EP3715772B1 - Hood and projectile comprising such a hood - Google Patents

Hood and projectile comprising such a hood Download PDF

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Publication number
EP3715772B1
EP3715772B1 EP20158973.6A EP20158973A EP3715772B1 EP 3715772 B1 EP3715772 B1 EP 3715772B1 EP 20158973 A EP20158973 A EP 20158973A EP 3715772 B1 EP3715772 B1 EP 3715772B1
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EP
European Patent Office
Prior art keywords
cover
projectile
cowling
intended
base
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EP20158973.6A
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German (de)
French (fr)
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EP3715772A1 (en
Inventor
Richard Roy
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Nexter Munitions SA
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Nexter Munitions SA
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Publication of EP3715772A1 publication Critical patent/EP3715772A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/067—Mounting or locking missiles in cartridge cases
    • F42B5/073—Mounting or locking missiles in cartridge cases using an auxiliary locking element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02—Stabilising arrangements
    • F42B10/14—Stabilising arrangements using fins spread or deployed after launch, e.g. after leaving the barrel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02—Stabilising arrangements
    • F42B10/26—Stabilising arrangements using spin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • 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

Definitions

  • the field of the invention is that of cowlings making it possible to cover a rear part of a gyrostabilized projectile and of projectiles fitted with such cowlings.
  • caliber gyrostabilized projectiles (caliber from 40 mm to 155 mm) have a belt which is located on their body, in front of a rear part or base of the projectile. This belt is responsible for driving the projectile in rotation and ensuring gas pressure tightness between the projectile and the internal wall of a tube of a weapon which fires the projectile, in order to ensure propulsion. the most effective of the projectile by guaranteeing the absence of gas leaks.
  • This type of projectile sometimes includes equipment located at the rear part (or base) such as for example fins or a parachute. This equipment is located behind the belt and is therefore exposed to the very high pressure of the firing gases, which risks damaging them.
  • Such a cowling is imperfect because the firing gases can infiltrate radially into the cowling at the edge of the cowling and damage the equipment or cause premature separation between the base and the cowling.
  • this cowling is made of a material which disintegrates during firing. However, it is essential that the destruction of the cowling does not occur too soon so that the protection of the equipment is ensured.
  • the invention proposes to solve this problem by proposing a cowling which can at the same time ensure the protection of the equipment but whose ejection following the firing is ensured in a reliable and reproducible manner.
  • the invention also solves a problem of maintaining the cowling in the axial position.
  • the invention also solves a problem of protecting the base of the projectile against thermal and mechanical attack from grains of powder during firing.
  • the invention therefore relates to a cowling intended to protect a base of a gyrostabilized projectile which comprises a sealing belt intended to correspond with the scratches of a weapon, the cowling comprising a bottom intended to be positioned at the rear of the projectile and a flank which extends from the bottom to a front edge intended to be positioned in the vicinity of the rear of the belt, cowling characterized in that it comprises an annular bulge or ferrule which is located at the level of the edge front of the cowling and which is dimensioned in such a way that it can be applied in a radially tight manner against the base of the projectile to prevent the penetration of gases into the cowling.
  • the ferrule includes a collar carried by the inside of the front edge, a collar intended to cooperate with a groove of the projectile located just behind the belt to prevent the axial shrinkage of the cowling.
  • the ferrule once placed on the base has an outside diameter equal to that of the belt.
  • the ferrule has a shoulder oriented towards the rear of the projectile and intended to correspond with an installation tool.
  • the cowling comprises at least two different materials.
  • the ferrule may comprise an elastic polyamide material.
  • the flank and the bottom may also comprise an elastic silicone material.
  • the bottom of the cowling may include an anti-impact reinforcement.
  • the invention also relates to a gyrostabilized projectile comprising a sealing belt intended to correspond with the scratches of a weapon and comprising a cowling according to one of the preceding characteristics.
