EP2425100A1 - Strengthened fan-blade block - Google Patents

Strengthened fan-blade block

Info

Publication number
EP2425100A1
EP2425100A1 EP10718553A EP10718553A EP2425100A1 EP 2425100 A1 EP2425100 A1 EP 2425100A1 EP 10718553 A EP10718553 A EP 10718553A EP 10718553 A EP10718553 A EP 10718553A EP 2425100 A1 EP2425100 A1 EP 2425100A1
Authority
EP
European Patent Office
Prior art keywords
shim
foot
wedge
fan
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10718553A
Other languages
German (de)
French (fr)
Other versions
EP2425100B1 (en
Inventor
Patrick Jean-Louis Reghezza
Julien Tran
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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 SNECMA SAS filed Critical SNECMA SAS
Publication of EP2425100A1 publication Critical patent/EP2425100A1/en
Application granted granted Critical
Publication of EP2425100B1 publication Critical patent/EP2425100B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/04—Antivibration arrangements
    • F01D25/06—Antivibration arrangements for preventing blade vibration
    • 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
    • F01D5/3092—Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the present invention relates generally to the field of aircraft turbojet blowers, and more particularly to the shims intended to be interposed between the foot of the fan blades, and the bottom of the cells defined by the fan disk.
  • Such a turbojet fan is shown in an exploded manner in FIG. 1. It generally comprises a disk 2 centered on the axis 4 of the fan, a disk on the periphery of which are teeth 6 circumferentially spaced apart from each other, and extending each substantially longitudinally and radially, namely substantially parallel to the axis 4. Between two directly consecutive teeth 6 in the circumferential direction, these define a cell 8 intended to receive the foot 12 of a fan blade 10.
  • each tooth has an enlarged head so as to ensure the retention of the blades in the radial direction to the outside.
  • the cell 8 has a narrowed external radial end allowing the stamina of the blade 10 to pass, with a narrowed section compared to that of its foot 12.
  • the conferred assembly is of the dovetail type, or also called "fir fastener”.
  • the fan 1 comprises a shim 20 interposed between the lower end of the blade root 12, and a bottom 8a of the cell associated with the blade concerned.
  • the wedge 20 makes it possible to block the blade 10 in the radial inward direction, and also contributes to the plating of the bearing surfaces of the foot 12 against the energy end of the teeth 6.
  • the shim 20 comprises an abutment 22 for axial retention of its associated blade, this abutment 22 being intended to bear against a retention ring (not shown) carried by the disk 2 and centered on axis 4.
  • the shim 20 conventionally has a metal frame 24 around which is placed one or more outer elements 26 made of elastomeric material, this element 26 being in contact with the bottom 8a of the cell and the radially inner end of the foot 12 of dawn.
  • each element 26 is made by injection molding on the metal reinforcement, which is preferably made of titanium.
  • the overmolding process used is such as to cause the outer element 26 of elastomeric material to adhere to a support surface provided on the reinforcement 24.
  • outer member 26 also referred to as a delamination problem. Indeed, this problem arises essentially when the wedge 20 is inserted between the foot 12 and the bottom of the cell 8a during engine assembly and / or during handling operations requiring such a wedge introduction. As shown schematically in Figure 1, it is noted that the introduction of the wedge in its dedicated space is effected by sliding it along its longitudinal direction 30, generally slightly curvilinear.
  • the blade retention properties associated with this wedge may no longer be satisfied.
  • the wedge also having a vibration reduction function within the blade, its deterioration leads to lowering the vibration damping level experienced by the fan blade in operation.
  • the object of the invention is therefore to remedy at least partially the disadvantages mentioned above relating to the embodiments of the prior art.
  • the subject of the invention is preferably Preferably, the wedge takes the form of a band extending in a longitudinal direction, said corrugated zone having a plurality of waves succeeding that the same direction.
