EP4008992B1 - Spin-stabilised projectile - Google Patents

Spin-stabilised projectile Download PDF

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Publication number
EP4008992B1
EP4008992B1 EP21210418.6A EP21210418A EP4008992B1 EP 4008992 B1 EP4008992 B1 EP 4008992B1 EP 21210418 A EP21210418 A EP 21210418A EP 4008992 B1 EP4008992 B1 EP 4008992B1
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EP
European Patent Office
Prior art keywords
projectile
cup
piston
sectors
longitudinal axis
Prior art date
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Active
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EP21210418.6A
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German (de)
French (fr)
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EP4008992A1 (en
Inventor
Anthony Forge
Sylvain Jayet
Nicolas Caillaut
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Nexter Munitions SA
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Nexter Munitions SA
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Publication of EP4008992A1 publication Critical patent/EP4008992A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
    • F42B12/58—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles
    • F42B12/62—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile
    • F42B12/64—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile the submissiles being of shot- or flechette-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02—Stabilising arrangements
    • F42B10/26—Stabilising arrangements using spin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
    • F42B12/58—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles
    • F42B12/62—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile

Definitions

  • the technical field of the invention is that of gyrostabilized projectiles comprising a body containing a payload formed of a set of sub-projectiles dispersible on trajectory by a pyrotechnic charge and in particular medium caliber projectiles (caliber between 20mm and 70mm ) used in anti-aircraft defense.
  • a gyrostabilized projectile comprising a body containing a cup filled with a set of sub-projectiles.
  • the bucket is expelled on a trajectory with the sub-projectiles by the action of a piston pushed by a pyrotechnic charge attached to a base in the rear part of the body.
  • the body carries in its front part a ballistic warhead which closes the bucket.
  • the warhead is linked to the body of the projectile at the level of its periphery by a fragile connection, calibrated at breakage, and capable of breaking when the piston pushes the cup against the warhead at the time of the expulsion of the sub-projectiles.
  • the invention therefore proposes to solve a problem of the solidity of the connection between a warhead and a projectile body ejecting a payload by pyrotechnic action.
  • the invention thus relates to a gyrostabilized projectile comprising a hollow body carrying a payload formed of a set of sub-projectiles, inert and dispersible on trajectory, which are contained in a cup which carries a piston which closes one of its ends.
  • the body comprising at its rear part a base housing a pyrotechnic charge separated from the sub-projectiles by the piston which can translate relative to the projectile body to push the cup and the sub-projectiles axially out of the body, the single cup being substantially cylindrical and of diameter corresponding to that of a cylindrical bore internal to the body, the bucket being formed by the assembly of at least two sectors, independent of each other and contiguous along their edges parallel to the longitudinal axis of the projectile , projectile characterized in that the piston is integral with the sectors when they are contained in the body and in that the bucket is made integral with the body by a weakened connecting means which is sized to break under the force of the piston pushed by the gases from the pyrotechnic charge, a warhead being secured to the cup by means of securing means coaxial with the longitudinal axis of the projectile and which is blocked by the sectors of the cup.
  • the weakened connecting means may comprise screws connecting the projectile body and the piston, screws comprising a section calibrated to rupture.
  • the screws may be oriented radially to the longitudinal axis of the projectile.
  • each screw can also pass through a sector to link it to the piston.
  • the screws may be oriented parallel to the longitudinal axis of the projectile.
  • the weakened connecting means may comprise a sleeve screwed into a bore of the rear face of the piston, sleeve comprising a shoulder arranged in such a way that a part of the body is pinched between the shoulder and the face back of the piston, thus securing the cup to the body, the sleeve comprising a zone weakened and calibrated to fracture in tension.
  • the means for securing the ogive to the bucket may comprise a polygonal head screw, the front ends of the sectors of the bucket being joined around the polygonal head so as to form an embedding with the latter. when the cup is in the body of the projectile, the separation of the sectors releasing the head.
  • the warhead can be screwed onto the screw and have its periphery resting on the body of the projectile.
  • the projectile may comprise at least one key engaged in a housing of corresponding shape located between each sector of the bucket and the body of the projectile to link said sector of the bucket and the body in rotation around the longitudinal axis of the projectile without impeding the ejection of the bucket from the body.
