EP0594482A1 - Case for a propellant charge - Google Patents

Case for a propellant charge Download PDF

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Publication number
EP0594482A1
EP0594482A1 EP93402536A EP93402536A EP0594482A1 EP 0594482 A1 EP0594482 A1 EP 0594482A1 EP 93402536 A EP93402536 A EP 93402536A EP 93402536 A EP93402536 A EP 93402536A EP 0594482 A1 EP0594482 A1 EP 0594482A1
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EP
European Patent Office
Prior art keywords
envelope
housing
propellant charge
rupture
housing according
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.)
Granted
Application number
EP93402536A
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German (de)
French (fr)
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EP0594482B1 (en
Inventor
Marc Reuche
Bruno Lang
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.)
Luchaire Defense SA
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Luchaire Defense SA
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Publication of EP0594482A1 publication Critical patent/EP0594482A1/en
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Publication of EP0594482B1 publication Critical patent/EP0594482B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A1/00—Missile propulsion characterised by the use of explosive or combustible propellant charges
    • F41A1/08—Recoilless guns, i.e. guns having propulsion means producing no recoil
    • F41A1/10—Recoilless guns, i.e. guns having propulsion means producing no recoil a counter projectile being used to balance recoil

Definitions

  • the field of the present invention is that of housings intended to contain a propellant charge and to be placed in a weapon tube without recoil.
  • gargousses have the function of ensuring the maintenance as well as the initial confinement of the propellant charge.
  • they include two shoes, adjusted to the internal diameter of the tube, and connected by a rod whose rupture occurs for a well determined value of the pressure.
  • the hooves are then pushed in opposite directions, one carries the projectile and the other a counter-mass.
  • Patent FR2576682 describes such a type of housing.
  • Patent WO92 / 06344 describes a propellant charge box made up of two substantially identical half-boxes which are assembled by a connection means which can be fragmented by the pressure of the gases.
  • Such a housing also has drawbacks.
  • the assembly of the housing is complex to carry out.
  • housing according to the invention is of simple design and nevertheless ensures gas tightness without the addition of complementary seals.
  • the subject of the invention is therefore a housing intended to contain a propellant charge and to be put in place in a tube of a recoilless weapon, housing comprising a cylindrical envelope intended to come to adjust in a sliding manner in the tube of the weapon, and delimited by two side walls, this casing is characterized in that the cylindrical envelope is made in one piece and has at least one annular rupture initiator and in that, after rupture of the latter under the effect of the pressure of the gases generated by the propellant charge, the casing is divided into at least two elements which are free to translate relative to each other, each element carrying an envelope part ensuring gas tightness.
  • An advantage of such an arrangement is that it makes it possible to control the rupture characteristics of the housing which then only depend on the geometry and the choice of the material of the housing.
  • the rupture characteristics of the housing proposed by the invention are therefore not likely to be affected by the quality of an assembly of two half-housings (such as the bonding proposed by patent W092 / 06344), assembly whose resistance risks in addition to vary with time and the storage constraints of the ammunition.
  • Another advantage of such an arrangement is that the casing of the casing is applied by the pressure of the gases against the internal surface of the tube and this before separating into two parts. The level of sealing thus obtained is excellent.
  • the cylindrical casing has two incipient fractures, each of which being arranged in the vicinity of a different side wall.
  • This particular embodiment makes it possible to control the rupture characteristics of the housing at gas pressure, even in the case where the housing has a considerable length. Indeed, each rupture initiator being placed in the vicinity of a different lateral wall, the length of the envelope portion situated between the rupture initiator and the lateral wall can be relatively short, which makes it possible to reduce the friction forces. of the envelope on the barrel of the weapon.
  • the location of the rupture initiators will be chosen so that they delimit on the envelope a front part and a rear part of substantially equal lengths.
  • At least one side wall is constituted by a cover made integral with the envelope by a connecting means.
  • This characteristic makes it possible to easily increase the rigidity of the side wall which must both resist the pressure of the gases and transmit the thrust forces to the projectile or to the counter-mass.
  • the envelope provided with a side wall can thus receive the igniter and the propellant charge, the cover then being placed so as to close the housing.
  • the cover has a peripheral groove in which is housed an internal rim of the envelope, rim and groove ensuring the joining of the envelope and the cover.
  • a side wall is formed in one piece with the envelope. This wall will preferably be that which is intended to be in the vicinity of the counter mass. Such an arrangement further facilitates the mounting of the housing.
  • the cover is formed by a rear part of the projectile.
  • the initiation of rupture can result from a thinning of the cylindrical envelope.
  • the housing includes a cup of compressible foam keen to calibrate the propellant charge.
  • the envelope is made of flexible plastic material with a high coefficient of elongation and a low coefficient of friction.
  • the propellant charge is initiated by an igniter, placed inside the housing and at the axis of the latter, igniter resting in at least one housing arranged in a side wall.
  • This arrangement further facilitates the mounting of the housing and allows an output of the igniter wires through an orifice disposed in the axis of the housing, preferably on the cover.
  • the housing intended to contain a propellant charge and to be put in place in a tube of a recoilless weapon consists of two half-housings each comprising a cylindrical envelope intended to come to adjust sliding way in the barrel of the weapon, envelopes each carrying a side wall, this casing is characterized in that each envelope carries an annular rupture initiator, and in that, after rupture of the latter under the effect of the pressure gases generated by the propellant charge, the housing is divided into at least two elements free to translate relative to each other, each element carrying an envelope portion ensuring gas tightness.
  • This particular embodiment makes it possible to obtain very light housings.
  • a recoilless weapon 1 is shown schematically in half-section.
  • This weapon comprises a cylindrical tube 2 of axis 22, which is produced for example by filament wound. Inside the tube are arranged: a projectile 4, a housing 3 containing a propellant charge and a counter-mass 6.
  • Against the mass 6 is constituted for example by a bundle of plastic filaments intended to separate at their exit from the tube.
  • the projectile carries at its rear part stabilization fins 5. They are folded back inside the tube 2 and deploy when the projectile leaves the latter.
  • the housing 3 comprises a cylindrical envelope 7 which is adjusted sliding in the tube 2.
  • the envelope is closed by two side walls.
  • a first side wall hereinafter called the bottom wall 9, is formed in one piece with the envelope.
  • a second side wall is constituted by a cover 8.
  • the casing and the bottom are made of flexible plastic material with a high coefficient of elongation (of the order of 600% to 900%) and a low coefficient of friction (for example a coefficient of static friction on dry steel of between 0.15 and 0.25).
  • a high coefficient of elongation of the order of 600% to 900%
  • a low coefficient of friction for example a coefficient of static friction on dry steel of between 0.15 and 0.25.
  • the cover is made of aluminum alloy, but could also be made of plastic.
  • the realization of the metal cover ensures good mechanical strength thereof with a simple geometric shape (cylindrical). Mechanical resistance is essential to allow ejection of the projectile without gas leakage.
  • the envelope 7 has an internal rim 17 arranged at its opening. This rim is intended to be housed in a peripheral groove 18 of the cover 8.
  • the housing 3 defines an internal volume 11 intended to receive a propellant charge of known type, for example a powder with single base or double base flakes.
  • a black powder igniter 12 of known type is disposed in the volume 11 and at the level of the axis 22 of the weapon and of the casing. It is adjusted in a first housing 14 arranged on the cover 8 and it is supported in a second housing 15 produced on a cylindrical extension 16 of the bottom 9 of the housing.
  • the igniter is connected by wires (not shown) to a firing device (not shown) which is integral with the weapon.
  • the wires exit from the housing 3 through an orifice 13 arranged in the cover 8.
  • the metal cover 8 allows the igniter to be fixed in a rigid manner, which ensures that it remains well-vibrated.
  • the envelope 7 has at its median part an annular fracture initiator 10 whose profile is triangular. It defines two parts on the cylindrical casing 7: a front part 7a which is close to the cover 8 and a rear part 7b which is close to the bottom 9.
  • the cover 8 is mounted on the casing 7 by elastic deformation of the latter.
  • the cover is positioned at the opening of the casing 7 inside which the propellant charge and the igniter have been placed. It is then applied strongly against the envelope. The elasticity of the envelope ensures the establishment of the rim 17 in the groove 18 preventing any subsequent separation of the cover and the envelope.
  • the pressure is also exerted on the cover 8 and on the bottom wall 9, which has the effect of generating a tensile stress inside the envelope.
  • the envelope 7 is split in two at the level of the initiation of rupture 10.
  • Figure 2 shows the weapon at the time of this separation.
  • the igniter is no longer shown, its constituent elements having been fragmented by pressure.
  • the pressure of the gases pushes the projectile in the direction X via the cover 8 which carries the front part 7a of the envelope 7.
  • the pressure also pushes the counter-mass 6 in the direction Y via the bottom wall 9 secured to the rear part 7b of the casing 7.
  • the gas pressure is exerted radially on the parts 7a and 7b of the envelope and therefore firmly applies the latter against the internal surface of the tube 2.
  • each part of the envelope provides a seal against the propellant gases by preventing the latter from advancing towards the projectile or towards the counter-mass.
  • the front parts 7a and rear 7b Due to the triangular profile of the breaking point 10, the front parts 7a and rear 7b have lips identified 19a and 19b respectively.
  • the gas pressure is exerted on the lips 19a and 19b which further improves the seal obtained.
  • the separation between the front and rear parts of the housing takes place only after the pressure has applied the envelope against the internal surface of the tube.
  • FIG 3 shows a variant of the housing 3 in which a wedging bowl 20, made of polystyrene foam, is disposed in the housing. This bowl is supported on the bottom wall 9 and it is adjusted on the one hand to the internal surface of the casing 7 and on the other hand to the cylindrical extension 16.
  • the bowl 20 has a conical end 23 which bears on a bearing of complementary shape fitted on the cover 8.
  • a foam washer 21 is supported on the one hand on the cover 8 and on the other hand on the bowl 20.
  • Bowl 20 and washer 21 provide propellant loading timing. In addition, they make it possible to delimit a reduced internal volume 11 for setting up the load.
  • the rupture initiator could be arranged on the external surface of the housing.
  • the initiation of rupture can result from a weakening of the envelope, obtained for example by localized heating or else by a sudden variation in section.
  • bottom wall 9 which does not consist of a single piece with the envelope 7.
  • FIG. 4 represents a housing for propellant charge according to a second embodiment
  • the housing 3 comprises a cylindrical envelope 7 closed by two side walls.
  • the bottom wall 9 is formed in one piece with the envelope, and the cover 8 constitutes the second side wall.
  • the casing and the bottom are also made of flexible plastic material with a high coefficient of elongation, for example polyethylene.
  • the cover is made of aluminum alloy.
  • the internal rim 17 of the envelope is housed in the peripheral groove 18 of the cover 8 to ensure the connection of these two elements.
  • the internal volume 11 receives the propellant charge.
  • the igniter 12 with black powder is placed in the volume 11 and at the level of the axis 22 of the weapon and of the case. It is adjusted in a first housing 14 arranged on the cover 8 and it is supported on a stud 24 secured to the bottom 9 of the housing.
  • the casing 7 has two annular rupture initiators 10a, 10b.
  • Each rupture initiator is arranged in the vicinity of a side wall.
  • These incipient fractures define on the cylindrical casing 7 three parts: a front part 7a near the cover 8, a rear part 7b near the bottom 9 and a middle part 7c.
  • the breaking initiators are arranged so that the length L1 of the front part 7a of the envelope is substantially equal to the length L2 of the rear part 7b of the envelope.
  • Figure 5 shows the weapon at the time of this separation.
  • the pressure of the gases pushes the projectile in the direction X via the cover 8 which carries the front part 7a of the envelope 7.
  • the pressure also pushes the counter-mass 6 in the direction Y via the bottom wall 9 secured to the rear part 7b of the casing 7.
  • the middle part 7c of the envelope remains applied to the wall of the tube.
  • This variant makes it possible to limit the values of the lengths L1 and L2 (for example to 5 to 10 mm). This reduces the friction forces between the tube 2 and the front 7a and rear 7b parts of the envelope and avoids the risks of ruptures at locations different from those of the primers of ruptures 10a and 10b.
  • Such an arrangement ensures the reproducibility of the location of envelope ruptures, even in the case where the housing has a significant length (greater than or equal to the diameter).
  • Another advantage of such an embodiment is that it allows, by playing on the values of L1 and L2, to obtain tube / envelope friction forces which are different for the front and rear parts of the latter. It is thus possible to adjust the recoil forces of a given weapon.
  • FIG. 6 shows a box in which the length L2 is twice the length L1.
  • the friction force on the tube 2 of the rear part 7b of the envelope is then twice that of the front part 7a.
  • FIG. 7 shows such a variant.
  • the box 3 consists of two half-boxes 3a and 3b made integral by a thread 25.
  • each half-housing constitutes a side wall 26a, 26b.
  • a propellant charge is placed in a case 28, placed at the axis of the housing, and held by a spacer 27 bearing on the internal surface of the half-housing 3b.
  • Each half-casing carries a cylindrical envelope (71a, 71b) on which a rupture initiator (10a, 10b) is arranged.
  • Each rupture initiator is disposed in the vicinity of a different side wall 26a, 26b.
  • FIG. 9 represents another variant in which the housing according to the invention is closed by a cover 8 which is formed by the rear of the projectile 4.
  • Such an arrangement facilitates mounting of the weapon, the projectile carrying the propellant charge box then constituting a sub-assembly.
  • the aerodynamic forces cause the casing part 7a to be ejected, which therefore does not disturb the trajectory of the projectile.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Medicinal Preparation (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Hydrogenated Pyridines (AREA)
  • Toys (AREA)
  • Fats And Perfumes (AREA)

