JP3252548B2 - Engine exhaust system - Google Patents

Engine exhaust system

Info

Publication number
JP3252548B2
JP3252548B2 JP20333993A JP20333993A JP3252548B2 JP 3252548 B2 JP3252548 B2 JP 3252548B2 JP 20333993 A JP20333993 A JP 20333993A JP 20333993 A JP20333993 A JP 20333993A JP 3252548 B2 JP3252548 B2 JP 3252548B2
Authority
JP
Japan
Prior art keywords
catalyst
exhaust
exhaust pipe
engine
supporting portion
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
Application number
JP20333993A
Other languages
Japanese (ja)
Other versions
JPH0754646A (en
Inventor
明男 松本
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.)
Suzuki Motor Co Ltd
Original Assignee
Suzuki 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 Suzuki Motor Co Ltd filed Critical Suzuki Motor Co Ltd
Priority to JP20333993A priority Critical patent/JP3252548B2/en
Priority to KR1019940009951A priority patent/KR0150187B1/en
Priority to CN94105809A priority patent/CN1078304C/en
Priority to ITRM940423A priority patent/IT1272309B/en
Publication of JPH0754646A publication Critical patent/JPH0754646A/en
Application granted granted Critical
Publication of JP3252548B2 publication Critical patent/JP3252548B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • 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
    • Y02T10/12—Improving ICE efficiencies

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、エキゾーストパイプの
内周面に触媒層が設けられた、エンジンの排気装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for an engine in which a catalyst layer is provided on the inner peripheral surface of an exhaust pipe.

【０００２】[0002]

【従来の技術】自動二輪車等のエンジンに用いられてい
る排気装置は、エンジンの排気ポートに連結されるエキ
ゾーストパイプと、このエキゾーストパイプの下流側に
接続される排気マフラとを備えて構成されている。この
ような排気装置の内部には触媒手段が設けられる場合が
多く、上記触媒手段は排気温度の高いエキゾーストパイ
プ内に設けられる。2. Description of the Related Art An exhaust device used in an engine of a motorcycle or the like is provided with an exhaust pipe connected to an exhaust port of the engine and an exhaust muffler connected downstream of the exhaust pipe. I have. In many cases, a catalyst means is provided inside such an exhaust device, and the catalyst means is provided in an exhaust pipe having a high exhaust gas temperature.

【０００３】一般的な触媒手段として、エキゾーストパ
イプの内周面に触媒成分を含んだ溶液を塗布後、これを
焼き付けて触媒層を焼成したものがある。鋼製のエキゾ
ーストパイプの場合は、その内周面に触媒層を直接担持
させることが不可能なため、まずエキゾーストパイプの
内周面にアルミニウムやセラミック系の触媒担持成分を
溶射して触媒担持層を形成し、その上から触媒成分を含
んだ溶液を塗布して焼き付けを行い、触媒層を焼成す
る。As a general catalyst means, there is a method in which a solution containing a catalyst component is applied to the inner peripheral surface of an exhaust pipe and then baked to bake the catalyst layer. In the case of a steel exhaust pipe, since it is impossible to directly support the catalyst layer on the inner peripheral surface of the exhaust pipe, first, an aluminum or ceramic catalyst supporting component is sprayed onto the inner peripheral surface of the exhaust pipe to spray the catalyst supporting layer. Is formed, and a solution containing a catalyst component is applied thereon and baked to bake the catalyst layer.

【０００４】ところが、これでは上記触媒担持層を形成
するのに多大な手間が掛かるため、触媒成分を直接担持
可能なＳＵＳ４３０系のステンレス材等でエキゾースト
パイプを製造し、触媒担持層の形成を省略する方法があ
る。However, this requires a great deal of time to form the catalyst supporting layer. Therefore, an exhaust pipe is made of SUS430 stainless steel or the like that can directly support the catalyst component, and the formation of the catalyst supporting layer is omitted. There is a way to do that.

