EP3828397B1 - Connecting unit - Google Patents

Connecting unit Download PDF

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Publication number
EP3828397B1
EP3828397B1 EP20203189.4A EP20203189A EP3828397B1 EP 3828397 B1 EP3828397 B1 EP 3828397B1 EP 20203189 A EP20203189 A EP 20203189A EP 3828397 B1 EP3828397 B1 EP 3828397B1
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EP
European Patent Office
Prior art keywords
connection
counter
connection element
pipe
opening
Prior art date
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EP20203189.4A
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German (de)
French (fr)
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EP3828397A1 (en
Inventor
Benjamin Röhr
Elke Preisser
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.)
Eberspaecher Exhaust Technology GmbH and Co KG
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Purem GmbH
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Publication of EP3828397A1 publication Critical patent/EP3828397A1/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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/1855—Mechanical joints the connection being realised by using bolts, screws, rivets or the like
    • 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
    • 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
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing

Definitions

  • connection unit for connecting two exhaust-gas-carrying assemblies of an exhaust system of an internal combustion engine, comprising a ring-disc-like connection element with a connection side to be positioned adjacent to a counter-connection element to be connected to the connection element and a through-opening bordered by an inner peripheral surface of the connection element as well as a connecting pipe inserted into the reach-through opening and extending in the direction of a longitudinal pipe axis.
  • connection units are used in exhaust systems of internal combustion engines in vehicles in order to produce a fixed and essentially exhaust gas-tight connection between different exhaust gas-carrying assemblies.
  • such connecting units are to be produced in the transition area between a so-called "hot end”, i.e. an area of an exhaust system carrying very hot exhaust gases near an internal combustion engine, and a "cold end”, i.e. an area of an exhaust system carrying exhaust gases which have already cooled down somewhat.
  • connection unit is known from JP 2000 136722 A known.
  • a connecting tube partially engaging in a through-opening of a ring-disc-like connecting element has a plurality of circular welding openings following one another in the circumferential direction, which are partially covered by an inner peripheral surface of the through-opening.
  • a weld seam running on the outside of the connecting pipe and along an end face of the connecting element engages in the weld openings from the outside.
  • connection assembly according to the preamble of claim 5 with a connection unit, in which a connection tube is inserted into a passage opening of an annular disk-like Connecting element is used in such a way that this survives on a connecting side of the connecting element.
  • a counter-connection element of the connection assembly to be connected to the connection element with a ring-like sealing element interposed has an opening which, when the connection element and counter-connection element are connected to one another, is opposite the access opening in such a way that the part of the connection pipe protruding on the connection side of the connection element does not engage in it .
  • connection unit for connecting two exhaust gas-carrying assemblies of an exhaust system of an internal combustion engine, which meets the requirements for exhaust gas tightness while being easy to assemble.
  • connection unit is characterized in that the connection tube is connected to the connection element in the area of the inner peripheral surface by welding.
  • the connection pipe can protrude with a centering section on the connection side of the connection element.
  • connection unit Various advantageous aspects are realized in this connection unit.
  • the connection of the connecting element to the connecting tube in the area of the inner peripheral surface of the connecting tube ensures that Production of the welded joint deformations in particular of the connecting element can be largely avoided. Very good gas-tightness is thus achieved when a connection is produced between the connecting element and a counter-connecting element.
  • the aspect of providing a centering section on the connection unit facilitates the assembly of an exhaust system by means of the centering function introduced by means of this centering section with respect to a counter-connection element.
  • the connecting pipe has at least one welding opening that completely penetrates a pipe wall of the connecting pipe in its length region axially overlapped by the inner peripheral surface, and the connecting pipe is formed by a welding opening in the at least one welding opening Welding connected to the connecting element.
  • the connecting tube has a plurality of welded openings that follow one another in the circumferential direction about the longitudinal axis of the tube.
  • At least one, preferably each, weld opening is elongated in the circumferential direction around the longitudinal axis of the pipe.
  • there is a circumferential distance of in the circumferential direction around the longitudinal axis of the pipe successive welding openings is in the range from 2 mm to 6 mm, or/and when an axial width of at least one, preferably each welding opening is in the range from 2 mm to 3 mm.
  • connection assembly for connecting two exhaust-gas-carrying assemblies of an exhaust system of an internal combustion engine according to claim 5.
  • This comprises a connection unit with the structure according to the invention described above and an annular disk-like element to be positioned with a counter-connection side facing the connection element of the connection unit and/or lying against it Counter-connecting element, a centering opening corresponding to the reach-through opening being provided in the counter-connecting element.
  • the connecting assembly can comprise at least one connecting member for firmly connecting the connecting element to the counter-connecting element.
