WO2017212178A1 - Acoustic protection device for a motor vehicle engine - Google Patents

Acoustic protection device for a motor vehicle engine Download PDF

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Publication number
WO2017212178A1
WO2017212178A1 PCT/FR2017/051451 FR2017051451W WO2017212178A1 WO 2017212178 A1 WO2017212178 A1 WO 2017212178A1 FR 2017051451 W FR2017051451 W FR 2017051451W WO 2017212178 A1 WO2017212178 A1 WO 2017212178A1
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WO
WIPO (PCT)
Prior art keywords
shell
walls
porous
porous material
wall
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PCT/FR2017/051451
Other languages
French (fr)
Inventor
Stéphane Ribes
François Choquart
Guillaume Crignon
Original Assignee
Cera Aps
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Publication date
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Publication of WO2017212178A1 publication Critical patent/WO2017212178A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/24—Devices purely for ventilating or where the heating or cooling is irrelevant
    • B60H1/26—Ventilating openings in vehicle exterior; Ducts for conveying ventilating air
    • B60H1/28—Ventilating openings in vehicle exterior; Ducts for conveying ventilating air the openings being situated directly in front of vehicle front window
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H2001/006—Noise reduction

Definitions

  • the invention relates to an acoustic protection device for a motor vehicle engine and a method for producing such a device.
  • one adds on the one hand the sound insulation and rigidity performances provided by the molded plastic shell, which is tight and rigid, and on the other hand absorption performance, provided by the layer of porous material.
  • a device thus designed has a significant weight, because of the addition of the layer of porous material, and also a certain fragility, the cohesion between said layer and the shell may be weakened over time and said layer it can also be destructured, for example by the action of fluids such as water or oil that can be thrown on it.
  • the invention aims to overcome these disadvantages while maintaining the acoustic protection properties of the device.
  • the invention proposes an acoustic protection device for a motor vehicle engine, said device comprising a first sealed and non-porous shell of molded thermoplastic material, said device further comprising a second shell of porous acoustically-formed acoustic absorption material, said porous material being based on fibers interconnected by a binder, said shells being interconnected edge-to-edge in a connection zone, said device further having the following characteristics:
  • Said second shell comprises two outer and inner walls of said porous material, said walls being shaped hot,
  • Said outer wall has a resistance to the passage of air, measured according to ISO 9053, method B with recirculating air flow, greater than 5000 Nms -3 ,
  • Said walls are generally spaced from one another by an air gap
  • Said walls are associated with each other substantially by their periphery.
  • Such an arrangement allows for a lightening of the device, because of the substitution of a portion of the first shell by the second which has a low weight because of its porous nature.
  • the second shell can be associated very firmly with the first, in particular by overmolding, as will be seen later.
  • the second shell being shaped hot, the binder ensuring a high degree of cohesion between the fibers, which limits the risk of degradation, especially in the face of the projection of fluids, over time.
  • the first shell plays both a structural role, due to the intrinsic rigidity of the thermoplastic material, and also a role of acoustic insulation, due to its tightness.
  • the Applicant has also observed that the fact of providing a second shell having two walls separated by an air gap substantially improves the acoustic protection performance of said shell.
  • the external wall because of its essentially watertight nature, linked to its resistance to the passage of air greater than 5,000 Nms- 3 , has an essential function of insulation
  • the inner wall, combined with the air gap, has an essential function of acoustic absorption, by superposition phenomenon of a porous membrane on a layer of air, and to a lesser extent an acoustic insulation function.
  • the invention proposes a method of producing such a device.
  • a device 1 for acoustic protection for a motor vehicle engine comprising a first sealed and non-porous shell 2 made of molded thermoplastic material - in particular by injection - said device further comprising a second shell 3 in porous material of acoustic absorption shaped hot, said porous material being based on fibers interconnected by a binder, said shells being bonded between they border against edge in a connection zone 4, said device further having the following characteristics:
  • Said second shell comprises two outer and inner walls 5 of said porous material, said walls being shaped hot,
  • ⁇ Said outer wall has a resistance to the passage of air, measured according to ISO 9053, Method B with alternative air flow, greater than 5,000 Nms -3 ,
  • Said walls are generally spaced from one another by an air gap 7,
  • Said walls are associated with each other substantially by their periphery, in particular by welding.
