EP1467070B1 - Combined exhaust gas treatment/silencer device in an exhaust line of an internal combustion engine - Google Patents

Combined exhaust gas treatment/silencer device in an exhaust line of an internal combustion engine Download PDF

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Publication number
EP1467070B1
EP1467070B1 EP04007937A EP04007937A EP1467070B1 EP 1467070 B1 EP1467070 B1 EP 1467070B1 EP 04007937 A EP04007937 A EP 04007937A EP 04007937 A EP04007937 A EP 04007937A EP 1467070 B1 EP1467070 B1 EP 1467070B1
Authority
EP
European Patent Office
Prior art keywords
exhaust
section
housing
module
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04007937A
Other languages
German (de)
French (fr)
Other versions
EP1467070A1 (en
Inventor
Jacob Dr.Dipl.-Chemiker Eberhard
Hans-Peter Mai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roth Technik Austria GmbH
MAN Truck and Bus SE
Original Assignee
Roth Technik Austria GmbH
MAN Nutzfahrzeuge AG
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Filing date
Publication date
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Publication of EP1467070A1 publication Critical patent/EP1467070A1/en
Application granted granted Critical
Publication of EP1467070B1 publication Critical patent/EP1467070B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F01N13/017—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/16—Plurality of inlet tubes, e.g. discharging into different chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/22—Inlet and outlet tubes being positioned on the same side of the apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2510/00—Surface coverings
    • F01N2510/08—Surface coverings for corrosion prevention
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/02—Corrosion resistive metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/02—Corrosion resistive metals
    • F01N2530/04—Steel alloys, e.g. stainless steel

Definitions

  • the invention relates to a combined exhaust aftertreatment / Schalldämpfungsvoriques in the exhaust line of an internal combustion engine, in particular diesel engine of a commercial vehicle such as trucks or buses with features according to the preamble of claim 1.
  • WO-A-03018971 discloses an exhaust aftertreatment device for the exhaust gases of a diesel engine, in whose exhaust line a catalyst housing is arranged. In this are at the beginning of two adjacent parallel flowed oxidation catalysts and spaced apart in terms of flow next to each other at least three, also flowed through parallel particle filter. In this case, their installation is such that the housing of each particulate filter outside either unpurified or purified exhaust gas for keeping warm the particulate filter are flowed around.
  • WO-A-0211862 discloses a silencer with built-in particulate filter cartridges with internal NO x reductants.
  • the particulate filter cartridges are not installed in housings so that the exhaust gas can flow freely through the particulate filters from radially outside to inside.
  • the object of the invention is derived, namely, to create opportunities for exhaust aftertreatment / Schalldämpfungsvoriquesen of the generic type with constructive measures with which the problem of sulfuric acid corrosion can be remedied cost-reducing.
  • An essential principle of the invention is that the sulfuric acid-forming exhaust aftertreatment takes place within the muffler in at least one exhaust aftertreatment / Schalldämpfungsmodul and only made of it to be purified exhaust gas housing made of ferritic or austenitic stainless steel and it is thereby possible, the outer walls of the muffler and each internal organ in this, such as the transverse wall, which is outside the exhaust aftertreatment / noise attenuation module, made of unalloyed, aluminized or otherwise coated steel sheet.
  • the latter requires lower material costs and lower tooling costs for the silencer and, seen as a whole, also lower production costs for the overall exhaust aftertreatment / noise damping system.
  • the combined exhaust aftertreatment / Schalldämpfungsvortechnische invention is arranged in the exhaust system of an internal combustion engine, in which it is z. B. may be a diesel engine of a commercial vehicle such as trucks or buses.
  • This exhaust aftertreatment / Schalldämpfungsvortechnisch is modular.
  • the first module is in all embodiments of the invention basically the muffler 1. This is generally limited by a front end wall 2, a rear end wall 3 and a peripheral outer wall 4. This may be cylindrical and have a circular, oval, rectangular or square cross-section or be bulged barrel-shaped.
  • the third housing section 10, 10 ', 10 "adjoining the second section 9, 9', 9" receives at least one exhaust aftertreatment device 6.
  • the housing end section 11 which, after flowing through the V-cat 5 and the exhaust gas aftertreatment device (s), collects 6 purified exhaust gas which is exhausted and attenuates from the muffler 1 , 11 ', 11 ".
  • a steel with the standard designation ST 12-03. The connection between the end walls 2, 3 and the peripheral wall 4 of the muffler 1 by known methods such as folding.
  • AN / SD module 7 consists in the first construction principle of a composite of two parts housing.
  • the division of the housing is useful in two places, the interface may be either between the second housing portion 8 and third housing portion 9 or between the third housing portion 10 and the fourth, ie the housing end portion 11.
  • the two first housing sections 8 and 9 and the two remaining housing sections 10 and 11 each form a housing part to be prefabricated.
  • the first three housing sections 8, 9, 10 and the housing end section 11 each form a housing to be prefabricated, the latter being the more preferred version.
  • the first housing section 8 is formed here circular cylindrical and hugs the outside of the built-in it V-Kat 5 at.
  • the second, the overflow chamber 12 limiting housing portion 9 connects coaxially to the first housing portion 8 at.
  • the third housing section 10 which has a circular-cylindrical shape and has a substantially larger diameter than the first housing section 8, adjoins the outside of the exhaust-gas aftertreatment device 6 built into it.
  • the fourth, so the end portion 11 of the housing closes with its funnel-shaped tapered beginning portion 11/1 coaxial with the same diameter, starting from the diameter of the third housing portion 10 latter and merges into a circular cylindrical tailpipe 11/2, with which he gas-tight out of the muffler 1 is led to the outside.
  • the two housing parts form together with the built-V-Kat 5 and exhaust aftertreatment device 6 each independent of the other to be produced sub-module within the AN / SD module 7.
  • the two sub-modules are combined in the final assembly at the intended interface, the connection to the abutting housing sections either gas tight tight, z. B. by welding, or via a gas-tight connection mechanism releasably connected to each other.
  • the detachable connection is more expensive, but allows in the case of a defect, a quick replacement of the exhaust aftertreatment device. 6
  • the housing end portion 11 may be wholly or partially perforated for the purpose of soundproofing or equipped with individual holes 14 - see Fig. 8, 9, 10, 11, 14, 15 and / or outside either along its entire length or only a partial length Schalldämpfungs- or absorption material 15 to be coated - see Fig. 7, 8, 9, 10, 11, 12, 14, 15.
  • the two sub-modules form a prefabricated AN / SD module 7, which is then installed as a system core in the muffler 1.
  • installation position of the AN / SD module 7 can be attenuated with this due to its design according to the invention in the region of its housing end portion 11 with the enormously large free cross-section of the funnel absorption path of the muzzle sound especially in the high and medium frequency range without noticeable pressure loss. This is not done as usual by reflection of the sound waves, but by converting the sound energy into heat.
  • Fig. 1 shows the inlet pipe 13 centrally disposed in the front end wall 2 of the muffler 1 and coaxially aligned to the AN / SD module 7 installed in the muffler 1 and with centrally through the rear end wall 3 of the muffler 1 gas-tight led out end pipe 11 / second
  • the AN / SD module 7 is held approximately in the middle of its length by a non-gas-tight transverse wall 16 in the installed position, which is perforated or has breakthroughs, so that the AN / SD module 7 on the entire installation length in the muffler 1 outside of exhaust gas for its preheating is um Jardinbar.
  • the transverse wall 16 also forms a muffler in the muffler 1. After installation of the AN / SD module 7 in the muffler interior, the rear end wall 3 of the muffler 1 with its peripheral outer wall 4 z. B. connected by crimping the edge.
  • transverse walls 17, 18 Internally of the muffler 1 of the AN / SD module 7 is held by two axially spaced apart transverse walls 17, 18 in the installed position, these two transverse walls 17, 18 divide the muffler interior into three chambers, namely a front Abgaseinströmhunt 19, a middle Heat chamber 20 and a rear transfer chamber 21.
  • a the two transverse walls 17, 18 penetrating pipe 22 passes the fed via the inlet pipe 13 into the exhaust gas inlet 19 exhaust gas from this to the transfer chamber 21 on from where it then flows in the opposite direction the AN / SD module 7 for its purification.
  • the transverse wall 17 is preferably gas-tight, the transverse wall 18, however, is preferably gas-permeable, z. B. perforated or provided with openings.
  • the transverse walls 17, 18 and the tube 22 also form Schalldämpfungsorgane in the muffler. 1
  • Fig. 5 shows the AN / SD module 7 in the same way in the muffler 1 as in the case of Fig. 1, 2 installed.
  • the inlet pipe 13 is relatively far extended centrally into the interior of the muffler 1, where it passes through a transverse wall 16 parallel to the second transverse wall 23 and perforated in the area between this transverse wall 23 and the front end wall 2 of the muffler 1 or holes 24th Mistake.
  • the transverse walls 16, 23 are both gas permeable, z. B. over several openings, and together with the perforated inlet pipe 13 on the one hand silencer elements, on the other hand room divider in the muffler 1, whereby the interior is divided into a front chamber 25, middle chamber 26 and rear chamber 27.
  • the exhaust gas is introduced with a small proportion of the holes 24 in the front chamber 25, with the largest proportion but in the middle chamber 26 and then flows through there from the AN / SD module. 7
  • Fig. 6 shows the inlet pipe 13 eccentrically and parallel to the longitudinal axis LA of the muffler 1 relatively far into this to about the middle of its longitudinal extent projecting and there by two widely spaced, through perforations or openings gas permeable transverse walls 28, 29 passed.
  • These transverse walls 28, 29 serve as a muffler-internal support on the one hand for the inlet pipe 13, on the other hand, the next, also eccentric and parallel to the longitudinal axis of the muffler 1 in this built-in AN / SD module 7.
  • the two transverse walls 28, 29 divide the muffler interior into a front chamber 30, middle chamber 31 and rear chamber 32.
  • the inlet tube 13 is in the region of the front and middle chambers 30, 31 perforated or provided with holes 33, 34, so that the exhaust gas via the inlet tube 13 substantially in the rear chamber 32 can be fed, but partially also through the holes 33, 34 in the front and middle chambers 30, 31 can occur.
  • the input section 8 of the housing on the inlet side before the installation area of the V-Kat 5 extended forward to the front transverse wall 28 and perforated in this area or provided with holes 35.
  • the exhaust gas fed into the muffler 1 flows from the rear chamber 32 via the middle chamber 31 to the front chamber 30 and from there through an opening 36 in the front transverse wall 28 and from the middle chamber 31 via the holes 35 in the AN / SD module 7 and leaves this cleaned after its flow through its in the rear end wall 3 of the muffler 1 gas-tight led out end pipe 11/2.
  • the transverse walls 28, 29 and the internal part of the inlet pipe 13 also serve for soundproofing.
  • Fig. 7 shows an embodiment of the AN / SD module 7, in which the housing end portion 11 has a U-shaped course with which the purified exhaust via the tailpipe 11/2 on the side of entry again from the muffler 1 ausleitbar is.
  • the inlet pipe 13 eccentrically penetrates the front end wall 3 and projects only slightly into the interior of the muffler 1.
  • the housing sections 8, 9, 10 and 11/1 of the AN / SD module extend 7.
  • a gas-permeable by perforation or openings made transverse wall 37 provided.
  • the first housing portion 8 and in an upper opening the end tube 11/2 of the housing portion 11 is supported.
  • the transverse wall 37 divides the muffler interior into a front chamber 38 and rear chamber 39 and serves together with the relatively long tail pipe 11/2 for soundproofing.
  • Fig. 8 shows the AN / SD module 7 in comparison with the example of FIG. 1 axially closer to the inlet pipe 13 and designed with a longer end pipe 11/2.
  • the housing end portion 11 is provided with a perforation or holes 14 and coated over almost its entire length with an outer layer 15 of Schalldämpfungs- or absorption material.
  • the embodiment according to FIG. 9 differs from that according to FIG. 8 in that only the end tube 11/2 is provided with a perforation or holes 14 and is coated on the outside with a layer 15 of damping or absorption material.
  • FIG. 10 differs from that according to FIG. 8 in that a Venturi nozzle 40, which contributes to a further reduction of the sound level at the outlet, is installed in the end pipe 11/2 of the housing end section 11.
  • the part 11/1 of the housing end section 11 is composed of individually produced double half-shells which after their assembly and insertion of the end pipe 11/2 are combined as a united housing end section 11 are mounted on the housing portion 10, which here projects slightly beyond the transverse wall 16 and the housing end portion 11 receives on its protruding portion.
  • Fig. 13 shows an embodiment similar to that of Fig. 6.
  • the muffler 1 has no circular, but approximately rectangular cross-section.
  • In the lower part of the inlet pipe 13 is guided eccentrically and parallel to the longitudinal axis of the muffler LA in the muffler interior and penetrates there two holding him through perforation or gas-permeable holes made transverse walls 41, 42.
  • This AN / SD module 7 is that of 12, the end tube 11/2 of the housing end portion 11 is not straight, but angled and led out approximately at the level of the inlet tube 13 laterally through the circumferential outer wall 4 of the muffler 1.
  • This AN / SD module 7 is installed in the silencer 1 in such a way that its housing parts 8, 9, 10 with the installed V-type catalytic converter 5 and exhaust aftertreatment device 6 extend in the upper region and parallel to the longitudinal axis LA of the silencer 1.
  • This AN / SD module 7, like the inlet pipe 13, is held by the transverse walls 41, 42, which, like the inlet pipe 13 and the housing end section 11, also serve to dampen noise.
  • the transverse walls 41, 42 divide the muffler interior into a front chamber 43, middle chamber 44 and rear chamber 45.
  • the inlet pipe 13 is perforated in the region of the middle (44) and rear chamber 45 or holes 46, so that Exhaust gas from the inlet pipe 13 can not only enter the rear chamber 45, but to a lesser extent laterally in the middle and rear chambers 44, 45. From there, the exhaust gas passes through the permeable transverse walls 41, 42 back into the front chamber 43, from where it can enter into the AN / SD module 7 for the flow therethrough.
  • FIG. 14 is similar to that of FIG. 8.
  • the main difference is that here the AN / SD module 7 easily replaceable in the muffler. 1 arranged and attached thereto for an end plate 47, which forms the central part of the two-part rear end wall 3 of the muffler 1 here.
  • the outer annular portion 48 of the end wall 3 is joined to the peripheral outer wall 4 by folding and the end plate 47 with the AN / SD module 7 is secured to the annular portion 48 by means of a plurality of clamping or screw 49.
  • this AN / SD module 7 could still be internally supported by the muffler 1 by a transverse wall 16 (as in FIG. 8).
  • FIGS. 15 and 16 has two AN / SD modules 7 of the type also used in FIG. 9. However, these have differently long tailpipes 11/2 at their housing end portions 11, so that they, as shown in Fig. 15, axially offset from each other, but each parallel to the longitudinal axis LA of the muffler 1 and in Axialfugion partially overlapping in the latter can be installed.
  • a non-gas-tight transverse wall 50 holds the two AN / SD modules 7 in the installed position, the other holder point for this is given by the rear end wall 3 of the muffler 1, through which they are led out gas-tight with their tailpipes 11/2.
  • FIGS. 17 to 19 show an embodiment of the invention with an AN / SD module 7 designed according to a second basic principle.
  • This AN / SD module 7 forming the system core in the silencer 1 consists of several - in the case shown four - exhaust aftertreatment modules together, which open into a housing end portion 11 '.
  • all the exhaust aftertreatment modules are preferably of the same design and configured and have in each case a separate housing at the beginning of a V-Kat 5, built-in exhaust aftertreatment device 6 and in between a funnel-shaped extending to the latter overflow chamber 12 'on.
  • the housing of this AN / SD module 7 is accordingly composed of the housings of the exhaust aftertreatment modules and the common housing end section 11 '.
  • the latter surrounds in this type of AN / SD module 7 with its substantially rectangular initial region 11/1 'the third housing sections 10' of the exhaust aftertreatment modules outside peripherally and nestles with its rounded corner areas - as shown in FIG Peripheral sections of the same form fit.
  • this housing end portion 11 frontally gas-tight or attached via a gas-tight, but releasable connection mechanism to the transverse wall 51.
  • This transverse wall 54 separates in the muffler 1 a front Abgaseinströmhunt 55 from a rear chamber 56. Furthermore, this AN / SD module 7 has a plurality of exhaust aftertreatment modules - in the illustrated example two - each of which in a sub-housing 10 "a built-exhaust aftertreatment 6th Each of these exhaust aftertreatment modules communicates with its sub-housing 10 "via a coaxial aperture 57 in the transverse wall 54 with the overflow chamber 12" and is connected with its partial housing 10 "gas-tight on the transverse wall 54.
  • each of these exhaust aftertreatment modules with an outer peripheral portion of its housing 10" form fit to a inner circumferential region of the housing end portion 11 "nestled, the outer circumferential surrounds this sub-housing 10" of the exhaust aftertreatment modules with its cylindrical, oval here in cross-section here, also gas-tight front side gas-tight or via a gas-tight, but releasable connection mechanism on the transverse wall 54th
  • the housing end section 11 "tapers, with its central region 11/2" adjoining the starting region 11/1 "toward an end region 11/3" which in the example shown is formed by a circular-cylindrical end tube with which the Housing end portion 11 "is led out of the muffler 1 gas-tight.
  • the housing sections 8 "and 9" form with the initially installed V-Kat 5 also a prefabricated module, which is then combined with the transverse wall 54.
  • the respective housing end section 11 'or 11 is in the region of its start and middle part 11/1', 11/1" and 11/2 ', 11/2 "preferably realized in a two-ply half-shell construction, ie in each case a prefabricated inner and outer upper half-shell is combined with an inner and outer lower half-shell, in which then double-walled part of the tailpipe 11/3 'and 11/3" is installed gas-tight.