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、ＳＵＳ
４３０系のステンレス材は鋼材に比べて高価である上に
加工性が悪いので、湾曲した形状を持つ長いエキゾース
トパイプの製造には適していない。SUMMARY OF THE INVENTION However, SUS
430 series stainless steel is expensive and more difficult to work with than steel, and therefore is not suitable for manufacturing a long exhaust pipe having a curved shape.

【０００６】ところで、触媒層を設ける工程はエキゾー
ストパイプの曲げ加工が終了した後とされ、曲げ加工時
における触媒層の剥離が回避されるが、曲げ加工を終了
したエキゾーストパイプは形状が複雑化し、全体的に大
柄になるので、触媒成分の塗布工程時や焼き付け工程時
における作業性が低下する。このため、一度に多数のエ
キゾーストパイプに触媒層を設けることができず、エキ
ゾーストパイプの生産性が悪かった。By the way, the step of providing the catalyst layer is performed after the bending of the exhaust pipe is completed, and peeling of the catalyst layer during the bending is avoided. However, the shape of the exhaust pipe after the bending becomes complicated. Since the whole becomes large, workability in the application step of the catalyst component and the baking step is reduced. For this reason, a catalyst layer cannot be provided on many exhaust pipes at once, and the productivity of the exhaust pipes was poor.

【０００７】さらに、このような方法ではエキゾースト
パイプ内周面の全長に亘って触媒層が形成されてしまう
ので、触媒層の面積が必要以上になる場合があり、これ
によって過剰な触媒反応が誘発され、エキゾーストパイ
プが過熱する等の弊害が発生する恐れがあった。Further, in such a method, since the catalyst layer is formed over the entire length of the inner peripheral surface of the exhaust pipe, the area of the catalyst layer may be more than necessary, thereby causing an excessive catalytic reaction. Therefore, there is a possibility that adverse effects such as overheating of the exhaust pipe may occur.

【０００８】本発明は、上記問題点を解決するべくなさ
れたもので、エキゾーストパイプ湾曲部の曲げ加工性を
犠牲にすることなく、エキゾーストパイプの内周面に適
当な面積で容易に触媒層を形成することができ、エキゾ
ーストパイプの生産性が良いエンジンの排気装置を提供
することを目的とする。The present invention has been made to solve the above problems, and a catalyst layer can be easily formed on an inner peripheral surface of an exhaust pipe with an appropriate area without sacrificing bending workability of a bent portion of the exhaust pipe. It is an object of the present invention to provide an exhaust system for an engine that can be formed and has high exhaust pipe productivity.

【０００９】[0009]

【課題を解決するための手段】上記目的を達成するた
め、本発明に係るエンジンの排気装置は、エンジンの排
気ポートに連結されるエキゾーストパイプと、上記エキ
ゾーストパイプの下流側に接続される排気マフラとを備
えて構成されたエンジンの排気装置において、上記エキ
ゾーストパイプに、触媒成分を直接担持可能な材料でな
る触媒担持部分と、この触媒担持部分の少なくとも片側
の端部に繋がる鋼材製の鋼管部分とを設け、上記触媒担
持部分を直管状に形成してその内周面に触媒層を形成す
るとともに、上記鋼管部分を湾曲させて上記排気ポート
あるいは排気マフラに接続した。In order to achieve the above object, an exhaust system for an engine according to the present invention comprises an exhaust pipe connected to an exhaust port of the engine, and an exhaust muffler connected downstream of the exhaust pipe. In the exhaust device for an engine configured to include: a catalyst supporting portion made of a material capable of directly supporting a catalyst component on the exhaust pipe; and a steel pipe portion connected to at least one end of the catalyst supporting portion. The catalyst supporting portion was formed in a straight tubular shape, a catalyst layer was formed on the inner peripheral surface thereof, and the steel tube portion was curved and connected to the exhaust port or exhaust muffler.

