JP2016183657A - Motor cycle - Google Patents

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Publication number
JP2016183657A
JP2016183657A JP2015065326A JP2015065326A JP2016183657A JP 2016183657 A JP2016183657 A JP 2016183657A JP 2015065326 A JP2015065326 A JP 2015065326A JP 2015065326 A JP2015065326 A JP 2015065326A JP 2016183657 A JP2016183657 A JP 2016183657A
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Japan
Prior art keywords
exhaust gas
gas sensor
exhaust pipe
exhaust
silencer
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JP2015065326A
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Japanese (ja)
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JP6454578B2 (en
Inventor
卓祥 庄村
Takaaki Shomura
卓祥 庄村
宏司 中川
Koji Nakagawa
宏司 中川
規文 清水
Norifumi Shimizu
規文 清水
康弘 ▲高▼田
康弘 ▲高▼田
Yasuhiro Takada
慎治 川▲崎▼
Shinji Kawasaki
慎治 川▲崎▼
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP2015065326A priority Critical patent/JP6454578B2/en
Priority to MYPI2017703552A priority patent/MY189076A/en
Priority to PCT/JP2016/059134 priority patent/WO2016152899A1/en
Priority to BR112017020006-6A priority patent/BR112017020006B1/en
Priority to CN201680018133.9A priority patent/CN107429617B/en
Publication of JP2016183657A publication Critical patent/JP2016183657A/en
Priority to PH12017501718A priority patent/PH12017501718B1/en
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Publication of JP6454578B2 publication Critical patent/JP6454578B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00—Motorcycles characterised by position of motor or engine
    • B62M7/02—Motorcycles characterised by position of motor or engine with engine between front and rear wheels
    • 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
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • 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

Abstract

PROBLEM TO BE SOLVED: To provide a technology that inhibits enlargement of a vehicle in a motor cycle including an exhaust gas sensor near a noise eliminator.SOLUTION: A motor cycle 10 includes: a swing arm 16 rotatably supporting a rear wheel; an exhaust pipe 41; a noise eliminator 43 which is disposed at the outer side of the swing arm 16 and connected with the exhaust pipe 41; a catalyst provided in the exhaust pipe 41; and an exhaust gas sensor 67 which detects an exhaust gas component in the exhaust pipe 41. The noise eliminator 43 includes an enlarged diameter part 95 in which a diameter gradually expands. The exhaust gas sensor 67 is attached to the enlarged diameter part 95 and provided between the exhaust pipe 41 and the swing arm 16. A recessed part 121 is provided in the enlarged diameter part 95. The exhaust gas sensor 67 is attached to the recessed part 121.SELECTED DRAWING: Figure 7

Description

本発明は、排気ガスセンサを備えた自動二輪車の改良に関する。   The present invention relates to an improvement in a motorcycle including an exhaust gas sensor.

排気ガス中の排気ガス成分を検出できる排気ガスセンサを備えたエンジンの排気装置が知られている（例えば、特許文献１（図３）参照。）。   An engine exhaust device having an exhaust gas sensor capable of detecting an exhaust gas component in exhaust gas is known (see, for example, Patent Document 1 (FIG. 3)).

特許文献１の図３に示すように、エンジンの排気装置（６）（括弧付き数字は、特許文献１記載の符号を示す。以下同じ。）は、エンジンの排気ポートから延びる排気管（７）と、この排気管（７）の下流端部（７ａ）に接続された消音器（８）とを備えており、下流端部（７ａ）は、消音器（８）内に収容される。排気管（７）内には、三元触媒（１０）（以下、「触媒」と言う。）が配置され、この触媒（１０）の下流側にＯ２センサ（１４）（以下、「排気ガスセンサ（１４）」と言う。）が配置される。 As shown in FIG. 3 of Patent Document 1, an exhaust system (6) for an engine (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter), an exhaust pipe (7) extending from the exhaust port of the engine. And a silencer (8) connected to the downstream end (7a) of the exhaust pipe (7). The downstream end (7a) is accommodated in the silencer (8). A three-way catalyst (10) (hereinafter referred to as “catalyst”) is disposed in the exhaust pipe (7), and an O 2 sensor (14) (hereinafter referred to as “exhaust gas sensor”) is disposed downstream of the catalyst (10). (14) "is arranged.

ところで、消音器（８）は、所定の容量をもつ膨張室を有する。このような消音器（８）内に排気ガスセンサ（１４）を設けると、消音器（８）の外方に張り出すように排気ガスセンサ（１４）が設けられてしまい、車両が大型化する傾向にある。
消音器の近傍に排気ガスセンサを備えた自動二輪車において、車両の大型化を抑えることができる技術が望まれる。 By the way, the silencer (8) has an expansion chamber having a predetermined capacity. If the exhaust gas sensor (14) is provided in such a silencer (8), the exhaust gas sensor (14) is provided so as to project outward from the silencer (8), and the vehicle tends to be enlarged. is there.
In a motorcycle equipped with an exhaust gas sensor in the vicinity of a silencer, a technique that can suppress an increase in the size of the vehicle is desired.

国際公開第ＷＯ２００５／０７５８０５号International Publication No. WO2005 / 075805

本発明は、消音器の近傍に排気ガスセンサを備えた自動二輪車において、車両の大型化を抑えることができる技術を提供することを課題とする。   An object of the present invention is to provide a technology capable of suppressing the increase in size of a vehicle in a motorcycle including an exhaust gas sensor in the vicinity of a silencer.

請求項１に係る発明は、後輪を回転可能に支持するスイングアームと、エンジンと、このエンジンの排気ポートに接続される排気管と、スイングアームの外側に配置されると共に、排気管の後端に接続される消音器と、排気管内に設けられる触媒と、排気管内の排気ガス成分を検出できる排気ガスセンサとを備える自動二輪車であって、触媒は、消音器と排気管の接合部の近傍に設けられ、消音器は、接合部から徐々に拡径された拡径部を備え、排気ガスセンサは、拡径部に取付けられると共に、排気管とスイングアームの間に設けられることを特徴とする。   According to a first aspect of the present invention, a swing arm that rotatably supports a rear wheel, an engine, an exhaust pipe connected to an exhaust port of the engine, an outer side of the swing arm, and a rear of the exhaust pipe A motorcycle comprising a silencer connected to an end, a catalyst provided in an exhaust pipe, and an exhaust gas sensor capable of detecting an exhaust gas component in the exhaust pipe, wherein the catalyst is in the vicinity of a joint between the silencer and the exhaust pipe The silencer includes a diameter-expanded portion that is gradually expanded from the joint portion, and the exhaust gas sensor is attached to the diameter-expanded portion and is provided between the exhaust pipe and the swing arm. .

