JPH09158722A - Exhaust device for single cylinder internal combustion engine - Google Patents
Exhaust device for single cylinder internal combustion engineInfo
- Publication number
- JPH09158722A JPH09158722A JP7345741A JP34574195A JPH09158722A JP H09158722 A JPH09158722 A JP H09158722A JP 7345741 A JP7345741 A JP 7345741A JP 34574195 A JP34574195 A JP 34574195A JP H09158722 A JPH09158722 A JP H09158722A
- Authority
- JP
- Japan
- Prior art keywords
- secondary air
- expansion chamber
- catalyst
- exhaust
- internal combustion
- 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.)
- Withdrawn
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
- 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
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
Landscapes
- 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)
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は汎用ガソリン機関の
排気ガス浄化に適する単気筒内燃機関の排気装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for a single-cylinder internal combustion engine suitable for purifying exhaust gas of a general-purpose gasoline engine.
【０００２】[0002]
【従来の技術】図２に、従来の汎用エンジン用排気系の
一例を示す。１は排気消音器本体、２はフランジで図示
しないエンジンのヘッドの排気口の取付面と適合する。
３は第１拡張室、４は第２拡張室、５は第３拡張室であ
る。６は入口管で、エンジン本体から流出した排ガスが
流入し、小孔を通って第１拡張室３に流入する。2. Description of the Related Art FIG. 2 shows an example of a conventional exhaust system for a general-purpose engine. Reference numeral 1 is an exhaust silencer body, and 2 is a flange, which fits with an attachment surface of an exhaust port of an engine head (not shown).
3 is a first expansion chamber, 4 is a second expansion chamber, and 5 is a third expansion chamber. Reference numeral 6 denotes an inlet pipe, into which the exhaust gas flowing out from the engine body flows, passes through the small holes, and flows into the first expansion chamber 3.
【０００３】７は連通管で、第１拡張室３から排ガスが
第２拡張室４へ流入する。８は仕切り板で、第２拡張室
４と第３拡張室５を仕切っている。また、仕切り板８に
は触媒担体９が構成され、排ガスが第２拡張室４から触
媒担体９を通って第３拡張室５に流れる間に、排ガス成
分が浄化される。１０は出口管で、第３拡張室５から排
ガスを大気に排出する。Reference numeral 7 is a communication pipe through which exhaust gas flows from the first expansion chamber 3 into the second expansion chamber 4. A partition plate 8 partitions the second expansion chamber 4 and the third expansion chamber 5. Further, the partition plate 8 is provided with a catalyst carrier 9, and the exhaust gas component is purified while the exhaust gas flows from the second expansion chamber 4 through the catalyst carrier 9 to the third expansion chamber 5. An outlet pipe 10 discharges exhaust gas from the third expansion chamber 5 to the atmosphere.
【０００４】[0004]
【発明が解決しようとする課題】触媒により排ガス浄化
を行うためには、以下（１）〜（３）の各項が必要とな
る。 （１） 三元触媒を用いる場合、空気と燃料の混合比を
精度よくコントロ−ルする必要がある。 （２） 酸化触媒を用いる場合、酸素を確保するため理
論混合比より酸素のリッチな条件で運転すべきである。In order to purify exhaust gas with a catalyst, the following items (1) to (3) are required. (1) When using a three-way catalyst, it is necessary to accurately control the mixing ratio of air and fuel. (2) When an oxidation catalyst is used, it should be operated under conditions richer in oxygen than the theoretical mixing ratio in order to secure oxygen.
【０００５】（３） 酸化触媒の場合、触媒前に二次空
気を導入すること。 しかし、（１）は燃料供給装置のコストが高く、（２）
は燃焼性能の確保が難しくなる。（３）については排気
脈動を用いる方法があるが、十分な二次空気量を確保す
るのが難しい。(3) In the case of an oxidation catalyst, secondary air should be introduced before the catalyst. However, (1) has a high cost of the fuel supply device, and (2)
Makes it difficult to secure combustion performance. Regarding (3), there is a method using exhaust pulsation, but it is difficult to secure a sufficient amount of secondary air.
【０００６】本発明の目的は、簡単な機構で適正な量の
二次空気を触媒に供給できる安価で効率のよい単気筒内
燃機関の排気装置を提供するにある。An object of the present invention is to provide an inexpensive and efficient exhaust system for a single-cylinder internal combustion engine capable of supplying an appropriate amount of secondary air to a catalyst with a simple mechanism.
