WO1996037691A1 - Exhaust emission control device for internal combustion engines - Google Patents

Exhaust emission control device for internal combustion engines Download PDF

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Publication number
WO1996037691A1
WO1996037691A1 PCT/JP1996/001382 JP9601382W WO9637691A1 WO 1996037691 A1 WO1996037691 A1 WO 1996037691A1 JP 9601382 W JP9601382 W JP 9601382W WO 9637691 A1 WO9637691 A1 WO 9637691A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust
carrier
exhaust gas
internal combustion
exhaust pipe
Prior art date
Application number
PCT/JP1996/001382
Other languages
French (fr)
Japanese (ja)
Inventor
Yoshiyasu Uchida
Nobuhiko Itou
Hiroshi Inokawa
Kenjiro Saito
Nobuhiro Shimada
Original Assignee
Honda Giken Kogyo Kabushiki Kaisha
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 Giken Kogyo Kabushiki Kaisha filed Critical Honda Giken Kogyo Kabushiki Kaisha
Priority to EP96914422A priority Critical patent/EP0831211B1/en
Priority to KR1019970706385A priority patent/KR100401948B1/en
Publication of WO1996037691A1 publication Critical patent/WO1996037691A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/24Exhaust 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
    • F01N3/28Construction of catalytic reactors
    • F01N3/2803Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807Metal other than sintered metal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/08Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/009Exhaust 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 having two or more separate purifying devices arranged in series
    • F01N13/0097Exhaust 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 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/24Exhaust 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
    • F01N3/28Construction of catalytic reactors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00Structure or shape of gas passages, pipes or tubes
    • F01N2470/02Tubes being perforated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00Structure or shape of gas passages, pipes or tubes
    • F01N2470/24Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled

Definitions

  • the present invention relates to an improvement in an internal combustion engine, that is, an exhaust gas purification device for purifying exhaust gas discharged from the engine.
  • an “exhaust gas purification device for an internal combustion engine” disclosed in Japanese Patent Application Laid-Open No. 3-85316 and Japanese Patent Application Laid-Open No. 2.
  • An "exhaust gas purifying apparatus for a motorcycle or the like" disclosed in Japanese Patent Application Laid-Open No. 7-221 is known.
  • the “exhaust gas purifying apparatus for an internal combustion engine” disclosed in Japanese Patent Application Laid-Open No. 3-855316 describes the exhaust gas of a small internal combustion engine mounted on a motorcycle or the like.
  • the exhaust pipe 100 is connected to the mouth, and a perforated plate inner pipe 101 extending in the same direction as the exhaust pipe 100 is arranged along the inner wall of the exhaust pipe 100.
  • the carrier 102 containing the catalyst is attached to the wall of the substrate.
  • the “exhaust gas purifying apparatus for a motorcycle or the like” disclosed in Japanese Patent Application Laid-Open No. 4-1287872 is mounted on a motorcycle or the like.
  • An exhaust muffler 110 is connected to the exhaust port of a small internal combustion engine, and a catalyst tube 111 is disposed at the center of the cross section of this exhaust muffler (corresponding to an exhaust pipe) 110. It contains the catalyst 1 1 2.
  • Catalyst 1 1 2 is a catalyst element with a catalytic structure attached to a honeycomb structured catalytic element c
  • the catalyst body 112 consisting of a catalyst element having a honeycomb structure is shown in FIGS. 17 and 18 above.
  • the pressure loss is larger than that of the perforated inner tube 101. Since the flow velocity of the exhaust gas flowing through the exhaust muffler 110 increases at the center of the cross section of the pipe, the pressure loss further increases. For this reason, the pressure loss has a significant effect on the performance of the internal combustion engine, and is a factor that cannot be ignored especially in low-power internal combustion engines such as motorcycles.
  • a thin steel plate supporting a catalyst metal is arranged at a substantially central portion of an exhaust pipe extending from an exhaust port of an internal combustion engine. Therefore, the catalyst metal is arranged at the approximate center of the cross section of the exhaust pipe where the exhaust temperature is high, and the catalyst metal is activated and the exhaust gas purifying action is sufficiently exhibited.
  • a cylindrical body extending in the axial direction of the exhaust pipe is preferable because pressure loss when exhaust gas passes is reduced.
  • the cylindrical body is constituted by a perforated plate, and the upstream side of the exhaust of the cylindrical body be closed.- That is, since the exhaust passes through a number of holes formed in the wall of the cylindrical body, the exhaust is The catalyst comes into contact with the catalyst metal supported on the front and back surfaces of the second carrier.- Therefore, the contact area between the exhaust gas and the catalyst metal is increased, and the action of purifying the exhaust gas is enhanced. Exhaust gas is exhausted almost at the center of the cross section of the exhaust pipe extending from the exhaust port of the engine. A thin steel plate cylinder extending in the axial direction of the tube and carrying a catalyst metal is disposed, and the thin steel tube is supported in the exhaust pipe, and a passage between the thin steel tube and the exhaust pipe is provided.
  • a partition plate was provided to close the. That is, the partition plate partitions the front and rear thereof to regulate the pulsation of the exhaust gas from the internal combustion engine, so that a substantially smooth steady flow is obtained. For this reason, the purification performance of the exhaust gas purification device is enhanced because the purification ability does not fluctuate. In addition, since the thin steel plate cylinder is supported by the partition plate that regulates the pulsation of exhaust gas, a separate support member is not required.
  • the thin-walled steel tube is attached to the exhaust pipe so as to be able to expand and contract in the axial direction, so that the difference in the amount of expansion between the thin-walled steel tube and the exhaust pipe due to thermal expansion is increased. Is absorbed, which is preferable.
  • a first carrier carrying a catalyst metal is disposed along a vicinity of an inner wall surface of an exhaust pipe extending from an exhaust port of the internal combustion engine,
  • the second support carrying the catalyst metal was arranged substantially at the center of the cross section. That is, since the carrier carrying the catalyst metal is disposed both near the inner wall surface of the exhaust pipe and substantially at the center of the cross section, the performance of the internal combustion engine is not adversely affected, and the purification action of the exhaust gas is reduced. Even higher.
  • FIG. 1 is a side view of a motorcycle equipped with an internal combustion engine exhaust gas purification apparatus according to a first embodiment of the present invention
  • FIG. 2 is a side view showing a first embodiment of an exhaust pipe according to the present invention
  • FIG. 3 is a cross-sectional view taken along line A--A in FIG.
  • FIG. 4 is a cross-sectional view taken along the line B--B in FIG.
  • FIG. 5 is a perspective view showing a first embodiment of the second exhaust gas purification apparatus according to the present invention.
  • Fig. 6 is a cross-sectional view taken along line C-C in Fig. 2,
  • FIG. 7 is a sectional view taken along the line D--D in FIG.
  • FIG. 8 is a sectional view taken along line E--E in FIG.
  • FIGS. 9A to 9E are assembly explanatory views showing a first embodiment of the second carrier according to the present invention
  • FIGS. 10 to 10D are diagrams for the first embodiment of the second carrier according to the present invention.
  • FIGS. 11 to 11H are diagrams showing a modification of the support structure for the first embodiment of the second carrier according to the present invention.
  • FIG. 12 is a perspective view of a second exhaust gas purification device according to the second embodiment.
  • FIG. 13 is a sectional view taken along line FF in FIG. 12,
  • FIG. 14 is a diagram showing a modification of the second exhaust gas purification device according to the second embodiment
  • FIG. 15 is a sectional view taken along line GG in FIG.
  • FIGS. 16A to 16E are schematic diagrams of an exhaust gas purification device according to the third embodiment.
  • Figure 17 is a cross-sectional view of a conventional exhaust pipe
  • Fig. 18 is a partial longitudinal side view of a conventional exhaust pipe
  • Figure 19 is a plan view of a conventional exhaust muffler
  • FIG. 20 is a partial cross-sectional perspective view of a conventional exhaust gas purification device
  • FIG. 21 is a longitudinal sectional view showing a conventional structure near a catalyst tube.
  • a motorcycle 1 includes a two-cycle engine (internal combustion engine) 3 near the center of a vehicle body 2, connects an exhaust pipe 5 to an exhaust port 4 of the engine 3, and silences a rear portion of the exhaust device 5. Connect the container 6.
  • FIG. 2 shows an exhaust pipe 5 according to the present invention.
  • the exhaust pipe 5 is made of a thin steel plate and formed in a circular cross section.
  • One end 5a is connected to the exhaust port 4 (see FIG. 1) of the engine 3 by a flange, and the other end 5b is silenced.
  • a vessel 6 (see FIG. 1) is connected by a flange, and a first exhaust gas purification device 10 upstream of the exhaust gas and a second exhaust gas purification device 20 downstream of the exhaust gas are arranged therein.
  • the first exhaust gas purification device 10 is a purification device of the preceding stage
  • the second exhaust gas purification device 20 is a purification device of the subsequent stage.
  • the portion of the exhaust pipe 5 where the second exhaust gas purification device 20 on the exhaust downstream side is arranged has a larger diameter than the other portions:
  • FIG. 3 shows a cross-sectional structure of the first exhaust gas purification device 10.
  • the first exhaust gas purification device 10 is composed of an inner pipe 11 1 arranged in the exhaust pipe 5-
  • the inner pipe 11 is a cylindrical body extending in the same direction as the exhaust pipe 5 along the inner wall of the exhaust pipe 5, and is formed of a thin plate made of a thin steel plate.
  • the inner pipe 11 has one end 11 a of the inner pipe 11 fixed to the exhaust pipe 5 by reversal, and the other end 11 b is capable of extending and contracting in the axial direction with respect to the exhaust pipe 5. Supported by 13 For this reason, the difference in the amount of axial elongation between the exhaust pipe 5 and the inner pipe 11 due to thermal expansion can be absorbed.
  • the inner tube 11 has a catalyst having a noble metal such as platinum or rhodium supported on a wall surface having porosity 11 c (a solution containing a noble metal is attached by coating or the like).
  • the intermediate portion has a size having a gap 5c between itself and the inner tube 11.
  • the exhaust pipe 5 has a half-cylindrical shape divided in the radial direction, and is integrated by welding with the inner pipe 11 incorporated therein.
  • the support member 13 is formed by winding a corrugated plate (corrugated plate) into a cylindrical shape, and fixing the overlapping surface by spot welding, and has a circumferentially corrugated shape. Therefore, the support member 13 can expand and contract in the radial direction with respect to the exhaust pipe 5 by elastic deformation, and can absorb a difference in elongation between the exhaust pipe 5 and the inner pipe 11 due to thermal expansion.
  • the support member 13 is not limited to the above-described configuration including the corrugated plate, and may be, for example, a stainless steel wire braided to form a ring.
  • Reference numerals 14 and 14 denote a pair of protectors divided in the radial direction to cover the exhaust pipe 5 which becomes hot. These protectors 14 and 14 are bolted to a plurality of nuts 15 welded to the outer peripheral surface of the exhaust pipe 5.
  • FIG. 5 shows a second exhaust gas purification apparatus 20 according to the present invention.
  • the second exhaust gas purifying apparatus 20 has a pair of first carriers 21 and 21 arranged along the vicinity of the inner wall surface of the exhaust pipe 5, and a substantially central section of the first carriers 21 and 21.
  • the second carrier 22 is disposed in a portion (approximately the center of the cross section of the exhaust pipe 5), and the first carriers 21, 21 and the second carrier 22 extend in the axial direction of the exhaust pipe 5.
  • the first carriers 21 and 21 are composed of a pair of semi-cylindrical members divided in the radial direction, and the second carriers 22 are composed of straight cylindrical members having a smaller diameter than the first carriers 21 and 21. .
  • the first carriers 21 and 21 and the second carrier 22 are formed of a thin plate made of a thin steel plate.
  • the first carrier 21, 21, and the second carrier 22 each have a noble metal having a catalytic function such as platinum or rhodium supported on a wall surface having a large number of holes (21 a, 22 c). (Including precious metals).
  • the solution is attached by coating or the like):
  • the exhaust pipe 5 has a size having a gap between the first carrier 21 and the first carrier 21.
  • a support for supporting the one end 22 a of the second carrier 22 so as to be able to expand and contract in the axial direction with respect to the exhaust pipe 5 is provided on the exhaust upstream side (left side in the figure) in the exhaust pipe 5.
  • a member 23 is provided.
  • the support member 23 includes a cushion member 24 for inserting and supporting one end 22 a of the second carrier 22, an annular receiving portion 25 for storing the cushion member 24, and the receiving portion.
  • a bracket 26 for fixing the exhaust pipe 5 to the exhaust pipe 5 ; for this reason, a difference in the amount of axial elongation between the exhaust pipe 5 and the second carrier 22 due to thermal expansion is absorbed. it can.
  • a partition plate for supporting the second carrier 22 and closing the passage between the second carrier 22 and the exhaust pipe 5 is provided on the exhaust downstream side (the right side in this figure) in the exhaust pipe 5. 27 are provided.
  • the partition plate 27 made of a thin steel plate end plate (substantially dish-shaped end plate) has a flange 27 a of the partition plate 27 fixed to the exhaust pipe 5 by plug welding.
  • the other end 22 b of the second carrier 22 is inserted into the through hole 27 b and fixed by welding.
  • One end (upstream exhaust side) 22 a of the second carrier 22 is closed by a cap 28.
  • the cushion member 24 is formed by winding a corrugated plate (corrugated plate) into a cylindrical shape and fixing the overlapping surface by spot welding, and has a wavy shape in the circumferential direction. For this reason, the cushion member 24 can expand and contract radially with respect to the exhaust pipe 5 due to elastic deformation, and absorbs a difference in the amount of expansion between the exhaust pipe 5 and the second carrier 22 due to thermal expansion. can do.
  • both ends of the pair of first carriers 21 and 21 are fixed by spot welding near the edges of the exhaust pipe 5 divided in the radial direction.
  • a cap 28 is fitted to one end 22 a of the second carrier 22 in FIG. 9A, and one end 22 a of the second carrier 22 and the edge of the cap 28 are connected in FIG. 9B. Fix by spot welding and close one end 22a.
  • FIG. 9D the receiving portion 25 containing the cushion member 24 (see FIG. 6) is inserted into one end 22a of the second carrier 22, and assembled as shown in FIG. 9E.
  • the second carrier 22 shown in FIG. 9E is positioned in the lower half of the exhaust pipe 5 in a half shape as shown in FIG. 6, and the receiving part 25 is mounted on the bracket 26 fixed in advance. And the upper and lower halves of the exhaust pipe 5 are covered with each other, and the exhaust pipe 5 and the flange 27 a of the partition plate 27 are plug-welded to complete the assembly work.
  • the exhaust gas of the engine flows in from one end 5 a side of the exhaust pipe 5 and passes through the first exhaust gas purification device 10, and the noble metal carried on the inner pipe 11 And reacts therewith and is purified and reaches the second exhaust gas purification device 20.
  • the portion of the exhaust pipe 5 where the second exhaust gas purification device 20 is disposed has a larger diameter than the other portions, and the front and rear sides of the exhaust pipe 5 are partitioned by a partition plate 27 to form an expansion chamber 29 on the exhaust upstream side. .
  • the pulsation of the exhaust gas from the engine 3 is regulated in the expansion chamber 29 to provide a generally smooth steady flow. Therefore, the exhaust gas flows in the direction of the arrow in FIG. 6, and the exhaust gas flowing near the pipe wall of the exhaust pipe 5 comes into contact with the noble metal carried on the first carriers 21 and 21 to react and be purified.
  • the exhaust gas passes through a number of holes 22 c formed in the wall of the second carrier 22, enters the second carrier 22, passes through the other end 22 b, and is exhausted downstream of the exhaust pipe 5. Released to the atmosphere from the side.
  • the exhaust gas passes through the second carrier 22, the exhaust gas contacts and reacts with the noble metal supported on the second carrier 22, and is purified.
  • the exhaust gas passes through a large number of holes 22 c formed in the wall of the second support 22, and comes into contact with the catalyst metal supported on the front and back surfaces of the second support 22.
  • the contact area with the catalyst metal is large, and the catalyst metal exerts a sufficient purifying action.
  • the catalyst in order for the catalyst to fully exhibit its purifying action, the catalyst must be heated to a high temperature. Need to be activated.
  • the temperature of the exhaust gas flowing through the exhaust pipe 5 is high at the center of the cross section of the pipe. Since the second carrier 22 allows relatively high-temperature exhaust gas flowing through the central part of the cross section of the exhaust pipe 5 to pass therethrough in contact with the catalyst metal, the catalyst becomes high in temperature and is sufficiently activated to sufficiently purify the purifying action. Demonstrate. Since the second carrier 22 is made of a perforated plate cylinder, the pressure loss when exhaust gas passes through is small, and the effect on the engine performance is small:
