US20080245608A1 - Element For Sound Insulation - Google Patents

Element For Sound Insulation Download PDF

Info

Publication number
US20080245608A1
US20080245608A1 US11/913,909 US91390906A US2008245608A1 US 20080245608 A1 US20080245608 A1 US 20080245608A1 US 91390906 A US91390906 A US 91390906A US 2008245608 A1 US2008245608 A1 US 2008245608A1
Authority
US
United States
Prior art keywords
element according
sound
thermoplastic material
glass fiber
sound insulation
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.)
Abandoned
Application number
US11/913,909
Other languages
English (en)
Inventor
Thomas Freser-Wolzenburg
Manfred Hoffmann
Ulrich Milbradt
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.)
Dr Alois Stankiewicz GmbH
Original Assignee
Dr Alois Stankiewicz GmbH
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 Dr Alois Stankiewicz GmbH filed Critical Dr Alois Stankiewicz GmbH
Assigned to STANKIEWICZ GMBH reassignment STANKIEWICZ GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FRESER-WOLZENBURG, THOMAS, HOFFMANN, MANFRED, MILBRADT, ULRICH
Publication of US20080245608A1 publication Critical patent/US20080245608A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • B60R13/0861—Insulating elements, e.g. for sound insulation for covering undersurfaces of vehicles, e.g. wheel houses
    • 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

