DE4228384A1 - Automotive catalytic converter, preventing emission of pulse-generated noises - has heat conducting circumferential corrugated inner sleeve at outlet of mantle rim - Google Patents

Automotive catalytic converter, preventing emission of pulse-generated noises - has heat conducting circumferential corrugated inner sleeve at outlet of mantle rim

Info

Publication number
DE4228384A1
DE4228384A1 DE4228384A DE4228384A DE4228384A1 DE 4228384 A1 DE4228384 A1 DE 4228384A1 DE 4228384 A DE4228384 A DE 4228384A DE 4228384 A DE4228384 A DE 4228384A DE 4228384 A1 DE4228384 A1 DE 4228384A1
Authority
DE
Germany
Prior art keywords
mantle
exhaust gas
housing
catalytic converter
outlet
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.)
Withdrawn
Application number
DE4228384A
Other languages
German (de)
Inventor
Wilhelm Dipl Ing Kuhn
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to DE4228384A priority Critical patent/DE4228384A1/en
Publication of DE4228384A1 publication Critical patent/DE4228384A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2046—Periodically cooling catalytic reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • 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
    • F01N13/14—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 thermal insulation
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

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

Abstract

An automotive catalytic converter encloses the structure within a mantle which is gas-tight at the inlet end and forms a gap with the outlet structure at low exhaust temperatures. The novelty is that the housing in the vicinity of the outlet mantle rim, has a circumferential corrugated inner sleeve made of heat conducting material which opens the gap above a predetermined temp. by transferring heat to the mantle or catalyst. A suitable catalytic converter has a housing (1) in the vicinity of the outlet mantle (5) rim (7). A circumferential corrugated (13) sleeve (12) made of heat conducting material opens the gap (10) above a pre-determined temperature by transferring heat to the mantle (5) or catalyst (4). ADVANTAGE - Prevents the emission of pulse noise at the normal catalytic converter operating temperatures.

Description

Die Erfindung betrifft eine Katalysatoranordnung gemäß dem Ober­ begriff des Patentanspruchs 1. Eine Katalysatoranordnung dieses Aufbaus, wie sie bevorzugt für die Reinigung der Abgase der Brennkraftmaschine eines Kraftfahrzeugs Einsatz finden soll, ist aus der DE-OS 40 26 521, F01N 3/28, bekannt. Der den Katalysator aufnehmende und haltende Mantel ist an seinem abgasaustrittssei­ tigen Ende mit dem Katalysatorgehäuse dicht verbunden, während seine übrigen Umfangsbereiche mit diesem Gehäuse einen in Rich­ tung auf die Abgaseinströmung offenen hohlzylinderartigen Spalt bilden. Eine derartige Konstruktion ist insofern vorteilhaft, als sie nach dem Starten der Brennkraftmaschine infolge der allseiti­ gen Umströmung des Mantels mit Abgas eine schnelle Aufheizung des Mantels und damit auch des Katalysators auf seine Arbeitstempera­ tur sicherstellt.The invention relates to a catalyst arrangement according to the Ober Concept of claim 1. A catalyst arrangement of this Construction, as preferred for the purification of the exhaust gases Internal combustion engine of a motor vehicle is to be used from DE-OS 40 26 521, F01N 3/28, known. The catalyst receiving and holding jacket is on its exhaust outlet end tightly connected to the catalyst housing, while its other circumferential areas with this housing one in rich device on the exhaust gas inflow open hollow cylinder-like gap form. Such a construction is advantageous in that them after starting the engine as a result of allseiti against the flow of exhaust gas around the jacket, rapid heating of the Jacket and thus also the catalyst to its working temperature ensures.

Wie sich gezeigt hat, können jedoch bei einer derartigen Kataly­ satoranordnung bei einem pulsierenden Abgasstrom Schwingungsanre­ gungen erfolgen. Die Pulsation des Abgasstromes läßt sich nicht unterdrücken, da sie auf dem Arbeitszyklus der Brennkraftmaschine beruht. Überhaupt können die sich bei einer derartigen Konstruk­ tion einstellenden Abgasströmungsverhältnisse im Gehäuse zu einer störenden Geräuschentwicklung Anlaß geben.As has been shown, however, such a Kataly sator arrangement with a pulsating exhaust gas flow conditions. The pulsation of the exhaust gas flow cannot be suppress because they are on the duty cycle of the internal combustion engine is based. In general, such a construct tion-adjusting exhaust gas flow conditions in the housing to a give rise to disturbing noise.

