EP1643095B1 - Exhaust catalyst mounting structure for motorcycles - Google Patents

Exhaust catalyst mounting structure for motorcycles Download PDF

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Publication number
EP1643095B1
EP1643095B1 EP05017996A EP05017996A EP1643095B1 EP 1643095 B1 EP1643095 B1 EP 1643095B1 EP 05017996 A EP05017996 A EP 05017996A EP 05017996 A EP05017996 A EP 05017996A EP 1643095 B1 EP1643095 B1 EP 1643095B1
Authority
EP
European Patent Office
Prior art keywords
pipe
catalyst
exhaust
muffler
mounting structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05017996A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1643095A1 (en
Inventor
Kenichi Misaki
Jiro Morita
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP1643095A1 publication Critical patent/EP1643095A1/en
Application granted granted Critical
Publication of EP1643095B1 publication Critical patent/EP1643095B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • 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

Definitions

  • the present invention relates to a mounting structure of an exhaust catalyst in an exhaust system on a motorcycle.
  • a type having a structure such that a plurality of exhaust pipes extending from a multi-cylinder engine are collected at a position below the engine, a rear end thereof is connected to a muffler via a joint pipe, a main catalyst is disposed in a sound absorbing chamber in the muffler, and a preheat pipe-shaped catalyst is disposed in the joint pipe (see JP-A-10-103046).
  • JP 08246860 discloses an exhaust catalyst mounting structure in accordance with the preamble of claim 1. There, the position of the catalyst pipe with respect to the motorcycle is not disclosed.
  • JP 59082517 discloses an exhaust catalyst mounting structure in an exhaust system on a motorcycle in which an exhaust pipe extending from an engine to a muffler at a rear of a vehicle body and a catalyst pipe is disposed between a collective pipe and the muffler, wherein the catalyst storage pipe is smaller than the muffler in diameter, and the catalyst storage pipe is disposed at a position overlapped with a rear wheel in side view.
  • a catalyst is provided in a sound absorbing chamber as in the example disclosed, since the shape of the catalyst and the shape of the sound absorbing chamber depend on each other, flexibility in design is lowered. Also, when the catalyst is provided on an exhaust pipe section which is connected to a muffler, since an exhaust pipe passes through a lower portion of a vehicle body, employment of a catalyst having a large capacity in order to improve the efficiency of exhaust emission purification is difficult in view of securement of a minimum ground clearance.
  • an exhaust catalyst mounting structure in an exhaust system on a motorcycle in which an exhaust pipe extending from an engine to a muffler at a rear of a vehicle body and a catalyst pipe is disposed between a collective pipe and the muffler, characterized in that the front end of the catalyst pipe is connected to the collective pipe by a front connecting pipe and the rear end of the catalyst pipe is connected to the muffler by a rear connecting pipe, the catalyst storage pipe is smaller than the muffler in diameter, and the catalyst storage pipe is disposed at a position overlapped with a rear wheel in side view.
  • the catalyst can be disposed without depending on the shape of the muffler.
  • the shape of the muffler can also be determined freely without depending on the catalyst. Therefore, the shape of the catalyst and the shape of the sound absorbing chamber can be determined freely without depending on each other, and hence flexibility in design is increased.
  • the exhaust system including the catalyst pipe can be disposed inside the vehicle body by arranging the catalyst pipe, which is smaller than the muffler in diameter, at a position overlapping with the rear wheel in side view, and hence a relatively large bank angle can be secured.
  • the catalyst pipe is formed into a cylindrical shape, the catalyst of a cylindrical shape is stored therein, and portions connecting the catalyst pipe with respect to the exhaust pipes and the muffler are formed into tapered and enlarged shape.
  • the catalyst pipe and the catalyst can be formed into a simple cylindrical shape, and hence manufacture and structure can be simplified. Also, since the portions connecting the catalyst pipe with respect to the exhaust pipes and the muffler are formed into tapered and enlarged shape, smooth flow of exhaust air is achieved.
  • a plurality of the exhaust pipes are provided and a preheat catalyst is disposed in a collective exhaust pipe unit in which the plurality of the exhaust pipes are collected at a front portion of the vehicle body.
