JP2006046264A - Muffler with catalyst for internal combustion engine - Google Patents

Muffler with catalyst for internal combustion engine Download PDF

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Publication number
JP2006046264A
JP2006046264A JP2004231133A JP2004231133A JP2006046264A JP 2006046264 A JP2006046264 A JP 2006046264A JP 2004231133 A JP2004231133 A JP 2004231133A JP 2004231133 A JP2004231133 A JP 2004231133A JP 2006046264 A JP2006046264 A JP 2006046264A
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Prior art keywords
catalyst
wall panel
expansion chamber
muffler
diffuser
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JP2004231133A
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JP3955293B2 (en
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Kazuhiro Tsutsui
和弘 筒井
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Kioritz Corp
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Kioritz Corp
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Priority to JP2004231133A priority Critical patent/JP3955293B2/en
Priority to DE102005037102A priority patent/DE102005037102B4/en
Priority to US11/197,905 priority patent/US20060026953A1/en
Publication of JP2006046264A publication Critical patent/JP2006046264A/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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1833—Construction facilitating manufacture, assembly, or disassembly specially adapted for small internal combustion engines, e.g. used in model applications
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • 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
    • F01N13/002—Apparatus adapted for particular uses, e.g. for portable devices driven by machines or engines
    • 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
    • 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
    • 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
    • F01N2230/00—Combination of silencers and other devices
    • F01N2230/04—Catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/06—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hand-held tools or portables devices

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffler with a catalyst with an enlarged degree of freedom in designing the position and form of an outlet for exhaust gas. <P>SOLUTION: An expansion chamber 25 is parted by a partition panel 23 disposed between a front outer wall panel 21 and a rear outer wall panel 22 to a first expansion chamber 25A and a second expansion chamber 25B. A diffuser 40 in a cylindrical form having a bottom is disposed in the first expansion chamber 25A. A catalyst 30 for emission control having permeability is engaged and fixed in the diffuser 40. Exhaust from an exhaust port 10 provided in a cylinder 2 is introduced through the catalyst 30 into the first expansion chamber 25A, and from the first expansion chamber 25A, it is introduced through an opening 23e formed in the partition panel 23 to the second expansion chamber 25B to be discharged from the second expansion chamber 25B outward through the outlet 29 formed in the front outer wall panel 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、膨張室及び排ガス浄化用触媒を備えたマフラーに係り、特に、刈払機、チェンソー等の携帯型作業機に用いられる小型空冷２サイクルガソリンエンジン等に用いて好適な触媒付きマフラーに関する。   The present invention relates to a muffler provided with an expansion chamber and an exhaust gas purifying catalyst, and more particularly, to a muffler with a catalyst suitable for use in a small air-cooled two-cycle gasoline engine or the like used in a portable working machine such as a brush cutter or a chain saw.

近年、刈払機、チェンソー等の携帯型作業機に使用される小型空冷２サイクルガソリンエンジン等の内燃エンジンおいても、車載用エンジン等と同様に、排ガス中の炭化水素（ＨＣ）、一酸化炭素（ＣＯ）等を低減することが強く要望されてきており、そのため、排気系に備えられるマフラー内に排ガス浄化用触媒を配設し、該触媒に排ガスを通過させることによって排ガスの浄化（ＨＣ、ＣＯ等の低減）を図ることが提案されている。   In recent years, internal combustion engines such as small air-cooled two-cycle gasoline engines used in portable work machines such as brush cutters and chain saws, as well as in-vehicle engines, are used in hydrocarbons (HC) and carbon monoxide in exhaust gas. There has been a strong demand to reduce (CO) and the like, and therefore, an exhaust gas purification catalyst is disposed in a muffler provided in the exhaust system, and exhaust gas is passed through the catalyst to purify exhaust gas (HC, It has been proposed to reduce CO and the like.

このような触媒付きマフラーにおいて、例えば、下記特許文献１等にも見られるように、マフラーの膨張室を仕切パネルで第１膨張室と第２膨張室とに仕切るとともに、前記仕切パネルに排ガス浄化用触媒を前記両膨張室に臨むようにように取り付け、内燃エンジンの排気口から排ガスを前記第１膨張室に噴出させるとともに、前記第１膨張室から排ガスを前記触媒を介して前記第２膨張室に導き、該第２膨張室に設けられた出口を介して外部に排出するようにしたものが知られている。   In such a muffler with a catalyst, for example, as seen in Patent Document 1 below, the muffler expansion chamber is partitioned into a first expansion chamber and a second expansion chamber by a partition panel, and exhaust gas purification is performed in the partition panel. The catalyst is mounted so as to face both the expansion chambers, exhaust gas is ejected from the exhaust port of the internal combustion engine to the first expansion chamber, and exhaust gas is ejected from the first expansion chamber through the catalyst to the second expansion chamber. It is known that it is led to a chamber and discharged to the outside through an outlet provided in the second expansion chamber.

また、前記マフラーのエンジン（のシリンダ）への取り付けは、従来、下記特許文献２等にも見られるように、マフラーを横断貫通し得る程の長さを有する比較的長尺のボルト類を用いて前記マフラー（の外壁パネル）の外側から行うようにされている。   In addition, the mounting of the muffler to the engine (cylinder thereof) has conventionally been performed using relatively long bolts having such a length that can traverse the muffler, as can be seen in Patent Document 2 below. The outside of the muffler (the outer wall panel) is performed.

さらに、最近では、前記仕切パネルに前記触媒を取り付けるのではなく、別途に触媒保持体（ディフューザー）を用意し、このディフューザーに前記触媒を保持固定するようにしたものが考えられている。   Furthermore, recently, instead of attaching the catalyst to the partition panel, a catalyst holding body (diffuser) is separately prepared, and the catalyst is held and fixed to the diffuser.

かかるディフューザーを備えた触媒付きマフラーを図９を参照しながら説明する。図９において、内燃エンジン１’は、刈払機やチェーンソー等の携帯型作業機の動力源として組み込まれているシュニューレ掃気式の小型空冷２サイクルガソリンエンジンとされ、排気量は、例えば約２３〜４５ｍＬ程度のものである。このエンジン１’は、半球形の燃焼室５’を有するシリンダ２’を備え、該シリンダ２’には、その外周に多数の冷却フィン６’が設けられるとともに、内端側から外端側に向けて断面積が漸増する末広がり形状の排気口１０’（断面は、例えば小判形状）が設けられ、さらに、図示はされていないが、周知の態様で吸気口や掃気口が設けられている。   A muffler with a catalyst provided with such a diffuser will be described with reference to FIG. In FIG. 9, the internal combustion engine 1 ′ is a small air-cooled two-cycle gasoline engine of the Schnure scavenging type incorporated as a power source of a portable work machine such as a brush cutter or a chainsaw, and the displacement is about 23 to 45 mL, for example. It is about. The engine 1 'includes a cylinder 2' having a hemispherical combustion chamber 5 '. The cylinder 2' is provided with a large number of cooling fins 6 'on the outer periphery, and from the inner end side to the outer end side. An exhaust port 10 ′ having a divergent shape with a gradually increasing cross-sectional area is provided (the cross section is, for example, an oval shape), and further, although not illustrated, an intake port and a scavenging port are provided in a known manner.

