JPH11343895A - Exhaust gas sensor arrangement structure of motorcycle - Google Patents

Exhaust gas sensor arrangement structure of motorcycle

Info

Publication number
JPH11343895A
JPH11343895A JP10149509A JP14950998A JPH11343895A JP H11343895 A JPH11343895 A JP H11343895A JP 10149509 A JP10149509 A JP 10149509A JP 14950998 A JP14950998 A JP 14950998A JP H11343895 A JPH11343895 A JP H11343895A
Authority
JP
Japan
Prior art keywords
gas sensor
exhaust gas
exhaust
exhaust pipe
motorcycle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10149509A
Other languages
Japanese (ja)
Other versions
JP4057145B2 (en
Inventor
Koichi Shimamura
幸一 嶋村
Koji Kano
宏司 狩野
Mitsuo Kusa
光男 草
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP14950998A priority Critical patent/JP4057145B2/en
Publication of JPH11343895A publication Critical patent/JPH11343895A/en
Application granted granted Critical
Publication of JP4057145B2 publication Critical patent/JP4057145B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/20—Multi-cylinder engines with cylinders all in one line
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1816—Number of cylinders four
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

PROBLEM TO BE SOLVED: To omit a protective cover by making a lower part protrusion and an exhaust pipe protect an exhaust gas sensor from flying gravel. SOLUTION: With regard to a motorcycle having an engine 7 provided with a lower part protrusion such as an oil pan 23 arranged between the front rear wheels and an exhaust pipe 17 extended from the engine 7 to the rear of the body through the lower part of the lower part protrusion with an exhaust gas sensor 31 arranged on the exhaust pipe 17, the exhaust gas sensor 31 is vertically mounted on a sensor mounting part 32 provided on the upper surface 17a of the exhaust pipe 17 at the position away from the rear surface 23a of the lower protrusion rearward by a specific dimension Z1.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は自動二輪車の排気ガ
スセンサ配置構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas sensor arrangement for a motorcycle.

【０００２】[0002]

【従来の技術】自動二輪車の排気ガスセンサ配置構造に
関する考案として、例えば実開昭５８−８２４２０号公
報「自動２輪車における排気ガスセンサ装置」がある。
この自動２輪車における排気ガスセンサ装置は、同公報
の第３図によれば、排気管５に排気ガスセンサ６を地面
に対し平行に配置し、エンジン３の底面に排気ガスセン
サ６の保護カバ７を螺子８で取付けたものである。保護
カバ７は排気ガスセンサ６の前方及び下方を保護し、飛
散する石や地面との接触から排気ガスセンサ６を守る部
材である。2. Description of the Related Art For example, Japanese Utility Model Laid-Open Publication No. Sho 58-82420 discloses an exhaust gas sensor arrangement for a motorcycle.
According to FIG. 3 of the publication, the exhaust gas sensor device of this motorcycle has an exhaust gas sensor 6 arranged on an exhaust pipe 5 parallel to the ground, and a protective cover 7 for the exhaust gas sensor 6 on the bottom surface of the engine 3. It is attached with screws 8. The protection cover 7 is a member that protects the front and the bottom of the exhaust gas sensor 6 and protects the exhaust gas sensor 6 from contact with flying stones or the ground.

【０００３】[0003]