【００１０】また、上記鋼管部分の端部を拡開して挿入
部を形成し、この挿入部に上記触媒担持部分の端部を接
続することにより、鋼管部分と触媒担持部分を接続し
た。Further, the steel pipe portion and the catalyst supporting portion are connected by expanding the end of the steel pipe portion to form an insertion portion and connecting the end portion of the catalyst supporting portion to the insertion portion.

【００１１】[0011]

【作用】エンジンの排気装置をこのように構成した場
合、触媒成分を直接担持可能な材料でなる触媒担持部分
がエキゾーストパイプに設けられたことと、この触媒担
持部分が直管状に形成されたことから、触媒成分の塗布
工程や焼き付け工程時における作業性が飛躍的に向上
し、触媒層の形成が容易になる。When the exhaust device of the engine is configured as described above, the catalyst supporting portion made of a material capable of directly supporting the catalyst component is provided in the exhaust pipe, and the catalyst supporting portion is formed in a straight tubular shape. Therefore, the workability during the application step and the baking step of the catalyst component is remarkably improved, and the formation of the catalyst layer is facilitated.

【００１２】しかも、エキゾーストパイプの湾曲部が、
加工性のよい鋼材で製造された鋼管部分からなっている
ため、エキゾーストパイプ湾曲部の曲げ加工性が良い。
さらに、触媒担持部分が直管状に形成されていて曲げ加
工の必要がないため、例えば加工性の悪い材料を触媒担
持部分に用いても、触媒担持部分の製造が非常に容易で
ある。Moreover, the curved portion of the exhaust pipe is
Since it is made of a steel pipe portion made of a steel material having good workability, the bending workability of the bent portion of the exhaust pipe is good.
Further, since the catalyst supporting portion is formed in a straight tubular shape and does not need to be bent, it is very easy to manufacture the catalyst supporting portion even if, for example, a material having poor workability is used for the catalyst supporting portion.

【００１３】これらにより、エキゾーストパイプの生産
性が大幅に向上する。また、触媒担持部分の長さを任意
に選択することにより、触媒層の面積を最適なものにす
ることができ、同時に高価な材料や触媒成分の使用量を
必要最小限に止めてコストダウンを図ることができる。As a result, the productivity of the exhaust pipe is greatly improved. Also, by arbitrarily selecting the length of the catalyst supporting portion, the area of the catalyst layer can be optimized, and at the same time, the amount of expensive materials and catalyst components used is minimized to reduce costs. Can be planned.

【００１４】さらに、鋼管部分の端部を拡開して挿入部
を形成し、この挿入部に上記触媒担持部分の端部を接続
することにより、鋼管部分と触媒担持部分を接続したの
で、触媒担持部分が加工性の悪い材料で形成されていて
も、触媒担持部分の端部に拡開加工等を施す必要がな
い。したがって、触媒担持部分の加工箇所が一層少なく
なり、エキゾーストパイプの製造をさらに容易なものに
することができる。Further, since the end of the steel pipe portion is expanded to form an insertion portion, and the end portion of the catalyst carrying portion is connected to the insertion portion, the steel pipe portion and the catalyst carrying portion are connected. Even if the supporting portion is formed of a material having poor workability, it is not necessary to perform an expanding process or the like on the end of the catalyst supporting portion. Therefore, the number of processing portions of the catalyst supporting portion is further reduced, and the manufacture of the exhaust pipe can be further facilitated.

【００１５】[0015]

【実施例】以下、本発明の一実施例を図面に基づいて説
明する。An embodiment of the present invention will be described below with reference to the drawings.

【００１６】図１は、本発明に係る排気装置が適用され
たスクータ型の自動二輪車の右側面図である。この自動
二輪車１は、アンダーボーンタイプの車体フレーム２を
備えており、この車体フレーム２の前頭部に、前輪３を
支持するフロントフォーク４がハンドルバー５とともに
左右回動自在に枢着されている。FIG. 1 is a right side view of a scooter type motorcycle to which an exhaust device according to the present invention is applied. The motorcycle 1 includes an underbone type body frame 2. A front fork 4 supporting a front wheel 3 is pivotally mounted on a front head of the body frame 2 together with a handlebar 5 so as to be rotatable left and right. I have.

