EP1663717A1 - Noise absorber for the engine compartment - Google Patents

Noise absorber for the engine compartment

Info

Publication number
EP1663717A1
EP1663717A1 EP04761912A EP04761912A EP1663717A1 EP 1663717 A1 EP1663717 A1 EP 1663717A1 EP 04761912 A EP04761912 A EP 04761912A EP 04761912 A EP04761912 A EP 04761912A EP 1663717 A1 EP1663717 A1 EP 1663717A1
Authority
EP
European Patent Office
Prior art keywords
fleece
cover
engine compartment
absorber
sound absorber
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.)
Withdrawn
Application number
EP04761912A
Other languages
German (de)
French (fr)
Inventor
Alexander Wildhaber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autoneum Technologies AG
Original Assignee
Rieter Technologies AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rieter Technologies AG filed Critical Rieter Technologies AG
Publication of EP1663717A1 publication Critical patent/EP1663717A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0815—Acoustic or thermal insulation of passenger compartments
    • B60R13/083—Acoustic or thermal insulation of passenger compartments for fire walls or floors

Definitions

  • the present invention relates to a sound absorber for the engine compartment of a vehicle according to the preamble of claim 1.
  • Modern vehicles are increasingly being equipped with an acoustically effective underbody, and in particular provided with sound absorbers for the engine compartment, hereinafter also referred to as engine compartment absorbers.
  • DE 35 40 693 describes a surface resonance absorber which brings about a reduction in the sound level in the engine compartment.
  • the manufacture and assembly of such a surface resonance absorber proves to be extremely complex and expensive.
  • JP 8226061 proposes to create an acoustically effective sub-floor, which consists of a rigid carrier material, preferably of a thermoformable plastic. This carrier material is fused with a thermoplastic fiber fleece. This component is preferably used in wheel arches and has a limited and non-tunable acoustic absorption capacity.
  • Another sound-absorbing vehicle underbody is known, for example, from US 2001/0008193 A1.
  • a rigid, plate-like carrier layer is provided, which has several differently shaped cavities. These cavities can be at least partially filled with a sound-absorbing foam made of thermoplastic material.
  • This structure uses the acoustic effects of known chamber absorbers, but it also proves to be extremely complex to manufacture and cannot be easily recycled.
  • the sound-absorbing underbody panels known today are either not easily recyclable, i.e. they have to be subjected to a complex separation process for disposal or recycling, or they have insufficient acoustic effectiveness, i.e. they absorb sound energy only marginally or only in very limited frequency ranges.
  • the easily recyclable sub-floors act as narrow-band absorbers and cannot be easily coordinated.
  • these known absorbers cannot be easily installed on the vehicle floor. It is therefore an object of the present invention to provide an easily mountable engine compartment absorber which can be recycled in a simple manner, is advantageously constructed from the same basic material, and whose absorption capacity covers a wide frequency range and can be changed in a simple manner, that is to say to the conditions of a particular vehicle is easily adaptable and tunable.
  • This object is achieved according to the invention with a multi-layer engine compartment absorber, which has the features of claim 1.
  • This engine compartment absorber essentially has a less compressed support fleece and a higher compressed cover fleece, which fleeces are preferably arranged loosely one above the other and are essentially made of polypropylene fibers.
  • This fleece arrangement is encased in cover foils, which advantageously consist of the same base material as the fleece.
  • cover film which is directly connected to the underbody in a watertight manner.
  • the engineered cover fleece is more densely compressed than the base support fleece in order to bring about an acoustic spring-mass behavior.
  • the cover fleece on the engine compartment has an air flow resistance of 300 to 1200 Nsm "3.
  • the absorption behavior of the entire engine compartment absorber can be adjusted in a simple manner by the choice of the thickness of the cover foil and the choice of the type of contact with the cover fleece.
  • the cover film can lie loosely on the cover fleece or be partially glued to it.
  • polypropylene also allows the engine compartment absorber to be pressed in only in a simple manner, for example in order to produce areas with high rigidity which can be used for the direct attachment of the absorber to the engine compartment floor. By a different strength in some areas
  • Pressing can also easily adapt the acoustic behavior of the entire engine compartment absorber to the special circumstances of a particular vehicle and optimize it in the desired manner.
  • the cover film is either directly bonded to a second cover film arranged on the bottom and / or to the engine compartment floor.