  • the exhaust gas comes into contact with and reacts with the noble metal supported on the first carriers 21 and 21 and the second carrier 22 and is purified, so that the exhaust gas is efficiently purified. Further, since the exhaust gas has a substantially steady flow, the purification performance of the second exhaust gas purification device 20 does not fluctuate and the exhaust gas is efficiently purified.
  • the temperature of the second carrier 22 becomes higher than that of the exhaust pipe 5 due to reaction heat or the like. Since the second carrier 22 has the other end 2 2 b of the second carrier 22 fixed to the exhaust pipe 5 by the partition plate 27, the exhaust pipe 5 and the second carrier 22 are connected with the thermal expansion. When a difference in the amount of elongation occurs between the two, the end 22a extends in the direction of the outline arrow to absorb the difference in the amount of elongation. The difference in the radial elongation between the exhaust pipe 5 and the second carrier 22 is absorbed by the elastic deformation of the cushion member 24.
  • the second carrier 22 has a closed exhaust upstream side, and may have, for example, the configuration shown in FIGS. 10A to 1OD:
  • FIGS. 10A to 10D show modified examples of the second carrier 22 according to the first embodiment.
  • FIG. 10A shows a configuration in which one end 22 a of the second carrier 22 is closed by a perforated plate cap 31 bulging to the exhaust upstream side, and the perforated plate cap 31 is press-molded. It was formed.
  • FIG. 10B shows a configuration in which one end 22 a of the second carrier 22 is flattened to form a cap 32.
  • FIG. 10C shows that a plurality of perforated plate blades are attached to one end 22 a of the second carrier 22 in a spiral shape (windmill shape) in order to increase the exhaust gas passage resistance.
  • the perforated plate blade is configured as a cap 33-FIG. 10D shows one end 22 a of the second carrier 22 as a flat plate-shaped perforated plate cap 3 4 It is a configuration closed by. Instead of attaching a plate-shaped cap 34 made of a perforated plate, one end 22 a itself is bent toward the center of the second carrier 22 to form a plate-shaped cap so as to close the exhaust upstream side.
  • Each of the caps 31, 32, 33, and 34 shown in FIGS. 1OA to 10D has the same operation as that of the first embodiment described above. Since it is made of a perforated plate, the pressure loss due to the provision of the caps 31, 32, 33, 34 can be smaller than that of the first embodiment.
  • the support structure of the second carrier 22 is such that one of the second carriers 22 is supported so as to be able to expand and contract in the axial direction with respect to the exhaust pipe 5 and the other is fixed to the exhaust pipe 5.
  • FIG. 11 to 11H show modified examples of the support structure of the second carrier 22 according to the first embodiment.
  • the exhaust gas flows in the directions of the arrows in these figures, and the one end 22 a of the second carrier 22 extends in the direction of the white arrow due to thermal expansion.
  • one end 22 a of the second carrier 22 extends to the exhaust upstream side of the support member 23, and the one end 22 a It is configured to be closed by a flat cap 28.
  • the support structure of the second carrier 22 shown in FIG. 11B has a configuration in which the exhaust upstream side (the left side in this figure) of the support member 23 is closed by the cap 36. There is a gap between the one end 22 a and the cap 36 that is larger than the amount of expansion of the second carrier 22 due to thermal expansion. In this case, it is not necessary to attach a cap to one end 22a of the second carrier 22:
  • the support structure of the second carrier 22 shown in FIG. 11C has a configuration in which the receiving portion 25 of the support member 23 is longer in the axial direction of the exhaust pipe 5 than the bracket 26-
  • the support structure of the second carrier 22 shown in FIG. 11D has a configuration of one end support in which the second carrier 22 is supported only by the partition plate 27.
  • the support member 37 includes a cushion member 38 that supports the other end 22 b of the second carrier 22 so as to be able to expand and contract in the axial direction of the exhaust pipe 5, and a receiving part 39 that accommodates the cushion member 38.
  • a partition plate 27 for fixing the receiving portion 39 to the exhaust pipe 5.
  • a gap S 2 is provided between the flange 3 9 a of the other end 2 2 b and the receiving portion 3 9, the clearance S 2 is the other end in the range of the clearance S 2 It regulates the amount of movement and elongation of part 22b.
  • FIG. 11E is a modification of the configuration of FIG. 11D, in which the lengths of the cushion member 38 and the receiving portion 39 are shorter than the configuration of FIG. 11D—shown in FIG. 11F.
  • the support structure of the second carrier 22 is such that one end 22 a of the second carrier 22 is fixed to the exhaust pipe 5 with a bracket 41, and the other end 22 b of the second carrier 22 is connected to the exhaust pipe 5. Both ends are supported by a support member 42 so as to be able to expand and contract in the axial direction.
  • the support member 42 includes a cushion member 43 that supports the other end 22 b of the second carrier 22 so as to be able to expand and contract in the axial direction of the exhaust pipe 5, and a receiving part 44 that stores the cushion member 43.
  • the other end 22 b extends downstream of the support member 42 on the exhaust side (left side in this figure).
  • the support structure of the second carrier 22 shown in FIG. 11G is a modified example of the configuration of FIG. 11F, and the cap with cut-and-raised claw 4 5 is provided at one end 22 a of the second carrier 22. By attaching a, the end 22a is closed.
  • FIG. 11H is a modified example of the above cushion members 24, 38, and 43, and has a configuration of a cushion member 48 in which a stainless wire is woven into a ring shape.
  • the support member 46 includes a seat plate 47 wound around the other end 22 b of the second carrier 22, and the seat plate 47 is inserted into the support member 46, and the other end 22 b is inserted in the axial direction of the exhaust pipe 5.
  • the second exhaust gas purification device 50 A first carrier 51 is arranged along the inner wall surface of the exhaust pipe 5, and a second carrier 5 is provided at substantially the center of the cross section of the first carrier 51 (substantially at the center of the cross section of the exhaust pipe 5). 2 are arranged. The first carrier 51 and the second carrier 52 extend in the axial direction of the exhaust pipe 5.
  • the first carrier 51 is formed of a cylindrical body and includes cone portions 51 a and 51 a at both ends in the axial direction. One or both of the cone portions 51 a and 51 a is connected to the exhaust pipe 5. It is fixed by welding.
  • the second carrier 52 is formed of a flat plate, and one or both ends in the longitudinal direction are fixed to the first carrier 51 by welding.
  • the first carrier 51 and the second carrier 52 are formed of a thin steel plate perforated plate.
  • the carrier 51 and the second carrier 52 carry a noble metal having a catalytic function such as platinum or rhodium on a wall surface having a large number of holes 51 c and 52 a, respectively. (Attach by coating etc.)
  • FIG. 13 shows a state where the second carrier 52 made of a flat plate stands in the first carrier 51.
  • the exhaust of the engine flows in the direction of the arrow in this figure, and the exhaust flowing near the pipe wall flows while passing through a number of holes 51 c formed in the wall of the first carrier 51, and passes through a substantially central portion in cross section.
  • the flowing exhaust gas flows while passing through a large number of holes 52 a formed in the wall of the second carrier 52. Therefore, the exhaust gas comes into contact with the noble metal supported on the first carrier 51 and the second carrier 52 to react and be purified.
  • the exhaust gas passes through a large number of holes 52 a formed in the wall of the second carrier 52, and comes into contact with the catalyst metal supported on the front and back surfaces of the second carrier 52.
  • the contact area with the catalyst metal is large, and the catalyst metal exerts a sufficient purifying action.
  • the noble metal carried on the second carrier 52 comes into contact with the relatively high-temperature exhaust gas flowing through the central portion of the cross section of the exhaust pipe 5, so that it becomes high in temperature and is sufficiently activated to sufficiently exert a purifying action.
  • the second exhaust gas purification device 50 having the example configuration may have the configuration shown in FIGS. 14 and 15, for example.
  • FIG. 14 shows a modification of the second exhaust gas purification device 50 according to the second embodiment.
  • the first carrier 51 has a partially circular cross-sectional shape in which a part of the cylindrical body in the radial direction (for example, the lower part in FIG. 14) is cut out.
  • the first carrier 51 contacts the inner wall of the exhaust pipe 5 with the flange portions 51 b and 51 b folded from both edges of the cross section of the broken circle.
  • the second carrier 52 penetrates through the missing circle of the first carrier 51 and is in contact with the inner wall of the exhaust pipe 5.
  • FIGS. 16A to 16E show an outline of an exhaust gas purification apparatus according to a third embodiment of the present invention. ing.
  • the exhaust gas purification device 61 in Fig. 16A is a control valve that has two stages of purification devices, one in front and the other in the exhaust pipe 5, and adjusts the amount of exhaust gas between the upstream purification device and the downstream purification device. (For example, butterfly valve) It has a configuration with 62 interposed.
  • the former purification device has the structure of the first exhaust gas purification device 10 shown in FIG. 3 described above, and the latter purification device has the second exhaust gas purification device shown in FIG. 12 described above. This is the configuration of the device 50.
  • the exhaust gas purifier 63 shown in FIG. 16B has a configuration in which three stages of purifiers are arranged in the exhaust pipe 5 before and after.
  • the purification device in the first stage has the configuration of the first exhaust gas purification device 10 shown in FIG. 3 described above, and the purification device in the middle stage is the second exhaust gas purification device 5 shown in FIG.
  • the purifying device at the subsequent stage has a configuration of an outlet pipe 64 extending into the exhaust pipe 5 from the other end 5 b of the exhaust pipe 5.
  • the outlet pipe 64 is composed of a perforated plate made of a thin steel plate, and carries a noble metal having a catalytic function such as platinum or rhodium on a porous wall (adhesion of a solution containing a noble metal by application or the like). ):
  • the exhaust gas purifying device 65 in FIG. 16C has a configuration in which a carrier 66 extending in the axial direction of the exhaust pipe 5 is arranged at a substantially central portion of the cross section of the exhaust pipe 5.
  • the carrier 66 is a flat plate made of a thin steel plate perforated plate, and has a noble metal having a catalytic function such as platinum or rhodium supported on a wall surface having a large number of holes (a solution containing a noble metal is used).
  • the exhaust gas purifying device 67 shown in Fig. 16D is a modification of the exhaust gas purifying device shown in Fig. 16C above.
  • the carrier 66 is replaced with a corrugated plate instead of a flat plate. Board).
  • the exhaust gas purification device 68 in FIG. 16E has a configuration in which a semi-cylindrical carrier 69 extending in the axial direction of the exhaust pipe 5 and having both axial ends closed is disposed.
  • the carrier 69 has a radially open end 69 a disposed substantially at the center of the cross section of the exhaust pipe 5.
  • the carrier 69 is made of a thin steel plate perforated plate, and carries a noble metal having a catalytic function such as platinum or rhodium on a wall surface having a large number of holes (a solution containing a noble metal is applied by coating or the like).
  • the supports 66 and 69 shown in FIGS. 16C, 16D and 16E are arranged in a multi-staged exhaust pipe 5 shown in FIGS. 16A and 16B. May be applied to purification equipment:
  • the “thin steel plate” supporting the catalyst metal is provided at substantially the center of the cross section of the exhaust pipe 5 or substantially at the center of the cross section of the first carriers 21, 51.
  • the second carrier 2 made of a perforated plate cylindrical body is used in the first embodiment shown in FIGS. 1 to 9 and the modified examples shown in FIGS. 10 and 11.
  • the second carrier 2 made of a perforated plate cylindrical body is used.
  • a second carrier 52 composed of a flat plate made of a plate is constituted, and in the third embodiment shown in FIGS. 16C, 16D and 16E, the second carrier 52 is formed of a perforated flat plate, a corrugated plate, or a half-cylinder Carriers 66 and 69 are constituted.
  • the “thin-walled steel sheet” is not limited to the configuration of each of the above-described embodiments and the modifications thereof, and is not limited to a perforated plate.
  • the shape and size of the holes are arbitrary. Industrial applicability
  • the exhaust gas purifying apparatus for an internal combustion engine has a low exhaust gas temperature by arranging a thin steel plate carrying a catalytic metal at a substantially central portion of a cross section of an exhaust pipe extending from an exhaust port of the internal combustion engine. Since the catalyst metal is arranged approximately at the center of the high cross section, the catalyst metal can be activated to sufficiently exhibit the exhaust gas purifying action, and can be realized at low cost.
  • the thin steel plate is formed into a cylindrical body extending in the axial direction of the exhaust pipe, so that pressure loss when exhaust gas passes through is reduced.
  • the cylindrical body is formed of a perforated plate, and the exhaust upstream side of the cylindrical body is closed, exhaust gas passes through a number of holes formed in the wall of the cylindrical body. Therefore, the exhaust gas comes into contact with the catalyst metal supported on the front and back surfaces of the second carrier. Therefore, the contact area between the exhaust gas and the catalytic metal is increased, and the exhaust gas purifying action is further enhanced.
  • the exhaust gas purifying apparatus for an internal combustion engine comprises a thin steel plate supporting a catalytic metal extending in the axial direction of the exhaust pipe substantially at the center of the cross section of the exhaust pipe extending from the exhaust port of the internal combustion engine.
  • a high exhaust temperature is achieved by disposing a cylindrical body, supporting a thin-walled steel plate in the exhaust pipe, and providing a partition plate that closes the passage between the thin-walled steel cylinder and the exhaust pipe. Since the catalytic metal is arranged at the center of each part, the catalytic metal can be activated to exert its purifying action sufficiently and to reduce costs.
  • the purification ability of the exhaust gas purification device does not fluctuate, and the purification action can be sufficiently exerted. Furthermore, since the thin steel plate cylinder is supported by the partition plate that regulates the pulsation of exhaust gas, a separate support member is not required, and the support configuration is simplified.
  • the thin-walled steel plate cylinder is attached to the exhaust pipe so as to be able to expand and contract in the axial direction, the extension between the cylinder and the exhaust pipe due to thermal expansion is provided. It is easy to absorb the difference in the amount.
  • the exhaust gas purifying apparatus for an internal combustion engine includes a first carrier carrying a catalyst metal disposed along the vicinity of an inner wall surface of an exhaust pipe extending from an exhaust port of the internal combustion engine.
  • the second carrier carrying the catalyst metal is disposed both near the inner wall surface of the exhaust pipe and substantially at the center of the cross section, thus improving the performance of the internal combustion engine.
  • the exhaust gas purifying action can be further enhanced without affecting as much as possible, and the cost can be reduced.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
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  • Health & Medical Sciences (AREA)
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  • Exhaust Silencers (AREA)

