EP1498579B1 - Rotor disk comprising an annular flange - Google Patents

Rotor disk comprising an annular flange Download PDF

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Publication number
EP1498579B1
EP1498579B1 EP04291803.7A EP04291803A EP1498579B1 EP 1498579 B1 EP1498579 B1 EP 1498579B1 EP 04291803 A EP04291803 A EP 04291803A EP 1498579 B1 EP1498579 B1 EP 1498579B1
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EP
European Patent Office
Prior art keywords
collar
diameter
flange
ring
foot
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EP04291803.7A
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German (de)
French (fr)
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EP1498579A1 (en
Inventor
Kamel Benderradji
Marc Marchi
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Safran Aircraft Engines SAS
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SNECMA SAS
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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
    • 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
    • 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
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates
    • 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
    • F05D2250/00—Geometry
    • F05D2250/70—Shape
    • 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
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/501—Elasticity

Definitions

  • the invention relates to a device for retaining an annular flange against a radial face of a disk and rotor.
  • It relates more specifically to a device for retaining an annular flange against a radial face of a rotor disk, said disk having in said radial face an annular recess delimited by a plurality of walls, one of which is formed by the inner face of a flange.
  • said flange having, in its radially inner portion, an annular base bearing against the radially outer wall of the recess and a foot which extends radially inwards in the recess from the base, said device comprising a split annular retaining ring disposed in the recess, this ring having a first radial surface abutting against the inner face of the flange, a second radial surface abutting against the axially outer face foot and a peripheral surface abutting against said foot or said base.
  • the flange is provided to prevent the axial displacement of fir-tree type blades whose feet are mounted in axial slots provided at the periphery of the rotor disc.
  • the annular ring is firstly slotted in the recess of the disc, then it is compressed radially towards the inside of the recess by means of tools pressing on the peripheral wall of the ring until these tools come to press the flange of the disc. Then, the base of the flange is slid along the radially outer wall of the recess.
  • the ring has at its axially inner end a peripheral rabbet in which is housed the radially inner portion of the foot.
  • the outer diameter of the ring is smaller than the inside diameter of the base of the flange to allow the release of the compression tools during assembly and their introduction during a possible disassembly.
  • the diameter of the bore of the flange foot is greater than diameter of the flange to allow the introduction of the inner portion of the flange in the recess around the compression tools bearing against the periphery of the flange.
  • the flange being subjected to axial stresses during impacts on the blades as a result of the ingestion of debris, which are taken up by the retaining ring, shearing moments occur on the ring due to differences in diameter between the bore of the foot and the flange.
  • the manufacture of this ring requires expensive machining.
  • FR 2 812 906 has proposed a modified retaining ring which has at the periphery of its outer radial face a chamfer which allows the automatic compression of said ring during the passage of the foot of the flange during assembly.
  • This foot has notches to allow the introduction of compression tools of the ring for disassembly.
  • This ring is also massive and requires expensive machining.
  • the retaining ring remains in the recess during disassembly of the flange for repair or replacement of a blade for example.
  • This ring is thus different from a traditional circlip that is expanded by means of a piece for its establishment around a tree and which retracts elastically in a groove formed at the periphery of the shaft.
  • the object of the invention is to provide a system for axial retention of a rotor disc flange which is simple to produce and inexpensive and which facilitates the assembly of parts.
  • the ring is constituted by a rod interposed axially between the foot of the flange and the flange, and whose peripheral surface is in abutment against the base, said peripheral surface and said flange having in correspondence with notches opening outwardly and intended to receive compression tools of said rod which retract into the contour of the flange during assembly or disassembly of said flange.
  • the foot of the flange has a bore whose diameter is substantially equal to the diameter of the flange.
  • the radially inner portion of the ring is housed in a groove formed behind the flange.
  • This groove preferably has a U-shaped section and the ring has opposite planar radial faces.