  • the cover fleece preferably has a basis weight of 300 to 1200 g / m 2 and a thickness of 1 - 20 mm.
  • the cover fleece lies loosely on the support fleece.
  • Both the cover fleece and the support fleece essentially comprise polypropylene fibers.
  • the cover foils preferably have a thickness of 0.01 to 2 mm.
  • the cover film lies loosely on the cover fleece and the second cover film lies loosely on the support fleece.
  • the cover film can be partially glued to the cover fleece and the second cover film can be partially glued to the support fleece.
  • Polypropylene is particularly suitable for such cover films.
  • the cover film can equally well comprise an aluminum film and in particular be laminated with an aluminum film. It is essential that the cover fleece has an air flow resistance of 300 to 1200 Nsm "3 , preferably 700 - 900 Nsm " 3 .
  • the two fleeces ie the cover fleece and the support fleece, are pressed differently. This results in a surprisingly simple possibility of creating an inexpensive, easy-to-assemble and recyclable sound absorber.
  • Figure 1 is a schematic representation of a structure of the engine compartment absorber according to the invention.
  • FIG 3 shows a graphic representation of the absorption capacity of a second embodiment of the engine compartment absorber according to the invention.
  • the engine compartment absorber 1 shown schematically in FIG. 1 lies on a rigid engine compartment floor 7, which serves as a support and can be made of any suitable material, in particular can also be made of a plastic.
  • the engine compartment absorber 1 essentially has a pair of nonwoven fabrics covered with film.
  • a cover fleece 3 on the engine compartment side is compressed such that it has an air flow resistance of 300 to 1200 Nsm "3 , preferably 700 to 900 Nsm " 3 .
  • a support fleece 4 is arranged on the bottom, which essentially serves as a spacer (decoupler). These two fleeces 3, 4 do not need to be connected to one another and can lie loosely on one another.
  • these nonwovens are formed from polypropylene fibers and have a weight per unit area of 300 to 1200 g / m 3 .
  • these two fleeces 3, 4 are covered with a cover film 2.
  • This film 2 lies loosely on the cover fleece 3 in order to be able to act like a film absorber.
  • the cover film 2 is partially (droplet-like) glued to the cover fleece 3. This increases the stiffness 0 of the cover film 2 and improves the absorption capacity of the engine compartment absorber 1 in the low-frequency range.
  • the absorption capacity of the engine compartment absorber 1 can also be further adjusted by the choice of the material of the cover film 2 and its thickness.
  • a polypropylene film with a thickness of 0.01 to 2 mm, preferably with a thickness of 0.05 to 1 mm, is used as the cover film 2.
  • the cover film 2 is laminated with an aluminum film.
  • the engine compartment absorber 1 has a bottom-side cover film 5.
  • This cover film 5 is also made of polypropylene and can lie loosely on the support fleece 4 or can be partially glued to it.
  • the nonwoven fabrics are thus protected from dirt and moisture, for which purpose the two cover foils 2, 5 are integrally bonded to one another at least at the edge 8 of the absorber package, in particular are welded, fused or glued.
  • the two cover foils 2, 5 are integrally bonded to one another at least at the edge 8 of the absorber package, in particular are welded, fused or glued.
  • the engine-side cover sheet 2 is connected directly to the engine compartment floor 7 and the base-side cover sheet 5 can be dispensed with.
  • FIG. 2 shows the absorption behavior of the absorber according to the invention in general and in particular the frequency-dependent course of the absorption coefficient applied cover foils. Films with a thickness of 0.1 mm were used for the curve family 11, while films with a thickness of 0.05 mm were used for the family of curves 12. This figure makes it clear that the absorption maximum can be pushed into the lower frequency range by using thicker foils.
  • FIG. 3 shows the measurement curves for the absorption behavior of the same engine compartment absorber, as in FIG. 2, but with cover films partially or droplet-like glued on.
  • the curve family 13 shows the frequency-dependent course of the absorption coefficient for an engine compartment absorber according to the invention with 0.1 mm thick PE films, while the family of curves 14 shows this course with 0.05 mm thick PE films. This figure makes it clear that the absorption in the low-frequency range can be further improved by using a cover film glued to the cover fleece.
  • cover films can also consist of other plastics, in particular plastics, which can be disposed of or recycled together with the polypropylene nonwovens.
  • PET can also be used as the base material, in particular the engine compartment floor 7 can also be made from the same base material.
  • the engine compartment absorber according to the invention can also be used without further inventive addition in the wheel arch, on the vehicle front wall, or for cladding other subareas of the vehicle underbody, in particular in the area of the tunnel.