前記シリンダ２’における前記排気口１０’側の外側部に、マフラー２０’が取り付けられている。このマフラー２０’は、はぜ折り加工によって密封接合されている前後の外壁パネル２１’、２２’を備え、これらの外壁パネル２１’、２２’により膨張室２５’が画成されている。前記排気口１０’側に位置する前側外壁パネル２１’には、前記排気口１０’の外端部と略同じ形状の開口部２１ａ’が形成され、この開口部２１ａ’周りには補強板２８’が溶接等により取り付けられている。また、後側外壁パネル２２’における前記排気口１０’の真向かいには、凹部２２ａ’が設けられ、この凹部２２ａ’と前記補強板２８’とを橋絡するように、有底角筒状のディフューザー（触媒保持体）４０’が架設されている。   A muffler 20 'is attached to the outer side of the cylinder 2' on the exhaust port 10 'side. The muffler 20 ′ includes front and rear outer wall panels 21 ′ and 22 ′ which are hermetically joined by a helix folding process, and an expansion chamber 25 ′ is defined by the outer wall panels 21 ′ and 22 ′. An opening 21a ′ having substantially the same shape as the outer end of the exhaust port 10 ′ is formed in the front outer wall panel 21 ′ located on the exhaust port 10 ′ side, and a reinforcing plate 28 is formed around the opening 21a ′. 'Is attached by welding or the like. Further, a recess 22a ′ is provided directly opposite the exhaust port 10 ′ in the rear outer wall panel 22 ′, and a bottomed rectangular tube shape is formed so as to bridge the recess 22a ′ and the reinforcing plate 28 ′. A diffuser (catalyst holder) 40 'is installed.

前記ディフューザー４０’の内端部４１’側（前記排気口１０’側）には、短円柱状の排気浄化用触媒３０’を嵌め込んで溶接等により固定保持するための取付穴４０ａ’が設けられ、前記ディフューザー４０’における外端部４２’側（前記凹部２２ａ’側）には、所要数の排ガス挿通穴４３’が設けられている。前記触媒３０’は、通気性を有するメタル担体酸化触媒とされ、その外周には円筒状のシェル３２’が外装されている。前記触媒３０’は、その中心軸線Ｏが、前記排気口１０’（の外端部）及び前記ディフューザー４０’の中心線と略一致するように、前記ディフューザー４０’に保持されている。   A mounting hole 40a ′ for fitting and holding a short columnar exhaust purification catalyst 30 ′ by welding or the like is provided on the inner end 41 ′ side (the exhaust port 10 ′ side) of the diffuser 40 ′. In addition, a required number of exhaust gas insertion holes 43 ′ are provided on the outer end portion 42 ′ side (the concave portion 22 a ′ side) of the diffuser 40 ′. The catalyst 30 'is a metal carrier oxidation catalyst having air permeability, and a cylindrical shell 32' is packaged on the outer periphery thereof. The catalyst 30 ′ is held by the diffuser 40 ′ so that the center axis O thereof substantially coincides with the exhaust port 10 ′ (outer end portion thereof) and the center line of the diffuser 40 ′.

また、前記後側外壁パネル２２’の下部には、排ガスを外部に排出するための出口２９’が設けられ、この出口２９’には、図示されていないが、金属製のスパークアレスタースクリーン（ＳＡＭスクリーン）や、排ガスの排出方向を規制する排ガス案内部材等が設けられる。   In addition, an outlet 29 ′ for discharging exhaust gas to the outside is provided at the lower portion of the rear outer wall panel 22 ′. The outlet 29 ′ is not shown, but is made of a metal spark arrester screen (SAM). Screen), an exhaust gas guide member for regulating the exhaust gas discharge direction, and the like.

かかる構成のもとでは、前記排気口１０’から音速に近い速度で噴出せしめられる排ガスは、図９において実線矢印で示されているように、前記マフラー２０’内に配在された前記ディフューザー４０’の前記内端部４１’を介して前記触媒３０’に導かれ、その内部を横断通過する。その際、前記触媒３０’により排ガス中のＨＣ、ＣＯ等が低減せしめられる。前記触媒３０’を横断通過した排ガスは、前記ディフューザー４０’の前記排ガス挿通穴４３’を介して前記膨張室２５’内に吹き出されて膨張拡散せしめられ、それによって排気音が減衰せしめられる。前記膨張室２５’で膨張拡散した排ガスは、下部方向に移動し、前記出口２９’を介して外部に排出される。
特開２００１−３１７３２５号公報 特表平９−５０７８９８号公報 Under such a configuration, the exhaust gas ejected from the exhaust port 10 ′ at a speed close to the sound speed is the diffuser 40 disposed in the muffler 20 ′ as indicated by the solid line arrow in FIG. 9. It is guided to the catalyst 30 ′ through the “inner end portion 41 ′” and passes through the inside thereof. At that time, HC, CO and the like in the exhaust gas are reduced by the catalyst 30 '. The exhaust gas that has passed through the catalyst 30 'is blown into the expansion chamber 25' through the exhaust gas insertion hole 43 'of the diffuser 40' to be expanded and diffused, whereby the exhaust sound is attenuated. The exhaust gas expanded and diffused in the expansion chamber 25 ′ moves downward and is discharged to the outside through the outlet 29 ′.
JP 2001-317325 A Japanese National Patent Publication No. 9-507898

しかしながら、前記した従来の触媒付きマフラーでは、膨張室を画成する前後の外壁パネル、仕切パネル、ディフューザー、触媒等の保持固定には、溶接やカッパーブレージングを多用しているので、製造コストが高くなる嫌いがある。   However, the conventional muffler with a catalyst described above is expensive to manufacture because the welding and copper brazing are frequently used to hold and fix the outer wall panel, partition panel, diffuser, catalyst, etc. before and after the expansion chamber. I hate being.

また、前記マフラーのシリンダへの取り付けを、比較的長尺のボルト類を用いて前記マフラー（の外壁パネル）の外側から行うようにされているので、締付固定位置がシリンダから相当離れてしまう。そのため、マフラーの取付安定性、剛性が低くなりやすく、また、ボルト類挿入用の穴等が必要となるので、前記外壁パネル等の構造が複雑となるといった問題もある。   Further, since the attachment of the muffler to the cylinder is performed from the outside of the muffler (the outer wall panel) using relatively long bolts, the tightening fixing position is considerably separated from the cylinder. . As a result, the mounting stability and rigidity of the muffler are likely to be low, and holes for inserting bolts and the like are required, so that the structure of the outer wall panel and the like is complicated.

