WO2008047046A1 - Filtration crankshaft pulley - Google Patents

Filtration crankshaft pulley Download PDF

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Publication number
WO2008047046A1
WO2008047046A1 PCT/FR2007/052176 FR2007052176W WO2008047046A1 WO 2008047046 A1 WO2008047046 A1 WO 2008047046A1 FR 2007052176 W FR2007052176 W FR 2007052176W WO 2008047046 A1 WO2008047046 A1 WO 2008047046A1
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WO
WIPO (PCT)
Prior art keywords
filter element
pulley
shells
bearing surfaces
filtering
Prior art date
Application number
PCT/FR2007/052176
Other languages
French (fr)
Inventor
Fabrice Agnoli
Stanislas Pruski
Original Assignee
Renault S.A.S
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 Renault S.A.S filed Critical Renault S.A.S
Publication of WO2008047046A1 publication Critical patent/WO2008047046A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—Pulleys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
    • F16F15/124—Elastomeric springs
    • F16F15/126—Elastomeric springs consisting of at least one annular element surrounding the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
    • F16F15/1407—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers the rotation being limited with respect to the driving means
    • F16F15/1414—Masses driven by elastic elements
    • F16F15/1435—Elastomeric springs, i.e. made of plastic or rubber
    • F16F15/1442—Elastomeric springs, i.e. made of plastic or rubber with a single mass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—Pulleys
    • F16H2055/366—Pulleys with means providing resilience or vibration damping

