DE102007002636B4 - Spring damper element for flexible pipe elements - Google Patents
Spring damper element for flexible pipe elements Download PDFInfo
- Publication number
- DE102007002636B4 DE102007002636B4 DE102007002636.8A DE102007002636A DE102007002636B4 DE 102007002636 B4 DE102007002636 B4 DE 102007002636B4 DE 102007002636 A DE102007002636 A DE 102007002636A DE 102007002636 B4 DE102007002636 B4 DE 102007002636B4
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- Prior art keywords
- spring
- arrangement according
- flexible line
- damper element
- line element
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/10—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations
- F16L27/1004—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations introduced in exhaust pipes for hot gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/10—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations
- F16L27/107—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve
- F16L27/11—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve the sleeve having the form of a bellows with multiple corrugations
- F16L27/111—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve the sleeve having the form of a bellows with multiple corrugations the bellows being reinforced
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/027—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with external reinforcement
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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
Abstract
Anordnung aus einem Feder-Dämpfer-Element und einem flexiblen Leitungselement (21, 31), dadurch gekennzeichnet, dass- das Feder-Dämpfer-Element ein schlauchförmiges, dämpfendes Material (12, 41) aufweist, welches eine schraubengangförmige Torsionsfeder (11) in Bezug auf den Umfang im Wesentlichen umschließt;- das Feder-Dämpfer-Element das flexible Leitungselement (21, 31) an dessen Außenseite umgibt.Arrangement of a spring-damper element and a flexible line element (21, 31), characterized in that- the spring-damper element has a tubular, damping material (12, 41), which a helical torsion spring (11) in relation the spring-damper element surrounds the flexible line element (21, 31) on the outside thereof.
Description
Die Erfindung betrifft ein Feder-Dämpfer-Element für flexible Leitungselemente. Letztere werden zum Ausgleich von Einbautoleranzen und zur Entkopplung von Betriebsschwingungen in Leitungssystemen eingesetzt. Bevorzugtes Anwendungsgebiet des hier beschriebenen Erfindungsgegenstands ist sein Einsatz in Abgasanlagen im PKW- und Nutzfahrzeug-Bereich.The invention relates to a spring-damper element for flexible line elements. The latter are used to compensate for installation tolerances and to decouple operating vibrations in pipe systems. The preferred field of application of the subject matter of the invention described here is its use in exhaust systems in the passenger car and commercial vehicle sector.
Im Abgasstrang von Kraftfahrzeugen entstehen stets Schwingungen, die meist durch Unwuchten von Rotationselementen im Motor, Turbo oder in Nebenaggregaten verursacht werden. Eine weitere Anregung von Schwingungen ist durch die pulsförmigen Druckverläufe des Verbrennungsmotors gegeben, deren Perioden drehzahlabhängig sind und über die Ventile und deren Steuerung in die Abgasanlage gelangen. Neben diesen höherfrequenten Schwingungen können Frequenzen im einstelligen und kleinen zweistelligen Hertz-Bereich durch die Fahrbewegungen in Verbindung mit Fahrbahn-Unebenheiten und deren Rückkopplung in das Fahrgestell angeregt werden.In the exhaust system of motor vehicles, vibrations are always generated, which are mostly caused by unbalance of rotating elements in the engine, turbo or in ancillary units. A further stimulation of vibrations is given by the pulse-shaped pressure curves of the internal combustion engine, the periods of which are speed-dependent and reach the exhaust system via the valves and their controls. In addition to these higher-frequency vibrations, frequencies in the single-digit and small double-digit Hertz range can be excited by the driving movements in connection with uneven road surfaces and their feedback into the chassis.