Der Erfindung liegt demgemäß die Aufgabe zugrunde, eine gattungs­ gemäße Katalysatoranordnung zu schaffen, bei der unter Wahrung ih­ rer grundlegenden Vorteile eine derartige Geräuschentwicklung zu­ mindest im normalen Betrieb der Maschine, d. h. bei oberhalb der Betriebstemperatur des Katalysatoren liegenden Abgastemperaturen, vermieden ist.The invention is therefore based on the task, a genus to create appropriate catalytic converter arrangement, with respect to ih rer basic advantages to such noise at least during normal machine operation, d. H. at above the Exhaust gas operating temperature of the catalytic converter, is avoided.

Die erfindungsgemäße Lösung dieser Aufgabe besteht in den kenn­ zeichnenden Merkmalen des Patentanspruchs 1, vorteilhafte Ausfüh­ rungen der Erfindung beschreiben die Unteransprüche.The inventive solution to this problem consists in the drawing features of claim 1, advantageous Ausfüh The invention describes the subclaims.

Zwar ist an sich aus der DE-OS 35 12 580, F01N 3/28, die Verwen­ dung einer gewellten Manschette an einem Rand des Mantels zum gasdichten Abschluß des Spalts zwischen Mantelumfang und Gehäuse bekannt, jedoch ist diese Manschette dauernd sowohl mit dem Ge­ häuse als auch mit dem Rand des Mantels dicht verbunden, so daß der definierte Spalt bei niedrigen Abgastemperaturen nicht zur Aufheizung des Mantels und des Katalysators herangezogen wird. In Abweichung von diesem Stand der Technik ist bei der Erfindung die Manschette so ausgebildet, daß sie bei niedrigen Abgastemperatu­ ren die Verbindung des definierten Spalts mit dem von der Abgas­ strömung erfüllten Raum im Gehäuse sicherstellt und bei höheren Abgastemperaturen diese Verbindung unterbricht. Zusätzlich soll die Manschette so ausgelegt sein, d. h. insbesondere ihr Werk­ stoff so gewählt sein, daß sie bei höheren Abgastemperaturen eine gut wärmeleitende Verbindung zwischen Mantel bzw. Katalysator einerseits und Gehäuse andererseits schafft, so daß dann durch die Manschette eine zusätzliche Kühlung des Katalysators und da­ mit ein Schutz gegen gefährliche Überhitzung desselben gewonnen wird.It is in itself from DE-OS 35 12 580, F01N 3/28, the Verwen of a corrugated cuff on one edge of the jacket gastight closure of the gap between the circumference of the casing and the housing known, however, this cuff is constantly with both the Ge housing as well as tightly connected to the edge of the jacket, so that the defined gap at low exhaust gas temperatures is not used Heating of the jacket and the catalyst is used. In Deviation from this prior art is in the invention Cuff designed so that it at low exhaust temperature ren the connection of the defined gap with that of the exhaust gas ensures flow-filled space in the housing and at higher Exhaust temperatures this connection interrupts. In addition, should the cuff should be designed d. H. especially her work Substance should be chosen so that it has a at higher exhaust gas temperatures good heat-conducting connection between jacket or catalyst on the one hand and housing on the other creates, so that then the cuff an additional cooling of the catalyst and there with protection against dangerous overheating of the same becomes.

Ausführungsbeispiele der Erfindung werden im folgenden anhand der Zeichnung erläutert, deren Figuren Axialschnitte teils durch die gesamte Katalysatoranordnung, teils durch hier interessierende Längsschnittbereiche derselben wiedergeben. Embodiments of the invention are described below with reference to the Drawing explained, the figures axial sections partly through the Entire catalyst arrangement, partly by those of interest here Play longitudinal sections of the same.  

