# US 2014/0193245 A1 · Turbo engine comprising a damping fluid film for damping a guide bearing of a shaft of the turbo engine and method of adjusting the thickness of such a damping fluid film

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0193245 A1
- Document ID: US20140193245A1
- Status: Published application
- Kind: A1
- Application number: 14/240,152
- Filed: 2012-09-04
- Published: 2014-07-10
- Earliest claimed: 2011-09-05
- Assignees: Snecma
- Inventors: Serge Rene Morreale; Albert Vial; Fabrice Chevillot
- Web page: https://patentgrep.com/patent/US20140193245A1

## CPC

- F01D 1/04: traversed by the working-fluid substantially axially
- F01D 25/164: {Flexible supports; Vibration damping means associated with the bearing}
- F02C 7/06: Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M)
- F16C 27/045: {with a fluid film, e.g. squeeze film damping}
- F16F 15/0237: {involving squeeze-film damping}
- F05D 2240/50: Bearings
- F05D 2250/232: conical
- F16C 19/06: with a single row or balls
- F16C 19/26: with a single row of rollers
- F16C 2360/23: Gas turbine engines
- Y10T 29/49229: Prime mover or fluid pump making
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A turbine engine including a casing, a turbine engine shaft extending axially, a guide bearing for guiding the turbine engine shaft in the casing, the guide bearing including an inner circumferential ring rigidly connected to the turbine engine shaft, an outer circumferential ring fitted in a housing of the casing, and gripping rolling members, and a damping cavity configured to receive a damping fluid to form a damping fluid film for damping the guide bearing, the cavity being delimited radially between an outer surface of the outer ring and an inner surface of the housing. The outer surface of the outer ring and the inner surface of the housing are conical surfaces.

## Claims

### Claim at position 1

1-6. (canceled)

### Claim 7

A turbine engine comprising:
a casing including an annular cavity in which is fitted a circumferential housing ring with an outer surface in contact with an inner surface of the annular cavity of the casing;
a turbine engine shaft extending axially;
a guide bearing for guiding the turbine engine shaft in the casing, the guide bearing including an inner circumferential ring rigidly connected to the turbine engine shaft and an outer circumferential ring fitted in the housing ring and gripping rolling members;
a damping cavity, configured to receive a damping fluid to form a damping fluid film for damping the guide bearing, the damping cavity being delimited radially between an outer surface of the outer ring and an inner surface of the housing ring, the outer surface of the outer ring and the inner surface of the housing ring being conical surfaces; and
means for adjusting an axial position of the housing ring relative to the casing, the adjustment means including a shim fitted removably to the housing ring.

### Claim 8 (depends on 7)

A turbine engine according to claim 7, wherein the outer surface of the outer ring and the inner surface of the housing ring are conical surfaces of revolution with substantially a same cone angle.

### Claim 9 (depends on 7)

A turbine engine according to claim 7, wherein the shim and the housing ring are rigidly connected to the casing by at least one retaining bolt.

### Claim 10 (depends on 7)

A turbine engine according to claim 7, wherein the housing ring includes a radial flange, formed at a longitudinal extremity of a body of the housing ring, to which the adjustment means is fixed.

### Claim 11 (depends on 7)

A turbine engine according to claim 7, wherein a longitudinal body of the housing ring includes a plurality of radial distribution orifices.

### Claim 12

A method for adjusting a thickness of a damping fluid film for damping a guide bearing of a turbine engine shaft in a turbine engine casing including an annular cavity in which there is fitted a circumferential housing ring including an outer surface in contact with an inner surface of the annular cavity of the casing, the guide bearing including an inner circumferential ring rigidly connected to the turbine engine shaft and an outer circumferential ring fitted in the housing ring and gripping rolling members, a damping cavity, configured to receive a damping fluid to form a damping fluid film for damping the guide bearing, the cavity being delimited radially between an outer conical surface of the outer ring and an inner conical surface of the housing ring, the method comprising:
positioning a shim between the housing ring and the casing to axially displace the outer ring relative to the housing ring to modify a radial thickness of the damping fluid film.