  • a medium caliber projectile 1 (caliber between 20 mm and 70 mm) comprises a hollow body 2 comprising at its rear part a base 3.
  • the front part of the body 2 is closed by a ballistic warhead 4.
  • the hollow body 2 comprises a cavity 2a substantially cylindrical opening onto the front of the body 2, cavity which contains a cup 5 of corresponding shape.
  • Bucket 5 is filled with inert sub-projectiles 11 forming a payload that can be dispersed on trajectory as we will see below.
  • the bucket 5 comprises sectors 5a independent of each other and contiguous along their edges parallel to the longitudinal axis X of the projectile 1. There are three sectors here.
  • the rear end of bucket 5 carries a piston 5b which closes off its rear part.
  • the sectors 5a are joined around a polygonal head 6a of a screw 6, coaxial with the projectile 1, so as to form a recess of the screw 6 relative to the cup 5.
  • the screw 6 forms a means 6 for securing the bucket 5 with the warhead 4.
  • the threaded part of the screw 6 makes it possible to screw the warhead 4 until its rim 4a bears against the front edge of the body 2 .
  • each sector 5a of bucket 5 and body 2 of projectile 1 at least one key 7 is engaged in a housing 14 of corresponding shape (housing shared between the body 2 and the sector 5a considered).
  • the keys 7 make it possible to link the cup 5 and the body 2 in rotation around the longitudinal axis X of the projectile 1.
  • each key 7 is oriented parallel to the longitudinal axis X of the projectile 1 so as not to hinder the ejection by sliding of the bucket 5 out of the body 2.
  • the bucket 5 is secured to the body 2 by means of screws 8 arranged radially to the longitudinal axis X of the projectile.
  • the screws 8 form a securing means and penetrate into the body 2 as well as into the piston 5b while crossing the sectors 5a, thus linking each sector 5a to the piston 5b.
  • the warhead 4 is fixed in a robust manner to the body 2 by means of the bucket 5 which transfers any shock stresses undergone by the warhead 4 towards the inside of the projectile, in areas where the connection with the body is less vulnerable.
  • the screws 8 constitute weakened connection means because they comprise a shear weakening zone 8a located at the junction between the bucket 5 and the body 2 giving a shearable character to the connection means 8 which is not disturbed by shocks radial on the ogive 4 for example.
  • the embrittlement zone comprises for example a calibrated section 8a in order to break consecutively upon reaching a stress threshold obtained by the thrust of the piston 5b undergoing the pressure of the gases resulting from the initiation of a pyrotechnic charge 10, charge located behind the piston 5b, in a chamber 3a at the base 3 of the projectile 1.
  • the piston 5b comprises a shoulder 5c on which the rear ends of the sectors 5a rest, this which allows it, once the screws 8 have been broken, to push the sectors 5a, the sub-projectiles 11 and the warhead 4 forward of the body 2 in the direction of the trajectory of the projectile 1 as shown in figure 5 .
  • the sub-projectiles 11 are also released and are distributed in the surrounding space under the effect of centrifugal forces in order to bring their kinetic effects to a target not shown, kinetic effects due to the speed of the projectile 1 added to the projection speed provided by the thrust of the piston 5b.
  • the sub-projectiles 11 are represented before their dispersion.
  • the weakened connection means 8 are still screws 8 but they are oriented parallel to the longitudinal axis X of the projectile 1 and secure a rear part of the body 2 to a rear face of the piston 5b.
  • the weakened connection means will therefore be sized to break consecutively to a tensile stress generated by the pressure of the gases from the load 10.
  • the sectors 5a of the bucket 5 are fixed to the piston by pins 12.
  • the pins 12 are cylindrical and do not have no protuberance at their end, which allows easy detachment of the sectors 5a relative to the piston 5 once the cup 5 has been ejected from the body 2 as at the figure 5 .
  • the sliding fit of the bucket 5 relative to the body 2 prevents any detachment of the sectors relative to the piston 5b. A monolithic assembly is thus obtained connecting the warhead 4 to the body of the projectile in a robust manner.
  • the weakened connection means 8 comprises a sleeve 8 screwed into a bore in the rear face of the piston 5b and which comprises a shoulder arranged in such a way that a part of the body 2 is clamped between the shoulder 8b and the rear face of the piston 5b, thus securing cup 5 with body 2.
  • the sleeve 8 has a zone weakened and calibrated to rupture in tension so that the bucket 5 can be ejected once the threshold pressure has been reached in the chamber 3a.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Gyroscopes (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Description

Le domaine technique de l'invention est celui des projectiles gyrostabilisés comportant un corps renfermant une charge utile formée d'un ensemble de sous-projectiles dispersables sur trajectoire par une charge pyrotechnique et en particulier des projectiles de moyen calibre (calibre compris entre 20mm et 70mm) utilisés dans le cadre de la défense anti aérienne.The technical field of the invention is that of gyrostabilized projectiles comprising a body containing a payload formed of a set of sub-projectiles dispersible on trajectory by a pyrotechnic charge and in particular medium caliber projectiles (caliber between 20mm and 70mm ) used in anti-aircraft defense.