  • the at least one connecting member comprises a connecting bolt that passes through the connecting element and/or the counter-connecting element.
  • the centering function can be provided particularly efficiently in that, when the counter-connection element is connected to the connection element, the reach-through opening and the centering opening are essentially congruent with one another.
  • congruent means that the two openings are provided or arranged with the same opening cross-section geometry, the same opening cross-section size and the same radial positioning with respect to the longitudinal axis of the pipe.
  • the centering section of the connecting tube can engage in the centering opening when the counter-connecting element is connected to the connecting element.
  • the invention further relates to an exhaust system, comprising a connecting assembly constructed according to the invention, a first exhaust-carrying assembly being connected to the connecting pipe and a second exhaust-carrying assembly being connected to the counter-connecting element.
  • FIG. 1 is a partial longitudinal sectional view of an exhaust system for an internal combustion engine in a vehicle.
  • a section of an exhaust system, generally designated 10, for an internal combustion engine of a vehicle can be seen.
  • the 1 the transition between a so-called “hot end” 12 and a so-called “cold end” 14 of the exhaust system 10.
  • two, for example, tubular, exhaust-carrying assemblies 16, 18 of the exhaust system 10 are connected to one another by a connecting assembly 20.
  • connection assembly 20 comprises a connection unit 22 that is preferably connected to the "hotend” 12, i.e. the tubular assembly 16, and a ring-disc-like one that is connected to the connection unit 22 in the manner described below and connected to the "coldend” 14 or the assembly 18 Counter-connector 24.
  • the connecting unit 22 comprises a connecting element 26 to be connected to the counter-connecting element 24.
  • This is also designed in the manner of an annular disk and has a through-opening 28 which is shaped like a circle, for example.
  • a preferably substantially cylindrical connecting pipe 30 extending in the direction of a pipe longitudinal axis L is inserted into the reach-through opening 28 .
  • the outer diameter of the pipe wall 32 of the connecting pipe 30 is matched to the inner diameter of the access opening 28 in such a way that when the connecting pipe 30 is inserted into the access opening 28 , it is accommodated in the access opening 28 essentially without play.
  • the connecting tube 30 in the example shown has a plurality of welding openings 38, preferably designed in the form of slotted holes, which follow one another in the circumferential direction about the longitudinal axis L.
  • These welding openings 38 pass through the pipe wall 32 of the connecting pipe 30 so that basically in the area of the welding openings 38 when the connecting pipe 30 is inserted into the reach-through opening 28 the inner peripheral surface 36 is exposed towards the inside, ie is not covered.
  • a weld 37 is formed in the region of each of the welding openings 38, preferably essentially filling them completely and thus creating a material-locking connection between the connecting tube 30 and the connecting element 26.
  • welds 37 formed in the welding openings 38 can be guided over the webs 39 in the circumferential direction in order to to form welds 41 there as well.
  • the welds 41 running in the area of these webs 39 along the inner peripheral surface of the connecting tube 30 also lead to a material connection between the connecting tube 30 on its outer peripheral surface 34 and the connecting element 26 on its inner peripheral surface 36 due to the heat input that occurs when these welds are produced Circumferentially completely uninterrupted welding between the connecting pipe 30 and the connecting element 26, it is advantageous if the webs 41 have a length of about 2 mm to 6 mm in the circumferential direction. It is also advantageous if the welding openings 38 have an axial width, ie an extent in the direction of the longitudinal axis L of the pipe, in the range of 2 mm to 3 mm.
  • the connecting tube 30 projects beyond the connecting element 26 with a centering section 40 on a connecting side 42 of the connecting element 26 to be positioned facing the counter-connecting element 24 .
  • a centering opening 44 is formed in the counter-connecting element 24 to correspond to the reach-through opening 28 of the connecting element 26 .
  • the connecting pipe 30 engages with its centering section 40 in the centering opening 44 in this way A that the outer peripheral surface 34 of the connecting pipe 30 in the region of the centering section 40 can abut against an inner peripheral surface 48 of the counter-connecting element 24 bordering the centering opening 44, so that a substantially gas-tight connection between the connecting tube 30 and the counter-connecting element 24 is also created in this area.
  • connecting elements 50 preferably designed as screw bolts. These can reach through connecting bolt openings 52 provided in connecting element 26, for example, and can also reach through connecting bolt openings 52 provided in counter-connecting element 24, so that a firm cohesion can be established at the ends protruding beyond counter-connecting element 24, for example by applying nuts or the like.
  • the connecting organ openings 54 in the counter-connecting element 24 can be designed as internally threaded openings into which the connecting organs 50 can be screwed in order to produce a firm connection.
  • the connecting elements 50 press the connecting element 26 with its connecting side 42 or an essentially planar surface provided there against the counter-connecting side 46 or a surface of the counter-connecting element 24 provided there, so that an im Substantial gas-tight connection is achieved. This can be aided by positioning a sealing element between the connection side 42 and the opposite connection side 46 . Since the connection of the connecting pipe 30 to the connecting element 26 is welded in the region of the inner peripheral surface 36 of the connecting element 26, a deformation of the connecting element 26 caused by the heating occurring during welding is practically ruled out. This ensures that this is also provided with high precision in the area of its connection side 42 and thus a gas-tight connection can be guaranteed in contact interaction with the counter-connection element 24 .