  • the waves thus arranged make it possible to withstand the delamination of the outer element made of elastomer material even more effectively when the wedge is introduced between the blade root and the cell bottom. Indeed, these waves then constitute direct obstacles to the relative displacement between the frame and the outer element of the hold, in the longitudinal direction, which usually corresponds to the direction of introduction of the hold in its dedicated space under the dawn.
  • the outer element of elastomeric material is overmolded on the metal reinforcement, preferably by injection under pressure.
  • the metal reinforcement is made of titanium.
  • the invention also relates to a turbojet fan comprising a plurality of fan blades and a disk defining at its periphery a plurality of cells, the foot of each fan blade being housed in one of the cells, and a shim as described above being interposed between the bottom of the cell and said foot.
  • each shim travels along the foot of its associated fan blade.
  • each shim has an axial retention stop of its associated fan blade.
  • the invention also relates to an aircraft turbojet engine comprising a fan as described above.
  • Figure 2 shows a partial cross-sectional view of the blower shown in Figure 1;
  • FIG. 3 represents a perspective view of a turbojet fan shim, according to a preferred embodiment of the present invention
  • FIG. 4 shows a view similar to that of FIG. 3, in which the elastomeric material outer element has been removed in order to show only the metal reinforcement and its support surface of the outer element
  • - Figure 4a shows a sectional view taken along the plane P of Figure 4a, integrating the longitudinal direction of the shim, and showing the corrugated areas of the support surface formed by the metal frame.
  • a shim 120 according to a preferred embodiment of the present invention.
  • This shim whose outer shape is substantially identical or similar to that of the wedge 20 of the prior art described in Figures 1 and 2, also has a general shape of strip extending on a longitudinal direction 130 of substantially curvilinear shape, corresponding to the direction in which also extends the foot 12 of its associated blade and the bottom of cell 8a.
  • the wedge 120 is intended to be introduced between the blade 10 and the bottom 8a of the cell 8 shown in FIG. 1, again for purposes of retention of the blade as well as damping. vibrations suffered by it.
  • the metal armature 124 preferably made of titanium, is equipped with an outer element of elastomeric material referenced 126, which partially covers the outer surface of this frame.
  • the outer element 126 made by overmolding by pressure injection of elastomeric material on the armature 124, leaves free a portion of the outer surface of this armature.
  • FIG. 4 this same armature 124 is shown in a state in which it is not yet covered by its outer element 126. This makes it possible to reveal the support surface 134 of this external element, which, as is visible in FIGS. 4 and 4a, has several corrugated zones 136.
  • Each corrugated zone 136 is in fact formed from a succession of waves 140 between which there are rounded depressions 142. Thus, during the overmolding by injection of the elastomeric material , this last penetrates the hollows 142, which has the double consequence of increasing the adhesion surface of the element 126 on the armature 124, and to create a plurality of mechanical engagement of the waves of the armature in the recesses of the outer element, and vice versa. In this regard, to further reduce the risk of delamination of the element 126, it is expected that the waves 140 of each corrugated zone 136 follow one another in the longitudinal direction 130 in which the wedge 120 is usually moved relative to the disk 2, so as to be interposed between the blade root 12 and the cell bottom 8a.
  • two corrugated zones 136 oriented in opposite directions are provided here, one of which may optionally be interrupted at one or more points by a portion of the armature 124 intended to form part of the outer surface of the finished block.
  • the two corrugated zones 136 are interconnected by a radially outer zone 146 and a radially internal zone (not visible in FIG. 4), these two zones being preferably flat and parallel to the direction 130.
  • the shim 120 here also has a stop 122 for axial retention of its associated fan blade, having the same geometry as the stop 22 shown on the shim 20 of FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Gasket Seals (AREA)