Abstract

An exhaust emission control device wherein a thin steel plate (22) carrying catalytic metals is disposed substantially at the central portion of a cross section of an exhaust pipe (5) extending from an exhaust port (4) of an engine (3). Specifically, since the catalytic metals are disposed substantially at the central portion of the cross section of the exhaust pipe (5) which has a high exhaust gas temperature, an exhaust gas controlling action is sufficiently performed and moreover the production cost of the device can be reduced.

Description

明 細 書 . 内燃機関の排気浄化装置 技術芬野  Specification. Exhaust gas purification equipment for internal combustion engines.
本発明は、 内燃機関、 すなわちエンジンから排出される排気ガスを浄化するた めの排気浄化装置の改良に関する。 背景技術  The present invention relates to an improvement in an internal combustion engine, that is, an exhaust gas purification device for purifying exhaust gas discharged from the engine. Background art
従来、 内燃機関の排気浄化装置としては、 例えば日本特許公開平第 3— 8 5 3 1 6号公報に開示されている "内燃機関の排気ガス浄化装置"や日本特許公開平 第 4一 2 8 7 8 2 1号公報に開示されている "自動二輪車等の排気浄化装置" が 知られている。  Conventionally, as an exhaust purification device for an internal combustion engine, for example, an “exhaust gas purification device for an internal combustion engine” disclosed in Japanese Patent Application Laid-Open No. 3-85316 and Japanese Patent Application Laid-Open No. 2. Description of the Related Art An "exhaust gas purifying apparatus for a motorcycle or the like" disclosed in Japanese Patent Application Laid-Open No. 7-221 is known.
上記日本特許公開平第 3— 8 5 3 1 6号公報の "内燃機関の排気ガス浄化装置" は、 図 1 7および図 1 8によれば、 オートバイ等に搭載する小型の内燃機関の排 気口に排気管 1 0 0を連結し、 該排気管 1 0 0の内壁に沿って排気管 1 0 0と同 方向に延びる多孔板製内管 1 0 1を配置し、 該内管 1 0 1の壁面に触媒を含んだ 担体 1 0 2を付着したものである。  According to FIG. 17 and FIG. 18, the “exhaust gas purifying apparatus for an internal combustion engine” disclosed in Japanese Patent Application Laid-Open No. 3-855316 describes the exhaust gas of a small internal combustion engine mounted on a motorcycle or the like. The exhaust pipe 100 is connected to the mouth, and a perforated plate inner pipe 101 extending in the same direction as the exhaust pipe 100 is arranged along the inner wall of the exhaust pipe 100. The carrier 102 containing the catalyst is attached to the wall of the substrate.
上記日本特許公開平第 4一 2 8 7 8 2 1号公報の "自動二輪車等の排気浄化装 置" は、 図 1 9、 図 2 0および図 2 1によれば、 自動二輪車等に搭載する小型の 内燃機関の排気口に排気マフラ 1 1 0を連結し、 この排気マフラ (排気管に相当) 1 1 0の断面中央部に触媒管 1 1 1を配置し、 該触媒管 1 1 1に触媒体 1 1 2を 収納したものである。 触媒体 1 1 2はハニカム構造の触媒エレメントに触媒物質 を付着したものである c According to FIG. 19, FIG. 20 and FIG. 21, the “exhaust gas purifying apparatus for a motorcycle or the like” disclosed in Japanese Patent Application Laid-Open No. 4-1287872 is mounted on a motorcycle or the like. An exhaust muffler 110 is connected to the exhaust port of a small internal combustion engine, and a catalyst tube 111 is disposed at the center of the cross section of this exhaust muffler (corresponding to an exhaust pipe) 110. It contains the catalyst 1 1 2. Catalyst 1 1 2 is a catalyst element with a catalytic structure attached to a honeycomb structured catalytic element c
一般に、 触媒の浄化作用を十分に発揮するためには、 触媒を高温にして活性化 させる必要がある。 しかし、 小型の内燃機関では触媒を活性化する程度に排気温 度を高めることは容易でない: このため、 触媒の温度をできるだけ高める配慮が 求められる。 それには、 排気管を流れる排気の温度は管の断面中央部で高く、 管 壁近くでは相対的に低くなるので、 この点を考慮する必要がある。 しかし、 図 1 7および図 1 8に示されている "内燃機関の排気ガス浄化装置" は、 排気管 1 0 0の内壁に沿って触媒付き内管 1 0 1を配置したものであり、 浄 化作用を十分に発揮することが容易でない- 図 1 9〜図 2 1に示されている "自動二輪車等の排気浄化装置" は、 排気マフ ラ 1 1 0の断面中央部に触媒体 1 1 2を 置しており、 排気温度が比較的高いの で浄化作用を発揮し易い: しかし、 ハニカム構造の触媒エレメン トからなる触媒 体 1 1 2は、 上記図 1 7および図 1 8に示されている多孔板製内管 1 0 1と比べ て圧力損失が大きい。 排気マフラ 1 1 0を流れる排気の流速は管の断面中央部で 高くなるので、 圧力損失は更に大きくなる。 このため、 圧力損失が内燃機関の性 能に与える影響は大きく、 特に、 自動二輪車のような低出力の内燃機関では無視 できない要素である。 また、 ハニカム構造の触媒エレメン トからなる触媒体 1 1 2を触媒管 1 1 1に 納した構成は、 上記図 1 7および図 1 8に示されているよ うに内管 1 0 1を排気篱1 0 0に配置した構成に比べて、 かなりコストが嵩む- 発明の開示 Generally, it is necessary to activate the catalyst at a high temperature in order to sufficiently exert the purifying action of the catalyst. However, it is not easy to raise the exhaust gas temperature to activate the catalyst in a small internal combustion engine: therefore, consideration must be given to raising the temperature of the catalyst as much as possible. To this end, the temperature of the exhaust gas flowing through the exhaust pipe is high at the center of the cross section of the pipe, and relatively low near the pipe wall. However, the “exhaust gas purifying apparatus for an internal combustion engine” shown in FIGS. 17 and 18 has an inner pipe 101 with a catalyst arranged along the inner wall of the exhaust pipe 100, It is not easy to fully demonstrate the effect of gasification-The "exhaust gas purifier for motorcycles and the like" shown in Figs. 19 to 21 is equipped with a catalyst 11 in the center of the cross section of the exhaust muffler 110 2 and the exhaust gas temperature is relatively high, so that it is easy to exhibit purification action. However, the catalyst body 112 consisting of a catalyst element having a honeycomb structure is shown in FIGS. 17 and 18 above. The pressure loss is larger than that of the perforated inner tube 101. Since the flow velocity of the exhaust gas flowing through the exhaust muffler 110 increases at the center of the cross section of the pipe, the pressure loss further increases. For this reason, the pressure loss has a significant effect on the performance of the internal combustion engine, and is a factor that cannot be ignored especially in low-power internal combustion engines such as motorcycles. Further, in the configuration in which the catalyst body 112 composed of the catalyst element having the honeycomb structure is housed in the catalyst tube 111, the inner tube 101 is exhausted as shown in FIGS. 17 and 18 described above. Significantly higher cost than configuration arranged in 100-Disclosure of the invention
本発明の目的は、 ( 1 ) 浄化作用を十分に発揮すること、 (2 ) 内燃機関の性 能に極力影響を与えないこと、 および (3 ) 低コストな内燃機関の排気浄化装置 を提供することにある。  SUMMARY OF THE INVENTION It is an object of the present invention to provide (1) an exhaust purification device for an internal combustion engine which (1) exerts a sufficient purifying action, (2) minimizes the performance of the internal combustion engine, and (3) has a low cost. It is in.
本発明は、 内燃機関の排気口から延びた排気管の断面略中央部に、 触媒金属を 担持した薄肉鋼板を配置するようにした。 従って、 排気管のうち、 排気温度が高 い断面略中央部に触媒金属が配置されることとなり、 触媒金属は活性化して排気 ガスの浄化作用は十分に発揮される。  According to the present invention, a thin steel plate supporting a catalyst metal is arranged at a substantially central portion of an exhaust pipe extending from an exhaust port of an internal combustion engine. Therefore, the catalyst metal is arranged at the approximate center of the cross section of the exhaust pipe where the exhaust temperature is high, and the catalyst metal is activated and the exhaust gas purifying action is sufficiently exhibited.
前記薄肉鋼板としては、 前記排気管の軸方向に延びる筒体とすることにより、 排気が通過する際の圧力損失が小さくなり好ましい-.  As the thin steel plate, a cylindrical body extending in the axial direction of the exhaust pipe is preferable because pressure loss when exhaust gas passes is reduced.
前記筒体は、 多孔板により構成し、 筒体の排気上流側を閉塞することが好まし い- すなわち、 排気は、 筒体の壁に開けられた多数の孔を通過するため、 排気は、 第 2担体の表裏面に担持された触媒金属と接触することとなる- 従って、 排気と 触媒金属との接触面積が大きくなり、 排気ガスの浄化作用が高まることとなる 更に、 本発明は、 内燃機関の排気口から延びた排気管の断面略中央部に、 排気 管の軸方向に延び触媒金属を担持した薄肉鋼板製筒体を配置し、 前記排気管内に、 前記薄肉鋼板製筒体を支持するとともに、 前記薄肉鋼板製筒体と排気管との間の 通路を塞ぐ仕切板を備えるようにした。 すなわち、 仕切板は、 その前後を仕切つ て内燃機関からの排気の脈動を規制し、 概ね滑らかな定常流とする。 このため、 排気浄化装置は、 浄化能力が変動しないので浄化作用が高まる。 また、 排気の脈 動を規制する仕切板で薄肉鋼板製筒体を支持するため、 別異の支持部材は不要と なる。 It is preferable that the cylindrical body is constituted by a perforated plate, and the upstream side of the exhaust of the cylindrical body be closed.- That is, since the exhaust passes through a number of holes formed in the wall of the cylindrical body, the exhaust is The catalyst comes into contact with the catalyst metal supported on the front and back surfaces of the second carrier.- Therefore, the contact area between the exhaust gas and the catalyst metal is increased, and the action of purifying the exhaust gas is enhanced. Exhaust gas is exhausted almost at the center of the cross section of the exhaust pipe extending from the exhaust port of the engine. A thin steel plate cylinder extending in the axial direction of the tube and carrying a catalyst metal is disposed, and the thin steel tube is supported in the exhaust pipe, and a passage between the thin steel tube and the exhaust pipe is provided. A partition plate was provided to close the. That is, the partition plate partitions the front and rear thereof to regulate the pulsation of the exhaust gas from the internal combustion engine, so that a substantially smooth steady flow is obtained. For this reason, the purification performance of the exhaust gas purification device is enhanced because the purification ability does not fluctuate. In addition, since the thin steel plate cylinder is supported by the partition plate that regulates the pulsation of exhaust gas, a separate support member is not required.
前記薄肉鋼板製筒体としては、 前記排気管に対して軸方向に伸縮可能に取付け られるようにすることにより、 熱膨張に伴う薄肉鋼板製筒体と排気管との間の伸 び量の差が吸 されることになり好ましい。  The thin-walled steel tube is attached to the exhaust pipe so as to be able to expand and contract in the axial direction, so that the difference in the amount of expansion between the thin-walled steel tube and the exhaust pipe due to thermal expansion is increased. Is absorbed, which is preferable.
更に、 本発明に係る内燃機関の排気浄化装置は、 該内燃機関の排気口から延び た排気管の内壁面近傍に沿わせて触媒金属を担持した第 1担体を配置し、 該第 1 担体の断面略々中央部に触媒金属を担持した第 2担体を配置するようにした。 す なわち、 排気管の内壁面近傍並びに断面略々中央部の両方に触媒金属を担持した 担体が配置されることとなるので、 内燃機関の性能に悪影響を与えず、 排気ガス の浄化作用がより一層高まる。 図面の簡単な説明  Further, in the exhaust gas purifying apparatus for an internal combustion engine according to the present invention, a first carrier carrying a catalyst metal is disposed along a vicinity of an inner wall surface of an exhaust pipe extending from an exhaust port of the internal combustion engine, The second support carrying the catalyst metal was arranged substantially at the center of the cross section. That is, since the carrier carrying the catalyst metal is disposed both near the inner wall surface of the exhaust pipe and substantially at the center of the cross section, the performance of the internal combustion engine is not adversely affected, and the purification action of the exhaust gas is reduced. Even higher. BRIEF DESCRIPTION OF THE FIGURES
図 1は、 本発明の第 1実施例に係る内燃機関の排気浄化装置を装着した自動二 輪車の側面図、  FIG. 1 is a side view of a motorcycle equipped with an internal combustion engine exhaust gas purification apparatus according to a first embodiment of the present invention,
図 2は、 本発明に係る排気管の第 1実施例を示す側面図、  FIG. 2 is a side view showing a first embodiment of an exhaust pipe according to the present invention,
図 3は、 図 2における A— A線断面図、  FIG. 3 is a cross-sectional view taken along line A--A in FIG.
図 4は、 図 3における B _ B線断面図、  FIG. 4 is a cross-sectional view taken along the line B--B in FIG.
図 5は、 本発明に係る第 2排気浄化装置の第 1実施例を示す斜視図、  FIG. 5 is a perspective view showing a first embodiment of the second exhaust gas purification apparatus according to the present invention,
図 6は、 図 2における C一 C線断面図、  Fig. 6 is a cross-sectional view taken along line C-C in Fig. 2,
図 7は、 図 6における D— D線断面図、  FIG. 7 is a sectional view taken along the line D--D in FIG.
図 8は、 図 6における E— E線断面図、  FIG. 8 is a sectional view taken along line E--E in FIG.
図 9 A〜図 9 Eは、 本発明に係る第 2担体の第 1実施例を示す組立説明図、 図 1 0 〜図1 0 Dは、 本発明に係る第 2担体の第 1実施例に対する変形例を 示す図、 FIGS. 9A to 9E are assembly explanatory views showing a first embodiment of the second carrier according to the present invention, and FIGS. 10 to 10D are diagrams for the first embodiment of the second carrier according to the present invention. Modification Diagram,
図 1 1 〜図1 1 Hは、 本発明に係る第 2担体の第 1実施例に対する支持構造 の変形例を示す図、  FIGS. 11 to 11H are diagrams showing a modification of the support structure for the first embodiment of the second carrier according to the present invention,
図 1 2は、 第 2実施例に係る第 2排気浄化装置の斜視図、  FIG. 12 is a perspective view of a second exhaust gas purification device according to the second embodiment,
図 1 3は、 図 1 2における F— F線断面図、  FIG. 13 is a sectional view taken along line FF in FIG. 12,
図 1 4は、 第 2実施例に係る第 2排気浄化装置の変形例を示す図、  FIG. 14 is a diagram showing a modification of the second exhaust gas purification device according to the second embodiment,
図 1 5は、 図 1 4における G— G線断面図、  FIG. 15 is a sectional view taken along line GG in FIG.
図 1 6 A〜図 1 6 Eは、 第 3実施例に係る排気浄化装置の概要図、  FIGS. 16A to 16E are schematic diagrams of an exhaust gas purification device according to the third embodiment,
図 1 7は、 従来における排気管の横断面図、  Figure 17 is a cross-sectional view of a conventional exhaust pipe,
図 1 8は、 従来における排気管の一部縦断側面図、  Fig. 18 is a partial longitudinal side view of a conventional exhaust pipe,
図 1 9は、 従来における排気マフラの平面図、  Figure 19 is a plan view of a conventional exhaust muffler,
図 2 0は、 従来における排気浄化装置の一部断面斜視図、  FIG. 20 is a partial cross-sectional perspective view of a conventional exhaust gas purification device,
図 2 1は、 従来における触媒管付近の構造を示す縦断面図である。 発明を実施するための最良の形態  FIG. 21 is a longitudinal sectional view showing a conventional structure near a catalyst tube. BEST MODE FOR CARRYING OUT THE INVENTION
本発明の実施例を添付図に基づいて以下に説明する。 先ず、 図 1〜図 9に基づ き第 1実施例を説明する。  An embodiment of the present invention will be described below with reference to the accompanying drawings. First, a first embodiment will be described with reference to FIGS.