On connaît par le brevet EP2578987 un projectile gyrostabilisé comportant un corps renfermant un godet rempli d'un ensemble de sous-projectiles. Le godet est expulsé sur trajectoire avec les sous projectiles par l'action d'un piston poussé par une charge pyrotechnique solidaire d'un culot en partie arrière du corps. Le corps porte à sa partie avant une ogive balistique qui obture le godet. L'ogive est liée au corps du projectile au niveau de sa périphérie par une liaison fragile, calibrée à la rupture, et apte à rompre lorsque le piston pousse le godet contre l'ogive au moment de l'expulsion des sous projectiles.We know from the patent EP2578987 a gyrostabilized projectile comprising a body containing a cup filled with a set of sub-projectiles. The bucket is expelled on a trajectory with the sub-projectiles by the action of a piston pushed by a pyrotechnic charge attached to a base in the rear part of the body. The body carries in its front part a ballistic warhead which closes the bucket. The warhead is linked to the body of the projectile at the level of its periphery by a fragile connection, calibrated at breakage, and capable of breaking when the piston pushes the cup against the warhead at the time of the expulsion of the sub-projectiles.

Une telle liaison entre le corps de projectile et l'ogive n'est pas satisfaisante car elle se situe à un endroit du projectile qui est fortement sollicité par des chocs radiaux lors de la mise à poste du projectile dans un canon, notamment au niveau d'un cône dit de forcement dans certains canons, cône qui est chargé de coincer le projectile avant d'être tiré.Such a connection between the projectile body and the warhead is not satisfactory because it is located at a point of the projectile which is strongly stressed by radial shocks when the projectile is placed in position in a barrel, in particular at the level of a so-called forcing cone in certain guns, a cone which is responsible for jamming the projectile before being fired.

Les sollicitations subies par la liaison fragile entre ogive et corps peuvent amener à la rupture du projectile, ce qui peut également endommager le canon lors du tir, ou bien simplement affaiblir la liaison fragile qui n'opposera pas le niveau de résistance suffisant lors du fonctionnement de la charge pyrotechnique afin d'atteindre le niveau de pression satisfaisant pour avoir une éjection optimale du godet et des sous projectiles.The stresses undergone by the fragile connection between warhead and body can lead to the rupture of the projectile, which can also damage the barrel during firing, or simply weaken the fragile connection which will not oppose the sufficient level of resistance during operation. of the pyrotechnic charge in order to reach the pressure level satisfactory to have an optimal ejection of the bucket and the sub-projectiles.

L'invention propose donc de résoudre un problème de solidité de la liaison entre une ogive et un corps de projectile éjectant une charge utile par action pyrotechnique.The invention therefore proposes to solve a problem of the solidity of the connection between a warhead and a projectile body ejecting a payload by pyrotechnic action.

L'invention a ainsi pour objet un projectile gyrostabilisé comportant un corps creux emportant une charge utile formée d'un ensemble de sous-projectiles, inertes et dispersables sur trajectoire, qui sont contenus dans un godet qui porte un piston qui obture une de ses extrémités, le corps comportant à sa partie arrière un culot abritant une charge pyrotechnique séparée des sous-projectiles par le piston qui peut se translater par rapport au corps de projectile pour pousser axialement le godet et les sous-projectiles hors du corps, le godet unique étant sensiblement cylindrique et de diamètre correspondant avec celui d'un alésage cylindrique interne au corps, le godet étant formé de l'assemblage d'au moins deux secteurs, indépendants les uns des autres et jointifs selon leurs bords parallèles à l'axe longitudinal du projectile, projectile caractérisé en ce que le piston est solidaire des secteurs lorsqu'ils sont contenus dans le corps et en ce que le godet est rendu solidaire du corps par un moyen de liaison fragilisé qui est dimensionné pour rompre sous l'effort du piston poussé par les gaz issus de la charge pyrotechnique, une ogive étant solidaire du godet grâce à un moyen de solidarisation coaxial à l'axe longitudinal du projectile et qui est bloqué par les secteurs du godet.The invention thus relates to a gyrostabilized projectile comprising a hollow body carrying a payload formed of a set of sub-projectiles, inert and dispersible on trajectory, which are contained in a cup which carries a piston which closes one of its ends. , the body comprising at its rear part a base housing a pyrotechnic charge separated from the sub-projectiles by the piston which can translate relative to the projectile body to push the cup and the sub-projectiles axially out of the body, the single cup being substantially cylindrical and of diameter corresponding to that of a cylindrical bore internal to the body, the bucket being formed by the assembly of at least two sectors, independent of each other and contiguous along their edges parallel to the longitudinal axis of the projectile , projectile characterized in that the piston is integral with the sectors when they are contained in the body and in that the bucket is made integral with the body by a weakened connecting means which is sized to break under the force of the piston pushed by the gases from the pyrotechnic charge, a warhead being secured to the cup by means of securing means coaxial with the longitudinal axis of the projectile and which is blocked by the sectors of the cup.

