EP0973660A1 - PARTIE DE VEHICULE AVEC ABSORBEUR $g(l)/4 - Google Patents

PARTIE DE VEHICULE AVEC ABSORBEUR $g(l)/4

Info

Publication number
EP0973660A1
EP0973660A1 EP98907805A EP98907805A EP0973660A1 EP 0973660 A1 EP0973660 A1 EP 0973660A1 EP 98907805 A EP98907805 A EP 98907805A EP 98907805 A EP98907805 A EP 98907805A EP 0973660 A1 EP0973660 A1 EP 0973660A1
Authority
EP
European Patent Office
Prior art keywords
vehicle
shaped
vehicle part
resonators
part according
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.)
Ceased
Application number
EP98907805A
Other languages
German (de)
English (en)
Inventor
Robert H. Van Ligten
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 International AG
Original Assignee
Rieter Automotive International 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 Automotive International AG filed Critical Rieter Automotive International AG
Publication of EP0973660A1 publication Critical patent/EP0973660A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • 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
    • 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
    • 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
    • B60R13/0884—Insulating elements, e.g. for sound insulation for mounting around noise sources, e.g. air blowers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0001—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular acoustical properties
    • B29K2995/0002—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular acoustical properties insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings

Definitions

  • the present invention relates to a vehicle part according to the preamble of claim 1, and in particular to a hood, a vehicle roof and body spar.
  • Bonnets generally consist of sheet metal parts arranged one above the other in a sandwich-like manner, which have an optically appealing outer skin and an inner sheet metal part. These inner sheet metal parts are used for stiffening and generally have bead-like deformations which, in the assembled state, lead to the formation of a large number of differently shaped cavities. It is known to attach these inner sheet metal parts only partially and at selected locations. In the
  • these sheet metal parts are glued to one another so as not to impair the appearance of the outer sheet metal part.
  • the aim of this design is to create hoods that are as light as possible and sufficiently rigid or other flat vehicle components, such as, for example, trunk lids.
  • This design also allows sufficiently stable areas to be formed in a simple manner for attachment to the vehicle frame, hinges, etc.
  • These double-walled structures have larger surface areas that vibrate slightly. can vibrate and therefore act as unwanted sound sources or strongly reflect sound. These effects make it necessary to apply vibration-damping and sound-absorbing materials, in particular foams or nonwovens, to the inside of these vehicle components. Such sound-absorbing materials are also provided in particular in order to absorb driving noises and engine noises. The subsequent attachment of these absorbent materials to the finished body parts requires additional assembly steps and increases the total weight of these vehicle parts.
  • vehicle roofs usually have a flat component, the edge of which is reinforced with a hollow profile. This stabilizing hollow profile can at the same time be designed as an upper door frame part.
  • vehicle roofs can also be provided with U-shaped cross struts. This part of the vehicle is also vibrated when driving and acts as a source of noise or a sound-reflecting wall.
  • damping layers are glued to the inside of these vehicle roofs and additional, more or less elaborate, sound-absorbing mats made of non-woven fabric or foam are attached.
  • these vehicle roofs are provided with a headlining or other decorative cladding. This one too
  • Construction proves to be more or less complex in production, requires costly manual assembly work and increases the overall weight of the vehicle in an undesirable manner.
  • Modern self-supporting bodies have double-walled structures at various points.
  • the various hollow profiles in the form of struts, supports, columns, beams, spars or frame parts are of particular importance. These hollow profiles are usually made from sheet metal parts and serve to further stiffen and stabilize the entire body.
  • these hollow profiles act as sound tubes, ie they form vibratory air columns, which absorb any vibrations that occur, transmit them, and transfer them to flat components at another point.
  • cross closures, end plugs and / or plugs are inserted into these hollow bodies at various points.
  • vehicle parts or hollow profiles are to be created which have a sound-absorbing effect and without an increase in weight and without a substantial change in the conventional production method, i.e. can be produced inexpensively.
  • a vehicle part having the features of claim 1, and in particular in that the double-walled vehicle parts or hollow profiles forming the cavities are dimensioned, shaped and designed in such a way that they act as ⁇ / 4 absorbers.
  • Such ⁇ / 4 absorbers and their mode of action are known, for example, from WO 96/23294. It is essential that the mouth openings of the individual ⁇ / 4 resonators directly adjoin a sound-reflecting surface. If a sound wave front falls on such a surface, a sound pressure maximum builds up directly in front of this surface. In the mouth area of the ⁇ / 4 resonators, however, the incident sound wave runs into the resonator, is reflected at its end and runs back to the mouth opening. Sound waves, the wavelength of which is 4 times the length of the resonator, appear at the mouth opening with a phase shift of half a wavelength.
  • the ⁇ / 4 resonators can be arranged in any direction and also do not necessarily have to have a straight course.
  • the person skilled in the art can adapt the length and cross section of the ⁇ / 4 resonators to the desired shapes and selected resonance frequencies.
  • the ⁇ / 4 resonators can be tubular or pocket-shaped. If sound absorption over a wide frequency range is required, several groups of differently tuned ⁇ / 4 absorbers can be interleaved.
  • ⁇ / 4 resonators differ significantly from conventional Hel resonators and in particular in that their absorption frequency is determined by the transit time of the incident sound wave, while in Helmholtz resonators the transit time of the incident sound waves is irrelevant.
  • Helmholtz resonators can be described as a spring-mass system and their resonance frequency can be derived from the volume of the Helmholtz body and that of the resonator neck.
  • E according to the invention is therefore provided to create vehicle parts with integrated ⁇ / 4 absorbers.
