EP1663717A1 - Isolant acoustique pour compartiment moteur - Google Patents

Isolant acoustique pour compartiment moteur

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Withdrawn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)
English (en)
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/fr
Withdrawn legal-status Critical Current

Links

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.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un composant isolant acoustique qui constitue un isolant pour compartiment moteur (1). Ce composant présente un film de revêtement (2), côté compartiment moteur, qui repose sur un non-tissé de revêtement (3) reposant lui-même sur un non-tissé de support (4). Le film de revêtement (2) est relié avec un second film de revêtement (5) situé côté fond et/ou directement au fond (7) du compartiment moteur par liaison de matière. La résistance à l'écoulement d'air du non-tissé de revêtement est située entre 300 et 1200 Nsm<-3>, de préférence entre 700 et 900 Nsm<-3>.
EP04761912A 2003-09-11 2004-09-11 Isolant acoustique pour compartiment moteur Withdrawn EP1663717A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20314166U DE20314166U1 (de) 2003-09-11 2003-09-11 Motorraumabsorber
PCT/CH2004/000572 WO2005023594A1 (fr) 2003-09-11 2004-09-11 Isolant acoustique pour compartiment moteur

Publications (1)

Publication Number Publication Date
EP1663717A1 true EP1663717A1 (fr) 2006-06-07

Family

ID=29433024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04761912A Withdrawn EP1663717A1 (fr) 2003-09-11 2004-09-11 Isolant acoustique pour compartiment moteur

Country Status (3)

Country Link
EP (1) EP1663717A1 (fr)
DE (1) DE20314166U1 (fr)
WO (1) WO2005023594A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1737706A1 (fr) * 2004-04-21 2007-01-03 Etis AG Isolation
DE102005013311A1 (de) * 2005-03-22 2006-10-05 Federal-Mogul Sealing Systems Gmbh Abschirmelement für Kraftfahrzeuge
PL1710126T3 (pl) * 2005-04-04 2009-09-30 Rieter Tech Ag Uszczelniony, cienki, wielowarstwowy pochłaniacz dźwięku
DE202006001654U1 (de) * 2006-02-02 2006-03-30 Rieter Technologies Ag Schallabsorbierendes Isolationsteil mit Verfestigungsprägungen
FR2901209B1 (fr) * 2006-05-22 2009-03-06 Cera Ecran d'insonorisation sur moteur forme a base de materiau poreux
DE202006009245U1 (de) * 2006-06-09 2007-10-11 Carcoustics Tech Center Gmbh Luftschall absorbierende Motorraumverkleidung für Kraftfahrzeuge, insbesondere Motorhaubenverkleidung
EP1955899A1 (fr) 2007-02-12 2008-08-13 Rieter Technologies AG Amortissement de couches contraintes pour véhicule
EP4201749A1 (fr) * 2021-12-21 2023-06-28 Autoneum Management AG Pièce de garniture de soubassement pour véhicule routier

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387822A1 (fr) * 1977-04-21 1978-11-17 Matec Holding Perfectionnements aux elements d'insonorisation pour compartiments de moteurs de vehicules et aux compartiments equipes de tels elements
JPS58177781A (ja) * 1982-04-13 1983-10-18 Yamakawa Kogyo Kk 自動車のエンジンアンダ−カバ−
DE3540693A1 (de) 1985-11-16 1987-05-21 Opel Adam Ag Schalldaemmende vorrichtung zur abschottung des motorraums eines kraftfahrzeugs
DE3601204A1 (de) * 1986-01-17 1987-07-23 Daimler Benz Ag Geraeuschdaemmende verkleidung fuer den motorraum von kraftfahrzeugen
JPH08226061A (ja) 1995-02-20 1996-09-03 Kobe Steel Ltd 繊維強化樹脂積層成形品およびその製法
EP0905762A1 (fr) 1997-09-30 1999-03-31 STMicroelectronics S.r.l. Procédé pour enlever les résidus de moulage dans la fabrication des empaquetages en matiére plastique pour des dispositifs semi-conducteurs
DE29803674U1 (de) * 1998-03-03 1999-07-15 Faist M Gmbh & Co Kg Schichtstoff
US6296075B1 (en) * 2000-06-02 2001-10-02 Lear Corporation Lightweight acoustical system
US20030124314A1 (en) * 2001-12-31 2003-07-03 Michael Rajendran S. Structurally enhanced sound and heat energy absorbing liner and related method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005023594A1 *

Also Published As

Publication number Publication date
DE20314166U1 (de) 2003-11-06
WO2005023594A1 (fr) 2005-03-17

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