Patent ID: 8864470
Filing Date: 2014-10-21
Classification: B64C,B64D,F01D,F02C,F04D,F05D,Y02T

Abstract:
1. A turbomachine comprising: at least one unducted propeller of variable pitch blades, the blades being carried by substantially cylindrical plates mounted to pivot about their respective axes in radial housings of an annular rotor element and connected via their radially inner ends to a control ring that is driven in rotation about the axis of the turbomachine together with a rotor element, and that is movable in translation along the axis to cause the plates to pivot about their respective axes, the control ring being centered and guided in rotation about the axis of the turbomachine on means for centering and guiding the control ring that is stationary in rotation and movable in translation along the axis by an actuator carried by a stator of the turbomachine, wherein the means for centering and guiding the control ring comprises an annular rail of substantially U-shaped section that extends around the axis of the turbomachine and that comprises two side walls that define between them an annular groove that is outwardly open, and in which the control ring is engaged, and further comprising rolling means being mounted on either side of the control ring between the ring and the side walls of the rail.