WO1999001314A1 - Assemblage pour element de carrosserie de vehicule et son procede de fabrication - Google Patents

Assemblage pour element de carrosserie de vehicule et son procede de fabrication Download PDF

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Publication number
WO1999001314A1
WO1999001314A1 PCT/SE1998/001310 SE9801310W WO9901314A1 WO 1999001314 A1 WO1999001314 A1 WO 1999001314A1 SE 9801310 W SE9801310 W SE 9801310W WO 9901314 A1 WO9901314 A1 WO 9901314A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
absorbing
sound
designed
load
Prior art date
Application number
PCT/SE1998/001310
Other languages
English (en)
Inventor
Arne Persson
Gunnar Westerlund
Original Assignee
Ab Volvo
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 Ab Volvo filed Critical Ab Volvo
Publication of WO1999001314A1 publication Critical patent/WO1999001314A1/fr

Links

Classifications

    • 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
    • B62D25/08—Front or rear portions
    • B62D25/10—Bonnets or lids, e.g. for trucks, tractors, busses, work vehicles
    • B62D25/105—Bonnets or lids, e.g. for trucks, tractors, busses, work vehicles for motor cars
    • 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
    • B60R13/0838—Insulating elements, e.g. for sound insulation for engine compartments

Definitions

  • TITLE Arrangement for a bodywork component for vehicles and method for manufacturing such an arrangement.
  • the present invention relates to an arrangement for a bodywork component for a vehicle in accordance with the preamble of Patent Claim 1 attached.
  • the invention can be used mainly as a load-absorbing and sound-absorbing arrangement for an engine bonnet of a motor vehicle.
  • the invention also relates to a method for manufacturing such an arrangement in accordance with the preamble of Patent Claim 10 attached.
  • the engine bonnet which is traditionally arranged in such a way that it covers the engine compartment of a motor vehicle.
  • the engine bonnet generally consists of an outer panel which forms the top of the engine bonnet, and an inner load-bearing strut structure which is joined to the underside of the outer panel.
  • the inner strut structure and the outer panel are designed together as an integrated unit in the form of an engine bonnet having the desired stiffness, stability and strength.
  • US Patent Specification 4288490 discloses a previously known bodywork component in the form of an engine bonnet which in turn comprises an outer panel, a load- bearing strut structure and an inner sound-absorbing component in the form of a sheet-like lining.
  • the purpose of the sound-absorbing component is to provide sound insulation and mechanical protection to the inside of the engine bonnet.
  • it is formed as a single piece of synthetic material and is arranged so that it essentially follows the contours of the engine bonnet.
  • the object of the present invention is Co provide an improved arrangement in the context of a bodywork component for a vehicle, e.g. an engine bonnet, which arrangement provides a high load-bearing capacity and at the same time gives good sound-absorbing properties.
  • a further object of the invention is to provide an arrangement which contributes to reducing the weight of the said bodywork component.
  • the abovementioned objects are achieved by means of an arrangement whose characteristic features are set out in Patent Claim 1 attached.
  • the abovementioned objects are also achieved by means of a method whose characterizing features are set out in Patent Claim 10 attached.
  • the invention is intended to constitute a load- absorbing and sound-absorbing arrangement for a bodywork component of a motor vehicle and comprises a first essentially panel-shaped element and at least one sound-absorbing element which is connected to the said first element.
  • the invention is characterized in that the said sound-absorbing element comprises at least one first section which is designed with load-bearing properties .
  • the arrangement according to the invention achieves a number of advantages.
  • the weight of, for example, an engine bonnet can be reduced by at least 40% compared to a known arrangement in which an engine bonnet is provided with an underlying strut structure and a sound-absorbing component.
  • the manufacturing and assembly are simplified compared to those of known arrangements, and this means lower equipment and labour costs and, consequently, reduced manufacturing costs for the vehicle in question.
  • the inside of the engine bonnet is given a more aesthetically attractive appearance compared to a conventional construction, since the underside of the engine bonnet can be made flat and does not need to be adapted to the shape of an inner strut structure, as is the case with conventional engine bonnets.
  • the load-absorbing and sound-absorbing arrangement according to the invention can comprise an element which is manufactured in such a way that it comprises a first section with a relatively stiff and solid load-bearing material structure, and a second section which is made with a relatively porous and sound-absorbing material structure.
  • the element can preferably be manufactured by thermoforming a so-called GMT material (Glass Mat Thermoplastic) consisting of reinforcement fibres which are held together by a thermoplastic binder.
  • GMT material Glass Mat Thermoplastic
