EP0789137A2 - Exhaust pipe - Google Patents
Exhaust pipe Download PDFInfo
- Publication number
- EP0789137A2 EP0789137A2 EP97101684A EP97101684A EP0789137A2 EP 0789137 A2 EP0789137 A2 EP 0789137A2 EP 97101684 A EP97101684 A EP 97101684A EP 97101684 A EP97101684 A EP 97101684A EP 0789137 A2 EP0789137 A2 EP 0789137A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- outer tube
- exhaust pipe
- expansion
- pipe
- compensator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- 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
- F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
- F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
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- 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
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- 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
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- 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
- F01N13/1883—Construction facilitating manufacture, assembly, or disassembly manufactured by hydroforming
Definitions
- the invention relates to an exhaust pipe according to the features in the preamble of claim 1.
- Double-walled exhaust pipes are used in the exhaust gas routing from the internal combustion engine of an automobile to a catalytic converter integrated in the exhaust system and / or an engine supercharger.
- the heat losses of the exhaust gas up to the catalytic converter or the engine supercharging are kept low, which on the one hand causes the catalytic converter to respond quickly and on the other hand increases the enthalpy available for engine supercharging.
- Air-gap-insulated exhaust pipes allow the gas-carrying inner pipe to be decoupled from the outer pipe, which absorbs the external and external forces. External forces result, among other things, from vibrations. At The internal forces include the thermal expansion of the outer tube. Compensation arrangements are required for this.
- DE 39 25 802 A1 discloses a sliding seat construction for the inner gas-carrying pipe. This allows the inner tube to expand without being damaged.
- an expansion compensator belongs to the prior art, in which two pipe sections are connected to one another by a flexible bridge member in the form of a corrugated pipe.
- the cylindrical ends of the corrugated pipe are welded to the circumference of the ends of the pipe sections.
- expansion compensators on the outer tube of a double-walled exhaust pipe, however, is associated with not inconsiderable additional manufacturing costs and costs.
- quality of the exhaust pipe is also deteriorated due to the welding specification.
- expansion compensators can often not be placed at the location of the greatest thermal stresses occurring and then only fulfill their task to a limited extent.
- the invention is based on the object of creating an exhaust pipe which is improved in its functionality and which is simple and lightweight construction is insensitive to operational tensions.
- the expansion compensator is then formed by hydraulic bellows-like deformation of the wall of the outer tube. This is done using the hydraulic high pressure process.
- the outer tube thus forms a one-piece molded part with an integrated expansion compensator without additional welded connections for fixing the expansion compensator.
- several expansion compensators can also be provided.
- the number of individual compensation beads in an expansion compensator is tailored to the respective application. Therefore, several expansion compensators can be present in an exhaust pipe, which have a different number of compensation beads.
- the expansion compensators are configured and positioned in such a way that component stresses are reduced.
- the hydraulic internal high-pressure forming enables the exhaust pipe to be manufactured economically and economically, in particular from the point that the exhaust pipes are mass-produced items that are mass-produced.
- the hydraulic forming also enables high dimensional accuracy with the smallest manufacturing tolerances.
- the exhaust pipe according to the invention is characterized by its high inherent rigidity, its weight being reduced by the omission of separate expansion compensators.
- One or more expansion compensators can be provided in an exhaust pipe.
- the wall of the outer tube is expediently shaped after the inner tube has been fitted in and, if appropriate, the bending process has been carried out.
- the insulating annular air gap is then formed by hydraulic expansion of the outer tube. This is usually done by first pushing a straight inner tube and a straight outer tube into one another and connecting them at their end regions. They are then bent together, with a bending mandrel being guided in the inner tube.
- the resulting pipe elbow is then bent into a calibration form that corresponds to the target contour of the outer pipe introduced and the ends of the outer tube sealed pressure-tight.
- a hydraulic pressure medium is then pressed into the space formed between the inner tube and the outer tube and into the inner tube at such a high pressure that the outer tube rests against the wall of the calibration mold and the desired contour of the outer tube is created. Since the pressure in the space between the inner and outer tubes and inside the inner tube is the same, the predetermined shape of the inner tube remains unaffected.
