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A steering section for guided munition comprises a steering body having n control surfaces folded inside or deployed protruding from the external surface. The steering section comprises a locking mechanism for the n control surfaces folded inside the steering body having a lock support secured there

A steering section for guided munition comprises a steering body having n control surfaces folded inside or deployed protruding from the external surface. The steering section comprises a locking mechanism for the n control surfaces folded inside the steering body having a lock support secured thereto, a fixed sleeve secured to the lock support comprising a locking barrel, a mobile sleeve surrounding the fixed sleeve and slideable longitudinally along the locking barrel, the mobile sleeve comprising, on the outside of the fixed sleeve, a free end collaborating with the n control surfaces to keep them folded inside the steering body, a translational-locking device locking the translational movement along the mobile sleeve along the locking barrel deactivatable by unlocking force to trigger translational sliding movement of the mobile sleeve along the locking barrel and release the n control surfaces which can then move from their folded position into their deployed position.

대표청구항 ▼

1. A steering section for a guided munition, the steering section comprising: a steering body comprising: an external surface of cylindrical shape about a longitudinal axis XX′, andn control surfaces Gn around the longitudinal axis XX′, the n control surfaces Gn being in a folded position folded ins

1. A steering section for a guided munition, the steering section comprising: a steering body comprising: an external surface of cylindrical shape about a longitudinal axis XX′, andn control surfaces Gn around the longitudinal axis XX′, the n control surfaces Gn being in a folded position folded inside the steering body or in a deployed position protruding from the external surface of the steering body to guide the munition, n being a whole number greater than 1,a locking mechanism configured to lock the n control surfaces Gn when in the folded position inside the steering body, said locking mechanism comprising: a lock support comprising a first tube secured at one end to the steering body, the first tube having an axis of revolution AA′ coincident with the longitudinal axis XX′, the first tube being closed at an end nearest the n control surfaces Gn by a lock wall comprising a lock opening along the axis of revolution AA′, the lock opening having a diameter D2 that is less than an inner diameter D1 of the first tube of the lock support, the lock wall forming an annulus-shaped bearing surface within the lock support,a fixed sleeve having a cylindrical shape about the axis of revolution AA′ coinciding with the longitudinal axis XX′, the fixed sleeve comprising a fixing annulus in a plane perpendicular to the axis of revolution AA′ that is secured to the lock support at an end opposite the end closed by the lock wall,a locking barrel comprising a second tube of circular cross section having an outside diameter D3 passing through the lock opening and comprising a free edge outside the lock support,a mobile sleeve comprising a third tube having a circular cross section and an external diameter D4 surrounding the fixed sleeve, the mobile sleeve being configured to slide longitudinally along the axis of revolution AA′ along an external surface of the locking barrel, the mobile sleeve comprising a free end, at the closed end of the first tube nearest the n control surfaces Gn on the outside of the fixed sleeve, collaborating with the n control surfaces Gn to keep the n control surfaces Gn in the folded position inside the steering body and comprising another end, opposite to the free end inside the lock support, comprising a flange of diameter D5 greater than the external diameter D4 of the mobile sleeve,a translational-locking device configured to lock the longitudinal movement along the axis of revolution AA′ of the mobile sleeve on the locking barrel, the translational-locking device configured to be deactivated by an unlocking force F to trigger a sliding longitudinal movement of the mobile sleeve on the locking barrel and release of the n control surfaces Gn that move from the folded position into the deployed position, andan unlocking helical spring around the mobile sleeve, the unlocking helical spring configured to cause the mobile sleeve to slide on the fixed sleeve when the locking device is deactivated. 2. The steering section according to claim 1, wherein the locking barrel comprises, in a central part between the two ends of the locking barrel, an internal wall in a plane perpendicular to the axis of revolution AA′, the internal wall comprising a circular passage of axis coincident with the axis of revolution AA′ to form, between each end of the locking barrel and the internal wall, a cavity of circular cross section comprising a mobile part of the locking device. 3. The steering section according to claim 2, wherein the mobile part of the locking device comprises, between the free edge and an internal wall of the locking barrel, a return spring compressed by a locking piston, the locking piston comprising a first piston surface of diameter D6 that is configured to slide within the locking barrel, the first piston surface being connected by an intermediate surface of frustoconical shape to a second piston surface of diameter D7 that is smaller than the diameter D6 of the first surface of the locking piston. 4. The steering section according to claim 3, wherein the translational-locking device comprises: blocking holes in a circular wall of the locking barrel, the blocking holes being evenly distributed about the axis of revolution AA′ in a plane perpendicular to the axis of revolution AA′,blocking balls inserted in the blocking holes, the blocking balls each having a diameter greater than the thickness of the circular wall of the locking barrel, anda groove on a side of an internal surface of the mobile sleeve,wherein, when the locking mechanism is in a locked position, the blocking balls inserted in the blocking holes of the circular wall of the locking barrel in contact with the first piston surface of diameter D6 are inserted partially into the groove of the mobile sleeve blocking the mobile sleeve against longitudinal movement along the fixed sleeve. 