EP1640589A1 - Engine's front cover and assembly of engine and front cover - Google Patents

Engine's front cover and assembly of engine and front cover Download PDF

Info

Publication number
EP1640589A1
EP1640589A1 EP05291717A EP05291717A EP1640589A1 EP 1640589 A1 EP1640589 A1 EP 1640589A1 EP 05291717 A EP05291717 A EP 05291717A EP 05291717 A EP05291717 A EP 05291717A EP 1640589 A1 EP1640589 A1 EP 1640589A1
Authority
EP
European Patent Office
Prior art keywords
casing
areas
facade
engine
distribution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05291717A
Other languages
German (de)
French (fr)
Inventor
Zoran Dimitrijevic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1640589A1 publication Critical patent/EP1640589A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00Component parts, details or accessories, not otherwise provided for
    • F02B77/11Thermal or acoustic insulation
    • F02B77/13Acoustic insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00Casings, e.g. crankcases or frames
    • F02F7/006Camshaft or pushrod housings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00Casings, e.g. crankcases or frames
    • F02F7/0065Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/0073Adaptations for fitting the engine, e.g. front-plates or bell-housings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00Casings, e.g. crankcases or frames
    • F02F7/0065Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/008Sound insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05CINDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00Other material characteristics; Treatment of material
    • F05C2253/16Fibres