【発明が解決しようとする課題】上記公報の構造は、エ
ンジン３の底面に保護カバ７を螺子８で取付けなければ
ならない。雌ねじを立てたり保護カバ７を取付けるとい
った設計・生産コストが発生するため、コストアップと
なる。また、保護カバ７を取付けることは軽量化を阻害
する要因でもある。さらに、保護カバ７が排気ガスセン
サ６の周囲を被っているため、空気の流れが悪く、排気
ガスセンサ６の外面からの放熱を妨げている。排気管５
の外にある排気ガスセンサ６の本体部は、電気信号用の
ケーブルなど耐熱性の低い部品を内蔵しているため、比
較的、常温に近い雰囲気で使うことが求められる。とこ
ろが、走行風による冷却や自然冷却が難かしい。In the structure disclosed in the above publication, the protective cover 7 must be attached to the bottom surface of the engine 3 with screws 8. Design and production costs, such as erecting a female screw and attaching the protective cover 7, occur, which increases costs. The attachment of the protective cover 7 is also a factor that hinders weight reduction. Further, since the protective cover 7 covers the periphery of the exhaust gas sensor 6, the flow of air is poor, and heat radiation from the outer surface of the exhaust gas sensor 6 is hindered. Exhaust pipe 5
Since the main body of the exhaust gas sensor 6 outside the box contains components having low heat resistance such as a cable for an electric signal, it is required to be used in an atmosphere relatively close to normal temperature. However, it is difficult to cool by the traveling wind or natural cooling.

【０００４】そこで、本発明の目的は、保護カバーを必
要としない自動二輪車の排気ガスセンサ配置構造を提供
することにある。An object of the present invention is to provide a motorcycle exhaust gas sensor arrangement structure which does not require a protective cover.

【０００５】[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、オイルパンなどの下部突起部を備えたエ
ンジンを前後輪間に配置し、このエンジンから下部突起
部の下方を経て車体後方へ排気管を延ばし、この排気管
に排気ガスセンサを配置した自動二輪車において、排気
ガスセンサを、下部突起部の後面から所定寸法後方に離
れた位置にて排気管の上面に設けたセンサ取付け部に、
縦向きに取付けたことを特徴とする。According to a first aspect of the present invention, an engine having a lower projection such as an oil pan is disposed between the front and rear wheels, and the engine is arranged below the lower projection from the engine. In a motorcycle in which an exhaust pipe is extended rearward of a vehicle body and an exhaust gas sensor is disposed in the exhaust pipe, a sensor mounting portion is provided on an upper surface of the exhaust pipe at a position separated from a rear surface of a lower projection by a predetermined distance behind the exhaust pipe. To
It is characterized by being mounted vertically.

【０００６】排気ガスセンサを排気管の上面に縦向きに
取付けたことにより、下から見たときに排気ガスセンサ
は排気管の陰になる。すなわち、飛び石の大部分は排気
管に当るため、排気ガスセンサに達しない。排気ガスセ
ンサを下部突起部の後面から隙間をもたせて設けたの
で、下部突起部に沿って後方へ流れる飛び石が、この隙
間を通過して落下することとなり、排気ガスセンサの前
方に溜る心配はない。従って、排気ガスセンサをオイル
パンなどの下部突起部の後面から所定寸法後方に離れた
位置にて排気管の上面に縦向きに取付けることで、飛び
石から排気ガスセンサを良好に保護することができる。Since the exhaust gas sensor is mounted vertically on the upper surface of the exhaust pipe, the exhaust gas sensor is behind the exhaust pipe when viewed from below. That is, most of the stepping stones hit the exhaust pipe, and do not reach the exhaust gas sensor. Since the exhaust gas sensor is provided with a gap from the rear surface of the lower protruding portion, the stepping stone flowing backward along the lower protruding portion falls through the gap, and there is no concern that the stepping stone will accumulate in front of the exhaust gas sensor. Therefore, the exhaust gas sensor can be satisfactorily protected from flying stones by vertically mounting the exhaust gas sensor on the upper surface of the exhaust pipe at a position away from the rear surface of the lower projection such as an oil pan by a predetermined distance rearward.

【０００７】更に、排気ガスセンサを下部突起部の後面
から隙間をもたせた位置に配置したので、この隙間が空
気の通路となり、十分な量の空気で排気ガスセンサを冷
却することができる。Further, since the exhaust gas sensor is disposed at a position with a gap from the rear surface of the lower projection, the gap serves as an air passage, and the exhaust gas sensor can be cooled with a sufficient amount of air.