Abstract

The present invention relates to a block intended for being placed between the root of a jet-engine fan blade and the bottom of a cavity in which said root is housed, said cavity being delimited by a fan disk, said block having a metal frame (124) provided with at least one outer element made of an elastomer material, and having a supporting surface (134) for said outer element. According to the invention, the supporting surface (134) comprises at least one corrugated area (136).

Description

CALE D'AUBE DE SOUFFLANTE RENFORCEE REINFORCED BLOW OF BREATHING BLADE

DESCRIPTIONDESCRIPTION

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention se rapporte de façon générale au domaine des soufflantes de turboréacteur pour aéronef, et plus particulièrement à celui des cales destinées à être interposées entre le pied des aubes de soufflante, et le fond des alvéoles définies par le disque de soufflante.The present invention relates generally to the field of aircraft turbojet blowers, and more particularly to the shims intended to be interposed between the foot of the fan blades, and the bottom of the cells defined by the fan disk.

ÉTAT DE LA TECHNIQUE ANTÉRIEURESTATE OF THE PRIOR ART

Une telle soufflante de turboréacteur est représentée de façon éclatée sur la figure 1. Elle comprend globalement un disque 2 centré sur l'axe 4 de la soufflante, disque à la périphérie duquel sont pratiquées des dents 6 espacées circonférentiellement les unes des autres, et s' étendant chacune sensiblement longitudinalement et radialement, à savoir sensiblement parallèlement à l'axe 4. Entre deux dents 6 directement consécutives dans la direction circonférentielle, celles-ci délimitent une alvéole 8 destinée à recevoir le pied 12 d'une aube de soufflante 10. De façon connue, chaque dent dispose d'une tête élargie de manière à pouvoir assurer la rétention des aubes dans la direction radiale vers l'extérieur. En d'autres termes, l'alvéole 8 présente une extrémité radiale externe rétrécie permettant le passage de l'échasse de l'aube 10, de section rétrécie par rapport à celle de son pied 12. Ainsi, l'assemblage conféré est du type queue d'aronde, ou encore dit « attache sapin ».Such a turbojet fan is shown in an exploded manner in FIG. 1. It generally comprises a disk 2 centered on the axis 4 of the fan, a disk on the periphery of which are teeth 6 circumferentially spaced apart from each other, and extending each substantially longitudinally and radially, namely substantially parallel to the axis 4. Between two directly consecutive teeth 6 in the circumferential direction, these define a cell 8 intended to receive the foot 12 of a fan blade 10. In known manner, each tooth has an enlarged head so as to ensure the retention of the blades in the radial direction to the outside. In other words, the cell 8 has a narrowed external radial end allowing the stamina of the blade 10 to pass, with a narrowed section compared to that of its foot 12. Thus, the conferred assembly is of the dovetail type, or also called "fir fastener".

En outre, associée à chaque aube 10, la soufflante 1 comprend une cale 20 interposée entre l'extrémité inférieure du pied d'aube 12, et un fond 8a de l'alvéole associée à l'aube concernée.In addition, associated with each blade 10, the fan 1 comprises a shim 20 interposed between the lower end of the blade root 12, and a bottom 8a of the cell associated with the blade concerned.

Comme cela est le mieux visible sur la figure 2, la cale 20 permet de bloquer l'aube 10 dans la direction radiale vers l'intérieur, et participe également au plaquage des portées du pied 12 contre l'extrémité énergie des dents 6. En outre, comme visible sur la figure 1, la cale 20 comprend une butée 22 de rétention axiale de son aube associée, cette butée 22 étant destinée à être en appui contre un anneau de rétention (non représenté) porté par le disque 2 et centré sur l'axe 4.As best seen in FIG. 2, the wedge 20 makes it possible to block the blade 10 in the radial inward direction, and also contributes to the plating of the bearing surfaces of the foot 12 against the energy end of the teeth 6. furthermore, as can be seen in FIG. 1, the shim 20 comprises an abutment 22 for axial retention of its associated blade, this abutment 22 being intended to bear against a retention ring (not shown) carried by the disk 2 and centered on axis 4.

La cale 20 présente classiquement une armature métallique 24 autour de laquelle est placé un ou plusieurs éléments extérieurs 26 en matériau élastomère, cet élément 26 se trouvant donc au contact du fond 8a de l'alvéole et de l'extrémité radialement interne du pied 12 de l'aube. De façon connue, chaque élément 26 est réalisé par surmoulage par injection sur l'armature métallique, qui est de préférence réalisée en titane. Le procédé de surmoulage mis en œuvre est tel qu'il engendre une adhésion de l'élément extérieur 26 en matériau élastomère sur une surface de support prévue sur l'armature 24.The shim 20 conventionally has a metal frame 24 around which is placed one or more outer elements 26 made of elastomeric material, this element 26 being in contact with the bottom 8a of the cell and the radially inner end of the foot 12 of dawn. In known manner, each element 26 is made by injection molding on the metal reinforcement, which is preferably made of titanium. The overmolding process used is such as to cause the outer element 26 of elastomeric material to adhere to a support surface provided on the reinforcement 24.

