EP1114916B1 - Device for the axial retention of blades in a rim - Google Patents

Device for the axial retention of blades in a rim Download PDF

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Publication number
EP1114916B1
EP1114916B1 EP01400007A EP01400007A EP1114916B1 EP 1114916 B1 EP1114916 B1 EP 1114916B1 EP 01400007 A EP01400007 A EP 01400007A EP 01400007 A EP01400007 A EP 01400007A EP 1114916 B1 EP1114916 B1 EP 1114916B1
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EP
European Patent Office
Prior art keywords
blade
disc
wedging
retaining
arrangement according
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.)
Expired - Lifetime
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EP01400007A
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German (de)
French (fr)
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EP1114916A1 (en
EP1114916B8 (en
Inventor
Michel Antoine Brioude
Charles Jean Pierre Douguet
Jack Pierre Lauvergnat
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Safran Aircraft Engines SAS
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SNECMA Moteurs SA
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Publication of EP1114916A1 publication Critical patent/EP1114916A1/en
Publication of EP1114916B1 publication Critical patent/EP1114916B1/en
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Publication of EP1114916B8 publication Critical patent/EP1114916B8/en
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    • 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
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/04—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to undesired position of rotor relative to stator or to breaking-off of a part of the rotor, e.g. indicating such position
    • F01D21/045—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to undesired position of rotor relative to stator or to breaking-off of a part of the rotor, e.g. indicating such position special arrangements in stators or in rotors dealing with breaking-off of part of rotor

Definitions

  • the subject of this invention is a axial blade retainer arrangement in a turbomachine disk, which we can especially use in blowers to the entrance of these.
  • US-A-3556 675 shows an example of padlocking of blade roots in a disc by means of chocks and rings fixed on the disc.
  • the wedging pieces form a set relatively flexible which is exploited here possibilities of deformation by allowing the dawn of move in the groove up to a limit determined.
  • a relatively large energy is absorbed without excessive force being exerted on the dawn struck.
  • the deformation is reversible, that is to say that the parts of the rigging set come back to their original state after the shock, dawn is pushed back to its original position, other shocks may still be absorbed, and in particular others shocks after the initial shock can be absorbed in the same event.
  • This assembly elastic in the axial direction, sliding blade in an axial groove or slightly oblique differs from known arrangements, where dawn is is rigidly connected to the disk and deprived of any possibility of axial displacement, or restraint axially by a part likely to break or flambé in case of excessive axial force. Dawn undergoing shock will be likely to break easily in the first case, and the piece broken or having flamed will not be able to support other charges elevated during the same event in the second case.
  • Another aspect of the invention is that however, limits the deformation that the pieces of stalling are likely to suffer, so they do not keep of permanent deformations: a stop is added for that, between dawn and the disc. When the dawn shifting was enough to reach the stop position, the mechanical system becomes much more rigid, that is to say that much larger stress increases are necessary to produce displacements additional. The energy of the axial impact as well as the efforts are then shared between the two levels of the restraining arrangement of the stop system, and avoiding breaking one or the other of the systems.
  • the restraint of the first level is of a flexibility as it lets dawn slide in the alveolus of the disc without great axial effort before the second level does not intervene after a game imposed and, at that moment, retain dawn by including stiffness and ability of the arrangement.
  • the utility of the invention is not limited the absorption of shock forces consecutive to a next dawn break, but to all the causes axial forces on the blades, such as the impacts solid bodies, birds or others.
  • a general definition thereof is a dual-flexible retaining arrangement of a blade in a disk according to axial displacements of the blade, comprising a first level of deformation at significant flexibility and a second level of distortion marked by a disappearance of games enters at minus a chain of elements of the arrangement and by a decreased flexibility coupled with increasing burden elements of the chain, without breaking or buckling none of the elements of the chain.
  • the arrangement of holding a dawn in a disk where dawn can slide substantially axially in the disk includes wedges of the blade, and is characterized in that the wedging pieces are joined by pairs of thrust surfaces directed axially and ending either on a portion of the record or on a parts, which is connected to the disc, the pieces of wedging or the portion of the disc being at least partially flexible, and in that a determined game exists in the axial direction between either a portion of the disk be a portion of an attachment to the disk, and either a portion of the dawn, or a portion of a attachment at dawn, said game being consumed when a determined axial force was exerted on the dawn.
  • the arrangement can be on one side dawn, or both sides, the game being then advantageously on one side and the wedging parts of the other side.
  • Figure 1 shows some parts essential features of a turbomachine blower, one of which cone 1, a disc 2 covered by cone 1 and vanes 3 whose blades 4 come out of cone 1 and which include still feet 5 housed in grooves of the disk 2.
  • the dawn feet have a section bulbous, dovetailed, or swollen analogous in a groove of complementary shape, to interlock with it and to prohibit centrifugal movements of extraction of the blades 3 when the cone 1 rotates with the rotor of the turbomachine.
  • Figure 2 represents the front of the arrangement.
  • the dawn foot 5 is placed on a hold 7 which keeps it in place against the top of the groove by overflowing towards the front, where the hold 7 comes up against a ring of circumferential retention 8 which itself stumbles towards the front against a flange 9 of the disc 2.
  • the ring of circumferential retention has notches 25 of limited angular extension which receive the wedge ends 7 and prevent them from moving axially in the grooves 26, as is known.
  • a flange 10 covers the ring 8, the flange 9 and the shim 7 and is in the form of an envelope 11 pretty thin bolted to an outer portion 12 of the disc 2 via screws 13.
  • An important aspect of the invention lies in the pairs of abutment surfaces 27, 28 and 29 in look, surfaces respectively arranged on the foot 5 and the hold 7, on the hold 7 and the ring 8, and on the ring 8 and the flange 9; these surfaces are directed in the axial direction.
  • Disk 2 is bolted to a drum 14 which includes a flange 15 ending in a hood which covers the dawn foot 5 and the hold 7.
  • the drum 14 is provided with a flange 18 provided with notches 17 each of which comes to cap a tenon 19 of a rear portion 20 of the blade root 5, and a heel 21 of this rear portion 20 extends behind the flange 18, from which he is separated by a determined game in normal circumstances, where dawn does not undergo any effort axial axis. When this eventuality appears and as dawn moves forward, the game 22 gradually diminishes but remains parts 7, 8 and 9 begin to undergo deformation.
  • This conception of montage from dawn to two successive levels of rigidity can be set implemented by technical arrangements presenting a different appearance, as shown in Figure 4.
  • the foot dawn 5 is still lying on a wedge 7 climb into the same groove of the disc 2, and its position on the circumference can be provided by a similar piece to ring 8 but that is not represented here and does not participates more in the assembly of the invention.
  • a flask 30 covers at the front the hold 7 and the dawn foot 5; it is united to the disc 2 by bolts 31 and extends radially outward before curved hook-shaped 32 of angular extension limited which is located opposite the foot of blade 5; he includes, not far from the bolts 31, a thinned portion 33 which gives it extra flexibility.
  • the disc 2 comprises a flange 34 extending towards outside, with angular extension notches limited and finishing behind the hook 32 also notched between him and the flask itself.
  • the notches of the hook 32 and the flange 34 are extended by so that the solid parts of these two pieces are facing and separated in normal time from a game 35.

Description

Le sujet de cette invention est un agencement de retenue d'aubes en direction axiale dans un disque de turbomachine, qu'on pourra particulièrement employer dans les soufflantes à l'entrée de celles-ci.The subject of this invention is a axial blade retainer arrangement in a turbomachine disk, which we can especially use in blowers to the entrance of these.