さらに、図９に示される如くの、ディフューザーを備えたものでは、該ディフューザーに触媒を保持固定するために、前記ディフューザーに取付穴等を設ける必要があるので、構成が複雑になりやすいとともに、図１０に示される如くに、前記触媒３０’の断面形状と前記排気口１０’の開口形状及び前記ディフューザー４０’（の内端部４１’）の断面形状とが異なるので、排ガスは、その大部分が前記触媒３０’の上下方向中央部を通り、前記触媒３０の上下端部付近は排ガスがほとんど通らず、したがって、前記触媒３０’の浄化能力が十分には活用されていないという問題もあった。   Further, in the case of having a diffuser as shown in FIG. 9, it is necessary to provide a mounting hole or the like in the diffuser in order to hold and fix the catalyst to the diffuser. 10, the cross-sectional shape of the catalyst 30 ′ differs from the opening shape of the exhaust port 10 ′ and the cross-sectional shape of the diffuser 40 ′ (inner end portion 41 ′). However, there is a problem that the exhaust gas hardly passes through the upper and lower ends of the catalyst 30 ′, and the purification ability of the catalyst 30 ′ is not fully utilized. .

また、前記後側外壁パネル２２’に設けられている出口２９’に、スパークアレスタースクリーンと排ガス案内部材をビス止めする構成となっているので、部品点数（ビス類）が多くなるとともに、前記出口２９’の位置や形状に制約が課せられ、設計自由度が低いものとなっている。   In addition, since the spark arrester screen and the exhaust gas guide member are screwed to the outlet 29 ′ provided in the rear outer wall panel 22 ′, the number of parts (screws) increases and the outlet Restrictions are imposed on the position and shape of 29 ', and the degree of freedom in design is low.

本発明は、前記した如くの従来の問題に鑑みてなされたもので、その目的とするところは、溶接箇所を低減して製造コストを可及的に抑えることができるとともに、比較的簡素な構成のもとで、長尺のボルト類を使用することなく、シリンダに直接取付固定することができて、取付安定性、剛性等を向上させることができ、さらに、触媒の浄化能力を最大限活用することができるとともに、排ガスの出口の位置や形状の設計自由度を大きくできるようにされた内燃エンジンの触媒付きマフラーを提供することにある。   The present invention has been made in view of the conventional problems as described above. The object of the present invention is to reduce the number of welding points and to suppress the manufacturing cost as much as possible, and to have a relatively simple configuration. Can be mounted and fixed directly to the cylinder without using long bolts, improving the mounting stability and rigidity, etc., and making full use of the purification capacity of the catalyst Another object of the present invention is to provide a muffler with a catalyst for an internal combustion engine that can increase the degree of freedom in designing the position and shape of the exhaust gas outlet.

前記目的を達成すべく、本発明に係る触媒付きマフラーは、基本的には、相互に分離可能なカップ状の前側外壁パネルと後側外壁パネルにより画成された膨張室を有し、該膨張室が前記前側外壁パネルと前記後側外壁パネルとの間に配在された仕切パネルで第１膨張室と第２膨張室とに仕切られ、前記第１膨張室内に有底筒状のディフューザーが配在されるとともに、該ディフューザー内に通気性を有する排ガス浄化用触媒が嵌挿固定され、シリンダに設けられた排気口から噴出せしめられる排ガスを前記触媒を介して前記第１膨張室に導入するとともに、該第１膨張室から前記仕切パネルに形成された開口を介して前記第２膨張室に導き、該第２膨張室から前記前側外壁パネルに形成された出口を介して外部に排出するようにされてなる。   In order to achieve the above-mentioned object, the muffler with catalyst according to the present invention basically has an expansion chamber defined by a cup-shaped front outer wall panel and a rear outer wall panel that are separable from each other. A chamber is partitioned into a first expansion chamber and a second expansion chamber by a partition panel disposed between the front outer wall panel and the rear outer wall panel, and a bottomed cylindrical diffuser is provided in the first expansion chamber. An exhaust gas purifying catalyst having a gas permeability is inserted and fixed in the diffuser, and exhaust gas ejected from an exhaust port provided in the cylinder is introduced into the first expansion chamber via the catalyst. The first expansion chamber is led to the second expansion chamber through an opening formed in the partition panel, and is discharged from the second expansion chamber to the outside through an outlet formed in the front outer wall panel. To be made.

好ましい態様では、前記シリンダの前記排気口周辺部に、前記前側外壁パネルの前端部、前記仕切パネルの前端部、及び、前記ディフューザーの前端に設けられたフランジ部がボルト類により共締め固定される。   In a preferred aspect, a front end portion of the front outer wall panel, a front end portion of the partition panel, and a flange portion provided at the front end of the diffuser are fastened together with bolts around the exhaust port periphery of the cylinder. .

前記触媒は、好ましくは、円柱状あるいは角柱状とされ、前記ディフューザー内に嵌挿されて点溶接により固定される。
前記触媒は、好ましくは、メタル担体酸化触媒とされる。 The catalyst is preferably cylindrical or prismatic, and is inserted into the diffuser and fixed by spot welding.
The catalyst is preferably a metal carrier oxidation catalyst.

他の好ましい態様では、前記仕切パネルに形成された前記開口にスパークアレスタースクリーンが取着される。
さらに別の好ましい態様では、前記前側外壁パネルの後端、前記仕切パネルの後端、及び前記後側外壁パネルの前端には、それぞれ鍔状部が設けられ、それらの鍔状部が順次重ねられて、ボルト類により共締め固定される。 In another preferred embodiment, a spark arrester screen is attached to the opening formed in the partition panel.
In still another preferred aspect, a hook-like portion is provided at each of a rear end of the front outer wall panel, a rear end of the partition panel, and a front end of the rear outer wall panel, and the hook-like portions are sequentially stacked. And fastened together with bolts.

本発明に係る触媒付きマフラーは、相互に分離可能なカップ状の前側外壁パネルと後側外壁パネルにより膨張室を画成するようにされているので、前記後側外壁パネルを前記前側外壁パネルに取り付けて前記膨張室を画成する前においては、前記前側外壁パネルが開口しているので、取付固定用のボルト類を前記前側外壁パネル内に挿入し、シリンダに直接締め付けることができる。そのため、前記取付固定用のボルト類は、短いものでよく、しかも、前記前側外壁パネル、仕切パネル、ディフューザーを、前記短いボルト類で共締めして同時にシリンダに固定することができる。そのため、締付固定位置が従来の長尺のボルト類を使用する場合に比してシリンダ近傍となり、取付安定性、剛性等を向上させることができる。   Since the muffler with catalyst according to the present invention is configured to define an expansion chamber by a cup-shaped front outer wall panel and a rear outer wall panel that are separable from each other, the rear outer wall panel is used as the front outer wall panel. Before the mounting and defining the expansion chamber, the front outer wall panel is open, so that bolts for mounting and fixing can be inserted into the front outer wall panel and directly tightened to the cylinder. Therefore, the fixing bolts may be short, and the front outer wall panel, the partition panel, and the diffuser can be fastened together with the short bolts and simultaneously fixed to the cylinder. Therefore, the tightening and fixing position is near the cylinder as compared with the case where conventional long bolts are used, and the mounting stability, rigidity, and the like can be improved.

また、前側外壁パネル、仕切パネル、ディフューザーを、ボルト類で共締め固定するとともに、触媒をディフューザー内に嵌挿（圧入）して点溶接により固定するようにされているので、従来のものに比して手間のかかる溶接が低減され、その結果、製造コストを抑えることができる。   In addition, the front outer wall panel, partition panel, and diffuser are fastened together with bolts, and the catalyst is fitted (press-fitted) into the diffuser and fixed by spot welding. Thus, time-consuming welding is reduced, and as a result, manufacturing costs can be reduced.

