Bearing thermal relief fan drive gear system assembly method

Patent metadata

Field	Value
Publication number	US-10495151-B2
Application number	US-201815955022-A
Country	US
Kind code	B2
Filing date	Apr 17, 2018
Priority date	Mar 4, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

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 assembling mating components comprising the steps of:
heating an inner surface of a first cavity of a first part with a first inductive coil disposed within the first cavity to a first temperature to generate a first expansion condition;
heating an outer surface of a bearing assembly with a second inductive coil disposed about the outer surface surrounding an outer periphery of the first part to a second temperature different than the first temperature to generate a second expansion condition of the bearing assembly that corresponds to the first expansion condition of the first part;
inserting a second part into the first cavity while the first part is in the first expansion condition ;and
cooling the first part to contract around the second part.

2. The method as recited in claim 1 , wherein the first part comprises a first shaft including a splined interior surface and the second part comprises a second shaft including a splined exterior surface receivable within the splined interior surface of the first part.

3. The method as recited in claim 2 , wherein the first shaft comprises a coupling shaft for driving a geared architecture and the second shaft comprises a shaft driven by a turbine section of a gas turbine engine.

4. The method as recited in claim 3 , wherein the bearing assembly includes an inner race, an outer race and a bearing disposed therebetween and heating the bearing assembly expands the inner race and the outer race in proportion to expansion of the firstshaft.

5. The method as recited in claim 4 , including a housing supporting the bearing assembly, wherein the heating of the bearing assembly comprises application of heat to the housing to generate the expansion of the bearing assembly in proportion to expansion of the first shaft.

6. The method as recited in claim 1 , including detecting expansion with a sensor to determine if a predetermined amount of expansion between the first part and the component has occurred to enable installation of the second part into the first part.

Assignees

• United Technologies Corp

Inventors

• Lin Ning
• Cherpician Berci

Classifications

• F05D2230/60

  Assembly methods · CPC title

• F16C19/525

  related to temperature and heat, e.g. insulation · CPC title

• F16C35/067

  Fixing them in a housing (with interposition of an element F16C35/07) · CPC title

• F02C7/36

  Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user ({F02C3/107 - F02C3/13 and} F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H) · CPC title

• F16D2001/103

  the torque is transmitted via splined connections · CPC title