On se préoccupe ici des situations d'avarie qui peuvent survenir quand une aube se rompt par un choc provoqué par l'entrée d'un corps étranger dans la machine ou lors d'une défaillance. L'aube se détachant heurte sa voisine et exerce des efforts axiaux et radiaux importants sur elle, qui peuvent la rompre à son tour. Le dispositif proposé ici permet d'absorber la composante axiale d'une force de choc s'exerçant sur l'aube. Il s'agit d'un agencement particulier faisant intervenir les pièces de calage de l'aube, situées entre le disque et un pied de l'aube coulissant dans une rainure et qui arrêtent son mouvement axial dans la rainure.We are concerned here about the damage situations that can occur when a dawn breaks by a shock caused by the entry of a foreign body into the machine or during a failure. Dawn standing out hitting her neighbor and exerting axial and important radials on it, which can break it at his turn. The device proposed here makes it possible to absorb the axial component of a shock force acting on dawn. This is a special arrangement intervene the wedges of the dawn, located between the disc and a dawn foot sliding in a groove and stop its axial movement in the groove.

US-A- 3556 675 montre un exemple de blocage de pieds d'aubes dans un disque au moyen de pièces de calage et d'anneaux fixés sur le disque.US-A-3556 675 shows an example of padlocking of blade roots in a disc by means of chocks and rings fixed on the disc.

Selon l'invention, les pièces de calage forment un ensemble relativement flexible dont on exploite ici les possibilités de déformation en permettant à l'aube de se déplacer dans la rainure jusqu'à une limite déterminée. Une énergie relativement importante est absorbée sans qu'une force excessive s'exerce sur l'aube heurtée. La déformation est réversible, c'est-à-dire que les pièces de l'ensemble de calage reviennent à leur état original après le choc, l'aube est repoussée à sa position initiale, d'autres chocs pourront encore être absorbés, et notamment d'autres chocs ultérieurs au choc initial peuvent être absorbés dans le même événement.According to the invention, the wedging pieces form a set relatively flexible which is exploited here possibilities of deformation by allowing the dawn of move in the groove up to a limit determined. A relatively large energy is absorbed without excessive force being exerted on the dawn struck. The deformation is reversible, that is to say that the parts of the rigging set come back to their original state after the shock, dawn is pushed back to its original position, other shocks may still be absorbed, and in particular others shocks after the initial shock can be absorbed in the same event.

Ce montage, élastique en direction axiale, d'aube coulissant dans une rainure axiale ou légèrement oblique diffère des agencements connus, où l'aube est soit reliée de façon rigide au disque et privée de toute possibilité de débattement axial, ou retenue axialement par une pièce susceptible de se rompre ou de flamber en cas de force axiale excessive. L'aube subissant le choc sera susceptible de se rompre facilement dans le premier cas, et la pièce rompue ou ayant flambé ne pourra pas supporter d'autres charges élevées au cours du même événement dans le second cas.This assembly, elastic in the axial direction, sliding blade in an axial groove or slightly oblique differs from known arrangements, where dawn is is rigidly connected to the disk and deprived of any possibility of axial displacement, or restraint axially by a part likely to break or flambé in case of excessive axial force. Dawn undergoing shock will be likely to break easily in the first case, and the piece broken or having flamed will not be able to support other charges elevated during the same event in the second case.

Un autre aspect de l'invention est qu'on limite toutefois la déformation que les pièces de calage risquent de subir, afin qu'elles ne gardent pas de déformations permanentes : une butée est ajoutée pour cela entre l'aube et le disque. Quand le déplacement de l'aube a été suffisant pour atteindre la position de butée, le système mécanique devient beaucoup plus rigide, c'est-à-dire que des accroissements d'effort beaucoup plus importants sont nécessaires pour produire des déplacements supplémentaires. L'énergie du choc axial ainsi que les efforts sont alors partagés entre les deux niveaux de l'agencement de retenue du système d'arrêt, et on évite la rupture de l'un ou l'autre des systèmes.Another aspect of the invention is that however, limits the deformation that the pieces of stalling are likely to suffer, so they do not keep of permanent deformations: a stop is added for that, between dawn and the disc. When the dawn shifting was enough to reach the stop position, the mechanical system becomes much more rigid, that is to say that much larger stress increases are necessary to produce displacements additional. The energy of the axial impact as well as the efforts are then shared between the two levels of the restraining arrangement of the stop system, and avoiding breaking one or the other of the systems.