  • the axial width of the groove is equal to or slightly greater than the thickness of the ring.
  • the drawings show a turbomachine disk 1 which comprises at its periphery a plurality of substantially axial cells 2 intended to receive blade roots 3 which extend radially outwards. These vanes are immobilized axially at least on one face 4 of the disk 1 by an annular flange 5 whose radially inner portion 6 is housed in an annular recess 7 formed in the face 4 and is immobilized therein by a retaining ring which, according to FIG. invention, is in the form of a snap ring 8.
  • the terms “inner” and “outer” mean a wall or surface respectively close to or distant from the axis of rotation of the disk, and the terms “inner” and “outer” refer to a wall or a surface respectively near or far from the median plane of disk 1.
  • the annular recess 7 is delimited radially on the outside by a substantially cylindrical wall 9 connected by a concave surface 10a an annular groove 12, of U-shaped section, disposed behind a flange 13 which extends radially outwards and of which the diameter is slightly greater than the diameter of the shoulder 14 formed by the concave surface 10 and the internal axial face of the groove 12.
  • the radially inner portion 6 of the flange 5 has a base 15 which extends into the recess 7 and which has a cylindrical peripheral surface 15a which bears against the cylindrical wall 9, and a foot 16 placed under the base 15 and which extends radially inwards.
  • the diameter of the bore 17 of the foot 16 is substantially equal to or slightly greater than the diameter of the flange 13, in order to allow the insertion of the radially inner portion 6 of the flange 5 into the recess 7 during assembly, or its extraction. for the purposes of repair or maintenance of the blades 3.
  • the outer face 18 of the foot 16 is disposed in a radial plane passing through the groove 12 in the vicinity of the shoulder 14. This face 18 is connected to the radially inner face of the the base 15, and forms with the latter a rabbet 19.
  • rabbet 19 houses the radially outer portion of the rod 8, the radially inner portion of which partially fits into the groove 12.
  • the ring 8 has two parallel axial faces perpendicular to the axis of rotation of the disk 1, namely an outer axial face 20 bearing against the inner face of the flange 13 and an inner axial face 21 bearing against the outer face 18 of the foot 16 and its peripheral surface 22 bears against the radially inner face of the base 15.
  • the rod 8 is retracted into the groove 12 by means of compression tools.
  • the flange 13 and the periphery of the ring 8 have correspondingly a plurality of notches 30a on the flange 13 and 30b on the rod 8, in which the claws 25 of the compression tools are positioned, these claws being dimensioned in such a way that when the ring 8 is retracted, the walls defining the pairs of notches 30a and 30b being aligned, the claws 25 retract into the diameter or the contour of the flange 13 and are then positioned in the geometric cylinder defined by the bore 17 of the foot 16.
  • the depth of the groove 7 is calculated to allow the retraction of the claws 25, during the compression of the rod 8.
  • the rod 8 Before placing the flange 5, the rod 8 is introduced into the recess 7, its radially inner portion preferably being in the groove 12, as shown in FIG. figure 3 .
  • the claws 25 of the compression tool are spread outward and are arranged in the notches 30b of the ring 8.
  • the claws 25 are brought towards the axis of rotation of the disc 1 by clamping, which compresses the ring 8 which retracts into the groove 7.
  • the flange 5 When the claws 25 bear against the notches 30a of the flange 13, as shown in FIG. figure 4 , the flange 5 is brought closer to the disc 1 and the foot 16 is passed over the flange 13, the ring 8 and the claws 25. The flange 5 is then pressed against the axial face 4, applying pressure to it. axial F then remove the claws 25, as shown by an arrow on the figure 5 . The ring 8 then expands and its periphery 22 bears against the base 15. The axial pressure F exerted on the flange 5 is suppressed, and the ring 8 is then compressed between the foot 16 and the flange 13, as well as that is shown on the figure 6 . Disassembly of the flange 5 is done by the reverse process.
  • the diameter of the shoulder 14 may be equal to the diameter of the flange 13. But advantageously, the diameter of the shoulder 14 is at most equal to the diameter of the bottom of the notches 30a of the flange 13. This arrangement allows the claws 25 of extend above the shoulder 14, during the compression of the rod 8 without impeding the mounting of the flange 5.
  • the inner diameter of the rod 8, which is not subject to stress, is preferably smaller than the diameter of the shoulder 14, so that the rod 8 is correctly positioned relative to the groove when the claws 25 are placed in the notches. 30b of the ring 8.
  • the rod 8 which is in the form of a split washer, is easy to manufacture and inexpensive.
  • the volume of the recess 7 can be limited to the maximum, which reinforces the periphery of the disc 1 which, in general, is subjected to considerable centrifugal forces.

