JP3225466B2 - Exhaust system for motorcycle - Google Patents
Exhaust system for motorcycleInfo
- Publication number
- JP3225466B2 JP3225466B2 JP03183892A JP3183892A JP3225466B2 JP 3225466 B2 JP3225466 B2 JP 3225466B2 JP 03183892 A JP03183892 A JP 03183892A JP 3183892 A JP3183892 A JP 3183892A JP 3225466 B2 JP3225466 B2 JP 3225466B2
- Authority
- JP
- Japan
- Prior art keywords
- silencer
- exhaust
- layer
- motorcycle
- expansion chamber
- 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.)
- Expired - Fee Related
Links
- 230000003584 silencer Effects 0.000 claims description 41
- 239000003054 catalyst Substances 0.000 claims description 23
- 239000000919 ceramic Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 5
- 210000002268 wool Anatomy 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000008646 thermal stress Effects 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 230000008602 contraction Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000011358 absorbing material Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001743 silencing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- F01N3/28—Construction of catalytic reactors
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
- F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
-
- 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
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、２サイクルエンジンの
排気管の下流に、膨張室からなる消音装置及び同心の触
媒装置を設け、更にサイレンサを接続した自動二輪車の
排気装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle exhaust system in which a silencer comprising an expansion chamber and a concentric catalyst device are provided downstream of an exhaust pipe of a two-cycle engine, and a silencer is connected.
【０００２】[0002]
【従来の技術】排気管の下流に膨張室を設け、その内部
に同心状に触媒装置と内管を連続して設け、該内管を排
気管の後端から突出させ、これにサイレンサを接続した
２サイクルエンジンの排気装置は従来知られている（例
えば特開平２−６１３１２号）。この形式の装置は、良
好な排気浄化作用を行うと共に出力低下が少ないという
利点をもつが、エンジンのスロットルを全開にした高
速、高負荷運転状態から急減速すると、エンジンの失火
により排出される生ガスの量が急増し、それが前記触媒
装置で反応してＣＯに変化する。一方、サイレンサ内
は、急減速により排気の流速が低下するうえ脈動が生じ
るため、テールパイプから外気を吸入し易くなり、吸入
した外気中のＯ2と前記の増大したＣＯがサイレンサ内
で反応し、該反応によってサイレンサ内に設けられる吸
音材が劣化するおそれがある。2. Description of the Related Art An expansion chamber is provided downstream of an exhaust pipe, and a catalyst device and an inner pipe are continuously provided concentrically inside the expansion chamber. The inner pipe is projected from the rear end of the exhaust pipe, and a silencer is connected thereto. The exhaust device of the two-stroke engine described above is conventionally known (for example, JP-A-2-61312). This type of device has the advantage that it performs a good exhaust purification action and has a small output reduction. The amount of gas spikes, which reacts in the catalytic device and changes to CO. On the other hand, in the silencer, the flow velocity of the exhaust gas decreases due to rapid deceleration and pulsation occurs, so that the outside air is easily sucked from the tail pipe, and O 2 in the sucked outside air reacts with the increased CO in the silencer. The reaction may cause the sound absorbing material provided in the silencer to deteriorate.
【０００３】[0003]
【発明が解決しようとする課題】したがって本発明は、
サイレンサ内でＣＯとＯ2が反応しサイレンサが劣化す
るのを防止することを課題とする。Accordingly, the present invention provides
It is an object to prevent degradation of the silencer due to reaction between CO and O 2 in the silencer.