【００１７】車体フレーム２の後方内部は、ヘルメット
等を収納可能な物品収納室６とされ、その上部に着座シ
ート７が開閉自在に載置され、この着座シート７と前記
ハンドルバー５との間が下方に大きく湾入し、この部分
に乗員の足を載せるステップボード８が形成されてい
る。なお、車体フレーム２の周囲は、合成樹脂製のフレ
ームカバ−９によって全面的に覆われている。An interior of the rear of the body frame 2 is an article storage chamber 6 in which a helmet and the like can be stored, and a seat 7 is placed on the upper part thereof so as to be openable and closable. Is greatly indented downward, and a step board 8 on which the feet of the occupant are placed is formed in this portion. The entire periphery of the vehicle body frame 2 is covered by a synthetic resin frame cover 9.

【００１８】車体フレーム２の下部で車幅方向に架設さ
れているピボット軸１１には、リンク１２を介してパワ
ーユニット１３が上下揺動自在に連結されている。この
パワーユニット１３は、エンジン１４と動力伝達ケース
１５が一体化された一般的な構成のもので、上記動力伝
達ケース１５の後部に後輪１６が軸支され、動力伝達ケ
ース１５に内蔵された図示しない動力伝達装置により、
エンジン１４の動力が後輪１６に伝えられる。なお、パ
ワーユニット１３の後部と車体フレーム２の後部との間
にはショックアブソーバ１７が連結されている。A power unit 13 is connected via a link 12 to a pivot shaft 11 erected in the vehicle width direction below the body frame 2 so as to be vertically swingable. The power unit 13 has a general configuration in which an engine 14 and a power transmission case 15 are integrated. A rear wheel 16 is pivotally supported at the rear of the power transmission case 15 and is incorporated in the power transmission case 15. Not power transmission,
The power of the engine 14 is transmitted to the rear wheels 16. Note that a shock absorber 17 is connected between a rear portion of the power unit 13 and a rear portion of the vehicle body frame 2.

【００１９】エンジン１４のクランクケース１８前面か
らは、シリンダアッセンブリ１９が前方に向かってほぼ
水平に延びており、上記シリンダアッセンブリ１９の下
面には排気ポート２１が設けられ、この排気ポート２１
に排気マフラ２２が接続される。A cylinder assembly 19 extends substantially horizontally from the front of the crankcase 18 of the engine 14 toward the front. An exhaust port 21 is provided on the lower surface of the cylinder assembly 19.
Is connected to the exhaust muffler 22.

【００２０】図２は、エンジン１４および上記排気装置
２２の右側面図である。図１、図２に示すように、この
排気装置２２は、前記排気ポート２１に連結されるエキ
ゾーストパイプ２３と、このエキゾーストパイプ２３の
下流側に接続される排気マフラ２４とを備えて構成され
ており、上記排気マフラ２４の最後部には排気管２５が
設けられている。FIG. 2 is a right side view of the engine 14 and the exhaust device 22. As shown in FIGS. 1 and 2, the exhaust device 22 includes an exhaust pipe 23 connected to the exhaust port 21, and an exhaust muffler 24 connected to a downstream side of the exhaust pipe 23. An exhaust pipe 25 is provided at the rear end of the exhaust muffler 24.

【００２１】排気マフラ２４の上部にはマフラブラケッ
ト２６が設けられ、このマフラブラケット２６がボルト
２７等でクランクケース１８に固定される。なお、排気
マフラ２４の内部には、例えば複数の膨脹室が画成さ
れ、消音部材等が内蔵されている。A muffler bracket 26 is provided above the exhaust muffler 24, and the muffler bracket 26 is fixed to the crankcase 18 with bolts 27 or the like. In addition, inside the exhaust muffler 24, for example, a plurality of expansion chambers are defined, and a muffling member and the like are built in.