Definitions

  • the invention relates to the automotive industry, and more particularly to the attenuation of noise emitted by internal combustion engines.
  • the distribution facade At one end of an engine is what is called the distribution facade. It is essentially the pulleys carried by the ends of the crankshaft and the camshaft (or shafts), and the timing belt which transmits to the camshaft the rotation of the crankshaft.
  • the dispensing facade may also include other pulleys on which the timing belt acts, for example to ensure the drive of the water pump. It also has rollers by which the tension and the orientation of the strands of the timing belt are adjusted.
  • crankcase isolates the distribution façade from the outside environment, in order to protect it from shocks and projections of water or oil. This housing must be able to withstand temperatures of 80 to 130 ° C.
  • distribution facade casings are often made of plastic, for example polyamide PA6. But they have the disadvantage of poorly absorb, or even amplify the noise emitted by the facade in the range 100-500Hz. This is due in part to the leakage present in the housing assembly, due to the tolerance intervals of the distribution facade. This can be remedied by sealing these leaks with gaskets, but it is an expensive solution. On the other hand, it establishes resonance phenomena between the cavity defined by the housing and the structure on which it is mounted. It can be remedied by stiffening the housing, and putting in place a support lug of the housing on the engine, which breaks the radiating mode. But again this solution is expensive.
  • the casing of the distribution facade has also been proposed to make the casing of the distribution facade in three parts.
  • the upper part is made of plastic, covered with foam on its engine support surface, and strongly alveolate on its internal face. Decoupling spacers are also provided at the fixing screws.
  • the two lower parts of the housing are made of steel so that tolerances and adjustments are well managed.
  • a portion of the housing is specifically dedicated to the insulation of the crankshaft pulley.
  • the internal faces of the various elements of the casing are covered with velvet to improve the absorption of sounds. Acoustically, this solution is effective, but it has the disadvantage of leading to a high weight of the timing case.
  • the object of the invention is to propose a new configuration for an engine fire distribution front casing, which provides good acoustic insulation of the facade while being inexpensive to manufacture and install.
  • the subject of the invention is a distribution front casing of an internal combustion engine, characterized in that it is made of a thermocompressed textile felt complex, in that it presents, on the one hand, thicker and lower density areas facing the main sources of acoustic emissions from the engine's distribution facade and, on the other hand, areas of smaller thickness and higher density.
  • its periphery is included in said areas of smaller thickness and higher density.
  • This housing can be made in several parts, the peripheral zones are preferably each included in said areas of smaller thickness and higher density.
  • At least its thicker and lower density areas may be covered with sound absorbing material.
  • the invention also relates to an assembly formed by an internal combustion engine and its distribution front casing, characterized in that said casing is of the preceding type.
  • Said areas of greater thickness and lower density of the housing are preferably located in the vicinity of at least one of the following elements: the crankshaft pulley and the longest strand of the timing belt.
  • the invention consists in producing the casing of the distribution facade in a thermocompressed textile felt complex, and in conferring on this casing, in the zones where the absorption of the low frequencies is the most necessary, thickness and compression characteristics that are particularly suitable for this absorption.
  • the casing is given a lower thickness and greater density, thus greater rigidity, which reduces acoustic leakage at the mounting areas.
  • the casing of the distribution facade is in place.
  • it consists of two parts: an upper part 10 which covers the pulleys 4, 5 and the roller 8 and a lower part 11 which covers the pulley 2 and the rollers 8, 9, and has a perforation 12 leaving the passage to the pulley 2 of the crankshaft.
  • This is only an example of configuration, and it could, in particular, consider that this housing has a single portion covering the entire facade 1, or more than two parts.
  • the two parts 10, 11 of the casing are made of a thermocompressed textile felt complex, namely an amalgam based on textile fibers comparable to those already used for the acoustic insulation of different parts of the vehicles such as engine hoods.
  • the thickness and rigidity of the material are variable depending on the areas of the portions 10, 11 of the casing concerned.
  • the areas of the parts 10, 11 of the casing which are intended to be placed facing the main noise-emitting sources have the highest thickness (of the order of 3 to 5 mm for example) and the density the lowest (of the order of 1000g / m 2 for example), obtained by a relatively low compression of the corresponding areas during the manufacture of parts 10, 11. These areas are hatched in Figure 2. These are essentially the neighborhoods the crankshaft pulley 2 and the longest strand of the timing belt 7. These characteristics are well suited to the absorption of low frequencies (100-500Hz) and the prevention of their amplification by resonance phenomena.
  • the remainder of the parts 10, 11 has a smaller thickness (of the order of 2 mm for example) and a higher density (of the order of 1200 g / m 2 for example), obtained by a relatively strong compression of corresponding areas during the manufacture of the parts 10, 11.
  • the peripheral zones of the parts 10, 11 are preferably made as well. In this way, at the periphery of the parts 10, 11 of the casing is obtained rigidity and precision in the dimensions which ensure good contact between the parts 10, 11 of the housing and the motor 1 on which they are mounted. It eliminates the best acoustic leaks.
  • FIG. 3 shows the acoustic absorption curve 13 of a PA6 polyamide reference distribution front casing, and the sound absorption curve 14 of a thermocompressed felt complex casing of the same geometry, and having, according to the invention thermocompression states modulated according to the different zones of the housing according to their situation by in relation to the main sources of noise emissions from the engine distribution panel 1.
  • the reference casing has between 100 and 500 Hz two resonant frequencies, while the absorption curve of the casing according to the invention is almost flat in the low frequencies between 100 and 400 Hz, and attests to continuously increasing absorption properties. above 400Hz. In the higher frequencies, between 600 and 3000Hz approximately, the absorbing properties of the two casings are very comparable.
  • the invention it is therefore possible to eliminate the amplification phenomena of the low frequencies (100-500Hz) due to the resonances observed with the polyamide distribution front casings, while maintaining a very good prevention of acoustic leaks and a adequate absorption of higher frequencies (500-3000Hz).
  • thermocompressed textile felt allows to divide by three the mass of the housing for a cost price that remains competitive.

Abstract

The cover has an upper part (10) covering pulleys and a tension roller, and a lower part (11) covering a crankshaft pulley and a set of tension rollers and including a perforation (12) to pass the crankshaft pulley. The two parts are formed of thermo-compressed textile felt composite and have high thickness and low density zones and low thickness and high density zones, where the cover is made of polyamide PA6. An independent claim is also included for a spark ignition engine and a front timing cover assembly.

Description

L'invention concerne l'industrie automobile, et, plus particulièrement, l'atténuation des bruits émis par les moteurs à explosion.The invention relates to the automotive industry, and more particularly to the attenuation of noise emitted by internal combustion engines.

A une extrémité d'un moteur à explosion se trouve ce que l'on appelle la façade de distribution. Il s'agit essentiellement des poulies portées par les extrémités du vilebrequin et de l'arbre (ou des arbres) à cames, et de la courroie de distribution qui transmet à l'arbre à cames la rotation du vilebrequin. La façade de distribution peut inclure également d'autres poulies sur lesquelles agit la courroie de distribution, par exemple pour assurer l'entraînement de la pompe à eau. Elle comporte également des galets grâce auxquels la tension et l'orientation des brins de la courroie de distribution sont réglés.At one end of an engine is what is called the distribution facade. It is essentially the pulleys carried by the ends of the crankshaft and the camshaft (or shafts), and the timing belt which transmits to the camshaft the rotation of the crankshaft. The dispensing facade may also include other pulleys on which the timing belt acts, for example to ensure the drive of the water pump. It also has rollers by which the tension and the orientation of the strands of the timing belt are adjusted.