Description

Die vorliegende Erfindung betrifft eine Verbindungseinheit zum Verbinden zweier abgasführender Baugruppen einer Abgasanlage einer Brennkraftmaschine, umfassend ein ringscheibenartiges Verbindungselement mit einer einem mit dem Verbindungselement zu verbindenden Gegen-Verbindungselement zugewandt oder/und an diesem anliegend zu positionierenden Verbindungsseite und einer von einer Innenumfangsfläche des Verbindungselements umgrenzten Durchgriffsöffnung sowie ein in die Durchgriffsöffnung eingesetztes, in Richtung einer Rohrlängsachse sich erstreckendes Verbindungsrohr.The present invention relates to a connection unit for connecting two exhaust-gas-carrying assemblies of an exhaust system of an internal combustion engine, comprising a ring-disc-like connection element with a connection side to be positioned adjacent to a counter-connection element to be connected to the connection element and a through-opening bordered by an inner peripheral surface of the connection element as well as a connecting pipe inserted into the reach-through opening and extending in the direction of a longitudinal pipe axis.

In Abgasanlagen von Brennkraftmaschinen in Fahrzeugen werden derartige Verbindungseinheiten eingesetzt, um eine feste und im Wesentlichen abgasdichte Verbindung zwischen verschiedenen abgasführenden Baugruppen herzustellen. Insbesondere werden derartige Verbindungseinheiten im Übergangsbereich zwischen einem sogenannten "Hotend", also einem nahe einer Brennkraftmaschine sehr heiße Abgase führenden Bereich einer Abgasanlage, und einem "Coldend", also einem bereits etwas abgekühlte Abgase führenden Bereich einer Abgasanlage, herzustellen.Such connection units are used in exhaust systems of internal combustion engines in vehicles in order to produce a fixed and essentially exhaust gas-tight connection between different exhaust gas-carrying assemblies. In particular, such connecting units are to be produced in the transition area between a so-called "hot end", i.e. an area of an exhaust system carrying very hot exhaust gases near an internal combustion engine, and a "cold end", i.e. an area of an exhaust system carrying exhaust gases which have already cooled down somewhat.

Eine Verbindungseinheit gemäß dem Oberbegriff des Anspruchs 1 ist aus der JP 2000 136722 A bekannt. Bei dieser bekannten Verbindungseinheit weist ein in eine Durchgriffsöffnung eines ringscheibenartigen Verbindungselements teilweise eingreifendes Verbindungsrohr eine Mehrzahl von in Umfangsrichtung aufeinander folgenden, kreisförmigen Schweißöffnungen auf, die teilweise von einer Innenumfangsfläche der Durchgriffsöffnung überdeckt sind. Eine an der Außenseite des Verbindungsrohrs und entlang einer Stirnseite des Verbindungselements geführte Schweißnaht greift von außen in die Schweißöffnungen ein.A connection unit according to the preamble of claim 1 is known from JP 2000 136722 A known. In this known connecting unit, a connecting tube partially engaging in a through-opening of a ring-disc-like connecting element has a plurality of circular welding openings following one another in the circumferential direction, which are partially covered by an inner peripheral surface of the through-opening. A weld seam running on the outside of the connecting pipe and along an end face of the connecting element engages in the weld openings from the outside.

Aus der US 2005/127670 A1 ist eine Verbindungsbaugruppe gemäß dem Oberbegriff des Anspruchs 5 mit einer Verbindungseinheit bekannt, bei welcher ein Verbindungsrohr in eine Durchgriffsöffnung eines ringscheibenartigen Verbindungselements derart eingesetzt ist, dass dieses an einer Verbindungsseite des Verbindungselements übersteht. Ein mit dem Verbindungselement unter Zwischenlagerung eines ringartigen Dichtungselements zu verbindendes Gegen-Verbindungselement der Verbindungsbaugruppe weist eine Öffnung auf, welche bei miteinander verbundenem Verbindungselement und Gegen-Verbindungselement der Durchgriffsöffnung derart gegenüberliegt, dass der an der Verbindungsseite des Verbindungselements überstehende Teil des Verbindungsrohrs nicht in diese eingreift.From the U.S. 2005/127670 A1 discloses a connection assembly according to the preamble of claim 5 with a connection unit, in which a connection tube is inserted into a passage opening of an annular disk-like Connecting element is used in such a way that this survives on a connecting side of the connecting element. A counter-connection element of the connection assembly to be connected to the connection element with a ring-like sealing element interposed has an opening which, when the connection element and counter-connection element are connected to one another, is opposite the access opening in such a way that the part of the connection pipe protruding on the connection side of the connection element does not engage in it .

Es ist die Aufgabe der vorliegenden Erfindung, eine Verbindungseinheit zum Verbinden zweier abgasführender Baugruppen einer Abgasanlage einer Brennkraftmaschine vorzusehen, welche bei einfacher Montierbarkeit die Anforderungen an die Abgasdichtigkeit erfüllt.It is the object of the present invention to provide a connection unit for connecting two exhaust gas-carrying assemblies of an exhaust system of an internal combustion engine, which meets the requirements for exhaust gas tightness while being easy to assemble.

Erfindungsgemäß wird diese Aufgabe gelöst durch eine Verbindungseinheit zum Verbinden zweier abgasführender Baugruppen einer Abgasanlage einer Brennkraftmaschine gemäß Anspruch 1, umfassend:

  • ein ringscheibenartiges Verbindungselement mit einer einem mit dem Verbindungselement zu verbindenden Gegen-Verbindungselement zugewandt oder/und an diesem anliegend zu positionierenden Verbindungsseite und einer von einer Innenumfangsfläche des Verbindungselements umgrenzten Durchgriffsöffnung,
  • ein in die Durchgriffsöffnung eingesetztes, in Richtung einer Rohrlängsachse sich erstreckendes Verbindungsrohr.
According to the invention, this object is achieved by a connection unit for connecting two exhaust-carrying assemblies of an exhaust system of an internal combustion engine according to claim 1, comprising:
  • an annular disk-like connecting element with a connecting side to be positioned facing and/or adjacent to a counter-connecting element to be connected to the connecting element and a through-opening bordered by an inner peripheral surface of the connecting element,
  • a connecting tube inserted into the reach-through opening and extending in the direction of a longitudinal tube axis.

Die erfindungsgemäße Verbindungseinheit zeichnet sich dadurch aus, dass das Verbindungsrohr mit dem Verbindungselement im Bereich der Innenumfangsfläche durch Verschweißung verbunden ist. Das Verbindungsrohr kann mit einem Zentrierabschnitt an der Verbindungsseite des Verbindungselements überstehen.The connection unit according to the invention is characterized in that the connection tube is connected to the connection element in the area of the inner peripheral surface by welding. The connection pipe can protrude with a centering section on the connection side of the connection element.