  • such a device 1 is intended to overlap a timing belt.
  • one of the walls 6 - here the inner wall - comprises at least one non-peripheral boss 8 forming means for spacing said walls from one another to ensure the presence of the air gap 7.
  • one of the walls - here the outer wall 5 - protrudes at the periphery of the edge of the other wall - here the inner wall 6 -, so that the second shell 3 has a single-wall peripheral band 9.
  • the air knife 7 generally has a thickness of between 5 and 10 mm.
  • the porous material comprises between 20 and 60% by weight of glass fibers bonded together by a polypropylene binder.
  • the walls 5, 6 of the second shell 3 have a minimum mass per unit area of 400 g / m 2 , and in particular between 500 and 1000 g / m 2 .
  • the outer wall 5 comprises, on the side of its outer face, a sealing film 19 covering the porous material, said film permitting perfect sealing of said wall and also a protection of said porous material against fluids such as water or oil.
  • the outer wall 5 provided with the film 19 has an essential function of insulation
  • the internal wall 6, combined with the air knife 7, has an essential function of acoustic absorption, by superposition phenomenon of a porous membrane on an air layer, and to a lesser extent an insulation function acoustic.
  • the outer wall 5 should be sufficiently compressed so that its behavior is satisfactory in isolation, that is to say without resonance in the thickness in the desired frequency domain.
  • the inner wall 6, to best perform its role of absorption can typically have a resistance to the passage of air, measured according to ISO 9053, method B with air flow, between 500 and 3000 Nsnrr 3 .
  • the outer face of the outer wall 5 may be formed by a protective nonwoven having in particular a mass per unit area of between 50 and 100 g / m 2 .
  • the second shell 3 is overmolded by the first 2.
  • the peripheral strip 9 has, in connection zone 4, an overcompression of the outer wall 5 forming a recess 14, said recess defining a flat part. 22.
  • the first shell 2 extends into the recess 14.
  • the first shell 2 overmoulds the second shell 3 both by its edge 16 and by the flat portion 22 defined by the recess 14, which allows a particularly robust association between said first and second shells.
  • thermoplastic material Injecting a thermoplastic material into said cavity in such a way as to produce a first shell 2 molding on the edge against the edge of said second shell,
  • Demolding the device 1 obtained. If provision is made for placing a film 19 in the outer wall 5, said film is associated with the porous material, especially during thermocompression forming.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention relates to a device (1) comprising a first sealed, non-porous shell (2) made of a molded thermoplastic material, and a second shell (3) made of a hot-formed porous acoustic absorption material, said porous material being based on fibers that are connected to one another by a binder, said shells being joined to one another border-to-border in a joining region (4), said device further having the following features: said second shell comprises two walls, an outer wall (5) and an inner wall (6), of said porous material, said walls being hot-formed; said outer wall has a resistance to the passage of air, measured according to ISO 9053, method B with alternative airflow, of greater than 000 N.m.s-3; said walls are generally spaced apart from one another by an air gap (7), said walls are linked to one another essentially by their periphery.

Description

Dispositif de protection acoustique pour moteur de véhicule automobile  Sound protection device for motor vehicle engine
L'invention concerne un dispositif de protection acoustique pour moteur de véhicule automobile et un procédé de réalisation d'un tel dispositif. The invention relates to an acoustic protection device for a motor vehicle engine and a method for producing such a device.
Il est connu de réaliser un tel dispositif comprenant une coque étanche et non poreuse en matériau thermoplastique moulé, notamment par injection, occupant sensiblement toute la surface dudit dispositif. It is known to provide such a device comprising a sealed and non-porous shell molded thermoplastic material, in particular by injection, occupying substantially the entire surface of said device.
Avec un tel agencement, on réalise une isolation acoustique qui peut s'avérer insuffisante pour atténuer correctement les nuisances sonores. With such an arrangement, an acoustic insulation is produced that may be insufficient to properly mitigate noise.