Definitions

  • the invention discloses an element for sound insulation which forms the external completion of a housing-like structure excited to oscillations, in which there is located at least one sound emitter, which element is formed of a shaped thermoplastic material, which is reinforced by means of a glass fiber component of more than 35 weight percent.
  • the present invention relates to an element for sound insulation which forms the external completion of a housing-like structure excited to oscillations, in which at least one sound emitter is located.
  • This element for sound insulation is suited for example in particular as underbody covering for motor vehicles, such as motor cars.
  • Underbody coverings for motor vehicles serve on the one hand for improving the aerodynamics of the underbody, and on the other hand for sound insulation or sound damping. This sound protection is of significance in particular in the case of diesel motors, since these give rise to strong motor noises, whereby in many cases maximum permissible noise emissions are exceeded.
  • WO 04/089592 A2 describes a method for the production of a two-part roof covering for vehicles, which distinguishes itself through very good characteristics with regard to the damping of a head impact on the roof covering and through sound damping.
  • the damping material may be glass fiber reinforced polypropylene.
  • the roof covering is of a first part, which forms the side visible to the passenger compartment and a second part, towards the roof, and serves for mechanical reinforcement.
  • the two parts are formed in different tools and connected with one another in accordance with conventional processes, such as for example by means of the employment of hot melt adhesives.
  • the roof covering is so attached to the bodywork roof that there arises a hollow chamber between the covering and the roof, through which the sound dampening is attained.
  • the present invention relates to an element for sound insulation which forms the external completion of a housing-like structure excited to oscillations, in which at least one sound emitter is located, which is characterized in that it is of a shaped thermoplastic material, which is reinforced by means of a glass fiber component of more than 35 weight percent.
  • FIG. 1 a diagram for assessment of the airborne sound damping of a sound insulation element in accordance with the invention and a conventional element;
  • FIG. 2 an arrangement for measurement of airborne sound damping
  • FIG. 3 a diagram for the assessment of the equivalent absorption area of an element in accordance with the invention in comparison with known sound insulation elements.
  • the element in accordance with the invention has a relatively high proportion of the glass fibers of more than 35 weight percent, whereby the glass fiber proportion may be up to 65 weight percent.
  • the glass fiber proportion may be up to 65 weight percent.
  • one employs relatively long cut glass fibers having a length of at least 1 cm, which are surrounded with a thermoplastic plastic material.
  • thermoplastic material of the element for sound insulation in accordance with the invention is normally a polyolefin.
  • the polyolefin is selected from the group polyethylene, polypropylene, derivates thereof and/or mixtures thereof, wherein a thermoplastic material of polypropylene is particularly preferred.
  • the element for sound insulation in accordance with the invention is in one part and is as such airborne sound absorbing without, as is usual in the state of the art, having to be provided with apertures.
  • the element for sound insulation is also airborne sound damping in such quality that it compensates for the degradation in the degree of sound damping resulting, theoretically, from the difference in weight per unit area referred to conventional sound insulation elements.
  • the element for sound insulation in accordance with the invention may be present preferably in the form of a plate or shell.
  • an airborne sound absorbing underbody covering is formed by in one piece of a uniform plate of the element for sound insulation in accordance with the invention to thicknesses between 5 and 10 mm.
  • the moulding in the tool is effected under pressure and/or vacuum and heat in accordance with conventional processes in such a manner that on the one hand the structurally required shaping is produced and on the other hand by means of pressing to locally different thicknesses an optimal airborne sound absorption behaviour, adapted to the engine compartment noise, is attained.
  • an increase of the values of the airborne sound absorption can be attained by means of lamination of conventionally available foils, in particular by means of foils having a weight per unit area in the range of 100 g/m 2 to 150 g/m 2 .
  • the element for sound insulation has extremely high flexural strength and thus allows a compression at the edges of up to about 2 mm, so that optimal prerequisites for installation at the housing-like structure are provided. Despite this slight thickness, the attachment holes do not tear.
  • the housing-like structure is of a plastic or sheet metal.
  • the minimum spacing of the element forming the external completion to the at least one sound emitter within the housing-like structure, and the maximum spacing, are normally predetermined by the structure.
  • the sound emitter may be an engine.
  • a plate-like element for sound insulation is formed to a moulded part and at least on one side, preferably on the outside, is provided with a foil lamination, expediently, for reasons of recycling, with a polyolefin non-woven material, in particular polypropylene non-woven material.
  • the element in accordance with the invention is employed as underbody covering for motor vehicles.
  • the shell-like underbody covering formed of a plate has, due to its composite structure, airborne sound absorbing characteristics, whereby the conventionally usual supplementary absorbers on the inner side of the covering can be omitted.
  • the conventionally usual supplementary absorbers on the inner side of the covering can be omitted.
  • the underbody covering brings about not only a reduction of the noise in the passenger compartment but also with regard to external noise.
  • the high flexural strength, or the high modulus of elasticity in the range between 0.8 ⁇ 10 9 and 2 ⁇ 10 9 N/m 2 , allows a compression, brought about by pressing under heat, at the edge zones of up to about 2 mm through which optimal prerequisites for the attachment to the bodywork with only a few points are provided, so that also the holes needed for the attachment do not tear.
  • the element for sound insulation in accordance with the invention in particular an underbody covering for example for motor vehicles, distinguishes itself through an extremely high flexural strength with a very slight weight per unit area and favourable airborne sound absorbing characteristics, whereby a supplementary airborne sound absorber applied on the inside to the shaped part can be omitted.
  • the exterior noise, to the street side, and at engine compartment side is significantly reduced, whereby at the same time the noise in the passenger compartment is lowered.
  • the reduced airborne sound damping to be expected, in comparison with conventional elements for sound insulation, due to the weight reduction, is compensated by means of the airborne sound absorbing characteristics of the element, without further measures.
  • the underbody covering is of glass fiber reinforced poly propylene with non-woven material covering to both sides.
  • This underbody covering was compared in a test series for determination of the airborne sound damping, with a mass produced, conventional underbody covering. These measurements were effected in a modified sound damping test station which made possible measurements on original parts, which usually in terms of area are considerably smaller than required in accordance with DIN measurements. Such a device is illustrated in FIG. 2 .
  • test parts As shown in FIG. 2 , where mounted with 40 mm spacing before a steel sheet, which was fitted into a frame having very high sounds damping (mask). Through this it was attained that airborne sound generated in the transmission chamber can arrive at the receiving chamber exclusively via the test surface.
  • the sound damping of an underbody covering in accordance with the invention and of a conventional underbody covering were measured in dB in dependence upon the third octave band middle frequency (Hz).
  • the measurement values and the curves resulting therefrom are shown in FIG. 1 .
  • the conventional underbody covering “series”, characterized by curve 1 had a weight of 1170 g compared with a “light underbody covering” in accordance with the invention, designated by curve 2 , having a part weight of 881 g.
  • a light underbody covering A in accordance with the invention polypropylene-glass fiber reinforced, absorbing on both sides with a mass of 645 g, a mixed fiber non-wover underbody covering B (absorbing on both sides with a mass of 1151 g), an underbody covering “series” C having airborne sound absorbing elements (“non-woven in foil”, additional weight approximately 190 g) and an underbody covering “series” D having a weight of 1170 g.
  • the parts were mounted at a spacing of 20 cm from the floor in the alpha cabin in order to realistically simulate the installation situation in a vehicle.
  • the underside corresponds to the carriageway side to the floor.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Body Structure For Vehicles (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
US11/913,909 2005-05-09 2006-05-09 Element For Sound Insulation Abandoned US20080245608A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005021299.9 2005-05-09
DE102005021299A DE102005021299A1 (de) 2005-05-09 2005-05-09 Element zur Schallisolation
PCT/EP2006/004326 WO2006119963A2 (en) 2005-05-09 2006-05-09 Element for sound insulation