Bien que cette solution technologique soit très répandue sur les turboréacteurs, elle est susceptible de provoquer des problèmes de décollement de l'élément extérieur 26, également dénommé problème de délaminage. En effet, ce problème se pose essentiellement lorsque la cale 20 est introduite entre le pied 12 et le fond de l'alvéole 8a, durant le montage du moteur et/ou lors des opérations de manutention nécessitant une telle introduction de cale. Comme cela a été schématisé sur la figure 1, il est noté que l'introduction de la cale dans son espace dédié s'effectue en la faisant coulisser le long de sa direction longitudinale 30, généralement légèrement curviligne .Although this technological solution is widespread on turbojet engines, it is likely to cause separation problems. outer member 26, also referred to as a delamination problem. Indeed, this problem arises essentially when the wedge 20 is inserted between the foot 12 and the bottom of the cell 8a during engine assembly and / or during handling operations requiring such a wedge introduction. As shown schematically in Figure 1, it is noted that the introduction of the wedge in its dedicated space is effected by sliding it along its longitudinal direction 30, generally slightly curvilinear.

Lorsqu'un tel arrachement se produit, les propriétés de rétention d'aube associées à cette cale peuvent ne plus être satisfaites. En outre, la cale disposant également d'une fonction de réduction des vibrations au sein de l'aube, sa détérioration conduit à baisser le niveau d'amortissement des vibrations subies par cette aube de soufflante en fonctionnement.When such tearing occurs, the blade retention properties associated with this wedge may no longer be satisfied. In addition, the wedge also having a vibration reduction function within the blade, its deterioration leads to lowering the vibration damping level experienced by the fan blade in operation.

EXPOSÉ DE L' INVENTION L'invention a donc pour but de remédier au moins partiellement aux inconvénients mentionnés ci- dessus relatifs aux réalisations de l'art antérieur.DISCLOSURE OF THE INVENTION The object of the invention is therefore to remedy at least partially the disadvantages mentioned above relating to the embodiments of the prior art.

Pour ce faire, l'invention a tout d'abord pour objet Préférentiellement , la cale prend la forme d'une bande s' étendant selon une direction longitudinale, ladite zone ondulée présentant une pluralité de vagues se succédant cela cette même direction. Les vagues ainsi disposées permettent de résister encore mieux au délaminage de l'élément extérieur en matériau élastomère, lorsque la cale est introduite entre le pied d'aube et le fond d'alvéole. En effet, ces vagues constituent alors des obstacles directs au déplacement relatifs entre l'armature et l'élément extérieur de la cale, selon la direction longitudinale, qui correspond habituellement à la direction d' introduction de la cale dans son espace dédié sous l'aube.To do this, the subject of the invention is preferably Preferably, the wedge takes the form of a band extending in a longitudinal direction, said corrugated zone having a plurality of waves succeeding that the same direction. The waves thus arranged make it possible to withstand the delamination of the outer element made of elastomer material even more effectively when the wedge is introduced between the blade root and the cell bottom. Indeed, these waves then constitute direct obstacles to the relative displacement between the frame and the outer element of the hold, in the longitudinal direction, which usually corresponds to the direction of introduction of the hold in its dedicated space under the dawn.

De préférence, l'élément extérieur en matériau élastomère est surmoulé sur l'armature métallique, préférentiellement par injection sous pression .Preferably, the outer element of elastomeric material is overmolded on the metal reinforcement, preferably by injection under pressure.

De préférence, l'armature métallique est réalisée en titane.Preferably, the metal reinforcement is made of titanium.

L' invention a également pour objet une soufflante de turboréacteur comprenant une pluralité d'aubes de soufflante ainsi qu'un disque définissant à sa périphérie une pluralité d'alvéoles, le pied de chaque aube de soufflante étant logé dans l'une des alvéoles, et une cale telle que décrite ci-dessus étant interposée entre le fond de l'alvéole et ledit pied.The invention also relates to a turbojet fan comprising a plurality of fan blades and a disk defining at its periphery a plurality of cells, the foot of each fan blade being housed in one of the cells, and a shim as described above being interposed between the bottom of the cell and said foot.

De préférence, chaque cale chemine le long du pied de son aube de soufflante associée.Preferably, each shim travels along the foot of its associated fan blade.

De préférence, chaque cale présente une butée de rétention axiale de son aube de soufflante associée.Preferably, each shim has an axial retention stop of its associated fan blade.

Enfin, l'invention a également pour objet un turboréacteur d' aéronef comprenant une soufflante telle que décrite ci-dessus.Finally, the invention also relates to an aircraft turbojet engine comprising a fan as described above.