【０００４】[0004]
【課題を解決するための手段】前記課題の解決手段は、
各請求項に記載のとおりであり、請求項１の手段は、２
サイクルエンジンの排気管の下流に膨張室を設け、該膨
張室内にハニカム型の触媒装置を配置する自動二輪車の
排気装置において、当該触媒装置から更に下流側に配置
するサイレンサ内の排気ガス温度を、エンジンを高負荷
から急減速し約５秒経過後に６００℃又はそれ以下に維
持することを特徴とする。この手段によれば、エンジン
が仮に高負荷からの急減速が生じても、サイレンサ内
は、ＣＯとＯ 2 の反応温度以下に保持される。したがっ
てＣＯが増大し、流速が遅くなっても反応が生じないで
放出されるから、サイレンサ内の吸音材が劣化するおそ
れがない。また、請求項２の手段は、請求項１におい
て、サイレンサ内の前記排気ガス温度の維持を、サイレ
ンサの外周部を被覆する防熱カバーの被覆範囲の調整に
より行なうことを特徴とする。この手段によれば、サイ
レンサ内の排気ガス温度が、防熱カバーの大きさ及び位
置で調整できる。請求項３の手段は、請求項１におい
て、前記ハニカム型の触媒装置の後端から伸びる内管
を、内面に吸音層をもつ円筒形のサイレンサに接続した
ことを特徴とする。この手段によれば、サイレンサの消
音効果は、内面の吸音層で向上される。請求項４の手段
は、請求項３において、前記内管に伸縮部を設け、温度
変化による熱応力の発生を防止する構造を備えることを
特徴とする。この手段によれば、内管の損傷が防止され
る。請求項５の手段は、請求項１又は３において、前記
サイレンサ内面に、セラミックファイバ層を外層とし、
耐食性の金属ウール層を内層として積層した吸音層を設
けたことを特徴とする。この手段によれば、金属ウール
層でセラミックファイバ層を保持し、セラミックファイ
バ層で騒音が防止される。Means for solving the above-mentioned problems are as follows.
It is as described in each claim, and the means of claim 1 is:
In a motorcycle exhaust system in which an expansion chamber is provided downstream of an exhaust pipe of a cycle engine and a honeycomb-type catalyst device is disposed in the expansion chamber, the expansion device is disposed further downstream from the catalyst device.
The engine is characterized in that the exhaust gas temperature in the silencer is maintained at 600 ° C. or less after about 5 seconds after the engine is rapidly decelerated from a high load. According to this means, the engine
However, even if sudden deceleration from a high load occurs,
Is kept below the reaction temperature of CO and O 2 . Accordingly
CO does not react even if the flow rate slows
The sound absorbing material in the silencer is likely to be
There is no. According to a second aspect of the present invention, in the first aspect, the exhaust gas temperature in the silencer is maintained by adjusting a covering range of a heat insulating cover covering an outer peripheral portion of the silencer. According to this means, the temperature of the exhaust gas in the silencer can be adjusted by the size and position of the heat shield. According to a third aspect of the present invention, in the first aspect, an inner pipe extending from a rear end of the honeycomb catalyst device is connected to a cylindrical silencer having a sound absorbing layer on an inner surface. According to this means, the silencing effect of the silencer is improved by the sound absorbing layer on the inner surface. A fourth aspect of the present invention is characterized in that, in the third aspect, a structure is provided in which the inner tube is provided with a telescopic portion to prevent generation of thermal stress due to a temperature change. According to this means, damage to the inner tube is prevented. The means according to claim 5 is the method according to claim 1 or 3, wherein a ceramic fiber layer is formed as an outer layer on the inner surface of the silencer,
A sound absorbing layer in which a corrosion-resistant metal wool layer is laminated as an inner layer is provided. According to this means, the ceramic fiber layer is held by the metal wool layer, and noise is prevented by the ceramic fiber layer.
【０００５】[0005]
【実施例】以下、図面を参照して本発明の実施例を説明
する。図１、図２において１は自動二輪車、２はそのフ
レーム、３は図外の操舵軸と前輪４を保持するヘッドパ
イプ、５はヘッドパイプ３から左右に伸びる主フレー
ム、６はシートレール、７はリヤフレーム、８はステー
である。主フレーム４から下方に伸びるピボットプレー
ト９には、スイングアーム１０がピボット１１で枢支さ
れ、その後端に後輪１２が取付けられ、スイングアーム
１０の中間部とシートレール６の間にリヤクッション１
３が介設される。そして、フレーム２の上方には燃料タ
ンク１４、エヤクリーナ１５、シート１６が取付けら
れ、主フレーム５の下方に２サイクルエンジン１７がス
テー１８、１９等を介して取付けられる。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, 1 is a motorcycle, 2 is its frame, 3 is a head pipe for holding a steering shaft and a front wheel 4 (not shown), 5 is a main frame extending left and right from the head pipe 3, 6 is a seat rail, 7 Is a rear frame, and 8 is a stay. A swing arm 10 is pivotally supported by a pivot 11 on a pivot plate 9 extending downward from the main frame 4, and a rear wheel 12 is attached to a rear end of the swing arm 10. A rear cushion 1 is provided between an intermediate portion of the swing arm 10 and the seat rail 6.