  • bodywork component is here understood as meaning a component which constitutes part of a vehicle bodywork and which in particular is intended to provide both load-bearing and sound-absorption, e.g. an engine bonnet, door, hatch, panelling or similar component of the vehicle.
  • Figure 1 is a perspective view, at an angle from above, of an engine bonnet in which the present invention can be used,
  • Figure 2 is a cross-sectional view along the line A-A in Figure 1,
  • Figure 3 is a perspective view, at an angle from underneath, showing the inside of an engine bonnet which is designed in accordance with the arrangement according to the invention
  • Figure 4 is a diagrammatic view of the underside of the engine bonnet, showing the basic structure and function of the invention.
  • Figure 1 shows a perspective view of a bodywork component of a motor vehicle, more specifically in the form of an engine bonnet 1 which is designed in accordance with the present invention.
  • the engine bonnet 1 according to the illustrated embodiment, is intended for a car.
  • the engine bonnet 1 is constructed with an outer panel 2 which is shaped in accordance with the engine compartment of the vehicle in question.
  • the outer panel 2 is preferably made of aluminium, with a thickness which is of the order of 1.0 - 1.5 mm.
  • other materials can also be used, for example sheet steel.
  • the present invention is based on the principle of eliminating such a strut structure.
  • the outer panel 2 is provided with a special load-absorbing and sound-absorbing element '3.
  • This element 3 is essentially shaped as a sheet-like or plate-like component which preferably has essentially the same extent and external dimensions as the outer panel 2 and which is intended to be secured on the underside of the outer panel 2.
  • the element 3 is preferably joined to the underside of the outer panel 2 by means of adhesive bonding, the connection between the two components consisting of suitably placed joins in the form of adhesive strands 4 and 5, respectively, which are indicated by dashed lines in the figure.
  • an outer join 4 is thus formed which runs around the outer edge of the outer panel 2
  • an inner join 5 is formed which runs at a distance to the inside of the said outer join 4.
  • the outer edge of the outer panel 2 is preferably bent to form a groove 6 in which the outer edge of the element 3 is securely clamped.
  • the element 3 is preferably made of composite material and comprises two layers 7, 8.
  • the upper layer 7 i.e. the layer which is directed towards the underside of the outer panel 2 preferably consists of a so-called nonwoven material, also called nonwoven fabric. This material is manufactured according to well-known principles staring from fibres, for example polypropylene, polyester or natural fibres. According to this embodiment, polypropylene fibres are used for manufacturing the upper layer 7. Using a nonwoven material for the upper layer 7 facilitates the attachment to the outer panel 2 upon subsequent adhesive bonding of the element 3.
  • the lower layer 8 preferably consists of a needled fibre mat (also called a needled punch mat) which is a material known per se which is also based on polypropylene fibres. However, this upper layer 8 can also comprise other types of fibres.
  • the two layers 7, 8 are thermoformed so that they form a so-called GMT material (Glass Mat Thermoplastic) .
  • GMT material Glass Mat Thermoplastic
  • this thermoforming which is a process known per se carried out in an oven heated to a temperature of about 220°, the fibres are pressed together to give the desired structure and size, with addition of a thermoplastic binder (matrix agent) .
  • the element 3 is expediently painted and then mounted on the outer panel 2 by means of adhesive bonding, in accordance with what has been stated above.
  • Figure 3 shows a perspective view of the underside of the engine bonnet 1, on which the load-absorbing and sound-absorbing element 3 has been mounted. It can be seen from the figure that the element 3 has external dimensions which essentially correspond to the external dimensions of the outer panel 2. It can also be seen that by joining the element 3 and the outer panel 2 together, the element 3 defines a shape in which a recessed area 9 is formed essentially along the line of the inner join 5, the latter being indicated by a dashed line in Figure 3. Formed between the recessed area 9 and the outer edge 6 of the outer panel 2 there is a first peripheral section 10 of the element 3, which section 10 is shaped essentially as a rectangle extending along the outer edge 6. Moreover, the recessed area 9 surrounds a second central section 11 of the element 3. The second section 11 is also in this case essentially shaped as a rectangle. The border between the first section 10 and the second section 11 is thus defined by the inner join 5.
  • joins 4, 5 (cf. Figure 2) which are fixed to the underside of the outer panel 2 and bear against the latter.
  • the other parts of the element 3 can of course be arranged so that they bear against the outer panel 2, but they are preferably configured in such a way that they are at a certain distance from the outer panel 2.
  • the first section 10 forms a load- bearing section in the form of a rectangular frame which follows the sides of the outer panel 2.
  • the first section 10 is designed with a relatively stiff material character. This can be achieved by ensuring, during thermoforming of the element 3, that its peripheral part (which thus corresponds to the first section 10) is compressed to a relatively great extent so that it is given a solid, stiff and thus load-absorbing character.
