Projectile with steerable control surfaces

A projectile with incidence steerable control surfaces, the projectile comprising at least two control surfaces, each control surface being pivotable with respect to the projectile around a pivot axis perpendicular to a longitudinal axis of the projectile, the projectile further comprising:

• central control means for controlling the control surfaces, the central control means comprising at least one spherical form a center of which is located on the longitudinal axis, said at least one spherical form being arranged in a housing of the projectile,
• a control arm integral with said at least one spherical form and adapted to rotate said at least one spherical form at least around pitch and yaw axes of the projectile passing through the center of said at least one spherical form,
• for each control surface, a transmission member cooperating with said at least one spherical form by a first side and with a foot of said each control surface by a second side, the transmission member being intended to transmit to said each control surface the rotation movements of the spherical form around the pivot axis of the control surface,
• positioning means for positioning the arm, the positioning means being adapted to position one end of the arm in a position determined with respect to an absolute reference frame centered on the longitudinal axis of the projectile, wherein:
• the positioning means comprises a cone movable in translation along the longitudinal axis of the projectile between a first, so-called neutral, position and a second, so-called piloting, position in which the cone pushes a ramp carried by a first end of the control arm so as to pivot the central control means around a so-called orientation axis passing through the center of the central control means,
• the central control means is freely rotatable around the longitudinal axis of the control arm,
• the positioning means comprises a toothed wheel centered on the longitudinal axis of the projectile and connected to a second end of the arm by a sliding connection located in the plane of the toothed wheel and perpendicular to the orientation axis, the toothed wheel meshing with a motorization intended to pilot the angular position of the orientation axis in an absolute reference frame.