Abstract

Disclosed is a noise-absorbing part for creating an engine compartment absorber (1), comprising a covering foil (2) on the engine compartment side, which lies above a covering fleece (3) that lies above a supporting fleece (4). The covering foil (2) is connected in a bonding manner to a second covering foil (5) that is located on the bottom side and/or directly to the bottom (7) of the engine compartment. The air flow resistance of the covering fleece ranges between 300 and 1200 Nsm<-3>,< >preferably between 700 and 900 Nsm<-3>.< >

Description

Schallabsorber für den MotorraumSound absorber for the engine compartment
Die vorliegende Erfindung betrifft einen Schallabsorber für den Motorraum eines Fahrzeugs gemäss Oberbegriff des Anspruchs 1.The present invention relates to a sound absorber for the engine compartment of a vehicle according to the preamble of claim 1.
Moderne Fahrzeuge werden vermehrt mit einem akustisch wirksamen Unterboden ausgerüstet, und insbesondere mit Schallabsorbem für den Motorraum, im folgenden auch Motorraumabsorber genannt, versehen.Modern vehicles are increasingly being equipped with an acoustically effective underbody, and in particular provided with sound absorbers for the engine compartment, hereinafter also referred to as engine compartment absorbers.
Vorrichtungen zur schalldämmenden Abschottung des Motorraums eines Fahrzeuges sind seit längerem bekannt. So beschreibt beispielsweise die DE 35 40 693 einen Flächenresonanzabsorber, welcher eine Absenkung des Schallpegels im Motorraum bewirkt. Leider erweist sich die Herstellung und Montage eines derartigen Flächenresonanzabsorbers als äusserst aufwendig und teuer.Devices for soundproofing the engine compartment of a vehicle have long been known. For example, DE 35 40 693 describes a surface resonance absorber which brings about a reduction in the sound level in the engine compartment. Unfortunately, the manufacture and assembly of such a surface resonance absorber proves to be extremely complex and expensive.
In der JP 8226061 wird vorgeschlagen, einen akustisch wirksamen Unterboden zu schaffen, welcher aus einem steifen Trägermaterial, vorzugsweise aus einem wärmeformbaren Kunststoff, besteht. Dieses Trägermaterial ist mit einem thermoplastischen Faservlies verschmolzen. Dieses Bauteil wird vorzugsweise in Radkästen eingesetzt und weist ein beschränktes und nicht abstimmbares akustisches Absorptionsvermögen auf.JP 8226061 proposes to create an acoustically effective sub-floor, which consists of a rigid carrier material, preferably of a thermoformable plastic. This carrier material is fused with a thermoplastic fiber fleece. This component is preferably used in wheel arches and has a limited and non-tunable acoustic absorption capacity.
Ein anderer schallabsorbierender Fahrzeugunterboden ist beispielsweise aus der US- 2001/0008193 A1 bekannt. Bei diesem Aufbau ist eine steife, plattenartig geformte Trägerschicht vorgesehen, welche mehrere unterschiedlich geformte Kavitäten aufweist. Diese Kavitäten können mit einem schallabsorbierendem Schaum aus thermoplastischem Material mindestens teilweise gefüllt sein. Dieser Aufbau verwendet die akustischen Effekte bekannter Kammerabsorber, erweist sich aber ebenfalls als äusserst aufwendig in der Herstellung und kann nicht in einfacher Weise rezykliert werden.Another sound-absorbing vehicle underbody is known, for example, from US 2001/0008193 A1. In this construction, a rigid, plate-like carrier layer is provided, which has several differently shaped cavities. These cavities can be at least partially filled with a sound-absorbing foam made of thermoplastic material. This structure uses the acoustic effects of known chamber absorbers, but it also proves to be extremely complex to manufacture and cannot be easily recycled.
Die heute bekannten schallabsorbierenden Unterbodenverkleidungen sind alle entweder nicht in einfacher Weise rezyklierbar, d.h. sind für die Entsorgung oder Wiederverwertung einem aufwendigen Trennprozess zu unterwerfen, oder weisen eine ungenügende akustische Wirksamkeit auf, d.h. absorbieren Schallenergie nur marginal oder nur in sehr begrenzten Frequenzbereichen. Insbesondere wirken die in einfacher Weise rezyklierbaren Unterböden als Schmalbandabsorber und lassen sich nicht in einfacher Weise abstimmen. Darüber hinaus lassen sich diese bekannten Absorber auch nicht in einfacher Weise am Fahrzeugboden montieren. Es ist deshalb Aufgabe der vorliegenden Erfindung, einen einfach montierbaren Motorraumäbsorber zu schaffen, welcher in einfacher Weise rezyklierbar ist, vorteilhafterweise aus demselben Grundmaterial aufgebaut ist, und