Definitions

  • the present invention relates to a filtering equipment driving pulley comprising a filtering element held between two concentric bearing surfaces.
  • the present invention also relates to the process for obtaining such filtering pulleys.
  • the equipment drive pulleys are mounted at the end of the drive shaft to enable the rotational drive of one or more accessory equipment, such as an alternator, an air conditioning compressor, a water pump or other.
  • These pulleys differ from conventional pulleys in that they comprise crankshaft vibration damping means generally made in two distinct stages: a first damping stage of the torsional vibrations of the drive shaft and a second stage of filtration of the crankshafts. cyclic irregularities of the motor shaft. The relative movement between the two stages is generally ensured by the presence of one or more friction bearings.
  • an example of a drive pulley equipment of this type includes a first and a second ring, the latter constituting a seismic mass. These rings surround each other at a radial distance in which a first damping stage of the torsional vibrations of the motor shaft is arranged.
  • a second filter stage cyclic irregularities of the motor is disposed between a hub surrounding the end of the motor shaft and a support web that has the rim of the pulley on which the drive belt of the equipment is wound.
  • These floors include elastic means constrained in a radial direction around the motor shaft, these resilient means being preferably vulcanized to increase their strength while maintaining a high degree of flexibility.
  • the elastic means present in the second stage is said to be “filtering” and is more bulky and also of a hardness lower than that which is present in the first stage which is called "damping".
  • the compression ratios achieved only compensate for the surface tension due to cooling after the injection, but do not allow the elastic element to be positioned in uniform compression to improve its durability. If the uniformity of the prestressing obtained is generally not disadvantageous for the resilient means of torsion damping which has a moderate thickness, on the other hand, the uniformity of the prestressing of the elastic filtering means is generally insufficient. It is however on this elastic means that the stresses are the strongest because of a high engine torque at low speed, and a high power of the equipment. Indeed, all these parameters tend to increase the amplitude of the cyclic irregularities.
  • the invention proposes to solve the problem of the service life of these drive pulleys and in particular to ensure a uniform compression of the filtering elastic elements of the cyclic irregularities.
  • the invention relates to a filtering equipment driving pulley comprising a filtering element held between two concentric bearing surfaces, the filtering element being disposed inside a set of movable shells which define a housing which compresses the filter element between the bearing surfaces.
  • the filter element has a profile for distributing the stresses uniformly undergone when this element is compressed between the bearing surfaces; the insertion of the movable shells is obtained by hooping between the bearing surfaces, making it possible to have a reliable assembly of the pulley; the elastic element is an elastomer; the filter element is obtained by injection of an elastomer into the housing defined by the set of movable shells.
  • the invention also relates to the method of assembling such a pulley according to which there is a filter element inside a set of moving shells, then the filter element is compressed by arranging the set of shells between the shells. bearing surfaces, which makes it possible to achieve a strong and uniform compression in a filtering means of great thickness.
  • the inside of the shells is injected with the filter element with a profile capable of isoconstraining the filter element after mounting it in the pulley, which makes it possible to obtain uniformity of compression increased filter medium;
  • the shells are shirred between the bearing surfaces to compress the filter element.
  • the invention also relates to a motor vehicle provided with such a filtering equipment drive pulley fixed at the end of the motor shaft.
  • FIG. 1 is a sectional view along a plane transverse to the motor axis M of a half equipment drive pulley fixed on the axis M according to the invention
  • FIG. 2 is a front view of the equipment drive pulley in direction A according to one embodiment in which the pulley comprises four pairs of moving shells;
  • FIG. 3 is a front view of pairs of shells in which a filter element is placed before they are inserted into the drive pulley;
  • FIG. 4 is a front view of pairs of shells having a filter element after their insertion into the drive pulley.
  • the direction of the axis of rotation of the motor shaft is called M.
  • FIG. 1 is shown the equipment drive pulley 1 in section along a plane transverse to the motor axis M of an equipment drive pulley fixed on this axis M.
  • This pulley 1 comprises a primary element 2 adapted to be secured to the drive shaft, and a secondary element 3 intended to be connected to equipment, such as an alternator, a fan, via a belt taking place on the rim 4 of this element 3 so to transmit the rotation of the motor shaft to this equipment.
  • the rim 4 may have a profile for better grip and better guidance of the belt.
  • the primary element 2 consists of a first ring 5 extending in a direction substantially parallel to the axis M and takes place at the end of the motor shaft.
  • This primary element 2 also comprises a second ring 6 also substantially parallel to the axis M, placed at a radial distance D 1 from the first ring 5.
  • a flange 7 extending in a direction substantially perpendicular to the axis M, links two ends of the rings of revolution 5, 6 located on the same radial plane of the pulley 1 and is of a length approximately equal to this distance D 1.
  • At least one seismic mass 8 takes place on the second ring 6 of the primary element 2.
  • the seismic mass 8 can be unique and be in the form of rings surrounding the second ring 6 or consist of several elements equally distributed on the circumference of the second ring 6.
  • This mass 8 is secured to the second ring 6 by means of a resilient damping element 9 which may be in the form of a ring or as many elements as seismic masses 8 to be fixed.
  • the assembly consisting of the primary element, the seismic mass 8 and the elastic damping element 9 constitute a first damping stage of the torsional vibrations of the motor shaft.
  • the inertia provided by the seismic mass 8 and the elastic properties of the elastic damping element 9 are adapted to the characteristics of the motor shaft on which this assembly is mounted. More particularly, this elastic means
  • the secondary element 3 comprises a first ring 10 and a second ring January 1 extending in a direction substantially parallel to the axis M at a radial distance D2 of the first ring 10 and a flange 12 extending in a direction substantially perpendicular to the axis M which connects two ends of the rings of revolution 10, 1 1 located on the same radial plane of the pulley 1.
  • the flange 12 has a length substantially equal to the radial distance D2.
  • the radial distance D2 formed between the two rings 10, 1 1 of the secondary element 3 is adapted to receive the damping stage of the torsional vibrations of the motor shaft.
  • the second ring 11 may be integral with the pulley rim 4, that is to say that this second ring January 1 may constitute the rim 4.
  • a second stage of damping of the motor vibrations and more particularly of filtering of the cyclic irregularities of the motor shaft is disposed between the outer face of the first ring 5 of the primary element and the inner face of the first ring 10. of the secondary element.
  • This damping stage may comprise a pair of shells, an inner first 1 4 and a second outer 1 5 forming a space inside which is disposed a filter element 1 6.
  • This filter element 1 6 may be elastomer and can be arranged by proceeding by an injection of elastic material between the two shells 1 4, 1 5.
  • this compression is carried out uniformly through the filter element 1 6 thanks to the device and the method which will be described later in this description in connection with FIGS. 3 and 4.
  • At least one friction bearing 1 7, is disposed between the constituent elements of the damping stages.
  • the friction bearing 1 7 can be arranged between the outer face of the first ring 1 0 of the secondary element 3 and the inner face of the second ring 6 of the primary element 2.
  • This friction bearing 1 7 has the function to provide additional damping by friction in the first stage damping vibration of the motor shaft in torsion. An improvement in the damping of the natural mode of torsion of the motor shaft is thus obtained.
  • this friction bearing 1 7 is seen in the direction A, according to an embodiment in which the pulley 1 comprises four pairs of shells 14, 1, 5. From the outside, one observe the flange 1 2 of the secondary element 3, and in the center is observed the first ring 5 of the primary element 2. Between these two elements are arranged the pairs of shells 14, 1 5 and the filter element 1 6, which is subjected to uniform compression. This provides a lifetime of this increased filter stage, which contributes to increasing the longevity of the entire pulley 1 making it suitable for use with modern engines.
  • FIGs 3 and 4 illustrate the compression of the filter element 1 6 according to an embodiment wherein the second damping stage comprises two pairs of shells 1 4, 1 5.
  • An inter-piece distance is defined by the distance separating the external face of the first ring 5 from the primary element 2 and the internal face of the first ring 10 of the secondary element 3 between which the second damping stage takes place and an inter-shell distance by the distance separating the first inner shell 14 and the second outer shell 15 before mounting in the pulley 1.
  • FIG. 3 shows the pairs of shells 14, 1 5 in which the filter element 1 6 is disposed before it is positioned in the pulley 1.
  • the inter-shell distance is greater than the inter-piece distance and the centers of the shell pairs 1 4, 1 5 which form arcs of circle are distinct.
  • FIG. 4 the pairs of shells 14, 15 are shown as they are after assembly in the pulley 1.
  • the reduction of the inter-shell distance with respect to the situation shown in FIG. 3 is observed, as well as the joining of the ends of the pairs of shells 14, which come into contact with each other. It is also observed that after assembly, the centers of pairs of shells 1 4, 1 5 are superimposed.
  • the ratio between the inter-piece distance and the inter-shell distance before mounting conditions the compression ratio of the filter element 1 6.
  • the compression ratio is chosen according to the level of stresses that the part must endure in engine operation, which amounts to choosing the ratio between the inter-piece distance and the inter-shell distance before assembly.
  • there is a self heating of the filter element 1 6 which has the effect of reducing its longevity.
  • a compromise on this ratio of distances must be found in order not to degrade the gain provided by the prestressing by a self heating of the filter element 1 6 if it is too constrained. It is therefore interesting to constrain the filter element 1 6 to the nearest of this limit value, which imposes d ⁇ compress this one as evenly as possible to avoid local self-heating.
  • the design of the elastomer during the injection inside the shells must take into account the final compression operation.
  • the filter element 1 6 is therefore placed in the pairs of shells 14, 15 with a profile so that it is found isocontraint after assembly of the pulley 1 and that the final stiffness of the part corresponds to that desired.
  • the reduction of the inter-shell distance to the value of the inter-piece distance can be obtained by shrinking the pairs of shells 14, 1 5 with the first ring 5 of the primary element 2 and the first ring 1 0 of the secondary element 3.

