Extraction sleeve

Patent metadata

Field	Value
Publication number	US-10400810-B2
Application number	US-201515515446-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Sep 30, 2014
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

An extraction sleeve for extracting two rotationally symmetrical parts that are joined together by interference fit, the extraction sleeve including: a head having a conical part; a cylindrical body, the internal part of the cylindrical body having a screw thread suitable for the screwing of an extraction screw; the conical part of the head of the extraction sleeve forming a friction component suitable for coming into contact with one of the rotationally symmetrical parts, the friction component being designed so as to determine a limit slipping torque greater than the friction torque generated at the screw thread of the sleeve by screwing of the extraction screw.

First claim

The invention claimed is:

1. An extraction sleeve for the extraction of two parts of revolution assembled by interference fit, said extraction sleeve comprising:
a head with a conical part; and
a cylindrical-shaped body, an internal part of the cylindrical body having a screw thread adapted to enable screwing of an extraction screw, the cylindrical-shaped body having an external part without a screw thread;

said conical part of the head of the extraction sleeve forming a friction component adapted to come into contact with one of the two parts of revolution, said friction component being sized so as to determine a limiting slip torque higher than a friction torque generated at the sleeve screw thread by screwing the extraction screw, wherein an angle of inclination of the conical part of the head relative to a longitudinal axis of the extraction sleeve is equal to 45°.

2. A disassembly extraction system that comprises, for a turbine machine:
a first part of revolution with an attachment flange and a second part of revolution with an attachment flange, the first and second parts of revolution being assembled by interference fit at their attachment flange;
a plurality of extraction sleeves, each of the plurality of extraction sleeves including
a head with a conical part; and
a cylindrical-shaped body, an internal part of the cylindrical body having a screw thread adapted to enable screwing of an extraction screw, the cylindrical-shaped body having an external part without a screw thread;
said conical part of the head of the extraction sleeve forming a friction component adapted to come into contact with one of the first and second parts of revolution, said friction component being sized so as to determine a limiting slip torque higher than a friction torque generated at the sleeve screw thread by screwing the extraction screw;

said attachment flange of the first part of revolution having a plurality of orifices distributed around a periphery of said attachment flange adapted to hold said extraction sleeves.

3. The disassembly extraction system according to claim 2 , wherein an angle of inclination of the conical part of the head relative to a longitudinal axis of the extraction sleeve is equal to α.

4. The disassembly extraction system according to claim 3 , wherein the angle of inclination α is between 10° and 60°.

5. The disassembly extraction system according to claim 2 , wherein the extraction sleeve is adapted for the extraction of two parts of revolution of a turbine machine assembled by interference fit.

6. The disassembly system according to claim 2 , further comprising a plurality of extraction screws with a screw thread adapted to cooperate with said plurality of extraction sleeves.

Assignees

• Safran Aircraft Engines

Inventors

• Leutard Florence Irène Noëlle
• Bauduin Pierrick Raphael Americo
• Renon Olivier
• Sultana Patrick

Classifications

• F01D25/28

  Supporting or mounting arrangements, e.g. for turbine casing · CPC title

• B25B27/16

  abutted flanges · CPC title

• F05D2260/30

  Retaining components in desired mutual position · CPC title

• F01D25/243

  Flange connections; Bolting arrangements (F01D25/265 takes precedence) · CPC title

• F01D5/005

  Repairing methods or devices · CPC title