WO2007036440A1 - Garniture d'isolation acoustique conçue pour le soubassement de vehicules automobiles - Google Patents

Garniture d'isolation acoustique conçue pour le soubassement de vehicules automobiles Download PDF

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Publication number
WO2007036440A1
WO2007036440A1 PCT/EP2006/066394 EP2006066394W WO2007036440A1 WO 2007036440 A1 WO2007036440 A1 WO 2007036440A1 EP 2006066394 W EP2006066394 W EP 2006066394W WO 2007036440 A1 WO2007036440 A1 WO 2007036440A1
Authority
WO
WIPO (PCT)
Prior art keywords
soft
underbody
relatively hard
wall
hollow body
Prior art date
Application number
PCT/EP2006/066394
Other languages
German (de)
English (en)
Inventor
Heiko Klein
Eduard Brück
Original Assignee
Carcoustics Techconsult 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 Carcoustics Techconsult Gmbh filed Critical Carcoustics Techconsult Gmbh
Publication of WO2007036440A1 publication Critical patent/WO2007036440A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining
    • B62D35/02—Streamlining the undersurfaces
    • 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
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses

Definitions

  • the invention relates to a sound-insulating underbody paneling for motor vehicles, with a hollow body made of plastic, the underside of which is designed to reduce air resistance and / or substantially smooth-surfaced.
  • underbody linings are known, for example, from EP 1 251 062 A2 and DE 100 01 932 A1. They serve to reduce the sound level in the passenger compartment and to improve the cW value of the respective motor vehicle.
  • EP 1 251 062 A2 underbody paneling has a double-walled construction, is made of plastic and is manufactured in the twin-sheet process or extrusion blow molding process.
  • DE 100 01 932 Al underbody paneling is also a blow molding.
  • the present invention has for its object to provide an underbody paneling of the type mentioned, with which the problem of caused by splashing and / or splinter impact noise is largely eliminated and their production costs are nevertheless relatively low.
  • the underbody panel according to the invention consists essentially of a hollow body made of plastic, the underside of which is designed to reduce air resistance and / or substantially smooth surface.
  • the hollow body has on its underside at least one soft wall region and at least one wall region which is relatively hard with respect to the soft wall region, wherein the soft wall region and the relatively hard wall regions are produced by sequential extrusion and / or by sequential coextrusion, and the soft wall region at least on his exposed outside is relatively soft and is arranged in the mounting position of the underbody panel closer to a vehicle than the relatively hard wall area.
  • the or the relatively soft wall portions of the hollow body are arranged where the grit or Spritzwasserbeaufschlagung is optionally greatest.
  • the remaining wall portions of the hollow body are made of relatively hard plastic.
  • the respective soft wall portion of the hollow body reduces the noise caused by splashing water or splinter impact.
  • the soft wall areas are preferably composed of 90 to 70 wt .-% of a polyolefin or copolyolefin and 10 to 30 wt.% Of a crosslinked or partially crosslinked elastomer.
  • the creation of a soft wall area requires only a comparatively small proportion of a soft component on the underbody paneling.
  • EPDM can be used as the soft component.
  • the soft wall areas as well as the relatively hard wall area or areas can in particular be made of polypropylene, with a mixture of polypropylene and EPDM being preferred for the relatively soft wall areas.
  • the or the relatively hard wall portions of the underbody panel according to the invention can be advantageously prepared from fiber-reinforced polyolefin or fiber-reinforced copolyolefin.
  • At least one sound-absorbing structure is preferably formed in the wall region or regions of the underbody cladding made of relatively hard plastic. The effect of the sound-absorbing structure is not adversely affected by the or the soft wall portions of the hollow body.
  • the noise level caused by splash water and / or splinter impact is thus markedly reduced in the underbody paneling according to the invention. It is also possible to produce the underbody panel according to the invention relatively inexpensively, since for the production of its soft area only a relatively small amount of a soft synthetic material is used. Substance component is required and the production of the different soft or hard areas by means of sequential extrusion and / or sequential coextrusion takes place.
  • an advantageous embodiment of the underbody panel according to the invention is that the upper side of the hollow body has an acoustically effective structural portion, in which box-shaped or cup-shaped hollow chambers are formed. This embodiment leads to a significant reduction of the noise level in the passenger compartment (interior) of the motor vehicle and thus to an improvement in ride comfort.
  • Figure 1 is a schematic side view of a motor vehicle with an underbody panel, which is shown for illustration in the not yet assembled state.
  • Figure 2 is a schematic bottom view of a motor vehicle with two mounted on the underbody underbody coatings.
  • Figure 3 is a schematic bottom view of a motor vehicle with three mounted on the underbody underbody panels.
  • a motor vehicle 1 is shown with an underbody 2.
  • the underbody 2 of the motor vehicle extends substantially from the engine compartment 3 to below the trunk.
  • a double-walled, sound-insulating underbody panel 4 is provided, which is not yet attached to the motor vehicle 1 in Fig. 1.
  • the underbody panel 4 is attached to the floor of the motor vehicle by means of screws or other fastening means.
  • the underbody paneling 4 is integrally formed. It is formed from a blow molded part made of plastic, the bottom of which is designed to reduce air resistance and / or substantially smooth surface.
  • the underbody panel 4 serves to reduce the drag coefficient (cW value). It can therefore also be referred to as a cW fairing or as an aerodynamic underbody fairing.
  • the underbody panel 4 is designed so that it covers a larger portion of the underbody 2 of the motor vehicle.
  • two embodiments are shown in which two inventive underbody panels 4 ', 4''spaced from each other on the underbody 2 of a motor vehicle are mounted.
  • the hollow body of the respective underbody panel 4 ', 4' ' has on its underside at least one soft wall area 4.1, 4.3 and at least one relatively hard wall area 4.2 on the other hand.
  • the soft wall portion (s) 4.1, 4.3 are characterized by a hatching which has alternating thin and thick lines, while the relatively hard wall portions 4.2 are characterized by hatching having only thin lines.
  • the relatively hard wall portions 4.2 are characterized by hatching having only thin lines.
  • the two wall regions of the one-piece hollow body are produced by sequential extrusion and / or by sequential coextrusion.
  • the soft wall portion 4.1 or 4.3 is formed relatively soft at least on its exposed outer side and in the mounting position of the underbody panel closer to a vehicle 7.1, 7.2 or 5.1, 5.2 arranged as the relatively hard wall area 4.2.
  • the soft wall region 4.1, 4.3 may be single-layered or multi-layered.
