supply control can be performed more appropriately. it can. In addition, the shape of the connection covers 72 and 73 is not limited to the bowl shape, but may be a generally conical shape.

左側排気管２０に形成された排気流通孔６０の孔径よりも大きな口径を有する左側連結継手７４が左側排気管２０に全周溶接で接続されていて、左側連結継手７４が車幅方向の中心部分に向けて斜め下方に延びている。同様に、右側排気管２１に形成された排気流通孔６０の孔径よりも大きな口径を有する右側連結継手７５が右側排気管２１に全周溶接で接続されていて、右側連結継手７５が車幅方向の中心部分に向けて斜め下方に延びている。左側連結継手７４の中心側端部は、左側連通管３２に全周溶接で接続されている。右側連結継手７５の中心側端部は、右側連通管３３に全周溶接で接続されている。図５に示すように、左側連結継手７４が少し湾曲しているとともに連結アダプタ３４が直管状に延びている。また、少し湾曲している右側連結継手７５が連結アダプタ３４に接続されている。したがって、排気連通管３０は、全体として、中央部が少し下方に位置する略Ｕ字形状をしている。   A left connecting joint 74 having a diameter larger than the diameter of the exhaust circulation hole 60 formed in the left exhaust pipe 20 is connected to the left exhaust pipe 20 by all-around welding, and the left connecting joint 74 is a central portion in the vehicle width direction. It extends diagonally downward toward. Similarly, a right connecting joint 75 having a diameter larger than the diameter of the exhaust circulation hole 60 formed in the right exhaust pipe 21 is connected to the right exhaust pipe 21 by welding all around, and the right connecting joint 75 is connected in the vehicle width direction. It extends obliquely downward toward the central portion of the. The center side end portion of the left connecting joint 74 is connected to the left communication pipe 32 by all-around welding. The center side end of the right connection joint 75 is connected to the right communication pipe 33 by welding all around. As shown in FIG. 5, the left connection joint 74 is slightly curved and the connection adapter 34 extends in a straight tube shape. Further, a right-hand coupling joint 75 that is slightly curved is connected to the coupling adapter 34. Therefore, the exhaust communication pipe 30 as a whole has a substantially U shape with the central portion positioned slightly below.

また、左側連結継手７４及び右側連結継手７５のそれぞれの外側部分が、左側保護カバー３８及び右側保護カバー３９で覆われている。当該構成によれば、排気連通管３０の接続されたあたりの排気管２０，２１が、熱によって変色（焼け）することを外観上見せなくすることができる。左側の方が排気管２０，２１の露出部分が多いとき、左側保護カバー３８を右側保護カバー３９よりも車長方向に長く延在するように構成することができる。   Further, the outer portions of the left connecting joint 74 and the right connecting joint 75 are covered with the left protective cover 38 and the right protective cover 39, respectively. According to this configuration, it is possible to prevent the exhaust pipes 20 and 21 around which the exhaust communication pipe 30 is connected from being discolored (burned) by heat. When the left side has more exposed portions of the exhaust pipes 20, 21, the left protective cover 38 can be configured to extend longer in the vehicle length direction than the right protective cover 39.

排気連通管３０を略Ｕ字形状にすることにより、左側排気管２０及び右側排気管２１を上方に配置することができる。そして、図５に示すように、左側排気マフラ２２の軸心Ｂは、左側排気管２０の軸心Ａに対して、車高方向の上方であって且つ車幅方向の外方に偏心した位置にある。同様に、右側排気マフラ２３の軸心も、右側排気管２１の軸心に対して、車高方向の上方であって且つ車幅方向の外方に偏心した位置にある。左側排気マフラ２２及び右側排気マフラ２３を上方に配置することにより、バンク角を確保することができる。また、左側排気マフラ２２及び右側排気マフラ２３を車幅方向の外方に配置することにより、スイングアーム１０との干渉を避けることができる。   By making the exhaust communication pipe 30 substantially U-shaped, the left exhaust pipe 20 and the right exhaust pipe 21 can be disposed above. As shown in FIG. 5, the axis B of the left exhaust muffler 22 is located above the axis A of the left exhaust pipe 20 in the vehicle height direction and eccentrically outward in the vehicle width direction. It is in. Similarly, the axial center of the right exhaust muffler 23 is also located above the axial center of the right exhaust pipe 21 in the position higher in the vehicle height direction and outward in the vehicle width direction. By arranging the left exhaust muffler 22 and the right exhaust muffler 23 upward, a bank angle can be secured. Further, by arranging the left exhaust muffler 22 and the right exhaust muffler 23 outward in the vehicle width direction, interference with the swing arm 10 can be avoided.

