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US 10,502,235 B2Granted
Method for tight control of bolt holes in fan assembly
AssigneeUnited Technologies Corporation
InventorsThomas J. Robertson, Mark W. Costa
Life of this patent
Estimating the term…
Abstract
In a fan case having an annular outer wall with a plurality of fan case bolt holes there through, bushings are inserted into the fan case bolt hole and are dimensioned to define an annular gap between the bolt hole inner surface and the bushing outer surface. An adhesive material disposed within each annular gap between the bushing and the corresponding fan case bolt hole, with the adhesive material forming a liquid shim separating the bushing outer surface from the bolt hole inner surface.
Claims7
A fan case assembly for a gas turbine engine, comprising:
- a fan case having an annular outer wall and an annular sleeve disposed on an outer surface of the annular outer wall, the annular outer wall and the annular sleeve having a plurality of fan case bolt holes extending therethrough, wherein each of the plurality of fan case bolt holes has a bolt hole inner surface having a bolt hole inner diameter;
- a plurality of bushings each having a cylindrical body having a bushing inner surface defining a cylindrical bore having a bushing inner diameter and a bushing outer surface with a bushing outer diameter that is less than the bolt hole inner diameter, wherein the cylindrical body of each of the plurality of bushings is inserted into a corresponding one of the plurality of fan case bolt holes with an annular gap being defined between the bolt hole inner surface and the bushing outer surface, wherein each of the plurality of bushings has a top edge and comprises a flange extending radially outwardly from the cylindrical body at the top edge and having a flange outer diameter that is greater than the bolt hole inner diameter, wherein the flange of each of the plurality of bushings directly contacts an outer surface of the annular sleeve;
- and
- an adhesive material disposed within the annular gap between each one of the plurality of bushings and the corresponding one of the plurality of fan case bolt holes, wherein the adhesive material forms a liquid shim separating the bushing outer surface from the bolt hole inner surface of the corresponding one of the plurality of fan case bolt holes.
1 more element
Dependencies are inferred from the claim text.