EP0471616B1 - Rotational motion prevention device between an arrow-type projectile and its support - Google Patents

Rotational motion prevention device between an arrow-type projectile and its support Download PDF

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Publication number
EP0471616B1
EP0471616B1 EP91402229A EP91402229A EP0471616B1 EP 0471616 B1 EP0471616 B1 EP 0471616B1 EP 91402229 A EP91402229 A EP 91402229A EP 91402229 A EP91402229 A EP 91402229A EP 0471616 B1 EP0471616 B1 EP 0471616B1
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EP
European Patent Office
Prior art keywords
bar
penetrator
sabot
shoe
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91402229A
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German (de)
French (fr)
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EP0471616A1 (en
Inventor
Marc Berville
Joel Leblond
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Giat Industries SA
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Giat Industries SA
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Filing date
Publication date
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Publication of EP0471616A1 publication Critical patent/EP0471616A1/en
Application granted granted Critical
Publication of EP0471616B1 publication Critical patent/EP0471616B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
    • F42B14/061—Sabots for long rod fin stabilised kinetic energy projectiles, i.e. multisegment sabots attached midway on the projectile
    • F42B14/062—Sabots for long rod fin stabilised kinetic energy projectiles, i.e. multisegment sabots attached midway on the projectile characterised by contact surfaces between projectile and sabot
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00—Ammunition and explosives
    • Y10S102/703—Flechette

