JP2005207231A - Exhaust gas sensor mounting structure of internal combustion engine - Google Patents

Exhaust gas sensor mounting structure of internal combustion engine Download PDF

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JP2005207231A
JP2005207231A JP2004011199A JP2004011199A JP2005207231A JP 2005207231 A JP2005207231 A JP 2005207231A JP 2004011199 A JP2004011199 A JP 2004011199A JP 2004011199 A JP2004011199 A JP 2004011199A JP 2005207231 A JP2005207231 A JP 2005207231A
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exhaust gas
exhaust
gas sensor
internal combustion
combustion engine
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JP4293916B2 (en
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Yoshitaka Nukada
芳隆 額田
Shuji Hirayama
周二 平山
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2004011199A priority Critical patent/JP4293916B2/en
Priority to TW093139788A priority patent/TW200528627A/en
Priority to KR1020050002150A priority patent/KR100635363B1/en
Priority to CNB2005100037647A priority patent/CN100343498C/en
Publication of JP2005207231A publication Critical patent/JP2005207231A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/34—Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for mounting an exhaust gas sensor around an internal combustion engine without requiring a large space and without being obstructed by a transmission member storage space and an exhaust pipe. <P>SOLUTION: The internal combustion engine 7 comprises an engine body having a cylinder 20 and a cylinder head 21. The openings of an intake port 61 and an exhaust port 62 are formed in the cylinder head on the side faces roughly symmetrical with respect to the axis of the cylinder. The transmission member storage space 84 driving a camshaft 75 is formed in the cylinder head on a side part where the intake and exhaust ports are not formed. An exhaust pipe 69 communicating with the exhaust port is bent, near the exhaust port, in an opposite direction to the transmission member storage space and extended, and the exhaust gas sensor 93 is passed from a cylinder head wall surface on the opposite side of the transmission member storage space to the exhaust port. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、内燃機関のシリンダヘッドに排気ガスセンサを取り付ける構造に関するものである。   The present invention relates to a structure for attaching an exhaust gas sensor to a cylinder head of an internal combustion engine.

従来の内燃機関においては、排気管の延伸方向と排気ガスセンサの取り付け位置とが、左右反対側となっていたので、内燃機関を自動二輪車等に搭載した時、排気ガスセンサは下方に露出した状態となり、路面からの飛石、跳ね水等に対し排気ガスセンサを保護する工夫が必要であった（例えば、特許文献１参照。）。   In a conventional internal combustion engine, the exhaust pipe extending direction and the exhaust gas sensor mounting position are opposite to each other. Therefore, when the internal combustion engine is mounted on a motorcycle or the like, the exhaust gas sensor is exposed downward. In addition, a device for protecting the exhaust gas sensor against flying stones, splash water, etc. from the road surface is required (for example, see Patent Document 1).

特公平３−３０７０２号公報。Japanese Patent Publication No. 3-30702.

本発明は、排気ガスセンサを配置するための広いスペースを必要とせず、また、伝動部材収納空間や排気管に邪魔されること無く、排気ガスセンサを内燃機関の周囲に取り付ける構造を提供する。   The present invention provides a structure for mounting an exhaust gas sensor around an internal combustion engine without requiring a large space for disposing an exhaust gas sensor and without being interrupted by a transmission member housing space or an exhaust pipe.

本発明は上記課題を解決したものであって、請求項１に記載の発明は、シリンダとシリンダヘッドとからなる機関本体を備え、上記シリンダヘッドの、上記シリンダ軸線に関してほぼ対称な側面に、それぞれ吸気ポートと排気ポートの開口を備え、上記シリンダヘッドの吸排気ポートの設けられていない側部にカムシャフトを駆動する伝動部材収納空間を備えた内燃機関において、
上記排気ポートに連なる排気管が、上記排気ポートの近傍では上記伝動部材収納空間とは反対の方向に湾曲して伸び、上記伝動部材収納空間とは反対側のシリンダヘッド壁面から上記排気ポートに貫通する排気ガスセンサが取付けられることを特徴とする内燃機関の排気ガスセンサ取り付け構造に関するものである。 The present invention solves the above-described problems, and the invention according to claim 1 includes an engine body including a cylinder and a cylinder head, and the cylinder head has substantially symmetrical side surfaces with respect to the cylinder axis. In an internal combustion engine that includes an opening of an intake port and an exhaust port, and a transmission member storage space that drives a camshaft on a side portion of the cylinder head where the intake and exhaust ports are not provided.
An exhaust pipe connected to the exhaust port is curved and extends in a direction opposite to the transmission member storage space in the vicinity of the exhaust port, and penetrates from the cylinder head wall surface on the opposite side to the transmission member storage space to the exhaust port. The present invention relates to an exhaust gas sensor mounting structure for an internal combustion engine, wherein an exhaust gas sensor is attached.

請求項２に記載の発明は、請求項１に記載の内燃機関の排気ガスセンサ取り付け構造において、シリンダおよびシリンダヘッドからなる機関本体がクランクケースから水平方向に延出し、排気管が機関本体の下方に配置され、上記排気ガスセンサの取り付け孔の中心線が外方に向けてやや上方へ傾斜し、上記排気ガスセンサが、その後端配線部をやや上方に指向して取り付けられることを特徴とするものである。   According to a second aspect of the present invention, in the exhaust gas sensor mounting structure for the internal combustion engine according to the first aspect, the engine body comprising the cylinder and the cylinder head extends horizontally from the crankcase, and the exhaust pipe is located below the engine body. The exhaust gas sensor is mounted with the center line of the mounting hole of the exhaust gas sensor inclined slightly upward toward the outside, and the exhaust gas sensor is mounted with the rear end wiring portion directed slightly upward. .

請求項３に記載の発明は、請求項２に記載の内燃機関の排気ガスセンサ取り付け構造において、上記排気ポートに２次空気導入口が設けられ、上記排気ガスセンサの排気ガス検出部が、上記２次空気導入口の排気ポート側開口の排気ポート下流側に位置することを特徴とするものである。   According to a third aspect of the present invention, in the exhaust gas sensor mounting structure for the internal combustion engine according to the second aspect, a secondary air introduction port is provided in the exhaust port, and the exhaust gas detection unit of the exhaust gas sensor is provided with the secondary gas sensor. It is located downstream of the exhaust port side opening of the air inlet port.