請求項２に係る発明は、拡径部に、排気管に向かって窪む凹部が設けられ、この凹部に排気ガスセンサが取付けられることを特徴とする。   The invention according to claim 2 is characterized in that a recessed portion that is recessed toward the exhaust pipe is provided in the enlarged diameter portion, and an exhaust gas sensor is attached to the recessed portion.

請求項３に係る発明は、凹部に対応する位置で、排気管の中心は、拡径部の中心から凹部に寄った位置に設けられることを特徴とする。   The invention according to claim 3 is characterized in that the center of the exhaust pipe is provided at a position corresponding to the concave portion, and at a position near the concave portion from the center of the enlarged diameter portion.

請求項４に係る発明は、車両正面視で、排気ガスセンサは、エンジンのクランクケースと重なる位置に配置されることを特徴とする。   The invention according to claim 4 is characterized in that the exhaust gas sensor is disposed at a position overlapping the crankcase of the engine when viewed from the front of the vehicle.

請求項５に係る発明は、自動二輪車に、更に、同乗者が足を置くピリオンステップが備えられ、このピリオンステップの内側に、排気ガスセンサが配置されることを特徴とする。   The invention according to claim 5 is characterized in that the motorcycle is further provided with a pillion step in which a passenger puts his / her foot, and an exhaust gas sensor is arranged inside the pillion step.

請求項６に係る発明は、消音器は、同乗者ステップに支持されており、排気ガスセンサから配線が延びており、この配線は、ピリオンステップの内側に沿って、車体カバー内に配策されていることを特徴とする。   In the invention according to claim 6, the silencer is supported by the passenger step, and the wiring extends from the exhaust gas sensor, and this wiring is routed in the vehicle body cover along the inside of the pillion step. It is characterized by being.

請求項１に係る発明では、排気ガスセンサは、消音器に備えられている拡径部に取付けられる。拡径部のスペースを利用して排気ガスセンサを取付けることができれば、排気ガスセンサを消音器に取付ける場合に比べて径方向外側に大きく張り出さないように配置できる。従って、消音器の直前（接続部近傍）に触媒が設けられ、その後方に排気ガスセンサが備えられている自動二輪車において、車両の大型化を抑えることができる。また、排気ガスセンサは、排気管とスイングアームの間に挟まれるように配置されるので、車両の外観性が損なわれ難い。   In the invention which concerns on Claim 1, an exhaust-gas sensor is attached to the enlarged diameter part with which the silencer is equipped. If the exhaust gas sensor can be mounted using the space of the enlarged diameter portion, the exhaust gas sensor can be disposed so as not to protrude greatly outward in the radial direction compared to the case where the exhaust gas sensor is mounted on the silencer. Therefore, in a motorcycle in which a catalyst is provided immediately before the silencer (in the vicinity of the connecting portion) and an exhaust gas sensor is provided behind the catalyst, the increase in size of the vehicle can be suppressed. Further, since the exhaust gas sensor is disposed so as to be sandwiched between the exhaust pipe and the swing arm, the appearance of the vehicle is hardly impaired.

請求項２に係る発明では、拡径部に凹部が設けられ、この凹部に排気ガスセンサが取付けられる。排気ガスセンサは、凹部に収容されるので、凹部が形成されない場合に比べ排気ガスセンサの張出量を抑えることができる。また、排気ガスセンサの張出量が減るので、外からの影響を受け難く飛石等から保護することができる。   In the invention which concerns on Claim 2, a recessed part is provided in an enlarged diameter part, and an exhaust-gas sensor is attached to this recessed part. Since the exhaust gas sensor is accommodated in the recess, the amount of overhang of the exhaust gas sensor can be suppressed as compared with the case where the recess is not formed. Further, since the amount of overhang of the exhaust gas sensor is reduced, it can be protected from flying stones and the like without being affected by the outside.

請求項３に係る発明では、排気管の中心は、拡径部の中心から凹部に寄った位置に設けられる。凹部に寄せて排気管を配策したので、凹部が窪む量を小さくできる。窪み量が小さい凹部になれば、加工費を抑制できる。   In the invention which concerns on Claim 3, the center of an exhaust pipe is provided in the position which approached the recessed part from the center of the enlarged diameter part. Since the exhaust pipe is routed to the recess, the amount of recess recess can be reduced. If it becomes a recessed part with a small amount of dents, processing cost can be suppressed.

請求項４に係る発明では、車両正面視で、排気ガスセンサは、エンジンのクランクケースと重なる位置に配置される。走行中に、前方から飛散する飛び石等はクランクケースに当たり、このクランクケースの後方に配置した排気ガスセンサには当り難い。結果、前方からの飛び石等から排気ガスセンサを保護できる。   In the invention which concerns on Claim 4, an exhaust-gas sensor is arrange | positioned in the position which overlaps with the crankcase of an engine by vehicle front view. While traveling, stepping stones scattered from the front hit the crankcase, and it is difficult to hit the exhaust gas sensor arranged behind the crankcase. As a result, the exhaust gas sensor can be protected from flying stones from the front.

請求項５に係る発明では、排気ガスセンサは、同乗者ステップの内側に配置される。同乗者ステップの内側に排気ガスセンサを配置したので、同乗者ステップに足を置く際に、排気ガスセンサが邪魔になり難い。   In the invention which concerns on Claim 5, an exhaust-gas sensor is arrange | positioned inside a passenger step. Since the exhaust gas sensor is disposed inside the passenger step, the exhaust gas sensor is unlikely to get in the way when placing a foot on the passenger step.