Avantageusement, le moyen de liaison fragilisé pourra comporter des vis liant le corps de projectile et le piston, vis comportant une section calibrée à la rupture.Advantageously, the weakened connecting means may comprise screws connecting the projectile body and the piston, screws comprising a section calibrated to rupture.

Selon un autre mode de réalisation, les vis pourront être orientées radialement à l'axe longitudinal du projectile.According to another embodiment, the screws may be oriented radially to the longitudinal axis of the projectile.

Avantageusement, chaque vis pourra traverser également un secteur pour le lier au piston.Advantageously, each screw can also pass through a sector to link it to the piston.

Selon un autre mode de réalisation, les vis pourront être orientées parallèlement à l'axe longitudinal du projectile.According to another embodiment, the screws may be oriented parallel to the longitudinal axis of the projectile.

Selon un autre mode de réalisation, le moyen de liaison fragilisé pourra comporter une douille vissée dans un alésage de la face arrière du piston, douille comportant un épaulement agencé de manière telle qu'une partie du corps est pincée entre l'épaulement et la face arrière du piston, solidarisant ainsi le godet avec le corps, la douille comportant une zone fragilisée et calibrée à la rupture en traction.According to another embodiment, the weakened connecting means may comprise a sleeve screwed into a bore of the rear face of the piston, sleeve comprising a shoulder arranged in such a way that a part of the body is pinched between the shoulder and the face back of the piston, thus securing the cup to the body, the sleeve comprising a zone weakened and calibrated to fracture in tension.

Selon un mode particuleir de réalisation, le moyen de solidarisation de l'ogive avec le godet pourra comporter une vis à tête polygonale, les extrémités avant des secteurs du godet étant réunies autour de la tête polygonale de manière à former un encastrement avec celle-ci lorsque le godet est dans le corps du projectile, la séparation des secteurs libérant la tête.According to a particular embodiment, the means for securing the ogive to the bucket may comprise a polygonal head screw, the front ends of the sectors of the bucket being joined around the polygonal head so as to form an embedding with the latter. when the cup is in the body of the projectile, the separation of the sectors releasing the head.

Avantageusement, l'ogive pourra être vissée sur la vis et avoir son pourtour qui est en appui sur le corps du projectile.Advantageously, the warhead can be screwed onto the screw and have its periphery resting on the body of the projectile.

Selon une autre caractéristique de l'invention, le projectile pourra comporter au moins une clavette engagée dans un logement de forme correspondante situé entre chaque secteur du godet et le corps du projectile pour lier ledit secteur du godet et le corps en rotation autour de l'axe longitudinal du projectile sans entraver l'éjection du godet hors du corps.According to another characteristic of the invention, the projectile may comprise at least one key engaged in a housing of corresponding shape located between each sector of the bucket and the body of the projectile to link said sector of the bucket and the body in rotation around the longitudinal axis of the projectile without impeding the ejection of the bucket from the body.

L'invention sera mieux comprise à la lecture de la description suivante, description faite à la lumière des dessins en annexe dans lesquels :

  • [Fig. 1] représente une vue en coupe transversale d'un projectile selon un premier mode de réalisation de l'invention.
  • [Fig. 2] représente une vue de détail en coupe transversale d'un projectile selon le premier mode de réalisation de l'invention.
  • [Fig. 3] représente une vue en coupe transversale d'un projectile selon un deuxième mode de réalisation de l'invention.
  • [Fig. 4] représente une vue en coupe transversale d'un projectile selon un troisième mode de réalisation de l'invention.
  • [Fig. 5] représente une vue de trois quarts d'un projectile selon l'invention, en fonctionnement sur trajectoire.
The invention will be better understood on reading the following description, description given in the light of the appended drawings in which:
  • [ Fig. 1 ] shows a cross-sectional view of a projectile according to a first embodiment of the invention.
  • [ Fig. 2 ] shows a cross-sectional detail view of a projectile according to the first embodiment of the invention.
  • [ Fig. 3 ] shows a cross-sectional view of a projectile according to a second embodiment of the invention.
  • [ Fig. 4 ] shows a cross-sectional view of a projectile according to a third embodiment of the invention.
  • [ Fig. 5 ] shows a three-quarter view of a projectile according to the invention, in operation on trajectory.