3 is interposed. A fuel tank 14, an air cleaner 15, and a seat 16 are attached above the frame 2, and a two-cycle engine 17 is attached below the main frame 5 via stays 18, 19 and the like.
【０００６】エンジン１７のクランクケース２０には気
化器２１が連結されて前記エヤクリーナ１５に接続さ
れ、シリンダ２２の前面には排気装置２３が接続され
る。図中２４はフロントカウル、２５はサイドカウル、
２６はシートカウル、２７はラジエタ、２８は伝動チェ
ーンである。[0006] A carburetor 21 is connected to a crankcase 20 of the engine 17 and connected to the air cleaner 15. An exhaust device 23 is connected to a front surface of the cylinder 22. In the figure, 24 is a front cowl, 25 is a side cowl,
26 is a seat cowl, 27 is a radiator, and 28 is a transmission chain.
【０００７】排気装置２３は、後向きに湾曲する排気管
３０、大径の膨張室３１、サイレンサ３２を備え、湾曲
部に第１の触媒装置３３を備える。該触媒装置３３は、
排気管３０に多数の***を設け、触媒を付着させた金属
線よりなるマット状のクロス坦体を***を有する部分の
外側に巻き付け、外面を管体で気密に覆ったもので、排
ガス中の未燃成分の一部を燃焼させるものである。The exhaust device 23 includes an exhaust pipe 30 that curves backward, a large-diameter expansion chamber 31, and a silencer 32, and a first catalyst device 33 in a curved portion. The catalyst device 33 is
A large number of small holes are provided in the exhaust pipe 30, a mat-shaped cross carrier made of a metal wire to which a catalyst is attached is wound around the outside of the portion having the small holes, and the outer surface is air-tightly covered with a tube. It burns some of the unburned components.
【０００８】膨張室３１は、大径部３１ａとその前後の
テーパ状の拡径部３１ｂ及び縮径部３１ｃを備え、大径
部３１ａは二重壁とされて壁間に吸音材３４が介装され
ている。また膨張室３１の内部には、第２の触媒装置３
５が前向きに設けられ、その後部に接続された内管３６
が縮径部３１ｃ内を貫通し、溶接部３７で気密に結合さ
れ、更に尾端に前記サイレンサ３２が接続されている。The expansion chamber 31 has a large-diameter portion 31a, a tapered enlarged-diameter portion 31b and a tapered-diameter portion 31c before and after the large-diameter portion 31a. The large-diameter portion 31a has a double wall, and a sound absorbing material 34 is interposed between the walls. Is equipped. Further, inside the expansion chamber 31, the second catalyst device 3 is provided.
5 is provided facing forward, and an inner pipe 36 connected to the rear thereof is provided.
Penetrates through the reduced diameter portion 31c, is hermetically connected by a welded portion 37, and is connected to the silencer 32 at the tail end.
【０００９】図３〜５に示す触媒装置３５において、３
８はハニカム型の触媒坦体であり、これは、触媒を付着
させた耐食金属の薄い波板と平板を交互に重ね、波板の
凹凸条と平行の一辺を中心にして巻き込んで無数の細い
通路を形成して筒板３８ａ内に収容したものである。こ
の触媒坦体３８の寸法は、エンジンの排気量が１２５〜
１５０ccの場合、図３で直径Ｄ1＝５１mm、長さＬ1＝７
５mmとされる。そして、該筒体３８ａの後端には前記内
管３６が溶接され、外周には金網を波形に変形させた緩
衝体３９が巻付けられ、更に二つ割りのカバー４０で覆
われ、ステー４１で大径部３１ａの内壁４２に連結さ
れ、大径部３１ａと略同心に保持される。内管３６の後
端に接続されるサイレンサ３２は、円筒形のケース４５
の内側に設けた複数組の隔壁４６と絞り管４７で消音室
４８、４９、５０…を形成し、後端にテールパイプ５１
を設けたものであり、ケースの寸法は、直径Ｄ2＝７５m
m、長さＬ2＝３５７mmで容積は約１．５ｌとされる。そ
して、最初の消音室４８の内面には、吸音層５２が積層
されており、該吸音層５２は、セラミックファイバ層５
２ａと耐食性の金属ウール層５２ｂを積層したものであ
り、セラミックファイバ層５２ａによって騒音を吸収
し、金属ウール層５２ｂによってセラミックファイバ層
５２ａを保持している。そして、図６に示すようにサイ
レンサ３２のケース４５の外周には、ステンレス製で化
粧板を兼ねる防熱カバー５３が例えば中心角θ＝２２５
°の範囲で被覆されており、被覆範囲に応じてサイレン
サ３２の放熱量が規制される。In the catalyst device 35 shown in FIGS.