D'autres avantages et caractéristiques de l'invention apparaîtront dans la description détaillée non limitative ci-dessous. BREVE DESCRIPTION DES DESSINSOther advantages and features of the invention will become apparent in the detailed non-limiting description below. BRIEF DESCRIPTION OF THE DRAWINGS

Cette description sera faite au regard des dessins annexés, parmi lesquels ;This description will be made with reference to the appended drawings, among which;

- la figure 1, déjà décrite, représente une vue éclatée en perspective d'une partie d'une soufflante de turboréacteur pour aéronef, de conception connue de l'art antérieur ;- Figure 1, already described, shows an exploded perspective view of a portion of an aircraft jet engine fan, of known design of the prior art;

La figure 2, également décrite précédemment, représente une vue partielle en section transversale de la soufflante montrée sur la figure 1 ;Figure 2, also described above, shows a partial cross-sectional view of the blower shown in Figure 1;

La figure 3 représente une vue en perspective d'une cale pour soufflante de turboréacteur, selon un mode de réalisation préféré de la présente invention ; - la figure 4 représente une vue similaire à celle de la figure 3, sur laquelle l'élément extérieur en matériau élastomère a été retiré afin de montrer uniquement l'armature métallique et sa surface de support de l'élément extérieur ; et - la figure 4a représente une vue en coupe prise selon le plan P de la figure 4a, intégrant la direction longitudinale de la cale, et montrant les zones ondulées de la surface de support formée par l'armature métallique. EXPOSÉ DÉTAILLÉ DE MODES DE RÉALISATION PARTICULIERSFIG. 3 represents a perspective view of a turbojet fan shim, according to a preferred embodiment of the present invention; FIG. 4 shows a view similar to that of FIG. 3, in which the elastomeric material outer element has been removed in order to show only the metal reinforcement and its support surface of the outer element; and - Figure 4a shows a sectional view taken along the plane P of Figure 4a, integrating the longitudinal direction of the shim, and showing the corrugated areas of the support surface formed by the metal frame. DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS

En référence à la figure 3, on peut donc apercevoir une cale 120 selon un mode de réalisation préféré de la présente invention. Cette cale, dont la forme extérieure est sensiblement identique ou similaire à celle de la cale 20 de l'art antérieur décrite sur les figures 1 et 2, présente également une forme générale de bande s' étendant sur une direction longitudinale 130, de forme sensiblement curviligne, correspondant à la direction selon laquelle s'étend également le pied 12 de son aube associée ainsi que le fond d'alvéole 8a. Ainsi, il est à comprendre que la cale 120 est destinée à être introduite entre l'aube 10 et le fond 8a de l'alvéole 8 montrée sur la figure 1, toujours à des fins de rétention de l'aube ainsi que d'amortissement des vibrations subies par celle-ci.With reference to FIG. 3, it is therefore possible to see a shim 120 according to a preferred embodiment of the present invention. This shim, whose outer shape is substantially identical or similar to that of the wedge 20 of the prior art described in Figures 1 and 2, also has a general shape of strip extending on a longitudinal direction 130 of substantially curvilinear shape, corresponding to the direction in which also extends the foot 12 of its associated blade and the bottom of cell 8a. Thus, it should be understood that the wedge 120 is intended to be introduced between the blade 10 and the bottom 8a of the cell 8 shown in FIG. 1, again for purposes of retention of the blade as well as damping. vibrations suffered by it.