Un carter isole la façade de distribution du milieu extérieur, afin de la protéger des chocs et des projections d'eau ou d'huile. Ce carter doit pouvoir résister à des températures de 80 à 130°C.A crankcase isolates the distribution façade from the outside environment, in order to protect it from shocks and projections of water or oil. This housing must be able to withstand temperatures of 80 to 130 ° C.

Actuellement, les carters de façade de distribution sont souvent réalisés en plastique, par exemple en polyamide PA6. Mais ils ont l'inconvénient de mal absorber, voire même d'amplifier les bruits émis par la façade dans la gamme 100-500Hz. Cela est dû en partie aux fuites présentes dans le montage du carter, à cause des intervalles de tolérances de la façade de distribution. On peut y remédier en colmatant ces fuites par des joints d'étanchéité, mais c'est une solution coûteuse. D'autre part, il s'établit des phénomènes de résonance entre la cavité définie par le carter et la structure sur laquelle il est monté. On peut y remédier en raidissant le carter, et en mettant en place une patte d'appui du carter sur le moteur, qui casse le mode rayonnant. Mais là encore cette solution s'avère coûteuse.Currently, distribution facade casings are often made of plastic, for example polyamide PA6. But they have the disadvantage of poorly absorb, or even amplify the noise emitted by the facade in the range 100-500Hz. This is due in part to the leakage present in the housing assembly, due to the tolerance intervals of the distribution facade. This can be remedied by sealing these leaks with gaskets, but it is an expensive solution. On the other hand, it establishes resonance phenomena between the cavity defined by the housing and the structure on which it is mounted. It can be remedied by stiffening the housing, and putting in place a support lug of the housing on the engine, which breaks the radiating mode. But again this solution is expensive.

On a également proposé de réaliser le carter de la façade de distribution en trois parties. La partie supérieure est en plastique, recouverte de mousse sur sa face d'appui moteur, et fortement alvéolée sur sa face interne. Des entretoises de découplage sont également prévues au niveau des vis de fixation. Les deux parties inférieures du carter sont en acier, de manière à bien gérer les tolérances et les ajustements. En particulier, une partie du carter est spécifiquement dédiée à l'isolation de la poulie du vilebrequin. Les faces internes des différents éléments du carter sont recouvertes de velours pour améliorer l'absorption des sons. Sur le plan acoustique, cette solution est efficace, mais elle a l'inconvénient de conduire à un poids élevé du carter de distribution.It has also been proposed to make the casing of the distribution facade in three parts. The upper part is made of plastic, covered with foam on its engine support surface, and strongly alveolate on its internal face. Decoupling spacers are also provided at the fixing screws. The two lower parts of the housing are made of steel so that tolerances and adjustments are well managed. In particular, a portion of the housing is specifically dedicated to the insulation of the crankshaft pulley. The internal faces of the various elements of the casing are covered with velvet to improve the absorption of sounds. Acoustically, this solution is effective, but it has the disadvantage of leading to a high weight of the timing case.

Le but de l'invention est de proposer une nouvelle configuration pour un carter de façade de distribution de moteur à explosion, qui procure une bonne isolation acoustique de la façade tout en étant peu coûteux à fabriquer et à installer.The object of the invention is to propose a new configuration for an engine fire distribution front casing, which provides good acoustic insulation of the facade while being inexpensive to manufacture and install.

A cet effet, l'invention a pour objet un carter de façade de distribution d'un moteur à explosion, caractérisé en ce qu'il est réalisé en un complexe de feutre textile thermocompressé, en ce qu'il présente d'une part des zones de plus forte épaisseur et de plus faible densité situées face aux principales sources d'émissions acoustiques de la façade de distribution du moteur et, d'autre part, des zones de plus faible épaisseur et de plus forte densité.For this purpose, the subject of the invention is a distribution front casing of an internal combustion engine, characterized in that it is made of a thermocompressed textile felt complex, in that it presents, on the one hand, thicker and lower density areas facing the main sources of acoustic emissions from the engine's distribution facade and, on the other hand, areas of smaller thickness and higher density.