請求項４に記載の発明は、請求項２または請求項３に記載の内燃機関の排気ガスセンサ取り付け構造において、上記排気ポートに２次空気導入口が設けられ、その排気ポート側開口が、上記排気ガスセンサの排気ガス検出部に対向して設けられたことを特徴とするものである。   According to a fourth aspect of the present invention, in the exhaust gas sensor mounting structure for an internal combustion engine according to the second or third aspect, a secondary air introduction port is provided in the exhaust port, and the exhaust port side opening is provided in the exhaust port side. It is provided opposite to the exhaust gas detection part of the gas sensor.

請求項１の発明によって、伝動部材収納空間および排気管に邪魔されること無く、排気ガスセンサを内燃機関の周囲に取り付けることができる。   According to the first aspect of the present invention, the exhaust gas sensor can be attached around the internal combustion engine without being obstructed by the transmission member housing space and the exhaust pipe.

請求項２の発明によって、排気ガスセンサを排気ポートにコンパクトに配置しながら、下方位置となるセンサ配線の被水を低減することができる。   According to the second aspect of the present invention, it is possible to reduce the moisture of the sensor wiring at the lower position while arranging the exhaust gas sensor in the exhaust port in a compact manner.

請求項３の発明によって、２次空気を含む排気ガスの成分を、単一のセンサで測定でき、部品点数を削減することができる。   According to the invention of claim 3, the component of the exhaust gas including the secondary air can be measured with a single sensor, and the number of parts can be reduced.

請求項４の発明によって、２次空気導入口の排気ポート側開口と排気ガスセンサの排気ガス検出部とが互いに対向する側に設けてあるので、双方の取り付け位置を排気ポートの燃焼室側開口部に近づけることができ、排気ポートのレイアウトが容易になると共に、排気ガスの浄化性能の向上を図ることができる。   According to the invention of claim 4, since the exhaust port side opening of the secondary air introduction port and the exhaust gas detection part of the exhaust gas sensor are provided on the sides facing each other, the mounting position of both of them is the combustion chamber side opening part of the exhaust port. Thus, the exhaust port layout can be facilitated and the exhaust gas purification performance can be improved.

図１は本発明の排気ガスセンサ取り付け構造を有する内燃機関を搭載したスクータ型自動二輪車１の側面図である。この自動二輪車１では、車体フレーム２の前端にヘッドパイプ３が一体に形成され、ヘッドパイプ３にフロントフォーク４が左右に旋回自在に嵌装され、フロントフォーク４の下端に前車輪５が回転自在に取り付けられている。車体フレーム２の後部には、パワーユニット６が、上下揺動可能に取り付けられている。この揺動式パワーユニット６は、ロッカアーム型頭上弁式４ストロークサイクル単気筒の水冷式内燃機関７と動力伝達装置８と後車輪支持部９とが一体化されて構成されている。後車輪支持部９は後車輪10を具備している。また、車体フレーム２の後部とパワーユニット６の後部との間にリヤサスペンション11が介装されている。車体フレーム２の後方上部に物品収納部12が設けられ、この物品収納部12の上部開口を開閉自在に覆うシート13が設けられている。車体中央部のステップフロア14の下部に燃料タンク15が配設されている。車体フレーム２はボディカバー16で覆われている。   FIG. 1 is a side view of a scooter type motorcycle 1 equipped with an internal combustion engine having an exhaust gas sensor mounting structure of the present invention. In this motorcycle 1, a head pipe 3 is integrally formed at the front end of a body frame 2, a front fork 4 is fitted to the head pipe 3 so as to be able to turn left and right, and a front wheel 5 is rotatable at the lower end of the front fork 4. Is attached. A power unit 6 is attached to the rear portion of the vehicle body frame 2 so as to be swingable up and down. The rocking power unit 6 is configured by integrating a rocker arm type overhead valve type four-stroke cycle single-cylinder water-cooled internal combustion engine 7, a power transmission device 8, and a rear wheel support portion 9. The rear wheel support portion 9 includes a rear wheel 10. A rear suspension 11 is interposed between the rear part of the vehicle body frame 2 and the rear part of the power unit 6. An article storage section 12 is provided at the rear upper part of the body frame 2, and a seat 13 that covers the upper opening of the article storage section 12 so as to be openable and closable is provided. A fuel tank 15 is disposed below the step floor 14 at the center of the vehicle body. The body frame 2 is covered with a body cover 16.

図２は上記パワーユニット６の縦断面を側方から見た図、図３は同パワーユニット６のシリンダ軸線、クランク軸、プーリ軸、歯車軸を含む面に関する断面の展開図である。このパワーユニットの内燃機関７は、シリンダブロック20と、シリンダヘッド21と、シリンダヘッドカバー22と、クランクケース23とよりなり、略水平方向に指向したシリンダブロック20の前端にシリンダヘッド21が結合され、シリンダヘッド21の前端にシリンダヘッドカバー22が結合され、シリンダブロック20の後端にクランクケース23が結合されている。クランクケース23は左右のクランクケース23Ａ、23Ｂとからなっている。   FIG. 2 is a side view of the vertical cross section of the power unit 6, and FIG. 3 is an exploded view of the cross section of the power unit 6 with respect to the plane including the cylinder axis, crank shaft, pulley shaft, and gear shaft. The internal combustion engine 7 of this power unit includes a cylinder block 20, a cylinder head 21, a cylinder head cover 22, and a crankcase 23. The cylinder head 21 is coupled to the front end of the cylinder block 20 oriented in a substantially horizontal direction. A cylinder head cover 22 is coupled to the front end of the head 21, and a crankcase 23 is coupled to the rear end of the cylinder block 20. The crankcase 23 includes left and right crankcases 23A and 23B.

図２、図３において、シリンダブロック20に形成されたシリンダ孔24にピストン25が摺動可能に嵌装されるとともに、左右のクランクケース23Ａ、23Ｂに保持されたベアリング26、27に、クランク軸28が回転可能に枢支されている。ピストン25およびクランク軸28に、それぞれピストンピン29およびクランクピン30を介して、コネクティングロッド31の両端が回転可能に枢着されており、ピストン25が往復すると、クランク軸28が回転駆動されるようになっている。   2 and 3, a piston 25 is slidably fitted in a cylinder hole 24 formed in the cylinder block 20, and a crankshaft is mounted on bearings 26 and 27 held in the left and right crankcases 23 </ b> A and 23 </ b> B. 28 is pivotally supported. Both ends of the connecting rod 31 are rotatably attached to the piston 25 and the crankshaft 28 via the piston pin 29 and the crankpin 30, respectively. When the piston 25 reciprocates, the crankshaft 28 is driven to rotate. It has become.