Abstract

The invention relates to a pulley for driving filtration equipment (1) comprising a filter element (16) held between two concentric bearing surfaces (5, 10), characterized in that the filter element (16) is located inside an assembly of movable shells (14, 15) defining a housing that compresses the filter element (16) between the bearing surfaces (5, 10).

Description

POULIE DE VILEBREQUIN FILTRANTE FILTER CRANKSHAFT PULLEY
La présente invention se rapporte à une poulie d'entraînement d'équipement filtrante comprenant un élément filtrant maintenu entre deux surfaces d'appui concentrique. La présente invention se rapporte aussi au procédé d'obtention de telles poulies filtrantes.The present invention relates to a filtering equipment driving pulley comprising a filtering element held between two concentric bearing surfaces. The present invention also relates to the process for obtaining such filtering pulleys.
Les poulies d'entraînement d'équipements sont montées à l'extrémité de l'arbre moteur pour permettre l'entraînement en rotation d'un ou plusieurs équipements accessoires, tels qu'un alternateur, un compresseur de climatisation, une pompe à eau ou autres. Ces poulies diffèrent des poulies classiques en ce qu'elles comportent des moyens d'amortissement des vibrations du vilebrequin généralement réalisés en deux étages distincts: un premier étage d'amortissement des vibrations de torsion de l'arbre moteur et un second étage de filtration des irrégularités cycliques de l'arbre moteur. Le mouvement relatif entre les deux étages est généralement assuré par la présence d'un ou plusieurs paliers de friction.The equipment drive pulleys are mounted at the end of the drive shaft to enable the rotational drive of one or more accessory equipment, such as an alternator, an air conditioning compressor, a water pump or other. These pulleys differ from conventional pulleys in that they comprise crankshaft vibration damping means generally made in two distinct stages: a first damping stage of the torsional vibrations of the drive shaft and a second stage of filtration of the crankshafts. cyclic irregularities of the motor shaft. The relative movement between the two stages is generally ensured by the presence of one or more friction bearings.
Dans les brevets EP0728957 et EP1462680 figurent un exemple d'une poulie d'entraînement d'équipements de ce type comportant une première et une seconde bague, cette dernière constituant une masse sismique. Ces bagues s'entourent mutuellement à une distance radiale dans laquelle un premier étage d'amortissement des vibrations de torsion de l'arbre moteur est disposé. Un deuxième étage de filtration des irrégularités cycliques du moteur est disposé entre un moyeu entourant le bout de l'arbre moteur et un voile d'appui que présente la jante de la poulie sur laquelle s'enroule la courroie d'entraînement des équipements. Ces étages comportent des moyens élastiques contraints suivant une direction radiale autour de l'arbre moteur, ces moyens élastiques étant de préférence vulcanisées pour accroître leur résistance tout en leur conservant un fort degré de flexibilité. Le moyen élastique présent dans le second étage est dit « filtrant » et est plus volumineux et également d'une dureté inférieure à celui qui est présent dans le premier étage qui est dit « d'amortissement » .In patents EP0728957 and EP1462680 an example of a drive pulley equipment of this type includes a first and a second ring, the latter constituting a seismic mass. These rings surround each other at a radial distance in which a first damping stage of the torsional vibrations of the motor shaft is arranged. A second filter stage cyclic irregularities of the motor is disposed between a hub surrounding the end of the motor shaft and a support web that has the rim of the pulley on which the drive belt of the equipment is wound. These floors include elastic means constrained in a radial direction around the motor shaft, these resilient means being preferably vulcanized to increase their strength while maintaining a high degree of flexibility. The elastic means present in the second stage is said to be "filtering" and is more bulky and also of a hardness lower than that which is present in the first stage which is called "damping".
Ces poulies d'entraînement d'équipements doivent atteindre une durée de vie de l'ordre de 300.000 à 400.000 Km. Pour cela, on précontraint fortement les moyens élastiques car leur efficacité de filtrage des vibrations est meilleure en compression alors que les propriétés en extension sont plus limitées et peuvent conduire à la rupture.These equipment drive pulleys must reach a service life of the order of 300,000 to 400,000 Km. For this purpose, the elastic means are strongly stressed because their vibration filtering efficiency is better in compression whereas the properties in extension are more limited and can lead to breakage.
Souvent, les taux de compression atteints compensent uniquement les tensions de surface dues au refroidissement après l'injection, mais ne permettent pas de positionner l'élément élastique en compression uniforme pour améliorer sa durabilité. Si l'uniformité de la précontrainte obtenue n'est généralement pas pénalisante pour le moyen élastique d'amortissement de torsion qui présente une épaisseur modérée, en revanche, l'uniformité de la précontrainte des moyens élastiques filtrants est généralement insuffisante. C'est pourtant sur ce moyen élastique que les sollicitations sont les plus fortes en raison d'un couple moteur élevé à bas régime, et d'une puissance élevée des équipements. En effet, tous ces paramètres tendent à augmenter l'amplitude des irrégularités cycliques.Often, the compression ratios achieved only compensate for the surface tension due to cooling after the injection, but do not allow the elastic element to be positioned in uniform compression to improve its durability. If the uniformity of the prestressing obtained is generally not disadvantageous for the resilient means of torsion damping which has a moderate thickness, on the other hand, the uniformity of the prestressing of the elastic filtering means is generally insufficient. It is however on this elastic means that the stresses are the strongest because of a high engine torque at low speed, and a high power of the equipment. Indeed, all these parameters tend to increase the amplitude of the cyclic irregularities.