  • the minimum ground clearance of the vehicle can be secured sufficiently, the efficiency of exhaust emission purification of the exhaust catalyst can be increased.
  • the preheat catalyst is disposed below a pivot portion for pivotally supporting a front end of a rear swing arm which supports the rear wheel.
  • the preheat catalyst is disposed below the pivot portion which pivotally supports the front end of the rear swing arm which supports the rear wheel, the preheat catalyst can be disposed at a preferable position of the vehicle body where interference with the rear swing arm can be avoided.
  • the muffler is formed into a non-cylindrical shape.
  • FIG. 1 is a left side view of a vehicle body of a motorcycle to which the invention of the present application is applied.
  • a pair of left and right front forks 2 supporting a front wheel 1 at a lower ends thereof are connected at upper ends to a head pipe 3 so as to be steerably by a handle 4.
  • the head pipe 3 is mounted to front ends of main frames 5.
  • a pair of the left and right main frames 5 extend from the head pipe 3 so as to open rearward, and pivot plates 6 are mounted respectively to rear ends thereof.
  • a pair of the left and right pivot plates 6 are formed substantially into L-shape in side view, and support both ends of a pivot shaft 7 which is provided laterally therebetween.
  • a front end of a rear swing arm 8 is swingably supported by the pivot shaft 7.
  • a rear wheel 9 is supported at rear end of the rear swing arm 8.
  • a water-cooled four-cycle engine 10 of V-shape in fore-and-aft direction is disposed under the main frame 5.
  • the engine 10 is supported by the main frame 5, the pivot plates 6, and a down tube 11 which extends obliquely downward and rearward from the head pipe 3.
  • a pair of left and right stays 12 projecting upward are integrally provided at the respective front end portions of the left and right pivot plates 6, and a rear cushion 13, which constitutes a rear wheel suspension, is connected between the stay 12 and the front upper surface of the rear swing arm 8.
  • Front ends of upper seat rails 14 are mounted to the upper portions of the respective stays 12.
  • a pair of the left and right upper seat rails 14 extend obliquely upward and rearward, respectively, and rear end portions of reinforcing pipe members 15 which extend substantially horizontally are connected to the rear ends thereof.
  • Grab rails 16 are disposed above the reinforcing pipe members 15, and a trunk box 17 is supported on rearward extensions of the grab rails 16.
  • a two-seater seat 18 is disposed in front of the grab rails 16, and is supported on the upper seat rails 14.
  • a rear cover 19 is supported below the seat 18.
  • Reference numeral 19a designates a tail lamp
  • reference numeral 19b designates a side trunk with a relatively large capacity.
  • a pair of left and right lower seat rails 20 are provided below the upper seat rails 14, and respective front ends thereof are connected to the rear portion of the engine 10, and rear ends thereof are connected to the rear ends of the upper seat rails 14.
  • the upper seat rails 14 and the lower seat rails 20 constitute a seat rail.
  • a fuel tank 21 is disposed in front of the seat 18 and above the engine 10, and is supported above the main frames 5 and the pivot plates 6.
  • An air cleaner 22 is integrated inside the front portion of the fuel tank 21, and supplies to a front cylinder 23 and a rear cylinder 24 of the engine 10.
  • a front exhaust pipe 25 and a rear exhaust pipe 26 extend from respective exhaust ports of the front cylinder 23 and the rear cylinder 24, and collected at a position below the engine 10 to constitute a collective pipe 27 and is further connected to a muffler 28 at the rear.
  • the collective pipe 27 is supported by the lower ends of the pivot plates 6, and the muffler 28 is disposed on the side of the rear wheel 9 and is supported by a stay 29 extending downward from the lower seat rail 20.
  • a radiator 30 is supported by the down tube 11 at the front of the front cylinder 23 for water-cooling the front cylinder 23 and the rear cylinder 24.
  • the front portion of the vehicle body is covered by a front cowl 31, and a front end portion 31a covers a head light 32 at the front of the head pipe 3.
  • Front winkers 33 are provided on side surfaces of the front end portion 31a.
  • a wind screen 34 is arranged on top of the front end portion 31a, and is supported by the head pipe 3 via a wind screen supporting stay 35.
  • Reference numeral 36 designates an instrument.
  • Fig. 2 and Fig. 3 are a plan view and a side view of a portion of an exhaust system from the collective pipe 27 to the muffler 28.
