EP0473081B1 - Exhaust gas purifying device - Google Patents
Exhaust gas purifying device Download PDFInfo
- 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
Links
Images
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.
Description
- 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. - In the prior art, 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. In such conventional exhaust gas purifying device, 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 According to the precharacterized part of
claim 1, 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. - In the construction of the conventional exhaust gas purifying device of the structure described above, however, 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.
- In addition, 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 suferred 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.
- This and other objects can be achieved according to the present invention in accordance with the characterizing part of
claim 1. - Preferred embodiments are defined in the subclaims.
- According to the present invention, 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.
- In the accompanying drawings:
- Fig. 1 is a side view, partially in section, of a muffler provided with an exhaust gas purifying device according to the present invention;
- Figs. 2 to 4 are also sectional views taken along the line II-II of Fig. 1 showing embodiments according to the present invention;
- Fig. 5 is a sectional view in an enlarged scale of a portion of a catalyst plate of the exhaust gas purifying device;
- Fig. 6 is a graph showing a temperature distribution of the exhaust gas in the muffler;
- Fig. 7 is a graph showing the surface temperature of the muffler in accordance with the present invention in comparison with a prior art; and
- Fig. 8 is a graph showing an engine output according to the present invention in comparison with the prior art.
- First, referring to Fig. 1 showing a
muffler 10 of a motorcycle equipped with an exhaust gas purifying device according to the present invention. Themuffler 10 comprises amuffler body 15 including anexhasut pipe section 11 which is connected to an engine exhaust port of the motorcycle and amuffler section 12 coupled with theexhaust pipe section 11. Themuffler section 12 has an expansion chamber formed by swelling a portion of themuffler body 15. Anexhaust pipe 13 is connected to the downstream side of themuffler section 12, and asilencer 14 is connected to theexhasut pipe 13. In this embodiment, themuffler 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 themuffler 10 representing an exhaust gas purifying device according to one embodiment of the present invention. Referring to Fig. 3, themuffler body 15 of themuffler 10 is formed of a pair of inner andouter halves inner body 15a is to be disposed on the side of a mototcycle body and theouter body 15b is to be disposed on the outside. The inner andouter muffler bodies muffler body 15 when mated with each other. Aplate 16 to which a catalyst is applied is disposed in themuffler body 15 so that both the side ends of theplate 16 are secured, for example by means of welding, to the joined portions of the inner andouter muffler bodies exhaust pipe section 11. Theplate 16 will be called acatalyst 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 theinner body 15a at a portion offset from the diameter direction of themuffler 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 theinner 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, thecatalyst plate 16 is provided with asupplementary rib portion 16a at an intermediate portion thereof so as to increase the strength of thecatalyst 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 andouter bodies muffler body 15. Namely, 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. According to this embodiment, the total surface area of the catalyst can be increased as well as increasing of the strength. - With respect to the described preferred embodiments represented by Figs. 2 to 4, the
catalyst plate 16 has a sandwich structure, for example, shown in Fig. 5 as an enlarged fragmental section. - Referring to Fig. 5, the
catalyst plate 16 comprises a punchedplate 17 arranged centrally of the sandwich structure,coating layers 18 applied on both the sides of the punchedplate 17 andcatalyst layers 19 applied to the outer surface of thecoating layers 18, which are disposed for the purpose of improving a firm connection of thecatalyst layers 19 to the outer surfaces of the punchedplate 17. Although the punchedplate 17 is utilized for improving the flow of the exhasut gas through punched holes of theplate 17, a blind plate with no holes may be also utilized. - In a preferred embodiment, it is desired to form the punched
plate 17 with a stainless steel plate and to form thecoating layers 18 by flame coating a ceramic material such as white aluminium material in ceramic state. As thecatalyst 19, it is desired to utilize one for promoting the oxidization reaction to increase the temperature of the exhaust gas, and for this purpose, a catalyst mainly consisting of platinum and rhodium may be preferably utilized. - According to the type of the catalyst, the
coating layers 18 may be eliminated. - The exhaust gas purifying device of each of the present embodiments will operates as follows.
- In general, as shown in Fig. 6, 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. When the exhasut gas flows in themuffler body 15, the high-temperature exhaust gas flows through the central portion therein. According to the present invention, since 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. - Furthermore the temperature of the inner wall surface of the
muffler body 15 is not highly increased by the catalytic reaction. In this viewpoint, 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. - In addition, as shown in Fig. 9, since the surface temperature of the muffler body is less increased, an influence caused by the temperature increasing less effects on the diffuser of the muffler, so that the lowering of the output power becomes less throughout the whole revolution range of the engine as indicated by the solid line C in comparison with the conventional muffler, indicated by the dotted line D.
- In the foregoing embodiment, 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. In this case, 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.
Claims (10)
- An exhaust gas purifying device, specifically for an motorcycle, in which an exhaust gas from an exhaust port of an engine is purified by a member provided with a catalyst disposed in a cylindrical muffler (10) provided with an exhaust pipe section connected to the engine exhaust gas port, characterized in that a catalyst plate means (16) to which a catalyst (19) is applied is disposed so as to extend throughout a longitudinal direction of the exhaust pipe section (11) at a portion diametrically offset from the center in cross section of the exhaust pipe section (11).
- A device according to claim 1, wherein said catalyst plate means (16) includes at least one plate member of a sandwich structure comprising a central plate (17) and catalyst layers (19) disposed on both side surfaces of the central plate (17).
