Mechanical attachment scheme for isogrid ducts
A clamp for securing a component to an isogrid case of a gas turbine engine includes a top having an attachment feature for coupling the clamp to the component. The clamp further includes a bottom. The clamp further includes two sides extending from the top towards the bottom, each of the two sides being thicker at the bottom than at the top, and the two sides defining a shaped slot closer to the bottom than the top for receiving a rib of the isogrid case.
1. A clamp for securing a component to an isogrid case of a gas turbine engine, the clamp comprising:
a top;
an attachment feature disposed at the top, wherein the attachment feature is for coupling the clamp to the component, wherein the attachment feature includes a threaded post coupled to the clamp;
a bottom; and
two sides extending from the top towards the bottom, each of the two sides being thicker at the bottom than at the top, and the two sides defining a shaped slot closer to the bottom than the top for receiving a rib of the isogrid case, the rib having a vertical portion extending at a right angle from a surface of the isogrid case and a horizontal portion extending in a direction parallel to the surface, a right angle being formed between a vertical outer surface of the vertical portion and a horizontal outer surface of the horizontal portion, the shaped slot having a vertical portion having a corresponding shape and dimension of the vertical portion of the rib and a horizontal portion having a corresponding shape and dimension as the horizontal portion of the rib;
wherein each of the two sides defines a lightening hole closer to the bottom than the top and configured to reduce a total weight of the clamp, wherein the lightening holes are disposed between a central opening and the bottom, wherein the central opening is defined between the two sides.
2. The clamp of claim 1 , wherein the vertical portion of the shaped slot is defined between the two sides, and the horizontal portion of the shaped slot is partially defined by a first side of the two sides and partially defined by a second side of the two sides.
3. The clamp of claim 1 , wherein each of the two sides defines a boss for receiving a fastener.
4. The clamp of claim 3 , wherein the boss on at least one of the two sides is threaded.
5. The clamp of claim 1 , wherein the threaded post is formed monolithically with the clamp.
6. The clamp of claim 1 , wherein the clamp is configured to be fastened to the rib of the isogrid case by spreading the two sides apart, placing the shaped slot over the rib, and securing the clamp to the rib using a fastener through the two sides to reduce a likelihood of the two sides separating.
7. The clamp of claim 1 , wherein the rib has a T-shaped cross section.
8. The clamp of claim 1 , wherein the two sides are formed monolithic with the top.
9. The clamp of claim 1 , wherein the shaped slot has a T-shaped cross section.
10. A clamp for securing a component to an isogrid case of a gas turbine engine, the clamp comprising:
a top having an attachment feature for coupling the clamp to the component;
a bottom; and
two sides extending from the top towards the bottom, each of the two sides being thicker at the bottom than at the top, and the two sides defining a shaped slot closer to the bottom than the top for receiving a rib of the isogrid case, the rib having a vertical portion extending at a right angle from a surface of the isogrid case and a horizontal portion extending in a direction parallel to the surface, a right angle being formed between a vertical outer surface of the vertical portion and a horizontal outer surface of the horizontal portion, the shaped slot having a vertical portion having a corresponding shape and dimension of the vertical portion of the rib and a horizontal portion having a corresponding shape and dimension as the horizontal portion of the rib, and each of the two sides defining a boss for receiving a fastener,
wherein each of the two sides defines a lightening hole closer to the bottom than the top and configured to reduce a total weight of the clamp, wherein the lightening holes are disposed between a central opening and the bottom, wherein the central opening is defined between the two sides.
11. The clamp of claim 10 , wherein the boss on at least one of the two sides is threaded.
12. The clamp of claim 10 , wherein the attachment feature includes a threaded post formed monolithically with the clamp or coupled to the clamp.
13. The clamp of claim 10 , wherein the clamp is configured to be fastened to the rib of the isogrid case by spreading the two sides apart, placing the shaped slot over the rib, and securing the clamp to the rib using the fastener through the two sides to reduce a likelihood of the two sides separating.
14. A system for securing components to a gas turbine engine, the system comprising:
an isogrid case having a rib and configured to be coupled to the gas turbine engine; and
a clamp for securing a component to the isogrid case and having:
a top having an attachment feature for coupling the clamp to the component,
a bottom, and
two sides extending from the top towards the bottom, each of the two sides being thicker at the bottom than at the top, and the two sides defining a shaped slot closer to the bottom than the top for receiving the rib of the isogrid case to couple the clamp to the isogrid case, the rib having a vertical portion extending at a right angle from a surface of the isogrid case and a horizontal portion extending in a direction parallel to the surface, a right angle being formed between a vertical outer surface of the vertical portion and a horizontal outer surface of the horizontal portion, the shaped slot having a vertical portion having a corresponding shape and dimension of the vertical portion of the rib and a horizontal portion having a corresponding shape and dimension as the horizontal portion of the rib,
wherein each of the two sides defines a lightening hole closer to the bottom than the top and configured to reduce a total weight of the clamp, wherein the lightening holes are disposed between a central opening and the bottom, wherein the central opening is defined between the two sides.
15. The system of claim 14 , wherein the vertical portion of the shaped slot is defined between the two sides, and the horizontal portion of the shaped slot is partially defined by a first side of the two sides and partially defined by a second side of the two sides.
16. The system of claim 14 , wherein each of the two sides defines a boss for receiving a fastener, and wherein the boss on at least one of the two sides is threaded.