WO1998007967A1 - Exhaust fume system for an internal combustion engine - Google Patents

Exhaust fume system for an internal combustion engine Download PDF

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Publication number
WO1998007967A1
WO1998007967A1 PCT/EP1997/004479 EP9704479W WO9807967A1 WO 1998007967 A1 WO1998007967 A1 WO 1998007967A1 EP 9704479 W EP9704479 W EP 9704479W WO 9807967 A1 WO9807967 A1 WO 9807967A1
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WO
WIPO (PCT)
Prior art keywords
housing
exhaust system
section
guide device
exhaust
Prior art date
Application number
PCT/EP1997/004479
Other languages
German (de)
French (fr)
Inventor
Jürgen Schorn
Manfred Hein
Original Assignee
Dr. Ing. H.C.F. Porsche Aktiengesellschaft
Heinrich Gillet Gmbh & Co. Kg
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 Dr. Ing. H.C.F. Porsche Aktiengesellschaft, Heinrich Gillet Gmbh & Co. Kg filed Critical Dr. Ing. H.C.F. Porsche Aktiengesellschaft
Publication of WO1998007967A1 publication Critical patent/WO1998007967A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N2470/06—Tubes being formed by assembly of stamped or otherwise deformed sheet-metal

Definitions

  • the invention relates to an exhaust system of an internal combustion engine according to the preamble of the main claim.
  • an exhaust system of an internal combustion engine with an oval-cylindrical catalytic converter housing, a cylindrical exhaust pipe and an inflow funnel arranged between them is known, in which the inflow funnel is provided with guide devices for influencing the exhaust gas flow.
  • These guide devices are intended to achieve a uniformity in the flow through the catalyst, the guide device being arranged in such a way that the exhaust gas is applied uniformly to the catalyst support over its entire oval end face.
  • two opposite guide devices in the form of impressions of the housing are arranged so that they are located on the two less curved side surfaces and, through their V-shaped design, redirect the exhaust gases into the outer regions to the more curved side surfaces.
  • Such an inlet connection is suitable for exhaust systems in which the axes of the inlet-side exhaust pipe and the catalyst carrier or the catalyst housing are aligned with one another or run parallel to one another. If the exhaust system is designed in such a way that the axes of the exhaust pipe and the catalyst carrier are not aligned or run parallel to one another due to the cramped installation space, it is no longer possible to apply the catalyst housing evenly with such an inlet connection. However, in order to achieve a uniform loading, the section of the exhaust pipe that merged into the inlet connection had to be bent very sharply in order to form a parallel or aligned axial direction again. Such a curvature of the exhaust pipe would, however, lead to an undesired increase in the exhaust gas back pressure.
  • a guide device is arranged in the inflow nozzle so that it is related to the flow pattern at its longer outer section, a targeted detachment of the flow from the outer wall reached. This leads to an equalization of the inflow of the catalyst carrier and in particular ensures an increased inflow of air to the section of the catalytic converter housing located internally (based on the angle between the two axes).
  • Such a guide device can be produced particularly simply and inexpensively if it is designed as a pressed-in section of the housing of the inflow funnel.
  • the guiding device can be molded from a manufacturing point of view already during the shaping of the housing of the inflow connection piece, so that additional manufacturing steps are not necessary.
  • a particularly uniform flow against the catalyst housing or the catalyst carrier is achieved if the guide device is provided with a tear-off edge on the inflow nozzle. By means of this tear-off edge, a targeted deflection of the exhaust gas flow and an equalization over the surface to be flown are achieved.
  • a particularly good detachment of the exhaust gas flow from the area of the outer wall is achieved if the guide device has an inflow section which is bent outward in the flow direction and which is followed by the tear-off edge. This design improves the detachment of the wall flow again.
  • a particularly simple to manufacture and inexpensive construction of the exhaust system results when the inflow funnel is composed of at least two shell-like housing parts, the guide device advantageously being completely formed in one of the shell-like housing parts.
  • Fig. 2 is a view of the inlet port in the direction II of FIG. 1 and
  • FIG. 3 is a view of a half-shell of the inlet connector in the direction III of FIG. 1st
  • the exhaust system of an internal combustion engine which is partially shown in FIGS. 1 to 3, has a catalytic converter housing 1 which in this exemplary embodiment is circular-cylindrical and in which a catalytic converter support (not shown in detail) is arranged.
  • This catalytic converter housing 1 is connected via an inlet connection 2 arranged at the end to an inlet-side exhaust pipe 3, which is connected to the combustion chambers of the internal combustion engine, also not shown, via an exhaust pipe elbow (not shown).
  • the exhaust pipe 3 is oval-cylindrical.