パワーユニット６における動力伝達装置８は、Ｖベルト式無段変速機32と歯車減速機33とよりなり、動力伝達装置８の本体ケースは、右変速機ケース40、左変速機ケース41および後車輪支持ケース42から構成されている。右変速機ケース40は左クランクケース23Ａと一体に製作されている。左変速機ケース41は右変速機ケース40に結合され、後車輪支持ケース42は右変速機ケース40に結合されている。   The power transmission device 8 in the power unit 6 includes a V-belt continuously variable transmission 32 and a gear reducer 33. The main body case of the power transmission device 8 is a right transmission case 40, a left transmission case 41, and a rear wheel support. The case 42 is configured. The right transmission case 40 is manufactured integrally with the left crankcase 23A. The left transmission case 41 is coupled to the right transmission case 40, and the rear wheel support case 42 is coupled to the right transmission case 40.

Ｖベルト式無段変速機32の駆動軸は、クランク軸28そのものであり、これにＶベルト式無段変速機32の駆動プーリ43が設けてある。Ｖベルト式無段変速機32の従動軸44は、右変速機ケース40と後車輪支持ケース42とに回転自在に支持されており、この従動軸44に遠心クラッチ45を介してＶベルト式無段変速機32の従動プーリ46が設けてある。駆動プーリ43と従動プーリ46とに無端Ｖベルト47が架渡されている。Ｖベルト式無段変速機32では、クランク軸28が所定回転数を越えて回転すると、遠心クラッチ45が接続状態となり、従動軸44が回転を始める。クランク軸28の回転数がさらに増大すると、駆動プーリ43の遠心力応用機構によって、クランク軸28の回転数よりも従動軸44の回転数の方がが大きくなるようになっている。   The drive shaft of the V-belt type continuously variable transmission 32 is the crankshaft 28 itself, and the drive pulley 43 of the V-belt type continuously variable transmission 32 is provided thereon. The driven shaft 44 of the V-belt type continuously variable transmission 32 is rotatably supported by the right transmission case 40 and the rear wheel support case 42. A driven pulley 46 of the step transmission 32 is provided. An endless V-belt 47 is stretched between the driving pulley 43 and the driven pulley 46. In the V-belt type continuously variable transmission 32, when the crankshaft 28 rotates beyond a predetermined rotational speed, the centrifugal clutch 45 enters a connected state and the driven shaft 44 starts to rotate. When the rotational speed of the crankshaft 28 further increases, the rotational speed of the driven shaft 44 becomes larger than the rotational speed of the crankshaft 28 by the centrifugal force application mechanism of the drive pulley 43.

歯車減速機33は３本の回転軸に設けられた歯車群によって構成されている。第１の軸はは、右変速機ケース40と後車輪支持ケース42とに支持されているＶベルト式無段変速機32の従動軸44そのものであり、ピニオンギヤ48が形成されている。第２の軸は、右変速機ケース40と後車輪支持ケース42とに回転自在に支持されている中間軸49であり、上記従動軸のピニオンギヤ48に噛合うギヤ50が一体に嵌着されるとともに、それに隣接してピニオンギヤ51が形成されている。第３の軸は、右変速機ケース40と後車輪支持ケース42とに回転自在に支持されている後車輪軸52であり、上記中間軸のピニオンギヤ51に噛合うギヤ53が嵌着されている。後車輪軸52には、後車輪10が一体的に固定されている。この構成によって、従動軸44のトルクは、ピニオンギヤ48、ギヤ50、中間軸49、ピニオンギヤ51およびギヤ53を介して後車輪軸52に伝達されるので、後車輪軸52は従動軸44に対して大幅に減速されるようになっている。   The gear reducer 33 is constituted by a gear group provided on three rotating shafts. The first shaft is the driven shaft 44 itself of the V-belt type continuously variable transmission 32 supported by the right transmission case 40 and the rear wheel support case 42, and a pinion gear 48 is formed. The second shaft is an intermediate shaft 49 that is rotatably supported by the right transmission case 40 and the rear wheel support case 42, and a gear 50 that meshes with the pinion gear 48 of the driven shaft is integrally fitted. In addition, a pinion gear 51 is formed adjacent thereto. The third shaft is a rear wheel shaft 52 rotatably supported by the right transmission case 40 and the rear wheel support case 42, and a gear 53 that meshes with the pinion gear 51 of the intermediate shaft is fitted. . The rear wheel 10 is integrally fixed to the rear wheel shaft 52. With this configuration, the torque of the driven shaft 44 is transmitted to the rear wheel shaft 52 via the pinion gear 48, the gear 50, the intermediate shaft 49, the pinion gear 51, and the gear 53. It has come to decelerate significantly.

図４は内燃機関７の前部の拡大縦断面を左方から見た図である。図において、矢印Ｆは内燃機関の前方を表し、矢印Ｕｐは上方を表している。シリンダブロック20に形成されているシリンダ孔24の前端部に向き合うシリンダヘッド21の底面には燃焼室60が形成され、シリンダヘッド21の上部には吸気ポート61が形成され、シリンダヘッド21の下部には排気ポート62が形成されている。吸気ポート61の、燃焼室側開口61ａを開閉する吸気弁63と、排気ポート62の燃焼室側開口62ａを開閉する排気弁64とが、シリンダヘッド21にそれぞれ摺動自在に嵌装されている。   FIG. 4 is an enlarged longitudinal section of the front portion of the internal combustion engine 7 as viewed from the left. In the figure, arrow F represents the front of the internal combustion engine, and arrow Up represents the upper side. A combustion chamber 60 is formed on the bottom surface of the cylinder head 21 facing the front end portion of the cylinder hole 24 formed in the cylinder block 20, and an intake port 61 is formed on the top of the cylinder head 21. An exhaust port 62 is formed. An intake valve 63 for opening and closing the combustion chamber side opening 61a of the intake port 61 and an exhaust valve 64 for opening and closing the combustion chamber side opening 62a of the exhaust port 62 are slidably fitted to the cylinder head 21, respectively. .

