EP0473081B1 - Dispositif d'épuration de gaz d'échappement - Google Patents

Dispositif d'épuration de gaz d'échappement Download PDF

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Publication number
EP0473081B1
EP0473081B1 EP91114196A EP91114196A EP0473081B1 EP 0473081 B1 EP0473081 B1 EP 0473081B1 EP 91114196 A EP91114196 A EP 91114196A EP 91114196 A EP91114196 A EP 91114196A EP 0473081 B1 EP0473081 B1 EP 0473081B1
Authority
EP
European Patent Office
Prior art keywords
catalyst
plate
exhaust gas
pipe section
disposed
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 - Lifetime
Application number
EP91114196A
Other languages
German (de)
English (en)
Other versions
EP0473081A1 (fr
Inventor
Taketsugu Kume
Mitsuru Tachikawa
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 Co Ltd
Suzuki Motor Corp
Original Assignee
Suzuki Co Ltd
Suzuki Motor Corp
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 Co Ltd, Suzuki Motor Corp filed Critical Suzuki Co Ltd
Publication of EP0473081A1 publication Critical patent/EP0473081A1/fr
Application granted granted Critical
Publication of EP0473081B1 publication Critical patent/EP0473081B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • 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
    • 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
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction

Definitions

  • the present invention relates to an exhaust gas purifying device according to the pre-characterized part of claim 1.
  • Such devices mounted to an engine unit of, for example, a motorcycle.
  • an exhaust system of an engine unit of, for example, a motorcycle an exhaust gas purifying device is used in which the exhaust gas is purified by carrying out oxidation reaction utilizing catalyst contact reaction between unburnt constituents such as and/or harmful constituents such as carbon monoxide and hydrocarbon contained in the exhaust gas and a catalyst.
  • the catalyst is utilized for increasing temperature of an engine exhaust gas to carry out the oxidation reaction.
  • the exhaust gas is purified by the contact of the exhaust gas to the catalyst disposed in a muffler connected to an exhaust gas tube.
  • the muffler of the motorcycle generally comprises an exhaust pipe section and a muffler section
  • DE-A-2942728 A1 discloses a plate member to which a catalyst is applied.
  • the plate member comprises two plates bent in an arcuate manner adjacently to the inner wall of a muffler body and the plates are mounted to the inner wall surface of the muffler body keeping a clearance of 1 to 5 mm with respect to the inner wall surface so that the exhaust gas flowing through the muffler can be brought into contact with the catalyst applied to the plate member.
  • the plates with the catalyst are disposed cylindrically in an assembled state along the inner wall surface of the muffler body adjacently to the inner wall surface thereof and a portion of the exhaust gas to be brought into contact with the catalyst of the plate member has a relatively low temperature in the surrounding portion of a tubular passage. Therefore, it takes much time to increase the temperature to start the catalytic reaction, hence resulting in degradation of an exhaust gas purification performance.
  • a surface temperature of the muffler body increases high because the plates with catalyst are disposed near the surface of the muffler body. As a result, it becomes necessary to take countermeasures against the thermal harmful influences provided from the heated hot surface of the muffler body.
  • EP-A3-0 401 195 discloses a muffler body including a catalyst plate disposed in the central portion in cross section of the exhaust pipe section of the muffler. The plate extends throughout the longitudinal direction of the exhaust pipe section.
  • An object of the present invention is to provide an exhaust gas purifying device capable of improving a catalytic reaction between the engine exhaust gas and the device to enhance the exhaust gas purifying performance and reducing thermal influence on a muffler as well as improving an engine power.
  • the catalyst plate to which a catalyst is applied is disposed near of the exhaust gas section of the muffler, and when the exhaust gas flows flom the engine exhaust port into the muffler, a high temperature portion of the exhaust gas contacts the catalyst. Accordingly, the catalytic reaction promptly and positively starts to thereby enhance the exhaust gas purifying performance. Moreover, since the catalyst plate is, disposed offset from the central portion, an excessive heating of the catalyst plate can be avoided. Due to the distance between the plate and the inner wall surface of the muffler, increasing of the temperature of the muffler surface can be significantly suppressed, resulting in the improvement of the engine output power.
  • the muffler 10 comprises a muffler body 15 including an exhasut pipe section 11 which is connected to an engine exhaust port of the motorcycle and a muffler section 12 coupled with the exhaust pipe section 11.
  • the muffler section 12 has an expansion chamber formed by swelling a portion of the muffler body 15.