  • a vehicle part consists in the special construction of a bonnet, which has an outer skin made of sheet steel and is glued to a stiffening inner part also made of sheet steel.
  • this stiffening inner part is deep-drawn in such a way that, in the assembled state, a multiplicity of tubular or pocket-shaped hollow bodies with a predetermined length and in a predetermined distribution are produced.
  • openings can be punched into this molded part in a known manner, in such a way that a large number of ⁇ / 4 resonators are produced in the assembled state.
  • These openings can be designed differently.
  • the mouth regions of the ⁇ / 4 resonators formed in this way can only be partially opened and in particular can be lattice-shaped, slotted or perforated.
  • Such vehicle roofs usually comprise a flat molded part, the edge of which is reinforced with a spar-like hollow profile and can additionally be provided with a plurality of U-shaped support elements. These U-shaped supports form several cavities together with the flat molded part. According to the invention, these cavities are designed such that a large number of ⁇ / 4 resonators are produced. This can improve the sound absorption of the vehicle roof structure without increasing its weight.
  • the body spars themselves are designed as ⁇ / 4 resonators. This is particularly useful because the corner areas in the passenger compartment of vehicles prove to be areas with increased sound pressure values. Therefore, the openings of the ⁇ / 4 resonators formed in the body rails are preferably arranged in these corner regions.
  • FIG. 1 Another embodiment of the component according to the invention is used to form a heat shield with integrated ⁇ / 4 absorbers.
  • Conventional heat shields generally have a heat-insulating layer that lies between two sheet metal parts and / or metallic foils. Modern heat shields also have a sound-absorbing effect.
  • the outer sheet metal parts and / or foils are perforated at least partially and a soft and open-pored insulation layer is used.
  • the insulation layer comprises at least one sheet metal part (in the following, the term sheet metal part also includes foils), which is folded in such a way that a plurality of pocket-shaped cavities with slot-shaped openings are formed.
  • pocket-shaped cavities are dimensioned in such a way that they can act as ⁇ / 4 resonators. It goes without saying that the design of these cavities lies in the area of expert skill. For example, entire cave labyrinth systems can be formed, possibly using several sheet metal parts.
  • this structure is suitable for all double-walled constructions, including tubular support parts, in particular for bonnets, trunk lids, headliners, body struts and spars of all kinds.
  • This structure can also be used with steel sheets, aluminum sheets, fiber-reinforced plastic parts For example, from polyester or other materials used in automotive engineering.
  • Fig. "1 illustrates a basic structure of a sandwich-like member of known type
  • Fig. 2 is a view of a hood according to the invention
  • Figure 3 shows a cross section through an inventive hood.
  • FIG. 5 is a view of a vehicle part suitable for forming a heat shield.
  • the component 1 shown in FIG. 1 consists of an extruded plastic or light metal.
  • the cross section of the individual resonators 6 is approximately rectangular here, the sound-effective orifices 5 are located directly next to the end walls of the resonators 6.
  • Ribs 8 form a hollow part for the ⁇ / 4 resonators 6 with a first molded part 7 and a second molded part 9 Openings 5 can be punched out of the first molded part 7 or the second molded part 9. After the two molded parts 7, 9 have been joined together, opening regions 5 are simply pressed into the hollow bodies 6, so that resonator openings 5 are formed simultaneously and the end walls 4 are formed.
  • FIG. 2 shows an application according to the invention in automobile construction.
  • a second stiffening molded part 12 is attached to a first flat molded part 11, in particular the outer skin of an engine hood.
  • This second molded part 12 consists of a deep-drawn sheet steel and is glued to the first molded part 11.
  • a large number of tubular cavities 13 are formed, which act as ⁇ / 4 resonators.
  • the openings 14 of the ⁇ / 4 resonators 13 are arranged in such a way that penetrating moisture or other contaminants can emerge again unhindered.
  • the distribution and arrangement of the ⁇ / 4 resonators is within the range of the skilled person and can be acoustically optimized through series tests.
  • the cross section shown in FIG. 3 through a vehicle part, in particular a bonnet, makes it clear that the dimensioning and arrangement of the ⁇ / 4 resonators 13 formed by the deep-drawn molded part 12 can be carried out in a suitable manner.
  • the inside can also be covered with a porous decorative layer 16.
  • the design and arrangement of the openings 14 of the individual ⁇ / 4 resonators 13 is in the range of normal technical activity. It goes without saying that the person skilled in the art selects suitable materials and in particular adapts the design of the ⁇ / 4 absorbers to the shape of the vehicle.
  • the vehicle roof shown in FIG. 4 has a first flat molded part 11 and stiffening bars 18, 19 along its edge.
  • the vehicle roof is supported by an A-pillar 21.
  • the spars 18, 19 and the A-pillar 21, which have end pins 22, are provided with openings 14.
  • the design and in particular the length of the ⁇ / 4 resonators formed and the shape of the resonator openings are selected in a suitable manner by the person skilled in the art.
  • the U-shaped support elements 19 are also designed as ⁇ / 4 absorbers and have corresponding plugs 22 and openings 14.
  • the vehicle part shown in FIG. 5 is particularly suitable for use in or as an acoustically absorbing heat shield.
  • a single sheet metal part (film) 31 is folded or. shaped that a plurality of pocket-shaped and overlapping ⁇ / 4 resonators 32 to 37 are formed.
  • the special design of this molded part lies in the area of professional skill.
  • the spaces 38 formed between the cavities can be filled with known heat-insulating materials 39.
  • Such a molded part can easily be made, for example, from a sheet of heat-insulated material laminated with an aluminum foil. shape the material.
  • the sheet metal part 31 can also be perforated at least partially in a known manner, in particular in such a way that the outer sheet metal sections 41 are perforated and the inner sheet metal sections 42, which form the ⁇ / 4 resonators, remain smooth.
  • the construction according to the invention thus allows the creation of stable and lightweight vehicle parts which show a high sound-absorbing effectiveness and in a conventional manner, i.e. are inexpensive to manufacture.