dessen Absorptionsvermögen einen weiten Frequenzbereich abdeckt und in einfacher Weise veränderbar ist, d.h. an die Gegebenheiten eines bestimmten Fahrzeugs in einfacher Weise anpassbar und abstimmbar ist.The sound-absorbing underbody panels known today are either not easily recyclable, i.e. they have to be subjected to a complex separation process for disposal or recycling, or they have insufficient acoustic effectiveness, i.e. they absorb sound energy only marginally or only in very limited frequency ranges. In particular, the easily recyclable sub-floors act as narrow-band absorbers and cannot be easily coordinated. In addition, these known absorbers cannot be easily installed on the vehicle floor. It is therefore an object of the present invention to provide an easily mountable engine compartment absorber which can be recycled in a simple manner, is advantageously constructed from the same basic material, and whose absorption capacity covers a wide frequency range and can be changed in a simple manner, that is to say to the conditions of a particular vehicle is easily adaptable and tunable.
Diese Aufgabe wird erfindungsgemäss mit einem mehrlagigen Motorraumabsorber gelöst, welcher die Merkmale des Anspruchs 1 aufweist. Dieser Motorraumabsorber weist im wesentlichen ein weniger verdichtetes Stützvlies und ein höher verdichtetes Deckvlies auf, welche Vliese vorzugsweise lose übereinander angeordnet sind und im wesentlichen aus Polypropylenfasern gefertigt sind. Diese Vliesanordnung ist in Deckfolien eingehüllt, welche vorteilhafterweise aus demselben Grundmaterial bestehen wie die Vliese. In einer anderen Ausführungsform sind diese Vliese nur von einer, direkt mit dem Unterboden wasserdicht verbundenen Deckfolie abgedeckt.This object is achieved according to the invention with a multi-layer engine compartment absorber, which has the features of claim 1. This engine compartment absorber essentially has a less compressed support fleece and a higher compressed cover fleece, which fleeces are preferably arranged loosely one above the other and are essentially made of polypropylene fibers. This fleece arrangement is encased in cover foils, which advantageously consist of the same base material as the fleece. In another embodiment, these nonwovens are only covered by a cover film which is directly connected to the underbody in a watertight manner.
Zur Erzielung einer breitbandigen Absorption ist es wesentlich, dass das motorraumseitige Deckvlies höher verdichtet ist als das bodenseitige Stützvlies, um ein akustisches Feder- Masse-Verhalten zu bewirken. Erfindungsgemäss weist das motorraumseitige Deckvlies einen Luftströmungswiderstand von 300 bis 1200 Nsm"3 auf. Darüber hinaus lässt sich, durch die Wahl der Dicke der Deckfolie und durch die Wahl der Art des Kontaktes mit dem Deckvlies, das Absorptionsverhalten des gesamten Motorraumabsorbers in einfacher Weise abstimmen. Insbesondere kann die Deckfolie lose auf dem Deckvlies aufliegen oder mit diesem partiell verklebt sein.In order to achieve broadband absorption, it is essential that the engineered cover fleece is more densely compressed than the base support fleece in order to bring about an acoustic spring-mass behavior. According to the invention, the cover fleece on the engine compartment has an air flow resistance of 300 to 1200 Nsm "3. In addition, the absorption behavior of the entire engine compartment absorber can be adjusted in a simple manner by the choice of the thickness of the cover foil and the choice of the type of contact with the cover fleece. In particular, the cover film can lie loosely on the cover fleece or be partially glued to it.
Die erfindungsgemässe Materialwahl (Polypropylen) erlaubt es darüber hinaus, den Motorraumabsorber in einfacher Weise nur lokal zu verpressen, um beispielsweise Bereiche mit einer hohen Steifigkeit zu erzeugen, welche der direkten Befestigung des Absorbers am Motorraumboden dienen können. Durch eine bereichsweise unterschiedlich starkeThe choice of material according to the invention (polypropylene) also allows the engine compartment absorber to be pressed in only in a simple manner, for example in order to produce areas with high rigidity which can be used for the direct attachment of the absorber to the engine compartment floor. By a different strength in some areas
Verpressung kann auch das akustische Verhalten des gesamten Motorraumabsorbers in einfacher Weise an die besonderen Gegebenheiten eines bestimmten Fahrzeugs angepasst und in gewünschter Weise optimiert werden.Pressing can also easily adapt the acoustic behavior of the entire engine compartment absorber to the special circumstances of a particular vehicle and optimize it in the desired manner.