Pour améliorer cet état de fait, il a été proposé de revêtir l'envers de la coque, sur au moins une partie de sa surface, d'une couche de matériau poreux d'absorption acoustique, ledit matériau poreux étant notamment à base de feutre. To improve this state of affairs, it has been proposed to coat the underside of the shell, on at least a portion of its surface, with a layer of porous acoustic absorption material, said porous material being in particular based on felt .
Dans une telle réalisation, on additionne d'une part les performances d'isolation acoustique et de rigidité apportées par la coque en matériau plastique moulé, qui est étanche et rigide, et d'autre part des performances d'absorption, apportées par la couche de matériau poreux. In such an embodiment, one adds on the one hand the sound insulation and rigidity performances provided by the molded plastic shell, which is tight and rigid, and on the other hand absorption performance, provided by the layer of porous material.
Cependant, un dispositif ainsi conçu présente un poids important, du fait de l'ajout de la couche de matériau poreux, et aussi une certaine fragilité, la cohésion entre ladite couche et la coque pouvant s'avérer fragilisée au cours du temps et ladite couche étant en outre susceptible de se déstructurer, par exemple sous l'action de fluides comme l'eau ou l'huile susceptibles d'être projetés dessus. However, a device thus designed has a significant weight, because of the addition of the layer of porous material, and also a certain fragility, the cohesion between said layer and the shell may be weakened over time and said layer it can also be destructured, for example by the action of fluids such as water or oil that can be thrown on it.
L'invention a pour but de pallier ces inconvénients tout en conservant les propriétés de protection acoustique du dispositif. The invention aims to overcome these disadvantages while maintaining the acoustic protection properties of the device.
A cet effet, et selon un premier aspect, l'invention propose un dispositif de protection acoustique pour moteur de véhicule automobile, ledit dispositif comprenant une première coque étanche et non poreuse en matériau thermoplastique moulé, ledit dispositif comprenant en outre une deuxième coque en matériau poreux d'absorption acoustique conformé à chaud, ledit matériau poreux étant à base de fibres reliées entre elles par un liant, lesdites coques étant liées entre elles bordure contre bordure dans une zone de liaison, ledit dispositif présentant en outre les caractéristiques suivantes : For this purpose, and according to a first aspect, the invention proposes an acoustic protection device for a motor vehicle engine, said device comprising a first sealed and non-porous shell of molded thermoplastic material, said device further comprising a second shell of porous acoustically-formed acoustic absorption material, said porous material being based on fibers interconnected by a binder, said shells being interconnected edge-to-edge in a connection zone, said device further having the following characteristics:
• ladite deuxième coque comprend deux parois externe et interne dudit matériau poreux, lesdites parois étant conformées à chaud,  Said second shell comprises two outer and inner walls of said porous material, said walls being shaped hot,
• ladite paroi externe présente une résistance au passage de l'air, mesurée selon la norme ISO 9053, méthode B avec écoulement d'air alternatif, supérieure à 5 000 N.m.s-3, Said outer wall has a resistance to the passage of air, measured according to ISO 9053, method B with recirculating air flow, greater than 5000 Nms -3 ,
• lesdites parois sont généralement espacées l'une de l'autre par une lame d'air,  Said walls are generally spaced from one another by an air gap,
• lesdites parois sont associées l'une à l'autre sensiblement par leur périphérie.  Said walls are associated with each other substantially by their periphery.
Un tel agencement permet de réaliser un allégement du dispositif, du fait de la substitution d'une partie de la première coque par la deuxième qui présente un faible poids du fait de son caractère poreux. Such an arrangement allows for a lightening of the device, because of the substitution of a portion of the first shell by the second which has a low weight because of its porous nature.
En outre, la deuxième coque peut être associée très solidement à la première, notamment par surmoulage, comme on le verra plus loin. In addition, the second shell can be associated very firmly with the first, in particular by overmolding, as will be seen later.