排気センサ４０を取り付けるための取付部が排気連通管３０に形成されている。例えば、当該取付部は連結アダプタ３４に形成されてもよく、連結アダプタ３４の車長方向の前方且つ斜め上方の周面には、排気センサ４０を取り付けるための内ネジ式のセンサ取付ソケット５０が設けられており、排気センサ４０はセンサ取付ソケット５０に螺着される。図８に示すように、排気センサ４０が配設されるセンサ取付ソケット５０の排気流通断面の縁部は、排気センサ４０を取り付けるための平坦部８１と、排気連通管３０の管壁によって縁部の主たる部分を形成する円弧部８３と、平坦部８１と円弧部８３とをつなぐとともに円弧部８３よりも少し外方に突出した張出部８２と、から構成されている。すなわち、排気センサ４０を取り付けるための平坦部８１を少し外方に突出させることにより、センサ取付ソケット５０での排気流通断面積が、他の部分の排気流通断面積と大略同じになっている。センサ取付ソケット５０を有する排気連通管３０における排気流通断面積を大略同じにすることにより、背圧の上昇を抑制して、エンジンの出力低下を防止している。   An attachment portion for attaching the exhaust sensor 40 is formed in the exhaust communication pipe 30. For example, the attachment portion may be formed in the connection adapter 34, and an inner screw type sensor attachment socket 50 for attaching the exhaust sensor 40 is provided on the front surface of the connection adapter 34 in the vehicle length direction and obliquely upward. The exhaust sensor 40 is screwed to the sensor mounting socket 50. As shown in FIG. 8, the edge portion of the exhaust flow cross section of the sensor mounting socket 50 in which the exhaust sensor 40 is disposed is an edge portion by the flat portion 81 for attaching the exhaust sensor 40 and the tube wall of the exhaust communication pipe 30. The arc part 83 which forms the main part of this, and the overhang | projection part 82 which protruded a little outward from the circular arc part 83 while connecting the flat part 81 and the circular arc part 83 are comprised. That is, by projecting the flat portion 81 for mounting the exhaust sensor 40 slightly outward, the exhaust flow cross-sectional area at the sensor mounting socket 50 is substantially the same as the exhaust flow cross-sectional area of other portions. By making the exhaust flow cross-sectional area in the exhaust communication pipe 30 having the sensor mounting socket 50 substantially the same, an increase in the back pressure is suppressed and a decrease in the output of the engine is prevented.

以上のように、排気連通管３０の連結アダプタ３４に取り付けられた状態の排気センサ４０は、車幅方向のほぼ中央の位置であって、車長方向の前方且つ斜め上方に延在するように配設されている。左側排気管２０及び右側排気管２１を連通する排気連通管３０に対して一つの排気センサ４０を配設することにより、一つの排気センサ４０で左側排気管２０及び右側排気管２１の両方の排気ガス中の酸素濃度を検出することができる。自動二輪車１を側面から見たときに、排気センサ４０は、左側排気管２０及び右側排気管２１や車体フレーム１の後部フレームに隠れて目立たない。したがって、排気センサ４０が美観を損ねることなく、また、排気センサ４０がライダーの足に当たることもない。   As described above, the exhaust sensor 40 attached to the connection adapter 34 of the exhaust communication pipe 30 is at a substantially central position in the vehicle width direction and extends forward and obliquely upward in the vehicle length direction. It is arranged. By providing one exhaust sensor 40 for the exhaust communication pipe 30 that communicates the left exhaust pipe 20 and the right exhaust pipe 21, the exhaust of both the left exhaust pipe 20 and the right exhaust pipe 21 is achieved by one exhaust sensor 40. The oxygen concentration in the gas can be detected. When the motorcycle 1 is viewed from the side, the exhaust sensor 40 is hidden behind the left exhaust pipe 20 and the right exhaust pipe 21 and the rear frame of the vehicle body frame 1 and is not noticeable. Therefore, the exhaust sensor 40 does not impair the appearance, and the exhaust sensor 40 does not hit the rider's foot.

排気センサ４０は、車長方向の前方であって且つ水平面に対して斜め上方へ傾斜していることが好ましく、その傾斜角度は、例えば約４５度である。排気センサ４０が車長方向の前方且つ斜め上方に向いた状態で排気連通管３０に取り付けられているので、たとえば排気ガス中の蒸気が凝縮して液分が生じたとしても、これが排気センサ４０内に侵入することを防止できる。   The exhaust sensor 40 is preferably in front of the vehicle length direction and inclined obliquely upward with respect to the horizontal plane, and the inclination angle is, for example, about 45 degrees. Since the exhaust sensor 40 is attached to the exhaust communication pipe 30 in a state where the exhaust sensor 40 is directed forward and obliquely upward, even if, for example, the vapor in the exhaust gas is condensed and a liquid component is generated, this is detected. Intrusion can be prevented.