  • a catalyst pipe 40 disposed between the collective pipe 27 and the muffler 28 is a catalyst pipe 40.
  • the catalyst pipe 40 has a cylindrical shape, and a publicly known exhaust catalyst 41 having also a cylindrical shape is stored therein.
  • the exhaust catalyst 41 has a relatively large capacity to an extent which can be sufficient for purifying exhaust air.
  • the outer diameter of the catalyst pipe 40 is a size between the collective pipe 27 and the muffler 28, and between a front end of the catalyst pipe 40 and a rear end of the collective pipe 27, and between a rear end of the catalyst pipe 40 and a front end of the muffler 28 are connected by front and rear tapered connecting pipes 42, 43.
  • a diameter when the muffler 28 has a non-cylindrical shape indicates a diameter of a circumscribing circle which can include the entire muffler 28 or a diameter of a circle similar thereto.
  • the respective tapered connecting pipes 42, 43 are opened toward the rear (downstream of exhaust air).
  • the front portion of the collective pipe 27 is bifurcated, which constitutes branches 44a, 44b which are connected to the front exhaust pipe 25 and the rear exhaust pipe 26.
  • the rear portion of the collective pipe 27 is provided with a heat tube 45, and a preheat catalyst 46 is provided therein.
  • the heat tube 45 is positioned below the pivot shaft 7 (see Fig. 2).
  • the preheat catalyst 46 is heated by exhaust air collected into the heat tube 45, and increases exhaust temperature on the downstream side to preheat to activate a catalytic action in the exhaust catalyst 41 sufficiently. Therefore, when compared with the exhaust catalyst 41, the preheat catalyst 46 must only have relatively small capacity, and has a simple cylindrical shape. Reference numerals 47 to 49 in the drawing designate supporting stays.
  • Fig. 4 is an enlarged plan view of a portion including the catalyst pipe 40 and the muffler 28, and Fig. 5 is a side view of the same showing an interior of the muffler 28 as a sound absorber.
  • the muffler 28 is disposed in substantially parallel with a center of the vehicle body, and the catalyst pipe 40, the front tapered connecting pipe 42, and the rear tapered connecting pipe 43 are bent inwardly of the vehicle body so that the front portions thereof are directed toward the center of the vehicle body.
  • the supporting stay 49 is provided on a front upper surface of the muffler 28 so as to be shifted toward the center of the vehicle body.
  • the interior of the muffler 28 is partitioned into three sound absorbing chambers 50-52 in the fore-and-aft direction, and as shown in the drawing with arrows, exhaust air flows from the first sound absorbing chamber 50 through a first connecting pipe 53 and returns into the third sound absorbing chamber 52, then flows through a second connecting pipe 54 and enters into the second sound absorbing chamber 51, and then is discharged from the second sound absorbing chamber 51 via a third connecting pipe 55 to the atmosphere.
  • a rear end portion of the third connecting pipe 55 passes through an end cap 56 and opened toward the atmosphere.
  • the muffler 28 has a double walled pipe structure, and an inner pipe 57 has an air-ventilating structure such as punched metal or the like, and communicates with a clearance 59 defined between the inner pipe 57 and an outer pipe 58.
  • the clearance 59 is filled with sound absorbing material such as glass wool.
  • Fig. 6 is a cross-sectional view taken along a line 6-6 in Fig. 4.
  • the rear end portion of the catalyst pipe 40 has a double walled pipe structure including the rear tapered connecting pipe 43 and the catalyst pipe 40 with the inner side of the rear tapered connecting pipe 43 projected rearward.
  • the rear end portion of the exhaust catalyst 41 stored in the catalyst pipe 40 is partly inserted into the first sound absorbing chamber 50.
  • Fig. 7 is a drawing showing the shape of the rear end portion of the muffler 28 when viewed in the direction indicated by an arrow 7 in Fig. 5, and Fig. 8 is a cross-sectional view taken along a line 8-8 in Fig. 5.
  • the muffler 28 has a non-cylindrical shape, in this embodiment, has a substantially inverted triangular shape, and an inner surface 60 out of three surfaces which constitute the side surface thereof assumes a substantially flat surface extending in substantially parallel with the vertical direction and opposes the side surface of the rear wheel 9.
  • An upper surface 61 also assumes a substantially horizontal flat surface.
  • An outer surface 62 is an inclined surface, and a rear end thereof is inclined toward the center of the vehicle body. Therefore, the cross-sectional shape of the muffler 28 is such that the upper portion is enlarged portion being increased in width outwardly of the vehicle body and the lower end has the narrowest width.
