System of counter-rotating propellers that have a device for flagging the propeller blades

摘要

Counter-rotating propeller system (1) for turbo-aircraft machine, including a first and second propellers (6, 8) centered on a longitudinal axis (4), said first propeller (6) includes a first propeller rotor (18) intended to rotate in a first direction, rotation (12) around the longitudinal axis with respect to a stator (2) of this propeller system, and carrying first blades (6a), said first propeller also including a first draft control system (26) of the first blades, allowing the latter to move between a minimum incidence position and a maximum incidence position, said draft control system including a first sliding organ (28) along the longitudinal axis, cooperating with said first blades so that their displacement according to a first sliding direction (32a) leads said first blades to approximate their minimum incidence position, and so that their displacement according to a second sense of d Sliding (32b) opposite the first leads to said first blades to approximate the assumption of maximum incidence, said first sliding organ being controlled by first rotating actuation means (38), whose rotational movement around the longitudinal axis induces a sliding movement of said first organ along the same axis, said draft control system further including a first motor (40) allowing said rotary motion to be applied to said first rotary drive means, said first sliding member and first rotating drive means are rotatably driven by said first rotor in said first rotor direction of rotation, in front of the stator, said second propeller (8) includes a second propeller rotor (48) intended to rotate in a second direction of rotation (14) opposite the first, about the longitudinal axis relative to the stator of this propeller system, and that has some second blades (8a), said The second propeller also includes a second draft control system (56) of the second blades, allowing the latter to move between a minimum incision position and a maximum incidence position, said draft control system includes a second sliding organ (58) along the axis longitudinally, cooperating with said second blades so that their displacement according to a third direction of sliding (62a) leads said second blades to approximate their position of minimum incidence, and so that their displacement according to a fourth direction of sliding (62b) opposite the third leads to said second blades to approximate their position of maximum incidence, said second sliding member being controlled by a second rotating means of actuation (68), whose rotational movement around the longitudinal axis induces a sliding movement of said second organ along the same axis, said Decayed control system also includes a second motor (70) which allows said rotary movement to be applied to said second rotary drive means, said second sliding member and second rotating drive means being rotated in rotation by said second rotor in said second direction of rotation, in front of the stator, characterized in that said system of counter-rotating propellers also includes disengaging means (72) that allow said first and second rotational actuation means (38,68) to be made in rotation, said propeller system being conceived so that when these disengagable means are engaged, two speeds of relative rotation respectively by a part between said first sliding member (28), dragged in rotation by said first rotor, and its first associated rotating actuating means (38), and on the other hand between said second sliding member (58), dragged in rotation by said second rotor , and its associated second rotating actuating means (68), each of the first and second sliding organs being driven to move respectively in the first direction of sliding and said third direction of sliding, carrying said first and second blades (6a, 6b) to Your minimum incidence position.