# US 9,435,373 B2 · Bearing with double pre-loading

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- Number: US 9,435,373 B2
- Document ID: US9435373B2
- Status: Granted
- Kind: B2
- Application number: 14/780,721
- Filed: 2014-03-18
- Published: 2016-02-11
- Granted: 2016-09-06
- Earliest claimed: 2013-03-28
- Assignees: Snecma
- Applicants: Snecma
- Inventors: Sebastien Boufflert; Philippe Bourdin; Alban Lemaitre; Fabien Tessier
- Web page: https://patentgrep.com/patent/US9435373B2

## CPC

- F16C 25/083: {with resilient means acting axially on a race ring to preload the bearing}
- F16C 19/06: with a single row or balls
- F16C 19/163: {with angular contact}
- F16C 33/60: divided {or split, e.g. comprising two juxtaposed rings}
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

In a rotary machine bearing including an inner ring, an outer ring, and rolling elements between them, one of the inner and outer rings includes first and second half-rings suitable for being clamped in the axial direction between a thrust member and a first pre-loading system exerting a first predetermined axial force, and a second pre-loading system is provided that is inserted in the axial direction between the first and second half-rings and that exerts a second predetermined axial force less than the first predetermined axial force.

## Claims

### Claim 1

A bearing for a rotary machine, the bearing comprising:
an inner ring,
an outer ring,
rolling elements between said inner and outer ring, a first pre-loading system exerting a first predetermined axial force, one of said inner and outer rings comprising first and second half-rings capable of being clamped in the axial direction between a thrust member and said first pre-loading system, and
a second pre-loading system inserted in the axial direction between said first and second half-rings and exerting a second predetermined axial force less than said first predetermined axial force.

### Claim 2 (depends on 1)

A bearing according to claim 1, wherein said first and second half-rings constitute said outer ring and are for mounting slidably in a stationary casing.

### Claim 3 (depends on 2)

A bearing according to claim 2, wherein said stationary casing comprises a portion forming the thrust member.

### Claim 4 (depends on 1)

A bearing according to claim 1, wherein said first and second half-rings constitute said inner ring and are designed to be slidably mounted around a stationary shaft.

### Claim 5 (depends on 4)

A bearing according to claim 4, wherein said stationary shaft comprises a portion forming the thrust member.

### Claim 6 (depends on 1)

A bearing according to claim 1, wherein the first and second pre-loading systems comprise respective resilient assemblies.

### Claim 7 (depends on 6)

A bearing according to claim 6, wherein each said resilient assembly comprises one or more spring washers.

### Claim 8 (depends on 1)

A bearing according to claim 1, wherein said rolling elements are oblique-contact bearing balls.

### Claim 9 (depends on 1)

A bearing according to claim 1, applied to an axial thrust bearing of a rotary machine mounted on radial fluid bearings.