  • a gyrostabilized projectile 100 comprises a belt 200 of the type described for example in the patent FR2882430 where the belt is slipping.
  • a non-slip belt may also be used.
  • the base 101 of the projectile 100 houses pivoting fins 10, located in housings 21 of the base 101, and called to unfold towards the outside of the projectile 100 after the exit of the tube thanks to in ways not described.
  • a cowling 1 covers the base 101.
  • the cowling 1 comprises a bottom 2 located opposite a rear face AR of the base 101.
  • a sidewall 3 surrounds the peripheral surface of the base 101 and it extends from the bottom 2 to an edge front 4 which is located in the vicinity of the rear of the belt 200.
  • the bottom 2 and the side 3 of the cowling 1 thus cover the entire base 101.
  • the cowling 1 also comprises an annular bulge 5, hereinafter referred to as shell 5, which forms the edge 4 of the cowling.
  • This shroud 5 comprises an elastic material which is dimensioned in such a way that, when the cowling is in place, the shroud radially tightens the base sufficiently to prevent the penetration of gas into the cowling at the level of the front edge 4.
  • shroud 5 a material comprising polyamide for its plastic characteristics and resistance to heat and pressure.
  • the bottom 2 of the cowling 1 may include a reinforcement 6 comprising a metal sheet for example, reinforcement possibly extending in part on the sidewall 3.
  • the cowling 1 comprises a flange 7 positioned on the inside of the front edge 4, flange 7 which is intended to correspond with a groove 102 of the projectile 100, groove which is located just behind the belt 200.
  • the collar 7 thus locks the cowling 1 on the projectile 100 and prevents any withdrawal of the cowling 1 along the longitudinal axis X of the cowling 1.
  • the outer diameter D of the ferrule 5 is substantially equal to the outer diameter D of the belt 200.
  • a projectile 100 comprising a cowling 1 according to the invention is located in a tube 300 of a weapon which comprises helical stripes 301 intended to impart a rotational movement to the projectile to gyro-stabilize it.
  • the coupling between the stripes 301 and the projectile takes place at the level of the belt 200 which comprises a ductile material which adopts the shape of the stripes 301 by deformation.
  • the ferrule 5 having substantially the same outer diameter D as the belt 200 is also deformed by the scratches 301 of the weapon 300 which form crenellations over its entire circumference.
  • this deformation induces additional pressure of the ferrule 5 on the front edge 4 of the cowling 1 which contributes to preventing the penetration of firing gas into the cowling 1, thus protecting the base 101 and its equipment 10.
  • the zones of deformation of the shroud 5 by the scratches 301 constitute as many zones of accumulation of mechanical stresses which weaken the shroud 5, facilitating its ejection as we shall see later.
  • the reinforcement 6 mentioned above acts as an anti-impact shield preventing the perforation of the cowling 1 by the 500 grains.
  • the centrifugal force applied to the ferrule 5, due to the gyrostabilization and the effects of the aerodynamic flow, and the absence of support by the tube will cause the ferrule 5 to burst, which has been weakened by the passage in the tube, and the front edge 4 of the cowling which will cause a separation of the cowling 1 with respect to the base 101, favorable to the deployment of the fins.
  • the cowling 1 may be made of a single block of a material comprising polyamide but may also be a part comprising several materials integral with each other, such as for example a ferrule 5 made of polyamide and integral with a cup made of silicone. formed by the sides 3 and the bottom 2.
  • Silicone is particularly advantageous for its resistance to heat and pressure and has the advantage of breaking very easily during the phase of separation of the base 101 at the tube outlet.
  • the manufacture of the cowling 1 can thus be easily carried out by bi-material injection of the cup and the ferrule.
  • the injection can be carried out in a mold incorporating the reinforcement 6 which will be imprisoned in the bucket.
  • the reinforcement may be bonded to the bucket after manufacture.
  • the reinforcement can be glued inside or outside the bucket.
  • the cowling 1 has an internal diameter slightly smaller than the external diameter of the base 101 so that the ferrule 5, once in place, can be in voltage to sufficiently tighten the base 101 to prevent the penetration of gases.
  • the ferrule 5 comprises a shoulder 8 oriented towards the rear AR which serves as a support face for a tool 12 which pushes the cowling 1, along the longitudinal axis X, and along the walls of the base 101 which are partly slightly conical which causes the progressive expansion of the ferrule 5, of the edge 4 and of the collar 7.
  • the tool 12 has a substantially tubular shape and has its outer wall which includes slots 13 which facilitate its progressive deformation as the ferrule 4 and the shoulder 8 expand.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Description