- the features of claim 3 result in a high stability of the exhaust pipe, since the expansion compensators are each positioned in an area where it is ensured that the operationally occurring tensions are reduced.
- the positioning is matched to the respective design of the exhaust pipe in accordance with the component. This effectively compensates for the thermal expansion and forces arising from load change excitations during operation.
- the exhaust pipe according to the invention is characterized by the highest mechanical resilience with great geometric freedom. Another advantage is that not only weight is saved in the expansion compensators themselves, but also a reduction in the wall thickness of the outer tube is possible. This is associated with additional weight savings. Inexpensive materials can also be used than previously.
- a section of a double-walled elbow 1 is shown in perspective in FIG.
- An inner tube 2 is arranged in an outer tube 3 to form an annular air gap 4.
- the constrictions 5, 6 in the end regions 7 and 8 of the pipe bend 1 fix the inner pipe 2 in its radial position in the outer pipe 3.
- expansion compensators 9, 10 are arranged in the outer tube 3.
- the expansion compensators 9, 10 are formed by hydraulic bellows-like deformation of the wall 11 of the outer tube 3. This creates 11 balancing shafts 12 in the wall, which absorb the thermally induced changes in length.
- the balancer shafts 12 are provided in the areas 13, 14 in which the greatest thermal stress can be expected during operation or where their use achieves the most effective voltage equalization.
Abstract
Description
Die Erfindung betrifft eine Abgasleitung gemäß den Merkmalen im Oberbegriff des Anspruchs 1.The invention relates to an exhaust pipe according to the features in the preamble of claim 1.
Bei der Abgasführung von dem Verbrennungsmotor eines Automobils zu einem in die Abgasanlage integrierten Katalysator und/oder einer Motoraufladung werden doppelwandige Abgasleitungen eingesetzt. Hierdurch werden die Wärmeverluste des Abgases bis zum Katalysator bzw. der Motoraufladung gering gehalten, was einerseits ein schnelles Ansprechen des Katalysators bewirkt und andererseits die zur Motoraufladung zur Verfügung stehende Enthalpie erhöht.Double-walled exhaust pipes are used in the exhaust gas routing from the internal combustion engine of an automobile to a catalytic converter integrated in the exhaust system and / or an engine supercharger. As a result, the heat losses of the exhaust gas up to the catalytic converter or the engine supercharging are kept low, which on the one hand causes the catalytic converter to respond quickly and on the other hand increases the enthalpy available for engine supercharging.
Luftspaltisolierte Abgasleitungen erlauben eine Entkopplung des gasführenden Innenrohrs von dem die äußeren sowie inneren Kräfte aufnehmenden Außenrohr. Äußere Kräfte resultieren unter anderem als Folge von Schwingungen. Bei den inneren Kräften ist unter anderem die Wärmeausdehnung des äußeren Rohrs aufzunehmen. Hierzu sind Ausgleichsanordnungen erforderlich.Air-gap-insulated exhaust pipes allow the gas-carrying inner pipe to be decoupled from the outer pipe, which absorbs the external and external forces. External forces result, among other things, from vibrations. At The internal forces include the thermal expansion of the outer tube. Compensation arrangements are required for this.
Aus der DE 39 25 802 A1 ist beispielsweise eine Schiebesitzkonstruktion für das innere gasführende Rohr bekannt. Das Innenrohr kann sich so ausdehnen, ohne Schaden zu nehmen.DE 39 25 802 A1, for example, discloses a sliding seat construction for the inner gas-carrying pipe. This allows the inner tube to expand without being damaged.
Diese gasdurchlässigen Schiebesitze sind in der Regel am Außenrohr nicht einsetzbar. Demzufolge kommen hier gesonderte Ausgleichsgelenke bzw. Dehnungsausgleicher zum Einsatz.As a rule, these gas-permeable sliding seats cannot be used on the outer tube. As a result, separate compensating joints or expansion compensators are used here.
