EP1697923B1 - Component that absorbs airborne sound - Google Patents

Component that absorbs airborne sound Download PDF

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Publication number
EP1697923B1
EP1697923B1 EP04790706A EP04790706A EP1697923B1 EP 1697923 B1 EP1697923 B1 EP 1697923B1 EP 04790706 A EP04790706 A EP 04790706A EP 04790706 A EP04790706 A EP 04790706A EP 1697923 B1 EP1697923 B1 EP 1697923B1
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EP
European Patent Office
Prior art keywords
component according
porous layer
resonance absorber
sound
spacers
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EP04790706A
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German (de)
French (fr)
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EP1697923A1 (en
Inventor
Christine VÖLKER
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Carcoustics Techconsult GmbH
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Carcoustics Techconsult GmbH
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Priority to PL04790706T priority Critical patent/PL1697923T3/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

  • the invention relates to an airborne sound absorbing component, in particular for motor vehicles, with a resonance absorber having a plurality of different sized, spaced apart hollow chambers, and a porous sound-absorbing layer of air-permeable material, which faces the sound incidence, wherein the hollow chambers each one the sound incidence facing oscillatory Wall section include.
  • resonance absorber For sound insulation in motor vehicles in particular engine compartment shields are used, which consist of a so-called resonance absorber.
  • a resonance absorber is for example in EP 0 775 354 B1 described.
  • Resonance absorbers of this type have basically proven themselves in practice. Unsatisfactory, however, is that their sound absorption level drops sharply to higher sound frequencies.
  • porous absorbers of air-permeable material have a good sound absorption coefficient at high frequencies. However, their effectiveness decreases sharply at low frequencies.
  • An airborne sound absorbing molding of the type mentioned is from the DE 40 11 705 C2 known.
  • This molded part has on its surface facing the sound source Helmholtz resonators with different Resonant frequencies on.
  • the Helmholtz resonators are arranged such that the adjacent Helmholtz resonators located in the area of action of the respective lower-frequency Helmholtz resonator have different resonance frequencies from one another and are arranged throughout the area.
  • the surface of the molded part carrying the resonators is designed as a plate absorber, which encloses the Helmholtz resonators in a form-fitting manner and thereby leaves open their openings.
  • the sound-directed surface of this molding is covered with a porous layer consisting of a bonded non-woven fabric or an open-cell foam
  • the present invention has for its object to provide an airborne sound absorbing component of the type mentioned, which has an improved sound absorption capacity over a wide frequency range.
  • the airborne sound absorbing component comprises a resonance absorber which has a multiplicity of hollow chambers of different sizes and spaced apart from each other.
  • the hollow chambers each comprise a wall section facing the sound incidence, which is hermetically sealed and capable of oscillating.
  • a porous, sound-absorbing layer of air-permeable material is present, which also faces the sound incidence.
  • the resonance absorber is provided with at least one spacer, such that at least the greater number of facing the sound incidence Wall sections of the hollow chambers has no contact with the porous layer and is independent of this oscillatory.
  • the component according to the invention is characterized by an improved degree of sound absorption, wherein the sound absorption coefficient in a wide frequency range, in particular in the medium-frequency and high-frequency range from about 400 to about 10,000 Hz, is higher overall than in a conventional resonance absorber.
  • the component according to the invention thus has an improved broadband sound absorption capacity.
  • the component of the invention requires little more space, which is in view of the limited space in motor vehicles, especially in the engine compartment, an advantage. It is advantageous in this context, in particular, that the sound absorptive spaces between the hollow chambers at the sound-facing side of the resonance absorber are utilized by the sound-absorbing layer upstream of the resonance absorber.
  • the spacer or spacers are formed integrally with the resonance absorber.
  • the resonance absorber and / or the porous, sound-absorbing layer it may also be advantageous to manufacture them separately and finally to connect to the resonance absorber and / or the porous, sound-absorbing layer, for example, to bond, to weld or, with appropriate design of the compound, to lock ,
  • the spacers form different distance dimensions relative to a common, located on an outer side of the resonance absorber reference level.
  • the porous layer has portions which are at different distances from a common, located on an outer side of the resonance absorber reference level. It is thus possible to adapt the course or the distance of the porous layer not only with respect to the topography of the hollow chambers, but also with respect to the contour of an adjacent aggregate, in particular the contour of an internal combustion engine or another sound source.
  • the porous, sound-absorbing layer of the component according to the invention can in particular be formed from a non-woven layer and / or an open-cell foam layer.
  • a further advantageous embodiment of the component is characterized in that the porous layer is coated on the outside with a microperforated metal foil, in particular a microperforated aluminum foil.
  • a microperforated metal foil in particular a microperforated aluminum foil.
  • the component according to the invention may optionally be given sufficient heat resistance.
  • this embodiment also makes it possible, if appropriate, to use the component according to the invention as an airborne sound-absorbing heat shield.
  • a further advantageous embodiment of the component according to the invention consists in this context, in that the porous layer is formed from a plurality of layers of an aluminum knitted fabric pressed together to form a mat.
  • the mat Compared to a simple microperforated aluminum foil, the mat has a more favorable sound absorption capacity, while still having a high reflectivity to thermal radiation.
  • the porous layer is hydrophobic and / or oleophobic.
  • the porous layer and the resonance absorber may preferably be made of plastic of the same class of material.
  • the porous layer is detachably connected to the resonance absorber, so that a sorted separation of optionally different types of plastics is possible in a simple manner.
  • a first embodiment of an airborne sound absorbing component according to the invention is shown.
  • the component is formed from a resonance absorber 1, which has a plurality of different sized, mutually spaced hollow chambers 2.
  • the resonance absorber 1 is here a plastic blow molding, which can be produced by extrusion blow molding.
  • the blow molding is made of an extruded plastic tube section having different thickness output wall thicknesses.
  • the starting material may be, for example, polypropylene, in particular fiber-reinforced polypropylene.
  • the finished resonance absorber 1 comprises a structural part 3 and a bottom or support part 4 integrally connected thereto, wherein the hollow chambers 2 are formed in the structural part 3.
  • the structural part 3 is made of the material portion of the extruded plastic tube shaped, which has a smaller wall thickness than the material portion from which the support member 4 is formed.
  • the hollow chambers 2 are box-shaped or cup-shaped and belong to a common airspace enclosed between the structural part 3 and the base or support part 4.
  • the hollow chambers 2 are open on one side, wherein their sound incidence facing vibratory wall sections 5 are closed airtight.
  • the hollow chambers 2 have both different heights and different sized base areas. Between the chamber walls of the structural part 3 and the support part 4 welds 6 are formed, which are punctiform or linear. In particular, here hollow chambers 2 are provided, the chamber walls are welded at substantially the same height extent partially to the support member 4 and are partially directed freely alsaria on the support member 4, while leaving an air gap 7 between an end face of the chamber wall and the support member. 4
  • the airborne sound absorbing component further comprises a porous, sound-absorbing layer 8 of air-permeable material, which faces the sound incidence.
  • the porous layer 8 extends at a distance to the wall sections 5 of the hollow chambers 2, leaving an air-filled free space 9.
  • the spacers 10 are disposed between the hollow chambers 2 and spaced therefrom. They are so dimensioned and arranged that at least the larger number of wall sections 5 of the hollow chambers 2 has no contact with the porous layer 8 and remains independent of this oscillatory.
