Platform of small hub-tip ratio

Patent metadata

Field	Value
Publication number	US-10253640-B2
Application number	US-201514959272-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Dec 8, 2014
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A platform for a bladed wheel having a small hub-tip ratio, suitable for being fabricated out of composite material from a three-dimensionally woven fiber preform, the platform including a bottom wall, a top wall defining an air flow passage, and two side walls extending transversely between the bottom wall and the top wall, wherein the side walls extend longitudinally beyond the upstream end of the bottom wall. The platform further includes a fastener tab that is folded from the upstream end of the bottom wall.

First claim

The invention claimed is:

1. A platform for a bladed wheel having a hook projecting from a top of a tooth of a disk, the platform comprising:
a bottom wall;
a top wall for defining an air flow passage; and
two side walls respectively joined to the bottom wall such that the bottom wall extends between the two side walls, the two side walls each extending transversely between the bottom wall and the top wall, wherein the side walls each terminate at an upstream end of the respective side wall, and wherein a portion of each of the side walls being located closest to the plane of the bottom wall comprises the upstream end of the respective side wall, the upstream ends of the side walls being located longitudinally upstream relative to an upstream end of the bottom wall; and
wherein the platform further includes a fastener tab that is folded downstream from the upstream end of the bottom wall, to cooperate with the hook.

2. The platform according to claim 1 , comprising a first fiber structure possessing a bottom portion, two side portions extending transversely from the bottom portion, and a fastener tongue that is folded downstream from the upstream end of the bottom portion.

3. The platform according to claim 2 , wherein the first fiber structure is constituted by a single sheet that is woven three-dimensionally as a single piece.

4. The platform according to claim 3 , wherein the height of the side portions of the first fiber structure diminishes going upstream, such that the upstream ends of said side portions taper.

5. The platform according to claim 2 , further including a second fiber structure possessing a top portion and two side portions extending transversely from the top portion.

6. The platform according to claim 5 , wherein the second fiber structure is engaged with the first fiber structure, the side portions of one of the fiber structures being received between the side portions of the other fiber structure.

7. A bladed wheel for a turbine engine, the wheel comprising:
a disk suitable for being coupled to a shaft of the turbine engine, the circumference of the disk presenting a succession of slots and of teeth;
a plurality of blades mounted in the slots of the disk; and
at least one platform according to claim 1 provided between two blades and facing the tooth of the disk, the fastener tab of the platform co-operating with an assembly member of the tooth.

8. A turbine engine including a bladed wheel according to claim 7 .

Assignees

• Safran Aircraft Engines

Inventors

• Mortier Roland
• Bourseaulx Sylvain
• Masson Antoine
• Ravier Anne-Laure
• Steenbakker Noemie

Classifications

• B29B11/14 Primary

  characterised by structure or composition · CPC title

• F04D29/329

  Details of the hub · CPC title

• F01D5/326

  Locking of axial insertion type blades by other means · CPC title

• F05D2300/6033

  Ceramic matrix composites [CMC] · CPC title

• F01D5/3007 Primary

  of axial insertion type · CPC title