Betrachtet man zunächst Fig. 1, so ist mit 1 das einen üblichen Aufbau besitzende Gehäuse mit dem Abgaseintrittstrichter 2 und dem Abgasauslaß 3 bezeichnet. Der Katalysator 4, üblicherweise bestehend aus einer Trägermatrix und auf dieser angeordnetem ka­ talytisch aktiven Material, ist umgeben von dem aus Metall beste­ henden Mantel 5, der an seinem abgasaustrittsseitigen Rand bei 6 dicht mit dem Gehäuse 1 verbunden, bevorzugt verschweißt, ist, während sein abgaseintrittsseitiger Rand 7 in einem axialen Ab­ stand zu der Einziehung 8 des Gehäuses 1 liegt. In Fig. 1 sind in der oberen und unteren Hälfte unterschiedliche Ausführungsbei­ spiele für den Fall relativ niedriger Abgastemperaturen, d. h. nach dem Start der Maschine, wiedergegeben. Betrachtet man zu­ nächst die obere Hälfte der Fig. 1, so ist der hohlzylinderartige Spalt 9 zwischen dem Umfang des Mantels 5 und dem inneren Umfang des mittleren Teils des Gehäuses 1 durch den Zwischenraum 10 strömungsmäßig verbunden mit dem von der Abgasströmung 11 durch­ setzten Raum des Gehäuses 1. Das bedeutet, daß Abgas mit zuneh­ mend höherer Temperatur durch diese Strömungsverbindung 10 in den Spalt 9 eindringen und den Mantel 5 von außen erwärmen kann.Looking first at FIG. 1, 1 denotes the housing, which has a conventional structure, with the exhaust gas inlet funnel 2 and the exhaust gas outlet 3 . The catalyst 4 , usually consisting of a carrier matrix and arranged on it catalytically active material, is surrounded by the existing metal jacket 5 , which is tightly connected, preferably welded, to the housing 1 at its exhaust outlet-side edge at 6 while its Exhaust gas inlet side edge 7 was in an axial position from the retraction 8 of the housing 1 . In Fig. 1 in the upper and lower half different Ausführungsbei play in the case of relatively low exhaust gas temperatures, that is, after the start of the machine, shown. Looking first at the upper half of FIG. 1, the hollow cylindrical gap 9 between the circumference of the casing 5 and the inner circumference of the central part of the housing 1 is connected in terms of flow through the intermediate space 10 to the space through which the exhaust gas flow 11 passes Housing 1 . This means that exhaust gas with increasing temperature can penetrate through this flow connection 10 into the gap 9 and heat the jacket 5 from the outside.

Bei höheren Abgastemperaturen dagegen legt sich die mit in Um­ fangsrichtung verlaufenden Wellen versehene Metallmanschette 12 mit einer ihrer Wellen gegen den Rand 7 des Mantels 5, so daß die Strömungsverbindung 10 unterbrochen wird.At higher exhaust gas temperatures, on the other hand, the metal sleeve 12 provided with shafts running in the circumferential direction lies with one of its shafts against the edge 7 of the jacket 5 , so that the flow connection 10 is interrupted.

Die Fig. 2 und 3 zeigen nochmals die Verhältnisse im Bereich des Randes 7 des Mantels 5 bei niedrigen bzw. hohen Abgastemperatu­ ren: Die nach außen gerichtete Welle 13 der Manschette 12 befin­ det sich bei niedrigen Temperaturen in einem Abstand a von dem strömungseintrittsseitigen Rand 7 des Mantels 5, so daß die Strö­ mungsverbindung 10 zu dem Spalt 9 (siehe Fig. 1) existent ist. Mit zunehmender Abgastemperatur dehnen sich dagegen die Man­ schette 12 und der Mantel 5 in axialer Richtung unter Überwindung des Abstands a aus, bis die Manschette 12 schließlich gemäß Fig. 3 mit ihrer Welle 13 auf dem Rand 7 des Mantels 5 aufliegt und demgemäß die definierte Verbindung 10 unterbricht. Damit ver­ bunden ist die Herstellung einer wärmeleitenden Verbindung von dem Mantel 5 zum Gehäuse 1, das seinerseits in Wärmeaustausch mit der Umgebung steht. Figs. 2 and 3 again show the relationships in the region of the edge 7 of the casing 5 ren at low or high Abgastemperatu: the outward shaft 13 of the cuff 12 befin det at low temperatures at a distance a from the flow inlet-side edge 7 of the jacket 5 , so that the flow connection 10 to the gap 9 (see FIG. 1) exists. In contrast, with increasing exhaust gas temperature, the cuff 12 and the jacket 5 expand in the axial direction, overcoming the distance a, until the cuff 12 finally rests with its shaft 13 according to FIG. 3 on the edge 7 of the jacket 5 and accordingly the defined connection 10 interrupts. This is related to the production of a heat-conducting connection from the jacket 5 to the housing 1 , which in turn is in heat exchange with the environment.

In dem in der unteren Hälfte der Fig. 1 dargestellten Ausfüh­ rungsbeispiel umgibt die Manschette 12 mit einem ihr axiales Gleiten ermöglichenden Spiel das Rohr 14, das sie gegen Abgaspul­ sationen und zu hohe Abgastemperaturen schützt.In the example shown in the lower half of FIG. 1, the sleeve 12 surrounds the tube 14 with a play which enables it to slide axially, which protects it against exhaust gas and excessively high exhaust gas temperatures.

Gemeinsam ist beiden Ausführungsbeispielen wieder die Tatsache, daß im Bereich des Randes 7 der Mantel 5 axial etwas über die zu­ gekehrte Stirnseite 15 des Katalysators 4 übersteht. Dieser axi­ ale Überstand nimmt zumindest bei höheren Katalysatortemperaturen den benachbarten Endbereich der Manschette 12 auf.Common to both exemplary embodiments is the fact that in the region of the edge 7 the jacket 5 protrudes axially somewhat beyond the end face 15 of the catalytic converter 4 which is turned toward it. This axial supernatant takes up the adjacent end region of the sleeve 12 at least at higher catalyst temperatures.