Abstract

The technical sector of the invention is that of cases intended to contain a propellant charge and to be placed in a recoilless weapon barrel. The case (3) according to the invention includes a cylindrical envelope (7) intended to be aligned by sliding in the barrel (2) of the weapon, and delimited by two side walls (8, 9), it is characterised in that the cylindrical envelope has an annular incipient rupture (10) and in that, after rupture of the latter under the effect of the pressure of the gases generated by the propellant charge, the case is divided into two parts which are free to move with respect to one another, each part carrying an envelope element (7a, 7b) ensuring leaktightness to the gases. Application to antitank weapons.

Description

Le domaine de la présente invention est celui des boîtiers destinés à contenir une charge propulsive et à être mis en place dans un tube d'arme sans recul.The field of the present invention is that of housings intended to contain a propellant charge and to be placed in a weapon tube without recoil.

Ces boîtiers, plus communément dénommés gargousses, ont pour fonction d'assurer le maintien ainsi que le confinement initial de la charge propulsive. Généralement ils comprennent deux sabots, ajustés au diamètre interne du tube, et reliés par une tige dont la rupture intervient pour une valeur bien déterminée de la pression.These boxes, more commonly known as gargousses, have the function of ensuring the maintenance as well as the initial confinement of the propellant charge. Generally they include two shoes, adjusted to the internal diameter of the tube, and connected by a rod whose rupture occurs for a well determined value of the pressure.

Les sabots sont alors poussés suivant des directions opposées, l'un entraîne le projectile et l'autre une contre-masse.The hooves are then pushed in opposite directions, one carries the projectile and the other a counter-mass.

Le brevet FR2576682 décrit un tel type de boîtier.Patent FR2576682 describes such a type of housing.

Avec une telle configuration, des fuites de gaz apparaissent fréquemment entre sabot et tube.With such a configuration, gas leaks frequently appear between shoe and tube.

