EP1920139B1 - Subassembly having a plurality of exhaust pipes with air gap insulation and a connecting pipe, and a method of producing a connecting end of an exhaust pipe with air gap insulation - Google Patents

Subassembly having a plurality of exhaust pipes with air gap insulation and a connecting pipe, and a method of producing a connecting end of an exhaust pipe with air gap insulation Download PDF

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Publication number
EP1920139B1
EP1920139B1 EP06776544A EP06776544A EP1920139B1 EP 1920139 B1 EP1920139 B1 EP 1920139B1 EP 06776544 A EP06776544 A EP 06776544A EP 06776544 A EP06776544 A EP 06776544A EP 1920139 B1 EP1920139 B1 EP 1920139B1
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EP
European Patent Office
Prior art keywords
tube
pipe
gas
outer tube
tubes
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Expired - Fee Related
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EP06776544A
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German (de)
French (fr)
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EP1920139A1 (en
Inventor
Michael Thome
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Faurecia Emissions Control Technologies Germany GmbH
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Emcon Technologies Germany Augsburg GmbH
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Publication of EP1920139A1 publication Critical patent/EP1920139A1/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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • 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
    • 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
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/20—Methods or apparatus for fitting, inserting or repairing different elements by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof

Definitions

  • the invention relates to an assembly, in particular for an exhaust system, with at least two clam-shell gas guide tubes, each having an outer tube and an inner tube, and a connecting tube which is connected in a gastight manner with the outer tubes, so that a transition from the two gas guide tubes to the connecting tube created is, wherein the outer tubes each have a connecting edge at its end associated with the connecting pipe, which is connected to the connecting edge of the adjacent gas guide tube.
  • the invention also relates to a method for producing a connection end of a clam shell gas guide tube, formed from an outer tube and an inner tube.
  • Such a gas guide tube is also known as air gap insulated exhaust pipe. Due to the double-walled construction, some problems arise when two or more gas guide tubes, for example, exhaust manifold side, must be connected to a single connecting pipe. Since all tubes usually have a circular cross-section, the problem arises of connecting two circular tubes to a single circular tube. So far, in the prior art, the problem has been solved so that the connecting pipe associated ends of the gas guide tubes were cut off and there special fittings was welded. It has been generally believed that otherwise, a cross-sectional shape suitable for a gas-tight connection with the connecting pipe can not be obtained.
  • the fitting to be mounted was made separately from the outer tube and had a circular cross-section at the end associated with the gas guide tube so that it could be welded there and a D-shaped cross-section at its opposite end. This makes it possible to arrange the two gas guide tubes together so that the two D-shaped cross sections are back to back. The straight edges of the connecting pieces then form a connecting edge, which can be welded to the adjacent connecting edge. Overall, the two fittings form together a cross section which resembles the shape of a slot.
  • the connecting pipe is designed with its end facing the gas guide tubes with the same cross section, so that the connecting pipe can be plugged onto the two gas guide tubes and welded there.
  • a disadvantage of this type of connection is the high cost, which is required to provide an end to the gas guide tubes, which is suitable for gas-tight connection with the connecting pipe.
  • US 5,787,709 Disclosed an assembly with two clam shell gas guide tubes and a connecting pipe, wherein the outer tubes have a connecting edge.
  • the connecting edge is made in one piece with the outer tubes.
  • the object of the invention is to provide an assembly of the type mentioned above and a method for producing a terminal end of a clam shell gas guide tube, which is characterized by lower costs.
  • the connecting edge is integral with the outer tube and is obtained by plastic deformation of the outer tube.
  • it is provided in a method of the type mentioned above that a terminal end of the outer tube to which a connection pipe is later attached is plastically deformed by means of a punch.
  • the invention is based on the idea not to provide the suitable cross-sectional shape on a separate component and to connect it to the outer tube of the corresponding gas guide tube, as is done in the prior art, but to transform the outer tube itself directly into the desired shape.
  • a punch is used, which is pressed into the connection pipe facing the terminal end of the outer tube.
  • the outer tube is deformed so that the connection edge results, which can then be connected to the adjacent connection edge of the further gas guide tube.