Sur la figure 3, on peut apercevoir que l'armature métallique 124, de préférence en titane, est équipée d'un élément extérieur en matériau élastomère référencé 126, qui recouvre partiellement la surface extérieure de cette armature. En d'autres termes, l'élément extérieur 126, réalisé par surmoulage par injection sous pression de matériau élastomère sur l'armature 124, laisse libre une partie de la surface extérieure de cette armature. Sur la figure 4, il est montré cette même armature 124 dans un état dans lequel elle n'est pas encore recouverte par son élément extérieur 126. Cela permet de faire apparaître la surface de support 134 de cet élément extérieur, qui, comme cela est visible sur les figures 4 et 4a, présente plusieurs zones ondulées 136. Chaque zone ondulée 136 est en fait formée à partir d'une succession de vagues 140 entre lesquelles se présentent des creux arrondis 142. Ainsi, lors du surmoulage par injection du matériau élastomère, ce dernier vient pénétrer dans les creux 142, ce qui a pour double conséquence d'augmenter la surface d'adhésion de l'élément 126 sur l'armature 124, et de créer une pluralité d'engagements mécaniques des vagues de l'armature dans les creux de l'élément extérieur, et inversement. A cet égard, pour diminuer encore davantage les risques de délaminage de l'élément 126, il est prévu que les vagues 140 de chaque zone ondulée 136 se succèdent selon la direction longitudinale 130 dans laquelle la cale 120 est habituellement déplacée relativement par rapport au disque 2, de manière à être interposée entre le pied d'aube 12 et le fond d'alvéole 8a. Comme cela est montré sur la figure 4, il est ici prévu deux zones ondulées 136 orientées dans des directions opposées, l'une d'elle pouvant éventuellement être interrompue, à un ou plusieurs endroits, par une portion de l'armature 124 destinée à constituer une partie de la surface extérieure de la cale finie. Une fois la cale mise en place dans son alvéole, les vagues 140 s'étendent, dans le sens de leur amplitude, selon la direction circonférentielle du disque de soufflante 2.In Figure 3, it can be seen that the metal armature 124, preferably made of titanium, is equipped with an outer element of elastomeric material referenced 126, which partially covers the outer surface of this frame. In other words, the outer element 126, made by overmolding by pressure injection of elastomeric material on the armature 124, leaves free a portion of the outer surface of this armature. In FIG. 4, this same armature 124 is shown in a state in which it is not yet covered by its outer element 126. This makes it possible to reveal the support surface 134 of this external element, which, as is visible in FIGS. 4 and 4a, has several corrugated zones 136. Each corrugated zone 136 is in fact formed from a succession of waves 140 between which there are rounded depressions 142. Thus, during the overmolding by injection of the elastomeric material , this last penetrates the hollows 142, which has the double consequence of increasing the adhesion surface of the element 126 on the armature 124, and to create a plurality of mechanical engagement of the waves of the armature in the recesses of the outer element, and vice versa. In this regard, to further reduce the risk of delamination of the element 126, it is expected that the waves 140 of each corrugated zone 136 follow one another in the longitudinal direction 130 in which the wedge 120 is usually moved relative to the disk 2, so as to be interposed between the blade root 12 and the cell bottom 8a. As shown in FIG. 4, two corrugated zones 136 oriented in opposite directions are provided here, one of which may optionally be interrupted at one or more points by a portion of the armature 124 intended to form part of the outer surface of the finished block. Once the wedge has been placed in its cavity, the waves 140 extend in the direction of their amplitude in the circumferential direction of the fan disk 2.

En outre, les deux zones ondulées 136 sont reliées entre elles par une zone radialement externe 146 et une zone radialement interne (non visible sur la figure 4), ces deux zones étant préférentiellement planes et parallèles à la direction 130. De plus, elles font partie intégrante de la surface de support 134 sur laquelle l'élément en matériau élastomère 126 est destiné à adhérer, une fois le surmoulage par injection réalisé. Bien entendu, la cale 120 présente ici également une butée 122 de rétention axiale de son aube de soufflante associée, présentant la même géométrie que la butée 22 montrée sur la cale 20 de la figure 1.In addition, the two corrugated zones 136 are interconnected by a radially outer zone 146 and a radially internal zone (not visible in FIG. 4), these two zones being preferably flat and parallel to the direction 130. integral part of the support surface 134 on which the element of elastomeric material 126 is intended to adhere, once injection molding overmoulding. Of course, the shim 120 here also has a stop 122 for axial retention of its associated fan blade, having the same geometry as the stop 22 shown on the shim 20 of FIG.

