US 12,246,820 B2
System and method for controlling the modification of the pitch of the blades of a turbine engine
Jacques Auriol, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 18/261,702
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Mar. 14, 2022, PCT No. PCT/EP2022/056441
§ 371(c)(1), (2) Date Jul. 17, 2023,
PCT Pub. No. WO2022/200088, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2103006 (FR), filed on Mar. 25, 2021.
Prior Publication US 2024/0124126 A1, Apr. 18, 2024
Int. Cl. B64C 11/40 (2006.01); F04D 27/00 (2006.01)
CPC B64C 11/40 (2013.01) [F04D 27/002 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A control system for controlling a pitch modification of blades of a fan of a turbomachine for an aircraft, the turbomachine including a drive shaft extending along a longitudinal axis and adapted to be rotatably driven about said longitudinal axis with respect to a fixed structure of said turbomachine, the blades are radially mounted with respect to said drive shaft and adapted to be oriented at a blade pitch, and an orientation device configured to modify the blade pitch as a function of an axial load applied to said orientation device, the control system comprising:
a hydraulic actuator coupled to the drive shaft to be rotatable therewith, in order to apply the axial load to said orientation device,
a hydraulic pump coupled to the drive shaft to be rotatable therewith and supplying the hydraulic actuator in order to apply the axial load to said orientation device as a function of the flow rate of the hydraulic pump,
a connecting ring gear mounted about said longitudinal axis with respect to the fixed structure of said turbomachine, said connecting ring gear being mechanically connected to the hydraulic pump so that the flow rate of the hydraulic pump is proportional to a relative speed between the drive shaft and the connecting ring gear, and
a magnetic coupling device configured to pilot the drive speed of the connecting ring gear in order to control the blade pitch independently of a speed of the drive shaft.