Attachment assembly and gas turbine engine with attachment assembly
An attachment assembly for attaching a center structure to an outer structure at least partially circumscribing the center structure, the attachment assembly having a bushing provided within the center structure or the outer structure, the bushing defining a first through passage, a bushing adapter slidably mounted within the first through passage and defining a second through passage, a threaded passage provided on the other of the center structure or the outer structure and a bolt passing through the first through passage and the second through passage and threaded into the threaded passage.
1. An attachment assembly for attaching a center structure to an outer structure at least partially circumscribing the center structure, the attachment assembly comprising:
a bushing provided within the center structure or the outer structure, the bushing defining a first through passage;
a bushing adapter slidably mounted within the first through passage and defining a second through passage;
a threaded passage provided on the other of the center structure or the outer structure; and
a bolt having a head and a shank with a threaded portion wherein the bolt passes through the first through passage and the second through passage, with the head abutting the bushing adapter and the threaded portion threaded into the threaded passage,
wherein the bushing adapter is able to move along the length of the first through passage after the attachment assembly is fully assembled.
2. The attachment assembly according to claim 1 , further comprising a belleville washer that clamps the bushing to the center structure.
3. The attachment assembly of claim 1 wherein the bolt further comprises a third through passage extending through its length and the third through passage defines a fluid path from the center structure to the outer structure.
4. The attachment assembly of claim 1 wherein the bushing has a cylindrical body that terminates in a shoulder, which forms a stop.
5. The attachment assembly of claim 1 wherein the bushing has a cylindrical internal portion.
6. The attachment assembly of claim 1 , further comprising a nut having a threaded opening forming the threaded passage.
7. The attachment assembly of claim 1 wherein an upper portion of the bushing adapter is concentric with other features of the bushing adapter.
8. An attachment assembly for attaching a center structure to an outer structure at least partially circumscribing the center structure, the attachment assembly comprising:
a bushing provided within the center structure or the outer structure, the bushing defining a first through passage;
a bushing adapter slidably mounted within the first through passage and defining a second through passage;
a threaded passage provided on the other of the center structure or the outer structure; and
a bolt having a head and a shank with a threaded portion wherein the bolt passes through the first through passage and the second through passage, with the head abutting the bushing adapter and the threaded portion threaded into the threaded passage;
wherein the bushing adapter has an annular shoulder with a rounded surface that enables a swivel joint between the bushing and the bushing adapter.
9. An attachment assembly for attaching a center structure to an outer structure at least partially circumscribing the center structure, the attachment assembly comprising:
a bushing provided within the center structure or the outer structure, the bushing defining a first through passage;
a bushing adapter slidably mounted within the first through passage and defining a second through passage;
a threaded passage provided on the other of the center structure or the outer structure; and
a bolt having a head and a shank with a threaded portion wherein the bolt passes through the first through passage and the second through passage, with the head abutting the bushing adapter and the threaded portion threaded into the threaded passage;
wherein an upper portion of the bushing adapter is eccentric and enables adjustment of an axial position of the center structure.
10. The attachment assembly of claim 9 wherein other features of the bushing adapter are concentric to an axis of the bolt.
11. A gas turbine engine, comprising:
a centerbody;
a support structure circumscribing the centerbody; and
an attachment assembly for operably coupling the centerbody to the support structure and configured to allow a cooling air flow to the centerbody, comprising:
a bushing provided on the centerbody or the support structure, the bushing defining a first through passage;
a bushing adapter slidably mounted within the first through passage and defining a second through passage;
a threaded passage provided on the other of the centerbody or the support structure; and
a bolt having a head and a shank with a threaded portion wherein the bolt passes through the first through passage and the second through passage, with the head abutting the bushing adapter and the threaded portion threaded into the threaded passage;
wherein the bushing adapter is able to move along the length of the first through passage after the attachment assembly is fully assembled.
12. The gas turbine engine of claim 11 wherein a plurality of attachment assemblies are circumferentially spaced about the centerbody and the support structure.
13. The gas turbine engine of claim 11 wherein the bolt further comprises a third through passage extending through its length.
14. The gas turbine engine of claim 11 wherein a controlled gap is located between the centerbody and a portion of the support structure.
15. The gas turbine engine of claim 11 wherein the support structure comprises an exhaust frame of the gas turbine engine.
16. The gas turbine engine of claim 11 wherein the centerbody is formed from a ceramic matrix composite.