Definitions

  • the field of the present invention is that of devices for stopping rotation between a threaded bar and a shoe of an arrow projectile.
  • An arrow projectile is made up in a known way of an under-calibrated bar secured to a caliber shoe.
  • the sabot is made up of several segments (generally three), which separate and release the bar at the exit of the barrel of the weapon under the action of aerodynamic forces.
  • this position determines the lengths of the parts of the bar which protrude at the front and at the rear of the shoe, lengths which must be respected so that the complete munition can meet the constraints of automatic loading.
  • Compliance with these lengths also conditions the mechanical strength of the projectile during the launching phase.
  • Document DE-A-2007822 describes a calibrated gyro-stabilized projectile which is made integral in rotation with a shoe by radial pins. These pins come in housings made at the rear part of the projectile.
  • the drive shoe is in one piece, the pins are in a first case released from the projectile under the effect of centrifugal forces, and in a second case released by the shoe itself, their housing in the projectile then being in the form of an open gutter. at the back of it.
  • the document EP-A-255570 describes an arrow type munition in which rotational connecting pins are arranged between a one-piece shoe and a non-threaded part of the bar. This ammunition is drawn in a rifled tube and the connecting pins are released by centrifugal forces inside the tube itself so as to allow controlled rotation of the bar relative to the shoe.
  • Document FR-A-2087797 describes a gyrostabilized calibrated projectile comprising two sabots.
  • the projectile is linked in rotation with the hooves by means of axial pins.
  • an obstacle engaged in the body of the bar will be difficult to release when the shoe is released. It can remain engaged in the bar and harm the ballistics of the latter or it can even disturb the separation of the hoof and the bar.
  • the subject of the invention is a device for stopping rotation between a threaded bar and a shoe of an arrow projectile, in particular of large caliber and intended to be fired from a weapon practically without rotational speed, characterized in that '' It comprises at least one obstacle disposed in a housing produced radially in the shoe, immobilized in translation in its housing by a locking means and one end of which comes into contact with the bar at a bearing surface located at a distance from the axis of the bar which is at least equal to the bottom diameter of the bar.
  • the obstacle is a pin and the housing is a bore with an axis substantially perpendicular to the axis of the shoe, and the pin comes in a substantially cylindrical cavity made in the thread of the bar .
  • the blocking means may include a tight adjustment of the pin in its bore.
  • the obstacle is a longidudinal key which comes into contact with the bar at the level of a corresponding longitudinal imprint produced in the thread of the bar.
  • an obstacle will be associated with at least three housings arranged on the shoe and at least four impressions made on the bar.
  • the bore opens at the top of a tooth of the shoe thread and has a diameter less than the width of this top of the tooth, and the pin can then be produced in a malleable material chosen so that it creeps and becomes encrusted between the threads of the bar and of the shoe on either side of the bore during the positioning of the pin, thus constituting the blocking means.
  • the malleable material can be chosen from the following materials: annealed copper, semi-hard iron, polyamide, lead, tin.
  • the housing may be arranged at a separation plane between two elements of the shoe and in a substantially symmetrical manner relative to this plane.
  • the obstacle does not disturb the separation of the hoof and the bar at the outlet of the barrel of the weapon.
  • Figure 1 is a schematic partial view in longitudinal section of an arrow projectile carrying a first embodiment of the stop device according to the invention.
  • FIG. 2 is a cross section along the plane AA of FIG. 1.
  • Figure 3 is an enlarged view of a detail of Figure 1.
  • Figure 4 is an enlarged view of a second embodiment of the stop device according to the invention.
  • Figure 5 is a schematic partial view in longitudinal section of an arrow projectile carrying a third embodiment of the stop device according to the invention.
  • FIG. 6 is a cross section along the plane BB of FIG. 5.
  • Figure 7 is a schematic partial view in longitudinal section of an arrow projectile carrying a fourth embodiment of the stop device according to the invention.
  • FIG. 8 is a cross section along the plane CC of FIG. 7.
  • an arrow projectile comprises a shoe 1, made up of three segments 1a, 1b, 1c, and a bar 2.
  • the shoe 1 carries, disposed in a groove, a belt 3 which is intended to achieve during firing the seal between the projectile and the barrel of the weapon (not shown).
  • the bar is driven by the shoe by means of a thread, which is shown here schematically, the thin line representing the diameter at the bottom of the thread 9 of the bar.
  • the shoe 1 carries at its rear part (or possibly at its front part) at least one housing, which here is a bore 7 whose axis 5 is substantially perpendicular to the axis 4 of the shoe and the bar.
  • An obstacle which here is a substantially cylindrical pin 6, is disposed in this bore and comes into contact at one end 8 with the bar 2.
  • the bar 2 carries a cylindrical imprint 17, the bottom of which constitutes a bearing surface 18 for the substantially flat end 8 of the pin 6.
  • the depth of the imprint is less than or equal to the depth of the thread of the bar, thus the bearing surface 18 is at a distance from the axis 4 of the bar which is greater than or equal to the diameter of the body of the bar, c 'is to say at the bottom diameter 9 of the bar.
  • the body of the bar is not damaged, which ensures mechanical resistance on the target equivalent to that of an imprinted bar.
  • the pin is immobilized in its bore by a locking means which is here a tight relative adjustment (of the order of a few microns of tightening).
  • the pin will be made of aluminum or plastic such as polyamide 6-6, and its diameter will be chosen slightly greater than the pitch of the bar thread (for example a few tenths), so regardless of the position of the bore 7 on is certain that the pin 6 will come into contact with the teeth of the thread of the bar.
  • the bore is produced at a separation plane between two segments 1a and 1b of the shoe, and in a substantially symmetrical manner relative to this plan, such an arrangement is favorable to the proper separation of the shoe segments.
  • the drilling of the bore will be carried out after mounting the shoe on the bar and at the same time as the production of the cylindrical impression 17, a small cylindrical cutter making it possible to obtain the bearing surface 18 substantially. plane.
  • a rear seal (not shown here, see for example patent EP306615, and the Statutory Invention USH265), will be placed on the rear face 10 of the shoe and will seal the bore 7, making the seal at this level.
  • FIG. 4 shows a second embodiment of the invention in which the bore 7 is produced before the bar is mounted in the shoe, and in a location such that it opens at the level of a tooth tip of the shoe.
  • the bore then has a diameter substantially less than the truncation of the top of the hoof tooth (of the order of 0.5 mm).
  • the pawn introduced will be chosen from a malleable material having mechanical characteristics such that, put in place with an effort of the order of a few tens of DaN, it will creep and become embedded between the threads of the bar and the shoe. and other of the bore 7, in the functional clearance 11 existing between the profile of the thread of the bar 2 and that of the thread of the shoe 1.
  • the bead 12 thus produced by being introduced into the game 11, will ensure the stopping in rotation of the bar and the shoe, and will also constitute the means of blocking the pin in its bore.
  • the bearing surface between the pin and the bar here comprises the thread bottom 9 itself as well as part of the profile of the thread.
  • the bore will also be positioned at the plane of separation between two segments of the shoe, and in a substantially symmetrical manner relative to this plane.
  • Figures 5 and 6 show a third embodiment of the invention in which the obstacle is a key 13 disposed in a longitudinal housing 14 of the shoe.
  • the bar has a longitudinal imprint 15 to receive this key, the imprint has, as in the example of Figures 1 to 3, a depth less than or equal to the depth of the thread of the bar.
  • the bearing surface 18 is arranged at a distance from the axis 4 of the bar which is at least equal to the diameter at the bottom of the thread 9 of the bar, the impression therefore does not penetrate into the body of the bar, which avoids degrading its mechanical strength and facilitates the separation of the key and the bar when the bar is released by the shoe at the outlet of the barrel.
  • the key will be made of aluminum or plastic, for example Poyamide 6-6.
  • the cavity 15 will have a length such that it is possible to put the key in place after mounting the bar in the shoe.
  • a number of housings in the shoe will be provided which is different from the number of impressions made on the bar.
  • the rear seal will be placed on the rear face 10 of the shoe and will seal the housings 14 and indentations 15 making the seal at this level.
  • Figures 7 and 8 show a last embodiment in which the obstacle is a cylindrical pin 6 disposed in a through groove 16 made on the shoe, and coming in a cylindrical cavity 17 arranged on the bar with the same depth conditions as above.
  • a number of grooves in the shoe is provided which is different from the number of impressions made on the bar.
  • the accuracy of the relative positioning obtained is the same as for the previous example, and a seal will also be placed on the rear face 10 of the shoe making the seal at the level of the grooves and of the indentations.
  • the obstacles and fingerprints housings may possibly be arranged at the front part of the shoe, it will then be possible to deposit, after placing the obstacles, a point of glue at the housings.

Abstract

The technical sector of the invention is that of devices for stopping rotation between a rifled bar and a sabot of an arrow-type projectile. The device according to the invention is characterized in that it comprises at least one obstacle (6) disposed in a housing (7) made radially in the sabot (1), immobilized in translation in its housing by a locking means and one end (8) of which comes into contact with the bar (2) at the level of a bearing surface arranged at a distance from the axis (4) of the bar which is at least equal to the maximum diameter of the rifling of the bar. Application to large-caliber arrow-type munitions.

Description

Le domaine de la présente invention est celui des dispositifs d'arrêt en rotation entre un barreau fileté et un sabot d'un projectile flèche.The field of the present invention is that of devices for stopping rotation between a threaded bar and a shoe of an arrow projectile.

Un projectile flèche est composé de façon connue d'un barreau sous-calibré solidaire d'un sabot au calibre.An arrow projectile is made up in a known way of an under-calibrated bar secured to a caliber shoe.

Le sabot est constitué de plusieurs segments (généralement trois), qui se séparent et libèrent le barreau à la sortie du tube de l'arme sous l'action des efforts aérodynamiques.The sabot is made up of several segments (generally three), which separate and release the bar at the exit of the barrel of the weapon under the action of aerodynamic forces.