【０００７】[0007]
【課題を解決するための手段】請求項１に記載の単気筒
内燃機関の排気装置は複数の膨張室を有する消音器内に
触媒を設けてなる単気筒内燃機関の排気装置において、
前記消音器に前記触媒より上流側の膨張室または排気通
路にリ−ド弁を介して二次空気を導入する二次空気導入
装置を設けてなることを特徴としている。An exhaust system for a single-cylinder internal combustion engine according to claim 1, wherein a catalyst is provided in a silencer having a plurality of expansion chambers.
The silencer is provided with a secondary air introducing device for introducing secondary air into the expansion chamber or the exhaust passage on the upstream side of the catalyst via a lead valve.
【０００８】請求項２に記載の単気筒内燃機関の排気装
置は複数の膨張室を有する消音器内に触媒を設けてなる
単気筒内燃機関の排気装置において、前記触媒より上流
側の膨張室または排気通路にリ−ド弁を介して二次空気
を導入する二次空気導入装置を設けると共に、前記消音
器の出口管の長さをＬ、エンジンの行程容積をＶとした
とき、Ｌ／Ｖ＝１／１０〜１／２（ｃｍ-2）に設定した
ことを特徴としている。The exhaust system for a single-cylinder internal combustion engine according to a second aspect is an exhaust system for a single-cylinder internal combustion engine in which a catalyst is provided in a muffler having a plurality of expansion chambers. A secondary air introducing device for introducing secondary air into the exhaust passage through a lead valve is provided, and when the length of the outlet pipe of the silencer is L and the stroke volume of the engine is V, L / V = 1/10 to 1/2 (cm -2 ) is set.
【０００９】排気消音器出口管の長さＬは短く設定する
と大きな排気脈動は得られず、負圧も小さくなり排ガス
浄化に十分な空気量は得られない。また前記排気消音器
出口管が長過ぎてもエンジン性能に悪影響を及ぼす。When the length L of the exhaust silencer outlet pipe is set to be short, a large exhaust pulsation cannot be obtained, the negative pressure is also small, and an air amount sufficient for exhaust gas purification cannot be obtained. Further, if the exhaust silencer outlet pipe is too long, the engine performance is adversely affected.
【００１０】前記手段に記載した長さＬの排気消音器出
口管を用いることにより適正な負圧が得られ、従って触
媒前に適量の二次空気が導入できる。また二次空気導入
通路に設けたリ−ド弁により一度排気通路に導入された
二次空気は逆流することなく有効に使用される。By using the exhaust silencer outlet pipe of the length L described in the above means, a proper negative pressure can be obtained, and therefore a proper amount of secondary air can be introduced before the catalyst. Further, the secondary air once introduced into the exhaust passage is effectively used without reverse flow by the lead valve provided in the secondary air introduction passage.
【００１１】[0011]
【発明の実施の形態】第１図に本発明の一実施例を示
す。１０１は排気消音器本体、１０２はフランジ、１０
３は第１拡張室、１０４は第２拡張室、１０５は第３拡
張室、１０６は入口管、１０７は連通管、１０８は仕切
り板、１０９は触媒担体、１１０は出口管である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. 101 is an exhaust silencer body, 102 is a flange, 10
3 is a first expansion chamber, 104 is a second expansion chamber, 105 is a third expansion chamber, 106 is an inlet pipe, 107 is a communication pipe, 108 is a partition plate, 109 is a catalyst carrier, and 110 is an outlet pipe.
【００１２】エンジン（図示せず）から排出された排ガ
スは、入口管１０６、第１拡張室１０３、連通管１０
７、第２拡張室１０４、触媒担体１０９、第３拡張室１
０５、出口管１１０を経て大気へ放出される。一方、連
通管１０７内には二次空気導入通路１１１が開口し、排
気脈動によって生じる負圧時に１１２のエアクリ−ナ、
１１３のリ−ド弁を介して二次空気が導入される。Exhaust gas discharged from the engine (not shown) has an inlet pipe 106, a first expansion chamber 103, and a communication pipe 10.
7, second expansion chamber 104, catalyst carrier 109, third expansion chamber 1
05, it is discharged to the atmosphere through the outlet pipe 110. On the other hand, a secondary air introduction passage 111 opens in the communication pipe 107, and an air cleaner 112 at the time of negative pressure generated by exhaust pulsation,
Secondary air is introduced through the lead valve at 113.