  • the connecting end of the two outer pipes of the gas guiding pipes preferably has a D-shaped cross section in each case.
  • the connecting ends of the outer pipes preferably have a circular sector-shaped cross section.
  • the outer tube can be deformed in its final cross-section in a single embossing step, or several embossing steps can be used which bring the end of the outer tube associated with the connecting tube into its final shape over several intermediate stages.
  • a single-stage forming process is characterized by particularly low costs.
  • a multi-stage forming process leads to a lower axial compression of the outer tube.
  • FIG. 1 two gas guide tubes 5 can be seen, which are connected to a connecting pipe 7.
  • the two gas guide tubes 5 each have a Outer tube 10 and an inner tube 12.
  • the gas guide tubes are used in particular for guiding exhaust gas of an internal combustion engine and are also referred to as air gap insulated exhaust pipes.
  • the connecting pipe 7 is formed as a single shell.
  • the connecting pipe can also be designed with two or more shells.
  • Under connection pipe is understood here as another exhaust-carrying component, for example, the inlet or outlet funnel of a catalyst, a diesel particulate filter, etc.
  • the walls of the various tubes are symbolized by a single line in all drawings, and is between adjacent walls a gap shown to distinguish the individual components better from each other. Also, the spacers which are arranged between the outer tube and the inner tube, not shown.
  • the two gas guide tubes 5 each have specially shaped connecting ends 9, which are inserted into the connecting tube 7 adjacent to one another.
  • the connecting pipe 7 at its the gas guide tubes 5 facing the end of a cross-section, which is similar to a slot.
  • the outer tubes 10 of the gas guide tubes 5 each have a D-shaped cross section at their connecting end facing the connecting tube 7.
  • the two cross sections are arranged so that they lie back to back.
  • the corresponding edges may be referred to as connection edges because they are welded together.
  • the weld is indicated by the reference numeral 16. From the weld 16 extends in the axial direction another weld 17, which is formed as a fillet weld between the two outer tubes 10. This extends to about the end of the connecting pipe 7.
  • the end of the connecting pipe 7 is welded by a peripheral weld 18 with the outer tubes 10. In this way, a total gas-tight connection between the gas guide tubes 5 and the connecting pipe 7 is ensured.
  • the gas guide tube is inserted into a tool 20, which consists of an upper part 22 and a lower part 24.
  • the tool is designed so that it clamps the outer tube 10 reliably.
  • the tool 20 In the area of the terminal end of the outer tube 10 to be received in the connection pipe 7, the tool 20 has a recess whose shape corresponds to the cross section of the connection end.
  • a punch 26 is pressed into the outer tube 10, so that this is widened and plastically deformed.
  • the punch 26 is a hollow punch with a recess 28 for the inner tube 12. At its front edge of the punch 26 is provided with two insertion edges 29, 30, which facilitate the insertion between the inner tube 12 and the outer tube 10.
  • the forming of the connecting pipe associated end of the outer tube 10 can be done in a single step, or, as in the FIGS. 4a to 4c shown in several steps.
  • the outer tube 10 is seen with the inner tube 12 mounted inside, wherein the outer tube 10 is in the initial state.
  • the gas guide tube 5 can be seen with the outer tube 10 shaped into an intermediate state.
  • the cross-sectional shape of the outer tube approaches a "D".
  • Figure 4c is the gas guide tube with completely formed outer tube 10 can be seen. It is the connection edge 14 is formed, which is welded to the connection edge 14 of the second gas guide tube 5.
  • FIG. 5 schematically is an example shown how three gas guide tubes can be connected to a connecting pipe.
  • the connecting tube 7 associated ends of the respective outer tubes 10 are reshaped so that they have a circular sector-shaped cross-section. It is also possible with suitable design of the terminal ends of the gas guide tubes to connect more than three gas guide tubes with a connecting pipe.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention relates to a subassembly, in particular for an exhaust system, having at least two double-shell gas-carrying pipes (5), each with an outer pipe (10) and an inner pipe (12), and a connecting pipe (7) which is connected to the outer pipes (10) in a gastight manner such that a transition is created from the two gas-carrying pipes (5) to the connecting pipe (7), wherein the outer pipes (10), at their end assigned to the connecting pipe (7), have a respective connecting margin (14) which is connected to the connecting margin (14) of the adjacent gas-carrying pipe (5), characterized in that the connecting margin (14) is made in one piece with the outer pipe (10) and is obtained by plastic deformation of the outer pipe (10). The invention also relates to a method of producing a connecting end of a double-shell gas-carrying pipe (5) formed from an outer pipe (10) and an inner pipe (12), characterized in that a connecting end of the outer pipe (10), to which a connecting pipe (7) is subsequently attached, is plastically deformed by means of a punch (26).