Weitere vorteilhafte Ausführungsformen des erfindungsgemässen Motorraumabsorbers weisen die Merkmale der vorliegenden Unteransprüche auf. Insbesondere ist die Deckfolie entweder mit einer bodenseitig angeordneten, zweiten Deckfolie und/oder mit dem Motorraumboden direkt stoffschlüssig verbunden. Vorzugsweise weist das Deckvlies ein Flächengewicht Von 300 bis 1200 g/m2 und eine Dicke von 1 - 20 mm auf. In einer bevorzugten Ausführungsform liegt das Deckvlies lose auf dem Stützvlies. Sowohl Deckvlies als auch Stützvlies umfassen im wesentlichen Polypropylenfasern. Die Deckfolien weisen bevorzugter Weise eine Dicke von 0.01 bis 2 mm auf. In einer Weiterbildung des erfindungsgemässen Schallabsorbers liegt die Deckfolie lose auf dem Deckvlies auf und liegt die zweite Deckfolie lose an dem Stützvlies an. Dabei kann die Deckfolie partiell mit dem Deckvlies verklebt sein und die zweite Deckfolie kann partiell mit dem Stützvlies verklebt sein. Polypropylen eignet sich insbesondere für die derartigen Deckfolien. Die Deckfolie kann aber ebenso gut eine Aluminiumfolie umfassen, und insbesondere mit einer Aluminiumfolie kaschiert sein. Wesentlich ist, dass das Deckvlies einen Luftströmungswiderstand von 300 bis 1200 Nsm"3, vorzugsweise von 700 - 900 Nsm"3 aufweist. In einer Weiterbildung des erfindungsgemässen Motorraumabsorbers sind die beiden Vliese, d.h. das Deckvlies und das Stützvlies unterschiedlich verpresst. Damit ergibt sich eine überraschend einfache Möglichkeit einen kostengünstigen, einfach montierbaren und rezyklierbaren Schallabsorber zu schaffen.Further advantageous embodiments of the engine compartment absorber according to the invention have the features of the present subclaims. In particular, the cover film is either directly bonded to a second cover film arranged on the bottom and / or to the engine compartment floor. The cover fleece preferably has a basis weight of 300 to 1200 g / m 2 and a thickness of 1 - 20 mm. In a preferred embodiment, the cover fleece lies loosely on the support fleece. Both the cover fleece and the support fleece essentially comprise polypropylene fibers. The cover foils preferably have a thickness of 0.01 to 2 mm. In a further development of the sound absorber according to the invention, the cover film lies loosely on the cover fleece and the second cover film lies loosely on the support fleece. The cover film can be partially glued to the cover fleece and the second cover film can be partially glued to the support fleece. Polypropylene is particularly suitable for such cover films. However, the cover film can equally well comprise an aluminum film and in particular be laminated with an aluminum film. It is essential that the cover fleece has an air flow resistance of 300 to 1200 Nsm "3 , preferably 700 - 900 Nsm " 3 . In a further development of the engine compartment absorber according to the invention, the two fleeces, ie the cover fleece and the support fleece, are pressed differently. This results in a surprisingly simple possibility of creating an inexpensive, easy-to-assemble and recyclable sound absorber.
Im folgenden soll die Erfindung mit Hilfe von Ausführungsbeispielen und an Hand der Figuren näher beschrieben werden. Es zeigen:The invention will be described in more detail below with the aid of exemplary embodiments and with reference to the figures. Show it:
Fig. 1 eine schematische Darstellung eines Aufbaus des erfindungsgemässen Motorraumabsorbers;Figure 1 is a schematic representation of a structure of the engine compartment absorber according to the invention.
Fig. 2 eine graphische Darstellung des Absorptionsvermögens einer ersten Ausführungsform des erfindungsgemässen Motorraumabsorbers; und2 shows a graphical representation of the absorption capacity of a first embodiment of the engine compartment absorber according to the invention; and
Fig. 3 eine graphische Darstellung des Absorptionsvermögens einer zweiten Ausführungsform des erfindungsgemässen Motorraumabsorbers.3 shows a graphic representation of the absorption capacity of a second embodiment of the engine compartment absorber according to the invention.