  • the main axis 4 of the exhaust pipe extends in the inlet area into the inlet connection 2 at an angle ⁇ of approximately 115 ° to the longitudinal axis 5 of the catalyst housing 1.
  • the inflow neck 2 consists of two half-shells 6, 7.
  • the half-shell 6 has a short, cylindrically shaped connecting piece 8 which is connected to the catalyst housing 1 in the region of the end face 9 thereof.
  • the half-shell 6 On the side facing away from the catalytic converter housing 1, the half-shell 6 has a fastening edge 10 which is angled outward in the manner of a collar and against which a corresponding fastening edge 11 of the half-shell 7 which is angled in the manner of a collar bears.
  • the assembled half-shells 6 and 7 have an extension in the form of a second socket 12, which serves to receive and fasten the exhaust pipe 3.
  • the half-shell 7 is formed in the plan view according to FIG. 3 (seen from the closed side facing away from the catalyst housing 1) as a round cover element 13, to which the socket 12 or the part of the socket 12 formed by the half-shell 7 is formed laterally .
  • the cover element 13 is arranged obliquely with respect to the end face 9 of the catalyst housing 1. Its flat orientation shown in FIG. 1 corresponds essentially to the axial direction of the main axis 4.
  • the cover element 13 has a section 14 pressed inwards towards the catalyst housing 1, which serves as a guiding device for the exhaust gas flow. This indented section 14 is, seen in plan view, approximately triangular and is located in the lower half of the cover element 13 facing the connector 12.
  • the base 15 of the indented section 14 is - as previously mentioned - approximately triangular with two identical legs 16 and 17 formed, which in this embodiment form an angle of approximately 110 °.
  • the tip of the triangle formed by the two legs 16 and 17 faces the nozzle 12 and is located approximately in the region of the transition 18 between the nozzle 12 and the circular surface of the cover element 13.
  • the base 19 of the base 15 of the pressed-in section 14 is light Provide outward curvature (seen from nozzle 12).
  • the length of the two legs 16 and 17 is dimensioned such that they extend close to the edge of the cover element 13.
  • the edge 20 formed by the indentation of the base surface 15 is between the base side 19 and the adjacent, not indented area of the cover element 13 formed so that the transition 21 to the non-depressed area of the cover element is approximately at right angles.
  • the transition 22 between the base 15 and the edge 20 is made at an acute angle, which has a relatively small radius of curvature. This transition 22 serves as a tear-off edge for the exhaust gas flow.
  • the base surface 15 is provided with a slight external curvature.
  • the half-shell 7 provided with the guiding device is covered on its outside by an additional half-shell 23, which is also connected to the edge 10 and 11, respectively.
  • Catalyst housing 1 is deflected. This will make it more even
  • the design of the inlet connection 2 and the arrangement of the guide device or the pressed-in section 14 are provided such that they are located on the longer outer section 24 of the inlet connection in relation to the flow pattern.
  • the position and size of the guide device and the position of the transition 22 and thus the tear-off edge are essentially dependent on the diameters or half-diameters of the catalytic converter housing 1 and the exhaust pipe 3 and on the angle of the two main axes 4 and 5.
  • the embodiment described can be produced as a deep-drawn molded part with little production outlay.
  • the tear-off edge or the guiding device can also be formed by an element inserted, for example welded, in the inlet connection 2.

Abstract

An exhaust fume system for an internal combustion engine has an inlet pipe (2) arranged between the exhaust fume pipe (3) at the input side and the catalyst carrier (1). In order to achieve a uniform stressing of the catalyst housing or substrate, in spite of an angled arrangement of the exhaust fume pipe and catalyst housing, a deflector is designed in the inlet pipe and arranged on the longer outer section of the inflow pipe, relative to the flow.

Description

Abgasanlage einer Brennkraftmaschine Exhaust system of an internal combustion engine
Die Erfindung betrifft eine Abgasanlage einer Brennkraftmaschine nach der Gattung des Hauptanspruches.The invention relates to an exhaust system of an internal combustion engine according to the preamble of the main claim.
