DE202004000659U1 - Silencers for motor vehicles with internal combustion engines - Google Patents
Silencers for motor vehicles with internal combustion engines Download PDFInfo
- Publication number
- DE202004000659U1 DE202004000659U1 DE202004000659U DE202004000659U DE202004000659U1 DE 202004000659 U1 DE202004000659 U1 DE 202004000659U1 DE 202004000659 U DE202004000659 U DE 202004000659U DE 202004000659 U DE202004000659 U DE 202004000659U DE 202004000659 U1 DE202004000659 U1 DE 202004000659U1
- Authority
- DE
- Germany
- Prior art keywords
- beads
- feature
- housing
- silencer according
- internal combustion
- 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.)
- Expired - Lifetime
Links
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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
Abstract
Schalldämpfer für Kraftfahrzeuge mit Verbrennungsmotor, mindestens umfassend
– ein Gehäuse (1),
– ein Einlassrohr (2),
– ein Auslassrohr (3)
– und gegebenenfalls innere Wände und/oder Rohre,
– das Gehäuse (1) ist mit unregelmäßig angeordneten, mit Hilfe eines FEM-Computerprogramms berechneten Sicken (4, 5, 6, 7, 8) versehen, gekennzeichnet durch die Merkmale:
– die Sicken (4, 5, 6, 7, 8) sind regelmäßig berandete einfache geometrische Figuren,
– die niedrigste Eigenfrequenz des Gehäuses (1) ist größer/gleich der dominanten Anregungsfrequenz des Verbrennungsmotors über dessen gesamten Drehzahlbereich.Silencer for motor vehicles with internal combustion engines, at least comprehensively
- a housing (1),
- an inlet pipe (2),
- an outlet pipe (3)
And, if appropriate, inner walls and / or pipes,
- The housing (1) is provided with irregularly arranged beads (4, 5, 6, 7, 8) calculated using an FEM computer program, characterized by the features:
- the beads (4, 5, 6, 7, 8) are regularly bordered simple geometric figures,
- The lowest natural frequency of the housing (1) is greater than / equal to the dominant excitation frequency of the internal combustion engine over its entire speed range.
Description
Die Erfindung betrifft Schalldämpfer gemäß dem Oberbegriff des Anspruchs 1 für Kraftfahrzeuge mit Verbrennungsmotor.The invention relates to silencers according to the preamble of claim 1 for Motor vehicles with internal combustion engines.
Bei der Auslegung der Geometrie eines Schalldämpfers für Kraftfahrzeuge, gleichgültig ob Ansaugschalldämpfer oder Nachschalldämpfer, müssen die akustischen Anforderungen mit den räumlichen Gegebenheiten im Motorraum bzw. unter dem Chassis in Übereinstimmung gebracht werden. Insbesondere die räumlichen Gegebenheiten führen zu Schalldämpfergehäusen mit ovalem bis kubisch flachem Querschnitt. Um zu verhindern, dass die großflächigen Blechteile des Gehäuses frei schwingen und ungehindert Schall, insbesondere tieffrequenten Schall abstrahlen, wurden die Gehäusebleche mit Einprägungen versehen. Man vergleiche z. B.When designing the geometry of a silencer for motor vehicles, indifferent whether intake silencer or rear silencer, have to the acoustic requirements with the spatial conditions in the engine compartment or under the chassis in accordance to be brought. The spatial conditions in particular lead to silencer housings oval to cubic flat cross section. To prevent the large sheet metal parts of the housing vibrate freely and unhindered sound, especially low-frequency sound radiate, the housing sheets with impressions Mistake. Compare e.g. B.
In der DE-Zeitschrift "ATZ und MTZ", Sonderausgabe Oktober 2003, ist auf den Seiten 39 und 40 eine Topographieoptimierung für den Nachschalldämpfer einer Abgasanlage für Verbrennungsmotoren beschrieben, die unter Verwendung des von der US-Firma Altair Engineering vertriebenen Computerprogramms "Optistruct" durchgeführt wurde. Dieses Computerprogramm, welches auf der Methode der finiten Elemente beruht, ist in der Lage, eine Blechoberfläche selbsttätig so zu optimieren, dass die niedrigste Eigenfrequenz möglichst hoch wird. Je höher die Eigenfrequenz, desto geringer der subjektiv und objektiv empfundene Lärm.In the DE magazine "ATZ and MTZ", special edition October 2003, on pages 39 and 40, a topography optimization for the rear silencer is one Exhaust system for Internal combustion engines are described using the by the US company Altair Engineering distributed computer program "Optistruct" was carried out. This computer program, which is based on the finite element method is able to automatically optimize a sheet surface in such a way that the lowest natural frequency if possible gets high. The higher the Natural frequency, the lower the subjective and objective perceived Noise.
