EP0395456B1 - Connection device between two parts of a gyrostabilized projectile - Google Patents

Connection device between two parts of a gyrostabilized projectile Download PDF

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Publication number
EP0395456B1
EP0395456B1 EP90400693A EP90400693A EP0395456B1 EP 0395456 B1 EP0395456 B1 EP 0395456B1 EP 90400693 A EP90400693 A EP 90400693A EP 90400693 A EP90400693 A EP 90400693A EP 0395456 B1 EP0395456 B1 EP 0395456B1
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EP
European Patent Office
Prior art keywords
projectile
profile
section
axis
accordance
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Expired - Lifetime
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EP90400693A
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German (de)
French (fr)
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EP0395456A1 (en
Inventor
Eric Barthelemy
Régis Aumasson
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Giat Industries SA
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Giat Industries SA
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Priority to AT90400693T priority Critical patent/ATE89919T1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
    • F42B30/003—Closures or baseplates therefor
    • 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 present invention relates to a device ensuring the connection between a first and a second section of a gyrostabilized projectile and more particularly of an artillery projectile, sections intended to separate on trajectory and whose trajectories must not interfere with each other after separation.
  • projectiles comprise a body containing a payload (for example a pot of lighting composition), and a gas-generating charge, placed at the level of the warhead, the initiation of which is controlled by an ignition system.
  • a payload for example a pot of lighting composition
  • a gas-generating charge placed at the level of the warhead, the initiation of which is controlled by an ignition system.
  • the pressure of the gases will be exerted via the payload on a closing base and will cause the separation of this one from the body of the projectile, as well as the release of the payload.
  • Payload and base will then follow independent paths, but, so that the payload is not disturbed (for example that the opening of a possible parachute is not hampered), it is essential that there is no interference between these trajectories.
  • a conventional solution consists in using a base comprising deployable fins which cause brutal aerodynamic braking.
  • the center of gravity of the base is then offset away from its geometric axis, which causes the imbalance.
  • the subject of the invention is a device ensuring the connection between a first and a second section of a gyrostabilized artillery projectile, sections intended to separate on the trajectory, device comprising at least one locking means as well as a first profile. carried by the first section and coming into contact with a second profile, complementary to the previous one, and integral with the second section, device characterized in that the first and second profiles do not have geometric symmetry relative to the axis of the projectile and therefore that the respective centers of gravity of the first and second sections are not on the axis of the projectile, and in that after assembly of the two sections the center of gravity of the assembly thus formed is carried by the axis of the projectile.
  • the first profile is carried by an extension of the first section and has at least one cylindrical surface coming into contact with a cylindrical surface of a housing secured to the second section.
  • the cylindrical surface is offset relative to the projectile, the locking means possibly comprising at least one key parallel to the axis of the projectile.
  • the first profile comprises at least two tabs separated by notches.
  • the tongues and the notches can be produced on the cylindrical surface of the extension in a radial direction of the projectile, and in the case where the prolongation of the first section affects the shape of a cylindrical crown, the tongues and the notches can be produced on the crown in an axial direction of the projectile.
  • the whole of the first profile is symmetrical relative to a radial plane passing through the axis of the projectile, and on this first profile, each notch of given dimensions is associated with a tongue of the same dimensions arranged symmetrically relative to the axis of the projectile.
  • the second profile may be carried by a ring made integral with the second section by a second locking means.
  • the first section will advantageously consist of the base of the projectile and the second section by the body of the projectile.
  • the second profile may be carried partially by the body of the projectile and partially by one of the submunitions.
  • Figure 1 shows schematically and in axial section a cargo shell with rear unloading.
  • Figure 2 shows, in perspective, a base carrying a profile corresponding to a first embodiment of the device according to the invention.
  • Figure 3 is a section along the plane A-A of Figure 1 of a projectile carrying a base of the type of that of Figure 2.
  • Figure 4 is a section along the plane A-A of Figure 1 of a projectile whose base has a profile corresponding to a second embodiment of the device according to the invention.
  • Figure 5 shows, in perspective, a base carrying a profile corresponding to a third embodiment of the device according to the invention.
  • FIG. 5A is a section along an axial plane of the projectile carrying the base of FIG. 5.
  • Figure 6 is a perspective view of a base combining two different types of profiles.
  • a projectile 1 (which is a cargo shell) comprises a substantially cylindrical body 2, which contains a payload 5, not shown here, which may be constituted for example by bombs or an illuminating pot , and which is linked in rotation to the body 2 by a connecting means of known type not shown (for example by radial pins).
  • the body 2 is closed at its front end by a warhead 3, which carries a rocket 8 intended to cause the ignition of a gas-generating pyrotechnic composition 6.
  • the base 4 has an extension 10, here having the shape of a cylindrical crown coming to be housed in a bore made on the body.
  • the extension has a first profile 11 comprising a certain number of surfaces which will be described in more detail below, this first profile comes into contact with a second profile 12, which is complementary to it and which is carried by the body 2, the surfaces composing this second profile constitute the bore made on the body.
  • a locking means which here consists of three radial pins 9, immobilizes the two sections and completes the connection device, but any other locking means could be envisaged (for example bonding).
  • the pressure of the gases generated by the composition 6 will be exerted on a piston 7 which will push the payload 5 towards the rear of the projectile causing the shearing of the various connecting pins, and the separation of the base 4 from the body 2.
  • Figures 2 and 3 show in detail the base 4 carrying a profile corresponding to a first embodiment of the connecting device according to the invention.
  • the extension 10 whose geometric axis identified at 15 coincides with the axis of symmetry (and main axis of inertia) of the projectile, carries on its external cylindrical surface 25 the profile 11 constituted by a number of notches 14 , made in a radial direction, and separated by tabs 13.
  • FIG. 3 which is a section of Figure 1 along the radial plane AA, we see that the profile 11 includes an alternation of circular sectors of different radii and different lengths whose dimensions and distribution are such that the together does not have geometric symmetry with respect to axis 15.
  • the profile 12 of the body being complementary to that of the base, the assembly constituted by the assembly of the base and the body constitutes in section a circular crown of constant thickness 17 and therefore presents a symmetry of revolution around the axis 15 ( see Figure 3).
  • the center of gravity of the body / base assembly is also carried by the axis 15 and the projectile does not have an imbalance.
  • the base is integral in rotation with the body of the projectile, the locking means (pins 9 or bonding) may therefore be less resistant, its only function being the connection in translation of these two sections.
  • Figure 4 shows a second embodiment of the connecting device according to the invention.
  • the extension 10 here has an internal cylindrical surface 24 having as its axis the axis of symmetry 15 of the projectile, and an external cylindrical surface 25 whose axis 19 is offset relative to the axis 15.
  • the internal cylindrical surface 24 effectively having the axis 15 as its axis, and the body of the projectile having a profile 12 complementary to the profile 11, the assembly constituted by the assembly of the base and the body constitutes in section a circular crown d constant thickness 17 and therefore has a symmetry of revolution around the axis 15.
  • a key 18 is disposed in a housing 20 arranged on the base, this key will not cause any imbalance for the projectile if it is made of the same material as the base and the body.
  • Figure 6 shows a base 4 carrying an extension 10 whose geometric axis identified at 15 is coincident with the axis of symmetry (and main axis of inertia) of the projectile.
  • This ring carries both notches 14 produced in a radial direction, separated by tongues 13, and notches 22 and tongues 21 produced in an axial direction.
  • the first make it possible to secure the rotation of the base and the body 2 of the projectile.
  • the second ensure the rotational drive of the payload 5 contained in the body, the latter then having a profile complementary to the profile consisting of tongues and axial notches.
  • the second profile is therefore carried in part by the body of the projectile and in part by the payload.
  • each notch 22 or 14 of given dimensions is associated with a tongue 21 or 13 of the same dimensions, arranged symmetrically relative to the axis 15.