Il est nécessaire de maîtriser la position relative du barreau et du sabot d'un projectile flèche au millimètre près.It is necessary to master the relative position of the bar and the shoe of an arrow projectile to the nearest millimeter.

En effet cette position détermine les longueurs des parties du barreau qui dépassent à l'avant et à l'arrière du sabot, longueurs qui doivent être respectées pour que la munition complète puisse répondre aux contraintes du chargement automatique.Indeed, this position determines the lengths of the parts of the bar which protrude at the front and at the rear of the shoe, lengths which must be respected so that the complete munition can meet the constraints of automatic loading.

Le respect de ces longueurs conditionne également la tenue mécanique du projectile lors de la phase de lancement en canon.Compliance with these lengths also conditions the mechanical strength of the projectile during the launching phase.

Dans le passé on a cherché à réaliser l'arrêt en rotation de différentes façons:In the past, we tried to achieve the rotation stop in different ways:

Ainsi on a utilisé en le faisant adhérer au barreau, le joint élastomère qui réalise l'étanchéité entre les segments du sabot. L'inconvénient d'une telle disposition est qu'elle risque de laisser subsister des reliquats d'élastomère sur le barreau qui peuvent perturber sa trajectoire.Thus, by making it adhere to the bar, the elastomeric seal which makes the seal between the shoe segments has been used. The disadvantage of such an arrangement is that it risks leaving residual elastomer on the bar which can disturb its trajectory.

On a également, comme cela se trouve décrit dans le document FR-A-2611889, sur lequel on base le préambule de la revendication indépendante 1, disposé une rondelle arrière qui réalise à la fois un calage du chargement, un soutien radial du projectile relativement à la douille et une liaison en rotation du sabot et du barreau.There is also, as described in document FR-A-2611889, on which the preamble of independent claim 1 is based, arranged a rear washer which performs both a setting of the load, a radial support of the projectile relatively to the socket and a rotational connection of the shoe and the bar.

Une telle solution est coûteuse et difficile à adapter aux projectiles flèches à hautes performances actuels pour lesquels le barreau est long et doit être entraîné par un sabot long également (plus de 350 mm pour un calibre de 120 mm).Such a solution is expensive and difficult to adapt to current high performance arrow projectiles for which the bar is long and must also be driven by a long shoe (more than 350 mm for a caliber of 120 mm).

En effet de tels sabots présentent des parties avant et arrière dont le profil est sensiblement conique et dont l'épaisseur réduite ne peut recevoir les moyens de blocage décrits dans ce brevet.Indeed, such shoes have front and rear parts whose profile is substantially conical and whose reduced thickness can not receive the locking means described in this patent.

Le document DE-A-2007822 décrit un projectile sous calibré gyrostabilisé qui est rendu solidaire en rotation d'un sabot par des goupilles radiales. Ces goupilles viennent dans des logements réalisés à la partie arrière du projectile.Document DE-A-2007822 describes a calibrated gyro-stabilized projectile which is made integral in rotation with a shoe by radial pins. These pins come in housings made at the rear part of the projectile.

Le sabot d'entraînement est monobloc, les goupilles sont dans un premier cas libérées du projectile sous l'effet des efforts centrifuges, et dans un deuxième cas libérées par le sabot lui même, leur logement dans le projectile étant alors en forme de gouttière ouverte à la partie arrière de celui-ci.The drive shoe is in one piece, the pins are in a first case released from the projectile under the effect of centrifugal forces, and in a second case released by the shoe itself, their housing in the projectile then being in the form of an open gutter. at the back of it.

Ces solutions ne sont pas transposables à une munition de type flèche. En effet, ces dernières ne sont pas animées d'un mouvement de rotation suffisant pour assurer l'éjection de goupilles de leur logement, et la longueur des barreaux flèches est telle que leur partie arrière portant l'empennage se situe bien en arrière du sabot et ne peut donc pas recevoir de goupille d'entrainement.These solutions cannot be transposed to arrow type ammunition. Indeed, the latter are not driven in a sufficient rotational movement to ensure the ejection of pins from their housing, and the length of the arrow bars is such that their rear part carrying the tail unit is well behind the shoe. and therefore cannot receive a drive pin.

Le document EP-A-255570 décrit une munition de type flèche dans laquelle des goupilles de liaison en rotation sont disposées entre un sabot monobloc et une partie non filetée du barreau. Cette munition est tirée dans un tube rayé et les goupilles de liaison sont libérées par les efforts centrifuges à l'intérieur même du tube de façon à autoriser une rotation maitrisée du barreau relativement au sabot.The document EP-A-255570 describes an arrow type munition in which rotational connecting pins are arranged between a one-piece shoe and a non-threaded part of the bar. This ammunition is drawn in a rifled tube and the connecting pins are released by centrifugal forces inside the tube itself so as to allow controlled rotation of the bar relative to the shoe.

Une telle solution n'est pas transposable à une munition flèche de gros calibre dans laquelle sensiblement toute la longueur du barreau qui est en contact avec le sabot est filetée et pour laquelle la vitesse de rotation est insuffisante pour assurer l'éjection des goupilles.Such a solution cannot be transposed to a large caliber arrow munition in which substantially the entire length of the bar which is in contact with the shoe is threaded and for which the speed of rotation is insufficient to ensure the ejection of the pins.

Le document FR-A-2087797 décrit un projectile sous calibré gyrostabilisé comportant deux sabots. Le projectile est lié en rotation avec les sabots au moyen de goupilles axiales.Document FR-A-2087797 describes a gyrostabilized calibrated projectile comprising two sabots. The projectile is linked in rotation with the hooves by means of axial pins.