La retenue du premier niveau est d'une souplesse telle qu'elle laisse l'aube coulisser dans l'alvéole du disque sans grand effort axial avant que le deuxième niveau n'intervienne au bout d'un jeu imposé et, à ce moment, retienne l'aube en incluant les raideurs et capacités de l'agencement.The restraint of the first level is of a flexibility as it lets dawn slide in the alveolus of the disc without great axial effort before the second level does not intervene after a game imposed and, at that moment, retain dawn by including stiffness and ability of the arrangement.

L'utilité de l'invention n'est pas limitée à l'absorption des forces de chocs consécutives à une rupture d'aube voisine, mais à toutes les causes d'efforts axiaux sur les aubes, telles que les impacts de corps solides, oiseaux ou autres.The utility of the invention is not limited the absorption of shock forces consecutive to a next dawn break, but to all the causes axial forces on the blades, such as the impacts solid bodies, birds or others.

On verra que de nombreuses variantes de réalisation, extérieurement différentes les unes des autres, sont possibles pour l'invention, mais une définition générale de celle-ci est un agencement de retenue à double souplesse d'une aube dans un disque selon des déplacements axiaux de l'aube, comprenant un premier niveau de déformation à souplesse importante et un deuxième niveau de déformation marqué par une disparition de jeux entre au moins une chaíne d'éléments de l'agencement et par une diminution de souplesse jointe à une charge croissante des éléments de la chaíne, sans rupture ni flambage d'aucun des éléments de la chaíne. Avantageusement, l'agencement de retenue d'une aube dans un disque où l'aube peut coulisser substantiellement axialement dans le disque, comprend des pièces de calage de l'aube, et est caractérisé en ce que les pièces de calage sont jointes par des paires de surfaces de butée dirigées axialement et finissant soit sur une portion du disque, soit sur une des pièces de calage, qui est unie au disque, les pièces de calage ou la portion du disque étant au moins partiellement flexibles, et en ce qu'un jeu déterminé existe en direction axiale entre soit une portion du disque soit une portion d'une pièce jointe au disque, et soit une portion de l'aube, soit une portion d'une pièce jointe à l'aube, ledit jeu étant consommé quand un effort axial déterminé a été exercé sur l'aube. We will see that many variants of realization, externally different from each other others, are possible for the invention, but a general definition thereof is a dual-flexible retaining arrangement of a blade in a disk according to axial displacements of the blade, comprising a first level of deformation at significant flexibility and a second level of distortion marked by a disappearance of games enters at minus a chain of elements of the arrangement and by a decreased flexibility coupled with increasing burden elements of the chain, without breaking or buckling none of the elements of the chain. Advantageously, the arrangement of holding a dawn in a disk where dawn can slide substantially axially in the disk, includes wedges of the blade, and is characterized in that the wedging pieces are joined by pairs of thrust surfaces directed axially and ending either on a portion of the record or on a parts, which is connected to the disc, the pieces of wedging or the portion of the disc being at least partially flexible, and in that a determined game exists in the axial direction between either a portion of the disk be a portion of an attachment to the disk, and either a portion of the dawn, or a portion of a attachment at dawn, said game being consumed when a determined axial force was exerted on the dawn.

L'agencement peut se trouver d'un seul côté de l'aube, ou des deux côtés, le jeu étant alors avantageusement d'un côté et les pièces de calage de l'autre côté.The arrangement can be on one side dawn, or both sides, the game being then advantageously on one side and the wedging parts of the other side.