  • the third sound absorbing chamber 52 (the same in other sound absorbing chambers) is a substantially inverted triangular shape, and only the first connecting pipe 53 is disposed in the lower portion thereof, which is the narrowest portion, and the second connecting pipe 54 and the third connecting pipe 55 are disposed in the wider upper portion in juxtaposed arrangement.
  • the third communicating pipe 55 is inclined obliquely downward toward the rear as shown in Fig. 5, so as to be directed toward the center of the vehicle body.
  • the sound absorbing chamber in the muffler 28 assumes a substantially inverted triangular shape
  • the catalyst pipe 40 since the catalyst pipe 40 is located outside the muffler 28, it can be formed into a simple cylindrical shape without depending on the shape of the sound absorbing chamber.
  • the shape of the muffler 28 does not depend on the shape of the exhaust catalyst 41. Therefore, the catalyst pipe 40 and the muffler 28 are designed into any shape, respectively.
  • the preheat catalyst 46 in the collective pipe 27 is also the same. Therefore, flexibility in design increases.
  • the catalyst pipe 40 is connected to the collective pipe 27 via the front tapered connecting pipe 42, and to the muffler 28 via the rear tapered connecting pipe 43, the collective pipe 27, the catalyst pipe 40, and the muffler 28 having different diameters can be connected so as to gradually increase in diameter toward the downstream of exhaust air, and a smooth flow of exhaust air is achieved.
  • the catalyst pipe 40 Since the catalyst pipe 40 is smaller than the muffler 28 in diameter, it can be arranged near the center of the vehicle body without interference with the rear wheel 9 by arranging the same so as to be overlapped with the rear wheel 9 in side view. In this manner, a relatively large bank angle can be secured by reducing the amount of outward projection of the exhaust system including the catalyst storage section by arranging the same inside the vehicle body.
  • the muffler 28 Since the muffler 28 is formed substantially into an inverted triangular shape, and the inner surface 60 assumes the flat surface extending substantially in parallel with the vertical surface, the muffler 28 can be arranged at a position closer to the side surface of the rear wheel 9. Also, since the outer side surface 62 assumes the inclined surface opened upward and outward, the bank angle can be increased as well. By forming the muffler 28 into a non-cylindrical shape as described above, flexibility of the layout such that one or both of slimming of the vehicle body and securement of the bank angle can be achieved simultaneously can be increased.
  • the heat tube 45 is substantially positioned immediately below the pivot shaft 7, it can be arranged near the center of swinging movement of the rear swing arm 8, whereby the preheat catalyst 46 can be positioned at a preferable position in the vehicle body where interference of the rear swing arm 8 is avoided.
  • the non-cylindrical shape of the muffler 28 is not limited to the substantially triangular cross section, but may be various shapes such as an oval shape.
  • the shapes of the exhaust catalyst 41 and the preheat catalyst 46 are not limited to the circular shape, and may be a non-circular shape.
  • the type of the engine is not limited, and the arrangement structure of the exhaust catalyst in the present application can be applied to an exhaust system having one single exhaust pipe with a single cylinder.
  • the invention realizes an arrangement of an exhaust catalyst in which respective shapes of the exhaust catalyst and a muffler are determined so as to avoid interference with respect to each other.
  • a front exhaust pipe 25 and a rear exhaust pipe 26 extending from a front cylinder 23 and a rear cylinder 24 of an engine 10 of a V-shape in the fore-and-aft direction are collected at a collective pipe 27 below the engine 10, and the rear end portion thereof is connected to a cylindrical catalyst pipe 40 disposed at a position overlapped with a rear wheel 9 in side view.
  • a cylindrical exhaust catalyst 41 is stored in the catalyst pipe 40.
  • the catalyst pipe 40 is connected to the collective pipe 27 of small diameter via a front tapered connecting pipe 42, and is connected to a muffler 28 having a substantially inverted triangular cross section with a larger diameter via a rear tapered connecting pipe 43.
EP05017996A 2004-09-30 2005-08-18 Exhaust catalyst mounting structure for motorcycles Expired - Fee Related EP1643095B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004289060A JP4428651B2 (ja) 2004-09-30 2004-09-30 自動２輪車の排気触媒取付構造