請求項６に係る発明では、消音器は、同乗者ステップに支持されており、排気ガスセンサから配線が延びており、この配線は、同乗者ステップの内側に沿って、車体カバー内に配策されているので、スイングアームの揺動の影響を考慮することなく配策できる。すなわち、配線を、一旦、スイングアームに沿わせて配策しようとすると、消音器とスイングアームの間で、配線を撓みをもたせて配策する対策が必要となる。
しかし、本発明は、消音器を支持するステップに配線を沿わせることで、配線は、同乗者ステップの内側に沿って、車体カバー内に配策されているので、配線に揺動を考慮した撓みをもたせて配策する対策は不要である。 In the invention according to claim 6, the silencer is supported by the passenger step, and the wiring extends from the exhaust gas sensor. The wiring is routed in the vehicle body cover along the inside of the passenger step. Therefore, the arrangement can be made without considering the influence of swinging of the swing arm. That is, once wiring is arranged along the swing arm, it is necessary to take measures to arrange the wiring with bending between the silencer and the swing arm.
However, according to the present invention, the wiring is arranged in the body cover along the inside of the passenger step by arranging the wiring along the step supporting the silencer, so that the wiring is considered to swing. There is no need to take any measures to provide deflection.

本発明に係る自動二輪車の右側面図である。1 is a right side view of a motorcycle according to the present invention. 本発明に係る自動二輪車の正面図である。1 is a front view of a motorcycle according to the present invention. 排気ガスセンサが備えられている消音器及びその周辺部の平面図である。It is a top view of a silencer provided with an exhaust gas sensor and its peripheral part. 図１の４−４線断面図であって、排気ガスセンサの配置構造等を説明する図である。FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 and illustrates an arrangement structure and the like of an exhaust gas sensor. 一部を破断した消音器の右側面図である。It is a right view of the silencer which fractured | ruptured a part. 消音器の平面図である。It is a top view of a silencer. 図１の７−７線断面図であって、排気ガスセンサとスイングアーム間のレイアウトを説明する図である。FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 1, illustrating a layout between an exhaust gas sensor and a swing arm. 図１の８−８線断面図である。FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 1.

以下、本発明の実施の形態について、詳細に説明する。図中及び実施例において、「上」、「下」、「前」、「後」、「左」、「右」は、各々、自動二輪車に乗車する運転者から見た方向を示す。   Hereinafter, embodiments of the present invention will be described in detail. In the drawings and examples, “up”, “down”, “front”, “rear”, “left”, and “right” respectively indicate directions viewed from the driver who rides the motorcycle.

本発明の実施例を図面に基づいて説明する。
図１に示すように、自動二輪車１０は、車体フレーム１１と、この車体フレーム１１に懸架されるエンジン１２と、車体フレーム１１に操向自在に設けられる前輪１３と、車体フレーム１１のピボット部１５に揺動自在に支持されるスイングアーム１６と、このスイングアーム１６の後端に設けられ回転可能に支持される後輪１４と、前輪１３と後輪１４の間にて車体フレーム１１に設けられ乗員が座るシート１７とを有し、このシート１７に乗員が跨って乗車する鞍乗り型車両である。 Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a motorcycle 10 includes a body frame 11, an engine 12 suspended on the body frame 11, a front wheel 13 provided on the body frame 11 so as to be steerable, and a pivot portion 15 of the body frame 11. A swing arm 16 that is swingably supported by the vehicle, a rear wheel 14 that is provided at the rear end of the swing arm 16 and is rotatably supported, and a front wheel 13 and a rear wheel 14 that are provided on the body frame 11. This is a saddle-ride type vehicle having a seat 17 on which an occupant sits and on which the occupant rides.

車体フレーム１１は、前輪１３を回動自在に支持するヘッドパイプ２１と、このヘッドパイプ２１から車両斜め後下方へ向け上に凸の略円弧状に延びるメインフレーム２２と、このメインフレーム２２の下方でヘッドパイプ２１から車両斜め後下方へ延びているダウンフレーム２３と、メインフレーム２２の下端に設けられるピボット部１５と、メインフレーム２２の中間部から後方へ延びるシートレール２４Ｌ、２４Ｒ（図手前側の符号２４Ｒのみ示す。）と、シートレール２４Ｌ、２４Ｒとピボット部１５の間に渡されるサポートフレーム２５Ｌ、２５Ｒ（図手前側の符号２５Ｒのみ示す。）とを主要素とする。   The vehicle body frame 11 includes a head pipe 21 that rotatably supports a front wheel 13, a main frame 22 that extends in a substantially arc shape that protrudes upward and obliquely downward from the head pipe 21, and a lower portion of the main frame 22. The down frame 23 that extends obliquely rearward and downward from the head pipe 21, the pivot portion 15 provided at the lower end of the main frame 22, and seat rails 24 </ b> L and 24 </ b> R that extend rearward from the middle portion of the main frame 22 And the support frames 25L and 25R (only the reference numeral 25R on the front side in the figure) passed between the seat rails 24L and 24R and the pivot portion 15 are main elements.

ヘッドパイプ２１に、ステアリング軸３１が回動可能に設けられ、このステアリング軸３１の上端に操向ハンドル３２が取付けられ、ステアリング軸３１の下端から前輪１３を支えるフロントフォーク３３が延びている。スイングアーム１６とシートレール２４Ｌ、２４Ｒの間に、クッションユニット３４Ｌ、３４Ｒ（図手前側の符号３４Ｒのみ示す。）が渡される。フロントフォーク３３に、フロントフェンダ３５が取付けられ、シートレール２４Ｌ、２４Ｒにリヤフェンダ３６が取付けられる。操向ハンドル３２の後方に燃料タンク３７が配置され、この燃料タンク３７の後方に連続するようにシート１７が配置される。   A steering shaft 31 is rotatably provided on the head pipe 21, a steering handle 32 is attached to the upper end of the steering shaft 31, and a front fork 33 that supports the front wheel 13 extends from the lower end of the steering shaft 31. Between the swing arm 16 and the seat rails 24L, 24R, cushion units 34L, 34R (only the reference numeral 34R on the front side in the figure is shown) are passed. A front fender 35 is attached to the front fork 33, and a rear fender 36 is attached to the seat rails 24L and 24R. A fuel tank 37 is disposed behind the steering handle 32, and the seat 17 is disposed so as to be continuous behind the fuel tank 37.