Tout cela, ainsi que des aspects plus particuliers, apparaítra mieux à la description qui suit, en liaison aux dessins annexés et dont la liste est donnée ci-dessous :

  • La figure 1 est une vue générale d'une soufflante et montre un assemblage de fixation des aubes ;
  • Les figures 2 et 3 représentent pour un mode de réalisation de l'invention les deux extrémités de l'agencement de retenue des aubes ;
  • La figure 3A est une vue axiale d'un élément essentiel de la figure 3 ;
  • Et la figure 4 illustre un autre mode de réalisation de l'invention.
All this, as well as more specific aspects, will become more apparent from the following description, in conjunction with the accompanying drawings, the list of which is given below:
  • Figure 1 is a general view of a blower and shows a blade attachment assembly;
  • Figures 2 and 3 show for an embodiment of the invention the two ends of the blade retainer arrangement;
  • Figure 3A is an axial view of an essential element of Figure 3;
  • And Figure 4 illustrates another embodiment of the invention.

La figure 1 représente certaines parties essentielles d'une soufflante de turbomachine, dont un cône 1, un disque 2 couvert par le cône 1 et des aubes 3 dont les pales 4 sortent du cône 1 et qui comprennent encore des pieds 5 logés dans des rainures du disque 2. Ainsi qu'il est connu, les pieds d'aube ont une section en bulbe, en queue d'aronde ou renflée de façon analogue dans une rainure de forme complémentaire, de façon à s'imbriquer en elle et à interdire les mouvements centrifuges d'extraction des aubes 3 quand le cône 1 tourne avec le rotor de la turbomachine.Figure 1 shows some parts essential features of a turbomachine blower, one of which cone 1, a disc 2 covered by cone 1 and vanes 3 whose blades 4 come out of cone 1 and which include still feet 5 housed in grooves of the disk 2. As it is known, the dawn feet have a section bulbous, dovetailed, or swollen analogous in a groove of complementary shape, to interlock with it and to prohibit centrifugal movements of extraction of the blades 3 when the cone 1 rotates with the rotor of the turbomachine.

On se reporte maintenant plus précisément à la figure 2 qui représente l'avant de l'agencement. Le pied d'aube 5 est posé sur une cale 7 qui le maintient en place contre le haut de la rainure en débordant vers l'avant, où la cale 7 bute contre un anneau de rétention circonférencielle 8 qui lui-même bute vers l'avant contre une bride 9 du disque 2. L'anneau de rétention circonférentielle présente des crans 25 d'extension angulaire limitée qui reçoivent les extrémités des cales 7 et les empêchent de se déplacer axialement dans les rainures 26, ainsi qu'il est connu. De plus, un flasque 10 couvre l'anneau 8, la bride 9 et la cale 7 et se présente sous forme d'une enveloppe 11 assez mince boulonnée à une portion externe 12 du disque 2 par l'intermédiaire de vis 13.We are now referring more specifically to Figure 2 which represents the front of the arrangement. The dawn foot 5 is placed on a hold 7 which keeps it in place against the top of the groove by overflowing towards the front, where the hold 7 comes up against a ring of circumferential retention 8 which itself stumbles towards the front against a flange 9 of the disc 2. The ring of circumferential retention has notches 25 of limited angular extension which receive the wedge ends 7 and prevent them from moving axially in the grooves 26, as is known. In addition, a flange 10 covers the ring 8, the flange 9 and the shim 7 and is in the form of an envelope 11 pretty thin bolted to an outer portion 12 of the disc 2 via screws 13.

Un aspect important de l'invention réside dans les couples de surfaces de butée 27, 28 et 29 en regard, surfaces disposées respectivement sur le pied 5 et la cale 7, sur la cale 7 et l'anneau 8, et sur l'anneau 8 et la bride 9 ; ces surfaces sont dirigées en direction axiale.An important aspect of the invention lies in the pairs of abutment surfaces 27, 28 and 29 in look, surfaces respectively arranged on the foot 5 and the hold 7, on the hold 7 and the ring 8, and on the ring 8 and the flange 9; these surfaces are directed in the axial direction.