【０００８】[0008]

【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。「前」「後」「左」「右」は運転者を基準
とする。図１は本発明に係る自動二輪車の側面図であ
り、自動二輪車１は、車体フレーム２と、この車体フレ
ーム２の前端のヘッドパイプ３に操向自在に取付けたハ
ンドルポスト４及びフロントフォーク５と、このフロン
トフォーク５に取付けた前輪６と、車体フレーム２の中
央下部に配置したエンジン７と、上部に配置した燃料タ
ンク８及びシート９と、車体フレーム２の後部下部から
上下動可能に延ばしたスイングアーム１１と、このスイ
ングアーム１１の後部に取付けた後輪１２と、この後輪
１２に取付けたリヤスプロケット１３と、このリヤスプ
ロケット１３に駆動力を伝達するチェーン１４とからな
る。Embodiments 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. “Front”, “rear”, “left” and “right” are based on the driver. FIG. 1 is a side view of a motorcycle according to the present invention. The motorcycle 1 includes a body frame 2, a handle post 4 and a front fork 5 slidably attached to a head pipe 3 at a front end of the body frame 2. A front wheel 6 attached to the front fork 5, an engine 7 disposed at a lower center portion of the vehicle body frame 2, a fuel tank 8 and a seat 9 disposed at an upper portion, and a vertically extending lower rear portion of the vehicle body frame 2. The vehicle includes a swing arm 11, a rear wheel 12 attached to a rear portion of the swing arm 11, a rear sprocket 13 attached to the rear wheel 12, and a chain 14 for transmitting a driving force to the rear sprocket 13.

【０００９】図２は本発明に係るエンジン並びに排気ガ
スセンサ配置構造の要部拡大図である。エンジン７は４
気筒エンジンであり、シリンダブロック２１と、このシ
リンダブロック２１の下に取付けたクランクケース２２
と、このクランクケース２２に取付けた下部突起部であ
るとこころのオイルパン２３と、シリンダブロック２１
の上に取付けたシリンダヘッド２４と、このシリンダヘ
ッド２４の上に取付けたシリンダヘッドカバー２５とか
らなる。エンジン７は前部上部に４個の排気ポート２７
…（この図では手前の１個のみを示す。）を備える。こ
れらの排気ポート２７…は、エンジン７から下方を経て
車体後方へ延ばした排気管１７を取付けるものである。
排気管１７は排気ガスセンサ３１を取付けたものであ
る。詳しくは、排気管１７の上面１７ａに、且つオイル
パン２３の後面２３ａから所定寸法Ｚ１だけ後方に離れ
た位置にセンサ取付け部３２を設け、このセンサ取付け
部３２に排気ガスセンサ３１をねじ込みにて縦方向に取
付けたものである。Ｙ１は排気管１７の上面１７ａから
オイルパン２３の下面２３ｂまでの離間距離である。２
６はキャブレターである。FIG. 2 is an enlarged view of an essential part of the arrangement of the engine and the exhaust gas sensor according to the present invention. Engine 7 is 4
A cylinder engine, a cylinder block 21, and a crankcase 22 mounted below the cylinder block 21.
An oil pan 23 which is a lower projection attached to the crankcase 22;
And a cylinder head cover 25 mounted on the cylinder head 24. The engine 7 has four exhaust ports 27 at the top front.
.. (Only the front one is shown in this figure). The exhaust ports 27 are provided with exhaust pipes 17 extending downward from the engine 7 to the rear of the vehicle body.
The exhaust pipe 17 is provided with an exhaust gas sensor 31. Specifically, a sensor mounting portion 32 is provided on the upper surface 17a of the exhaust pipe 17 and at a position away from the rear surface 23a of the oil pan 23 by a predetermined distance Z1. The exhaust gas sensor 31 is vertically screwed into the sensor mounting portion 32. It is mounted in the direction. Y1 is a separation distance from the upper surface 17a of the exhaust pipe 17 to the lower surface 23b of the oil pan 23. 2
6 is a carburetor.