燃料タンク３７は、メインフレーム２２に支持され、シート１７は、シートレール２４Ｌ、２４Ｒに支持されている。また、エンジン１２から運転者が足を置くことができる運転者ステップ３８が車幅方向側方に延びており、サポートフレーム２５Ｌ、２５Ｒから同乗者が足を置くことができる同乗者ステップ３９Ｌ、３９Ｒ（図手前側の符号３９Ｒのみ示す。）が車幅方向側方に延びている。   The fuel tank 37 is supported by the main frame 22, and the seat 17 is supported by seat rails 24L and 24R. A driver step 38 that allows the driver to place his / her foot from the engine 12 extends laterally in the vehicle width direction, and the passenger steps 39L and 39R where the passenger can place his / her foot from the support frames 25L and 25R. (Only the reference numeral 39R on the front side of the figure is shown) extends laterally in the vehicle width direction.

エンジン１２から排気装置４０が延びており、この排気装置４０は、排気管４１と、この排気管４１の途中に介在される触媒４２と、排気管４１の下流端（後端）に連結される消音器４３とを主要素とする。消音器４３は、排気管４１の後端に接続されると共に、スイングアーム１６の外側に配置される。   An exhaust device 40 extends from the engine 12 and is connected to an exhaust pipe 41, a catalyst 42 interposed in the middle of the exhaust pipe 41, and a downstream end (rear end) of the exhaust pipe 41. The silencer 43 is a main element. The silencer 43 is connected to the rear end of the exhaust pipe 41 and is disposed outside the swing arm 16.

排気管４１の上流端は、エンジン１２の排気ポート６６に接続され、排気管４１の後部は、第１ステー４５を介してピボット部１５に取付けられると共に、消音器４３は、第２ステー４６を介して同乗者ステップ３９に取付けられ支持されている。   The upstream end of the exhaust pipe 41 is connected to the exhaust port 66 of the engine 12, the rear part of the exhaust pipe 41 is attached to the pivot part 15 via the first stay 45, and the silencer 43 is connected to the second stay 46. It is attached to and supported by the passenger step 39.

エンジン１２は、前エンジンハンガー４７を介してダウンフレーム２３の下端に取付けられると共に、後エンジンハンガー４８を介してピボット部１５に取付けられる。ピボット部１５にブレーキペダル４９が回動自在に設けられている。   The engine 12 is attached to the lower end of the down frame 23 via the front engine hanger 47 and attached to the pivot portion 15 via the rear engine hanger 48. A brake pedal 49 is rotatably provided on the pivot portion 15.

エンジン１２は、クランクケース５１と、このクランクケース５１の上面に載置され取付けられるシリンダブロック５２と、このシリンダブロック５２の上面に載置され取付けられるシリンダヘッド５３と、このシリンダヘッド５３の上面に載置され取付けられるヘッドカバー５４とを備え、クランクケース５１の下面に、下方から上方へオイルパン５５が取付けられている。クランクケース５１の図手前側の右側面に、クラッチカバー５６が取付けられている。   The engine 12 includes a crankcase 51, a cylinder block 52 mounted and mounted on the upper surface of the crankcase 51, a cylinder head 53 mounted and mounted on the upper surface of the cylinder block 52, and an upper surface of the cylinder head 53. An oil pan 55 is attached to the lower surface of the crankcase 51 from below to above. A clutch cover 56 is attached to the right side of the crankcase 51 on the front side of the figure.

シリンダヘッド５３の後面５３ｂに、吸気装置６０が連結される。シリンダヘッド５３の前面５３ａに排気ポート６６が設けられ、この排気ポート６６に排気装置４０が連結される。   An intake device 60 is connected to the rear surface 53 b of the cylinder head 53. An exhaust port 66 is provided on the front surface 53 a of the cylinder head 53, and the exhaust device 40 is connected to the exhaust port 66.

次に、車体カバー類について説明する。
車体カバー７０は、ヘッドパイプ２１の前方を覆うフロントカウル７１と、フロントカウル７１の後方で燃料タンク３７の前部側方を覆うタンクカウル７２Ｌ、７２Ｒ（図手前側の７２Ｒのみ示す。）と、このタンクカウル７２Ｌ、７２Ｒの後方でメインフレーム２２の後部及びピボット部１５を覆うミッドサイドカバー７３Ｌ、７３Ｒ（図手前側の７３Ｒのみ示す。）と、このミッドサイドカバー７３に連続するように設けられるリヤサイドカバー７４Ｌ、７４Ｒ（図手前側の７４Ｒのみ示す。）とからなる。フロントカウル７１の下部に前方へ突設されライセンスプレートが装着されるライセンスステー７５が設けられている。 Next, vehicle body covers will be described.
The vehicle body cover 70 includes a front cowl 71 that covers the front of the head pipe 21, tank cowls 72L and 72R that cover the front side of the fuel tank 37 behind the front cowl 71 (only the front 72R is shown). Midside covers 73L and 73R (only the front side 73R is shown) covering the rear portion of the main frame 22 and the pivot portion 15 behind the tank cowls 72L and 72R, and the midside cover 73 are provided to be continuous. Rear side covers 74L and 74R (only the front side 74R is shown). A license stay 75 is provided at the lower part of the front cowl 71 so as to project forward and to which a license plate is attached.

図２に示すように、車両正面視で、エンジン１２のクランクケース５１は、車幅方向左右外方に張り出すように設けられている。クランクケース５１の前方に、排気管４１が設けられている。この排気管４１は、クランクケース５１の下方まで延びている。図１に戻り、クランクケース５１の下方に延びている排気管４１は、車両後方へ延びており、その下流側は消音器４３に連結される。   As shown in FIG. 2, the crankcase 51 of the engine 12 is provided so as to project outward in the vehicle width direction left and right in the vehicle front view. An exhaust pipe 41 is provided in front of the crankcase 51. The exhaust pipe 41 extends below the crankcase 51. Returning to FIG. 1, the exhaust pipe 41 extending below the crankcase 51 extends rearward of the vehicle, and its downstream side is connected to a silencer 43.

