Trunnion hole repair utilizing interference fit inserts

Patent metadata

Field	Value
Publication number	US-9404374-B2
Application number	US-8222908-A
Country	US
Kind code	B2
Filing date	Apr 9, 2008
Priority date	Apr 9, 2008
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A vane shroud for a gas turbine engine has a cylindrical shaped body and a hole arranged at a circumference of the body. The hole is for receiving a trunnion from a variable vane. A counterbore is arranged concentrically around the hole on a radially inward facing surface of the body, and receives a trunnion hub from the variable vane. A shrink-fit insert is seated into the counterbore such that the trunnion hub is provided with a contact surface, and the shrink-fit insert is secured to the shroud through an interference fit.

First claim

The invention claimed is:

1. A vane shroud for a gas turbine engine, the vane shroud comprising:
a cylindrical shaped body;
a hole arranged at a circumference of the body, wherein the hole is for receiving a trunnion from a variable vane;
a counterbore arranged concentrically around the hole on a radially inward facing surface of the body, wherein the counterbore is for receiving a trunnion hub from the variable vane; and
an insert seated into the counterbore such that the trunnion hub is provided with a contact surface; wherein the insert is secured to the shroud through an interference fit.

2. The vane shroud of claim 1 wherein the insert is a pre-existing washer.

3. The vane shroud of claim 1 wherein the counterbore is over-sized by a process used to remove a damaged portion of the body.

4. The vane shroud of claim 3 wherein the insert seated into the counterbore restores the cylindrical shaped body to design dimensions.

5. The vane shroud of claim 2 wherein the insert contains tangs to further secure the insert within the shroud.

6. The vane shroud of claim 1 wherein the insert is custom made from dimensions of the counterbore prior to the installation of the insert.

7. The vane shroud of claim 1 wherein the insert is comprised of a material having a lower coefficient of friction than that of the body.

8. The vane shroud of claim 1 wherein the insert comprises at least one of the following materials: a metallic alloy and a plastic.

Assignees

• Addis Mark E
• Reynolds George H
• United Technologies Corp

Inventors

• Addis Mark E
• Reynolds George H

Classifications

• Y10T29/49865

  by temperature differential [e.g., shrink fit] · CPC title

• Y10T29/49739

  Mechanically attaching preform by separate fastener · CPC title

• Y10T29/49737

  Metallurgically attaching preform · CPC title

• Y10T29/49735

  Mechanically attaching preform with separate fastener · CPC title

• Y10T29/49726

  Removing material · CPC title