  • the material of the layer 8 may be, in particular, a nonwoven material and / or an open-pored foam film.
  • the material is preferably hydrophobic and / or oleophobic equipped.
  • the porous layer 8 has a thickness of less than 2 mm. Preferably, the thickness of the layer 8 is in the range of 50 microns and 1 mm.
  • the porous layer 8 is connected at its edge to the resonance absorber 1, so that an air space 11 is defined between the structural part 3 and the layer 8.
  • the height of the air space 11 or the distance a between the resonance absorber 1 and the porous layer 8 is in the range of 0 to 40 mm. In the area above the wall sections 5 of the hollow chambers 2, the distance a can sometimes only be in the range of 3 to 5 mm.
  • the compound of the porous layer 8 with the resonance absorber 1 can be realized by spot or circumferential welding or bonding.
  • the intermediate spaces 11 'between the hollow chambers 2 are used in particular for sound absorption.
  • the spacers 10 are formed integrally with the structural part of the resonance absorber 1. They are as well as serving as resonators hollow chambers 2 during blow molding educated. However, they are not box- or cup-shaped, but essentially funnel-shaped and / or trough-shaped, wherein they have a substantially V-shaped cross-section. Corresponding to the different heights of the hollow chambers 2, the spacers 10 form different distance dimensions relative to a common reference level located on the outside or inside of the resonance absorber 1.
  • Fig. 2 shows a second embodiment, which differs from the previous essentially by the configuration of the spacers.
  • the spacers 10 'shown here are not formed by blow molding. Rather, they are manufactured separately, for example as injection molded parts, and at selected locations spaced apart from the hollow chambers 2 of the structural part 3 with the resonance absorber 1 welded or glued. Alternatively, the spacers 10 'can also be molded directly onto the structural part 3 of the resonance absorber 1.
  • the resonance absorber 1 shown in FIGS. 1 and 2 is preferably a blow molded part. However, it is also possible in principle to produce such a resonance absorber as a plastic injection-molded part.
  • Fig. 3 shows another embodiment of an airborne sound absorbing component according to the invention.
  • the resonance absorber 1 ' is in turn formed from a carrier part 4' and a plurality of box-shaped or cup-shaped hollow chambers 2 comprising structural part 3 '.
  • the structural part 3 'and the support part 4' here are separately manufactured parts, wherein the structural part 3 'from a closed-cell formed by deep drawing Foam film, for example, polyethylene or polypropylene, consists.
  • the hollow chambers 2 are formed in such a way that their chamber walls at substantially the same height extension partially with the support part 4 'are welded and partially free Jerusalemrag on the support member 4' are directed, so that between an end face of the chamber wall and the support member 4 ', an air gap 7 is present and the hollow chambers 2 thus part of a common, between the structural part 3' and the support member 4 'enclosed air space.
  • the hollow chambers 2 are covered with a porous layer 8 of air-permeable material, which is releasably connected to the resonance absorber 1 'at its edge.
  • the connection is realized by U-shaped metal clamps and / or slip-on rails, wherein these clamp-like connecting elements 12 and the edge region of the resonance absorber 1 'and the porous layer 8 have mutually aligned bores for passing fastening screws or the like.
  • the resonance absorber 1 ' is provided with a plurality of spacers 10', which are arranged between hollow chambers 2 and spaced therefrom.
  • the spacers 10 ' are plastic injection-molded parts which are glued or welded to the structural part 3' of the resonance absorber 1 '. They have a foot portion 13 supported on the structural part and a rod-shaped or bar-shaped portion 14 integrally connected thereto.
  • the rod or web-shaped sections 14 are dimensioned so that the porous layer 8 does not respond to the sound incidence facing wall sections 5 'of the hollow chambers 2 are. It is thus ensured that the wall sections 5 'are not loaded by the porous layer 8 and thus are able to oscillate independently of this.
  • the spacers 10 '', 10 ''' can be positively connected or latched to the carrier part 4' of the resonance absorber 1 ".
  • the spacers 10 ", 10 ''' are plastic injection-molded parts, each having an insertion end 15, which is enlarged in Fig. 5.
  • the insertion end 15 is slotted in the longitudinal direction and can be latched in an opening 16 formed in the support part 4'.
  • the internal diameters of both apertures 16, 17 are essentially the same.
  • the male end 15 has two elastically compressible legs 18, 19, at the ends of which projecting locking projections 20,
  • the latching projections 20, 21 are chamfered or rounded in the insertion direction, so that they and thus the elastic legs 18, 19 are brought together when inserted into the openings 17, 16 and return to their original position upon exiting the opening 16.
  • the inner diameter of the opening 16 is slightly smaller than the largest formed by the latching projections 20, 21 e outer diameter.
  • the length of the insertion end 15 is limited by a stop 22.
  • the distance between the flange-like abutment 22 and the latching projections 20, 21 is slightly smaller than the wall thickness composed at this point of support part 4 'and structural part 3.
  • the structural part 3 "is formed from an elastically compressible foam film 15 with slight compression of the closed-cell foam film easily and without play in the opening 16 of the support member 4 'are locked.
  • the structural part 3 "of the resonance absorber 1" has a multiplicity of cup-shaped hollow chambers 2 of different sizes and in particular of different heights, the spacers 10 "and 10 '" comprising two groups of spacers.
  • the porous layer 8 is supported in such a manner that the wall sections 5" of the hollow chambers 2 facing the sound incidence have no contact with the porous layer 8 and are capable of oscillating independently thereof.
  • the spacers 10 "of this group preferably each have an enlarged diameter head 23, which serves the layer 8 as a support surface.
  • the second group of spacers 10 ''' reduce the distance between the porous layer 8 and the base plane 24 of the structural part 3''between two points 25 and 26 where this distance is greater the spacers 10 "of the first group larger, disk-shaped heads 27, on the underside of the top of the porous layer 8 is applied.
  • the porous layer 8 in each case has an opening 28, through which the rod-shaped, the insertion end 15 carrying portion 14 '''of the spacer 10''is passed.
  • the disc-shaped head 27 has a substantially larger diameter than its associated opening 28 in the porous layer 8. While the spacers 10 "of the first group are loaded under pressure, learn the spacers 10 '''of the second group a certain tensile load.
  • the course or the contour of the porous layer 8 can be relatively exactly the envelope or contour of the structural part 3 "while maintaining air spaces 9 above the sound incidence facing vibratable wall sections 5" of the hollow chambers. 2 to adjust.
  • This can be particularly advantageous for non-contact adaptation of the component according to the invention with respect to units arranged above it, for example an oil sump or a cylinder head.
  • FIGS. 6 and 7 show two exemplary embodiments in which a resonance absorber 1 "'has a larger area 30 in which no hollow chambers 2 are formed
  • a gearbox, an oil sump or another aggregate may take up the space required for the formation of hollow chambers 2.
  • the porous, acoustically effective layer 8 in the region 30 not occupied by hollow chambers In order to use this area also for the reduction of the occurring noise emissions.
  • the air which is enclosed between the sound-facing outside of the resonance absorber 1 '"and the porous layer 8, acts at least partially like a spring of a spring-mass system, wherein the existing in the pores of the layer 8 air and / or oscillatory, porous layer 8 itself forms the mass of the system.
  • the porous layer 8 in the larger area 30 of the resonance absorber 1 "" not occupied by hollow chambers 2 is led down to its top side.
  • the layer 8 and the resonance absorber 1 '" can be glued together in this area. welded or connected by fastening means (not shown) such as rivets, locking elements or the like.
  • the above-described airborne sound absorbing components can be used in motor vehicles in particular as engine compartment capsule part and / or as underbody paneling and be prepared accordingly.
  • the porous, air-permeable layer 8 may be outside or partially over the entire surface with a microperforated, heat-shielding aluminum foil (not shown) laminated or covered without adhesive.
  • the layer 8 may also consist of several to a microporous mat compressed layers of an aluminum knitted fabric, which also acts heat-shielding.