Enfin, la deuxième coque étant conformée à chaud, le liant assurant une grande cohésion entre les fibres, ce qui limite les risques de dégradation, notamment face à la projection de fluides, au cours du temps. Finally, the second shell being shaped hot, the binder ensuring a high degree of cohesion between the fibers, which limits the risk of degradation, especially in the face of the projection of fluids, over time.
La première coque joue à la fois un rôle structurel, de par la rigidité intrinsèque du matériau thermoplastique, et aussi un rôle d'isolation acoustique, de par son étanchéité. La demanderesse a par ailleurs observé que le fait de prévoir une deuxième coque présentant deux parois séparées par une lame d'air permet d'améliorer sensiblement les performances de protection acoustique de ladite coque. On dispose alors d'une deuxième coque dans laquelle : The first shell plays both a structural role, due to the intrinsic rigidity of the thermoplastic material, and also a role of acoustic insulation, due to its tightness. The Applicant has also observed that the fact of providing a second shell having two walls separated by an air gap substantially improves the acoustic protection performance of said shell. We then have a second shell in which:
• la paroi externe, de par son caractère sensiblement étanche lié à sa résistance au passage de l'air supérieure à 5 000 N.m.s-3, a une fonction essentielle d'isolation, The external wall, because of its essentially watertight nature, linked to its resistance to the passage of air greater than 5,000 Nms- 3 , has an essential function of insulation,
• la paroi interne, combinée à la lame d'air, a une fonction essentielle d'absorption acoustique, par phénomène de superposition d'une membrane poreuse sur une couche d'air, et dans une moindre mesure une fonction d'isolation acoustique.  • the inner wall, combined with the air gap, has an essential function of acoustic absorption, by superposition phenomenon of a porous membrane on a layer of air, and to a lesser extent an acoustic insulation function.
Enfin, le fait que la deuxième coque soit ainsi structurée permet de lui conférer une bonne rigidité, ceci par « effet de poutre » obtenu par mise en regard de deux parois écartées l'une de l'autre, éventuellement par le biais d'un moyen d'écartement, ceci permettant de s'affranchir de l'ajout éventuel d'un moyen de rigidification additionnel. Selon un deuxième aspect, l'invention propose un procédé de réalisation d'un tel dispositif. Finally, the fact that the second shell is thus structured makes it possible to give it good rigidity, this by "beam effect" obtained by facing two walls spaced apart from one another, possibly through a spacing means, this to overcome the possible addition of additional stiffening means. According to a second aspect, the invention proposes a method of producing such a device.
D'autres particularités et avantages de l'invention apparaîtront dans la description qui suit, faite en référence à la figure jointe, qui est une vue schématique en coupe partielle d'un dispositif selon une réalisation. Other features and advantages of the invention will appear in the description which follows, made with reference to the attached figure, which is a schematic partial sectional view of a device according to one embodiment.
En référence à la figure, on décrit un dispositif 1 de protection acoustique pour moteur de véhicule automobile, ledit dispositif comprenant une première coque étanche et non poreuse 2 en matériau thermoplastique moulé - notamment par injection - ledit dispositif comprenant en outre une deuxième coque 3 en matériau poreux d'absorption acoustique conformé à chaud, ledit matériau poreux étant à base de fibres reliées entre elles par un liant, lesdites coques étant liées entre elles bordure contre bordure dans une zone de liaison 4, ledit dispositif présentant en outre les caractéristiques suivantes : Referring to the figure, there is described a device 1 for acoustic protection for a motor vehicle engine, said device comprising a first sealed and non-porous shell 2 made of molded thermoplastic material - in particular by injection - said device further comprising a second shell 3 in porous material of acoustic absorption shaped hot, said porous material being based on fibers interconnected by a binder, said shells being bonded between they border against edge in a connection zone 4, said device further having the following characteristics:
• ladite deuxième coque comprend deux parois externe 5 et interne 6 dudit matériau poreux, lesdites parois étant conformées à chaud,  Said second shell comprises two outer and inner walls 5 of said porous material, said walls being shaped hot,
· ladite paroi externe présente une résistance au passage de l'air, mesurée selon la norme ISO 9053, méthode B avec écoulement d'air alternatif, supérieure à 5 000 N.m.s-3, · Said outer wall has a resistance to the passage of air, measured according to ISO 9053, Method B with alternative air flow, greater than 5,000 Nms -3 ,
• lesdites parois sont généralement espacées l'une de l'autre par une lame d'air 7,  Said walls are generally spaced from one another by an air gap 7,
· lesdites parois sont associées l'une à l'autre sensiblement par leur périphérie, notamment par soudure.  Said walls are associated with each other substantially by their periphery, in particular by welding.