De préférence, sa périphérie est incluse dans lesdites zones de plus faible épaisseur et de plus forte densité.Preferably, its periphery is included in said areas of smaller thickness and higher density.

Ce carter peut être réalisé en plusieurs parties, dont les zones périphériques sont de préférence chacune incluses dans lesdites zones de plus faible épaisseur et de plus forte densité.This housing can be made in several parts, the peripheral zones are preferably each included in said areas of smaller thickness and higher density.

Au moins ses zones de plus forte épaisseur et de plus faible densité peuvent être recouvertes d'un matériau absorbant les sons.At least its thicker and lower density areas may be covered with sound absorbing material.

L'invention a également pour objet un ensemble formé par un moteur à explosion et son carter de façade de distribution, caractérisé en ce que ledit carter est du type précédent.The invention also relates to an assembly formed by an internal combustion engine and its distribution front casing, characterized in that said casing is of the preceding type.

Lesdites zones de plus forte épaisseur et de plus faible densité du carter sont de préférence situées au voisinage d'au moins l'un des éléments suivants : la poulie du vilebrequin et le brin le plus long de la courroie de distribution.Said areas of greater thickness and lower density of the housing are preferably located in the vicinity of at least one of the following elements: the crankshaft pulley and the longest strand of the timing belt.

Comme on l'aura compris, l'invention consiste à réaliser le carter de la façade de distribution en un complexe de feutre textile thermocompressé, et à conférer à ce carter, dans les zones où l'absorption des basses fréquences est la plus nécessaire, des caractéristiques d'épaisseur et de compression qui se prêtent particulièrement à cette absorption. Dans les autres zones du carter, notamment, de préférence, à sa périphérie, on confère au carter une plus faible épaisseur et une plus grande densité, donc une plus grande rigidité, ce qui permet de réduire les fuites acoustiques au niveau des zones de montage.As will be understood, the invention consists in producing the casing of the distribution facade in a thermocompressed textile felt complex, and in conferring on this casing, in the zones where the absorption of the low frequencies is the most necessary, thickness and compression characteristics that are particularly suitable for this absorption. In the other areas of the housing, particularly preferably at its periphery, the casing is given a lower thickness and greater density, thus greater rigidity, which reduces acoustic leakage at the mounting areas.

L'invention sera mieux comprise à la lecture de la description qui suit, donnée en référence aux figures annexées suivantes :

  • la figure 1 qui montre schématiquement vue de face une façade de distribution de moteur à explosion à deux arbres à cames ;
  • la figure 2 qui montre schématiquement cette même façade revêtue d'un exemple de carter de façade de distribution selon l'invention ;
  • la figure 3 qui montre les courbes d'absorption acoustique de deux carters de façade de même géométrie, l'une de conception classique, l'autre conçu selon l'invention.
The invention will be better understood on reading the description which follows, given with reference to the following appended figures:
  • Figure 1 which schematically shows a front view of a distribution distribution engine with two camshaft explosion;
  • Figure 2 which shows schematically this same facade coated with an example of distributing facade casing according to the invention;
  • Figure 3 shows the sound absorption curves of two facade casings of the same geometry, one of conventional design, the other designed according to the invention.

Sur la figure 1, on a représenté schématiquement l'extrémité d'un moteur à explosion 1. Celle-ci comporte notamment :