Il est ainsi indispensable de prévoir des joints d'étanchéité complémentaires, ce qui rend le boîtier plus complexe et coûteux et son montage plus délicat.It is therefore essential to provide additional seals, which makes the housing more complex and expensive and its assembly more delicate.

Le brevet W092/06344 décrit un boîtier de charge propulsive constitué de deux demi-boîtiers sensiblement identiques qui sont assemblés par un moyen de liaison fragmentable par la pression des gaz.Patent WO92 / 06344 describes a propellant charge box made up of two substantially identical half-boxes which are assembled by a connection means which can be fragmented by the pressure of the gases.

Un tel boîtier présente également des inconvénients.Such a housing also has drawbacks.

D'une part il est difficile de maîtriser la reproductibilité de la résistance mécanique des moyens de rupture proposés, qui jouent également le rôle de moyens de liaison (par exemple la fixation des demi-boîtiers par collage).On the one hand, it is difficult to control the reproducibility of the mechanical resistance of the proposed breaking means, which also play the role of connecting means (for example the fixing of the half-housings by gluing).

D'autre part l'assemblage du boîtier est complexe à réaliser.On the other hand, the assembly of the housing is complex to carry out.

C'est le but de l'invention que de proposer un boîtier permettant de pallier de tels inconvénients.It is the object of the invention to provide a housing which overcomes such drawbacks.

Ainsi le boîtier selon l'invention est de conception simple et assure néanmoins l'étanchéité aux gaz sans l'adjonction de joints complémentaires.Thus the housing according to the invention is of simple design and nevertheless ensures gas tightness without the addition of complementary seals.

L'invention a donc pour objet un boîtier destiné à contenir une charge propulsive et à être mis en place dans un tube d'une arme sans recul, boîtier comportant une enveloppe cylindrique destinée à venir s'ajuster de façon glissante dans le tube de l'arme, et délimitée par deux parois latérales, ce boîtier est caractérisé en ce que l'enveloppe cylindrique est réalisée d'une seule pièce et présente au moins une amorce de rupture annulaire et en ce que, après rupture de cette dernière sous l'effet de la pression des gaz engendrés par la charge propulsive, le boîtier se trouve partagé en au moins deux éléments libres de se translater l'un par rapport à l'autre, chaque élément portant une partie d'enveloppe assurant une étanchéité aux gaz.The subject of the invention is therefore a housing intended to contain a propellant charge and to be put in place in a tube of a recoilless weapon, housing comprising a cylindrical envelope intended to come to adjust in a sliding manner in the tube of the weapon, and delimited by two side walls, this casing is characterized in that the cylindrical envelope is made in one piece and has at least one annular rupture initiator and in that, after rupture of the latter under the effect of the pressure of the gases generated by the propellant charge, the casing is divided into at least two elements which are free to translate relative to each other, each element carrying an envelope part ensuring gas tightness.

Un avantage d'une telle disposition est qu'elle permet de maîtriser les caractéristiques de rupture du boîtier qui ne dépendent plus alors que de la géométrie et du choix du matériau du boîtier.An advantage of such an arrangement is that it makes it possible to control the rupture characteristics of the housing which then only depend on the geometry and the choice of the material of the housing.

Les caractéristiques de rupture du boîtier proposé par l'invention ne sont donc pas susceptibles d'être affectées par la qualité d'un assemblage de deux demi-boîtiers (tel le collage proposé par le brevet W092/06344), assemblage dont la résistance risque en outre de varier avec le temps et les contraintes de stockage de la munition.The rupture characteristics of the housing proposed by the invention are therefore not likely to be affected by the quality of an assembly of two half-housings (such as the bonding proposed by patent W092 / 06344), assembly whose resistance risks in addition to vary with time and the storage constraints of the ammunition.

Un autre avantage d'une telle disposition est que l'enveloppe du boîtier se trouve appliquée par la pression des gaz contre la surface interne du tube et cela avant de se séparer en deux parties. Le niveau d'étanchéité obtenu ainsi est excellent.Another advantage of such an arrangement is that the casing of the casing is applied by the pressure of the gases against the internal surface of the tube and this before separating into two parts. The level of sealing thus obtained is excellent.

Selon un mode de réalisation préféré de l'invention, l'enveloppe cylindrique présente deux amorces de rupture, chacune d'elle étant disposée au voisinage d'une paroi latérale différente.According to a preferred embodiment of the invention, the cylindrical casing has two incipient fractures, each of which being arranged in the vicinity of a different side wall.

Ce mode particulier de réalisation permet de maîtriser les caractéristiques de rupture du boîtier à la pression des gaz, même dans le cas où le boîtier présente une longueur importante. En effet chaque amorce de rupture étant placée au voisinage d'une paroi latérale différente, la longueur de la portion d'enveloppe située entre l'amorce de rupture et la paroi latérale peut être relativement courte, ce qui permet de réduire les efforts de frottements de l'enveloppe sur le tube de l'arme.This particular embodiment makes it possible to control the rupture characteristics of the housing at gas pressure, even in the case where the housing has a considerable length. Indeed, each rupture initiator being placed in the vicinity of a different lateral wall, the length of the envelope portion situated between the rupture initiator and the lateral wall can be relatively short, which makes it possible to reduce the friction forces. of the envelope on the barrel of the weapon.

On choisira avantageusement l'emplacement des amorces de rupture de telle sorte qu'elles délimitent sur l'enveloppe une partie avant et une partie arrière de longueurs sensiblement égales.Advantageously, the location of the rupture initiators will be chosen so that they delimit on the envelope a front part and a rear part of substantially equal lengths.

Selon une autre caractéristique importante de l'invention, au moins une paroi latérale est constituée par un couvercle rendu solidaire de l'enveloppe par un moyen de liaison.According to another important characteristic of the invention, at least one side wall is constituted by a cover made integral with the envelope by a connecting means.

Cette caractéristique permet d'accroître aisément la rigidité de la paroi latérale qui doit à la fois résister à la pression des gaz et transmettre les efforts de poussée au projectile ou à la contre-masse.This characteristic makes it possible to easily increase the rigidity of the side wall which must both resist the pressure of the gases and transmit the thrust forces to the projectile or to the counter-mass.

Elle permet également un montage et un chargement facile du boîtier. L'enveloppe munie d'une paroi latérale peut ainsi recevoir l'allumeur et la charge propulsive, le couvercle étant mis ensuite en place de façon à fermer le boîtier.It also allows easy mounting and loading of the housing. The envelope provided with a side wall can thus receive the igniter and the propellant charge, the cover then being placed so as to close the housing.

Selon un mode particulier de réalisation, le couvercle présente une gorge périphérique dans laquelle vient se loger un rebord interne de l'enveloppe, rebord et gorge assurant la solidarisation de l'enveloppe et du couvercle.According to a particular embodiment, the cover has a peripheral groove in which is housed an internal rim of the envelope, rim and groove ensuring the joining of the envelope and the cover.

Selon une variante de réalisation, une paroi latérale est formée d'une seule pièce avec l'enveloppe. Cette paroi sera de préférence celle qui est destinée à être au voisinage de la contre masse. Une telle disposition facilite encore le montage du boîtier.According to an alternative embodiment, a side wall is formed in one piece with the envelope. This wall will preferably be that which is intended to be in the vicinity of the counter mass. Such an arrangement further facilitates the mounting of the housing.

Selon une variante de réalisation, le couvercle est formé par une partie arrière du projectile.According to an alternative embodiment, the cover is formed by a rear part of the projectile.

Selon un mode particulier d'exécution, l'amorce de rupture peut résulter d'un amincissement de l'enveloppe cylindrique.According to a particular embodiment, the initiation of rupture can result from a thinning of the cylindrical envelope.