  • An exhaust pipe 13 is connected to the downstream side of the muffler section 12, and a silencer 14 is connected to the exhasut pipe 13.
  • the muffler 10 is referred to a muffler located on the left side of the motorcycle body.
  • Fig. 3 is a cross section of the exhaust pipe section 11 of the muffler 10 representing an exhaust gas purifying device according to one embodiment of the present invention.
  • the muffler body 15 of the muffler 10 is formed of a pair of inner and outer halves 15a and 15b, in which the inner body 15a is to be disposed on the side of a mototcycle body and the outer body 15b is to be disposed on the outside.
  • the inner and outer muffler bodies 15a and 15b each has a semicircular cross section and constitutes a cylindrical pipe as the muffler body 15 when mated with each other.
  • a plate 16 to which a catalyst is applied is disposed in the muffler body 15 so that both the side ends of the plate 16 are secured, for example by means of welding, to the joined portions of the inner and outer muffler bodies 15a and 15b along the longitucinal directions of the exhaust pipe section 11.
  • the plate 16 will be called a catalyst plate 16 hereinlater for the sake of convenience.
  • Fig. 3 shows that the catalyst plate 16 is fixedly secured in the vertical direction, as viewed, in the interior of the inner body 15a at a portion offset from the diameter direction of the muffler body 15 within a range of 1/3d to 2/3d (1/3d ⁇ l ⁇ 2/3d), wherein a symbol d is an inner diameter of the muffler body, and this range will be referred to as a central portion hereinlater offset to the side of the inner wall surface of the inner muffler body 15a.
  • Fig. 3 shows a further embodiment according to the present invention, in which the catalyst plate 16 is disposed at the central portion similar to that of Fig. 3, but in the embodiment of Fig. 4, the catalyst plate 16 is provided with a supplementary rib portion 16a at an intermediate portion thereof so as to increase the strength of the catalyst plate 16 as well as to enlarge the surface area of the catalyst.
  • Fig. 4 shows a still further embodiment according to the present invention, in which the catalyst plate 16 of the type shown in Fig. 3 is mounted to each of the inner and outer bodies 15a and 15b in the central portion of the muffler body 15.
  • the catalyst plate 16 of the type shown in Fig. 3 is mounted to each of the inner and outer bodies 15a and 15b in the central portion of the muffler body 15.
  • two catalyst plates are disposed in the central portion, i.e. within the range from 1/3d to 2/3d (d: inner diameter of the muffler body 15), for example, in a centrally symmetrical manner.
  • the total surface area of the catalyst can be increased as well as increasing of the strength.
  • the catalyst plate 16 has a sandwich structure, for example, shown in Fig. 5 as an enlarged fragmental section.
  • the catalyst plate 16 comprises a punched plate 17 arranged centrally of the sandwich structure, coating layers 18 applied on both the sides of the punched plate 17 and catalyst layers 19 applied to the outer surface of the coating layers 18, which are disposed for the purpose of improving a firm connection of the catalyst layers 19 to the outer surfaces of the punched plate 17.
  • the punched plate 17 is utilized for improving the flow of the exhasut gas through punched holes of the plate 17, a blind plate with no holes may be also utilized.
  • the punched plate 17 it is desired to form the punched plate 17 with a stainless steel plate and to form the coating layers 18 by flame coating a ceramic material such as white aluminium material in ceramic state.
  • a ceramic material such as white aluminium material in ceramic state.
  • a catalyst mainly consisting of platinum and rhodium may be preferably utilized.
  • the coating layers 18 may be eliminated.
  • the exhaust gas purifying device of each of the present embodiments will operates as follows.
  • the exhaust gas from the engine exhasut port flowing through the central portion of the exhaust pipe section of the muffler body 15 has a temperature higher than that flowing along the radially peripheral portion thereof.
  • the high-temperature exhaust gas flows through the central portion therein.
  • the catalyst plate is arranged near the central portion of the flow passage, the high-temperature exhaust gas positively comes into contact with the catalyst, i.e. catalyst layers of the catalyst plate, and promptly reacts therewith. Therefore, the catalytic reaction will start promptly and the exhaust gas purification capability can be hence enhanced.
  • Fig. 7 shows that the surface temperature of the muffler body according to the present invention is lower as indicated by the solid line A in comparison with a conventional one indicated by the dotted line B throughout the whole longitudinal length of the muffler.
  • the exhaust gas purifying device is equipped for the muffler disposed on the left side of the motorcycle body, but substantially the same device is disposed to the muffler on the right side of the motorcycle body.
  • the catalyst plate when the catalyst plate is arranged in an offset manner such as shown in Fig. 2 or 3, the catalyst plate will be displaced on the side of the inner wall of the inner body half 15a.