【００２２】図３は、本発明の一実施例を示している。
前記エキゾーストパイプ２３には、触媒成分を直接担持
可能な材料、例えばＳＵＳ４３０系のステンレス材でな
る触媒担持部分２８と、この触媒担持部分２８の前後に
繋がる鋼材製の鋼管部分２９，３０とが設けられてい
る。FIG. 3 shows an embodiment of the present invention.
The exhaust pipe 23 is provided with a catalyst supporting portion 28 made of a material capable of directly supporting a catalyst component, for example, a SUS430 stainless steel material, and steel tube portions 29 and 30 connected to the front and rear of the catalyst supporting portion 28. Have been.

【００２３】上記触媒担持部分２８は直管状に形成さ
れ、その内周面に触媒層が形成される。この触媒層は、
触媒担持部分２８の内周面に触媒成分を含む溶液を直接
塗布し、これを焼き付けることによって形成される。The catalyst carrying portion 28 is formed in a straight tubular shape, and a catalyst layer is formed on the inner peripheral surface thereof. This catalyst layer
It is formed by directly applying a solution containing a catalyst component to the inner peripheral surface of the catalyst supporting portion 28 and baking it.

【００２４】一方、上記鋼管部分２９，３０は湾曲し、
それぞれ排気ポート２１と排気マフラ２４に接続され
る。鋼管部分２９の先端部には、排気ポート２１に挿入
される口金部３１と、固定用のフランジ３２が設けられ
ている。On the other hand, the steel pipe portions 29 and 30 are curved,
Each is connected to an exhaust port 21 and an exhaust muffler 24. The tip of the steel pipe portion 29 is provided with a base 31 inserted into the exhaust port 21 and a fixing flange 32.

【００２５】鋼管部分２９，３０の端部は拡開されて挿
入部３３，３４が形成され、この挿入部３３，３４に触
媒担持部分２８の両端部が挿入される。これにより、鋼
管部分２９，３０と触媒担持部分２８の接続がなされ
る。この接続部は、溶接等によって固定される。The ends of the steel pipe portions 29, 30 are expanded to form insertion portions 33, 34, into which both ends of the catalyst carrying portion 28 are inserted. Thus, the connection between the steel pipe portions 29 and 30 and the catalyst carrying portion 28 is made. This connection part is fixed by welding or the like.

【００２６】以上のように構成された排気装置２２によ
れば、触媒成分を直接担持可能な材料でなる触媒担持部
分２８がエキゾーストパイプ２３に設けられたことと、
この触媒担持部分２８が直管状に形成されたことから、
触媒成分の塗布工程や焼き付け工程時における作業性が
飛躍的に向上し、触媒層の形成が容易になる。According to the exhaust device 22 configured as described above, the catalyst supporting portion 28 made of a material capable of directly supporting the catalyst component is provided on the exhaust pipe 23;
Since the catalyst supporting portion 28 was formed in a straight tubular shape,
Workability during the application and baking steps of the catalyst component is dramatically improved, and the formation of the catalyst layer is facilitated.

【００２７】しかも、エキゾーストパイプ２３の湾曲部
が、加工性のよい鋼材で製造された鋼管部分２９，３０
からなっているため、エキゾーストパイプ２３の湾曲部
の曲げ加工性が良い。さらに、触媒担持部分２８が直管
状に形成されていて曲げ加工の必要がないため、本実施
例のように触媒担持部分２８が加工性の悪いＳＵＳ４３
０系のステンレス材で製造されている場合でも、その製
造が非常に容易である。Further, the curved portion of the exhaust pipe 23 is made of a steel pipe portion 29, 30 made of a steel material having good workability.
Therefore, the bent portion of the exhaust pipe 23 has good bending workability. Further, since the catalyst supporting portion 28 is formed in a straight tubular shape and does not need to be bent, the catalyst supporting portion 28 has a poor workability such as SUS43 as in this embodiment.
Even if it is made of a stainless steel of type 0, its manufacture is very easy.