Selon une variante de réalisation, le boîtier comporte une cuvette en mousse compressible destinée à réaliser un calage de la charge propulsive.According to an alternative embodiment, the housing includes a cup of compressible foam keen to calibrate the propellant charge.

De façon préférée, l'enveloppe est réalisée en matière plastique souple à fort coefficient d'allongement et faible coefficient de frottement.Preferably, the envelope is made of flexible plastic material with a high coefficient of elongation and a low coefficient of friction.

Avantageusement, la charge propulsive est initiée par un allumeur, disposé à l'intérieur du boîtier et au niveau de l'axe de celui-ci, allumeur prenant appui dans au moins un logement aménagé dans une paroi latérale.Advantageously, the propellant charge is initiated by an igniter, placed inside the housing and at the axis of the latter, igniter resting in at least one housing arranged in a side wall.

Cette disposition facilite encore le montage du boîtier et permet une sortie des fils de l'allumeur par un orifice disposé dans l'axe du boîtier, de préférence sur le couvercle.This arrangement further facilitates the mounting of the housing and allows an output of the igniter wires through an orifice disposed in the axis of the housing, preferably on the cover.

Selon un autre mode de réalisation, le boîtier destiné à contenir une charge propulsive et à être mis en place dans un tube d'une arme sans recul, est constitué de deux demi-boîtiers comportant chacun une enveloppe cylindrique destinée à venir s'ajuster de façon glissante dans le tube de l'arme, enveloppes portant chacune une paroi latérale, ce boîtier est caractérisé en ce que chaque enveloppe porte une amorce de rupture annulaire, et en ce que, après rupture de ces dernières sous l'effet de la pression des gaz engendrés par la charge propulsive, le boîtier se trouve partagé en au moins deux éléments libres de se translater l'un par rapport à l'autre, chaque élément portant une partie d'enveloppe assurant une étanchéité aux gaz.According to another embodiment, the housing intended to contain a propellant charge and to be put in place in a tube of a recoilless weapon, consists of two half-housings each comprising a cylindrical envelope intended to come to adjust sliding way in the barrel of the weapon, envelopes each carrying a side wall, this casing is characterized in that each envelope carries an annular rupture initiator, and in that, after rupture of the latter under the effect of the pressure gases generated by the propellant charge, the housing is divided into at least two elements free to translate relative to each other, each element carrying an envelope portion ensuring gas tightness.

Ce mode particulier de réalisation permet d'obtenir des boîtiers très légers.This particular embodiment makes it possible to obtain very light housings.

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

  • - la figure 1 est une demi-coupe partielle schématique d'une arme sans recul comportant un boîtier selon l'invention,
  • - la figure 2 est une vue analogue de la précédente qui montre le boîtier après mise à feu de la charge propulsive,
  • - la figure 3 est une demi-coupe partielle schématique d'une arme sans recul comportant une variante de réalisation du boîtier selon l'invention.
  • - la figure 4 représente un deuxième mode de réalisation d'un boîtier selon l'invention,
  • - la figure 5 est une vue analogue de la précédente qui montre le boîtier après mise à feu de la charge propulsive.
  • - la figure 6 représente une variante de ce deuxième mode de réalisation.
  • - la figure 7 représente un troisième mode de réalisation d'un boîtier selon l'invention,
  • - la figure 8 est une vue analogue de la précédente qui montre le boîtier après mise à feu de la charge propulsive,
  • - la figure 9 représente une variante de réalisation d'un boîtier selon l'invention.
The invention will be better understood on reading the description of particular embodiments, description made with reference to the accompanying drawings and in which:
  • FIG. 1 is a schematic partial half-section of a recoilless weapon comprising a housing according to the invention,
  • FIG. 2 is a view similar to the previous one which shows the casing after firing of the propellant charge,
  • - Figure 3 is a partial schematic half-section of a recoilless weapon comprising an alternative embodiment of the housing according to the invention.
  • FIG. 4 represents a second embodiment of a housing according to the invention,
  • - Figure 5 is a similar view of the previous one which shows the housing after firing of the propellant charge.
  • - Figure 6 shows a variant of this second embodiment.
  • FIG. 7 represents a third embodiment of a housing according to the invention,
  • FIG. 8 is a view similar to the previous one which shows the casing after firing of the propellant charge,
  • - Figure 9 shows an alternative embodiment of a housing according to the invention.

En se reportant à la figure 1, la partie médiane d'une arme sans recul 1 est représentée schématiquement en demi-coupe. Cette arme comprend un tube 2 cylindrique d'axe 22, qui est réalisé par exemple en enroulé filamentaire. A l'intérieur du tube sont disposés: un projectile 4, un boîtier 3 contenant une charge propulsive et une contre-masse 6.Referring to Figure 1, the middle part of a recoilless weapon 1 is shown schematically in half-section. This weapon comprises a cylindrical tube 2 of axis 22, which is produced for example by filament wound. Inside the tube are arranged: a projectile 4, a housing 3 containing a propellant charge and a counter-mass 6.

Ces éléments présentent tous globalement une symétrie de révolution autour de l'axe 22.These elements all generally have a symmetry of revolution around the axis 22.

La contre masse 6 est constituée par exemple par un fagot de filaments en matière plastique destinés à se séparer à leur sortie du tube.Against the mass 6 is constituted for example by a bundle of plastic filaments intended to separate at their exit from the tube.

Le projectile porte à sa partie arrière des ailettes de stabilisation 5. Elles sont repliées à l'intérieur du tube 2 et se déploient quand le projectile sort de ce dernier.The projectile carries at its rear part stabilization fins 5. They are folded back inside the tube 2 and deploy when the projectile leaves the latter.

Le boîtier 3 comprend une enveloppe cylindrique 7 qui est ajustée glissante dans le tube 2. L'enveloppe est fermée par deux parois latérales.The housing 3 comprises a cylindrical envelope 7 which is adjusted sliding in the tube 2. The envelope is closed by two side walls.

Une première paroi latérale, appelée par la suite paroi de fond 9, est formée d'une seule pièce avec l'enveloppe.A first side wall, hereinafter called the bottom wall 9, is formed in one piece with the envelope.

Une deuxième paroi latérale est constituée parun couvercle 8.A second side wall is constituted by a cover 8.

L'enveloppe et le fond sont réalisés en matière plastique souple à fort coefficient d'allongement (de l'ordre de 600% à 900%) et faible coefficient de frottement (par exemple un coefficient de frottement statique sur acier à sec compris entre 0.15 et 0.25). On pourra par exemple réaliser l'enveloppe en polyéthylène.The casing and the bottom are made of flexible plastic material with a high coefficient of elongation (of the order of 600% to 900%) and a low coefficient of friction (for example a coefficient of static friction on dry steel of between 0.15 and 0.25). We could for example make the polyethylene envelope.

Le couvercle est réalisé en alliage d'aluminium, mais pourrait également être en matière plastique.The cover is made of aluminum alloy, but could also be made of plastic.

La réalisation du couvercle en métal permet d'assurer une bonne tenue mécanique de celui-ci avec une forme géométrique simple (cylindrique). La tenue mécanique est essentielle pour permettre l'éjection du projectile sans fuite de gaz.The realization of the metal cover ensures good mechanical strength thereof with a simple geometric shape (cylindrical). Mechanical resistance is essential to allow ejection of the projectile without gas leakage.

L'enveloppe 7 comporte un rebord interne 17 aménagé au niveau de son ouverture. Ce rebord est destiné à venir se loger dans une gorge périphérique 18 du couvercle 8. Le boîtier 3 délimite un volume interne 11 destiné à recevoir une charge propulsive de type connu par exemple une poudre en paillettes simple base ou double base.The envelope 7 has an internal rim 17 arranged at its opening. This rim is intended to be housed in a peripheral groove 18 of the cover 8. The housing 3 defines an internal volume 11 intended to receive a propellant charge of known type, for example a powder with single base or double base flakes.