En conséquence, ces moyens élastiques filtrants deviennent, généralement, le facteur limitant la durée de vie de l'ensemble de la poulie filtrante. L'invention se propose de résoudre le problème de durée de vie de ces poulies d'entraînement et notamment d'assurer une compression uniforme des éléments élastiques filtrants des irrégularités cycl iques. L'invention a pour objet une poulie d'entraînement d'équipement filtrante comprenant un élément filtrant maintenu entre deux surfaces d'appui concentriques, l'élément filtrant étant disposé à l'intérieur d'un ensemble de coquilles mobiles qui définissent un logement qui comprime l'élément filtrant entre les surfaces d'appui .As a result, these filtering elastic means generally become the factor limiting the service life of the entire filtering pulley. The invention proposes to solve the problem of the service life of these drive pulleys and in particular to ensure a uniform compression of the filtering elastic elements of the cyclic irregularities. The invention relates to a filtering equipment driving pulley comprising a filtering element held between two concentric bearing surfaces, the filtering element being disposed inside a set of movable shells which define a housing which compresses the filter element between the bearing surfaces.
Selon d'autres caractéristiques avantageuses de l'invention qui peuvent être prises séparément ou en combinaison : l'élément filtrant présente un profil permettant de répartir les contraintes subies uniformément lorsque cet élément est comprimé entre les surfaces d'appui ; l'insertion des coquilles mobiles est obtenu par frettage entre les surfaces d'appui , permettant d'avoir un assemblage de la poulie fiable ; - l'élément élastique est un élastomère ; l'élément filtrant est obtenu par injection d'un élastomère dans le logement défini par l'ensemble de coquilles mobiles.According to other advantageous features of the invention which can be taken separately or in combination: the filter element has a profile for distributing the stresses uniformly undergone when this element is compressed between the bearing surfaces; the insertion of the movable shells is obtained by hooping between the bearing surfaces, making it possible to have a reliable assembly of the pulley; the elastic element is an elastomer; the filter element is obtained by injection of an elastomer into the housing defined by the set of movable shells.
L'invention concerne également le procédé d'assemblage d'une telle poulie suivant lequel on dispose un élément filtrant à l'intérieur d'un ensemble de coquilles mobiles, puis on comprime l'élément filtrant en disposant l'ensemble de coquilles entre les surfaces d'appui , ce qui permet de réaliser une compression forte et uniforme dans un moyen filtrant d'épaisseur importante. Selon d'autres caractéristiques avantageuses de l'invention qui peuvent être prises séparément ou en combinaison :The invention also relates to the method of assembling such a pulley according to which there is a filter element inside a set of moving shells, then the filter element is compressed by arranging the set of shells between the shells. bearing surfaces, which makes it possible to achieve a strong and uniform compression in a filtering means of great thickness. According to other advantageous features of the invention which can be taken separately or in combination:
- l'on injecte, à l'intérieur des coquilles, l'élément filtrant avec un profil apte à réaliser une isocontrainte de l'élément filtrant après montage de celui-ci dans la poulie, ce qui permet d'obtenir une uniformité de compression du moyen filtrant augmentée ;the inside of the shells is injected with the filter element with a profile capable of isoconstraining the filter element after mounting it in the pulley, which makes it possible to obtain uniformity of compression increased filter medium;
- l'on frette l'ensemble de coquilles entre les surfaces d'appui pour comprimer l'élément filtrant.- The shells are shirred between the bearing surfaces to compress the filter element.
L'invention concerne également un véhicule automobile muni d'une telle poulie d'entraînement d'équipement filtrante fixée en bout d'arbre moteur.The invention also relates to a motor vehicle provided with such a filtering equipment drive pulley fixed at the end of the motor shaft.
D'autres caractéristiques et avantages de l'invention apparaîtront clairement à la lecture de la description suivante du mode de réalisation non limitatif de celle-ci, en liaison avec les dessins annexés sur lesquels :Other characteristics and advantages of the invention will become clear from reading the following description of the nonlimiting embodiment thereof, in conjunction with the appended drawings in which:
- la figure 1 est une vue en coupe selon un plan transversal à l'axe moteur M d'une demi poulie d'entraînement d'équipements fixée sur l'axe M selon l'invention;- Figure 1 is a sectional view along a plane transverse to the motor axis M of a half equipment drive pulley fixed on the axis M according to the invention;
- la figure 2 est une vue de face de la poulie d'entraînement d'équipements suivant la direction A selon un mode de réalisation dans lequel la poulie comporte quatre paires de coquilles mobiles; - la figure 3 est une vue de face des paires de coquilles dans lesquelles un élément filtrant est placé avant leur insertion dans la poulie d'entraînement ;FIG. 2 is a front view of the equipment drive pulley in direction A according to one embodiment in which the pulley comprises four pairs of moving shells; FIG. 3 is a front view of pairs of shells in which a filter element is placed before they are inserted into the drive pulley;
