Patent ID: 7273346
Filing Date: 2007-09-25
Classification: F01D,F04D,F05D

Abstract:
1. A control system for controlling two stages of variable-pitch stator vanes in a turbomachine, each stage including a plurality of vanes each pivotally mounted on a casing of the turbomachine, and a control ring for each stage surrounding the casing and connected to each of the vanes of the stage via respective levers, the control system including a drive element for turning a first control ring of one of the stages via a leader member pivotally mounted on the casing, and a synchronization bar for transmitting the turning movement of the first control ring driven by the drive element to a second control ring of the other stage via a follower member pivotally mounted on the casing, the system further comprising an additional pivot member interposed between the follower member and the second control ring, said additional pivot member being pivotally mounted on the follower member and being connected to the casing by a wheel sliding in a slot secured to the casing.