5. The steering section according to claim 4, wherein, when the locking mechanism is in the locked position, the unlocking helical spring is compressed between the flange of the mobile sleeve and the lock wall of the lock support, and the unlocking helical spring, on relaxing upon deactivation of the locking device, brings the free end of the mobile sleeve closer to the fixed sleeve. 6. The steering section according to claim 4, wherein, when the locking mechanism is in the locked position, the unlocking helical spring is compressed between the flange of the mobile sleeve and the fixing annulus of the fixed sleeve, and the unlocking helical spring, on relaxing upon deactivation of the locking device, moves the free end of the mobile sleeve further away from the fixed sleeve. 7. The steering section according to claim 4, wherein the locking piston of the mobile part comprises, at the same end of the circular passage of the internal wall of the locking barrel, an application surface on which the unlocking force F acts to compress the return spring and, during a first phase of unlocking of the locking mechanism, applies the second surface of diameter D7 of the locking piston facing the blocking balls which, on withdrawing from the groove of the internal surface of the mobile sleeve, allow the mobile sleeve a longitudinal movement along the locking barrel through relaxation of the unlocking helical spring, in a last unlocking phase, releasing the n control surfaces Gn to allow the n control surfaces Gn to pass from the folded position into the deployed position. 8. The steering section according to claim 7, wherein the locking barrel comprises another cavity between the internal wall of the locking barrel and the fixing annulus secured to the lock support, the other cavity configured to be opened via the fixing annulus comprising a device configured to generate the unlocking force F, the device configured to generate the unlocking force F being secured to the steering body. 9. The steering section according to claim 8, wherein the device configured to generate the unlocking force F is a pyrotechnic device. 10. The steering section according to claim 9, wherein the pyrotechnic device comprises a pyrotechnic tube having a circular cross section having a diameter D8, the pyrotechnic tube configured to slide in the other cavity, the pyrotechnic tube being closed, at the same end as the internal wall of the locking barrel, by a pyrotechnic tube wall comprising a circular opening having a diameter D9, and at the other end of the pyrotechnic tube by another closure wall of circular cross section having a diameter D10 that is greater than the diameter D8 of the pyrotechnic tube. 11. The steering section according to claim 10, wherein the other closure wall of the pyrotechnic device is extended by a cylindrical body having a diameter D12 that is less than the diameter D10 of the other closure wall to create an annulus-shaped bearing surface for a clamping ring, the clamping ring comprising a threaded periphery and comprising a passage through the clamping ring, for passage of the cylindrical body of the pyrotechnic device. 12. The steering section according to claim 11, wherein the pyrotechnic tube comprises: a pyrotechnic piston, between the pyrotechnic tube wall comprising the circular opening and the other closure wall, configured to slide in a fluid-tight manner inside the pyrotechnic tube, the pyrotechnic piston reducing in diameter to pass through the circular opening in the wall of the pyrotechnic tube,an igniter and a pyrotechnic charge forming, with the pyrotechnic piston, a pyrotechnic chamber, andan O-ring seal surrounding the pyrotechnic piston, the O-ring ensuring that the pyrotechnic chamber is fluid-tight. 13. The steering section according to claim 12, wherein the pyrotechnic piston is in contact, via the application surface on which the unlocking force F acts, with the locking piston in the locking barrel of the fixed sleeve, such that the locking piston is not in direct contact with the internal wall of the locking barrel, and wherein the pressure of the contact between the locking piston and the pyrotechnic piston of the pyrotechnic device is applied by the return spring compressed between the closure ring secured to the free end of the locking barrel and the locking piston. 14. The steering section according to claim 8, wherein the device configured to generate the unlocking force F is an electromagnetic device. 15. The steering section according to claim 8, wherein the device configured to generate the unlocking force F is a pneumatic device. 16. A tool for resetting the locking of the locking mechanism of the steering section according to claim 5, wherein, when the unlocking helical spring between the flange of the mobile sleeve and the lock wall of the lock support is relaxed and the flange of the mobile sleeve is in abutment against an internal shoulder of the fixing annulus of the fixed sleeve, a blocking mechanism comprising a series of holes, each having an axes parallel to the longitudinal axis XX′, passing through the fixing annulus of the fixed sleeve and distributed evenly about the axis of revolution AA′ and opening in the region of the flange of the mobile sleeve, said tool comprising: a handle comprising cylindrical rods secured to the handle and distributed on the handle such that when a rod enters a respective hole of the fixing annulus, pressure applied to the handle and transmitted via the cylindrical rods to the flange compresses the unlocking helical spring to reset the locking device. 17. The tool according to claim 6, wherein, when the unlocking helical spring has relaxed between the flange of the mobile sleeve and the fixing annulus of the fixed sleeve, the flange of the mobile sleeve comprises a series of threaded holes each having an axes parallel to the longitudinal axis XX′ and distributed evenly about the axis of revolution AA′, said tool further comprising: a handle comprising cylindrical rods secured by one end to the handle, another free end of the cylindrical rods being threaded to be screwed into the threaded holes of the flange of the mobile sleeve and secured to the handle, a pulling force being applied to the handle to bring the mobile sleeve back towards the fixing annulus, which compresses the unlocking helical spring to reset the locking device. 18. A guided munition, comprising: the steering section according to claim 1.