- la figure 4 est une vue de face des paires de coquilles comportant un élément filtrant après leur insertion dans la poulie d'entraînement. Dans la description qui va suivre, la direction de l'axe de rotation de l'arbre moteur est dénommée M. En outre, on parlera de face interne d'une pièce comme de la face orientée vers l'axe de rotation de l'arbre moteur M, et la face externe, la face opposée à cette face interne.- Figure 4 is a front view of pairs of shells having a filter element after their insertion into the drive pulley. In the following description, the direction of the axis of rotation of the motor shaft is called M. In addition, we will speak of the internal face of a workpiece as the face facing the axis of rotation of the motor shaft M, and the outer face, the face opposite to this inner face.
Sur la figure 1 est représentée la poulie d'entraînement d'équipements 1 en coupe selon un plan transversal à l'axe moteur M d'une poulie d'entraînement d'équipements fixée sur cet axe M. Cette poulie 1 comprend un élément primaire 2 apte à être solidarisé à l'arbre moteur, et un élément secondaire 3 destiné à être relié à un équipement, tel un alternateur, un ventilateur, par l'intermédiaire d'une courroie prenant place sur la jante 4 de cet élément 3 afin de transmettre la rotation de l'arbre moteur à cet équipement. La jante 4 peut avoir un profil permettant une meilleure accroche et un meilleur guidage de la courroie.In Figure 1 is shown the equipment drive pulley 1 in section along a plane transverse to the motor axis M of an equipment drive pulley fixed on this axis M. This pulley 1 comprises a primary element 2 adapted to be secured to the drive shaft, and a secondary element 3 intended to be connected to equipment, such as an alternator, a fan, via a belt taking place on the rim 4 of this element 3 so to transmit the rotation of the motor shaft to this equipment. The rim 4 may have a profile for better grip and better guidance of the belt.
L'élément primaire 2 est constitué d'une première bague 5 s'étendant selon une direction sensiblement parallèle à l'axe M et prend place à l'extrémité de l'arbre moteur. Cet élément primaire 2 comporte aussi une deuxième bague 6 également sensiblement parallèle à l'axe M, placée à une distance radiale D 1 de la première bague 5. Une flasque 7 s'étendant selon une direction sensiblement perpendiculaire à l'axe M, lie deux extrémités des bagues de révolution 5, 6 situées sur un même plan radial de la poulie 1 et est d'une longueur environ égale à cette distance D 1 .The primary element 2 consists of a first ring 5 extending in a direction substantially parallel to the axis M and takes place at the end of the motor shaft. This primary element 2 also comprises a second ring 6 also substantially parallel to the axis M, placed at a radial distance D 1 from the first ring 5. A flange 7 extending in a direction substantially perpendicular to the axis M, links two ends of the rings of revolution 5, 6 located on the same radial plane of the pulley 1 and is of a length approximately equal to this distance D 1.
Au moins une masse sismique 8 prend place sur la deuxième bague 6 de l'élément primaire 2. La masse sismique 8 peut être unique et se présenter sous forme d'anneaux entourant la deuxième bague 6 ou être constituée de plusieurs éléments également répartis sur la circonférence de la deuxième bague 6. Lorsque la masse sismique 8 est constituée de plusieurs éléments, on obtient un allégement de la poulie, ce qui diminue l'inertie du moteur par la réduction de la masse des éléments en rotation. Cette masse 8 est solidarisée à la deuxième bague 6 par l'intermédiaire d'un élément élastique d'amortissement 9 qui peut se présenter en anneau ou en autant d'éléments que de masses sismiques 8 à fixer. L'ensemble constitué de l'élément primaire, de la masse sismique 8 et de l'élément élastique d'amortissement 9 constituent un premier étage d'amortissement des vibrations de torsion de l'arbre moteur. L'inertie procurée par la masse sismique 8 et les propriétés élastiques de l'élément élastique d'amortissement 9 sont adaptées aux caractéristiques de l'arbre moteur sur lequel est monté cet ensemble. Plus particulièrement, ce moyen élastiqueAt least one seismic mass 8 takes place on the second ring 6 of the primary element 2. The seismic mass 8 can be unique and be in the form of rings surrounding the second ring 6 or consist of several elements equally distributed on the circumference of the second ring 6. When the seismic mass 8 consists of several elements, we obtain a lightening of the pulley, which reduces the inertia of the motor by reducing the mass of the rotating elements. This mass 8 is secured to the second ring 6 by means of a resilient damping element 9 which may be in the form of a ring or as many elements as seismic masses 8 to be fixed. The assembly consisting of the primary element, the seismic mass 8 and the elastic damping element 9 constitute a first damping stage of the torsional vibrations of the motor shaft. The inertia provided by the seismic mass 8 and the elastic properties of the elastic damping element 9 are adapted to the characteristics of the motor shaft on which this assembly is mounted. More particularly, this elastic means
9 peut être en élastomère ou toute matière présentant les caractéristiques requises pour amortir les vibrations du moteur.9 may be elastomeric or any material having the characteristics required to dampen the engine vibration.
L'élément secondaire 3 comporte une première bague 10 et une seconde bague 1 1 s'étendant selon une direction sensiblement parallèle à l'axe M à une distance radiale D2 de la première bague 10 et une flasque 12 s'étendant selon une direction sensiblement perpendiculaire à l'axe M qui lie deux extrémités des bagues de révolution 10, 1 1 situées sur un même plan radial de la poulie 1 . La flasque 12 a une longueur sensiblement égale à la distance radiale D2. La distance radiale D2 formée entre les deux bagues 10, 1 1 de l'élément secondaire 3 est adaptée à recevoir l'étage d'amortissement des vibrations de torsion de l'arbre moteur. La deuxième bague 1 1 peut être venue de matière avec la jante 4 de poulie, c'est- à-dire que cette deuxième bague 1 1 peut constituer la jante 4. U n deuxième étage d'amortissement des vibrations du moteur et plus particulièrement de filtration des irrégularités cycliques de l'arbre moteur est disposé entre la face externe de la première bague 5 de l'élément primaire et la face interne de la première bague 1 0 de l'élément secondaire. Cet étage d'amortissement peut comporter une paire de coquilles, une première interne 1 4 et une deuxième externe 1 5 formant un espace à l'intérieur duquel est disposé un élément filtrant 1 6. Cet élément filtrant 1 6 peut être de l'élastomère et peut y être disposé en procédant par une injection de matière élastique entre les deux coquilles 1 4, 1 5. Une fois l'étage d'amortissement positionné dans la poulie 1 , entre les premières bagues de l'élément primaire 5 et de l'élément secondaire 1 0, l'élément filtrant 1 6 est monté en compression afin d'augmenter sa longévité. Selon l'invention , cette compression est réalisée de façon uniforme à travers l'élément filtrant 1 6 grâce au dispositif et au procédé qui seront décrits plus loin dans cette description en relation avec les figures 3 et 4. Au moins un palier de friction 1 7, est disposé entre les éléments constitutifs des étages d'amortissement. Le palier de friction 1 7 peut être disposé entre la face externe de la première bague 1 0 de l'élément secondaire 3 et la face interne de la deuxième bague 6 de l'élément primaire 2. Ce palier de friction 1 7 a pour fonction d'apporter un amortissement supplémentaire par friction au premier étage d'amortissement des vibrations de l'arbre moteur en torsion . On obtient ainsi une amél ioration de l'amortissement du mode propre de torsion de l'arbre moteur. D'autres dispositions de ce palier de friction 1 7 sont envisagées, comme entre la face externe de la masse sismique 8 et la face interne de la deuxième bague 1 1 de l'élément secondaire 3, ou bien entre la flasque 12 de l'élément secondaire 3 et les extrémités affleurantes de la masse sismique 8, du moyen élastique d'amortissement 9 et de la deuxième bague 6 de l'élément primaire 2. En se reportant à la figure 2, on observe la poulie d'entraînement d'équipement 1 suivant la direction A, selon un mode de réalisation dans lequel la poulie 1 comporte quatre paires de coquilles 14, 1 5. En partant de l'extérieur, on observe la flasque 1 2 de l'élément secondaire 3, et tout au centre on observe la première bague 5 de l'élément primaire 2. Entre ces deux éléments sont disposés les paires de coquilles 14, 1 5 ainsi que l'élément filtrant 1 6, qui est soumis à une compression uniforme. On obtient ainsi une durée de vie de cet étage filtrant augmentée, ce qui concourre à augmenter la longévité de l'ensemble de la poulie 1 la rendant adaptée à une utilisation avec les moteurs modernes.The secondary element 3 comprises a first ring 10 and a second ring January 1 extending in a direction substantially parallel to the axis M at a radial distance D2 of the first ring 10 and a flange 12 extending in a direction substantially perpendicular to the axis M which connects two ends of the rings of revolution 10, 1 1 located on the same radial plane of the pulley 1. The flange 12 has a length substantially equal to the radial distance D2. The radial distance D2 formed between the two rings 10, 1 1 of the secondary element 3 is adapted to receive the damping stage of the torsional vibrations of the motor shaft. The second ring 11 may be integral with the pulley rim 4, that is to say that this second ring January 1 may constitute the rim 4. A second stage of damping of the motor vibrations and more particularly of filtering of the cyclic irregularities of the motor shaft is disposed between the outer face of the first ring 5 of the primary element and the inner face of the first ring 10. of the secondary element. This damping stage may comprise a pair of shells, an inner first 1 4 and a second outer 1 5 forming a space inside which is disposed a filter element 1 6. This filter element 1 6 may be elastomer and can be arranged by proceeding by an injection of elastic material between the two shells 1 4, 1 5. Once the damping stage positioned in the pulley 1, between the first rings of the primary element 5 and the 1 0 secondary element, the filter element 1 6 is mounted in compression to increase its longevity. According to the invention, this compression is carried out uniformly through the filter element 1 6 thanks to the device and the method which will be described later in this description in connection with FIGS. 3 and 4. At least one friction bearing 1 7, is disposed between the constituent elements of the damping stages. The friction bearing 1 7 can be arranged between the outer face of the first ring 1 0 of the secondary element 3 and the inner face of the second ring 6 of the primary element 2. This friction bearing 1 7 has the function to provide additional damping by friction in the first stage damping vibration of the motor shaft in torsion. An improvement in the damping of the natural mode of torsion of the motor shaft is thus obtained. Other arrangements of this friction bearing 1 7 are envisaged, such as between the external face of the seismic mass 8 and the internal face of the second ring 1 1 of the secondary element 3, or between the flange 12 of the secondary element 3 and the flush ends of the seismic mass 8, the elastic damping means 9 and the second ring 6 of the primary element 2. Referring to FIG. 2, the equipment drive pulley 1 is seen in the direction A, according to an embodiment in which the pulley 1 comprises four pairs of shells 14, 1, 5. From the outside, one observe the flange 1 2 of the secondary element 3, and in the center is observed the first ring 5 of the primary element 2. Between these two elements are arranged the pairs of shells 14, 1 5 and the filter element 1 6, which is subjected to uniform compression. This provides a lifetime of this increased filter stage, which contributes to increasing the longevity of the entire pulley 1 making it suitable for use with modern engines.
Les figures 3 et 4 illustrent la mise en compression de l'élément filtrant 1 6 selon un mode de réalisation dans lequel le deuxième étage d'amortissement comporte deux paires de coquilles 1 4, 1 5.Figures 3 and 4 illustrate the compression of the filter element 1 6 according to an embodiment wherein the second damping stage comprises two pairs of shells 1 4, 1 5.
On définit une distance inter-pièces par la distance séparant la face externe de la première bague 5 de l'élément primaire 2 et la face interne de la première bague 10 de l'élément secondaire 3 entre lesquelles le second étage d'amortissement prend place et une distance inter-coquille par la distance séparant la première coquille interne 14 et la deuxième coquille externe 15 avant le montage dans la poulie 1 .An inter-piece distance is defined by the distance separating the external face of the first ring 5 from the primary element 2 and the internal face of the first ring 10 of the secondary element 3 between which the second damping stage takes place and an inter-shell distance by the distance separating the first inner shell 14 and the second outer shell 15 before mounting in the pulley 1.
La figure 3 représente les paires de coquilles 14, 1 5 dans lesquelles est disposé l'élément filtrant 1 6 avant qu'il ne soit positionné dans la poulie 1 . Avant le positionnement dans la poulie 1 , la distance inter-coquille est supérieure à la distance inter-pièces et les centres des paires coquilles 1 4, 1 5 qui forment des arcs de cercle sont distincts.FIG. 3 shows the pairs of shells 14, 1 5 in which the filter element 1 6 is disposed before it is positioned in the pulley 1. Before positioning in the pulley 1, the inter-shell distance is greater than the inter-piece distance and the centers of the shell pairs 1 4, 1 5 which form arcs of circle are distinct.
A la figure 4, les paires de coquilles 1 4, 1 5 sont représentées telles qu'elles sont après assemblage dans la poulie 1 . On observe la réduction de la distance inter-coquille par rapport à la situation représentée à la figure 3 ainsi que la réunion des extrémités des paires de coquilles 1 4, 1 5 qui viennent en contact l'une avec l'autre. On observe aussi qu'après assemblage, les centres des paires de coquilles 1 4, 1 5 se superposent.In FIG. 4, the pairs of shells 14, 15 are shown as they are after assembly in the pulley 1. The reduction of the inter-shell distance with respect to the situation shown in FIG. 3 is observed, as well as the joining of the ends of the pairs of shells 14, which come into contact with each other. It is also observed that after assembly, the centers of pairs of shells 1 4, 1 5 are superimposed.
Le rapport entre la distance inter-pièces et la distance inter-coquil le avant montage conditionne le taux de compression de l'élément filtrant 1 6. Pour une distance inter- pièces déterminée, plus on augmente la distance inter-coquille avant montage, et plus le taux de compression dans l'élément filtrant 1 6 augmente après que celui-ci soit monté dans la poulie 1 .The ratio between the inter-piece distance and the inter-shell distance before mounting conditions the compression ratio of the filter element 1 6. For a given inter-part distance, the greater the inter-shell distance before assembly, and the higher the compression ratio in the filter element 1 6 increases after it is mounted in the pulley 1.
On choisit le taux de compression en fonction du niveau de sollicitations que la pièce doit endurer en fonctionnement moteur, ce qui revient à choisir le rapport entre la distance inter-pièces et la distance inter-coquille avant montage. Cependant, à partir d'un certain taux de compression , on assiste à un auto échauffement de l'élément filtrant 1 6 qui a pour conséquence de réduire sa longévité. Il en résulte qu'un compromis sur ce rapport de distances doit être trouvé pour ne pas dégrader le gain apporté par la précontrainte par un auto échauffement de l'élément fi ltrant 1 6 si celui-ci est trop contraint. I I est donc en cela intéressant de contraindre l'élément filtrant 1 6 au plus proche de cette valeur limite, ce qui impose dθ compresser celui-ci le plus uniformément possible afin que d'éviter des auto échauffements locaux. Pour s'assurer d'une meilleure uniformité de la compression, le design de l'élastomère lors de l'injection à l'intérieur des coquilles doit prendre en compte l'opération finale de compression. L'élément filtrant 1 6 est donc disposé dans les paires de coquilles 14, 15 avec un profil afin que celui-ci se retrouve à isocontrainte après assemblage de la poulie 1 et que la raideur finale de la pièce corresponde à celle souhaitée. Selon une variante de l'invention, la réduction de la distance inter-coquille à la valeur de la distance inter-pièces peut être obtenue par frettage des paires de coquilles 14, 1 5 avec la première bague 5 de l'élément primaire 2 et la première bague 1 0 de l'élément secondaire 3. The compression ratio is chosen according to the level of stresses that the part must endure in engine operation, which amounts to choosing the ratio between the inter-piece distance and the inter-shell distance before assembly. However, from a certain compression ratio, there is a self heating of the filter element 1 6 which has the effect of reducing its longevity. As a result, a compromise on this ratio of distances must be found in order not to degrade the gain provided by the prestressing by a self heating of the filter element 1 6 if it is too constrained. It is therefore interesting to constrain the filter element 1 6 to the nearest of this limit value, which imposes dθ compress this one as evenly as possible to avoid local self-heating. To ensure a better uniformity of compression, the design of the elastomer during the injection inside the shells must take into account the final compression operation. The filter element 1 6 is therefore placed in the pairs of shells 14, 15 with a profile so that it is found isocontraint after assembly of the pulley 1 and that the final stiffness of the part corresponds to that desired. According to a variant of the invention, the reduction of the inter-shell distance to the value of the inter-piece distance can be obtained by shrinking the pairs of shells 14, 1 5 with the first ring 5 of the primary element 2 and the first ring 1 0 of the secondary element 3.

Claims

REVENDICATIONS
1) Poulie d'entraînement d'équipement filtrante (1) comprenant un élément filtrant (16) maintenu entre deux surfaces (5, 10) d'appui concentriques caractérisé en ce que l'élément filtrant (16) est disposé à l'intérieur d'un ensemble de coquilles internes (14) et externes (15) mobiles définissant un logement qui comprime l'élément filtrant (16) entre les surfaces d'appui (5, 10).1) filtering equipment driving pulley (1) comprising a filter element (16) held between two concentric bearing surfaces (5, 10), characterized in that the filtering element (16) is arranged inside a set of movable inner (14) and outer (15) shells defining a housing which compresses the filter element (16) between the bearing surfaces (5, 10).
2) Poulie d'entraînement d'équipement filtrante (1) selon la revendication 1 caractérisé en ce que l'élément filtrant (16) présente un profil permettant de répartir les contraintes subies uniformément lorsque cet élément (16) est comprimé entre les surfaces d'appui (5, 10).2) filtering equipment driving pulley (1) according to claim 1 characterized in that the filter element (16) has a profile for distributing the stresses uniformly undergone when the element (16) is compressed between the surfaces of support (5, 10).
3) Poulie d'entraînement d'équipement filtrante (1) selon l'une des revendications précédentes caractérisé en ce que l'insertion des coquilles internes (14) et externes (15) est obtenu par frettage entre les surfaces d'appui (5, 10).3) filtering equipment driving pulley (1) according to one of the preceding claims characterized in that the insertion of the inner shells (14) and outer (15) is obtained by hooping between the bearing surfaces (5). , 10).
4) Poulie d'entraînement d'équipement filtrante (1) selon l'une des revendications précédentes caractérisé en ce que l'élément filtrant (16) est un élastomère.4) filtering equipment driving pulley (1) according to one of the preceding claims characterized in that the filter element (16) is an elastomer.
5) Poulie d'entraînement d'équipement filtrante (1) selon l'une des revendications précédentes caractérisé en ce que l'élément filtrant (16) est obtenu par injection d'un élastomère dans le logement défini par ensemble de coquilles internes (14) et externes (15).5) Filter equipment driving pulley (1) according to one of the preceding claims characterized in that the filter element (16) is obtained by injection of a elastomer in the housing defined by set of inner (14) and outer (15) shells.
6) Procédé d'assemblage d'une poulie (1) suivant l'une quelconque des revendications 1 à 5 caractérisé en ce que l'on dispose un élément filtrant (16) à l'intérieur d'un ensemble de coquilles internes (14) et externes (15) mobiles, puis on comprime l'élément filtrant (16) en disposant l'ensemble de coquilles internes (14) et externes (15) mobiles entre les surfaces d'appui (5, 10).6) A method of assembling a pulley (1) according to any one of claims 1 to 5 characterized in that one disposes a filter element (16) inside a set of internal shells (14). ) and external (15) mobile, then the filter element (16) is compressed by arranging the set of internal shells (14) and external (15) movable between the bearing surfaces (5, 10).
7) Procédé d'assemblage d'une poulie (1) suivant la revendication 6 caractérisé en ce que l'on frette l'ensemble de coquilles internes (14) et externes (15) entre les surfaces d'appui (5, 10) pour comprimer l'élément filtrant (16).7) A method of assembling a pulley (1) according to claim 6 characterized in that it frets the set of inner shells (14) and outer (15) between the bearing surfaces (5, 10) for compressing the filter element (16).
8) Procédé d'assemblage d'une poulie (1) suivant l'une des revendications 6 ou 7 caractérisé en ce que l'on injecte, à l'intérieur des coquilles internes (14) et externes (15), l'élément filtrant (16) avec un profil apte à réaliser une isocontrainte de l'élément filtrant (16) après montage de celui-ci dans la poulie8) A method of assembling a pulley (1) according to one of claims 6 or 7 characterized in that is injected, inside the inner shells (14) and outer (15), the element filter (16) with a profile adapted to perform isocontraint of the filter element (16) after mounting it in the pulley
(1)-(1) -
9) Véhicule automobile caractérisé en ce qu'il comporte une poulie d'entraînement d'équipement filtrante (1) fixée en bout d'arbre moteur selon l'une des revendications 1 à 5. 9) A motor vehicle characterized in that it comprises a filtering equipment driving pulley (1) fixed at the end of the motor shaft according to one of claims 1 to 5.
PCT/FR2007/052176 2006-10-20 2007-10-17 Filtration crankshaft pulley WO2008047046A1 (en)

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Application Number Priority Date Filing Date Title
FR0654395A FR2907529B1 (en) 2006-10-20 2006-10-20 FILTER CRANKSHAFT PULLEY.
FR0654395 2006-10-20

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FR3024192A1 (en) * 2014-07-23 2016-01-29 Renault Sas GUIDE PULLEY FOR MOTOR VEHICLE
EP3152458A4 (en) * 2014-06-09 2018-03-14 Dayco IP Holdings, LLC Torsional vibration damper with an interlocked isolator
US10030757B2 (en) 2014-07-01 2018-07-24 Dayco Ip Holdings, Llc Torsional vibration damper with an interlocked isolator
US10330148B2 (en) 2014-02-26 2019-06-25 Airbus Helicopters Deutschland GmbH Bearing arrangement with a first bearing layer and a second bearing layer
JP2019206992A (en) * 2018-05-29 2019-12-05 Nok株式会社 Torque variation absorption damper

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US5405296A (en) * 1993-12-28 1995-04-11 Tesma International Inc. Torsional vibration damper
EP1462680A1 (en) * 2003-03-27 2004-09-29 Fujikiko Kabushiki Kaisha Power transmission
US20050261093A1 (en) * 2004-05-21 2005-11-24 Denso Corporation Power transmission device

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Publication number Priority date Publication date Assignee Title
US5405296A (en) * 1993-12-28 1995-04-11 Tesma International Inc. Torsional vibration damper
EP1462680A1 (en) * 2003-03-27 2004-09-29 Fujikiko Kabushiki Kaisha Power transmission
US20050261093A1 (en) * 2004-05-21 2005-11-24 Denso Corporation Power transmission device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10330148B2 (en) 2014-02-26 2019-06-25 Airbus Helicopters Deutschland GmbH Bearing arrangement with a first bearing layer and a second bearing layer
EP3152458A4 (en) * 2014-06-09 2018-03-14 Dayco IP Holdings, LLC Torsional vibration damper with an interlocked isolator
US10030757B2 (en) 2014-07-01 2018-07-24 Dayco Ip Holdings, Llc Torsional vibration damper with an interlocked isolator
FR3024192A1 (en) * 2014-07-23 2016-01-29 Renault Sas GUIDE PULLEY FOR MOTOR VEHICLE
JP2019206992A (en) * 2018-05-29 2019-12-05 Nok株式会社 Torque variation absorption damper
JP7175104B2 (en) 2018-05-29 2022-11-18 Nok株式会社 Torque fluctuation absorption damper

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FR2907529A1 (en) 2008-04-25

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