Abstract

The invention relates to an airborne-sound absorbing component, in particular for motor vehicles, comprising a resonance absorber ( 1 ) with a plurality of differently sized hollow chambers ( 2 ) spaced apart from each other, and comprising a porous sound-absorbing layer ( 8 ) made of an air-permeable material, which layer faces the incoming sound, wherein in each instance the hollow chambers comprise a wall section ( 5 ) which faces the incoming sound. The wall sections ( 5 ), which face the incoming sound and which are able to oscillate, are closed off so as to be airtight, wherein the resonance absorber ( 1 ) comprises one or several spacers ( 10 ) such that at least the majority of the wall sections ( 5 ) of the hollow chambers ( 2 ), which wall sections face the incoming sound, do not establish contact with the porous layer ( 8 ) and are able to oscillate independently of said porous layer ( 8 ). As a result of these features improved sound absorption capability across a broad frequency range is achieved.

Description

Die Erfindung betrifft ein luftschallabsorbierendes Bauteil, insbesondere für Kraftfahrzeuge, mit einem Resonanzabsorber, der eine Vielzahl unterschiedlich großer, zueinander beabstandeter Hohlkammern aufweist, und einer porösen schallabsorbierenden Lage aus luftdurchlässigem Material, die dem Schalleinfall zugewandt ist, wobei die Hohlkammern jeweils einen dem Schalleinfall zugewandten schwingfähigen Wandungsabschnitt umfassen.The invention relates to an airborne sound absorbing component, in particular for motor vehicles, with a resonance absorber having a plurality of different sized, spaced apart hollow chambers, and a porous sound-absorbing layer of air-permeable material, which faces the sound incidence, wherein the hollow chambers each one the sound incidence facing oscillatory Wall section include.

Zur Schallisolierung bei Kraftfahrzeugen werden insbesondere Motorraumabschirmungen verwendet, die aus einem sogenannten Resonanzabsorber bestehen. Ein solcher Resonanzabsorber ist zum Beispiel in der EP 0 775 354 B1 beschrieben. Resonanzabsorber dieser Art haben sich in der Praxis grundsätzlich bewährt. Unbefriedigend ist jedoch, dass ihr Schallabsorptionsgrad zu höheren Schallfrequenzen stark abfällt.For sound insulation in motor vehicles in particular engine compartment shields are used, which consist of a so-called resonance absorber. Such a resonance absorber is for example in EP 0 775 354 B1 described. Resonance absorbers of this type have basically proven themselves in practice. Unsatisfactory, however, is that their sound absorption level drops sharply to higher sound frequencies.

Porenabsorber aus luftdurchlässigem Material weisen dagegen einen guten Schallabsorptionsgrad bei hohen Frequenzen auf. Ihre Wirksamkeit nimmt jedoch zu niedrigen Frequenzen stark ab.On the other hand, porous absorbers of air-permeable material have a good sound absorption coefficient at high frequencies. However, their effectiveness decreases sharply at low frequencies.

Ein luftschallabsorbierendes Formteil der eingangs genannten Art ist aus der DE 40 11 705 C2 bekannt. Dieses Formteil weist auf seiner zur Schallquelle gerichteten Oberfläche Helmholtz-Resonatoren mit verschiedenen Resonanzfrequenzen auf. Die Helmholtz-Resonatoren sind derart angeordnet, dass die im Wirkungsbereich des jeweils tieferfrequenten Helmholtz-Resonators befindlichen, benachbarten Helmholtz-Resonatoren voneinander verschiedene Resonanzfrequenzen besitzen und flächendeckend angeordnet sind. Die die Resonatoren tragende Fläche des Formteils ist als Plattenabsorber ausgelegt, der die Helmholtz-Resonatoren formschlüssig umfasst und dabei deren Öffnungen freilässt. Bei einer Variante ist die zur Schallseite gerichtete Fläche dieses Formteils mit einer porösen Schicht bedeckt, die aus einem aufgeklebten Vliesstoff oder einem offenporigen Schaumstoff bestehtAn airborne sound absorbing molding of the type mentioned is from the DE 40 11 705 C2 known. This molded part has on its surface facing the sound source Helmholtz resonators with different Resonant frequencies on. The Helmholtz resonators are arranged such that the adjacent Helmholtz resonators located in the area of action of the respective lower-frequency Helmholtz resonator have different resonance frequencies from one another and are arranged throughout the area. The surface of the molded part carrying the resonators is designed as a plate absorber, which encloses the Helmholtz resonators in a form-fitting manner and thereby leaves open their openings. In one variant, the sound-directed surface of this molding is covered with a porous layer consisting of a bonded non-woven fabric or an open-cell foam

Dokumente US 6 202 786 , US 6 305 494 . US 5 892 187 , WO 97/36284 , US 4 273 213 und US 6 286 270 beschreiben ebenfalls Verschiedener Schallabsorbierende Bauteile.Documents US 6,202,786 . US Pat. No. 6,305,494 , US 5,892,187 . WO 97/36284 . US 4,273,213 and US 6,286,270 also describe various sound absorbing components.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein luftschallabsorbierendes Bauteil der eingangs genannten Art zu schaffen, das ein verbessertes Schallabsorptionsvermögen über einen weiten Frequenzbereich aufweist.The present invention has for its object to provide an airborne sound absorbing component of the type mentioned, which has an improved sound absorption capacity over a wide frequency range.

Erfindungsgemäß wird diese Aufgabe durch das in Anspruch 1 definierte Bauteil gelöst.According to the invention this object is achieved by the defined in claim 1 component.

Das erfindungsgemäße luftschallabsorbierende Bauteil umfasst einen Resonanzabsorber, der eine Vielzahl unterschiedlich großer, zueinander beabstandeter Hohlkammern aufweist. Die Hohlkammern umfassen jeweils einen dem Schalleinfall zugewandten Wandungsabschnitt, der luftdicht geschlossenen und schwingfähig ist. Weiter ist eine poröse, schallabsorbierende Lage aus luftdurchlässigem Material vorhanden, die dem Schalleinfall ebenfalls zugewandt ist. Der Resonanzabsorber ist mit mindestens einem Abstandshalter versehen, derart, dass zumindest die größere Anzahl der dem Schalleinfall zugewandten Wandungsabschnitte der Hohlkammern keinen Kontakt zu der porösen Lage hat und unabhängig von dieser schwingfähig ist.The airborne sound absorbing component according to the invention comprises a resonance absorber which has a multiplicity of hollow chambers of different sizes and spaced apart from each other. The hollow chambers each comprise a wall section facing the sound incidence, which is hermetically sealed and capable of oscillating. Next, a porous, sound-absorbing layer of air-permeable material is present, which also faces the sound incidence. The resonance absorber is provided with at least one spacer, such that at least the greater number of facing the sound incidence Wall sections of the hollow chambers has no contact with the porous layer and is independent of this oscillatory.

Das erfindungsgemäße Bauteil zeichnet sich durch einen verbesserten Schallabsorptionsgrad aus, wobei der Schallabsorptionsgrad in einem weiten Frequenzbereich, und zwar insbesondere im mittelfrequenten und hochfrequenten Bereich von etwa 400 bis etwa 10.000 Hz, insgesamt höher liegt als bei einem herkömmlichen Resonanzabsorber. Das erfindungsgemäße Bauteil besitzt somit ein verbessertes breitbandiges Schallabsorptionsvermögen. Das erfindungsgemäße Bauteil benötigt dazu kaum mehr Bauraum, was angesichts des beschränkten Bauraums in Kraftfahrzeugen, insbesondere im Motorraum, von Vorteil ist. Vorteilhaft ist in diesem Zusammenhang insbesondere, dass durch die dem Resonanzabsorber vorgeordnete schallabsorbierende Lage auch die an der dem Schall zugewandten Seite des Resonanzabsorber zwischen den Hohlkammern vorhandenen Zwischenräume zur Schallabsorption genutzt werden.The component according to the invention is characterized by an improved degree of sound absorption, wherein the sound absorption coefficient in a wide frequency range, in particular in the medium-frequency and high-frequency range from about 400 to about 10,000 Hz, is higher overall than in a conventional resonance absorber. The component according to the invention thus has an improved broadband sound absorption capacity. The component of the invention requires little more space, which is in view of the limited space in motor vehicles, especially in the engine compartment, an advantage. It is advantageous in this context, in particular, that the sound absorptive spaces between the hollow chambers at the sound-facing side of the resonance absorber are utilized by the sound-absorbing layer upstream of the resonance absorber.