吸気ポート61の外側開口61ｂには吸気管65の下流端が接続されている。この吸気管65には、上流側から順に、エアクリーナ66（図２）、スロットルバルブ67、および燃料噴射弁68が接続されている。排気ポート62の外側開口62ｂには排気管69の上流端が接続され、排気管69の下流端はマフラ70（図２、図３）に接続されている。さらにまた、バルブスプリング71により開弁方向に付勢されている上記吸気弁63および排気弁64（図４）は、シリンダヘッド21とシリンダヘッドカバー22とで形成される動弁室72内に配置された動弁装置73により開閉駆動されるようになっている。   The downstream end of the intake pipe 65 is connected to the outer opening 61 b of the intake port 61. An air cleaner 66 (FIG. 2), a throttle valve 67, and a fuel injection valve 68 are connected to the intake pipe 65 in order from the upstream side. An upstream end of the exhaust pipe 69 is connected to the outer opening 62b of the exhaust port 62, and a downstream end of the exhaust pipe 69 is connected to the muffler 70 (FIGS. 2 and 3). Furthermore, the intake valve 63 and the exhaust valve 64 (FIG. 4) urged in the valve opening direction by the valve spring 71 are disposed in a valve operating chamber 72 formed by the cylinder head 21 and the cylinder head cover 22. The valve operating device 73 is opened and closed.

図５は内燃機関７の前部の拡大水平断面図である。図において、矢印Ｆは内燃機関の前方、矢印Ｒは右方を表している。図４、図５において、吸気弁63および排気弁64により挟まれたＶ字状空間（図４）内に位置して、左右１対のベアリング74を介して左右水平方向に指向した１本のカム軸75（図５）が回転自在に枢支されている。このカム軸75の右側と左側とには吸気カム76と排気カム77とが一体に形成されている。図４に示すように、カム軸75より前方でかつ上方に位置してシリンダヘッド21に吸気ロッカ軸78が軸架され、吸気ロッカ軸78の下方に位置してシリンダヘッド21に排気ロッカ軸79が軸架され、この吸気ロッカ軸78および排気ロッカ軸79にそれぞれ吸気ロッカアーム80および排気ロッカアーム81が揺動自在に枢支されている。この吸気ロッカアーム80および排気ロッカアーム81の一端に摺動部80ａ、81ａが設けられ、吸気ロッカアーム80および排気ロッカアーム81の他端には、吸気弁63および排気弁64のステムの頂端に当接する当接部80ｂ、81ｂが設けてある。   FIG. 5 is an enlarged horizontal sectional view of the front portion of the internal combustion engine 7. In the figure, arrow F represents the front of the internal combustion engine, and arrow R represents the right side. 4 and 5, a single piece is positioned in the V-shaped space (FIG. 4) sandwiched between the intake valve 63 and the exhaust valve 64 and oriented horizontally in the horizontal direction via a pair of left and right bearings 74. A cam shaft 75 (FIG. 5) is pivotally supported. An intake cam 76 and an exhaust cam 77 are integrally formed on the right and left sides of the cam shaft 75. As shown in FIG. 4, an intake rocker shaft 78 is mounted on the cylinder head 21 in front of and above the cam shaft 75, and an exhaust rocker shaft 79 is mounted on the cylinder head 21 below the intake rocker shaft 78. And the intake rocker shaft 78 and the exhaust rocker shaft 79 are pivotally supported by an intake rocker arm 80 and an exhaust rocker arm 81, respectively. Sliding portions 80a and 81a are provided at one end of the intake rocker arm 80 and the exhaust rocker arm 81, and the other end of the intake rocker arm 80 and the exhaust rocker arm 81 is in contact with the top ends of the stems of the intake valve 63 and the exhaust valve 64. Portions 80b and 81b are provided.

カム軸75の左端部には、ドリブンスプロケット82（図５、図３）が一体的に設けられている。クランク軸28の左側クランクウエブ28ａと前述のドライブプーリ43の間には、上記ドリブンスプロケット82の半分の歯数を持つドライブスプロケット83（図３）が一体的に嵌着されている。シリンダブロック20とシリンダヘッド21の左側部に、上記ドライブスプロケット83とドリブンスプロケット82とをつなぐ伝動部材収納空間84が設けられ、この空間の中において、上記ドライブスプロケット83とドリブンスプロケット82に無端チェン85が架渡されている。以上が動弁装置73の構成である。クランク軸28が回転すると、カム軸75が半分の回転数で回転駆動され、所定のタイミングで吸気カム76および排気カム77により、吸気弁63および排気弁64が開閉される。   A driven sprocket 82 (FIGS. 5 and 3) is integrally provided at the left end of the cam shaft 75. A drive sprocket 83 (FIG. 3) having half the number of teeth of the driven sprocket 82 is integrally fitted between the left crank web 28a of the crankshaft 28 and the drive pulley 43 described above. A transmission member storage space 84 for connecting the drive sprocket 83 and the driven sprocket 82 is provided on the left side of the cylinder block 20 and the cylinder head 21, and an endless chain 85 is provided in the space between the drive sprocket 83 and the driven sprocket 82. Has been crossed. The above is the configuration of the valve gear 73. When the crankshaft 28 rotates, the camshaft 75 is driven to rotate at half the rotational speed, and the intake valve 63 and the exhaust valve 64 are opened and closed by the intake cam 76 and the exhaust cam 77 at a predetermined timing.

図６はシリンダヘッドの後端部を前方へ向かって見た図（図５のＶＩ−ＶＩ断面矢視図）である。図において、矢印Ｕｐは内燃機関の上方、矢印Ｒは右方を表している。図６には、シリンダブロック20に対するシリンダヘッド21の当接面21ａが点々で示してある.燃焼室60の中に吸気弁63と排気弁64が見える。シリンダヘッド21の左側の伝動部材収納空間84には、カム軸75、ドリブンスプロケット82、および無端チェン85があり、断面で示してある。   FIG. 6 is a view of the rear end portion of the cylinder head as viewed from the front (VI-VI cross-sectional arrow view of FIG. 5). In the figure, the arrow Up represents the upper side of the internal combustion engine, and the arrow R represents the right side. 6, the contact surface 21a of the cylinder head 21 with respect to the cylinder block 20 is indicated by dots. In the combustion chamber 60, the intake valve 63 and the exhaust valve 64 can be seen. In the transmission member storage space 84 on the left side of the cylinder head 21, there are a camshaft 75, a driven sprocket 82, and an endless chain 85, which are shown in cross section.

