Patent ID: 7393178
Filing Date: 2008-07-01
Classification: F01D,F04D,Y02T

Abstract:
1. A variable-pitch stator vane stage comprising vanes arranged in a casing, said vanes being moved by a drive system comprising an actuator ring outside said casing and carried thereby, with said actuator ring being connected to the vanes of said stage by cranks in order to actuate them simultaneously, wherein said actuator ring is constrained to move in rotation only, centered on the axis of said turbomachine, said drive system comprises two coaxial portions, an inner portion secured to the casing and an outer portion comprising said actuator ring that is connected to said cranks, and that is guided in rotation about said inner portion, and wherein at least one electrical drive unit is arranged between the two portions, wherein said outer portion and said actuator ring move together relative to said inner portion and said casing.