Reference numeral 8 denotes a honeycomb-type catalyst carrier, which is formed by alternately stacking thin corrugated plates of a corrosion-resistant metal to which a catalyst is attached and flat plates, and winding around a side parallel to the uneven stripes of the corrugated plate to form an infinite number of thin plates. A passage is formed and housed in the cylindrical plate 38a. The size of the catalyst carrier 38 is such that the displacement of the engine is 125-125.
In the case of 150 cc, the diameter D 1 = 51 mm and the length L 1 = 7 in FIG.
5 mm. The inner tube 36 is welded to the rear end of the cylindrical body 38a, and a buffer body 39 obtained by deforming a wire mesh into a waveform is wound around the outer circumference, and further covered with a split cover 40. It is connected to the inner wall 42 of the diameter part 31a and is held substantially concentrically with the large diameter part 31a. The silencer 32 connected to the rear end of the inner tube 36 has a cylindrical case 45.
Are formed by a plurality of sets of partition walls 46 and a throttle pipe 47 provided inside the tail pipe, and a tail pipe 51 is provided at the rear end.
The dimensions of the case are as follows: diameter D 2 = 75 m
m, length L 2 = 357 mm, and volume is about 1.5 l. A sound absorbing layer 52 is laminated on the inner surface of the first sound deadening chamber 48, and the sound absorbing layer 52 is formed of the ceramic fiber layer 5.
2a and a corrosion-resistant metal wool layer 52b are laminated, and the noise is absorbed by the ceramic fiber layer 52a, and the ceramic fiber layer 52a is held by the metal wool layer 52b. As shown in FIG. 6, on the outer periphery of the case 45 of the silencer 32, a heat insulating cover 53 made of stainless steel and also serving as a decorative plate is provided, for example, with a central angle θ = 225.
°, and the amount of heat radiation of the silencer 32 is regulated according to the coverage range.
【００１０】なお、前記図４に示される内管３６は、図
７又は図８に示すように伸縮部を設けて温度変化による
熱応力の発生を防止することができる。図７において
は、管３６ａと３６ｂが嵌合部３６ｃによって伸縮自在
に嵌合しており、図８においては、管３６ａに大径部３
６ｃが形成され、他方の管３６ｂにリング３６ｄが固定
されてその前方にシールリング３６ｅが介装され、伸縮
部の気密性を高めている。The inner tube 36 shown in FIG. 4 can be provided with a telescopic part as shown in FIG. 7 or FIG. 8 to prevent the occurrence of thermal stress due to a temperature change. In FIG. 7, the tubes 36a and 36b are elastically fitted by a fitting portion 36c. In FIG. 8, the large-diameter portion 3 is attached to the tube 36a.
6c is formed, a ring 36d is fixed to the other tube 36b, and a seal ring 36e is interposed in front of the ring 36d, thereby improving the airtightness of the expansion and contraction portion.
【００１１】以上により、エンジン１７で発生した排気
は、第１の触媒装置３３で部分的に浄化されたのち膨張
室３１に入り、膨張による消音作用を受けると共に、第
２の触媒装置３５により浄化され、サイレンサ３２を経
て排出される。As described above, the exhaust gas generated by the engine 17 is partially purified by the first catalyst device 33 and then enters the expansion chamber 31, where it undergoes a noise reduction effect due to expansion, and is purified by the second catalyst device 35. Is discharged through the silencer 32.