In dieser Verbindungseinheit sind verschiedene vorteilhafte Aspekte verwirklicht. Zum einen gewährleistet die Verbindung des Verbindungselements mit dem Verbindungsrohr im Bereich der Innenumfangsfläche des Verbindungsrohrs, dass bei Herstellung der Schweißverbindung Verformungen insbesondere des Verbindungselements weitestgehend vermieden werden können. Damit wird eine sehr gute Gasdichtigkeit bei Erzeugung einer Verbindung zwischen dem Verbindungselement und einem Gegen-Verbindungselement erreicht. Der Aspekt des Bereitstellens eines Zentrierabschnitts an der Verbindungseinheit erleichtert durch die vermittels dieses Zentrierabschnitts eingeführte Zentrierfunktion bezüglich eines Gegen-Verbindungselements den Zusammenbau einer Abgasanlage.Various advantageous aspects are realized in this connection unit. On the one hand, the connection of the connecting element to the connecting tube in the area of the inner peripheral surface of the connecting tube ensures that Production of the welded joint deformations in particular of the connecting element can be largely avoided. Very good gas-tightness is thus achieved when a connection is produced between the connecting element and a counter-connecting element. The aspect of providing a centering section on the connection unit facilitates the assembly of an exhaust system by means of the centering function introduced by means of this centering section with respect to a counter-connection element.

Um die Schweißverbindung zwischen dem Verbindungsrohr und dem Verbindungselement an der Innenumfangsfläche erzeugen zu können, weist das Verbindungsrohr in seinem von der Innenumfangsfläche axial überlappten Längenbereich wenigstens eine eine Rohrwandung des Verbindungsrohrs vollständig durchsetzende Schweißöffnung auf, und das Verbindungsrohr ist durch eine in der wenigstens einen Schweißöffnung gebildete Verschweißung mit dem Verbindungselement verbunden.In order to be able to produce the welded connection between the connecting pipe and the connecting element on the inner peripheral surface, the connecting pipe has at least one welding opening that completely penetrates a pipe wall of the connecting pipe in its length region axially overlapped by the inner peripheral surface, and the connecting pipe is formed by a welding opening in the at least one welding opening Welding connected to the connecting element.

Um dabei über einen möglichst großen Umfangsbereich eine derartige Schweißverbindung bereitstellen zu können, weist das Verbindungsrohr eine Mehrzahl von in Umfangsrichtung um die Rohrlängsachse aufeinanderfolgenden Schweißöffnungen auf.In order to be able to provide such a welded connection over the largest possible circumferential area, the connecting tube has a plurality of welded openings that follow one another in the circumferential direction about the longitudinal axis of the tube.

Um bei derartiger Ausgestaltung auch in Umfangsbereichen zwischen unmittelbar aufeinanderfolgenden Schweißöffnungen einen gasdichten Abschluss zwischen dem Verbindungsrohr und dem Verbindungselement bereitstellen zu können, wird vorgeschlagen, dass im Bereich wenigstens eines, vorzugsweise jedes zwischen zwei in Umfangsrichtung unmittelbar aufeinanderfolgenden Schweißöffnungen gebildeten Steges eine die in diesen Schweißöffnungen gebildeten Verschweißungen in Umfangsrichtung verbindende Verschweißung gebildet ist.In order to be able to provide a gas-tight seal between the connecting pipe and the connecting element in such a configuration, even in peripheral areas between directly consecutive welding openings, it is proposed that in the area of at least one, preferably each, web formed between two welding openings directly following one another in the circumferential direction, one of the webs formed in these welding openings Welds connecting weld is formed in the circumferential direction.

Weiter ist vorteilhaft, wenn wenigstens eine, vorzugsweise jede Schweißöffnung in Umfangsrichtung um die Rohrlängsachse langgestreckt ist. Für die Erzeugung einer stabilen, gleichwohl aber gasdichten Anbindung ist es dabei vorteilhaft, wenn ein Umfangsabstand von in Umfangsrichtung um die Rohrlängsachse unmittelbar aufeinanderfolgenden Schweißöffnungen im Bereich von 2 mm bis 6 mm ist, oder/und wenn eine axiale Breite wenigstens einer, vorzugsweise jeder Schweißöffnung im Bereich von 2 mm bis 3 mm ist.It is also advantageous if at least one, preferably each, weld opening is elongated in the circumferential direction around the longitudinal axis of the pipe. In order to create a stable, but nevertheless gas-tight connection, it is advantageous if there is a circumferential distance of in the circumferential direction around the longitudinal axis of the pipe successive welding openings is in the range from 2 mm to 6 mm, or/and when an axial width of at least one, preferably each welding opening is in the range from 2 mm to 3 mm.

Die Erfindung betrifft ferner eine Verbindungsbaugruppe zum Verbinden zweier abgasführender Baugruppen einer Abgasanlage einer Brennkraftmaschine gemäß Anspruch 5. Diese umfasst eine Verbindungseinheit mit dem vorangehend beschriebenen, erfindungsgemäßen Aufbau und ein mit einer Gegen-Verbindungsseite dem Verbindungselement der Verbindungseinheit zugewandt oder/und daran anliegend zu positionierendes ringscheibenartiges Gegen-Verbindungselement, wobei in dem Gegen-Verbindungselement eine der Durchgriffsöffnung entsprechende Zentrieröffnung vorgesehen ist.The invention also relates to a connection assembly for connecting two exhaust-gas-carrying assemblies of an exhaust system of an internal combustion engine according to claim 5. This comprises a connection unit with the structure according to the invention described above and an annular disk-like element to be positioned with a counter-connection side facing the connection element of the connection unit and/or lying against it Counter-connecting element, a centering opening corresponding to the reach-through opening being provided in the counter-connecting element.

