EP3623599B1 - 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
EP3623599B1
EP3623599B1 EP19196502.9A EP19196502A EP3623599B1 EP 3623599 B1 EP3623599 B1 EP 3623599B1 EP 19196502 A EP19196502 A EP 19196502A EP 3623599 B1 EP3623599 B1 EP 3623599B1
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EP
European Patent Office
Prior art keywords
protection device
plates
plate
acoustic
protection
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EP19196502.9A
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German (de)
French (fr)
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EP3623599A1 (en
Inventor
Valentin FRADET
Stephane Decaux
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Renault SAS
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Renault SAS
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Publication of EP3623599A1 publication Critical patent/EP3623599A1/en
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Publication of EP3623599B1 publication Critical patent/EP3623599B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/0004—Oilsumps
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/0004—Oilsumps
    • F01M2011/0008—Oilsumps with means for reducing vibrations
    • F01M2011/0012—Oilsumps with means for reducing vibrations with acoustic insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/0004—Oilsumps
    • F01M2011/0087—Sump being made of different parts

Definitions

  • the present invention relates to a motor vehicle engine
  • the present invention relates more particularly to a thin acoustic protection device intended to be placed against an engine casing wall and surrounding said heat engine of a motor vehicle.
  • an acoustic protection device is arranged against a wall of an engine casing to provide acoustic insulation against noise generated by the operation of the engine.
  • Said device generally comprises a plate substantially matching a wall of said casing and fixed to said wall by fixing means which may be quick fixing means.
  • FR2982559-A1 thus proposes a thin acoustic protection device intended to be placed against an engine casing wall using an adhesive and comprising two layers of acoustic insulation.
  • FR2061052 A5 and JPH08218889A describe other known examples of crankcase sound insulation.
  • a disadvantage of these protection devices is their fixing against the wall of the motor casing, said motor is the seat of many vibrations which can generate over time play between the acoustic protection and the motor casing, which reduces efficiency. and maintaining protection.
  • Clearances can form at the junction of two protective plates which can become separated from each other to form discontinuities of acoustic protection detrimental to the efficiency of the assembly.
  • the publication CN105421826-A thus proposes a fixing of the ends of acoustic plates between them with rigid connections which requires a consequent thickness of the layer of acoustic protection as well as human handling.
  • the object of the invention is to remedy these problems and one of the objects of the invention is an acoustic protection device to overcome the problems of the state of the art.
  • the object of the invention is more particularly an acoustic protection device for a heat engine of a motor vehicle comprising acoustic protection plates, with a system for fixing said plates to the wall of the casing of said engine, capable of ensuring the connection between said plates to form a device surrounding the motor housing in one piece easy to fix on said housing.
  • the present invention relates more particularly to a device for acoustic protection of a motor vehicle engine oil sump, characterized in that said device comprises a box composed of acoustic protection plates covering said sump, each of the plates comprising a first end longitudinal having a reversible interlocking system in a second longitudinal end of the adjacent juxtaposed plate.
  • the acoustic protection device comprises a casing composed of protective plates covering the walls of the engine casing, each of the plates comprising a first longitudinal end having a reversible interlocking system in a second longitudinal end of a juxtaposed neighboring plate.
  • Said plates once assembled, thus have contiguous ends and thus form a single-piece and rigid acoustic protection box, suitable for covering the oil sump of the engine.
  • the casing can advantageously be easily disassembled to provide easy access to the engine, in particular during repairs.
  • the plate is made from sound insulation material by molding to facilitate obtaining the plate with its connecting means.
  • longitudinal, vertical are relative to an orthonormal frame of reference, the horizontal plane of which may be parallel to the horizontal junction plane between various elements of the engine, including a cylinder block and a cylinder head.
  • a thermal or internal combustion engine (not shown) comprises an oil sump 50 arranged below a cylinder block of said engine.
  • the oil sump 50 is surrounded by an acoustic protection device 100 comprising a box 10, over the entire free lower surface of the oil sump 50 in order to reduce the noise generated during the operation of the engine, towards the outside of the vehicle.
  • the box 10 is made up of several acoustic protection plates 11 including three vertical plates 12 and a lower plate 14.
  • each of the three vertical plates 12 is shaped to be pressed with a minimum of play against the vertical walls 51 of the oil sump.
  • the vertical plate 12 can thus comprise a tubular protuberance 15 in the continuity of a passage for fixing screws along a vertical axis, from the oil sump to the cylinder block in order to fill spaces and have zones of contact with the wall of the oil sump to best ensure the acoustic protection of said sump.
  • Bottom plate 14 is shaped to cover bottom wall 52 of the oil pan.
  • Said lower plate 14 thus has a through hole 13 intended to be opposite an oil sump drain hole.
  • Said orifice 13 may be surrounded by a convex recess 16 facing the oil sump 50 to guide the flow of oil during the purge and to avoid soiling the lower plate 14 for acoustic protection.
  • Each of the vertical plates 12 and the lower plate 14 comprise fixing through holes 17 intended to be traversed by quick fixing pins 53. These pins are preferably driven into holes dug in the wall of the oil sump 50.