Description

L'invention concerne un dispositif de rétention d'un flasque annulaire contre une face radiale d'un disque et rotor.The invention relates to a device for retaining an annular flange against a radial face of a disk and rotor.

Elle concerne plus précisément un dispositif pour retenir un flasque annulaire contre une face radiale d'un disque de rotor, ledit disque présentant dans ladite face radiale un évidement annulaire délimité par plusieurs parois dont l'une est formée par la face interne d'une bride qui s'étend radialement vers l'extérieur, et ledit flasque présentant, dans sa partie radialement intérieure, une base annulaire en appui contre la paroi radialement extérieure de l'évidement et un pied qui s'étend radialement vers l'intérieur dans l'évidement à partir de la base, ledit dispositif comportant une bague de retenue annulaire fendue disposée dans l'évidement, cette bague ayant une première surface radiale en butée contre la face interne de la bride, une deuxième surface radiale en butée contre la face axialement externe du pied et une surface périphérique en butée contre ledit pied ou ladite base.It relates more specifically to a device for retaining an annular flange against a radial face of a rotor disk, said disk having in said radial face an annular recess delimited by a plurality of walls, one of which is formed by the inner face of a flange. which extends radially outwards, and said flange having, in its radially inner portion, an annular base bearing against the radially outer wall of the recess and a foot which extends radially inwards in the recess from the base, said device comprising a split annular retaining ring disposed in the recess, this ring having a first radial surface abutting against the inner face of the flange, a second radial surface abutting against the axially outer face foot and a peripheral surface abutting against said foot or said base.

Un tel dispositif est connu par FR A 2 485 117 , équivalent à US 4 304 523 . Dans ce document, le flasque est prévu pour empêcher le déplacement axial d'aubes de type à attache sapin dont les pieds sont montés dans des encoches axiales prévues à la périphérie du disque de rotor. Pour monter le flasque, on dispose d'abord la bague annulaire fendue dans l'évidement du disque, puis on la comprime radialement vers l'intérieur de l'évidement au moyen d'outils appuyant sur la paroi périphérique de l'anneau jusqu'à ce que ces outils viennent appuyer sur la bride du disque. Ensuite, on fait coulisser la base du flasque le long de la paroi radialement extérieure de l'évidement.Such a device is known by FR A 2,485,117 , equivalent to US 4,304,523 . In this document, the flange is provided to prevent the axial displacement of fir-tree type blades whose feet are mounted in axial slots provided at the periphery of the rotor disc. To mount the flange, the annular ring is firstly slotted in the recess of the disc, then it is compressed radially towards the inside of the recess by means of tools pressing on the peripheral wall of the ring until these tools come to press the flange of the disc. Then, the base of the flange is slid along the radially outer wall of the recess.

On exerce une force axiale contre le flasque afin que le pied vienne en appui contre la paroi radiale interne de l'évidement. On relâche alors les outils qui comprimaient la bague annulaire. Cette dernière s'expanse radialement vers l'extérieur.An axial force is exerted against the flange so that the foot bears against the inner radial wall of the recess. Then release the tools that compressed the ring ring. The latter expands radially outwards.

Ensuite, on supprime la force axiale exercée sur le flasque. La bague présente à son extrémité axialement intérieure une feuillure périphérique dans laquelle vient loger la portion radialement intérieure du pied. Le diamètre extérieur de la bague est inférieur au diamètre intérieur de la base du flasque afin de permettre le dégagement des outils de compression lors du montage et leur introduction lors d'un démontage éventuel. Le diamètre de l'alésage du pied du flasque est supérieur au diamètre de la bride pour permettre l'introduction de la portion interne du flasque dans l'évidement autour des outils de compression en appui contre la périphérie de la bride.Then, the axial force exerted on the flange is eliminated. The ring has at its axially inner end a peripheral rabbet in which is housed the radially inner portion of the foot. The outer diameter of the ring is smaller than the inside diameter of the base of the flange to allow the release of the compression tools during assembly and their introduction during a possible disassembly. The diameter of the bore of the flange foot is greater than diameter of the flange to allow the introduction of the inner portion of the flange in the recess around the compression tools bearing against the periphery of the flange.