Aus der DE 28 43 365 C2 ist eine Abgasanlage einer Brennkraftmaschine mit einem ovalzylindπschen Katalysatorgehause, einem zylindrischen Abgasrohr und einem dazwischen angeordneten Einstromtrichter bekannt, bei dem der Einstromtrichter mit Leitvorrichtungen zur Beeinflussung der Abgasdurchstromung versehen ist. Mit diesen Leitvorrichtungen soll eine Vergleichmaßigung der Katalysatordurchstromung erzielt werden, wobei die Leitvorrichtung gezielt so angeordnet sind, daß die Abgasbeaufschlagung des Katalysatortragers gleichmaßig auf seine gesamte ovale Stirnflache erfolgt. Dazu sind zwei gegenüberliegende Leitvorrichtungen in Form von Einpragungen des Gehäuses so angeordnet, daß sie sich an den beiden weniger gekrümmten Seitenflachen befinden und durch ihre V-formige Ausbildung die Abgase verstärkt in die Außenbereiche zu den stärker gekrümmten Seitenflachen umlenken. Ein derartiger Einstromstutzen ist geeignet für Abgasanlagen, bei denen die Achsen des eingangsseitigen Abgasrohres und des Katalysatortragers bzw. des Katalysatorgehauses miteinander fluchten oder parallel zueinander verlaufen. Wird die Abgasanlage aufgrund des beengten Bauraumes am Einbauort so ausgebildet, daß die Achsen des Abgasrohres und des Katalysatortragers nicht fluchten bzw. parallel zueinander verlaufen, ist mit einem derartigen Einstromstutzen keine gleichmäßige Beaufschlagung des Katalysatorgehäuses mehr möglich. Um dennoch eine gleichmäßige Beaufschlagung zu erreichen, mußte der in den Einstromstutzen einmundende Abschnitt des Abgasrohres sehr stark abgewinkelt werden, um wieder eine parallele bzw. fluchtende Achsrichtung auszubilden. Eine derartige Krümmung des Abgasrohres würde jedoch zu einer nicht gewollten Erhöhung des Abgasgegendruckes fuhren. Ohne diese Abwinkelung wurde die Beaufschlagung des Katalysatorgehäuses ungleichmäßig, wobei die dem eingeschlossenen Winkel der beiden Achsen abgewandte Gehausehälfte starker beaufschlagt wäre. Es ist demgegenüber eine Aufgabe der Erfindung, eine Abgasaniage einer Brennkraftmaschine dahingehend zu verbessern, daß eine gleichmäßige Beaufschlagung des Katalysatorgehäuses bzw. des Katalysatorträgers über die gesamte Stirnfläche auch dann sichergestellt ist, wenn die Katalysatoranströmung schräg erfolgt, d.h. wenn die Achsen des Katalysatorgehäuses bzw. desFrom DE 28 43 365 C2 an exhaust system of an internal combustion engine with an oval-cylindrical catalytic converter housing, a cylindrical exhaust pipe and an inflow funnel arranged between them is known, in which the inflow funnel is provided with guide devices for influencing the exhaust gas flow. These guide devices are intended to achieve a uniformity in the flow through the catalyst, the guide device being arranged in such a way that the exhaust gas is applied uniformly to the catalyst support over its entire oval end face. For this purpose, two opposite guide devices in the form of impressions of the housing are arranged so that they are located on the two less curved side surfaces and, through their V-shaped design, redirect the exhaust gases into the outer regions to the more curved side surfaces. Such an inlet connection is suitable for exhaust systems in which the axes of the inlet-side exhaust pipe and the catalyst carrier or the catalyst housing are aligned with one another or run parallel to one another. If the exhaust system is designed in such a way that the axes of the exhaust pipe and the catalyst carrier are not aligned or run parallel to one another due to the cramped installation space, it is no longer possible to apply the catalyst housing evenly with such an inlet connection. However, in order to achieve a uniform loading, the section of the exhaust pipe that merged into the inlet connection had to be bent very sharply in order to form a parallel or aligned axial direction again. Such a curvature of the exhaust pipe would, however, lead to an undesired increase in the exhaust gas back pressure. Without this angling, the action on the catalytic converter housing would be uneven, with the housing half facing away from the included angle of the two axes being subjected to greater stress. In contrast, it is an object of the invention to improve an exhaust system of an internal combustion engine in such a way that a uniform application of the catalyst housing or the catalyst carrier over the entire end face is ensured even when the catalyst flow occurs at an angle, ie when the axes of the catalyst housing or the
Katalysatorträgers und des eingangsseitigen Abgasrohres nicht fluchten bzw. parallel zueinander verlaufen.Do not align the catalyst carrier and the exhaust pipe on the inlet side or run parallel to each other.
Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Hauptanspruches gelöst.This object is achieved with the characterizing features of the main claim.