  • une poulie 2 fixée à l'extrémité du vilebrequin, non visible sur la figure 1 car il est masqué par le volant moteur 3 fixé au vilebrequin ;
  • deux poulies 4, 5 fixées chacune à l'extrémité d'un des arbres à cames du moteur 1 ;
  • une poulie 6 solidaire du rotor de la pompe à eau du moteur 1 (non représentée) ;
  • une courroie de distribution crantée 7 enroulée autour desdites poulies 2, 4, 5, 6 qui est entraînée par la rotation du vilebrequin grâce à la poulie 2, et qui assure ainsi l'entraînement des arbres à cames et de la pompe à eau (et, le cas échéant, de tout autre organe non représenté) ;
  • un galet tendeur dynamique 8 qui permet de régler la tension de la courroie 7 ;
  • et un galet enrouleur 9 qui contribue à une bonne orientation de la courroie 7 à son attaque de la poulie 2 du vilebrequin.
FIG. 1 diagrammatically shows the end of a combustion engine 1.
  • a pulley 2 attached to the end of the crankshaft, not visible in Figure 1 because it is hidden by the flywheel 3 fixed to the crankshaft;
  • two pulleys 4, 5 each fixed to the end of one of the camshafts of the engine 1;
  • a pulley 6 integral with the rotor of the water pump of the engine 1 (not shown);
  • a timing belt 7 wound around said pulleys 2, 4, 5, 6 which is driven by the rotation of the crankshaft by the pulley 2, and which thus ensures the driving of the camshafts and the water pump (and , if any, of any other organ not shown);
  • a dynamic tensioning roller 8 which makes it possible to adjust the tension of the belt 7;
  • and a winding roller 9 which contributes to a good orientation of the belt 7 to its attack of the pulley 2 of the crankshaft.

Sur la figure 2, le carter de la façade de distribution est en place. Dans l'exemple représenté, il se compose de deux parties : une partie supérieure 10 qui recouvre les poulies 4, 5 et le galet 8 et une partie inférieure 11 qui recouvre la poulie 2 et les galets 8, 9, et possède une perforation 12 laissant le passage à la poulie 2 du vilebrequin. Ceci ne constitue qu'un exemple de configuration, et on pourrait, notamment, envisager que ce carter comporte une seule partie couvrant la totalité de la façade 1, ou plus de deux parties.In Figure 2, the casing of the distribution facade is in place. In the example shown, it consists of two parts: an upper part 10 which covers the pulleys 4, 5 and the roller 8 and a lower part 11 which covers the pulley 2 and the rollers 8, 9, and has a perforation 12 leaving the passage to the pulley 2 of the crankshaft. This is only an example of configuration, and it could, in particular, consider that this housing has a single portion covering the entire facade 1, or more than two parts.

Selon l'invention, les deux parties 10, 11 du carter sont réalisées en un complexe de feutre textile thermocompressé, à savoir un amalgame à base de fibres textiles comparable à ceux que l'on utilise déjà pour l'isolation acoustique de différentes parties des véhicules telles que les capots moteur. De plus, l'épaisseur et la rigidité du matériau sont variables selon les zones des parties 10, 11 du carter concernées.According to the invention, the two parts 10, 11 of the casing are made of a thermocompressed textile felt complex, namely an amalgam based on textile fibers comparable to those already used for the acoustic insulation of different parts of the vehicles such as engine hoods. In addition, the thickness and rigidity of the material are variable depending on the areas of the portions 10, 11 of the casing concerned.

Selon l'invention, les zones des parties 10, 11 du carter qui sont destinées à être placées en regard des principales sources émettrices de bruit ont l'épaisseur la plus forte (de l'ordre de 3 à 5mm par exemple) et la densité la plus faible (de l'ordre de 1000g/m2 par exemple), obtenues par une compression relativement faible des zones correspondantes lors de la fabrication des parties 10, 11. Ces zones sont hachurées sur la figure 2. Ce sont essentiellement les voisinages de la poulie du vilebrequin 2 et du brin le plus long de la courroie de distribution 7. Ces caractéristiques sont bien adaptées à l'absorption des basses fréquences (100-500Hz) et à la prévention de leur amplification par des phénomènes de résonance.According to the invention, the areas of the parts 10, 11 of the casing which are intended to be placed facing the main noise-emitting sources have the highest thickness (of the order of 3 to 5 mm for example) and the density the lowest (of the order of 1000g / m 2 for example), obtained by a relatively low compression of the corresponding areas during the manufacture of parts 10, 11. These areas are hatched in Figure 2. These are essentially the neighborhoods the crankshaft pulley 2 and the longest strand of the timing belt 7. These characteristics are well suited to the absorption of low frequencies (100-500Hz) and the prevention of their amplification by resonance phenomena.

