EP1549901B1 - Sealing band for projectile and ammunition provided with such a band - Google Patents

Sealing band for projectile and ammunition provided with such a band Download PDF

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Publication number
EP1549901B1
EP1549901B1 EP03787838A EP03787838A EP1549901B1 EP 1549901 B1 EP1549901 B1 EP 1549901B1 EP 03787838 A EP03787838 A EP 03787838A EP 03787838 A EP03787838 A EP 03787838A EP 1549901 B1 EP1549901 B1 EP 1549901B1
Authority
EP
European Patent Office
Prior art keywords
band
projectile
sub
skirt
sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03787838A
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German (de)
French (fr)
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EP1549901A1 (en
Inventor
Nicolas Eches
Jean-Paul Fauchon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexter Munitions SA
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Nexter Munitions SA
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Filing date
Publication date
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Publication of EP1549901A1 publication Critical patent/EP1549901A1/en
Application granted granted Critical
Publication of EP1549901B1 publication Critical patent/EP1549901B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/02—Driving bands; Rotating bands
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
    • F42B14/061—Sabots for long rod fin stabilised kinetic energy projectiles, i.e. multisegment sabots attached midway on the projectile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
    • F42B14/067—Sealing aspects in sabots, e.g. sealing between individual segments of the sabots or sealing between the outer surface of the sabot and the inner surface of the barrel

Definitions

  • the technical field of the invention is that of sealing belts for projectiles and in particular for sub-calibrated projectiles.
  • the aim of the projectile belts is to ensure, during firing, that the propellant gases are sealed between the barrel tube wall and the projectile.
  • These belts are usually disposed in a peripheral groove of the projectile and, to be able to ensure such a seal, they are always slightly over-calibrated (about 10%).
  • a first problem encountered with known belts is that of the effectiveness of the seal provided during shooting in the worn tubes. Overcalibration is not always enough to prevent peripheral gas leaks, which reduces the speed of the projectile, impairs its effectiveness and accelerates tube wear.
  • the sub-calibrated projectiles comprise a sub-calibrated bar maintained by a caliper shoe.
  • the shoe is made up of several segments (usually three) and it releases the bar at the exit of the tube of the weapon.
  • the shoe usually has a sealing belt which is arranged in a groove arranged at a portion of the hoof size, usually called "push plate" since it is at the level of the latter that is exerted pressure propellant gases.
  • the patent EP307307 thus describes a sealing belt comprising a rear skirt connected to the socket and which ensures during firing a low pressure seal (pressure of the order of a few Mega Pascals) and a front bead housed in a groove of the projectile and ensuring, as a classic belt, high pressure sealing (pressure of the order of several hundred Mega Pascals).
  • the low pressure seal is indispensable in the first tenths of milliseconds following the ignition of the propellant charge contained by the fuel bushing. Indeed, the confinement provided by such a socket is less than that obtained with a metal sleeve and the movement of the projectile intervenes for a lower pressure. An insufficiently sensitive seal to be operational from the moment of ignition may allow gases to pass to the front of the projectile, which would reduce the efficiency of the propellant charge.
  • the sleeve is fixed at the level of the skirt, secured to the belt generally by riveting.
  • the belt according to the invention makes it possible to ensure a good seal even inside worn tubes, while being easy to mount on the projectile.
  • the belt according to the invention also allows the realization of sub-calibrated projectiles of towed type, thus lightened shoe, while ensuring nevertheless an excellent level of tightness and without creating difficulties from the point of view of the postage of the projectile.
  • the subject of the invention is a sealing belt for a projectile, characterized in that it comprises a front sub-belt comprising at least two sectors, the sub-belt having at least one conical profile cooperating with a complementary profile. a groove of the projectile, the top of the geometric cone delimiting each conical profile being disposed on the side of a rear part of the projectile, sub-belt which is held on the projectile by a cylindrical skirt.
  • the skirt may include on its inner surface means for securing it with the sub-belt.
  • the skirt may also include a circular inner collar receiving the sectors of the belt.
  • the belt may comprise a layer of a sealing material disposed at the rear of the sub-belt or the inner collar of the skirt.
  • the skirt may have a length of between 50% and 80% of the caliber.
  • each sector of the sub-belt may comprise at each of its lateral edges at least one indentation intended to cooperate with an additional indentation of a neighboring sector so as to form a propellant gastight baffle.
  • a flexible sealing material will advantageously be arranged in the baffles and at a rear face of the sub-belt.
  • the sealing belt may be sub-calibrated at least at a front portion.
  • the invention also relates to a sub-calibrated projectile equipped with such a belt, projectile comprising a towed type of shoe and having improved guidance characteristics in the tube and improved sealing.
  • the projectile arrow comprises a sub-calibrated bar held by a shoe of gauge formed of at least two segments, this projectile carries a belt with a sub-belt and is characterized in that the shoe comprises a plate of thrust which is located axially in front of a transverse plane passing through the center of gravity of the complete projectile, thrust plate having at least one groove receiving the sub-belt.
  • baffles separating the different sectors of the sub-belt may advantageously be arranged alternately with the joint planes separating the segments of the shoe.
  • Each segment of the shoe may include a gauge guide rear stud.
  • Each segment of the shoe may comprise a reinforcing rib extending longitudinally behind the thrust plate.
  • the rib may be in contact with the skirt of the belt.
  • the skirt of the belt may then have internal longitudinal grooves in which the ribs are lodged.
  • the skirt of the belt may be over-calibrated at a rear portion.
  • the invention finally relates to a munition incorporating such a projectile.
  • This munition comprises a case containing a propellant charge and incorporating a projectile, it is characterized in that the skirt of the belt is secured to a connecting ring attached to the case.
  • Part of the propellant charge can then be arranged in the waist skirt.
  • a projectile 1 which is here a calibrated stabilized stabilized projectile (or projectile arrow) comprises a shoe 3 formed of at least two segments (here three segments) surrounding a 4.
  • the projectile 1 is secured to a fuel bush 2 by means of a connecting ring 5.
  • the connecting ring 5 has a flared rear portion 6 which is secured to the fuel bushing 2 by a suitable connecting means, for example by rivets 7 regularly distributed angularly and / or by gluing.
  • the connecting ring 5 has a front portion 8 which is secured to the projectile 1 at a belt 9 for example by rivets 10 evenly spaced angularly.
  • the sealing belt 9 comprises a front sub-belt 11 comprising at least two sectors (here it comprises three sectors 11a, 11b and 11c, see FIG. figure 2 ), and which is held on the projectile 1 by a cylindrical skirt 12.
  • the skirt preferably has a length of between 50% and 80% of the caliber, ie from 60 to 100 mm for a projectile of 120 mm caliber. Such a length is substantially twice that of conventional belts.
  • the under belt 11 has two conical sections 13a, 13b which cooperate with complementary profiles 14a, 14b of a groove of the projectile 1.
  • each conical profile is disposed on the side of a rear portion (AR) of the projectile.
  • AR rear portion
  • the skirt 12 has on its inner surface a means for securing it with the sub-belt.
  • This means is constituted here by circular teeth 15 which cooperate with complementary grooves formed on the outer cylindrical surface of the sub-belt 11. Any other means solidarization would of course be possible, for example a thread.
  • each sector 11a, 11b, 11c of the sub-belt 11 comprises at each of its lateral edges at least one indentation 16 which is intended to cooperate with a complementary indentation 17 of a neighboring sector so as to constitute a baffle 18 ensuring the impervious gas seal.
  • a game is provided at each indentation between the two sectors, this game is filled with a flexible sealing material 19, for example silicone.
  • indentations represented here have the form of tongues cooperating with slots. It would be possible to make indentations of different shapes, for example toothings or curved shapes.
  • baffles 18 separating the various sectors 11a, 11b and 11c of the sub-belt 11 are alternately arranged with the joint planes 22 separating the segments 3a, 3b and 3c of the shoe 3.
  • Such an arrangement is intended to improve the sealing by avoiding points of weakness that can promote the passage of gases in the joint plane.
  • a flexible material 20, such as a silicone resin is also disposed at a bowl 21 arranged on the rear face of the sub-belt 11 (see FIG. figure 1b ).
  • the mounting of the belt is facilitated by its subdivision into a sub-belt 11 and a skirt 12.
  • the massive sectors of the sub-belt are easily put in place without the need to deform them.
  • the silicone seals are deposited and provide temporary fastening of the sub-belt and the projectile.
  • the thin skirt 12 is then slipped around the projectile and completely secures the different parts of the belt.
  • the skirt can easily be put in place without prior dilation.
  • the assembly is therefore completely cold, which is more economical and ensures better reproducibility of the mechanical characteristics of the belt.
  • the pressure of the gas is exerted radially inside the skirt 12 and has the effect of pressing it on the inner surface of the barrel of the weapon.
  • the rivets 10 break and the projectile separates from the case 2 and the connecting ring 5.
  • the pressure of the gases also axially pushes the sub belt 11 which, thanks to the conical profiles 13 and 14, radially deviates from the shoe 3 and is pressed against the wall of the tube.
  • the division of the sub-belt 11 into three sectors promotes this separation.
  • the skirt 12 is sufficiently thin (of the order of a millimeter) and flexible to allow the spacing of the sectors of the belt 11.
  • the skirt thus makes it possible to cover the defects of the coating of the tube of the weapon (dechromes) and limits the gas leaks at these places.
  • the belt skirt also protects the wall of the tube by avoiding the impact of the flames of the propellant charge which have the disadvantage of increasing the dechoming.
  • annular rupture primer will then be provided at the level of the diameter change (at the rivets 10 on the figure 1a ) for ensure the reproducibility of the separation between the portion of the skirt ensuring tightness in the tube and the flared portion ensuring the connection with the sleeve.
  • the figure 4 shows an alternative embodiment of the belt according to the invention.
  • the skirt 12 has a circular inner flange 35 which receives the sectors of the sub-belt 11. The three sectors are therefore in abutment against the flange 35 and they are also immobilized by the circular teeth 15.
  • the mounting on the shoe is carried out in the same way as for the previous embodiment.
  • the belt according to the invention has been described here adapted to a sub-calibrated projectile. It is of course possible to arrange it on a caliber projectile.
  • the belt according to the invention is nevertheless particularly suitable for equipping an arrow projectile trailed shoe type.
  • the belt 9 may be sub-calibrated at its front portion 9a.
  • Such under-calibration will be of the order of a few tenths of a millimeter, which is sufficient to facilitate the smooth insertion of the projectile into the barrel of the weapon.
  • the structural characteristics of the belt according to the invention allow the shot to make up the under calibration and thus ensure gas tightness.
  • the figure 5 thus shows a projectile 1 and a munition according to a first embodiment of the invention.
  • This munition comprises in addition to the projectile 1, a fuel case 2 closed at its rear part by a shutter base 23 which carries an igniter tube 24.
  • the case contains a propellant charge (not shown here).
  • the projectile 1 comprises a shoe 3 whose PP thrust plate (part comprising a groove receiving the sub-belt 11) is situated axially in front of a median transverse plane PM which is the plane orthogonal to the bar 4 and passing through the center of gravity of the complete projectile.
  • This shoe is of towed type. As is visible on the figure 5 the projectile 1 is introduced inside the tube 25 of the weapon 26. The connecting ring 5 bears against the forcing cone 27 which connects the tube 25 to the chamber 28.
  • the internal volume 29 delimited by the skirt 12 encloses a portion of the propellant charge. This increases the initial velocity of the projectile.
  • the volume of additional powder thus available is of the order of 0.5 to 0.8 liters for a caliber of 120 mm. This results in an initial speed increase of the order of 4 to 5%.
  • each segment of the shoe 3 also comprises a rear stud 30 to the caliber. Such an arrangement improves the guidance of the projectile inside the barrel of the weapon.
  • the guidance of the projectile 1 is thus ensured by the thrust plate alone on the first centimeters, then by the thrust plate and the studs 30 on the greater part of the tube.
  • each segment 3a, 3b, 3c of the shoe 3 comprises a reinforcing rib 33 extending longitudinally behind the thrust plate PP.
  • the ribs 33 make it possible to increase the transverse stiffness of the shoe 3.
  • each rib 33 is in contact with the skirt 12 of the belt.
  • the ribs 33 allow to guide the projectile in the barrel of the weapon dice the first moments of shooting.
  • the skirt 12 of the belt has internal longitudinal grooves 34 in which the ribs 33 fit. Such an arrangement makes it possible to weaken the skirt 12, which facilitates its rupture at the exit of the barrel of the weapon. The mounting of the belt is also facilitated. Indeed the ribs 33 provide guidance of the skirt 12 which easily caps the sectors of the sub-belt 11.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