図 1において、 自動二輪車 1は、 車体 2中央付近に二サイクル型エンジン (内 燃機関) 3を備え、 該エンジン 3の排気口 4に排気管 5を接続し、 該排気装置 5 の後部に消音器 6を接続してなる。  In FIG. 1, a motorcycle 1 includes a two-cycle engine (internal combustion engine) 3 near the center of a vehicle body 2, connects an exhaust pipe 5 to an exhaust port 4 of the engine 3, and silences a rear portion of the exhaust device 5. Connect the container 6.
図 2には本発明に係る排気管 5が示されている。 該排気管 5は、 薄肉鋼板にて 断面円形状に形成されたものであり、 エンジン 3の排気口 4 (図 1参照) に一端 部 5 aをフランジで連結し、 他端部 5 bに消音器 6 (図 1参照) をフランジで連 結し、 内部に排気上流側の第 1排気浄化装置 1 0及び排気下流側の第 2排気浄化 装置 2 0が配置されている。 第 1排気浄化装置 1 0は前段の浄化装置であり、 第 2排気浄化装置 2 0は後段の浄化装置である。 排気管 5は、 排気下流側の第 2排 気浄化装置 2 0を配置される部分が他の部分よりも大径とされている:  FIG. 2 shows an exhaust pipe 5 according to the present invention. The exhaust pipe 5 is made of a thin steel plate and formed in a circular cross section. One end 5a is connected to the exhaust port 4 (see FIG. 1) of the engine 3 by a flange, and the other end 5b is silenced. A vessel 6 (see FIG. 1) is connected by a flange, and a first exhaust gas purification device 10 upstream of the exhaust gas and a second exhaust gas purification device 20 downstream of the exhaust gas are arranged therein. The first exhaust gas purification device 10 is a purification device of the preceding stage, and the second exhaust gas purification device 20 is a purification device of the subsequent stage. The portion of the exhaust pipe 5 where the second exhaust gas purification device 20 on the exhaust downstream side is arranged has a larger diameter than the other portions:
図 3には、 前記第 1排気浄化装置 1 0の断面構造が示されている。  FIG. 3 shows a cross-sectional structure of the first exhaust gas purification device 10.
第 1排気浄化装置 1 0は、 排気管 5内に配置された内管 1 1からなつている- 該内管 1 1は、 排気管 5の内壁に沿って該排気管 5と同方向に延びる円筒体であ り、 薄肉鋼板製多孔板で構成される。 内管 1 1は、 該内管 1 1の一端部 1 1 aが 排気管 5に溶揆によって固定され、 他端部 1 1 bが排気管 5に対して軸方向に伸 縮可能に支持部材 1 3で支持されている。 このため、 熱膨張に伴う排気管 5と内 管 1 1との間の軸方向の伸び量の差を吸収できる。 The first exhaust gas purification device 10 is composed of an inner pipe 11 1 arranged in the exhaust pipe 5- The inner pipe 11 is a cylindrical body extending in the same direction as the exhaust pipe 5 along the inner wall of the exhaust pipe 5, and is formed of a thin plate made of a thin steel plate. The inner pipe 11 has one end 11 a of the inner pipe 11 fixed to the exhaust pipe 5 by reversal, and the other end 11 b is capable of extending and contracting in the axial direction with respect to the exhaust pipe 5. Supported by 13 For this reason, the difference in the amount of axial elongation between the exhaust pipe 5 and the inner pipe 11 due to thermal expansion can be absorbed.
内管 1 1は、 多孔 1 1 cを有した壁面に、 白金やロジウム等の触媒機能を有す る貴金属が担持されている (貴金属を含んだ溶液を塗布等で付着) : 排気管 5の 中間部は内管 1 1との間に空隙 5 cを有した大きさである。  The inner tube 11 has a catalyst having a noble metal such as platinum or rhodium supported on a wall surface having porosity 11 c (a solution containing a noble metal is attached by coating or the like). The intermediate portion has a size having a gap 5c between itself and the inner tube 11.
図 4において排気管 5は、 径方向に分割された半割円筒状であり、 内管 1 1を 内蔵した状態で溶接にて一体化している。  In FIG. 4, the exhaust pipe 5 has a half-cylindrical shape divided in the radial direction, and is integrated by welding with the inner pipe 11 incorporated therein.
支持部材 1 3は、 波形板 (コルゲート板) を円筒状に巻き、 重ね合わせ面をス ポッ ト溶接にて固定したものであり、 周方向に波形状を有する。 このため、 支持 部材 1 3は弾性変形により、 排気管 5に対して径方向に伸縮可能であり、 熱膨張 に伴う排気管 5と内管 1 1との間の伸び量の差を吸収できる。 支持部材 1 3は、 波形板からなる前記構成に限定されず、 例えば、 ステンレス線材を編み込んでリ ング状に構成したものであってもよい。  The support member 13 is formed by winding a corrugated plate (corrugated plate) into a cylindrical shape, and fixing the overlapping surface by spot welding, and has a circumferentially corrugated shape. Therefore, the support member 13 can expand and contract in the radial direction with respect to the exhaust pipe 5 by elastic deformation, and can absorb a difference in elongation between the exhaust pipe 5 and the inner pipe 11 due to thermal expansion. The support member 13 is not limited to the above-described configuration including the corrugated plate, and may be, for example, a stainless steel wire braided to form a ring.
符号 1 4 , 1 4は高温となる排気管 5を覆うために径方向に分割された 1対の プロテク夕である。 これらのプロテクタ 1 4, 1 4は、 排気管 5の外周面に溶接 された複数のナッ ト 1 5にボルト止めされる。  Reference numerals 14 and 14 denote a pair of protectors divided in the radial direction to cover the exhaust pipe 5 which becomes hot. These protectors 14 and 14 are bolted to a plurality of nuts 15 welded to the outer peripheral surface of the exhaust pipe 5.
図 5には、 本発明に係る第 2排気浄化装置 2 0が示されている。 該第 2排気浄 化装置 2 0は、 排気管 5の内壁面近傍に沿わせた一対の第 1担体 2 1, 2 1を配 置し、 該第 1担体 2 1, 2 1の断面略中央部 (排気管 5の断面略中央部) に第 2 担体 2 2を配置してなり、 第 1担体 2 1, 2 1及び第 2担体 2 2は、 排気管 5の 軸方向に延びている。  FIG. 5 shows a second exhaust gas purification apparatus 20 according to the present invention. The second exhaust gas purifying apparatus 20 has a pair of first carriers 21 and 21 arranged along the vicinity of the inner wall surface of the exhaust pipe 5, and a substantially central section of the first carriers 21 and 21. The second carrier 22 is disposed in a portion (approximately the center of the cross section of the exhaust pipe 5), and the first carriers 21, 21 and the second carrier 22 extend in the axial direction of the exhaust pipe 5.
第 1担体 2 1, 2 1は、 径方向に分割された一対の半円筒体からなり、 第 2担 体 2 2は、 第 1担体 2 1, 2 1よりも小径の直状円筒体からなる。 第 1担体 2 1 , 2 1及び第 2担体 2 2は、 薄肉鋼板製多孔板で構成されている。 第 1担体 2 1, 2 1及び第 2担体 2 2は、 それぞれ多数の孔 (2 1 a, 2 2 c ) を有した壁面に、 白金やロジウム等の触媒機能を有する貴金属が担持されている (貴金属を含んだ 溶液を塗布等で付着) : 排気管 5は第 1担体 2 1, 2 1との間に空隙を有した大 きさである。 The first carriers 21 and 21 are composed of a pair of semi-cylindrical members divided in the radial direction, and the second carriers 22 are composed of straight cylindrical members having a smaller diameter than the first carriers 21 and 21. . The first carriers 21 and 21 and the second carrier 22 are formed of a thin plate made of a thin steel plate. The first carrier 21, 21, and the second carrier 22 each have a noble metal having a catalytic function such as platinum or rhodium supported on a wall surface having a large number of holes (21 a, 22 c). (Including precious metals The solution is attached by coating or the like): The exhaust pipe 5 has a size having a gap between the first carrier 21 and the first carrier 21.
図 6において、 排気管 5内の排気上流側 (この図の左側) には、 第 2担体 2 2 の一端部 2 2 aを排気管 5に対して軸方向に伸縮可能に支持するための支持部材 2 3が備えられている。 該支持部材 2 3ば、 第 2担体 2 2の一端部 2 2 aを挿通 して支持するクッション部材 2 4と、 該クッション部材 2 4を収納する環状の受 け部 2 5と、 該受け部 2 5を排気管 5に固定するブラケッ ト 2 6とを有している ;: このため、 熱膨張に伴う排気管 5と第 2担体 2 2との間の軸方向の伸び量の差を 吸 できる。 In FIG. 6, a support for supporting the one end 22 a of the second carrier 22 so as to be able to expand and contract in the axial direction with respect to the exhaust pipe 5 is provided on the exhaust upstream side (left side in the figure) in the exhaust pipe 5. A member 23 is provided. The support member 23 includes a cushion member 24 for inserting and supporting one end 22 a of the second carrier 22, an annular receiving portion 25 for storing the cushion member 24, and the receiving portion. A bracket 26 for fixing the exhaust pipe 5 to the exhaust pipe 5 ; for this reason, a difference in the amount of axial elongation between the exhaust pipe 5 and the second carrier 22 due to thermal expansion is absorbed. it can.
排気管 5内の排気下流側 (この図の右側) には、 第 2担体 2 2を支持するとと もに、 該第 2担体 2 2と排気管 5との間の通路を塞ぐための仕切板 2 7が備えら れている。 薄肉鋼板製鏡板 (略皿型のエン ドプレート) からなる前記仕切板 2 7 は、 該仕切板 2 7のフランジ部 2 7 aを排気管 5にプラグ溶接にて固定し、 断面 略中央部の貫通孔部 2 7 bに第 2担体 2 2の他端部 2 2 bを挿入し、 且つ溶接に より固定したものである。 第 2担体 2 2の一端部 (排気上流側) 2 2 aは、 キヤ ップ 2 8ににり閉塞されている。  A partition plate for supporting the second carrier 22 and closing the passage between the second carrier 22 and the exhaust pipe 5 is provided on the exhaust downstream side (the right side in this figure) in the exhaust pipe 5. 27 are provided. The partition plate 27 made of a thin steel plate end plate (substantially dish-shaped end plate) has a flange 27 a of the partition plate 27 fixed to the exhaust pipe 5 by plug welding. The other end 22 b of the second carrier 22 is inserted into the through hole 27 b and fixed by welding. One end (upstream exhaust side) 22 a of the second carrier 22 is closed by a cap 28.
図 7において、 クッション部材 2 4は、 波形板 (コルゲート板) を円筒状に巻 き、 重ね合わせ面をスポッ ト溶接にて固定したものであり、 周方向に波形状を有 する。 このため、 クッション部材 2 4は弾性変形により、 排気管 5に対して径方 向に伸縮可能であり、 熱膨張に伴う排気管 5と第 2担体 2 2との間の伸び量の差 を吸 することができる。  In FIG. 7, the cushion member 24 is formed by winding a corrugated plate (corrugated plate) into a cylindrical shape and fixing the overlapping surface by spot welding, and has a wavy shape in the circumferential direction. For this reason, the cushion member 24 can expand and contract radially with respect to the exhaust pipe 5 due to elastic deformation, and absorbs a difference in the amount of expansion between the exhaust pipe 5 and the second carrier 22 due to thermal expansion. can do.
図 8において、 一対の第 1担体 2 1, 2 1の各両端部は、 径方向に分割された 排気管 5の縁部近傍にスポッ ト溶接にて固定される。  In FIG. 8, both ends of the pair of first carriers 21 and 21 are fixed by spot welding near the edges of the exhaust pipe 5 divided in the radial direction.
次に、 上記構成の第 2担体 2 2の組立手順を図 6及び図 9 A〜図 9 Eに基づき 説明する。  Next, a procedure for assembling the second carrier 22 having the above configuration will be described with reference to FIG. 6 and FIGS. 9A to 9E.
先ず、 図 9 Aにおいて第 2担体 2 2の一端部 2 2 aにキャップ 2 8を嵌合し、 図 9 Bにおいて第 2担体 2 2の一端部 2 2 aとキャップ 2 8の縁部とをスポッ ト 溶接にて固定し、 一端部 2 2 aを閉塞する。  First, a cap 28 is fitted to one end 22 a of the second carrier 22 in FIG. 9A, and one end 22 a of the second carrier 22 and the edge of the cap 28 are connected in FIG. 9B. Fix by spot welding and close one end 22a.
次に、 図 9 Cで仕切板 2 7の貫通孔部 2 7 bに第 2担体 2 2の他端部 2 2 bを 挿入し、 溶接にて固定する。 Next, in FIG.9C, the other end 22b of the second carrier 22 is inserted into the through hole 27b of the partition plate 27. Insert and fix by welding.
その後、 図 9 Dで第 2担体 2 2の一端部 2 2 aに、 クッション部材 2 4 (図 6 参照) を収納.した受け部 2 5を挿入し、 図 9 Eの姿に組立てる。  After that, in FIG. 9D, the receiving portion 25 containing the cushion member 24 (see FIG. 6) is inserted into one end 22a of the second carrier 22, and assembled as shown in FIG. 9E.
最後に、 図 9 Eに示した姿の第 2担体 2 2を図 6で示す通り半割状の排気管 5 の下半部内に位置決めし、 予め固定されだブラケッ ト 2 6に受け部 2 5を溶接し、 排気管 5の上半部を被せて上 ·下半部を溶接し、 排気管 5と仕切板 2 7のフラン ジ部 2 7 aとをプラグ溶接して組立作業を完了する。  Finally, the second carrier 22 shown in FIG. 9E is positioned in the lower half of the exhaust pipe 5 in a half shape as shown in FIG. 6, and the receiving part 25 is mounted on the bracket 26 fixed in advance. And the upper and lower halves of the exhaust pipe 5 are covered with each other, and the exhaust pipe 5 and the flange 27 a of the partition plate 27 are plug-welded to complete the assembly work.
次に、 第 1排気浄化装置 1 0及び第 2排気浄化装置 2 0の作用を図 2、 図 6に 基づき説明する。  Next, the operation of the first exhaust gas purification device 10 and the second exhaust gas purification device 20 will be described with reference to FIGS.
図 2に示されているように、 エンジンの排気は、 排気管 5の一端部 5 a側から 流入し、 第 1排気浄化装置 1 0を通過する際に、 内管 1 1に担持された貴金属と 接触して反応し、 浄化されて第 2排気浄化装置 2 0に到達する。  As shown in FIG. 2, the exhaust gas of the engine flows in from one end 5 a side of the exhaust pipe 5 and passes through the first exhaust gas purification device 10, and the noble metal carried on the inner pipe 11 And reacts therewith and is purified and reaches the second exhaust gas purification device 20.
図 6に示されているように、 第 2排気浄化装置 2 0において、 排気はこの図の 左側から流れてくる。 しかし、 第 2担体 2 2の一端部 2 2 aがキャップ 2 8で閉 塞されているため、 排気は一端部 2 2 aから流入しない。  As shown in FIG. 6, in the second exhaust gas purification device 20, exhaust gas flows from the left side of the figure. However, since the one end 22 a of the second carrier 22 is closed by the cap 28, the exhaust does not flow in from the one end 22 a.
排気管 5は、 第 2排気浄化装置 2 0を配置する部分が他の部分よりも大径であ り、 仕切板 2 7でその前後を仕切ることにより、 排気上流側を膨張室 2 9として いる。 このため、 膨張室 2 9でエンジン 3からの排気の脈動を規制して概ね滑ら かな定常流としている。 従って、 排気は、 図 6の矢印の方向に流れ、 排気管 5の 管壁近くを流れる排気が第 1担体 2 1 , 2 1に担持された貴金属と接触して反応 し浄化される。  The portion of the exhaust pipe 5 where the second exhaust gas purification device 20 is disposed has a larger diameter than the other portions, and the front and rear sides of the exhaust pipe 5 are partitioned by a partition plate 27 to form an expansion chamber 29 on the exhaust upstream side. . For this reason, the pulsation of the exhaust gas from the engine 3 is regulated in the expansion chamber 29 to provide a generally smooth steady flow. Therefore, the exhaust gas flows in the direction of the arrow in FIG. 6, and the exhaust gas flowing near the pipe wall of the exhaust pipe 5 comes into contact with the noble metal carried on the first carriers 21 and 21 to react and be purified.
更に、 排気は、 第 2担体 2 2の壁に開けられた多数の孔 2 2 cを通過して第 2 担体 2 2内に入り、 他端部 2 2 bを通過し排気管 5の排気下流側から大気に放出 される。 排気は、 第 2担体 2 2を通過する際に、 第 2担体 2 2に担持された貴金 属と接触して反応し浄化される。  Further, the exhaust gas passes through a number of holes 22 c formed in the wall of the second carrier 22, enters the second carrier 22, passes through the other end 22 b, and is exhausted downstream of the exhaust pipe 5. Released to the atmosphere from the side. When the exhaust gas passes through the second carrier 22, the exhaust gas contacts and reacts with the noble metal supported on the second carrier 22, and is purified.
この場合、 排気は、 第 2担体 2 2の壁に開けられた多数の孔 2 2 cを通過する ことにより、 第 2担体 2 2の表裏面に担持された触媒金属と接触するので、 排気 と触媒金属との接触面積が大きく、 触媒金属は浄化作用を十分に発揮する。  In this case, the exhaust gas passes through a large number of holes 22 c formed in the wall of the second support 22, and comes into contact with the catalyst metal supported on the front and back surfaces of the second support 22. The contact area with the catalyst metal is large, and the catalyst metal exerts a sufficient purifying action.