Selon la figure 1, un projectile 1 de moyen calibre (calibre entre 20mm et 70 mm) comporte un corps 2 creux comportant à sa partie arrière un culot 3. La partie avant du corps 2 est fermée par une ogive balistique 4. Le corps creux 2 comporte une cavité 2a sensiblement cylindrique débouchant sur l'avant du corps 2, cavité qui contient un godet 5 de forme correspondante.According to figure 1 , a medium caliber projectile 1 (caliber between 20 mm and 70 mm) comprises a hollow body 2 comprising at its rear part a base 3. The front part of the body 2 is closed by a ballistic warhead 4. The hollow body 2 comprises a cavity 2a substantially cylindrical opening onto the front of the body 2, cavity which contains a cup 5 of corresponding shape.

Le godet 5 est rempli de sous projectiles 11 inertes formant une charge utile dispersable sur trajectoire comme nous le verrons plus loin.Bucket 5 is filled with inert sub-projectiles 11 forming a payload that can be dispersed on trajectory as we will see below.

Le godet 5 comporte des secteurs 5a indépendants les uns des autres et jointifs selon leurs bords parallèles à l'axe longitudinal X du projectile 1. Il y a ici trois secteurs.The bucket 5 comprises sectors 5a independent of each other and contiguous along their edges parallel to the longitudinal axis X of the projectile 1. There are three sectors here.

L'extrémité arrière du godet 5 porte un piston 5b qui obture sa partie arrière. Sur la partie avant du godet 5 les secteurs 5a sont réunis autour d'une tête polygonale 6a d'une vis 6, coaxiale au projectile 1, de manière à former un encastrement de la vis 6 relativement au godet 5.The rear end of bucket 5 carries a piston 5b which closes off its rear part. On the front part of the cup 5 the sectors 5a are joined around a polygonal head 6a of a screw 6, coaxial with the projectile 1, so as to form a recess of the screw 6 relative to the cup 5.

La vis 6 forme un moyen de solidarisation 6 du godet 5 avec l'ogive 4. La partie filetée de la vis 6 permet de visser l'ogive 4 jusqu'à ce que son rebord 4a soit en appui avec le bord avant du corps 2.The screw 6 forms a means 6 for securing the bucket 5 with the warhead 4. The threaded part of the screw 6 makes it possible to screw the warhead 4 until its rim 4a bears against the front edge of the body 2 .

Entre chaque secteur 5a du godet 5 et le corps 2 du projectile 1, au moins une clavette 7 est engagée dans un logement 14 de forme correspondante (logement partagé entre le corps 2 et le secteur 5a considéré) . Les clavettes 7 permettent de lier le godet 5 et le corps 2 en rotation autour de l'axe longitudinal X du projectile 1. Il y a ici deux clavettes 7 par secteur 5a.Between each sector 5a of bucket 5 and body 2 of projectile 1, at least one key 7 is engaged in a housing 14 of corresponding shape (housing shared between the body 2 and the sector 5a considered). The keys 7 make it possible to link the cup 5 and the body 2 in rotation around the longitudinal axis X of the projectile 1. There are here two keys 7 per sector 5a.

Comme visible à la figure 5, le logement 14 de chaque clavette 7 est orienté parallèlement à l'axe longitudinal X du projectile 1 pour ne pas entraver l'éjection par coulissement du godet 5 hors du corps 2.As seen at figure 5 , the housing 14 of each key 7 is oriented parallel to the longitudinal axis X of the projectile 1 so as not to hinder the ejection by sliding of the bucket 5 out of the body 2.

Selon le mode de réalisation de la figure 1, le godet 5 est rendu solidaire du corps 2 grâce à des vis 8 disposées radialement à l'axe longitudinal X du projectile. Les vis 8 forment un moyen de solidarisation et pénètrent dans le corps 2 ainsi que dans le piston 5b tout en traversant les secteurs 5a, liant ainsi chaque secteur 5a au piston 5b.According to the embodiment of the figure 1 , the bucket 5 is secured to the body 2 by means of screws 8 arranged radially to the longitudinal axis X of the projectile. The screws 8 form a securing means and penetrate into the body 2 as well as into the piston 5b while crossing the sectors 5a, thus linking each sector 5a to the piston 5b.