  • the first section is preferably designed as a strut-like element with a cross section which is essentially V-shaped.
  • the points of attachment for this strut element consist of the joins 4, 5, so that the strut element forms a triangular shape together with the outer panel 2.
  • thermoforming techniques it is in this way possible to form a stiff strut structure which, after fitting, gives the complete engine bonnet 1 the desired load-bearing capacity.
  • the second section 11 is surrounded by the inner join 5, so that the second section 11 forms a central area which, according to the invention, is designed to provide sound-absorbing properties. This is achieved by means of the fact that during the thermoforming of the element 3, the second section 11 is designed so that it acquires a structure which is considerably more porous, non-compressed and thus more sound-absorbing than the first section 10.
  • an overall structure is formed in which the outer panel 2 is provided with a prefabricated load-absorbing and sound-absorbing element 3, the load absorption being essentially provided by the first, peripheral section 10, and the sound absorption being essentially provided by the second, central section 11.
  • a prefabricated load-absorbing and sound-absorbing element 3 the load absorption being essentially provided by the first, peripheral section 10, and the sound absorption being essentially provided by the second, central section 11.
  • One example of such a parameter is the degree of compression of the respective section 10, 11.
  • a stiff structure is obtained, and by compressing the second section to a lesser extent, a more porous structure is obtained.
  • the amount of added thermoplastic binder can be varied between the different sections 10, 11.
  • a further parameter is the type of fibre which is used in the first and second sections 10, 11, respectively. For example, if carbon fibres are used in the first section 10, a very stiff material structure is obtained.
  • the weight of an engine bonnet for example, can be reduced by at least 40% compared to a conventional engine bonnet if the outer panel 2 of aluminium is used together with the load-absorbing and sound-absorbing element 3.
  • the element 3 can be prefabricated by thermoforming and then joined to the outer panel 2.
  • the complete engine bonnet 1 can be given equally high torsional rigidity and strength as in conventional arrangements having a separate inner strut structure.
  • the arrangement according to the invention is also particularly suitable for recycling, which is an aspect which has become increasingly important in recent years.
  • a thermoplastic adhesive for joining the element 3 to the outer panel 2 the two parts can later be separated by heating, which results in an aluminium panel and a polypropylene-based material section (i.e. the element 3).
  • the latter can be ground down and converted into granules, which can be used once more.
  • the invention is not limited to the illustrative embodiment which has been described above and is shown in the drawings, and instead it can be varied within the scope of the attached patent claims.
  • the invention can in principle be used in connection with different bodywork components of a vehicle, for example doors, hatches and panelling.
  • the invention can be used for different types of vehicles, for example cars, lorries and buses, which can be driven by internal combustion engines, electric motors or other types of drive units.
  • first section 10 and of the second section 11 can be varied.
  • first section 10 it is possible, for example, for the first section 10 to be positioned as a function of the design and material of the outer panel 2 (which determines the requirements in respect of load-bearing) .
  • second section 11 can be positioned, for example, as a function of the position of the engine (which determines the need for sound absorption) .
  • the load-absorbing and sound-absorbing element 3 can consist of a number of different subsidiary elements which are prefabricated separately and then assembled, instead of a single large element (as in the abovementioned embodiment) which covers essentially the whole of the inside of the engine bonnet.
  • the load- absorbing and sound-absorbing element 3 does not need to cover the entire underside of the engine bonnet, but can be placed so that it covers only a certain part of the engine bonnet.
  • the sections 10, 11 do not need to be delimited by any join between the element 3 and the outer panel 2, i.e. the inner join 5 can in principle be omitted.
  • the element 3 can in principle be made of material other than those described above, for example moulded plastic components.
  • the joins 4, 5 can vary in number and position along the outer panel 2.
  • the joins 4, 5 can be arranged in the form of rectangles (as can be seen in Figure 4) or some other suitable shape.
  • the joins 4, 5 do not need to be adhesive joins, but can also be in the form of screw or rivet connections, for example.
  • three joins can be used, for example, so that, for example, two load-bearing sections and one sound-absorbing section are defined.
  • the element 3 can be made up of a different number of layers of fibre material (cf. layers 7, 8 in Figure 2) .
  • the second section 11 can be provided with an extra layer of needle-punched material, which contributes to creating an especially porous and sound-absorbing structure.