En particulier, un tel dispositif 1 est destiné à venir en recouvrement d'une courroie de distribution. In particular, such a device 1 is intended to overlap a timing belt.
Selon la réalisation représentée, une des parois 6 - ici la paroi interne - comprend au moins un bossage 8 non périphérique formant moyen d'écartement desdites parois l'une de l'autre pour garantir la présence de la lame d'air 7. Selon la réalisation représentée, une des parois - ici la paroi externe 5 - dépasse en périphérie du bord de l'autre paroi - ici la paroi interne 6 -, de sorte que la deuxième coque 3 présente une bande périphérique 9 mono-paroi. According to the embodiment shown, one of the walls 6 - here the inner wall - comprises at least one non-peripheral boss 8 forming means for spacing said walls from one another to ensure the presence of the air gap 7. According to the embodiment shown the embodiment shown, one of the walls - here the outer wall 5 - protrudes at the periphery of the edge of the other wall - here the inner wall 6 -, so that the second shell 3 has a single-wall peripheral band 9.
Un tel agencement permet de notamment répondre à une problématique d'encombrement au niveau de la jonction entre les coques 2,3. Such an arrangement makes it possible in particular to respond to a problem of space at the junction between the shells 2,3.
Selon une réalisation, la lame d'air 7 présente généralement une épaisseur comprise entre 5 et 10 mm. Selon une réalisation, le matériau poreux comprend entre 20 et 60% en poids de fibres de verre liées entre elles par un liant en polypropylène. Selon une réalisation, les parois 5,6 de la deuxième coque 3 présentent une masse surfacique minimale de 400 g/m2, et notamment comprise entre 500 et 1000 g/m2. Selon la réalisation représentée, la paroi externe 5 comprend, du côté de sa face externe, un film d'étanchéité 19 recouvrant le matériau poreux, ledit film permettant une étanchéité parfaite de ladite paroi et également une protection dudit matériau poreux contre les fluides tels que l'eau ou l'huile. On dispose alors d'une deuxième coque 3 dans laquelle : In one embodiment, the air knife 7 generally has a thickness of between 5 and 10 mm. In one embodiment, the porous material comprises between 20 and 60% by weight of glass fibers bonded together by a polypropylene binder. According to one embodiment, the walls 5, 6 of the second shell 3 have a minimum mass per unit area of 400 g / m 2 , and in particular between 500 and 1000 g / m 2 . According to the embodiment shown, the outer wall 5 comprises, on the side of its outer face, a sealing film 19 covering the porous material, said film permitting perfect sealing of said wall and also a protection of said porous material against fluids such as water or oil. We then have a second shell 3 in which:
• la paroi externe 5 pourvue du film 19 a une fonction essentielle d'isolation, The outer wall 5 provided with the film 19 has an essential function of insulation,
• la paroi interne 6, combinée à la lame d'air 7, a une fonction essentielle d'absorption acoustique, par phénomène de superposition d'une membrane poreuse sur une couche d'air, et dans une moindre mesure une fonction d'isolation acoustique. The internal wall 6, combined with the air knife 7, has an essential function of acoustic absorption, by superposition phenomenon of a porous membrane on an air layer, and to a lesser extent an insulation function acoustic.
Il convient notamment que la paroi externe 5 soit suffisamment comprimée pour que son comportement soit satisfaisant en isolation, c'est-à-dire sans résonance dans l'épaisseur dans le domaine fréquentiel visé. In particular, the outer wall 5 should be sufficiently compressed so that its behavior is satisfactory in isolation, that is to say without resonance in the thickness in the desired frequency domain.