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

Abstract

The combined internal combustion engine exhaust gas re-treatment/sound damping arrangement has a sound damper (1) bounded by front and read end walls and a peripheral outer wall with at least one pre-oxidation catalyzer (5) and at least one re-treatment device. At least one exhaust gas re-treatment/sound damping module (7) is fitted in the sound damper as the core of the system.

Description

Die Erfindung betrifft eine kombinierte Abgasnachbehandlungs-/Schalldämpfungsvorrichtung im Abgasstrang einer Brennkraftmaschine, insbesondere Dieselmotor eines Nutzfahrzeugs wie Lastkraftwagen oder Omnibus mit Merkmalen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a combined exhaust aftertreatment / Schalldämpfungsvorrichtung in the exhaust line of an internal combustion engine, in particular diesel engine of a commercial vehicle such as trucks or buses with features according to the preamble of claim 1.

Kombinierte Abgasnachbehandlungs-/Schalldämpfungsvorrichtungen der gattungsgemäßen Art sind beispielsweise auf dem 23. Internationalen Wiener Motorensymposium am 25. und 26.04.2002 offenbart und in den Fortschrittsberichten, VDI-Reihe 12 Nr. 490, Band 2 Düsseldorf, VDI-Verlag 2002, Seiten 196-216 dokumentiert worden. Dabei wurde ein System vorgestellt, bei dem in einem Schalldämpfer vier Abgasnachbehandlungsmodule für Paralleldurchströmung angeordnet sind, wobei jeder derselben in einem Mantelrohr eingefasst einen kreiszylindrischen Voroxidationskatalysator und unmittelbar koaxial anschließend einen durchmesseridentischen kreiszylindrischen Partikelabscheider aufweist.Combined exhaust aftertreatment / Schalldämpfungsvorrichtungen of the generic type are disclosed for example at the 23rd International Vienna Motor Symposium on 25 and 26.04.2002 and in the progress reports, VDI series 12 No. 490, Volume 2 Dusseldorf, VDI-Verlag 2002, pages 196- 216 has been documented. In this case, a system was presented in which four exhaust aftertreatment modules are arranged for parallel flow in a muffler, each of which enclosed in a jacket tube a circular cylindrical pre-oxidation and immediately coaxial then has a diameter-identical circular cylindrical particle.

Darüber hinaus offenbart die WO-A-03018971 eine Abgasnachbehandlungseinrichtung für die Abgase eines Dieselmotors, in dessen Abgasleitung ein Katalysatorgehäuse angeordnet ist. In dieses sind eingangs nebeneinander zwei parallel durchströmte Oxidationskatalysatoren und beabstandet strömungsmäßig danach nebeneinander wenigstens drei, ebenfalls parallel durchströmte Partikelfilter eingebaut. Dabei ist deren Einbau so, dass das Gehäuse jedes Partikelfilters außen entweder von ungereinigtem oder gereinigtem Abgas zur Warmhaltung der Partikelfilter umströmbar sind.In addition, WO-A-03018971 discloses an exhaust aftertreatment device for the exhaust gases of a diesel engine, in whose exhaust line a catalyst housing is arranged. In this are at the beginning of two adjacent parallel flowed oxidation catalysts and spaced apart in terms of flow next to each other at least three, also flowed through parallel particle filter. In this case, their installation is such that the housing of each particulate filter outside either unpurified or purified exhaust gas for keeping warm the particulate filter are flowed around.

Des Weiteren offenbart die WO-A-0211862 einen Schalldämpfer mit eingebauten Partikelfilterkartuschen mit inneren NOx-Reduktionsmitteln. Die Partikelfilterkartuschen sind nicht in Gehäuse eingebaut, so dass das Abgas die Partikelfilter frei von radial außen nach innen durchströmen kann.Furthermore, WO-A-0211862 discloses a silencer with built-in particulate filter cartridges with internal NO x reductants. The particulate filter cartridges are not installed in housings so that the exhaust gas can flow freely through the particulate filters from radially outside to inside.

Bedingt durch die Verwendung schwefelhaltiger Kraftstoffe entsteht bei der Oxidation des Abgases Schwefelsäure, die innerhalb des Abgasnachbehandlungs-/Schalldämpfungssystems stark korrosiv wirksam ist. Begegnet wurde dieser schwefelsäurebedingten Korrosionsbildung durch Verwendung von hochwertigen austenitischen Edelstahl-Werkstoffen bei der Herstellung der Abgasnachbehandlungs- und Schalldämpfungsvorrichtungen. Diese austenitischen Edelstähle sind im Vergleich zu Baustählen erheblich teurer und erfordern für die Verarbeitung entsprechender Halbzeuge wie Bleche auch wesentlich kompliziertere und teurere Werkzeuge, was in Gesamtheit somit relativ hohe Fertigungskosten für solche schwefelsäureresistente Systeme bedingt. Im Vergleich zu Abgasnachbehandlungs-/Schalldämpfungssystemen, die keine schwefelsäureresistente Ausgestaltung erfordern, erhöhen sich die Systemkosten bei schwefelsäureresistenter Ausführung um Faktor 3 bis 5.Due to the use of fuels containing sulfur, the oxidation of the exhaust gas produces sulfuric acid, which has a highly corrosive effect within the exhaust aftertreatment / noise damping system. This sulfuric acid-related corrosion formation was countered by the use of high-grade austenitic stainless steel materials the manufacture of the exhaust aftertreatment and sound attenuation devices. These austenitic stainless steels are considerably more expensive compared to structural steels and also require considerably more complicated and expensive tools for processing corresponding semi-finished products, such as metal sheets, which, as a whole, results in relatively high production costs for such sulfuric-acid-resistant systems. Compared to exhaust aftertreatment / noise reduction systems that do not require sulfuric acid resistant design, system cost increases by a factor of 3 to 5 in sulfuric acid resistant design.