Landscapes

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

Abstract

L'invention concerne un assemblage absorption de charge et absorption du son pour un élément de carrosserie (1) d'un véhicule à moteur. Cet assemblage est constitué d'un premier élément sensiblement en forme de panneau (2), et d'au moins un élément d'absorption du son (3), relié audit premier élément (2). Selon cette invention, ledit élément d'absorption du son (3) comprend au moins une première section (10) présentant des caractéristiques portantes. Cette invention concerne également un procédé de fabrication d'un tel assemblage. Cette invention concerne enfin un assemblage amélioré pouvant par exemple être utilisé en tant que capot de moteur d'un véhicule, cet assemblage présentant un poids réduit et pouvant être fabriqué selon un procédé simplifié par rapport à la fabrication de capots de moteur traditionnels.
PCT/SE1998/001310 1997-07-04 1998-07-03 Assemblage pour element de carrosserie de vehicule et son procede de fabrication WO1999001314A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9702584A SE9702584L (sv) 1997-07-04 1997-07-04 Arrangemang vid karosskomponent för fordon samt förfarande för tillverkning av ett sådant arrangemang
SE9702584-5 1997-07-04

Publications (1)

Publication Number Publication Date
WO1999001314A1 true WO1999001314A1 (fr) 1999-01-14

Family

ID=20407638

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/001310 WO1999001314A1 (fr) 1997-07-04 1998-07-03 Assemblage pour element de carrosserie de vehicule et son procede de fabrication

Country Status (2)

Country Link
SE (1) SE9702584L (fr)
WO (1) WO1999001314A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10238207A1 (de) * 2002-08-21 2004-03-25 Bayerische Motoren Werke Ag Fahrzeugkarosserie
EP1512613A3 (fr) * 2003-09-06 2005-12-14 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Couvercle pour un véhicule automobile
WO2006022034A1 (fr) * 2004-08-24 2006-03-02 Yanmar Co., Ltd. Capot et procédé de fabrication associé
FR2911842A1 (fr) * 2007-01-31 2008-08-01 Peugeot Citroen Automobiles Sa Structure de capot avant de vehicule
FR2971222A1 (fr) * 2011-02-07 2012-08-10 Cera Architecture de protection acoustique de la zone de capot d'un vehicule automobile
US11718245B2 (en) 2021-07-29 2023-08-08 Cnh Industrial America Llc Noise mitigation hood

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288490A (en) * 1975-03-27 1981-09-08 Dynamit Nobel Aktiengesellschaft Engine hood lining for automotive vehicles
DE3601204A1 (de) * 1986-01-17 1987-07-23 Daimler Benz Ag Geraeuschdaemmende verkleidung fuer den motorraum von kraftfahrzeugen
EP0511157A1 (fr) * 1991-04-26 1992-10-28 Matec Holding Ag Partie insonorisante d'un véhicule automobile
DE4419218A1 (de) * 1993-07-22 1995-01-26 Opel Adam Ag Großflächiges Karosserieelement eines Kraftfahrzeugs, insbesondere Motor- oder Kofferraumhaube
GB2313096A (en) * 1996-05-16 1997-11-19 Perstorp Components Ltd Vehicle panel acoustic absorption liner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288490A (en) * 1975-03-27 1981-09-08 Dynamit Nobel Aktiengesellschaft Engine hood lining for automotive vehicles
DE3601204A1 (de) * 1986-01-17 1987-07-23 Daimler Benz Ag Geraeuschdaemmende verkleidung fuer den motorraum von kraftfahrzeugen
EP0511157A1 (fr) * 1991-04-26 1992-10-28 Matec Holding Ag Partie insonorisante d'un véhicule automobile
DE4419218A1 (de) * 1993-07-22 1995-01-26 Opel Adam Ag Großflächiges Karosserieelement eines Kraftfahrzeugs, insbesondere Motor- oder Kofferraumhaube
GB2313096A (en) * 1996-05-16 1997-11-19 Perstorp Components Ltd Vehicle panel acoustic absorption liner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 9, No. 282, (M-428); & JP,A,60 124 575 (NISSAN JIDOSHA K.K.) 3 July 1985. *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10238207A1 (de) * 2002-08-21 2004-03-25 Bayerische Motoren Werke Ag Fahrzeugkarosserie
EP1512613A3 (fr) * 2003-09-06 2005-12-14 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Couvercle pour un véhicule automobile
WO2006022034A1 (fr) * 2004-08-24 2006-03-02 Yanmar Co., Ltd. Capot et procédé de fabrication associé
US7686113B2 (en) 2004-08-24 2010-03-30 Yanmar Co., Ltd. Bonnet and method of manufacturing the same
FR2911842A1 (fr) * 2007-01-31 2008-08-01 Peugeot Citroen Automobiles Sa Structure de capot avant de vehicule
EP1953067A1 (fr) * 2007-01-31 2008-08-06 Peugeot Citroën Automobiles S.A. Structure de capot avant de véhicule
FR2971222A1 (fr) * 2011-02-07 2012-08-10 Cera Architecture de protection acoustique de la zone de capot d'un vehicule automobile
US11718245B2 (en) 2021-07-29 2023-08-08 Cnh Industrial America Llc Noise mitigation hood

Also Published As

Publication number Publication date
SE9702584L (sv) 1999-01-11
SE9702584D0 (sv) 1997-07-04

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