# US 2013/0156574 A1 · Rolling bearing for aircraft turbojet fitted with improved means of axial retention of its outer ring

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- Number: US 2013/0156574 A1
- Document ID: US20130156574A1
- Status: Published application
- Kind: A1
- Application number: 13/701,660
- Filed: 2011-05-31
- Published: 2013-06-20
- Earliest claimed: 2010-06-02
- Assignees: Snecma
- Inventors: Serge Louis Antunes; Michel Brault
- Web page: https://patentgrep.com/patent/US20130156574A1

## CPC

- F01D 25/164: {Flexible supports; Vibration damping means associated with the bearing}
- F01D 21/045: {special arrangements in stators or in rotors dealing with breaking-off of part of rotor}
- F16C 27/045: {with a fluid film, e.g. squeeze film damping}
- F16C 33/581: {integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels}
- F05D 2260/30: Retaining components in desired mutual position
- F16C 19/26: with a single row of rollers
- F16C 2360/23: Gas turbine engines
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 29/4932: Turbomachine making
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A structure for an aircraft turbojet including a rolling bearing including an outer ring, a bearing bracket, a retaining ring interposed between the ring and the bracket, a mechanism to connect the ring onto the bracket incorporating an attaching flange installed on the bearing bracket, a flexible connection attached to the ring and to the flange, and a mechanism enabling axial retention of the ring, in event the flexible connection fractures. The mechanism enabling axial retention includes a first stop securely attached to the retaining ring and capable of axially retaining this retaining ring relative to the bracket, and a second stop securely attached to the retaining ring, and capable of axially retaining the ring relative to the retaining ring.

## Claims

### Claim at position 1

1-7. (canceled)

### Claim 8

A structure for an aircraft turbojet comprising:
a rolling bearing including an outer ring;
a bearing bracket surrounding the outer ring;
a retaining ring interposed between the outer bearing ring and the bearing bracket;
means for connecting the outer ring to the bearing bracket, wherein the means for connecting includes:
an attaching flange installed on the bearing bracket; and
flexible means for connection attached to the outer bearing ring and to the attaching flange;
meant for allowing axial retention of the outer bearing ring, if the flexible connection means fracture,
wherein the means enabling axial retention of the outer ring includes:
first stop means securely attached to the retaining ring, and capable of axially retaining the retaining ring relative to the bearing bracket in event that the flexible connection means fracture; and
second stop means securely attached to the retaining ring, and capable of axially retaining the outer ring relative to the retaining ring, in the event that the flexible connection means fracture,
wherein the second stop means includes multiple slugs spaced circumferentially relative to one another, wherein each slug is held in a slug insertion opening made in the retaining ring, wherein the slugs include a radially internal end which is located in a groove made on the outer bearing ring fitted with multiple radial clearance through-holes, emerging in a base of the groove, wherein each of the slugs is positioned radially opposite a full portion of the base of the groove.

### Claim 9 (depends on 8)

A structure according to claim 8, wherein each of the slugs is located radially opposite the attaching flange.

### Claim 10 (depends on 8)

A structure according to claim 8, wherein the flexible connection means includes multiple spindles spaced circumferentially relative to one another, wherein each one is U-shaped, and positioned in a radial plane.

### Claim 11 (depends on 8)

A structure according to claim 8, wherein the first stop means includes a skirt positioned axially between the bearing bracket and the attaching flange.

### Claim 12 (depends on 11)

A structure according to claim 11, wherein the skirt includes notches spaced circumferentially relative to one another, and cooperating with catches that are securely attached to the bearing bracket, to limit/prevent rotation of the retaining ring relative to the bearing bracket.

### Claim 13 (depends on 8)

A method of installing a structure for an aircraft turbojet according to claim 8, comprising:
inserting the outer bearing ring in the retaining ring, so as to align radially each of the clearance holes made in the ring with a slug insertion opening made in the retaining ring;
inserting the slugs in the slug insertion openings, through the through-holes, so as to place the radially internal end of each slug in the groove of the outer ring;
rotating the outer bearing ring such that each slug is located radially opposite the full portion of the base of the groove; and
installing the attaching flange on the bearing bracket.

### Claim 14 (depends on 8)

An aircraft turbojet comprising a structure according to claim 8.