Bearing thermal relief fan drive gear system assembly method

Patent metadata

Field	Value
Publication number	US-9945424-B2
Application number	US-201514637452-A
Country	US
Kind code	B2
Filing date	Mar 4, 2015
Priority date	Mar 4, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A method of assembling mating components includes the steps of heating an inner surface of a first cavity of a first part to generate a first expansion, heating an outer surface of a component surrounding an outer periphery of the first part to generate a second expansion of the component that corresponds to the first expansion of the first part, inserting a second part into the first cavity while the first part is in an expanded condition, and cooling the first part to contract around the second part.

First claim

What is claimed is:

1. A method of mating shaft sections for a gas turbine engine, the method comprising the steps of:
assembling a bearing assembly about an outer surface of a first shaft;
heating the first shaft and an inner race of the bearing assembly;
heating an outer race of the bearing assembly separately from heating of the first shaft and the inner race and at the same time as heating the first shaft and the inner race;
inserting a portion of a second shaft into a cavity of the first shaft; and
cooling the first shaft, the second shaft, the inner race and the outer race of the bearing assembly such that the first shaft shrinks onto the second shaft.

2. The method as recited in claim 1 , wherein heating the inner race of the bearing assembly comprises inserting a heating device into an inner cavity of the first shaft to an axial location corresponding to a position of the inner race on the outer surface of the first shaft and heating the inner race through the inner cavity of the first shaft.

3. The method as recited in claim 1 , wherein heating the outer race of the bearing assembly comprises positioning a heating device about an outer surface of the outer bearing race and heating the outer bearing race to expand the outer bearing race proportionate to expansion of the inner race.

4. The method as recited in claim 1 , including expanding the cavity of the first shaft to provide a fit for a portion of the second shaft.

5. The method as recited in claim 4 , wherein an interface between the cavity of the first shaft and an outer surface of the second shaft includes a splined connection.

6. The method as recited in claim 1 , including a first inductive heating element received within the first cavity for imparting heat to the first shaft and the inner bearing race and a second inductive heating element disposed about the outer housing.

7. The method as recited in claim 1 , including a housing supporting the bearing assembly and wherein heating of the outer bearing race comprises heating the housing in an axial location corresponding to an axial position of the outer bearing race.

Assignees

• United Technologies Corp

Inventors

• Lin Ning
• Cherpician Berci

Classifications

• F01D25/16

  Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) · CPC title

• F05D2260/37

  by a press fit connection · CPC title

• F16C35/063

  Fixing them on the shaft (with interposition of an element F16C35/07) · CPC title

• F16C2226/14

  by shrink fit, i.e. heating and shrinking part to allow assembly · CPC title

• F16C19/06

  with a single row or balls · CPC title