Un allumeur 12 à poudre noire de type connu est disposé dans le volume 11 et au niveau de l'axe 22 de l'arme et du boîtier. Il est ajusté dans un premier logement 14 aménagé sur le couvercle 8 et il prend appui dans un deuxième logement 15 réalisé sur un prolongement cylindrique 16 du fond 9 du boîtier.A black powder igniter 12 of known type is disposed in the volume 11 and at the level of the axis 22 of the weapon and of the casing. It is adjusted in a first housing 14 arranged on the cover 8 and it is supported in a second housing 15 produced on a cylindrical extension 16 of the bottom 9 of the housing.

L'allumeur est relié par des fils (non représentés) à un dispositif de mise à feu (non représenté) qui est solidaire de l'arme. Les fils sortent du boîtier 3 au travers d'un orifice 13 aménagé dans le couvercle 8.The igniter is connected by wires (not shown) to a firing device (not shown) which is integral with the weapon. The wires exit from the housing 3 through an orifice 13 arranged in the cover 8.

Le couvercle métallique 8 permet la fixation de l'allumeur d'une façon rigide ce qui assure la bonne tenue de celui-ci aux vibrations.The metal cover 8 allows the igniter to be fixed in a rigid manner, which ensures that it remains well-vibrated.

L'enveloppe 7 présente au niveau de sa partie médiane une amorce de rupture annulaire 10 dont le profil est triangulaire. Elle délimite sur l'enveloppe cylindrique 7 deux parties : une partie avant 7a qui est voisine du couvercle 8 et une partie arrière 7b qui est voisine du fond 9.The envelope 7 has at its median part an annular fracture initiator 10 whose profile is triangular. It defines two parts on the cylindrical casing 7: a front part 7a which is close to the cover 8 and a rear part 7b which is close to the bottom 9.

Le montage du couvercle 8 sur l'enveloppe 7 s'effectue par déformation élastique de cette dernière.The cover 8 is mounted on the casing 7 by elastic deformation of the latter.

Le couvercle est positionné au niveau de l'ouverture de l'enveloppe 7 à l'intérieur de laquelle a été placée la charge propulsive et l'allumeur. Il est ensuite appliqué fortement contre l'enveloppe. L'élasticité de l'enveloppe assure la mise en place du rebord 17 dans la gorge 18 interdisant toute séparation ultérieure du couvercle et de l'enveloppe.The cover is positioned at the opening of the casing 7 inside which the propellant charge and the igniter have been placed. It is then applied strongly against the envelope. The elasticity of the envelope ensures the establishment of the rim 17 in the groove 18 preventing any subsequent separation of the cover and the envelope.

Le fonctionnement du boîtier selon l'invention est le suivant:

  • Lorsque l'allumeur 12 est mis à feu, il initie à son tour la charge propulsive qui remplit le volume interne 11. La pression s'accroit à l'intérieur du boîtier et elle a pour effet d'appliquer fortement l'enveloppe 7 contre la surface interne du tube.
The operation of the housing according to the invention is as follows:
  • When the igniter 12 is ignited, it in turn initiates the propellant charge which fills the internal volume 11. The pressure builds up inside the housing and it has the effect of strongly applying the envelope 7 against the inner surface of the tube.

La pression s'exerce également sur le couvercle 8 et sur la paroi de fond 9, ce qui a pour effet d'engendrer une contrainte de traction à l'intérieur de l'enveloppe.The pressure is also exerted on the cover 8 and on the bottom wall 9, which has the effect of generating a tensile stress inside the envelope.

Lorsque cette contrainte atteint la limite de résistance du boîtier, l'enveloppe 7 se partage en deux au niveau de l'amorce de rupture 10.When this constraint reaches the resistance limit of the housing, the envelope 7 is split in two at the level of the initiation of rupture 10.

La figure 2 montre l'arme au moment de cette séparation.Figure 2 shows the weapon at the time of this separation.

L'allumeur n'est plus représenté, ses éléments constitutifs ayant été fragmentés par la pression.The igniter is no longer shown, its constituent elements having been fragmented by pressure.

La pression des gaz pousse le projectile dans la direction X par l'intermédiaire du couvercle 8 qui porte la partie avant 7a de l'enveloppe 7.The pressure of the gases pushes the projectile in the direction X via the cover 8 which carries the front part 7a of the envelope 7.

La pression pousse également la contre-masse 6 dans la direction Y par l'intermédiaire de la paroi de fond 9 solidaire de la partie arrière 7b de l'enveloppe 7.The pressure also pushes the counter-mass 6 in the direction Y via the bottom wall 9 secured to the rear part 7b of the casing 7.

La pression des gaz s'exerce radialement sur les parties 7a et 7b de l'enveloppe et applique donc fermement ces dernières contre la surface interne du tube 2.The gas pressure is exerted radially on the parts 7a and 7b of the envelope and therefore firmly applies the latter against the internal surface of the tube 2.

Ainsi après la séparation du boîtier 3, chaque partie de l'enveloppe assure une étanchéité aux gaz propulsifs en empêchant ces derniers de progresser vers le projectile ou vers la contre-masse.Thus after the separation of the housing 3, each part of the envelope provides a seal against the propellant gases by preventing the latter from advancing towards the projectile or towards the counter-mass.

Du fait du profil triangulaire de l'amorce de rupture 10, les parties avant 7a et arrière 7b présentent des lèvres repérées 19a et 19b respectivement. La pression des gaz s'exerce sur les lèvres 19a et 19b ce qui améliore encore l'étanchéité obtenue.Due to the triangular profile of the breaking point 10, the front parts 7a and rear 7b have lips identified 19a and 19b respectively. The gas pressure is exerted on the lips 19a and 19b which further improves the seal obtained.

Avec les boîtiers selon l'état de la technique, la pression des gaz s'exerce entre tube et boîtier dès l'allumage de la charge propulsive et bien avant qu'il n'y ait séparation entre les deux parties du boîtier.With the boxes according to the prior art, the gas pressure is exerted between the tube and the box as soon as the propellant charge is ignited and well before there is separation between the two parts of the box.

Avec l'invention, la séparation entre les parties avant et arrière du boîtier n'intervient qu'après que la pression ait appliqué l'enveloppe contre la surface interne du tube.With the invention, the separation between the front and rear parts of the housing takes place only after the pressure has applied the envelope against the internal surface of the tube.

Le niveau d'étanchéité obtenu ainsi avec le boîtier selon l'invention est supérieur à celui obtenu avec les boîtiers selon l'état de la technique. Il n'est donc plus nécessaire de prévoir de joints d'étanchéité complémentaires.The level of tightness thus obtained with the housing according to the invention is higher than that obtained with the housings according to the prior art. It is therefore no longer necessary to provide additional seals.

La figure 3 représente une variante du boîtier 3 dans laquelle une cuvette de calage 20, réalisée en mousse de polystyrène, est disposée dans le boîtier. Cette cuvette prend appui sur la paroi de fond 9 et elle est ajustée d'une part sur la surface interne de l'enveloppe 7 et d'autre part sur le prolongement cylindrique 16.Figure 3 shows a variant of the housing 3 in which a wedging bowl 20, made of polystyrene foam, is disposed in the housing. This bowl is supported on the bottom wall 9 and it is adjusted on the one hand to the internal surface of the casing 7 and on the other hand to the cylindrical extension 16.

La cuvette 20 présente une extrémité conique 23 qui vient en appui sur une portée de forme complémentaire aménagée sur le couvercle 8.The bowl 20 has a conical end 23 which bears on a bearing of complementary shape fitted on the cover 8.

Une rondelle 21 en mousse est en appui d'une part sur le couvercle 8 et d'autre part sur la cuvette 20.A foam washer 21 is supported on the one hand on the cover 8 and on the other hand on the bowl 20.