Wenn bei einer Abgasanlage, deren Katalysatorgehäuse und eingangsseitiges Abgasrohr nicht fluchtend bzw. nicht parallel verlaufend angeordnet sind, eine Leitvorrichtung im Einströmstutzen so angeordnet wird, daß sie sich auf den Strömungsverlauf bezogen an dessen längerem Außenabschnitt befindet, wird eine gezielte Ablösung der Strömung von der Außenwand erreicht. Diese führt zu einer Vergleichmäßigung der Anströmung des Katalysatorträgers und sorgt insbesondere für eine verstärkte Anströmung des innen (bezogen auf den Winkel zwischen den beiden Achsen) liegenden Abschnittes des Katalysatorgehäuses.If an exhaust system, the catalytic converter housing and the exhaust pipe on the inlet side are not aligned or not running parallel, a guide device is arranged in the inflow nozzle so that it is related to the flow pattern at its longer outer section, a targeted detachment of the flow from the outer wall reached. This leads to an equalization of the inflow of the catalyst carrier and in particular ensures an increased inflow of air to the section of the catalytic converter housing located internally (based on the angle between the two axes).
Eine derartige Leitvorrichtung kann besonders einfach und kostengünstig hergestellt werden, wenn diese als eingedrückter Abschnitt des Gehäuses des Einströmtrichters ausgebildet wird. Die Leitvorrichtung kann dabei fertigungstechnisch günstig bereits bei der Formgebung des Gehäuses des Einströmstutzens mit ausgeformt werden, so daß zusätzliche Fertigungsschritte nicht erforderlich werden.Such a guide device can be produced particularly simply and inexpensively if it is designed as a pressed-in section of the housing of the inflow funnel. The guiding device can be molded from a manufacturing point of view already during the shaping of the housing of the inflow connection piece, so that additional manufacturing steps are not necessary.
Eine besonders gleichmäßige Anströmung des Katalysatorgehäuses bzw. des Katalysatorträgers wird erreicht, wenn die Leitvorrichtung am Einströmstutzen mit einer Abrißkante versehen ist. Durch diese Abrißkante wird eine gezielte Umlenkung des Abgasstromes und eine Vergleichmäßigung über die anzuströmende Fläche erreicht. Eine besonders gute Ablösung des Abgasstromes vom Bereich der Außenwand wird erzielt, wenn die Leitvorrichtung einen, in Strömungsrichtung gesehen, auswärtsgebogenen Anströmabschnitt aufweist, an den sich die Abrißkante anschließt. Durch diese Ausbildung wird ein Ablösen der Wandströmung noch einmal verbessert.A particularly uniform flow against the catalyst housing or the catalyst carrier is achieved if the guide device is provided with a tear-off edge on the inflow nozzle. By means of this tear-off edge, a targeted deflection of the exhaust gas flow and an equalization over the surface to be flown are achieved. A particularly good detachment of the exhaust gas flow from the area of the outer wall is achieved if the guide device has an inflow section which is bent outward in the flow direction and which is followed by the tear-off edge. This design improves the detachment of the wall flow again.
Ein besonders einfach herzustellender und kostengünstiger Aufbau der Abgasanlage ergibt sich, wenn der Einströmtrichter aus mindestens zwei schalenartigen Gehäuseteilen zusammengesetzt ist, wobei vorteilhafter Weise die Leitvorrichtung vollständig in einem der schalenartigen Gehäuseteile ausgebildet ist.A particularly simple to manufacture and inexpensive construction of the exhaust system results when the inflow funnel is composed of at least two shell-like housing parts, the guide device advantageously being completely formed in one of the shell-like housing parts.
Weitere Vorteile und vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der Beschreibung.Further advantages and advantageous developments of the invention result from the subclaims and the description.
Ein Ausführungsbeispiel der Erfindung ist in der nachfolgenden Beschreibung und Zeichnung näher erläutert. Letztere zeigt inAn embodiment of the invention is explained in more detail in the following description and drawing. The latter shows in
Fig. 1 einen Längsschnitt durch eine nur teilweise dargestellte Abgasanlage,1 is a longitudinal section through an exhaust system shown only partially,
Fig. 2 eine Ansicht des Einströmstutzens in Richtung II nach Fig. 1 undFig. 2 is a view of the inlet port in the direction II of FIG. 1 and
Fig. 3 eine Ansicht einer Halbschale des Einströmstutzens in Richtung III nach Fig. 1.3 is a view of a half-shell of the inlet connector in the direction III of FIG. 1st
