# US 2014/0193265 A1 · Rotor disk including a plurality of hooks

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- Number: US 2014/0193265 A1
- Document ID: US20140193265A1
- Status: Published application
- Kind: A1
- Application number: 14/146,484
- Filed: 2014-01-02
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: Snecma
- Applicants: Snecma
- Inventors: Patrick Adenis; Claude Lejars; Silvain Lormier; Sylvain Poitout
- Web page: https://patentgrep.com/patent/US20140193265A1

## CPC

- F01D 25/243: {Flange connections; Bolting arrangements (F01D25/265 takes precedence)}
- B23P 6/002: {Repairing turbine components, e.g. moving or stationary blades, rotors, (B23P6/045 takes precedence)}
- F01D 5/3015: {with side plates}
- F01D 5/326: {Locking of axial insertion type blades by other means}
- F01D 11/006: {Sealing the gap between rotor blades or blades and rotor}
- Y10T 29/49318: Repairing or disassembling
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rotor disk comprises a plurality of circumferentially distributed hooks, the set of hooks defining an annular groove adapted to cooperate with at least two flange sectors. At least one of the hooks comprises a second element through which a recess is formed which opens up at each of the transverse flanks of the second element and at the internal peripheral surface of the second element.

## Claims

### Claim 1

Rotor disk fitted with a plurality of circumferentially distributed hooks, each hook having:
a first element starting on a transverse flank of said rotor disk and extending along the longitudinal axis of said rotor disk,
a second element starting at the end of said first element, said second element extending radially in the direction of the longitudinal axis of said rotor disk,
in which the set of hooks define an annular groove adapted to cooperate with at least two flange sectors, at least one of said hooks comprising a second element through which a recess is formed which opens up at each of the transverse flanks of said second element and at the internal peripheral surface of said second element, and in which the recess is below the internal radius of curvature of the junction between the first element and the second element of the hook.

### Claim 2 (depends on 1)

Rotor disk according to claim 1, in which the dimensions of the recess prevent the appearance of cracks during rotation of the rotor disk.

### Claim 3 (depends on 1)

Rotor disk according to claim 1, in which the transverse length of the recess at the internal peripheral surface of the second element is three times shorter than the transverse length of the hook, the transverse length of the recess and the transverse length of the hook being approximately perpendicular to the radius of the rotor disk.

### Claim 4 (depends on 1)

Rotor disk according to claim 1, in which the minimum radial height of said recess is of the order of 0.5 mm.

### Claim 5 (depends on 1)

Rotor disk according to claim 1, in which there is an angle between the axis of revolution of said recess and the longitudinal axis of the rotor disk.

### Claim 6 (depends on 5)

Rotor disk according to claim 5, in which the radial height of the recess below the internal radius of curvature is located on the transverse flank on the same side as the transverse flank of the rotor disk.

### Claim 7 (depends on 6)

Rotor disk according to claim 6, in which the radial height of the recess located on the opposite transverse flank is greater than the internal radius of curvature.

### Claim 8 (depends on 1)

Rotor disk according to claim 1, in which the recess has a U-shaped profile in a plane transverse to the longitudinal axis.

### Claim 9 (depends on 1)

Rotor disk according to claim 1, in which the recess has a profile following the arc of a circle, in a plane transverse to the longitudinal axis.

### Claim 10 (depends on 1)

Rotor disk according to claim 1, in which the recess has a profile following an arc of an ellipse, in a plane transverse to the longitudinal axis.

### Claim 11 (depends on 1)

Rotor disk according to claim 1, in which said rotor disk is a rotor disk of a turbomachine.

### Claim 12

Method of repairing a rotor disk comprising a plurality of circumferentially distributed hooks, each hook having:
a first element starting on a transverse flank of said rotor disk and extending along the longitudinal axis of said rotor disk,
a second element starting at the end of said first element, said second element extending radially in the direction of the longitudinal axis of the rotor disk,
the set of hooks defining an annular groove adapted to cooperate with at least two flange sectors, said repair method comprising:
delimit a zone of the second element in which there are cracks,
machine below the internal radius of curvature at the junction between the first element and the second element of the hook, a recess opening up at each of the transverse flanks of the second element and at the internal peripheral surface of the second element,
the recess at least covering said zone such that the cracks are eliminated.