Description

Die Erfindung betrifft eine Baugruppe, insbesondere für eine Abgasanlage, mit mindestens zwei zweischaligen Gasführungsrohren, die jeweils ein Außenrohr und ein Innenrohr aufweisen, und einem Anschlußrohr, das gasdicht mit den Außenrohren verbunden ist, so daß ein Übergang von den beiden Gasführungsrohren zu dem Anschlußrohr geschaffen ist, wobei die Außenrohre an ihrem dem Anschlußrohr zugeordneten Ende jeweils einen Verbindungsrand aufweisen, der mit dem Verbindungsrand des benachbarten Gasführungsrohres verbunden ist. Die Erfindung betrifft auch ein Verfahren zum Herstellen eines Anschlußendes eines zweischaligen Gasführungsrohres, gebildet aus einem Außenrohr und einem Innenrohr.The invention relates to an assembly, in particular for an exhaust system, with at least two clam-shell gas guide tubes, each having an outer tube and an inner tube, and a connecting tube which is connected in a gastight manner with the outer tubes, so that a transition from the two gas guide tubes to the connecting tube created is, wherein the outer tubes each have a connecting edge at its end associated with the connecting pipe, which is connected to the connecting edge of the adjacent gas guide tube. The invention also relates to a method for producing a connection end of a clam shell gas guide tube, formed from an outer tube and an inner tube.

Ein solches Gasführungsrohr ist auch als luftspaltisoliertes Abgasrohr bekannt. Aufgrund des doppelwandigen Aufbaus ergeben sich einige Probleme, wenn zwei oder mehr Gasführungsrohre, beispielsweise abgaskrümmerseitig, an ein einziges Anschlußrohr angeschlossen werden müssen. Da alle Rohre üblicherweise einen kreisförmigen Querschnitt haben, stellt sich das Problem, zwei kreisförmige Rohre an ein einziges kreisförmiges Rohr anzuschließen. Bisher wurde im Stand der Technik das Problem so gelöst, daß die dem Anschlußrohr zugeordneten Enden der Gasführungsrohre abgeschnitten wurden und dort spezielle Anschlußstücke angeschweißt wurde. Es wurde allgemein angenommen, daß auf andere Weise keine für eine gasdichte Verbindung mit dem Anschlußrohr geeignete Querschnittsform erhalten werden kann. Das anzubringende Anschlußstück wurde getrennt vom Außenrohr hergestellt und wies am dem Gasführungsrohr zugeordneten Ende einen kreisförmigen Querschnitt auf, so daß es dort angeschweißt werden kann, und an seinem entgegengesetzten Ende einen D-förmigen Querschnitt. Dies ermöglicht, die beiden Gasführungsrohre so aneinander anzuordnen, daß die beiden D-förmigen Querschnitte Rücken an Rücken liegen. Die geraden Ränder der Anschlußstücke bilden dann einen Verbindungsrand, der mit dem benachbarten Verbindungsrand verschweißt werden kann. Insgesamt bilden die beiden Anschlußstücke zusammen einen Querschnitt, welcher der Form eines Langlochs ähnelt. Das Anschlußrohr wird mit seinem den Gasführungsrohren zugewandten Ende mit dem selben Querschnitt ausgeführt, so daß das Anschlußrohr auf die beiden Gasführungsrohre aufgesteckt und dort verschweißt werden kann.Such a gas guide tube is also known as air gap insulated exhaust pipe. Due to the double-walled construction, some problems arise when two or more gas guide tubes, for example, exhaust manifold side, must be connected to a single connecting pipe. Since all tubes usually have a circular cross-section, the problem arises of connecting two circular tubes to a single circular tube. So far, in the prior art, the problem has been solved so that the connecting pipe associated ends of the gas guide tubes were cut off and there special fittings was welded. It has been generally believed that otherwise, a cross-sectional shape suitable for a gas-tight connection with the connecting pipe can not be obtained. The fitting to be mounted was made separately from the outer tube and had a circular cross-section at the end associated with the gas guide tube so that it could be welded there and a D-shaped cross-section at its opposite end. This makes it possible to arrange the two gas guide tubes together so that the two D-shaped cross sections are back to back. The straight edges of the connecting pieces then form a connecting edge, which can be welded to the adjacent connecting edge. Overall, the two fittings form together a cross section which resembles the shape of a slot. The connecting pipe is designed with its end facing the gas guide tubes with the same cross section, so that the connecting pipe can be plugged onto the two gas guide tubes and welded there.

Nachteilig bei dieser Art der Verbindung ist der hohe Aufwand, der erforderlich ist, um an den Gasführungsrohren ein Ende vorzusehen, das zur gasdichten Verbindung mit dem Anschlußrohr geeignet ist.A disadvantage of this type of connection is the high cost, which is required to provide an end to the gas guide tubes, which is suitable for gas-tight connection with the connecting pipe.