  • the soft wall portions 4.1, 4.3 and the relatively hard wall portions 4.2 of the underbody panel are preferably made of a polyolefin, copolyolefin or multiple polyolefins of the same polyolefin class produced.
  • the soft wall regions 4.1, 4.3 preferably consist of a mixture composed of a polyolefin or copolyolefin and additionally of crosslinked or partially crosslinked elastomers.
  • the soft wall area 4.1 assigned to the front wheel 7.1, 7.2 makes up more than 1/3 of the total length of the underbody cladding 4 '.
  • the soft wall region 4.3 assigned to the rear wheel 5.1, 5.2 is substantially smaller, for example only about half as long as the front soft wall section 4.1.
  • two underbody panels 4 '' are present, in which the front wheel assigned to the soft wall area 4.1 and the adjoining, relatively hard wall area 4.2 are about the same length.
  • the soft wall region 4.1 assigned to the front wheel thus accounts for approximately half the total length of the underbody lining 4 ".
  • an underbody panel according to the invention may also be designed so that it can be mounted on the underbody 2 below the rear region or engine compartment of the motor vehicle.
  • the arranged in Fig. 3 between the rear wheels 5.1, 5.2 underbody panel 4 ''' has two outer, relatively soft wall portions 4.1' and 4.3 ', which are about the same size and between which a relatively hard wall portion 4.2 'is formed.
  • Fig. 4 shows a schematic representation of an inventive underbody panel 4 '' in longitudinal section view.
  • the one-piece underbody paneling 4 '' is designed as a blow-molded part.
  • the underside 8 of the panel 4 '' is formed to reduce the drag coefficient of her equipped with a motor vehicle substantially smooth surface.
  • the hollow body On the upper side, the hollow body has an acoustically effective structure section 9, in which box-shaped or cup-shaped hollow chambers 10 are formed.
  • the hollow chambers 10 are open to the bottom portion 11 on one side. At least a majority of the hollow chambers 10 forms a common, enclosed in the blow molding airspace.
  • the box-shaped or cup-shaped hollow chambers 10 are of different sizes and grouped like islands. A part of the hollow chambers 10 is arranged offset from each other (not shown). Each of the hollow chambers 10 has a substantially planar, oscillatable floor section (ceiling section) 12 and transverse thereto chamber walls 13, which are also formed substantially planar.
  • the different size of the hollow chambers 10 results inter alia in that their base area is different in size; and additionally or alternatively by the fact that their depth or the distance of the oscillatory hollow floor 12 to the bottom portion 11 is dimensioned differently.
  • the hollow body of the underbody paneling 4 "shown in Fig. 4 has a relatively soft section 4.1 and a relatively hard section 4.2 made by sequential extrusion.
  • the soft section 4.1 is in the mounting position of the underbody panel 4 '' closer to the front wheel of the motor vehicle than the relatively hard section 4.2.
  • the aspect ratio of soft portion 4.1 to relatively hard portion 4.2 is approximately in the range of 1: 2 to 1: 1, i. the length of the soft hollow body portion 4.1 corresponds to about one third to about half of the total length of the underbody panel 4 ''.
  • the bottom portion 11 of the underbody panel 4 '' is preferably formed with a greater wall thickness than the upper, the subfloor 2 of the motor vehicle facing hollow body portion with the structural part.
  • the two ends of the hollow body formed from an extruded tube are closed by compression and welded.
  • a plurality of apertures 15 for receiving screws (not shown) or other fastening means are provided.
  • the exemplary embodiment illustrated in FIG. 5 differs from the exemplary embodiment according to FIG. 4 only in that the soft wall region 4.1 and the relatively hard wall region 4.2 have a different wall thickness, at least on the underside 8 of the hollow body formed on the smooth surface. It can be seen that the soft wall region has a greater wall thickness d than the relatively hard wall region 4.2.
  • the relatively hard wall region 4.2 may in particular be made of fiber-reinforced polyolefin or fiber-reinforced copolyolefin.
  • FIGS. 4 and 5 show exemplary embodiments of the underfloor lining 4 "according to the invention, in which the softly formed wall region 4.1 of the hollow body is designed in two layers.
  • the soft wall region 4.1 of the underbody cladding has been produced by sequential coextrusion by extruding on the outside of an extruded tube, which is formed from a relatively hard plastic after solidification, a plastic or elastomer cover layer 4.11 , which remains relatively soft after cooling and solidification.
  • the underfloor lining shown in FIG. 7 has a two-layered soft wall region 4.1 in which both the outer layer 4.11 and the inner layer section 4.12 are made of a polyolefin or .alpha Copolyolefin extruded containing EPDM or other elastomer, so that this wall portion 4.1 remains relatively soft after solidification.
  • the inner layer portion 4.12 and the outer layer 4.11 are preferably made of similar types of plastics, which are, however, different soft or hard after solidification.
  • the outer layer 4.11 of this wall section is preferably softer than the inner layer section 4.12.
  • the outside of the relatively soft wall portion 4.1, 4.3, 4.1 ', 4.3' of the underbody paneling according to the invention is preferably designed in each case with a smooth surface.
  • the underside 8 of the underbody panel according to the invention, including its relatively soft wall portion 4.1, 4.3, 4.1 ', 4.3' is formed substantially free of pores.
  • FIGS. 8 to 10 show exemplary embodiments of the underbody paneling 4 'according to the invention, which each have two relatively soft wall areas 4.1, 4.3, between which a relatively hard wall area 4.2 is formed, viewed in the longitudinal direction of the vehicle.
  • a relatively hard wall area 4.2 is formed in the middle section 4.3 of the underbody paneling 4 'with the relatively hard wall area 4.3.
  • an acoustically effective structure 9 with box-shaped or cup-shaped hollow chambers 10 is formed.
  • the embodiment shown in Fig. 8 differs from the embodiment of FIG. 4, characterized in that in the rear portion of the double-walled underbody panel 4 ', an additional relatively soft wall portion 4.3 is formed, which is associated with the rear wheel (or the rear wheels) of the motor vehicle.
  • the exemplary embodiment according to FIG. 9 has a first, relatively soft wall region 4.1, which is assigned to the front wheel of the motor vehicle and (as in FIG. 6) has a two-layered construction.
  • another soft trained wall portion 4.3 is provided, which is composed of a relatively hard inner layer portion and a contrast soft outer layer 4.31.
  • the underbody paneling 4 'shown in FIG. 10 consists of a hollow body with a front wall area 4.1 and a rear wall area 4.3, which are each constructed from a relatively soft inner layer section 4.12, 4.32 and a soft outer layer 4.11, 4.31.
  • the properties of these two wall regions 4.1, 4.3 preferably correspond to the soft, two-layer wall region 4.1 according to FIG. 7.
  • the embodiment of the invention is not limited to the embodiments described above. Rather, a variety of variants is possible, which make use of the specified in the claims invention even with different design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Body Structure For Vehicles (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Abstract