En revanche, le restant des parties 10, 11 a une épaisseur moindre (de l'ordre de 2mm par exemple) et une densité plus forte (de l'ordre de 1200g/m2 par exemple), obtenues par une relativement forte compression des zones correspondantes lors de la fabrication des parties 10, 11. En particulier, les zones périphériques des parties 10, 11 sont, de préférence, réalisées ainsi. De cette façon, on obtient à la périphérie des parties 10, 11 du carter une rigidité et une précision dans les dimensions qui garantissent un bon contact entre les parties 10, 11 du carter et le moteur 1 sur lequel elles sont montées. On élimine ainsi au mieux les fuites acoustiques.On the other hand, the remainder of the parts 10, 11 has a smaller thickness (of the order of 2 mm for example) and a higher density (of the order of 1200 g / m 2 for example), obtained by a relatively strong compression of corresponding areas during the manufacture of the parts 10, 11. In particular, the peripheral zones of the parts 10, 11 are preferably made as well. In this way, at the periphery of the parts 10, 11 of the casing is obtained rigidity and precision in the dimensions which ensure good contact between the parts 10, 11 of the housing and the motor 1 on which they are mounted. It eliminates the best acoustic leaks.

La figure 3 montre la courbe d'absorption acoustique 13 d'un carter de façade de distribution de référence en polyamide PA6, et la courbe d'absorption acoustique 14 d'un carter en complexe de feutre thermocompressé de même géométrie, et présentant, selon l'invention, des états de thermocompression modulés selon les différentes zones du carter en fonction de leur situation par rapport aux principales sources d'émissions sonores de la façade de distribution du moteur 1.FIG. 3 shows the acoustic absorption curve 13 of a PA6 polyamide reference distribution front casing, and the sound absorption curve 14 of a thermocompressed felt complex casing of the same geometry, and having, according to the invention thermocompression states modulated according to the different zones of the housing according to their situation by in relation to the main sources of noise emissions from the engine distribution panel 1.

Le carter de référence présente entre 100 et 500Hz deux fréquences de résonance importante, alors que la courbe d'absorption du carter selon l'invention est quasiment plate dans les basses fréquences entre 100 et 400Hz, et atteste de propriétés d'absorption augmentant continûment au-delà de 400Hz. Dans les fréquences plus hautes, entre 600 et 3000Hz environ, les propriétés absorbantes des deux carters sont très comparables.The reference casing has between 100 and 500 Hz two resonant frequencies, while the absorption curve of the casing according to the invention is almost flat in the low frequencies between 100 and 400 Hz, and attests to continuously increasing absorption properties. above 400Hz. In the higher frequencies, between 600 and 3000Hz approximately, the absorbing properties of the two casings are very comparable.

Grâce à l'invention, on peut donc éliminer les phénomènes d'amplification des basses fréquences (100-500Hz) dus aux résonances, constatés avec les carters de façade de distribution en polyamide, tout en conservant une très bonne prévention des fuites acoustiques et une absorption adéquate des fréquences plus élevées (500-3000Hz).Thanks to the invention, it is therefore possible to eliminate the amplification phenomena of the low frequencies (100-500Hz) due to the resonances observed with the polyamide distribution front casings, while maintaining a very good prevention of acoustic leaks and a adequate absorption of higher frequencies (500-3000Hz).

De plus, par rapport à un polyamide, le feutre textile thermocompressé permet de diviser par trois la masse du carter pour un prix de revient qui demeure compétitif.In addition, compared to a polyamide, the thermocompressed textile felt allows to divide by three the mass of the housing for a cost price that remains competitive.

Il demeurerait dans l'esprit de l'invention de compléter le carter de façade de distribution en revêtant au moins certaines de ses zones par un matériau absorbant les sons tel qu'un nouveau morceau de feutre peu compressé, à condition qu'il ne compromette pas les capacités de prévention des fuites acoustiques.It would remain in the spirit of the invention to complete the distribution facade casing by coating at least some of its areas with a sound-absorbing material such as a new piece of low-compression felt, provided that it does not compromise. not the ability to prevent acoustic leakage.