Le flasque étant soumis à des sollicitations axiales lors de chocs sur les aubes par suite de l'ingestion de débris, qui sont reprises par l'anneau de retenue, il se produit des couples de cisaillement sur la bague du fait des écarts de diamètre entre l'alésage du pied et la bride. Ceci exige que l'anneau de retenue soit massif, tout en étant suffisamment souple pour permettre sa compression et son installation dans l'évidement. La fabrication de cette bague nécessite un usinage coûteux.The flange being subjected to axial stresses during impacts on the blades as a result of the ingestion of debris, which are taken up by the retaining ring, shearing moments occur on the ring due to differences in diameter between the bore of the foot and the flange. This requires that the retaining ring is solid, while being flexible enough to allow compression and installation in the recess. The manufacture of this ring requires expensive machining.

FR 2 812 906 a proposé un anneau de retenue modifié qui présente à la périphérie de sa face radiale externe un chanfrein qui permet la compression automatique de ladite bague lors du passage du pied du flasque au cours du montage. Ce pied comporte des encoches pour permettre l'introduction d'outils de compression de la bague pour le démontage. Cette bague est également massive et nécessite un usinage coûteux. FR 2 812 906 has proposed a modified retaining ring which has at the periphery of its outer radial face a chamfer which allows the automatic compression of said ring during the passage of the foot of the flange during assembly. This foot has notches to allow the introduction of compression tools of the ring for disassembly. This ring is also massive and requires expensive machining.

Il est à noter que la bague de retenue reste dans l'évidement lors du démontage du flasque pour réparation ou remplacement d'une aube par exemple. Cette bague est ainsi différente d'un circlips traditionnel que l'on expanse au moyen d'une pièce pour sa mise en place autour d'un arbre et qui se rétracte élastiquement dans une gorge ménagée à la périphérie de l'arbre.It should be noted that the retaining ring remains in the recess during disassembly of the flange for repair or replacement of a blade for example. This ring is thus different from a traditional circlip that is expanded by means of a piece for its establishment around a tree and which retracts elastically in a groove formed at the periphery of the shaft.

Le but de l'invention est de proposer un système de rétention axial d'un flasque de disque de rotor qui soit simple à réaliser et peu coûteux et qui permette de faciliter le montage des pièces.The object of the invention is to provide a system for axial retention of a rotor disc flange which is simple to produce and inexpensive and which facilitates the assembly of parts.

L'invention atteint son but par le fait que la bague est constituée par un jonc interposé axialement entre le pied du flasque et la bride, et dont la surface périphérique est en butée contre la base, ladite surface périphérique et ladite bride comportant en correspondance des encoches débouchant vers l'extérieur et destinées à recevoir des outils de compression dudit jonc qui s'escamotent dans le contour de la bride lors du montage ou du démontage dudit flasque.The invention achieves its goal by the fact that the ring is constituted by a rod interposed axially between the foot of the flange and the flange, and whose peripheral surface is in abutment against the base, said peripheral surface and said flange having in correspondence with notches opening outwardly and intended to receive compression tools of said rod which retract into the contour of the flange during assembly or disassembly of said flange.

Le pied du flasque présente un alésage dont le diamètre est sensiblement égal au diamètre de la bride.The foot of the flange has a bore whose diameter is substantially equal to the diameter of the flange.

Très avantageusement, la portion radialement intérieure du jonc loge dans une rainure ménagée derrière la bride.Very advantageously, the radially inner portion of the ring is housed in a groove formed behind the flange.

Cette rainure a de préférence une section en U et le jonc présente des faces radiales opposées planes. La largeur axiale de la rainure est égale ou légèrement supérieure à l'épaisseur du jonc.This groove preferably has a U-shaped section and the ring has opposite planar radial faces. The axial width of the groove is equal to or slightly greater than the thickness of the ring.