  • the fixing pins 53 facilitate the installation of the acoustic protection plates 12,14, by pressing said plates against the walls of the oil sump.
  • each of the vertical plates 12 for acoustic protection has a first longitudinal end 18 having an interlocking system 20 with a second longitudinal end 19 of a juxtaposed neighboring plate.
  • the first end of a plate thus covers the edge 32 or the thickness of the end of the juxtaposed neighboring plate.
  • the first end 18 of the plate has a blister 21 in the form of a hook 25.
  • said hook has a profile in the shape of a trapezoid like a tenon 22 and the adjacent plate has a cavity 23 at its longitudinal end 19 opposite, here a groove in the form of a mortise 24.
  • the mortise 24 is adapted to accommodate and house the tenon 22.
  • the tenon 22 and the mortise 24 are of complementary shape.
  • the tenon 22 extends from the edge 32 of the end 18 of the protection plate 12.
  • the interlocking system 20 allows a simple, well-known dovetail assembly of the two neighboring plates, in particular the vertical plates 12.
  • the interlocking system allows the fixing at an angle and the maintenance of the ends 18,19 of the two adjacent and juxtaposed plates. The assembly can then be disassembled effortlessly.
  • the first end 18 of the vertical plate 12 comprises a blister 21 in the form of a hook 25 having a curvature; said hook extends substantially along the edge of the end 18 of the vertical plate 12.
  • the neighboring plate has a cavity 23 facing said blister adapted to accommodate said hook and allow the hooking and the blocking of said hook 25.
  • the cavity 23 preferably extends parallel to the vertical edge of the end 19 of the neighboring plate.
  • the interlocking system 20 allows the fixing at an angle and the maintenance of the ends 18,19 of the two adjacent and juxtaposed plates, in particular the vertical plates 12 of the acoustic protection box 10. The assembly can then be disassembled without effort.
  • the lower plate 14 comprises a substantially horizontal and flat part 27 extended by substantially vertical walls 28.
  • Said vertical walls 28 comprise at the end a reception sidewalk 29 adapted to receive the edge or the thickness of the vertical plates 12.
  • Said lower plate 14 comprises a vertical blister 21' which extends substantially from the reception sidewalk 29 in the direction of the vertical plates 12.
  • the reception sidewalk 29 represents the edge 32 of the end of the lower plate 14.
  • Said vertical plates 12 have on their side a recess or receiving cavity 23', here a hollow to house the vertical blister 21'.
  • the vertical blister 21' and the receiving depression 23' are of complementary form.
  • the vertical blister 21' carries a toothing 31 which surrounds the entire blister 21' around a vertical axis to improve the attachment with the vertical walls, here in the recess 23' for reception.
  • the lower plate 14 can thus be fitted into the vertical plates 12.
  • the blister 21, 21' is made in one piece with the acoustic protection plate 12,14 by molding. Obtaining the plate with the blister 21,21' is easy.
  • the protection plate is made of acoustic insulation material to facilitate its obtaining.
  • the vertical plates can be fixed together thanks to the interlocking system. Then we will fix the lower plate with the vertical plates by pushing the vertical blisters into the cavities 23,23' for reception.
  • Said vertical 12 and lower 14 plates assembled together form a box 14 for substantially rigid acoustic protection thanks to the interlocking system 20 of a plate 12,14 in the juxtaposed neighboring plate. The assembly is however easily removable.
  • the box 10 is fixed to the oil sump by pushing the fixing pins 53 through the fixing holes 17 of the acoustic protection plates 12,14 into the holes provided in the oil sump.
  • the box 10 is then fixed against the oil sump with a continuity of the walls to optimize the acoustic insulation.
  • the acoustic protection device 10 allows a covering of the oil sump with a covering of the protective walls to ensure optimum acoustic protection thanks to the acoustic protection box adapted to cover the free walls of the oil sump .
  • the interlocking system of the device facilitates on the one hand the manufacture of each of the plates forming the casing and their installation and on the other hand the dismantling of the casing to have access to the oil sump during of repairs.
  • the obtaining of acoustic protection plates can call upon three-dimensional printing techniques.
  • the interlocking system can include other different means.
  • the blister can comprise a rod with a stopper at its end such as a ball to be pushed into the reception hole of the adjacent juxtaposed plate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Body Structure For Vehicles (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention La présente invention concerne un moteur de véhicule automobileThe present invention relates to a motor vehicle engine

La présente invention concerne plus particulièrement un dispositif mince de protection acoustique destiné à être disposé contre une paroi de carter de moteur et entourant ledit moteur thermique de véhicule automobile.The present invention relates more particularly to a thin acoustic protection device intended to be placed against an engine casing wall and surrounding said heat engine of a motor vehicle.

Etat de la techniqueState of the art

De manière connue, un dispositif de protection acoustique est disposé contre une paroi d'un carter de moteur pour fournir une isolation acoustique contre des bruits générés par le fonctionnement du moteur. Ledit dispositif comprend généralement une plaque épousant sensiblement une paroi dudit carter et fixée à ladite paroi par des moyens de fixation qui peuvent être des moyens de fixation rapide.In known manner, an acoustic protection device is arranged against a wall of an engine casing to provide acoustic insulation against noise generated by the operation of the engine. Said device generally comprises a plate substantially matching a wall of said casing and fixed to said wall by fixing means which may be quick fixing means.