Le domaine technique de l'invention est celui des ceintures d'étanchéité pour projectiles et notamment pour les projectiles sous calibrés.The technical field of the invention is that of sealing belts for projectiles and in particular for sub-calibrated projectiles.

Les ceintures de projectiles ont pour but d'assurer lors du tir l'étanchéité aux gaz propulsifs entre la paroi du tube de l'arme et le projectile. Ces ceintures sont disposées habituellement dans une gorge périphérique du projectile et, pour pouvoir assurer une telle étanchéité, elles sont toujours légèrement surcalibrées (d'environ 10%).The aim of the projectile belts is to ensure, during firing, that the propellant gases are sealed between the barrel tube wall and the projectile. These belts are usually disposed in a peripheral groove of the projectile and, to be able to ensure such a seal, they are always slightly over-calibrated (about 10%).

Le brevet US 4444113 , qui forme une base pour la revendication 1, décrit une telle ceinture.The patent US 4444113 which forms a base for claim 1, describes such a belt.

Un premier problème rencontré avec les ceintures connues est celui de l'efficacité de l'étanchéité assurée lors du tir dans les tubes usés. Le surcalibrage ne suffit pas toujours pour empêcher les fuites de gaz périphériques ce qui réduit la vitesse du projectile, nuit à son efficacité et accélère l'usure du tube.A first problem encountered with known belts is that of the effectiveness of the seal provided during shooting in the worn tubes. Overcalibration is not always enough to prevent peripheral gas leaks, which reduces the speed of the projectile, impairs its effectiveness and accelerates tube wear.