Cuvette 20 et rondelle 21 assurent un calage du chargement propulsif. De plus elles permettent de délimiter un volume interne 11 réduit pour mettre en place la charge.Bowl 20 and washer 21 provide propellant loading timing. In addition, they make it possible to delimit a reduced internal volume 11 for setting up the load.

Ce volume s'accroit néanmoins lors de l'augmentation de la pression des gaz. On peut ainsi, avec un encombrement de boîtier donné, faire varier les performances balistiques du chargement propulsif.This volume nevertheless increases with increasing gas pressure. It is thus possible, with a given box size, to vary the ballistic performance of the propellant charge.

A titre de variante il est possible de placer tout le chargement propulsif dans un étui qui contiendra également l'allumeur. L'étui prendra appui d'une part sur le couvercle 8 et d'autre part sur le fond 9 et aura sensiblement la même forme que l'allumeur représenté figure 1. Une telle disposition permet de limiter la valeur de la pression maximale lors de l'allumage de la charge.As a variant, it is possible to place all of the propellant charge in a case which will also contain the igniter. The case will bear on the one hand on the cover 8 and on the other hand on the bottom 9 and will have substantially the same shape as the igniter shown in FIG. 1. Such an arrangement makes it possible to limit the value of the maximum pressure during the ignition of the load.

D'autres variantes sont possibles sans sortir du cadre de l'invention.Other variants are possible without departing from the scope of the invention.

Ainsi il est possible de donner d'autres profils à l'amorce de rupture 10.Thus it is possible to give other profiles to the rupture initiator 10.

L'amorce de rupture pourrait être aménagée sur la surface externe du boîtier.The rupture initiator could be arranged on the external surface of the housing.

L'amorce de rupture peut résulter d'une fragilisation de l'enveloppe, obtenue par exemple par échauffement localisé ou encore par une variation brutale de section.The initiation of rupture can result from a weakening of the envelope, obtained for example by localized heating or else by a sudden variation in section.

Il est possible de réaliser une paroi de fond 9 qui ne soit pas constituée d'une seule pièce avec l'enveloppe 7. Par exemple une paroi de fond analogue au couvercle 8.It is possible to produce a bottom wall 9 which does not consist of a single piece with the envelope 7. For example a bottom wall similar to the cover 8.

Il est possible enfin de solidariser l'enveloppe 7 et le couvercle 8 par d'autres moyens de liaison que le clipsage d'un rebord dans une gorge, par exemple au moyen d'un filetage ou encore par collage.It is finally possible to secure the casing 7 and the cover 8 by other connecting means than the clipping of a flange in a groove, for example by means of a thread or by gluing.

La figure 4 représente un boîtier pour charge propulsive selon un deuxième mode de réalisationFIG. 4 represents a housing for propellant charge according to a second embodiment

Comme dans le mode de réalisation précédent, le boîtier 3 comporte une enveloppe cylindrique 7 fermée par deux parois latérales.As in the previous embodiment, the housing 3 comprises a cylindrical envelope 7 closed by two side walls.

La paroi de fond 9 est formée d'une seule pièce avec l'enveloppe, et le couvercle 8 constitue la deuxième paroi latérale.The bottom wall 9 is formed in one piece with the envelope, and the cover 8 constitutes the second side wall.

L'enveloppe et le fond sont encore réalisés en matière plastique souple à fort coefficient d'allongement par exemple en polyéthylène. Le couvercle est réalisé en alliage d'aluminium.The casing and the bottom are also made of flexible plastic material with a high coefficient of elongation, for example polyethylene. The cover is made of aluminum alloy.

Le rebord interne 17 de l'enveloppe se loge dans la gorge périphérique 18 du couvercle 8 pour assurer la liaison de ces deux éléments. Le volume interne 11 reçoit la charge propulsive.The internal rim 17 of the envelope is housed in the peripheral groove 18 of the cover 8 to ensure the connection of these two elements. The internal volume 11 receives the propellant charge.

L'allumeur 12 à poudre noire est disposé dans le volume 11 et au niveau de l'axe 22 de l'arme et du boîtier. Il est ajusté dans un premier logement 14 aménagé sur le couvercle 8 et il prend appui sur un téton 24 solidaire du fond 9 du boîtier.The igniter 12 with black powder is placed in the volume 11 and at the level of the axis 22 of the weapon and of the case. It is adjusted in a first housing 14 arranged on the cover 8 and it is supported on a stud 24 secured to the bottom 9 of the housing.

Dans ce mode particulier de réalisation, l'enveloppe 7 présente deux amorces de rupture annulaires 10a,10b.In this particular embodiment, the casing 7 has two annular rupture initiators 10a, 10b.

Chaque amorce de rupture est disposée au voisinage d'une paroi latérale. Ces amorces de rupture délimitent sur l'enveloppe cylindrique 7 trois parties : une partie avant 7a voisine du couvercle 8, une partie arrière 7b voisine du fond 9 et une partie médiane 7c.Each rupture initiator is arranged in the vicinity of a side wall. These incipient fractures define on the cylindrical casing 7 three parts: a front part 7a near the cover 8, a rear part 7b near the bottom 9 and a middle part 7c.

Les amorces de rupture sont disposées de telle sorte que la longueur L1 de la partie avant 7a de l'enveloppe soit sensiblement égale à la longueur L2 de la partie arrière 7b de l'enveloppe.The breaking initiators are arranged so that the length L1 of the front part 7a of the envelope is substantially equal to the length L2 of the rear part 7b of the envelope.

Lors de la mise à feu de la charge propulsive, l'augmentation de pression à l'intérieur du boîtier a pour effet d'appliquer fortement l'enveloppe 7 contre la surface interne du tube. Les contraintes de traction qui apparaissent à l'intérieur de l'enveloppe entrai- nent la rupture de cette dernière au niveau des deux amorces de rupture 10a et 10b.When igniting the propellant charge, the increase in pressure inside the casing has the effect of strongly applying the casing 7 against the internal surface of the tube. The tensile stresses which appear inside the envelope cause the latter to rupture at the level of the two rupture initiators 10a and 10b.

La figure 5 montre l'arme au moment de cette séparation.Figure 5 shows the weapon at the time of this separation.

La pression des gaz pousse le projectile dans la direction X par l'intermédiaire du couvercle 8 qui porte la partie avant 7a de l'enveloppe 7.The pressure of the gases pushes the projectile in the direction X via the cover 8 which carries the front part 7a of the envelope 7.

La pression pousse également la contre-masse 6 dans la direction Y par l'intermédiaire de la paroi de fond 9 solidaire de la partie arrière 7b de l'enveloppe 7.The pressure also pushes the counter-mass 6 in the direction Y via the bottom wall 9 secured to the rear part 7b of the casing 7.

La partie médiane 7c de l'enveloppe reste appliquée sur la paroi du tube.The middle part 7c of the envelope remains applied to the wall of the tube.

Cette variante permet de limiter les valeurs des longueurs L1 et L2 (par exemple à 5 à 10 mm). On diminue ainsi les efforts de frottements entre le tube 2 et les parties avant 7a et arrière 7b de l'enveloppe et on évite les risques de ruptures à des emplacements différents de ceux des amorces de ruptures 10a et 10b.This variant makes it possible to limit the values of the lengths L1 and L2 (for example to 5 to 10 mm). This reduces the friction forces between the tube 2 and the front 7a and rear 7b parts of the envelope and avoids the risks of ruptures at locations different from those of the primers of ruptures 10a and 10b.

Une telle disposition permet d'assurer la reproductibilité de la localisation des ruptures d'enveloppe, même dans le cas où le boîtier a une longueur importante (supérieure ou égale au diamètre).Such an arrangement ensures the reproducibility of the location of envelope ruptures, even in the case where the housing has a significant length (greater than or equal to the diameter).