Aus diesem Sachverhalt heraus leitet sich die Aufgabe der Erfindung ab, nämlich, bei Abgasnachbehandlungs-/Schalldämpfungsvorrichtungen der gattungsgemäßen Art mit konstruktiven Maßnahmen Möglichkeiten zu schaffen, mit denen dem Problem schwefelsäurebedingter Korrosion kostensenkend abgeholfen werden kann.For this fact, the object of the invention is derived, namely, to create opportunities for exhaust aftertreatment / Schalldämpfungsvorrichtungen of the generic type with constructive measures with which the problem of sulfuric acid corrosion can be remedied cost-reducing.

Diese Aufgabe ist erfindungsgemäß durch die im Anspruch 1 Maßnahmen konstruktiver und materialmäßiger Art gelöst.This object is achieved by the measures in claim 1 constructive and material type.

Vorteilhafte Ausführungsformen und Details der erfindungsgemäßen Lösung sind in den abhängigen Ansprüchen angegeben.Advantageous embodiments and details of the solution according to the invention are specified in the dependent claims.

Ein wesentlicher Grundgedanke der Erfindung besteht darin, dass die schwefelsäurebildende Abgasnachbehandlung innerhalb des Schalldämpfers in wenigstens einem Abgasnachbehandlungs-/Schalldämpfungsmodul stattfindet und nur dessen von zu reinigendem Abgas durchströmtes Gehäuse aus ferritischen oder austenitischen Edelstahl hergestellt und es dadurch möglich ist, die äußeren Wände des Schalldämpfers sowie jedes innere Organ in diesem wie Querwand, das außerhalb des Abgasnachbehandlungs-/Schalldämpfungsmoduls gegeben ist, aus unlegiertem, aluminiertem oder anderweitig beschichtetem Stahlblech herzustellen. Letzteres erfordert geringere Materialkosten und geringere Werkzeugkosten für den Schalldämpfer sowie in Gesamtheit gesehen auch geringere Herstellkosten für das Gesamtsystem Abgasnachbehandlung/Schalldämpfung.An essential principle of the invention is that the sulfuric acid-forming exhaust aftertreatment takes place within the muffler in at least one exhaust aftertreatment / Schalldämpfungsmodul and only made of it to be purified exhaust gas housing made of ferritic or austenitic stainless steel and it is thereby possible, the outer walls of the muffler and each internal organ in this, such as the transverse wall, which is outside the exhaust aftertreatment / noise attenuation module, made of unalloyed, aluminized or otherwise coated steel sheet. The latter requires lower material costs and lower tooling costs for the silencer and, seen as a whole, also lower production costs for the overall exhaust aftertreatment / noise damping system.

Im Rahmen des erfindungsgemäßen Grundprinzips ist es in vorteilhafter Weise möglich, den Abgasnachbehandlungs-/Schalldämpfungsmodul den Anforderungen seines Einsatzes entsprechend auszugestalten, wobei in dieser Anmeldung drei Grundprinzipien aufgezeigt sind, die ebenfalls erfinderischer Natur sind.In the context of the basic principle according to the invention, it is advantageously possible to design the exhaust aftertreatment / sound attenuation module according to the requirements of its use, which in this application three basic principles are shown, which are also inventive in nature.

Nachfolgend ist die erfindungsgemäße Lösung anhand der Zeichnung noch näher erläutert. In der Zeichnung zeigen:

Fig. 1
einen Längsschnitt und Fig. 2 einen Querschnitt durch ein erstes Ausführungsbeispiel der Erfindung mit einem nach einem ersten Grundprinzip gestalteten Abgasnachbehandlungs-/Schalldämpfungsmodul, der in Fig. 3 einzeln im Längsschnitt dargestellt ist,
Fig. 4 bis 14
im Längsschnitt jeweils ein weiteres Ausführungsbeispiel der Erfindung mit einem Abgasnachbehandlungs-/Schalldämpfungsmodul der in Fig. 3 dargestellten Bauart,
Fig. 15
im Längsschnitt und Fig. 16 im Querschnitt ein weiteres Ausführungsbeispiel der Erfindung mit zwei Abgasnachbehandlungs-/Schalldämpfungsmodulen der in Fig. 3 gezeigten Bauart,
Fig. 17
einen Längsschnitt und Fig. 18 einen Querschnitt durch ein weiteres Ausführungsbeispiel der Erfindung mit einen nach einem zweiten Grundprinzip gestalteten Abgasnachbehandlungs-/Schalldämpfungsmodul, der in Fig. 19 einzeln im Längsschnitt dargestellt ist,
Fig. 20
einen Längsschnitt und Fig. 21 einen Querschnitt durch ein weiteres Ausführungsbeispiel der Erfindung mit einem nach einem dritten Grundprinzip gestalteten Abgasnachbehandlungs-/Schalldämpfungsmodul, der in Fig. 22 einzeln im Längsschnitt dargestellt ist.
The solution according to the invention is explained in more detail below with reference to the drawing. In the drawing show:
Fig. 1
2 shows a cross-section through a first exemplary embodiment of the invention with an exhaust-gas aftertreatment / sound-damping module designed according to a first basic principle, which is shown individually in longitudinal section in FIG. 3, FIG.
4 to 14
in longitudinal section in each case a further embodiment of the invention with an exhaust aftertreatment / Schalldämpfungsmodul of the type shown in Fig. 3,
Fig. 15
16 shows in cross-section a further exemplary embodiment of the invention with two exhaust-gas aftertreatment / noise-damping modules of the type shown in FIG. 3, FIG.
Fig. 17
18 shows a cross-section through a further exemplary embodiment of the invention with an exhaust-gas aftertreatment / sound-damping module designed according to a second basic principle, which is shown individually in longitudinal section in FIG. 19, FIG.
Fig. 20
a longitudinal section and Fig. 21 shows a cross section through a further embodiment of the invention with a designed according to a third basic principle Abgasnachbehandlungs- / Schalldämpfungsmodul, which is shown in Fig. 22 individually in longitudinal section.

Die erfindungsgemäße kombinierte Abgasnachbehandlungs-/Schalldämpfungsvorrichtung ist im Abgasstrang einer Brennkraftmaschine angeordnet, bei der es sich z. B. um einen Dieselmotor eines Nutzfahrzeugs wie Lastkraftwagen oder Omnibus handeln kann. Diese Abgasnachbehandlungs-/Schalldämpfungsvorrichtung ist modular aufgebaut.The combined exhaust aftertreatment / Schalldämpfungsvorrichtung invention is arranged in the exhaust system of an internal combustion engine, in which it is z. B. may be a diesel engine of a commercial vehicle such as trucks or buses. This exhaust aftertreatment / Schalldämpfungsvorrichtung is modular.

Der erste Modul ist bei allen Ausführungsformen der Erfindung grundsätzlich der Schalldämpfer 1. Dieser ist räumlich generell durch eine vordere Stirnwand 2, eine hintere Stirnwand 3 und eine Umfangsaußenwand 4 begrenzt. Diese kann zylindrisch sein und einen kreisförmigen, ovalen, rechteckigen oder quadratischen Querschnitt aufweisen oder auch tonnenförmig ausgebuchtet sein.The first module is in all embodiments of the invention basically the muffler 1. This is generally limited by a front end wall 2, a rear end wall 3 and a peripheral outer wall 4. This may be cylindrical and have a circular, oval, rectangular or square cross-section or be bulged barrel-shaped.

Im Innenraum des Schalldämpfers 1 ist wenigstens ein den NO2-Anteil im durchströmenden Abgas erhöhender Voroxidationskatalysator - nachfolgend V-Kat 5 genannt - und strömungsmäßig diesem nachfolgend wenigstens ein Abgasnachbehandlungsorgan 6 vorgesehen, bei dem es sich um einen katalytischen oder nicht-katalytischen Partikelabscheider oder Katalysator handeln kann.In the interior of the muffler 1 is at least one the NO 2 content in the flowing exhaust increasing pre-oxidation catalyst - hereinafter called V-Kat 5 - and fluidly this subsequently provided at least one exhaust aftertreatment device 6, which is a catalytic or non-catalytic particle separator or catalyst can act.

Der bzw. alle V-Kat 5 und das bzw. alle Abgasnachbehandlungsorgan(e) 6 sind integraler Bestandteil wenigstens eines erfindungsgemäß als Systemkern in den Schalldämpfer 1 eingebauten Abgasnachbehandlungs-/Schalldämpfungsmoduls, der nachfolgend abgekürzt als AN-/SD-Modul 7 bezeichnet ist.The or all V-Kat 5 and the or all exhaust aftertreatment device (s) 6 are an integral part of at least one according to the invention as a system core in the muffler 1 built exhaust aftertreatment / Schalldämpfungsmoduls, hereinafter referred to abbreviated as AN / SD module 7.

Erfindungsgemäß weist der AN-/SD-Modul 7 ein aus mehreren Teilen zusammengesetztes Gehäuse auf, das je nach den drei dargestellten Bauprinzipien - siehe Fig. 3, Fig. 19, Fig. 22 - unterschiedlich gestaltet, aufgeteilt und zusammengebaut ist. Unabhängig von den unterschiedlichen Details weist das Gehäuse vier aufeinanderfolgende Abschnitte 8, 9, 10, 11 (Fig. 1 bis 16) bzw. 8', 9', 10', 11' (Fig. 17 bis 19) bzw. 8", 9", 10", 11" (Fig. 20 bis 22) auf. Dabei ist in dem ersten Gehäuse-Abschnitt 8, 8', 8" wenigstens ein V-Kat 5 eingebaut. Der sich an den ersten Abschnitt 8, 8', 8" anschließende zweite Gehäuse-Abschnitt 9, 9', 9" erweitert sich trichterförmig auf einen größeren Querschnitt und bildet eine Überströmkammer 12, 12', 12". Der sich an den zweiten Abschnitt 9, 9', 9" anschließende dritte Gehäuse-Abschnitt 10, 10', 10" nimmt wenigstens ein Abgasnachbehandlungsorgan 6 auf. An den dritten Gehäuse-Abschnitt 10, 10', 10" schließt sich ein, das nach Durchströmen des/der V-Kat 5 und des/der Abgasnachbehandlungsorgan(e) 6 gereinigte Abgas sammelnde und gedämpft aus dem Schalldämpfer 1 ausleitender Gehäuse-Endabschnitt 11, 11', 11" an. Auf die unterschiedlichen Ausgestaltungen der verschiedenen Bauarten ist weiter hinten noch näher eingegangen.According to the invention, the AN / SD module 7 has a housing composed of several parts, which, depending on the three design principles illustrated - see FIGS. 3, 19, 22 - differently designed, divided and assembled. Regardless of the different details, the housing has four successive sections 8, 9, 10, 11 (FIGS. 1 to 16) and 8 ', 9', 10 ', 11' (FIGS. 17 to 19) and 8 ", respectively, 9 ", 10", 11 "(Figures 20 to 22). At least one V-cat 5 is installed in the first housing section 8, 8 ', 8 ", and the second housing section 9, 9', 9" adjoining the first section 8, 8 ', 8 "expands funnel-shaped to a larger cross section and forms a transfer chamber 12, 12 ', 12 ". The third housing section 10, 10 ', 10 "adjoining the second section 9, 9', 9" receives at least one exhaust aftertreatment device 6. The third housing section 10, 10 ', 10 "is followed by the housing end section 11 which, after flowing through the V-cat 5 and the exhaust gas aftertreatment device (s), collects 6 purified exhaust gas which is exhausted and attenuates from the muffler 1 , 11 ', 11 ". On the different configurations of the different types is discussed in more detail later.

