An active aerodynamic device configured to equip motor vehicles, comprising a frame supporting uprights between which are articulated in rotation about an axis (a 0 a' 0, a 1 a' 1, b 0 b' 0, b 1 b' 1), between an open position and a closed position, - at least two sets of flaps (2, 3) that are transversely juxtaposed, the axes of rotation (a 0 a' 0, a 1 a' 1) of one of the sets of flaps being parallel to each other and coplanar in pairs with the axes of an adjacent set of flaps (b 0 b' 0, b 1 b' 1) and the coplanar axes of rotation (a 0 a' 0, a 1 a' 1 and b 0 b' 0, b 1 b' 1) of two adjacent sets of flaps (2, 3) forming a given non-zero angle (α) between them, wherein, - each flap (20, 21, 30, 31) comprises, at at least one of its lateral ends, a connecting rod (200, 210, 300, 310), a first end (201, 211, 301, 311) of which forms a fixed connection coaxial with the axis of the flap and a second end (202, 212, 302, 312) of which forms an annular linear connection with a force transfer member for transmitting the movement of a set of driving flaps to an adjacent set of follower flaps, - said force transfer member comprises guide means (42, 420, 421, 424, 423) forming, with a slide arranged on the upright separating the two adjacent sets of flaps (2, 3), at least two bilateral rectilinear linear connections, said slideway being oriented so that, when the flaps (20, 21, 30, 31) are rotated, any point on the force transfer member moves in a fixed plane, describing an arc of a circle, - characterized in that the second end (202, 212, 302, 312) of a connecting rod (200, 210, 300, 310) comprises a spherical head penetrating into a hollow cylinder (401, 402, 403, 404) provided in the force transfer member to form an annular linear connection. - at least two sets of flaps (2, 3) that are transversely juxtaposed, the axes of rotation (a 0 a' 0, a 1 a' 1) of one of the sets of flaps being parallel to each other and coplanar in pairs with the axes of an adjacent set of flaps (b 0 b' 0, b 1 b' 1) and the coplanar axes of rotation (a 0 a' 0, a 1 a' 1 and b 0 b' 0, b 1 b' 1) of two adjacent sets of flaps (2, 3) forming a given non-zero angle (α) between them, - each flap (20, 21, 30, 31) comprises, at at least one of its lateral ends, a connecting rod (200, 210, 300, 310), a first end (201, 211, 301, 311) of which forms a fixed connection coaxial with the axis of the flap and a second end (202, 212, 302, 312) of which forms an annular linear connection with a force transfer member for transmitting the movement of a set of driving flaps to an adjacent set of follower flaps, - said force transfer member comprises guide means (42, 420, 421, 424, 423) forming, with a slide arranged on the upright separating the two adjacent sets of flaps (2, 3), at least two bilateral rectilinear linear connections, said slideway being oriented so that, when the flaps (20, 21, 30, 31) are rotated, any point on the force transfer member moves in a fixed plane, describing an arc of a circle, - characterized in that the second end (202, 212, 302, 312) of a connecting rod (200, 210, 300, 310) comprises a spherical head penetrating into a hollow cylinder (401, 402, 403, 404) provided in the force transfer member to form an annular linear connection.