En fait, il est délicat de réaliser une liaison en rotation au moyen de goupilles car tout usinage dans le barreau conduit à une fragilisation de celui-ci, fragilisation qui est préjudiciable aux performances du barreau sur la cible.In fact, it is difficult to make a connection in rotation by means of pins because any machining in the bar leads to a weakening thereof, weakening which is detrimental to the performance of the bar on the target.

De plus, un obstacle engagé dans le corps de barreau se dégagera difficilement lors de la libération du sabot. Il pourra rester engagé dans le barreau et nuire à la balistique de ce dernier ou encore il pourra même perturber la séparation du sabot et du barreau.In addition, an obstacle engaged in the body of the bar will be difficult to release when the shoe is released. It can remain engaged in the bar and harm the ballistics of the latter or it can even disturb the separation of the hoof and the bar.

C'est le but de l'invention que de proposer des moyens de liaison en rotation entre un barreau et un sabot de projectile flèche, et plus particulièrement de projectile flèche de gros calibre, moyens ne nuisant pas à la tenue mécanique du barreau et ne perturbant pas la séparation du sabot et du barreau à la sortie du tube de l'arme.It is the object of the invention to propose means for connecting in rotation between a bar and a saber of arrow projectile, and more particularly of large caliber arrow projectile, means not detrimental to the mechanical strength of the bar and do not not disturbing the separation of the hoof and the bar at the exit of the barrel of the weapon.

C'est un autre but de l'invention que de proposer des moyens dont la mise en place est facile d'un point de vue industriel.It is another object of the invention to propose means the installation of which is easy from an industrial point of view.

Ainsi l'invention a pour objet un dispositif d'arrêt en rotation entre un barreau fileté et un sabot d'un projectile flèche, notamment de gros calibre et destiné à être tiré d'une arme pratiquement sans vitesse de rotation, caractérisé en ce qu'il comprend au moins un obstacle disposé dans un logement réalisé radialement dans le sabot, immobilisé en translation dans son logement par un moyen de blocage et dont une extrémité vient en contact avec le barreau au niveau d'une surface d'appui située à une distance de l'axe du barreau qui est au moins égale au diamètre à fond de filet du barreau.Thus, the subject of the invention is a device for stopping rotation between a threaded bar and a shoe of an arrow projectile, in particular of large caliber and intended to be fired from a weapon practically without rotational speed, characterized in that '' It comprises at least one obstacle disposed in a housing produced radially in the shoe, immobilized in translation in its housing by a locking means and one end of which comes into contact with the bar at a bearing surface located at a distance from the axis of the bar which is at least equal to the bottom diameter of the bar.

L'avantage d'une telle disposition est qu'elle assure de façon simple l'arrêt en rotation souhaité sans pour autant créer de zone de fragilisation du barreau.The advantage of such an arrangement is that it simply ensures the desired rotation stop without creating a weakening zone of the bar.

Selon un premier mode de réalisation de l'invention, l'obstacle est un pion et le logement est un alésage d'axe sensiblement perpendiculaire à l'axe du sabot, et le pion vient dans une empreinte sensiblement cylindrique réalisée dans le filetage du barreau.According to a first embodiment of the invention, the obstacle is a pin and the housing is a bore with an axis substantially perpendicular to the axis of the shoe, and the pin comes in a substantially cylindrical cavity made in the thread of the bar .

Dans ce cas le moyen de blocage pourra comprendre un ajustement serré du pion dans son alésage.In this case the blocking means may include a tight adjustment of the pin in its bore.

Selon un deuxième mode de réalisation, l'obstacle est une clavette longidudinale qui vient en contact avec le barreau au niveau d'une empreinte longitudinale correspondante réalisée dans le filetage du barreau.According to a second embodiment, the obstacle is a longidudinal key which comes into contact with the bar at the level of a corresponding longitudinal imprint produced in the thread of the bar.

On associera de préférence un obstacle à au moins trois logements aménagés sur le sabot et à au moins quatre empreintes réalisées sur le barreau.Preferably, an obstacle will be associated with at least three housings arranged on the shoe and at least four impressions made on the bar.

On facilite ainsi la fabrication des projectiles en permettant une mise en place des obstacles sans repérage de position préalable.This makes it easier to manufacture projectiles by allowing obstacles to be put in place without identifying the position.

Selon un troisième mode de réalisation de l'invention, l'alésage débouche au niveau du sommet d'une dent du filetage du sabot et présente un diamètre inférieur à la largeur de ce sommet de dent, et le pion pourra alors être réalisé en un matériau malléable choisi de telle sorte qu'il vienne fluer et s'incruster entre les filetages du barreau et du sabot de part et d'autre de l'alésage lors de la mise en place du pion, constituant ainsi le moyen de blocage.According to a third embodiment of the invention, the bore opens at the top of a tooth of the shoe thread and has a diameter less than the width of this top of the tooth, and the pin can then be produced in a malleable material chosen so that it creeps and becomes encrusted between the threads of the bar and of the shoe on either side of the bore during the positioning of the pin, thus constituting the blocking means.

Le matériau malléable pourra être choisi parmi les matériaux suivants: cuivre recuit, fer mi-dur, polyamide, plomb, étain.The malleable material can be chosen from the following materials: annealed copper, semi-hard iron, polyamide, lead, tin.

Selon un mode de réalisation, le logement pourra être disposé au niveau d'un plan de séparation entre deux éléments du sabot et de façon sensiblement symétrique relativement à ce plan.According to one embodiment, the housing may be arranged at a separation plane between two elements of the shoe and in a substantially symmetrical manner relative to this plane.

