Fusible gearbox support with catcher pin systems and methods
An assembly for mounting an auxiliary component to an engine case for a gas turbine engine includes a support bracket and a locator comprising a fusible guide pin extending at least partially into a first aperture disposed in the support bracket, and a catcher pin extending at least partially into a second aperture disposed in the support bracket. The fusible guide pin is configured to fracture to absorb energy while the catcher pin limits system displacement during and post an overload event, thus reducing the energy transmitted to the auxiliary component (e.g., a gearbox housing).
1. An assembly for mounting an auxiliary component to an engine case of a gas turbine engine, the engine case having a first flange extending circumferentially around the engine case and a second flange extending circumferentially around the engine case, the assembly comprising:
a support bracket, the support bracket having a first end configured for attachment to the first flange of the engine case, a second end configured for attachment to the second flange of the engine case, and an intermediate portion located intermediate the first end and the second end;
a first aperture disposed in the intermediate portion;
a second aperture disposed in the intermediate portion; and
a locator comprising a plate member, a fusible guide pin extending from the plate member at least partially into the first aperture, and a catcher pin extending from the plate member at least partially into the second aperture.
2. The assembly of claim 1 , wherein the fusible guide pin comprises a mechanical fuse configured to break in response to an overload event, and the catcher pin is configured to limit movement of the locator with respect to the support bracket in response to the mechanical fuse being broken.
3. The assembly of claim 2 , further comprising a bearing member disposed at least partially within the first aperture;
wherein the fusible guide pin is disposed at least partially within the bearing member.
4. The assembly of claim 3 , wherein the bearing member is press fit at least partially into the support bracket.
5. The assembly of claim 3 , wherein the bearing member comprises an outer race and a moveable member supported by, and moveable with respect to, the outer race; and
the fusible guide pin is disposed at least partially within the moveable member.
6. The assembly of claim 2 , wherein a first central axis of the fusible guide pin and a second central axis of the catcher pin are oriented radially with respect to the engine case.
7. The assembly of claim 2 , wherein a first diameter of the second aperture is greater than a second diameter of the catcher pin.
8. The assembly of claim 7 , wherein the second aperture is oversized to allow radial movement, with respect to a central axis of the second aperture, of the catcher pin within the second aperture.
9. The assembly of claim 2 , wherein the mechanical fuse comprises an annular cut that extends circumferentially about a radially outer portion of the fusible guide pin.
10. The assembly of claim 1 , further comprising a third pin extending from the plate member and configured to be received by the auxiliary component.
11. The assembly of claim 10 , wherein the third pin extends from the plate member in a direction opposite the fusible guide pin and the catcher pin.
12. A gas turbine engine, comprising:
an engine case, the engine case including a first flange extending circumferentially around the engine case and a second flange extending circumferentially around the engine case;
a support bracket, the support bracket having a first end configured for attachment to the first flange of the engine case, a second end configured for attachment to the second flange of the engine case, and an intermediate portion located intermediate the first end and the second end;
a first aperture disposed in the intermediate portion;
a second aperture disposed in the intermediate portion; and
a locator comprising a plate member, a fusible guide pin extending from the plate member at least partially into the first aperture, and a catcher pin extending from the plate member at least partially into the second aperture.
13. The gas turbine engine of claim 12 , wherein the fusible guide pin comprises a mechanical fuse configured to break in response to an overload event, and the catcher pin is configured to limit movement of the locator with respect to the support bracket when the mechanical fuse is broken.
14. The gas turbine engine of claim 13 , further comprising a bearing member disposed at least partially within the first aperture;
wherein the fusible guide pin is disposed at least partially within the bearing member.
15. The gas turbine engine of claim 14 , wherein the bearing member is press fit at least partially into the support bracket.
16. The gas turbine engine of claim 13 , wherein a first diameter of the second aperture is greater than a second diameter of the catcher pin.
17. The gas turbine engine of claim 16 , wherein the second aperture is oversized to allow radial movement, with respect to a central axis of the second aperture, of the catcher pin within the second aperture.
18. The gas turbine engine of claim 12 , further comprising a third pin extending from the plate member and configured to be received by an auxiliary component for the gas turbine engine.
19. The gas turbine engine of claim 18 , wherein the third pin extends from the plate member in a direction opposite the fusible guide pin and the catcher pin.
20. An apparatus for mounting an auxiliary component to an engine case of a gas turbine engine, the engine case having a first flange extending circumferentially around the engine case and a second flange extending circumferentially around the engine case, the apparatus comprising:
a support bracket including a first end configured for attachment to the first flange of the engine case and a second end configured for attachment to the second flange of the engine case; and
a locator including a plate member, a fusible guide pin extending from the plate member in a first direction, a catcher pin extending from the plate member in the first direction, and a third pin extending from the plate member in a second direction, opposite the first direction;
wherein the third pin is disposed substantially coaxially with the fusible guide pin, and the support bracket is configured to receive the fusible guide pin and the catcher pin.