En variante non représentée, on pourrait envisager de réaliser une compression très importante du matériau poreux de la paroi externe 5, de manière à lui conférer la résistance au passage de l'air minimale attendue, ce qui pourrait permettre de s'affranchir de l'utilisation d'un film d'étanchéité. In a variant not shown, it could be envisaged to achieve a very large compression of the porous material of the outer wall 5, so as to give it the resistance to the passage of the minimum expected air, which could make it possible to get rid of the use of a sealing film.
Dans toutes les réalisations, la paroi interne 6, pour jouer au mieux son rôle d'absorption, peut présenter typiquement une résistance au passage de l'air, mesurée selon la norme ISO 9053, méthode B avec écoulement d'air alternatif, comprise entre 500 et 3 000 N.s.nrr3. In all the embodiments, the inner wall 6, to best perform its role of absorption, can typically have a resistance to the passage of air, measured according to ISO 9053, method B with air flow, between 500 and 3000 Nsnrr 3 .
Selon une réalisation non représentée, la face externe de la paroi externe 5 peut être formée par un non tissé de protection, présentant notamment une masse surfacique comprise entre 50 et 100 g/m2. Selon la réalisation représentée, la deuxième coque 3 est surmoulée par la première 2. Selon la réalisation représentée, la bande périphérique 9 présente, en zone de liaison 4, une surcompression de la paroi externe 5 réalisant un renfoncement 14, ledit renfoncement définissant un méplat 22. According to an embodiment not shown, the outer face of the outer wall 5 may be formed by a protective nonwoven having in particular a mass per unit area of between 50 and 100 g / m 2 . According to the embodiment shown, the second shell 3 is overmolded by the first 2. According to the embodiment shown, the peripheral strip 9 has, in connection zone 4, an overcompression of the outer wall 5 forming a recess 14, said recess defining a flat part. 22.
Selon la réalisation représentée, la première coque 2 s'étend dans le renfoncement 14. According to the embodiment shown, the first shell 2 extends into the recess 14.
Avec un tel agencement, la première coque 2 surmoule la deuxième coque 3 à la fois par sa tranche 16 et par le méplat 22 défini par le renfoncement 14, ce qui permet une association particulièrement robuste entre lesdites première et deuxième coques. With such an arrangement, the first shell 2 overmoulds the second shell 3 both by its edge 16 and by the flat portion 22 defined by the recess 14, which allows a particularly robust association between said first and second shells.
On décrit enfin un procédé de réalisation d'un tel dispositif 1 , ledit procédé comprenant les étapes suivantes : Finally, a method of producing such a device 1 is described, said method comprising the following steps:
• prévoir deux flans de matériau poreux pourvu de fibres et d'un liant activable à chaud,  • provide two blanks of porous material provided with fibers and a hot-activatable binder,
• réaliser un formage desdits flans par thermocompression de manière à obtenir deux parois 5,6,  • forming a forming said blanks by thermocompression so as to obtain two walls 5,6,
• associer lesdites parois entre elles par leur périphérie et effectuer une découpe périphérique éventuelle pour réaliser une deuxième coque 3, · disposer ladite deuxième coque dans un moule d'injection pourvu d'une cavité de moulage à la géométrie du dispositif 1 à obtenir,  Associating said walls with each other by their periphery and making a possible peripheral cut to produce a second shell 3, arranging said second shell in an injection mold provided with a mold cavity to the geometry of the device 1 to be obtained,
• injecter un matériau thermoplastique dans ladite cavité de manière à réaliser une première coque 2 surmoulant bordure contre bordure ladite deuxième coque,  Injecting a thermoplastic material into said cavity in such a way as to produce a first shell 2 molding on the edge against the edge of said second shell,
· démouler le dispositif 1 obtenu. Si l'on prévoit la mise en place d'un film 19 dans la paroi externe 5, ledit film est associé au matériau poreux notamment lors du formage par thermocompression. Demolding the device 1 obtained. If provision is made for placing a film 19 in the outer wall 5, said film is associated with the porous material, especially during thermocompression forming.