On cherche par ailleurs à réaliser des projectiles sous calibrés toujours plus performants c'est à dire ayant une vitesse initiale la plus grande possible (aujourd'hui cette vitesse est de l'ordre de 1800 m/s). De nombreux types de ceintures ont été développés pour de tels projectiles sous calibrés.We also seek to achieve sub-calibrated projectiles always more efficient, ie having the highest possible initial speed (today this speed is of the order of 1800 m / s). Many types of belts have been developed for such sub-calibrated projectiles.

D'une façon connue, les projectiles sous calibrés comprennent un barreau sous calibré maintenu par un sabot au calibre. Le sabot est formé de plusieurs segments (généralement trois) et il libère le barreau à la sortie du tube de l'arme. Le sabot porte habituellement une ceinture d'étanchéité qui est disposée dans une gorge aménagée au niveau d'une partie au calibre du sabot, partie appelée habituellement "plaque de poussée" puisque c'est au niveau de celle ci que s'exerce la pression des gaz propulsifs.In a known manner, the sub-calibrated projectiles comprise a sub-calibrated bar maintained by a caliper shoe. The shoe is made up of several segments (usually three) and it releases the bar at the exit of the tube of the weapon. The shoe usually has a sealing belt which is arranged in a groove arranged at a portion of the hoof size, usually called "push plate" since it is at the level of the latter that is exerted pressure propellant gases.

Le brevet EP307307 décrit ainsi une ceinture d'étanchéité comportant une jupe arrière liée à la douille et qui permet d'assurer lors du tir une étanchéité basse pression (pression de l'ordre de quelques Méga Pascals) et un bourrelet avant logé dans une gorge du projectile et assurant, comme une ceinture classique, l'étanchéité haute pression (pression de l'ordre de plusieurs centaines de Méga Pascals).The patent EP307307 thus describes a sealing belt comprising a rear skirt connected to the socket and which ensures during firing a low pressure seal (pressure of the order of a few Mega Pascals) and a front bead housed in a groove of the projectile and ensuring, as a classic belt, high pressure sealing (pressure of the order of several hundred Mega Pascals).

L'étanchéité basse pression est indispensable dans les premiers dixièmes de millisecondes suivant l'allumage de la charge propulsive contenue par la douille combustible. En effet, le confinement assuré par une telle douille est inférieur à celui obtenu avec une douille métallique et le déplacement du projectile intervient pour une pression plus faible. Un joint insuffisamment sensible pour être opérationnel dès l'allumage risque de laisser passer des gaz vers l'avant du projectile, ce qui diminuerait le rendement du chargement propulsif.The low pressure seal is indispensable in the first tenths of milliseconds following the ignition of the propellant charge contained by the fuel bushing. Indeed, the confinement provided by such a socket is less than that obtained with a metal sleeve and the movement of the projectile intervenes for a lower pressure. An insufficiently sensitive seal to be operational from the moment of ignition may allow gases to pass to the front of the projectile, which would reduce the efficiency of the propellant charge.

Un tel dispositif présente cependant des inconvénients.Such a device, however, has disadvantages.

La douille est fixée au niveau de la jupe, solidaire de la ceinture généralement par rivetage.The sleeve is fixed at the level of the skirt, secured to the belt generally by riveting.

La rupture de la jupe au passage du cône de forcement de l'arme conduit à la diminution de la largeur efficace de la ceinture. Il en résulte une diminution de la capacité de tir du projectile dans des tubes usés.The rupture of the skirt at the passage of the forcing cone of the weapon leads to the decrease of the effective width of the belt. This results in a decrease in the projectile firing capacity in spent tubes.

De plus, tous les efforts et contraintes mécaniques reçus par la munition sont transmis à la ceinture dont les caractéristiques d'étanchéité risquent de se dégrader, ce qui peut conduire à des dispersions du point de vue balistique.In addition, all the forces and mechanical stresses received by the munition are transmitted to the belt whose sealing characteristics may degrade, which may lead to ballistic dispersions.

Afin d'accroître encore plus la vitesse des projectiles on a cherché par ailleurs à définir des sabots dits tractés c'est à dire pour lesquels la plaque de poussée est située vers l'avant du projectile.In order to further increase the speed of the projectiles, it has also been sought to define so-called towed hooves, that is to say for which the thrust plate is located towards the front of the projectile.

La publication défensive US-H-1353 décrit un tel projectile qui présente comme avantage d'avoir un sabot allégé et d'autoriser l'emport d'une plus grande quantité de poudre propulsive dans la douille.Defensive publication US-H-1353 describes such a projectile which has the advantage of having a lighter shoe and allow the carriage of a larger amount of propellant powder in the socket.

Cependant un tel projectile doit se trouver positionné à l'intérieur du tube de l'arme ce qui oblige à le doter d'une ceinture de diamètre inférieur au calibre. Une telle disposition nuit à l'étanchéité en raison du sous calibrage de la ceinture. Si à l'inverse on réalise une ceinture sur calibrée, il devient difficile voire impossible de mettre à poste le projectile en raison des frottements engendrés.However, such a projectile must be positioned inside the barrel of the weapon which forces to equip it with a belt of diameter smaller than the caliber. Such an arrangement impairs the seal due to under-calibration of the belt. If conversely a belt is made on calibrated, it becomes difficult or impossible to put the projectile post because of the friction generated.

Par ailleurs le guidage de tels projectiles dans le tube est délicat à assurer et on est conduit le plus souvent à prévoir des nervures au calibre s'étendant en arrière de la plaque de poussée. De telles nervures gênent la mise en place de la ceinture d'étanchéité qui est le plus souvent montée par déformation à chaud.Furthermore, the guiding of such projectiles in the tube is difficult to ensure and it is most often led to provide ribs caliber extending behind the thrust plate. Such ribs hinder the installation of the sealing belt which is most often mounted by hot deformation.

C'est le but de l'invention que de proposer une ceinture d'étanchéité ne présentant pas de tels inconvénients.It is the object of the invention to provide a sealing belt which does not have such disadvantages.

Ainsi la ceinture selon l'invention permet d'assurer une étanchéité de bonne qualité même à l'intérieur de tubes usés, tout en étant facile à monter sur le projectile.Thus, the belt according to the invention makes it possible to ensure a good seal even inside worn tubes, while being easy to mount on the projectile.

La ceinture selon l'invention autorise également la réalisation de projectiles sous calibrés de type tractés, donc à sabot allégé, tout en assurant néanmoins un excellent niveau d'étanchéité et sans créer de difficultés du point de vue de la mise à poste du projectile.The belt according to the invention also allows the realization of sub-calibrated projectiles of towed type, thus lightened shoe, while ensuring nevertheless an excellent level of tightness and without creating difficulties from the point of view of the postage of the projectile.

Ainsi l'invention a pour objet une ceinture d'étanchéité pour un projectile, ceinture caractérisée en ce qu'elle comporte une sous-ceinture avant comprenant au moins deux secteurs, sous-ceinture présentant au moins un profil conique coopérant avec un profil complémentaire d'une gorge du projectile, le sommet du cône géométrique délimitant chaque profil conique étant disposé du côté d'une partie arrière du projectile, sous-ceinture qui est maintenue sur le projectile par une jupe cylindrique.Thus, the subject of the invention is a sealing belt for a projectile, characterized in that it comprises a front sub-belt comprising at least two sectors, the sub-belt having at least one conical profile cooperating with a complementary profile. a groove of the projectile, the top of the geometric cone delimiting each conical profile being disposed on the side of a rear part of the projectile, sub-belt which is held on the projectile by a cylindrical skirt.