Erfindungsgemäß sind alle Teile bzw. Abschnitte 8, 9, 10, 11 bzw. 8', 9', 10', 11' bzw. 8", 9", 10", 11" des Gehäuses des AN-/SD-Moduls 7 aus schwefelsäureresistentem ferritischen oder austenitischem Edelstahl hergestellt, wohingegen alle äußeren Wände 2, 3, 4, ein Eintrittsrohr 13 und jedes innere Organ wie Quer- oder Stützwand des Schalldämpfers 1, das außerhalb des AN-/SD-Moduls 7 gegeben ist, aus unlegiertem und zu Korrosionsschutzzwecken aluminierten oder auch mit anderem Korrosionsschutzmaterial beschichteten Stahlblech hergestellt sind, z. B. einem Stahl mit der Normbezeichnung ST 12-03. Die Verbindung zwischen den Stirnwänden 2, 3 und der Umfangswand 4 des Schalldämpfers 1 erfolgt durch bekannte Methoden wie Falzen. Der solchermaßen aus relativ billigem Stahlmaterial herstellbare Schalldämpfer 1 dient somit als Canning für den materialmäßig höherwertigeren und kostenintensiveren, durch den/die AN-/SD-Modul(e) 7 gebildeten Systemkern und schützt diesen im betrieblichen Einsatz vor mechanischen Einwirkungen. Außerdem dient der Schalldämpfer 1, der vorzugsweise auch als Hochpaßfilter für den tieffrequenten Schalldämpfungsbereich dienende Einbauten aufweist, als Vorwärmkammer für den/die AN-/SD-Modul(e) 7 und sorgt für eine optimale Temperatur rund um letztere(n).According to the invention, all parts or sections 8, 9, 10, 11 or 8 ', 9', 10 ', 11' or 8 ", 9", 10 ", 11" of the housing of the AN / SD module 7 made of sulfuric acid-resistant ferritic or austenitic stainless steel, whereas all outer walls 2, 3, 4, an inlet pipe 13 and any internal member such as transverse or support wall of the muffler 1, which is outside the AN / SD module 7, made of non-alloy and for anti-corrosion purposes aluminized or coated with other corrosion protection material steel sheet are made, for. As a steel with the standard designation ST 12-03. The connection between the end walls 2, 3 and the peripheral wall 4 of the muffler 1 by known methods such as folding. The thus produced from relatively cheap steel material muffler 1 thus serves as Canning for the material quality and more costly, formed by the / the AN / SD module (s) 7 system core and protects it in operational use against mechanical effects. In addition, the muffler 1, which preferably also has as a high-pass filter for the low-frequency silencing area serving internals, as a preheating chamber for / the AN / SD module (s) 7 and ensures an optimum temperature around the latter (s).

Nachfolgend ist auf die drei verschiedenen Bauprinzipien der AN-/SD-Module 7 näher eingegangen.Below, the three different construction principles of the AN / SD modules 7 are discussed in more detail.

Der in Einzelheit in Fig. 3 dargestellte AN-/SD-Modul 7 besteht beim ersten Bauprinzip aus einem aus zwei Teilen zusammengesetztem Gehäuse. Die Teilung des Gehäuses ist an zwei Stellen sinnvoll, wobei die Schnittstelle entweder zwischen dem zweiten Gehäuse-Abschnitt 8 und dritten Gehäuse-Abschnitt 9 oder zwischen dem dritten Gehäuse-Abschnitt 10 und dem vierten, also dem Gehäuse-Endabschnitt 11 liegen kann. Es bilden also entweder die beiden ersten Gehäuse-Abschnitte 8 und 9 und die beiden restlichen Gehäuse-Abschnitte 10 und 11 jeweils einen vorzufertigenden Gehäuseteil. Alternativ bilden die ersten drei Gehäuse-Abschnitte 8, 9, 10 und der Gehäuse-Endabschnitt 11 jeweils ein vorzufertigendes Gehäuseteü, wobei die zuletzt genannte die bevorzugtere Version ist. Der erste Gehäuse-Abschnitt 8 ist hier kreiszylindrisch ausgebildet und schmiegt sich außen an den in ihn eingebauten V-Kat 5 an. Der zweite, die Überströmkammer 12 begrenzende Gehäuse-Abschnitt 9 schließt sich koaxial am ersten Gehäuse-Abschnitt 8 an. An diesen schließt sich koaxial der kreiszylindrisch ausgebildete und einen wesentlich größeren Durchmesser als der erste Gehäuse-Abschnitt 8 aufweisende dritte Gehäuse-Abschnitt 10 an, der sich außen an das in ihn eingebaute Abgasnachbehandlungsorgan 6 anschmiegt. Der vierte, also der Endabschnitt 11 des Gehäuses schließt sich mit seinem sich trichterförmig verjüngenden Anfangsabschnitt 11/1 koaxial mit gleichem Durchmesser ausgehend vom Durchmesser des dritten Gehäuse-Abschnitts 10 letzterem an und geht in ein kreiszylindrisches Endrohr 11/2 über, mit dem er gasdicht aus dem Schalldämpfer 1 nach außen geführt ist. Die beiden Gehäuseteile bilden zusammen mit dem eingebauten V-Kat 5 und Abgasnachbehandlungsorgan 6 jeweils einen unabhängig vom anderen herzustellenden Teilmodul innerhalb des AN-/SD-Moduls 7. Die beiden Teilmodule werden bei der Endmontage an der vorgesehenen Schnittstelle vereinigt, wobei die Verbindung an den aneinander anstoßenden Gehäuse-Abschnitten entweder gasdicht fest, z. B. durch Schweißen, oder über einen gasdichten Verbindungsmechanismus lösbar miteinander verbunden werden. Die lösbare Verbindung ist teurer, ermöglicht aber im Falle eines Defektes ein schnelles Austauschen des Abgasnachbehandlungsorgans 6.The illustrated in detail in Fig. 3 AN / SD module 7 consists in the first construction principle of a composite of two parts housing. The division of the housing is useful in two places, the interface may be either between the second housing portion 8 and third housing portion 9 or between the third housing portion 10 and the fourth, ie the housing end portion 11. Thus, either the two first housing sections 8 and 9 and the two remaining housing sections 10 and 11 each form a housing part to be prefabricated. Alternatively, the first three housing sections 8, 9, 10 and the housing end section 11 each form a housing to be prefabricated, the latter being the more preferred version. The first housing section 8 is formed here circular cylindrical and hugs the outside of the built-in it V-Kat 5 at. The second, the overflow chamber 12 limiting housing portion 9 connects coaxially to the first housing portion 8 at. Coaxially with this, the third housing section 10, which has a circular-cylindrical shape and has a substantially larger diameter than the first housing section 8, adjoins the outside of the exhaust-gas aftertreatment device 6 built into it. The fourth, so the end portion 11 of the housing closes with its funnel-shaped tapered beginning portion 11/1 coaxial with the same diameter, starting from the diameter of the third housing portion 10 latter and merges into a circular cylindrical tailpipe 11/2, with which he gas-tight out of the muffler 1 is led to the outside. The two housing parts form together with the built-V-Kat 5 and exhaust aftertreatment device 6 each independent of the other to be produced sub-module within the AN / SD module 7. The two sub-modules are combined in the final assembly at the intended interface, the connection to the abutting housing sections either gas tight tight, z. B. by welding, or via a gas-tight connection mechanism releasably connected to each other. The detachable connection is more expensive, but allows in the case of a defect, a quick replacement of the exhaust aftertreatment device. 6

Der Gehäuse-Endabschnitt 11 kann zum Zwecke der Schalldämpfung ganz oder teilweise perforiert oder mit einzelnen Löchern 14 ausgestattet sein - siehe Fig. 8, 9, 10, 11, 14, 15-und/oder außen entweder auf ganzer Länge oder nur einer Teillänge mit Schalldämpfungs- bzw. Absorptionsmaterial 15 beschichtet sein - siehe Fig. 7, 8, 9, 10, 11, 12, 14, 15.The housing end portion 11 may be wholly or partially perforated for the purpose of soundproofing or equipped with individual holes 14 - see Fig. 8, 9, 10, 11, 14, 15 and / or outside either along its entire length or only a partial length Schalldämpfungs- or absorption material 15 to be coated - see Fig. 7, 8, 9, 10, 11, 12, 14, 15.

Nach ihrer Zusammenfügung und der Anbringung etwaigen Schalldämpfungs- bzw. Absorptionsmaterials 15 bilden die beiden Teilmodule einen vorgefertigten AN-/SD-Modul 7, der dann als Systemkern in den Schalldämpfer 1 eingebaut wird. In Einbaulage des AN-/SD-Moduls 7 kann mit diesem aufgrund seiner erfindungsgemäßen Gestaltung im Bereich seines Gehäuse-Endabschnittes 11 mit dem enorm großen freien Querschnitt der Trichter-Absorptionsstrecke der Mündungsschall vor allem im hohen und mittleren Frequenzbereich ohne merklichen Druckverlust gedämpft werden. Dies geschieht hier nicht wie üblich durch Reflexion der Schallwellen, sondern durch Umwandlung der Schallenergie in Wärme.After their assembly and the attachment of any Schalldämpfungs- or absorbent material 15, the two sub-modules form a prefabricated AN / SD module 7, which is then installed as a system core in the muffler 1. In installation position of the AN / SD module 7 can be attenuated with this due to its design according to the invention in the region of its housing end portion 11 with the enormously large free cross-section of the funnel absorption path of the muzzle sound especially in the high and medium frequency range without noticeable pressure loss. This is not done as usual by reflection of the sound waves, but by converting the sound energy into heat.

Nachstehend ist auf verschiedene Einzelheiten der den vorgeschilderten AN-/SD-Modul 7 aufweisenden Ausführungsbeispiele näher eingegangen.Below is on various details of the pre-signed AN / SD module 7 having embodiments discussed in more detail.