図５、図６において、シリンダヘッドの右側、即ち伝動部材収納空間84の反対側に、点火プラグ90が、その外端部を斜め前方へ向け（図５）、先端の電極90ａが燃焼室60に臨むように、シリンダヘッド21のネジ孔91に螺着されている。   5 and 6, on the right side of the cylinder head, that is, on the opposite side of the transmission member housing space 84, the spark plug 90 has its outer end directed obliquely forward (FIG. 5), and the electrode 90a at the tip is the combustion chamber 60. Is screwed into the screw hole 91 of the cylinder head 21.

図４、図５、および図６において、シリンダヘッド21の下部に、排気ポート62の外側開口62ｂがあり、その中心線Ｃは、鉛直面Ｖに対して約１２度ほど右方へ傾いている（図６の角α）。排気ポート62の外側開口62ｂに排気管69が接続されている。排気管69は排気ポート62の外側開口62ｂから下方へ若干伸び（図４、図６）、すぐ右方、即ち伝動部材収納空間84の反対側へ湾曲（図６）すると共に斜め後方へ伸び（図５）、その後、後方へ湾曲して（図４、図５）、マフラ70に達している（図３）。   4, 5, and 6, there is an outer opening 62 b of the exhaust port 62 at the bottom of the cylinder head 21, and its center line C is inclined to the right by about 12 degrees with respect to the vertical plane V. (An angle α in FIG. 6). An exhaust pipe 69 is connected to the outer opening 62 b of the exhaust port 62. The exhaust pipe 69 slightly extends downward from the outer opening 62b of the exhaust port 62 (FIGS. 4 and 6), curves rightward, that is, to the opposite side of the transmission member storage space 84 (FIG. 6), and extends obliquely rearward ( 5) and then curved backward (FIGS. 4 and 5) to reach the muffler 70 (FIG. 3).

図７は、排気ポート外側開口62ｂの周辺を、同開口の中心線の方向に沿って下から見た図（図６のＶＩＩ−ＶＩＩ矢視図）である。図５、図６、および図７において、シリンダヘッド21下部の上記排気ポート外側開口62ｂの右側、即ち伝動部材収納空間84の反対側に、排気ガスセンサ取り付け孔92が側方から穿設されている。この排気ガスセンサ取り付け孔92は、平面図（図５）では、ほぼシリンダ軸線に直交し、シリンダヘッドを後方から見ると（図６）、排気ポート62の外側開口62ｂの中心線Ｃに対してほぼ直角方向に穿設されている。即ち、排気ガスセンサ取り付け孔92の中心線Ｄは右方へ向き、やや上方へ傾いている。排気ガスセンサ93は、上記排気ガスセンサ取り付け孔92に、その先端の排気ガス検出部93ａが排気ポート62に臨み、外端がやや上方に傾く姿勢で装着されている。排気ガスセンサ93の外部露出部は、ほぼ排気管69の上方に位置している。したがって、強度の大きい排気管69が下方にあるので、排気ガスセンサ93は、路面からの飛石、跳ね水等の異物の当接や、被水に関して、排気管69によって保護されているといえる。   FIG. 7 is a view of the periphery of the exhaust port outer opening 62b as viewed from below along the direction of the center line of the opening (viewed along arrow VII-VII in FIG. 6). 5, 6, and 7, an exhaust gas sensor mounting hole 92 is formed from the side on the right side of the exhaust port outer opening 62 b below the cylinder head 21, that is, on the opposite side of the transmission member storage space 84. . In the plan view (FIG. 5), the exhaust gas sensor mounting hole 92 is substantially orthogonal to the cylinder axis. When the cylinder head is viewed from the rear (FIG. 6), the exhaust gas sensor mounting hole 92 is substantially with respect to the center line C of the outer opening 62b of the exhaust port 62. It is drilled in a perpendicular direction. That is, the center line D of the exhaust gas sensor mounting hole 92 is directed rightward and slightly inclined upward. The exhaust gas sensor 93 is mounted in the exhaust gas sensor mounting hole 92 so that the exhaust gas detection portion 93a at the tip of the exhaust gas sensor 93 faces the exhaust port 62 and the outer end is inclined slightly upward. The externally exposed portion of the exhaust gas sensor 93 is located substantially above the exhaust pipe 69. Therefore, since the exhaust pipe 69 having a high strength is located below, it can be said that the exhaust gas sensor 93 is protected by the exhaust pipe 69 with respect to contact of foreign matters such as stepping stones and splash water from the road surface and moisture.

図６、図７において、上記排気ポート62の左側に、シリンダヘッド21の左側下部から斜め上方に向かって、排気ポート62の、上記排気ガス検出部93ａの上流側に貫通する２次空気導入口94が設けてある。上記排気ガスセンサの取り付け孔の排気ポート側開口92ａに設けてある排気ガスセンサの排気ガス検出部93ａは、上記２次空気導入口の排気ポート側開口94ａの排気ポート下流側に位置している。上記２次空気導入口の排気ポート側開口94ａは、上記排気ガスセンサの排気ガス検出部93ａに対向して設けられている。この２次空気導入口94は排気管69に新鮮な空気を送って排気ガス中に含まれる有害な炭化水素ＨＣと一酸化炭素ＣＯを燃やし、無害な水蒸気Ｈ2Ｏと二酸化炭素ＣＯ2とにするためのものである。 6 and 7, on the left side of the exhaust port 62, a secondary air introduction port penetrating from the lower left side of the cylinder head 21 obliquely upward to the upstream side of the exhaust gas detection portion 93a of the exhaust port 62. 94 is provided. An exhaust gas detection portion 93a of the exhaust gas sensor provided in the exhaust port side opening 92a of the mounting hole of the exhaust gas sensor is located on the downstream side of the exhaust port of the exhaust port side opening 94a of the secondary air introduction port. The exhaust port side opening 94a of the secondary air introduction port is provided to face the exhaust gas detection portion 93a of the exhaust gas sensor. The secondary air inlet 94 sends fresh air to the exhaust pipe 69 to burn harmful hydrocarbons HC and carbon monoxide CO contained in the exhaust gas, and to harmless water vapor H 2 O and carbon dioxide CO 2 . Is to do.