Die in den Figuren 1 bis 3 teilweise dargestellte Abgasanlage einer Brennkraftmaschine hat ein in diesem Ausführungsbeispiel kreiszylindrisch ausgebildetes Katalysatorgehäuse 1 , in dem ein nicht näher dargestellter Katalysatorträger angeordnet ist. Dieses Katalysatorgehäuse 1 ist über einen stirnseitig angeordneten Einströmstutzen 2 mit einem eingangsseitigen Abgasrohr 3 verbunden, das über einen nicht näher dargestellten Abgasrohrkrümmer mit den ebenfalls nicht näher dargestellten Brennräumen der Brennkraftmaschine verbunden ist. Das Abgasrohr 3 ist in diesem Ausführungsbeispiel ovaizylindrisch ausgebildet. Die Hauptachse 4 des Abgasrohres verläuft im Eintrittsbereich in den Einströmstutzen 2 in einem Winkel α von etwa 115° zur Längsachse 5 des Katalysatorgehäuses 1. Der Einströmstutzen 2 besteht in diesem Ausführungsbeispiel aus zwei Halbschalen 6, 7. Die Halbschale 6 hat einen kurzen, zylindrisch angeformten Stutzen 8, der im Bereich der Stirnseite 9 des Katalysatorgehäuses 1 mit diesem verbunden ist. An der dem Katalysatorgehäuse 1 abgewandten Seite hat die Halbschale 6 einen kragenartig nach außen abgewinkelten Befestigungsrand 10, an dem ein entsprechender kragenartig abgewinkelter Befestigungsrand 11 der Halbschale 7 anliegt. Durch Verschweißen der beiden aufeinanderliegenden Befestigungsränder 10 und 11 sind die beiden Halbschalen verbunden und bilden den Einströmstutzen 2. Die zusammengesetzten Halbschalen 6 und 7 haben einen Fortsatz in Form eines zweiten Stutzens 12, der zur Aufnahme und Befestigung des Abgasrohres 3 dient.The exhaust system of an internal combustion engine, which is partially shown in FIGS. 1 to 3, has a catalytic converter housing 1 which in this exemplary embodiment is circular-cylindrical and in which a catalytic converter support (not shown in detail) is arranged. This catalytic converter housing 1 is connected via an inlet connection 2 arranged at the end to an inlet-side exhaust pipe 3, which is connected to the combustion chambers of the internal combustion engine, also not shown, via an exhaust pipe elbow (not shown). In this exemplary embodiment, the exhaust pipe 3 is oval-cylindrical. The main axis 4 of the exhaust pipe extends in the inlet area into the inlet connection 2 at an angle α of approximately 115 ° to the longitudinal axis 5 of the catalyst housing 1. In this exemplary embodiment, the inflow neck 2 consists of two half-shells 6, 7. The half-shell 6 has a short, cylindrically shaped connecting piece 8 which is connected to the catalyst housing 1 in the region of the end face 9 thereof. On the side facing away from the catalytic converter housing 1, the half-shell 6 has a fastening edge 10 which is angled outward in the manner of a collar and against which a corresponding fastening edge 11 of the half-shell 7 which is angled in the manner of a collar bears. By welding the two superimposed mounting edges 10 and 11, the two half-shells are connected and form the inflow socket 2. The assembled half-shells 6 and 7 have an extension in the form of a second socket 12, which serves to receive and fasten the exhaust pipe 3.
Die Halbschale 7 ist in der Draufsicht nach Fig.3 (von der dem Katalysatorgehäuse 1 abgewandten, geschlossenen Seite her gesehen) als rundes Deckelelement 13 ausgebildet, an das der Stutzen 12 bzw. der durch die Halbschale 7 gebildete Teil des Stutzens 12 seitlich angeformt ist. Das Deckelelement 13 ist gegenüber der Stirnseite 9 des Katalysatorgehäuses 1 schräg angeordnet. Seine in Fig. 1 ersichtliche flächige Ausrichtung entspricht im wesentlichen der Achsrichtung der Hauptachse 4. Das Deckelelement 13 hat einen nach innen, zum Katalysatorgehäuse 1 hin, eingedrückten Abschnitt 14, der als Leitvorrichtung für den Abgasstrom dient. Dieser eingedrückte Abschnitt 14 ist, in der Draufsicht gesehen, etwa dreieckförmig ausgebildet und befindet sich in der dem Stutzen 12 zugewandten unteren Hälfte des Deckelelementes 13. Die Grundfläche 15 des eingedrückten Abschnittes 14 ist - wie zuvor angeführt - etwa dreieckförmig mit zwei gleichen Schenkeln 16 und 17 ausgebildet, die in diesem Ausführungsbeispiel einen Winkel von etwa 110° einschließen. Die durch die beiden Schenkel 16 und 17 gebildete Spitze des Dreieckes ist dem Stutzen 12 zugewandt und befindet sich etwa im Bereich des Überganges 18 zwischen Stutzen 12 und der Kreisfläche des Deckelelementes 13. Die Grundseite 19 der Grundfläche 15 des eingedrückten Abschnittes 14 ist mit einer leichten Auswärtskrümmung (vom Stutzen 12 aus gesehen) versehen. Die Länge der beiden Schenkel 16 und 17 ist so bemessen, daß diese bis nahe an den Rand des Deckelelementes 13 reichen. Der durch die Eindrückung der Grundfläche 15 ausgebildete Rand 20 zwischen Grundseite 19 und dem angrenzenden, nicht eingedrückten Bereich des Deckelelementes 13 ist so ausgebildet, daß der Übergang 21 zum nicht eingedrückten Bereich des Deckelelementes etwa