WO2002103195A1 - Plastic-based air inlet system element of an internal combustion engine - Google Patents

Plastic-based air inlet system element of an internal combustion engine Download PDF

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Publication number
WO2002103195A1
WO2002103195A1 PCT/EP2002/006570 EP0206570W WO02103195A1 WO 2002103195 A1 WO2002103195 A1 WO 2002103195A1 EP 0206570 W EP0206570 W EP 0206570W WO 02103195 A1 WO02103195 A1 WO 02103195A1
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WO
WIPO (PCT)
Prior art keywords
internal combustion
combustion engine
element according
barite
plastic
Prior art date
Application number
PCT/EP2002/006570
Other languages
French (fr)
Inventor
Jean-Philippe Ory
Francis Pinier
Original Assignee
Filterwerk Mann+Hummel 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 Filterwerk Mann+Hummel Gmbh filed Critical Filterwerk Mann+Hummel Gmbh
Priority to DE10296845T priority Critical patent/DE10296845T5/en
Publication of WO2002103195A1 publication Critical patent/WO2002103195A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10314—Materials for intake systems
    • F02M35/10321—Plastics; Composites; Rubbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1034—Manufacturing and assembling intake systems
    • F02M35/10347—Moulding, casting or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1277—Reinforcement of walls, e.g. with ribs or laminates; Walls having air gaps or additional sound damping layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Definitions

  • the present invention relates to an element of an air intake system based on a plastic material of an internal combustion engine, as well as an air intake system comprising such an element and that an engine internal combustion equipped with such a system.
  • barite being a filler more than 10 times cheaper than glass fibers and often, than base resin
  • the present invention therefore relates to an element of an air intake system based on plastic material of an internal combustion engine whose plastic parts have an acoustic transparency and a reduced cost.
  • the present invention therefore relates to an element of an air intake system based on plastic material of an internal combustion engine having improved acoustic transparency thanks to the presence of barite.
  • acoustic transparency according to the present invention is meant the transmission of noise through a wall.
  • the present invention applies to any type of internal combustion engine, but preferably to multi-cylinder engines, such as those of vehicles and in particular, motor vehicles.
  • air intake system is meant to designate all of the elements which bring air to the engine. It generally comprises at least one air intake duct, an air filter, another duct and an intake manifold comprising a plenum (or common room) and a distributor for supplying air to each cylinder of the engine. It can also include a turbo system with appropriate ducts to bring in and exhaust air.
  • the element of the air intake system to which the present invention applies is an element whose dimensions, constituent material, conditions of use are such that it has an unacceptable level of acoustic transparency.
  • Such an element generally has a length / width ratio substantially different from 1 (for example at least 2, or even at least 5, and even at least 10). Indeed, for elements having a length / width ratio close to 1, the resonance problems are often more important than the acoustic transparency problems and in these elements there, the introduction of a load promoting the stiffness of the walls (such than glass fibers for example) is more advantageous. Note that different charges may be present in the same element, and in quantities to be optimized depending on the overall sound • emission and other properties of the specifications. Thus, barite can be combined with fibers or glass beads, talc, mica and any other type of usual filler for plastics.
  • the present invention preferably applies to a small diameter duct, such as an air intake or turbo inlet or outlet duct, but it can also be applied to an intake manifold. It advantageously applies to a turbo inlet duct, where the problems of acoustic transparency are particularly high and where the volume / surface ratio is effectively low.
  • the plastic material according to the present invention can be any material, thermoplastic or not. Preferably, it is a thermoplastic material and advantageously, an easily moldable thermoplastic material, for example by injection. Polyamide (PA) is an example of such a material, which also has the advantage of withstanding high temperatures.
  • the elements subjected to thermal stresses in the air intake systems are effectively based on PA, and most often on PA6, although PA66 or certain other PAs (PA 11, PA 12, PA 610 and PA MXD6) may also be suitable, alone or as a mixture.
  • the plastic may include any usual additive, such as an impact modifier, an antistatic agent, a dye, etc.
  • Barite or barium sulfate
  • the particle diameter is greater than or equal to 0.3 ⁇ m, or even 0.5 ⁇ m and preferably 1 ⁇ m. It is generally less than or equal to 250 ⁇ m, or even 150 ⁇ m, and preferably 50 ⁇ m.
  • a finer grain size generally promotes impact resistance.
  • Barite is generally present at a rate of 10% (by weight relative to the total weight of the element) or more, better: by 20% or more, and sometimes, by 30% and more. Too high barite contents lead to processing difficulties, and to impact resistance defects.
  • the barite content is generally less than or equal to 60%, preferably less than or equal to 50%, or even 40%. Note that the presence of barite makes it possible to reduce thermal shrinkage, shrinkage and to reduce the duration of the manufacturing cycles. It also leads to better dimensional stability, and to less water and oil intake.
  • the present invention also relates to an air intake system comprising an element having improved acoustic transparency as described above, as well as an internal combustion engine equipped with such an intake system.
  • this motor is equipped with plastic parts containing barite in the rooms where acoustic opacity is desired, and / or another reinforcement (such as glass fibers or talc) for the parts which must dissipate acoustic energy in the form of vibrations.
  • the resonators and filters can be based on a polymer (such as polypropylene, given the low thermal stresses) reinforced with talc, at a rate of 20%, even 40% minimum.
  • barite alone can be enough to give the mechanical strength and the required acoustic properties to a suitable polymer, such as PA.
  • PA a suitable polymer