De cette manière l'ogive 4 est fixée de manière robuste au corps 2 par l'intermédiaire du godet 5 qui reporte les éventuelles contraintes de chocs subies par l'ogive 4 vers l'intérieur du projectile, en des zones ou la liaison avec le corps est moins vulnérable.In this way the warhead 4 is fixed in a robust manner to the body 2 by means of the bucket 5 which transfers any shock stresses undergone by the warhead 4 towards the inside of the projectile, in areas where the connection with the body is less vulnerable.

Comme détaillé à la figure 2, les vis 8 constituent des moyens de liaison fragilisés car ils comportent une zone de fragilisation en cisaillement 8a située à la jonction entre le godet 5 et le corps 2 donnant un caractère cisaillable au moyen de liaison 8 qui n'est pas perturbé par des chocs radiaux sur l'ogive 4 par exemple.As detailed at figure 2 , the screws 8 constitute weakened connection means because they comprise a shear weakening zone 8a located at the junction between the bucket 5 and the body 2 giving a shearable character to the connection means 8 which is not disturbed by shocks radial on the ogive 4 for example.

La zone de fragilisation comporte par exemple une section calibrée 8a afin de rompre consécutivement à l'atteinte d'un seuil de contraintes obtenu par la poussée du piston 5b subissant la pression des gaz issus de l'initiation d'une charge pyrotechnique 10, charge située en arrière du piston 5b, dans une chambre 3a au niveau du culot 3 du projectile 1.The embrittlement zone comprises for example a calibrated section 8a in order to break consecutively upon reaching a stress threshold obtained by the thrust of the piston 5b undergoing the pressure of the gases resulting from the initiation of a pyrotechnic charge 10, charge located behind the piston 5b, in a chamber 3a at the base 3 of the projectile 1.

On note que le piston 5b comporte un épaulement 5c sur lequel s'appuient les extrémités arrière des secteurs 5a, ce qui lui permet, une fois les vis 8 rompues, de pousser les secteurs 5a, les sous projectiles 11 et l'ogive 4 en avant du corps 2 dans le sens de la trajectoire du projectile 1 comme représenté à la figure 5.It is noted that the piston 5b comprises a shoulder 5c on which the rear ends of the sectors 5a rest, this which allows it, once the screws 8 have been broken, to push the sectors 5a, the sub-projectiles 11 and the warhead 4 forward of the body 2 in the direction of the trajectory of the projectile 1 as shown in figure 5 .

Dès que les secteurs 5a sont éjectés du corps 2, le projectile 1 étant gyrostabilisé, les secteurs 5a subissent des forces centrifuges tendant à les écarter radialement ce qui libère la tête de vis 6 et donc l'ogive 4.As soon as the sectors 5a are ejected from the body 2, the projectile 1 being gyrostabilized, the sectors 5a undergo centrifugal forces tending to spread them radially, which releases the screw head 6 and therefore the warhead 4.

Les sous projectiles 11 sont également libérés et se répartissent dans l'espace environnant sous l'effet de forces centrifuges afin de porter leurs effets cinétiques sur une cible non représentée, effets cinétiques dus à la vitesse du projectile 1 additionnée de la vitesse de projection fournie par la poussée du piston 5b. Pour des raisons de lisibilité de la figure 5, les sous projectiles 11 sont représentés avant leur dispersion.The sub-projectiles 11 are also released and are distributed in the surrounding space under the effect of centrifugal forces in order to bring their kinetic effects to a target not shown, kinetic effects due to the speed of the projectile 1 added to the projection speed provided by the thrust of the piston 5b. For reasons of readability of the figure 5 , the sub-projectiles 11 are represented before their dispersion.

Selon un second mode de réalisation représenté à la figure 3, les moyens de liaison fragilisés 8 sont encore des vis 8 mais elles sont orientées parallèlement à l'axe longitudinal X du projectile 1 et solidarisent une partie arrière du corps 2 à une face arrière du piston 5b.According to a second embodiment shown in picture 3 , the weakened connection means 8 are still screws 8 but they are oriented parallel to the longitudinal axis X of the projectile 1 and secure a rear part of the body 2 to a rear face of the piston 5b.