US 5,787,709 Offenbart eine Baugruppe mit zwei zweischaligen Gasführungsrohren und einem Anschlussrohr, wobei die Außenrohre einen Verbindungsrand aufweisen. Der Verbindungsrand ist einstückig mit dem Außenrohre ausgeführt. US 5,787,709 Disclosed an assembly with two clam shell gas guide tubes and a connecting pipe, wherein the outer tubes have a connecting edge. The connecting edge is made in one piece with the outer tubes.

Die Aufgabe der Erfindung besteht darin, eine Baugruppe der eingangs genannten Art sowie ein Verfahren zur Herstellung eines Anschlußendes eines zweischaligen Gasführungsrohres zu schaffen, die bzw. das sich durch geringere Kosten auszeichnet.The object of the invention is to provide an assembly of the type mentioned above and a method for producing a terminal end of a clam shell gas guide tube, which is characterized by lower costs.

Erfindungsgemäß ist zur Lösung dieser Aufgabe bei einer Baugruppe der eingangs genannten Art vorgesehen, daß der Verbindungsrand einstückig mit dem Außenrohr ausgeführt ist und durch plastisches Verformen des Außenrohres erhalten ist. Erfindungsgemäß ist bei einem Verfahren der eingangs genannten Art vorgesehen, daß ein Anschlußende des Außenrohres, an dem später ein Anschlußrohr angebracht wird, mittels eines Stempels plastisch verformt wird.According to the invention is provided to solve this problem in an assembly of the type mentioned that the connecting edge is integral with the outer tube and is obtained by plastic deformation of the outer tube. According to the invention, it is provided in a method of the type mentioned above that a terminal end of the outer tube to which a connection pipe is later attached is plastically deformed by means of a punch.

Die Erfindung beruht auf dem Grundgedanken, die geeignete Querschnittsform nicht mehr an einem separaten Bauteil vorzusehen und dieses mit dem Außenrohr des entsprechenden Gasführungsrohres zu verbinden, wie dies im Stand der Technik geschieht, sondern das Außenrohr selbst direkt in die gewünschte Form umzuformen. Zu diesem Zweck wird ein Stempel verwendet, der in das dem Anschlußrohr zugewandten Anschlußende des Außenrohres eingepreßt wird. Dadurch wird das Außenrohr so verformt, daß sich der Verbindungsrand ergibt, der dann mit dem benachbarten Verbindungsrand des weiteren Gasführungsrohres verbunden werden kann.The invention is based on the idea not to provide the suitable cross-sectional shape on a separate component and to connect it to the outer tube of the corresponding gas guide tube, as is done in the prior art, but to transform the outer tube itself directly into the desired shape. For this purpose, a punch is used, which is pressed into the connection pipe facing the terminal end of the outer tube. As a result, the outer tube is deformed so that the connection edge results, which can then be connected to the adjacent connection edge of the further gas guide tube.

Wenn zwei Gasführungsrohre in dem Anschlußrohr aufzunehmen sind, weist das Anschlußende der beiden Außenrohre der Gasführungsrohre jeweils vorzugsweise einen D-förmigen Querschnitt auf. Wenn dagegen drei Gasführungsrohre in dem Anschlußrohr aufzunehmen sind, weisen die Anschlußenden der Außenrohre vorzugsweise einen kreissektorförmigen Querschnitt auf. Es sind natürlich auch andere Querschnittsformen am Anschlußende des Außenrohres denkbar. Wichtig ist nur, daß sich zwischen den aneinander anliegenden Außenrohren kein oder wenigstens kein großer Spalt bildet, so daß die Außenrohre innerhalb des Anschlußrohres gasdicht miteinander verbunden werden können, beispielsweise durch eine Schweißnaht.When two gas guide tubes are to be accommodated in the connecting pipe, the connecting end of the two outer pipes of the gas guiding pipes preferably has a D-shaped cross section in each case. In contrast, if three gas guide tubes are to be accommodated in the connecting pipe, the connecting ends of the outer pipes preferably have a circular sector-shaped cross section. There are of course other cross-sectional shapes on Connection end of the outer tube conceivable. It is only important that no or at least no large gap forms between the adjoining outer tubes, so that the outer tubes can be connected to each other within the connecting tube gas-tight, for example by a weld.

