US 12,247,498 B2
System for changing the pitch of the blades of a turbomachine propeller
Christophe Marcel Lucien Perdrigeon, Moissy-Cramayel (FR); and Clement Cottet, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 18/570,342
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Jun. 13, 2022, PCT No. PCT/FR2022/051114
§ 371(c)(1), (2) Date Dec. 14, 2023,
PCT Pub. No. WO2022/263753, PCT Pub. Date Dec. 22, 2022.
Claims priority of application No. 2106337 (FR), filed on Jun. 15, 2021.
Prior Publication US 2024/0218800 A1, Jul. 4, 2024
Int. Cl. F01D 7/00 (2006.01); B64C 11/32 (2006.01); F01D 9/04 (2006.01)
CPC F01D 7/00 (2013.01) [B64C 11/32 (2013.01); F01D 9/041 (2013.01); F05D 2260/50 (2013.01); F05D 2260/70 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A system for changing a pitch of blades of a propeller of a turbomachine, each blade being mounted to pivot about a pitch axis, the system comprising a control means and a connection mechanism connecting the control means to each blade of the propeller, the connection mechanism comprising, for each blade of the propeller:
a link having a first end connected to the control means; and
an eccentric having a first end connected to each blade to drive each blade in rotation about the pitch axis of each blade and a second end forming a yoke connected to a second end of the link by a pivot connection via a hinge axis;
wherein the yoke of the eccentric is U-shaped to receive the hinge axis of the pivot connection and comprises two arms connected by a central portion and an open portion opposite the central portion and the open portion being defined between free ends of the two arms, the central portion being further away from the pitch axis than the open portion of the yoke so that the hinge axis of the pivot connection is arranged between the central portion of the yoke and the pitch axis and such that the yoke of the eccentric is oriented towards the pitch axis of each blade.