Abstract

The technical sector of the invention is that of devices making the connection between a first and a second section of a gyrostabilised projectile, these sections being intended to separate on the trajectory. The device according to the invention comprises at least one locking means and a first profile (11) carried by the first section and coming into contact with a second profile (12) complementary with the preceding one and integral with the second section, and it is characterised in that the first and second profiles do not have geometrical symmetry in relation to the axis (15) of the projectile (1), and in that, after the two sections have been joined together, the centre of gravity of the assembly thus formed is in the axis of the projectile. The invention is used for releasable artillery projectiles. <IMAGE>

Description

La présente invention concerne un dispositif assurant la liaison entre un premier et un deuxième tronçons d'un projectile gyrostabilisé et plus particulièrement d'un projectile d'artillerie, tronçons destinés à se séparer sur trajectoire et dont les trajectoires ne doivent pas interférer entre elles après séparation.The present invention relates to a device ensuring the connection between a first and a second section of a gyrostabilized projectile and more particularly of an artillery projectile, sections intended to separate on trajectory and whose trajectories must not interfere with each other after separation.

On connaît déjà un certain nombre de projectiles constitués par plusieurs tronçons séparables.A number of projectiles are already known which consist of several separable sections.

Le type le plus connu est celui des projectiles dits à dépotage arrière (voir les brevets FR2260772 et EP0268049).The best known type is that of so-called rear unloading projectiles (see patents FR2260772 and EP0268049).

Ces projectiles comprennent un corps contenant une charge utile (par exemple un pot de composition éclairante), et une charge génératrice de gaz, disposée au niveau de l'ogive, dont l'initiation est commandée par un système d'allumage.These projectiles comprise a body containing a payload (for example a pot of lighting composition), and a gas-generating charge, placed at the level of the warhead, the initiation of which is controlled by an ignition system.

La pression des gaz va s'exercer par l'intermédiaire de la charge utile sur un culot de fermeture et va provoquer la séparation de celui-ci du corps du projectile, ainsi que la libération de la charge utile.The pressure of the gases will be exerted via the payload on a closing base and will cause the separation of this one from the body of the projectile, as well as the release of the payload.