【００１０】排気ガスセンサ３１は、排気ガスに直接に
接触する素子部３１ａと、この素子部３１ａを支える本
体部３１ｂとからなる。素子部３１ａ及び本体部３１ｂ
の詳細な説明は省略する。[0010] The exhaust gas sensor 31 comprises an element portion 31a that directly contacts the exhaust gas, and a main body portion 31b that supports the element portion 31a. Element part 31a and main part 31b
The detailed description of is omitted.

【００１１】図３は図２の３−３線断面図であり、排気
管１７は、シリンダブロック２１の排気ポート２７（図
２参照）に接続する前部排気管１７ｂ，１７ｃ，１７
ｄ，１７ｅと、これらの前部排気管１７ｂ〜１７ｅをま
とめて排気ガスを一箇所に集める集合管１７ｆとからな
る。集合管１７ｆは後方の排気ガス浄化装置１７ｇを介
してマフラ１７ｈ（図１参照）に接続するものである。FIG. 3 is a sectional view taken along line 3-3 of FIG. 2. The exhaust pipe 17 is connected to an exhaust port 27 of the cylinder block 21 (see FIG. 2).
d, 17e, and a collecting pipe 17f that collects the exhaust gas at one place by combining these front exhaust pipes 17b to 17e. The collecting pipe 17f is connected to a muffler 17h (see FIG. 1) via a rear exhaust gas purification device 17g.

【００１２】センサ取付け部３２は、排気ガスセンサ３
１をねじ込むめねじであり、オイルパン２３の後面２３
ａから所定寸法Ｚ１で、かつ所定のガスセンサ防護エリ
アδの範囲内に位置する。詳しくは、オイルパン２３は
車幅中央に配置したものである。ここで、オイルパン２
３の後部右コーナを点Ａとし、オイルパン２３の後部左
コーナを点Ｂとし、また、オイルパン２３の後方で車幅
中心上の所定の点をＣとする。点Ａと点Ｂと点Ｃとで囲
んだ想像線にて示す三角形のエリアをガスセンサ防護エ
リアδとする。線ＡＣはオイルパン２３の右側面２３ｃ
から角度θだけ傾斜した線であり、線ＢＣはオイルパン
２３の左側面２３ｄから角度θだけ傾斜した線である。
ガスセンサ防護エリアδの範囲内に排気ガスセンサ３１
を取付けた。ガスセンサ防護エリアδは、ＡＢＣで囲ま
れた範囲内であり、排気ガスセンサ３１を配置するのに
最もよい範囲である。角度θは経験的に求めた角度であ
り、約３０°である。The sensor mounting part 32 is provided with the exhaust gas sensor 3.
1 is a female screw into which the oil pan 1 is screwed.
a is a predetermined dimension Z1 from a, and is located within a predetermined gas sensor protection area δ. More specifically, the oil pan 23 is disposed at the center of the vehicle width. Here, oil pan 2
3, the rear right corner is point A, the rear left corner of the oil pan 23 is point B, and a predetermined point on the center of the vehicle width behind the oil pan 23 is C. A triangular area indicated by an imaginary line surrounded by points A, B, and C is defined as a gas sensor protection area δ. Line AC is the right side 23c of the oil pan 23
, And a line BC is a line inclined from the left side surface 23d of the oil pan 23 by an angle θ.
The exhaust gas sensor 31 is located within the gas sensor protection area δ.
Was installed. The gas sensor protection area δ is within the range surrounded by ABC, and is the best range for arranging the exhaust gas sensor 31. Is the angle determined empirically, and is about 30 °.