Le domaine de l'invention est celui des capotages permettant de couvrir une partie arrière d'un projectile gyrostabilisé et des projectiles équipés de tels capotages.The field of the invention is that of cowlings making it possible to cover a rear part of a gyrostabilized projectile and of projectiles fitted with such cowlings.

Les projectiles gyrostabilisés de gros calibre (calibre de 40 mm à 155 mm) comportent une ceinture qui est située sur leur corps, en avant d'une partie arrière ou culot du projectile. Cette ceinture est chargée d'entraîner le projectile en rotation et d'assurer l'étanchéité à la pression des gaz entre le projectile et la paroi interne d'un tube d'une arme qui tire le projectile, ceci afin d'assurer la propulsion la plus efficace du projectile en garantissant l'absence de fuites de gaz.Large caliber gyrostabilized projectiles (caliber from 40 mm to 155 mm) have a belt which is located on their body, in front of a rear part or base of the projectile. This belt is responsible for driving the projectile in rotation and ensuring gas pressure tightness between the projectile and the internal wall of a tube of a weapon which fires the projectile, in order to ensure propulsion. the most effective of the projectile by guaranteeing the absence of gas leaks.

Ce type de projectile comporte parfois des équipements situés au niveau de la partie arrière (ou culot) comme par exemple des ailettes ou un parachute. Ces équipements sont situés en arrière de la ceinture et sont donc exposés à la très forte pression des gaz de tir ce qui risque de les endommager.This type of projectile sometimes includes equipment located at the rear part (or base) such as for example fins or a parachute. This equipment is located behind the belt and is therefore exposed to the very high pressure of the firing gases, which risks damaging them.

Pour remédier à cela il est connu du brevet US6435097 de les protéger en les plaçant sous un capotage comportant un fond et un flanc qui s'étend du fond jusqu'à un bord situé en arrière de la ceinture.To remedy this it is known from the patent US6435097 to protect them by placing them under a cowling comprising a bottom and a side which extends from the bottom to an edge situated behind the belt.

Un tel capotage est imparfait car les gaz de tir peuvent s'infiltrer radialement dans le capotage au niveau du bord du capotage et endommager les équipements ou provoquer une désolidarisation prématurée entre le culot et le capotage.Such a cowling is imperfect because the firing gases can infiltrate radially into the cowling at the edge of the cowling and damage the equipment or cause premature separation between the base and the cowling.

Par ailleurs ce capotage est réalisé en un matériau qui se désintègre lors du tir. Or il est essentiel que la destruction du capotage n'intervienne pas trop tôt afin que la protection des équipements soit assurée.Furthermore, this cowling is made of a material which disintegrates during firing. However, it is essential that the destruction of the cowling does not occur too soon so that the protection of the equipment is ensured.

Il y a donc une certaine contradiction que ne lève pas se brevet à vouloir assurer une protection avec un capotage conçu pour être fragile.There is therefore a certain contradiction that the patent does not raise in wanting to provide protection with a cowling designed to be fragile.