Flexible Leitungselemente sollen die in die Abgasanlage induzierten Schwingungen entkoppeln. Dabei sind neben den mechanischen bzw. dynamischen Frequenzbändern ebenfalls durch Körperschall emittierte akustische Frequenzen relevant, in speziellen Fällen sogar bis hin in den Frequenzbereich von 5000 Hertz.Flexible pipe elements are intended to decouple the vibrations induced in the exhaust system. In addition to the mechanical or dynamic frequency bands, acoustic frequencies emitted by structure-borne noise are also relevant, in special cases even up to the frequency range of 5000 Hertz.
Flexible Leitungselemente bestehen meist aus metallischen Werkstoffen. Ihr Schwingungsverhalten kann somit durch ihre Massen und Federsteifigkeiten charakterisiert werden. Dämpfungseigenschaften werden oftmals durch Metallgeflechte oder Metallgestricke erzeugt. Diese Dämpfungselemente werden in vielen Fällen als ein das Entkopplungselement ummantelndes Braiding eingesetzt. Eine Variante dieser Bauart ist in
Als gasführende Elemente kommen in vielen Fällen Metallbälge mit symmetrisch zur Rotationsachse ausgebildeten Wellungen oder aber balgartige Geometrien mit einer schraubengangförmigen Kontur am Außenumfang zum Einsatz. Im Betrieb können die in die Abgasanlage induzierten Schwingungen Eigenfrequenzen in den flexiblen Leitungselementen anregen. Im Fall von Metallbälgen mit symmetrisch zur Rotationsachse ausgebildeten Wellungen sind die zu den kleinen Eigenfrequenzen zugehörigen Eigenformen oftmals in der Balgstruktur stehende Longitudinalwellen, deren Anzahl von Schwingungsknoten mit der Ordnung der Eigenfrequenz wächst. Die Höhe dieser Eigenfrequenzen sinkt mit geringer werdender Steifigkeit. Deshalb liegen die Eigenfrequenzen solcher Bauteile um so niedriger, je größer deren Durchmesser und Längen werden. Dies gilt für den PKW-Bereich, wo die oben beschriebenen Lösungen bereits seit längerem etabliert sind. Vor allem aber im Nutzfahrzeug-Bereich, in dem die Durchmesser und Längen der flexiblen Leitungselemente oftmals systembedingt größer sind, ist ein Einsatz von Metallbälgen ohne auf die spezielle Konfiguration angepasste Dämpfungselemente nicht aussichtsreich.In many cases, metal bellows with corrugations formed symmetrically to the axis of rotation or bellows-like geometries with a helical contour on the outer circumference are used as gas-carrying elements. During operation, the vibrations induced in the exhaust system can excite natural frequencies in the flexible pipe elements. In the case of metal bellows with corrugations symmetrical to the axis of rotation, the natural forms associated with the small natural frequencies are often standing longitudinal waves in the bellows structure, the number of vibration nodes increasing with the order of the natural frequency. The level of these natural frequencies decreases with decreasing stiffness. Therefore, the natural frequencies of such components are lower, the larger their diameters and lengths become. This applies to the passenger car sector, where the solutions described above have been established for a long time. Above all, however, in the commercial vehicle sector, where the diameters and lengths of the flexible line elements are often greater due to the system, the use of metal bellows without damping elements adapted to the special configuration is not promising.
Da weltweite gesetzliche Vorschriften den Schadstoff-Ausstoß von Nutzfahrzeugen zukünftig deutlich nach unten regulieren, werden Abgasanlagen zukünftig vermehrt mit Nachbehandlungsmodulen wie z.B. Russpartikel-Filtern und SCR-Systemen ausgestattet. Die Aggregate zur Abgas-Nachbehandlung schränken den im Nutzfahrzeug zur Verfügung stehenden Bauraum weiter ein, so dass für jedes verbaute Element, insbesondere auch für das flexible Leitungselement, die Bauraum-Minimierung eine wichtige Gestaltungsregel ist. Parallel dazu steigt die spezifizierte Mindest-Lebensdauer signifikant.Since global legal regulations will significantly lower the pollutant emissions of commercial vehicles in the future, exhaust systems will increasingly be equipped with aftertreatment modules such as soot particle filters and SCR systems in the future. The units for exhaust gas aftertreatment further restrict the installation space available in the commercial vehicle, so that minimizing installation space is an important design rule for each built-in element, especially also for the flexible pipe element. At the same time, the specified minimum service life increases significantly.