Wenn das Anschlußende des Außenrohres des Gasführungsrohres plastisch verformt wird, nachdem das Innenrohr angebracht ist, wird ein Hohlstempel verwendet, der eine Ausnehmung für das Innenrohr aufweist. Auf diese Weise beeinträchtigt das Innenrohr die plastische Verformung des Außenrohres nicht.When the terminal end of the outer tube of the gas guide tube is plastically deformed after the inner tube is attached, a hollow die having a recess for the inner tube is used. In this way, the inner tube does not affect the plastic deformation of the outer tube.

Je nach den Anforderungen kann das Außenrohr in einem einzigen Prägeschritt in seinen endgültigen Querschnitt verformt werden, oder es können mehrere Prägeschritte verwendet werden, die das dem Anschlußrohr zugeordnete Ende des Außenrohres über mehrere Zwischenstadien in seine endgültige Form bringen. Ein einstufiges Umformverfahren zeichnet sich durch besonders geringe Kosten aus. Ein mehrstufiges Umformverfahren führt zu einer geringeren axialen Stauchung des Außenrohres.Depending on the requirements, the outer tube can be deformed in its final cross-section in a single embossing step, or several embossing steps can be used which bring the end of the outer tube associated with the connecting tube into its final shape over several intermediate stages. A single-stage forming process is characterized by particularly low costs. A multi-stage forming process leads to a lower axial compression of the outer tube.

Die Erfindung wird nachfolgend anhand verschiedener Ausführungsformen beschrieben, die in den beigefügten Zeichnungen dargestellt sind. In diesen zeigen:

  • Figur 1 in einer schematischen Draufsicht eine erfindungsgemäße Baugruppe;
  • Figur 2 schematisch einen Schnitt entlang der Ebene II-II von Figur 1;
  • Figur 3 schematisch das Umformen des einem Anschlußrohr zugeordneten Endes eines Außenrohres;
  • die Figuren 4a bis 4c verschiedene Querschnittsformen des einem Anschlußrohr zugeordneten Ende eines Gasführungsrohres bei einem zweistufigen Umformverfahren; und
  • Figur 5 in einer Ansicht entsprechend derjenigen von Figur 2 drei in einem Anschlußrohr aufgenommene Gasführungsrohre.
The invention will be described below with reference to various embodiments, which are illustrated in the accompanying drawings. In these show:
  • FIG. 1 in a schematic plan view of an assembly according to the invention;
  • FIG. 2 schematically a section along the plane II-II of FIG. 1 ;
  • FIG. 3 schematically the forming of a connecting pipe associated end of an outer tube;
  • the FIGS. 4a to 4c various cross-sectional shapes of a connecting pipe associated end of a gas guide tube in a two-stage forming process; and
  • FIG. 5 in a view corresponding to that of FIG. 2 three accommodated in a connecting pipe gas guide tubes.

In Figur 1 sind zwei Gasführungsrohre 5 zu sehen, die an ein Anschlußrohr 7 angeschlossen sind. Die beiden Gasführungsrohre 5 weisen jeweils ein Außenrohr 10 und ein Innenrohr 12 auf. Die Gasführungsrohre dienen insbesondere zur Führung von Abgas einer Verbrennungskraftmaschine und werden auch als luftspaltisolierte Abgasrohre bezeichnet. Das Anschlußrohr 7 ist einschalig ausgebildet. Das Anschlußrohr kann auch zwei- oder mehrschalig ausgeführt sein. Unter Anschlußrohr wird hier auch eine weitere abgasführende Komponente verstanden, beispielsweise der Einlaß- oder Auslaßtrichter eines Katalysators, eine Dieselpartikelfilters, etc. Der besseren Übersichtlichkeit halber sind in allen Zeichnungen die Wandungen der verschiedenen Rohre durch eine einzige Linie symbolisiert, und zwischen aneinander anliegenden Wandungen ist ein Zwischenraum gezeigt, um die einzelnen Bauteile besser voneinander unterscheiden zu können. Auch sind die Distanzhalter, die zwischen dem Außenrohr und dem Innenrohr angeordnet sind, nicht dargestellt.In FIG. 1 two gas guide tubes 5 can be seen, which are connected to a connecting pipe 7. The two gas guide tubes 5 each have a Outer tube 10 and an inner tube 12. The gas guide tubes are used in particular for guiding exhaust gas of an internal combustion engine and are also referred to as air gap insulated exhaust pipes. The connecting pipe 7 is formed as a single shell. The connecting pipe can also be designed with two or more shells. Under connection pipe is understood here as another exhaust-carrying component, for example, the inlet or outlet funnel of a catalyst, a diesel particulate filter, etc. For better clarity, the walls of the various tubes are symbolized by a single line in all drawings, and is between adjacent walls a gap shown to distinguish the individual components better from each other. Also, the spacers which are arranged between the outer tube and the inner tube, not shown.