Das Computerprogramm "Optistruct" berechnet ausgehend von der vorgegebenen Form und Größe des Schalldämpfergehäuses die Einprägungen in der Gehäuseoberfläche, die zu der höchstmöglichen Eigenfrequenz führen. Die so berechneten Einprägungen in der Gehäuseoberfläche kann man als unregelmäßig berandete, unregelmäßig positionierte und unregelmäßig getiefte Sicken bezeichnen. Wegen seiner Ähnlichkeit mit den Flecken auf dem Fell einer Kuh wird dieses Sickenbild auch "Kuhflecken-Design" genannt. Auch die Bezeichnung "Sicke Kassel" wird verwendet.The computer program "Optistruct" calculates on the basis of the specified shape and size of the silencer housing indentations in the case surface that to the highest possible Lead natural frequency. The impressions calculated in this way in the housing surface you can as irregularly bordered irregularly positioned and irregularly deep Denote beads. Because of its similarity with the spots on the fur of a cow, this beading is also called "cow spot design". Also the Description "bead Kassel "is used.
So hervorragend die akustischen Ergebnisse der mit solchen Computer-Optimierungsprogrammen ermittelten Sickenbilder sind, so kompliziert und teuer sind die zu ihrer Realisierung benötigten Tiefziehwerkzeuge, da bei der Herstellung der unregelmäßig berandeten und unregelmäßig getieften Matrizen und Patrizen keine einfachen Bearbeitungsverfahren eingesetzt werden können. Das ist unbefriedigend.The acoustic results of the determined with such computer optimization programs Beading pictures are so complicated and expensive to realize required Thermoforming tools, since the edges are irregular in the manufacture and irregularly deep Matrices and patrices used no simple machining processes can be. It is unsatisfactory.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Schalldämpfer der eingangs genannten Art anzugeben, dessen Reduzierung der Schallabstrahlung von der Gehäuseoberfläche minimiert ist, sich jedoch mit erheblich einfacheren und preiswerteren Werkzeugen herstellen lässt.The present invention lies based on the task of a silencer of the aforementioned Specify the type whose reduction in sound radiation from the Housing surface minimized is, however, with considerably simpler and cheaper tools can be made.
Diese Aufgabe wird gelöst durch einen Schalldämpfer mit den Merkmalen des Anspruchs 1.This task is solved by a silencer with the features of claim 1.
Die vorliegende Erfindung beruht auf der Vorgabe, die Schallabstrahlung von der Gehäuseoberfläche mit Hilfe eines Computer-Optimierungsprogramms zu minimieren, wobei das Sickenbild jedoch auf einfache geometrische Formen, die im wesentlichen durch die Metallbearbeitungsverfahren Drehen und Fräsen herstellbar sind, beschränkt wird.The present invention is based on the requirement of using the sound radiation from the housing surface Help minimize a computer optimizer, where the beading, however, is based on simple geometric shapes that are essentially can be manufactured using the metalworking processes of turning and milling are limited becomes.
Vorzugsweise sind dies Kreise und Kreisringe sowie Segmente von Kreisen und Kreisringen, ebenso Vielecke, insbesondere Rechtecke. Diese werden vom Computer-Optimierungsprogramm so dimensioniert und positioniert, dass die niedrigste Eigenfrequenz über den gesamten Drehzahlbereich des Verbrennungsmotors möglichst über dessen dominanter Anregungsfrequenz liegt, wodurch die Schallabstrahlung der Gehäuseoberfläche minimal wird.These are preferably circles and Circular rings and segments of circles and circular rings, as well as polygons, especially rectangles. These are from the computer optimizer dimensioned and positioned so that the lowest natural frequency over the entire speed range of the internal combustion engine, if possible, above its dominant excitation frequency lies, whereby the sound radiation the housing surface becomes minimal.
Vergleiche zwischen erfindungsgemäßen Schalldämpfern und Schalldämpfern mit dem sogenannten Kuhflecken-Design haben überraschenderweise ergeben, dass die akustischen Unterschiede kaum messbar sind. Deutlich unterschiedlich sind jedoch die Herstellkosten.Comparisons between silencers according to the invention and silencers with the so-called cow spot design have surprisingly shown that the acoustic differences are hardly measurable. Significantly different however, are the manufacturing costs.
Gemäß einer vorteilhaften Weiterbildung der Erfindung können die Sicken sich auch gegenseitig durchdringen.According to an advantageous development of the invention the beads also penetrate each other.
Auch ist es möglich, die Sicken in Serie zu positionieren.It is also possible to have the beads in series to position.