【００１２】ところが、エンジン１７を高速、高負荷で
運転したのち急減速すると、未燃成分の排出量が急増す
る。図９は高速高負荷回転から１０秒間に急減速してア
イドリング回転に移行させた場合に、サイレンサ３２に
流入する未燃成分の濃度を示すもので、実線は触媒坦体
３８の直径が５１mm、長さ７５mm、点線は直径が４５mm
で同一長さのものを用いた場合を示す。図で明らかなよ
うに、急減速して５秒経過後に空燃比は小になり、ＣＯ
が急増しＨＣは僅かに減少する。このＣＯにテールパイ
プ５１から逆流する空気中のＯ2が反応すると、高温を
発生して前記防音層５２を劣化させるおそれがあるか
ら、この反応を防止するために、本発明においてはサイ
レンサの容積及び放熱性を適切なものとした。However, when the engine 17 is operated at a high speed and a high load, and then suddenly decelerates, the amount of unburned components discharged increases sharply. FIG. 9 shows the concentration of the unburned components flowing into the silencer 32 when the speed is rapidly reduced from the high-speed high-load rotation to the idling rotation for 10 seconds, and the solid line indicates that the diameter of the catalyst carrier 38 is 51 mm. 75mm long, dotted line 45mm in diameter
Shows the case of using the same length. As is apparent from the figure, the air-fuel ratio becomes small 5 seconds after the rapid deceleration,
And HC slightly decreases. If O 2 in the air flowing backward from the tail pipe 51 reacts with this CO, a high temperature may be generated and the soundproof layer 52 may be deteriorated. Therefore, in order to prevent this reaction, the volume of the silencer And heat dissipation was made appropriate.
【００１３】図１０は、触媒坦体３８として直径５１m
m、長さ７５mmのものを用い、サイレンサ３２の容積を
変えた場合における急減速５秒後のサイレンサ内排ガス
温度の変化を示すもので、横軸にサイレンサ容積、縦軸
に排ガス温度をとり、防熱カバー５３を全周（３６０
°）に設けたものをｌ1、半周（２２５°）に設けたも
のをｌ2、設けないものをｌ3で示し、ＣＯ2反応領域
（理論値）をＡで示すと、容積が大きく、防熱カバーの
面積が小さいほど排ガス温度が低くなり、線ｌ2、ｌ3の
容積１．５ｌ以上のものがＣＯ2反応領域Ａから大きく
離れ、１．５ｌで線ｌ2は該領域Ａから３０〜４０℃、
線ｌ3は線７０℃低い値を示している。FIG. 10 shows a catalyst carrier 38 having a diameter of 51 m.
m, 75 mm in length, shows the change in exhaust gas temperature in the silencer after 5 seconds of rapid deceleration when the volume of the silencer 32 is changed. The horizontal axis shows the silencer volume, and the vertical axis shows the exhaust gas temperature. Cover the heat shield 53 all around (360
°) l 1 and those provided in, half (225 °) in the l 2 that is provided, those not provided shown in l 3, the CO 2 reaction areas (theoretical value) shown by A, large volume, exhaust gas temperature is lowered as the area of the heat insulating cover is small, the line l 2, more than the volume 1.5l of l 3 is far from the CO 2 reaction zone a, a line l 2 in 1.5l from region a 30 ~ 40 ° C,
Line l 3 shows a low linear 70 ° C. value.
【００１４】また図１１は、サイレンサ３２の内部の消
音室を２室又は３室にしたときの急減速後の温度変化を
示すもので、横軸に減速後の時間（秒）、縦軸に排気の
温度をとり、容積０．７ｌ、防熱カバー５３を全周に巻
いたものをｌ4、容積１．５ｌで同じく全周に巻いたも
のをｌ5、容積１．５ｌで防熱カバー５３を２２５°被
覆したものをｌ6とすると、サイレンサ内の排気ガス温
度は、容積が大きく防熱カバー５３の小さいものほど低
く、急減速後次第に温度が低下する。ここで、急減速後
１１〜１５秒の間において６００℃以上の領域（図１１
の領域Ｂ）であるとき、逆流してテールパイプ５１から
サイレンサ内に流入した外気と接触し、ＣＯ＋Ｏ 2 の反
応が生じ易いことが、試験の結果明らかになった。よっ
てｌ6で示される１．５ｌで２２５°被覆した例では、
前記領域Ｂに達する前の減速後５秒において約６００℃
に低下するから、前記の反応が生じない。FIG. 11 shows the temperature change after rapid deceleration when the number of silencers in the silencer 32 is two or three. The abscissa indicates the time after deceleration (second), and the ordinate indicates the temperature. Taking the temperature of the exhaust, the volume 0.7 l, the heat insulation cover 53 wound around the entire circumference is l 4 , the volume 1.5 l is wound around the entire circumference l 5 , and the heat insulation cover 53 is 1.5 l in volume. When a material obtained by 225 ° coverage and l 6, the exhaust gas temperature <br/> degree in silencer is low enough that the volume is small greatly heat insulating cover 53, gradually the temperature after the rapid deceleration is reduced. Here, an area of 600 ° C. or higher for 11 to 15 seconds after the rapid deceleration (FIG. 11)
In the region B), the air flows backward from the tail pipe 51
Contacts with the outside air flowing into the silencer, anti of CO + O 2
As a result of the test, it was clarified that the response easily occurred. Yo
In the example of 225 ° coating with 1.5 l, indicated by l 6 ,
About 600 ° C. 5 seconds after deceleration before reaching the area B
Since falls, the reaction does not occur.