Zur Verbindung mit dem Anschlußrohr weisen die beiden Gasführungsrohre 5 jeweils besonders geformte Anschlußenden 9 auf, die aneinanderliegend in das Anschlußrohr 7 eingesteckt sind.For connection to the connecting tube, the two gas guide tubes 5 each have specially shaped connecting ends 9, which are inserted into the connecting tube 7 adjacent to one another.

Wie in Figur 2 zu sehen ist, weist das Anschlußrohr 7 an seinem den Gasführungsrohren 5 zugewandten Ende einen Querschnitt auf, der einem Langloch ähnelt. Die Außenrohre 10 der Gasführungsrohre 5 weisen an ihrem dem Anschlußrohr 7 zugewandten Anschlußende jeweils einen D-förmigen Querschnitt auf. Die beiden Querschnitte sind so angeordnet, daß sie Rücken an Rücken liegen. Somit liegen die beiden geraden, vertikalen Abschnitte des "D" aneinander an. Die entsprechenden Ränder können als Verbindungsränder bezeichnet werden, da sie miteinander verschweißt sind. Die Schweißnaht ist mit dem Bezugzeichen 16 angedeutet. Von der Schweißnaht 16 weg erstreckt sich in axialer Richtung eine weitere Schweißnaht 17, die als Kehlnaht zwischen den beiden Außenrohren 10 ausgebildet ist. Diese erstreckt sich bis etwa zum Ende des Anschlußrohres 7. Das Ende des Anschlußrohres 7 ist durch eine umlaufende Schweißnaht 18 mit den Außenrohren 10 verschweißt. Auf diese Weise ist eine insgesamt gasdichte Verbindung zwischen den Gasführungsrohren 5 und dem Anschlußrohr 7 gewährleistet.As in FIG. 2 can be seen, the connecting pipe 7 at its the gas guide tubes 5 facing the end of a cross-section, which is similar to a slot. The outer tubes 10 of the gas guide tubes 5 each have a D-shaped cross section at their connecting end facing the connecting tube 7. The two cross sections are arranged so that they lie back to back. Thus, the two straight, vertical sections of the "D" abut each other. The corresponding edges may be referred to as connection edges because they are welded together. The weld is indicated by the reference numeral 16. From the weld 16 extends in the axial direction another weld 17, which is formed as a fillet weld between the two outer tubes 10. This extends to about the end of the connecting pipe 7. The end of the connecting pipe 7 is welded by a peripheral weld 18 with the outer tubes 10. In this way, a total gas-tight connection between the gas guide tubes 5 and the connecting pipe 7 is ensured.

Anhand der Figuren 3 und 4 wird nun erläutert, wie die Querschnittsform des im Anschlußrohr 7 aufgenommenen Anschlußendes jedes Gasführungsrohres 5 erhalten wird.Based on Figures 3 and 4 will now be explained how the cross-sectional shape of the recorded in the connecting pipe 7 terminal end of each gas guide tube 5 is obtained.

Das Gasführungsrohr wird in ein Werkzeug 20 eingelegt, welches aus einem Oberteil 22 und einem Unterteil 24 besteht. Das Werkzeug ist so ausgelegt, daß es das Außenrohr 10 zuverlässig einspannt. Im Bereich des im Anschlußrohr 7 aufzunehmenden Anschlußendes des Außenrohres 10 weist das Werkzeug 20 eine Ausnehmung auf, deren Form dem Querschnitt des Anschlußendes entspricht. In diesem Bereich wird ein Stempel 26 in das Außenrohr 10 eingedrückt, so daß dieses aufgeweitet und plastisch umgeformt wird. Der Stempel 26 ist ein Hohlstempel mit einer Ausnehmung 28 für das Innenrohr 12. An seinem vorderen Rand ist der Stempel 26 mit zwei Einführkanten 29, 30 versehen, die das Einschieben zwischen das Innenrohr 12 und das Außenrohr 10 erleichtern.The gas guide tube is inserted into a tool 20, which consists of an upper part 22 and a lower part 24. The tool is designed so that it clamps the outer tube 10 reliably. In the area of the terminal end of the outer tube 10 to be received in the connection pipe 7, the tool 20 has a recess whose shape corresponds to the cross section of the connection end. In this area, a punch 26 is pressed into the outer tube 10, so that this is widened and plastically deformed. The punch 26 is a hollow punch with a recess 28 for the inner tube 12. At its front edge of the punch 26 is provided with two insertion edges 29, 30, which facilitate the insertion between the inner tube 12 and the outer tube 10.