Der in Figur 1 schematische dargestellte Motorraumabsorber 1 liegt auf einem steifen Motorraumboden 7, welcher als Träger dient und aus jedem geeignetem Material bestehen kann, insbesondere auch aus einem Kunststoff gefertigt sein kann. Der Motorraumabsorber 1 weist im wesentlichen ein mit Folie umhülltes Faservliespaar auf. Dabei ist ein motorraumseitiges Deckvlies 3 derart verdichtet, dass dieses einen Lufströmungswiderstand von 300 bis 1200 Nsm"3, vorzugsweise von 700 bis 900 Nsm"3 aufweist. Bodenseitig ist ein Stützvlies 4 angeordnet, welches im wesentlichen als Abstandshalter (Decoupler) dient. Diese beiden Vliese 3, 4 brauchen nicht miteinander verbunden zu sein und können lose auf einander liegen. Erfindungsgemäss sind diese Vliese aus Polypropylenfasern gebildet und weisen ein Flächengewicht von 300 bis 1200 g/m3 auf.The engine compartment absorber 1 shown schematically in FIG. 1 lies on a rigid engine compartment floor 7, which serves as a support and can be made of any suitable material, in particular can also be made of a plastic. The engine compartment absorber 1 essentially has a pair of nonwoven fabrics covered with film. A cover fleece 3 on the engine compartment side is compressed such that it has an air flow resistance of 300 to 1200 Nsm "3 , preferably 700 to 900 Nsm " 3 . A support fleece 4 is arranged on the bottom, which essentially serves as a spacer (decoupler). These two fleeces 3, 4 do not need to be connected to one another and can lie loosely on one another. According to the invention, these nonwovens are formed from polypropylene fibers and have a weight per unit area of 300 to 1200 g / m 3 .
5 Motorraumseitig sind diese beiden Vliese 3, 4 mit einer Deckfolie 2 abgedeckt. Diese Folie 2 liegt lose auf dem Deckvlies 3 auf, um in der Art eines Folienabsorbers wirken zu können.5 On the engine compartment side, these two fleeces 3, 4 are covered with a cover film 2. This film 2 lies loosely on the cover fleece 3 in order to be able to act like a film absorber.
In einer anderen Ausführungsform des erfindungsgemässen Motorraumabsorbers 1 ist die Deckfolie 2 partiell (tröpfchenartig) mit dem Deckvlies 3 verklebt. Dadurch wird die Steifigkeit 0 der Deckfolie 2 erhöht und das Absorptionsvermögen des Motorraumabsorbers 1 im niederfrequenten Bereich verbessert. Das Absorptionsvermögen des Motorraumabsorbers 1 kann auch durch die Wahl des Materials der Deckfolie 2 und deren Dicke weiter abgestimmt werden.In another embodiment of the engine compartment absorber 1 according to the invention, the cover film 2 is partially (droplet-like) glued to the cover fleece 3. This increases the stiffness 0 of the cover film 2 and improves the absorption capacity of the engine compartment absorber 1 in the low-frequency range. The absorption capacity of the engine compartment absorber 1 can also be further adjusted by the choice of the material of the cover film 2 and its thickness.
5 Erfindungsgemäss wird als Deckfolie 2 eine Polypropylenfolie mit einer Dicke von 0.01 bis 2 mm, vorzugsweise mit einer Dicke von 0.05 bis 1 mm verwendet. In einer Weiterbildung des erfindungsgemässen Motorraumabsorbers ist die Deckfolie 2 mit einer Alufolie kaschiert.5 According to the invention, a polypropylene film with a thickness of 0.01 to 2 mm, preferably with a thickness of 0.05 to 1 mm, is used as the cover film 2. In a development of the engine compartment absorber according to the invention, the cover film 2 is laminated with an aluminum film.
Darüber hinaus weist der erfindungsgemässe Motorraumabsorber 1 eine bodenseitige !0 Deckfolie 5 auf. Auch diese Deckfolie 5 ist aus Polypropylen gefertigt und kann lose am Stützvlies 4 anliegen oder kann mit diesem partiell verklebt sein.In addition, the engine compartment absorber 1 according to the invention has a bottom-side cover film 5. This cover film 5 is also made of polypropylene and can lie loosely on the support fleece 4 or can be partially glued to it.
Um das akustische Verhalten des erfindungsgemässen Motorraumabsorbers zu verbessern wird auf diesen eine Folie aufgelegt. Diese aufgelegten Folien führen zu zusätzlichenIn order to improve the acoustic behavior of the engine compartment absorber according to the invention, a film is placed thereon. These foils lead to additional ones
.5 dissipativen Effekten, insbesondere akustisch wirksamen Nahfeldeffekten. Darüberhinaus werden damit die Faservliese vor Verschmutzung und Feuchtigkeit geschützt, wozu die beiden Deckfolien 2, 5 mindestens am Rand 8 des Absorberpakets miteinander stoffschlüssig verbunden werden, insbesondere verschweisst, verschmolzen oder verklebt werden. Zur Befestigung des Motorraumabsorbers 1 am Motorraumboden 7 können lokale.5 dissipative effects, especially acoustically effective near-field effects. In addition, the nonwoven fabrics are thus protected from dirt and moisture, for which purpose the two cover foils 2, 5 are integrally bonded to one another at least at the edge 8 of the absorber package, in particular are welded, fused or glued. To attach the engine compartment absorber 1 to the engine compartment floor 7, local