Um dabei eine feste Verbindung zwischen dem Verbindungselement und dem Gegen-Verbindungselement bereitstellen zu können, kann die Verbindungsbaugruppe wenigstens ein Verbindungsorgan zum festen Verbinden des Verbindungselements mit dem Gegen-Verbindungselement umfassen.In order to be able to provide a fixed connection between the connecting element and the counter-connecting element, the connecting assembly can comprise at least one connecting member for firmly connecting the connecting element to the counter-connecting element.

Für eine besonders einfach herzustellende, gleichwohl jedoch stabile Verbindung wird vorgeschlagen, dass das wenigstens eine Verbindungsorgan einen das Verbindungselement oder/und das Gegen-Verbindungselement durchgreifenden Verbindungsbolzen umfasst.For a connection that is particularly easy to produce but is nevertheless stable, it is proposed that the at least one connecting member comprises a connecting bolt that passes through the connecting element and/or the counter-connecting element.

Die Zentrierfunktion kann dadurch besonders effizient bereitgestellt werden, dass bei mit dem Verbindungselement verbundenem Gegen-Verbindungselement die Durchgriffsöffnung und die Zentrieröffnung zueinander im Wesentlichen deckungsgleich sind. Deckungsgleich bedeutet im Sinne der vorliegenden Erfindung, dass die beiden Öffnungen mit gleicher Öffnungsquerschnittsgeometrie, gleicher Öffnungsquerschnittsgröße und bezüglich der Rohrlängsachse gleicher radialer Positionierung bereitgestellt bzw. angeordnet sind.The centering function can be provided particularly efficiently in that, when the counter-connection element is connected to the connection element, the reach-through opening and the centering opening are essentially congruent with one another. In the context of the present invention, congruent means that the two openings are provided or arranged with the same opening cross-section geometry, the same opening cross-section size and the same radial positioning with respect to the longitudinal axis of the pipe.

Zum Zentrieren des Verbindungselements bezüglich des Gegen-Verbindungselements kann bei mit dem Verbindungselement verbundenem Gegen-Verbindungselement der Zentrierabschnitt des Verbindungsrohrs in die Zentrieröffnung eingreifen.In order to center the connecting element with respect to the counter-connecting element, the centering section of the connecting tube can engage in the centering opening when the counter-connecting element is connected to the connecting element.

Die Erfindung betrifft ferner eine Abgasanlage, umfassend eine erfindungsgemäß aufgebaute Verbindungsbaugruppe, wobei mit dem Verbindungsrohr eine erste abgasführende Baugruppe verbunden ist und mit dem Gegen-Verbindungselement eine zweite abgasführende Baugruppe verbunden ist.The invention further relates to an exhaust system, comprising a connecting assembly constructed according to the invention, a first exhaust-carrying assembly being connected to the connecting pipe and a second exhaust-carrying assembly being connected to the counter-connecting element.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegende Figur 1 detailliert beschrieben, welche eine Teil-Längsschnittdarstellung einer Abgasanlage für eine Brennkraftmaschine in einem Fahrzeug darstellt.The present invention is hereinafter described with reference to the attached figure 1 described in detail, which is a partial longitudinal sectional view of an exhaust system for an internal combustion engine in a vehicle.

In Fig. 1 ist ein Ausschnitt einer allgemein mit 10 bezeichneten Abgasanlage für eine Brennkraftmaschine eines Fahrzeugs zu erkennen. Insbesondere zeigt die Fig. 1 den Übergang zwischen einem so genannten "Hotend" 12 und einem so genannten "Coldend" 14 der Abgasanlage 10. In diesem Bereich sind zwei beispielsweise rohrartige abgasführende Baugruppen 16, 18 der Abgasanlage 10 durch eine Verbindungsbaugruppe 20 miteinander verbunden.In 1 a section of an exhaust system, generally designated 10, for an internal combustion engine of a vehicle can be seen. In particular, the 1 the transition between a so-called "hot end" 12 and a so-called "cold end" 14 of the exhaust system 10. In this area, two, for example, tubular, exhaust-carrying assemblies 16, 18 of the exhaust system 10 are connected to one another by a connecting assembly 20.

Die Verbindungsbaugruppe 20 umfasst eine vorzugsweise an das "Hotend" 12, also die rohrartige Baugruppe 16, angebundene Verbindungseinheit 22 und ein mit der Verbindungseinheit 22 in nachfolgend beschriebener Art und Weise verbundenes und an das "Coldend" 14 bzw. die Baugruppe 18 angebundenes, ringscheibenartiges Gegen-Verbindungselement 24.The connection assembly 20 comprises a connection unit 22 that is preferably connected to the "hotend" 12, i.e. the tubular assembly 16, and a ring-disc-like one that is connected to the connection unit 22 in the manner described below and connected to the "coldend" 14 or the assembly 18 Counter-connector 24.