Il est connu de réaliser une protection acoustique d'un moteur de véhicule automobile par application autour dudit moteur d'un ou plusieurs panneaux poreux ou comprenant une couche de matériau lourd disposé sur une couche élastique. Les épaisseurs des différentes couches entrainent une augmentation de l'encombrement global dudit moteur incompatible avec la compacité des compartiments moteur dans lequel ledit moteur est implanté.It is known to provide acoustic protection for a motor vehicle engine by applying around said engine one or more porous panels or panels comprising a layer of heavy material placed on an elastic layer. The thicknesses of the different layers lead to an increase in the overall size of said engine incompatible with the compactness of the engine compartments in which said engine is installed.

Il est aussi connu de réaliser une protection acoustique d'un élément de moteur thermique avec des plaques minces apposées contre la paroi du carter dudit moteur. La publication FR2982559-A1 propose ainsi un dispositif mince de protection acoustique destiné à être disposé contre une paroi de carter de moteur grâce à un adhésif et comprenant deux couches d'isolant acoustique. FR2061052 A5 et JPH08218889 A décrivent d'autres exemples connus de protection acoustique du carter.It is also known to provide acoustic protection for a heat engine element with thin plates affixed against the wall of the casing of said engine. The publication FR2982559-A1 thus proposes a thin acoustic protection device intended to be placed against an engine casing wall using an adhesive and comprising two layers of acoustic insulation. FR2061052 A5 and JPH08218889A describe other known examples of crankcase sound insulation.

Un inconvénient de ces dispositifs de protection est leur fixation contre la paroi du carter du moteur, ledit moteur est le siège de nombreuses vibrations qui peuvent générer avec le temps des jeux entre la protection acoustique et le carter du moteur, ce qui réduit l'efficacité et le maintien de la protection.A disadvantage of these protection devices is their fixing against the wall of the motor casing, said motor is the seat of many vibrations which can generate over time play between the acoustic protection and the motor casing, which reduces efficiency. and maintaining protection.

Les jeux peuvent se former à la jonction de deux plaques de protection qui peuvent se désolidariser l'une de l'autre pour former des discontinuités de protection acoustique nuisant à l'efficacité de l'ensemble.Clearances can form at the junction of two protective plates which can become separated from each other to form discontinuities of acoustic protection detrimental to the efficiency of the assembly.

La publication CN105421826-A propose ainsi une fixation des extrémités de plaques acoustiques entre elles avec des raccords rigides qui nécessite une épaisseur conséquente de la couche de protection acoustique ainsi qu'une manipulation humaine.The publication CN105421826-A thus proposes a fixing of the ends of acoustic plates between them with rigid connections which requires a consequent thickness of the layer of acoustic protection as well as human handling.

Le but de l'invention est de remédier à ces problèmes et un des objets de l'invention est un dispositif de protection acoustique pour pallier les problèmes de l'état de l'art.The object of the invention is to remedy these problems and one of the objects of the invention is an acoustic protection device to overcome the problems of the state of the art.

L'objet de l'invention est plus particulièrement un dispositif de protection acoustique pour un moteur thermique de véhicule automobile comprenant des plaques de protection acoustique, avec un système de fixation desdites plaques à la paroi du carter dudit moteur, apte à assurer le raccord entre lesdites plaques afin de former un dispositif entourant le carter de moteur d'un seul tenant facile à fixer sur ledit carter.The object of the invention is more particularly an acoustic protection device for a heat engine of a motor vehicle comprising acoustic protection plates, with a system for fixing said plates to the wall of the casing of said engine, capable of ensuring the connection between said plates to form a device surrounding the motor housing in one piece easy to fix on said housing.

Présentation de l'inventionPresentation of the invention

La présente invention concerne plus particulièrement un dispositif de protection acoustique d'un carter d'huile de moteur de véhicule automobile, caractérisé en ce que ledit dispositif comprend un caisson composé de plaques de protection acoustiques recouvrant ledit carter, chacune des plaques comportant une première extrémité longitudinale présentant un système d'emboitement réversible dans une deuxième extrémité longitudinale de la plaque voisine juxtaposée.The present invention relates more particularly to a device for acoustic protection of a motor vehicle engine oil sump, characterized in that said device comprises a box composed of acoustic protection plates covering said sump, each of the plates comprising a first end longitudinal having a reversible interlocking system in a second longitudinal end of the adjacent juxtaposed plate.

De manière avantageuse, le dispositif de protection acoustique comprend un caisson composé de plaques de protection recouvrant les parois du carter du moteur, chacune des plaques comportant une première extrémité longitudinale présentant un système d'emboitement réversible dans une deuxième extrémité longitudinale d'une plaque voisine juxtaposée.Advantageously, the acoustic protection device comprises a casing composed of protective plates covering the walls of the engine casing, each of the plates comprising a first longitudinal end having a reversible interlocking system in a second longitudinal end of a juxtaposed neighboring plate.