30 Verpressungen vorgesehen sein, welche Bereiche mit einer für eine langlebige Befestigung erforderliche Steifigkeit bilden, in denen geeignete Befestigungszapfen 9 angebracht sein können. In einer besonderen Ausführungsform wird die motorraumseitige Deckfolie 2 direkt mit dem Motorraumboden 7 verbunden und kann auf die bodenseitige Deckfolie 5 verzichtet werden.30 pressings are provided, which form areas with a rigidity required for long-lasting fastening, in which suitable fastening pins 9 can be attached. In a special embodiment, the engine-side cover sheet 2 is connected directly to the engine compartment floor 7 and the base-side cover sheet 5 can be dispensed with.
35 Figur 2 zeigt das Absorptionsverhalten des erfindungsgemässen Absorbers im allgemeinen und im besonderen den frequenzabhängigen Verlauf des Absorptionskoeffizienten mit aufgelegten Deckfolien. Bei der Kurvenschar 11 wurden jeweils Folien mit einer Dicke von 0.1 mm verwendet, während bei der Kurvenschar 12 Folien mit einer Dicke von 0.05 mm verwendet wurden. Diese Figur macht deutlich, dass durch die Verwendung von dickeren Folien das Absorptionsmaximum in den tieferfrequenten Bereich geschoben werden kann.FIG. 2 shows the absorption behavior of the absorber according to the invention in general and in particular the frequency-dependent course of the absorption coefficient applied cover foils. Films with a thickness of 0.1 mm were used for the curve family 11, while films with a thickness of 0.05 mm were used for the family of curves 12. This figure makes it clear that the absorption maximum can be pushed into the lower frequency range by using thicker foils.
Figur 3 zeigt die Messkurven für das Absorptionsverhalten desselben Motorraumabsorbers, wie in Figur 2, jedoch mit partiell bzw. tröpfchenartig aufgeklebten Deckfolien. Die Kurvenschar 13 zeigt den frequenzabhängigen Verlauf des Absorptionskoeffizienten für einen erfindungsgemässen Motorraumabsorber mit 0.1 mm dicken PE-Folien, während die Kurvenschar 14 diesen Verlauf mit 0.05 mm dicken PE-Folien zeigt. Diese Figur macht deutlich, dass durch die Verwendung einer mit dem Deckvlies verkleben Deckfolie die Absorption im tieffrequenten Bereich weiter verbessert werden kann.FIG. 3 shows the measurement curves for the absorption behavior of the same engine compartment absorber, as in FIG. 2, but with cover films partially or droplet-like glued on. The curve family 13 shows the frequency-dependent course of the absorption coefficient for an engine compartment absorber according to the invention with 0.1 mm thick PE films, while the family of curves 14 shows this course with 0.05 mm thick PE films. This figure makes it clear that the absorption in the low-frequency range can be further improved by using a cover film glued to the cover fleece.
Die Vorteile des erfindungsgemässen Motorraumabsorbers sind dem Fachmann unmittelbar ersichtlich und insbesondere in dessen vollständiger Rezyklierbarkeit, dessen akustischer Abstimmbarkeit und dessen einfacher Montierbarkeit zu sehen.The advantages of the engine compartment absorber according to the invention are immediately apparent to the person skilled in the art and, in particular, can be seen in its complete recyclability, its acoustic tunability and its ease of assembly.
Es versteht sich für den Fachmann, dass die Deckfolien auch aus anderen Kunststoffen bestehen können, insbesondere aus Kunststoffen, welche mit den Polypropylenvliesen gemeinsam entsorgt bzw. rezykliert werden können. In einer Weiterbildung des erfindungsgemässen Motorraumabsorbers kann als Grundmaterial auch PET verwendet werden, insbesondere kann der Motorraumboden 7 ebenfalls aus demselben Grundmaterial gefertigt sein.It is understood by the person skilled in the art that the cover films can also consist of other plastics, in particular plastics, which can be disposed of or recycled together with the polypropylene nonwovens. In a further development of the engine compartment absorber according to the invention, PET can also be used as the base material, in particular the engine compartment floor 7 can also be made from the same base material.
Der erfindungsgemässe Motorraumabsorber lässt sich ohne weiteres erfinderisches Dazutun auch im Radkasten, an der Fährzeugstirnwand, oder zur Verkleidung von anderen Teilbereichen des Fahrzeugunterbodens, insbesondere im Bereich des Tunnels, verwenden. The engine compartment absorber according to the invention can also be used without further inventive addition in the wheel arch, on the vehicle front wall, or for cladding other subareas of the vehicle underbody, in particular in the area of the tunnel.