Ainsi l'obstacle ne perturbe pas la séparation du sabot et du barreau à la sortie du tube de l'arme.Thus the obstacle does not disturb the separation of the hoof and the bar at the outlet of the barrel of the weapon.

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

La figure 1 est une vue partielle schématique en coupe longitudinale d'un projectile flèche portant un premier mode de réalisation du dispositif d'arrêt selon l'invention.Figure 1 is a schematic partial view in longitudinal section of an arrow projectile carrying a first embodiment of the stop device according to the invention.

La figure 2 est une coupe transversale suivant le plan AA de la figure 1.FIG. 2 is a cross section along the plane AA of FIG. 1.

La figure 3 est une vue agrandie d'un détail de la figure 1.Figure 3 is an enlarged view of a detail of Figure 1.

La figure 4 est une vue agrandie d'un deuxième mode de réalisation du dispositif d'arrêt selon l'invention.Figure 4 is an enlarged view of a second embodiment of the stop device according to the invention.

La figure 5 est une vue partielle schématique en coupe longitudinale d'un projectile flèche portant un troisième mode de réalisation du dispositif d'arrêt selon l'invention.Figure 5 is a schematic partial view in longitudinal section of an arrow projectile carrying a third embodiment of the stop device according to the invention.

La figure 6 est une coupe transversale suivant le plan BB de la figure 5.FIG. 6 is a cross section along the plane BB of FIG. 5.

La figure 7 est une vue partielle schématique en coupe longitudinale d'un projectile flèche portant un quatrième mode de réalisation du dispositif d'arrêt selon l'invention.Figure 7 is a schematic partial view in longitudinal section of an arrow projectile carrying a fourth embodiment of the stop device according to the invention.

La figure 8 est une coupe transversale suivant le plan CC de la figure 7.FIG. 8 is a cross section along the plane CC of FIG. 7.

En se reportant aux figures 1 et 2, un projectile flèche comprend un sabot 1, constitué de trois segments 1a, 1b, 1c, et un barreau 2.Referring to FIGS. 1 and 2, an arrow projectile comprises a shoe 1, made up of three segments 1a, 1b, 1c, and a bar 2.

Le sabot 1 porte, disposée dans une gorge, une ceinture 3 qui est destinée à réaliser lors du tir l'étanchéité entre le projectile et le tube de l'arme (non représenté).The shoe 1 carries, disposed in a groove, a belt 3 which is intended to achieve during firing the seal between the projectile and the barrel of the weapon (not shown).

L'entraînement du barreau par le sabot est assuré au moyen d'un filetage, qui est représenté ici de façon schématique, le trait fin figurant le diamètre au fond de filet 9 du barreau.The bar is driven by the shoe by means of a thread, which is shown here schematically, the thin line representing the diameter at the bottom of the thread 9 of the bar.

Le sabot 1 porte au niveau de sa partie arrière (ou éventuellement au niveau de sa partie avant) au moins un logement, qui est ici un alésage 7 dont l'axe 5 est sensiblement perpendiculaire à l'axe 4 du sabot et du barreau. Un obstacle, qui est ici un pion 6 sensiblement cylindrique, est disposé dans cet alésage et vient en contact par une extrémité 8 avec le barreau 2.The shoe 1 carries at its rear part (or possibly at its front part) at least one housing, which here is a bore 7 whose axis 5 is substantially perpendicular to the axis 4 of the shoe and the bar. An obstacle, which here is a substantially cylindrical pin 6, is disposed in this bore and comes into contact at one end 8 with the bar 2.

Comme cela est visible de façon plus précise sur la figure 3, le barreau 2 porte une empreinte cylindrique 17 dont le fond constitue une surface d'appui 18 pour l'extrémité 8 sensiblement plane du pion 6.As can be seen more precisely in FIG. 3, the bar 2 carries a cylindrical imprint 17, the bottom of which constitutes a bearing surface 18 for the substantially flat end 8 of the pin 6.

La profondeur de l'empreinte est inférieure ou égale à la profondeur du filetage du barreau, ainsi la surface d'appui 18 se trouve à une distance de l'axe 4 du barreau qui est supérieure ou égale au diamètre du corps du barreau, c'est à dire au diamètre à fond de filet 9 du barreau.The depth of the imprint is less than or equal to the depth of the thread of the bar, thus the bearing surface 18 is at a distance from the axis 4 of the bar which is greater than or equal to the diameter of the body of the bar, c 'is to say at the bottom diameter 9 of the bar.

Ainsi le corps du barreau ne se trouve pas entamé ce qui assure une tenue mécanique sur la cible équivalente à celle d'un barreau sans empreinte.Thus, the body of the bar is not damaged, which ensures mechanical resistance on the target equivalent to that of an imprinted bar.

De plus la pénétration de l'obstacle dans le barreau étant réduite, la séparation du sabot et du barreau ne se trouve pas perturbée par l'obstacle.In addition, the penetration of the obstacle into the bar being reduced, the separation of the shoe and the bar is not disturbed by the obstacle.

Le pion est immobilisé dans son alésage par un moyen de blocage qui est ici un ajustement relatif serré (de l'ordre de quelques microns de serrage).The pin is immobilized in its bore by a locking means which is here a tight relative adjustment (of the order of a few microns of tightening).

Il serait possible également de prévoir un ajustement glissant, le moyen de blocage pouvant alors être un point de colle.It would also be possible to provide a sliding adjustment, the blocking means then being able to be a point of glue.