さらに、排ガス浄化用触媒が、好ましくは、円柱状あるいは角柱状とされて、ディフューザー内に嵌挿するようにされているので、触媒の全領域が排ガスの浄化に使用される。そのため、触媒の浄化能力を最大限活用することができ、排ガス浄化性能が格段に向上する。   Furthermore, since the exhaust gas purifying catalyst is preferably formed in a columnar shape or a prismatic shape and is fitted into the diffuser, the entire area of the catalyst is used for purifying the exhaust gas. Therefore, the purification ability of the catalyst can be utilized to the maximum, and the exhaust gas purification performance is greatly improved.

また、前側外壁パネルに排ガスの出口を形成し、それとは別に、仕切パネルに開口を形成し、該開口にスパークアレスタースクリーンを取着するようにされているので、排ガスの出口の位置や形状の設計自由度を大きくできる。   In addition, an exhaust gas outlet is formed in the front outer wall panel, and separately from this, an opening is formed in the partition panel, and a spark arrester screen is attached to the opening. Design freedom can be increased.

以下、本発明の実施形態を図面を参照しながら説明する。
図１は、本発明に係る触媒付きマフラーの一実施形態を、それが適用された内燃エンジンと共に示す概略断面図である。
図１において、内燃エンジン１は、図９に示される従来例のものと同様に、刈払機やチェーンソー等の携帯型作業機の動力源として組み込まれているシュニューレ掃気式の小型空冷２サイクルガソリンエンジンとされ、排気量は、例えば約２３〜４５ｍＬ程度のものである。このエンジン１は、半球形の燃焼室５を有するシリンダ２を備え、該シリンダ２には、その外周に多数の冷却フィン６が設けられるとともに、断面形状が円形ないし小判形で、内端側から外端側に向けて断面積が漸増する末広がり形状（ラッパ状）とされている排気口１０が設けられ、さらに、図示はされていないが、周知の態様で吸気口や掃気口が設けられている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic sectional view showing an embodiment of a muffler with a catalyst according to the present invention together with an internal combustion engine to which the muffler is applied.
In FIG. 1, an internal combustion engine 1 is a Schnure scavenging small air-cooled two-cycle gasoline engine incorporated as a power source for a portable work machine such as a brush cutter or a chain saw, similar to the conventional example shown in FIG. The displacement is about 23 to 45 mL, for example. The engine 1 includes a cylinder 2 having a hemispherical combustion chamber 5. The cylinder 2 is provided with a number of cooling fins 6 on its outer periphery, and has a circular or oval cross-sectional shape from the inner end side. An exhaust port 10 having a divergent shape (trumpet shape) whose cross-sectional area gradually increases toward the outer end side is provided, and further, although not illustrated, an intake port and a scavenging port are provided in a known manner. Yes.

前記シリンダ２における前記排気口１０側の外側部に、本実施形態のマフラー２０が取り付けられている。このマフラー２０は、相互に分離可能なカップ状の前側外壁パネル２１と後側外壁パネル２２により画成された膨張室２５を有し、該膨張室２５が、前記前側外壁パネル２１内に配在されたカップ状の仕切パネル２３で第１膨張室２５Ａと第２膨張室２５Ｂとに仕切られている。   A muffler 20 of the present embodiment is attached to the outer side of the cylinder 2 on the exhaust port 10 side. The muffler 20 has an expansion chamber 25 defined by a cup-shaped front outer wall panel 21 and a rear outer wall panel 22 that are separable from each other, and the expansion chamber 25 is disposed in the front outer wall panel 21. The cup-shaped partition panel 23 is partitioned into a first expansion chamber 25A and a second expansion chamber 25B.

前記排気口１０側に位置する前記前側外壁パネル２１の前端部２１Ａの中央近くには、前記排気口１０の外端部と略同じ寸法形状の開口２１ａが形成されている。この開口２１ａの周りには、該開口２１ａと同じ寸法形状の開口２８ａが形成された平面視角丸付き菱形の補強板２８が点溶接により取付固定されている（図４も参照）。   Near the center of the front end portion 21A of the front outer wall panel 21 located on the exhaust port 10 side, an opening 21a having substantially the same size and shape as the outer end portion of the exhaust port 10 is formed. Around this opening 21a, a diamond-shaped reinforcing plate 28 with a rounded angle in plan view in which an opening 28a having the same size and shape as the opening 21a is formed is fixedly attached by spot welding (see also FIG. 4).

また、前記前側外壁パネル２１の後端には、断面Ｌ形の鍔状部２１ｂが設けられ、この鍔状部２１ｂの四隅には、図４に示される如くに、ボルト挿通穴２１ｃが形成されている。   Further, a flange-shaped portion 21b having an L-shaped cross section is provided at the rear end of the front outer wall panel 21, and bolt insertion holes 21c are formed at the four corners of the flange-shaped portion 21b as shown in FIG. ing.

前記後側外壁パネル２２の前端には、前記前側外壁パネル２１の前記鍔状部２１ｂの内側に嵌合せしめられる断面Ｌ形の鍔状部２２ｂが設けられ、この鍔状部２２ｂの四隅にも、前記前側外壁パネル２１の前記ボルト挿通穴２１ｃに対応してボルト挿通穴２２ｃ（図７参照）が形成されている。   A front end of the rear outer wall panel 22 is provided with a L-shaped flange-shaped portion 22b that is fitted inside the flange-shaped portion 21b of the front outer wall panel 21, and the four corners of the flange-shaped portion 22b are also provided. A bolt insertion hole 22c (see FIG. 7) is formed corresponding to the bolt insertion hole 21c of the front outer wall panel 21.

前記仕切パネル２３の前端部２３Ａの中央近くにも、円形の開口２３ａが形成され、その後端には、図６に示される如くに、前記前側外壁パネル２１の前記鍔状部２１ｂと前記後側外壁パネル２２の前記鍔状部２２ｂとの間に挟まれる鍔状部２３ｂが設けられ、この鍔状部２３ｂの四隅にも、前記前側外壁パネル２１の前記ボルト挿通穴２１ｃと前記後側外壁パネル２２の前記ボルト挿通穴２２ｃに対応してボルト挿通穴２３ｃが形成されている。   A circular opening 23a is also formed near the center of the front end portion 23A of the partition panel 23, and at its rear end, as shown in FIG. 6, the hook-like portion 21b of the front outer wall panel 21 and the rear side A flange-like portion 23b sandwiched between the flange-like portion 22b of the outer wall panel 22 is provided, and the bolt insertion hole 21c of the front-side outer wall panel 21 and the rear-side outer wall panel are also provided at four corners of the flange-like portion 23b. Corresponding to the 22 bolt insertion holes 22 c, bolt insertion holes 23 c are formed.