Claims (7)

Carter de façade de distribution d'un moteur à explosion (1), caractérisé en ce qu'il est réalisé en un complexe de feutre textile thermocompressé, en ce qu'il présente d'une part des zones de plus forte épaisseur et de plus faible densité situées face aux principales sources d'émissions acoustiques dudit moteur (1) et, d'autre part, des zones de plus faible épaisseur et de plus forte densité.Distributor facade casing of an internal combustion engine (1), characterized in that it is made of a thermocompressed textile felt complex, in that it has, on the one hand, zones of greater thickness and moreover low density facing the main sources of acoustic emissions of said engine (1) and, on the other hand, areas of smaller thickness and higher density. Carter de façade de distribution selon la revendication 1, caractérisé en ce que sa périphérie est incluse dans lesdites zones de plus faible épaisseur et de plus forte densité.Distribution facade casing according to claim 1, characterized in that its periphery is included in said areas of smaller thickness and higher density. Carter de façade de distribution selon la revendication 1 ou 2, caractérisé en ce qu'il est réalisé en plusieurs parties (10, 11).Distribution facade casing according to claim 1 or 2, characterized in that it is made of several parts (10, 11). Carter de façade selon la revendication 3, caractérisé en ce que les zones périphériques desdites parties (10, 11) sont chacune incluses dans lesdites zones de plus faible épaisseur et de plus forte densité.Facade casing according to claim 3, characterized in that the peripheral zones of said parts (10, 11) are each included in said areas of smaller thickness and higher density. Carter de façade de distribution selon l'une des revendications 1 à 4, caractérisé en ce qu'au moins ses zones de plus forte épaisseur et de plus faible densité sont recouvertes d'un matériau absorbant les sons.Distribution facade casing according to one of claims 1 to 4, characterized in that at least its thicker and lower density areas are covered with a sound absorbing material. Ensemble formé par un moteur à explosion (1) et son carter de façade de distribution (10, 11), caractérisé en ce que ledit carter (10, 11) est du type selon l'une des revendications 1 à 5.Assembly formed by an internal combustion engine (1) and its distributing facia casing (10, 11), characterized in that said casing (10, 11) is of the type according to one of Claims 1 to 5. Ensemble selon la revendication 6, caractérisé en ce que lesdites zones de plus forte épaisseur et de plus faible densité du carter (10, 11) sont situées au voisinage d'au moins l'un des éléments suivants : la poulie du vilebrequin (2) et le brin le plus long de la courroie de distribution (7).An assembly according to claim 6, characterized in that said areas of greater thickness and lower density of the housing (10, 11) are located in the vicinity of at least one of the following elements: the pulley of the crankshaft (2) and the longest strand of the timing belt (7).
EP05291717A 2004-09-23 2005-08-11 Engine's front cover and assembly of engine and front cover Withdrawn EP1640589A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0410078A FR2875553B1 (en) 2004-09-23 2004-09-23 EXPLOSION ENGINE DISTRIBUTION FACILITY HOUSING, AND AN ENGINE ASSEMBLY AND CARTER

Publications (1)

Publication Number Publication Date
EP1640589A1 true EP1640589A1 (en) 2006-03-29

Family

ID=34949426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05291717A Withdrawn EP1640589A1 (en) 2004-09-23 2005-08-11 Engine's front cover and assembly of engine and front cover

Country Status (2)

Country Link
EP (1) EP1640589A1 (en)
FR (1) FR2875553B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2485776A (en) * 2010-11-23 2012-05-30 Gm Global Tech Operations Inc Timing device cover comprising two parts
CN108691686A (en) * 2017-04-11 2018-10-23 丰田自动车株式会社 Cylinder head casing
CN108915888A (en) * 2018-07-19 2018-11-30 东风商用车有限公司 A kind of diesel engine rear end housing for timing gear convering system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456092A (en) * 1980-09-22 1984-06-26 Nissan Motor Co., Ltd. Noise-shielding panel for engine
US4480609A (en) * 1980-10-23 1984-11-06 Nissan Motor Company, Limited Front cover of automotive engine
JPS60206940A (en) * 1984-03-30 1985-10-18 Honda Motor Co Ltd Noise-proof cover for internal-combustion engine
US4867335A (en) * 1988-11-30 1989-09-19 Mr. Gasket Company Timing-chain cover cap
JPH08100672A (en) * 1994-09-30 1996-04-16 Mitsubishi Motors Corp Noise preventing cover of engine
EP0765737A1 (en) * 1995-03-13 1997-04-02 Sumitomo Chemical Company, Limited Sound absorbing component
JPH09209774A (en) * 1996-01-30 1997-08-12 Suzuki Motor Corp Chain cover for internal combustion engine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456092A (en) * 1980-09-22 1984-06-26 Nissan Motor Co., Ltd. Noise-shielding panel for engine
US4480609A (en) * 1980-10-23 1984-11-06 Nissan Motor Company, Limited Front cover of automotive engine
JPS60206940A (en) * 1984-03-30 1985-10-18 Honda Motor Co Ltd Noise-proof cover for internal-combustion engine
US4867335A (en) * 1988-11-30 1989-09-19 Mr. Gasket Company Timing-chain cover cap
JPH08100672A (en) * 1994-09-30 1996-04-16 Mitsubishi Motors Corp Noise preventing cover of engine
EP0765737A1 (en) * 1995-03-13 1997-04-02 Sumitomo Chemical Company, Limited Sound absorbing component
JPH09209774A (en) * 1996-01-30 1997-08-12 Suzuki Motor Corp Chain cover for internal combustion engine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 08 30 August 1996 (1996-08-30) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 12 25 December 1997 (1997-12-25) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2485776A (en) * 2010-11-23 2012-05-30 Gm Global Tech Operations Inc Timing device cover comprising two parts
GB2485776B (en) * 2010-11-23 2014-12-10 Gm Global Tech Operations Inc Timing device cover comprising two parts
US9004040B2 (en) 2010-11-23 2015-04-14 GM Global Technology Operations LLC Timing cover assembly for an internal combustion engine
CN108691686A (en) * 2017-04-11 2018-10-23 丰田自动车株式会社 Cylinder head casing
CN108915888A (en) * 2018-07-19 2018-11-30 东风商用车有限公司 A kind of diesel engine rear end housing for timing gear convering system
CN108915888B (en) * 2018-07-19 2023-10-20 东风商用车有限公司 Timing gear chamber cover system at rear end of diesel engine

