Propulsion device for vertical take-off and landing rotary-wing aerodyne, and aerodyne comprising at least one such propulsion device

Abstract

The invention relates to a propulsion device (1) for a vertical take-off and landing rotary-wing aerodyne, by means of coaxial contra-rotating propellers. This device includes a hollow frame (5) and two propellers (2, 3) each having a blade carrier ring (6) carrying the fixed pitch blades (4). Drive means (14) drive in rotation each propeller about its axis of rotation, and tilt control means (22) tilt the propellers about the roll axis (A2) and the pitch axis (A3). The blade carrier ring (6) of each propeller is connected to the drive means (14) by a pin spherical joint (13) connection and the drive means include, for each propeller, a torque motor (14), the rotor (14a) of which is secured to a cage (10) on which is secured the spherical joint (13) on which the blade carrier ring (6) of the respective propeller pivots, the stator (14b) of the torque motor (14) being secured to the frame (5).

Claims

1 . A propulsion device (1) for a vertical take-off and landing rotary-wing aerodyne, by means of coaxial contra-rotating propellers that can move in yaw, roll and pitch, the propulsion device including:-    a hollow frame (5) having a longitudinal axis which, in use, is coaxial with the yaw axis (A1),-    an upper propeller (2) and a lower propeller (3) each having a blade carrier ring (6) to the periphery of which fixed pitch blades (4) are secured or intended to be secured, the propellers (2,3) being spaced one above the other along the yaw axis (A1), each propeller defining a propeller disc and being adapted to be driven in rotation about an axis of rotation that is perpendicular to the propeller disc and to be tilted about the roll axis (A2) and the pitch axis (A3),-    drive means (14) for driving in rotation each propeller (2,3) about its axis of rotation, and-    tilt control means (22) for tilting the propellers about the roll axis (A2) and the pitch axis (A3),-    the blade carrier ring (6) of each propeller being connected to the drive means (14) by a pin spherical joint (13) connection, the centre of which is the intersection of the respective propeller disc and the yaw axis (A1) and the axis of which is the axis of rotation of the propeller,the propulsion device (1) being characterized in that the drive means (14) include motor means including, for each propeller, a torque motor (14), the rotor (14a) of which is secured to a cage (10) on which is secured the spherical joint (13) on which the blade carrier ring (6) of the respective propeller pivots, the stator (14b) of the torque motor (14) being secured to the frame (5). 2 . The propulsion device according to claim 1, characterized in that the cage (10) is rotatably mounted on a tubular support (15) secured to the frame (5). 3 . The propulsion device according to claim 2, characterized in that the frame (5) is divided into two cases (5a,5b) that can be assembled together, each case being associated with a separate propeller, each case (5a,5b) carrying a stator (14b) of a torque motor (14) and a tubular support (15) on which a cage (10) driving a pin spherical joint (13) driving the propeller associated with said case can rotate. 4 . The propulsion device according to claim 3, characterized in that the tilt control means (22) include:-    two pairs (23a, 23b) of control rods (24), of fixed length, located between the propellers, all the rods (24) being parallel to the yaw axis (A1) and the two rods of the same pair (23a,23b) being arranged diametrically opposite each other relative to the yaw axis (A1), -    each rod (24) being movable in translation by a control device, parallel to the yaw axis (A1), in both directions, so that each rod (24) is able to push with one end on a plate (25) that is connected to the blade carrier ring (6) of a propeller (2, 3) so as to make it tilt about the roll axis (A2) for a first pair or about the pitch axis (A3) for a second pair, -    each plate (25) being connected to a blade carrier ring (6) of a propeller by a bearing (26) rotationally disengaging the plate (25) from the blade carrier ring (6) of the respective propeller. 5 . The propulsion device according to claim 4, characterized in that the control device of each rod (24) comprises a nut (29) which is pivotally mounted relative to the frame (5), the rod (24) carrying a thread and being braked or stopped in rotation relative to the frame (5). 6 . The propulsion device according to claim 5, characterized in that the two rods (24) of the same pair (23a, 23b) are driven by the same motorization (32a, 32b) which rotates the two nuts (29) at the same speed by means of a set of gearwheels, wherein the rotation of the two nuts (29) may be in the same direction with the rods being threaded in opposite directions or the rotation of the two nuts (29) may be in opposite directions with the rods being threaded in the same direction. 7 . The propulsion device according to claim 6, characterized in that the sets of gearwheels associated with the two pairs (23a, 23b) of rods (24) are secured to the same bottom plate which forms the bottom (38a) of a first case (5a) and carries pillars (45) forming pivot pins for the gearwheels, the bottom (38b) of the second case (5b) having holes (46) receiving the pillars (45) of the first case (5a), the two sets of gearwheels thus being located in a housing (21) delimited by the two cases (5a, 5b) constituting the frame (5). 8 . The propulsion device according to claim 7, characterized in that the motorizations (32a, 32b) associated with the two pairs (23a, 23b) of rods (24) are each housed in a separate tubular support (15) associated with one of the cases (5a, 5b). 9 . The propulsion device according to claim 4, characterized in that each plate (25) on which the control rods (24) bear is connected by return springs (19) to the case (5a, 5b) carrying the propeller associated with said plate (25). 10 . A vertical take-off and landing rotary-wing aerodyne (D), the propulsion of which is provided by a propulsion device (1), characterized in that the propulsion device (1) is as defined in any one of claims 1 to 9. 

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