Pitch-change mechanism with pitch-locking device comprising a satellite roller screw

A pitch change mechanism for adjusting an angular position of at least one variable-setting blade about a pivot axis of the variable-setting blade, said pitch change mechanism comprising:

• a frame fixed relative to the pivot axis,
• a control actuator including a fixed part secured to the frame and a moving part movable in translation along a longitudinal axis relative to the fixed part,
• a link system linking the moving part to the variable-setting blade so as to convert a translation of the moving part relative to the fixed part along the longitudinal axis into a rotation of the variable-setting blade about the pivot axis, and
• a pitch locking device capable of blocking the translation of the moving part relative to the fixed part in at least one way,
• the pitch locking device comprising:
• a support member, movable in translation relative to the frame along the longitudinal axis between an operating position and a locking position,
• a biasing device biasing the support member towards its locking position,
• a holding device for holding the support member in its operating position under normal operating conditions, and
• a screw-nut system with:
• a screw secured in translation to the support member and movably mounted in rotation about the longitudinal axis relative to the support member, the screw having an abutment surface which is at a distance from the frame when the support member is in the operating position and bearing against the frame when the support member is in the locking position, and
• a nut secured to the moving part and coaxial with the screw, the nut cooperating with the screw so that a translation of the nut along the longitudinal axis causes rotation of the screw about the longitudinal axis,
• wherein the screw-nut system is formed by a satellite roller screw system.