Le pion sera réalisé en aluminium ou en matière plastique telle le polyamide 6-6, et son diamètre sera choisi légèrement supérieur au pas du filetage du barreau (par exemple de quelques dixièmes), ainsi quelle que soit la position de l'alésage 7 on est certain que le pion 6 viendra en contact avec les dents du filetage du barreau.The pin will be made of aluminum or plastic such as polyamide 6-6, and its diameter will be chosen slightly greater than the pitch of the bar thread (for example a few tenths), so regardless of the position of the bore 7 on is certain that the pin 6 will come into contact with the teeth of the thread of the bar.

Dans le mode particulier d'exécution qui est décrit et comme cela est visible sur la figure 2, l'alésage est réalisé au niveau d'un plan de séparation entre deux segments 1a et 1b du sabot, et de façon sensiblement symétrique relativement à ce plan, une telle disposition est favorable à la bonne séparation des segments du sabot.In the particular embodiment which is described and as can be seen in FIG. 2, the bore is produced at a separation plane between two segments 1a and 1b of the shoe, and in a substantially symmetrical manner relative to this plan, such an arrangement is favorable to the proper separation of the shoe segments.

Du point de vue fabrication, le perçage de l'alésage sera réalisé après montage du sabot sur le barreau et en même temps que la réalisation de l'empreinte cylindrique 17, une petite fraise cylindrique permettant d'obtenir la surface d'appui 18 sensiblement plane.From the manufacturing point of view, the drilling of the bore will be carried out after mounting the shoe on the bar and at the same time as the production of the cylindrical impression 17, a small cylindrical cutter making it possible to obtain the bearing surface 18 substantially. plane.

Après mise en place du pion dans son logement, un joint d'étanchéité arrière (non représenté ici, voir par exemple le brevet EP306615, et la Statutory Invention USH265), sera disposé sur la face arrière 10 du sabot et viendra obturer l'alésage 7, réalisant l'étanchéité à ce niveau.After placing the pin in its housing, a rear seal (not shown here, see for example patent EP306615, and the Statutory Invention USH265), will be placed on the rear face 10 of the shoe and will seal the bore 7, making the seal at this level.

La figure 4 montre un deuxième mode de réalisation de l'invention dans lequel l'alésage 7 est réalisé avant le montage du barreau dans le sabot, et à un endroit tel qu'il débouche au niveau d'un sommet de dent du sabot.FIG. 4 shows a second embodiment of the invention in which the bore 7 is produced before the bar is mounted in the shoe, and in a location such that it opens at the level of a tooth tip of the shoe.

L'alésage présente alors un diamètre sensiblement inférieur à la troncature du sommet de dent du sabot (de l'ordre de 0.5 mm).The bore then has a diameter substantially less than the truncation of the top of the hoof tooth (of the order of 0.5 mm).

Le pion introduit sera choisi en un matériau malléable présentant des caractéristiques mécaniques telles que, mis en place avec un effort de l'ordre de quelques dizaines de DaN, il vienne fluer et s'incruster entre les filetages du barreau et du sabot, de part et d'autre de l'alésage 7, dans le jeu fonctionnel 11 existant entre le profil du filetage du barreau 2 et celui du filetage du sabot 1.The pawn introduced will be chosen from a malleable material having mechanical characteristics such that, put in place with an effort of the order of a few tens of DaN, it will creep and become embedded between the threads of the bar and the shoe. and other of the bore 7, in the functional clearance 11 existing between the profile of the thread of the bar 2 and that of the thread of the shoe 1.

Des matériaux tels le cuivre recuit, le fer mi-dur, le polyamide, le plomb ou l'étain sont bien adaptés à une telle déformation.Materials such as annealed copper, semi-hard iron, polyamide, lead or tin are well suited to such deformation.

Le bourrelet 12 ainsi réalisé, en s'introduisant dans le jeu 11, assurera l'arrêt en rotation du barreau et du sabot, et constituera également le moyen de blocage du pion dans son alésage.The bead 12 thus produced, by being introduced into the game 11, will ensure the stopping in rotation of the bar and the shoe, and will also constitute the means of blocking the pin in its bore.

La surface d'appui entre le pion et le barreau comprend ici le fond de filet 9 lui-même ainsi qu'une partie du profil du filetage.The bearing surface between the pin and the bar here comprises the thread bottom 9 itself as well as part of the profile of the thread.

De préférence l'alésage sera encore positionné au niveau du plan de séparation entre deux segments du sabot, et de façon sensiblement symétrique relativement à ce plan.Preferably, the bore will also be positioned at the plane of separation between two segments of the shoe, and in a substantially symmetrical manner relative to this plane.

Les figures 5 et 6 montrent un troisième mode de réalisation de l'invention dans lequel l'obstacle est une clavette 13 disposée dans un logement longitudinal 14 du sabot.Figures 5 and 6 show a third embodiment of the invention in which the obstacle is a key 13 disposed in a longitudinal housing 14 of the shoe.

Le barreau présente une empreinte longitudinale 15 pour recevoir cette clavette, l'empreinte a comme dans l'exemple des figures 1 à 3, une profondeur inférieure ou égale à la profondeur du filetage du barreau.The bar has a longitudinal imprint 15 to receive this key, the imprint has, as in the example of Figures 1 to 3, a depth less than or equal to the depth of the thread of the bar.

Ainsi la surface d'appui 18 est disposée à une distance de l'axe 4 du barreau qui est au moins égale au diamètre à fond de filet 9 du barreau, l'empreinte ne pénètre donc pas dans le corps même du barreau ce qui évite de dégrader sa tenue mécanique et facilite la séparation de la clavette et du barreau lors de la libération du barreau par le sabot à la sortie du tube de l'arme.Thus the bearing surface 18 is arranged at a distance from the axis 4 of the bar which is at least equal to the diameter at the bottom of the thread 9 of the bar, the impression therefore does not penetrate into the body of the bar, which avoids degrading its mechanical strength and facilitates the separation of the key and the bar when the bar is released by the shoe at the outlet of the barrel.