【００１３】以上に述べた自動二輪車の排気ガスセンサ
配置構造の作用を次に説明する。図４は本発明に係る排
気ガスセンサ配置構造の第１作用説明図であり、前輪６
によって巻上げあげられる飛び石Ｓ１〜Ｓ４の挙動の一
例、及び走行風の流れを示す。飛び石Ｓ１は、最も低く
飛んだ石であり、集合管１７ｆの下面に当り、後方へ飛
んで行く。飛び石Ｓ２は、飛び石Ｓ１よりも上方を飛ん
だ石であり、前部排気管１７ｂ〜１７ｅの間を通過し
て、集合管１７ｆの前面に当り、前方に跳ね返る。The operation of the above-described motorcycle exhaust gas sensor arrangement structure will be described below. FIG. 4 is an explanatory view of a first operation of the exhaust gas sensor arrangement structure according to the present invention.
1 shows an example of the behavior of stepping stones S1 to S4 that are hoisted up, and the flow of traveling wind. The stepping stone S1 is the lowest flying stone, hits the lower surface of the collecting pipe 17f, and flies backward. The stepping stone S2 is a stone flying above the stepping stone S1, passes between the front exhaust pipes 17b to 17e, hits the front surface of the collecting pipe 17f, and rebounds forward.

【００１４】飛び石Ｓ３は、飛び石Ｓ２よりも上方を飛
んだ石であり、前部排気管１７ｂ〜１７ｅの間を通過し
て、オイルパン２３の下面２３ｂに当り、跳ね返って集
合管１７ｆの上面から後方へ至る。飛び石Ｓ３が排気管
１７の上面１７ａに飛んできても、排気ガスセンサ３１
に至る迄に複数回跳ね返ることとなるため、その間にエ
ネルギーが大きく減衰する。その結果、飛び石Ｓ３は隙
間を通過して下方に落下するので、排気ガスセンサ３１
に達する心配はない。また、離間距離Ｙ１及び所定寸法
Ｚ１を設けているから、排気管１７の上面１７ａや集合
管１７ｆの上面に石や土砂が堆積し難い。飛び石Ｓ４
は、飛び石Ｓ３よりも上方を飛んだ石であり、オイルパ
ン２３の下面２３ｂにあたり道路に落ちる。The stepping stone S3 is a stone flying above the stepping stone S2, passes between the front exhaust pipes 17b to 17e, hits the lower surface 23b of the oil pan 23, bounces off from the upper surface of the collecting pipe 17f. To the back. Even if the stepping stone S3 flies to the upper surface 17a of the exhaust pipe 17, the exhaust gas sensor 31
Bounces several times before reaching, and during that time the energy is greatly attenuated. As a result, the stepping stone S3 passes through the gap and falls downward, so that the exhaust gas sensor 31
Don't worry about reaching. Further, since the separation distance Y1 and the predetermined dimension Z1 are provided, stones and earth and sand are unlikely to be deposited on the upper surface 17a of the exhaust pipe 17 and the upper surface of the collecting pipe 17f. Stepping stone S4
Is a stone that flew above the stepping stone S3, hits the lower surface 23b of the oil pan 23, and falls on the road.

【００１５】つまり、小形化した排気ガスセンサ３１
を、下部突起部であるオイルパン２３の後方にて排気管
１７の上面１７ａに縦向きに取付けたので、排気管１７
及びオイルパン２３は保護カバーを兼ね、排気管１７及
びオイルパン２３が飛び石Ｓ１〜Ｓ４から排気ガスセン
サ３１を保護する。また、クランクケース２２も飛び石
や土砂から排気ガスセンサ３１を保護する。That is, the exhaust gas sensor 31 is downsized.
Is vertically mounted on the upper surface 17a of the exhaust pipe 17 behind the oil pan 23, which is a lower projection.
The oil pan 23 also serves as a protective cover, and the exhaust pipe 17 and the oil pan 23 protect the exhaust gas sensor 31 from flying stones S1 to S4. Further, the crankcase 22 also protects the exhaust gas sensor 31 from stepping stones and earth and sand.

