US 12,485,627 B2
Propeller blade or airfoil with hollow composite root
Pierre Jean Faivre D′Arcier, Moissy Cramayel (FR); Clément Pierre Postec, Moissy Cramayel (FR); Vincent Lionel René Maison, Moissy Cramayel (FR); and Mattéo Minervino, Moissy Cramayel (FR)
Assigned to SAFRAN, Paris (FR); and SAFRAN SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 18/859,818
Filed by SAFRAN, Paris (FR); and SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Apr. 25, 2023, PCT No. PCT/FR2023/000054
§ 371(c)(1), (2) Date Oct. 24, 2024,
PCT Pub. No. WO2023/209289, PCT Pub. Date Nov. 2, 2023.
Claims priority of application No. 2203868 (FR), filed on Apr. 26, 2022.
Prior Publication US 2025/0108569 A1, Apr. 3, 2025
Int. Cl. B29C 70/24 (2006.01); B29B 11/16 (2006.01); B29C 70/48 (2006.01); B29C 70/86 (2006.01); B29L 31/08 (2006.01); B64F 5/10 (2017.01)
CPC B29C 70/24 (2013.01) [B29C 70/48 (2013.01); B29C 70/86 (2013.01); B29L 2031/087 (2013.01)] 11 Claims
OG exemplary drawing
 
6. A propeller blade or airfoil, of a turboprop engine, of composite material comprising a fibrous reinforcement densified by a matrix, the propeller blade or airfoil including, in a span direction, a root and an aerodynamic profile, the fibrous reinforcement comprising a fibrous preform having a three-dimensional weave with a root preform portion present in the root and an aerodynamic profile preform portion present in the aerodynamic profile, the root preform portion extending, in the span direction of the propeller blade or airfoil, outside the aerodynamic profile preform portion from a bottom end of said aerodynamic profile preform portion and recessed, in a chord direction of the propeller blade or airfoil, from a leading edge portion and a trailing edge portion of said aerodynamic profile preform portion, the root and aerodynamic profile preform portions being linked to one another by the three-dimensional weave, wherein the root preform portion of the fibrous preform comprises an unlinked area delimiting an internal root recess forming a cavity opening at a free end of the root, the unlinked area extending in a transverse direction between a first and a second linking portion.