Claims

REVENDICATIONS
1 . Dispositif (1 ) de protection acoustique pour moteur de véhicule automobile, ledit dispositif comprenant une première coque (2) étanche et non poreuse en matériau thermoplastique moulé, ledit dispositif étant caractérisé en ce qu'il comprend en outre une deuxième coque (3) en matériau poreux d'absorption acoustique conformé à chaud, ledit matériau poreux étant à base de fibres reliées entre elles par un liant, lesdites coques étant liées entre elles bordure contre bordure dans une zone de liaison (4), ledit dispositif présentant en outre les caractéristiques suivantes : 1. Acoustic protection device (1) for a motor vehicle engine, said device comprising a first waterproof and non-porous shell (2) made of molded thermoplastic material, said device being characterized in that it further comprises a second shell (3) made of hot-formed porous sound absorption material, said porous material being based on fibers linked together by a binder, said shells being linked together edge to edge in a connection zone (4), said device further having the characteristics following:
• ladite deuxième coque comprend deux parois externe (5) et interne (6) dudit matériau poreux, lesdites parois étant conformées à chaud, • said second shell comprises two external (5) and internal (6) walls of said porous material, said walls being shaped hot,
• ladite paroi externe présente une résistance au passage de l'air, mesurée selon la norme ISO 9053, méthode B avec écoulement d'air alternatif, supérieure à 5 000 N. m. s-3, • said external wall has a resistance to the passage of air, measured according to standard ISO 9053, method B with alternating air flow, greater than 5,000 N. m. s -3 ,
• lesdites parois sont généralement espacées l'une de l'autre par une lame d'air (7), • said walls are generally spaced from one another by an air gap (7),
• lesdites parois sont associées l'une à l'autre sensiblement par leur périphérie. • said walls are associated with one another substantially by their periphery.
2. Dispositif selon la revendication 1 , caractérisé en ce qu'une des parois (6) comprend au moins un bossage (8) non périphérique formant moyen d'écartement desdites parois l'une de l'autre pour garantir la présence de la lame d'air (7). 2. Device according to claim 1, characterized in that one of the walls (6) comprises at least one non-peripheral boss (8) forming a means of spacing said walls from one another to guarantee the presence of the blade air (7).
3. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce qu'une des parois (5) dépasse en périphérie du bord de l'autre paroi (6), de sorte que la deuxième coque (3) présente une bande périphérique (9) mono-paroi. 3. Device according to one of claims 1 or 2, characterized in that one of the walls (5) protrudes at the periphery of the edge of the other wall (6), so that the second shell (3) has a strip peripheral (9) single-walled.
4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la lame d'air (7) présente généralement une épaisseur comprise entre 5 et 4. Device according to any one of claims 1 to 3, characterized in that the air blade (7) generally has a thickness of between 5 and
5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le matériau poreux comprend entre 20 et 60% en poids de fibres de verre liées entre elles par un liant en polypropylène. 6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les parois (5,5. Device according to any one of claims 1 to 4, characterized in that the porous material comprises between 20 and 60% by weight of glass fibers linked together by a polypropylene binder. 6. Device according to any one of claims 1 to 5, characterized in that the walls (5,
6) de la deuxième coque (3) présentent une masse surfacique minimale de 400 g/m2, et notamment comprise entre 500 et 1000 g/m2. 6) of the second shell (3) have a minimum surface mass of 400 g/m 2 , and in particular between 500 and 1000 g/m 2 .
7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la paroi externe (5) comprend, du côté externe, un film d'étanchéité (19) recouvrant le matériau poreux. 7. Device according to any one of claims 1 to 6, characterized in that the external wall (5) comprises, on the external side, a sealing film (19) covering the porous material.
8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la deuxième coque (3) est surmoulée par la première (2). 8. Device according to any one of claims 1 to 7, characterized in that the second shell (3) is overmolded by the first (2).