【００１６】次に、排気ガスセンサ３１の熱的環境につ
いて述べる。エンジン７の排気ガスは、太い矢印の如く
前部排気管１７ｂ〜１７ｅを通り、合流し、排気ガスセ
ンサ３１の素子部３１ａに接触して成分が検出された後
に大気に排出される。このとき、排気ガスセンサ３１の
本体部３１ｂに排気ガスの熱が伝わる。ところで、オイ
ルパン２３と排気管１７との間は離間距離Ｙ１だけ離
れ、且つオイルパン２３と排気ガスセンサ３１との間は
所定寸法Ｚ１だけ離れている。従って、走行風は白抜き
矢印の如くオイルパン２３と排気管１７との間から排気
ガスセンサ３１の本体部３１ｂを冷却する。本体部３１
ｂに走行風が直接当るので、本体部３１ｂを効率良く冷
却することができる。Next, the thermal environment of the exhaust gas sensor 31 will be described. The exhaust gas of the engine 7 passes through the front exhaust pipes 17b to 17e as indicated by the thick arrows, merges, contacts the element 31a of the exhaust gas sensor 31, detects the components, and is discharged to the atmosphere. At this time, the heat of the exhaust gas is transmitted to the main body 31b of the exhaust gas sensor 31. Incidentally, the oil pan 23 and the exhaust pipe 17 are separated by a separation distance Y1, and the oil pan 23 and the exhaust gas sensor 31 are separated by a predetermined dimension Z1. Therefore, the traveling wind cools the main body 31b of the exhaust gas sensor 31 from between the oil pan 23 and the exhaust pipe 17 as indicated by the white arrow. Main unit 31
Since the traveling wind directly hits b, the main body 31b can be efficiently cooled.

【００１７】図５は本発明に係る排気ガスセンサ配置構
造の第２作用説明図であり、飛び石の挙動の一例、及び
走行風の流れを示す。前輪６によって巻上げられた飛び
石Ｓ５は、一番高く飛んだ石であり、オイルパン２３の
前面に当り道路に落下する。飛び石Ｓ６は、車体に当ら
ない場合の石である。また、隣の自動二輪車等で跳ね上
げた飛び石Ｓ７，Ｓ８，Ｓ９が図示のように飛んでくる
ことがある。飛び石Ｓ７は、オイルパン２３の左側面２
３ｄに当る。このように、オイルパン２３で排気ガスセ
ンサ３１を保護することができる。FIG. 5 is an explanatory view of a second operation of the exhaust gas sensor arrangement structure according to the present invention, showing an example of the behavior of a stepping stone and the flow of traveling wind. The stepping stone S5 wound by the front wheel 6 hits the front of the oil pan 23 and falls on the road. The stepping stone S6 is a stone that does not hit the vehicle body. Stepping stones S7, S8, and S9 jumped up by an adjacent motorcycle or the like may fly as shown in the figure. Stepping stone S7 is located on the left side 2 of oil pan 23.
It corresponds to 3d. Thus, the exhaust gas sensor 31 can be protected by the oil pan 23.

【００１８】ガスセンサ防護エリアδは、石の飛来が最
も少ない範囲であり、この範囲内に排気ガスセンサ３１
を配置したので、飛び石Ｓ８，Ｓ９は、排気ガスセンサ
３１に当り難い。また、前輪６が跳ね上げて間接的に後
方に飛んで来る石も当り難い。排気ガスセンサをオイル
パンなどの下部突起部の後面から所定寸法後方に離れ、
且つガスセンサ防護エリアδ内の位置にて排気管の上面
に縦向きに取付けることで、飛び石から排気ガスセンサ
を良好に保護することができる。The gas sensor protection area δ is a range in which stones fly least, and the exhaust gas sensor 31 falls within this range.
Are arranged, the stepping stones S8 and S9 hardly hit the exhaust gas sensor 31. In addition, it is difficult for the front wheel 6 to jump up and the stones indirectly flying backward. Move the exhaust gas sensor away from the rear surface of the lower projection, such as an oil pan, by a specified distance to the rear,
In addition, by vertically mounting the exhaust gas sensor on the upper surface of the exhaust pipe at a position within the gas sensor protection area δ, the exhaust gas sensor can be favorably protected from flying stones.