Abstract

The invention relates to a plastic-based element of an air inlet system of an internal combustion engine with an acoustic transparency which is improved due to the presence of barite.

Description

Elément d'un système d'admission d'air à base de matière plastique d'un moteur à combustion interneElement of a plastic-based air intake system of an internal combustion engine
La présente invention concerne un élément d'un système d'admission d'air à base de matière plastique d'un moteur à combustion interne, ainsi qu'un système d'admission d'air comprenant un tel élément et qu'un moteur à combustion interne équipé d'un tel système.The present invention relates to an element of an air intake system based on a plastic material of an internal combustion engine, as well as an air intake system comprising such an element and that an engine internal combustion equipped with such a system.
Depuis de nombreuses années, la tendance en matière de pièces sous le capot des automobiles est au remplacement des pièces métalliques par des pièces en matière plastique, plus légères et plus faciles à mouler en des pièces complexes intégrant un maximum de fonctions. Toutefois, de par leur légèreté, ces matières plastiques mènent à des problèmes acoustiques et il est donc connu d'augmenter leur densité au moyen de charges minérales diverses.For many years, the trend in parts under the hood of automobiles has been to replace metal parts with plastic parts, which are lighter and easier to mold into complex parts incorporating a maximum of functions. However, due to their lightness, these plastics lead to acoustic problems and it is therefore known to increase their density by means of various mineral fillers.
Ainsi, dans le brevet US 4,980,407, une solution permettant d'augmenter la dissipation acoustique par vibrations dans des pièces à base de polyamide est proposée. Celle-ci consiste au choix d'un alliage particulier de divers polyamides, au lieu d'une résine unique. II y est recommandé de charger cet alliage avec des matières de charge diverses, telles que des fibres de verre, du talc, du mica, du sulfate de baryum..., les fibres de verre étant préférées pour leur efficacité accrue en tant que renfort mécanique. La demanderesse a toutefois constaté que, de manière surprenante, si les fibres de verre permettent en effet d'augmenter la dissipation d'énergie acoustique par vibrations, elles augmentent par contre fortement la transparence acoustique. La demanderesse a trouvé qu'en ajoutant de la barytine comme matière de charge à un élément d'un système d'alimentation en air présentant un problème de transparence acoustique, on permettait de réduire ce problème, et ce avec de nombreux avantages :Thus, in US Pat. No. 4,980,407, a solution making it possible to increase the acoustic dissipation by vibration in parts based on polyamide is proposed. This consists of choosing a particular alloy of various polyamides, instead of a single resin. It is recommended to load this alloy with various filler materials, such as glass fibers, talc, mica, barium sulphate, etc., glass fibers being preferred for their increased effectiveness as a reinforcement. mechanical. The Applicant has however noted that, surprisingly, if the glass fibers indeed make it possible to increase the dissipation of acoustic energy by vibration, they on the other hand greatly increase the acoustic transparency. The Applicant has found that by adding barite as a filler to an element of an air supply system exhibiting a problem of acoustic transparency, it was possible to reduce this problem, and this with numerous advantages:
- coût matière réduit, la barytine étant une charge plus de 10 fois moins chère que les fibres de verre et souvent, que la résine de base- reduced material cost, barite being a filler more than 10 times cheaper than glass fibers and often, than base resin
- mise en œuvre plus aisée et de durée réduite par rapport aux autres renforts - faible absorption d'eau, la barytine étant hydrophobe, et d'huile- easier implementation and shorter duration compared to other reinforcements - low water absorption, barite being hydrophobic, and oil
- bonne stabilité dimensionnelle (faible retrait et peu de retassures).- good dimensional stability (low shrinkage and few shrinkage).
La présente invention a donc pour objet un élément d'un système d'admission d'air à base de matière plastique d'un moteur à combustion interne dont les pièces en matière plastique présentent une transparence acoustique et un coût réduit.The present invention therefore relates to an element of an air intake system based on plastic material of an internal combustion engine whose plastic parts have an acoustic transparency and a reduced cost.
La présente invention concerne dès lors un élément d'un système d'admission d'air à base de matière plastique d'un moteur à combustion interne présentant une transparence acoustique améliorée grâce à la présence de barytine. Par transparence acoustique selon la présente invention, on entend désigner la transmission de bruit au travers d'une paroi.The present invention therefore relates to an element of an air intake system based on plastic material of an internal combustion engine having improved acoustic transparency thanks to the presence of barite. By acoustic transparency according to the present invention is meant the transmission of noise through a wall.