La clavette sera réalisée en aluminium ou matière plastique par exemple du Poyamide 6-6.The key will be made of aluminum or plastic, for example Poyamide 6-6.

L'empreinte 15 aura une longueur telle qu'il soit possible de mettre en place la clavette après le montage du barreau dans le sabot.The cavity 15 will have a length such that it is possible to put the key in place after mounting the bar in the shoe.

Afin de faciliter le montage, on prévoira un nombre de logements dans le sabot qui soit différent du nombre d'empreintes réalisées sur le barreau.In order to facilitate mounting, a number of housings in the shoe will be provided which is different from the number of impressions made on the bar.

Il devient ainsi facile d'amener en coïncidence un logement du sabot avec une empreinte du barreau tout en limitant la valeur de l'angle de rotation nécessaire pour amener ces deux éléments en coïncidence (et donc l'incertitude sur la position axiale finale relative du barreau et du sabot).It thus becomes easy to bring a shoe housing in coincidence with an imprint of the bar while limiting the value of the angle of rotation necessary to bring these two elements into coincidence (and therefore the uncertainty on the relative final axial position of the bar and hoof).

A titre d'exemple pour 3 logements sabot et 4 empreintes barreau, on obtient une précision de positionnement angulaire sabot/barreau de 1/24° de pas. Ce qui avec un filetage de pas égal à 4 mm, donne une précision de positionnement longitudinal du barreau de 1/6° de mm, une telle précision est compatible avec les tolérances de positionnement longitudinal du barreau qui sont habituellement de l'ordre du mm.For example, for 3 shoe housings and 4 bar impressions, one obtains a precision of angular shoe / bar positioning of 1/24 ° of step. Which, with a thread pitch of 4 mm, gives a longitudinal positioning accuracy of the bar of 1/6 ° mm, such precision is compatible with the tolerances of longitudinal positioning of the bar which are usually of the order of mm .

Il est donc possible de fabriquer séparément sabot et barreau portant leurs logements et empreintes respectives sans réaliser le moindre marquage préalable, le montage final permet d'obtenir à la fois le positionnement axial et angulaire souhaité.It is therefore possible to manufacture separately shoe and bar carrying their respective housings and imprints without carrying out the least preliminary marking, the final assembly makes it possible to obtain both the desired axial and angular positioning.

On pourra disposer les trois logements sur le sabot au niveau des plans de séparation entre les segments du sabot et de façon sensiblement symétrique relativement à ces plans, cela afin d'éviter toutes interférences lors de l'ouverture du sabot.It will be possible to arrange the three housings on the shoe at the level of the planes of separation between the segments of the shoe and in a substantially symmetrical manner relative to these planes, this in order to avoid any interference during the opening of the shoe.

Le joint d'étanchéité arrière sera disposé sur la face arrière 10 du sabot et viendra obturer les logements 14 et empreintes 15 réalisant l'étanchéité à ce niveau.The rear seal will be placed on the rear face 10 of the shoe and will seal the housings 14 and indentations 15 making the seal at this level.

Les figures 7 et 8 montrent un dernier mode de réalisation dans lequel l'obstacle est un pion cylindrique 6 disposé dans une rainure débouchante 16 réalisée sur le sabot, et venant dans une empreinte cylindrique 17 aménagée sur le barreau avec les mêmes conditions de profondeur que précédemment.Figures 7 and 8 show a last embodiment in which the obstacle is a cylindrical pin 6 disposed in a through groove 16 made on the shoe, and coming in a cylindrical cavity 17 arranged on the bar with the same depth conditions as above.

Comme dans l'exemple précédent on prévoit un nombre de rainures dans le sabot différent du nombre d'empreintes réalisées sur le barreau. Ici on prévoit trois rainures sur le sabot, disposées au niveau des plans de séparation entre les segments du sabot et de façon sensiblement symétrique relativement à ces plans, et quatre empreintes sur le barreau.As in the previous example, a number of grooves in the shoe is provided which is different from the number of impressions made on the bar. Here there are provided three grooves on the shoe, arranged at the separation planes between the shoe segments and in a substantially symmetrical manner relative to these planes, and four imprints on the bar.

Les usinages sont encore effectués avant le montage, mais dans ce mode particulier de réalisation, les empreintes ne sont plus visibles lors du montage du barreau, un repérage temporaire de leur position est donc nécessaire.The machining operations are still carried out before assembly, but in this particular embodiment, the indentations are no longer visible during assembly of the bar, a temporary identification of their position is therefore necessary.

Il serait possible également dans ce mode d'exécution de remplacer les rainures du sabot par trois alésages.It would also be possible in this embodiment to replace the shoe grooves with three bores.

Dans tous les cas la précision du positionnement relatif obtenu est la même que pour l'exemple précédent, et un joint d'étanchéité sera également disposé sur la face arrière 10 du sabot réalisant l'étanchéité au niveau des rainures et des empreintes.In all cases, the accuracy of the relative positioning obtained is the same as for the previous example, and a seal will also be placed on the rear face 10 of the shoe making the seal at the level of the grooves and of the indentations.

Dans tous les cas, les logements obstacles et empreintes pourront éventuellement être disposés à la partie avant du sabot, on pourra alors déposer après mise en place des obstacles un point de colle au niveau des logements.In all cases, the obstacles and fingerprints housings may possibly be arranged at the front part of the shoe, it will then be possible to deposit, after placing the obstacles, a point of glue at the housings.