L'invention concerne une garniture d'isolation acoustique conçue pour le soubassement de véhicules automobiles, comprenant un corps creux qui est produit à partir de plastique et dont la face inférieure est configurée de manière à réduire la résistance de l'air et/ou de façon sensiblement plane. L'objectif de cette invention est de supprimer, dans une large mesure, les bruits provoqués par les projections d'eau ou l'impact de gravillon sur une garniture de soubassement de ce type. A cet effet, ledit corps creux comprend sur sa face inférieure au moins une zone de paroi souple (4.1) et au moins une zone de paroi (4.2) relativement plus dure. Selon l'invention, la zone de paroi souple (4.1) et la zone de paroi relativement plus dure (4.2) sont produites par extrusion séquentielle et/ou coextrusion séquentielle. En outre, la zone de paroi souple (4.1) est configurée de manière relativement souple, au moins au niveau de sa face extérieure dégagée, et est disposée plus près de la roue du véhicule que la zone de paroi relativement plus dure (4.2) une fois la garniture de soubassement (4'') placée dans sa position de montage.
PCT/EP2006/066394 2005-09-26 2006-09-15 Garniture d'isolation acoustique conçue pour le soubassement de vehicules automobiles WO2007036440A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005046087A DE102005046087B3 (de) 2005-09-26 2005-09-26 Schallisolierende Unterbodenverkleidung für Kraftfahrzeuge
DE102005046087.9 2005-09-26