Fig. 1 zeigt das Eintrittsrohr 13 zentral in der vorderen Stirnwand 2 des Schalldämpfers 1 angeordnet und koaxial fluchtend hierzu den AN-/SD-Modul 7 in den Schalldämpfer 1 eingebaut und mit zentral durch die hintere Stirnwand 3 des Schalldämpfers 1 gasdicht herausgeführten Endrohr 11/2. Intern des Schalldämpfers 1 ist der AN-/SD-Modul 7 etwa in der Mitte seiner Länge durch eine nicht gasdichte Querwand 16 in Einbauposition gehalten, die perforiert ist oder Durchbrüche aufweist, sodass der AN-/SD-Modul 7 auf ganzer Einbaulänge im Schalldämpfer 1 außen von Abgas für seine Vorwärmung umspülbar ist. Die Querwand 16 bildet im Schalldämpfer 1 außerdem ein Schalldämpfungsorgan. Nach Einbau des AN-/SD-Moduls 7 in den Schalldämpferinnenraum wird die hintere Stirnwand 3 des Schalldämpfers 1 mit dessen Umfangsaußenwand 4 z. B. durch Umfalzen des Randes verbunden.Fig. 1 shows the inlet pipe 13 centrally disposed in the front end wall 2 of the muffler 1 and coaxially aligned to the AN / SD module 7 installed in the muffler 1 and with centrally through the rear end wall 3 of the muffler 1 gas-tight led out end pipe 11 / second Internally of the muffler 1, the AN / SD module 7 is held approximately in the middle of its length by a non-gas-tight transverse wall 16 in the installed position, which is perforated or has breakthroughs, so that the AN / SD module 7 on the entire installation length in the muffler 1 outside of exhaust gas for its preheating is umspülbar. The transverse wall 16 also forms a muffler in the muffler 1. After installation of the AN / SD module 7 in the muffler interior, the rear end wall 3 of the muffler 1 with its peripheral outer wall 4 z. B. connected by crimping the edge.

Fig. 4 zeigt das Eintrittsrohr 13 wahlweise entweder exzentrisch durch die vordere Stirnwand 2 oder radial durch die Umfangsaußenwand 4 gehend. Der AN-/SD-Modul 7 ist exzentrisch parallel zur Längsachse LA des Schalldämpfers 1 in dessen Innenraum eingebaut, so, dass das Endrohr 11/2 gasdicht durch die vordere Stirnwand 2 nach außen geführt und der Eintrittsquerschnitt mit größerem Abstand von der hinteren Stirnwand 3 angeordnet ist. Intern des Schalldämpfers 1 ist der AN-/SD-Modul 7 durch zwei axial voneinander beabstandete Querwände 17, 18 in Einbaulage gehalten, wobei diese beiden Querwände 17, 18 den Schalldämpfer-Innenraum in drei Kammern unterteilen, nämlich eine vordere Abgaseinströmkammer 19, eine mittlere Wärmekammer 20 und eine hintere Überleitkammer 21. Ein die beiden Querwände 17, 18 durchdringendes Rohr 22 leitet das über das Eintrittsrohr 13 in die Abgaseinströmkammer 19 eingespeiste Abgas von dieser zur Überleitkammer 21 weiter, von wo es dann in Gegenrichtung den AN-/SD-Modul 7 für seine Reinigung durchströmt. Die Querwand 17 ist vorzugsweise gasdicht, die Querwand 18 dagegen ist vorzugsweise gasdurchlässig, z. B. perforiert oder mit Durchbrüchen vorgesehen. Die Querwände 17, 18 und das Rohr 22 bilden außerdem Schalldämpfungsorgane im Schalldämpfer 1.Fig. 4 shows the inlet tube 13 optionally either eccentrically by the front end wall 2 or radially by the circumferential outer wall 4 going. The AN / SD module 7 is mounted eccentrically parallel to the longitudinal axis LA of the muffler 1 in the interior thereof, so that the tail pipe 11/2 guided gas-tight through the front end wall 2 to the outside and the inlet cross-section at a greater distance from the rear end wall. 3 is arranged. Internally of the muffler 1 of the AN / SD module 7 is held by two axially spaced apart transverse walls 17, 18 in the installed position, these two transverse walls 17, 18 divide the muffler interior into three chambers, namely a front Abgaseinströmkammer 19, a middle Heat chamber 20 and a rear transfer chamber 21. A the two transverse walls 17, 18 penetrating pipe 22 passes the fed via the inlet pipe 13 into the exhaust gas inlet 19 exhaust gas from this to the transfer chamber 21 on from where it then flows in the opposite direction the AN / SD module 7 for its purification. The transverse wall 17 is preferably gas-tight, the transverse wall 18, however, is preferably gas-permeable, z. B. perforated or provided with openings. The transverse walls 17, 18 and the tube 22 also form Schalldämpfungsorgane in the muffler. 1

Fig. 5 zeigt den AN-/SD-Modul 7 in gleicher Weise in den Schalldämpfer 1 wie im Fall von Fig. 1, 2 eingebaut. Allerdings ist hier das Eintrittsrohr 13 relativ weit zentral in den Innenraum des Schalldämpfers 1 hinein verlängert, dort endseitig durch eine zur Querwand 16 parallele zweite Querwand 23 hindurchgeführt und im Bereich zwischen dieser Querwand 23 sowie der vorderen Stirnwand 2 des Schalldämpfers 1 perforiert oder mit Löchern 24 versehen. Die Querwände 16, 23 sind beide gasdurchlässig, z. B. über mehrere Durchbrüche, und bilden zusammen mit dem perforierten Eintrittsrohr 13 einerseits Schalldämpfungselemente, andererseits Raumteiler im Schalldämpfer 1, wodurch dessen Innenraum in eine vordere Kammer 25, mittlere Kammer 26 und hintere Kammer 27 unterteilt ist. Das Abgas wird mit kleinem Anteil über die Löcher 24 in die vordere Kammer 25, mit dem größten Anteil aber in die mittlere Kammer 26 eingeleitet und durchströmt dann von dort aus den AN-/SD-Modul 7.Fig. 5 shows the AN / SD module 7 in the same way in the muffler 1 as in the case of Fig. 1, 2 installed. However, here the inlet pipe 13 is relatively far extended centrally into the interior of the muffler 1, where it passes through a transverse wall 16 parallel to the second transverse wall 23 and perforated in the area between this transverse wall 23 and the front end wall 2 of the muffler 1 or holes 24th Mistake. The transverse walls 16, 23 are both gas permeable, z. B. over several openings, and together with the perforated inlet pipe 13 on the one hand silencer elements, on the other hand room divider in the muffler 1, whereby the interior is divided into a front chamber 25, middle chamber 26 and rear chamber 27. The exhaust gas is introduced with a small proportion of the holes 24 in the front chamber 25, with the largest proportion but in the middle chamber 26 and then flows through there from the AN / SD module. 7

Fig. 6 zeigt das Eintrittsrohr 13 exzentrisch und parallel zur Längsachse LA des Schalldämpfers 1 relativ weit in diesen bis etwa zur Mitte seiner Längserstreckung hineinragend und dort durch zwei weit voneinander beabstandete, durch Perforation oder Durchbrüche gasdurchlässig ausgebildete Querwände 28, 29 hindurchgeführt. Diese Querwände 28, 29 dienen als schalldämpferinterne Halterung einerseits für das Eintrittsrohr 13, andererseits den daneben, ebenfalls exzentrisch und parallel zur Längsachse des Schalldämpfers 1 in diesen eingebauten AN-/SD-Modul 7. Die beiden Querwände 28, 29 unterteilen den Schalldämpfer-Innenraum in eine vordere Kammer 30, mittlere Kammer 31 und hintere Kammer 32. Das Eintrittsrohr 13 ist im Bereich der vorderen und mittleren Kammer 30, 31 perforiert bzw. mit Löchern 33, 34 versehen, sodass das Abgas über das Eintrittsrohr 13 im Wesentlichen zwar in die hintere Kammer 32 einspeisbar ist, partiell aber auch über die Löcher 33, 34 auch in die vordere und mittlere Kammer 30, 31 eintreten kann. Außerdem ist in diesem Beispiel der Eingangs-Abschnitt 8 des Gehäuses eintrittsseitig vor dem Einbaubereich des V-Kat 5 nach vorne bis zur vorderen Querwand 28 verlängert und in diesem Bereich perforiert oder mit Löchern 35 versehen. Das in den Schalldämpfer 1 eingespeiste Abgas strömt von der hinteren Kammer 32 über die mittlere Kammer 31 zur vorderen Kammer 30 und tritt von dort aus durch einen Durchbruch 36 in der vorderen Querwand 28 und von der mittleren Kammer 31 aus über die Löcher 35 in den AN-/SD-Modul 7 ein und verlässt diesen nach seiner Durchströmung gereinigt über dessen in der hinteren Stirnwand 3 des Schalldämpfers 1 gasdicht herausgeführtes Endrohr 11/2. Die Querwände 28, 29 und der interne Teil des Eintrittsrohrs 13 dienen außerdem zur Schalldämpfung.Fig. 6 shows the inlet pipe 13 eccentrically and parallel to the longitudinal axis LA of the muffler 1 relatively far into this to about the middle of its longitudinal extent projecting and there by two widely spaced, through perforations or openings gas permeable transverse walls 28, 29 passed. These transverse walls 28, 29 serve as a muffler-internal support on the one hand for the inlet pipe 13, on the other hand, the next, also eccentric and parallel to the longitudinal axis of the muffler 1 in this built-in AN / SD module 7. The two transverse walls 28, 29 divide the muffler interior into a front chamber 30, middle chamber 31 and rear chamber 32. The inlet tube 13 is in the region of the front and middle chambers 30, 31 perforated or provided with holes 33, 34, so that the exhaust gas via the inlet tube 13 substantially in the rear chamber 32 can be fed, but partially also through the holes 33, 34 in the front and middle chambers 30, 31 can occur. In addition, in this example, the input section 8 of the housing on the inlet side before the installation area of the V-Kat 5 extended forward to the front transverse wall 28 and perforated in this area or provided with holes 35. The exhaust gas fed into the muffler 1 flows from the rear chamber 32 via the middle chamber 31 to the front chamber 30 and from there through an opening 36 in the front transverse wall 28 and from the middle chamber 31 via the holes 35 in the AN / SD module 7 and leaves this cleaned after its flow through its in the rear end wall 3 of the muffler 1 gas-tight led out end pipe 11/2. The transverse walls 28, 29 and the internal part of the inlet pipe 13 also serve for soundproofing.

Fig. 7 zeigt eine Ausführungsform des AN-/SD-Moduls 7, bei der dessen Gehäuse-Endabschnitt 11 einen U-förmigen Verlauf hat, mit dem das gereinigte Abgas über das Endrohr 11/2 auf Seiten des Eintritts wieder aus den Schalldämpfer 1 ausleitbar ist. Das Eintrittsrohr 13 durchdringt exzentrisch die vordere Stirnwand 3 und ragt nur geringfügig in den Innenraum des Schalldämpfers 1 hinein. Koaxial zum Eintrittsrohr 13 erstrecken sich die Gehäuse-Abschnitte 8, 9, 10 und 11/1 des AN-/SD-Moduls 7. Zur Halterung dieses AN-/SD-Moduls 7 im Schalldämpfer 1 ist eine mittels Perforation oder Durchbrüchen gasdurchlässig gemachte Querwand 37 vorgesehen. In einen unteren Durchbruch derselben ist dabei der erste Gehäuse-Abschnitt 8 und in einem oberen Durchbruch das Endrohr 11/2 des Gehäuse-Abschnitts 11 gehaltert. Die Querwand 37 unterteilt den Schalldämpfer-Innenraum in eine vordere Kammer 38 und hintere Kammer 39 und dient zusammen mit dem relativ langen Endrohr 11/2 auch zur Schalldämpfung.Fig. 7 shows an embodiment of the AN / SD module 7, in which the housing end portion 11 has a U-shaped course with which the purified exhaust via the tailpipe 11/2 on the side of entry again from the muffler 1 ausleitbar is. The inlet pipe 13 eccentrically penetrates the front end wall 3 and projects only slightly into the interior of the muffler 1. Coaxially to the inlet tube 13, the housing sections 8, 9, 10 and 11/1 of the AN / SD module extend 7. For holding this AN / SD module 7 in the muffler 1 is a gas-permeable by perforation or openings made transverse wall 37 provided. In a lower breakthrough of the same, the first housing portion 8 and in an upper opening the end tube 11/2 of the housing portion 11 is supported. The transverse wall 37 divides the muffler interior into a front chamber 38 and rear chamber 39 and serves together with the relatively long tail pipe 11/2 for soundproofing.