Charge utile et culot vont alors suivre des trajectoires indépendantes, mais, afin que la charge utile ne soit pas perturbée (par exemple que l'ouverture d'un éventuel parachute ne soit pas gênée), il est indispensable qu'il n'y ait aucune interférence entre ces trajectoires.Payload and base will then follow independent paths, but, so that the payload is not disturbed (for example that the opening of a possible parachute is not hampered), it is essential that there is no interference between these trajectories.

Une solution classique consiste à utiliser un culot comportant des ailettes déployables qui provoquent un brutal freinage aérodynamique.A conventional solution consists in using a base comprising deployable fins which cause brutal aerodynamic braking.

Une autre solution décrite dans le brevet EP113646 est de prévoir sur le culot un tiroir qui s'écarte de celui-ci après dépotage sous l'effet de la force centrifuge.Another solution described in patent EP113646 is to provide a drawer on the base which moves away from it after stripping under the effect of centrifugal force.

Le centre de gravité du culot se trouve alors déporté en dehors de son axe géométrique ce qui provoque le déséquilibre.The center of gravity of the base is then offset away from its geometric axis, which causes the imbalance.

De telles solutions imposent l'assemblage mécanique d'un certain nombre de pièces qui doivent pouvoir se déplacer les unes relativement aux autres pour que le fonctionnement de l'ensemble soit correct. Ainsi un blocage du tiroir rendra le dispositif totalement inefficace.Such solutions require the mechanical assembly of a certain number of parts which must be able to move relative to each other for the operation of the assembly to be correct. Thus blocking the drawer will make the device totally ineffective.

L'utilisation de dispositifs à ressort est exclue en raison de la dégradation possible de leurs caractéristiques mécaniques au cours du stockage.The use of spring devices is excluded due to the possible deterioration of their mechanical characteristics during storage.

Il est enfin également exclu de prévoir un culot dont le centre de gravité se trouverait excentré dès le montage, le balourd d'un tel culot compromettrait gravement la stabilité de la trajectoire du projectile.Finally, it is also excluded to provide a base, the center of gravity of which is offset from the mounting, the imbalance of such a base would seriously compromise the stability of the trajectory of the projectile.

Les problèmes liés aux interférences éventuelles lors de la séparation du culot et du corps d'un projectile se retrouveront lors de la définition d'un projectile devant se découper en plusieurs tronçons cylindriques qui doivent suivre chacun des trajectoires distinctes après séparation.The problems linked to possible interference during the separation of the base and the body of a projectile will be found when defining a projectile which must be cut into several cylindrical sections which must each follow separate paths after separation.

Un tel type de projectile est décrit dans la demande de brevet FR8800077, ainsi que dans les brevets FR2595810 et FR2558585.Such a type of projectile is described in patent application FR8800077, as well as in patents FR2595810 and FR2558585.

C'est le but de l'invention que de proposer un dispositif qui assure la liaison entre deux tronçons d'un projectile d'artillerie, et qui permette d'éviter les interférences entre les tronçons après séparation, tout en n'imposant pas la mise en place de dispositifs de déstabilisation sur ces-derniers.It is the object of the invention to propose a device which ensures the connection between two sections of an artillery projectile, and which makes it possible to avoid interference between the sections after separation, while not imposing the installation of destabilization devices on the latter.

Ainsi l'invention a pour objet un dispositif assurant la liaison entre un premier et un deuxième tronçons d'un projectile d'artillerie gyrostabilisé, tronçons destinés à se séparer sur trajectoire, dispositif comprenant au moins un moyen de verrouillage ainsi qu'un premier profil porté par le premier tronçon et venant en contact avec un deuxième profil, complémentaire du précédent, et solidaire du deuxième tronçon, dispositif caractérisé en ce que les premier et deuxième profils ne présentent pas de symétrie géométrique relativement à l'axe du projectile et donc que les centres de gravité respectifs des premier et deuxième tronçons ne sont pas sur l'axe du projectile, et en ce que après assemblage des deux tronçons le centre de gravité de l'ensemble ainsi constitué est porté par l'axe du projectile.Thus, the subject of the invention is a device ensuring the connection between a first and a second section of a gyrostabilized artillery projectile, sections intended to separate on the trajectory, device comprising at least one locking means as well as a first profile. carried by the first section and coming into contact with a second profile, complementary to the previous one, and integral with the second section, device characterized in that the first and second profiles do not have geometric symmetry relative to the axis of the projectile and therefore that the respective centers of gravity of the first and second sections are not on the axis of the projectile, and in that after assembly of the two sections the center of gravity of the assembly thus formed is carried by the axis of the projectile.

Le premier profil est porté par un prolongement du premier tronçon et présente au moins une surface cylindrique venant en contact avec une surface cylindrique d'un logement solidaire du deuxième tronçon.The first profile is carried by an extension of the first section and has at least one cylindrical surface coming into contact with a cylindrical surface of a housing secured to the second section.