【００２８】これらにより、エキゾーストパイプ２３の
生産性が大幅に向上する。また、触媒担持部分２８の長
さを任意に選択することにより、触媒層の面積を最適な
ものにすることができ、同時に高価な材料（ＳＵＳ４３
０）や触媒成分の使用量を必要最小限に止めてコストダ
ウンを図ることができる。Thus, the productivity of the exhaust pipe 23 is greatly improved. Further, by arbitrarily selecting the length of the catalyst supporting portion 28, the area of the catalyst layer can be optimized, and at the same time, an expensive material (SUS43) can be used.
0) and the amount of catalyst components used can be kept to a minimum to reduce costs.

【００２９】さらに、鋼管部分２９，３０の端部を拡開
して挿入部３３，３４を形成し、この挿入部３３，３４
に触媒担持部分２８の端部を接続することにより、鋼管
部分２９，３０と触媒担持部分２８を接続したので、触
媒担持部分２８が加工性の悪い材料で形成されていて
も、触媒担持部分２８の端部に拡開加工等を施す必要が
ない。したがって、触媒担持部分２８の加工箇所が一層
少なくなり、エキゾーストパイプ２３の製造をさらに容
易なものにすることができる。Further, the ends of the steel pipe portions 29, 30 are expanded to form insertion portions 33, 34, and the insertion portions 33, 34 are formed.
Since the end portions of the catalyst supporting portion 28 are connected to the steel pipe portions 29 and 30 and the catalyst supporting portion 28, the catalyst supporting portion 28 is formed even if the catalyst supporting portion 28 is formed of a material having poor workability. It is not necessary to apply an expanding process or the like to the end of the frame. Therefore, the number of processing portions of the catalyst supporting portion 28 is further reduced, and the manufacture of the exhaust pipe 23 can be further facilitated.

【００３０】なお、本実施例では触媒担持部分２８の両
端に鋼管部分２９，３０が設けられているが、例えば触
媒担持部分２８の上流側の鋼管部分２９のみを残し、触
媒担持部分２８の下流側を直接排気マフラ２４に接続す
る構造としても良い。In this embodiment, the steel pipe portions 29, 30 are provided at both ends of the catalyst support portion 28. For example, only the steel pipe portion 29 on the upstream side of the catalyst support portion 28 is left, and the downstream portion of the catalyst support portion 28 is left. The side may be directly connected to the exhaust muffler 24.

【００３１】[0031]

【発明の効果】以上説明したように、本発明に係るエン
ジンの排気装置は、エンジンの排気ポートに連結される
エキゾーストパイプと、上記エキゾーストパイプの下流
側に接続される排気マフラとを備えて構成されたエンジ
ンの排気装置において、上記エキゾーストパイプに、触
媒成分を直接担持可能な材料でなる触媒担持部分と、こ
の触媒担持部分の少なくとも片側の端部に繋がる鋼材製
の鋼管部分とを設け、上記触媒担持部分を直管状に形成
してその内周面に触媒層を形成するとともに、上記鋼管
部分を湾曲させて上記排気ポートあるいは排気マフラに
接続したことを特徴とするものである。As described above, the exhaust system for an engine according to the present invention includes an exhaust pipe connected to an exhaust port of the engine, and an exhaust muffler connected downstream of the exhaust pipe. In the exhaust system of the engine, the exhaust pipe is provided with a catalyst supporting portion made of a material capable of directly supporting a catalyst component, and a steel pipe portion connected to at least one end of the catalyst supporting portion. The catalyst carrying portion is formed in a straight tubular shape, a catalyst layer is formed on the inner peripheral surface thereof, and the steel pipe portion is curved and connected to the exhaust port or the exhaust muffler.