On connaît enfin par le brevet FR672990 un projectile qui comporte un capotage recouvrant les flancs et le fond du culot du projectile, capotage qui est poussé par la pression des gaz et qui s'applique contre la douille pour empêcher les gaz de sortir de celle-ci avant la mise à poste du projectile. Une telle solution est limitée à la mise en œuvre dans une munition comportant une douille métallique. Par ailleurs la pression des gaz lors du tir est telle que l'étanchéité de l'intérieur du capotage n'est pas garantie lors d'une expansion de ce capotage.Finally, we know from the patent FR672990 a projectile which comprises a cowling covering the sides and the bottom of the base of the projectile, which cowling is pushed by the pressure of the gases and which is applied against the casing to prevent the gases from leaving the latter before the positioning of the projectile. Such a solution is limited to implementation in ammunition comprising a metal casing. Moreover, the pressure of the gases during firing is such that the leaktightness of the inside of the cowling is not guaranteed during an expansion of this cowling.

L'invention se propose de résoudre ce problème en proposant un capotage qui peut tout à la fois assurer la protection des équipements mais dont l'éjection consécutive au tir est assurée de façon fiable et reproductible.The invention proposes to solve this problem by proposing a cowling which can at the same time ensure the protection of the equipment but whose ejection following the firing is ensured in a reliable and reproducible manner.

Avantageusement, l'invention résout également un problème de maintien en position axiale du capotage.Advantageously, the invention also solves a problem of maintaining the cowling in the axial position.

Avantageusement, l'invention résout également un problème de protection du culot du projectile contre les agressions thermiques et mécaniques de grains de poudre durant le tir.Advantageously, the invention also solves a problem of protecting the base of the projectile against thermal and mechanical attack from grains of powder during firing.

L'invention porte donc sur un capotage destiné à protéger un culot d'un projectile gyrostabilisé qui comporte une ceinture d'étanchéité destinée à correspondre avec les rayures d'une arme, le capotage comportant un fond destiné à être positionné à l'arrière du projectile et un flanc qui s'étend du fond jusqu'à un bord avant destiné à être positionné au voisinage de l'arrière de la ceinture, capotage caractérisé en ce qu'il comporte un renflement annulaire ou virole qui est situé au niveau du bord avant du capotage et qui est dimensionnée de manière à pouvoir être appliquée de façon radialement serrée contre le culot du projectile pour empêcher la pénétration de gaz dans le capotage.The invention therefore relates to a cowling intended to protect a base of a gyrostabilized projectile which comprises a sealing belt intended to correspond with the scratches of a weapon, the cowling comprising a bottom intended to be positioned at the rear of the projectile and a flank which extends from the bottom to a front edge intended to be positioned in the vicinity of the rear of the belt, cowling characterized in that it comprises an annular bulge or ferrule which is located at the level of the edge front of the cowling and which is dimensioned in such a way that it can be applied in a radially tight manner against the base of the projectile to prevent the penetration of gases into the cowling.

Avantageusement, la virole comporte une collerette portée par l'intérieur du bord avant, collerette destinée à coopérer avec une gorge du projectile située juste derrière la ceinture pour empêcher le retrait axial du capotage.Advantageously, the ferrule includes a collar carried by the inside of the front edge, a collar intended to cooperate with a groove of the projectile located just behind the belt to prevent the axial shrinkage of the cowling.

Avantageusement, la virole une fois placée sur le culot a un diamètre extérieur égal à celui de la ceinture.Advantageously, the ferrule once placed on the base has an outside diameter equal to that of the belt.

Avantageusement, la virole comporte un épaulement orienté vers l'arrière du projectile et destiné à correspondre avec un outillage de mise en place.Advantageously, the ferrule has a shoulder oriented towards the rear of the projectile and intended to correspond with an installation tool.

Avantageusement, le capotage comporte au moins deux matériaux différents.Advantageously, the cowling comprises at least two different materials.

En particulier, la virole pourra comporter un matériau élastique polyamide.In particular, the ferrule may comprise an elastic polyamide material.

Le flanc et le fond pourront par ailleurs comporter un matériau élastique silicone.The flank and the bottom may also comprise an elastic silicone material.

Selon une variante de l'invention, le fond du capotage pourra comporter un renfort anti impact.According to a variant of the invention, the bottom of the cowling may include an anti-impact reinforcement.