【００１９】一方、走行風は、白抜き矢印の如く前部排
気管１７ｂ〜１７ｅの間を通過し、左右に渡りオイルパ
ン２３の下を通る。左右から大量の風が入り込むので、
高温な前部排気管１７ｂ〜１７ｅの後方であっても所定
温度の走行風を得ることができる。風が排気ガスセンサ
３１に直接当り、本体部３１ｂを十分に冷却するので、
本体部３１ｂ内の電気信号用のケーブルなど耐熱性の低
い部品に影響を及ぼす心配はない。排気ガスセンサを下
部突起部の後面から隙間をもたせ、且つ下部突起部の下
面から隙間をもたせた位置に配置したので、この隙間が
空気の通路となり、十分な量の空気で排気ガスセンサを
冷却することができる。On the other hand, the traveling wind passes between the front exhaust pipes 17b to 17e as indicated by white arrows, and passes under the oil pan 23 from side to side. As a large amount of wind enters from the left and right,
A traveling wind at a predetermined temperature can be obtained even behind the high-temperature front exhaust pipes 17b to 17e. Since the wind directly hits the exhaust gas sensor 31 and sufficiently cools the main body 31b,
There is no fear of affecting parts having low heat resistance such as an electric signal cable in the main body 31b. Since the exhaust gas sensor is provided at a position where a gap is provided from the rear surface of the lower protrusion and a space is provided from the lower surface of the lower protrusion, the space serves as an air passage, and the exhaust gas sensor is cooled with a sufficient amount of air. Can be.

【００２０】[0020]

【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では、排気ガスセンサをオイルパンなど
の下部突起部の後面から所定寸法後方に離れた位置にて
排気管の上面に縦向きに取付ける。下部突起部および排
気管が飛び石から排気ガスセンサを守るので、保護カバ
ーを省くことができる。排気ガスセンサを下部突起部の
後面から隙間をもたせて設けたので、下部突起部に沿っ
て後方へ流れる飛び石が、この隙間を通過して落下する
こととなり、排気ガスセンサに達する心配はない。ま
た、保護カバーがないので、点検の際、排気ガスセンサ
を簡単に取外すことができる。更に、排気ガスセンサを
下部突起部の後面から隙間をもたせた位置にしたので、
この隙間が空気の通路となり、十分の量の空気で排気ガ
スセンサを冷却することができる。従って、本発明によ
れば、従来の保護カバーを必要としないので、設計・生
産コストの削減を図ることができるとともに冷却効率の
向上を図ることができる。According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect, the exhaust gas sensor is vertically mounted on the upper surface of the exhaust pipe at a position away from the rear surface of the lower protrusion such as an oil pan by a predetermined distance rearward. Since the lower projection and the exhaust pipe protect the exhaust gas sensor from flying stones, the protective cover can be omitted. Since the exhaust gas sensor is provided with a gap from the rear surface of the lower projection, the stepping stone that flows backward along the lower projection passes through the gap and falls, so there is no fear of reaching the exhaust gas sensor. Also, since there is no protective cover, the exhaust gas sensor can be easily removed at the time of inspection. Furthermore, since the exhaust gas sensor is located at a position with a gap from the rear surface of the lower projection,
The gap serves as an air passage, and the exhaust gas sensor can be cooled with a sufficient amount of air. Therefore, according to the present invention, since a conventional protective cover is not required, design and production costs can be reduced and cooling efficiency can be improved.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係る自動二輪車の側面図FIG. 1 is a side view of a motorcycle according to the present invention.

【図２】本発明に係る排気ガスセンサ配置構造の要部拡
大図FIG. 2 is an enlarged view of a main part of an exhaust gas sensor arrangement structure according to the present invention.

【図３】図２の３−３線断面図FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

【図４】本発明に係る排気ガスセンサ配置構造の第１作
用説明図FIG. 4 is a diagram illustrating a first operation of the exhaust gas sensor arrangement structure according to the present invention.

【図５】本発明に係る排気ガスセンサ配置構造の第２作
用説明図FIG. 5 is a diagram illustrating a second operation of the exhaust gas sensor arrangement structure according to the present invention.