Die Verbindungseinheit 22 umfasst ein mit dem Gegen-Verbindungselement 24 zu verbindendes Verbindungselement 26. Auch dieses ist ringscheibenartig ausgebildet und weist eine beispielsweise kreisartig geformte Durchgriffsöffnung 28 auf. In die Durchgriffsöffnung 28 ist ein in Richtung einer Rohrlängsachse L sich erstreckendes, vorzugsweise im Wesentlichen zylindrisch ausgebildetes Verbindungsrohr 30 eingesetzt. Dabei ist das Verbindungsrohr 30 mit einem Außendurchmesser seiner Rohrwandung 32 auf den Innendurchmesser der Durchgriffsöffnung 28 derart abgestimmt, dass bei in die Durchgriffsöffnung 28 eingesetztem Verbindungsrohr 30 dieses im Wesentlichen spielfrei in der Durchgriffsöffnung 28 aufgenommen ist. In dem von der Innenumfangsfläche 36 axial überlappten Längenbereich weist das Verbindungsrohr 30 im dargestellten Beispiel eine Mehrzahl von in Umfangsrichtung um die Längsachse L aufeinanderfolgenden, vorzugsweise langlochartig ausgebildeten Schweißöffnungen 38 auf. Diese Schweißöffnungen 38 durchsetzen die Rohrwandung 32 des Verbindungsrohrs 30, so dass grundsätzlich im Bereich der Schweißöffnungen 38 bei in die Durchgriffsöffnung 28 eingesetztem Verbindungsrohr 30 die Innenumfangsfläche 36 nach innen hin frei liegt, also nicht überdeckt ist.The connecting unit 22 comprises a connecting element 26 to be connected to the counter-connecting element 24. This is also designed in the manner of an annular disk and has a through-opening 28 which is shaped like a circle, for example. A preferably substantially cylindrical connecting pipe 30 extending in the direction of a pipe longitudinal axis L is inserted into the reach-through opening 28 . The outer diameter of the pipe wall 32 of the connecting pipe 30 is matched to the inner diameter of the access opening 28 in such a way that when the connecting pipe 30 is inserted into the access opening 28 , it is accommodated in the access opening 28 essentially without play. In the length region axially overlapped by the inner peripheral surface 36, the connecting tube 30 in the example shown has a plurality of welding openings 38, preferably designed in the form of slotted holes, which follow one another in the circumferential direction about the longitudinal axis L. These welding openings 38 pass through the pipe wall 32 of the connecting pipe 30 so that basically in the area of the welding openings 38 when the connecting pipe 30 is inserted into the reach-through opening 28 the inner peripheral surface 36 is exposed towards the inside, ie is not covered.

Zur Herstellung einer festen Verbindung zwischen dem Verbindungsrohr 30 und dem Verbindungselement 26 wird im Bereich jeder der Schweißöffnungen 38 eine diese vorzugsweise im Wesentlichen vollständig ausfüllende und damit eine materialschlüssige Verbindung des Verbindungsrohrs 30 mit dem Verbindungselement 26 herstellende Verschweißung 37 gebildet. Durch diese Verschweißungen 37 bezüglich der Innenumfangsfläche 36 des Verbindungselements 26 wird eine in Umfangsrichtung nahezu vollständig durchgehende, und somit im Wesentlichen gasdichte materialschlüssige Anbindung des Verbindungselements 26 an das Verbindungsrohr 30 gewährleistet. Um auch im Bereich der in Umfangsrichtung zwischen unmittelbar aufeinander folgenden Schweißöffnungen 38 gebildeten Stege 39 einen gasdichten Anschluss zwischen dem Verbindungsrohr 30 und dem Verbindungselement 26 zu erreichen, können die in den Schweißöffnungen 38 beispielsweise durch ein WIG- Schweißverfahren oder ein MAG- Schweißverfahren gebildeten Verschweißungen 37 über die Stege 39 in Umfangsrichtung hinweg geführt werden, um auch dort Verschweißungen 41 zu bilden. Auch die im Bereich dieser Stege 39 entlang der Innenumfangsfläche des Verbindungsrohrs 30 geführten Verschweißungen 41 führen durch den beim Erzeugen dieser Verschweißungen auftretenden Wärmeeintrag zu einem Materialschluss zwischen dem Verbindungsrohr 30 an seiner Außenumfangsfläche 34 und dem Verbindungselement 26 an seiner Innenumfangsfläche 36. Zum Erzeugen einer derartigen in Umfangsrichtung vollständig unterbrechungsfreien Verschweißung zwischen dem Verbindungsrohr 30 und dem Verbindungselement 26 ist es vorteilhaft, wenn die Stege 41 in Umfangsrichtung einen Länge von etwa 2 mm bis 6 mm aufweisen. Auch ist es vorteilhaft, wenn die Schweißöffnungen 38 eine axiale Breite, also eine Ausdehnung in Richtung der Rohrlängsachse L, im Bereich von 2 mm bis 3 mm aufweisen.In order to establish a firm connection between the connecting tube 30 and the connecting element 26, a weld 37 is formed in the region of each of the welding openings 38, preferably essentially filling them completely and thus creating a material-locking connection between the connecting tube 30 and the connecting element 26. These welds 37 with respect to the inner peripheral surface 36 of the connecting element 26 ensure that the connecting element 26 is connected to the connecting pipe 30 in a material-locking manner that is almost completely continuous in the circumferential direction and is therefore essentially gas-tight. To also in the area of circumferentially between directly consecutive Webs 39 formed by welding openings 38 to achieve a gas-tight connection between the connecting pipe 30 and the connecting element 26, the welds 37 formed in the welding openings 38, for example by a TIG welding process or a MAG welding process, can be guided over the webs 39 in the circumferential direction in order to to form welds 41 there as well. The welds 41 running in the area of these webs 39 along the inner peripheral surface of the connecting tube 30 also lead to a material connection between the connecting tube 30 on its outer peripheral surface 34 and the connecting element 26 on its inner peripheral surface 36 due to the heat input that occurs when these welds are produced Circumferentially completely uninterrupted welding between the connecting pipe 30 and the connecting element 26, it is advantageous if the webs 41 have a length of about 2 mm to 6 mm in the circumferential direction. It is also advantageous if the welding openings 38 have an axial width, ie an extent in the direction of the longitudinal axis L of the pipe, in the range of 2 mm to 3 mm.