La jupe pourra comporter sur sa surface interne un moyen permettant sa solidarisation avec la sous ceinture.The skirt may include on its inner surface means for securing it with the sub-belt.

La jupe pourra également comporter une collerette interne circulaire recevant les secteurs de la sous ceinture.The skirt may also include a circular inner collar receiving the sectors of the belt.

Selon un mode de réalisation, la ceinture pourra comporter une couche d'un matériau d'étanchéité disposée à l'arrière de la sous ceinture ou de la collerette interne de la jupe.According to one embodiment, the belt may comprise a layer of a sealing material disposed at the rear of the sub-belt or the inner collar of the skirt.

La jupe pourra avoir une longueur comprise entre 50% et 80% du calibre.The skirt may have a length of between 50% and 80% of the caliber.

Selon une caractéristique, chaque secteur de la sous ceinture pourra comporter au niveau de chacun de ses bords latéraux au moins une indentation destinée à coopérer avec une indentation complémentaire d'un secteur voisin de façon à constituer une chicane d'étanchéité aux gaz propulsifs.According to one characteristic, each sector of the sub-belt may comprise at each of its lateral edges at least one indentation intended to cooperate with an additional indentation of a neighboring sector so as to form a propellant gastight baffle.

Un matériau d'étanchéité souple sera avantageusement disposé dans les chicanes et au niveau d'une face arrière de la sous-ceinture.A flexible sealing material will advantageously be arranged in the baffles and at a rear face of the sub-belt.

Selon un mode particulier de réalisation, la ceinture d'étanchéité pourra être sous calibrée au moins au niveau d'une partie avant.According to a particular embodiment, the sealing belt may be sub-calibrated at least at a front portion.

L'invention a également pour objet un projectile sous calibré équipé d'une telle ceinture, projectile comportant un sabot de type tracté et ayant des caractéristiques de guidage dans le tube ainsi que d'étanchéité améliorées.The invention also relates to a sub-calibrated projectile equipped with such a belt, projectile comprising a towed type of shoe and having improved guidance characteristics in the tube and improved sealing.

Ainsi le projectile flèche selon l'invention comprend un barreau sous calibré maintenu par un sabot au calibre formé d'au moins deux segments, ce projectile porte une ceinture comportant une sous-ceinture et il est caractérisé en ce que le sabot comporte une plaque de poussée qui se situe axialement en avant d'un plan transversal passant par le centre de gravité du projectile complet, plaque de poussée comportant au moins une gorge recevant la sous-ceinture.Thus the projectile arrow according to the invention comprises a sub-calibrated bar held by a shoe of gauge formed of at least two segments, this projectile carries a belt with a sub-belt and is characterized in that the shoe comprises a plate of thrust which is located axially in front of a transverse plane passing through the center of gravity of the complete projectile, thrust plate having at least one groove receiving the sub-belt.

Les chicanes séparant les différents secteurs de la sous-ceinture pourront avantageusement être disposées en alternance avec les plans de joints séparant les segments du sabot.The baffles separating the different sectors of the sub-belt may advantageously be arranged alternately with the joint planes separating the segments of the shoe.

Chaque segment du sabot pourra comporter un plot arrière de guidage au calibre.Each segment of the shoe may include a gauge guide rear stud.

Chaque segment du sabot pourra comporter une nervure de renfort s'étendant longitudinalement en arrière de la plaque de poussée.Each segment of the shoe may comprise a reinforcing rib extending longitudinally behind the thrust plate.

La nervure pourra être en contact avec la jupe de la ceinture. La jupe de la ceinture pourra alors présenter des rainures longitudinales internes dans lesquelles se logent les nervures.The rib may be in contact with the skirt of the belt. The skirt of the belt may then have internal longitudinal grooves in which the ribs are lodged.

Avantageusement la jupe de la ceinture pourra être sur-calibrée au niveau d'une partie arrière.Advantageously the skirt of the belt may be over-calibrated at a rear portion.

L'invention a enfin pour objet une munition incorporant un tel projectile.The invention finally relates to a munition incorporating such a projectile.

Cette munition comprend un étui renfermant une charge propulsive et incorporant un projectile, elle est caractérisée en ce que la jupe de la ceinture est solidaire d'une bague de liaison fixée à l'étui.This munition comprises a case containing a propellant charge and incorporating a projectile, it is characterized in that the skirt of the belt is secured to a connecting ring attached to the case.

Une partie de la charge propulsive pourra alors être disposée dans la jupe de ceinture.Part of the propellant charge can then be arranged in the waist skirt.

L'invention sera mieux comprise à la lecture de la description qui va suivre de différents modes de réalisation, description faite en référence aux dessins annexés et dans lesquels :

  • la figure la représente partiellement en coupe longitudinale un projectile équipé d'une ceinture selon l'invention,
  • la figure 1b est une vue agrandie de la sous ceinture et de son accrochage sur le sabot,
  • la figure 2 est une vue en coupe transversale de ce projectile coupe réalisée suivant le plan dont la trace AA est repérée sur la figure 1,
  • la figure 3 est une vue de détail de la ceinture, jupe retirée, montrant les indentations réalisées au niveau des bords latéraux de deux secteurs de la sous-ceinture,
  • la figure 4 représente une variante de réalisation de la ceinture,
  • la figure 5 représente en coupe longitudinale un premier mode de réalisation d'un projectile et d'une munition selon l'invention, le projectile étant représenté mis à poste dans un tube d'arme,
  • la figure 6 représente en coupe longitudinale un deuxième mode de réalisation d'un projectile et d'une munition selon l'invention,
  • la figure 7 est une vue en coupe transversale du projectile suivant ce deuxième mode de réalisation, coupe réalisée suivant le plan dont la trace BB est repérée sur la figure 6.
The invention will be better understood on reading the following description of various embodiments, a description given with reference to the appended drawings and in which:
  • FIG. 1a partially shows in longitudinal section a projectile equipped with a belt according to the invention,
  • the figure 1b is an enlarged view of the sub-belt and its attachment on the hoof,
  • the figure 2 is a cross-sectional view of this cut shot made according to the plane whose track AA is located on the figure 1 ,
  • the figure 3 is a detailed view of the belt, skirt removed, showing the indentations made at the side edges of two sectors of the sub-belt,
  • the figure 4 represents an embodiment variant of the belt,
  • the figure 5 represents in longitudinal section a first embodiment of a projectile and a munition according to the invention, the projectile being shown placed in a weapon tube,
  • the figure 6 represents in longitudinal section a second embodiment of a projectile and a munition according to the invention,
  • the figure 7 is a cross-sectional view of the projectile according to this second embodiment, cut along the plane whose BB trace is located on the figure 6 .

En se reportant aux figures 1a et 1b, un projectile 1, qui est ici un projectile sous calibré stabilisé par empennage (ou projectile flèche) comprend un sabot 3 formé d'au moins deux segments (ici trois segments) entourant un barreau 4. Le projectile 1 est rendu solidaire d'une douille combustible 2 par l'intermédiaire d'une bague de liaison 5.Referring to figures 1a and 1b , a projectile 1, which is here a calibrated stabilized stabilized projectile (or projectile arrow) comprises a shoe 3 formed of at least two segments (here three segments) surrounding a 4. The projectile 1 is secured to a fuel bush 2 by means of a connecting ring 5.