rechtwinkelig verläuft. Der Übergang 22 zwischen der Grundfläche 15 und dem Rand 20 ist in einem spitzen Winkel ausgeführt, der einen relativ kleinen Krümmungsradius aufweist. Dieser Übergang 22 dient als Abrißkante für den Abgasstrom. Um die Steifigkeit der Halbschale 7 und des Einstromstutzens 2 zu erhohen und einen gunstigeren Strömungsverlauf zu erzielen, ist die Grundflache 15 mit einer leichten Außenwölbung versehen.The half-shell 7 is formed in the plan view according to FIG. 3 (seen from the closed side facing away from the catalyst housing 1) as a round cover element 13, to which the socket 12 or the part of the socket 12 formed by the half-shell 7 is formed laterally . The cover element 13 is arranged obliquely with respect to the end face 9 of the catalyst housing 1. Its flat orientation shown in FIG. 1 corresponds essentially to the axial direction of the main axis 4. The cover element 13 has a section 14 pressed inwards towards the catalyst housing 1, which serves as a guiding device for the exhaust gas flow. This indented section 14 is, seen in plan view, approximately triangular and is located in the lower half of the cover element 13 facing the connector 12. The base 15 of the indented section 14 is - as previously mentioned - approximately triangular with two identical legs 16 and 17 formed, which in this embodiment form an angle of approximately 110 °. The tip of the triangle formed by the two legs 16 and 17 faces the nozzle 12 and is located approximately in the region of the transition 18 between the nozzle 12 and the circular surface of the cover element 13. The base 19 of the base 15 of the pressed-in section 14 is light Provide outward curvature (seen from nozzle 12). The length of the two legs 16 and 17 is dimensioned such that they extend close to the edge of the cover element 13. The edge 20 formed by the indentation of the base surface 15 is between the base side 19 and the adjacent, not indented area of the cover element 13 formed so that the transition 21 to the non-depressed area of the cover element is approximately at right angles. The transition 22 between the base 15 and the edge 20 is made at an acute angle, which has a relatively small radius of curvature. This transition 22 serves as a tear-off edge for the exhaust gas flow. In order to increase the rigidity of the half-shell 7 and the inlet connection 2 and to achieve a more favorable flow pattern, the base surface 15 is provided with a slight external curvature.
Um die Steifigkeit und Biegefestigkeit des Einström Stutzens zu erhohen, ist die mit der Leitvorrichtung versehene Halbschale 7 auf ihrer Ausßenseite durch eine zusätzliche Halbschale 23 überdeckt, die ebenfalls mit dem Rand 10 bzw. 11 verbunden ist.In order to increase the rigidity and bending strength of the inflow connection piece, the half-shell 7 provided with the guiding device is covered on its outside by an additional half-shell 23, which is also connected to the edge 10 and 11, respectively.
Durch den als Leitvorrichtung für den Abgasstrom dienenden eingedrückten AbschnittThrough the indented section serving as a guiding device for the exhaust gas flow
14 wird der Abgasstrom im Bereich dieser Eindrückung so abgelenkt, daß ein wesentlicher Teil des Abgasstromes in den mittleren und unteren Bereich (Fig. 1) des14, the exhaust gas flow is deflected in the area of this indentation so that a substantial part of the exhaust gas flow in the middle and lower area (Fig. 1) of
Katalysatorgehauses 1 abgelenkt wird. Damit wird eine gleichmäßigereCatalyst housing 1 is deflected. This will make it more even
Beaufschlagung des Katalysatorgehäuses und damit des Katalysatorträgers erzielt.Actuation of the catalyst housing and thus the catalyst carrier achieved.
Die Ausbildung des Einstrόmstutzens 2 und die Anordnung der Leitvorrichtung bzw. des eingedrückten Abschnittes 14 sind so vorgesehen, daß sich diese auf den Stromungsverlauf bezogen am längeren Außenabschnitt 24 des Einstromstutzens befinden.The design of the inlet connection 2 and the arrangement of the guide device or the pressed-in section 14 are provided such that they are located on the longer outer section 24 of the inlet connection in relation to the flow pattern.
Die Lage und Größe der Leitvorrichtung und die Lage des Überganges 22 und damit der Abrißkante sind im wesentlichen abhängig von den Durchmessern bzw. Halbmessern des Katalysatorgehauses 1 und des Abgasrohres 3 und vom Winkel der beiden Hauptachsen 4 und 5.The position and size of the guide device and the position of the transition 22 and thus the tear-off edge are essentially dependent on the diameters or half-diameters of the catalytic converter housing 1 and the exhaust pipe 3 and on the angle of the two main axes 4 and 5.