排気連通管３０の連結アダプタ３４に取り付けられた排気センサ４０からのハーネス４２が、車長方向の前方且つ斜め上方に延びていて、ＥＣＵ（電気コントロールユニット）に接続されている。当該構成により、排気センサ４０をＥＣＵに接続するためのハーネス４２の配線長を短くすることができる。   A harness 42 from the exhaust sensor 40 attached to the connection adapter 34 of the exhaust communication pipe 30 extends forward and obliquely upward in the vehicle length direction, and is connected to an ECU (electric control unit). With this configuration, the wiring length of the harness 42 for connecting the exhaust sensor 40 to the ECU can be shortened.

１：自動二輪車
８：排気装置
２０：左側排気管
２１：右側排気管
２２：左側排気マフラ
２３：右側排気マフラ
３０：排気連通管
４０：排気センサ
５０：センサ取付ソケット
６０：排気流通孔 1: Motorcycle 8: Exhaust device 20: Left exhaust pipe 21: Right exhaust pipe 22: Left exhaust muffler 23: Right exhaust muffler 30: Exhaust communication pipe 40: Exhaust sensor 50: Sensor mounting socket 60: Exhaust flow hole

Claims (6)

エンジンの排気口に接続された左側排気管及び右側排気管の排気下流端のそれぞれに対して、排気マフラを接続した自動二輪車の排気装置であって、
前記左側排気管と右側排気管とを連通する排気連通管が、前記排気下流端の近傍であり且つ前記排気下流端よりも排気上流側に位置する排気連通部において接続されており、
排気ガス中の酸素濃度を検出するための排気センサが、前記排気連通管に配設されていることを特徴とする自動二輪車の排気装置。 An exhaust system for a motorcycle in which an exhaust muffler is connected to each of an exhaust downstream end of a left exhaust pipe and a right exhaust pipe connected to an exhaust port of an engine,
An exhaust communication pipe that connects the left exhaust pipe and the right exhaust pipe is connected in an exhaust communication portion that is near the exhaust downstream end and located on the exhaust upstream side of the exhaust downstream end,
An exhaust system for a motorcycle, wherein an exhaust sensor for detecting an oxygen concentration in the exhaust gas is disposed in the exhaust communication pipe. 前記排気センサが、車長方向の前方且つ斜め上方に延在するように配設されていることを特徴とする、請求項１に記載の排気装置。   The exhaust system according to claim 1, wherein the exhaust sensor is disposed so as to extend forward and obliquely upward in the vehicle length direction. 前記排気連通管は、大略一様な排気流通断面積を有するように構成されていることを特徴とする、請求項１又は２に記載の排気装置。   The exhaust system according to claim 1 or 2, wherein the exhaust communication pipe is configured to have a substantially uniform exhaust flow cross-sectional area. 前記排気センサが配設されている前記排気連通管のセンサ取付部の排気流通断面の縁部は、前記排気センサを取り付けるための平坦部と、前記排気連通管の管壁によって前記縁部の主たる部分を形成する円弧部と、前記平坦部と前記円弧部とをつなぐとともに前記円弧部よりも外方に突出した張出部と、から構成されていることを特徴とする、請求項１乃至３のいずれか一つに記載の排気装置。   The edge portion of the exhaust flow cross section of the sensor mounting portion of the exhaust communication pipe where the exhaust sensor is disposed is the main portion of the edge portion by a flat portion for mounting the exhaust sensor and a tube wall of the exhaust communication pipe. 4. An arc portion that forms a portion, and an overhanging portion that connects the flat portion and the arc portion and protrudes outward from the arc portion. The exhaust device according to any one of the above. 前記排気連通部は、排気下流側の一部分が略三日月形状に延在する管壁を有する大略円形の排気流通孔を有することを特徴とする、請求項１乃至４のいずれか一つに記載の排気装置。   5. The exhaust communication portion according to claim 1, wherein the exhaust communication portion has a substantially circular exhaust circulation hole having a tube wall extending in a substantially crescent shape at a portion on the exhaust downstream side. Exhaust system. 前記排気連通管は、前記左側排気管に接続される左側連通管と、前記右側排気管に接続される右側連通管と、前記左側連通管及び右側連通管を連結する連結アダプタと、によって構成され、
前記排気センサが、前記連結アダプタに配設されていることを特徴とする、請求項１乃至５のいずれか一つに記載の排気装置。 The exhaust communication pipe includes a left communication pipe connected to the left exhaust pipe, a right communication pipe connected to the right exhaust pipe, and a connection adapter that connects the left communication pipe and the right communication pipe. ,
The exhaust device according to any one of claims 1 to 5, wherein the exhaust sensor is disposed in the connection adapter.
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