L'invention porte également sur un projectile gyrostabilisé comportant une ceinture d'étanchéité destinée à correspondre avec les rayures d'une arme et comportant un capotage selon l'une des caractéristiques précédentes.The invention also relates to a gyrostabilized projectile comprising a sealing belt intended to correspond with the scratches of a weapon and comprising a cowling according to one of the preceding characteristics.

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

  • [fig 1] représente une vue en coupe partielle d'un projectile équipé d'un capotage selon l'invention.
  • [fig 2] représente une vue en coupe partielle d'un projectile selon l'invention dans un tube d'arme et durant un tir.
  • [fig 3] représente une vue en coupe partielle d'un capotage selon l'invention lors de sa mise en place sur un projectile.
The invention will be better understood on reading the following description, description given in the light of the appended drawings, drawings in which:
  • [ fig 1 ] shows a partial sectional view of a projectile equipped with a cowling according to the invention.
  • [ fig 2 ] shows a partial sectional view of a projectile according to the invention in a weapon barrel and during firing.
  • [ fig 3 ] shows a partial sectional view of a cowling according to the invention during its installation on a projectile.

Selon la figure 1, un projectile 100 gyrostabilisé comporte une ceinture 200 du type décrit par exemple dans le brevet FR2882430 où la ceinture est dérapante. En fonction de la nature de l'équipement à protéger, une ceinture non dérapante pourra également être utilisée.According to figure 1 , a gyrostabilized projectile 100 comprises a belt 200 of the type described for example in the patent FR2882430 where the belt is slipping. Depending on the nature of the equipment to be protected, a non-slip belt may also be used.

En arrière de cette ceinture se situe le culot 101 du projectile 100. Le culot 101 abrite des ailettes 10 pivotantes, situées dans des logements 21 du culot 101, et appelées à se déplier vers l'extérieur du projectile 100 après la sortie du tube grâce à des moyens non décrits.Behind this belt is the base 101 of the projectile 100. The base 101 houses pivoting fins 10, located in housings 21 of the base 101, and called to unfold towards the outside of the projectile 100 after the exit of the tube thanks to in ways not described.

Un capotage 1 recouvre le culot 101. Le capotage 1 comporte un fond 2 situé en regard avec une face arrière AR du culot 101. Un flanc 3 entoure la surface périphérique du culot 101 et il s'étend du fond 2 jusqu'à un bord avant 4 qui est situé au voisinage de l'arrière de la ceinture 200.A cowling 1 covers the base 101. The cowling 1 comprises a bottom 2 located opposite a rear face AR of the base 101. A sidewall 3 surrounds the peripheral surface of the base 101 and it extends from the bottom 2 to an edge front 4 which is located in the vicinity of the rear of the belt 200.

Le fond 2 et le flanc 3 du capotage 1 recouvrent ainsi tout le culot 101. Le capotage 1 comporte aussi un renflement annulaire 5, nommé par la suite virole 5, qui forme le bord 4 du capotage. Cette virole 5 comporte un matériau élastique qui est dimensionné de manière telle que, lorsque le capotage est en place, la virole serre radialement le culot d'une façon suffisante pour empêcher la pénétration de gaz dans le capotage au niveau du bord avant 4.The bottom 2 and the side 3 of the cowling 1 thus cover the entire base 101. The cowling 1 also comprises an annular bulge 5, hereinafter referred to as shell 5, which forms the edge 4 of the cowling. This shroud 5 comprises an elastic material which is dimensioned in such a way that, when the cowling is in place, the shroud radially tightens the base sufficiently to prevent the penetration of gas into the cowling at the level of the front edge 4.

L'Homme du Métier choisira de préférence pour réaliser la virole 5 un matériau comportant du polyamide pour ses caractéristiques plastiques et de tenue à la chaleur et à la pression.A person skilled in the art will preferably choose to make the shroud 5 a material comprising polyamide for its plastic characteristics and resistance to heat and pressure.