La présente invention s'applique à tout type de moteur à combustion interne, mais de préférence à des moteurs multicylindres, tels que ceux des véhicules et en particulier, des véhicules automobiles.The present invention applies to any type of internal combustion engine, but preferably to multi-cylinder engines, such as those of vehicles and in particular, motor vehicles.
Par système d'admission d'air selon la présente invention, on entend désigner l'ensemble des éléments qui amènent l'air vers le moteur. Il comprend généralement au moins un conduit d'admission d'air, un filtre à air, un autre conduit et un collecteur d'admission comprenant un plénum (ou chambre commune) et un répartiteur pour amener l'air vers chaque cylindre du moteur. Il peut également comprendre un système turbo avec des conduits appropriés pour y amener et évacuer l'air. L'élément du système d'admission d'air auquel s'applique la présente invention est un élément dont les dimensions, la matière constitutive, les conditions d'utilisation sont telles qu'il présente un niveau de transparence acoustique inacceptable.By air intake system according to the present invention is meant to designate all of the elements which bring air to the engine. It generally comprises at least one air intake duct, an air filter, another duct and an intake manifold comprising a plenum (or common room) and a distributor for supplying air to each cylinder of the engine. It can also include a turbo system with appropriate ducts to bring in and exhaust air. The element of the air intake system to which the present invention applies is an element whose dimensions, constituent material, conditions of use are such that it has an unacceptable level of acoustic transparency.
Un tel élément présente généralement un rapport longueur/largeur sensiblement différent de 1 (par exemple d'au moins 2, voire au moins 5, et même au moins 10). En effet, pour des éléments ayant un rapport longueur/largeur proche de 1 , les problèmes de résonance sont souvent plus importants que les problèmes de transparence acoustique et dans ces éléments là, l'introduction d'une charge favorisant la raideur des parois (telle que les fibres de verre par exemple) est plus avantageuse. A noter que différentes charges peuvent être présentes dans un même élément, et ce en des quantités à optimiser en fonction de l'émission •sonore globale et des autres propriétés du cahier des charges. Ainsi, la barytine peut être combinée à des fibres ou des billes de verre, à du talc, du mica et tout autre type de charge usuelle pour les matières plastiques. La présente invention s'applique de préférence à un conduit de faible diamètre, tel qu'un conduit d'admission d'air ou d'entrée ou de sortie turbo, mais elle peut également s'appliquer à un collecteur d'admission. Elle s'applique avantageusement à un conduit d'entrée turbo, où les problèmes de transparence acoustique sont particulièrement élevés et où le rapport volume/surface est effectivement faible. La matière plastique selon la présente invention peut être une matière quelconque, thermoplastique ou non. De préférence, il s'agit d'une matière thermoplastique et avantageusement, d'une matière thermoplastique aisément moulable, par exemple par injection. Le polyamide (PA) est un exemple d'un tel matériau, qui présente en outre l'avantage de résister à des températures élevées. Généralement, les éléments soumis à des sollicitations thermiques dans les systèmes d'admission d'air sont effectivement à base de PA, et le plus souvent de PA6, bien que le PA66 ou certains autres PA (PA 11 , PA 12, PA 610 et PA MXD6) puissent également convenir, seuls ou en mélange. La matière plastique peut comprendre tout additif usuel, tel qu'un modifiant choc, un agent antistatique, un colorant ...Such an element generally has a length / width ratio substantially different from 1 (for example at least 2, or even at least 5, and even at least 10). Indeed, for elements having a length / width ratio close to 1, the resonance problems are often more important than the acoustic transparency problems and in these elements there, the introduction of a load promoting the stiffness of the walls (such than glass fibers for example) is more advantageous. Note that different charges may be present in the same element, and in quantities to be optimized depending on the overall sound • emission and other properties of the specifications. Thus, barite can be combined with fibers or glass beads, talc, mica and any other type of usual filler for plastics. The present invention preferably applies to a small diameter duct, such as an air intake or turbo inlet or outlet duct, but it can also be applied to an intake manifold. It advantageously applies to a turbo inlet duct, where the problems of acoustic transparency are particularly high and where the volume / surface ratio is effectively low. The plastic material according to the present invention can be any material, thermoplastic or not. Preferably, it is a thermoplastic material and advantageously, an easily moldable thermoplastic material, for example by injection. Polyamide (PA) is an example of such a material, which also has the advantage of withstanding high temperatures. Generally, the elements subjected to thermal stresses in the air intake systems are effectively based on PA, and most often on PA6, although PA66 or certain other PAs (PA 11, PA 12, PA 610 and PA MXD6) may also be suitable, alone or as a mixture. The plastic may include any usual additive, such as an impact modifier, an antistatic agent, a dye, etc.