D'autres avantages et caractéristiques de l'invention ressortiront à la lecture de la description suivante faite à titre d'exemple et en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue en perspective d'une partie d'un disque de rotor de turbomachine équipée d'un flasque de retenue d'aubes, ces aubes n'étant pas montrées sur cette figure par souci de clarté,
  • la figure 2 est une coupe selon un plan contenant l'axe de rotation du disque aubagé de la figure 1 ;
  • la figure 3 montre le positionnement du jonc avant la mise en place du flasque ; et
  • les figures 4 à 6 montrent les diverses étapes du montage du flasque.
Other advantages and characteristics of the invention will become apparent on reading the following description given by way of example and with reference to the appended drawings in which:
  • the figure 1 is a perspective view of a portion of a turbomachine rotor disk equipped with a blade retaining flange, these vanes not being shown in this figure for the sake of clarity,
  • the figure 2 is a section along a plane containing the axis of rotation of the blisk of the figure 1 ;
  • the figure 3 shows the positioning of the ring before the flange is put in place; and
  • the Figures 4 to 6 show the various stages of flange mounting.

Les dessins montrent un disque 1 de turbomachine qui comporte à sa périphérie une pluralité d'alvéoles 2 sensiblement axiales, destinées à recevoir des pieds d'aubes 3 qui s'étendent radialement vers l'extérieur. Ces aubes sont immobilisées axialement au moins sur une face 4 du disque 1 par un flasque annulaire 5 dont la portion 6 radialement intérieure loge dans un évidement annulaire 7 ménagé dans la face 4 et y est immobilisée par une bague de retenue qui, selon l'invention, se présente sous la forme d'un jonc 8 fendu.The drawings show a turbomachine disk 1 which comprises at its periphery a plurality of substantially axial cells 2 intended to receive blade roots 3 which extend radially outwards. These vanes are immobilized axially at least on one face 4 of the disk 1 by an annular flange 5 whose radially inner portion 6 is housed in an annular recess 7 formed in the face 4 and is immobilized therein by a retaining ring which, according to FIG. invention, is in the form of a snap ring 8.

Dans le présent mémoire, les termes "intérieur" et "extérieur" désignent une paroi ou une surface respectivement proche ou éloignée de l'axe de rotation du disque, et les termes "interne" et "externe" désignent une paroi ou une surface respectivement proche ou éloignée du plan médian du disque 1.As used herein, the terms "inner" and "outer" mean a wall or surface respectively close to or distant from the axis of rotation of the disk, and the terms "inner" and "outer" refer to a wall or a surface respectively near or far from the median plane of disk 1.

L'évidement annulaire 7 est délimité radialement à l'extérieur par une paroi 9 sensiblement cylindrique raccordée par une surface concave 10a une rainure annulaire 12, de section en U, disposée derrière une bride 13 qui s'étend radialement vers l'extérieur et dont le diamètre est légèrement supérieur au diamètre de l'épaulement 14 formé par la surface concave 10 et la face axiale interne de la rainure 12.The annular recess 7 is delimited radially on the outside by a substantially cylindrical wall 9 connected by a concave surface 10a an annular groove 12, of U-shaped section, disposed behind a flange 13 which extends radially outwards and of which the diameter is slightly greater than the diameter of the shoulder 14 formed by the concave surface 10 and the internal axial face of the groove 12.

Dans l'exemple montré sur les dessins, la rainure 12 et la bride 13 émergent sur la face 4 du disque 3, mais cette disposition n'est pas obligatoire pour la mise en oeuvre de l'invention.In the example shown in the drawings, the groove 12 and the flange 13 emerge on the face 4 of the disc 3, but this provision is not mandatory for the implementation of the invention.