【００１３】排ガス浄化を効率よく行うため、適正な排
気脈動を得る必要があり、出口管１１０の長さＬはエン
ジンの行程容積Ｖに対し、 Ｌ／Ｖ＝１／１０〜１／２
（ｃｍ-2）に規定されている。In order to efficiently purify the exhaust gas, it is necessary to obtain appropriate exhaust pulsation, and the length L of the outlet pipe 110 is L / V = 1/10 to 1/2 with respect to the stroke volume V of the engine.
(Cm -2 ).
【００１４】本実施例では、二次空気の導入位置を連通
管１０７の内としたが、入口管１０６や、触媒担体１０
９の前流側にあるいずれかの拡張室、または、エンジン
と排気消音器１０１との間に新たに設けた通路としても
構わない。また、エアクリ−ナ１１２は必ずしも必要で
はないが、エンジン本体に空気を供給するためのエアク
リ−ナ（図示せず）と共用しても構わない。In this embodiment, the introduction position of the secondary air is inside the communication pipe 107, but the inlet pipe 106 and the catalyst carrier 10 are not shown.
9 may be any of the expansion chambers on the upstream side or a passage newly provided between the engine and the exhaust silencer 101. Further, the air cleaner 112 is not always necessary, but may be shared with an air cleaner (not shown) for supplying air to the engine body.
【００１５】[0015]
【発明の効果】本特許請求範囲に述べた構成とすること
により、簡単な機構で適正な量の二次空気量を触媒に供
給できるため、安価で効率よい排ガス浄化装置が得られ
る。With the structure described in the claims of the present invention, an appropriate amount of secondary air can be supplied to the catalyst with a simple mechanism, so that an inexpensive and efficient exhaust gas purification apparatus can be obtained.
【図１】本発明の実施例に係る要部の断面図。FIG. 1 is a sectional view of a main part according to an embodiment of the present invention.
【図２】従来の汎用エンジン用排気消音器を示す要部断
面図。FIG. 2 is a cross-sectional view of essential parts showing a conventional exhaust silencer for a general-purpose engine.
【符号の説明】 １…排気消音器本体、２…フランジ、３…第１拡張室、
４…第２拡張室、５…第３拡張室、６…入口管、７…連
通管、８…仕切り板、９…触媒担体、１０…出口管、１
２１…排気消音器本体、１０２…フランジ、１０３…第
１拡張室、１０４…第２拡張室、１０５…第３拡張室、
１０６…入口管、１０７…連通管、１０８…仕切り板、
１０９…触媒担体、１１０…出口管、１１１…二次空気
導入通路、１１２…エアクリ−ナ、１１３…リ−ド弁。[Explanation of Codes] 1 ... Exhaust silencer body, 2 ... Flange, 3 ... First expansion chamber,
4 ... 2nd expansion chamber, 5 ... 3rd expansion chamber, 6 ... Inlet pipe, 7 ... Communication pipe, 8 ... Partition plate, 9 ... Catalyst carrier, 10 ... Exit pipe, 1
21 ... Exhaust silencer body, 102 ... Flange, 103 ... First expansion chamber, 104 ... Second expansion chamber, 105 ... Third expansion chamber,
106 ... Inlet pipe, 107 ... Communication pipe, 108 ... Partition plate,
109 ... Catalyst carrier, 110 ... Exit pipe, 111 ... Secondary air introducing passage, 112 ... Air cleaner, 113 ... Read valve.
Claims (2)
設けてなる単気筒内燃機関の排気装置において、前記消
音器に前記触媒より上流側の膨張室または排気通路にリ
−ド弁を介して二次空気を導入する二次空気導入装置を
設けてなることを特徴とする単気筒内燃機関の排気装
置。1. An exhaust system for a single-cylinder internal combustion engine in which a catalyst is provided in a silencer having a plurality of expansion chambers, and a lead valve is provided in the expansion chamber or exhaust passage upstream of the catalyst in the silencer. An exhaust device for a single-cylinder internal combustion engine, characterized in that a secondary air introducing device for introducing secondary air through the device is provided.