On note que le fond 2 du capotage 1 pourra comporter un renfort 6 comportant une feuille métallique par exemple, renfort pouvant éventuellement s'étendre en partie sur le flanc 3.It is noted that the bottom 2 of the cowling 1 may include a reinforcement 6 comprising a metal sheet for example, reinforcement possibly extending in part on the sidewall 3.

On note également que le capotage 1 comporte une collerette 7 positionnée sur l'intérieur du bord avant 4, collerette 7 qui est destinée à correspondre avec une gorge 102 du projectile 100, gorge qui est située juste derrière la ceinture 200. La collerette 7 verrouille ainsi le capotage 1 sur le projectile 100 et empêche tout retrait du capotage 1 selon l'axe longitudinal X du capotage 1.It is also noted that the cowling 1 comprises a flange 7 positioned on the inside of the front edge 4, flange 7 which is intended to correspond with a groove 102 of the projectile 100, groove which is located just behind the belt 200. The collar 7 thus locks the cowling 1 on the projectile 100 and prevents any withdrawal of the cowling 1 along the longitudinal axis X of the cowling 1.

On remarque que, lorsque le capotage 1 est en place sur le culot 101 comme à la figure 1, le diamètre extérieur D de la virole 5 est sensiblement égal au diamètre extérieur D de la ceinture 200.Note that, when the cowling 1 is in place on the base 101 as in the figure 1 , the outer diameter D of the ferrule 5 is substantially equal to the outer diameter D of the belt 200.

Selon la figure 2, un projectile 100 comportant un capotage 1 selon l'invention est situé dans un tube 300 d'une arme qui comporte des rayures 301 hélicoïdales destinées à imprimer un mouvement de rotation au projectile pour le gyrostabiliser.According to figure 2 , a projectile 100 comprising a cowling 1 according to the invention is located in a tube 300 of a weapon which comprises helical stripes 301 intended to impart a rotational movement to the projectile to gyro-stabilize it.

D'une façon classique, le couplage entre les rayures 301 et le projectile se fait au niveau de la ceinture 200 qui comporte un matériau ductile qui adopte la forme des rayures 301 par déformation.Conventionally, the coupling between the stripes 301 and the projectile takes place at the level of the belt 200 which comprises a ductile material which adopts the shape of the stripes 301 by deformation.

La virole 5 ayant sensiblement le même diamètre externe D que la ceinture 200 est elle aussi déformée par les rayures 301 de l'arme 300 qui forment des créneaux sur toute sa circonférence.The ferrule 5 having substantially the same outer diameter D as the belt 200 is also deformed by the scratches 301 of the weapon 300 which form crenellations over its entire circumference.

Avantageusement, cette déformation induit une pression supplémentaire de la virole 5 sur le bord avant 4 du capotage 1 ce qui contribue à empêcher la pénétration de gaz de tir dans le capotage 1, protégeant ainsi le culot 101 et ses équipements 10.Advantageously, this deformation induces additional pressure of the ferrule 5 on the front edge 4 of the cowling 1 which contributes to preventing the penetration of firing gas into the cowling 1, thus protecting the base 101 and its equipment 10.

Les zones de déformation de la virole 5 par les rayures 301 constituent autant de zones d'accumulation de contraintes mécaniques qui fragilisent la virole 5, facilitant son éjection comme nous allons le voir plus loin.The zones of deformation of the shroud 5 by the scratches 301 constitute as many zones of accumulation of mechanical stresses which weaken the shroud 5, facilitating its ejection as we shall see later.

Durant le tir, des grains de poudre propulsive 500 en combustion peuvent être projetés vigoureusement contre le fond 2 du capotage 1, risquant de perforer celui-ci par effet thermique ou cinétique ce qui pourrait occasionner des voies de pénétration des gaz dans le capotage 1.During firing, grains of propellant powder 500 in combustion can be projected vigorously against the bottom 2 of the cowling 1, risking perforating the latter by effect thermal or kinetic which could lead to gas penetration paths in the cowling 1.

