US 12,215,603 B2
CMC airfoil with wishbone shaped fiber layup structure forming portion of platform and root
Marcus DeReimer, Stuart, FL (US); and Michael G. McCaffrey, Windsor, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by RTX CORPORATION, Farmington, CT (US)
Filed on Jun. 23, 2023, as Appl. No. 18/340,205.
Prior Publication US 2024/0426219 A1, Dec. 26, 2024
Int. Cl. F01D 5/28 (2006.01); F02C 7/00 (2006.01)
CPC F01D 5/282 (2013.01) [F02C 7/00 (2013.01); F05D 2300/6033 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An airfoil comprising:
a ceramic matrix composite (CMC) airfoil wall defining a platform, a root extending radially from the platform, and an airfoil section extending radially from the platform opposite the root, the CMC airfoil wall including first and second wishbone-shaped fiber layup structures,
each of the first and second wishbone-shaped fiber layup structures including:
first and second arms that merge into a single leg,
the first and second arms being comprised of a network of fiber tows,
the single leg including fiber tows from each of the first and second arms that are interwoven in the single leg, the single leg forming a portion of the root, and
the first and second arms extending in opposite directions from the single leg and forming a portion of the platform, wherein
the first arm of the first wishbone-shaped fiber layup structure extending axially forwardly from the single leg of the first wishbone-shaped fiber layup structure, and the first arm of the second wishbone-shaped fiber layup structure extends axially aftly from the single leg of the second wishbone-shaped fiber layup structure,
the second arm of the first wishbone-shaped fiber layup structure extends axially aftly from the single leg of the first wishbone-shaped fiber layup structure, and the second arm of the second wishbone-shaped fiber layup structure extends axially forwardly from the single leg of the second wishbone-shaped fiber layup structure, and
a tip of the second arm of the first wishbone-shaped fiber layup structure is adjacent a tip of the second arm of the second wishbone-shaped fiber layup structure to define a gap therebetween.