Landscapes

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

Abstract

L'invention concerne des parties de voiture comportant des espaces vides. Ces espaces vides ont une dimension et une forme telles qu'ils agissent comme résonateurs μ/4. Selon une application, les espaces vides compris entre la face extérieure (11) et la partie façonnée intérieure (12) de renforcement de capots sont conçus comme des résonateurs μ/4 (13) en forme de petits tubes ou de poches. Selon une autre application, les montants de la carrosserie sont conçus comme des résonateurs μ/4. Et selon encore une autre utilisation, la couche d'isolation d'écrans thermiques présente une pluralité de résonateurs μ/4 en forme de poches.
EP98907805A 1997-04-11 1998-03-26 PARTIE DE VEHICULE AVEC ABSORBEUR $g(l)/4 Ceased EP0973660A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH84797 1997-04-11
CH84797 1997-04-11
PCT/CH1998/000118 WO1998046456A1 (fr) 1997-04-11 1998-03-26 PARTIE DE VEHICULE AVEC ABSORBEUR μ/4

Publications (1)

Publication Number Publication Date
EP0973660A1 true EP0973660A1 (fr) 2000-01-26

Family

ID=4196602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98907805A Ceased EP0973660A1 (fr) 1997-04-11 1998-03-26 PARTIE DE VEHICULE AVEC ABSORBEUR $g(l)/4

Country Status (3)

Country Link
EP (1) EP0973660A1 (fr)
JP (1) JP2001507308A (fr)
WO (1) WO1998046456A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999061221A1 (fr) * 1998-05-22 1999-12-02 Rieter Automotive (International) Ag Procede de fabrication d'un composant a double paroi a absorbeurs lambda/4 integre
US6821597B1 (en) 1999-03-10 2004-11-23 Magee Rieter Automotive Systems Method for manufacturing a sound insulating structure and the structure produced thereby
EP1220765B1 (fr) * 1999-10-14 2003-12-17 Magna Interior Systems, Inc. Procede de fabrication d'une garniture de toit a mousse integree absorbant l'energie
FR2806999B1 (fr) 2000-03-28 2002-09-06 Solvay Couvercle de compartiment moteur d'un vehicule
FR2858589B1 (fr) * 2003-08-04 2006-12-01 Cera Panneau de renfort multifonction d'un capot de vehicule automobile
DE102005019204B4 (de) * 2005-04-28 2007-08-02 Daimlerchrysler Ag Vorrichtung zur Schallabsorption und -reduktion im Fahrzeuginnenraum
DE102006027230A1 (de) 2006-06-09 2007-12-20 EFA -Entwicklungsgesellschaft für Akustik mbH Akustisch und thermisch wirkende Isolation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124798A (en) * 1954-06-11 1964-03-10 Reflection-free damping structure for
US4339018A (en) * 1978-10-27 1982-07-13 Lord Corporation Sound absorbing structure
DE4404502C2 (de) * 1994-02-12 2002-02-28 Bosch Gmbh Robert Schalldämmende Abdeckhaube
CH690143A5 (de) 1995-01-27 2000-05-15 Rieter Automotive Int Ag Lambda/4-Schallabsorber.
EP0738865B1 (fr) * 1995-04-20 2000-08-23 Contraves Space AG Protection acoustique sur structures environnant la charge utile de lanceurs non-réutilisables

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9846456A1 *

Also Published As

Publication number Publication date
WO1998046456A1 (fr) 1998-10-22
JP2001507308A (ja) 2001-06-05

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