次に、同乗者ステップ（同乗者ステップ）の構造等について説明する。
図３に示すように、同乗者が足を置く左右の同乗者ステップ３９Ｌ、３９Ｒは、各々、サポートフレーム２５Ｌ、２５Ｒ（図１参照）から車幅方向外方に延びた後、図裏側の下方へ向け延びておりパイプ状の第１アーム８１Ｌ、８１Ｒ及び第２アーム８２Ｌ、８２Ｒと、これらの第１アーム８１Ｌ、８１Ｒ及び第２アーム８２Ｌ、８２Ｒの下端に、各々設けられるステップ側ステー８３Ｌ、８３Ｒと、当該ステップ側ステー８３Ｌ、８３Ｒから車幅方向外方へ突設される足置部８４Ｌ、８４Ｒとからなる。 Next, the structure of the passenger step (passenger step) will be described.
As shown in FIG. 3, the left and right passenger steps 39L and 39R on which the passenger puts his / her feet extend from the support frames 25L and 25R (see FIG. 1) to the outside in the vehicle width direction, and then on the lower side of the figure Pipe-shaped first arms 81L, 81R and second arms 82L, 82R, and step-side stays 83L provided at the lower ends of these first arms 81L, 81R and second arms 82L, 82R, 83R, and foot rests 84L and 84R projecting outward from the step side stays 83L and 83R in the vehicle width direction.

右の同乗者ステップ３９Ｒの構成要素である右のステップ側ステー８３Ｒには、ボス部８５が付設される。このボス部８５に、締結部材８６を介して消音器側の第２ステー４６が締結されている。すなわち、消音器４３は、右の同乗者ステップ３９Ｒに支持されている。   A boss portion 85 is attached to the right step side stay 83R, which is a component of the right passenger step 39R. The second stay 46 on the silencer side is fastened to the boss portion 85 via a fastening member 86. That is, the silencer 43 is supported by the right passenger step 39R.

以下、排気装置及び排気ガスセンサの配置等について詳細に説明する。
図４に示すように、右の同乗者ステップ３９Ｒの下方に消音器４３が配置され、この消音器４３の外側面に、消音器カバー７７が取付けられている。消音器４３の内側面に、第２ステー４６が設けられ、この第２ステー４６の車両前方に、排気ガスセンサ６７が配置され、この排気ガスセンサ６７から配線６８が延びている。 Hereinafter, the arrangement of the exhaust device and the exhaust gas sensor will be described in detail.
As shown in FIG. 4, a silencer 43 is disposed below the right passenger step 39 </ b> R, and a silencer cover 77 is attached to the outer surface of the silencer 43. A second stay 46 is provided on the inner surface of the silencer 43, an exhaust gas sensor 67 is disposed in front of the second stay 46 in the vehicle, and a wiring 68 extends from the exhaust gas sensor 67.

図１及び図３を併せて参照し、排気ガスセンサ６７は、同乗者ステップ３９Ｒの内側に配置される。また、排気ガスセンサ６７から延びている配線６８は、同乗者ステップ３９Ｒの内側に沿って配策された後、同乗者ステップ３９Ｒに沿って配策されている。   1 and 3 together, the exhaust gas sensor 67 is disposed inside the passenger step 39R. The wiring 68 extending from the exhaust gas sensor 67 is routed along the passenger step 39R and then routed along the passenger step 39R.

図５及び図６に示すように、消音器４３は、ケース部９１と、このケース部９１の内側を区画するセパレータ部９２と、ケース部９１の内側に配策され排気管４１の後端部に連結される管部材９３とからなる。この管部材９３の上流端に、排気管４１が接続される。   As shown in FIGS. 5 and 6, the silencer 43 includes a case portion 91, a separator portion 92 that defines the inside of the case portion 91, and a rear end portion of the exhaust pipe 41 that is arranged inside the case portion 91. And a pipe member 93 connected to each other. An exhaust pipe 41 is connected to the upstream end of the pipe member 93.

ケース部９１は、排気管４１と接合される接合部９４と、この接合部９４から徐々に外径が大きくなるように拡径された拡径部９５と、この拡径部９５の後端部に接続され一定の外径で車両後方へ延びている円筒部９６と、この円筒部９６の下流端を塞ぐキャップ部９７とからなる。   The case portion 91 includes a joint portion 94 joined to the exhaust pipe 41, a diameter-increased portion 95 whose diameter is gradually increased from the joint portion 94, and a rear end portion of the diameter-expanded portion 95. And a cap portion 97 that closes the downstream end of the cylindrical portion 96.

セパレータ部９２は、第１セパレータ１０１と、この第１セパレータ１０１の車両後方に設けられる第２セパレータ１０２とからなる。第１セパレータ１０１及び第２セパレータ１０２は、ケース部９１の長手方向に垂直な方向に配置される。第１セパレータ１０１は、拡径部９５と円筒部９６との境界近傍に配置され、第２セパレータ１０２は、円筒部９６の後部に配置される。これらの第１セパレータ１０１及び第２セパレータ１０２によって、ケース部９１は、前から後に、第１室１０４と第２室１０５と第３室１０６とにこの順に区画される。   The separator portion 92 includes a first separator 101 and a second separator 102 that is provided behind the first separator 101 in the vehicle. The first separator 101 and the second separator 102 are arranged in a direction perpendicular to the longitudinal direction of the case portion 91. The first separator 101 is disposed in the vicinity of the boundary between the enlarged diameter portion 95 and the cylindrical portion 96, and the second separator 102 is disposed at the rear portion of the cylindrical portion 96. By these first separator 101 and second separator 102, the case portion 91 is partitioned into a first chamber 104, a second chamber 105, and a third chamber 106 in this order from the front to the back.

消音器４３の管部材９３は、第１セパレータ１０１及び第２セパレータ１０２によって支持され第３室１０６まで延びている第１管部材１０７と、第２セパレータ１０２及びキャップ部９７とによって支持される第２管部材１０８とからなる。第２室１０５に臨む位置にて第１管部材１０７に、多数の第１孔１１１を有し排気ガスを第１管部材１０７の外に流す第１デフューザ部１１４が設けられており、第３室１０６に臨む位置にて、第１管部材１０７の後端１０７ｂは、小キャップ１１７で塞がれ、この小キャップ１１７の前方位置にて第３室１０６に臨む位置に、第３デフューザ部１１６が設けられている。第３室１０６に臨む位置にて、第２管部材１０８に、多数の第２孔１１２を有し排気ガスを第２管部材１０８の外に流す第２デフューザ部１１５が設けられている。   The pipe member 93 of the silencer 43 is supported by the first pipe member 107 supported by the first separator 101 and the second separator 102 and extending to the third chamber 106, and the second separator 102 and the cap part 97. It consists of two pipe members 108. At the position facing the second chamber 105, the first pipe member 107 is provided with a first diffuser portion 114 having a large number of first holes 111 and flowing exhaust gas outside the first pipe member 107. The rear end 107 b of the first pipe member 107 is closed by a small cap 117 at a position facing the chamber 106, and the third diffuser portion 116 is positioned at a position facing the third chamber 106 at a position in front of the small cap 117. Is provided. At the position facing the third chamber 106, a second diffuser portion 115 having a large number of second holes 112 and flowing exhaust gas out of the second tube member 108 is provided in the second tube member 108.