本実施形態の排気ガスセンサ93は、排気ガスと新鮮な２次空気との混合気体の酸素濃度を測定するものである。この酸素濃度測定値は、燃料噴射弁68における燃料噴射量を制御して、出来るだけクリーンな排気ガスを排出するよう、電気式空燃比制御装置（図示なし）へフィードバックされるものである。   The exhaust gas sensor 93 of the present embodiment measures the oxygen concentration of a mixed gas of exhaust gas and fresh secondary air. This measured oxygen concentration value is fed back to an electric air-fuel ratio control device (not shown) so as to control the fuel injection amount in the fuel injection valve 68 and discharge exhaust gas as clean as possible.

図１において、内燃機関７の、図では向こう側の下部に、排気ガスセンサ93が取り付けられている。排気ガスセンサ93の外端から電気コードが伸び、上記電気式空燃比制御装置につながっている。図１において、線Ｇは地面を表し、線Ｗは前車輪５の外周と燃料タンク15の下端部との共通接線である。一般に降雨時の走行において、地面に降りかかった雨水は前車輪５の外周接線方向に沿って、水滴となって、周囲へ跳ね飛ばされる。跳ね飛ばされた水滴の内、上記線Ｗより上方へ跳ね飛ばされた水滴は、燃料タンク15に衝突して地面へ落下する。上記線Ｗより下方へ跳ね飛ばされた水滴は、動力伝達装置８の下部を濡らして地面へ落下する。本実施形態の排気ガスセンサ93は上記線Ｗより上方、かつ燃料タンク15の後方に位置しているので、前車輪５による跳ね水は燃料タンク15にさえぎられて、電気コードに届かない。したがって、フィードバック制御を阻害されないので、正確な燃料噴射量制御が行われる。   In FIG. 1, an exhaust gas sensor 93 is attached to the lower part of the internal combustion engine 7 on the far side in the figure. An electric cord extends from the outer end of the exhaust gas sensor 93 and is connected to the electric air-fuel ratio control device. In FIG. 1, the line G represents the ground, and the line W is a common tangent line between the outer periphery of the front wheel 5 and the lower end of the fuel tank 15. In general, during running during rain, rainwater that has fallen on the ground becomes water droplets along the outer circumferential tangential direction of the front wheel 5 and is splashed away. Among the splashed water droplets, the water droplets splashed upward from the line W collide with the fuel tank 15 and fall to the ground. The water droplet splashed downward from the line W wets the lower part of the power transmission device 8 and falls to the ground. Since the exhaust gas sensor 93 of the present embodiment is located above the line W and behind the fuel tank 15, splash water from the front wheel 5 is blocked by the fuel tank 15 and does not reach the electrical cord. Accordingly, since the feedback control is not hindered, accurate fuel injection amount control is performed.

以上に詳述したように、本実施形態の内燃機関においては、排気ポートに連なる排気管が、上記排気ポートの近傍では外方へ伸びるとすぐに伝動部材収納空間とは反対の方向に湾曲して伸び、伝動部材収納空間とは反対側のシリンダヘッド壁面から上記排気ポートに貫通する排気ガスセンサ取り付け孔が形成され、そこに排気ガスセンサが取り付けられるので、伝動部材収納空間および排気管に邪魔されること無く、排気ガスセンサを内燃機関の周囲に取り付けることができる。   As described above in detail, in the internal combustion engine of the present embodiment, as soon as the exhaust pipe connected to the exhaust port extends outward in the vicinity of the exhaust port, it bends in the direction opposite to the transmission member housing space. An exhaust gas sensor mounting hole penetrating from the wall surface of the cylinder head opposite to the transmission member storage space to the exhaust port is formed, and the exhaust gas sensor is mounted there, so that it is obstructed by the transmission member storage space and the exhaust pipe Without this, the exhaust gas sensor can be mounted around the internal combustion engine.

また、排気管が機関本体の下方において、同排気管の上方のシリンダヘッド壁面から排気ポートに連通する排気ガスセンサ取り付け孔が設けられ、上記排気ガスセンサが、その後端をやや上方に指向して取り付けられるので、排気ガスセンサを排気ポートにコンパクトに配置出来る。また内燃機関の下方位置に設置されるが、排気ガスセンサは、排気管の上方に設けられるので、センサの電気配線の地面からの跳ね水による被水を低減することができる。また排気ガスセンサは、燃料タンクの後部のやや上方に取りつけられるので、前車輪からの跳ね水の影響を免れることができる。   Also, an exhaust gas sensor mounting hole is provided below the engine body so as to communicate with the exhaust port from the cylinder head wall surface above the exhaust pipe, and the exhaust gas sensor is mounted with its rear end directed slightly upward. Therefore, the exhaust gas sensor can be arranged in a compact manner at the exhaust port. Although installed at a position below the internal combustion engine, since the exhaust gas sensor is provided above the exhaust pipe, it is possible to reduce water exposure due to splash water from the ground of the electrical wiring of the sensor. Further, since the exhaust gas sensor is mounted slightly above the rear part of the fuel tank, it is possible to avoid the influence of splash water from the front wheels.

さらに、排気ガスセンサ取り付け孔の排気ポート側開口に設けてある排気ガスセンサの排気ガス検出部は、上記２次空気導入口の排気ポート側開口の排気ポート下流側に位置しているので、２次空気を含む排気ガスの成分を、単一のセンサで測定でき、部品点数を削減することができ、効果的である。   Further, since the exhaust gas detection part of the exhaust gas sensor provided in the exhaust port side opening of the exhaust gas sensor mounting hole is located downstream of the exhaust port side opening of the secondary air introduction port, the secondary air The exhaust gas component containing can be measured with a single sensor, and the number of parts can be reduced, which is effective.

また、２次空気導入口の排気ポート側開口と排気ガスセンサの排気ガス検出部とが互いに対向する側に設けてあるので、双方の取り付け位置を排気ポートの燃焼室側開口部に近づけることができ、排気ポートのレイアウトが容易になると共に、排気ガスの浄化性能の向上を図ることができる。   Further, since the opening on the exhaust port side of the secondary air introduction port and the exhaust gas detection part of the exhaust gas sensor are provided on the sides facing each other, both mounting positions can be brought close to the opening on the combustion chamber side of the exhaust port. As a result, the layout of the exhaust port is facilitated, and the exhaust gas purification performance can be improved.

