Pitch actuation system for a turbomachine propeller

A pitch actuation system for a turbomachine propeller, comprising:

• an actuator having a movable portion configured to be connected to blades of the propeller in order to rotate the blades relative to blade-pitch setting axes, wherein the actuator is an electromechanical actuator, and comprises:
• a blade-pitch control comprising at least one electric motor arranged to drive a rotor about an axis, and a transmission screw arranged to be driven in rotation about the axis by said rotor;
• a nut through which said transmission screw passes and cooperating with the screw so as to move in translation along the axis;
• a member movable both in translation along the axis and in rotation about the axis, the member configured to cooperate with the blades in order to move the blades,
• wherein the nut is connected to the movable member such that a translational movement of the nut causes translational movement of the member but a rotational movement of the member does not cause rotational movement of the nut, and
• wherein the system further comprises decoupling means for operatively associating the nut with the member, wherein said decoupling means comprise at least one ring and two angular contact roller bearings, a first angular contact bearing being mounted between the ring and the nut and a second angular contact bearing being mounted between the ring and the member.