La bague de liaison 5 présente une partie arrière 6 évasée qui est rendue solidaire de la douille combustible 2 par un moyen de liaison approprié, par exemple par des rivets 7 régulièrement répartis angulairement et/ou par collage.The connecting ring 5 has a flared rear portion 6 which is secured to the fuel bushing 2 by a suitable connecting means, for example by rivets 7 regularly distributed angularly and / or by gluing.

La bague de liaison 5 présente une partie avant 8 qui est rendue solidaire du projectile 1 au niveau d'une ceinture 9 par exemple par des rivets 10 régulièrement répartis angulairement.The connecting ring 5 has a front portion 8 which is secured to the projectile 1 at a belt 9 for example by rivets 10 evenly spaced angularly.

Conformément à l'invention la ceinture d'étanchéité 9 comporte une sous-ceinture avant 11 comprenant au moins deux secteurs (ici elle comporte trois secteurs 11a, 11b et 11c voir la figure 2), et qui est maintenue sur le projectile 1 par une jupe cylindrique 12.According to the invention, the sealing belt 9 comprises a front sub-belt 11 comprising at least two sectors (here it comprises three sectors 11a, 11b and 11c, see FIG. figure 2 ), and which is held on the projectile 1 by a cylindrical skirt 12.

La jupe a de préférence une longueur comprise entre 50% et 80% du calibre, soit de 60 à 100mm pour un projectile de calibre 120mm. Une telle longueur est sensiblement le double de celle des ceintures classiques.The skirt preferably has a length of between 50% and 80% of the caliber, ie from 60 to 100 mm for a projectile of 120 mm caliber. Such a length is substantially twice that of conventional belts.

La sous ceinture 11 présente deux profils coniques 13a, 13b qui coopèrent avec des profils complémentaires 14a, 14b d'une gorge du projectile 1.The under belt 11 has two conical sections 13a, 13b which cooperate with complementary profiles 14a, 14b of a groove of the projectile 1.

Le sommet du cône géométrique délimitant chaque profil conique est disposé du côté d'une partie arrière (AR) du projectile. Ainsi le diamètre au fond de la gorge du sabot est croissant le long d'un profil 14a ou 14b entre l'arrière AR et l'avant AV du projectile.The top of the geometric cone defining each conical profile is disposed on the side of a rear portion (AR) of the projectile. Thus the diameter at the bottom of the throat of the shoe is increasing along a profile 14a or 14b between the rear rear and the front AV of the projectile.

Ainsi la pression des gaz s'exerçant sur la sous ceinture 11 aura pour effet de pousser celle ci par rapport au sabot 3, ce qui aura pour effet, compte tenu de la conicité des profils 14a, 14b, d'écarter radialement les secteurs de la sous ceinture 11.Thus the pressure of the gases exerted on the sub-belt 11 will have the effect of pushing it with respect to the shoe 3, which will have the effect, given the taper of the profiles 14a, 14b, to radially spread the sectors of the under belt 11.

La jupe 12 comporte sur sa surface interne un moyen assurant sa solidarisation avec la sous ceinture. Ce moyen est constitué ici par des dents circulaires 15 qui coopèrent avec des sillons complémentaires aménagés sur la surface cylindrique externe de la sous ceinture 11. Tout autre moyen de solidarisation serait bien entendu envisageable, par exemple un filetage.The skirt 12 has on its inner surface a means for securing it with the sub-belt. This means is constituted here by circular teeth 15 which cooperate with complementary grooves formed on the outer cylindrical surface of the sub-belt 11. Any other means solidarization would of course be possible, for example a thread.

Comme cela est plus particulièrement visible à la figure 3, chaque secteur 11a, 11b, 11c de la sous ceinture 11 comporte au niveau de chacun de ses bords latéraux au moins une indentation 16 qui est destinée à coopérer avec une indentation complémentaire 17 d'un secteur voisin de façon à constituer une chicane 18 assurant l'étanchéité aux gaz propulsifs. Un jeu est prévu au niveau de chaque indentation entre les deux secteurs, ce jeu est rempli avec un matériau d'étanchéité souple 19, par exemple du silicone.As this is particularly visible in the figure 3 each sector 11a, 11b, 11c of the sub-belt 11 comprises at each of its lateral edges at least one indentation 16 which is intended to cooperate with a complementary indentation 17 of a neighboring sector so as to constitute a baffle 18 ensuring the impervious gas seal. A game is provided at each indentation between the two sectors, this game is filled with a flexible sealing material 19, for example silicone.

Les indentations représentées ici ont la forme de languettes coopérant avec des créneaux. Il serait possible de réaliser des indentations de formes différentes, par exemple des dentures ou bien des formes courbes.The indentations represented here have the form of tongues cooperating with slots. It would be possible to make indentations of different shapes, for example toothings or curved shapes.

Comme cela est visible à la figure 2, les chicanes 18 séparant les différents secteurs 11a 11b et 11c de la sous-ceinture 11 sont disposées en alternance avec les plans de joints 22 séparant les segments 3a, 3b et 3c du sabot 3. Une telle disposition a pour but d'améliorer l'étanchéité en évitant des points de faiblesse pouvant favoriser le passage des gaz dans le plan de joint.As can be seen in figure 2 the baffles 18 separating the various sectors 11a, 11b and 11c of the sub-belt 11 are alternately arranged with the joint planes 22 separating the segments 3a, 3b and 3c of the shoe 3. Such an arrangement is intended to improve the sealing by avoiding points of weakness that can promote the passage of gases in the joint plane.

Afin de parfaire l'étanchéité de la sous-ceinture 11 un matériau souple 20, telle une résine silicone, est également disposé au niveau d'une cuvette 21 aménagée sur la face arrière de la sous-ceinture 11 (voir la figure 1b).In order to complete the sealing of the sub-belt 11, a flexible material 20, such as a silicone resin, is also disposed at a bowl 21 arranged on the rear face of the sub-belt 11 (see FIG. figure 1b ).

Le montage de la ceinture est facilité par sa subdivision en une sous-ceinture 11 et une jupe 12. Les secteurs massifs de la sous ceinture sont aisément mis en place sans qu'il soit nécessaire de les déformer. Les joints de silicones sont déposés et assurent une solidarisation temporaire de la sous ceinture et du projectile. La jupe mince 12 est ensuite glissée autour du projectile et réalise la solidarisation complète des différentes parties de la ceinture. La jupe peut aisément être mise en place sans dilatation préalable. Le montage s'opère donc complètement à froid, ce qui est plus économique et assure une meilleure reproductibilité des caractéristiques mécaniques de la ceinture.The mounting of the belt is facilitated by its subdivision into a sub-belt 11 and a skirt 12. The massive sectors of the sub-belt are easily put in place without the need to deform them. The silicone seals are deposited and provide temporary fastening of the sub-belt and the projectile. The thin skirt 12 is then slipped around the projectile and completely secures the different parts of the belt. The skirt can easily be put in place without prior dilation. The assembly is therefore completely cold, which is more economical and ensures better reproducibility of the mechanical characteristics of the belt.

Le fonctionnement de cette ceinture est le suivant.The operation of this belt is as follows.