Das Verbindungsrohr 30 steht mit einem Zentrierabschnitt 40 an einer dem Gegenverbindungselement 24 zugewandt zu positionierenden Verbindungsseite 42 des Verbindungselements 26 über das Verbindungselement 26 über. In Entsprechung zur Durchgriffsöffnung 28 des Verbindungselements 26 ist im Gegen-Verbindungselement 24 eine Zentrieröffnung 44 gebildet. Bei mit einer Gegen-Verbindungsseite 46 an der Verbindungsseite 42 des Verbindungselements 26 anliegendem Gegen-Verbindungselement 24 greift der Zentrierabschnitt 40 in die Zentrieröffnung 44 ein und gewährleistet somit eine definierte Positionierung des Gegen-Verbindungselements 24 bezüglich des Verbindungselements 26. Da die Durchgriffsöffnung 28 und die Zentrieröffnung 24 bei aneinander anliegendem Verbindungselement 26 und Gegen-Verbindungselement 24 im Wesentlichen deckungsgleich sind, also aufgrund gleicher Querschnittsgeometrie, gleicher Querschnittsabmessung und gleicher Positionierung bezüglich der Rohrlängsachse A einander im Wesentlichen stufenfrei fortsetzen, greift das Verbindungsrohr 30 mit seinem Zentrierabschnitt 40 derart in die Zentrieröffnung 44 ein, dass die Außenumfangsfläche 34 des Verbindungsrohrs 30 im Bereich des Zentrierabschnitts 40 an einer die Zentrieröffnung 44 umgrenzenden Innenumfangsfläche 48 des Gegen-Verbindungselements 24 anliegen kann, so dass auch in diesem Bereich eine im Wesentlichen gasdichte Verbindung zwischen dem Verbindungsrohr 30 und dem Gegen-Verbindungselement 24 entsteht.The connecting tube 30 projects beyond the connecting element 26 with a centering section 40 on a connecting side 42 of the connecting element 26 to be positioned facing the counter-connecting element 24 . A centering opening 44 is formed in the counter-connecting element 24 to correspond to the reach-through opening 28 of the connecting element 26 . When a counter-connection side 46 rests against the connection side 42 of the connecting element 26, the counter-connecting element 24 engages the centering section 40 in the centering opening 44 and thus ensures a defined positioning of the counter-connecting element 24 with respect to the connecting element 26. Since the through-opening 28 and the If centering opening 24 is essentially congruent when connecting element 26 and counter-connecting element 24 are in contact, i.e. they continue one another essentially steplessly due to the same cross-sectional geometry, the same cross-sectional dimensions and the same positioning with respect to the longitudinal axis A of the pipe, the connecting pipe 30 engages with its centering section 40 in the centering opening 44 in this way A that the outer peripheral surface 34 of the connecting pipe 30 in the region of the centering section 40 can abut against an inner peripheral surface 48 of the counter-connecting element 24 bordering the centering opening 44, so that a substantially gas-tight connection between the connecting tube 30 and the counter-connecting element 24 is also created in this area.

Zur Herstellung einer festen Verbindung zwischen dem Verbindungselement 26 und dem Gegen-Verbindungselement 24 sind mehrere vorzugsweise als Schraubenbolzen ausgeführte Verbindungsorgane 50 vorgesehen. Diese können beispielsweise im Verbindungselement 26 vorgesehene Verbindungsbolzenöffnungen 52 durchgreifen und können auch im Gegen-Verbindungselement 24 vorgesehene Verbindungsbolzenöffnungen 52 durchgreifen, so dass an dem über das Gegen-Verbindungselement 24 überstehenden Enden beispielsweise durch Aufbringen von Muttern oder dergleichen, ein fester Zusammenhalt hergestellt werden kann. Alternativ können beispielsweise die Verbindungsorganöffnungen 54 im Gegen-Verbindungselement 24 als Innengewindeöffnungen ausgebildet sein, in welche zur Herstellung eines festen Anschlusses die Verbindungsorgane 50 eingeschraubt werden können.In order to establish a firm connection between the connecting element 26 and the counter-connecting element 24, a plurality of connecting elements 50, preferably designed as screw bolts, are provided. These can reach through connecting bolt openings 52 provided in connecting element 26, for example, and can also reach through connecting bolt openings 52 provided in counter-connecting element 24, so that a firm cohesion can be established at the ends protruding beyond counter-connecting element 24, for example by applying nuts or the like. Alternatively, for example, the connecting organ openings 54 in the counter-connecting element 24 can be designed as internally threaded openings into which the connecting organs 50 can be screwed in order to produce a firm connection.

Durch die Verbindungsorgane 50 wird das Verbindungselement 26 mit seiner Verbindungsseite 42 bzw. einer dort vorgesehenen, im Wesentlichen planen Oberfläche, gegen die Gegen-Verbindungsseite 46 bzw. eine dort vorgesehene Oberfläche des Gegen-Verbindungselements 24 gepresst, so dass auch in diesem Bereich ein im Wesentlicher gasdichter Anschluss erzielt wird. Dieser kann durch das Positionieren eines Dichtungselements zwischen der Verbindungsseite 42 und der Gegen-Verbindungsseite 46 unterstützt werden. Da bei der Anbindung des Verbindungsrohrs 30 an das Verbindungselement 26 die Verschweißung im Bereich der Innenumfangsfläche 36 des Verbindungselements 26 erfolgt, wird eine durch die beim Verschweißen auftretende Erwärmung indizierte Verformung des Verbindungselements 26 praktisch ausgeschlossen. Dies stellt sicher, dass dieses mit hoher Präzision auch im Bereich seiner Verbindungsseite 42 bereitgestellt wird und somit in Anlagewechselwirkung mit dem Gegen-Verbindungsorgan 24 ein gasdichter Anschluss gewährleistet werden kann.The connecting elements 50 press the connecting element 26 with its connecting side 42 or an essentially planar surface provided there against the counter-connecting side 46 or a surface of the counter-connecting element 24 provided there, so that an im Substantial gas-tight connection is achieved. This can be aided by positioning a sealing element between the connection side 42 and the opposite connection side 46 . Since the connection of the connecting pipe 30 to the connecting element 26 is welded in the region of the inner peripheral surface 36 of the connecting element 26, a deformation of the connecting element 26 caused by the heating occurring during welding is practically ruled out. This ensures that this is also provided with high precision in the area of its connection side 42 and thus a gas-tight connection can be guaranteed in contact interaction with the counter-connection element 24 .