上述したように、 触媒の浄化作用を十分に発揮するためには、 触媒を高温にし て活性化させる必要がある。 一方、 排気管 5を流れる排気の温度は管の断面中央 部で高いものである。 第 2担体 2 2は、 排気管 5の断面中央部を流れる比較的高 温の排気をも麯媒金属と接触させて通過させるので、 触媒触媒が高温になり十分 に活性化し、 浄化作用を十分に発揮する。 第 2担体 2 2は、 多孔板製筒体からな るので、 排気が通過する際の圧力損失が小さく、 エンジンの性能に与える影響は 小さい: As described above, in order for the catalyst to fully exhibit its purifying action, the catalyst must be heated to a high temperature. Need to be activated. On the other hand, the temperature of the exhaust gas flowing through the exhaust pipe 5 is high at the center of the cross section of the pipe. Since the second carrier 22 allows relatively high-temperature exhaust gas flowing through the central part of the cross section of the exhaust pipe 5 to pass therethrough in contact with the catalyst metal, the catalyst becomes high in temperature and is sufficiently activated to sufficiently purify the purifying action. Demonstrate. Since the second carrier 22 is made of a perforated plate cylinder, the pressure loss when exhaust gas passes through is small, and the effect on the engine performance is small:
このように、 排気は、 第 1担体 2 1, 2 1及び第 2担体 2 2に担持された貴金 属と接触して反応し、 浄化されるので、 効率良ぐ浄化される。 更に、 排気は概ね 滑らかな定常流とされるので、 第 2排気浄化装置 2 0の浄化能力が変動せず、 効 率良く浄化される。  As described above, the exhaust gas comes into contact with and reacts with the noble metal supported on the first carriers 21 and 21 and the second carrier 22 and is purified, so that the exhaust gas is efficiently purified. Further, since the exhaust gas has a substantially steady flow, the purification performance of the second exhaust gas purification device 20 does not fluctuate and the exhaust gas is efficiently purified.
第 2担体 2 2は、 反応熱等により排気管 5よりも高温になる。 第 2担体 2 2は、 該 2担体 2 2の他端部 2 2 bが仕切板 2 7により排気管 5に固定されているた め、 熱膨張に伴い排気管 5と第 2担体 2 2との間に伸び量の差が発生すると、 一 端部 2 2 aが白抜き矢印の方向に伸び、 伸び量の差を吸収する。 排気管 5と第 2 担体 2 2との間の径方向の伸び量の差は、 クッション部材 2 4が弾性変形するこ とにより吸収される。  The temperature of the second carrier 22 becomes higher than that of the exhaust pipe 5 due to reaction heat or the like. Since the second carrier 22 has the other end 2 2 b of the second carrier 22 fixed to the exhaust pipe 5 by the partition plate 27, the exhaust pipe 5 and the second carrier 22 are connected with the thermal expansion. When a difference in the amount of elongation occurs between the two, the end 22a extends in the direction of the outline arrow to absorb the difference in the amount of elongation. The difference in the radial elongation between the exhaust pipe 5 and the second carrier 22 is absorbed by the elastic deformation of the cushion member 24.
前記第 2担体 2 2は、 排気上流側を閉塞されたものであり、 例えば、 図 1 0 A 〜図 1 O Dに示されている構成であってもよい:  The second carrier 22 has a closed exhaust upstream side, and may have, for example, the configuration shown in FIGS. 10A to 1OD:
図 1 0 A〜図 1 O Dには、 上記第 1実施例に係る第 2担体 2 2の変形例が示さ れている。  FIGS. 10A to 10D show modified examples of the second carrier 22 according to the first embodiment.
図 1 0 Aは、 第 2担体 2 2の一端部 2 2 aを、 排気上流側に膨出する多孔板製 キャップ 3 1で閉塞した構成であり、 多孔板製キャップ 3 1はプレス成型にて形 成されたものである。  FIG. 10A shows a configuration in which one end 22 a of the second carrier 22 is closed by a perforated plate cap 31 bulging to the exhaust upstream side, and the perforated plate cap 31 is press-molded. It was formed.
図 1 0 Bは、 第 2担体 2 2の一端部 2 2 aを偏平に潰して、 キャップ 3 2とし た構成である。  FIG. 10B shows a configuration in which one end 22 a of the second carrier 22 is flattened to form a cap 32.
図 1 0 Cは、 排気の通過抵抗を増さしめるため、 第 2担体 2 2の一端部 2 2 a に、 複数枚の多孔板製ブレードをスパイラル状 (風車状) に取付け、 該複数枚の 多孔板製ブレードをキャップ 3 3とした構成である - 図 1 0 Dは、 第 2担体 2 2の一端部 2 2 aを、 平板状の多孔板製キャップ 3 4 で閉塞した構成である。 平板状の多孔板製キャップ 3 4を取付ける代りに、 一端 部 2 2 a自体を第 2担体 2 2の中心側に縁折りして平板状のキャップを構成し、 排気上流側を 塞するようにしてもよい- 図 1 O A〜図 1 0 Dに示される各キャップ 3 1, 3 2, 3 3, 3 4は、 前述し た第 1実施例の構成と同様の作用を有し、 *しかも、 多孔板からなるので、 各キヤ ップ 3 1, 3 2, 3 3, 3 4を備えたことによる圧力損失が、 第 1実施例の構成 よりも小さくてすむ。 FIG. 10C shows that a plurality of perforated plate blades are attached to one end 22 a of the second carrier 22 in a spiral shape (windmill shape) in order to increase the exhaust gas passage resistance. The perforated plate blade is configured as a cap 33-FIG. 10D shows one end 22 a of the second carrier 22 as a flat plate-shaped perforated plate cap 3 4 It is a configuration closed by. Instead of attaching a plate-shaped cap 34 made of a perforated plate, one end 22 a itself is bent toward the center of the second carrier 22 to form a plate-shaped cap so as to close the exhaust upstream side. Each of the caps 31, 32, 33, and 34 shown in FIGS. 1OA to 10D has the same operation as that of the first embodiment described above. Since it is made of a perforated plate, the pressure loss due to the provision of the caps 31, 32, 33, 34 can be smaller than that of the first embodiment.
第 2担体 2 2の支持構造は、 第 2担体 2 2の一方が排気管 5に対して軸方向に 伸縮可能に支持され、 他方が排気管 5に固定されるものであり、 例えば、 図 1 1 A〜図 1 1 Hに示す構成としてもよい  The support structure of the second carrier 22 is such that one of the second carriers 22 is supported so as to be able to expand and contract in the axial direction with respect to the exhaust pipe 5 and the other is fixed to the exhaust pipe 5. 1 A to Fig. 11 H
図 1 1八〜図1 1 Hは、 第 1実施例に係る第 2担体 2 2の支持構造の変形例を 示している。 排気はこれら図の矢印の方向に流れ、 第 2担体 2 2の一端部 2 2 a は熱膨張により白抜き矢印の方向に伸びる。  11 to 11H show modified examples of the support structure of the second carrier 22 according to the first embodiment. The exhaust gas flows in the directions of the arrows in these figures, and the one end 22 a of the second carrier 22 extends in the direction of the white arrow due to thermal expansion.
図 1 1 Aに示されている第 2担体 2 2の支持構造は、 該第 2担体 2 2の一端部 2 2 aを支持部材 2 3よりも排気上流側に延ばし、 一端部 2 2 aを平板状のキヤ ップ 2 8で閉塞した構成をしている。  In the support structure of the second carrier 22 shown in FIG. 11A, one end 22 a of the second carrier 22 extends to the exhaust upstream side of the support member 23, and the one end 22 a It is configured to be closed by a flat cap 28.
図 1 1 Bに示されている第 2担体 2 2の支持構造は、 支持部材 2 3の排気上流 側 (この図の左側) をキャップ 3 6により閉塞した構成をしている。 一端部 2 2 aとキャップ 3 6との間には、 第 2担体 2 2の熱膨張による伸び量よりも大きい 隙間 を有する。 この場合には、 第 2担体 2 2の一端部 2 2 aにキャップを取 付ける必要がない:  The support structure of the second carrier 22 shown in FIG. 11B has a configuration in which the exhaust upstream side (the left side in this figure) of the support member 23 is closed by the cap 36. There is a gap between the one end 22 a and the cap 36 that is larger than the amount of expansion of the second carrier 22 due to thermal expansion. In this case, it is not necessary to attach a cap to one end 22a of the second carrier 22:
図 1 1 Cに示されている第 2担体 2 2の支持構造は、 支持部材 2 3の受け部 2 5がブラケッ ト 2 6よりも、 排気管 5の軸方向に長い構成となっている- 図 1 1 Dに示されている第 2担体 2 2の支持構造は、 第 2担体 2 2が仕切板 2 7だけで支持された一端支持の構成となっている。 支持部材 3 7は、 第 2担体 2 2の他端部 2 2 bを排気管 5の軸方向に伸縮可能に支持するクッション部材 3 8 と、 該クッション部材 3 8を 納する受け部 3 9と、 該受け部 3 9を排気管 5に 固定する仕切板 2 7とからなっている。 他端部 2 2 bと受け部 3 9のフランジ 3 9 aとの間には隙間 S 2 を有し、 該隙間 S 2 は、 隙間 S 2 の範囲内において他端 部 2 2 bの移動量及び伸び量を規制するものである。 The support structure of the second carrier 22 shown in FIG. 11C has a configuration in which the receiving portion 25 of the support member 23 is longer in the axial direction of the exhaust pipe 5 than the bracket 26- The support structure of the second carrier 22 shown in FIG. 11D has a configuration of one end support in which the second carrier 22 is supported only by the partition plate 27. The support member 37 includes a cushion member 38 that supports the other end 22 b of the second carrier 22 so as to be able to expand and contract in the axial direction of the exhaust pipe 5, and a receiving part 39 that accommodates the cushion member 38. And a partition plate 27 for fixing the receiving portion 39 to the exhaust pipe 5. A gap S 2 is provided between the flange 3 9 a of the other end 2 2 b and the receiving portion 3 9, the clearance S 2 is the other end in the range of the clearance S 2 It regulates the amount of movement and elongation of part 22b.
図 1 1 Eは、 図 1 1 Dの構成の変形例であり、 クッション部材 3 8及び受け部 3 9の長さが図 1 1 Dの構成よりも短い- 図 1 1 Fに示されている第 2担体 2 2の支持構造は、 第 2担体 2 2の一端部 2 2 aをブラケッ ト 4 1で排気管 5に固定じ、 第 2担体 2 2の他端部 2 2 bを排気 管 5の軸方向に伸縮可能に支持部材 4 2にて支持した両端支持の構成となってい る。 支持部材 4 2は、 第 2担体 2 2の他端部 2 2 bを排気管 5の軸方向に伸縮可 能に支持するクッション部材 4 3と、 該クッション部材 4 3を 納する受け部 4 4と、 該受け部 4 4を排気管 5に固定する仕切板 2 7とからなっている。 他端部 2 2 bは、 支持部材 4 2よりも排気下流側 (この図の左側) に延びている。 図 1 1 Gに示されている第 2担体 2 2の支持構造は、 図 1 1 Fの構成の変形例 であり、 第 2担体 2 2の一端部 2 2 aに切り起こし爪付きキャップ 4 5を取付け ることにより、 一端部 2 2 aを閉塞した構成をしている。  FIG. 11E is a modification of the configuration of FIG. 11D, in which the lengths of the cushion member 38 and the receiving portion 39 are shorter than the configuration of FIG. 11D—shown in FIG. 11F. The support structure of the second carrier 22 is such that one end 22 a of the second carrier 22 is fixed to the exhaust pipe 5 with a bracket 41, and the other end 22 b of the second carrier 22 is connected to the exhaust pipe 5. Both ends are supported by a support member 42 so as to be able to expand and contract in the axial direction. The support member 42 includes a cushion member 43 that supports the other end 22 b of the second carrier 22 so as to be able to expand and contract in the axial direction of the exhaust pipe 5, and a receiving part 44 that stores the cushion member 43. And a partition plate 27 for fixing the receiving portion 44 to the exhaust pipe 5. The other end 22 b extends downstream of the support member 42 on the exhaust side (left side in this figure). The support structure of the second carrier 22 shown in FIG. 11G is a modified example of the configuration of FIG. 11F, and the cap with cut-and-raised claw 4 5 is provided at one end 22 a of the second carrier 22. By attaching a, the end 22a is closed.
図 1 1 Hは、 上記クッシヨン部材 2 4, 3 8, 4 3の変形例であり、 ステンレ ス線材を編み込んでリング状にしたクッシヨン部材 4 8の構成である。 例えば、 支持部材 4 6は、 第 2担体 2 2の他端部 2 2 bに巻いた座板 4 7と、 該座板 4 7 を挿入し他端部 2 2 bを排気管 5の軸方向に伸縮可能に支持する前後 2つのクッ シヨン部材 4 8 , 4 8と、 該クッション部材 4 8, 4 8を収納する円筒状の受け 部 4 9と、 該受け部 4 9を排気管 5に固定する仕切板 2 7とからなっている,: 次に、 図 1 2及び図 1 3に基づき第 2排気浄化装置の第 2実施例を説明する, 図 1 2において、 第 2排気浄化装置 5 0は、 排気管 5の内壁面近傍に沿わせた 第 1担体 5 1を配置し、 該第 1担体 5 1の断面略々中央部 (排気管 5の断面略々 中央部) に第 2担体 5 2を配置している。 第 1担体 5 1及び第 2担体 5 2は、 排 気管 5の軸方向に延びている。  FIG. 11H is a modified example of the above cushion members 24, 38, and 43, and has a configuration of a cushion member 48 in which a stainless wire is woven into a ring shape. For example, the support member 46 includes a seat plate 47 wound around the other end 22 b of the second carrier 22, and the seat plate 47 is inserted into the support member 46, and the other end 22 b is inserted in the axial direction of the exhaust pipe 5. Two cushion members 48, 48, which can be extended and retracted, and a cylindrical receiving part 49 for accommodating the cushion members 48, 48, and the receiving part 49 fixed to the exhaust pipe 5. Next, a second embodiment of the second exhaust gas purification device will be described with reference to FIGS. 12 and 13. In FIG. 12, the second exhaust gas purification device 50 A first carrier 51 is arranged along the inner wall surface of the exhaust pipe 5, and a second carrier 5 is provided at substantially the center of the cross section of the first carrier 51 (substantially at the center of the cross section of the exhaust pipe 5). 2 are arranged. The first carrier 51 and the second carrier 52 extend in the axial direction of the exhaust pipe 5.
前記第 1担体 5 1は、 円筒体からなり、 軸方向両端部にコーン部 5 1 a , 5 1 aを備え、 これらのコーン部 5 1 a, 5 1 aの一方又は両方を排気管 5に溶接に て固定したものである。 第 2担体 5 2は平板からなり、 その長手方向一端又は両 端を第 1担体 5 1内に溶接にて固定したものである。  The first carrier 51 is formed of a cylindrical body and includes cone portions 51 a and 51 a at both ends in the axial direction. One or both of the cone portions 51 a and 51 a is connected to the exhaust pipe 5. It is fixed by welding. The second carrier 52 is formed of a flat plate, and one or both ends in the longitudinal direction are fixed to the first carrier 51 by welding.
第 1担体 5 1及び第 2担体 5 2は、 薄肉鋼板製多孔板で構成されている: 第 1 担体 5 1及び第 2担体 5 2は、 それぞれ多数の孔 5 1 c, 5 2 aを有した壁面に、 白金やロジウム等の触媒機能を有する貴金属を担持されている (貴金属を含んだ 溶液を塗布等.で付着) : The first carrier 51 and the second carrier 52 are formed of a thin steel plate perforated plate. The carrier 51 and the second carrier 52 carry a noble metal having a catalytic function such as platinum or rhodium on a wall surface having a large number of holes 51 c and 52 a, respectively. (Attach by coating etc.)
図 1 3には、 平板からなる第 2担体 5 2が第 1担体 5 1内で起立した状態で示 されている。 . '  FIG. 13 shows a state where the second carrier 52 made of a flat plate stands in the first carrier 51. '
次に、 上記第 2実施例に係る第 2排気浄化装置 5 0の作用を図 1 2に基づき説 明する。  Next, the operation of the second exhaust gas purification device 50 according to the second embodiment will be described with reference to FIG.
エンジンの排気は、 この図の矢印の方向に流れ、 管壁近くを流れる排気が第 1 担体 5 1の壁に開けられた多数の孔 5 1 cを通過しながら流れ、 断面略々中央部 を流れる排気が第 2担体 5 2の壁に開けられた多数の孔 5 2 aを通過しながら流 れる。 このため、 排気は、 第 1担体 5 1及び第 2担体 5 2に担持された貴金属と 接 して反応し浄化される。  The exhaust of the engine flows in the direction of the arrow in this figure, and the exhaust flowing near the pipe wall flows while passing through a number of holes 51 c formed in the wall of the first carrier 51, and passes through a substantially central portion in cross section. The flowing exhaust gas flows while passing through a large number of holes 52 a formed in the wall of the second carrier 52. Therefore, the exhaust gas comes into contact with the noble metal supported on the first carrier 51 and the second carrier 52 to react and be purified.