In diesem Zusammenhang zählt ein Dehnungsausgleicher zum Stand der Technik, bei welchem zwei Rohrabschnitte durch ein flexibles Brückenglied in Form eines Wellrohrs miteinander verbunden sind. Die zylindrischen Enden des Wellrohrs werden umfangsseitig der Enden der Rohrabschnitte verschweißt.In this context, an expansion compensator belongs to the prior art, in which two pipe sections are connected to one another by a flexible bridge member in the form of a corrugated pipe. The cylindrical ends of the corrugated pipe are welded to the circumference of the ends of the pipe sections.
Der Einsatz derartiger Dehnungsausgleicher am Außenrohr einer doppelwandigen Abgasleitung ist jedoch mit nicht unerheblichen fertigungstechnischen und kostenmäßigen Mehraufwendungen verbunden. Auch wird durch die schweißtechnische Festlegung die Qualität der Abgasleitung verschlechtert. Neben dem zusätzlichen Gewicht durch die Dehnungsausgleicher ist weiterhin nachteilig, daß die Dehnungsausgleicher häufig nicht am Ort der größten auftretenden Wärmespannungen plaziert werden können und dann ihre Aufgabe nur bedingt erfüllen.The use of such expansion compensators on the outer tube of a double-walled exhaust pipe, however, is associated with not inconsiderable additional manufacturing costs and costs. The quality of the exhaust pipe is also deteriorated due to the welding specification. In addition to the additional weight due to the expansion compensators, it is also disadvantageous that the expansion compensators can often not be placed at the location of the greatest thermal stresses occurring and then only fulfill their task to a limited extent.
Der Erfindung liegt ausgehend vom Stand der Technik die Aufgabe zugrunde, eine in ihrer Funktionalität verbesserte Abgasleitung zu schaffen, die bei einfacher und leicht bauender Ausbildung unempfindlich gegenüber betriebstechnischen Spannungen ist.Starting from the prior art, the invention is based on the object of creating an exhaust pipe which is improved in its functionality and which is simple and lightweight construction is insensitive to operational tensions.
Die Lösung dieser Aufgabe besteht nach der Erfindung in den im kennzeichnenden Teil des Anspruchs 1 aufgeführten Merkmalen.This object is achieved according to the invention in the features listed in the characterizing part of claim 1.
Danach ist der Dehnungsausgleicher durch hydraulische balgartige Umformformung der Wandung des Außenrohrs gebildet. Dies geschieht mittels des hydraulischen Innenhochdruckverfahrens. Das Außenrohr bildet damit ein einstückiges Formteil mit einem integrierten Dehnungsausgleicher ohne zusätzliche Schweißverbindungen für die Festlegung des Dehnungsausgleichers. Je nach betriebstechnischen bzw. konstruktiven Erfordernissen können auch mehrere Dehnungsausgleicher vorgesehen sein.The expansion compensator is then formed by hydraulic bellows-like deformation of the wall of the outer tube. This is done using the hydraulic high pressure process. The outer tube thus forms a one-piece molded part with an integrated expansion compensator without additional welded connections for fixing the expansion compensator. Depending on operational or constructional requirements, several expansion compensators can also be provided.
Durch die balgartige Ausbildung des Dehnungsausgleichers in Form von umlaufenden Ausgleichswellen oder -sicken werden die thermisch oder durch Wechsellastanregung bedingten Längenänderungen im Außenrohr elastisch aufgenommen. Äußere Kräfte infolge von Schwingungen werden kompensiert. Längenänderungen des Innenrohrs werden durch eine Schiebesitzanordnug in bekannter Weise ausgeglichen.Due to the bellows-like design of the expansion compensator in the form of rotating balancer shafts or beads, the changes in length caused thermally or by alternating load excitation are absorbed elastically in the outer tube. External forces due to vibrations are compensated. Changes in length of the inner tube are compensated in a known manner by a sliding seat arrangement.