Nach einer bevorzugten Ausgestaltung sind der oder die Abstandshalter einstückig mit dem Resonanzabsorber ausgebildet. Hierdurch wird mindestens ein Arbeitsschritt bei der Herstellung des erfindungsgemäßen Bauteils eingespart, was zu entsprechend günstigen Herstellungskosten führt. Hinsichtlich der Festigkeit sowie der Gestaltung der Abstandshalter kann es aber auch vorteilhaft sein, diese separat herzustellen und schließlich mit dem Resonanzabsorber und/oder der porösen, schallabsorbierenden Lage zu verbinden, beispielsweise zu verkleben, zu verschweißen oder, bei entsprechender Ausbildung der Verbindung, zu verrasten.According to a preferred embodiment, the spacer or spacers are formed integrally with the resonance absorber. As a result, at least one step in the production of the component according to the invention is saved, which leads to correspondingly low production costs. With regard to the strength and the design of the spacers, it may also be advantageous to manufacture them separately and finally to connect to the resonance absorber and / or the porous, sound-absorbing layer, for example, to bond, to weld or, with appropriate design of the compound, to lock ,

Eine andere vorteilhafte Ausgestaltung des erfindungsgemäßen Bauteils besteht darin, dass die Abstandshalter unterschiedliche Abstandsmaße bezogen auf ein gemeinsames, an einer Außenseite des Resonanzabsorbers gelegenes Bezugsniveau bilden. Insbesondere ist vorgesehen, dass die poröse Lage Abschnitte aufweist, die unterschiedlich weit von einem gemeinsamen, an einer Außenseite des Resonanzabsorbers gelegenen Bezugsniveau beabstandet sind. Es ist somit möglich, den Verlauf bzw. den Abstand der porösen Lage nicht nur bezüglich der Topographie der Hohlkammern anzupassen, sondern auch bezüglich der Kontur eines benachbarten Aggregats, insbesondere der Kontur eines Verbrennungsmotors oder einer anderen Schallquelle.Another advantageous embodiment of the component according to the invention is that the spacers form different distance dimensions relative to a common, located on an outer side of the resonance absorber reference level. In particular, it is provided that the porous layer has portions which are at different distances from a common, located on an outer side of the resonance absorber reference level. It is thus possible to adapt the course or the distance of the porous layer not only with respect to the topography of the hollow chambers, but also with respect to the contour of an adjacent aggregate, in particular the contour of an internal combustion engine or another sound source.

Die poröse, schallabsorbierende Lage des erfindungsgemäßen Bauteils kann insbesondere aus einer Vliesschicht und/oder einer offenzelligen Schaumstofflage gebildet werden.The porous, sound-absorbing layer of the component according to the invention can in particular be formed from a non-woven layer and / or an open-cell foam layer.

Eine weitere vorteilhafte Ausgestaltung des Bauteils ist dadurch gekennzeichnet, dass die poröse Lage außenseitig mit einer mikroperforierten Metallfolie, insbesondere einer mikroperforierten Aluminiumfolie beschichtet ist. Auf diese Weise kann dem erfindungsgemäßen Bauteil gegebenenfalls eine ausreichende Hitzebeständigkeit verliehen werden. Insbesondere ermöglicht diese Ausgestaltung auch gegebenenfalls den Einsatz des erfindungsgemäßen Bauteils als luftschallabsorbierendes Hitzeschild.A further advantageous embodiment of the component is characterized in that the porous layer is coated on the outside with a microperforated metal foil, in particular a microperforated aluminum foil. In this way, the component according to the invention may optionally be given sufficient heat resistance. In particular, this embodiment also makes it possible, if appropriate, to use the component according to the invention as an airborne sound-absorbing heat shield.

Eine weitere vorteilhafte Ausgestaltung des erfindungsgemäßen Bauteils besteht in diesem Zusammenhang darin, dass die poröse Lage aus mehreren zu einer Matte zusammengepressten Lagen einer Aluminium-Wirkware gebildet ist. Gegenüber einer einfachen mikroperforierten Aluminiumfolie besitzt die Matte ein günstigeres Schallabsorptionsvermögen, wobei sie zugleich noch ein hohes Reflexionsvermögen gegenüber Wärmestrahlung besitzt.A further advantageous embodiment of the component according to the invention consists in this context, in that the porous layer is formed from a plurality of layers of an aluminum knitted fabric pressed together to form a mat. Compared to a simple microperforated aluminum foil, the mat has a more favorable sound absorption capacity, while still having a high reflectivity to thermal radiation.

Um das vorhandene Schallabsorptionsvermögen der porösen Lage im Motorraum eines Kraftfahrzeuges langfristig zu sichern, ist nach einer weiteren Ausgestaltung des erfindungsgemäßen Bauteils vorgesehen, dass die poröse Lage hydrophob und/oder oleophob ausgerüstet ist.In order to secure the existing sound absorption capacity of the porous layer in the engine compartment of a motor vehicle in the long term, it is provided according to a further embodiment of the component according to the invention that the porous layer is hydrophobic and / or oleophobic.

Hinsichtlich einer späteren Wiederverwertung des erfindungsgemäßen Bauteils können die poröse Lage und der Resonanzabsorber vorzugsweise aus Kunststoff der gleichen Materialklasse hergestellt werden. Alternativ oder ergänzend ist es auch vorteilhaft, wenn die poröse Lage mit dem Resonanzabsorber lösbar verbunden ist, sodass eine sortenreine Trennung gegebenenfalls verschiedener Kunststofftypen auf einfache Weise möglich ist.With regard to a later recycling of the component according to the invention, the porous layer and the resonance absorber may preferably be made of plastic of the same class of material. Alternatively or additionally, it is also advantageous if the porous layer is detachably connected to the resonance absorber, so that a sorted separation of optionally different types of plastics is possible in a simple manner.

Weitere bevorzugte und vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Further preferred and advantageous embodiments of the invention are specified in the subclaims.

Nachfolgend wird die Erfindung anhand einer mehrere Ausführungsbeispiele darstellenden Zeichnung näher erläutert. Es zeigen schematisch:

Fig. 1
eine Querschnittsansicht eines erfindungsgemäßen Bauteils in einer ersten Ausführungsform,
Fig. 2
eine Querschnittsansicht eines erfindungsgemäßen Bauteils in einer zweiten Ausführungsform;
Fig. 3
eine Querschnittsansicht eines erfindungsgemäßen Bauteils in einer dritten Ausführungsform;
Fig. 4
eine Querschnittsansicht eines erfindungsgemäßen Bauteils in einer vierten Ausführungsform;
Fig. 5
eine vergrößerte, detailierte Darstellung der Einzelheit X in Fig. 4;
Fig. 6
eine Querschnittsansicht eines erfindungsgemäßen Bauteils in einer fünften Ausführungsform; und
Fig. 7
eine Querschnittsansicht eines erfindungsgemäßen Bauteils in einer sechsten Ausführungsform.
The invention will be explained in more detail with reference to a drawing illustrating several embodiments. They show schematically:
Fig. 1
a cross-sectional view of a component according to the invention in a first embodiment,
Fig. 2
a cross-sectional view of a component according to the invention in a second embodiment;
Fig. 3
a cross-sectional view of a component according to the invention in a third embodiment;
Fig. 4
a cross-sectional view of a component according to the invention in a fourth embodiment;
Fig. 5
an enlarged, detailed representation of the detail X in Fig. 4;
Fig. 6
a cross-sectional view of a component according to the invention in a fifth embodiment; and
Fig. 7
a cross-sectional view of a component according to the invention in a sixth embodiment.

In Fig. 1 ist ein erstes Ausführungsbeispiel eines erfindungsgemäßen luftschallabsorbierenden Bauteils dargestellt. Das Bauteil ist aus einem Resonanzabsorber 1 gebildet, der eine Vielzahl unterschiedlich großer, zueinander beabstandeter Hohlkammern 2 aufweist. Der Resonanzabsorber 1 ist hier ein Kunststoff-Blasformteil, das durch Extrusions-Blasformen herstellbar ist. Das Blasformteil wird aus einem extrudierten Kunststoffschlauchabschnitt gefertigt, der unterschiedliche dicke Ausgangswandstärken aufweist. Bei dem Ausgangsmaterial kann es sich beispielsweise um Polypropylen, insbesondere um faserverstärktes Polypropylen handeln.In Fig. 1, a first embodiment of an airborne sound absorbing component according to the invention is shown. The component is formed from a resonance absorber 1, which has a plurality of different sized, mutually spaced hollow chambers 2. The resonance absorber 1 is here a plastic blow molding, which can be produced by extrusion blow molding. The blow molding is made of an extruded plastic tube section having different thickness output wall thicknesses. The starting material may be, for example, polypropylene, in particular fiber-reinforced polypropylene.