Publications (2)

Publication Number Publication Date
EP1643095A1 EP1643095A1 (en) 2006-04-05
EP1643095B1 true EP1643095B1 (en) 2007-06-06

Family

ID=34937963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05017996A Expired - Fee Related EP1643095B1 (en) 2004-09-30 2005-08-18 Exhaust catalyst mounting structure for motorcycles

Country Status (4)

Country Link
EP (1) EP1643095B1 (ja)
JP (1) JP4428651B2 (ja)
DE (1) DE602005001309T2 (ja)
ES (1) ES2287847T3 (ja)

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
DE102005012067A1 (de) * 2005-03-16 2006-10-12 Emitec Gesellschaft Für Emissionstechnologie Mbh Gehäuse für eine Abgasbehandlungskomponente mit Verstärkungshülse
JP4685746B2 (ja) * 2006-11-02 2011-05-18 本田技研工業株式会社 自動二輪車
JP4886547B2 (ja) * 2007-02-23 2012-02-29 日野自動車株式会社 排気浄化装置
AR066653A1 (es) 2007-06-01 2009-09-02 Honda Motor Co Ltd Sistema de escape para motocicletas
JP5022264B2 (ja) * 2008-02-15 2012-09-12 本田技研工業株式会社 自動二輪車
JP2013036422A (ja) * 2011-08-09 2013-02-21 Suzuki Motor Corp 内燃機関の排気管構造
JP2013108376A (ja) * 2011-11-18 2013-06-06 Sakura Kogyo Kk 内燃機関の排気ガス浄化用の触媒装置並びにこれを組み込んだ排気系システム
JP6031244B2 (ja) * 2012-03-28 2016-11-24 本田技研工業株式会社 鞍乗型車両の排気装置
JP5916119B2 (ja) * 2012-06-20 2016-05-11 本田技研工業株式会社 鞍乗り型車両の内燃機関の排気ガス浄化装置
JP6434881B2 (ja) * 2015-09-18 2018-12-05 フタバ産業株式会社 排気管及び排気管の製造方法
JP2017160792A (ja) * 2016-03-07 2017-09-14 サクラ工業株式会社 触媒パイプ並びにその製造方法並びにこの触媒パイプを具えた自動二輪車用マフラー装置
DE112016007276T5 (de) * 2016-09-28 2019-06-13 Honda Motor Co., Ltd. Auspuffvorrichtung für aufsitzsattel-fahrzeug

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JPS5982517A (ja) * 1982-11-01 1984-05-12 Yamaha Motor Co Ltd 自動二輪車等の消音器構造
DE4431484C2 (de) * 1994-09-03 1997-04-17 Eberspaecher J Schalldämpfer mit integrierter Abgasreinigungsstufe
JPH08246861A (ja) * 1995-03-08 1996-09-24 Suzuki Motor Corp 自動二輪車の触媒取付構造
JPH08246860A (ja) * 1995-03-08 1996-09-24 Suzuki Motor Corp 自動二輪車の触媒取付構造

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
JP4428651B2 (ja) 2010-03-10
ES2287847T3 (es) 2007-12-16
DE602005001309T2 (de) 2007-09-20
JP2006104944A (ja) 2006-04-20
EP1643095A1 (en) 2006-04-05
DE602005001309D1 (de) 2007-07-19

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