US 11,753,948 B2
Woven fibrous preform for producing a composite part, especially a turbomachine blade
Yann Didier Simon Marchal, Moissy-Cramayel (FR); and Dominique Marie Christian Coupe, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR)
Appl. No. 17/770,537
Filed by SAFRAN, Paris (FR)
PCT Filed Oct. 23, 2020, PCT No. PCT/FR2020/051923
§ 371(c)(1), (2) Date Apr. 20, 2022,
PCT Pub. No. WO2021/084192, PCT Pub. Date May 6, 2021.
Claims priority of application No. 1912135 (FR), filed on Oct. 29, 2019.
Prior Publication US 2022/0372882 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F01D 5/28 (2006.01); B29B 11/16 (2006.01); B29C 70/24 (2006.01); D03D 1/00 (2006.01); D03D 25/00 (2006.01)
CPC F01D 5/282 (2013.01) [B29B 11/16 (2013.01); B29C 70/24 (2013.01); D03D 1/00 (2013.01); D03D 25/005 (2013.01); F05D 2300/614 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fibrous preform for forming a fibrous reinforcement of a composite material part with the fibrous reinforcement densified by a matrix, the fibrous preform being made as a single piece and obtained by three-dimensional weaving of a plurality of longitudinal threads or strands, extending in a direction corresponding to the longitudinal direction of the part with a plurality of transverse threads or strands, the preform comprising a first skin, a second skin and a central portion connecting the first skin to the second skin, the central portion being intended to form a stiffening element of the part in the longitudinal direction, wherein, in a transverse plane of the preform:
transverse threads or strands of the first skin and of the second skin are woven in pairs in the first skin and in the second skin on either side of the central portion,
the threads or strands of at least a first pair of transverse threads or strands of the first skin are separated into two unitary threads or strands at the central portion, said unitary threads or strands being separately woven with the longitudinal threads or strands in said central portion,
the threads or strands of at least one second pair of transverse threads or strands of the second skin are separated into two unitary threads or strands at the central portion, said unitary threads or strands being separately woven with the longitudinal threads or strands in said central portion, and
at least one thread or strand of the first pair and at least one thread or strand of the second pair cross at least twice in the central portion.