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

REVENDICATIONS 1. Cale (120) destinée à être interposée entre un pied d'aube de soufflante (12) de turboréacteur et un fond (8a) d'une alvéole (8) dans laquelle est logé ce pied, alvéole qui est délimitée par un disque de soufflante (2), ladite cale présentant une armature métallique (124) équipée d'au moins un élément extérieur (126) en matériau élastomère, ladite armature présentant une surface de support (134) dudit élément extérieur en matériau élastomère, caractérisée en ce que ladite surface de support (134) comporte au moins une zone ondulée (136) .1. Shim (120) intended to be interposed between a turbojet fan blade root (12) and a bottom (8a) of a cell (8) in which is housed this foot, a cell which is delimited by a disk blower (2), said wedge having a metal armature (124) equipped with at least one outer element (126) made of elastomeric material, said armature having a support surface (134) of said outer element made of elastomeric material, characterized in that said support surface (134) has at least one corrugated area (136). 2. Cale selon la revendication 1, caractérisée en ce que ladite surface de support (134) présente deux zones ondulées (136) orientées dans des directions opposées.2. Wedge according to claim 1, characterized in that said support surface (134) has two corrugated zones (136) oriented in opposite directions. 3. Cale selon la revendication 1 ou la revendication 2, caractérisée en ce qu'elle prend la forme d'une bande s' étendant selon une direction longitudinale (130), et en ce que ladite zone ondulée présente une pluralité de vagues (140) se succédant selon ladite direction longitudinale (130) .3. Wedge according to claim 1 or claim 2, characterized in that it takes the form of a band extending in a longitudinal direction (130), and in that said corrugated zone has a plurality of waves (140). ) succeeding in said longitudinal direction (130). 4. Cale selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit élément extérieur (126) est surmoulé sur l'armature métallique (124) . 4. Wedge according to any one of the preceding claims, characterized in that said outer member (126) is overmoulded on the metal frame (124). 5. Cale selon l'une quelconque des revendications précédentes, caractérisée en ce que l'armature métallique (124) est réalisée en titane.5. Wedge according to any one of the preceding claims, characterized in that the metal armature (124) is made of titanium. 6. Soufflante (1) de turboréacteur comprenant une pluralité d'aubes de soufflante (10) ainsi qu'un disque (2) définissant à sa périphérie une pluralité d'alvéoles (8), le pied (12) de chaque aube de soufflante (10) étant logé dans l'une des alvéoles (8) et une cale (120) selon l'une quelconque des revendications précédentes étant interposée entre le fond (8a) de l'alvéole et ledit pied (12) .6. Blower (1) of a turbojet comprising a plurality of fan blades (10) and a disc (2) defining at its periphery a plurality of cells (8), the foot (12) of each blade of a fan (10) being housed in one of the cells (8) and a shim (120) according to any one of the preceding claims being interposed between the bottom (8a) of the cell and said foot (12). 7. Soufflante selon la revendication 6, caractérisée en ce que chaque cale (120) chemine le long du pied (12) de son aube de soufflante associée (10) .7. Blower according to claim 6, characterized in that each shim (120) runs along the foot (12) of its associated fan blade (10). 8. Soufflante selon la revendication 6 ou la revendication 7, caractérisée en ce que chaque cale8. Blower according to claim 6 or claim 7, characterized in that each shim (120) présente une butée (122) de rétention axiale de son aube de soufflante associée.(120) has a stop (122) axial retention of its associated fan blade. 9. Turboréacteur d'aéronef comprenant une soufflante (1) selon l'une quelconque des revendications 6 à 8. 9. Aircraft turbojet engine comprising a blower (1) according to any one of claims 6 to 8.
EP10718553.0A 2009-04-29 2010-04-28 Fan blade retainer with an elastomer Active EP2425100B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0952812A FR2945074B1 (en) 2009-04-29 2009-04-29 REINFORCED BLOW OF BREATHING BLADE
PCT/EP2010/055689 WO2010125089A1 (en) 2009-04-29 2010-04-28 Strengthened fan-blade block

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EP2425100A1 true EP2425100A1 (en) 2012-03-07
EP2425100B1 EP2425100B1 (en) 2015-02-18

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JP (1) JP5699131B2 (en)
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CN102414397B (en) 2015-02-18
US8870545B2 (en) 2014-10-28
WO2010125089A1 (en) 2010-11-04
CA2760290A1 (en) 2010-11-04
RU2526607C2 (en) 2014-08-27
FR2945074B1 (en) 2011-06-03
CA2760290C (en) 2017-03-07
FR2945074A1 (en) 2010-11-05
EP2425100B1 (en) 2015-02-18
BRPI1013981A2 (en) 2016-04-05
JP2012525530A (en) 2012-10-22
BRPI1013981B1 (en) 2020-06-23
RU2011148428A (en) 2013-06-10
CN102414397A (en) 2012-04-11
JP5699131B2 (en) 2015-04-08
US20120107125A1 (en) 2012-05-03

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