Shroud hanger assembly
A shroud hanger assembly is provided for hangers and shrouds defining dimensionally incompatible components such as those which are press or frictionally fit to engage one another. The shroud hanger assembly includes a multi-piece hanger and a shroud that is pinned to the hanger assembly by at least one axially extending pin and which locates the shroud relative to the hanger to control motion in one or both of circumferential (tangential) and radial directions relative to the engine.
1. A shroud and hanger assembly, comprising:
a hanger having a first hanger portion and a second hanger portion;
a shroud having a forward wall, an aft wall, and a base extending between and connecting the forward wall and the aft wall; and
at least one axially oriented pin received at least in part by the first hanger portion and the forward wall;
wherein the hanger has a third hanger portion, and wherein the first hanger portion and the third hanger portion sandwich the forward wall of the shroud, and the second hanger portion and the third hanger portion sandwich the aft wall of the shroud.
2. The shroud and hanger assembly of claim 1 , wherein the at least one axially oriented pin extends between the first hanger portion and the second hanger portion and through the forward wall and the aft wall.
3. The shroud and hanger assembly of claim 1 , wherein the at least one axially oriented pin extends through the third hanger portion.
4. The shroud and hanger assembly of claim 1 , wherein the third hanger portion has a forward leg and an aft leg, the first hanger portion and the forward leg of the third hanger portion sandwich the forward wall of the shroud, and the second hanger portion and the aft leg of the third hanger portion sandwich the aft wall of the shroud.
5. The shroud and hanger assembly of claim 4 , wherein the at least one axially oriented pin extends through the forward leg of the third hanger portion.
6. The shroud and hanger assembly of claim 1 , wherein the forward wall and the aft wall have different radial lengths.
7. The shroud and hanger assembly of claim 6 , wherein the forward wall has a greater radial length than the aft wall.
8. The shroud and hanger assembly of claim 1 , wherein the forward wall and the aft wall are of equivalent radial lengths.
9. The shroud and hanger assembly of claim 1 , wherein a cavity is defined between the forward wall and the aft wall of the shroud, and wherein the first hanger portion and the third hanger portion define a channel that allows air to flow into the cavity and onto the base of the shroud.
10. The shroud and hanger assembly of claim 9 , wherein a forward surface of the first hanger portion defines an inlet of the channel.
11. The shroud and hanger assembly of claim 1 , wherein the hanger has a web that extends between and connects the first hanger portion and the second hanger portion.
12. The shroud and hanger assembly of claim 1 , further comprising:
an axial bolt holding the first hanger portion and the second hanger portion together.
13. The shroud and hanger assembly of claim 1 , wherein the first hanger portion has a first flange support and the second hanger portion has a second flange support, and wherein the first flange support receives at least a portion of the forward wall of the shroud and the second flange support receives at least a portion of the aft wall of the shroud.
14. The shroud and hanger assembly of claim 13 , wherein the first flange support has a forward leg and an aft leg and the second flange support has a forward leg and an aft leg, and wherein the forward wall of the shroud is sandwiched between the forward and aft legs of the first flange support and the aft wall of the shroud is sandwiched between the forward and aft legs of the second flange support.
15. The shroud and hanger assembly of claim 14 , wherein the at least one axially oriented pin extends through the forward and aft legs of the first flange support and through the forward and aft legs of the second flange support.
16. The shroud and hanger assembly of claim 1 , wherein the forward wall and the aft wall of the shroud each define a locating pin aperture, wherein the at least one axially oriented pin extends through the locating pin aperture defined by the forward wall and the locating pin aperture defined by the aft wall.
17. The shroud and hanger assembly of claim 16 , wherein the forward wall and the aft wall of the shroud each define a guide pin aperture, the guide pin aperture defined by the forward wall and the guide pin aperture defined by the aft wall being oppositely positioned from one another and each having an elongated or oblong shape.
18. A shroud and hanger assembly, comprising:
a hanger having a first hanger portion and a second hanger portion;
a shroud having a forward wall, an aft wall, and a base extending between and connecting the forward wall and the aft wall, wherein a cavity is defined between the forward wall and the aft wall of the shroud; and
at least one axially oriented pin received at least in part by the first hanger portion, the forward wall, the aft wall, and the second hanger portion, and
wherein the hanger defines a channel that allows air to flow into the cavity and onto the base of the shroud, a forward surface of the first hanger portion defining an inlet of the channel.
19. A shroud and hanger assembly, comprising:
a hanger having a first hanger portion and a second hanger portion;
a shroud having a forward wall, an aft wall, and a base extending between and connecting the forward wall and the aft wall, the forward wall having a locating pin aperture at a first circumferential end of the shroud and a guide pin aperture at a second circumferential end of the shroud, the aft wall having a locating pin aperture at the first circumferential end of the shroud and a guide pin aperture at the second circumferential end of the shroud, the first circumferential end being circumferentially offset from the second circumferential end;
a first axially oriented pin press fit through the first hanger portion and the second hanger portion and extending through the locating pin aperture of the forward wall and the locating pin aperture of the aft wall of the shroud; and
a second axially oriented pin circumferentially offset from the first axially oriented pin, the second axially oriented pin press fit through the first hanger portion and the second hanger portion and extending through the guide pin aperture of the forward wall and the guide pin aperture of the aft wall of the shroud; and
wherein a shape of the locating pin aperture is different than a shape of guide pin aperture, and wherein the difference in shape between the locating pin aperture and the guide pin aperture permits circumferential growth of the shroud.