Der fertige Resonanzabsorber 1 umfasst ein Strukturteil 3 und ein damit einstückig verbundenes Boden- bzw. Trägerteil 4, wobei die Hohlkammern 2 in dem Strukturteil 3 ausgebildet sind. Das Strukturteil 3 ist aus dem Materialabschnitt des extrudierten Kunststoffschlauches geformt, der eine geringere Wandstärke aufweist als der Materialabschnitt, aus dem das Trägerteil 4 gebildet ist.The finished resonance absorber 1 comprises a structural part 3 and a bottom or support part 4 integrally connected thereto, wherein the hollow chambers 2 are formed in the structural part 3. The structural part 3 is made of the material portion of the extruded plastic tube shaped, which has a smaller wall thickness than the material portion from which the support member 4 is formed.

Die Hohlkammern 2 sind kästchen- bzw. becherförmig ausgebildet und gehören zu einem gemeinsamen, zwischen dem Strukturteil 3 und dem Boden- bzw. Trägerteil 4 eingeschlossenen Luftraum. Die Hohlkammern 2 sind einseitig offen, wobei ihre dem Schalleinfall zugewandten schwingfähigen Wandungsabschnitte 5 luftdicht geschlossen sind.The hollow chambers 2 are box-shaped or cup-shaped and belong to a common airspace enclosed between the structural part 3 and the base or support part 4. The hollow chambers 2 are open on one side, wherein their sound incidence facing vibratory wall sections 5 are closed airtight.

Es ist zu erkennen, dass die Hohlkammern 2 sowohl unterschiedliche Höhen als auch unterschiedlich große Grundflächen aufweisen. Zwischen den Kammerwänden des Strukturteils 3 und dem Trägerteil 4 sind Verschweißungen 6 ausgebildet, die punktförmig sind oder linienförmig verlaufen. Insbesondere sind hier Hohlkammern 2 vorgesehen, deren Kammerwände bei im wesentlichen gleicher Höhenerstreckung teilweise mit dem Trägerteil 4 verschweißt sind und teilweise freikragend auf das Trägerteil 4 zu gerichtet sind, und zwar unter Belassung eines Luftspaltes 7 zwischen einer Stirnfläche der Kammerwand und dem Trägerteil 4.It can be seen that the hollow chambers 2 have both different heights and different sized base areas. Between the chamber walls of the structural part 3 and the support part 4 welds 6 are formed, which are punctiform or linear. In particular, here hollow chambers 2 are provided, the chamber walls are welded at substantially the same height extent partially to the support member 4 and are partially directed freely aufrag on the support member 4, while leaving an air gap 7 between an end face of the chamber wall and the support member. 4

Das luftschallabsorbierende Bauteil weist ferner eine poröse, schallabsorbierende Lage 8 aus luftdurchlässigem Material auf, die dem Schalleinfall zugewandt ist. Die poröse Lage 8 verläuft beabstandet zu den Wandungsabschnitten 5 der Hohlkammern 2 unter Belassung eines luftgefüllten Freiraums 9. Zur Schaffung bzw. Aufrechterhaltung des jeweiligen Freiraums 9 zwischen der porösen, luftdurchlässigen Lage 8 und den dem Schalleinfall zugewandten, schwingfähigen Wandungsabschnitten 5 ist der Resonanzabsorber 1 mit mehreren Abstandshaltern 10 versehen. Die Abstandshalter 10 sind zwischen den Hohlkammern 2 und beabstandet zu diesen angeordnet. Sie sind so bemessen und angeordnet, dass zumindest die größere Anzahl der Wandungsabschnitte 5 der Hohlkammern 2 keinen Kontakt zu der porösen Lage 8 hat und unabhängig von dieser schwingfähig bleibt.The airborne sound absorbing component further comprises a porous, sound-absorbing layer 8 of air-permeable material, which faces the sound incidence. The porous layer 8 extends at a distance to the wall sections 5 of the hollow chambers 2, leaving an air-filled free space 9. To create or maintain the respective free space 9 between the porous, air-permeable layer 8 and the sound incidence facing vibratable wall sections 5 of the resonance absorber 1 with several spacers 10 provided. The spacers 10 are disposed between the hollow chambers 2 and spaced therefrom. They are so dimensioned and arranged that at least the larger number of wall sections 5 of the hollow chambers 2 has no contact with the porous layer 8 and remains independent of this oscillatory.

Bei dem Material der Lage 8 kann sich insbesondere um ein Faservliesmaterial und/oder eine offenporige Schaumstofffolie handeln. Das Material ist vorzugsweise hydrophob und/oder oleophob ausgerüstet. Die poröse Lage 8 weist eine Dicke von weniger als 2 mm auf. Vorzugsweise liegt die Dicke der Lage 8 im Bereich von 50 µm und 1 mm.The material of the layer 8 may be, in particular, a nonwoven material and / or an open-pored foam film. The material is preferably hydrophobic and / or oleophobic equipped. The porous layer 8 has a thickness of less than 2 mm. Preferably, the thickness of the layer 8 is in the range of 50 microns and 1 mm.

Die poröse Lage 8 ist an ihrem Rand mit dem Resonanzabsorber 1 verbunden, sodass zwischen dem Strukturteil 3 und der Lage 8 ein Luftraum 11 definiert ist. Die Höhe des Luftraums 11 bzw. der Abstand a zwischen dem Resonanzabsorber 1 und der porösen Lage 8 liegt im Bereich von 0 bis 40 mm. Im Bereich oberhalb der Wandungsabschnitte 5 der Hohlkammern 2 kann der Abstand a mitunter nur im Bereich von 3 bis 5 mm liegen. Die Verbindung der porösen Lage 8 mit dem Resonanzabsorber 1 kann durch stellenweise oder umlaufende Verschweißung oder Verklebung realisiert sein.The porous layer 8 is connected at its edge to the resonance absorber 1, so that an air space 11 is defined between the structural part 3 and the layer 8. The height of the air space 11 or the distance a between the resonance absorber 1 and the porous layer 8 is in the range of 0 to 40 mm. In the area above the wall sections 5 of the hollow chambers 2, the distance a can sometimes only be in the range of 3 to 5 mm. The compound of the porous layer 8 with the resonance absorber 1 can be realized by spot or circumferential welding or bonding.

Durch die poröse Lage 8 werden insbesondere auch die zwischen den Hohlkammern 2 vorhandenen Zwischenräume 11' für eine Schallabsorption genutzt.Due to the porous layer 8, the intermediate spaces 11 'between the hollow chambers 2 are used in particular for sound absorption.

Bei dem in Fig. 1 gezeigten Ausführungsbeispiel sind die Abstandshalter 10 einstückig mit dem Strukturteil des Resonanzabsorbers 1 ausgebildet. Sie werden ebenso wie die als Resonatoren dienenden Hohlkammern 2 beim Blasformen gebildet. Sie sind allerdings nicht kästchen- bzw. becherförmig, sondern im wesentlichen trichter- und/oder muldenförmig ausgebildet, wobei sie einen im wesentlichen v-förmigen Querschnitt aufweisen. Entsprechend den unterschiedlichen Höhen der Hohlkammern 2 bilden die Abstandshalter 10 unterschiedliche Abstandsmaße bezogen auf ein gemeinsames, an der Außen- oder Innenseite des Resonanzabsorbers 1 gelegenes Bezugsniveau.In the embodiment shown in FIG. 1, the spacers 10 are formed integrally with the structural part of the resonance absorber 1. They are as well as serving as resonators hollow chambers 2 during blow molding educated. However, they are not box- or cup-shaped, but essentially funnel-shaped and / or trough-shaped, wherein they have a substantially V-shaped cross-section. Corresponding to the different heights of the hollow chambers 2, the spacers 10 form different distance dimensions relative to a common reference level located on the outside or inside of the resonance absorber 1.

Fig. 2 zeigt ein zweites Ausführungsbeispiel, das sich von dem Vorherigen im wesentlichen durch die Ausgestaltung der Abstandshalter unterscheidet. Die hier gezeigten Abstandshalter 10' werden nicht durch Blasformen gebildet. Sie werden vielmehr separat gefertigt, beispielsweise als Spritzgießteile, und an ausgewählten Stellen beabstandet zu den Hohlkammern 2 des Strukturteils 3 mit dem Resonanzabsorber 1 verschweißt oder verklebt. Alternativ können die Abstandshalter 10' auch direkt an dem Strukturteil 3 des Resonanzabsorbers 1 angespritzt werden.Fig. 2 shows a second embodiment, which differs from the previous essentially by the configuration of the spacers. The spacers 10 'shown here are not formed by blow molding. Rather, they are manufactured separately, for example as injection molded parts, and at selected locations spaced apart from the hollow chambers 2 of the structural part 3 with the resonance absorber 1 welded or glued. Alternatively, the spacers 10 'can also be molded directly onto the structural part 3 of the resonance absorber 1.