【００１５】したがって、図１０、図１１に示すものか
らサイレンサ３２の容積を略１．５ｌ又はそれ以上と
し、その外周の約２／３以下を覆う防熱カバー５３を設
ければ、ＣＯ＋Ｏ2の反応を発生させることなく排出す
ることができ、ＣＯの若干量を外部へ放出するが、防音
層５２の劣化を防止するということができる。Therefore, if the volume of the silencer 32 is made approximately 1.5 liters or more from that shown in FIGS. 10 and 11, and the heat insulating cover 53 covering about 約 or less of the outer periphery is provided, the reaction of CO + O 2 becomes possible. , And a small amount of CO is released to the outside, but it can be said that deterioration of the soundproof layer 52 is prevented.
【００１６】[0016]
【発明の効果】以上のように本発明は、２サイクルエン
ジン排気管の後部に膨張室と触媒装置を備える排気装置
において、その後部に接続するサイレンサ内部でＣＯ＋
Ｏ2の反応が生じるのを防止することができる。したが
って極めて簡単な手段でサイレンサの耐久性を高めるこ
とができる効果を奏する。As described above, according to the present invention, in an exhaust system having an expansion chamber and a catalyst device at the rear of an exhaust pipe of a two-cycle engine, CO + is provided inside a silencer connected to the rear.
O 2 reaction can be prevented from occurring. Therefore, there is an effect that the durability of the silencer can be increased by extremely simple means.
【図１】 本発明を実施した自動二輪車の側面図FIG. 1 is a side view of a motorcycle embodying the present invention.
【図２】 同じく平面図FIG. 2 is also a plan view
【図３】 触媒坦体の斜視図FIG. 3 is a perspective view of a catalyst carrier.
【図４】 触媒装置の断面図FIG. 4 is a sectional view of a catalyst device.
【図５】 図４のＶ−Ｖ線断面図FIG. 5 is a sectional view taken along line VV of FIG. 4;
【図６】 サイレンサの斜視図FIG. 6 is a perspective view of a silencer.
【図７】 内管の他の実施例の断面図FIG. 7 is a sectional view of another embodiment of the inner tube.
【図８】 内管の更に他の実施例の要部断面図FIG. 8 is a sectional view of a main part of still another embodiment of the inner tube.
【図９】 急減速後排出される未燃成分量を示す図表FIG. 9 is a table showing the amount of unburned components discharged after sudden deceleration.
【図１０】 サイレンサ容積と排ガス温度の関係を示す
図表FIG. 10 is a chart showing a relationship between a silencer volume and an exhaust gas temperature.
【図１１】 排ガス温度の変化を示す図表FIG. 11 is a table showing changes in exhaust gas temperature.