Selon un premier mode de réalisation la surface cylindrique est désaxée relativement au projectile, le moyen de verrouillage pouvant comporter au moins une clavette parallèle à l'axe du projectile.According to a first embodiment, the cylindrical surface is offset relative to the projectile, the locking means possibly comprising at least one key parallel to the axis of the projectile.

Selon un deuxième mode de réalisation le premier profil comprend au moins deux languettes séparées par des encoches.According to a second embodiment, the first profile comprises at least two tabs separated by notches.

Les languettes et les encoches peuvent être réalisées sur la surface cylindrique du prolongement suivant une direction radiale du projectile, et dans le cas où le prolongement du premier tronçon affecte la forme d'une couronne cylindrique, les languettes et les encoches peuvent être réalisées sur la couronne suivant une direction axiale du projectile.The tongues and the notches can be produced on the cylindrical surface of the extension in a radial direction of the projectile, and in the case where the prolongation of the first section affects the shape of a cylindrical crown, the tongues and the notches can be produced on the crown in an axial direction of the projectile.

De façon préférentielle, l'ensemble du premier profil est symétrique relativement à un plan radial passant par l'axe du projectile, et sur ce premier profil, chaque encoche de dimensions données est associée à une languette de mêmes dimensions disposée de façon symétrique relativement à l'axe du projectile.Preferably, the whole of the first profile is symmetrical relative to a radial plane passing through the axis of the projectile, and on this first profile, each notch of given dimensions is associated with a tongue of the same dimensions arranged symmetrically relative to the axis of the projectile.

Le deuxième profil pourra être porté par une bague rendue solidaire du deuxième tronçon par un deuxième moyen de verrouillage.The second profile may be carried by a ring made integral with the second section by a second locking means.

Dans le cas où le projectile est du type à dépotage arrière c'est à dire destiné à éjecter une charge utile sur trajectoire après séparation du culot et du corps du projectile, le premier tronçon sera avantageusement constitué par le culot du projectile et le deuxième tronçon par le corps du projectile.In the case where the projectile is of the rear unloading type, that is to say intended to eject a payload on the trajectory after separation of the base and the body of the projectile, the first section will advantageously consist of the base of the projectile and the second section by the body of the projectile.

Dans le cas où le projectile contient des sous-munitions cylindriques disposées à l'intérieur du corps, le deuxième profil pourra être porté partiellement par le corps du projectile et partiellement par une des sous-munitions.In the case where the projectile contains cylindrical submunitions placed inside the body, the second profile may be carried partially by the body of the projectile and partially by one of the submunitions.

L'invention sera mieux comprise à la lecture de la description qui va suivre de modes particuliers de réalisation, description faite en regard des dessins annexés dans lesquels:The invention will be better understood on reading the description which follows of particular embodiments, description made with reference to the appended drawings in which:

La Figure 1 représente schématiquement et en coupe axiale un obus cargo à dépotage arrière.Figure 1 shows schematically and in axial section a cargo shell with rear unloading.

La Figure 2 représente, en perspective, un culot portant un profil correspondant à un premier mode de réalisation du dispositif selon l'invention.Figure 2 shows, in perspective, a base carrying a profile corresponding to a first embodiment of the device according to the invention.

La Figure 3 est une coupe suivant le plan A-A de la Figure 1 d'un projectile portant un culot du type de celui de la Figure 2.Figure 3 is a section along the plane A-A of Figure 1 of a projectile carrying a base of the type of that of Figure 2.

La Figure 4 est une coupe suivant le plan A-A de la Figure 1 d'un projectile dont le culot présente un profil correspondant à un deuxième mode de réalisation du dispositif selon l'invention.Figure 4 is a section along the plane A-A of Figure 1 of a projectile whose base has a profile corresponding to a second embodiment of the device according to the invention.

La Figure 5 représente, en perspective, un culot portant un profil correspondant à un troisième mode de réalisation du dispositif selon l'invention.Figure 5 shows, in perspective, a base carrying a profile corresponding to a third embodiment of the device according to the invention.

La Figure 5A est une coupe suivant un plan axial du projectile portant le culot de la Figure 5.FIG. 5A is a section along an axial plane of the projectile carrying the base of FIG. 5.

La Figure 6 est une vue en perspective d'un culot combinant deux types différents de profils.Figure 6 is a perspective view of a base combining two different types of profiles.

En se reportant à la Figure 1, un projectile 1 (qui est un obus cargo) comprend un corps 2 sensiblement cylindrique, qui contient une charge utile 5, non représentée ici, qui pourra être constituée par exemple par des bombelettes ou bien un pot éclairant, et qui est liée en rotation au corps 2 par un moyen de liaison de type connu non représenté (par exemple par des goupilles radiales).Referring to Figure 1, a projectile 1 (which is a cargo shell) comprises a substantially cylindrical body 2, which contains a payload 5, not shown here, which may be constituted for example by bombs or an illuminating pot , and which is linked in rotation to the body 2 by a connecting means of known type not shown (for example by radial pins).