Lors du tir du projectile, la pression des gaz s'exerce radialement à l'intérieur de la jupe 12 et a pour effet de la plaquer sur la surface interne du tube de l'arme.When firing the projectile, the pressure of the gas is exerted radially inside the skirt 12 and has the effect of pressing it on the inner surface of the barrel of the weapon.

Les rivets 10 se rompent et le projectile se sépare de l'étui 2 et de la bague de liaison 5.The rivets 10 break and the projectile separates from the case 2 and the connecting ring 5.

La pression des gaz pousse également axialement la sous ceinture 11 qui, grâce aux profils coniques 13 et 14, s'écarte radialement du sabot 3 et vient se plaquer contre la paroi du tube. La division de la sous ceinture 11 en trois secteurs favorise cet écartement.The pressure of the gases also axially pushes the sub belt 11 which, thanks to the conical profiles 13 and 14, radially deviates from the shoe 3 and is pressed against the wall of the tube. The division of the sub-belt 11 into three sectors promotes this separation.

L'étanchéité reste cependant assurée grâce aux chicanes 18 et aux remplissages de matériau d'étanchéité 20 et 19 qui autorisent un tel déplacement des secteurs 11a, 11b, 11c.Sealing remains, however, ensured by the baffles 18 and the filling of sealing material 20 and 19 which allow such a displacement sectors 11a, 11b, 11c.

La jupe 12 est suffisamment mince (de l'ordre du millimètre) et souple pour autoriser l'écartement des secteurs de la sous ceinture 11.The skirt 12 is sufficiently thin (of the order of a millimeter) and flexible to allow the spacing of the sectors of the belt 11.

A la sortie du tube de l'arme les efforts aérodynamiques écartent les segments 3a, 3b et 3c du sabot, la jupe 12 mince se déchire aisément. La sous ceinture 11 qui est subdivisée en secteurs ne perturbe pas la séparation sabot/barreau.At the exit of the weapon tube the aerodynamic forces away segments 3a, 3b and 3c of the shoe, the skirt 12 thin easily tear. The sub-belt 11 which is subdivided into sectors does not disturb the hoof / bar separation.

On obtient donc ainsi une étanchéité aux gaz parfaite même dans les tubes usés. Grâce à l'invention l'étanchéité se trouve améliorée d'une part avec la subdivision de la ceinture en trois secteurs mobiles et d'autre part grâce à la jupe qui s'applique sur la paroi interne du tube sur une surface importante.This gives a perfect gas tightness even in worn tubes. Thanks to the invention the sealing is improved on the one hand with the subdivision of the belt into three moving sectors and on the other hand thanks to the skirt which is applied to the inner wall of the tube over a large area.

La jupe permet ainsi de couvrir les défauts du revêtement du tube de l'arme (déchromages) et limite les fuites de gaz à ces endroits.The skirt thus makes it possible to cover the defects of the coating of the tube of the weapon (dechromes) and limits the gas leaks at these places.

La jupe de ceinture permet également de protéger la paroi du tube en évitant l'impact des flammes du chargement propulsif qui ont pour inconvénient d'accroître le déchromage.The belt skirt also protects the wall of the tube by avoiding the impact of the flames of the propellant charge which have the disadvantage of increasing the dechoming.

A titre de variante il serait possible de réaliser en une seule pièce la jupe 12 et la pièce de liaison 5. On prévoira alors une amorce de rupture annulaire au niveau du changement de diamètre (au niveau des rivets 10 sur la figure 1a) pour assurer la reproductibilité de la séparation entre la partie de jupe assurant l'étanchéité dans le tube et la partie évasée assurant la liaison avec la douille.Alternatively, it would be possible to make the skirt 12 and the connecting piece 5 in one piece. An annular rupture primer will then be provided at the level of the diameter change (at the rivets 10 on the figure 1a ) for ensure the reproducibility of the separation between the portion of the skirt ensuring tightness in the tube and the flared portion ensuring the connection with the sleeve.

La figure 4 montre une variante de réalisation de la ceinture selon l'invention.The figure 4 shows an alternative embodiment of the belt according to the invention.

Selon cette variante, la jupe 12 comporte une collerette interne circulaire 35 qui reçoit les secteurs de la sous-ceinture 11. Les trois secteurs se trouvent donc en appui contre la collerette 35 et ils sont également immobilisés par les dents circulaires 15.According to this variant, the skirt 12 has a circular inner flange 35 which receives the sectors of the sub-belt 11. The three sectors are therefore in abutment against the flange 35 and they are also immobilized by the circular teeth 15.

Le montage sur le sabot s'effectue de la même façon que pour le mode de réalisation précédent.The mounting on the shoe is carried out in the same way as for the previous embodiment.

Une couche d'un matériau souple 20, telle une résine silicone, est disposée après montage à l'arrière de la collerette 35 et entre celle ci et le sabot 3. Ce matériau pénètre également jusqu'à la sous ceinture 11 et permet de parfaire l'étanchéité aux gaz propulsifs.A layer of a flexible material 20, such as a silicone resin, is disposed after mounting at the rear of the flange 35 and between the latter and the shoe 3. This material also penetrates to the under belt 11 and allows to perfect the impervious gas seal.

L'avantage de cette variante est qu'elle permet d'améliorer l'étanchéité arrière ainsi que le maintien des secteurs de sous ceinture.The advantage of this variant is that it improves the rear seal and the maintenance of sub-belt sectors.

La ceinture selon l'invention a été décrite ici adaptée sur un projectile sous calibré. Il est bien entendu possible de la disposer sur un projectile au calibre.The belt according to the invention has been described here adapted to a sub-calibrated projectile. It is of course possible to arrange it on a caliber projectile.

La ceinture selon l'invention est néanmoins particulièrement adaptée pour équiper un projectile flèche de type à sabot tracté. En effet selon une variante de l'invention la ceinture 9 peut être sous calibrée au niveau de sa partie avant 9a. Un tel sous calibrage sera de l'ordre de quelques dixièmes de mm ce qui est suffisant pour faciliter l'introduction sans difficultés du projectile à l'intérieur du tube de l'arme.The belt according to the invention is nevertheless particularly suitable for equipping an arrow projectile trailed shoe type. Indeed according to a variant of the invention the belt 9 may be sub-calibrated at its front portion 9a. Such under-calibration will be of the order of a few tenths of a millimeter, which is sufficient to facilitate the smooth insertion of the projectile into the barrel of the weapon.

Les caractéristiques structurelles de la ceinture selon l'invention permettent dès le tir de rattraper le sous calibrage et assurer ainsi l'étanchéité aux gaz.The structural characteristics of the belt according to the invention allow the shot to make up the under calibration and thus ensure gas tightness.

On pourra également donner à la jupe 12 de la ceinture un léger sur-calibrage au niveau de sa partie arrière 9b (voir figure 1a). Une telle disposition permet d'améliorer l'étanchéité basse pression au début de la combustion de la poudre.We can also give the skirt 12 of the belt a slight over-calibration at its rear portion 9b (see figure 1a ). Such an arrangement makes it possible to improve the low pressure seal at the beginning of the combustion of the powder.

La figure 5 montre ainsi un projectile 1 et une munition selon un premier mode de réalisation de l'invention.The figure 5 thus shows a projectile 1 and a munition according to a first embodiment of the invention.