Die Forderung nach Minimierung des Bauraums für das Gesamtsystem wird dadurch erfüllt, dass das flexible Leitungselement mit einer möglichst kleinen sowohl statischen als auch dynamischen Steifigkeit ausgelegt wird. Dies ist eine Nebenbedingung der hier beschriebenen Erfindung und bietet u.a. den Vorteil, dass eine kleine statische Steifigkeit bei vorliegenden Einbautoleranzen in das Leitungssystem zu ebenfalls kleinen Vorspannkräften und damit einhergehenden kleinen Strukturspannungen im Entkopplungselement führt. The requirement to minimize the installation space for the overall system is met in that the flexible line element is designed with the smallest possible static and dynamic rigidity. This is a secondary condition of the invention described here and offers the advantage, among other things, that a small static rigidity with existing installation tolerances in the pipe system leads to likewise small pretensioning forces and the associated small structural stresses in the decoupling element.
Aufgabe der Erfindung ist es, ein Element bereitzustellen, dass in Verbindung mit einem flexiblen Leitungselement zu einem System führt, welches eine ausreichende Entkopplung der Betriebsschwingungen bei gleichzeitig kleinstmöglichem Bauraum, ausreichende Eigenstabilität und eine hohe Lebensdauer bietet. Der einfache und prozesssichere Zusammenbau des Elements mit dem flexiblen Leitungselement ist eine weitere Aufgabe der Erfindung.The object of the invention is to provide an element that, in conjunction with a flexible line element, leads to a system which offers sufficient decoupling of the operating vibrations while at the same time using the smallest possible installation space, sufficient inherent stability and a long service life. The simple and reliable assembly of the element with the flexible conduit element is a further object of the invention.
Die Aufgabe der Erfindung wird durch ein Feder-Dämpfer-Element (
Der Verbund aus einer Torsionsfeder und einem Schlauch aus gestricktem Metallgewebe weist neben den Dämpfungseigenschaften auch eine Steifigkeit auf, welche in Verbindung mit der beschriebenen, möglichst kleinen Steifigkeit des flexiblen Leitungselements, zu einer Systemsteifigkeit führt, die ausreichend groß ist, um die Eigenfrequenzen des Systems aus den Haupt-Anregungsbereichen hinaus nach oben zu verschieben. Da ferner ein flexibles Leitungselement mit kleiner Steifigkeit eine geringe Eigenstabilität hat, kann es im statischen Zustand bereits zu Fehlstellungen, z.B. zum Durchhang gemäß einer Biegelinie kommen. Die gefundene Bauform des Feder-Dämpfer-Elements umgibt das flexible Leitungselement und trägt mit seiner Steifigkeit zu einer Verbesserung der Eigenstabilität des Gesamtsystems bei.The combination of a torsion spring and a hose made of knitted metal fabric has, in addition to the damping properties, a rigidity which, in conjunction with the described, as small as possible rigidity of the flexible conduit element, leads to a system rigidity that is sufficiently high to accommodate the natural frequencies of the system to move the main areas of excitation upwards. Furthermore, since a flexible pipe element with low rigidity has a low inherent stability, misalignments can already occur in the static state, e.g. sagging according to a bending line. The found design of the spring-damper element surrounds the flexible line element and, with its rigidity, contributes to an improvement in the inherent stability of the overall system.