この場合、 排気は、 第 2担体 5 2の壁に開けられた多数の孔 5 2 aを通過する ことにより、 第 2担体 5 2の表裏面に担持された触媒金属と接触するので、 排気 と触媒金属との接触面積が大きく、 触媒金属は浄化作用を十分に発揮する。  In this case, the exhaust gas passes through a large number of holes 52 a formed in the wall of the second carrier 52, and comes into contact with the catalyst metal supported on the front and back surfaces of the second carrier 52. The contact area with the catalyst metal is large, and the catalyst metal exerts a sufficient purifying action.
第 2担体 5 2に担持された貴金属は、 排気管 5の断面中央部を流れる比較的高 温の排気と接触するので、 高温になり十分に活性化し、 浄化作用を十分に発揮す る。  The noble metal carried on the second carrier 52 comes into contact with the relatively high-temperature exhaust gas flowing through the central portion of the cross section of the exhaust pipe 5, so that it becomes high in temperature and is sufficiently activated to sufficiently exert a purifying action.
第 2担体 5 2は、 排気管 5の軸方向に延びた平板から成るので、 排気が通過す る際の圧力損失が、 前述した第 1実施例の構成よりも一層小さくなる- 上記第 2実施例の構成の第 2排気浄化装置 5 0は、 例えば図 1 4及び図 1 5に 示す構成であってもよい。  Since the second carrier 52 is formed of a flat plate extending in the axial direction of the exhaust pipe 5, the pressure loss when exhaust gas passes is further reduced as compared with the configuration of the above-described first embodiment. The second exhaust gas purification device 50 having the example configuration may have the configuration shown in FIGS. 14 and 15, for example.
すなわち、 図 1 4は、 第 2実施例に係る第 2排気浄化装置 5 0の変形例を示し ている。 第 1担体 5 1は、 円筒体の径方向の一部 (例えば、 図 1 4の下部) を切 欠いた欠円断面形状である。  That is, FIG. 14 shows a modification of the second exhaust gas purification device 50 according to the second embodiment. The first carrier 51 has a partially circular cross-sectional shape in which a part of the cylindrical body in the radial direction (for example, the lower part in FIG. 14) is cut out.
図 1 5において、 第 1担体 5 1は、 欠円断面の両縁から折返されたフランジ部 5 1 b , 5 1 bを排気管 5の内壁に接している。 第 2担体 5 2は、 第 1担体 5 1 の欠円部分を貫通して排気管 5の内壁に接している。  In FIG. 15, the first carrier 51 contacts the inner wall of the exhaust pipe 5 with the flange portions 51 b and 51 b folded from both edges of the cross section of the broken circle. The second carrier 52 penetrates through the missing circle of the first carrier 51 and is in contact with the inner wall of the exhaust pipe 5.
図 1 6 A〜図 1 6 Eは、 本発明の第 3実施例に係る排気浄化装置の概要を示し ている。 FIGS. 16A to 16E show an outline of an exhaust gas purification apparatus according to a third embodiment of the present invention. ing.
図 1 6 Aにおける排気浄化装置 6 1は、 排気管 5内に前後 2段の浄化装置を配 置し、 前段の浄化装置と後段の浄化装置との間に排気量を調節するための調節弁 (例えば、 バタフライ弁) 6 2を介在させた構成をしている。 前段の浄化装置は、 前述した図 3に示されている第 1排気浄^:装置 1 0の構成であり、 後段の浄化装 置は、 前述した図 1 2に示されている第 2排気浄化装置 5 0の構成である。  The exhaust gas purification device 61 in Fig. 16A is a control valve that has two stages of purification devices, one in front and the other in the exhaust pipe 5, and adjusts the amount of exhaust gas between the upstream purification device and the downstream purification device. (For example, butterfly valve) It has a configuration with 62 interposed. The former purification device has the structure of the first exhaust gas purification device 10 shown in FIG. 3 described above, and the latter purification device has the second exhaust gas purification device shown in FIG. 12 described above. This is the configuration of the device 50.
図 1 6 Bにおける排気浄化装置 6 3は、 排気管 5内に前後 3段の浄化装置を配 置した構成をしている。 前段の浄化装置は、 前述した図 3に示されている第 1排 気浄化装置 1 0の構成であり、 中段の浄化装置は、 前述した図 1 2に示されてい る第 2排気浄化装置 5 0の構成であり、 後段の浄化装置は、 排気管 5の他端部 5 bから排気管 5内に延びた導出管 6 4の構成である。 該導出管 6 4は、 薄肉鋼板 製 孔板で構成され、 多孔を有した壁面に、 白金やロジウム等の触媒機能を有す る貴金属を担持される (貴金属を含んだ溶液を塗布等で付着) :  The exhaust gas purifier 63 shown in FIG. 16B has a configuration in which three stages of purifiers are arranged in the exhaust pipe 5 before and after. The purification device in the first stage has the configuration of the first exhaust gas purification device 10 shown in FIG. 3 described above, and the purification device in the middle stage is the second exhaust gas purification device 5 shown in FIG. The purifying device at the subsequent stage has a configuration of an outlet pipe 64 extending into the exhaust pipe 5 from the other end 5 b of the exhaust pipe 5. The outlet pipe 64 is composed of a perforated plate made of a thin steel plate, and carries a noble metal having a catalytic function such as platinum or rhodium on a porous wall (adhesion of a solution containing a noble metal by application or the like). ):
図 1 6 Cにおける排気浄化装置 6 5は、 排気管 5の断面略中央部に、 排気管 5 の軸方向に延びる担体 6 6を配置した構成をしている。 該担体 6 6は、 薄肉鋼板 製多孔板で構成された平板であり,、 多数の孔を有した壁面に、 白金やロジウム等 の触媒機能を有する貴金属を担持された (貴金属を含んだ溶液を塗布等で付着) ものである- 図 1 6 Dにおける排気浄化装置 6 7は、 上記図 1 6 Cに示した排気浄化装置の 変形例であり、 担体 6 6を平板の代りに波形板 (コルゲート板) としたものであ る。  The exhaust gas purifying device 65 in FIG. 16C has a configuration in which a carrier 66 extending in the axial direction of the exhaust pipe 5 is arranged at a substantially central portion of the cross section of the exhaust pipe 5. The carrier 66 is a flat plate made of a thin steel plate perforated plate, and has a noble metal having a catalytic function such as platinum or rhodium supported on a wall surface having a large number of holes (a solution containing a noble metal is used). The exhaust gas purifying device 67 shown in Fig. 16D is a modification of the exhaust gas purifying device shown in Fig. 16C above. The carrier 66 is replaced with a corrugated plate instead of a flat plate. Board).
図 1 6 Eにおける排気浄化装置 6 8は、 排気管 5の軸方向に延び軸方向両端が 閉塞された半円筒状の担体 6 9を配置した構成をしている。 該担体 6 9は、 径方 向開放端 6 9 aを排気管 5の断面略中央部に配置している。 担体 6 9は、 薄肉鋼 板製多孔板で構成され、 多数の孔を有した壁面に、 白金やロジウム等の触媒機能 を有する貴金属を担持される (貴金属を含んだ溶液を塗布等で付着)  The exhaust gas purification device 68 in FIG. 16E has a configuration in which a semi-cylindrical carrier 69 extending in the axial direction of the exhaust pipe 5 and having both axial ends closed is disposed. The carrier 69 has a radially open end 69 a disposed substantially at the center of the cross section of the exhaust pipe 5. The carrier 69 is made of a thin steel plate perforated plate, and carries a noble metal having a catalytic function such as platinum or rhodium on a wall surface having a large number of holes (a solution containing a noble metal is applied by coating or the like).
図 1 6 C、 図 1 6 Dおよび図 1 6 Eに示されている担体 6 6, 6 9は、 図 1 6 Aおよび図 1 6 Bに示されている排気管 5内に配置した多段の浄化装置に適用す るようにしてもよい: 上記第 1 ·第 2 ·第 3実施例及び変形例において、 触媒金属を担持した "薄肉 鋼板" は、 排気管 5の断面略中央部又は第 1担体 2 1, 5 1の断面略中央部に配 置されるものであり、 具体的な例示として、 図 1〜図 9に示す第 1実施例及び図 1 0, 図 1 1に示す変形例では、 多孔板製筒体からなる第 2担体 2 2を構成し、 図 1 2, 図 1 3に示す第 2実施例、 図 1 4, 図 1 5に示す変形例、 及び図 1 6 A, 図 1 6 Bに示す第 3実施例では、 多孔板製平板からなる第 2担体 5 2を構成し、 図 1 6 C、 図 1 6 Dおよび図 1 6 Eに示す第 3実施例では、 多孔板製平板、 波形 板、 又は半筒状からなる担体 6 6, 6 9を構成している。 このように、 本発明においては、 "薄肉鋼板" は、 上記の各実施例やその変形 例の構成に限定されるものではなく、 かつ多孔板製に限定されるものでもない: 多孔板の孔形状ゃ孔の大きさ、 数量は任意である。 産業上の利用可能性 The supports 66 and 69 shown in FIGS. 16C, 16D and 16E are arranged in a multi-staged exhaust pipe 5 shown in FIGS. 16A and 16B. May be applied to purification equipment: In the first, second, and third embodiments and the modified examples, the “thin steel plate” supporting the catalyst metal is provided at substantially the center of the cross section of the exhaust pipe 5 or substantially at the center of the cross section of the first carriers 21, 51. As a specific example, in the first embodiment shown in FIGS. 1 to 9 and the modified examples shown in FIGS. 10 and 11, the second carrier 2 made of a perforated plate cylindrical body is used. The second embodiment shown in FIGS. 12 and 13 and the modified examples shown in FIGS. 14 and 15 and the third embodiment shown in FIGS. A second carrier 52 composed of a flat plate made of a plate is constituted, and in the third embodiment shown in FIGS. 16C, 16D and 16E, the second carrier 52 is formed of a perforated flat plate, a corrugated plate, or a half-cylinder Carriers 66 and 69 are constituted. As described above, in the present invention, the “thin-walled steel sheet” is not limited to the configuration of each of the above-described embodiments and the modifications thereof, and is not limited to a perforated plate. The shape and size of the holes are arbitrary. Industrial applicability
以上のように本発明に係る内燃機関の排気浄化装置は、 内燃機関の排気口から 延びた排気管の断面略中央部に、 触媒金属を担持した薄肉鋼板を配置したことに より、 排気温度が高い断面略々中央部に触媒金属が配置されるので、 触媒金属を 活性化させて排気の浄化作用を十分に発揮させることができ、 しかも、 低コスト で実現することができる。  As described above, the exhaust gas purifying apparatus for an internal combustion engine according to the present invention has a low exhaust gas temperature by arranging a thin steel plate carrying a catalytic metal at a substantially central portion of a cross section of an exhaust pipe extending from an exhaust port of the internal combustion engine. Since the catalyst metal is arranged approximately at the center of the high cross section, the catalyst metal can be activated to sufficiently exhibit the exhaust gas purifying action, and can be realized at low cost.
また、 本発明の内燃機関の排気浄化装置は、 薄肉鋼板を、 排気管の軸方向に延 びる筒体にしたので、 排気が通過する際の圧力損失が小さくなり、 このため、 内 燃機関の性能に影響を与えることがないという利点を有する =  In the exhaust gas purifying apparatus for an internal combustion engine according to the present invention, the thin steel plate is formed into a cylindrical body extending in the axial direction of the exhaust pipe, so that pressure loss when exhaust gas passes through is reduced. Has the advantage of not affecting performance =
更に、 本発明の内燃機関の排気浄化装置は、 筒体を多孔板で構成し、 筒体の排 気上流側を閉塞したことにより、 筒体の壁に開けられた多数の孔を排気が通過す るので、 排気は第 2担体の表裏面に担持された触媒金属と接触する。 従って、 排 気と触媒金属との接触面積が大きくなり、 排気の浄化作用が更に高まることとな る。  Further, in the exhaust gas purifying apparatus for an internal combustion engine according to the present invention, since the cylindrical body is formed of a perforated plate, and the exhaust upstream side of the cylindrical body is closed, exhaust gas passes through a number of holes formed in the wall of the cylindrical body. Therefore, the exhaust gas comes into contact with the catalyst metal supported on the front and back surfaces of the second carrier. Therefore, the contact area between the exhaust gas and the catalytic metal is increased, and the exhaust gas purifying action is further enhanced.
更にまた、 本発明の内燃機関の排気浄化装置は、 内燃機関の排気口から延びた 排気管の断面略中央部に、 排気管の軸方向に延び触媒金属を担持した薄肉鋼板製 筒体を配置し、 排気管内に、 薄肉鋼板製筒体を支持するとともに、 この薄肉鋼板 製筒体と排気管との間の通路を塞ぐ仕切板を備えたことにより、 排気温度が高い 断面略々中央部に触媒金属が配置されるので、 触媒金属を活性化させて浄化作用 を十分に発揮させることができ、 且つ低コスト化が実現できる: また、 仕切板で その前後を仕切って内燃機関からの排気 脈動を規制して概ね滑らかな定常流と するので、 排気浄化装置の浄化能力が変動せず、 浄化作用を十分に発揮すること ができる。 更に、 排気の脈動を規制する仕切板で薄肉鋼板製筒体を支持するので、 別異の支持部材が不要であり、 支持構成が簡易なものとなる。 Still further, the exhaust gas purifying apparatus for an internal combustion engine according to the present invention comprises a thin steel plate supporting a catalytic metal extending in the axial direction of the exhaust pipe substantially at the center of the cross section of the exhaust pipe extending from the exhaust port of the internal combustion engine. A high exhaust temperature is achieved by disposing a cylindrical body, supporting a thin-walled steel plate in the exhaust pipe, and providing a partition plate that closes the passage between the thin-walled steel cylinder and the exhaust pipe. Since the catalytic metal is arranged at the center of each part, the catalytic metal can be activated to exert its purifying action sufficiently and to reduce costs. Since the pulsation of exhaust gas from the exhaust gas is regulated to make a substantially smooth steady flow, the purification ability of the exhaust gas purification device does not fluctuate, and the purification action can be sufficiently exerted. Furthermore, since the thin steel plate cylinder is supported by the partition plate that regulates the pulsation of exhaust gas, a separate support member is not required, and the support configuration is simplified.
更に、 本発明の内燃機関の排気浄化装置は、 薄肉鋼板製筒体を排気管に対して 軸方向に伸縮可能に取付けたことにより、 熱膨張に伴う筒体と排気管との間の伸 び量の差を吸収することが容易となる。  Further, in the exhaust gas purifying apparatus for an internal combustion engine of the present invention, since the thin-walled steel plate cylinder is attached to the exhaust pipe so as to be able to expand and contract in the axial direction, the extension between the cylinder and the exhaust pipe due to thermal expansion is provided. It is easy to absorb the difference in the amount.
更にまた、 本発明の内燃機関の排気浄化装置は、 内燃機関の排気口から延びた 排気管の内壁面近傍に沿わせて触媒金属を担持した第 1担体を配置し、 該第 1担 体の断面略中央部に触媒金属を担持した第 2担体を配置したことにより、 排気管 の内壁面近傍並びに断面略中央部の両方に触媒金属を担持した担体が配置される ので、 内燃機関の性能に極力影響を与えずに排気浄化作用をより一層高めること ができ、 しかも、 低コストにすることができるという利点を有する。  Still further, the exhaust gas purifying apparatus for an internal combustion engine according to the present invention includes a first carrier carrying a catalyst metal disposed along the vicinity of an inner wall surface of an exhaust pipe extending from an exhaust port of the internal combustion engine. By arranging the second carrier carrying the catalyst metal at approximately the center of the cross section, the carrier carrying the catalyst metal is disposed both near the inner wall surface of the exhaust pipe and substantially at the center of the cross section, thus improving the performance of the internal combustion engine. There is an advantage that the exhaust gas purifying action can be further enhanced without affecting as much as possible, and the cost can be reduced.