Quand le pied d'aube 5 est déplacé vers l'avant, il repousse la cale 7, puis l'anneau 8, jusqu'à ce que la bride 9 soit touchée, par un contact successif des surfaces des paires 27, 28 et 29. Mais cet empilement en direction axiale est assez souple à cause du nombre des pièces impliquées et de leurs possibilités de se déformer, surtout par la flexion et la torsion de l'anneau 8 dues à sa minceur et à un décalage radial des paires de surfaces de butée 28 et 29 entre lesquelles il est situé : un déplacement supplémentaire d'une valeur déterminée du pied d'aube 5 nécessitera donc d'exercer une certaine force, mais relativement faible dans un premier stade de la déformation. Un col 6 du disque 2, menant à la bride 9, fléchit aussi sous la charge et offre une souplesse supplémentaire.When the dawn foot 5 is moved to the front, he pushes the hold 7, then the ring 8, until the flange 9 is touched, by a contact successive surfaces of pairs 27, 28 and 29. But this stack in the axial direction is quite flexible to because of the number of parts involved and their opportunities to deform, especially by bending and the twisting of the ring 8 due to its thinness and to a radial offset of the pairs of abutment surfaces 28 and 29 between which it is located: a displacement additional value of the blade root 5 will therefore require some strength, but relatively low in a first stage of the deformation. A collar 6 of the disk 2, leading to the flange 9, also flexes under load and offers flexibility additional.

On passe maintenant à la figure 3, où est représenté l'autre côté du disque 2 et de l'aube 1.We now go to Figure 3, where is represented the other side of the disc 2 and the dawn 1.

Le disque 2 y est boulonné à un tambour 14 qui comprend une bride 15 finissant en un capot qui couvre le pied d'aube 5 et la cale 7. De plus, le tambour 14 est muni d'une bride 18 munie d'encoches 17 dont chacune d'elles vient coiffer un tenon 19 d'une portion arrière 20 du pied d'aube 5, et un talon 21 de cette portion arrière 20 s'étend derrière la bride 18, dont il est séparé par un jeu 22 déterminé dans des circonstances normales, où l'aube ne subit pas d'effort axial important. Quand cette éventualité apparaít et que l'aube se déplace vers l'avant, le jeu 22 s'amenuise progressivement mais subsiste alors que les pièces 7, 8 et 9 commencent à subir une déformation. Quand celle-ci atteint une certaine valeur, le jeu 22 est consommé et un contact direct s'instaure entre le talon 21 et la nervure 18 ; comme ces deux pièces sont beaucoup plus rigides que celles de l'avant de l'assemblage, des forces beaucoup plus importantes sont nécessaires pour déplacer encore l'aube vers l'avant, ce qui fait qu'on obtient un montage de l'aube faiblement rigide pour de petits déplacements mais fortement rigide pour des déplacements plus importants. Cette propriété permet d'absorber des énergies de choc assez importantes reçues par l'aube lors de cas de charges exceptionnelles comme l'ingestion d'oiseaux ou surtout la perte d'aube, sans risquer d'endommager les différentes pièces de l'agencement de retenue.Disk 2 is bolted to a drum 14 which includes a flange 15 ending in a hood which covers the dawn foot 5 and the hold 7. In addition, the drum 14 is provided with a flange 18 provided with notches 17 each of which comes to cap a tenon 19 of a rear portion 20 of the blade root 5, and a heel 21 of this rear portion 20 extends behind the flange 18, from which he is separated by a determined game in normal circumstances, where dawn does not undergo any effort axial axis. When this eventuality appears and as dawn moves forward, the game 22 gradually diminishes but remains parts 7, 8 and 9 begin to undergo deformation. When it reaches a certain value, the game 22 is consumed and direct contact is established between heel 21 and the rib 18; as these two pieces are much more rigid than those from the front of assembly, much larger forces are necessary to move the dawn further forward, so we get a montage of dawn weakly rigid for small movements but highly rigid for larger movements. This property absorbs shock energy large enough received by dawn in case of exceptional loads such as ingestion of birds or especially the loss of dawn, without the risk of damaging different parts of the retainer arrangement.