Fig. 8 zeigt den AN-/SD-Modul 7 im Vergleich zum Beispiel gemäß Fig. 1 axial näher zum Eintrittsrohr 13 hingerückt und mit einem längeren Endrohr 11/2 ausgestaltet ist. Außerdem ist der Gehäuse-Endabschnitt 11 mit einer Perforierung bzw. Löchern 14 versehen und auf nahezu ganzer Länge mit einer äußeren Schicht 15 aus Schalldämpfungs- bzw. Absorptionsmaterial beschichtet.Fig. 8 shows the AN / SD module 7 in comparison with the example of FIG. 1 axially closer to the inlet pipe 13 and designed with a longer end pipe 11/2. In addition, the housing end portion 11 is provided with a perforation or holes 14 and coated over almost its entire length with an outer layer 15 of Schalldämpfungs- or absorption material.

Die Ausführungsform gemäß Fig. 9 unterscheidet sich von jener gemäß Fig. 8 dadurch, dass nur das Endrohr 11/2 mit einer Perforation bzw. Löchern 14 versehen und außen mit einer Schicht 15 aus Dämpfungs- bzw. Absorptionsmaterial beschichtet ist.The embodiment according to FIG. 9 differs from that according to FIG. 8 in that only the end tube 11/2 is provided with a perforation or holes 14 and is coated on the outside with a layer 15 of damping or absorption material.

Die Ausführungsform gemäß Fig. 10 unterscheidet sich von jener gemäß Fig. 8 dadurch, dass in das Endrohr 11/2 des Gehäuse-Endabschnitts 11 eine Venturidüse 40 eingebaut ist, die zu einer weiteren Reduzierung des Schallpegels am Austritt beiträgt.The embodiment according to FIG. 10 differs from that according to FIG. 8 in that a Venturi nozzle 40, which contributes to a further reduction of the sound level at the outlet, is installed in the end pipe 11/2 of the housing end section 11.

Die Ausführungsformen gemäß Fig. 11 und 12 unterscheiden sich von den Ausführungsformen der Fig. 1 bis 10 dadurch, dass der Gehäuse-Endabschnitt 11 nicht geradlinig, sondern gekrümmt trichterförmig vom Gehäuse-Abschnitt 10 abgeht, und zwar zunächst zylindrisch und sich dann mit einem Viertel-Bogen zum zylindrischen Endrohr 11/2 hin verjüngend, das hier seitlich durch die Umfangsaußenwand 4 des Schalldämpfers 1 aus diesem herausgeführt ist. Der Gehäuse-Endabschnitt 11 ist im Bereich 11/1 perforiert bzw. mit Löchern 14 versehen und außen mit einem Schalldämpfungs- bzw. Absorptionsmaterial 15 beschichtet. Im Unterschied zur Ausführungsform gemäß Fig. 11 ist bei jener gemäß Fig. 12 der Teil 11/1 des Gehäuse-Endabschnitts 11 aus einzeln hergestellten Doppel-Halbschalen zusammengesetzt, die nach ihrer Zusammenfügung und dem Einsetzen des Endrohres 11/2 als vereinigter Gehäuse-Endabschnitt 11 am Gehäuse-Abschnitt 10 angebaut werden, der hier die Querwand 16 hinten etwas überragt und auf seinem überstehenden Teilbereich den Gehäuse-Endabschnitt 11 aufnimmt.The embodiments according to FIGS. 11 and 12 differ from the embodiments of FIGS. 1 to 10 in that the housing end section 11 is not rectilinear but curved in a funnel shape from the housing section 10, initially cylindrically and then tapered with a quarter-arc to the cylindrical end pipe 11/2, which is led out laterally here by the circumferential outer wall 4 of the muffler 1 from this. The housing end portion 11 is perforated in the region 11/1 or provided with holes 14 and externally coated with a Schalldämpfungs- or absorbent material 15. In contrast to the embodiment according to FIG. 11, in FIG. 12 the part 11/1 of the housing end section 11 is composed of individually produced double half-shells which after their assembly and insertion of the end pipe 11/2 are combined as a united housing end section 11 are mounted on the housing portion 10, which here projects slightly beyond the transverse wall 16 and the housing end portion 11 receives on its protruding portion.

Fig. 13 zeigt eine Ausführungsform, die jener von Fig. 6 ähnlich ist. Der Schalldämpfer 1 hat hier keinen kreisförmigen, sondern etwa rechteckigen Querschnitt. Im unteren Bereich ist das Eintrittsrohr 13 exzentrisch und parallel zur Schalldämpfer-Längsachse LA in den Schalldämpfer-Innenraum hineingeführt und durchdringt dort zwei ihn haltende, durch Perforation oder Löcher gasdurchlässig gemachte Querwände 41, 42. Dieser AN-/SD-Modul 7 ist jenem von Fig. 12 vergleichbar ausgebildet, das Endrohr 11/2 des Gehäuse-Endabschnitts 11 ist hier nicht gerade, sondern abgewinkelt und etwa in Höhe des Eintrittsrohes 13 seitlich durch die Umfangsaußenwand 4 aus dem Schalldämpfer 1 herausgeführt. Eingebaut ist dieser AN-/ SD-Modul 7 in den Schalldämpfer 1 so, dass sich seine Gehäuseteile 8, 9, 10 mit dem eingebauten V-Kat 5 und Abgasnachbehandlungsorgan 6 im oberen Bereich und parallel zur Längsachse LA des Schalldämpfers 1 erstrecken. Gehalten wird dieser AN-/SD-Modul 7 ebenso wie das Eintrittsrohr 13 durch die Querwände 41, 42, die ebenso wie das Eintrittsrohr 13 und der Gehäuse-Endabschnitt 11 auch zur Schalldämpfung dienen. Die Querwände 41, 42 unterteilen den Schalldämpfer-Innenraum in eine vordere Kammer 43, mittlere Kammer 44 und hintere Kammer 45. Das Eintrittsrohr 13 ist hier im Bereich der mittleren (44) und hinteren Kammer 45 perforiert bzw. mit Löchern 46 versehen, so dass Abgas aus dem Eintrittsrohr 13 nicht nur in die hintere Kammer 45, sondern in geringerem Umfang auch seitlich in die mittlere und hintere Kammer 44, 45 eintreten kann. Von dort gelangt das Abgas über die durchlässigen Querwände 41, 42 zurück in die vordere Kammer 43, von wo aus es in den AN-/SD-Modul 7 für dessen Durchströmung eintreten kann.Fig. 13 shows an embodiment similar to that of Fig. 6. The muffler 1 has no circular, but approximately rectangular cross-section. In the lower part of the inlet pipe 13 is guided eccentrically and parallel to the longitudinal axis of the muffler LA in the muffler interior and penetrates there two holding him through perforation or gas-permeable holes made transverse walls 41, 42. This AN / SD module 7 is that of 12, the end tube 11/2 of the housing end portion 11 is not straight, but angled and led out approximately at the level of the inlet tube 13 laterally through the circumferential outer wall 4 of the muffler 1. This AN / SD module 7 is installed in the silencer 1 in such a way that its housing parts 8, 9, 10 with the installed V-type catalytic converter 5 and exhaust aftertreatment device 6 extend in the upper region and parallel to the longitudinal axis LA of the silencer 1. This AN / SD module 7, like the inlet pipe 13, is held by the transverse walls 41, 42, which, like the inlet pipe 13 and the housing end section 11, also serve to dampen noise. The transverse walls 41, 42 divide the muffler interior into a front chamber 43, middle chamber 44 and rear chamber 45. Here, the inlet pipe 13 is perforated in the region of the middle (44) and rear chamber 45 or holes 46, so that Exhaust gas from the inlet pipe 13 can not only enter the rear chamber 45, but to a lesser extent laterally in the middle and rear chambers 44, 45. From there, the exhaust gas passes through the permeable transverse walls 41, 42 back into the front chamber 43, from where it can enter into the AN / SD module 7 for the flow therethrough.

Das Ausführungsbeispiel gemäß Fig. 14 ist jenem von Fig. 8 ähnlich. Der wesentliche Unterschied besteht darin, dass hier der AN-/SD-Modul 7 leicht austauschbar im Schalldämpfer 1 angeordnet und hierfür an einer Endplatte 47 befestigt ist, die das Zentralteil der hier zweiteiligen hinteren Stirnwand 3 des Schalldämpfers 1 bildet. Das äußere ringförmige Teil 48 der Stirnwand 3 ist mit der Umfangsaußenwand 4 durch Falzung vereinigt und die Endplatte 47 mit dem AN-/SD-Modul 7 ist am ringförmigen Teil 48 mittels mehrerer Klemm- oder Schraubverbindungen 49 befestigt. Sofern erforderlich könnte dieser AN-/SD-Modul 7 intern des Schalldämpfers 1 noch durch eine Querwand 16 (wie in Fig. 8) abgestützt sein.The embodiment of FIG. 14 is similar to that of FIG. 8. The main difference is that here the AN / SD module 7 easily replaceable in the muffler. 1 arranged and attached thereto for an end plate 47, which forms the central part of the two-part rear end wall 3 of the muffler 1 here. The outer annular portion 48 of the end wall 3 is joined to the peripheral outer wall 4 by folding and the end plate 47 with the AN / SD module 7 is secured to the annular portion 48 by means of a plurality of clamping or screw 49. If necessary, this AN / SD module 7 could still be internally supported by the muffler 1 by a transverse wall 16 (as in FIG. 8).

Das Ausführungsbeispiel gemäß Fig. 15 und 16 weist zwei AN-/SD-Module 7 der auch in Fig. 9 verwendeten Bauart auf. Diese haben allerdings unterschiedlich lange Endrohre 11/2 an ihren Gehäuse-Endabschnitten 11, damit sie, wie in Fig. 15 dargestellt, axial versetzt zueinander, aber jeweils parallel zur Längsachse LA des Schalldämpfers 1 und sich in Axialprojektion teilweise überdeckend in letzteren einbaubar sind. Eine nicht gasdichte Querwand 50 hält die beiden AN-/SD-Module 7 in Einbaulage, die andere Halterstelle für diese ist durch die hintere Stirnwand 3 des Schalldämpfers 1 gegeben, durch die sie mit ihren Endrohren 11/2 gasdicht herausgeführt sind.The embodiment according to FIGS. 15 and 16 has two AN / SD modules 7 of the type also used in FIG. 9. However, these have differently long tailpipes 11/2 at their housing end portions 11, so that they, as shown in Fig. 15, axially offset from each other, but each parallel to the longitudinal axis LA of the muffler 1 and in Axialprojektion partially overlapping in the latter can be installed. A non-gas-tight transverse wall 50 holds the two AN / SD modules 7 in the installed position, the other holder point for this is given by the rear end wall 3 of the muffler 1, through which they are led out gas-tight with their tailpipes 11/2.