前記前側外壁パネル２１の前記前端部２１Ａ（の外面）は、前記シリンダ２における前記排気口１０が開口している張出部２Ａに当接せしめられ、前記仕切パネル２３の前記前端部２３Ａ（の外面）は、前記補強板２８に当接せしめられ、前記仕切パネル２３の前記前端部２３Ａ（の内面）には、図２に示される如くの平面視角丸付き菱形の鍔状部４１を有する、有底円筒状のディフューザー４０の前記鍔状部４１が当接せしめられ、前記仕切パネル前端部２３Ａの前記開口２３ａの周囲が密閉される。この場合、前記前側外壁パネル２１（補強板２８）、前記仕切パネル２３、及び前記ディフューザー４０は、前記各開口２１ａ、２８ａ、２３ａの中心線と前記ディフューザー４０の中心軸線Ｏとが一致するように配置される。   The front end portion 21A (the outer surface) of the front outer wall panel 21 is brought into contact with an overhang portion 2A in the cylinder 2 where the exhaust port 10 is open, and the front end portion 23A (of the partition panel 23) The outer surface) is brought into contact with the reinforcing plate 28, and the front end portion 23A (the inner surface) of the partition panel 23 has a rhombic hook-shaped portion 41 with rounded corners as seen in FIG. The flange-like portion 41 of the bottomed cylindrical diffuser 40 is brought into contact, and the periphery of the opening 23a of the partition panel front end portion 23A is sealed. In this case, the front outer wall panel 21 (reinforcing plate 28), the partition panel 23, and the diffuser 40 are arranged such that the center lines of the openings 21a, 28a, and 23a coincide with the center axis O of the diffuser 40. Be placed.

前記前側外壁パネル２１の前記前端部２１Ａ、前記補強板２８、前記仕切パネル２３の前端部２３Ａ、及び、前記ディフューザー４０の前記鍔状部４１には、図２、３、４、６に示される如くに、それぞれ重なるようにボルト挿通穴２１ｄ、２８ｄ、２３ｄ、４１ｄが二箇所ずつ形成されており、それらのボルト挿通穴２１ｄ、２８ｄ、２３ｄ、４１ｄにボルト２６が通されて前記シリンダ２の前記張出部２Ａにねじ込まれており、このボルト２６により、前記前側外壁パネル２１（前記補強板２８）、前記仕切パネル２３、及び前記ディフューザー４０が前記シリンダ２に直接的に共締め固定されている。   The front end 21A of the front outer wall panel 21, the reinforcing plate 28, the front end 23A of the partition panel 23, and the flange 41 of the diffuser 40 are shown in FIGS. Thus, two bolt insertion holes 21d, 28d, 23d, and 41d are formed so as to overlap each other, and the bolt 26 is passed through these bolt insertion holes 21d, 28d, 23d, and 41d, and the cylinder 2 The front outer wall panel 21 (the reinforcing plate 28), the partition panel 23, and the diffuser 40 are directly fastened and fixed to the cylinder 2 by the bolts 26. .

また、図７に示される如くに、前記前側外壁パネル２１の前記鍔状部２１ｂ、前記仕切パネル２３の前記鍔状部２３ｂ、及び前記後側外壁パネル２２の前記鍔状部２２ｂは、順次重ねられて、それらに形成されている前記各ボルト挿通穴２１ｃ、２３ｃ、２２ｃに通されるボルト３７と前記鍔状部２１ｂに溶接で接合されているナット３８とにより、相互に密封状態で共締め固定されている。したがって、前記ボルト３７による締付を緩めることにより、前記前側外壁パネル２１から前記後側外壁パネル２２を簡単に分離することができ、これにより、保守点検等の便宜が図られる。   In addition, as shown in FIG. 7, the flange-shaped portion 21b of the front outer wall panel 21, the flange-shaped portion 23b of the partition panel 23, and the flange-shaped portion 22b of the rear outer wall panel 22 are sequentially stacked. The bolts 37 passed through the bolt insertion holes 21c, 23c, and 22c formed in the bolts 37 and the nuts 38 joined to the flanged portions 21b by welding are tightened together in a sealed state. It is fixed. Therefore, by loosening the tightening by the bolts 37, the rear outer wall panel 22 can be easily separated from the front outer wall panel 21, thereby facilitating maintenance and inspection.

前記ディフューザー４０の前端部４０Ａ側には、円柱状の排気浄化用触媒３０が嵌挿（圧入）されて点溶接（点溶接部４４）により固定され、前記ディフューザー４０における後端部４０Ｂ側の周面部には、排ガス導出穴４３が上下二箇所に設けられている。前記触媒３０は、通気性を有するメタル担体酸化触媒とされ、その外周には円筒状の金属製シェル３２が外装されている。   A cylindrical exhaust purification catalyst 30 is fitted (press-fitted) into the diffuser 40 on the front end portion 40A side and fixed by spot welding (spot weld portion 44), and the diffuser 40 has a periphery on the rear end portion 40B side. Exhaust gas outlet holes 43 are provided in the upper and lower portions on the surface portion. The catalyst 30 is a metal carrier oxidation catalyst having air permeability, and a cylindrical metal shell 32 is provided on the outer periphery thereof.

また、前記前側外壁パネル２１の後端部の一側には、図４、図５に示される如くに、内方に打ち出されたルーバー状の出口２９が形成されており、前記仕切パネル２３の後端部の他側（前記出口２９とは反対側）には、図１、図６に示される如くに、内方に凹む凹み面部２３Ｄが設けられており、この凹み面部２３Ｄには、矩形の開口２３ｅが形成され、この開口２３ｅを覆うようにスパークアレスタースクリーン３５が点溶接等、適宜の取着法により取着されている。なお、前記出口２９の外側には、図示されていないが、排ガスの排出方向を規制する排ガス案内部材等が設けられる。   Further, as shown in FIGS. 4 and 5, a louver-like outlet 29 is formed on one side of the rear end portion of the front outer wall panel 21. As shown in FIG. 1 and FIG. 6, a concave surface portion 23 </ b> D that is recessed inward is provided on the other side of the rear end portion (the side opposite to the outlet 29). A spark arrester screen 35 is attached by an appropriate attachment method such as spot welding so as to cover the opening 23e. Although not shown, an exhaust gas guide member for regulating the exhaust gas discharge direction is provided outside the outlet 29.