Der in den Figuren 1 und 2 dargestellte Resonanzabsorber 1 ist vorzugsweise ein Blasformteil. Es ist jedoch grundsätzlich auch möglich, einen derartigen Resonanzabsorber als Kunststoff-Spritzgießteil herzustellen.The resonance absorber 1 shown in FIGS. 1 and 2 is preferably a blow molded part. However, it is also possible in principle to produce such a resonance absorber as a plastic injection-molded part.

Fig. 3 zeigt ein weiteres Ausführungsbeispiel eines erfindungsgemäßen luftschallabsorbierenden Bauteils. Der Resonanzabsorber 1' ist wiederum aus einem Trägerteil 4' und einem eine Vielzahl von kästchen- bzw. becherförmigen Hohlkammern 2 aufweisen Strukturteil 3' gebildet. Das Strukturteil 3' und das Trägerteil 4' sind hier jedoch getrennt hergestellte Teile, wobei das Strukturteil 3' aus einer durch Tiefziehen umgeformten geschlossenzelligen Schaumstofffolie, beispielsweise aus Polyethylen oder Polypropylen, besteht.Fig. 3 shows another embodiment of an airborne sound absorbing component according to the invention. The resonance absorber 1 'is in turn formed from a carrier part 4' and a plurality of box-shaped or cup-shaped hollow chambers 2 comprising structural part 3 '. However, the structural part 3 'and the support part 4' here are separately manufactured parts, wherein the structural part 3 'from a closed-cell formed by deep drawing Foam film, for example, polyethylene or polypropylene, consists.

Auch bei diesem Ausführungsbeispiel sind die Hohlkammern 2 in der Weise ausgebildet, dass deren Kammerwände bei im wesentlichen gleicher Höhenerstreckung teilweise mit dem Trägerteil 4' verschweißt sind und teilweise freikragend auf das Trägerteil 4' zu gerichtet sind, sodass zwischen einer Stirnfläche der Kammerwand und dem Trägerteil 4' ein Luftspalt 7 vorhanden ist und die Hohlkammern 2 somit Teil eines gemeinsamen, zwischen dem Strukturteil 3' und dem Trägerteil 4' eingeschlossenen Luftraums sind.Also in this embodiment, the hollow chambers 2 are formed in such a way that their chamber walls at substantially the same height extension partially with the support part 4 'are welded and partially free aufrag on the support member 4' are directed, so that between an end face of the chamber wall and the support member 4 ', an air gap 7 is present and the hollow chambers 2 thus part of a common, between the structural part 3' and the support member 4 'enclosed air space.

Die Hohlkammern 2 sind mit einer porösen Lage 8 aus luftdurchlässigem Material bedeckt, die mit dem Resonanzabsorber 1' an dessen Rand lösbar verbunden ist. Die Verbindung ist durch U-förmige Metallklammern und/oder Aufsteckschienen realisiert, wobei diese klammerartigen Verbindungselemente 12 sowie der Randbereich des Resonanzabsorbers 1' und der porösen Lage 8 miteinander fluchtende Bohrungen zum Durchführen von Befestigungsschrauben oder dergleichen aufweisen.The hollow chambers 2 are covered with a porous layer 8 of air-permeable material, which is releasably connected to the resonance absorber 1 'at its edge. The connection is realized by U-shaped metal clamps and / or slip-on rails, wherein these clamp-like connecting elements 12 and the edge region of the resonance absorber 1 'and the porous layer 8 have mutually aligned bores for passing fastening screws or the like.

Wie bei den zuvor beschriebenen Ausführungsbeispielen ist der Resonanzabsorber 1' mit mehreren Abstandshaltern 10' versehen, die zwischen Hohlkammern 2 und beabstandet zu diesen angeordnet sind. Bei den Abstandshalter 10' handelt es sich um Kunststoff-Spritzgießteile, die mit dem Strukturteil 3' des Resonanzabsorbers 1' verklebt oder verschweißt sind. Sie weisen einen auf dem Strukturteil abgestützten Fußabschnitt 13 und einen damit einstückig verbundenen stab- oder stegförmigen Abschnitt 14 auf. Die stab- bzw. stegförmigen Abschnitte 14 sind so bemessen, dass die poröse Lage 8 nicht auf den dem Schalleinfall zugewandten Wandungsabschnitten 5' der Hohlkammern 2 liegen. Es ist also sichergestellt, dass die Wandungsabschnitte 5' durch die poröse Lage 8 nicht belastet werden und somit unabhängig von dieser schwingfähig sind.As in the previously described embodiments, the resonance absorber 1 'is provided with a plurality of spacers 10', which are arranged between hollow chambers 2 and spaced therefrom. The spacers 10 'are plastic injection-molded parts which are glued or welded to the structural part 3' of the resonance absorber 1 '. They have a foot portion 13 supported on the structural part and a rod-shaped or bar-shaped portion 14 integrally connected thereto. The rod or web-shaped sections 14 are dimensioned so that the porous layer 8 does not respond to the sound incidence facing wall sections 5 'of the hollow chambers 2 are. It is thus ensured that the wall sections 5 'are not loaded by the porous layer 8 and thus are able to oscillate independently of this.

Die luftgefüllten Leerräume 9, die durch die Abstandshalter 10' zwischen der porösen Lage 8 und den dem Schalleinfall zugewandten, schwingfähigen Wandungsabschnitten 5' der Hohlkammern 2 gebildet sind, weisen wiederum unterschiedliche Höhen auf.The air-filled voids 9, which are formed by the spacers 10 'between the porous layer 8 and the sound incidence facing vibratable wall sections 5' of the hollow chambers 2, in turn, have different heights.

Bei dem in Fig. 4 dargestellten Ausführungsbeispiel sind die Abstandshalter 10", 10''' mit dem Trägerteil 4' des Resonanzabsorbers 1" formschlüssig verbindbar bzw. verrastbar. Die Abstandshaltern 10", 10''' sind Kunststoff-Spritzgießteile. Sie weisen jeweils ein Einsteckende 15 auf, das in Fig. 5 vergrößert dargestellt ist. Das Einsteckende 15 ist in Längsrichtung geschlitzt und in einem im Trägerteil 4' ausgebildeten Durchbruch 16 verrastbar. Dem Durchbruch 16 ist ein damit fluchtender Durchbruch 17 im Strukturteil 3'' zugeordnet. Die Innendurchmesser beider Durchbrüche 16, 17 sind im wesentlichen gleich. Das Einsteckende 15 weist zwei elastisch zusammendrückbare Schenkel 18, 19 auf, an deren Enden nach außen vorstehende Rastvorsprünge 20, 21 ausgebildet sind. Die Rastvorsprünge 20, 21 sind in Einsteckrichtung abgeschrägt bzw. abgerundet, so dass sie und damit die elastischen Schenkel 18, 19 beim Einführen in die Durchbrüche 17, 16 zusammengeführt und beim Austritt aus dem Durchbruch 16 wieder in ihre Ursprungslage zurückkehren. Der Innendurchmesser des Durchbruchs 16 ist etwas kleiner als der größte von den Rastvorsprüngen 20, 21 gebildete Außendurchmesser. Die Länge des Einsteckendes 15 ist durch einen Anschlag 22 begrenzt. Der Abstand zwischen dem flanschartigen Anschlag 22 und den Rastvorsprüngen 20, 21 ist etwas kleiner als die an dieser Stelle aus Trägerteil 4' und Strukturteil 3" zusammengesetzte Wanddicke. Da das Strukturteil 3" bei diesem Ausführungsbeispiel jedoch aus einer elastisch zusammenpressbaren Schaumstofffolie gebildet ist, kann das Einsteckende 15 unter leichter Verdichtung der geschlossenzelligen Schaumstofffolie problemlos und spielfrei im Durchbruch 16 des Trägerteils 4' verrastet werden.In the exemplary embodiment illustrated in FIG. 4, the spacers 10 '', 10 '''can be positively connected or latched to the carrier part 4' of the resonance absorber 1 ". The spacers 10 ", 10 '''are plastic injection-molded parts, each having an insertion end 15, which is enlarged in Fig. 5. The insertion end 15 is slotted in the longitudinal direction and can be latched in an opening 16 formed in the support part 4'. The apertures 17 in the structural part 3 "are aligned with the breakthrough 16. The internal diameters of both apertures 16, 17 are essentially the same.The male end 15 has two elastically compressible legs 18, 19, at the ends of which projecting locking projections 20, The latching projections 20, 21 are chamfered or rounded in the insertion direction, so that they and thus the elastic legs 18, 19 are brought together when inserted into the openings 17, 16 and return to their original position upon exiting the opening 16. The inner diameter of the opening 16 is slightly smaller than the largest formed by the latching projections 20, 21 e outer diameter. The length of the insertion end 15 is limited by a stop 22. The distance between the flange-like abutment 22 and the latching projections 20, 21 is slightly smaller than the wall thickness composed at this point of support part 4 'and structural part 3. However, in this embodiment, the structural part 3 "is formed from an elastically compressible foam film 15 with slight compression of the closed-cell foam film easily and without play in the opening 16 of the support member 4 'are locked.