Cette conception du montage de l'aube à deux niveaux successifs de rigidité peut être mise en oeuvre par des agencements techniques présentant un aspect différent, comme le montre la figure 4. Le pied d'aube 5 est encore posé sur une cale 7 montée dans la même rainure du disque 2, et sa position sur la circonférence peut être assurée par une pièce analogue à l'anneau 8, mais qui n'est pas représentée ici et ne participe plus au montage de l'invention. Ici un flasque 30 couvre à l'avant la cale 7 et le pied d'aube 5 ; il est uni au disque 2 par des boulons 31 et s'étend radialement vers l'extérieur avant de se recourber en forme de crochet 32 d'extension angulaire limitée qui se situe en regard du pied d'aube 5 ; il comprend, non loin des boulons 31, une portion amincie 33 qui lui confère un surcroít de souplesse. De plus, le disque 2 comprend une bride 34 s'étendant vers l'extérieur, munie de crans d'extension angulaire limitée et finissant derrière le crochet 32 également cranté, entre lui et le flasque 30 proprement dit. Les crans du crochet 32 et de la bride 34 se prolongent de sorte que les parties pleines de ces deux pièces sont en regard et séparées en temps normal d'un jeu 35. This conception of montage from dawn to two successive levels of rigidity can be set implemented by technical arrangements presenting a different appearance, as shown in Figure 4. The foot dawn 5 is still lying on a wedge 7 climb into the same groove of the disc 2, and its position on the circumference can be provided by a similar piece to ring 8 but that is not represented here and does not participates more in the assembly of the invention. Here a flask 30 covers at the front the hold 7 and the dawn foot 5; it is united to the disc 2 by bolts 31 and extends radially outward before curved hook-shaped 32 of angular extension limited which is located opposite the foot of blade 5; he includes, not far from the bolts 31, a thinned portion 33 which gives it extra flexibility. Moreover, the disc 2 comprises a flange 34 extending towards outside, with angular extension notches limited and finishing behind the hook 32 also notched between him and the flask itself. The notches of the hook 32 and the flange 34 are extended by so that the solid parts of these two pieces are facing and separated in normal time from a game 35.

Dans cette conception, tous les éléments du montage à deux niveaux de rigidité se trouvent donc à l'avant des aubes, le jeu 35 ayant le rôle du jeu 22 précédent. Quand une aube subit une force vers l'avant, le pied d'aube 5 repousse la cale 7 en faisant fléchir le flasque 30 par la partie amincie 33, jusqu'à ce que le jeu 35 ait disparu et que le crochet 32 bute contre la bride 34 beaucoup plus rigide que le flasque 30, ce qui accroít fortement la résistance du montage aux déplacements supplémentaires de l'aube. La déformation des pièces de calage s'accomplit par la butée entre deux paires de surfaces 27 et 36, situées respectivement sur le pied 5 et la cale 7 (comme précédemment), et entre la cale 7 et le flasque 30.In this design, all elements of the mounting at two levels of rigidity are therefore at the front of the blades, the game 35 having the role of the game 22 previous. When a dawn is undergoing a force forward, the dawn foot 5 pushes hold 7 by bending the flange 30 by the thinned portion 33, until the game 35 is gone and the hook 32 is against the flange 34 much more rigid than the flange 30, this which greatly increases the resistance of the assembly to additional movements of dawn. Deformation wedges are accomplished by the stop between two pairs of surfaces 27 and 36, located respectively on foot 5 and hold 7 (as previously), and between the shim 7 and the flange 30.