Landscapes

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

Claims (10)

  1. Dispositif d'épuration de gaz d'échappement, en particulier pour un motocycle, dans lequel un gaz d'échappement provenant d'un orifice d'échappement d'un moteur est épuré par un organe muni d'un catalyseur disposé dans un silencieux cylindré 10 muni d'un tronçon de tube d'échappement relié à l'orifice du gaz d'échappement du moteur, caractérisé en ce que des moyens de plaques de catalyseur 16 sur lesquels est appliqué un catalyseur 19 sont disposés de façon à s'étendre selon une direction longitudinale à travers un tronçon de tube d'échappement 11, dans une partie diamétralement décalée par rapport au centre de la section transversale du tronçon du tube d'échappement 11.
  2. Un dispositif selon la revendication 1, dans lequel lesdits moyens de plaques de catalyseur 16 comportent au moins un organe de plaques d'une structure en sandwich comprenant une plaque centrale 17 et des couches de catalyseur 19 disposées sur les deux côtés de surface de la plaque centrale du 17.
  3. Un dispositif selon la revendication 2, dans lequel ladite plaque centrale 17 est une plaque perforée 17 munie d'une pluralité de perforations.
  4. Un dispositif selon les revendications 2 ou 3, dans lequel ladite plaque centrale est une plaque massive.
  5. Un disposition selon l'une quelconque des revendications 2 à 4, dans lequel, ladite plaque centrale 17 comporte une plaque en acier inoxydable et lesdites couches de catalyseur 19 sont principalement constitués de platine et de rhodium.
  6. Un dispositif selon l'une quelconque des revendications 2 à 5, dans lequel des couches de revêtements 18 sont en outre disposées entre la plaque centrale 17 et les couches de catalyseur 19, lesdites couches de revêtement 19 étant formées par revêtement à la flamme d'aluminium blanc à l'état céramique.
  7. Un dispositif selon l'une quelconque des revendications 1 à 6, dans lequel lesdits moyens de plaques de catalyseur sont constitués par un organe unique de plaques catalyseur 16.
  8. Un dispositif selon l'une quelconque des revendications 1 à 7, dans lequel lesdits moyens de plaques de catalyseur 16 sont constitués d'un organe de plaques de catalyseur 16 et sont disposés dans la partie diamétralement centrale du tronçon du tube d'échappement 11, à l'intérieur d'une zone comprise entre 1/3 et 2/3 du diamètre, dans lequel un symbole d désigne le diamètre intérieur du tronçon du tube d'échappement 11, décalé par rapport à la surface intérieure de ce tronçon.
  9. Un disposition selon la revendication 8, dans lequel ledit organe de plaques de catalyseur 16 est muni d'une partie nervurée 16a formée dans sa partie intermédiaire.
  10. Un dispositif selon l'une quelconque des revendications 1 à 6, dans lequel lesdits moyens de plaques de catalyseur comportent deux organes de plaques de catalyseur 16 disposés diamétralement et symétriquement dans la partie diamétralement centrale du tronçon du tube d'échappement 11, dans une zone comprise entre 1/3 d 2/3 d, dans lequel le symbole d désigne le diamètre intérieur du tronçon du tube d'échappement 11, décalé par rapport à la surface intérieure de ce tronçon.
EP91114196A 1990-08-27 1991-08-23 Dispositif d'épuration de gaz d'échappement Expired - Lifetime EP0473081B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP222501/90 1990-08-27
JP2222501A JP2952997B2 (ja) 1990-08-27 1990-08-27 排気ガス浄化装置