【符号の説明】[Explanation of symbols]

１…自動二輪車、２…車体フレーム、６…前輪、７…エ
ンジン、１２…後輪、１７…排気管、１７ａ…上面、１
７ｆ…集合管、２３…オイルパン、２３ａ…後面、２３
ｂ…下面、３２…センサ取付け部、Ｚ１…所定寸法、Ｙ
１…離間距離。DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Body frame, 6 ... Front wheel, 7 ... Engine, 12 ... Rear wheel, 17 ... Exhaust pipe, 17a ... Top surface, 1
7f: collecting pipe, 23: oil pan, 23a: rear face, 23
b: lower surface, 32: sensor mounting part, Z1: predetermined dimensions, Y
1: Separation distance.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 オイルパンなどの下部突起部を備えたエ
ンジンを前後輪間に配置し、このエンジンから前記下部
突起部の下方を経て車体後方へ排気管を延ばし、この排
気管に排気ガスセンサを配置した自動二輪車において、 前記排気ガスセンサを、下部突起部の後面から所定寸法
後方に離れた位置にて排気管の上面に設けたセンサ取付
け部に、縦向きに取付けたことを特徴とする自動二輪車
の排気ガスセンサ配置構造。An engine having a lower projection such as an oil pan is disposed between front and rear wheels, and an exhaust pipe extends from the engine to a rear side of a vehicle body below the lower projection, and an exhaust gas sensor is attached to the exhaust pipe. In the motorcycle, the motorcycle is characterized in that the exhaust gas sensor is mounted vertically on a sensor mounting portion provided on an upper surface of an exhaust pipe at a position away from a rear surface of a lower projection by a predetermined distance rearward. Exhaust gas sensor arrangement structure.
JP14950998A 1998-05-29 1998-05-29 Exhaust gas sensor arrangement structure for motorcycles Expired - Fee Related JP4057145B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14950998A JP4057145B2 (en) 1998-05-29 1998-05-29 Exhaust gas sensor arrangement structure for motorcycles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14950998A JP4057145B2 (en) 1998-05-29 1998-05-29 Exhaust gas sensor arrangement structure for motorcycles

Publications (2)

Publication Number Publication Date
JPH11343895A true JPH11343895A (en) 1999-12-14
JP4057145B2 JP4057145B2 (en) 2008-03-05

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ID=15476705

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP4057145B2 (en)

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US7895832B2 (en) 2007-06-28 2011-03-01 Harley-Davidson Motor Company Group, Inc. Performance exhaust system
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US7610748B2 (en) 2004-09-30 2009-11-03 Honda Motor Co., Ltd. Mounting structure for an air-fuel ratio sensor in a motorcycle, and exhaust subassembly including same
EP1643096A1 (en) * 2004-09-30 2006-04-05 HONDA MOTOR CO., Ltd. Mounting structure for air-fuel ratio sensor in motercycle
EP1643108A1 (en) * 2004-09-30 2006-04-05 HONDA MOTOR CO., Ltd. Mounting structure of air-fuel sensor in motorcycle
US7562592B2 (en) 2004-09-30 2009-07-21 Honda Motor Co., Ltd. Mounting structure for an air-fuel ratio sensor in a motorcycle, and exhaust subassembly including same
JP2006250129A (en) * 2005-03-14 2006-09-21 Honda Motor Co Ltd Engine exhaust system
JP2006307693A (en) * 2005-04-27 2006-11-09 Suzuki Motor Corp Exhaust device for motorcycle
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US7743867B2 (en) 2006-09-05 2010-06-29 Yamaha Hatsudoki Kabushiki Kaisha Motorcycle
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US7895832B2 (en) 2007-06-28 2011-03-01 Harley-Davidson Motor Company Group, Inc. Performance exhaust system
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JP2016183652A (en) * 2015-03-26 2016-10-20 本田技研工業株式会社 Motor cycle
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