Un autre avantage d'un tel mode de réalisation est qu'il permet, en jouant sur les valeurs de L1 et de L2, d'obtenir des efforts de frottements tube/enveloppe qui soient différents pour les parties avant et arrière de cette dernière. Il est possible ainsi de régler les efforts de recul d'une arme donnée.Another advantage of such an embodiment is that it allows, by playing on the values of L1 and L2, to obtain tube / envelope friction forces which are different for the front and rear parts of the latter. It is thus possible to adjust the recoil forces of a given weapon.

A titre d'exemple la figure 6 montre un boîtier dans lequel la longueur L2 est double de la longueur L1. L'effort de frottement sur le tube 2 de la partie arrière 7b de l'enveloppe est alors le double de celui de la partie avant 7a.By way of example, FIG. 6 shows a box in which the length L2 is twice the length L1. The friction force on the tube 2 of the rear part 7b of the envelope is then twice that of the front part 7a.

Cette différence permet ici de compenser les frottements parasites dûs à la nature du projectile et de permettre d'annuler les efforts de recul.This difference here makes it possible to compensate for the parasitic friction due to the nature of the projectile and to make it possible to cancel the forces of recoil.

La détermination pratique des longueurs L1 et L2 s'effectuera au cas par cas en fonction des caractéristiques de l'arme à définir.The practical determination of the lengths L1 and L2 will be made on a case-by-case basis depending on the characteristics of the weapon to be defined.

Il est possible sans sortir du cadre de l'invention de prévoir diverses variantes reprenant les moyens essentiels de l'invention.It is possible without departing from the scope of the invention to provide various variants incorporating the essential means of the invention.

Il est ainsi possible d'équiper de deux amorces de rupture l'enveloppe cylindrique d'un boitierdu type de celui décrit par le brevet W092/06344.It is thus possible to equip with two rupture initiators the cylindrical envelope of a case of the type of that described by patent WO92 / 06344.

La figure 7 représente une telle variante. Le boîtier 3 est constitué de deux demi-boîtiers 3a et 3b rendus solidaires par un filetage 25.Figure 7 shows such a variant. The box 3 consists of two half-boxes 3a and 3b made integral by a thread 25.

Le fond de chaque demi-boîtier constitue une paroi latérale 26a, 26b.The bottom of each half-housing constitutes a side wall 26a, 26b.

Une charge propulsive est disposée dans un étui 28, placé au niveau de l'axe du boîtier, et maintenu par une entretoise 27 prenant appui sur la surface interne du demi-boîtier 3b.A propellant charge is placed in a case 28, placed at the axis of the housing, and held by a spacer 27 bearing on the internal surface of the half-housing 3b.

Chaque demi-boîtier porte une enveloppe cylindrique (71a, 71 b) sur laquelle est aménagée une amorce de rupture (10a, 10b). Chaque amorce de rupture est disposée au voisinage d'une paroi latérale 26a, 26b différente.Each half-casing carries a cylindrical envelope (71a, 71b) on which a rupture initiator (10a, 10b) is arranged. Each rupture initiator is disposed in the vicinity of a different side wall 26a, 26b.

Ces amorces de rupture sont obtenues par amincissement de l'enveloppe considérée.These fracture primers are obtained by thinning the envelope in question.

Comme dans les exemples précédents, une telle disposition permet de maîtriser la reproductibilité des efforts de rupture de l'enveloppe sous l'effet de la pression des gaz. La liaison entre chaque demi-boîtier peut être alors réalisée de façon rigide.As in the previous examples, such an arrangement makes it possible to control the reproducibility of the rupture forces of the envelope under the effect of the pressure of the gases. The connection between each half-housing can then be made rigidly.

Après la mise à feu de la charge propulsive, le boîtier se trouve partagé en trois éléments (voirfigure 8):

  • - un élément avant constitué de la paroi latérale 26a et d'une partie d'enveloppe 7a et qui pousse le projectile dans la direction X,
  • - un élément arrière constitué de la paroi latérale 26b et d'une partie d'enveloppe 7b et qui pousse la contre-masse dans la direction Y,
  • - un élément médian 29 qui reste appliqué sur la paroi du tube et qui est formé des restes d'enveloppe de chaque demi-boîtier liés par le filetage 25.
After firing the propellant charge, the box is divided into three elements (see Figure 8):
  • a front element consisting of the side wall 26a and of an envelope part 7a and which pushes the projectile in the direction X,
  • a rear element consisting of the side wall 26b and of an envelope part 7b and which pushes the counter-mass in the direction Y,
  • a middle element 29 which remains applied to the wall of the tube and which is formed from the remains of the envelope of each half-housing linked by the thread 25.

La figure 9 représente une autre variante dans laquelle le boîtier selon l'invention est fermé par un couvercle 8 qui est formé par l'arrière du projectile 4.FIG. 9 represents another variant in which the housing according to the invention is closed by a cover 8 which is formed by the rear of the projectile 4.

Une telle disposition facilite le montage de l'arme, le projectile portant le boîtier de charge propulsive constituant alors un sous ensemble. A la sortie du tube de l'arme les efforts aérodynamiques provoquent l'éjection de la partie d'enveloppe 7a qui ne perturbe donc pas la trajectoire du projectile.Such an arrangement facilitates mounting of the weapon, the projectile carrying the propellant charge box then constituting a sub-assembly. At the exit of the barrel from the weapon, the aerodynamic forces cause the casing part 7a to be ejected, which therefore does not disturb the trajectory of the projectile.

Claims (12)