La portion 6 radialement intérieure du flasque 5 présente une base 15 qui s'étend dans l'évidement 7 et qui présente une surface périphérique 15a cylindrique qui est en appui contre la paroi cylindrique 9, ainsi qu'un pied 16 disposé sous la base 15 et qui s'étend radialement vers l'intérieur. Le diamètre de l'alésage 17 du pied 16 est sensiblement égal ou légèrement supérieur au diamètre de la bride 13, afin de permettre l'introduction de la portion 6 radialement intérieure du flasque 5 dans l'évidement 7 lors du montage, ou son extraction pour des besoins de réparation ou d'entretien des aubes 3. La face 18 externe du pied 16 est disposée dans un plan radial passant dans la rainure 12 au voisinage de l'épaulement 14. Cette face 18 se raccorde à la face radialement intérieure de la base 15, et forme avec cette dernière une feuillure 19.The radially inner portion 6 of the flange 5 has a base 15 which extends into the recess 7 and which has a cylindrical peripheral surface 15a which bears against the cylindrical wall 9, and a foot 16 placed under the base 15 and which extends radially inwards. The diameter of the bore 17 of the foot 16 is substantially equal to or slightly greater than the diameter of the flange 13, in order to allow the insertion of the radially inner portion 6 of the flange 5 into the recess 7 during assembly, or its extraction. for the purposes of repair or maintenance of the blades 3. The outer face 18 of the foot 16 is disposed in a radial plane passing through the groove 12 in the vicinity of the shoulder 14. This face 18 is connected to the radially inner face of the the base 15, and forms with the latter a rabbet 19.

Dans cette feuillure 19 loge la portion radialement extérieure du jonc 8, dont la portion radialement intérieure loge en partie dans la rainure 12.In this rabbet 19 houses the radially outer portion of the rod 8, the radially inner portion of which partially fits into the groove 12.

Le jonc 8 présente deux faces axiales parallèles perpendiculaires à l'axe de rotation du disque 1, à savoir une face axiale externe 20 en appui contre la face interne de la bride 13 et une face axiale interne 21 en appui contre la face externe 18 du pied 16 et sa surface périphérique 22 est en appui contre la face radialement intérieure de la base 15.The ring 8 has two parallel axial faces perpendicular to the axis of rotation of the disk 1, namely an outer axial face 20 bearing against the inner face of the flange 13 and an inner axial face 21 bearing against the outer face 18 of the foot 16 and its peripheral surface 22 bears against the radially inner face of the base 15.

Pour permettre le montage ou le démontage du flasque 5, le jonc 8 est rétracté dans la rainure 12 au moyen d'outils de compression. Comme on le voit clairement sur la figure 1, la bride 13 et la périphérie du jonc 8 présentent en correspondance une pluralité d'encoches 30a sur la bride 13 et 30b sur le jonc 8, dans lesquelles on positionne les griffes 25 des outils de compression, ces griffes étant dimensionnées de telle manière que, lorsque le jonc 8 est rétracté, les paroi délimitant les paires d'encoches 30a et 30b étant alignées, les griffes 25 s'escamotent dans le diamètre ou le contour de la bride 13 et sont alors positionnées dans le cylindre géométrique défini par l'alésage 17 du pied 16.To allow the mounting or disassembly of the flange 5, the rod 8 is retracted into the groove 12 by means of compression tools. As we clearly see on the figure 1 , the flange 13 and the periphery of the ring 8 have correspondingly a plurality of notches 30a on the flange 13 and 30b on the rod 8, in which the claws 25 of the compression tools are positioned, these claws being dimensioned in such a way that when the ring 8 is retracted, the walls defining the pairs of notches 30a and 30b being aligned, the claws 25 retract into the diameter or the contour of the flange 13 and are then positioned in the geometric cylinder defined by the bore 17 of the foot 16.

La profondeur de la rainure 7 est calculée pour permettre l'escamotage des griffes 25, lors de la compression du jonc 8.The depth of the groove 7 is calculated to allow the retraction of the claws 25, during the compression of the rod 8.

Avant de mettre en place le flasque 5, on introduit le jonc 8 dans l'évidement 7, sa partie radialement intérieure étant de préférence dans la rainure 12, ainsi que cela est montré sur la figure 3. Les griffes 25 de l'outil de compression sont écartées vers l'extérieur et on les dispose dans les encoches 30b du jonc 8. On rapproche les griffes 25 vers l'axe de rotation du disque 1 par serrage, ce qui comprime le jonc 8 qui s'escamote dans la rainure 7.Before placing the flange 5, the rod 8 is introduced into the recess 7, its radially inner portion preferably being in the groove 12, as shown in FIG. figure 3 . The claws 25 of the compression tool are spread outward and are arranged in the notches 30b of the ring 8. The claws 25 are brought towards the axis of rotation of the disc 1 by clamping, which compresses the ring 8 which retracts into the groove 7.