Das Umformen des dem Anschlußrohr zugeordneten Endes des Außenrohres 10 kann in einem einzigen Schritt erfolgen, oder, wie in den Figuren 4a bis 4c dargestellt, in mehreren Schritten. In 4a ist das Außenrohr 10 mit dem innerhalb angebrachten Innenrohr 12 zu sehen, wobei sich das Außenrohr 10 im Ausgangszustand befindet. In Figur 4b ist das Gasführungsrohr 5 mit dem in einen Zwischenzustand umgeformten Außenrohr 10 zu sehen. Die Querschnittsform des Außenrohres nähert sich einem "D" an. In Figur 4c ist das Gasführungsrohr mit vollständig umgeformtem Außenrohr 10 zu sehen. Es ist der Verbindungsrand 14 gebildet, der mit dem Verbindungsrand 14 des zweiten Gasführungsrohres 5 verschweißt wird.The forming of the connecting pipe associated end of the outer tube 10 can be done in a single step, or, as in the FIGS. 4a to 4c shown in several steps. 4a, the outer tube 10 is seen with the inner tube 12 mounted inside, wherein the outer tube 10 is in the initial state. In FIG. 4b the gas guide tube 5 can be seen with the outer tube 10 shaped into an intermediate state. The cross-sectional shape of the outer tube approaches a "D". In Figure 4c is the gas guide tube with completely formed outer tube 10 can be seen. It is the connection edge 14 is formed, which is welded to the connection edge 14 of the second gas guide tube 5.

In Figur 5 ist schematisch ein Beispiel gezeigt, wie drei Gasführungsrohre mit einem Anschlußrohr verbunden werden können. Die dem Anschlußrohr 7 zugeordneten Enden der jeweiligen Außenrohre 10 sind so umgeformt, daß sie einen kreissektorförmigen Querschnitt haben. Es ist bei geeigneter Gestaltung der Anschlußenden der Gasführungsrohre auch möglich, mehr als drei Gasführungsrohre mit einem Anschlußrohr zu verbinden.In FIG. 5 schematically is an example shown how three gas guide tubes can be connected to a connecting pipe. The connecting tube 7 associated ends of the respective outer tubes 10 are reshaped so that they have a circular sector-shaped cross-section. It is also possible with suitable design of the terminal ends of the gas guide tubes to connect more than three gas guide tubes with a connecting pipe.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

55
GasführungsrohrGas guide tube
77
Anschlußrohrconnecting tube
99
Anschlußendeterminal end
1010
Außenrohrouter tube
1212
Innenrohrinner tube
1414
Verbindungsrandconnecting edge
1616
SchweißnahtWeld
1717
SchweißnahtWeld
1818
SchweißnahtWeld
2020
WerkzeugTool
2222
Oberteiltop
2424
Unterteillower part
2626
Stempelstamp
2828
Ausnehmungrecess
2929
Einführkantelead-in
3030
Einführkantelead-in

Claims (12)

