# US 2013/0156590 A1 · Gas turbine engine rotor wheel having composite material blades with blade-root to disk connection being obtained by clamping

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- Number: US 2013/0156590 A1
- Document ID: US20130156590A1
- Status: Published application
- Kind: A1
- Application number: 13/698,208
- Filed: 2011-06-21
- Published: 2013-06-20
- Earliest claimed: 2010-06-25
- Assignees: Snecma
- Inventors: Stephane Pierre Guillaume Blanchard; Laurent Pierre Joseph Ricou
- Web page: https://patentgrep.com/patent/US20130156590A1

## CPC

- F01D 5/3023: {of radial insertion type, e.g. in individual recesses}
- F01D 5/3046: {the rotor having ribs around the circumference}
- F01D 5/3053: {by means of pins}
- F01D 5/3069: {between two discs or rings}
- F01D 5/282: {Selecting composite materials, e.g. blades with reinforcing filaments}
- F05D 2250/25: helical
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A rotor wheel for a gas turbine engine, the wheel including: a metal holder disk including a plurality of teeth at its periphery, the teeth extending radially outwards from the disk; a plurality of composite material blades, each blade including a root engaged between two adjacent teeth of the holder disk and that is held against the teeth by a pivot connection; a clamp disk including a plurality of teeth at its periphery extending in an axial direction, the clamp disk being fastened against the holder disk and on the same axis, with each of its teeth taking up a circumferential position between a blade root and a tooth of the holder disk; and a mechanism exerting a clamping force in a circumferential direction urging the teeth of the clamp disk against the blade roots.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

A rotor wheel for a gas turbine engine, the wheel comprising:
a metal holder disk including a plurality of teeth at its periphery, the teeth extending radially outwards from the disk;
a plurality of composite material blades, each blade including a root that is engaged between two adjacent teeth of the holder disk and that is held against the teeth by a pivot connection;
a clamp disk including a plurality of teeth at its periphery extending in an axial direction, the clamp disk being fastened against the holder disk and on a same axis, with each of its teeth taking up a circumferential position between a blade root and a tooth of the holder disk; and
means for exerting a clamping force in a circumferential direction urging the teeth of the clamp disk against the blade roots.

### Claim 13 (depends on 12)

A wheel according to claim 12, wherein the clamp disk is fastened to the holder disk by a helical connection enabling a clamping force to be exerted in a circumferential direction urging the teeth of the clamp disk against the blade roots.

### Claim 14 (depends on 13)

A wheel according to claim 13, wherein the helical connection comprises a plurality of positioning screws, each passing through two holes with offset centers that are formed in respective fastener flanges of the disks.

### Claim 15 (depends on 12)

A wheel according to claim 12, wherein each pivot connection comprises a peg that extends in a circumferential direction from one of side faces of a respective one of the teeth of the holder disk and that passes through a hole made in the corresponding blade root.

### Claim 16 (depends on 12)

A wheel according to claim 12, wherein each blade root includes a first side face that bears flatly against a side face of a tooth of the holder disk, and a second side face opposite from the first and that bears flatly against a side face of a tooth of the clamp disk.

### Claim 17 (depends on 12)

A wheel according to claim 12, further comprising means for centering the clamp disk on the holder disk.

### Claim 18 (depends on 12)

A wheel according to claim 12, wherein the clamp disk comprises a plurality of angular disk segments that are arranged circumferentially end to end.

### Claim 19 (depends on 12)

A wheel according to claim 12, wherein each blade root comes into radial abutment against a bottom of a groove defined between two adjacent teeth of the holder disk.

### Claim 20 (depends on 12)

A wheel according to claim 12, wherein each blade root comes axially into abutment against a bottom of a groove defined between two adjacent teeth of the clamp disk.

### Claim 21 (depends on 12)

A wheel according to claim 12, wherein the blades are made of ceramic matrix composite material.

### Claim 22 (depends on 12)

A gas turbine engine comprising at least one wheel according to claim 12.