Die Anzahl der einzelnen Ausgleichssicken in einem Dehnungsausgleicher wird auf den jeweiligen Einsatzfall abgestimmt. In einer Abgasleitung können daher auch mehrere Dehnungsausgleicher vorhanden sein, die über eine unterschiedliche Anzahl von Ausgleichssicken verfügen. Auch kann die Höhe bzw. der Durchmesser der einzelnen Ausgleichssicken in einem Dehnungsausgleicher oder von Dehnungsausgleicher zu Dehnungsausgleicher unterschiedlich sein. Die Konfiguration und die Positionierung der Dehnungsausgleicher wird so vorgenommen, daß eine Reduzierung der Bauteilspannungen erreicht wird.The number of individual compensation beads in an expansion compensator is tailored to the respective application. Therefore, several expansion compensators can be present in an exhaust pipe, which have a different number of compensation beads. The height or the diameter of the individual compensating beads in a strain compensator or can vary from strain compensator to strain compensator. The expansion compensators are configured and positioned in such a way that component stresses are reduced.
Die hydraulische Innenhochdruckumformung ermöglicht eine kostengünstige wirtschaftliche Herstellung der Abgasleitung, insbesondere unter dem Aspekt, daß es sich bei den Abgasleitungen um Massenartikel handelt, die in Serie gefertigt werden. Auch ermöglicht die hydraulische Umformung eine hohe Maßgenauigkeit bei kleinsten Fertigungstoleranzen.The hydraulic internal high-pressure forming enables the exhaust pipe to be manufactured economically and economically, in particular from the point that the exhaust pipes are mass-produced items that are mass-produced. The hydraulic forming also enables high dimensional accuracy with the smallest manufacturing tolerances.
Weiterhin zeichnet sich die erfindungsgemäße Abgasleitung durch ihre hohe Eigensteifigkeit aus, wobei ihr Gewicht durch den Wegfall von separaten Dehnungsausgleichern reduziert ist.Furthermore, the exhaust pipe according to the invention is characterized by its high inherent rigidity, its weight being reduced by the omission of separate expansion compensators.
In einer Abgasleitung können ein oder mehrere Dehnungsausgleicher vorgesehen sein. Grundsätzlich ist es möglich, zunächst die Dehnungsausgleicher im Außenrohr herzustellen, anschließend das Innenrohr in das Außenrohr einzubringen und zu fixieren. Hieran kann sich ein Biegevorgang anschließen, um die so geschaffene Abgasleitung bedarfsgerecht umzuformen. Zweckmäßig wird jedoch die Umformung der Wandung des Außenrohrs vorgenommen, nachdem das Innenrohr eingepaßt worden und ggf. der Biegevorgang durchgeführt worden ist.One or more expansion compensators can be provided in an exhaust pipe. In principle, it is possible to first produce the expansion compensators in the outer tube, then insert the inner tube into the outer tube and fix it. This can be followed by a bending process in order to reshape the exhaust pipe created in this way as required. However, the wall of the outer tube is expediently shaped after the inner tube has been fitted in and, if appropriate, the bending process has been carried out.
Eine besonders vorteilhafte Ausgestaltung des erfindungsgemäßen Grundgedankens ist in den Merkmalen des Anspruchs 2 zu sehen. Danach wird der isolierende ringförmige Luftspalt durch hydraulische Aufweitung des Außenrohrs gebildet. Üblicherweise geschieht dies dadurch, daß zunächst ein gerades Innenrohr und ein gerades Außenrohr ineinander geschoben sowie an ihren Endbereichen miteinander verbunden werden. Sie werden dann gemeinsam gebogen, wobei im Innenrohr ein Biegedorn geführt wird.A particularly advantageous embodiment of the basic idea of the invention can be seen in the features of claim 2. The insulating annular air gap is then formed by hydraulic expansion of the outer tube. This is usually done by first pushing a straight inner tube and a straight outer tube into one another and connecting them at their end regions. They are then bent together, with a bending mandrel being guided in the inner tube.