第１管部材１０７に入った排気ガスは、第１孔１１１から第２室１０５へ流れると共に、第３デフューザ部１１６に設けた第３孔１１３を通過して第３室１０６に流れ、第３室１０６に流れた排気ガスは、第２孔１１２から第２管部材１０８に入り、第２管部材１０８の後端から外へ排出される。第２室１０５に流れた排気ガスは、第２管部材１０８の前端から入り、第２管部材１０８の後端から外へ排出される。   The exhaust gas that has entered the first pipe member 107 flows from the first hole 111 to the second chamber 105, passes through the third hole 113 provided in the third diffuser portion 116, flows to the third chamber 106, and is The exhaust gas that has flowed into the chamber 106 enters the second pipe member 108 through the second hole 112 and is discharged to the outside from the rear end of the second pipe member 108. The exhaust gas flowing into the second chamber 105 enters from the front end of the second pipe member 108 and is discharged outside from the rear end of the second pipe member 108.

排気管４１は、第１室１０４の内側を通り、第１セパレータ１０１を通って、消音器４３を構成する管部材９３の上流端に接続される。すなわち、排気管４１は、消音器４３の内側まで延びている。排気管４１内には、触媒４２が設けられる。この触媒４２は、消音器４３と排気管４１の接合部９４の近傍に設けられている。この触媒４２の下流側にて排気管４１に、排気管内の排気ガス成分を検出できる排気ガスセンサ６７が備えられている。排気ガスセンサ６７は、消音器４３の拡径部９５に取付けられている。   The exhaust pipe 41 passes through the inside of the first chamber 104, passes through the first separator 101, and is connected to the upstream end of the pipe member 93 constituting the silencer 43. That is, the exhaust pipe 41 extends to the inside of the silencer 43. A catalyst 42 is provided in the exhaust pipe 41. The catalyst 42 is provided in the vicinity of the joint portion 94 between the silencer 43 and the exhaust pipe 41. An exhaust gas sensor 67 capable of detecting an exhaust gas component in the exhaust pipe is provided in the exhaust pipe 41 on the downstream side of the catalyst 42. The exhaust gas sensor 67 is attached to the enlarged diameter portion 95 of the silencer 43.

図７に示すように、拡径部９５に、排気管４１に向かって窪む凹部１２１が設けられ、この凹部１２１に排気ガスセンサ６７が取付けられる。凹部１２１に対応する位置で、排気管４１は凹部１２１に寄った位置に設けられている。   As shown in FIG. 7, a recessed portion 121 that is recessed toward the exhaust pipe 41 is provided in the enlarged diameter portion 95, and the exhaust gas sensor 67 is attached to the recessed portion 121. The exhaust pipe 41 is provided at a position corresponding to the recess 121 and close to the recess 121.

排気ガスセンサ６７は、拡径部９５に取付けられると共に、排気管４１とスイングアーム１６の間に設けられる。拡径部９５に、排気管４１に向かって窪む凹部１２１が設けられ、この凹部１２１に排気ガスセンサ６７が取付けられる。前述したように、凹部１２１に対応する位置で、排気管４１は凹部１２１に寄った位置に設けられる。   The exhaust gas sensor 67 is attached to the enlarged diameter portion 95 and is provided between the exhaust pipe 41 and the swing arm 16. A recessed portion 121 that is recessed toward the exhaust pipe 41 is provided in the enlarged diameter portion 95, and the exhaust gas sensor 67 is attached to the recessed portion 121. As described above, the exhaust pipe 41 is provided at a position corresponding to the recess 121 at a position close to the recess 121.

図２に戻り、車両正面視で、排気ガスセンサ６７は、エンジン１２のクランクケース５１と重なる位置に配置される。すなわち、排気ガスセンサ６７は、クランクケース５１の後方でクランクケース５１に重なるように配置される。   Returning to FIG. 2, the exhaust gas sensor 67 is disposed at a position overlapping the crankcase 51 of the engine 12 in a front view of the vehicle. That is, the exhaust gas sensor 67 is disposed behind the crankcase 51 so as to overlap the crankcase 51.

排気ガスセンサ６７は、エンジン１２のクランクケース５１と重なる位置に配置されるので、走行中に、前方から飛散する飛び石等はクランクケース５１に当たり、このクランクケース５１の後方に配置した排気ガスセンサ６７には当り難い。結果、前方からの飛び石等から排気ガスセンサ６７を保護できる。   Since the exhaust gas sensor 67 is disposed at a position overlapping the crankcase 51 of the engine 12, a stepping stone or the like scattered from the front hits the crankcase 51 during traveling, and the exhaust gas sensor 67 disposed behind the crankcase 51 Hard to hit. As a result, the exhaust gas sensor 67 can be protected from flying stones from the front.

図８に示すように、右の同乗者ステップ３９Ｒの構成要素でありパイプ状を呈する第１ステー４５Ｒ及び第２ステー４６Ｒのうちの第１ステー４５Ｒに、車幅方向内側に窪ませた、窪み部１２２が形成される。この窪み部１２２に、排気ガスセンサ６７から延びている配線６８を沿わせた。窪み部１２２は、車幅方向内方から車体カバー７０の構成要素であるカバー部材７８で覆われている。すなわち、配線６８は、同乗者ステップ３９Ｌ、３９Ｒの内側に沿って、車体カバー７０の構成要素であるカバー部材７８内に配策されている。   As shown in FIG. 8, a recess is formed in the first stay 45R of the first stay 45R and the second stay 46R, which are components of the right passenger step 39R and have a pipe shape, inward in the vehicle width direction. A portion 122 is formed. A wiring 68 extending from the exhaust gas sensor 67 was placed along the recess 122. The recess 122 is covered with a cover member 78 that is a component of the vehicle body cover 70 from the inside in the vehicle width direction. That is, the wiring 68 is routed in the cover member 78 that is a component of the vehicle body cover 70 along the inside of the passenger steps 39L and 39R.