9. Procédé de réalisation d'un dispositif selon la revendication 8, caractérisé en ce qu'il comprend les étapes suivantes : 9. Method for producing a device according to claim 8, characterized in that it comprises the following steps:
• prévoir deux flans de matériau poreux pourvu de fibres et d'un liant activable à chaud, • provide two blanks of porous material provided with fibers and a hot-activated binder,
· réaliser un formage desdits flans par thermocompression de manière à obtenir deux parois (5,6), · form said blanks by thermocompression so as to obtain two walls (5,6),
• associer lesdites parois entre elles par leur périphérie et effectuer une découpe périphérique éventuelle pour réaliser une deuxième coque (3), • associate said walls together by their periphery and make a possible peripheral cut to make a second shell (3),
• disposer ladite deuxième coque dans un moule d'injection pourvu d'une cavité de moulage à la géométrie du dispositif (1 ) à obtenir, • place said second shell in an injection mold provided with a molding cavity with the geometry of the device (1) to be obtained,
• injecter un matériau thermoplastique dans ladite cavité de manière à réaliser une première coque (2) surmoulant bordure contre bordure ladite deuxième coque, • inject a thermoplastic material into said cavity so as to produce a first shell (2) overmolding edge to edge of said second shell,
• démouler le dispositif (1 ) obtenu. • unmold the device (1) obtained.
PCT/FR2017/051451 2016-06-10 2017-06-08 Acoustic protection device for a motor vehicle engine WO2017212178A1 (en)

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FR1655367 2016-06-10
FR1655367A FR3052396B1 (en) 2016-06-10 2016-06-10 DEVICE FOR COLLECTING AND SEPARATING WATER AND VENTILATION AIR FROM A MOTOR VEHICLE HABITACLE

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10261081B3 (en) * 2002-12-20 2004-02-19 Carcoustics Tech Center Gmbh Air intake channel, for a vehicle IC motor, has a plastics channel body with sound-absorbent wall inserts, with their edges encapsulated in the injection molding of the body in a positive fit
WO2005030532A1 (en) * 2003-09-23 2005-04-07 Aksys Gmbh Method and device for soundproofing and design therefor, especially for motor vehicles
DE20320100U1 (en) * 2003-12-23 2005-05-12 Carcoustics Tech Center Gmbh Airborne sound absorbing component
WO2012119654A1 (en) * 2011-03-09 2012-09-13 Autoneum Management Ag Automotive noise attenuating trim part
JP2014085421A (en) * 2012-10-22 2014-05-12 Inoac Corp Sound absorbing structure
FR3027817A1 (en) * 2014-10-29 2016-05-06 Centre D'etude Et De Rech Pour L'automobile (Cera) DEVICE FOR COLLECTING AND SEPARATING WATER AND VENTILATION AIR FROM A MOTOR VEHICLE HABITACLE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2896743B1 (en) * 2006-01-31 2008-07-25 Peugeot Citroen Automobiles Sa ACOUSTIC PROTECTIVE DEVICE FOR A MOTOR VEHICLE BODY
FR3021008B1 (en) * 2014-05-19 2016-06-24 Centre D'etude Et De Rech Pour L'automobile (Cera) DEVICE FOR COLLECTING AND SEPARATING WATER AND VENTILATION AIR FROM A MOTOR VEHICLE HABITACLE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10261081B3 (en) * 2002-12-20 2004-02-19 Carcoustics Tech Center Gmbh Air intake channel, for a vehicle IC motor, has a plastics channel body with sound-absorbent wall inserts, with their edges encapsulated in the injection molding of the body in a positive fit
WO2005030532A1 (en) * 2003-09-23 2005-04-07 Aksys Gmbh Method and device for soundproofing and design therefor, especially for motor vehicles
DE20320100U1 (en) * 2003-12-23 2005-05-12 Carcoustics Tech Center Gmbh Airborne sound absorbing component
WO2012119654A1 (en) * 2011-03-09 2012-09-13 Autoneum Management Ag Automotive noise attenuating trim part
JP2014085421A (en) * 2012-10-22 2014-05-12 Inoac Corp Sound absorbing structure
FR3027817A1 (en) * 2014-10-29 2016-05-06 Centre D'etude Et De Rech Pour L'automobile (Cera) DEVICE FOR COLLECTING AND SEPARATING WATER AND VENTILATION AIR FROM A MOTOR VEHICLE HABITACLE

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FR3052396A1 (en) 2017-12-15

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