- A device according to claim 2, wherein said central plate (17) is a punched plate (17) provided with a plurality of perforations.
- A device according to claims 2 or 3, wherein said central plate is a solid plate.
- A device according to any one of claims 2 to 4, wherein said central plate (17) comprises a stainless steel plate and said catalyst layers (19) are mainly formed of plutinum and rhodium.
- A device according to any one of claims 2 to 5, wherein coating layers (18) are further disposed between the central plate (17) and the catalyst layers (19), said coating layers (19) being formed by flame coating white aluminium in ceramic state.
- A device according to any one of claims 1 to 6, wherein said catalyst plate means is one single catalyst plate member (16).
- A device according to any one of claims 1 to 7, wherein said catalyst plate means (16) is composed of one catalyst plate member (16) and is disposed in the diametrically central portion of the exhaust pipe section (11) within a range of 1/3d to 2/3d, wherein a symbol d designates an inner diameter of the exhaust pipe section (11), offset from an inner surface thereof.
- A device according to claim 8, wherein said catalyst plate member (16) is provided with a rib portion (16a) formed at an intermediate portion thereof.
- A device according to any one of claims 1 to 6, wherein said catalyst plate means comprises two catalyst plate members (16) disposed diametrically symmetrically in the diametrically central portion of the exhaust pipe section (11) within a range of 1/3d and 2/3 d, wherein a symbol d designates an inner diameter of the exhaust pipe section (11), offset from an inner surface thereof.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2222501A JP2952997B2 (en) | 1990-08-27 | 1990-08-27 | Exhaust gas purification device |
JP222501/90 | 1990-08-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0473081A1 EP0473081A1 (en) | 1992-03-04 |
EP0473081B1 true EP0473081B1 (en) | 1994-06-08 |
Family
ID=16783420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91114196A Expired - Lifetime EP0473081B1 (en) | 1990-08-27 | 1991-08-23 | Exhaust gas purifying device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0473081B1 (en) |
JP (1) | JP2952997B2 (en) |
KR (1) | KR950004354B1 (en) |
DE (1) | DE69102371T2 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3089576B2 (en) * | 1992-11-27 | 2000-09-18 | 三信工業株式会社 | Outboard exhaust system |
DE9312926U1 (en) * | 1993-08-28 | 1993-10-28 | Stihl Maschf Andreas | Catalyst for hand-held tools |
JP3257906B2 (en) * | 1994-09-05 | 2002-02-18 | 本田技研工業株式会社 | Engine exhaust purification device |
SE505472C2 (en) * | 1995-06-22 | 1997-09-01 | Electrolux Ab | Catalytic converter silencer for internal combustion engine in portable work tools eg chainsaw |
DE19524980A1 (en) * | 1995-07-08 | 1997-01-09 | Opel Adam Ag | Exhaust system of a multi-cylinder internal combustion engine |
IN187850B (en) * | 1995-08-16 | 2002-07-06 | Emitec Emissionstechnologie | |
DE19704689A1 (en) * | 1997-02-07 | 1998-08-13 | Emitec Emissionstechnologie | Honeycomb body with a free cross-sectional area inside, especially for small engines |
US6134885A (en) * | 1998-03-16 | 2000-10-24 | Gilbertson; Gary G. | Exhaust system tuned for performance with shared wall |
JP2001129407A (en) * | 1999-11-09 | 2001-05-15 | Cataler Corp | Pipe-shapes catalyst for purifying exhaust gas |
CN101900630B (en) * | 2010-07-21 | 2012-06-20 | 力帆实业(集团)股份有限公司 | Motorcycle muffler vibration detecting tool |
JP6034827B2 (en) * | 2014-05-09 | 2016-11-30 | 本田技研工業株式会社 | Exhaust system for saddle-ride type vehicles |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2658892A1 (en) * | 1976-12-24 | 1978-07-06 | Degussa | DEVICE FOR CATALYTIC CLEANING OF EXHAUST GASES |
DE2942728A1 (en) * | 1979-10-23 | 1981-05-07 | Bremshey Ag, 5650 Solingen | Exhaust pipe for IC engine - has double walled construction with perforated guide blades within to provide silencing |
FR2633366B1 (en) * | 1988-06-27 | 1990-10-12 | Rosi Ets | TUBING, ESPECIALLY FOR HIGH TEMPERATURE FLUIDS |
AT396170B (en) * | 1989-06-01 | 1993-06-25 | Laimboeck Franz | EXHAUST SYSTEM FOR TWO-STROKE COMBUSTION ENGINES |
-
1990
- 1990-08-27 JP JP2222501A patent/JP2952997B2/en not_active Expired - Lifetime
-
1991
- 1991-08-23 EP EP91114196A patent/EP0473081B1/en not_active Expired - Lifetime
- 1991-08-23 DE DE69102371T patent/DE69102371T2/en not_active Expired - Fee Related
- 1991-08-27 KR KR1019910014889A patent/KR950004354B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR920004698A (en) | 1992-03-28 |
JP2952997B2 (en) | 1999-09-27 |
DE69102371T2 (en) | 1994-09-29 |
JPH04109022A (en) | 1992-04-10 |
DE69102371D1 (en) | 1994-07-14 |
EP0473081A1 (en) | 1992-03-04 |
KR950004354B1 (en) | 1995-04-28 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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