Lesdites plaques une fois assemblées présentent ainsi des extrémités jointives et forment ainsi un caisson de protection acoustique d'un seul tenant et rigide, adapté à recouvrir le carter d'huile du moteur.Said plates, once assembled, thus have contiguous ends and thus form a single-piece and rigid acoustic protection box, suitable for covering the oil sump of the engine.

Le caisson peut de manière avantageuse être facilement démonté pour présenter un accès facile au moteur notamment lors de réparations.The casing can advantageously be easily disassembled to provide easy access to the engine, in particular during repairs.

Selon d'autres caractéristiques de l'invention :

  • le système d'emboitement comprend une boursoufflure dans la première extrémité longitudinale de la plaque adaptée pour être reçue dans une cavité creusée dans la deuxième extrémité de la plaque voisine juxtaposée.
According to other characteristics of the invention:
  • the interlocking system comprises a blister in the first longitudinal end of the plate adapted to be received in a cavity hollowed out in the second end of the adjacent juxtaposed plate.

Le système d'emboitement comprend une boursoufflure dans la première extrémité de la plaque, laquelle boursoufflure est adaptée pour être enfoncée dans une cavité en vis-à-vis avec la boursoufflure, creusé dans la deuxième extrémité de la plaque voisine juxtaposée. La liaison permet alors le maintien des deux plaques en position l'une par rapport à l'autre pour former le caisson rigide. La boursoufflure peut ensuite être retirée de la cavité sans endommager les plaques en contact.

  • la boursoufflure s'étend depuis la tranche de l'extrémité longitudinale de la plaque.
The interlocking system comprises a blister in the first end of the plate, which blister is adapted to be pushed into a cavity facing the blister, hollowed out in the second end of the juxtaposed neighboring plate. The connection then allows the maintenance of the two plates in position relative to each other to form the rigid box. The blister can then be removed from the cavity without damaging the mating plates.
  • the blister extends from the edge of the longitudinal end of the plate.

De manière avantageuse, la boursoufflure s'étend depuis la tranche de l'extrémité longitudinale de la plaque pour assurer une liaison de bord à bord simple avec la plaque juxtaposée.

  • la boursoufflure et la cavité sont de forme complémentaire.
Advantageously, the blister extends from the edge of the longitudinal end of the plate to ensure a simple edge-to-edge connection with the juxtaposed plate.
  • the blister and the cavity are complementary in shape.

De manière avantageuse, la boursoufflure et la cavité sont de forme complémentaire pour assurer une liaison d'ajustement sensiblement serré sans jeu entre les plaques et permettre d'entourer le carter de l'élément du moteur de manière proche.

  • la boursoufflure comporte un crochet.
Advantageously, the blister and the cavity are of complementary shape to provide a substantially interference-fit connection without play between the plates and to allow the casing of the motor element to be closely surrounded.
  • the blister has a hook.

La boursoufflure comporte un crochet pour permettre l'accrochage avec la plaque juxtaposée et le maintien de l'ensemble des plaques pour entourer l'élément de moteur.

  • le crochet présente une courbure.
  • le crochet porte une denture entourant la boursoufflure.
  • le crochet présente un profil trapézoïdal.
The blister has a hook to allow the attachment with the juxtaposed plate and the maintenance of all the plates to surround the engine element.
  • the hook has a curvature.
  • the hook carries a toothing surrounding the blister.
  • the hook has a trapezoidal profile.

De manière avantageuse, le crochet peut présenter différentes formes pour assurer un accrochage entre les plaques de protection acoustique, ledit accrochage pouvant être facilement démontable.

  • la boursoufflure et la cavité forme une liaison en queue d'aronde.
Advantageously, the hook can have different shapes to ensure attachment between the acoustic protection plates, said attachment being easily removable.
  • the blister and the cavity form a dovetail connection.

De manière avantageuse, la boursoufflure et la cavité forme une liaison en queue d'aronde pour assurer le maintien de la liaison sans jeu entre deux plaques juxtaposées.

  • la boursoufflure est issue de matière avec la plaque.
Advantageously, the blister and the cavity form a dovetail connection to maintain the connection without clearance between two juxtaposed plates.
  • the blister is made in one piece with the plate.

De manière avantageuse, la boursoufflure est issue de matière avec la plaque pour faciliter l'obtention de la plaque et d'assurer la continuité de l'isolation acoustique.

  • chacune des plaques comporte au moins un orifice traversant destiné à être traversé par un moyen de fixation rapide à la paroi verticale du carter.
Advantageously, the blister is made in one piece with the plate to facilitate obtaining the plate and to ensure the continuity of the acoustic insulation.
  • each of the plates has at least one through hole intended to be passed through by a means of rapid attachment to the vertical wall of the casing.

De manière avantageuse, chacune des plaques est fixée au carter de l'élément du moteur par des orifices traversant destinés à être traversés par des moyens de fixation rapide, notamment des clips. De cette façon avantageuse, le caisson est fixé de manière démontable au carter de l'élément du moteur. Ledit caisson est composé de plaques de protection acoustique reliées l'une à l'autre de manière réversible pour permettre un démontage et remontage aisé.