【００３２】これによれば、触媒成分を直接担持可能な
材料でなる触媒担持部分がエキゾーストパイプに設けら
れたことと、この触媒担持部分が直管状に形成されたこ
とから、触媒成分の塗布工程や焼き付け工程時における
作業性が飛躍的に向上し、触媒層の形成が容易になる。According to this, since the catalyst support portion made of a material capable of directly supporting the catalyst component is provided in the exhaust pipe and the catalyst support portion is formed in a straight tube, the catalyst component application step Workability during the baking process is greatly improved, and the formation of the catalyst layer is facilitated.

【００３３】しかも、エキゾーストパイプの湾曲部が、
加工性のよい鋼材で製造された鋼管部分からなっている
ため、エキゾーストパイプ湾曲部の曲げ加工性が良い。
さらに、触媒担持部分が直管状に形成されていて曲げ加
工の必要がないため、例えば加工性の悪い材料を触媒担
持部分に用いても、触媒担持部分の製造が非常に容易で
ある。Moreover, the curved portion of the exhaust pipe is
Since it is made of a steel pipe portion made of a steel material having good workability, the bending workability of the bent portion of the exhaust pipe is good.
Further, since the catalyst supporting portion is formed in a straight tubular shape and does not need to be bent, it is very easy to manufacture the catalyst supporting portion even if, for example, a material having poor workability is used for the catalyst supporting portion.

【００３４】これらにより、エキゾーストパイプの生産
性が大幅に向上する。また、触媒担持部分の長さを任意
に選択することにより、触媒層の面積を最適なものにす
ることができ、同時に高価な材料や触媒成分の使用量を
必要最小限に止めてコストダウンを図ることができる。Thus, the productivity of the exhaust pipe is greatly improved. Also, by arbitrarily selecting the length of the catalyst supporting portion, the area of the catalyst layer can be optimized, and at the same time, the amount of expensive materials and catalyst components used is minimized to reduce costs. Can be planned.

【００３５】そして、本発明に係るエンジンの排気装置
は、上記鋼管部分の端部を拡開して挿入部を形成し、こ
の挿入部に上記触媒担持部分の端部を接続することによ
り、鋼管部分と触媒担持部分を接続したことを特徴とす
るので、触媒担持部分が加工性の悪い材料で形成されて
いても、触媒担持部分の端部に拡開加工等を施す必要が
ない。したがって、触媒担持部分の加工箇所が一層少な
くなり、エキゾーストパイプの製造をさらに容易なもの
にすることができる。In the exhaust system for an engine according to the present invention, the end portion of the steel pipe portion is expanded to form an insertion portion, and the end portion of the catalyst supporting portion is connected to the insertion portion, thereby forming the steel pipe portion. Since the portion is connected to the catalyst-carrying portion, even if the catalyst-carrying portion is formed of a material having poor workability, it is not necessary to apply an expanding process to the end of the catalyst-carrying portion. Therefore, the number of processing portions of the catalyst supporting portion is further reduced, and the manufacture of the exhaust pipe can be further facilitated.

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

【図１】本発明に係る排気装置が適用されたスクータ型
自動二輪車の右側面図。FIG. 1 is a right side view of a scooter type motorcycle to which an exhaust device according to the present invention is applied.

【図２】エンジンおよび排気装置の右側面図。FIG. 2 is a right side view of the engine and the exhaust device.

【図３】本発明の一実施例を示す、エキゾーストパイプ
の右側面図。FIG. 3 is a right side view of an exhaust pipe showing one embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１４ エンジン ２１ 排気ポート ２２ 排気装置 ２３ エキゾーストパイプ ２４ 排気マフラ ２８ 触媒担持部分 ２９，３０ 鋼管部分 ３３，３４ 挿入部 14 Engine 21 Exhaust port 22 Exhaust device 23 Exhaust pipe 24 Exhaust muffler 28 Catalyst supporting part 29, 30 Steel pipe part 33, 34 Insertion part

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F01N 3/24 - 3/28 F01N 7/08 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) F01N 3/24-3/28 F01N 7/08

