Turbo engine with propeller(s) for an aircraft with a system for changing the pitch of the propeller

A turbine engine with at least one propeller for an aircraft, comprising:

• a system for changing a pitch of vanes of the propeller, the system comprising
• an annular actuator with linear control connected to a fixed housing supporting the propeller, and
• a linking mechanism linking the annular actuator to the vanes of the propeller to change an orientation of the vanes, the linking mechanism comprising an intermediate transfer bearing fixed, on a first side, to a movable part of the annular actuator and cooperating, on a second side, with linking means able to link the linking mechanism to the vanes of the propeller, so that the intermediate transfer bearing of the linking mechanism driven in rotation transfers translational displacement of the movable part of the annular actuator to the linking means to change the orientation of the vanes of the propeller,
• wherein the fixed housing is inside the propeller and close to a longitudinal axis of the turbine engine, opposed to the vanes mounted in an outer rotary hub of the propeller,
• wherein the linking means comprises a set of connecting rods distributed around the annular actuator and linked, on a first side, to the intermediate transfer bearing and, on a second side, to radial rotary shafts that are respectively integral with roots of the vanes of the propeller to drive, following translational displacement of the connecting rods of the linking mechanism, rotation of the radial rotary shafts and the associated vanes,
• wherein a first end of the connecting rods are articulated to a ring of the linking means which is rotationally linked to a rotary cylindrical wall of the propeller and which is axially free from the rotary cylindrical wall, and a second end of the connecting rods are articulated by pivot links to transverse journals provided on the radial rotary shafts of the vanes, each radial rotary shaft being provided with one single transverse journal,
• wherein each transverse journal defines a single lever arm with a first end pivotally connected by said pivot link to the second end of one of the connecting rods and a second end connected to an end of the radial rotary shafts such that each transverse journal pivots with one of the radial rotary shafts about an axis of the one of the radial rotary shafts, and
• wherein the first end of the lever arms of the transverse journals is further upstream than the second end of the lever arms of the transverse journals in a first position of the movable part of the annular actuator, and the second end of the lever arms of the transverse journals is further upstream than the first end of the lever arms of the transverse journals in a second position of the movable part of the annular actuator.