１７ エンジン ２３ 排気管 ３１ 膨張室 ３２ サイレンサ ３１ａ 大径部 ３１ｂ 拡径部 ３１ｃ 縮径部 ３３、３５ 触媒 ３６ 内管 ４８、４９、５０ 消音室 ５２ 吸音層 ５３ 防熱カバー 17 Engine 23 Exhaust Pipe 31 Expansion Chamber 32 Silencer 31a Large Diameter Portion 31b Large Diameter Portion 31c Reduced Diameter Portion 33, 35 Catalyst 36 Inner Tube 48, 49, 50 Silencer Room 52 Sound Absorbing Layer 53 Heat Insulation Cover
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−61312（ＪＰ，Ａ) 特開 昭49−111023（ＪＰ，Ａ) 実開 昭54−4917（ＪＰ，Ｕ) 実開 昭63−130615（ＪＰ，Ｕ) 実公 昭47−21004（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.7，ＤＢ名) F01N 3/24 F01N 1/08 F01N 1/14 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-61312 (JP, A) JP-A-49-11103 (JP, A) Fully open 1979-4917 (JP, U) Really open 1988 130615 (JP, U) Jikken 47-21004 (JP, Y1) (58) Fields investigated (Int. Cl. 7 , DB name) F01N 3/24 F01N 1/08 F01N 1/14
Claims (5)
張室を設け、該膨張室内にハニカム型の触媒装置を配置
する自動二輪車の排気装置において、当該触媒装置から
更に下流側に配置するサイレンサ内の排気ガス温度を、
エンジンを高負荷から急減速し約５秒経過後に６００℃
又はそれ以下に維持することを特徴とする、自動二輪車
の排気装置。An expansion chamber is provided downstream of an exhaust pipe of a two-stroke engine, and a honeycomb-type catalyst device is disposed in the expansion chamber.
In the exhaust system of the automatic two-wheeled vehicle that, from the catalytic converter
The exhaust gas temperature in the silencer located further downstream is
Suddenly decelerate the engine from a high load, and after about 5 seconds elapse , 600 ° C
An exhaust system for a motorcycle, characterized in that the exhaust system is maintained at or below this level.
排気ガス温度の維持を、サイレンサの外周部を被覆する
防熱カバーの被覆範囲の調整により行なうことを特徴と
する、自動二輪車の排気装置。2. The system according to claim 1, wherein
To maintain the exhaust gas temperature, coat the outer periphery of the silencer
An exhaust device for a motorcycle, wherein the exhaust device is performed by adjusting a covering range of a heat insulating cover .
媒装置の後端から伸びる内管を、内面に吸音層をもつ円
筒形のサイレンサに接続したことを特徴とする、自動二
輪車の排気装置。3. The exhaust device for a motorcycle according to claim 1, wherein an inner pipe extending from a rear end of the honeycomb-type catalyst device is connected to a cylindrical silencer having a sound absorbing layer on an inner surface.
設け、温度変化による熱応力の発生を防止する構造を備
えることを特徴とする、自動二輪車の排気装置。4. The exhaust device for a motorcycle according to claim 3, further comprising a structure provided with an expansion and contraction portion on the inner pipe to prevent generation of thermal stress due to a temperature change.
サ内面に、セラミックファイバ層を外層とし、耐食性の
金属ウール層を内層として積層した吸音層を設けたこと
を特徴とする、自動二輪車の排気装置。5. The exhaust device for a motorcycle according to claim 1, wherein a sound absorbing layer is provided on the inner surface of the silencer, the ceramic fiber layer being an outer layer, and a corrosion-resistant metal wool layer being an inner layer. .
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03183892A JP3225466B2 (en) | 1992-02-19 | 1992-02-19 | Exhaust system for motorcycle |
| TW081106038A TW211054B (en) | 1992-02-19 | 1992-07-30 | An exhaust gas purification method |
| IT93TO000104A IT1265006B1 (en) | 1992-02-19 | 1993-02-18 | EXHAUST DEVICE FOR MOTORCYCLES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03183892A JP3225466B2 (en) | 1992-02-19 | 1992-02-19 | Exhaust system for motorcycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05231143A JPH05231143A (en) | 1993-09-07 |
| JP3225466B2 true JP3225466B2 (en) | 2001-11-05 |
Family
ID=12342202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03183892A Expired - Fee Related JP3225466B2 (en) | 1992-02-19 | 1992-02-19 | Exhaust system for motorcycle |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3225466B2 (en) |
| IT (1) | IT1265006B1 (en) |
| TW (1) | TW211054B (en) |
-
1992
- 1992-02-19 JP JP03183892A patent/JP3225466B2/en not_active Expired - Fee Related
- 1992-07-30 TW TW081106038A patent/TW211054B/en active
-
1993
- 1993-02-18 IT IT93TO000104A patent/IT1265006B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05231143A (en) | 1993-09-07 |
| ITTO930104A0 (en) | 1993-02-18 |
| TW211054B (en) | 1993-08-11 |
| ITTO930104A1 (en) | 1994-08-18 |
| IT1265006B1 (en) | 1996-10-17 |
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