  • la plaque est issue de matière d'isolation acoustique par moulage.
Advantageously, each of the plates is fixed to the casing of the motor element by through-holes intended to be crossed by quick-fastening means, in particular clips. In this advantageous way, the box is removably fixed to the casing of the motor element. Said box is composed of acoustic protection plates connected to each other in a reversible manner to allow easy dismantling and reassembly.
  • the plate is made from sound insulation material by molding.

De manière avantageuse, la plaque est issue de matière d'isolation acoustique par moulage pour faciliter l'obtention de la plaque avec ses moyens de liaison.Advantageously, the plate is made from sound insulation material by molding to facilitate obtaining the plate with its connecting means.

Brève description des figuresBrief description of figures

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés sur les dessins annexés, dans lesquels :

  • [Fig. 1] est une vue schématique d'un carter d'huile de moteur thermique avec un caisson de protection acoustique.
  • [Fig. 2] est une vue schématique du caisson de protection acoustique.
  • [Fig. 3] est une vue schématique des plaques de protection acoustiques verticales.
  • [Fig. 4] est une vue schématique la liaison de deux plaques de protection acoustique selon un premier mode de réalisation.
  • [Fig. 5] est une vue schématique de la liaison de deux plaques de protection acoustique selon le premier mode de réalisation.
  • [Fig. 6] est une vue schématique de la liaison de deux plaques de protection acoustique selon un deuxième mode de réalisation
  • [Fig. 6] est une vue schématique de la liaison de deux plaques de protection acoustique selon le deuxième mode de réalisation.
  • [Fig. 7] est une vue schématique de la plaque inférieure de protection acoustique fixée à une paroi verticale.
  • [Fig. 8] est une vue schématique de la plaque inférieure de protection acoustique.
Other characteristics and advantages of the invention will appear on reading the following description of particular embodiments of the invention given by way of non-limiting examples and represented in the appended drawings, in which:
  • [ Fig. 1 ] is a schematic view of a heat engine oil sump with an acoustic protection box.
  • [ Fig. 2 ] is a schematic view of the acoustic protection box.
  • [ Fig. 3 ] is a schematic view of the vertical sound protection plates.
  • [ Fig. 4 ] is a schematic view of the connection of two acoustic protection plates according to a first embodiment.
  • [ Fig. 5 ] is a schematic view of the connection of two acoustic protection plates according to the first embodiment.
  • [ Fig. 6 ] is a schematic view of the connection of two acoustic protection plates according to a second embodiment
  • [ Fig. 6 ] is a schematic view of the connection of two acoustic protection plates according to the second embodiment.
  • [ Fig. 7 ] is a schematic view of the lower sound protection plate attached to a vertical wall.
  • [ Fig. 8 ] is a schematic view of the bottom sound protection plate.

Description détaillée des figuresDetailed description of figures

Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the following description, identical reference numerals designate identical parts or parts having similar functions.

Les termes longitudinal, vertical sont par rapport à un référentiel orthonormé dont le plan horizontal peut être parallèle au plan de jonction horizontal entre différents éléments du moteur dont un carter-cylindres et une culasse.The terms longitudinal, vertical are relative to an orthonormal frame of reference, the horizontal plane of which may be parallel to the horizontal junction plane between various elements of the engine, including a cylinder block and a cylinder head.

Selon la figure 1, un moteur thermique ou à combustion interne (non représenté) comprend un carter d'huile 50 disposé en dessous d'un carter-cylindre dudit moteur. Le carter d'huile 50 est entouré par un dispositif 100 de protection acoustique comprenant un caisson 10, sur toute la surface inférieure libre du carter d'huile 50 afin de réduire les bruits générés lors du fonctionnement du moteur, vers l'extérieur du véhicule. Le caisson 10 est composé de plusieurs plaques 11 de protection acoustique dont trois plaques verticales 12 et une plaque inférieure 14.According to figure 1 , a thermal or internal combustion engine (not shown) comprises an oil sump 50 arranged below a cylinder block of said engine. the oil sump 50 is surrounded by an acoustic protection device 100 comprising a box 10, over the entire free lower surface of the oil sump 50 in order to reduce the noise generated during the operation of the engine, towards the outside of the vehicle. The box 10 is made up of several acoustic protection plates 11 including three vertical plates 12 and a lower plate 14.

Chacune des trois plaques verticales 12 est conformée pour être plaquée avec un minimum de jeu contre les parois verticales 51 du carter d'huile. Selon la figure 2, la plaque verticale 12 peut comprendre ainsi une protubérance tubulaire 15 dans la continuité d'un passage de vis de fixation selon un axe vertical, du carter d'huile au carter-cylindres afin de remplir des espaces et disposer de zones de contact avec la paroi du carter d'huile pour assurer au mieux la protection acoustique dudit carter.Each of the three vertical plates 12 is shaped to be pressed with a minimum of play against the vertical walls 51 of the oil sump. According to picture 2 , the vertical plate 12 can thus comprise a tubular protuberance 15 in the continuity of a passage for fixing screws along a vertical axis, from the oil sump to the cylinder block in order to fill spaces and have zones of contact with the wall of the oil sump to best ensure the acoustic protection of said sump.