Le corps 2 est fermé à son extrémité avant par une ogive 3, qui porte une fusée 8 destinée à provoquer la mise à feu d'une composition pyrotechnique génératrice de gaz 6.The body 2 is closed at its front end by a warhead 3, which carries a rocket 8 intended to cause the ignition of a gas-generating pyrotechnic composition 6.

Il est fermé à son extrémité arrière par un culot 4. Le culot 4 présente un prolongement 10, ayant ici la forme d'une couronne cylindrique venant se loger dans un alésage réalisé sur le corps.It is closed at its rear end by a base 4. The base 4 has an extension 10, here having the shape of a cylindrical crown coming to be housed in a bore made on the body.

Le prolongement présente un premier profil 11 comprenant un certain nombre de surfaces qui seront décrites plus en détail ci-après, ce premier profil vient en contact avec un deuxième profil 12, qui lui est complémentaire et qui est porté par le corps 2, les surfaces composant ce deuxième profil constituent l'alésage réalisé sur le corps.The extension has a first profile 11 comprising a certain number of surfaces which will be described in more detail below, this first profile comes into contact with a second profile 12, which is complementary to it and which is carried by the body 2, the surfaces composing this second profile constitute the bore made on the body.

L'ajustement des deux profils empêche tout mouvement relatif dans une direction radiale qui serait préjudiciable à la stabilité de la trajectoire du projectile.The adjustment of the two profiles prevents any relative movement in a radial direction which would be detrimental to the stability of the trajectory of the projectile.

Un moyen de verrouillage, qui est ici constitué par trois goupilles radiales 9, immobilise les deux tronçons et complète le dispositif de liaison, mais tout autre moyen de verrouillage pourrait être envisagé (par exemple le collage).A locking means, which here consists of three radial pins 9, immobilizes the two sections and completes the connection device, but any other locking means could be envisaged (for example bonding).

La pression des gaz générés par la composition 6 va s'exercer sur un piston 7 qui poussera la charge utile 5 vers l'arrière du projectile provoquant le cisaillement des différentes goupilles de liaison, et la séparation du culot 4 du corps 2.The pressure of the gases generated by the composition 6 will be exerted on a piston 7 which will push the payload 5 towards the rear of the projectile causing the shearing of the various connecting pins, and the separation of the base 4 from the body 2.

Les Figures 2 et 3 représentent en détail le culot 4 portant un profil correspondant à un premier mode de réalisation du dispositif de liaison selon l'invention.Figures 2 and 3 show in detail the base 4 carrying a profile corresponding to a first embodiment of the connecting device according to the invention.

Le prolongement 10, dont l'axe géométrique repéré en 15 est confondu avec l'axe de symétrie (et axe principal d'inertie) du projectile, porte sur sa surface cylindrique extérieure 25 le profil 11 constitué par un certain nombre d'encoches 14, réalisées dans une direction radiale, et séparées par des languettes 13.The extension 10, whose geometric axis identified at 15 coincides with the axis of symmetry (and main axis of inertia) of the projectile, carries on its external cylindrical surface 25 the profile 11 constituted by a number of notches 14 , made in a radial direction, and separated by tabs 13.

En considérant la Figure 3, qui est une coupe de la Figure 1 suivant le plan radial A-A, on constate que le profil 11 comprend une alternance de secteurs circulaires de rayons différents et de longueurs différentes dont les dimensions et la répartition sont telles que l'ensemble ne présente pas de symétrie géométrique par rapport à l'axe 15.Considering Figure 3, which is a section of Figure 1 along the radial plane AA, we see that the profile 11 includes an alternation of circular sectors of different radii and different lengths whose dimensions and distribution are such that the together does not have geometric symmetry with respect to axis 15.

Globalement, pour le culot qui est réalisé dans un matériau homogène, cette répartition d'encoches et de languettes va entraîner un balourd.Overall, for the base which is made of a homogeneous material, this distribution of notches and tabs will cause an imbalance.

Le profil 12 du corps étant complémentaire de celui du culot, l'ensemble constitué par l'assemblage du culot et du corps constitue en coupe une couronne circulaire d'épaisseur 17 constante et présente donc une symétrie de révolution autour de l'axe 15 (voir Figure 3).The profile 12 of the body being complementary to that of the base, the assembly constituted by the assembly of the base and the body constitutes in section a circular crown of constant thickness 17 and therefore presents a symmetry of revolution around the axis 15 ( see Figure 3).

Les matériaux de ces deux tronçons étant identiques le centre de gravité de l'ensemble corps/culot est également porté par l'axe 15 et le projectile ne présente pas de balourd.The materials of these two sections being identical, the center of gravity of the body / base assembly is also carried by the axis 15 and the projectile does not have an imbalance.

Il sera avantageux de définir encoches et languettes d'une façon assurant le balourd maximal pour le culot seul.It will be advantageous to define notches and tabs in a manner ensuring maximum imbalance for the base only.