1-Boitier (3) destiné à contenir une charge propulsive et à être mis en place dans un tube (2) d'une arme sans recul, boîtier comportant une enveloppe cylindrique (7) destinée à venir s'ajuster de façon glissante dans le tube de l'arme, et délimitée par deux parois latérales (8,9), boîtier caractérisé en ce que l'enveloppe cylindrique (7) est réalisée d'une seule pièce et présente au moins une amorce de rupture annulaire (10) et en ce que, après rupture de cette dernière sous l'effet de la pression des gaz engendrés par la charge propulsive, le boîtier (3) se trouve partagé en au moins deux éléments libres de se translater l'un par rapport à l'autre, chaque élément portant une partie d'enveloppe (7a, 7b) assurant une étanchéité aux gaz.1-Casing (3) intended to contain a propellant charge and to be put in place in a tube (2) of a recoilless weapon, casing comprising a cylindrical casing (7) intended to come to adjust in a sliding manner in the barrel, and delimited by two side walls (8,9), housing characterized in that the cylindrical casing (7) is made in one piece and has at least one annular rupture initiator (10) and in that, after rupture of the latter under the effect of the pressure of the gases generated by the propellant charge, the housing (3) is divided into at least two elements which are free to translate relative to each other , each element carrying an envelope part (7a, 7b) ensuring gas tightness. 2-Boitier selon la revendication 1, caractérisé en ce que l'enveloppe cylindrique présente deux amorces de rupture (10a,10b) chacune d'elle étant disposée au voisinage d'une paroi latérale différente.2-housing according to claim 1, characterized in that the cylindrical casing has two fracture primers (10a, 10b) each of which being arranged in the vicinity of a different side wall. 3-Boitier selon la revendication 2, caractérisé en ce que les amorces de ruptures (10a,10b) sont disposées de telle sorte qu'elles délimitent sur l'enveloppe une partie avant (7a) et une partie arrière (7b) de longueurs sensiblement égales.3-housing according to claim 2, characterized in that the ruptures primers (10a, 10b) are arranged so that they define on the envelope a front portion (7a) and a rear portion (7b) of substantially lengths equal. 4-Boitier selon une des revendications 1 à 3, caractérisé en ce qu'au moins une paroi latérale est constituée par un couvercle (8) rendu solidaire de l'enveloppe (7) par un moyen de liaison.4-housing according to one of claims 1 to 3, characterized in that at least one side wall is constituted by a cover (8) made integral with the envelope (7) by a connecting means. 5-Boitier selon la revendication 4, caractérisé en ce que le couvercle (8) présente une gorge périphérique (18) dans laquelle vient se loger un rebord interne (17) de l'enveloppe (7), rebord et gorge assurant la solidarisation de l'enveloppe (7) et du couvercle (8).5-housing according to claim 4, characterized in that the cover (8) has a peripheral groove (18) in which is housed an internal rim (17) of the envelope (7), rim and groove ensuring the attachment of the envelope (7) and the cover (8). 6-Boitier selon une des revendications 4 ou 5, caractérisé en ce qu'une paroi latérale (9) est formée d'une seule pièce avec l'enveloppe (7).6-housing according to one of claims 4 or 5, characterized in that a side wall (9) is formed in one piece with the casing (7). 7-Boitier selon une des revendications 4 à 6, caractérisé en ce que le couvercle (8) est formé par une partie arrière du projectile (4).7-housing according to one of claims 4 to 6, characterized in that the cover (8) is formed by a rear part of the projectile (4). 8-Boitier selon une des revendications 1 à 7, caractérisé en ce que l'amorce de rupture (10) résulte d'un amincissement de l'enveloppe cylindrique (7).8-housing according to one of claims 1 to 7, characterized in that the rupture initiation (10) results from a thinning of the cylindrical envelope (7). 9-Boitier selon une des revendications 1 à 8, caractérisé en ce qu'il comporte une cuvette (20) en mousse compressible destinée à réaliser un calage de la charge propulsive.9-housing according to one of claims 1 to 8, characterized in that it comprises a bowl (20) in compressible foam intended to achieve a setting of the propellant charge. 10-Boîtier selon une des revendications 1 à 9, caractérisé en ce que l'enveloppe (7) est réalisée en matière plastique souple à fort coefficient d'allongement et faible coefficient de frottement.10-housing according to one of claims 1 to 9, characterized in that the envelope (7) is made of flexible plastic material with high coefficient of elongation and low coefficient of friction. 11-Boitier selon une des revendications 1 à 10, caractérisé en ce que la charge propulsive est initiée par un allumeur (12), disposé à l'intérieur du boitier et au niveau de l'axe (22) de celui-ci, allumeur prenant appui dans au moins un logement (14,15) aménagé dans une paroi latérale (8,9).11-box according to one of claims 1 to 10, characterized in that the propellant charge is initiated by an igniter (12), disposed inside the box and at the axis (22) thereof, igniter taking support in at least one housing (14,15) arranged in a side wall (8,9). 12-Boitier (3) destiné à contenir une charge propulsive et à être mis en place dans un tube (2) d'une arme sans recul, boîtier constitué de deux demi-boîtiers (3a,3b) comportant chacun une enveloppe cylindrique (71a, 71 b) destinée à venir s'ajuster de façon glissante dans le tube de l'arme, et portant chacune une paroi latérale (26a,26b), boîtier caractérisé en ce que chaque enveloppe porte une amorce de rupture annulaire (10a,10b), et en ce que, après rupture de ces dernières sous l'effet de la pression des gaz engendrés par la charge propulsive, le boîtier (3) se trouve partagé en au moins deux éléments libres de se translater l'un par rapport à l'autre, chaque élément portant une partie d'enveloppe (7a, 7b) assurant une étanchéité aux gaz.12-Box (3) intended to contain a propellant charge and to be put in place in a tube (2) of a recoilless weapon, box made up of two half-boxes (3a, 3b) each comprising a cylindrical envelope (71a , 71 b) intended to be slidably adjusted in the barrel of the weapon, and each carrying a side wall (26a, 26b), housing characterized in that each envelope carries an annular rupture initiator (10a, 10b ), and in that, after rupture of the latter under the effect of the pressure of the gases generated by the propellant charge, the housing (3) is divided into at least two elements free to translate one relative to the other, each element carrying an envelope part (7a, 7b) ensuring gas tightness.
EP93402536A 1992-10-22 1993-10-14 Case for a propellant charge Expired - Lifetime EP0594482B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9212643 1992-10-22
FR9212643A FR2697327B1 (en) 1992-10-22 1992-10-22 Box for propellant charge.

Publications (2)

Publication Number Publication Date
EP0594482A1 true EP0594482A1 (en) 1994-04-27
EP0594482B1 EP0594482B1 (en) 1997-01-15

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EP93402536A Expired - Lifetime EP0594482B1 (en) 1992-10-22 1993-10-14 Case for a propellant charge

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US (1) US5370032A (en)
EP (1) EP0594482B1 (en)
JP (1) JPH06201296A (en)
AT (1) ATE147846T1 (en)
AU (1) AU671150B2 (en)
DE (1) DE69307453T2 (en)
ES (1) ES2096887T3 (en)
FR (1) FR2697327B1 (en)

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FR2714165B1 (en) * 1993-12-22 1996-02-09 Luchaire Defense Sa Dispersible counterweight system for recoilless weapon.
FR2722872B1 (en) * 1994-07-19 1996-10-04 Lacroix Soc E PYROTECHNIC DEVICE FOR LAUNCHING AT LEAST ONE PROJECTILE
FR2770637B1 (en) 1997-11-03 1999-12-03 Giat Ind Sa PROJECTILE WITH SHAPED LOAD AND WEAPON SYSTEM HAVING SUCH A PROJECTILE
FI20085083L (en) * 2008-01-31 2009-08-01 Patria Weapon Systems Oy Arrangement and method of supporting a shell in a barrel of a breech-loading weapon
EP3789725A1 (en) 2009-02-02 2021-03-10 Aerovironment Multimode unmanned aerial vehicle
CA2789722C (en) 2009-09-09 2018-08-28 Aerovironment, Inc. Systems and devices for remotely operated unmanned aerial vehicle report-suppressing launcher with portable rf transparent launch tube
CN106800085B (en) 2009-09-09 2020-08-18 威罗门飞行公司 Elevon control system
EP2858898B1 (en) * 2012-06-07 2017-10-18 AeroVironment, Inc. System for detachably coupling an unmanned aerial vehicle within a launch tube

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GB806194A (en) * 1954-03-17 1958-12-23 Latham Valentine Stewart Black Improvements in ammunition rounds for guns
GB2183800A (en) * 1985-11-29 1987-06-10 Oerlikon Buehrle Ag Recoilless firing device
FR2619616A1 (en) * 1987-08-17 1989-02-24 Messerschmitt Boelkow Blohm SABOT FOR EJECTING MASSES, IN PARTICULAR FOR EJECTING A MUNITION OF THE TUBE OF AN ARM
WO1992006344A1 (en) * 1990-09-27 1992-04-16 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Double piston propulsion unit

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DE3503040A1 (en) * 1985-01-30 1986-07-31 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn Device for firing projectiles without recoil and without a signature

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GB806194A (en) * 1954-03-17 1958-12-23 Latham Valentine Stewart Black Improvements in ammunition rounds for guns
GB2183800A (en) * 1985-11-29 1987-06-10 Oerlikon Buehrle Ag Recoilless firing device
FR2619616A1 (en) * 1987-08-17 1989-02-24 Messerschmitt Boelkow Blohm SABOT FOR EJECTING MASSES, IN PARTICULAR FOR EJECTING A MUNITION OF THE TUBE OF AN ARM
WO1992006344A1 (en) * 1990-09-27 1992-04-16 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Double piston propulsion unit

Also Published As

Publication number Publication date
DE69307453T2 (en) 1997-05-22
FR2697327B1 (en) 1994-12-30
JPH06201296A (en) 1994-07-19
US5370032A (en) 1994-12-06
AU4913693A (en) 1994-05-05
EP0594482B1 (en) 1997-01-15
FR2697327A1 (en) 1994-04-29
AU671150B2 (en) 1996-08-15
ATE147846T1 (en) 1997-02-15
ES2096887T3 (en) 1997-03-16
DE69307453D1 (en) 1997-02-27

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