Das Strukturteil 3'' des Resonanzabsorbers 1" gemäß Fig. 4 weist eine Vielzahl becherförmiger Hohlkammern 2 auf, die unterschiedlich groß sind und insbesondere unterschiedliche Höhen aufweisen. Die Abstandshalter 10" und 10''' umfassen hier zwei Gruppen von Abstandshaltern. Auf der ersten Gruppe von Abstandshaltern 10" ist die poröse Lage 8 in der Weise abgestützt, dass die dem Schalleinfall zugewandten Wandungsabschnitte 5" der Hohlkammern 2 keinen Kontakt zu der porösen Lage 8 haben und unabhängig von dieser schwingfähig sind. Die Abstandshalter 10" dieser Gruppe weisen vorzugsweise jeweils einen durchmesservergrößerten Kopf 23 auf, welcher der Lage 8 als Abstützfläche dient.The structural part 3 "of the resonance absorber 1" according to Figure 4 has a multiplicity of cup-shaped hollow chambers 2 of different sizes and in particular of different heights, the spacers 10 "and 10 '" comprising two groups of spacers. On the first group of spacers 10 ", the porous layer 8 is supported in such a manner that the wall sections 5" of the hollow chambers 2 facing the sound incidence have no contact with the porous layer 8 and are capable of oscillating independently thereof. The spacers 10 "of this group preferably each have an enlarged diameter head 23, which serves the layer 8 as a support surface.

Die zweite Gruppe von Abstandshaltern 10''' verringern den Abstand zwischen der porösen Lage 8 und der Basisebene 24 des Strukturteils 3" zwischen zwei Stellen 25 und 26, wo dieser Abstand größer ist. Die Abstandshalter 10''' dieser Gruppe weisen im Vergleich zu den Abstandshaltern 10" der ersten Gruppe größere, scheibenförmige Köpfe 27 auf, an deren Unterseite die Oberseite der porösen Lage 8 anliegt. Im Bereich der scheibenförmigen Köpfe 27 weist die poröse Lage 8 jeweils einen Durchbruch 28 auf, durch den der stabförmige, das Einsteckende 15 tragende Abschnitt 14''' des Abstandshalters 10"' hindurchgeführt ist. Der scheibenförmige Kopf 27 weist einen wesentlich größeren Durchmesser auf als der ihm zugeordnete Durchbruch 28 in der porösen Lage 8. Während die Abstandshalter 10" der ersten Gruppe auf Druck belastet werden, erfahren die Abstandshalter 10''' der zweiten Gruppe eine gewisse Zugbelastung.The second group of spacers 10 '''reduce the distance between the porous layer 8 and the base plane 24 of the structural part 3''between two points 25 and 26 where this distance is greater the spacers 10 "of the first group larger, disk-shaped heads 27, on the underside of the top of the porous layer 8 is applied. In the area of the disk-shaped heads 27, the porous layer 8 in each case has an opening 28, through which the rod-shaped, the insertion end 15 carrying portion 14 '''of the spacer 10''is passed. The disc-shaped head 27 has a substantially larger diameter than its associated opening 28 in the porous layer 8. While the spacers 10 "of the first group are loaded under pressure, learn the spacers 10 '''of the second group a certain tensile load.

Durch Abstandshalter 10''' der zweiten Gruppe lässt sich der Verlauf bzw. die Kontur der porösen Lage 8 relativ genau der Einhüllenden bzw. Kontur des Strukturteils 3" unter Beibehaltung von Lufträumen 9 oberhalb der dem Schalleinfall zugewandten, schwingfähigen Wandungsabschnitte 5" der Hohlkammern 2 anpassen. Dies kann insbesondere zur berührungslosen Anpassung des erfindungsgemäßen Bauteils in Bezug auf oberhalb dazu angeordnete Aggregate, beispielsweise eine Ölwanne oder einen Zylinderkopf, von Vorteil sein.By spacers 10 '' 'of the second group, the course or the contour of the porous layer 8 can be relatively exactly the envelope or contour of the structural part 3 "while maintaining air spaces 9 above the sound incidence facing vibratable wall sections 5" of the hollow chambers. 2 to adjust. This can be particularly advantageous for non-contact adaptation of the component according to the invention with respect to units arranged above it, for example an oil sump or a cylinder head.

In den Figuren 6 und 7 sind zwei Ausführungsbeispiele dargestellt, bei denen ein Resonanzabsorber 1"' einen größeren Bereich 30 aufweist, in welchem keine Hohlkammern 2 ausgebildet sind. Der Verzicht auf die Ausbildung von Hohlkammern kann durch die vorhandenen Platzverhältnisse am Einbauort bedingt sein. Beispielsweise kann ein Getriebe, eine Ölwanne oder ein anderes Aggregat den für die Ausbildung von Hohlkammern 2 erforderlichen Platz in Anspruch nehmen. In solchen Fällen kann aber gleichwohl noch die Möglichkeit bestehen, in dem nicht mit Hohlkammern belegten Bereich 30 die poröse, akustisch wirksame Lage 8 anzuordnen, um auch diesen Bereich noch für die Verringerung der auftretenden Schallemissionen zu nutzen.6 and 7 show two exemplary embodiments in which a resonance absorber 1 "'has a larger area 30 in which no hollow chambers 2 are formed For example, a gearbox, an oil sump or another aggregate may take up the space required for the formation of hollow chambers 2. In such cases, however, it may still be possible to arrange the porous, acoustically effective layer 8 in the region 30 not occupied by hollow chambers In order to use this area also for the reduction of the occurring noise emissions.

Die Luft, die zwischen der dem Schall zugewandten Außenseite des Resonanzabsorbers 1'" und der porösen Lage 8 eingeschlossen ist, wirkt zumindest bereichsweise wie eine Feder eines Feder-Masse-Systems, wobei die in den Poren der Lage 8 vorhandene Luft und/oder die schwingfähige, poröse Lage 8 selbst die Masse des Systems bildet.The air, which is enclosed between the sound-facing outside of the resonance absorber 1 '"and the porous layer 8, acts at least partially like a spring of a spring-mass system, wherein the existing in the pores of the layer 8 air and / or oscillatory, porous layer 8 itself forms the mass of the system.

Bei dem Ausführungsbeispiel gemäß Fig. 6 ist mindestens ein Abstandshalter 10''' vorgesehen, mit dem die poröse Lage 8 in dem größeren, nicht mit Hohlkammern 2 belegten Bereich 30 nahe an die Basisebene 24 bzw. Boden des Strukturteils 3''' des Resonanzabsorbers 1'" herangezogen ist.In the embodiment according to FIG. 6, at least one spacer 10 '' 'is provided, with which the porous layer 8 in the larger region 30 not occupied by hollow chambers 2 is close to the base plane 24 or bottom of the structural part 3' '' of the resonance absorber 1 '"is used.