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 エンジンの排気ポートに連結されるエキ
ゾーストパイプと、上記エキゾーストパイプの下流側に
接続される排気マフラとを備えて構成されたエンジンの
排気装置において、上記エキゾーストパイプに、触媒成
分を直接担持可能な材料でなる触媒担持部分と、この触
媒担持部分の少なくとも片側の端部に繋がる鋼材製の鋼
管部分とを設け、上記触媒担持部分を直管状に形成して
その内周面に触媒層を形成するとともに、上記鋼管部分
を湾曲させて上記排気ポートあるいは排気マフラに接続
したことを特徴とするエンジンの排気装置。1. An exhaust system for an engine, comprising: an exhaust pipe connected to an exhaust port of an engine; and an exhaust muffler connected to a downstream side of the exhaust pipe, wherein a catalyst component is added to the exhaust pipe. A catalyst supporting portion made of a material that can be directly supported and a steel pipe portion connected to at least one end of the catalyst supporting portion are provided, and the catalyst supporting portion is formed into a straight tubular shape, and a catalyst is formed on an inner peripheral surface thereof. An exhaust device for an engine, wherein a layer is formed and the steel pipe portion is curved and connected to the exhaust port or the exhaust muffler. 【請求項２】 上記鋼管部分の端部を拡開して挿入部を
形成し、この挿入部に上記触媒担持部分の端部を接続す
ることにより、鋼管部分と触媒担持部分を接続したこと
を特徴とする、請求項１に記載のエンジンの排気装置。2. An end portion of the steel pipe portion is expanded to form an insertion portion, and the end portion of the catalyst support portion is connected to the insertion portion, thereby connecting the steel pipe portion and the catalyst support portion. The exhaust device for an engine according to claim 1, characterized in that:
JP20333993A 1993-08-17 1993-08-17 Engine exhaust system Expired - Fee Related JP3252548B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP20333993A JP3252548B2 (en) 1993-08-17 1993-08-17 Engine exhaust system
KR1019940009951A KR0150187B1 (en) 1993-08-17 1994-05-06 Exhaust device of an engine
CN94105809A CN1078304C (en) 1993-08-17 1994-05-13 Exhaust system of engine
ITRM940423A IT1272309B (en) 1993-08-17 1994-06-27 EXHAUST SYSTEM FOR AN ENGINE, IN PARTICULAR A MOTORCYCLE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20333993A JP3252548B2 (en) 1993-08-17 1993-08-17 Engine exhaust system

Publications (2)

Publication Number Publication Date
JPH0754646A JPH0754646A (en) 1995-02-28
JP3252548B2 true JP3252548B2 (en) 2002-02-04

Family

ID=16472389

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20333993A Expired - Fee Related JP3252548B2 (en) 1993-08-17 1993-08-17 Engine exhaust system

Country Status (4)

Country Link
JP (1) JP3252548B2 (en)
KR (1) KR0150187B1 (en)
CN (1) CN1078304C (en)
IT (1) IT1272309B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08332344A (en) * 1995-06-09 1996-12-17 Honda Motor Co Ltd Exhaust gas purifying apparatus for internal combustion engine
JP4786933B2 (en) * 2005-05-11 2011-10-05 本田技研工業株式会社 Motorcycle exhaust system
JP4689474B2 (en) * 2006-01-11 2011-05-25 本田技研工業株式会社 Internal combustion engine
JP4687544B2 (en) 2006-04-17 2011-05-25 日産自動車株式会社 Piping fixing structure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2081433U (en) * 1991-01-23 1991-07-24 光阳工业股份有限公司 Catalytic gas-purifying device for locomotive
US5185998A (en) * 1992-04-10 1993-02-16 Kenneth Brew Catalytic converter accessory apparatus

Also Published As

Publication number Publication date
ITRM940423A0 (en) 1994-06-27
KR0150187B1 (en) 1998-10-01
ITRM940423A1 (en) 1995-12-27
JPH0754646A (en) 1995-02-28
CN1078304C (en) 2002-01-23
KR950006205A (en) 1995-03-20
CN1102687A (en) 1995-05-17
IT1272309B (en) 1997-06-16

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