La plaque inférieure 14 est conformée pour recouvrir la paroi inférieure 52 du carter d'huile. Ladite plaque inférieure 14 présente ainsi un orifice traversant 13 destiné à être en vis-à-vis d'un orifice de purge du carter d'huile. Ledit orifice 13 peut être entouré par un enfoncement convexe 16 tourné vers le carter d'huile 50 pour guider l'écoulement d'huile lors de la purge et éviter de salir la plaque inférieure 14 de protection acoustique.Bottom plate 14 is shaped to cover bottom wall 52 of the oil pan. Said lower plate 14 thus has a through hole 13 intended to be opposite an oil sump drain hole. Said orifice 13 may be surrounded by a convex recess 16 facing the oil sump 50 to guide the flow of oil during the purge and to avoid soiling the lower plate 14 for acoustic protection.

Chacune des plaques verticales 12 et la plaque inférieure 14 comportent des orifices17 traversant de fixation destinés à être traversés par des pions de fixation rapide 53. Ces pions sont de manière préférentielle enfoncés dans des trous creusés dans la paroi du carter d'huile 50. Les pions de fixation 53 permettent de faciliter la mise en place des plaques de protection 12,14 acoustique, en plaquant lesdites plaques contre les parois du carter d'huile.Each of the vertical plates 12 and the lower plate 14 comprise fixing through holes 17 intended to be traversed by quick fixing pins 53. These pins are preferably driven into holes dug in the wall of the oil sump 50. The fixing pins 53 facilitate the installation of the acoustic protection plates 12,14, by pressing said plates against the walls of the oil sump.

Selon les figures 3 à 6, chacune des plaques verticales 12 de protection acoustique comporte une première extrémité longitudinale 18 présentant un système d'emboitement 20 avec une deuxième extrémité longitudinale 19 d'une plaque voisine juxtaposée.According to figures 3 to 6 , each of the vertical plates 12 for acoustic protection has a first longitudinal end 18 having an interlocking system 20 with a second longitudinal end 19 of a juxtaposed neighboring plate.

La première extrémité d'une plaque recouvre ainsi la tranche 32 ou l'épaisseur de l'extrémité de la plaque voisine juxtaposée.The first end of a plate thus covers the edge 32 or the thickness of the end of the juxtaposed neighboring plate.

Selon un mode de réalisation préféré représenté dans les figures 3 et 4, la première extrémité 18 de la plaque présente une boursoufflure 21 en forme de crochet 25. Dans ce mode de réalisation, ledit crochet présente un profil en forme de trapèze tel un tenon 22 et la plaque voisine comporte une cavité 23 à son extrémité longitudinale 19 en vis-à-vis, ici une rainure en forme de mortaise 24. La mortaise 24 est adaptée pour accueillir et loger le tenon 22. Le tenon 22 et la mortaise 24 sont de forme complémentaire. Le tenon 22 s'étend depuis la tranche 32 de l'extrémité 18 de la plaque de protection 12. Le système d'emboitement 20 permet un assemblage simple bien connu en queue d'aronde des deux plaques voisines notamment des plaques verticales 12. Le système d'emboitement permet la fixation en angle et le maintien des extrémités 18,19 des deux plaques voisines et juxtaposées. L'assemblage est ensuite démontable sans effort.According to a preferred embodiment shown in the figures 3 and 4 , the first end 18 of the plate has a blister 21 in the form of a hook 25. In this embodiment, said hook has a profile in the shape of a trapezoid like a tenon 22 and the adjacent plate has a cavity 23 at its longitudinal end 19 opposite, here a groove in the form of a mortise 24. The mortise 24 is adapted to accommodate and house the tenon 22. The tenon 22 and the mortise 24 are of complementary shape. The tenon 22 extends from the edge 32 of the end 18 of the protection plate 12. The interlocking system 20 allows a simple, well-known dovetail assembly of the two neighboring plates, in particular the vertical plates 12. The interlocking system allows the fixing at an angle and the maintenance of the ends 18,19 of the two adjacent and juxtaposed plates. The assembly can then be disassembled effortlessly.

Selon un deuxième mode de réalisation selon les figures 5 et 6, la première extrémité 18 de la plaque verticale 12 comporte une boursoufflure 21 en forme de crochet 25 présentant une courbure ; ledit crochet s'étend sensiblement le long de la tranche de l'extrémité 18 de la plaque verticale 12. La plaque voisine comporte une cavité 23 en vis-à-vis de ladite boursoufflure adaptée pour accueillir ledit crochet et permettre l'accrochage et le blocage dudit crochet 25. Ainsi, la cavité 23 s'étend de manière préférentielle parallèlement à la tranche verticale de l'extrémité 19 de la plaque voisine. Le système d'emboitement 20 permet la fixation en angle et le maintien des extrémités 18,19 des deux plaques voisines et juxtaposées notamment des plaques verticales 12 du caisson de protection acoustique 10. L'assemblage est ensuite démontable sans effort.According to a second embodiment according to the figures 5 and 6 , the first end 18 of the vertical plate 12 comprises a blister 21 in the form of a hook 25 having a curvature; said hook extends substantially along the edge of the end 18 of the vertical plate 12. The neighboring plate has a cavity 23 facing said blister adapted to accommodate said hook and allow the hooking and the blocking of said hook 25. Thus, the cavity 23 preferably extends parallel to the vertical edge of the end 19 of the neighboring plate. The interlocking system 20 allows the fixing at an angle and the maintenance of the ends 18,19 of the two adjacent and juxtaposed plates, in particular the vertical plates 12 of the acoustic protection box 10. The assembly can then be disassembled without effort.