Cette munition comprend outre le projectile 1, un étui combustible 2 fermé au niveau de sa partie arrière par un culot obturateur 23 qui porte un tube allumeur 24. L'étui renferme un chargement propulsif (non représenté ici).This munition comprises in addition to the projectile 1, a fuel case 2 closed at its rear part by a shutter base 23 which carries an igniter tube 24. The case contains a propellant charge (not shown here).

Conformément à l'invention le projectile 1 comporte un sabot 3 dont la plaque de poussée PP (partie comportant une gorge recevant la sous ceinture 11) se situe axialement en avant d'un plan transversal médian PM qui est le plan orthogonal au barreau 4 et passant par le centre de gravité du projectile complet.According to the invention, the projectile 1 comprises a shoe 3 whose PP thrust plate (part comprising a groove receiving the sub-belt 11) is situated axially in front of a median transverse plane PM which is the plane orthogonal to the bar 4 and passing through the center of gravity of the complete projectile.

Ce sabot est de type tracté. Comme cela est visible sur la figure 5, le projectile 1 est introduit à l'intérieur du tube 25 de l'arme 26. La bague de liaison 5 est en appui contre le cône de forcement 27 qui raccorde le tube 25 à la chambre 28.This shoe is of towed type. As is visible on the figure 5 the projectile 1 is introduced inside the tube 25 of the weapon 26. The connecting ring 5 bears against the forcing cone 27 which connects the tube 25 to the chamber 28.

Comme cela a déjà été précisé précédemment, la mise en place de la munition a été faite sans difficulté grâce au sous calibrage de la ceinture 9. L'étanchéité aux gaz sera assurée grâce à la structure de cette ceinture.As already mentioned above, the emplacement of the ammunition has been made without difficulty thanks to the under-calibration of the belt 9. The gastightness will be ensured thanks to the structure of this belt.

Le volume interne 29 délimité par la jupe 12 renferme une partie de la charge propulsive. On augmente ainsi la vitesse initiale du projectile. Le volume de poudre supplémentaire ainsi disponible est de l'ordre de 0,5 à 0,8 litres pour un calibre de 120mm. Il en résulte un accroissement de vitesse initiale de l'ordre de 4 à 5%.The internal volume 29 delimited by the skirt 12 encloses a portion of the propellant charge. This increases the initial velocity of the projectile. The volume of additional powder thus available is of the order of 0.5 to 0.8 liters for a caliber of 120 mm. This results in an initial speed increase of the order of 4 to 5%.

Un tel accroissement de performances s'ajoute à celui résultant du gain de masse lié à la technologie du sabot tracté. On peut vérifier par le calcul que le gain de masse optimal pour un sabot de calibre 120mm est obtenu en avançant la plaque de poussée de 80mm environ par rapport à sa position habituelle au niveau du cône de forcement. Il en résulte un allégement du sabot de 15 à 20% pour un coût de fabrication analogue.Such an increase in performance is added to that resulting from the mass gain linked to the technology of the towed shoe. It can be verified by calculation that the optimum mass gain for a 120mm shoe is achieved by moving the thrust plate about 80mm from its usual position at the forcing cone. This results in a lightening of the shoe from 15 to 20% for a similar manufacturing cost.

Selon le premier mode de réalisation du projectile selon l'invention chaque segment du sabot 3 comporte également un plot arrière 30 au calibre. Une telle disposition permet d'améliorer le guidage du projectile à l'intérieur du tube de l'arme.According to the first embodiment of the projectile according to the invention each segment of the shoe 3 also comprises a rear stud 30 to the caliber. Such an arrangement improves the guidance of the projectile inside the barrel of the weapon.

Le guidage du projectile 1 est assuré ainsi par la plaque de poussée seule sur les premiers centimètres, puis par la plaque de poussée et les plots 30 sur la plus grande partie du tube.The guidance of the projectile 1 is thus ensured by the thrust plate alone on the first centimeters, then by the thrust plate and the studs 30 on the greater part of the tube.

Les figures 6 et 7 montrent un projectile selon un deuxième mode de réalisation de l'invention. Ce projectile diffère de celui selon la figure 5 en ce que chaque segment 3a, 3b, 3c du sabot 3 comporte une nervure de renfort 33 s'étendant longitudinalement en arrière de la plaque de poussée PP.The figures 6 and 7 show a projectile according to a second embodiment of the invention. This projectile differs from that according to figure 5 in that each segment 3a, 3b, 3c of the shoe 3 comprises a reinforcing rib 33 extending longitudinally behind the thrust plate PP.

Les nervures 33 permettent d'augmenter la rigidité transversale du sabot 3.The ribs 33 make it possible to increase the transverse stiffness of the shoe 3.

Comme cela est plus particulièrement visible à la figure 7, chaque nervure 33 est en contact avec la jupe 12 de la ceinture. Ainsi les nervures 33 permettent d'assurer le guidage du projectile dans le tube de l'arme dés les premiers instants du tir.As this is particularly visible in the figure 7 each rib 33 is in contact with the skirt 12 of the belt. Thus the ribs 33 allow to guide the projectile in the barrel of the weapon dice the first moments of shooting.

La jupe 12 de la ceinture présente des rainures longitudinales internes 34 dans lesquelles se logent les nervures 33. Une telle disposition permet de fragiliser la jupe 12 ce qui facilite sa rupture à la sortie du tube de l'arme. Le montage de la ceinture se trouve également facilité. En effet les nervures 33 assurent le guidage de la jupe 12 qui vient aisément coiffer les secteurs de la sous ceinture 11.The skirt 12 of the belt has internal longitudinal grooves 34 in which the ribs 33 fit. Such an arrangement makes it possible to weaken the skirt 12, which facilitates its rupture at the exit of the barrel of the weapon. The mounting of the belt is also facilitated. Indeed the ribs 33 provide guidance of the skirt 12 which easily caps the sectors of the sub-belt 11.

Claims (17)