Der so entstandene Rohrkrümmer wird nach dem Biegen in eine der Sollkontur des Außenrohrs entsprechende Kalibrierform eingebracht und die Enden des Außenrohrs druckdicht verschlossen. Anschließend wird in den zwischen dem Innenrohr und dem Außenrohr gebildeten Zwischenraum sowie in das Innenrohr ein hydraulisches Druckmedium mit so hohem Druck gepreßt, daß sich das Außenrohr an die Wandung der Kalibrierform anlegt und die gewünschte Kontur des Außenrohrs entsteht. Da der Druck im Zwischenraum zwischen dem Innen- und dem Außenrohr und im Inneren des Innenrohrs gleich groß ist, bleibt die vorgegebene Form des Innenrohrs unbeeinflußt.The resulting pipe elbow is then bent into a calibration form that corresponds to the target contour of the outer pipe introduced and the ends of the outer tube sealed pressure-tight. A hydraulic pressure medium is then pressed into the space formed between the inner tube and the outer tube and into the inner tube at such a high pressure that the outer tube rests against the wall of the calibration mold and the desired contour of the outer tube is created. Since the pressure in the space between the inner and outer tubes and inside the inner tube is the same, the predetermined shape of the inner tube remains unaffected.
Hierbei ist es grundsätzlich möglich, die balgartige Umformung der Wandung des Außenrohrs und die Aufweitung des Außenrohrs in einem Umformvorgang hydraulisch vorzunehmen. Selbstverständlich können die Vorgänge auch unabhängig voneinander in unterschiedlichen Werkzeugen durchgeführt werden.It is basically possible to hydraulically carry out the bellows-like shaping of the wall of the outer tube and the widening of the outer tube in one shaping process. Of course, the processes can also be carried out independently of one another in different tools.
Durch die Merkmale des Anspruchs 3 ergibt sich eine hohe Standfestigkeit der Abgasleitung, da die Dehnungsausgleicher jeweils in einem Bereich positioniert werden, wo gewährleistet ist, daß die betriebstechnisch auftretenden Spannungen reduziert werden. Die Positionierung wird auf die jeweilige Ausführung der Abgasleitung bauteilgerecht abgestimmt. Die im Betrieb auftretenden Wärmedehnungen und Kräfte aus Lastwechselanregungen werden damit effektiv kompensiert.The features of claim 3 result in a high stability of the exhaust pipe, since the expansion compensators are each positioned in an area where it is ensured that the operationally occurring tensions are reduced. The positioning is matched to the respective design of the exhaust pipe in accordance with the component. This effectively compensates for the thermal expansion and forces arising from load change excitations during operation.
Die erfindungsgemäße Abgasleitung zeichnet sich durch höchste mechanische Belastbarkeit bei großer geometrischer Gestaltungsfreiheit aus. Von Vorteil ist weiterhin, daß nicht nur Gewicht bei den Dehnungsausgleichern selbst eingespart, sondern auch eine Reduzierung der Wanddicke des Außenrohrs möglich ist. Damit verbinden sich zusätzliche Gewichtseinsparungen. Auch können kostengünstigere Materialien als bisher zum Einsatz gelangen.The exhaust pipe according to the invention is characterized by the highest mechanical resilience with great geometric freedom. Another advantage is that not only weight is saved in the expansion compensators themselves, but also a reduction in the wall thickness of the outer tube is possible. This is associated with additional weight savings. Inexpensive materials can also be used than previously.
Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels beschrieben.The invention is described below with reference to an embodiment shown in the drawing.