設けてなる単気筒内燃機関の排気装置において、前記触
媒より上流側の膨張室または排気通路にリ−ド弁を介し
て二次空気を導入する二次空気導入装置を設けると共
に、前記消音器の出口管の長さをＬ、エンジンの行程容
積をＶとしたとき、Ｌ／Ｖ＝１／１０〜１／２（ｃ
ｍ-2）に設定したことを特徴とする単気筒内燃機関の排
気装置。2. An exhaust system for a single-cylinder internal combustion engine in which a catalyst is provided in a muffler having a plurality of expansion chambers, wherein a secondary valve is provided in an expansion chamber or an exhaust passage upstream of the catalyst via a lead valve. A secondary air introduction device for introducing air is provided, and when the length of the outlet pipe of the silencer is L and the stroke volume of the engine is V, L / V = 1/10 to 1/2 (c
m -2 ), an exhaust system for a single cylinder internal combustion engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7345741A JPH09158722A (en) | 1995-12-08 | 1995-12-08 | Exhaust device for single cylinder internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7345741A JPH09158722A (en) | 1995-12-08 | 1995-12-08 | Exhaust device for single cylinder internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09158722A true JPH09158722A (en) | 1997-06-17 |
Family
ID=18378661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7345741A Withdrawn JPH09158722A (en) | 1995-12-08 | 1995-12-08 | Exhaust device for single cylinder internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09158722A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5887424A (en) * | 1996-04-05 | 1999-03-30 | Kawasaki Jukogyo Kabushiki Kaisha | Exhaust apparatus for engine |
| CN1296607C (en) * | 2003-03-28 | 2007-01-24 | 上海江迪数码科技有限公司 | Internal combustion engine waste gas purifying noise suppresor |
| EP1895118A1 (en) * | 2006-08-29 | 2008-03-05 | Tecumseh Products Company | Passive secondary air muffler |
| US7464543B2 (en) * | 2004-05-25 | 2008-12-16 | Cameron International Corporation | Two-stroke lean burn gas engine with a silencer/catalytic converter |
| CN100443701C (en) * | 2005-03-18 | 2008-12-17 | 雅马哈发动机株式会社 | Exhaust gas purification device |
| JP2010223192A (en) * | 2009-03-25 | 2010-10-07 | Hanken Seisakusho:Kk | Muffler |
| US9388718B2 (en) | 2014-03-27 | 2016-07-12 | Ge Oil & Gas Compression Systems, Llc | System and method for tuned exhaust |
-
1995
- 1995-12-08 JP JP7345741A patent/JPH09158722A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5887424A (en) * | 1996-04-05 | 1999-03-30 | Kawasaki Jukogyo Kabushiki Kaisha | Exhaust apparatus for engine |
| CN1296607C (en) * | 2003-03-28 | 2007-01-24 | 上海江迪数码科技有限公司 | Internal combustion engine waste gas purifying noise suppresor |
| US7765799B2 (en) | 2004-05-25 | 2010-08-03 | Cameron International Corporation | Two-stroke lean burn gas engine with a silencer/catalytic converter |
| US7464543B2 (en) * | 2004-05-25 | 2008-12-16 | Cameron International Corporation | Two-stroke lean burn gas engine with a silencer/catalytic converter |
| US7690194B2 (en) | 2004-05-25 | 2010-04-06 | Cameron International Corporation | Two-stroke lean burn gas engine with a silencer/catalytic converter |
| US7818963B2 (en) | 2004-05-25 | 2010-10-26 | Cameron International Corporation | Two-stroke lean burn gas engine with a silencer/catalytic converter |
| US8646260B2 (en) | 2004-05-25 | 2014-02-11 | Cameron International Corporation | Two-stroke lean burn gas engine with a silencer/catalytic converter |
| US9771844B2 (en) | 2004-05-25 | 2017-09-26 | Ge Oil & Gas Compression Systems, Llc | Two-stroke lean burn gas engine with a silencer-catalytic converter |
| CN100443701C (en) * | 2005-03-18 | 2008-12-17 | 雅马哈发动机株式会社 | Exhaust gas purification device |
| EP1895118A1 (en) * | 2006-08-29 | 2008-03-05 | Tecumseh Products Company | Passive secondary air muffler |
| US7854296B2 (en) | 2006-08-29 | 2010-12-21 | Certified Ports Corporation | Passive secondary air muffler |
| JP2010223192A (en) * | 2009-03-25 | 2010-10-07 | Hanken Seisakusho:Kk | Muffler |
| US9388718B2 (en) | 2014-03-27 | 2016-07-12 | Ge Oil & Gas Compression Systems, Llc | System and method for tuned exhaust |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030304 |