Claims (10)

  1. Connection unit for connecting two exhaust gas-carrying assembly units of an exhaust system of an internal combustion engine, comprising:
    - a ring washer-like connection element (26) with a connection side (42) to be positioned such that it faces a counter-connection element (24) to be connected to the connection element (26) or/and is in contact with it and with a passage opening (28) bordered by an inner circumferential surface (36) of the connection element (26), and
    - a connection pipe (30), which is inserted into the passage opening (28) and extends in the direction of a pipe longitudinal axis (L),
    wherein the connection pipe (30) is connected to the connection element (26) in the area of the inner circumferential surface (36) by welding, characterized in that the connection pipe (30) comprises in its length area axially overlapped by the inner circumferential surface (36) a plurality of weld openings (38) elongated in the circumferential direction and succeeding each other about the pipe longitudinal axis (L), passing completely through a pipe wall (32) of the connection pipe (30), and that the connection pipe (30) is connected to the connection element (26) by a weld seam (37) formed in the at least one weld opening (38).
  2. Connection unit according to claim 1, characterized in that the connection pipe (30) projects with a centering section (40) at the connection side (42) of the connection element (26).
  3. Connection unit in accordance with claim 1 or 2, characterized in that a weld seam (41) connecting the weld seams (37) formed in the weld openings (38) in the circumferential direction is formed beyond the web (39) in the circumferential direction (39) along the inner circumferential surface (36) in the area of at least one and preferably each web (39) formed between two said weld openings (38) following each other directly in the circumferential direction.
  4. Connection unit in accordance with one of the claims 1-3, characterized in that a circumferential distance of weld openings (38) following one another directly in the circumferential direction about the pipe longitudinal axis (L) is in the range of 2 mm to 6 mm, or/and that an axial width of at least one and preferably each weld opening (38) is in the range of 2 mm to 3 mm.
  5. Connection assembly unit for connecting two exhaust gas-carrying assembly units (16, 18) of an exhaust system of an internal combustion engine, comprising a ring washer-like connection unit (22) in accordance with one of the preceding claims and a counter-connection element (24), which is to be positioned such that it faces the connection element (26) of the connection unit (22) with a counter-connection side (46) or/and is in contact therewith, wherein a centering opening (44) corresponding to the passage opening (28) is provided in the counter-connection element (24).
  6. Connection assembly unit in accordance with claim 5, characterized by at least one connection member (50) for permanently connecting the connection element (26) to the counter-connection element (24).
  7. Connection assembly unit in accordance with claim 6, characterized in that the at least one connection member (50) comprises a connection bolt passing through the connection element (26) or/and through the counter-connection element (24).
  8. Connection assembly unit in accordance with one of the claims 5-7, characterized in that when the counter-connection element (24) is connected to the connection element (26), the passage opening (28) and the centering opening (44) are essentially congruent with one another.
  9. Connection assembly unit in accordance with one of the claims 5-8, if referring back to claim 2, characterized in that when the counter-connection element (24) is connected to the connection element (26), the centering section (40) of the connection pipe (30) meshes with the centering opening (44).
  10. Exhaust system, comprising a connection assembly unit (20) in accordance with one of the claims 5-9, wherein a first exhaust gas-carrying assembly unit (16) is connected to the connection pipe (30) and a second exhaust gas-carrying assembly unit (18) is connected to the counter-connection element (24).
EP20203189.4A 2019-11-26 2020-10-22 Connecting unit Active EP3828397B1 (en)

Applications Claiming Priority (1)

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DE102019131891.2A DE102019131891A1 (en) 2019-11-26 2019-11-26 Connection unit

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EP3828397B1 true EP3828397B1 (en) 2023-09-06

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2623876B2 (en) * 1989-12-18 1997-06-25 日産自動車株式会社 Exhaust system connection device
EP0759502B2 (en) 1995-08-16 2003-03-26 Benteler Ag Compensating system
JP2000136722A (en) * 1998-11-02 2000-05-16 Yutaka Giken Co Ltd Double exhaust pipe
JP3680993B2 (en) 2001-05-14 2005-08-10 本田技研工業株式会社 Exhaust manifold assembly connection structure for multi-cylinder internal combustion engines
DE10158877A1 (en) * 2001-11-30 2003-06-12 Iwka Balg Und Kompensatoren Te Method and device for connecting parts of an exhaust system
DE102014103314B4 (en) 2014-03-12 2018-07-12 Tenneco Gmbh Exhaust pipe flange, group flange and exhaust system
JP6743803B2 (en) * 2017-12-19 2020-08-19 株式会社豊田自動織機 Exhaust gas purification device
CN109209594A (en) * 2018-11-16 2019-01-15 十堰楚欣达汽车科技股份有限公司 A kind of novel commercial vehicle exhaust port

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CN112943435A (en) 2021-06-11
DE102019131891A1 (en) 2021-05-27
US11725568B2 (en) 2023-08-15
EP3828397A1 (en) 2021-06-02
US20210156293A1 (en) 2021-05-27

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