La plaque inférieure 14 comporte une partie sensiblement horizontale 27 et plane prolongée par des parois sensiblement verticales 28. Lesdites parois verticales 28 comportent à l'extrémité un trottoir d'accueil 29 adapté pour recevoir la tranche ou l'épaisseur des plaques verticales12. Ladite plaque inférieure 14 comporte une boursoufflure verticale 21' qui s'étend sensiblement depuis le trottoir d'accueil 29 en direction des plaques verticales 12. Le trottoir d'accueil 29 représente la tranche 32 de l'extrémité de la plaque inférieure 14. Lesdites plaques verticales 12 comportent de leur côté un enfoncement ou cavité de réception 23', ici un creux pour loger la boursoufflure 21' verticale. La boursoufflure verticale 21' et l'enfoncement de réception 23' sont de forme complémentaire. De manière préférentielle, la boursoufflure verticale 21' porte une denture 31 qui entoure toute la boursoufflure 21' autour d'un axe vertical pour améliorer l'accrochage avec les parois verticales, ici dans l'enfoncement 23' de réception. La plaque inférieure 14 peut ainsi être emboitée dans les plaques verticales 12.The lower plate 14 comprises a substantially horizontal and flat part 27 extended by substantially vertical walls 28. Said vertical walls 28 comprise at the end a reception sidewalk 29 adapted to receive the edge or the thickness of the vertical plates 12. Said lower plate 14 comprises a vertical blister 21' which extends substantially from the reception sidewalk 29 in the direction of the vertical plates 12. The reception sidewalk 29 represents the edge 32 of the end of the lower plate 14. Said vertical plates 12 have on their side a recess or receiving cavity 23', here a hollow to house the vertical blister 21'. The vertical blister 21' and the receiving depression 23' are of complementary form. Preferably, the vertical blister 21' carries a toothing 31 which surrounds the entire blister 21' around a vertical axis to improve the attachment with the vertical walls, here in the recess 23' for reception. The lower plate 14 can thus be fitted into the vertical plates 12.

De manière avantageuse, la boursoufflure 21, 21' est issue de matière avec la plaque de protection 12,14 acoustique par moulage. L'obtention de la plaque avec la boursoufflure 21,21' est aisée.Advantageously, the blister 21, 21' is made in one piece with the acoustic protection plate 12,14 by molding. Obtaining the plate with the blister 21,21' is easy.

De manière avantageuse, la plaque de protection est de matière d'isolant acoustique pour faciliter son obtention.Advantageously, the protection plate is made of acoustic insulation material to facilitate its obtaining.

Les plaques verticales peuvent être fixées entre elles grâce au système d'emboitement. Puis on viendra fixer la plaque inférieure avec les plaques verticales en enfonçant les boursoufflures verticales dans les cavités 23,23' de réception. Lesdites plaques verticales12 et inférieure 14 assemblées ensemble forment un caisson 14 de protection acoustique sensiblement rigide grâce au système d'emboitement 20 d'une plaque 12,14 dans la plaque voisine juxtaposée. L'assemblage est cependant aisément démontable.The vertical plates can be fixed together thanks to the interlocking system. Then we will fix the lower plate with the vertical plates by pushing the vertical blisters into the cavities 23,23' for reception. Said vertical 12 and lower 14 plates assembled together form a box 14 for substantially rigid acoustic protection thanks to the interlocking system 20 of a plate 12,14 in the juxtaposed neighboring plate. The assembly is however easily removable.

Le caisson 10 est fixé au carter d'huile en enfonçant les pions de fixation 53 au travers des orifices de fixation 17 des plaques de protection acoustiques 12,14 dans les trous prévus dans le carter d'huile. Le caisson 10 est alors fixé contre le carter d'huile avec une continuité des parois pour optimiser l'isolation acoustique.The box 10 is fixed to the oil sump by pushing the fixing pins 53 through the fixing holes 17 of the acoustic protection plates 12,14 into the holes provided in the oil sump. The box 10 is then fixed against the oil sump with a continuity of the walls to optimize the acoustic insulation.

L'objectif est atteint: le dispositif de protection acoustique 10 permet un recouvrement du carter d'huile avec un recouvrement des parois de protection pour assurer une protection acoustique optimale grâce au caisson de protection acoustique adapté pour recouvrir les parois libres du carter d'huile. De manière avantageuse, le système d'emboitement du dispositif permet de faciliter d'une part la fabrication de chacune des plaques formant le caisson et leur mise en place et d'autre part le démontage du caisson pour avoir accès au carter d'huile lors de réparations.The objective is achieved: the acoustic protection device 10 allows a covering of the oil sump with a covering of the protective walls to ensure optimum acoustic protection thanks to the acoustic protection box adapted to cover the free walls of the oil sump . Advantageously, the interlocking system of the device facilitates on the one hand the manufacture of each of the plates forming the casing and their installation and on the other hand the dismantling of the casing to have access to the oil sump during of repairs.

