EP0789137A2 - Conduit d'échappement - Google Patents
Conduit d'échappement 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
Links
Images
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
- F01N13/1805—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
-
- 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
- F01N13/14—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
- F01N13/1883—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.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Exhaust Silencers (AREA)
- Joints Allowing Movement (AREA)
- Fluid-Pressure Circuits (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996104367 DE19604367C2 (de) | 1996-02-07 | 1996-02-07 | Abgasleitung |
DE19604367 | 1996-02-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0789137A2 true EP0789137A2 (fr) | 1997-08-13 |
EP0789137A3 EP0789137A3 (fr) | 1998-04-01 |
EP0789137B1 EP0789137B1 (fr) | 2002-01-16 |
Family
ID=7784710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97101684A Expired - Lifetime EP0789137B1 (fr) | 1996-02-07 | 1997-02-03 | Conduit d'échappement |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0789137B1 (fr) |
DE (1) | DE19604367C2 (fr) |
ES (1) | ES2166478T3 (fr) |
PT (1) | PT789137E (fr) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0837230A3 (fr) * | 1996-10-16 | 1998-11-18 | Daimler-Benz Aktiengesellschaft | Tuyau d'échappement |
DE19816259A1 (de) * | 1998-04-11 | 1999-10-14 | Audi Ag | Abgasrohr für eine Brennkraftmaschine |
EP1101997A1 (fr) * | 1999-11-18 | 2001-05-23 | Senior Flexonics Automotive Limited | Tuyau flexible à revêtement interne tressé à mailles fines |
EP1211397A1 (fr) * | 2000-11-29 | 2002-06-05 | Benteler Automobiltechnik GmbH & Co. KG | Dispositif pour le traitement des gaz d'échappement d'un moteur à allumage commandé et injection directe |
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 (zh) * | 2018-03-22 | 2018-08-28 | 力帆实业(集团)股份有限公司 | 排气管路的隔热罩结构 |
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 (de) * | 2007-10-09 | 2009-04-23 | Audi Ag | Vorrichtung zum Nachbehandeln von Abgasen einer magerlauffähigen Brennkraftmaschine |
CA2846801C (fr) | 2014-03-17 | 2017-04-25 | G.B.D. Corp. | Compensateur de dilatation dote de connecteurs |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3925802A1 (de) | 1989-08-04 | 1991-02-07 | Bayerische Motoren Werke Ag | Abgaskruemmer |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3326260A1 (de) * | 1983-07-21 | 1985-02-07 | Witzenmann GmbH, Metallschlauch-Fabrik Pforzheim, 7530 Pforzheim | Auspuffleitung |
DE3714761A1 (de) * | 1987-05-02 | 1988-11-17 | Witzenmann Metallschlauchfab | Abgasleitung fuer verbrennungsmotoren |
DE4019899C1 (fr) * | 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 (de) * | 1995-04-13 | 1996-10-17 | Daimler Benz Ag | Abgassammelrohr, insbesondere für eine Brennkraftmaschine in einem Kraftfahrzeug, und Verfahren zu dessen Herstellung |
DE19546509A1 (de) * | 1995-12-13 | 1997-06-19 | Zeuna Staerker Kg | Abgaskrümmer sowie Verfahren zu seiner Herstellung |
-
1996
- 1996-02-07 DE DE1996104367 patent/DE19604367C2/de not_active Expired - Fee Related
-
1997
- 1997-02-03 PT PT97101684T patent/PT789137E/pt unknown
- 1997-02-03 ES ES97101684T patent/ES2166478T3/es not_active Expired - Lifetime
- 1997-02-03 EP EP97101684A patent/EP0789137B1/fr not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3925802A1 (de) | 1989-08-04 | 1991-02-07 | Bayerische Motoren Werke Ag | Abgaskruemmer |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0837230A3 (fr) * | 1996-10-16 | 1998-11-18 | Daimler-Benz Aktiengesellschaft | Tuyau d'échappement |
DE19816259A1 (de) * | 1998-04-11 | 1999-10-14 | Audi Ag | Abgasrohr für eine Brennkraftmaschine |
EP1101997A1 (fr) * | 1999-11-18 | 2001-05-23 | Senior Flexonics Automotive Limited | Tuyau flexible à revêtement interne tressé à mailles fines |
EP1211397A1 (fr) * | 2000-11-29 | 2002-06-05 | Benteler Automobiltechnik GmbH & Co. KG | Dispositif pour le traitement des gaz d'échappement d'un moteur à allumage commandé et injection directe |
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 (zh) * | 2018-03-22 | 2018-08-28 | 力帆实业(集团)股份有限公司 | 排气管路的隔热罩结构 |
Also Published As
Publication number | Publication date |
---|---|
EP0789137B1 (fr) | 2002-01-16 |
PT789137E (pt) | 2002-05-31 |
DE19604367C2 (de) | 2000-12-07 |
EP0789137A3 (fr) | 1998-04-01 |
ES2166478T3 (es) | 2002-04-16 |
DE19604367A1 (de) | 1997-08-14 |
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