本発明の排気ガスセンサ取り付け構造を有する内燃機関を搭載したスクータ型自動二輪車１の側面図である。1 is a side view of a scooter type motorcycle 1 equipped with an internal combustion engine having an exhaust gas sensor mounting structure of the present invention. 上記パワーユニット６の縦断面を側方から見た図である。It is the figure which looked at the longitudinal section of the power unit 6 from the side. 上記パワーユニット６のシリンダ軸線、クランク軸、プーリ軸、歯車軸を含む面に関する断面の展開図である。FIG. 3 is a development view of a cross section of a plane including a cylinder axis, a crankshaft, a pulley shaft, and a gear shaft of the power unit 6. 内燃機関７の前部の拡大縦断面を左方から見た図である。FIG. 3 is an enlarged vertical cross section of a front portion of the internal combustion engine 7 as viewed from the left. 内燃機関７の前部の拡大水平断面図である。2 is an enlarged horizontal sectional view of a front portion of the internal combustion engine 7. FIG. シリンダヘッドの後端部を前方へ向かって見た図（図５のＶＩ−ＶＩ断面矢視図）である。It is the figure which looked at the rear-end part of the cylinder head toward the front (VI-VI sectional arrow view of FIG. 5). 排気ポート外側開口62ｂの周辺を、同開口の中心線の方向に沿って下から見た図（図６のＶＩＩ−ＶＩＩ矢視図）である。FIG. 7 is a diagram (viewed along arrow VII-VII in FIG. 6) of the periphery of the exhaust port outer opening 62 b as viewed from below along the direction of the center line of the opening.

符号の説明Explanation of symbols

１…スクータ型自動２輪車、２…車体フレーム、３…ヘッドパイプ、４…フロントフォーク、５…前車輪、６…パワーユニット、７…内燃機関、８…動力伝達装置、９…後車輪支持部、10…後車輪、11…リヤサスペンション、12…物品収納部、13…シート、14…ステップフロア、15…燃料タンク、16…ボディカバー、20…シリンダブロック、21…シリンダヘッド、21ａ…当接面、22…シリンダヘッドカバー、23…クランクケース、23Ａ…左クランクケース、23Ｂ…右クランクケース、24…シリンダ孔、25…ピストン、26…ベアリング、27…ベアリング、28…クランク軸、28ａ…左側クランクウエブ、29…ピストンピン、30…クランクピン、31…コネクティングロッド、32…Ｖベルト式無段変速機、33…歯車減速機、40…右変速機ケース、41…左変速機ケース、42…後車輪支持ケース、43…駆動プーリ、44…従動軸、45…遠心クラッチ、46…従動プーリ、47…無端Ｖベルト、48…ピニオンギヤ、49…中間軸、50…ギヤ、51…ピニオンギヤ、52…車軸、53…ギヤ、60…燃焼室、61…吸気ポート、61ａ…燃焼室側開口、61ｂ…外側開口、62…排気ポート、62ａ…燃焼室側開口、62ｂ…外側開口、63…吸気弁、64…排気弁、65…吸気管、66…エアクリーナ、67…スロットルバルブ、68…燃料噴射弁、69…排気管、70…マフラ、71…バルブスプリング、72…動弁室、73…動弁装置、74…ベアリング、75…カム軸、76…吸気カム、77…排気カム、78…吸気ロッカ軸、79…排気ロッカ軸、80…吸気ロッカアーム、80ａ…摺動部、80ｂ…当接部、81…排気ロッカアーム、81ａ…摺動部、81ｂ…当接部、82…ドリブンスプロケット、83…ドライブスプロケット、84…伝動部材収納空間、85…無端チェン、90…点火プラグ、90ａ…電極、91…点火プラグ取り付け用ねじ孔、92…排気ガスセンサ取り付け孔、92ａ…排気ガスセンサ取り付け孔の排気ポート側開口、93…排気ガスセンサ、93ａ…排気ガス検出部、94…２次空気導入口、94ａ…２次空気導入口の排気ポート側開口。
DESCRIPTION OF SYMBOLS 1 ... Scooter type motorcycle, 2 ... Body frame, 3 ... Head pipe, 4 ... Front fork, 5 ... Front wheel, 6 ... Power unit, 7 ... Internal combustion engine, 8 ... Power transmission device, 9 ... Rear wheel support part , 10 ... rear wheels, 11 ... rear suspension, 12 ... article storage, 13 ... seat, 14 ... step floor, 15 ... fuel tank, 16 ... body cover, 20 ... cylinder block, 21 ... cylinder head, 21a ... contact surface , 22 ... Cylinder head cover, 23 ... Crankcase, 23A ... Left crankcase, 23B ... Right crankcase, 24 ... Cylinder hole, 25 ... Piston, 26 ... Bearing, 27 ... Bearing, 28 ... Crankshaft, 28a ... Left crank web , 29 ... piston pin, 30 ... crank pin, 31 ... connecting rod, 32 ... V-belt continuously variable transmission, 33 ... gear reducer, 40 ... right transmission case, 41 ... left transmission case, 42 Rear wheel support case, 43 ... Driving pulley, 44 ... Driven shaft, 45 ... Centrifugal clutch, 46 ... Driven pulley, 47 ... Endless V-belt, 48 ... Pinion gear, 49 ... Intermediate shaft, 50 ... Gear, 51 ... Pinion gear, 52 ... Axle, 53 ... gear, 60 ... combustion chamber, 61 ... intake port, 61a ... combustion chamber side opening, 61b ... outside opening, 62 ... exhaust port, 62a ... combustion chamber side opening, 62b ... outside opening, 63 ... intake valve, 64 ... Exhaust valve, 65 ... Intake pipe, 66 ... Air cleaner, 67 ... Throttle valve, 68 ... Fuel injection valve, 69 ... Exhaust pipe, 70 ... Muffler, 71 ... Valve spring, 72 ... Valve chamber, 73 ... Valve device 74 ... Bearing, 75 ... Cam shaft, 76 ... Intake cam, 77 ... Exhaust cam, 78 ... Intake rocker shaft, 79 ... Exhaust rocker shaft, 80 ... Intake rocker arm, 80a ... Sliding part, 80b ... Abutting part, 81 ... exhaust rocker arm, 81a ... sliding part, 81b ... contact part, 82 ... driven sprocket, 83 ... drive sprocket 84 ... Transmission member storage space, 85 ... Endless chain, 90 ... Spark plug, 90a ... Electrode, 91 ... Screw hole for attaching spark plug, 92 ... Exhaust gas sensor attachment hole, 92a ... Exhaust gas sensor attachment hole on the exhaust port side 93 ... Exhaust gas sensor, 93a ... Exhaust gas detector, 94 ... Secondary air inlet, 94a ... Exhaust port side opening of the secondary air inlet.

