Turbine engine rotor lock

Abstract

A turbine engine rotor lock, in particular for a turbojet fan, adapted to retain a blade axially relative to a disk of the rotor, the lock including a composite body including a woven fiber structure embedded in a matrix; and a damper pad made of elastomer and fastened to the composite body.

Claims

1. A turbine engine rotor comprising: a disk; blades attached to the disk; a lock for the turbine engine rotor, the lock retaining at least one of the blades axially relative to the disk of the turbine engine rotor, the lock including: a composite body comprising a woven fiber structure embedded in a matrix, and a damper pad made of elastomer and fastened to the composite body, wherein the woven fiber structure comprises warp yarns and weft yarns oriented such that when the lock is in position on the turbine engine rotor, the warp yarns are oriented in a tangential direction of the turbine engine rotor and the weft yarns are oriented in a radial direction of the turbine engine rotor, or vice versa, wherein each blade is fastened in a slot of the disk by a blade root, wherein the lock is fastened to an axial end of the slot for said at least one of the blades, and wherein the damper pad is situated between the blade root of said at least one of the blades and the composite body.

2. The turbine engine rotor according to claim 1, wherein the woven fiber structure is made by three-dimensional weaving.

3. The turbine engine rotor according to claim 1, wherein a portion of the woven fiber structure, situated opposite the damper pad, forms a projecting tab oriented away from the damper pad.

4. The turbine engine rotor according to claim 1, wherein the matrix of the composite body is organic.

5. The turbine engine rotor according to claim 1, wherein the damper pad is fastened to the composite body by adhesive bonding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The accompanying drawings are diagrammatic, they are not to scale, and they seek above all to illustrate the principles of the invention.

(2) In the drawings, from one figure to another, elements (or portions of an element) that are identical are given the same reference signs.

(3) FIG. 1 is a fragmentary, exploded perspective view of an example of a fan rotor.

(4) FIG. 2 is a face view of the FIG. 1 lock.

(5) FIG. 3 is a plan view of the FIG. 2 lock, seen looking along arrow III.

(6) FIG. 4 is a side view of the FIG. 2 lock, seen looking along arrow IV.

DETAILED DESCRIPTION OF EMBODIMENT(S)

(7) An embodiment is described in detail below with reference to the accompanying drawings. This embodiment illustrates the characteristics and advantages of the invention. It should nevertheless be recalled that the invention is not limited to this embodiment.

(8) The fan rotor 11 of FIG. 1 is made up mainly of a disk 13 having fan blades 15 attached thereto. Each blade 15 has a blade root 17 engaged in a corresponding slot or groove 18 in the disk 13.

(9) In this example, the disk 13 has radial splines 20 at its periphery extending over a certain length parallel to the axis of the rotor. Between them, the splines 20 define the slots 18. The profile of the splines 20 is such that two side bulges 22 lie beside the top opening of each slot 18. The shape of the splines 20, and thus of the slot 18, is determined so as to retain the blade roots 17. A longitudinal spacer (not shown) may be interposed between the bottom of the slot 18 and the blade root 17 in order to stabilize the radial position of the blade.

(10) The upstream ends of the slots 18 may be closed, both collectively by an annular end plate 26, and individually by respective locks 28. The annular end plate 26 may be assembled to the disk 13 by means of screws 30.

(11) In this example, each lock 28 is engaged in notches 34 formed on either side of the slot 18 that is closed by the lock 28, in the vicinity of the upstream end of the slot. More precisely, each notch 34 may be formed in the respective splines 20 on either side of the slot 18, close to the upstream ends of the splines. The lock 28 thus opposes axial movement of the blade 15 in the upstream direction.

(12) With reference to FIGS. 2 to 4, the lock 28 comprises a composite body 50. The body 50 comprises a woven fiber structure embedded in a matrix. For example, the fiber structure is made of intermediate modulus carbon fibers (e.g. “IM7” fibers), and it may be made by three-dimensional weaving. This fiber structure is embedded in an organic resin, for example an epoxy resin (e.g. a “PR520” resin), forming the matrix of the composite body 50.

(13) A damper pad 60 made of elastomer, e.g. of butyl rubber or ethylene propylene diene monomer (EPDM), is fastened on the downstream face of the composite body. For example, the damper pad 60 may be adhesively bonded using a methacrylate adhesive (e.g. an “Araldite 2048” adhesive), after surface treatment.

(14) Optionally, as shown in FIG. 4, a portion of the fiber structure, situated opposite the damper pad, may form a tab 52 that projects away from the damper pad 60.

(15) The embodiment described in the present description is given by way of nonlimiting illustration, and in the light of this description, the person skilled in the art can easily modify this embodiment or can envisage others, while remaining within the scope of the invention.

(16) Furthermore, the term “comprising a” should be understood as being synonymous with “comprising at least one”, unless specified to the contrary.

(17) Finally, the various characteristics of the embodiment described in the present description may be considered in isolation or may be combined with one another. When they are combined, these characteristics may be combined as described above or in other ways, the invention not being limited to the specific combinations described above. In particular, unless specified to the contrary or unless there is technical incompatibility, a characteristic described with reference to any one particular embodiment may be applied in analogous manner to another embodiment.