なお、本実施例では、配線は、カバー部材で覆われているが、この他、例えば、リヤサイドカバーやリヤフェンダなどを延長して、同乗者ステップを内側から覆うようにすることは差支えない。   In the present embodiment, the wiring is covered with the cover member. However, for example, the rear side cover and the rear fender may be extended to cover the passenger step from the inside.

以上に述べた排気ガスセンサが備えられている自動二輪車の作用を次に述べる。
図７に戻り、排気ガスセンサ６７は、消音器４３に備えられている拡径部９５に取付けられる。拡径部９５のスペースを利用して排気ガスセンサ６７を取付けることができれば、排気ガスセンサ６７を消音器４３の外側に大きく張り出さないように配置できる。従って、消音器４３に排気ガスセンサ６７が備えられている自動二輪車１０において、車両の大型化を抑えることができる。また、排気ガスセンサ６７は、排気管４１とスイングアーム１６の間に挟まれるように配置されるので、車両の外観性が損なわれる心配もない。 Next, the operation of the motorcycle equipped with the exhaust gas sensor described above will be described.
Returning to FIG. 7, the exhaust gas sensor 67 is attached to the enlarged diameter portion 95 provided in the silencer 43. If the exhaust gas sensor 67 can be attached using the space of the enlarged diameter portion 95, the exhaust gas sensor 67 can be arranged so as not to protrude greatly to the outside of the silencer 43. Therefore, in the motorcycle 10 in which the silencer 43 is provided with the exhaust gas sensor 67, an increase in the size of the vehicle can be suppressed. Further, since the exhaust gas sensor 67 is disposed so as to be sandwiched between the exhaust pipe 41 and the swing arm 16, there is no fear that the appearance of the vehicle is impaired.

また、拡径部９５に凹部１２１が設けられ、この凹部１２１に排気ガスセンサ６７が取付けられる。排気ガスセンサ６７は、凹部１２１に収容されるので、凹部１２１が形成されない場合に比べ排気ガスセンサ６７の張出量を抑えることができる。また、排気ガスセンサ６７の張出量が減るので、外からの影響を受け難くすることができる。   Further, a recessed portion 121 is provided in the enlarged diameter portion 95, and the exhaust gas sensor 67 is attached to the recessed portion 121. Since the exhaust gas sensor 67 is housed in the recess 121, the amount of overhang of the exhaust gas sensor 67 can be suppressed as compared with the case where the recess 121 is not formed. In addition, since the amount of overhang of the exhaust gas sensor 67 is reduced, it is possible to make it less susceptible to external influences.

排気管４１は凹部１２１に寄った位置に設けられる。凹部１２１に寄せて排気管４１を配策したので、凹部１２１が窪む量を小さくできる。窪み量が小さい凹部１２１になれば、加工工数を抑制できる。   The exhaust pipe 41 is provided at a position close to the recess 121. Since the exhaust pipe 41 is arranged close to the recess 121, the amount of depression of the recess 121 can be reduced. If it becomes the recessed part 121 with a small amount of hollows, a processing man-hour can be suppressed.

図３及び図４に戻り、排気ガスセンサ６７は、同乗者ステップ３９Ｌ、３９Ｒの内側に配置される。同乗者ステップ３９Ｌ、３９Ｒの内側に排気ガスセンサ６７を配置したので、同乗者ステップ３９Ｌ、３９Ｒに足を置く際に、排気ガスセンサ６７が邪魔になり難い。   3 and 4, the exhaust gas sensor 67 is disposed inside the passenger steps 39L and 39R. Since the exhaust gas sensor 67 is disposed inside the passenger steps 39L and 39R, the exhaust gas sensor 67 is unlikely to get in the way when the feet are placed on the passenger steps 39L and 39R.

図１及び図８を併せて参照し、排気ガスセンサ６７から延びている配線６８は、消音器４３が支持される同乗者ステップ３９Ｒの内側に沿って、車体カバー７０内に配策されている。仮に、排気ガスセンサから延びている配線を消音器に沿って配策しようとすると、そのままでは、消音器が温度上昇するため、配策は難しい。別途、遮熱対策を施す必要がある。また、上記配線を、一旦、スイングアームに沿わせて配策しようとすると、消音器とスイングアームの間で、配線を撓みをもたせて配策する対策が必要となる。   Referring to FIGS. 1 and 8 together, the wiring 68 extending from the exhaust gas sensor 67 is routed in the vehicle body cover 70 along the inside of the passenger step 39R where the silencer 43 is supported. If the wiring extending from the exhaust gas sensor is to be routed along the silencer, the silencer will rise in temperature, and the routing is difficult. It is necessary to take measures against heat insulation separately. Further, once the wiring is arranged along the swing arm, it is necessary to take measures to arrange the wiring with bending between the silencer and the swing arm.

この点、本発明では、配線６８は、同乗者ステップ３９Ｒの内側に沿って、車体カバー７０内に配策されているので、配線６８を撓みをもたせて配策する対策は不要である。同乗者が足を載せる同乗者ステップ３９Ｒに、消音器４３を支持する機能を兼ねさせ、この同乗者ステップ３９Ｒの内側に、消音器４３から延びる排気ガスセンサ６７の配線６８を配策するようにした。同乗者ステップ３９Ｒは、揺動しないため、配線６８の長さを短くできる。また、配線６８を同乗者ステップ３９Ｒの内側に配策したので、配線６８は外から見えなくなり、車両の外観性が損なわれる心配もない。   In this regard, in the present invention, the wiring 68 is routed in the vehicle body cover 70 along the inside of the passenger step 39R. Therefore, it is not necessary to take measures to route the wiring 68 with bending. The passenger step 39R where the passenger puts his / her foot also has a function of supporting the silencer 43, and the wiring 68 of the exhaust gas sensor 67 extending from the silencer 43 is arranged inside the passenger step 39R. . Since the passenger step 39R does not swing, the length of the wiring 68 can be shortened. Further, since the wiring 68 is routed inside the passenger step 39R, the wiring 68 is not visible from the outside, and there is no fear that the appearance of the vehicle is impaired.