Ce balourd maximal sera obtenu en assurant d'une part une symétrie géométrique de l'ensemble du profil relativement à un plan radial 23 passant par l'axe 15, et d'autre part en associant à chaque encoche de dimensions données une languette de mêmes dimensions disposée de façon symétrique relativement à l'axe 15.This maximum unbalance will be obtained by ensuring on the one hand a geometric symmetry of the whole of the profile relative to a radial plane 23 passing through the axis 15, and on the other hand by associating with each notch of given dimensions a tongue of the same dimensions arranged symmetrically relative to axis 15.

En effet ainsi on est assuré que les balourds associés aux "défauts de masse" dûs aux encoches vont s'ajouter aux balourds associés aux "excès de masse" correspondant aux languettes, le résultat étant une position du centre de gravité 16 du culot seul sur le plan radial 23, et à la plus grande distance possible de l'axe 15.Indeed, it is ensured that the imbalances associated with the "mass defects" due to the notches will be added to the imbalances associated with the "excess mass" corresponding to the tongues, the result being a position of the center of gravity 16 of the base alone on the radial plane 23, and at the greatest possible distance from the axis 15.

On a pu ainsi obtenir une distance de l'ordre de 7 mm entre le centre de gravité 16 du culot et l'axe géométrique 15, sans que l'ensemble du projectile ne présente le moindre balourd.It was thus possible to obtain a distance of the order of 7 mm between the center of gravity 16 of the base and the geometric axis 15, without the entire projectile having the slightest imbalance.

On peut également noter qu'avec les profils 11 et 12 proposés par l'invention le culot est solidaire en rotation du corps du projectile, le moyen de verrouillage (goupilles 9 ou collage) pourra donc être moins résistant, sa seule fonction étant la liaison en translation de ces deux tronçons.It can also be noted that with the profiles 11 and 12 proposed by the invention the base is integral in rotation with the body of the projectile, the locking means (pins 9 or bonding) may therefore be less resistant, its only function being the connection in translation of these two sections.

La Figure 4 montre un deuxième mode de réalisation du dispositif de liaison selon l'invention.Figure 4 shows a second embodiment of the connecting device according to the invention.

Le prolongement 10 présente ici une surface cylindrique interne 24 ayant pour axe l'axe de symétrie 15 du projectile, et une surface cylindrique externe 25 dont l'axe 19 est décalé relativement à l'axe 15.The extension 10 here has an internal cylindrical surface 24 having as its axis the axis of symmetry 15 of the projectile, and an external cylindrical surface 25 whose axis 19 is offset relative to the axis 15.

Il en résulte un balourd pour le culot, le centre de gravité de ce dernier étant situé en 16.This results in an imbalance for the base, the center of gravity of the latter being located at 16.

Cependant, la surface cylindrique interne 24 ayant effectivement pour axe l'axe 15, et le corps du projectile présentant un profil 12 complémentaire du profil 11, l'ensemble constitué par l'assemblage du culot et du corps constitue en coupe une couronne circulaire d'épaisseur 17 constante et présente donc une symétrie de révolution autour de l'axe 15.However, the internal cylindrical surface 24 effectively having the axis 15 as its axis, and the body of the projectile having a profile 12 complementary to the profile 11, the assembly constituted by the assembly of the base and the body constitutes in section a circular crown d constant thickness 17 and therefore has a symmetry of revolution around the axis 15.

Les matériaux de ces deux tronçons étant identiques le centre de gravité de l'ensemble corps/culot est encore porté par l'axe 15 et le projectile ne présente pas de balourd.The materials of these two sections being identical, the center of gravity of the body / base assembly is still carried by the axis 15 and the projectile does not have an imbalance.

La liaison en rotation n'étant pas assurée par les profils, il est indispensable ici de prévoir un moyen de verrouillage permettant de remplir cette fonction. Ainsi une clavette 18 est disposée dans un logement 20 aménagé sur le culot, cette clavette n'entraînera aucun balourd pour le projectile si elle est réalisée dans le même matériau que le culot et le corps.The rotation connection is not provided by the profiles, it is essential here to provide a locking means for fulfilling this function. Thus a key 18 is disposed in a housing 20 arranged on the base, this key will not cause any imbalance for the projectile if it is made of the same material as the base and the body.

Il est possible également de réaliser sur le prolongement 10 des languettes et des encoches suivant une direction axiale. Les Figures 5 et 5A montrent une telle variante.It is also possible to produce on the extension 10 tongues and notches in an axial direction. Figures 5 and 5A show such a variant.

La définition de la répartition des languettes 21 et des encoches 22 se fait de la même façon que décrite précédemment.The definition of the distribution of the tongues 21 and of the notches 22 is done in the same way as described above.

Il est possible avec une telle solution d'obtenir des valeurs de balourd très importantes, le concepteur n'étant plus limité par l'épaisseur de la paroi du corps 2 pour définir les encoches.It is possible with such a solution to obtain very large unbalance values, the designer no longer being limited by the thickness of the wall of the body 2 to define the notches.