かかる構成のもとでは、前記排気口１０から音速に近い速度で噴出せしめられる排ガスは、図１において実線矢印で示されているように、前記前側外壁パネル２１の前記開口２１ａ、前記補強板２８の前記開口２８ａ、及び前記仕切パネル２３の前記開口２３ａを介して前記ディフューザー４０内に導かれ、その中に嵌挿固定された前記触媒３０の内部を横断通過する。その際、該触媒３０により排ガス中のＨＣ、ＣＯ等が低減せしめられる。前記触媒３０を横断通過した排ガスは、前記ディフューザー４０の前記排ガス導出穴４３を介して前記第１膨張室２５Ａに吹き出されて膨張拡散せしめられ、それによって排気音が減衰せしめられる。前記第１膨張室２５で膨張拡散した排ガスは、前記仕切パネル２３に取着された前記スパークアレスタースクリーン３５を介して前記第２膨張室２５Ｂに導出され、この第２膨張室２５Ｂから前記前側外壁パネル２１に形成された前記出口２９を介して外部に排出される。   Under such a configuration, the exhaust gas ejected from the exhaust port 10 at a speed close to the speed of sound is indicated by the solid line arrow in FIG. 1, and the opening 21 a and the reinforcing plate 28 of the front outer wall panel 21. It is guided into the diffuser 40 through the opening 28a and the opening 23a of the partition panel 23, and passes through the inside of the catalyst 30 fitted and fixed therein. At this time, the catalyst 30 reduces HC, CO, etc. in the exhaust gas. The exhaust gas that has passed through the catalyst 30 is blown into the first expansion chamber 25A through the exhaust gas outlet hole 43 of the diffuser 40 to be expanded and diffused, whereby the exhaust sound is attenuated. The exhaust gas expanded and diffused in the first expansion chamber 25 is led out to the second expansion chamber 25B through the spark arrester screen 35 attached to the partition panel 23, and the front outer wall is extended from the second expansion chamber 25B. It is discharged to the outside through the outlet 29 formed in the panel 21.

このような構成とされた本実施形態の触媒付きマフラー２０は、相互に分離可能なカップ状の前側外壁パネル２１と後側外壁パネル２２により膨張室２５を画成するようにされているので、前記後側外壁パネル２２を前記前側外壁パネル２１に取り付けて前記膨張室を画成する前においては、前記前側外壁パネル２１が開口しているので、シリンダ２への取付固定用のボルト２６を容易に前記前側外壁パネル２１内に挿入して締め付けることができる。そのため、前記取付固定用のボルト２６は、ごく短いものでよく、しかも、前記前側外壁パネル２１、仕切パネル２３、ディフューザー４０を、前記短いボルト２６で共締めして同時にシリンダ２に固定することができる。そのため、締付固定位置が従来の長尺のボルト類を使用する場合に比してシリンダ２の近傍となり、取付安定性、剛性等を向上させることができる。   The catalyst-equipped muffler 20 of this embodiment configured as described above is configured to define an expansion chamber 25 by a cup-shaped front outer wall panel 21 and a rear outer wall panel 22 that are separable from each other. Before the rear outer wall panel 22 is attached to the front outer wall panel 21 to define the expansion chamber, the front outer wall panel 21 is open, so that the bolts 26 for fixing the cylinder 2 can be easily attached. It can be inserted into the front outer wall panel 21 and tightened. Therefore, the mounting and fixing bolts 26 may be very short, and the front outer wall panel 21, the partition panel 23, and the diffuser 40 may be fastened together with the short bolts 26 and simultaneously fixed to the cylinder 2. it can. Therefore, the tightening and fixing position is closer to the cylinder 2 than when conventional long bolts are used, and the mounting stability, rigidity, and the like can be improved.

また、前側外壁パネル２１、仕切パネル２３、ディフューザー４０を、ボルト２６で共締め固定するとともに、触媒３０をディフューザー４０内に嵌挿（圧入）して点溶接により固定するようにされているので、従来のものに比して手間のかかる溶接等の作業が低減され、その結果、製造コストを大幅に抑えることができる。   In addition, the front outer wall panel 21, the partition panel 23, and the diffuser 40 are fastened and fixed together with bolts 26, and the catalyst 30 is fitted (press-fitted) into the diffuser 40 and fixed by spot welding. Compared to conventional ones, laborious operations such as welding are reduced, and as a result, manufacturing costs can be greatly reduced.

さらに、触媒３０が、円柱状とされて、排気口１０からの全排ガスを漏れなく受け入れる有底円筒状のディフューザー４０内に嵌挿するようにされているので、触媒３０の全領域が排ガスの浄化に使用される。そのため、触媒３０の浄化能力を最大限活用することができ、排ガス浄化性能が格段に向上する。   Furthermore, since the catalyst 30 has a columnar shape and is fitted into a bottomed cylindrical diffuser 40 that accepts all exhaust gas from the exhaust port 10 without leakage, the entire area of the catalyst 30 is exhaust gas. Used for purification. Therefore, the purification ability of the catalyst 30 can be utilized to the maximum, and the exhaust gas purification performance is greatly improved.

また、前側外壁パネル２１に排ガスの出口２９を形成し、それとは別に、仕切パネル２３に開口２３ｅを形成し、該開口２３ｅにスパークアレスタースクリーン３５を取着するようにされているので、排ガスの出口２９の位置や形状の設計自由度を大きくできる。   In addition, an exhaust gas outlet 29 is formed on the front outer wall panel 21 and, separately from this, an opening 23e is formed in the partition panel 23, and a spark arrester screen 35 is attached to the opening 23e. The degree of freedom in designing the position and shape of the outlet 29 can be increased.

以上、本発明の一実施形態について、詳述したが、本発明は、前記実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱することなく、設計において種々の変更ができるものである。   As mentioned above, although one Embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, In design, without deviating from the mind of this invention described in the claim Various changes can be made.

例えば、前記実施形態では、スパークアレスタースクリーン３５が仕切パネル２３の凹み面部２３Ｄに取り付けられているが、スパークアレスタースクリーン３５の取付位置はそこに限定される訳ではなく、例えば、図８に示される如くに、仕切パネル２３の上面部２３Ｂ等に取り付けてもよい。   For example, in the above-described embodiment, the spark arrester screen 35 is attached to the recessed surface portion 23D of the partition panel 23, but the attachment position of the spark arrester screen 35 is not limited thereto, and is shown in FIG. 8, for example. Similarly, you may attach to the upper surface part 23B etc. of the partition panel 23. FIG.

また、前記実施形態では、有底円筒状のディフューザー４０における後端部４０Ｂ側の上下周面部に排ガス導出穴４３が設けられているが、それに代えて、図８に示される如くに、排ガス導出穴４３を前記ディフューザー４０の底面部４０Ｃに設けてもよい。   Further, in the embodiment, the exhaust gas outlet holes 43 are provided in the upper and lower peripheral surface portions on the rear end portion 40B side in the bottomed cylindrical diffuser 40. Instead, as shown in FIG. The hole 43 may be provided in the bottom surface portion 40 </ b> C of the diffuser 40.

さらに、外壁パネル２２の表面が過度に高温になるのを避けるべく、図８に示される如くに、前記外壁パネル２２の内側に断熱空間３９を形成するように内壁パネル３６を設けてもよい。この場合、前記した前側外壁パネル２１、仕切パネル２３、及び後側外壁パネル２２の各鍔状部２１ｂ、２３ｂ、２２ｂと同様に、前記内壁パネル３６の前端にも鍔状部３６ｂを設け、これを前記仕切パネル２３の鍔状部２３ｂと前記後側外壁パネル２２の鍔状部２２ｂとの間に挟むようにして共締め固定するとよい。   Furthermore, in order to prevent the surface of the outer wall panel 22 from becoming too hot, an inner wall panel 36 may be provided so as to form a heat insulating space 39 inside the outer wall panel 22 as shown in FIG. In this case, like the flanges 21b, 23b, and 22b of the front outer wall panel 21, the partition panel 23, and the rear outer wall panel 22, the flange 36b is provided at the front end of the inner wall panel 36. Is preferably fastened together so as to be sandwiched between the flange-shaped portion 23b of the partition panel 23 and the flange-shaped portion 22b of the rear outer wall panel 22.