Anhand der Zeichnung soll die Erfindung in Form eines Ausführungsbeispiels näher erläutert werden. Es zeigenThe invention is based on the drawing in the form of an embodiment are explained in more detail. Show it
Um die aufgrund der großen und
wenig gekrümmten
Blechflächen
hohe Schallabstrahlung von der Gehäuseoberfläche zu reduzieren, ist in die
Gehäuseoberfläche ein
optimiertes Sickenbild eingeprägt.
Dieses Sickenbild besteht aus regelmäßig berandeten einfachen geometrischen
Figuren. Man erkennt Kreiseringe
Claims (9)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004000659U DE202004000659U1 (en) | 2004-01-17 | 2004-01-17 | Silencers for motor vehicles with internal combustion engines |
DE200510000992 DE102005000992A1 (en) | 2004-01-17 | 2005-01-07 | Exhaust gas silencer for road vehicles having IC engines has a housing with internal features determined by computer simulation |
JP2005003780A JP2005201269A (en) | 2004-01-17 | 2005-01-11 | Muffler for automobile with internal combustion engine |
US11/036,634 US20050155817A1 (en) | 2004-01-17 | 2005-01-14 | Muffler for internal combustion motor vehicles |
KR1020050004009A KR100697796B1 (en) | 2004-01-17 | 2005-01-15 | Muffler for internal combustion motor vehicles |
CNB2005100045535A CN100398788C (en) | 2004-01-17 | 2005-01-17 | Silencer for automobile with IC engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004000659U DE202004000659U1 (en) | 2004-01-17 | 2004-01-17 | Silencers for motor vehicles with internal combustion engines |
Publications (1)
Publication Number | Publication Date |
---|---|
DE202004000659U1 true DE202004000659U1 (en) | 2004-04-15 |
Family
ID=32115810
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE202004000659U Expired - Lifetime DE202004000659U1 (en) | 2004-01-17 | 2004-01-17 | Silencers for motor vehicles with internal combustion engines |
DE200510000992 Withdrawn DE102005000992A1 (en) | 2004-01-17 | 2005-01-07 | Exhaust gas silencer for road vehicles having IC engines has a housing with internal features determined by computer simulation |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200510000992 Withdrawn DE102005000992A1 (en) | 2004-01-17 | 2005-01-07 | Exhaust gas silencer for road vehicles having IC engines has a housing with internal features determined by computer simulation |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050155817A1 (en) |
JP (1) | JP2005201269A (en) |
KR (1) | KR100697796B1 (en) |
CN (1) | CN100398788C (en) |
DE (2) | DE202004000659U1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007134865A1 (en) * | 2006-05-24 | 2007-11-29 | Emcon Technologies Germany (Augsburg) Gmbh | Housing for a component of an exhaust system and such a component |
FR2917122B1 (en) * | 2007-06-08 | 2009-09-04 | Faurecia Sys Echappement | SILENCER FOR EXHAUST LINE OF MOTOR VEHICLE |
KR101499212B1 (en) * | 2009-11-16 | 2015-03-05 | 현대자동차주식회사 | Structure for end plate of vehicle's muffler |
DE102010020826B4 (en) * | 2010-05-18 | 2013-06-06 | Tenneco Gmbh | Exhaust silencer for internal combustion engines and thermoforming tool for this and method for producing such a silencer |
CN113700538A (en) * | 2021-07-28 | 2021-11-26 | 东风汽车集团股份有限公司 | Decorate tail pipe and car tail pipe |
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-
2004
- 2004-01-17 DE DE202004000659U patent/DE202004000659U1/en not_active Expired - Lifetime
-
2005
- 2005-01-07 DE DE200510000992 patent/DE102005000992A1/en not_active Withdrawn
- 2005-01-11 JP JP2005003780A patent/JP2005201269A/en active Pending
- 2005-01-14 US US11/036,634 patent/US20050155817A1/en not_active Abandoned
- 2005-01-15 KR KR1020050004009A patent/KR100697796B1/en not_active IP Right Cessation
- 2005-01-17 CN CNB2005100045535A patent/CN100398788C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN100398788C (en) | 2008-07-02 |
KR20050075730A (en) | 2005-07-21 |
JP2005201269A (en) | 2005-07-28 |
CN1641190A (en) | 2005-07-20 |
DE102005000992A1 (en) | 2005-08-04 |
US20050155817A1 (en) | 2005-07-21 |
KR100697796B1 (en) | 2007-03-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R207 | Utility model specification |
Effective date: 20040519 |
|
R150 | Utility model maintained after payment of first maintenance fee after three years |
Effective date: 20070112 |
|
R157 | Lapse of ip right after 6 years |
Effective date: 20100803 |