In der Figur 1 ist in perspektivischer Darstellungsweise ein Ausschnitt aus einem doppelwandigen Rohrkrümmer 1 dargestellt. Dabei ist ein Innenrohr 2 in einem Außenrohr 3 unter Ausbildung eines ringförmigen Luftspalts 4 angeordnet. Durch die Einschnürungen 5, 6 in den Endbereichen 7 und 8 des Rohrkrümmers 1 ist das Innenrohr 2 in seiner radialen Lage im Außenrohr 3 fixiert.A section of a double-walled elbow 1 is shown in perspective in FIG. An inner tube 2 is arranged in an outer tube 3 to form an annular air gap 4. The
Um die infolge des Temperatureinflusses des durch den Rohrkrümmer 1 geführten Abgases auftretende Wärmeausdehnung im Außenrohr 3 zu kompensieren, sind im Außenrohr 3 Dehnungsausgleicher 9, 10 angeordnet. Die Dehnungsausgleicher 9, 10 sind durch hydraulische balgartige Umformung der Wandung 11 des Außenrohrs 3 gebildet. Hierdurch sind in der Wandung 11 Ausgleichswellen 12 geschaffen, welche die thermisch bedingten Längenänderungen elastisch aufnehmen. Die Ausgleichswellen 12 sind in den Bereichen 13, 14 vorgesehen, in denen im Betrieb mit der größten Wärmespannung zu rechnen ist bzw. wo ihr Einsatz den effektivsten Spannungsausgleich erzielt.In order to compensate for the thermal expansion occurring in the outer tube 3 as a result of the temperature influence of the exhaust gas guided through the elbow 1,
- 11
- - Rohrkrümmer- elbow
- 22nd
- - Innenrohr- inner tube
- 33rd
- - Außenrohr- outer tube
- 44th
- - Luftspalt- air gap
- 55
- - Einschnürung- constriction
- 66
- - Einschnürung- constriction
- 77
- - Ende v. 1- end of 1
- 88th
- - Ende v. 1- end of 1
- 99
- - Dehnungsausgleicher- strain compensator
- 1010th
- - Dehnungsausgleicher- strain compensator
- 1111
- - Wandung v. 3- Wall v. 3rd
- 1212th
- - Ausgleichswelle- balance shaft
- 1313
- - Bereich v. 3- area v. 3rd
- 1414
- - Bereich v. 3- area v. 3rd
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19604367 | 1996-02-07 | ||
| DE1996104367 DE19604367C2 (en) | 1996-02-07 | 1996-02-07 | Exhaust pipe |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0789137A2 true EP0789137A2 (en) | 1997-08-13 |
| EP0789137A3 EP0789137A3 (en) | 1998-04-01 |
| EP0789137B1 EP0789137B1 (en) | 2002-01-16 |
Family
ID=7784710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97101684A Expired - Lifetime EP0789137B1 (en) | 1996-02-07 | 1997-02-03 | Exhaust pipe |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0789137B1 (en) |
| DE (1) | DE19604367C2 (en) |
| ES (1) | ES2166478T3 (en) |
| PT (1) | PT789137E (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0837230A3 (en) * | 1996-10-16 | 1998-11-18 | Daimler-Benz Aktiengesellschaft | Exhaust conduit |
| DE19816259A1 (en) * | 1998-04-11 | 1999-10-14 | Audi Ag | Motor vehicle exhaust pipe of concentric inner and outer tubes |
| EP1101997A1 (en) * | 1999-11-18 | 2001-05-23 | Senior Flexonics Automotive Limited | Flexible pipe having fine mesh braid liner |
| EP1211397A1 (en) * | 2000-11-29 | 2002-06-05 | Benteler Automobiltechnik GmbH & Co. KG | Apparatus for treating the exhaust gas of a direct-injection gasoline engine |
| US20110056582A1 (en) * | 2007-11-02 | 2011-03-10 | Witzenmann Gmbh | Exhaust-gas conduction component |
| US9822916B2 (en) | 2014-03-18 | 2017-11-21 | Omachron Intellectual Property Inc. | Expansion compensator with multiple layers with differing stiffness |
| US10046510B2 (en) | 2014-03-25 | 2018-08-14 | Omachron Intellectual Property Inc. | Methods of manufacturing an expansion compensator |
| CN108457735A (en) * | 2018-03-22 | 2018-08-28 | 力帆实业(集团)股份有限公司 | The heat shield structure of gas exhaust piping |