Le renfort 6 cité précédemment agit en bouclier anti-impact évitant la perforation du capotage 1 par les grains 500.The reinforcement 6 mentioned above acts as an anti-impact shield preventing the perforation of the cowling 1 by the 500 grains.

A la sortie de l'arme 300 la force centrifuge appliquée à la virole 5, du fait de la gyrostabilisation et des effets de l'écoulement aérodynamique, et l'absence de maintien par le tube va engendrer un éclatement de la virole 5, qui a été fragilisée par le passage dans le tube, et du bord avant 4 du capotage ce qui provoquera une désolidarisation du capotage 1 par rapport au culot 101, favorable au déploiement des ailettes.At the exit of the weapon 300 the centrifugal force applied to the ferrule 5, due to the gyrostabilization and the effects of the aerodynamic flow, and the absence of support by the tube will cause the ferrule 5 to burst, which has been weakened by the passage in the tube, and the front edge 4 of the cowling which will cause a separation of the cowling 1 with respect to the base 101, favorable to the deployment of the fins.

Le capotage 1 pourra être fait d'un bloc unique d'un matériau comportant du polyamide mais pourra aussi être une pièce comportant plusieurs matériaux solidaires les uns des autres, comme par exemple une virole 5 réalisée en polyamide et solidaire d'un godet en silicone formé par les flancs 3 et le fond 2.The cowling 1 may be made of a single block of a material comprising polyamide but may also be a part comprising several materials integral with each other, such as for example a ferrule 5 made of polyamide and integral with a cup made of silicone. formed by the sides 3 and the bottom 2.

Le silicone est particulièrement avantageux pour sa résistance à la chaleur et à la pression et présente l'avantage de se rompre très facilement lors de la phase de désolidarisation du culot 101 en sortie de tube.Silicone is particularly advantageous for its resistance to heat and pressure and has the advantage of breaking very easily during the phase of separation of the base 101 at the tube outlet.

La fabrication du capotage 1 pourra ainsi être aisément réalisée par injection bi-matières du godet et de la virole. L'injection pourra être réalisée dans un moule incorporant le renfort 6 qui se trouvera emprisonné dans le godet.The manufacture of the cowling 1 can thus be easily carried out by bi-material injection of the cup and the ferrule. The injection can be carried out in a mold incorporating the reinforcement 6 which will be imprisoned in the bucket.

A titre de variante, le renfort pourra être collé sur le godet après fabrication. Le renfort pourra être collé à l'intérieur ou à l'extérieur du godet.Alternatively, the reinforcement may be bonded to the bucket after manufacture. The reinforcement can be glued inside or outside the bucket.

Selon la figure 3, le capotage 1 comporte un diamètre interne légèrement inférieur au diamètre externe du culot 101 afin que la virole 5, une fois mise en place puisse être en tension pour serrer suffisamment le culot 101 pour éviter la pénétration des gaz.According to picture 3 , the cowling 1 has an internal diameter slightly smaller than the external diameter of the base 101 so that the ferrule 5, once in place, can be in voltage to sufficiently tighten the base 101 to prevent the penetration of gases.

Afin de mettre en place le capotage 1, la virole 5 comporte un épaulement 8 orienté vers l'arrière AR qui sert de face d'appui à un outillage 12 qui pousse le capotage 1, selon l'axe longitudinal X, et le long des parois du culot 101 qui sont en partie légèrement coniques ce qui provoque l'expansion progressive de la virole 5, du bord 4 et de la collerette 7.In order to put the cowling 1 in place, the ferrule 5 comprises a shoulder 8 oriented towards the rear AR which serves as a support face for a tool 12 which pushes the cowling 1, along the longitudinal axis X, and along the walls of the base 101 which are partly slightly conical which causes the progressive expansion of the ferrule 5, of the edge 4 and of the collar 7.

