Unducted rectifier for a turbomachine, turbomachine module and aircraft turbomachine

An unducted flow straightener for a turbomachine having a longitudinal axis, the flow straightener comprising:

• a plurality of stator vanes extending along a radial axis, each stator vane comprising a root and a blade rising radially from the root, the root having two half-platforms extending on either side of the blade;
• a plurality of pivots, each associated with a stator vane and pivotally mounted along a pitch axis and configured to connect to a pitch change system for changing the pitch of the blades, each pivot having an upper platform and a cylindrical lower portion;
• and
• a plurality of attachment systems, each associated with a stator vane and being adapted to attach the half-platforms of the root of the vane to the associated pivot, each attachment system comprising a clamping system and two plates arranged on either side of the blade, each of the plates having a shape identical to each half-platform, the clamping system being designed to clamp the half-platforms of the root of the vane between the plates of the attachment system and the upper platform of the pivot,
• wherein each half-platform of a root of a vane has at least two through-orifices, each upper platform of a pivot associated with the root of the vane has through-holes each arranged opposite a through-orifice of a half-platform, and each plate of an attachment system associated with a root of the vane has through holes each arranged opposite a through orifice of a half-platform,
• wherein the clamping system comprises screws and rotation-stop means arranged to clamp the half-platforms of the root of the vane between the plates of the attachment system and the upper platform of the pivot, each screw being inserted successively into a through hole in a plate of the attachment system, an orifice in a half-platform, a through hole in the pivot, and the rotation-stop means,
• wherein each lower portion of a pivot comprises a body and a segment of larger diameter than the body arranged between the body and the upper platform, and
• wherein each rotation-stop means of a clamping system comprises a flattened area coming in abutment against the segment of larger diameter.