また、本発明の触媒付きマフラーは、前記実施形態で使用された空冷２サイクルガソリンエンジン以外の４サイクルエンジン等にも同様に適用できるものである。   Moreover, the muffler with a catalyst of the present invention can be similarly applied to a 4-cycle engine other than the air-cooled 2-cycle gasoline engine used in the embodiment.

さらに、排ガス浄化用触媒も、前記したもの（メタル担体酸化触媒）以外の、発泡成形体、セラミック担体等よりなるものを用いることができる。   Further, as the exhaust gas purifying catalyst, it is possible to use a foamed molded body, a ceramic carrier or the like other than the above (metal carrier oxidation catalyst).

本発明に係る触媒付きマフラーの一実施形態を、それが適用された内燃エンジンと共に示す概略断面図。1 is a schematic cross-sectional view showing an embodiment of a muffler with a catalyst according to the present invention together with an internal combustion engine to which it is applied. 図１に示されるディフューザーの平面図。The top view of a diffuser shown by FIG. 図２のIII−III矢視線に従って排気口周辺部及びディフューザー部分を拡大して示す断面図。Sectional drawing which expands and shows an exhaust-ports peripheral part and a diffuser part according to the III-III arrow line of FIG. 図１に示される前側外壁パネルの平面図。The top view of the front side outer wall panel shown by FIG. 図４のＶ−Ｖ矢視断面図。FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. 図１に示される仕切パネルの平面図。The top view of the partition panel shown by FIG. 図１に示される前後の外壁パネルと仕切パネルとを共締め固定した状態を示す部分断面図。The fragmentary sectional view which shows the state which fastened and fixed the outer wall panel and partition panel before and behind shown by FIG. 図１に示される触媒付きマフラーの変形例を示す概略断面図。The schematic sectional drawing which shows the modification of the muffler with a catalyst shown by FIG. 従来の触媒付きマフラーの一例を、それが適用された内燃エンジンと共に示す概略断面図。The schematic sectional drawing which shows an example of the conventional muffler with a catalyst with the internal combustion engine to which it was applied. 図９のＸ−Ｘ矢視図。XX arrow line view of FIG.

符号の説明Explanation of symbols

１ 内燃エンジン（小型空冷２サイクルガソリンエンジン）
２ シリンダ
１０ 排気口
２０ マフラー
２１ 前側外壁パネル
２１Ａ 前端部
２２ 後側外壁パネル
２３ 仕切パネル
２３Ａ 前端部
２３ｅ 開口
２１ｂ、２２ｂ、２３ｂ…鍔状部
２５ 膨張室
２５Ａ 第１膨張室
２５Ｂ 第２膨張室
２６ ボルト
２９ 出口
３０ 排ガス浄化用触媒
３５ スパークアレスタースクリーン
３７ ボルト
３８ ナット
４０ ディフューザー
４１ フランジ部 1 Internal combustion engine (small air-cooled 2-cycle gasoline engine)
2 Cylinder 10 Exhaust port 20 Muffler 21 Front outer wall panel 21A Front end portion 22 Rear outer wall panel 23 Partition panel 23A Front end portion 23e Opening 21b, 22b, 23b ... bowl-shaped portion 25 expansion chamber 25A first expansion chamber 25B second expansion chamber 26 Bolt 29 Outlet 30 Exhaust gas purification catalyst 35 Spark arrestor screen 37 Bolt 38 Nut 40 Diffuser 41 Flange

Claims (6)

相互に分離可能なカップ状の前側外壁パネル（２１）と後側外壁パネル（２２）により画成された膨張室（２５）を有し、該膨張室（２５）が前記前側外壁パネル（２１）と前記後側外壁パネル（２２）との間に配在された仕切パネル（２３）で第１膨張室（２５Ａ）と第２膨張室（２５Ｂ）とに仕切られ、前記第１膨張室（２５Ａ）内に有底筒状のディフューザー（４０）が配在されるとともに、該ディフューザー（４０）内に通気性を有する排ガス浄化用触媒（３０）が嵌挿固定され、シリンダ（２）に設けられた排気口（１０）から噴出せしめられる排ガスを前記触媒（３０）を介して前記第１膨張室（２５Ａ）に導入するとともに、該第１膨張室（２５Ａ）から前記仕切パネル（２３）に形成された開口（２３ｅ）を介して前記第２膨張室（２５Ｂ）に導き、該第２膨張室（２５Ｂ）から前記前側外壁パネル（２１）に形成された出口（２９）を介して外部に排出するようにされてなる内燃エンジンの触媒付きマフラー。   There is an expansion chamber (25) defined by a cup-shaped front outer wall panel (21) and a rear outer wall panel (22) that are separable from each other, and the expansion chamber (25) is the front outer wall panel (21). And the rear outer wall panel (22) are partitioned into a first expansion chamber (25A) and a second expansion chamber (25B) by a partition panel (23) arranged between the first expansion chamber (25A). ) Is provided with a bottomed cylindrical diffuser (40), and an exhaust gas purifying catalyst (30) having air permeability is fitted and fixed in the diffuser (40). The exhaust gas ejected from the exhaust port (10) is introduced into the first expansion chamber (25A) through the catalyst (30) and formed in the partition panel (23) from the first expansion chamber (25A). The second through the made opening (23e) A muffler with a catalyst for an internal combustion engine, which is led to a tension chamber (25B) and discharged from the second expansion chamber (25B) to the outside through an outlet (29) formed in the front outer wall panel (21). . 前記シリンダ（２）の前記排気口（１０）周辺部に、前記前側外壁パネル（２１）の前端部（２１Ａ）、前記仕切パネル（２３）の前端部（２３Ａ）、及び、前記ディフューザー（４０）の前端に設けられたフランジ部（４１）がボルト類（２６）により共締め固定されていることを特徴とする請求項１に記載の触媒付きマフラー。   At the periphery of the exhaust port (10) of the cylinder (2), the front end portion (21A) of the front outer wall panel (21), the front end portion (23A) of the partition panel (23), and the diffuser (40) The muffler with a catalyst according to claim 1, wherein a flange portion (41) provided at a front end of the muffler is fixed together by bolts (26). 前記触媒（３０）は、円柱状あるいは角柱状とされ、前記ディフューザー（４０）内に嵌挿されて点溶接により固定されていることを特徴とする請求項１又は２に記載の触媒付きマフラー。   The muffler with a catalyst according to claim 1 or 2, wherein the catalyst (30) has a cylindrical shape or a prismatic shape, is fitted into the diffuser (40), and is fixed by spot welding. 前記触媒（３０）は、メタル担体酸化触媒であることを特徴とする請求項１から３のいずれか一項に記載の触媒付きマフラー。   The muffler with a catalyst according to any one of claims 1 to 3, wherein the catalyst (30) is a metal carrier oxidation catalyst. 前記仕切パネル（２３）に形成された前記開口（２３ｅ）にスパークアレスタースクリーン（３５）が取着されていることを特徴とする請求項１から４のいずれか一項に記載の触媒付きマフラー。   The muffler with a catalyst according to any one of claims 1 to 4, wherein a spark arrester screen (35) is attached to the opening (23e) formed in the partition panel (23). 前記前側外壁パネル（２１）の後端、前記仕切パネル（２３）の後端、及び前記後側外壁パネル（２２）の前端には、それぞれ鍔状部（２１ｂ、２３ｂ、２２ｂ）が設けられ、それらの鍔状部（２１ｂ、２３ｂ、２２ｂ）が順次重ねられて、ボルト類（３７、３８）により共締め固定されていることを特徴とする請求項１から５のいずれか一項に記載の触媒付きマフラー。   At the rear end of the front outer wall panel (21), the rear end of the partition panel (23), and the front end of the rear outer wall panel (22), hook-shaped portions (21b, 23b, 22b) are provided, respectively. The hook-shaped portions (21b, 23b, 22b) are sequentially stacked and fixed together by bolts (37, 38), according to any one of claims 1 to 5. Muffler with catalyst.
JP2004231133A 2004-08-06 2004-08-06 Muffler with catalyst for internal combustion engine Expired - Fee Related JP3955293B2 (en)