Publications (2)

Publication Number Publication Date
EP0473081A1 EP0473081A1 (fr) 1992-03-04
EP0473081B1 true EP0473081B1 (fr) 1994-06-08

Family

ID=16783420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114196A Expired - Lifetime EP0473081B1 (fr) 1990-08-27 1991-08-23 Dispositif d'épuration de gaz d'échappement

Country Status (4)

Country Link
EP (1) EP0473081B1 (fr)
JP (1) JP2952997B2 (fr)
KR (1) KR950004354B1 (fr)
DE (1) DE69102371T2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3089576B2 (ja) * 1992-11-27 2000-09-18 三信工業株式会社 船外機の排気装置
DE9312926U1 (de) * 1993-08-28 1993-10-28 Firma Andreas Stihl, 71336 Waiblingen Katalysator für handgeführte Arbeitsgeräte
JP3257906B2 (ja) * 1994-09-05 2002-02-18 本田技研工業株式会社 エンジンの排気浄化装置
SE505472C2 (sv) * 1995-06-22 1997-09-01 Electrolux Ab Katalysatorljuddämpare för förbränningsmotor i bärbara arbetsredskap t ex motorsåg
DE19524980A1 (de) * 1995-07-08 1997-01-09 Opel Adam Ag Abgasanlage einer Mehrzylinder-Brennkraftmaschine
IN187850B (fr) * 1995-08-16 2002-07-06 Emitec Emissionstechnologie
DE19704689A1 (de) * 1997-02-07 1998-08-13 Emitec Emissionstechnologie Wabenkörper mit im Inneren freiem Querschnittsbereich, insbesondere für Kleinmotoren
US6134885A (en) * 1998-03-16 2000-10-24 Gilbertson; Gary G. Exhaust system tuned for performance with shared wall
JP2001129407A (ja) * 1999-11-09 2001-05-15 Cataler Corp 排気ガス浄化用パイプ形状触媒
CN101900630B (zh) * 2010-07-21 2012-06-20 力帆实业(集团)股份有限公司 摩托车消声器振动检具
JP6034827B2 (ja) * 2014-05-09 2016-11-30 本田技研工業株式会社 鞍乗り型車両の排気装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2658892A1 (de) * 1976-12-24 1978-07-06 Degussa Vorrichtung zur katalytischen reinigung von abgasen
DE2942728A1 (de) * 1979-10-23 1981-05-07 Bremshey Ag, 5650 Solingen Doppelwandige auspuffrohrleitung
FR2633366B1 (fr) * 1988-06-27 1990-10-12 Rosi Ets Tubulure, notamment pour fluides a haute temperature
AT396170B (de) * 1989-06-01 1993-06-25 Laimboeck Franz Auspuffanlage fuer zweitakt-brennkraftmaschinen

Also Published As

Publication number Publication date
DE69102371D1 (de) 1994-07-14
JPH04109022A (ja) 1992-04-10
KR950004354B1 (ko) 1995-04-28
KR920004698A (ko) 1992-03-28
DE69102371T2 (de) 1994-09-29
JP2952997B2 (ja) 1999-09-27
EP0473081A1 (fr) 1992-03-04

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