Publications (1)

Publication Number Publication Date
WO2007036440A1 true WO2007036440A1 (fr) 2007-04-05

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DE (1) DE102005046087B3 (fr)
WO (1) WO2007036440A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150329153A1 (en) * 2014-05-15 2015-11-19 Toyota Boshoku Kabushiki Kaisha Vehicular undercover and method of manufacturing the same
FR3061123A1 (fr) * 2016-12-26 2018-06-29 Compagnie Plastic Omnium Piece de vehicule destinee a etre soudee sur un element de carrosserie.

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008024786A1 (de) 2008-05-23 2009-11-26 Dr.Ing.H.C.F.Porsche Aktiengesellschaft Aerodynamisches Verkleidungsteil
FR2932762B1 (fr) * 2008-06-23 2015-05-01 Plastic Omnium Cie Deflecteur de vehicule, notamment deflecteur pour reservoir.
DE102008052970B4 (de) * 2008-10-23 2020-06-18 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Versteifungsboden für ein Kraftfahrzeug
DE102009015548A1 (de) 2009-03-30 2010-10-07 Röchling Automotive AG & Co. KG Verfahren zur Herstellung eines Verkleidungsbauteils mit einer flächigen Verkleidungslage und einer daran vorgesehenen Verstärkungsstruktur
DE102011082060B4 (de) 2011-09-02 2023-08-31 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeug mit einer Unterbodenverkleidung
DE102020118394A1 (de) 2020-07-13 2022-01-13 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeug mit einer Unterseitenverkleidung, Unterseitenverkleidung und Verfahren zur Herstellung einer Unterseitenverkleidung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454949A2 (fr) * 1990-04-11 1991-11-06 Firma Carl Freudenberg Moyen d'amortissement de son transmis par l'air
DE19529440A1 (de) * 1994-08-12 1996-02-29 Illbruck Gmbh Absorber
DE19804567A1 (de) * 1998-02-05 1999-08-12 Wolf Woco & Co Franz J Flächenabsorber
EP1251062A2 (fr) * 2001-04-20 2002-10-23 Illbruck GmbH Habillage de bas de caisse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19715120A1 (de) * 1997-04-11 1998-10-15 Basf Ag Thermoplastische Formkörper mit Segmenten unterschiedlicher Steifigkeit
DE10001932A1 (de) * 2000-01-19 2001-08-02 Kautex Textron Gmbh & Co Kg Verkleidungselement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454949A2 (fr) * 1990-04-11 1991-11-06 Firma Carl Freudenberg Moyen d'amortissement de son transmis par l'air
DE19529440A1 (de) * 1994-08-12 1996-02-29 Illbruck Gmbh Absorber
DE19804567A1 (de) * 1998-02-05 1999-08-12 Wolf Woco & Co Franz J Flächenabsorber
EP1251062A2 (fr) * 2001-04-20 2002-10-23 Illbruck GmbH Habillage de bas de caisse

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150329153A1 (en) * 2014-05-15 2015-11-19 Toyota Boshoku Kabushiki Kaisha Vehicular undercover and method of manufacturing the same
US9487252B2 (en) * 2014-05-15 2016-11-08 Toyota Boshoku Kabushiki Kaisha Vehicular undercover and method of manufacturing the same
FR3061123A1 (fr) * 2016-12-26 2018-06-29 Compagnie Plastic Omnium Piece de vehicule destinee a etre soudee sur un element de carrosserie.
WO2018122481A1 (fr) * 2016-12-26 2018-07-05 Compagnie Plastic Omnium Pièce de véhicule destinée à être soudée sur un élément de carrosserie
US11377159B2 (en) 2016-12-26 2022-07-05 Compagnie Plastic Omnium Vehicle part intended to be welded to a bodywork element

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Publication number Publication date
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