Lorsque les griffes 25 sont en appui contre les encoches 30a de la bride 13, comme cela est montré sur la figure 4, on rapproche le flasque 5 du disque 1 et on fait passer le pied 16 au-dessus de la bride 13, du jonc 8 et des griffes 25. On plaque alors le flasque 5 contre la face axiale 4, en appliquant sur lui une pression axiale F puis on retire les griffes 25, comme cela est représenté par une flèche sur la figure 5. Le jonc 8 s'expanse alors et sa périphérie 22 vient en appui contre la base 15. On supprime la pression axiale F exercée sur le flasque 5, et le jonc 8 est alors comprimé entre le pied 16 et la bride 13, ainsi que cela est montré sur la figure 6. Le démontage du flasque 5 se fait selon le processus inverse.When the claws 25 bear against the notches 30a of the flange 13, as shown in FIG. figure 4 , the flange 5 is brought closer to the disc 1 and the foot 16 is passed over the flange 13, the ring 8 and the claws 25. The flange 5 is then pressed against the axial face 4, applying pressure to it. axial F then remove the claws 25, as shown by an arrow on the figure 5 . The ring 8 then expands and its periphery 22 bears against the base 15. The axial pressure F exerted on the flange 5 is suppressed, and the ring 8 is then compressed between the foot 16 and the flange 13, as well as that is shown on the figure 6 . Disassembly of the flange 5 is done by the reverse process.

Le diamètre de l'épaulement 14 peut être égal au diamètre de la bride 13. Mais avantageusement, le diamètre de l'épaulement 14 est au plus égal au diamètre du fond des encoches 30a de la bride 13. Cette disposition permet aux griffes 25 de s'étendre au-dessus de l'épaulement 14, lors de la compression du jonc 8 sans gêner le montage du flasque 5.The diameter of the shoulder 14 may be equal to the diameter of the flange 13. But advantageously, the diameter of the shoulder 14 is at most equal to the diameter of the bottom of the notches 30a of the flange 13. This arrangement allows the claws 25 of extend above the shoulder 14, during the compression of the rod 8 without impeding the mounting of the flange 5.

Le diamètre intérieur du jonc 8, non soumis à des contraintes, est de préférence inférieur au diamètre de l'épaulement 14, afin que le jonc 8 soit correctement positionné par rapport à la rainure lors de la mise en place des griffes 25 dans les encoches 30b du jonc 8.The inner diameter of the rod 8, which is not subject to stress, is preferably smaller than the diameter of the shoulder 14, so that the rod 8 is correctly positioned relative to the groove when the claws 25 are placed in the notches. 30b of the ring 8.

Lorsque la rainure 7 émerge sur la face 4 du disque 1, la mise en place du jonc 8 sur le disque 8 est plus aisée.When the groove 7 emerges on the face 4 of the disc 1, the establishment of the rod 8 on the disc 8 is easier.

Le jonc 8, qui se présente sous la forme d'une rondelle fendue, est facile à fabriquer et peu coûteux. En outre, le volume de l'évidement 7 peut être limité au maximum, ce qui renforce la périphérie du disque 1 qui, en général, est soumise à des forces centrifuges considérables.The rod 8, which is in the form of a split washer, is easy to manufacture and inexpensive. In addition, the volume of the recess 7 can be limited to the maximum, which reinforces the periphery of the disc 1 which, in general, is subjected to considerable centrifugal forces.