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DE102005037102A DE102005037102B4 (en) 2004-08-06 2005-08-03 Muffler mounted on a catalytic converter for an internal combustion engine
US11/197,905 US20060026953A1 (en) 2004-08-06 2005-08-05 Catalyst-attached muffler for internal combustion engine

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064223A (en) * 2005-08-31 2007-03-15 Dolmar Gmbh Exhaust gas device for internal combustion engine
JP2009062878A (en) * 2007-09-06 2009-03-26 Kioritz Corp Engine unit
WO2010106955A1 (en) * 2009-03-17 2010-09-23 ヤンマー株式会社 Engine
JP2010216379A (en) * 2009-03-17 2010-09-30 Yanmar Co Ltd Engine
JP2011017314A (en) * 2009-07-10 2011-01-27 Yanmar Co Ltd Exhaust device of multicylinder engine
JP2011196343A (en) * 2010-03-23 2011-10-06 Yanmar Co Ltd Exhaust emission control device
JP2013217378A (en) * 2013-06-24 2013-10-24 Yanmar Co Ltd Engine
JP2014173520A (en) * 2013-03-11 2014-09-22 Honda Motor Co Ltd Muffler with catalytic converter
JP2016142224A (en) * 2015-02-04 2016-08-08 富士重工業株式会社 Exhaust muffler

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10241883B4 (en) * 2002-09-10 2012-06-21 Andreas Stihl Ag & Co. Hand-held implement with a mounting pin for an exhaust silencer
DE202006013382U1 (en) 2006-08-31 2008-01-03 Dolmar Gmbh Multi-shell silencer / Hinderschalenkanal
DE102007038632B4 (en) * 2006-08-31 2021-02-04 Dolmar Gmbh Multi-shell silencer / rear shell duct
EP2094950B1 (en) * 2006-12-22 2013-11-06 Husqvarna AB Exhaust muffler comprising a catalytic converter
US8251173B2 (en) * 2009-07-23 2012-08-28 Briggs & Stratton Corporation Muffler attachment system
WO2012120034A1 (en) * 2011-03-09 2012-09-13 Makita Corporation Muffler for an engine-driven device
JP5915924B2 (en) * 2011-09-21 2016-05-11 日立工機株式会社 Engine and engine working machine
CN104912625A (en) * 2015-06-09 2015-09-16 临沂照华动力机械有限公司 Novel two-stroke gasoline engine silencer
CN108603426A (en) * 2016-01-30 2018-09-28 工机控股株式会社 Engine and engine working rig
DE102016113756A1 (en) * 2016-07-26 2018-02-01 Motorenfabrik Hatz Gmbh & Co Kg Silencer for single-cylinder diesel engine
US11732637B2 (en) * 2020-12-17 2023-08-22 Brp-Rotax Gmbh & Co. Kg Engine assembly for a vehicle having a compressor

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1902160A (en) * 1931-06-29 1933-03-21 Carbon Monoxide Eliminator Cor Method of using oxidation catalysts
DE2638203A1 (en) * 1976-08-25 1978-03-09 Eberspaecher J Exhaust gas silencer for motorised saws - is in two halves flanged together for easy assembly on motor
US5139107A (en) * 1990-12-11 1992-08-18 Kioritz Corporation Exhaust muffler for internal combustion engines
JP2581164Y2 (en) * 1991-03-26 1998-09-21 株式会社共立 Muffler with catalyst
US5521339A (en) * 1994-11-18 1996-05-28 Wci Outdoor Products, Inc. Catalyst muffler system
WO1996025589A1 (en) * 1995-02-14 1996-08-22 Aktiebolaget Electrolux Spark arresting structure
JP3816581B2 (en) * 1996-06-21 2006-08-30 株式会社共立 Muffler for internal combustion engine
JP3930961B2 (en) * 1998-01-27 2007-06-13 株式会社共立 Muffler for internal combustion engine
JP3814081B2 (en) * 1998-06-30 2006-08-23 新ダイワ工業株式会社 Engine muffler
DE19834822A1 (en) * 1998-08-01 2000-02-03 Stihl Maschf Andreas Exhaust silencer with a catalytic converter
JP3517834B2 (en) * 2000-05-08 2004-04-12 株式会社平岡製作所 Engine muffler
US6789644B2 (en) * 2001-11-06 2004-09-14 Hiraoka Manufacturing Co., Ltd. Engine muffler
DE10304326A1 (en) * 2003-02-04 2004-08-12 Andreas Stihl Ag & Co. Kg muffler assembly
US7156202B2 (en) * 2004-04-05 2007-01-02 Mtd Products Inc Method and apparatus for venting exhaust gas from an engine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064223A (en) * 2005-08-31 2007-03-15 Dolmar Gmbh Exhaust gas device for internal combustion engine
JP2009062878A (en) * 2007-09-06 2009-03-26 Kioritz Corp Engine unit
WO2010106955A1 (en) * 2009-03-17 2010-09-23 ヤンマー株式会社 Engine
JP2010216379A (en) * 2009-03-17 2010-09-30 Yanmar Co Ltd Engine
JP2011017314A (en) * 2009-07-10 2011-01-27 Yanmar Co Ltd Exhaust device of multicylinder engine
JP2011196343A (en) * 2010-03-23 2011-10-06 Yanmar Co Ltd Exhaust emission control device
JP2014173520A (en) * 2013-03-11 2014-09-22 Honda Motor Co Ltd Muffler with catalytic converter
JP2013217378A (en) * 2013-06-24 2013-10-24 Yanmar Co Ltd Engine
JP2016142224A (en) * 2015-02-04 2016-08-08 富士重工業株式会社 Exhaust muffler
US9745884B2 (en) 2015-02-04 2017-08-29 Subaru Corporation Exhaust muffler

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US20060026953A1 (en) 2006-02-09
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