Die beschriebene Ausführungsform kann mit geringem fertigungstechnischen Aufwand als tiefgezogenes Formteil hergestellt werden. Im Gegensatz zum hier dargestellten Ausführungsbeispiel können die Abrißkante bzw. die Leitvorrichtung auch durch ein m den Einströmstutzen 2 eingesetztes, beispielsweise eingeschweißtes Element ausgebildet sein. The embodiment described can be produced as a deep-drawn molded part with little production outlay. In contrast to the exemplary embodiment shown here, the tear-off edge or the guiding device can also be formed by an element inserted, for example welded, in the inlet connection 2.

Claims

Patentansprüche claims
1. Abgasanlage einer Brennkraftmaschine mit einem kreis- oder ovalzylindπschen Kataiysatorgehause (1) mit großem Durchmesser bzw. mit großen Halbmessern, einem eingangsseitigen kreis- oder ovalzylindπschen Abgasrohr (3) mit kleinem Durchmesser bzw. mit kleinen Halbmessern und mit einem dazwischen angeordneten Einstromstutzen (2), der mit mindestens einer stromungsbeeinflussenden Leitvorrichtung (14,22) versehen ist, dadurch gekennzeichnet, daß die Achse (5) des Katalysatorgehauses (1) und die Achse (4) des Abgasrohres (3) in einem Winkel zwischen 100° und etwa 185° zueinander verlaufen, wobei der Einstromstutzen auf den Stromungsverlauf bezogen einen kürzeren Innenabschnitt (25) und einen längeren Außenabschnitt (24) aufweist, und daß die Leitvorrichtung am Außenabschnitt angeordnet ist.1.Exhaust system of an internal combustion engine with a circular or oval-cylindrical catalyst housing (1) with a large diameter or with large half-cutters, an inlet-side circular or oval-cylindrical exhaust-gas pipe (3) with a small diameter or with small half-cutters and with an inlet connection arranged in between (2 ), which is provided with at least one flow-influencing guide device (14, 22), characterized in that the axis (5) of the catalytic converter housing (1) and the axis (4) of the exhaust pipe (3) at an angle between 100 ° and approximately 185 ° run to each other, the inflow socket having a shorter inner section (25) and a longer outer section (24) based on the flow pattern, and in that the guide device is arranged on the outer section.
2. Abgasanlage nach Anspruch 1 , dadurch gekennzeichnet, daß die Leitvorrichtung (14, 22) ein eingedruckter Abschnitt des Gehäuses (6, 7) des Einstromstutzens (2) ist2. Exhaust system according to claim 1, characterized in that the guide device (14, 22) is a pressed-in section of the housing (6, 7) of the inlet connector (2)
3. Abgasanlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Leitvorrichtung (14, 22) mit einer Abrißkante (22) versehen ist3. Exhaust system according to one of the preceding claims, characterized in that the guide device (14, 22) is provided with a tear-off edge (22)
4. Abgasanlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der eingedruckte Abschnitt (14) einen auswärts gebogenen Anstromabschnitt (15) aufweist, an den sich die Abrißkante (22) anschließt.4. Exhaust system according to one of the preceding claims, characterized in that the impressed section (14) has an outwardly curved inflow section (15) to which the tear-off edge (22) connects.
5. Abgasanlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Einstromstutzen (2) aus mindestens zwei schalenartigen Gehauseteiien (6, 7) zusammengesetzt ist.5. Exhaust system according to one of the preceding claims, characterized in that the inlet connection (2) is composed of at least two shell-like housing parts (6, 7).
6. Abgasanlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Leitvorrichtung (14, 22) ein in das Gehäuse (6, 7) des Einstromstutzens (2) eingesetztes Formteil ist. 6. Exhaust system according to one of the preceding claims, characterized in that the guide device (14, 22) is a molded part inserted into the housing (6, 7) of the inflow connector (2).