Les moyens de liaison fragilisés seront donc dimensionnés pour rompre consécutivement à une contrainte de traction générée par la pression des gaz issus de la charge 10. Les secteurs 5a du godet 5 sont fixés au piston par des goupilles 12. Les goupilles 12 sont cylindriques et ne présentent pas de protubérance à leur extrémité ce qui permet un détachement aisé des secteurs 5a relativement au piston 5 une fois le godet 5 éjecté du corps 2 comme à la figure 5. En revanche lorsque le godet 5 est dans le corps 2, l'ajustement glissant du godet 5 relativement au corps 2 empêche tout détachement des secteurs relativement au piston 5b. On obtient ainsi un ensemble monolithique reliant l'ogive 4 au corps du projectile de manière robuste.The weakened connection means will therefore be sized to break consecutively to a tensile stress generated by the pressure of the gases from the load 10. The sectors 5a of the bucket 5 are fixed to the piston by pins 12. The pins 12 are cylindrical and do not have no protuberance at their end, which allows easy detachment of the sectors 5a relative to the piston 5 once the cup 5 has been ejected from the body 2 as at the figure 5 . On the other hand, when the bucket 5 is in the body 2, the sliding fit of the bucket 5 relative to the body 2 prevents any detachment of the sectors relative to the piston 5b. A monolithic assembly is thus obtained connecting the warhead 4 to the body of the projectile in a robust manner.

Selon la figure 4, le moyen de liaison fragilisé 8 comporte une douille 8 vissée dans un alésage de la face arrière du piston 5b et qui comporte un épaulement agencé de manière telle qu'une partie du corps 2 est serrée entre l'épaulement 8b et la face arrière du piston 5b, solidarisant ainsi le godet 5 avec le corps 2.According to figure 4 , the weakened connection means 8 comprises a sleeve 8 screwed into a bore in the rear face of the piston 5b and which comprises a shoulder arranged in such a way that a part of the body 2 is clamped between the shoulder 8b and the rear face of the piston 5b, thus securing cup 5 with body 2.

La douille 8 présente une zone fragilisée et calibrée à la rupture en traction afin que le godet 5 puisse être éjecté une fois la pression de seuil atteinte dans la chambre 3a.The sleeve 8 has a zone weakened and calibrated to rupture in tension so that the bucket 5 can be ejected once the threshold pressure has been reached in the chamber 3a.

Claims (9)

  1. - A gyrostabilised projectile (1) including a hollow body (2) carrying a payload formed of a set of inert sub-projectiles (11) that can be dispersed on trajectory and are contained in a cup (5) that includes a piston (5b) closing one of its ends, the body (2) being provided at its rear part with a base (3) housing a pyrotechnic charge (10) separated from the sub-projectiles (11) by the piston (5b), which can translate with respect to the body (2) of the projectile (1) so as to push the cup (5) and the sub-projectiles (11) axially out of the body (2), the single cup (5) being substantially cylindrical and of a diameter corresponding to that of a cylindrical bore inside the body (2), the cup (5) being formed by the assembly of at least two sectors (5a), independent of each other and joined along their edges parallel to the longitudinal axis of the projectile (1), the projectile being characterised in that the piston (5b) is secured to the sectors (5a) when they are contained in the body (2) and in that the cup (5) is secured to the body (2) by a weakened connecting means (8) that is dimensioned so as to break under the force of the piston (5b) pushed by the gases generated by the pyrotechnic charge (10), a forebody (4) being secured to the cup (5) with a securing means (6) that is coaxial with the longitudinal axis (X) of the projectile (1) and locked by the sectors (5a) of the cup (5).
  2. - The projectile (1) according to claim 1, characterised in that the weakened connecting means includes screws (8) connecting the projectile body (2) and the piston (5b), the screws (8) having a section (8a) calibrated to break.
  3. - The projectile (1) according to claim 2, characterised in that the screws (8) are oriented radially to the longitudinal axis (X) of the projectile (1).
  4. - The projectile (1) according to claim 3, characterised in that each screw (8) also passes through a sector (5a) to connect it to the piston (5b).
  5. - The projectile (1) according to claim 2, characterised in that the screws (8) are oriented parallel to the longitudinal axis (X) of the projectile (1).
  6. - The projectile (1) according to claim 1, characterised in that the weakened connecting means includes a socket (8) screwed into a bore in the rear face of the piston (5b), the socket (8) including a shoulder arranged so that a part of the body (2) is clamped between the shoulder and the rear face of the piston (5b), thereby securing the cup (5) to the body (2), the socket (8) including a weakened zone calibrated for tensile failure.
  7. - The projectile (1) according to any one of claims 1 to 6, characterised in that the means (6) for securing the forebody (4) to the cup (5) includes a screw (6) with a polygonal head, the front ends of the sectors (5a) of the cup (5) being joined together around the polygonal head (6a) so as to form an embedded connection with the latter when the cup (5) is in the body of the projectile (1), the separation of the sectors (5a) releasing the head (6).
  8. - The projectile (1) according to claim 7, characterised in that the forebody (4) is screwed onto the screw (6) and has its rim bearing on the body (2) of the projectile (1).
  9. - The projectile (1) according to any one of the preceding claims, characterised in that it includes at least one key (7) engaged in a correspondingly shaped housing (14) located between each sector (5a) of the cup (5) and the body (2) of the projectile (1), so as to connect said sector (5a) of the cup (5) and the body (2) for rotation about the longitudinal axis (X) of the projectile (1) without hindering ejection of the cup (5) from the body (2).
EP21210418.6A 2020-12-02 2021-11-25 Spin-stabilised projectile Active EP4008992B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2012455A FR3116894B1 (en) 2020-12-02 2020-12-02 Gyro-stabilized projectile