なお、本実施例の排気ガスセンサは、排気ガス中の酸素濃度を測定する酸素センサ（Ｏ２センサ）を用いている。Ｏ２センサは安価であるため好適であるが、Ｏ２センサに限定されることなく、排気ガス中の成分を検出できるセンサであれば、その種類は問わず任意の種類のセンサでも良い。例えば、ＣＯセンサやＮＯｘセンサ等がある。 Note that the exhaust gas sensor of this embodiment uses an oxygen sensor (O 2 sensor) that measures the oxygen concentration in the exhaust gas. The O 2 sensor is preferable because it is inexpensive, but is not limited to the O 2 sensor, and any type of sensor may be used as long as it can detect components in the exhaust gas. For example, there are a CO sensor and a NO x sensor.

尚、本発明は、実施の形態では自動二輪車に適用したが、三輪車にも適用可能であり、一般の車両に適用することは差し支えない。   Although the present invention is applied to a motorcycle in the embodiment, it can also be applied to a tricycle and can be applied to a general vehicle.

本発明は、排気管に排気ガスセンサが備えられている自動二輪車に好適である。   The present invention is suitable for a motorcycle in which an exhaust gas sensor is provided in an exhaust pipe.

１０…自動二輪車、１２…エンジン、１４…後輪、１６…スイングアーム、３９Ｌ、３９Ｒ…同乗者ステップ（ピリオンステップ）、４１…排気管、４２…触媒、４３…消音器、５１…クランクケース、６６…排気ポート、６７…排気ガスセンサ、６８…配線、７８…カバー部材、９４…接合部、９５…拡径部、１２１…凹部。   DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 12 ... Engine, 14 ... Rear wheel, 16 ... Swing arm, 39L, 39R ... Passenger step (Pillion step), 41 ... Exhaust pipe, 42 ... Catalyst, 43 ... Silencer, 51 ... Crankcase, 66 ... exhaust port, 67 ... exhaust gas sensor, 68 ... wiring, 78 ... cover member, 94 ... joint part, 95 ... enlarged diameter part, 121 ... concave part.

Claims (6)

後輪（１４）を回転可能に支持するスイングアーム（１６）と、
エンジン（１２）と、
このエンジン（１２）の排気ポート（６６）に接続される排気管（４１）と、
前記スイングアーム（１６）の外側に配置されると共に、前記排気管（４１）の後端に接続される消音器（４３）と、
前記排気管（４１）内に設けられる触媒（４２）と、
前記排気管（４１）内の排気ガス成分を検出できる排気ガスセンサ（６７）とを備える自動二輪車であって、
前記触媒（４２）は、前記消音器（４３）と前記排気管（４１）の接合部（９４）の近傍に設けられ、
前記消音器（４３）は、前記接合部（９４）から徐々に拡径された拡径部（９５）を備え、
前記排気ガスセンサ（６７）は、前記拡径部（９５）に取付けられると共に、前記排気管（４１）と前記スイングアーム（１６）の間に設けられることを特徴とする自動二輪車。 A swing arm (16) that rotatably supports the rear wheel (14);
An engine (12);
An exhaust pipe (41) connected to the exhaust port (66) of the engine (12);
A silencer (43) disposed outside the swing arm (16) and connected to a rear end of the exhaust pipe (41);
A catalyst (42) provided in the exhaust pipe (41);
A motorcycle comprising an exhaust gas sensor (67) capable of detecting an exhaust gas component in the exhaust pipe (41);
The catalyst (42) is provided in the vicinity of a joint (94) between the silencer (43) and the exhaust pipe (41),
The silencer (43) includes an enlarged diameter portion (95) that is gradually enlarged from the joint portion (94),
The motorcycle, wherein the exhaust gas sensor (67) is attached to the enlarged diameter portion (95) and is provided between the exhaust pipe (41) and the swing arm (16). 前記拡径部（９５）に、前記排気管（４１）に向かって窪む凹部（１２１）が設けられ、この凹部（１２１）に前記排気ガスセンサ（６７）が取付けられることを特徴とする請求項１記載の自動二輪車。   The recessed portion (121) recessed toward the exhaust pipe (41) is provided in the enlarged diameter portion (95), and the exhaust gas sensor (67) is attached to the recessed portion (121). The motorcycle according to 1. 前記凹部（１２１）に対応する位置で、前記排気管（４１）の中心（Ｃ２）は、前記拡径部（９５）の中心（Ｃ１）から前記凹部（１２１）に寄った位置に設けられる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。   At the position corresponding to the recess (121), the center (C2) of the exhaust pipe (41) is provided at a position close to the recess (121) from the center (C1) of the enlarged diameter portion (95). The motorcycle according to claim 1 or 2, characterized in that. 車両正面視で、前記排気ガスセンサ（６７）は、前記エンジン（１２）のクランクケース（５１）と重なる位置に配置されることを特徴とする請求項１〜３のいずれか１項記載の自動二輪車。   The motorcycle according to any one of claims 1 to 3, wherein the exhaust gas sensor (67) is disposed at a position overlapping with a crankcase (51) of the engine (12) in a front view of the vehicle. . 前記自動二輪車に、更に、同乗者が足を置く同乗者ステップ（３９）が備えられ、
この同乗者ステップ（３９）の内側に、前記排気ガスセンサ（６７）が配置されることを特徴とする請求項１〜４のいずれか１項記載の自動二輪車。 The motorcycle further includes a passenger step (39) for the passenger to place his / her foot.
The motorcycle according to any one of claims 1 to 4, wherein the exhaust gas sensor (67) is arranged inside the passenger step (39). 前記消音器（４３）は、前記同乗者ステップ（３９）に支持されており、
前記排気ガスセンサ（６７）から配線（６８）が延びており、
この配線（６８）は、同乗者ステップ（３９）の内側に沿って、前記車体カバー（７８）内に配策されていることを特徴とする請求項５記載の自動二輪車。 The silencer (43) is supported by the passenger step (39),
A wiring (68) extends from the exhaust gas sensor (67),
6. The motorcycle according to claim 5, wherein the wiring (68) is routed in the vehicle body cover (78) along the inside of the passenger step (39).
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