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de cette prise, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes, dans le cadre des revendications ci-après.It goes without saying that the invention is not limited solely to the embodiments of this socket, described above by way of examples, on the contrary it embraces all the variants thereof, within the framework of the claims below. .

Par exemple, l'obtention des plaques de protection acoustique peut faire appel à des techniques d'impression tridimensionnelle.For example, the obtaining of acoustic protection plates can call upon three-dimensional printing techniques.

Le système d'emboitement peut comprendre d'autres différents moyens. Par exemple, la boursoufflure peut comprendre une tige avec un moyen d'arrêt à son extrémité tel qu'une boule pour être enfoncé dans l'orifice d'accueil de la plaque voisine juxtaposée.The interlocking system can include other different means. For example, the blister can comprise a rod with a stopper at its end such as a ball to be pushed into the reception hole of the adjacent juxtaposed plate.

Claims (9)

  1. Acoustic protection device (100) for a motor vehicle engine crankcase (50)
    characterized in that said device comprises a casing (10) made up of acoustic protection panels (12, 14) covering said crankcase, each of the panels comprising a first longitudinal end (18) having a system (20) for reversible interfitting in a second longitudinal end (19) of the juxtaposed adjacent panel, said interfitting system comprising a bulge (21, 21') comprising a hook (25), in the first longitudinal end (18) of the panel, and which is pushed into a cavity (23) sunk in the second end (19) of the juxtaposed adjacent panel.
  2. Protection device (100) according to Claim 1, characterized in that the bulge (21, 21') extends from an edge face (32) of the first longitudinal end (18) of the panel (12, 14).
  3. Protection device (100) according to Claim 1 or 2, characterized in that the bulge (21, 21') and the cavity (23) have complementing shapes.
  4. Protection device (100) according to any one of Claims 1 to 3, characterized in that the hook (25) has a curvature.
  5. Protection device (100) according to any one of Claims 1 to 3, characterized in that the hook (25) bears a set of teeth (31) surrounding the bulge.
  6. Protection device (100) according to any one of Claims 1 to 3, characterized in that the hook (25) has a trapezoidal profile.
  7. Protection device (100) according to any one of Claims 1 to 6, characterized in that the bulge (21) is formed integrally with the panel (12, 14).
  8. Protection device (100) according to any one of Claims 1 to 7, characterized in that each of the panels (12, 14) comprises at least one through-orifice intended to have a quick-fix means (53) for fixing to the wall of the crankcase (50) pass through it.
  9. Protection device (100) according to any one of Claims 1 to 8, characterized in that the panel (12, 14) is moulded in acoustic insulation material.
EP19196502.9A 2018-09-11 2019-09-10 Acoustic protection device for a motor vehicle engine Active EP3623599B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1871020A FR3085642B1 (en) 2018-09-11 2018-09-11 ACOUSTIC PROTECTION DEVICE FOR MOTOR VEHICLE ENGINE

Publications (2)

Publication Number Publication Date
EP3623599A1 EP3623599A1 (en) 2020-03-18
EP3623599B1 true EP3623599B1 (en) 2022-07-20

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EP19196502.9A Active EP3623599B1 (en) 2018-09-11 2019-09-10 Acoustic protection device for a motor vehicle engine

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EP (1) EP3623599B1 (en)
FR (1) FR3085642B1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2827337B1 (en) * 2001-07-13 2005-01-14 Benien Produktionstechnik Gmbh ACCOUSTIC COATING FOR AT LEAST ONE PART OF A COMBUSTION ENGINE, IN PARTICULAR AN ENGINE OIL PAN

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT308475B (en) * 1969-09-08 1973-07-10 List Hans Soundproof casing for internal combustion engines
DE3425074A1 (en) * 1984-07-07 1986-01-16 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München SOUND INSULATED OIL PAN FOR A TRUCK COMBUSTION ENGINE
US5452693A (en) * 1994-12-09 1995-09-26 Cummins Engine Company, Inc. Oil pan noise enclosure and attachment system for same
JPH08218889A (en) * 1995-02-09 1996-08-27 Mitsubishi Motors Corp Noise insulation cover for engine
FR2982559B1 (en) 2011-11-14 2014-01-10 Cera THIN-PROTECTIVE DEVICE FOR ACOUSTIC PROTECTION TO BE PROVIDED AGAINST AN ELECTRIC MOTOR HOUSING WALL FOR A MOTOR VEHICLE
CN105421826B (en) 2015-12-08 2018-11-27 太空智造股份有限公司 A kind of assembled integral vacuum toilet and its method of construction

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2827337B1 (en) * 2001-07-13 2005-01-14 Benien Produktionstechnik Gmbh ACCOUSTIC COATING FOR AT LEAST ONE PART OF A COMBUSTION ENGINE, IN PARTICULAR AN ENGINE OIL PAN

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Publication number Publication date
FR3085642A1 (en) 2020-03-13
FR3085642B1 (en) 2022-06-24
EP3623599A1 (en) 2020-03-18

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