Claims

請 求 の 範 囲 The scope of the claims
1. 内燃機関.(3) と、 該内燃機関 (3) の排気口 (4) から延びて前記内燃機 関 (3) からの排気ガスを浄化するための排気管 (5) と、 を備えてなる排気浄 化装置において、 4 1. An internal combustion engine (3), comprising: an exhaust pipe (5) extending from an exhaust port (4) of the internal combustion engine (3) for purifying exhaust gas from the internal combustion engine (3). 4
前記排気管 (5) の断面略々中央部に、 触媒金属を担持した薄肉鋼板 (22) を配置したことを特徴とする内燃機関の排気浄化装置。  An exhaust gas purifying apparatus for an internal combustion engine, wherein a thin steel plate (22) supporting a catalyst metal is disposed at a substantially central portion of a cross section of the exhaust pipe (5).
2. 前記薄肉鋼板 (22) は、 前記排気管 (5) の軸方向に延びる筒体であるこ とを特徴とする請求の範囲 1に記載の内燃機関の排気浄化装置。 2. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein the thin steel plate (22) is a cylinder extending in an axial direction of the exhaust pipe (5).
3. 前記筒体は、 多孔板からなり、 排気上流側が閉塞されていることを特徴とす る請求の範囲 2に記載の内燃機関の排気浄化装置。 3. The exhaust gas purifying apparatus for an internal combustion engine according to claim 2, wherein the cylindrical body is made of a perforated plate, and an exhaust gas upstream side is closed.
4. 内燃機関 (3) と、 該内燃機関 (3) の排気口 (4) から延びて前記内燃機 関 (3) からの排気ガスを浄化するための排気管 (5) と、 を備えてなる排気浄 化装置において、 4. An internal combustion engine (3), and an exhaust pipe (5) extending from an exhaust port (4) of the internal combustion engine (3) for purifying exhaust gas from the internal combustion engine (3). In the exhaust purification system,
前記排気管 (5) の断面略々中央部に、 前記排気管 (5) の軸方向に延び触媒 金属を担持した薄肉鋼板製筒体 (22) を配置し、 前記排気管 (5) 内に前記薄 肉鋼板製筒体 (22) を支持するとともに、 前記薄肉鋼板製筒体 (22) と排気 管 (5) との間の通路を塞ぐ仕切板 (27) を備えたことを特徴とする内燃機関 の排気浄化装置。  A thin steel plate cylinder (22) extending in the axial direction of the exhaust pipe (5) and carrying a catalyst metal is disposed substantially at the center of the cross section of the exhaust pipe (5). A partition plate (27) for supporting the thin steel plate cylinder (22) and closing a passage between the thin steel plate cylinder (22) and the exhaust pipe (5) is provided. Exhaust purification device for internal combustion engine.
5. 前記薄肉鋼板製筒体 (22) は、 前記排気管 (5) に対して軸方向に伸縮可 能に取付けられていることを特徴とする請求の範囲 4に記載の内燃機関の排気浄 化装置。 5. The exhaust purification system for an internal combustion engine according to claim 4, wherein the thin steel plate cylinder (22) is attached to the exhaust pipe (5) so as to be able to expand and contract in the axial direction. Device.
6. 内燃機関 (3) と、 該内燃機関 (3) の排気口 (4) から延びて前記内燃機 関 (3) からの排気ガスを浄化するための排気管 (5) と、 を備えてなる排気浄 化装置において、 6. An internal combustion engine (3), and an exhaust pipe (5) extending from an exhaust port (4) of the internal combustion engine (3) for purifying exhaust gas from the internal combustion engine (3). Exhaust gas purification In the gasifier,
前記排気管 (5) の内壁面近傍に沿わせて触媒金属を担持した第 1担体 (21 , 51) を配置.し、 該第 1担体 (21, 51) の断面略々中央部に触媒金属を担持 した第 2担体 (22, 52) を配置したことを特徴とする内燃機関の排気浄化装  A first carrier (21, 51) supporting a catalyst metal is arranged along the inner wall surface of the exhaust pipe (5), and the catalyst metal is provided substantially at the center of the cross section of the first carrier (21, 51). An exhaust purification device for an internal combustion engine, characterized in that a second carrier (22, 52) carrying the carbon is arranged.
7. 前記第 1担体 (51) は円筒体からなり、 前記第 2担体 (52) は平板から なることを特徴とする請求の範囲 6に記載の内燃機関の排気浄化装置: 7. The exhaust gas purifying apparatus for an internal combustion engine according to claim 6, wherein the first carrier (51) is made of a cylindrical body, and the second carrier (52) is made of a flat plate.
8. 前記第 1担体 (21, 51) および前記第 2担体 (22, 52) は、 多数の 孔 (21 a, 51 c , 22 c , 52 a) を有することを特徴とする請求の範囲 6 に記載の内燃機関の排気浄化装置。 8. The first carrier (21, 51) and the second carrier (22, 52) have a large number of holes (21a, 51c, 22c, 52a). An exhaust gas purifying apparatus for an internal combustion engine according to claim 1.
PCT/JP1996/001382 1995-05-25 1996-05-24 Exhaust emission control device for internal combustion engines WO1996037691A1 (en)

Priority Applications (2)

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EP96914422A EP0831211B1 (en) 1995-05-25 1996-05-24 Exhaust purifying apparatus for internal combustion engine
KR1019970706385A KR100401948B1 (en) 1995-05-25 1996-05-24 Exhaust purifying device of internal combustion engine

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JP12689695A JP3614206B2 (en) 1995-05-25 1995-05-25 Exhaust gas purification device for internal combustion engine
JP7/126896 1995-05-25

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EP0831211B1 (en) 2010-09-29
KR100401948B1 (en) 2004-03-24
JP3614206B2 (en) 2005-01-26
CN1080370C (en) 2002-03-06
JPH08319824A (en) 1996-12-03
CN1184523A (en) 1998-06-10
EP0831211A4 (en) 2006-06-14

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