L'outillage 12 présente une forme sensiblement tubulaire et a sa paroi externe qui comporte des fentes 13 qui facilitent sa déformation progressive au fur et à mesure de l'expansion de la virole 4 et de l'épaulement 8.The tool 12 has a substantially tubular shape and has its outer wall which includes slots 13 which facilitate its progressive deformation as the ferrule 4 and the shoulder 8 expand.

Claims (9)

  1. A cover (1) intended to protect a base (101) of a spin-stabilized projectile (100) that includes a sealing band (200) intended to correspond with the grooves (301) of a gun (300), the cover (1) including a bottom (2) intended to be positioned at the rear of the projectile (100) and a flank (3) that extends from the bottom (2) to a front edge (4) intended to be positioned in the vicinity of the rear of the band (200), the cover being characterized in that it includes an annular bulge or shell (5) that is located at the front edge (4) of the cover (1) and that is dimensioned so as to be able to be applied radially gripped against the base (101) of the projectile (100) to prevent gas from penetrating the cover (1).
  2. The cover (1) according to claim 1, characterized in that the shell (5) includes a flange (7) carried by the inside of the front edge (4), which flange (7) is intended to cooperate with a groove (102) of the projectile (100) located just behind the band (200) to prevent the axial removal of the cover (1).
  3. The cover (1) according to any one of claims 1 or 2, characterized in that the shell (5), once it is placed on the base (101), has an outer diameter equal to that of the band (200).
  4. The cover (1) according to any one of claims 1 to 3, characterized in that the shell (5) includes a shoulder (8) oriented toward the rear (AR) of the projectile (100) and intended to correspond with a placement tool (12).
  5. The cover (1) according to any one of the preceding claims, characterized in that it includes at least two different materials.
  6. The cover (1) according to claim 5, characterized in that the shell (5) includes an elastic polyamide material.
  7. The cover (1) according to any one of claims 5 or 6, characterized in that the flank and the bottom include an elastic silicone material.
  8. The cover (1) according to any one of claims 1 to 7, characterized in that the bottom (2) of the cover (1) includes an anti-impact reinforcement (6).
  9. A spin-stabilized projectile (100) including a sealing band (200) intended to correspond with the grooves (301) of a gun (300) and including a cover (1) according to any one of claims 1 to 8.
EP20158973.6A 2019-03-27 2020-02-24 Hood and projectile comprising such a hood Active EP3715772B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1903084A FR3094475B1 (en) 2019-03-27 2019-03-27 Cowling and projectile comprising such a cowling

Publications (2)

Publication Number Publication Date
EP3715772A1 EP3715772A1 (en) 2020-09-30
EP3715772B1 true EP3715772B1 (en) 2023-06-07

Family

ID=67262676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20158973.6A Active EP3715772B1 (en) 2019-03-27 2020-02-24 Hood and projectile comprising such a hood

Country Status (2)

Country Link
EP (1) EP3715772B1 (en)
FR (1) FR3094475B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR672990A (en) * 1928-04-26 1930-01-09 Sealing device imperative at the start of scratches in the barrels firing ammunition with casing integral with the projectile
DE4105142A1 (en) * 1991-02-20 1992-08-27 Diehl Gmbh & Co PROJECTILE WITH FOLD-OUT PAD
FR2763392B1 (en) * 1997-05-15 1999-06-11 Giat Ind Sa BOX FOR PROPULSIVE CHARGE
FR2768809B1 (en) * 1997-09-24 1999-10-15 Giat Ind Sa LARGE CALIBER LONG RANGE FIELD ARTILLERY PROJECTILE
US6435097B1 (en) 2001-04-09 2002-08-20 The United States Of America As Represented By The Secretary Of The Army Protective device for deployable fins of artillery projectiles
FR2882430B1 (en) 2005-02-21 2007-03-30 Giat Ind Sa ARTILLERY PROJECTILE COMPRISING A BELT

Also Published As

Publication number Publication date
EP3715772A1 (en) 2020-09-30
FR3094475A1 (en) 2020-10-02
FR3094475B1 (en) 2022-08-12

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