Die Figuren 17 bis 19 zeigen eine Ausführungsform der Erfindung mit einem nach einem zweiten Grundprinzip gestalteten AN-/SD-Modul 7. Dieser den Systemkern im Schalldämpfer 1 bildende AN-/SD-Modul 7 setzt sich aus mehreren - im dargestellten Fall vier - Abgasnachbehandlungsmodulen zusammen, die in einen Gehäuse-Endabschnitt 11' ausmünden. Dabei sind alle Abgasnachbehandlungsmodule vorzugsweise gleich ausgebildet und ausgestaltet und weisen in jeweils einem eigenen Gehäuse eingangs einen V-Kat 5, ausgangs ein Abgasnachbehandlungsorgan 6 eingebaut und dazwischen eine sich zu letzterem hin trichterförmig erweitende Überströmkammer 12' auf. Das Gehäuse dieses AN-/SD-Moduls 7 setzt sich demnach aus den Gehäusen der Abgasnachbehandlungsmodule und dem gemeinsamen Gehäuse-Endabschnitt 11' zusammen. Der erste Gehäuse-Abschnitt wird hier durch die ersten Gehäuse-Abschnitte 8' der Abgasnachbehandlungsmodule gebildet. Der zweite Gehäuse-Abschnitt wird hier durch die zweiten Gehäuse-Abschnitte 9' der Abgasnachbehandlungsmodule gebildet. Der dritte Gehäuse-Abschnitt wird hier durch die dritten Gehäuse-Abschnitte 10' der Abgasnachbehandlungsmodule gebildet. Jeder erste Gehäuse-Abschnitt 8' ist jeweils kreiszylindrisch ausgebildet und schmiegt sich außen an den in ihn eingebauten V-Kat 5 an. An jeden dieser ersten Gehäuse-Abschnitte 8 schließt sich koaxial ein sich trichterförmig erweiternder, eine Überströmkammer 12' begrenzender zweiter Gehäuse-Abschnitt 9' und an diesen wiederum koaxial ein kreiszylindrischer dritter Gehäuse-Abschnitt 10' an. Dabei schmiegt sich jeder erste Gehäuse-Abschnitt 8' außen an den in ihn eingebauten V-Kat 5 an. Außerdem schmiegt sich jeder dritte Gehäuse-Abschnitt 10' außen an das in ihn eingebaute Abgasnachbehandlungsorgan 6 an. Diese vorgefertigten Abgasnachbehandlungsmodule sind mit ihren Gehäusen achsparallel zueinander und zur Längsachse des Schalldämpfers 1 in dessen Innenraum angeordnet und durchdringen dabei jeweils einen Durchbruch in einer Querwand 51, dort außen gasdicht eingepasst. Diese Querwand 51 trennt im Schalldämpfer 1 eine Abgaseinströmkammer 52 von einer weiteren Kammer 53. In die Abgaseinströmkammer 52 gelangt das Abgas über das Eintrittsrohr 13. Jeder der Abgasnachbehandlungsmodule kommuniziert eingangsseitig mit der Abgaseinströmkammer 52 und mündet ausgangsseitig in den Gehäuse-Endabschnitt 51 aus. Letzterer umgibt bei dieser Bauart des AN-/SD-Moduls 7 mit seinem im Wesentlichen rechteckigen Anfangsbereich 11/1' die dritten Gehäuse-Abschnitte 10' der Abgasnachbehandlungsmodule außen peripher und schmiegt sich mit seinen verrundeten Eckbereichen - wie aus Fig. 18 ersichtlich - an Umfangsabschnitte derselben formschlüssig an. Außerdem ist dieser Gehäuse-Endabschnitt 11' stirnseitig gasdicht fest oder über einen gasdichten, aber lösbaren Verbindungsmechanismus an der Querwand 51 befestigt. Hinter den Austrittsbereichen der Abgasnachbehandlungsmodule verjüngt sich der Gehäuse-Endabschnitt 11' mit einem sich an den Anfangsbereich 11/1' anschließenden Mittelbereich 11/2' zu einem kreiszylindrischen Endrohr 11/3' hin, mit dem der Gehäuse-Endabschnitt 11 gasdicht aus dem Schalldämpfer 1 herausgeführt ist.FIGS. 17 to 19 show an embodiment of the invention with an AN / SD module 7 designed according to a second basic principle. This AN / SD module 7 forming the system core in the silencer 1 consists of several - in the case shown four - exhaust aftertreatment modules together, which open into a housing end portion 11 '. In this case, all the exhaust aftertreatment modules are preferably of the same design and configured and have in each case a separate housing at the beginning of a V-Kat 5, built-in exhaust aftertreatment device 6 and in between a funnel-shaped extending to the latter overflow chamber 12 'on. The housing of this AN / SD module 7 is accordingly composed of the housings of the exhaust aftertreatment modules and the common housing end section 11 '. The first housing section is formed here by the first housing sections 8 'of the exhaust aftertreatment modules. The second housing section is formed here by the second housing sections 9 'of the exhaust aftertreatment modules. The third housing section is formed here by the third housing sections 10 'of the exhaust aftertreatment modules. Each first housing portion 8 'is formed in each case circular cylindrical and hugs the outside of the built-in it V-Kat 5 at. Coaxially to each of these first housing sections 8 is a funnel-shaped widening, an overflow chamber 12 'limiting second housing portion 9' and in turn coaxially thereto a circular cylindrical third housing section 10 'on. In this case, each first housing section 8 'hugs the exterior of the V-cat 5 built into it. In addition, every third housing section 10 'hugs the exterior of the exhaust aftertreatment device 6 built into it. These prefabricated exhaust aftertreatment modules are arranged with their housings axially parallel to each other and to the longitudinal axis of the muffler 1 in the interior and penetrate each case an opening in a transverse wall 51, fitted gas-tight out there. In the exhaust gas inflow chamber 52, the exhaust gas passes through the inlet pipe 13. Each of the exhaust aftertreatment modules communicates on the input side with the Abgaseinströmkammer 52 and ends on the output side in the housing end portion 51. The latter surrounds in this type of AN / SD module 7 with its substantially rectangular initial region 11/1 'the third housing sections 10' of the exhaust aftertreatment modules outside peripherally and nestles with its rounded corner areas - as shown in FIG Peripheral sections of the same form fit. In addition, this housing end portion 11 'frontally gas-tight or attached via a gas-tight, but releasable connection mechanism to the transverse wall 51. Behind the exit regions of the exhaust aftertreatment modules, the housing end portion 11 'tapers with a central region 11/2' adjoining the initial region 11/1 'to form a circular-cylindrical end pipe 11/3', with which the housing end portion 11 gas-tight from the muffler 1 is led out.

Die Figuren 20 bis 22 zeigen eine weitere Ausführungsform der Erfindung mit einem nach einem dritten Grundprinzip gestalteten AN-/SD-Modul 7. Dieser den Systemkern im Schalldämpfer 1 bildende AN-/SD-Modul 7 weist ein aus mehreren einzeln vorgefertigten Teilgehäusen 8", 9", 10", 11" zusammengesetztes Gehäuse auf. Dabei ist in den vorzugsweise kreiszylindrischen ersten Gehäuse-Abschnitt 8" ein V-Kat 5 eingebaut. Koaxial an diesen ersten Gehäuse-Abschnitt 8" schließt sich hinter dem V-Kat 5 ein sich trichterartig erweiternder, eine Überströmkammer 12" begrenzender zweiter Gehäuse-Abschnitt 9" an, der endseitig gasdicht an einer Querwand 54 angeschlossen endet. Diese Querwand 54 trennt im Schalldämpfer 1 eine vordere Abgaseinströmkammer 55 von einer hinteren Kammer 56. Des weiteren weist dieser AN-/SD-Modul 7 mehrere Abgasnachbehandlungsmodule auf - im dargestellten Bespiel zwei -, von denen jeder in einem Teilgehäuse 10" ein eingebautes Abgasnachbehandlungsorgan 6 aufnimmt und zusammen mit diesem einen vorfertigbaren Abgasnachbehandlungsmodul bildet. Jeder dieser Abgasnachbehandlungsmodule kommuniziert mit seinem Teilgehäuse 10" über einen koaxialen Durchbruch 57 in der Querwand 54 mit der Überströmkammer 12" und ist mit seinem Teilgehäuse 10" stirnseitig gasdicht an der Querwand 54 angeschlossen. Außerdem ist jeder dieser Abgasnachbehandlungsmodule mit einem äußeren Umfangsabschnitt seines Gehäuses 10" formschlüssig an einen inneren Umfangsbereich des Gehäuse-Endabschnitts 11" angeschmiegt, der mit seinem zylindrischen, im Querschnitt hier ovalen Anfangsbereich 11/1" diese Teilgehäuse 10" der Abgasnachbehandlungsmodule außen peripher umgibt, ferner stirnseitig gasdicht fest oder über einen gasdichten, aber lösbaren Verbindungsmechanismus an der Querwand 54 befestigt ist. Hinter den Austrittsebenen der Abgasnachbehandlungsmodule verjüngt sich der Gehäuse-Endabschnitt 11" mit seinen sich am Anfangsbereich 11/1" anschließenden Mittelbereich 11/2" zu einem Endbereich 11/3" hin, der im dargestellten Beispiel durch ein kreiszylindrisches Endrohr gebildet ist, mit dem der Gehäuse-Endabschnitt 11" gasdicht aus dem Schalldämpfer 1 herausgeführt ist. Die Gehäuse-Abschnitte 8" und 9" bilden mit dem eingangs eingebauten V-Kat 5 ebenfalls einen vorfertigbaren Modul, der dann mit der Querwand 54 vereinigt wird.FIGS. 20 to 22 show a further embodiment of the invention with an AN / SD module 7 designed according to a third basic principle. This AN / SD module 7 forming the system core in the silencer 1 has a plurality of individually prefabricated sub-housings 8 ", 9 ", 10", 11 "composite housing. In this case, a V-type catalytic converter 5 is installed in the preferably circular-cylindrical first housing section 8 ".Coaching to this first housing section 8", behind the V-catalytic converter 5, is a second housing section which widens like a funnel and delimits an overflow chamber 12 " 9 ", the ends gas-tight connected to a transverse wall 54 ends. This transverse wall 54 separates in the muffler 1 a front Abgaseinströmkammer 55 from a rear chamber 56. Furthermore, this AN / SD module 7 has a plurality of exhaust aftertreatment modules - in the illustrated example two - each of which in a sub-housing 10 "a built-exhaust aftertreatment 6th Each of these exhaust aftertreatment modules communicates with its sub-housing 10 "via a coaxial aperture 57 in the transverse wall 54 with the overflow chamber 12" and is connected with its partial housing 10 "gas-tight on the transverse wall 54. In addition, each of these exhaust aftertreatment modules with an outer peripheral portion of its housing 10" form fit to a inner circumferential region of the housing end portion 11 "nestled, the outer circumferential surrounds this sub-housing 10" of the exhaust aftertreatment modules with its cylindrical, oval here in cross-section here, also gas-tight front side gas-tight or via a gas-tight, but releasable connection mechanism on the transverse wall 54th Behind the exit planes of the exhaust gas aftertreatment modules, the housing end section 11 "tapers, with its central region 11/2" adjoining the starting region 11/1 "toward an end region 11/3", which in the example shown is formed by a circular-cylindrical end tube with which the Housing end portion 11 "is led out of the muffler 1 gas-tight. The housing sections 8 "and 9" form with the initially installed V-Kat 5 also a prefabricated module, which is then combined with the transverse wall 54.