Mit der Erfindung ist demgemäß mit einfachen Mitteln eine gat­ tungsgemäße Katalysatoranordnung geschaffen, die einerseits den Vorteil einer schnellen Aufheizung des eigentlichen Katalysators auf seine Betriebstemperatur besitzt, andererseits aber hinsicht­ lich minimaler Geräuschentwicklung und Kühlung bei Vollastbetrieb optimiert ist.With the invention is accordingly a gat with simple means In accordance with the catalyst arrangement created, the one hand The advantage of rapid heating of the actual catalyst on its operating temperature, but on the other hand minimal noise and cooling at full load is optimized.

Claims (3)

1. Katalysatoranordnung, insbesondere für die Abgasreinigung ei­ ner Kraftfahrzeug-Brennkraftmaschine, mit einem Katalysator in einem Mantel, der nur in einem von seinem strömungsein­ trittsseitigen Rand entfernten Umfangsbereich gasdicht mit ei­ nem Zu- und Abführung aufweisenden, ihn aufnehmenden Gehäuse verbunden ist, während seine anderen Umfangsbereiche mit dem Gehäuse einen Spalt bilden, der an dem Rand des Mantels bei niedrigen Abgastemperaturen mit dem von der Abgasströmung er­ füllten Raum im Gehäuse in Verbindung steht, dadurch gekenn­ zeichnet, daß im Gehäuse (1) im Bereich dieses Randes (7) des Mantels (5) eine in Umfangsrichtung verlaufende Wellen (13) aufweisende Manschette (12) aus wärmeleitendem Material sol­ cher Auslegung wärmeleitend befestigt ist, daß sie oberhalb einer vorgegebenen Abgastemperatur die Verbindung (10) durch wärmeleitende Abstützung an Mantel (5) und/oder Katalysator (4) unterbricht.1.Catalyst arrangement, in particular for the exhaust gas purification of a motor vehicle internal combustion engine, with a catalytic converter in a jacket which is connected in a gas-tight manner only in a circumferential region which is distant from its inlet side on the flow side and has an inlet and outlet, receiving housing, while its other circumferential areas with the housing form a gap, which is at the edge of the jacket at low exhaust gas temperatures with the space filled by the exhaust gas flow in the housing, characterized in that in the housing ( 1 ) in the region of this edge ( 7 ) of Sheath ( 5 ) has a circumferential shaft ( 13 ) having sleeve ( 12 ) made of heat-conducting material such a design that it is heat-conductive so that the connection ( 10 ) above a predetermined exhaust gas temperature by heat-conducting support on the jacket ( 5 ) and / or catalyst ( 4 ) interrupts. 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß ein sich an den Rand (7) anschließender Bereich des Mantels (5) über den Katalysator (4) axial übersteht und die Manschette (12) oberhalb der vorgegebenen Abgastemperatur in diesen Be­ reich eintaucht.2. Arrangement according to claim 1, characterized in that an adjoining the edge ( 7 ) of the jacket ( 5 ) over the catalyst ( 4 ) axially protrudes and the cuff ( 12 ) immerses richly above the predetermined exhaust gas temperature in this loading. 3. Anordnung nach Anspruch 1 oder 2, gekennzeichnet durch ein Schutzrohr (14) innerhalb der Manschette (12).3. Arrangement according to claim 1 or 2, characterized by a protective tube ( 14 ) within the sleeve ( 12 ).
DE4228384A 1991-09-04 1992-08-26 Automotive catalytic converter, preventing emission of pulse-generated noises - has heat conducting circumferential corrugated inner sleeve at outlet of mantle rim Withdrawn DE4228384A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4228384A DE4228384A1 (en) 1991-09-04 1992-08-26 Automotive catalytic converter, preventing emission of pulse-generated noises - has heat conducting circumferential corrugated inner sleeve at outlet of mantle rim

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129375 1991-09-04
DE4228384A DE4228384A1 (en) 1991-09-04 1992-08-26 Automotive catalytic converter, preventing emission of pulse-generated noises - has heat conducting circumferential corrugated inner sleeve at outlet of mantle rim

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DE4228384A1 true DE4228384A1 (en) 1993-03-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667445A1 (en) * 1994-02-14 1995-08-16 Ford Motor Company Limited Spark ignition engine exhaust system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667445A1 (en) * 1994-02-14 1995-08-16 Ford Motor Company Limited Spark ignition engine exhaust system

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