Patent ID: 11959400
Assignee: SAFRAN AIRCRAFT ENGINES
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  F  Y | IPC F

Claim 0:
1. A fan rotor provided with variable pitch blades, this rotor comprising a rotor disc provided at the periphery of the rotor disc with a plurality of fasteners, each fastener being rotatably mounted relative to said rotor disc around a radial pitch axis and each fastener comprising a cell for receiving a blade root of one of said variable pitch blades, an elongated wedge being arranged in each cell,
wherein a central portion of the blade root has a recess, wherein the blade root is arranged in the cell so that the recess of the blade root is oriented toward a bottom of the cell,
wherein a prestressing rod with at least one cam is also arranged in each cell,
wherein the wedge is made of an elastically deformable material, wherein the wedge has at least one longitudinal section which has a transverse profile in the form of an arc, a central region of which is curved, so that it comprises a domed portion protruding in a direction of a concavity of said arc and a hollow in a direction of a convexity of the arc, wherein the wedge is arranged in the cell so that the domed portion of the wedge faces the recess of the blade root and that the hollow of the wedge is oriented toward the bottom of the cell,
wherein the bottom of said cell comprises at least one retraction cavity, there being as many retraction cavities as the rod has cams,
wherein the prestressing rod is interposed between the hollow of the central region of the wedge and the bottom of the cell, so that the at least one cam faces the at least one retraction cavity, and wherein the prestressing rod is movable in rotation around the longitudinal axis of the prestressing rod, so as to be able to be moved between a resting position, in which the at least one cam is housed in the at least one retraction cavity, and an armed position, in which the at least one cam exerts a radial pressure on the central region of the wedge so as to move the wedge in the direction of the blade root and so that two lateral regions of the wedge, arranged on either side of the central region of the wedge, are in contact with corresponding lateral regions of the blade root and are remote from the bottom of the cell.