Device for controlling the pitch of fan blades of a turboprop

A device for controlling pitch of fan blades of a turboprop including at least one set of adjustable-pitch fan blades, the set being secured to rotate with a rotary ring centered on a longitudinal axis and mechanically connected to a turbine rotor, each blade of the set being coupled for pitch adjustment to a synchronization ring centered on the longitudinal axis, the device comprising:

• a rolling bearing including an inner cage slidably mounted on a turbine casing and connected to the rod of an actuator centered on the longitudinal axis;
• and
• an outer cage that is mechanically connected to the synchronization ring by a plurality of connection arms connected to the actuator rod and hinge-mounted on the synchronization ring such that actuating the actuator causes the synchronization ring to move in turning about the longitudinal axis.