Bei den Ausführungsformen gemäß Fig. 17 bis 19 und 20 bis 22 ist der jeweilige Gehäuse-Endabschnitt 11' bzw. 11" im Bereich seines Anfangs- und Mittelteils 11/1', 11/1" sowie 11/2', 11/2" vorzugsweise in doppellagiger Halbschalenbauweise realisiert, d. h. jeweils eine vorgefertigte innere und äußere obere Halbschale wird mit einer inneren und äußeren unteren Halbschale vereinigt, in welches dann doppelwandige Teil das Endrohr 11/3' bzw. 11/3" gasdicht eingebaut wird. Hierdurch ergibt sich in Einbaulage des AN-/SD-Moduls 7 ein Gehäuse-Endabschnitt 11' bzw. 11" mit integrierter Schallabsorbtion.In the embodiments according to FIGS. 17 to 19 and 20 to 22, the respective housing end section 11 'or 11 "is in the region of its start and middle part 11/1', 11/1" and 11/2 ', 11/2 "preferably realized in a two-ply half-shell construction, ie in each case a prefabricated inner and outer upper half-shell is combined with an inner and outer lower half-shell, in which then double-walled part of the tailpipe 11/3 'and 11/3" is installed gas-tight. This results in the installed position of the AN / SD module 7, a housing end portion 11 'or 11 "with integrated Schallabsorbtion.

Claims (11)

  1. Combined exhaust-gas aftertreatment/sound attenuation device in the exhaust-system branch of an internal combustion engine, particularly a diesel engine of a commercial vehicle such as a truck or bus/coach, with a silencer (1) which is spatially limited by a front end wall (2) and rear end wall (3) and by a peripheral outer wall (4) and in whose interior are installed at least one pre-oxidising catalytic converter (5)significantly increasing the NO2 content in the flow of exhaust gases and at least one exhaust-gas aftertreatment device, whereby the exhaust gases to be aftertreated can be conducted via an inlet pipe (13) into the silencer (1) and after passage through the pre-oxidising catalytic converter (5) and exhaust-gas aftertreatment device can again be conducted out of said silencer, the exhaust gases then being clean and indirectly sound attenuated, whereby
    • at least one - hereinafter referred to as AN/SD module - exhaust-gas aftertreatment/sound-attenuation module (7) as core of the system is installed in the silencer (1),
    • the AN/SD module (7) is provided with an AN/SD module housing composed of several parts,
    • at least one pre-oxidising catalytic converter (5) is installed in a first section (8,8', 8") of the AN/SD module housing, characterised in that
    • the first section (8, 8', 8") of the AN/SD module housing is followed by a second section (9, 9', 9") of the AN/SD module housing, which second section expands in a funnel-type manner and limits an overflow chamber (12, 12', 12"),
    • the second section (9, 9', 9") is followed by a third section (10, 10', 10") of the AN/SD module housing, in which at least one exhaust-gas aftertreatment organ (6) - a particulate filter or a catalytic particulate separator or a catalytic converter - is installed,
    • the third section (10, 10', 10") of the AN/SD module housing is followed by a fourth section (11, 11', 11") of the AN/SD module housing, which fourth section (11, 11', 11") collects the cleaned exhaust gases and conducts the sound-attenuated exhaust gases out of the silencer (1), and
    • all housing parts of the AN/SD module (7) are manufactured from sulphuric-acid-resistant ferritic or austenitic special steel, whereas all exterior walls (2, 3, 4), the inlet pipe (13) and every inner organ of the silencer (1) such as the transverse or support wall are made of non-alloyed sheet steel aluminised or otherwise coated for anti-corrosion purposes, said inner organ being located outside the AN/SD module (7).
  2. Combined exhaust-gas aftertreatment/sound-attenuation device according to Claim 1, characterised in that the AN/SD module (7) constituting the system core in the silencer (1) is provided with an AN/SD module housing composed of two singly prefabricated parts, whereby either the two first (8, 9) or the three first sections (8, 9, 10) of the AN/SD module housing form the first part and the third (10) and fourth (11) sections or only the fourth section (11) of the AN/SD module housing form(s) the second part which follows the first part and is either rigidly or detachably connected with said first part via a connecting mechanism.
  3. Combined exhaust-gas aftertreatment/sound-attenuation device according to Claim 2, characterised in that the first section (8) of the AN/SD module housing is circular-cylindrical and snugly fits against the outside of the installed pre-oxidising catalytic converter (5), that the second section of the AN/SD module housing limits the overflow chamber (12) and coaxially follows the first section (8) of the AN/SD module housing as a funnel-type extension and the third section (10) of the AN/SD module housing is circular-cylindrical and coaxially follows said second section and snugly fits against the outside of the exhaust-gas aftertreatment organ (6) installed in it and that with its initial section (11/1) the fourth section (11) of the AN/SD module housing forms an exhaust-gas/silencer end pipe, coaxially extends with identical diameter from the diameter of the third section (10) of the AN/SD module housing and tapers in a funnel-type manner and ends in a circular-cylindrical end section (11/2) with which it is led out of the silencer (1) in a gas-tight manner.
  4. Combined exhaust-gas aftertreatment/sound-attenuation device according to Claim 1, characterised in that the AN/SD module (7) constituting the system core in the silencer (1) is composed of several exhaust-gas aftertreatment modules ending in a common fourth section (11') of the AN/SD module housing.
  5. Combined exhaust-gas aftertreatment/sound-attenuation device according to Claim 4, characterised in that the exhaust-gas aftertreatment modules of this AN/SD module (7) are all of identical shape and design and, in each AN/SD module housing, are provided with a pre-oxidising catalytic converter (5) at the inlet and with an exhaust-gas aftertreatment organ (6) at the outlet and that an overflow chamber (12') is provided in between and expands towards said organ (6) in a funnel-type manner.
  6. Combined exhaust-gas aftertreatment/sound-attenuation device according to one of the Claims 4 and 5, characterised in that the housings of the exhaust-gas aftertreatment modules of this AN/SD module (7) are arranged axis-paraliel relative to each other and to the longitudinal axis (LA) of the silencer (1) in the interior of said silencer (1) and pass through openings in a transverse wall (51) on whose outside they are inserted in a gas-tight manner and which separates an exhaust-gas inlet chamber (52) from another chamber (53) in the silencer (1) and that, on the inlet side, each of these exhaust-gas aftertreatment modules communicates with the exhaust-gas inlet chamber (52) and, on the outlet side, discharges into the fourth section (11') of the AN/SD module housing.
  7. Combined exhaust-gas aftertreatment/sound-attenuation device according to one of the Claims 4 to 6, characterised in that the housing of this AN/SD module (7) is composed of the housings for the exhaust-gas aftertreatment modules and the fourth section (11') of the AN/SD module housing, whereby the first section of the AN/SD module housing is formed here by the first housing sections (8') of the exhaust-gas aftertreatment modules, whereby, in addition, the second section of the AN/SD module housing is formed by housing sections (9') of the exhaust-gas aftertreatment modules, which housing sections (9') expand in a funnel-type manner, and whereby the third section of the AN/SD module housing is formed by third housing sections (10') of the exhaust-gas aftertreatment modules, whereby, in addition, each first housing section (8') is of circular-cylindrical design and snugly fits against the outside of the pre-oxidising catalytic converter (5) installed in it, whereby, in addition, each first housing section (8') is coaxially followed by each second housing section (9') expanding in a funnel-type manner, limiting an overflow chamber (12') and in turn coaxially followed by the respective circular-cylindrical third housing section (10') snugly fitting against the outside of the exhaust-gas aftertreatment organ (6) installed in it.
  8. Combined exhaust-gas aftertreatment/sound-attenuation device according to Claim 7, characterised in that with its initial area (11/1') the fourth section (11') of the AN/SD module housing snugly fits against the outer periphery and against circumferential sections of the exhaust-gas aftertreatment modules and positively encompasses said sections, is also fastened to the front side of the transverse wall (51) in a firm and gas-tight manner or via a gas-tight, but detachable connecting mechanism and, with its centre area (11/2') behind the discharge planes of the exhaust-gas aftertreatment modules, tapers in a funnel-type manner towards an end area (11/3') preferably formed by a circular-cylindrical end pipe with which the fourth section (11') of the AN/SD module housing is conducted out of the silencer (1) in a gas-tight manner.
  9. Combined exhaust-gas aftertreatment/sound-attenuation device according to Claim 1, characterised in that the AN/SD module (7) constituting the system core in the silencer (1) is provided with an AN/SD module housing composed of several singly prefabricated part housings (8", 9", 10", 11"), that a pre-oxidising catalytic converter (5) is installed in the preferably circular-cylindrical first section (8") of the AN/SD module housing, that this first section (8") of the AN/SD module housing is coaxially followed by a second section (9") of the AN/SD module housing, which second section (9") expands in a funnel-type manner, limits the overflow chamber (12") and is, with its end face, connected to a transverse wall (54) in a gas-tight manner, which transverse wall (54) separates an exhaust-gas inlet chamber (55) from another chamber (56) within the silencer (1), that, in addition, this AN/SD module (7) has several exhaust-gas aftertreatment modules, each of which integrates in a part housing (10") an exhaust-gas aftertreatment organ (6) installed therein, that, in addition, the part housing (10") of each exhaust-gas aftertreatment module communicates with the overflow chamber (12") via a separate passage orfice (57) in the transverse wall (54), is connected to the front face of the transverse wall (54) in a gas-tight manner and, with an outer circumferential section, snugly fits positively against an inner circumferential area of the fourth section (11") of the AN/SD module housing and that with its initial area (11/1") this fourth section (11") of the AN/SD module housing peripherally encompasses the part housings (10") of the exhaust-gas aftertreatment modules on the outside, is, in addition, connected to front face of the transverse wall (54) in a gas-tight manner or via a gas-tight, but detachable connecting mechanism and, with its centre area (11/2") tapers behind the discharge planes of the exhaust-gas aftertreatment modules in a funnel-type manner towards an end area (11/3") preferably formed by a circular-cylindrical end pipe with which the fourth section (11') of the AN/SD module housing is conducted out of the silencer (1) in a gas-tight manner.
  10. Combined exhaust-gas aftertreatment/sound-attenuation device according to one of the foregoing Claims, characterised in that for sound-attenuation purposes the fourth section (11, 11', 11") of the AN/SD module housing is wholly or partially perforated or provided with single holes and/or is coated with sound-attenuation material on the outside over its entire length or over only a partial length.
  11. Combined exhaust-gas aftertreatment/sound-attenuation device according to one of the foregoing Claims 2 and 3, characterised in that the AN/SD module housing (7) is fixed in position via at least one gas-tight or gas-permeable transverse wall or bracket in the silencer interior.
EP04007937A 2003-04-11 2004-04-01 Combined exhaust gas treatment/silencer device in an exhaust line of an internal combustion engine Expired - Lifetime EP1467070B1 (en)

Applications Claiming Priority (2)

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DE10316799 2003-04-11
DE10316799A DE10316799A1 (en) 2003-04-11 2003-04-11 Combined exhaust gas aftertreatment / noise reduction device in the exhaust line of an internal combustion engine

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EP1467070A1 EP1467070A1 (en) 2004-10-13
EP1467070B1 true EP1467070B1 (en) 2006-03-08

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US20040202591A1 (en) 2004-10-14
EP1467070A1 (en) 2004-10-13
DE502004000334D1 (en) 2006-05-04
DE10316799A1 (en) 2004-10-28
ATE319921T1 (en) 2006-03-15
US7273592B2 (en) 2007-09-25

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