Claims (10)

  1. Double-flexibility arrangement for retaining a blade in a disc (2) where the blade can slide substantially axially in the disc, comprising blade-wedging parts (7, 8), characterized in that the wedging parts are joined by pairs of abutment surfaces (27, 28, 29) directed axially and ending on a portion (9) of the disc, the wedging parts (7, 8) and the portion (9) of the disc being at least partially flexible and constituting a first level of deformation with significant flexibility, and in that there is a determined clearance (22) in the axial direction between a portion (18) of a piece (14, 15) joined to the disc (2) and a portion (21) of the blade, the said clearance being used up when a determined axial force has been exerted on the blade, the using-up of the said clearance constituting a second level of deformation.
  2. Retaining arrangement according to Claim 1, characterized in that the wedging pieces (7, 8) and the clearance (22) are situated on two opposite sides of the blade.
  3. Arrangement for retaining a blade in a disc (2) according to Claim 1, where the blade can slide substantially axially in the disc, comprising blade wedging pieces (7, 30), characterized in that the wedging pieces are joined by pairs of abutment surfaces (36) directed axially and finishing in one of the wedging pieces (30) which is connected to the disc (2), the wedging pieces being at least partially flexible, and in that there is a determined clearance (35) in the axial direction between a portion of the disc (34) and a portion (32) of a wedging piece (30), the said clearance being used up when a determined axial force has been exerted on the blade.
  4. Retaining arrangement according to Claim 3, characterized in that it lies entirely on one side of the blade.
  5. Retaining arrangement according to any one of Claims 1 to 4, characterized in that the wedging pieces comprise a wedge (7) slipped under a root (5) of the blade.
  6. Retaining arrangement according to Claim 5, characterized in that the wedging pieces comprise a retaining ring (8) for circumferentially retaining the wedge (7).
  7. Retaining arrangement according to Claim 6, characterized in that the ring (8) is arranged between two of the said pairs (28, 29) of abutment surfaces offset radially so as to be able to flex.
  8. Retaining arrangement according to Claim 3, characterized in that the wedging pieces comprise an endplate (30) which is connected to the disc (2).
  9. Retaining arrangement according to Claim 8, characterized in that the endplate (30) is provided with a thinner and flexible part (33).
  10. Retaining arrangement according to Claim 9, characterized in that the endplate (30) has an end bent into a hook shape (32) which acts as a rigid abutment when the clearance (35) is used up.
EP01400007A 2000-01-06 2001-01-04 Device for the axial retention of blades in a rim Expired - Lifetime EP1114916B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0000110A FR2803623B1 (en) 2000-01-06 2000-01-06 ARRANGEMENT FOR AXIAL RETENTION OF BLADES IN A DISC
FR0000110 2000-01-06

Publications (3)

Publication Number Publication Date
EP1114916A1 EP1114916A1 (en) 2001-07-11
EP1114916B1 true EP1114916B1 (en) 2005-08-24
EP1114916B8 EP1114916B8 (en) 2005-10-26

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EP01400007A Expired - Lifetime EP1114916B8 (en) 2000-01-06 2001-01-04 Device for the axial retention of blades in a rim

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US (1) US6595755B2 (en)
EP (1) EP1114916B8 (en)
JP (1) JP4153666B2 (en)
DE (1) DE60112820T2 (en)
FR (1) FR2803623B1 (en)

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Also Published As

Publication number Publication date
US20010007633A1 (en) 2001-07-12
DE60112820T2 (en) 2006-06-01
DE60112820D1 (en) 2005-09-29
JP2001234890A (en) 2001-08-31
US6595755B2 (en) 2003-07-22
EP1114916A1 (en) 2001-07-11
EP1114916B8 (en) 2005-10-26
FR2803623B1 (en) 2002-03-01
FR2803623A1 (en) 2001-07-13
JP4153666B2 (en) 2008-09-24

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