Il pourra être intéressant de disposer le profil porté par le corps 2 sur une bague intermédiaire (réalisée dans le même matériau que le culot), rendu solidaire du corps 2 par un deuxième moyen de verrouillage de type connu (goupilles, filetage...). On simplifie ainsi la fabrication et il devient possible d'adapter l'invention à des projectiles pour lesquels le matériau constituant le corps n'est pas le même que celui constituant le culot.It may be advantageous to have the profile carried by the body 2 on an intermediate ring (made of the same material as the base), made integral with the body 2 by a second locking means of known type (pins, thread ...). The manufacturing is thus simplified and it becomes possible to adapt the invention to projectiles for which the material constituting the body is not the same as that constituting the base.

Il sera enfin possible de combiner au niveau d'un projectile plusieurs types des profils décrits précédemment.It will finally be possible to combine at the level of a projectile several types of the profiles described above.

La Figure 6 montre un culot 4 portant un prolongement 10 dont l'axe géométrique repéré en 15 est confondu avec l'axe de symétrie (et axe principal d'inertie) du projectile.Figure 6 shows a base 4 carrying an extension 10 whose geometric axis identified at 15 is coincident with the axis of symmetry (and main axis of inertia) of the projectile.

Cette couronne porte à la fois des encoches 14 réalisées dans une direction radiale, séparées par des languettes 13, et des encoches 22 et languettes 21 réalisées suivant une direction axiale.This ring carries both notches 14 produced in a radial direction, separated by tongues 13, and notches 22 and tongues 21 produced in an axial direction.

Les premières permettent de réaliser la solidarisation en rotation du culot et du corps 2 du projectile. Les secondes assurent l'entraînement en rotation de la charge utile 5 contenue dans le corps, cette dernière présentant alors un profil complémentaire du profil constitué par languettes et encoches axiales.The first make it possible to secure the rotation of the base and the body 2 of the projectile. The second ensure the rotational drive of the payload 5 contained in the body, the latter then having a profile complementary to the profile consisting of tongues and axial notches.

Dans ce dernier cas le deuxième profil est donc porté en partie par le corps du projectile et en partie par la charge utile.In the latter case the second profile is therefore carried in part by the body of the projectile and in part by the payload.

Comme cela a déjà été vu précédemment, il sera alors judicieux de disposer languettes et encoches d'une façon telle que le culot présente une symétrie géométrique de l'ensemble des profils relativement à un plan radial 23 passant par l'axe 15, et que chaque encoche 22 ou 14 de dimensions données soit associée à une languette 21 ou 13 de mêmes dimensions, disposée de façon symétrique relativement à l'axe 15.As has already been seen previously, it will then be judicious to have tongues and notches in such a way that the base has a geometric symmetry of the set of profiles relative to a radial plane 23 passing through the axis 15, and that each notch 22 or 14 of given dimensions is associated with a tongue 21 or 13 of the same dimensions, arranged symmetrically relative to the axis 15.

Ainsi on additionnera les balourds associés aux deux types de profils de façon à augmenter encore le balourd global du culot seul.Thus, the unbalances associated with the two types of profiles will be added so as to further increase the overall unbalance of the base alone.

Il serait de la même façon possible d'associer sur un même prolongement 10 les variantes de profils des Figures 4 et 5.It would likewise be possible to combine on the same extension 10 the profile variants of Figures 4 and 5.

Enfin il est possible d'appliquer l'invention à d'autres types de projectiles d'artillerie à tronçons séparables.Finally, it is possible to apply the invention to other types of artillery projectiles with separable sections.

Claims (11)