Publications (1)

Publication Number Publication Date
US20080245608A1 true US20080245608A1 (en) 2008-10-09

Family

ID=36636923

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/913,909 Abandoned US20080245608A1 (en) 2005-05-09 2006-05-09 Element For Sound Insulation

Country Status (7)

Country Link
US (1) US20080245608A1 (de)
EP (1) EP1879771A2 (de)
JP (1) JP2008543625A (de)
KR (1) KR20080009678A (de)
DE (1) DE102005021299A1 (de)
WO (1) WO2006119963A2 (de)
ZA (1) ZA200707468B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011120970A1 (de) * 2011-12-13 2013-03-14 Daimler Ag Faserverstärktes Verbundbauteil und Verfahren zur konstruktiven Auslegung eines akustikgerechten faserverstärkten Verbundbauteils

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4966799A (en) * 1986-09-26 1990-10-30 Matec Holding Ag Noise-reducing structural element

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3841560A1 (de) * 1988-12-11 1990-06-13 Friedrich Weigel Formplatte und formteile fuer den einsatz im automobilbau sowie verfahren zu deren herstellung
EP0631862A1 (de) * 1993-06-01 1995-01-04 General Electric Company Flugzeug-Innenpaneele
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
JP2000257442A (ja) * 1999-03-04 2000-09-19 Idemitsu Petrochem Co Ltd 自動車エンジンルーム内用軽量樹脂成形品およびその製造方法
DE19920969B4 (de) * 1999-05-06 2005-07-21 Faist Automotive Gmbh & Co. Kg Einbau- oder Verkleidungsteil mit schalldämmenden und/oder schalldämpfenden Eigenschaften
DE20000969U1 (de) * 2000-01-21 2000-05-04 Asglawo Gmbh Stoffe Zum Daemme Material zur Wärme- und Schalldämmung
US7157034B2 (en) * 2003-04-03 2007-01-02 Azdel, Inc. Twin-sheet thermoforming process

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4966799A (en) * 1986-09-26 1990-10-30 Matec Holding Ag Noise-reducing structural element

Also Published As

Publication number Publication date
WO2006119963A2 (en) 2006-11-16
DE102005021299A1 (de) 2006-11-16
ZA200707468B (en) 2008-12-31
EP1879771A2 (de) 2008-01-23
KR20080009678A (ko) 2008-01-29
WO2006119963A3 (en) 2007-09-20
JP2008543625A (ja) 2008-12-04

Similar Documents

Publication Publication Date Title
US8636105B2 (en) Automotive insulating trim part
US8863897B2 (en) Automotive noise attenuating trim part
US6145617A (en) Ultra-light, multifunctional sound-insulating kit
EP1682385B1 (de) Schalldämpfungssystem
US20060246799A1 (en) Sound attenuating/absorbing laminates and methods of making same
KR101550234B1 (ko) 차음 및 흡음을 위한 자동차 트림 부품
KR101624256B1 (ko) 자동차 방음 트림 부품
US6971475B2 (en) Vehicle trim components with selectively applied foam and methods of making same
US6820720B1 (en) Sound-absorbing article effective over a broad frequency range
EP1652730B1 (de) Schalldämmende Abdeckung
GB2401577A (en) Accoustically attenuating headliner
KR100474154B1 (ko) 광주파수 대역에 걸쳐 흡음 효과가 탁월한 컴포넌트 파트
JP4215146B2 (ja) 自動車用インシュレータ
US11186236B2 (en) Sheet for interior or exterior materials for automobiles and method for producing same
US20080245608A1 (en) Element For Sound Insulation
US20110285178A1 (en) Acoustically absorptive vehicle headliner
CN101177131B (zh) 一种隔声吸能的前仓结构及其制造方法
CN213619631U (zh) 汽车轻量化前围隔音垫及汽车
Davies Current and past technologies for headliners including acoustics, recycling and safety
KR900000956Y1 (ko) 자동차의 소음 방지재
JP2005075012A (ja) 車両用防音材
GB2347118A (en) A motor vehicle bulkhead and method of forming such a bulkhead
KR19980030404U (ko) 자동차 엔진후드의 흡음구조
KR20050116670A (ko) 자동차용흡음재

Legal Events

Date Code Title Description
AS Assignment

Owner name: STANKIEWICZ GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FRESER-WOLZENBURG, THOMAS;HOFFMANN, MANFRED;MILBRADT, ULRICH;REEL/FRAME:020996/0775

Effective date: 20080509

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION