EP2464828B1 - Vibration-damping shim for a fan blade - Google Patents

Vibration-damping shim for a fan blade Download PDF

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Publication number
EP2464828B1
EP2464828B1 EP10739952.9A EP10739952A EP2464828B1 EP 2464828 B1 EP2464828 B1 EP 2464828B1 EP 10739952 A EP10739952 A EP 10739952A EP 2464828 B1 EP2464828 B1 EP 2464828B1
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EP
European Patent Office
Prior art keywords
upstream
radially
downstream
platform
fan
Prior art date
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Application number
EP10739952.9A
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German (de)
French (fr)
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EP2464828A1 (en
Inventor
Laurent Bilz
Fabrice Marois
Patrick Jean-Louis Reghezza
Julien Tran
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Safran Aircraft Engines SAS
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SNECMA SAS
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Publication of EP2464828A1 publication Critical patent/EP2464828A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/10—Anti- vibration means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/005—Sealing means between non relatively rotating elements
    • F01D11/006—Sealing the gap between rotor blades or blades and rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/04—Antivibration arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/26—Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3053—Fixing blades to rotors; Blade roots ; Blade spacers by means of pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/80—Platforms for stationary or moving blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y10S416/50—Vibration damping features

Definitions

  • the present invention relates generally to a fan for an aircraft turbomachine, preferably for a turbojet engine. More specifically, the invention relates vibration damping wedges interposed between the blade platform and the fan disk.
  • a blower 1 for a turbojet engine known from the prior art is shown on the figure 1 . It has a disk 2 centered on a longitudinal axis 4, corresponding to the axis of rotation of the fan. Blower vanes 6 are mounted at the periphery of the disc in a conventional manner and regularly distributed around the axis 4.
  • vibration damping wedge 10 interposed radially between the platform 12 of the blade and the periphery of the disk 2.
  • this wedge takes the form of an elastomer block 14 equipped contact pads 16a, 16b provided to reduce the vibration levels of the fan blades.
  • the shim 10 is provided with a radially outer surface 18 equipped with two plates 16a, 16b of contact with the platform 12, as well as with a radially inner surface 20 formed by an upstream surface 22 facing the disc 2 and a downstream surface 24 separated from the upstream surface by a recess or level 26.
  • upstream and downstream are to consider with respect to a direction of thrust generated by the fan, shown schematically by the arrow 5.
  • the upstream surface 22 is located radially inward with respect to the downstream surface 24.
  • the upstream surface 22 is centered on a transverse median plane of the disc 2 opposite which it is located.
  • the downstream surface 24 is located radially right and facing a fastening flange 28 provided in one piece with the disk, and protruding radially outwards. This flange 28 permits the bolt mounting of an axial abutment shim 30 preventing the vibration damping wedge 10 from escaping backward.
  • the shim 30 has a radially outer flange 32 against which is abutted an axial abutment plate 34 provided on the shim 10, at the radially upper portion of its downstream end surface 36.
  • the stop plate 34 also extends on the downstream surface 24, thus adopting an inverted L-shaped section.
  • the stop plate is preferably metallic.
  • each flange 28 is provided in one piece with a radial tooth 23 of the disc 2, these teeth 23 being spaced circumferentially from each other and defining between them notches intended to accommodate the blade root 6.
  • one or more material recesses 40 open axially and each housing a portion of a bolt 42 for mounting of the stop block 30 on the flange 28.
  • the recess 26 comparable to a radially facing surface facing downstream, constitutes a demarcation on either side of which are respectively the upstream plate 16a contact with the platform and the downstream contact plate 16b with the same platform.
  • each wedge 10 can extend over an angular sector of only a few degrees.
  • the invention therefore aims to at least partially overcome the disadvantages mentioned above, relating to the achievements of the prior art.
  • the invention is defined by claim 1.
  • the subject of the invention is a vibration damping wedge intended to be interposed between a fan blade platform and a fan disk, said wedge being provided with a radially outer surface equipped with at least one contact plate with the fan blade platform, as well as a radially inner surface formed by an upstream surface intended to face said disc and a downstream surface separated from the upstream surface by a recess, said upstream surface being located radially inwardly with respect to said downstream surface.
  • said upstream surface has a radially inwardly projecting zone, initiated at a distance from its upstream end.
  • this protruding zone makes it possible to limit the amplitude of the tilting of the wedge described above, because this zone is located closest to the periphery of the disk with which it is capable of rapidly coming to a stop, when Insufficient centrifugal force does not make it possible to obtain the plating of the radially outer surface of the damping wedge against the platform.
  • this limitation of the tilting amplitude of the shim results from the position downstream of the projecting zone.
  • this edge when contact occurs between the upstream edge of the projecting zone and the disc, following a limited tilting of the wedge towards the front, this edge is at a low angle limiting its wear. Indeed, this low angle is synonymous with significant contact surface between the edge and the disc, limiting the risk of premature wear of the hold.
  • the position of the projecting zone, at a distance from the upstream end of the upstream surface and upstream of the recess makes it possible not to unbalance the shim in its entirety, which makes it possible to find its center of gravity in the same area in which it was on the damping wedges of the prior art with substantially flat upstream surface.
  • the damping wedge comprises an upstream plate of contact with the fan blade platform and a downstream contact plate with the fan blade platform, respectively arranged upstream and downstream relative to said recess.
  • said protruding zone is located radially in line with said upstream contact plate.
  • the damping wedge comprises a downstream end surface, a radially upper portion of which is equipped with an axial abutment plate.
  • said projecting zone extends axially over approximately 40 to 70% of said upstream surface of the radially inner surface.
  • said recess has one or more material recesses open axially downstream.
  • the invention also relates to an aircraft turbomachine fan comprising a fan disk and a plurality of fan blades mounted on the disk, each blade having a platform and at least one vibration damping shim such as as described above, interposed between said platform and the disk.
  • a single vibration damping wedge is placed under a same fan blade.
  • the upstream surface 22 located upstream of the recess 26 is no longer flat or slightly curved as in the prior art, but has a region 101 projecting radially inward, initiated at a distance from its upstream end 22a.
  • the upstream surface 22 of the radially inner surface 20 begins with a recess 103 initiated from the upstream end or edge 22a, then encounters a radially inwardly directed recess 105 which initiates the projecting zone 101. This extends downstream to the detachment 26.
  • the recess 103 and the projecting zone 101 each have a substantially flat surface facing the disc 2, or slightly curved inwards to follow the profile of this disc. They therefore each extend homogeneously along the circumferential direction of the shim, at different distances from the disk 2, the zone 101 being closer.
  • the projecting zone 101 extends axially over approximately 40 to 70% of the upstream surface 22, and lies at the right, in the radial direction, of the upstream contact plate 16a.

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention se rapporte de façon générale à une soufflante pour turbomachine d'aéronef, de préférence pour turboréacteur. Plus précisément, l'invention concerne les cales amortisseuses de vibrations interposées entre la plateforme des aubes et le disque de soufflante.The present invention relates generally to a fan for an aircraft turbomachine, preferably for a turbojet engine. More specifically, the invention relates vibration damping wedges interposed between the blade platform and the fan disk.

ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART

Une soufflante 1 pour turboréacteur connue de l'art antérieur est montrée sur la figure 1. Elle présente un disque 2 centré sur axe longitudinal 4, correspondant à l'axe de rotation de la soufflante. Des aubes de soufflante 6 sont montées à la périphérie du disque de façon conventionnelle, et réparties régulièrement autour de l'axe 4.A blower 1 for a turbojet engine known from the prior art is shown on the figure 1 . It has a disk 2 centered on a longitudinal axis 4, corresponding to the axis of rotation of the fan. Blower vanes 6 are mounted at the periphery of the disc in a conventional manner and regularly distributed around the axis 4.

De plus, associée à chaque aube 6, il est prévu une cale amortisseuse de vibrations 10 interposée radialement entre la plateforme 12 de l'aube et la périphérie du disque 2. Globalement, cette cale prend la forme d'un bloc en élastomère 14 équipé de plaquettes de contact 16a, 16b prévues pour réduire les niveaux de vibration des aubes de soufflante.In addition, associated with each blade 6, there is provided a vibration damping wedge 10 interposed radially between the platform 12 of the blade and the periphery of the disk 2. Generally, this wedge takes the form of an elastomer block 14 equipped contact pads 16a, 16b provided to reduce the vibration levels of the fan blades.

Plus précisément, la cale 10 est pourvue d'une surface radialement extérieure 18 équipée des deux plaquettes 16a, 16b de contact avec la plateforme 12, ainsi que d'une surface radialement intérieure 20 formée par une surface amont 22 en regard du disque 2 et une surface aval 24 séparée de la surface amont par un décrochement ou niveau 26. A cet égard, dans toute la description qui va suivre, les termes « amont » et « aval » sont à considérer par rapport à une direction de poussée générée par la soufflante, schématisée par la flèche 5.More specifically, the shim 10 is provided with a radially outer surface 18 equipped with two plates 16a, 16b of contact with the platform 12, as well as with a radially inner surface 20 formed by an upstream surface 22 facing the disc 2 and a downstream surface 24 separated from the upstream surface by a recess or level 26. In this regard, throughout the following description, the terms "upstream" and "downstream" are to consider with respect to a direction of thrust generated by the fan, shown schematically by the arrow 5.

Sur la surface radialement interne 20, la surface amont 22 est située radialement vers l'intérieur par rapport à la surface aval 24. La surface amont 22 est centrée sur un plan médian transversal du disque 2 en regard duquel elle se trouve. En revanche, la surface aval 24 se situe au droit radialement et en regard d'une bride de fixation 28 prévue d'un seul tenant avec le disque, et faisant saillie radialement vers l'extérieur. Cette bride 28 permet le montage par boulons d'une cale de butée axiale 30 empêchant la cale amortisseuse de vibrations 10 de s'échapper vers l'arrière. A cet égard, il est noté que la cale 30 présente une collerette radialement extérieure 32 contre laquelle est en appui une plaquette de butée axiale 34 prévue sur la cale 10, au niveau de la partie radialement supérieure de sa surface d'extrémité aval 36. Comme le montre clairement la figure 1, la plaquette de butée 34 se prolonge également sur la surface aval 24, adoptant ainsi une section en forme de L inversé. Tout comme les plaquettes de contact 16a, 16b, la plaquette de butée est préférentiellement métallique.On the radially inner surface 20, the upstream surface 22 is located radially inward with respect to the downstream surface 24. The upstream surface 22 is centered on a transverse median plane of the disc 2 opposite which it is located. On the other hand, the downstream surface 24 is located radially right and facing a fastening flange 28 provided in one piece with the disk, and protruding radially outwards. This flange 28 permits the bolt mounting of an axial abutment shim 30 preventing the vibration damping wedge 10 from escaping backward. In this respect, it is noted that the shim 30 has a radially outer flange 32 against which is abutted an axial abutment plate 34 provided on the shim 10, at the radially upper portion of its downstream end surface 36. As clearly shown in figure 1 , the stop plate 34 also extends on the downstream surface 24, thus adopting an inverted L-shaped section. Like the contact pads 16a, 16b, the stop plate is preferably metallic.

De plus, chaque bride 28 est prévue d'un seul tenant avec une dent radiale 23 du disque 2, ces dents 23 étant espacées circonférentiellement les unes des autres et définissant entre-elles des encoches destinées à loger le pied des aubes 6.In addition, each flange 28 is provided in one piece with a radial tooth 23 of the disc 2, these teeth 23 being spaced circumferentially from each other and defining between them notches intended to accommodate the blade root 6.

Sur le décrochement 26 de la cale 10, considéré comme constituant la partie radialement interne de la surface d'extrémité aval 36, il est prévu un ou plusieurs évidements de matière 40 ouverts axialement et logeant chacun une partie d'un boulon 42 servant au montage de la cale de butée 30 sur la bride 28.On the recess 26 of the shim 10, considered as constituting the radially inner portion of the downstream end surface 36, there is provided one or more material recesses 40 open axially and each housing a portion of a bolt 42 for mounting of the stop block 30 on the flange 28.

En outre, il est noté que le décrochement 26, assimilable à une surface orientée radialement en regard vers l'aval, constitue une démarcation de part et d'autre de laquelle se situent respectivement la plaquette amont 16a de contact avec la plateforme ainsi que la plaquette aval 16b de contact avec cette même plateforme.In addition, it is noted that the recess 26, comparable to a radially facing surface facing downstream, constitutes a demarcation on either side of which are respectively the upstream plate 16a contact with the platform and the downstream contact plate 16b with the same platform.

Enfin, il est noté que les surfaces amont et aval 22, 24 sont chacune sensiblement planes, voire légèrement bombées vers l'intérieur pour suivre le profil du disque 2. A cet égard, chaque cale 10 peut s'étendre sur un secteur angulaire de quelques degrés seulement.Finally, it is noted that the upstream and downstream surfaces 22, 24 are each substantially flat, or even slightly domed inwards to follow the profile of the disk 2. In this respect, each wedge 10 can extend over an angular sector of only a few degrees.

En fonctionnement normal de la soufflante, les efforts centrifuges permettent à la cale amortisseuse 10 de se plaquer sur le dessous de la plateforme 12 de l'aube 6, comme montré sur la figure 1. La restitution de l'effort centrifuge par le contact des plaquettes 16a, 16b avec les parties correspondantes de la plateforme permet de diminuer les niveaux vibratoires de l'aube.In normal operation of the blower, the centrifugal forces allow the damping wedge 10 to be pressed on the underside of the platform 12 of the blade 6, as shown in FIG. figure 1 . The restitution of the centrifugal force by the contact of the plates 16a, 16b with the corresponding parts of the platform makes it possible to reduce the vibratory levels of the blade.

En revanche, en mode autorotation due au vent (de l'anglais « windmilling »), l'absence quasi-totale de cet effort centrifuge, cumulé au basculement de l'aube 6 vers l'amont du rotor, augmente l'espace entre la plateforme 12 et la périphérie du disque qui peut induire un déplacement non désiré de la cale 10. Un tel déplacement est schématisé sur la figure 2, montrant en basculement de la cale amortisseuse 10 vers l'avant, et donc une consommation du jeu initialement prévu entre l'extrémité amont 22a de la surface amont 22 et la périphérie du disque 2, ici constituée par la surface radiale extérieure 23a de la dent 23 en regard de laquelle se trouve la cale 10.On the other hand, in the windmilling mode, the almost total absence of this centrifugal force, combined with the tilting of the blade 6 towards the upstream of the rotor, increases the space between the platform 12 and the periphery of the disc which can induce an unwanted displacement of the shim 10. Such a displacement is schematized on the figure 2 , showing in tilting of the damping shim 10 towards the front, and thus a consumption of the clearance initially provided between the upstream end 22a of the upstream surface 22 and the periphery of the disk 2, here constituted by the outer radial surface 23a of the tooth 23 opposite which is the hold 10.

Le mauvais positionnement occupé par la cale 10 peut occasionner son usure prématurée ainsi que celle des pièces en contact. Plus précisément, le basculement vers l'avant de la cale 10 a pour conséquence habituelle la perte de contact entre la plaquette de butée axiale 34 et sa cale de butée associée 30, et la perte de contact entre la plaquette de contact amont 16a et sa portion associée de la plateforme. Un contact d'intensité très important subsiste alors entre la plaquette de contact aval 16b et sa portion associée de la plateforme, ainsi qu'entre l'extrémité ou arête amont 22a de la surface amont 22 et le disque 2, avec pour conséquence les risques d'usure prématurée mentionnés ci-dessus. EP 0110744 et GB 2038959 décrivent des cales engagées entre le pied de l'aube et le fond de l'alvéole.The wrong positioning occupied by the wedge 10 can cause its premature wear as well as that of the parts in contact. Specifically, the forward tilting of the shim 10 has the usual consequence of the loss of contact between the axial abutment plate 34 and its associated abutment shim 30, and the loss of contact between the upstream contact plate 16a and its associated portion of the platform. A very high intensity contact then remains between the downstream contact pad 16b and its associated portion of the platform, as well as between the upstream end or edge 22a of the upstream surface 22 and the disk 2, with consequent risks. premature wear mentioned above. EP 0110744 and GB 2038959 describe wedges engaged between the foot of the blade and the bottom of the cell.

EXPOSÉ DE L'INVENTIONSTATEMENT OF THE INVENTION

L'invention a donc pour but de remédier au moins partiellement aux inconvénients mentionnés ci-dessus, relatifs aux réalisations de l'art antérieur.The invention therefore aims to at least partially overcome the disadvantages mentioned above, relating to the achievements of the prior art.

L'invention est définie par la revendication 1. L'invention a pour objet une cale amortisseuse de vibrations destinée à être interposée entre une plateforme d'aube de soufflante et un disque de soufflante, ladite cale étant pourvue d'une surface radialement extérieure équipée d'au moins une plaquette de contact avec la plateforme d'aube de soufflante, ainsi qu'une surface radialement intérieure formée par une surface amont destinée à être en regard dudit disque et une surface aval séparée de la surface amont par un décrochement, ladite surface amont étant située radialement vers l'intérieur par rapport à ladite surface aval. Selon l'invention, ladite surface amont présente une zone en saillie radialement vers l'intérieur, initiée à distance de son extrémité amont.The invention is defined by claim 1. The subject of the invention is a vibration damping wedge intended to be interposed between a fan blade platform and a fan disk, said wedge being provided with a radially outer surface equipped with at least one contact plate with the fan blade platform, as well as a radially inner surface formed by an upstream surface intended to face said disc and a downstream surface separated from the upstream surface by a recess, said upstream surface being located radially inwardly with respect to said downstream surface. According to the invention, said upstream surface has a radially inwardly projecting zone, initiated at a distance from its upstream end.

La présence de cette zone en saillie permet de limiter l'amplitude du basculement de la cale décrit ci-dessus, car cette zone se situe au plus prêt de la périphérie du disque avec laquelle elle est capable de venir rapidement en butée, lorsqu'un effort centrifuge insuffisant ne permet pas d'obtenir le plaquage de la surface radialement extérieure de la cale amortisseuse contre la plateforme. De plus, cette limitation de l'amplitude de basculement de la cale résulte de la position vers l'aval de la zone en saillie.The presence of this protruding zone makes it possible to limit the amplitude of the tilting of the wedge described above, because this zone is located closest to the periphery of the disk with which it is capable of rapidly coming to a stop, when Insufficient centrifugal force does not make it possible to obtain the plating of the radially outer surface of the damping wedge against the platform. In addition, this limitation of the tilting amplitude of the shim results from the position downstream of the projecting zone.

La limitation du basculement de la cale permet notamment de conserver le contact entre la plaquette de butée axiale et sa cale de butée associée.The limitation of the tilting of the wedge makes it possible in particular to maintain the contact between the axial abutment plate and its associated abutment shim.

En outre, lorsqu'il se produit un contact entre l'arête amont de la zone en saillie et le disque, suite à un basculement limité de la cale vers l'avant, cette arête se présente selon un angle faible limitant son usure. En effet, cet angle faible est synonyme de surface de contact importante entre l'arête et le disque, limitant les risques d'usure prématurée de la cale.In addition, when contact occurs between the upstream edge of the projecting zone and the disc, following a limited tilting of the wedge towards the front, this edge is at a low angle limiting its wear. Indeed, this low angle is synonymous with significant contact surface between the edge and the disc, limiting the risk of premature wear of the hold.

En outre, il est noté que la position de la zone saillie, à distance de l'extrémité amont de la surface amont et en amont du décrochement, permet de ne pas déséquilibrer la cale dans sa globalité, ce qui permet de retrouver son centre de gravité dans la même zone dans laquelle il se trouvait sur les cales amortisseuses de l'art antérieur à surface amont sensiblement plane.In addition, it is noted that the position of the projecting zone, at a distance from the upstream end of the upstream surface and upstream of the recess, makes it possible not to unbalance the shim in its entirety, which makes it possible to find its center of gravity in the same area in which it was on the damping wedges of the prior art with substantially flat upstream surface.

De préférence, la cale amortisseuse comprend une plaquette amont de contact avec la plateforme d'aube de soufflante ainsi qu'une plaquette aval de contact avec la plateforme d'aube de soufflante, agencées respectivement en amont et en aval par rapport audit décrochement.Preferably, the damping wedge comprises an upstream plate of contact with the fan blade platform and a downstream contact plate with the fan blade platform, respectively arranged upstream and downstream relative to said recess.

De préférence, ladite zone en saillie se situe radialement au droit de ladite plaquette amont de contact.Preferably, said protruding zone is located radially in line with said upstream contact plate.

De préférence, la cale amortisseuse comporte une surface d'extrémité aval dont une partie radialement supérieure est équipée d'une plaquette de butée axiale.Preferably, the damping wedge comprises a downstream end surface, a radially upper portion of which is equipped with an axial abutment plate.

De préférence, ladite zone en saillie s'étend axialement sur environ 40 à 70% de ladite surface amont de la surface radialement intérieure.Preferably, said projecting zone extends axially over approximately 40 to 70% of said upstream surface of the radially inner surface.

De préférence, ledit décrochement présente un ou plusieurs évidements de matière ouverts axialement vers l'aval.Preferably, said recess has one or more material recesses open axially downstream.

L'invention a également pour objet une soufflante pour turbomachine d'aéronef comprenant un disque de soufflante ainsi qu'une pluralité d'aubes de soufflante montées sur le disque, chaque aube présentant une plateforme ainsi qu'au moins un cale amortisseuse de vibrations telle que décrite ci-dessus, interposée entre ladite plateforme et le disque. De préférence, une seule cale amortisseuse de vibrations est placée sous une même aube de soufflante.The invention also relates to an aircraft turbomachine fan comprising a fan disk and a plurality of fan blades mounted on the disk, each blade having a platform and at least one vibration damping shim such as as described above, interposed between said platform and the disk. Preferably, a single vibration damping wedge is placed under a same fan blade.

D'autres avantages et caractéristiques de l'invention apparaîtront dans la description détaillée non limitative ci-dessous.Other advantages and features of the invention will become apparent in the detailed non-limiting description below.

BRÈVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

Cette description sera faite au regard des dessins annexés parmi lesquels ;

  • les figures 1 et 2, déjà décrites, représentent une soufflante de turboréacteur d'aéronef connue de l'art antérieur ;
  • la figure 3 représente une soufflante de turboréacteur d'aéronef selon un mode de réalisation préféré de la présente invention ; et
  • les figures 4 et 5 représentent deux vues en perspective de la cale amortisseuse de vibrations équipant la soufflante de la figure 3, selon deux angles de vue différents.
This description will be made with reference to the appended drawings among which;
  • the figures 1 and 2 , already described, represent an aircraft turbojet fan known from the prior art;
  • the figure 3 represents an aircraft turbojet blower according to a preferred embodiment of the present invention; and
  • the Figures 4 and 5 represent two perspective views of the damping wedge of vibrations equipping the blower of the figure 3 , according to two different angles of view.

EXPOSÉ DÉTAILLÉ DE MODES DE RÉALISATION PRÉFÉRÉSDETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

En référence aux figures 3 et 4, on peut voir une soufflante 1 de turboréacteur d'aéronef selon un mode de réalisation préféré de la présente invention. Cette soufflante diffère de celle décrite en référence aux figures 1 et 2 seulement par la forme de la surface amont 22 de la cale amortisseuse de vibrations 10. A cet égard, sur les figures, les éléments portant les mêmes références numériques correspondent à des éléments identiques ou similaires.With reference to figures 3 and 4 it is possible to see an aircraft turbojet fan 1 according to a preferred embodiment of the present invention. This blower differs from that described in reference to figures 1 and 2 only by the shape of the upstream surface 22 of the vibration damping shim 10. In this regard, in the figures, the elements bearing the same reference numerals correspond to identical or similar elements.

Ainsi, la surface amont 22 située en amont du décrochement 26 n'est plus plane ou légèrement bombée comme dans l'art antérieur, mais présente une zone 101 en saillie radialement vers l'intérieur, initiée à distance de son extrémité amont 22a.Thus, the upstream surface 22 located upstream of the recess 26 is no longer flat or slightly curved as in the prior art, but has a region 101 projecting radially inward, initiated at a distance from its upstream end 22a.

Par conséquent, la surface amont 22 de la surface radialement intérieure 20 débute par un renfoncement 103 initié à partir de l'extrémité ou arête amont 22a, puis rencontre un décrochement 105 orienté radialement vers l'intérieur, qui initie la zone en saillie 101. Celle-ci se prolonge vers l'aval jusqu'au décrochement 26.Consequently, the upstream surface 22 of the radially inner surface 20 begins with a recess 103 initiated from the upstream end or edge 22a, then encounters a radially inwardly directed recess 105 which initiates the projecting zone 101. This extends downstream to the detachment 26.

Le renfoncement 103 et la zone en saillie 101 présentent chacun une surface sensiblement plane en regard du disque 2, ou légèrement bombée vers l'intérieur pour suivre le profil de ce disque. Ils s'étendent donc chacun de façon homogène le long de la direction circonférentielle de la cale, à des distances différentes du disque 2, la zone 101 en étant plus rapprochée. De préférence, la zone en saillie 101 s'étend axialement sur environ 40 à 70% de la surface amont 22, et se situe au droit, selon la direction radiale, de la plaquette amont de contact 16a.The recess 103 and the projecting zone 101 each have a substantially flat surface facing the disc 2, or slightly curved inwards to follow the profile of this disc. They therefore each extend homogeneously along the circumferential direction of the shim, at different distances from the disk 2, the zone 101 being closer. Preferably, the projecting zone 101 extends axially over approximately 40 to 70% of the upstream surface 22, and lies at the right, in the radial direction, of the upstream contact plate 16a.

Comme montré sur la figure 3, lorsqu'il se produit un contact entre l'arête amont 107 de la zone en saillie 101 et la périphérie du disque 2 constituée par la surface radiale extérieure 23a de la dent 23, suite à un basculement limité de la cale 10 vers l'avant, cette arête 107 se présente selon un angle faible limitant son usure. De plus, toujours dans cette même situation rencontrée lorsqu'un effort centrifuge insuffisant ne permet pas d'obtenir le plaquage de la surface radialement extérieure 18 de la cale 10 contre la plateforme 12, la limitation du basculement de la cale 10 permet également de conserver le contact entre la plaquette de butée axiale 34 et sa cale de butée 30.As shown on the figure 3 when a contact occurs between the upstream edge 107 of the projecting zone 101 and the periphery of the disc 2 constituted by by the outer radial surface 23a of the tooth 23, following a limited tilting of the shim 10 towards the front, this edge 107 is at a small angle limiting its wear. In addition, still in the same situation encountered when insufficient centrifugal force does not make it possible to obtain the plating of the radially outer surface 18 of the shim 10 against the platform 12, the limitation of the tilting of the shim 10 also makes it possible to conserve the contact between the axial stop plate 34 and its stop block 30.

Toujours dans cette configuration schématisée sur la figure 3, il ne se crée pas de contact entre l'extrémité amont 22a de la surface amont 22 et la surface radiale extérieure 23a de la dent 23, de sorte qu'aucune usure prématurée n'est susceptible de se produire à cet endroit spécifique du bloc 14 en élastomère.Still in this schematic configuration on the figure 3 there is no contact between the upstream end 22a of the upstream surface 22 and the outer radial surface 23a of the tooth 23, so that no premature wear is likely to occur at this specific location of the block 14 elastomer.

Bien entendu, diverses modifications peuvent être apportées par l'homme du métier à l'invention qui vient d'être décrite, uniquement à titre d'exemples non limitatifs.Of course, various modifications may be made by those skilled in the art to the invention which has just been described, solely by way of non-limiting examples.

Claims (7)

  1. A vibration-damping shim (10) intended to be interposed between a platform (12) of a fan blade (6) and a fan disk (2), where said shim has a radially external surface (18) fitted with at least one plate (16a, 16b) in contact with the fan blade platform, and a radially internal surface (20) formed by an upstream surface (22), intended to be facing said disk (2), and a downstream surface (24) separated from the upstream surface by a break in alignment (26), where said upstream surface is located radially towards the interior relative to said downstream surface,
    characterised in that said upstream surface (22) has a zone (101) protruding radially towards the interior, initiated at some distance from its upstream end (22a), and the upstream surface (22) of the radially internal surface (20) starts by a recess (103) initiated from upstream end or ridge (22a), and then encounters a break in alignment (105) radially aligned towards the interior, which initiates protruding zone (101) .
  2. A damping shim according to claim 1, characterised in that it includes an upstream plate (16a) in contact with the fan blade platform, and a downstream plate (16b) in contact with the fan blade platform, positioned respectively upstream and downstream relative to said break in alignment (26).
  3. A damping shim according to claim 2, characterised in that said protruding zone (101) is located radially perpendicular to said upstream contact plate (16a).
  4. A damping shim according to any of the previous claims, characterised in that it includes a downstream end surface (36) a radially higher portion of which is fitted with an axial stop plate (34).
  5. A damping shim according to any of the previous claims, characterised in that said protruding zone (101) extends axially over approximately 40 to 70% of said upstream surface (22) of the radially internal surface (20).
  6. A damping shim according to any of the previous claims, characterised in that said break in alignment (26) has one or more recesses of matter (40) open axially in a downstream direction.
  7. A fan (1) for an aircraft turbomachine including a fan disk (2) and multiple fan blades (6) assembled on the disk, where each blade has a platform (12) and at least one vibration-damping shim (10) according to any of the previous claims, interposed between said platform and the disk.
EP10739952.9A 2009-08-11 2010-08-09 Vibration-damping shim for a fan blade Active EP2464828B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0955625A FR2949142B1 (en) 2009-08-11 2009-08-11 VIBRATION SHOCK ABSORBER BLOCK FOR BLOWER DAWN
PCT/EP2010/061534 WO2011018425A1 (en) 2009-08-11 2010-08-09 Vibration-damping shim for a fan blade

Publications (2)

Publication Number Publication Date
EP2464828A1 EP2464828A1 (en) 2012-06-20
EP2464828B1 true EP2464828B1 (en) 2016-10-05

Family

ID=42040528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10739952.9A Active EP2464828B1 (en) 2009-08-11 2010-08-09 Vibration-damping shim for a fan blade

Country Status (9)

Country Link
US (1) US8911210B2 (en)
EP (1) EP2464828B1 (en)
JP (1) JP5702783B2 (en)
CN (1) CN102472108B (en)
BR (1) BR112012002909B1 (en)
CA (1) CA2769781C (en)
FR (1) FR2949142B1 (en)
RU (1) RU2539924C2 (en)
WO (1) WO2011018425A1 (en)

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Also Published As

Publication number Publication date
FR2949142A1 (en) 2011-02-18
FR2949142B1 (en) 2011-10-14
RU2539924C2 (en) 2015-01-27
CN102472108B (en) 2014-12-31
CA2769781C (en) 2017-07-25
BR112012002909B1 (en) 2020-06-16
JP2013501883A (en) 2013-01-17
CN102472108A (en) 2012-05-23
US20120141296A1 (en) 2012-06-07
BR112012002909A2 (en) 2016-04-05
EP2464828A1 (en) 2012-06-20
US8911210B2 (en) 2014-12-16
JP5702783B2 (en) 2015-04-15
CA2769781A1 (en) 2011-02-17
WO2011018425A1 (en) 2011-02-17
RU2012108735A (en) 2013-09-20

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