  1. Device connecting the first and second sections of a spin- stabilized artillery projectile (1), which sections are intended to separate while in flight, device comprising at least one interlocking device and an initial profile (11) on the first section that is in contact with a second profile (12), which complements the preceding one, and which is rigid with the second section, wherein the first and second profiles do not have geometric symmetry in relation to the axis (15) of the projectile (1) and hence the respective centres of gravity of the first and second sections are not on the axis of the projectile, and in that once the two sections have been assembled, the centre of gravity of the assembly thus formed is on the axis of the projectile.
  2. Device in accordance with claim 1, wherein the first profile (11) is on an extension (10) of the first section and has at least one cylindrical surface (25) that is in contact with a cylindrical surface of a housing that is rigid with the second section.
  3. Device in accordance with claim 2, wherein the cylindrical surface (25) is offset in relation to the projectile.
  4. Device in accordance with claim 3, wherein the interlocking device comprises at least one key (18) that is parallel with the axis (15) of the projectile.
  5. Device in accordance with one of claims 1 - 4, wherein the first profile (11) comprises at least two tabs (13, 21) separated by notches (14, 22).
  6. Device in accordance with claim 5, wherein the tabs (13) and the notches (14) are made in the cylindrical surface (25) of the extension (10) along a radial direction of the projectile.
  7. Device in accordance with claim 5, wherein the extension (10) of the first section takes the form of a cylindrical ring, and wherin the tabs (21) and the notches (22) are made in the ring along an axial direction of the projectile.
  8. Device in accordance with either of claims 6 or 7, wherein the whole of the first profile (11) is symmetrical in relation to a radial plane (23) that passes through the axis (15) of the projectile (1), and wherein, on this first profile, each notch (14, 22) of given dimensions, is associated with a tab (13, 21) of the same dimensions arranged in a symmetrical fashion in relation to the axis (15) of the projectile.
  9. Device in accordance with one of claims 1 - 8 wherein the second profile (12) is on a ring that is rendered rigid with the second section by means of a second interlocking device.
  10. Device in accordance with one of claims 1 - 9 and used on a projectile of the rear ejection type i.e. intended to eject a payload in flight after the shell base has separated from the body of the projectile, wherein the first section comprises the shell base (4) of the projectile (1) and the second section the body (2) of the projectile.
  11. Device in accordance with claim 10 and adapted for a projectile containing cylindrical pieces of sub-ammunition inside the body, wherein the second profile (12) is partially on the body (2) of the projectile and partially on one of the pieces of sub-ammunition.
EP90400693A 1989-03-22 1990-03-15 Connection device between two parts of a gyrostabilized projectile Expired - Lifetime EP0395456B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90400693T ATE89919T1 (en) 1989-03-22 1990-03-15 CONNECTING DEVICE BETWEEN TWO SECTIONS OF A SPIN-STABILIZING PROJECTILE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8903755A FR2644881B1 (en) 1989-03-22 1989-03-22 CONNECTION DEVICE BETWEEN A FIRST AND SECOND SECTION OF A GYROSTABILIZED PROJECTILE
FR8903755 1989-03-22

Publications (2)

Publication Number Publication Date
EP0395456A1 EP0395456A1 (en) 1990-10-31
EP0395456B1 true EP0395456B1 (en) 1993-05-26

Family

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EP90400693A Expired - Lifetime EP0395456B1 (en) 1989-03-22 1990-03-15 Connection device between two parts of a gyrostabilized projectile

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EP (1) EP0395456B1 (en)
AT (1) ATE89919T1 (en)
DE (1) DE69001713T2 (en)
ES (1) ES2042231T3 (en)
FR (1) FR2644881B1 (en)
NO (1) NO169029C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682754B1 (en) * 1991-10-22 1995-03-03 Giat Ind Sa CARGO SHELL.
FR2683310B1 (en) * 1991-11-06 1993-12-31 Giat Industries DEVICE FOR EJECTING USEFUL LOAD ELEMENTS OUTSIDE THE SHELL OF A CARGO SHELL.
FR2684754B1 (en) * 1991-12-10 1995-04-07 Thomson Brandt Armements SHELL OF WHICH THE PANT IS A PARACHUTE POT OF A SUBMUNITION.
DE4429292C2 (en) * 1994-08-18 1998-04-09 Rheinmetall Ind Ag Swirl-stabilized carrier floor
US6796244B2 (en) * 2002-12-04 2004-09-28 Denel (Proprietary) Limited Opening and closing a container
US11624597B1 (en) * 2021-03-25 2023-04-11 The United States Of America As Represented By The Secretary Of The Army Hybrid annular-cantilevered snap-fit joint

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE344998C (en) * 1920-10-03 1921-12-03 Harry Moeller Double tapered bullet
SE339648B (en) * 1970-01-08 1971-10-11 Bofors Ab
SE339802B (en) * 1970-02-25 1971-10-18 Bofors Ab
SE373939B (en) * 1973-06-21 1975-02-17 Bofors Ab
DE2350138A1 (en) * 1973-10-05 1975-04-10 Bofors Ab Rotationally secure connection between two shell parts - of different hardness using ridges on harder part cutting into softer
DE2350596A1 (en) * 1973-10-09 1979-10-25 Messerschmitt Boelkow Blohm Infantry projectile with internal stabiliser - has internal inclined channel with additional rolling mass ensuring trimming action
SE391808B (en) * 1975-07-04 1977-02-28 Bofors Ab DEVICE AT THE BOTTOM UNIT FOR PROJECTILE
SE416078B (en) * 1976-08-23 1980-11-24 Foerenade Fabriksverken DEVICE FOR SUSPENSION AND SEPARATION OF MULTIPLE BODIES OF A GRANATE OR SIMILAR
DE3706033A1 (en) * 1987-02-25 1988-09-08 Diehl Gmbh & Co Projectile having a submunition body

Also Published As

Publication number Publication date
FR2644881B1 (en) 1991-05-31
NO901314L (en) 1990-09-24
ATE89919T1 (en) 1993-06-15
NO169029B (en) 1992-01-20
DE69001713T2 (en) 1993-09-02
NO169029C (en) 1992-04-29
DE69001713D1 (en) 1993-07-01
EP0395456A1 (en) 1990-10-31
FR2644881A1 (en) 1990-09-28
NO901314D0 (en) 1990-03-21
ES2042231T3 (en) 1993-12-01

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