Bei dem Ausführungsbeispiel gemäß Fig. 7 ist die poröse Lage 8 in dem größeren, nicht mit Hohlkammern 2 belegten Bereich 30 des Resonanzabsorbers 1"' bis auf dessen Oberseite heruntergeführt. Die Lage 8 und der Resonanzabsorbers 1'" können in diesem Bereich miteinander verklebt, verschweißt oder durch Befestigungsmittel (nicht gezeigt) wie Nieten, Rastelemente oder dergleichen verbunden sein.7, the porous layer 8 in the larger area 30 of the resonance absorber 1 "" not occupied by hollow chambers 2 is led down to its top side. The layer 8 and the resonance absorber 1 '"can be glued together in this area. welded or connected by fastening means (not shown) such as rivets, locking elements or the like.

Die vorstehend beschriebenen luftschallabsorbierenden Bauteile können bei Kraftfahrzeugen insbesondere als Motorraumkapselteil und/oder als Unterbodenverkleidung verwendet und entsprechend hergerichtet werden. Die poröse, luftdurchlässige Lage 8 kann dabei außenseitig partiell oder ganzflächig mit einer mikroperforierten, hitzeabschirmenden Aluminiumfolie (nicht gezeigt) kaschiert oder kleberfrei bedeckt sein. Alternativ kann die Lage 8 auch aus mehreren zu einer mikroporösen Matte zusammengepressten Lagen einer Aluminium-Wirkware bestehen, die ebenfalls hitzeabschirmend wirkt.The above-described airborne sound absorbing components can be used in motor vehicles in particular as engine compartment capsule part and / or as underbody paneling and be prepared accordingly. The porous, air-permeable layer 8 may be outside or partially over the entire surface with a microperforated, heat-shielding aluminum foil (not shown) laminated or covered without adhesive. Alternatively, the layer 8 may also consist of several to a microporous mat compressed layers of an aluminum knitted fabric, which also acts heat-shielding.

Die Erfindung ist in ihrer Ausführung nicht auf die vorstehend beschriebenen Ausführungsbeispiele beschränkt. Vielmehr sind zahlreiche Abwandlungen denkbar, die auch bei grundsätzlich abweichender Gestaltung von dem in den Ansprüchen enthaltenen Erfindungsgedanken Gebrauch machen. So können insbesondere die Merkmale der vorstehend beschriebenen Ausführungsbeispiele miteinander kombiniert werden. Auch liegt es im Rahmen der Erfindung, die Wandung einer oder mehrerer Hohlkammern 2 gegebenenfalls als Abstandshalter zu nutzen. Diese Hohlkammern haben dann praktisch eine Doppelfunktion, indem sie einerseits als Resonatoren und andererseits auch als Abstandshalter dienen.The invention is not limited in its execution to the embodiments described above. Rather, numerous modifications are conceivable that make use of the concept of the invention contained in the claims even with fundamentally different design. Thus, in particular the features of the embodiments described above can be combined. It is also within the scope of the invention to optionally use the wall of one or more hollow chambers 2 as spacers. These hollow chambers then practically have a dual function, on the one hand serving as resonators and on the other hand as spacers.

Claims (15)

  1. An airborne-sound absorbing component, in particular for motor vehicles, comprising a resonance absorber (1, 1', 1", 1"') with a plurality of differently sized hollow chambers (2) spaced apart from each other, and comprising a porous sound-absorbing layer (8) made of an air-permeable material, which layer (8) faces the incoming sound, wherein in each instance the hollow chambers (2) chambers comprise a wall section (5, 5', 5") which faces the incoming sound, characterised in that the wall sections (5, 5', 5") which face the incoming sound and are able to oscillate are closed off so as to be airtight, wherein the resonance absorber (1, 1', 1'', 1"') comprises one or several spacers (10, 10', 10", 10"') such that at least the majority of the wall sections (5, 5', 5") of the hollow chambers (2),
    which wall sections (5, 5', 5") face the incoming sound, do not establish contact with the porous layer (8) and are able to oscillate independently of said porous layer (8).
  2. The component according to claim 1, characterised in that the spacers (10, 10') are designed such that they form one piece with the resonance absorber (1).
  3. The component according to claim 1, characterised in that the spacers (10') are glued or injection-moulded to the resonance absorber (1).
  4. The component according to claim 1, characterised in that the spacers (10", 10"') are held with positive fit to the resonance absorber (1", 1"') and/or are clip-lockable.
  5. The component according to any one of claims 1 to 4, characterised in that the spacers (10, 10', 10", 10"') are arranged between hollow chambers (2) and spaced apart from these.
  6. The component according to any one of claims 1 to 5, characterised in that the spacers (10, 10', 10", 10"') have different distances from a mutual reference level which is situated on an outside or inside of the resonance absorber (1, 1', 1'', 1"').
  7. The component according to any one of claims 1 to 6, characterised in that air-filled voids, which are ensured by the spacer or spacers (10, 10', 10", 10"') between the porous layer (8) and the wall sections (5, 5', 5") of the hollow chambers (2), which wall sections (5, 5', 5") face the incoming sound and are able to oscillate, differ in height.
  8. The component according to any one of claims 1 to 7, characterised in that the porous layer (8) comprises sections which are spaced apart differently in relation to a common reference level which is situated on an outside of the resonance absorber (1").
  9. The component according to any one of claims 1 to 8, characterised in that on the outside, the porous layer (8) is covered by a micro-perforated metal foil.
  10. The component according to any one of claims 1 to 9, characterised in that the porous layer (8) is formed from several layers of knitted aluminium goods which are pressed together to form a mat.
  11. The component according to any one of claims 1 to 10, characterised in that at its margin, the porous layer (8) is connected to the resonance absorber (1, 1', 1", 1"').
  12. The component according to any one of claims 1 to 11, characterised in that a circumferential margin area of the porous layer (8) is connected to the resonance absorber (1, 1'').
  13. The component according to any one of claims 1 to 12, characterised in that the porous layer (8) is disconnectably connected to the resonance absorber (1').
  14. The component according to any one of claims 1 to 13, characterised in that the porous layer (8) has a hydrophobic finish and/or an oleophobic finish.
  15. The component according to any one of claims 1 to 14, characterised in that the porous layer (8) and the resonance absorber (1, 1', 1'', 1''') are made from plastics belonging to the same materials class.
EP04790706A 2003-12-23 2004-10-21 Component that absorbs airborne sound Not-in-force EP1697923B1 (en)

Priority Applications (1)

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PL04790706T PL1697923T3 (en) 2003-12-23 2004-10-21 Component that absorbs airborne sound

Applications Claiming Priority (2)

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DE20320100U DE20320100U1 (en) 2003-12-23 2003-12-23 Airborne sound absorbing component
PCT/EP2004/011899 WO2005066932A1 (en) 2003-12-23 2004-10-21 Component that absorbs airborne sound

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EP1697923A1 EP1697923A1 (en) 2006-09-06
EP1697923B1 true EP1697923B1 (en) 2007-12-12

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US (1) US20060169531A1 (en)
EP (1) EP1697923B1 (en)
JP (1) JP2007515340A (en)
CN (1) CN1820304A (en)
AT (1) ATE381087T1 (en)
BR (1) BRPI0406616A (en)
DE (2) DE20320100U1 (en)
ES (1) ES2297503T3 (en)
MX (1) MXPA05011254A (en)
PL (1) PL1697923T3 (en)
PT (1) PT1697923E (en)
WO (1) WO2005066932A1 (en)

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Publication number Publication date
US20060169531A1 (en) 2006-08-03
ES2297503T3 (en) 2008-05-01
EP1697923A1 (en) 2006-09-06
WO2005066932A1 (en) 2005-07-21
ATE381087T1 (en) 2007-12-15
BRPI0406616A (en) 2005-12-06
PT1697923E (en) 2008-02-25
CN1820304A (en) 2006-08-16
MXPA05011254A (en) 2005-12-14
DE20320100U1 (en) 2005-05-12
DE502004005732D1 (en) 2008-01-24
PL1697923T3 (en) 2008-05-30
JP2007515340A (en) 2007-06-14

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