Mid-turbine frame assembly
A fastener assembly includes a first component that includes a bushing opening. A second component includes a fastener opening. A threaded bushing is at least partially located within the bushing opening. A fastener extends through the fastener opening and engages the bushing.
1. A fastener assembly comprising:
a tie rod including a tie rod flange and a bushing opening located in the tie rod flange;
an inner frame case including a fastener opening;
a threaded bushing at least partially located within the bushing opening, wherein the threaded bushing includes a cylindrical portion extending from a bushing flange and the cylindrical portion is located within the bushing opening and the bushing flange is spaced from the bushing opening; and
a fastener extending through the fastener opening and engaging the bushing, wherein the bushing opening includes a first axial length extending between a radially inner edge and a radially outer edge of the tie rod flange and the cylindrical portion of the threaded bushing includes a second axial length extending from the bushing flange to a distal end surface of the cylindrical portion, with the first axial length greater than the second axial length, wherein the bushing flange includes a tab for engaging a portion of the tie rod to prevent the bushing from rotating and the tab includes an edge having a radius that is larger than a radius of an edge of the bushing flange opposite the tab.
2. The assembly of claim 1 , wherein the tie rod is made of a first material and the bushing is made of a second dissimilar material.
3. The assembly of claim 1 , wherein the second axial length is between 80% and 95% of the first axial length.
4. The assembly of claim 1 , wherein the distal end surface of the cylindrical portion on the threaded bushing is spaced from the inner frame case by a clearance gap.
5. The assembly of claim 1 , wherein the tie rod includes a projecting portion extending from the tie rod flange and the tab engages the projecting portion of the tie rod to prevent the bushing from rotating.
6. A gas turbine engine comprising:
a mid-turbine frame located axially between a first turbine and a second turbine, the mid-turbine frame comprising:
an inner frame case including a fastener opening;
a tie rod including a tie rod flange having a bushing opening and a projecting portion extending from the tie rod flange;
a threaded bushing at least partially located within the bushing opening, wherein the threaded bushing includes a cylindrical portion extending from a bushing flange and the cylindrical portion is located within the bushing opening and the bushing flange is spaced from the bushing opening, wherein the bushing flange includes a tab for engaging the projecting portion of the tie rod to prevent the bushing from rotating, wherein the tab includes an edge having a radius that is larger than a radius of an edge of the bushing flange opposite the tab; and
a fastener extending through the fastener opening and engaging the bushing.
7. The gas turbine engine of claim 6 , wherein the bushing opening includes a first axial length and the cylindrical portion includes a second axial length from the bushing flange to a distal end surface of the cylindrical portion, with the first axial length greater than the second axial length.
8. The gas turbine engine of claim 7 , wherein the second axial length is between 80% and 95% of the first axial length and the tie rod is made of a first material and the bushing is made of a second dissimilar material.
9. The gas turbine engine of claim 6 , wherein the cylindrical portion includes a distal end spaced from the inner frame case by a clearance gap.