| US10697575B2 (en) | 2014-06-26 | 2020-06-30 | Omachron Intellectual Property Inc. | Expansion compensator |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007048560A1 (en) * | 2007-10-09 | 2009-04-23 | Audi Ag | Device for post-treatment of exhaust gases of a lean-running internal combustion engine |
| CA2846801C (en) | 2014-03-17 | 2017-04-25 | G.B.D. Corp. | Expansion compensator with connectors |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3925802A1 (en) | 1989-08-04 | 1991-02-07 | Bayerische Motoren Werke Ag | Exhaust manifold for use with turbo-charger - has set steel tubes fixed between cast flanges |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3326260A1 (en) * | 1983-07-21 | 1985-02-07 | Witzenmann GmbH, Metallschlauch-Fabrik Pforzheim, 7530 Pforzheim | Exhaust pipe |
| DE3714761A1 (en) * | 1987-05-02 | 1988-11-17 | Witzenmann Metallschlauchfab | Exhaust line for internal combustion engines |
| DE4019899C1 (en) * | 1990-06-22 | 1991-12-19 | Benteler Ag, 4790 Paderborn, De | |
| US5363544A (en) * | 1993-05-20 | 1994-11-15 | Benteler Industries, Inc. | Multi-stage dual wall hydroforming |
| DE19514020A1 (en) * | 1995-04-13 | 1996-10-17 | Daimler Benz Ag | Exhaust manifold, in particular for an internal combustion engine in a motor vehicle, and method for its production |
| DE19546509A1 (en) * | 1995-12-13 | 1997-06-19 | Zeuna Staerker Kg | Exhaust manifold and process for its manufacture |
-
1996
- 1996-02-07 DE DE1996104367 patent/DE19604367C2/en not_active Expired - Fee Related
-
1997
- 1997-02-03 PT PT97101684T patent/PT789137E/en unknown
- 1997-02-03 EP EP97101684A patent/EP0789137B1/en not_active Expired - Lifetime
- 1997-02-03 ES ES97101684T patent/ES2166478T3/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3925802A1 (en) | 1989-08-04 | 1991-02-07 | Bayerische Motoren Werke Ag | Exhaust manifold for use with turbo-charger - has set steel tubes fixed between cast flanges |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0837230A3 (en) * | 1996-10-16 | 1998-11-18 | Daimler-Benz Aktiengesellschaft | Exhaust conduit |
| DE19816259A1 (en) * | 1998-04-11 | 1999-10-14 | Audi Ag | Motor vehicle exhaust pipe of concentric inner and outer tubes |
| EP1101997A1 (en) * | 1999-11-18 | 2001-05-23 | Senior Flexonics Automotive Limited | Flexible pipe having fine mesh braid liner |
| EP1211397A1 (en) * | 2000-11-29 | 2002-06-05 | Benteler Automobiltechnik GmbH & Co. KG | Apparatus for treating the exhaust gas of a direct-injection gasoline engine |
| US20110056582A1 (en) * | 2007-11-02 | 2011-03-10 | Witzenmann Gmbh | Exhaust-gas conduction component |
| US8291943B2 (en) * | 2007-11-02 | 2012-10-23 | Witzenmann Gmbh | Exhaust-gas conduction component |
| US9822916B2 (en) | 2014-03-18 | 2017-11-21 | Omachron Intellectual Property Inc. | Expansion compensator with multiple layers with differing stiffness |
| US10046510B2 (en) | 2014-03-25 | 2018-08-14 | Omachron Intellectual Property Inc. | Methods of manufacturing an expansion compensator |
| US10697575B2 (en) | 2014-06-26 | 2020-06-30 | Omachron Intellectual Property Inc. | Expansion compensator |
| CN108457735A (en) * | 2018-03-22 | 2018-08-28 | 力帆实业(集团)股份有限公司 | The heat shield structure of gas exhaust piping |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0789137A3 (en) | 1998-04-01 |
| DE19604367C2 (en) | 2000-12-07 |
| DE19604367A1 (en) | 1997-08-14 |
| EP0789137B1 (en) | 2002-01-16 |
| ES2166478T3 (en) | 2002-04-16 |
| PT789137E (en) | 2002-05-31 |
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