  1. An assembly, in particular for an exhaust gas system, with at least two double-sheet gas-conducting tubes (5) and a connecting tube (7) which is connected with the outer tubes (10) in a gas-tight manner, so that a transition from the two gas-conducting tubes (5) to the connecting tube (7) is created, wherein at their end associated to the connecting tube (7) the outer tubes (10) each have a connecting edge (14) which is connected with the connecting edge (14) of the adjacent gas-conducting tube (5), wherein the connecting edge is formed integrally with the outer tube, characterized in that the gas-conducting tubes (5) each include an outer tube (10) and an inner tube (12) and the connecting edge (14) is obtained by plastically deforming the outer tube.
  2. The assembly according to claim 1, characterized in that two gas-conducting tubes (5) are accommodated in the connecting tube (7) and the ends of the outer tubes (10) associated to the connecting tube (7) have a D-shaped cross-section.
  3. The assembly according to claim 1, characterized in that three or more gas-conducting tubes (5) are accommodated in the connecting tube (7) and that the ends of the outer tubes (10) facing the connecting tube (7) have a circular-sector-shaped cross-section.
  4. The assembly according to claim 1, characterized in that between the outer tube (10) and the inner tube (12) an air gap is provided.
  5. A method for producing a connecting end of a double-sheet gas-conducting tube (5) formed of an outer tube (10) and an inner tube (12), characterized in that a connecting end of the outer tube (10), to which a connecting tube (7) will be mounted later, is plastically deformed by means of a plunger (26).
  6. The method according to claim 5, characterized in that the inner tube (12) is mounted in the outer tube (10) after the connecting end has been plastically deformed.
  7. The method according to claim 5, characterized in that the inner tube (12) is mounted in the outer tube (10) before the connecting end has been plastically deformed.
  8. The method according to claim 7, characterized in that a hollow plunger (26) is used, which includes a recess (28) for the inner tube (12).
  9. The method according to any of claims 5 to 8, characterized in that the connecting end is deformed into its final shape in a single embossing step.
  10. The method according to any of claims 5 to 8, characterized in that the connecting end is deformed into its final shape in several embossing steps.
  11. The method according to any of claims 5 to 10, characterized in that the outer tube (10) and the inner tube (12) are cut to size before deforming the outer tube (10).
  12. The method according to any of claims 5 to 10, characterized in that the outer tube (10) and the inner tube (12) are cut to size after deforming the outer tube (10).
EP06776544A 2005-08-22 2006-08-01 Subassembly having a plurality of exhaust pipes with air gap insulation and a connecting pipe, and a method of producing a connecting end of an exhaust pipe with air gap insulation Expired - Fee Related EP1920139B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005039639A DE102005039639A1 (en) 2005-08-22 2005-08-22 Assembly having a plurality of air gap insulated exhaust pipes and a connecting pipe, and method for producing a terminal end of an air gap insulated exhaust pipe
PCT/EP2006/007620 WO2007022855A1 (en) 2005-08-22 2006-08-01 Subassembly having a plurality of exhaust pipes with air gap insulation and a connecting pipe, and a method of producing a connecting end of an exhaust pipe with air gap insulation

Publications (2)

Publication Number Publication Date
EP1920139A1 EP1920139A1 (en) 2008-05-14
EP1920139B1 true EP1920139B1 (en) 2010-12-22

Family

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EP06776544A Expired - Fee Related EP1920139B1 (en) 2005-08-22 2006-08-01 Subassembly having a plurality of exhaust pipes with air gap insulation and a connecting pipe, and a method of producing a connecting end of an exhaust pipe with air gap insulation

Country Status (5)

Country Link
EP (1) EP1920139B1 (en)
KR (1) KR101036540B1 (en)
CN (1) CN101243244A (en)
DE (2) DE102005039639A1 (en)
WO (1) WO2007022855A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013109446B4 (en) 2013-08-30 2015-11-26 Benteler Automobiltechnik Gmbh Exhaust manifold with insulation sleeve

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847819A (en) * 1952-11-07 1958-08-19 Gen Motors Corp Reversible exhaust manifold system
DE9205294U1 (en) * 1992-04-16 1992-06-17 Heinrich Gillet GmbH & Co KG, 6732 Edenkoben Exhaust system for motor vehicles
DE19501780C2 (en) * 1994-01-21 1997-08-07 Leistritz Abgastech Pipe-flange connection
JP3279162B2 (en) * 1995-12-26 2002-04-30 トヨタ自動車株式会社 Exhaust manifold structure of exhaust manifold
KR100680896B1 (en) * 1996-03-13 2007-07-06 히다찌 케이블 리미티드 Hose coupling, intermediate blank material for making the same, and hose assembly using same
DE19722725A1 (en) * 1997-05-30 1998-12-03 Zeuna Staerker Kg Pipe merging
DE10228485B4 (en) * 2002-06-26 2012-01-12 J. Eberspächer GmbH & Co. KG pipe arrangement
JP3973987B2 (en) * 2002-07-19 2007-09-12 川崎重工業株式会社 Multi-cylinder engine collective exhaust pipe and small planing boat
FR2848484A3 (en) * 2002-11-13 2004-06-18 Faurecia Sys Echappement Method of assembling exhaust line thin walled metal tubes comprises expanding end of connection tube to form spherical or conical shape, positioning it outside and in contact with exhaust line end connection and welding together
DE10357344A1 (en) * 2003-12-09 2005-07-14 Daimlerchrysler Ag Air gap insulated exhaust pipe, and method for its production

Also Published As

Publication number Publication date
DE502006008568D1 (en) 2011-02-03
KR101036540B1 (en) 2011-05-24
CN101243244A (en) 2008-08-13
WO2007022855A1 (en) 2007-03-01
EP1920139A1 (en) 2008-05-14
KR20080027962A (en) 2008-03-28
DE102005039639A1 (en) 2007-03-01

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