Ein weiterer Vorteil ist, dass die Positionierung des gestrickten Metallgewebes über die Torsionsfeder erfolgt. Auf diese Weise wird eine höhere Lebensdauer des Systems erzielt, da Verschleißerscheinungen am Metallgewebe nicht zum Verrutschen und somit zu einer Änderung der Dämpfungseigenschaften führen.Another advantage is that the knitted metal fabric is positioned via the torsion spring. In this way, a longer service life of the system is achieved, since signs of wear and tear on the metal mesh do not lead to slipping and thus to a change in the damping properties.
Für ein flexibles Leitungselement mit schraubengangförmiger Außenkontur (
Ein drittes Ausführungsbeispiel (
In weiteren Ausführungsbeispielen sind auch Kombinationen der beschriebenen Varianten realisierbar, die als Feder-Dämpfer-Elemente entweder im Bereich der Abgasanlagen oder aber in technologisch benachbarten Bereichen Einsatz finden können. Als mögliche weitere Anwendungsfelder werden beispielhaft stationäre Motoren und Turbinen, Kraftwerke sowie die Klimatechnik genannt.In further exemplary embodiments, combinations of the variants described can also be implemented, which can be used as spring-damper elements either in the area of the exhaust systems or in technologically adjacent areas. Stationary engines and turbines, power plants and air conditioning are named as possible further fields of application.
Claims (14)
Priority Applications (1)
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DE102007002636.8A DE102007002636B4 (en) | 2007-01-12 | 2007-01-12 | Spring damper element for flexible pipe elements |
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DE102007002636.8A DE102007002636B4 (en) | 2007-01-12 | 2007-01-12 | Spring damper element for flexible pipe elements |
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DE102007002636A1 DE102007002636A1 (en) | 2008-07-17 |
DE102007002636B4 true DE102007002636B4 (en) | 2021-11-11 |
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DE102010037162B4 (en) | 2009-08-31 | 2018-05-03 | Westfalia Metallschlauchtechnik Gmbh & Co. Kg | Damping element for decoupling elements, in particular for diaphragm bellows |
DE102016123975A1 (en) * | 2016-12-09 | 2018-06-14 | Witzenmann Gmbh | Steamed flexible pipe element |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4233644C2 (en) | 1992-10-06 | 1994-08-18 | Burgmann Dichtungswerk Feodor | Flexible connection arrangement for two pipe parts, especially in exhaust systems of motor vehicles |
DE20023409U1 (en) | 1999-02-05 | 2004-02-12 | Witzenmann Gmbh | Element for neutralizing vibrations in exhaust pipe system of internal combustion engine has annular bead formed on upstream guide component in region of end connected to bellows |
DE102004025946A1 (en) | 2003-05-31 | 2005-01-05 | Iwka Balg- Und Kompensatoren-Technologie Gmbh | Vibration absorbing pipe section, in particular for exhaust system of vehicle, assembled of corrugated metal sleeve and woven end pieces |
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2007
- 2007-01-12 DE DE102007002636.8A patent/DE102007002636B4/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4233644C2 (en) | 1992-10-06 | 1994-08-18 | Burgmann Dichtungswerk Feodor | Flexible connection arrangement for two pipe parts, especially in exhaust systems of motor vehicles |
DE20023409U1 (en) | 1999-02-05 | 2004-02-12 | Witzenmann Gmbh | Element for neutralizing vibrations in exhaust pipe system of internal combustion engine has annular bead formed on upstream guide component in region of end connected to bellows |
DE102004025946A1 (en) | 2003-05-31 | 2005-01-05 | Iwka Balg- Und Kompensatoren-Technologie Gmbh | Vibration absorbing pipe section, in particular for exhaust system of vehicle, assembled of corrugated metal sleeve and woven end pieces |
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DE102007002636A1 (en) | 2008-07-17 |
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Owner name: WESTFALIA METAL HOSES GMBH, DE Free format text: FORMER OWNER: WESTFALIA METALLSCHLAUCHTECHNIK GMBH & CO. KG, 57271 HILCHENBACH, DE |
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Representative=s name: BECKMANN, JUERGEN, DIPL.-PHYS. DR.RER.NAT., DE |
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