Claims

Ansprüche: Expectations:
1. Schallabsorber (1) für die Verwendung mit einem Motorraumboden (7), dadurch gekennzeichnet, dass dieser Motorraumabsorber (1) motorraumseitig eine Deckfolie (2) aufweist, welche über einem Deckvlies (3) liegt, welches Deckvlies (3) über einem Stützvlies (4) liegt, wobei die Deckfolie (2) entweder mit einer bodenseitig angeordneten, zweiten Deckfolie (5) und/oder mit dem Motorraumboden (7) stoffschlüssig verbunden ist. 1. Sound absorber (1) for use with an engine compartment floor (7), characterized in that this engine compartment absorber (1) on the engine compartment side has a cover film (2) which lies over a cover fleece (3), which cover fleece (3) over a support fleece (4) lies, wherein the cover film (2) is either integrally connected to a second cover film (5) arranged on the bottom and / or to the engine compartment floor (7).
2. Schallabsorber (1) nach Anspruch 1 , dadurch gekennzeichnet, dass das Deckvlies (3) ein Flächengewicht von 300 bis 1200 g/m2 und eine Dicke von 1 - 20 mm aufweist.2. Sound absorber (1) according to claim 1, characterized in that the cover fleece (3) has a basis weight of 300 to 1200 g / m 2 and a thickness of 1 - 20 mm.
3. Schallabsorber (1) nach Anspruch 1 , dadurch gekennzeichnet, dass das Stützvlies (4) ein Flächengewicht von 300 bis 1200 g/m2 und eine Dicke von 1 - 20 mm aufweist.3. Sound absorber (1) according to claim 1, characterized in that the supporting fleece (4) has a basis weight of 300 to 1200 g / m 2 and a thickness of 1 - 20 mm.
4. Schallabsorber (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Deckvlies (3) und das Stützvlies (4) lose auf einander liegen.4. Sound absorber (1) according to one of the preceding claims, characterized in that the cover fleece (3) and the support fleece (4) lie loosely on one another.
5. Schallabsorber (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sowohl das Deckvlies (3) als auch das Stützvlies (4) Polypropylenfasern umfassen.5. Sound absorber (1) according to one of the preceding claims, characterized in that both the cover fleece (3) and the support fleece (4) comprise polypropylene fibers.
6. Schallabsorber (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Deckfolien (2, 5) eine Dicke von 0.01 bis 2 mm aufweisen. 6. Sound absorber (1) according to one of the preceding claims, characterized in that the cover foils (2, 5) have a thickness of 0.01 to 2 mm.
7. Schallabsorber (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Deckfolie (2) lose auf dem Deckvlies (3) aufliegt und die zweite Deckfolie (5) lose an dem Stützvlies (4) anliegt.7. Sound absorber (1) according to one of the preceding claims, characterized in that the cover film (2) lies loosely on the cover fleece (3) and the second cover film (5) lies loosely on the support fleece (4).
8. Schallabsorber (1) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Deckfolie (2) partiell mit dem Deckvlies (3) verklebt ist und die zweite Deckfolie (5) partiell mit dem Stützvlies (4) verklebt ist. 8. Sound absorber (1) according to one of claims 1 to 6, characterized in that the cover film (2) is partially glued to the cover fleece (3) and the second cover film (5) is partially glued to the support fleece (4).
. Schallabsorber (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Deckfolien (2, 5) vorzugsweise Polypropylenfolien sind., Sound absorber (1) according to one of the preceding claims, characterized in that the cover foils (2, 5) are preferably polypropylene foils.
10. Schallabsorber (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Deckfolie (2) eine Aluminiumfolie umfasst, insbesondere mit einer Aluminiumfolie kaschiert ist .10. Sound absorber (1) according to one of the preceding claims, characterized in that the cover film (2) comprises an aluminum film, in particular is laminated with an aluminum film.
11. Schallabsorber (1 ) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Deckvlies (3) einen Luftströmungswiderstand von 300 bis 1200 Nsm"3, vorzugsweise von 700 bis 900 Nsm"3 aufweist.11. Sound absorber (1) according to one of the preceding claims, characterized in that the cover fleece (3) has an air flow resistance of 300 to 1200 Nsm "3 , preferably from 700 to 900 Nsm " 3 .
12. Schallabsorber (1) nach einem der Ansprüche 1 bis 11 , dadurch gekennzeichnet, dass dieser partiell unterschiedlich verpresst ist. 12. Sound absorber (1) according to one of claims 1 to 11, characterized in that it is partially pressed differently.
EP04761912A 2003-09-11 2004-09-11 Noise absorber for the engine compartment Withdrawn EP1663717A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20314166U DE20314166U1 (en) 2003-09-11 2003-09-11 Engine compartment absorber
PCT/CH2004/000572 WO2005023594A1 (en) 2003-09-11 2004-09-11 Noise absorber for the engine compartment

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EP1663717A1 true EP1663717A1 (en) 2006-06-07

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DE (1) DE20314166U1 (en)
WO (1) WO2005023594A1 (en)

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WO2005023594A1 (en) 2005-03-17

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