La barytine, ou sulfate de baryum, est généralement sous forme de particules ayant une granulométrie que l'homme de métier adaptera aisément aux propriétés (notamment mécaniques) requises. Généralement, le diamètre des particules est supérieur ou égal à 0.3 μm, voire à 0.5 μm et de préférence à 1 μm. Il est généralement inférieur ou égal à 250 μm, voire à 150 μm, et de préférence à 50 μm. Une granulométrie plus fine favorise généralement la résistance au choc. La barytine est généralement présente à raison de 10% (en poids par rapport au poids total de l'élément) ou plus, mieux : de 20% ou plus, et parfois, de 30% et plus. Des teneurs trop élevées en barytine mènent à des difficultés de mise en œuvre, et à des défauts de résistance au choc. En conséquence, la teneur en barytine est généralement inférieure ou égale à 60%, de préférence inférieure ou égale à 50%, voire à 40%. A noter que la présence de barytine permet de diminuer le retrait thermique, les retassures et de diminuer la durée des cycles de fabrication. Elle mène également à une meilleure stabilité dimensionnelle, et à une moindre prise d'eau et d'huile.Barite, or barium sulfate, is generally in the form of particles having a particle size which a person skilled in the art will easily adapt to the required properties (in particular mechanical). Generally, the particle diameter is greater than or equal to 0.3 μm, or even 0.5 μm and preferably 1 μm. It is generally less than or equal to 250 μm, or even 150 μm, and preferably 50 μm. A finer grain size generally promotes impact resistance. Barite is generally present at a rate of 10% (by weight relative to the total weight of the element) or more, better: by 20% or more, and sometimes, by 30% and more. Too high barite contents lead to processing difficulties, and to impact resistance defects. Consequently, the barite content is generally less than or equal to 60%, preferably less than or equal to 50%, or even 40%. Note that the presence of barite makes it possible to reduce thermal shrinkage, shrinkage and to reduce the duration of the manufacturing cycles. It also leads to better dimensional stability, and to less water and oil intake.
La présente invention concerne également un système d'admission d'air comprenant un élément présentant une transparence acoustique améliorée tel que décrit précédemment, ainsi qu'un moteur à combustion interne équipé d'un tel système d'admission. Avantageusement, ce moteur est équipé avec des pièces en matière plastique contenant de la barytine dans les pièces où l'opacité acoustique est souhaitée, et/ou un autre renfort (tel que les fibres de verre ou le talc) pour les pièces qui doivent dissiper l'énergie acoustique sous forme de vibrations. Ainsi par exemple, les résonateurs et les filtres peuvent être à base d'un polymère (tel que le polypropylène, étant donné les sollicitations thermiques faibles) renforcé de talc, à raison de 20%, voire 40% minimum. Par contre, pour les pièces où la rigidité est primordiale (telles que les couvre-culasses), la barytine seule peut suffire à conférer la résistance mécanique et les propriétés acoustiques requises à un polymère adéquat, tel que le PA. A noter une fois de plus que les divers types de charges peuvent être combinés pour optimiser l'émission sonore globale, mais que l'augmentation du taux de barytine est favorable d'un point de vue économique. The present invention also relates to an air intake system comprising an element having improved acoustic transparency as described above, as well as an internal combustion engine equipped with such an intake system. Advantageously, this motor is equipped with plastic parts containing barite in the rooms where acoustic opacity is desired, and / or another reinforcement (such as glass fibers or talc) for the parts which must dissipate acoustic energy in the form of vibrations. For example, the resonators and filters can be based on a polymer (such as polypropylene, given the low thermal stresses) reinforced with talc, at a rate of 20%, even 40% minimum. However, for rooms where the rigidity is essential (such as cylinder head covers), barite alone can be enough to give the mechanical strength and the required acoustic properties to a suitable polymer, such as PA. It should be noted once again that the various types of fillers can be combined to optimize the overall sound emission, but that the increase in the rate of barite is favorable from an economic point of view.