  1. Sealing band (9) for a projectile (1), the band being characterised in that it comprises a front sub-band (11) containing at least two sectors, the sub-band having at least a conical profile (13a, 13b) in a tight fit with the matching profile (14a, 14b) of a groove of the projectile, the geometric cone tip delimiting each conical profile being placed towards a rear section of the projectile, with the sub-band (11) attached to the projectile by a cylindrical skirt (12).
  2. Sealing band according to claim 1, characterised in that the skirt (12) has on its internal surface means (15) to allow its friction-type connection with the sub-band (11).
  3. Sealing band according to claim 2, characterised in that the skirt (12) has an internal circular collar (35) receiving the sectors of the sub-band (11).
  4. Sealing band according to any of claims 1 to 3, characterised in that it has a layer (20) of a sealing material placed at the rear of the sub-band (11) or the internal collar (35) of the skirt (12).
  5. Sealing band according to any of claims 1 to 4, characterised in that the skirt (12) has a length between 50% and 80% of the calibre.
  6. Sealing band according to any of claims 1 to 5, characterised in that each sub-band (11) sector has at the level of each of its lateral edges at least one indentation (16) intended to cooperate with a corresponding indentation (17) of a neighbouring sector so as to form a sealing deflecting plate (18) for the propellant gases.
  7. Sealing band according to claim 6, characterised in that a flexible sealing material (19) is placed in the deflecting plates (18) and at the level of a rear section of the sub-band (11).
  8. Sealing band according to any of claims 1 to 7, characterised in that the skirt (12) of the band (9) is over-calibre at the level of a rear section (9b).
  9. Sealing band according to any of claims 1 to 8, characterised in that it is of sub-calibre at least at the level of a front section (9a).
  10. Arrow projectile (1) comprising a sub-calibre core (4) held by a sabot (3) with a calibre made of at least two segments, said projectile having a band (9) according to claim 9 and characterised in that the sabot (3) has a pusher plate (PP) located axially in front of the transversal plane (PM) passing through the gravity centre of the complete projectile, the pusher plate containing at least one groove for the sub-band (11) to fit in.
  11. Arrow projectile according to claim 10 and integrating a band according to claim 6, characterised in that the deflecting plates (18) separating the various sub-band (11) sectors are alternatively integrated with the plan lines (22) separating the segments of the sabot (3).
  12. Arrow projectile according to any of claims 10 to 11, characterised in that each segment from the sabot (3) has a rear calibre guiding support (30).
  13. Arrow projectile according to any of claims 10 to 12, characterised in that each segment of the sabot (3) has a reinforcing rib (33) extending longitudinally to the back of the pusher plate (PP).
  14. Arrow projectile according to claim 13, characterised in that the rib (33) is in contact with the skirt (12) of the band (9).
  15. Arrow projectile according to claim 14, characterised in that the skirt (12) of the band is provided with longitudinal internal grooves (34) in which the ribs (33) are fitted in.
  16. Ammunition consisting of a casing (2) enclosing a propellant charge and including a projectile according to any of claims 10 to 15, the ammunition characterised in that the skirt (12) of the band is attached to a fastening ring (6) fixed at the casing (2).
  17. Ammunition according to claim 16, characterised in that part of the propellant charge is placed in the skirt (12) of the band.
EP03787838A 2002-07-26 2003-06-24 Sealing band for projectile and ammunition provided with such a band Expired - Lifetime EP1549901B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0209505A FR2842896B1 (en) 2002-07-26 2002-07-26 SEALING BELT FOR A PROJECTILE, PROJECTILE UNDER CALIBER AND AMMUNITION PROVIDED WITH SUCH A BELT
FR0209505 2002-07-26
PCT/FR2003/001941 WO2004017015A1 (en) 2002-07-26 2003-06-24 Sealing band for projectile and ammunition provided with such a band

Publications (2)

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EP1549901A1 EP1549901A1 (en) 2005-07-06
EP1549901B1 true EP1549901B1 (en) 2009-02-18

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EP03787838A Expired - Lifetime EP1549901B1 (en) 2002-07-26 2003-06-24 Sealing band for projectile and ammunition provided with such a band

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US (1) US7503262B2 (en)
EP (1) EP1549901B1 (en)
AU (1) AU2003260624A1 (en)
DE (1) DE60326254D1 (en)
FR (1) FR2842896B1 (en)
IL (1) IL166406A (en)
WO (1) WO2004017015A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2842896B1 (en) * 2002-07-26 2004-10-22 Giat Ind Sa SEALING BELT FOR A PROJECTILE, PROJECTILE UNDER CALIBER AND AMMUNITION PROVIDED WITH SUCH A BELT
DE10320194A1 (en) * 2003-05-07 2004-12-02 Rheinmetall W & M Gmbh Disposable sabot
DE102009009776A1 (en) * 2009-02-20 2010-08-26 Rheinmetall Waffe Munition Gmbh cartridge
DE102009009772A1 (en) * 2009-02-20 2010-09-02 Rheinmetall Waffe Munition Gmbh Method for introducing predetermined breaking points in an annular retaining and sealing strip of a sabot projectile and Laborierwerkzeug for performing the method
US8661984B2 (en) 2011-06-22 2014-03-04 The United States Of America As Represented By The Secretary Of The Army Sabot
EP2858898B1 (en) * 2012-06-07 2017-10-18 AeroVironment, Inc. System for detachably coupling an unmanned aerial vehicle within a launch tube
DE102015110627A1 (en) * 2015-07-01 2017-01-05 Rwm Schweiz Ag From a drawn gun barrel moldable, wing stabilized subcaliber bullet and method for its production
GB2578572B (en) * 2018-10-30 2022-08-17 Bae Systems Plc A sabot
DE102019125128A1 (en) * 2019-09-18 2021-03-18 Rheinmetall Waffe Munition Gmbh Sabot

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738279A (en) * 1970-07-24 1973-06-12 Us Navy Sabot for sub-calibre projectile
US4187783A (en) * 1978-03-13 1980-02-12 The United States Of America As Represented By The Secretary Of The Army Discarding sabot munition
DE3033041C2 (en) * 1980-09-03 1986-04-10 L'Etat Français représenté par le Délégué Général pour l'Armement, Paris Metal and plastic sabot
DE3037662A1 (en) * 1980-10-04 1982-05-13 Rheinmetall GmbH, 4000 Düsseldorf CARTRIDGED AMMUNITION
US4444113A (en) * 1981-04-06 1984-04-24 The United States Of America As Represented By The Secretary Of The Army High-pressure self-sealing obturator in sabot discard projectile
DE3525854A1 (en) * 1985-07-19 1989-01-05 Mauser Werke Oberndorf WING-STABILIZED ARROW BULLET
GB2241308B (en) * 1986-02-20 1992-01-29 Royal Ordnance Plc Projectiles and components therefor
FR2620214B1 (en) 1987-09-09 1990-04-13 France Etat Armement CONNECTING RING BETWEEN A PROJECTILE AND A SOCKET
FR2665761B1 (en) * 1990-08-13 1994-09-16 Giat Ind Sa SEALING BELT FOR ARROW PROJECTILE.
US5359938A (en) * 1990-10-24 1994-11-01 Olin Corporation Ultra light weight sabot
USH1353H (en) 1993-07-26 1994-09-06 The United States Of America As Represented By The Secretary Of The Army Velocity enhancing projectile sabot
FR2801667B1 (en) * 1999-11-25 2002-01-18 Giat Ind Sa CONNECTION DEVICE BETWEEN A SOCKET AND A PROJECTILE AND METHOD OF MOUNTING A BELT ON A PROJECTILE USING SUCH A CONNECTION DEVICE
DE10157668B4 (en) * 2001-11-24 2014-05-22 Rheinmetall Waffe Munition Gmbh bullet
FR2842896B1 (en) * 2002-07-26 2004-10-22 Giat Ind Sa SEALING BELT FOR A PROJECTILE, PROJECTILE UNDER CALIBER AND AMMUNITION PROVIDED WITH SUCH A BELT
FR2851038B1 (en) * 2003-02-10 2005-03-18 Giat Ind Sa SABOT FOR PROJECTILE UNDER SIZE
DE10320194A1 (en) * 2003-05-07 2004-12-02 Rheinmetall W & M Gmbh Disposable sabot

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DE60326254D1 (en) 2009-04-02
FR2842896A1 (en) 2004-01-30
US7503262B2 (en) 2009-03-17
FR2842896B1 (en) 2004-10-22
US20060032394A1 (en) 2006-02-16
AU2003260624A1 (en) 2004-03-03
EP1549901A1 (en) 2005-07-06
WO2004017015A1 (en) 2004-02-26
IL166406A0 (en) 2006-01-15
IL166406A (en) 2012-05-31

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