Also Published As

Publication number Publication date
FR2875553A1 (en) 2006-03-24
FR2875553B1 (en) 2010-07-30

Similar Documents

Publication Publication Date Title
EP0838608B1 (en) Belt tensioning device, drive belt arrangement comprising such a device and internal combustion engine for a vehicle comprising such an arrangement
FR2640714A1 (en) TENSION DEVICE BY TRANSMISSION BY FLEXIBLE LINK WITH DOUBLE ROLLER ON ELASTIC TORSION RING
FR2680851A1 (en) DISQUE - SHAPED COMPONENT, IN PARTICULAR FOR DRIVING SYSTEMS.
EP1640589A1 (en) Engine's front cover and assembly of engine and front cover
KR20180079331A (en) Self-aligning self-aligning bearing on decoupling tensioner
EP2035688B1 (en) Device for deadening the noise and vibrations attributable to the injectors in a vehicle engine
FR2883603A1 (en) DISPENSING CASTER FOR AN INTERNAL COMBUSTION ENGINE.
FR2929172A1 (en) NOISE REDUCING DEVICE FOR THE AIR CONDITIONING CIRCUIT OF A MOTOR VEHICLE, DRIVING AND CIRCUIT INCORPORATING IT
FR2512121A1 (en) FILLED GAS COMPONENT FOR DAMPING PRESSURE PULSATIONS
EP1520772B1 (en) Underbody deflector with sound shielding properties
KR100692069B1 (en) Noise cover combination structure of damper pulley
JPH06146916A (en) Timing belt cover of engine
FR2494473A1 (en) SEALING COVER FOR TIMING HOUSING OF AN INTERNAL COMBUSTION ENGINE
FR2966774A1 (en) Motor vehicle, has vibration damping device whose central portion is arranged in support against part of intermediate coil of suspension spring in non-sliding manner to permanently exert radial thrust on intermediate coil
EP1318297A1 (en) Noise-free starter flywheel
JPH09250355A (en) Timing belt cover of internal combustion engine
FR3118736A1 (en) Quick-fit acoustic protector.
WO2021093836A1 (en) Dual-arm tensioner
EP1692385A1 (en) Engine bearing device
FR2949595A1 (en) ACOUSTICAL ATTENUATION DEVICE
JPH06146915A (en) Timing belt cover of engine
FR3059060A1 (en) DEVICE FOR MAINTAINING AN ELECTRIC MOTOR IN AN ACTUATOR BODY
JPH0786327B2 (en) engine
FR2585411A1 (en) AIR FILTER DEVICE FOR INTERNAL COMBUSTION ENGINES
FR2833669A1 (en) DEVICE FOR ABSORBING VIBRATIONS FROM A MASSIVE PART

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20060914

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20061122

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20130301