Publications (2)

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EP4008992A1 EP4008992A1 (en) 2022-06-08
EP4008992B1 true EP4008992B1 (en) 2023-05-03

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US (1) US11650035B2 (en)
EP (1) EP4008992B1 (en)
ES (1) ES2951149T3 (en)
FI (1) FI4008992T3 (en)
FR (1) FR3116894B1 (en)
IL (1) IL288546A (en)
PL (1) PL4008992T3 (en)
PT (1) PT4008992T (en)

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US3956990A (en) * 1964-07-31 1976-05-18 The United States Of America As Represented By The Secretary Of The Army Beehive projectile
US3954060A (en) * 1967-08-24 1976-05-04 The United States Of America As Represented By The Secretary Of The Army Projectile
US4430941A (en) * 1968-05-27 1984-02-14 Fmc Corporation Projectile with supported missiles
US3981244A (en) * 1972-02-28 1976-09-21 The United States Of America As Represented By The Secretary Of The Army Pyramid projectile payload ejection device
DE2824203A1 (en) * 1978-06-02 1979-12-06 Diehl Gmbh & Co BULLET WITH A MOUNTAINABLE IGNITION
US4221167A (en) * 1978-10-16 1980-09-09 The United States Of America As Represented By The Secretary Of The Army Delay burster for a projectile
IT1173087B (en) * 1984-01-20 1987-06-18 Simmel Spa ANTI-DEFORMATION DEVICE FOR ARTILLERY PROJECTS
DE3629668C1 (en) * 1986-08-30 1988-03-10 Rheinmetall Gmbh Swirl stabilized bomblet bullet
US6874425B1 (en) * 2001-05-18 2005-04-05 Day & Zimmermann, Inc. Projectile carrying sub-munitions
FR2952424B1 (en) * 2009-11-09 2012-11-02 Nexter Munitions LARGE NON-LETHAL OBUS CALIBER STABILIZED IN ROTATION
FR2954485B1 (en) * 2009-12-21 2012-05-11 Nexter Munitions LAUNCHING DEVICE FOR PROJECTILE OF ARTILLERY UNDER CALIBER.
FR2980843B1 (en) 2011-10-03 2014-06-13 Nexter Munitions GYROSTABILIZED PROJECTILE
US8931416B2 (en) * 2013-03-07 2015-01-13 The United States Of America As Represented By The Secretary Of The Navy Inert and pressure-actuated submunitions dispensing projectile
US10466023B2 (en) * 2018-03-28 2019-11-05 Ascendance International, LLC Long range large caliber frangible round for defending against UAV'S
US11561075B2 (en) * 2018-12-13 2023-01-24 The United States Of America, As Represented By The Secretary Of The Navy Projectile with pyrotechnically timed release of a secondary payload
US10703451B1 (en) * 2018-12-22 2020-07-07 Richard D Adams Countermeasures apparatus and method
US11391544B2 (en) * 2019-03-12 2022-07-19 P2K Technologies, LLC Device for locating, sharing, and engaging targets with firearms
US20200300591A1 (en) * 2019-03-21 2020-09-24 Corvid Technologies LLC Warheads and weapons and methods including same

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PL4008992T3 (en) 2023-05-29
US11650035B2 (en) 2023-05-16
FR3116894B1 (en) 2022-10-28
FI4008992T3 (en) 2023-06-07
ES2951149T3 (en) 2023-10-18
US20220170724A1 (en) 2022-06-02
FR3116894A1 (en) 2022-06-03
PT4008992T (en) 2023-05-31
EP4008992A1 (en) 2022-06-08
IL288546A (en) 2022-07-01

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