Claims (4)

シリンダとシリンダヘッドとからなる機関本体を備え、上記シリンダヘッドの、上記シリンダ軸線に関してほぼ対称な側面に、それぞれ吸気ポートと排気ポートの開口を備え、上記シリンダヘッドの吸排気ポートの設けられていない側部にカムシャフトを駆動する伝動部材収納空間を備えた内燃機関において、
上記排気ポートに連なる排気管が、上記排気ポートの近傍では上記伝動部材収納空間とは反対の方向に湾曲して伸び、上記伝動部材収納空間とは反対側のシリンダヘッド壁面から上記排気ポートに貫通する排気ガスセンサが取付けられることを特徴とする内燃機関の排気ガスセンサ取り付け構造。 An engine main body comprising a cylinder and a cylinder head is provided, and the cylinder head is provided with openings of intake ports and exhaust ports on substantially symmetrical side surfaces with respect to the cylinder axis, and no intake and exhaust ports of the cylinder head are provided. In the internal combustion engine having a transmission member storage space for driving the camshaft on the side,
An exhaust pipe connected to the exhaust port is curved and extends in a direction opposite to the transmission member storage space in the vicinity of the exhaust port, and penetrates from the cylinder head wall surface on the opposite side to the transmission member storage space to the exhaust port. An exhaust gas sensor mounting structure for an internal combustion engine, wherein an exhaust gas sensor is attached. シリンダおよびシリンダヘッドからなる機関本体がクランクケースから水平方向に延出し、排気管が機関本体の下方に配置され、上記排気ガスセンサ取付孔の中心線が外方に向けてやや上方へ傾斜し、上記排気ガスセンサが、その後端配線部をやや上方に指向して取り付けられることを特徴とする請求項１に記載の内燃機関の排気ガスセンサ取り付け構造。 An engine body consisting of a cylinder and a cylinder head extends horizontally from the crankcase, an exhaust pipe is disposed below the engine body, and a center line of the exhaust gas sensor mounting hole is inclined slightly upward toward the outside. 2. The exhaust gas sensor mounting structure for an internal combustion engine according to claim 1, wherein the exhaust gas sensor is mounted with its rear end wiring portion oriented slightly upward. 上記排気ポートに２次空気導入口が設けられ、上記排気ガスセンサの排気ガス検出部が、上記２次空気導入口の排気ポート側開口の排気ポート下流側に位置することを特徴とする請求項２に記載の内燃機関の排気ガスセンサ取り付け構造。 The secondary air introduction port is provided in the exhaust port, and the exhaust gas detection portion of the exhaust gas sensor is located downstream of the exhaust port side opening of the secondary air introduction port. 2. An exhaust gas sensor mounting structure for an internal combustion engine according to 1. 上記排気ポートに２次空気導入口が設けられ、その排気ポート側開口が、上記排気ガスセンサの排気ガス検出部に対向して設けられたことを特徴とする請求項２または請求項３に記載の内燃機関の排気ガスセンサ取り付け構造。
The secondary air introduction port is provided in the exhaust port, and the exhaust port side opening is provided to face the exhaust gas detection part of the exhaust gas sensor. An exhaust gas sensor mounting structure for an internal combustion engine.
JP2004011199A 2004-01-19 2004-01-19 Exhaust gas sensor mounting structure for internal combustion engine Expired - Lifetime JP4293916B2 (en)

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JP2004011199A JP4293916B2 (en) 2004-01-19 2004-01-19 Exhaust gas sensor mounting structure for internal combustion engine
TW093139788A TW200528627A (en) 2004-01-19 2004-12-21 Exhaust gas sensor mounting structure of internal combustion engine
KR1020050002150A KR100635363B1 (en) 2004-01-19 2005-01-10 Exhaust sensor attachment structure of internal combustion engine
CNB2005100037647A CN100343498C (en) 2004-01-19 2005-01-11 Exhaust sensor installing structure of ic engine

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011096291A1 (en) * 2010-02-02 2011-08-11 スズキ株式会社 Structure for attaching exhaust gas sensor in motorcycle
CN103437871A (en) * 2013-08-20 2013-12-11 江门市大长江集团有限公司 Motorcycle exhaust pipe connecting piece and oxygen sensor mounting structure with same
JP2014058975A (en) * 2013-11-11 2014-04-03 Honda Motor Co Ltd Mounting structure of exhaust gas sensor of motorcycle

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
JP5083527B2 (en) * 2007-09-20 2012-11-28 スズキ株式会社 Motorcycle exhaust system
JP5510017B2 (en) * 2010-04-15 2014-06-04 いすゞ自動車株式会社 Exhaust sensor arrangement structure
TWI383093B (en) * 2010-07-13 2013-01-21 Sanyang Industry Co Ltd Configuration Structure of Oxygen Sensor for Internal Combustion Engine
MY188052A (en) * 2013-09-19 2021-11-15 Honda Motor Co Ltd Fixing structure for exhaust gas sensor of internal combustion engine

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US4553388A (en) * 1981-11-30 1985-11-19 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas purification apparatus for an internal combustion engine
JP4145423B2 (en) * 1999-05-28 2008-09-03 本田技研工業株式会社 Exhaust gas sensor device for motorcycles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011096291A1 (en) * 2010-02-02 2011-08-11 スズキ株式会社 Structure for attaching exhaust gas sensor in motorcycle
CN103437871A (en) * 2013-08-20 2013-12-11 江门市大长江集团有限公司 Motorcycle exhaust pipe connecting piece and oxygen sensor mounting structure with same
JP2014058975A (en) * 2013-11-11 2014-04-03 Honda Motor Co Ltd Mounting structure of exhaust gas sensor of motorcycle

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CN100343498C (en) 2007-10-17
TWI296669B (en) 2008-05-11

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