PCT/EP1997/004479 1996-08-21 1997-08-16 Exhaust fume system for an internal combustion engine WO1998007967A1 (en)

Applications Claiming Priority (2)

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DE19633563.9 1996-08-21
DE1996133563 DE19633563C2 (en) 1996-08-21 1996-08-21 Exhaust system of an internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2388023A1 (en) * 2009-03-16 2012-10-05 Honda Motor Co. Ltd Exhaust device for engine
CN104204438A (en) * 2012-03-22 2014-12-10 五十铃自动车株式会社 Internal combustion engine
US20150330279A1 (en) * 2014-05-15 2015-11-19 GM Global Technology Operations LLC External exhaust guiding flow chambers for multiple catalyst architecture
JP2018076856A (en) * 2016-11-11 2018-05-17 いすゞ自動車株式会社 Exhaust system structure of internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2772071B1 (en) * 1997-12-05 2000-01-14 Renault EXHAUST DEVICE FOR INTERNAL COMBUSTION ENGINE
KR100308952B1 (en) * 1999-05-10 2001-09-26 이계안 Oblique close coupled catalyst exit c0nnector
DE10009124B4 (en) * 2000-02-26 2008-10-23 Volkswagen Ag Catalyst for cleaning an exhaust gas of an internal combustion engine
JP2006017018A (en) * 2004-06-30 2006-01-19 Toyota Motor Corp Exhaust pipe line structure for vehicle
FR2874649B1 (en) * 2004-08-31 2008-02-22 Faurecia Sys Echappement CATALYTIC PURIFICATION ORGAN
JP4920532B2 (en) 2007-09-13 2012-04-18 日野自動車株式会社 Exhaust purification device
JP5054817B2 (en) * 2008-05-14 2012-10-24 株式会社小松製作所 Exhaust treatment device and manufacturing method thereof
FR2935742B1 (en) * 2008-09-08 2012-08-10 Faurecia Sys Echappement EXHAUST GAS CLEANING ASSEMBLY WITH INPUT DEFLECTOR
FR2935743A3 (en) * 2008-09-11 2010-03-12 Renault Sas Exhaust line for internal combustion engine, has gas and fuel mixture flow separating and recirculating arrangement i.e. flat surface section, provided in upstream of converter and over length of conduit connection section
DE102010006829B4 (en) * 2010-02-03 2013-08-14 Benteler Automobiltechnik Gmbh exhaust system
DE102011079906A1 (en) 2011-07-27 2013-01-31 Bayerische Motoren Werke Aktiengesellschaft Exhaust gas system for internal combustion engine of motor vehicle, has device for introduction of ammonia in exhaust gas flow, and mixing section for distributing ammonia in exhaust gas flow with mixing section axis

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345383A1 (en) * 1973-09-08 1975-03-20 Daimler Benz Ag I.C. engine with exhaust gas afterburner - has exhaust system with catalytic gas permeable insets within exhaust ducts
DE2843365A1 (en) 1978-10-05 1980-04-24 Daimler Benz Ag Inlet to IC engine afterburner - has indentations on short sides to give more even entering gas flow
DE9412553U1 (en) * 1994-08-04 1994-11-10 Schmole Michael Exhaust gas catalytic converter for internal combustion engines
DE4408130A1 (en) * 1994-03-10 1995-09-14 Bayerische Motoren Werke Ag Device for exhaust gas purification in internal combustion engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA972972A (en) * 1972-04-07 1975-08-19 Stanley B. Wallis Gas distribution system for a catalytic converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345383A1 (en) * 1973-09-08 1975-03-20 Daimler Benz Ag I.C. engine with exhaust gas afterburner - has exhaust system with catalytic gas permeable insets within exhaust ducts
DE2843365A1 (en) 1978-10-05 1980-04-24 Daimler Benz Ag Inlet to IC engine afterburner - has indentations on short sides to give more even entering gas flow
DE4408130A1 (en) * 1994-03-10 1995-09-14 Bayerische Motoren Werke Ag Device for exhaust gas purification in internal combustion engines
DE9412553U1 (en) * 1994-08-04 1994-11-10 Schmole Michael Exhaust gas catalytic converter for internal combustion engines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2388023A1 (en) * 2009-03-16 2012-10-05 Honda Motor Co. Ltd Exhaust device for engine
CN104204438A (en) * 2012-03-22 2014-12-10 五十铃自动车株式会社 Internal combustion engine
US20150089932A1 (en) * 2012-03-22 2015-04-02 Isuzu Motors Limited Internal combustion engine
EP2846016A4 (en) * 2012-03-22 2016-01-20 Isuzu Motors Ltd Internal combustion engine
US9593612B2 (en) 2012-03-22 2017-03-14 Isuzu Motors Limited Internal combustion engine
US20150330279A1 (en) * 2014-05-15 2015-11-19 GM Global Technology Operations LLC External exhaust guiding flow chambers for multiple catalyst architecture
US9551266B2 (en) * 2014-05-15 2017-01-24 GM Global Technology Operations LLC External exhaust guiding flow chambers for multiple catalyst architecture
JP2018076856A (en) * 2016-11-11 2018-05-17 いすゞ自動車株式会社 Exhaust system structure of internal combustion engine

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