Claims

R E V E N D I C A T I O N SR E V E N D I C A T I O N S
1 -Elément d'un système d'admission d'air à base de matière plastique d'un moteur à combustion interne présentant une transparence acoustique améliorée, caractérisé en ce qu'il comprend de la barytine.1 - Element of an air intake system based on a plastic material of an internal combustion engine having improved acoustic transparency, characterized in that it comprises barite.
2 - Elément selon la revendication 1 , caractérisé en ce qu'il présente un rapport longueur/largeur sensiblement différent de 1.2 - Element according to claim 1, characterized in that it has a length / width ratio substantially different from 1.
3 - Elément selon la revendication 2, qui est un conduit d'admission d'air et/ou un conduit d'entrée turbo et/ou un conduit de sortie turbo et/ou un collecteur d'admission.3 - Element according to claim 2, which is an air intake duct and / or a turbo inlet duct and / or a turbo outlet duct and / or an intake manifold.
4 - Elément selon la revendication 3, qui est un conduit d'entrée turbo.4 - Element according to claim 3, which is a turbo inlet pipe.
5 - Elément selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend en outre des fibres de verre.5 - Element according to any one of the preceding claims, characterized in that it further comprises glass fibers.
6 — Elément selon l'une quelconque des revendications précédentes, caractérisé en ce que la matière plastique est un polyamide (PA).6 - Element according to any one of the preceding claims, characterized in that the plastic is a polyamide (PA).
7 - Elément selon l'une quelconque des revendications précédentes, caractérisé en ce que la barytine est constituée de particules ayant un diamètre de 0.3 à 250 μm.7 - Element according to any one of the preceding claims, characterized in that the barite consists of particles having a diameter of 0.3 to 250 μm.
8 - Elément selon l'une quelconque des revendications précédentes, caractérisé en ce que la barytine est incorporée à raison de 10 à 60% par rapport au poids total de l'élément.8 - Element according to any one of the preceding claims, characterized in that the barite is incorporated in an amount of 10 to 60% relative to the total weight of the element.
9 - Système d'admission d'air d'un moteur à combustion interne comprenant un élément selon l'une quelconque des revendications précédentes.9 - Air intake system of an internal combustion engine comprising an element according to any one of the preceding claims.
10 - Moteur à combustion interne équipé d'un système d'admission d'air selon la revendication 9. 10 - Internal combustion engine equipped with an air intake system according to claim 9.
PCT/EP2002/006570 2001-06-15 2002-06-14 Plastic-based air inlet system element of an internal combustion engine WO2002103195A1 (en)

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DE10296845T DE10296845T5 (en) 2001-06-15 2002-06-14 Element of an air intake system based on plastic of an internal combustion engine

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FR0108002A FR2826062B1 (en) 2001-06-15 2001-06-15 ELEMENT OF AN AIR INTAKE SYSTEM BASED ON A PLASTIC MATERIAL OF AN INTERNAL COMBUSTION ENGINE
FR01/08002 2001-06-15

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FR2826062A1 (en) 2002-12-20
DE10296845T5 (en) 2004-05-06
FR2826062B1 (en) 2004-02-20

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