Claims (7)

  1. A rotor disk comprising a plurality of cells intended to receive blades, bearing an annular end plate (5) fixed against a radial face (4) of the rotor disc in order to retain said blaides, the said disc having in the said radial face an annular recess (7) delimited by a plurality of walls, one of which is formed by the inside face of a collar (13) extending radially outwards, and the said end plate (5) having, in its radially inner part, an annular base (15) bearing against the radially outer wall (9) of the recess (7) and a foot (16) extending radially inwards in the recess (7) from the base (15), a split annular retaining ring being disposed in the recess (7), this ring having a first radial surface bearing against the inside face of the collar, a second radial surface bearing against the axially outside face of the foot and a peripheral surface butting against the said foot or the said base,
    characterized in that the ring is constituted by a snap ring (8) interposed axially between the foot (16) of the end plate (5) and the collar (13) and the peripheral surface (22) of which butts against the base (15), in that the said peripheral surface (22) and the said collar (13) comprise corresponding notches (30a, 30b), which open radially outwards and are intended to receive compression tools (25) of the said snap ring (8), which tools retract substantially totally into the contour of the said collar (13) during the assembly or disassembly of the said end plate (5), and in that the foot (16) of the end plate (5) has a bore (17), the diameter of which is substantially equal to the diameter of the collar (13).
  2. Disk according to Claim 1, characterized in that the radially inner portion of the snap ring (8) is accommodated in a slot (12) made behind the collar (13).
  3. Disk according to Claim 2, characterized in that the slot (12) has a U-shaped section.
  4. Disk according to either of Claims 2 or 3, characterized in that the shoulder (14) formed by the slot (12) and the wall (10) of the cavity (7) has a diameter equal to or less than the diameter of the collar (13).
  5. Disk according to Claim 4, characterized in that the diameter of the shoulder (14) is equal to or less than the diameter of the bottom of the notches (30a) in the collar (13).
  6. Disk according to any one of Claims 2 to 5, characterized in that the snap ring (8) has flat, opposing radial faces and the thickness of the snap ring (8) is equal to or less than the width of the slot (12).
  7. Turboengine characterized in that it comprises a rotor disk according to any one of the preceding claims.
EP04291803.7A 2003-07-17 2004-07-15 Rotor disk comprising an annular flange Active EP1498579B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0308713 2003-07-17
FR0308713A FR2857691B1 (en) 2003-07-17 2003-07-17 RETENTION OF ROTOR FLASK

Publications (2)

Publication Number Publication Date
EP1498579A1 EP1498579A1 (en) 2005-01-19
EP1498579B1 true EP1498579B1 (en) 2015-12-02

Family

ID=33462547

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EP04291803.7A Active EP1498579B1 (en) 2003-07-17 2004-07-15 Rotor disk comprising an annular flange

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US (1) US7217100B2 (en)
EP (1) EP1498579B1 (en)
JP (1) JP4181528B2 (en)
CA (1) CA2475043C (en)
FR (1) FR2857691B1 (en)
RU (1) RU2340799C2 (en)
UA (1) UA82660C2 (en)

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FR2899636B1 (en) * 2006-04-10 2008-07-04 Snecma Sa AXIAL RETENTION DEVICE FOR A TURBOMACHINE ROTOR DISC FLASK
EP1956194A1 (en) * 2007-02-06 2008-08-13 Siemens Aktiengesellschaft Turbine assembly comprising a securing member and process of securing a side plate
FR2918106B1 (en) 2007-06-27 2011-05-06 Snecma AXIS RETAINING DEVICE OF AUBES MOUNTED ON A TURBOMACHINE ROTOR DISC.
EP2182170A1 (en) 2008-10-30 2010-05-05 Siemens Aktiengesellschaft Gas turbine with seal plates on the turbine disk
FR2939834B1 (en) 2008-12-17 2016-02-19 Turbomeca TURBINE WHEEL WITH AXIAL RETENTION SYSTEM OF AUBES
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Also Published As

Publication number Publication date
FR2857691A1 (en) 2005-01-21
CA2475043A1 (en) 2005-01-17
US20050042108A1 (en) 2005-02-24
RU2340799C2 (en) 2008-12-10
UA82660C2 (en) 2008-05-12
US7217100B2 (en) 2007-05-15
RU2004122000A (en) 2006-01-27
JP2005036811A (en) 2005-02-10
FR2857691B1 (en) 2006-02-03
CA2475043C (en) 2011-09-27
EP1498579A1 (en) 2005-01-19
JP4181528B2 (en) 2008-11-19

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