Claims (10)

  1. A device for stopping rotation between a threaded penetrator (2) and a sabot (1) of a discarding-sabot projectile, notably of a large calibre and designed to be fired from a weapon having hardly any rotation speed, characterised in that it comprises at least one obstacle (7,14,16) made radially in the sabot (1), immobilised in translation in its housing by a locking means and wherein one end comes into contact with the penetrator (2) at the level of a bearing surface(18) located at a distance from the axis (4) of the penetrator which is at least equal to the diametre at the bottom of the thread (9) of the penetrator.
  2. A device according to Claim 1, characterised in that the obstacle is a peg (6) and in that the housing is a bore (7) having an axis (5) roughly perpendicular to the axis (4) of the sabot.
  3. A device according to Claim 2, characterised in that the peg (6) engages in a roughly cylindrical indentation (17) made in the threading of the penetrator (2).
  4. A device according to Claim 3, characterised in that the locking means comprise a force fitting of the peg (6) in its bore (7).
  5. A device according to Claim 1, characterised in that the obstacle is a longitudinal key (13) and in that this key comes into contact with the penetrator (2) at the level of a corresponding longitudinal indentation (15) made in the threading of the penetrator (2).
  6. A device according to one of Claims 3 to 5, characterised in that it associates an obstacle (6,13) to at least three housings (14,16) made on the sabot (1) and at least four indentations (15,17) made on the penetrator (2).
  7. A device according to Claim 2, characterised in that the bore (7) opens out at the level of the top of a tooth of the rifling of the sabot (1) and has a diametre less than the width of this tooth top.
  8. A device according to Claim 7, characterised in that the peg (6) is made of a malleable material chosen so that it yields and becomes encrusted between the threading of the penetrator and the sabot to either side of the bore (7) during positioning of the peg (6), thus constituting the locking means.
  9. A device according to Claim 8, characterised in the the malleable material is chosen from the following materials : annealed copper, medium-hard iron, polyamide, lead, tin.
  10. A device according to one of Claims 1 to 9, characterised in that the housing (7,14,16) is arranged at the level of a separation face between two segments of the sabot (1), and is roughly symmetrical to this face.
EP91402229A 1990-08-13 1991-08-12 Rotational motion prevention device between an arrow-type projectile and its support Expired - Lifetime EP0471616B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR909010287A FR2665765B1 (en) 1990-08-13 1990-08-13 DEVICE FOR ROTATING STOP BETWEEN A BAR AND A SHOE.
FR9010287 1990-08-13

Publications (2)

Publication Number Publication Date
EP0471616A1 EP0471616A1 (en) 1992-02-19
EP0471616B1 true EP0471616B1 (en) 1995-12-06

Family

ID=9399637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402229A Expired - Lifetime EP0471616B1 (en) 1990-08-13 1991-08-12 Rotational motion prevention device between an arrow-type projectile and its support

Country Status (9)

Country Link
US (1) US5138951A (en)
EP (1) EP0471616B1 (en)
JP (1) JPH06341795A (en)
AT (1) ATE131282T1 (en)
DE (1) DE69115167T2 (en)
ES (1) ES2082166T3 (en)
FR (1) FR2665765B1 (en)
IL (1) IL99111A (en)
NO (1) NO175075B (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE19608456C2 (en) * 1996-03-05 2000-07-20 Rheinmetall W & M Gmbh Sabot projectile

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US5413049A (en) * 1993-07-13 1995-05-09 Pacific Armatechnica Corporation Reduction of velocity decay of fin stabilized subcaliber projectiles
US5479861A (en) * 1994-01-03 1996-01-02 Kinchin; Anthony E. Projectile with sabot
US7665395B2 (en) * 2006-01-30 2010-02-23 Agency For Defense Development Lateral support device system for canister-launched missile
DE102007037700A1 (en) * 2007-08-09 2009-02-12 Rheinmetall Waffe Munition Gmbh Driving or guiding cage and method for fixing such cages
DE102007037738A1 (en) 2007-08-09 2009-02-12 Rheinmetall Waffe Munition Gmbh Projectile with a guide cage and pusher plate with acceleration-optimized opening
FR2948185A1 (en) * 2009-07-20 2011-01-21 Nexter Munitions DEVICE FOR CONNECTING CONCORDANCE OF SHAPE BETWEEN A SHOE AND A BAR OF A PROJECTILE

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CH516134A (en) * 1969-03-17 1971-11-30 Brevets Aero Mecaniques Subcalibrated core shells
US3695181A (en) * 1970-03-12 1972-10-03 Space Res Corp Sub-caliber projectile
IL37042A (en) * 1971-06-14 1976-06-30 Israel State Rear sabot for sub-calibre projectile with delayed detachment
DE2323244C3 (en) * 1973-05-09 1979-04-19 Rheinmetall Gmbh, 4000 Duesseldorf Wing-stabilized sub-caliber bullet
US4735148A (en) * 1986-03-18 1988-04-05 United Technologies Corporation Plastic composite sabot
EP0255570B1 (en) * 1986-07-07 1990-05-23 Werkzeugmaschinenfabrik Oerlikon-Bührle AG Sabot projectile, especially an arrow-type projectile
US4802415A (en) * 1987-12-28 1989-02-07 Ford Aerospace Corporation Telescoped ammunition round having subcaliber projectile sabot with integral piston

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19608456C2 (en) * 1996-03-05 2000-07-20 Rheinmetall W & M Gmbh Sabot projectile

Also Published As

Publication number Publication date
IL99111A0 (en) 1992-07-15
EP0471616A1 (en) 1992-02-19
IL99111A (en) 1994-08-26
ES2082166T3 (en) 1996-03-16
DE69115167T2 (en) 1996-05-30
US5138951A (en) 1992-08-18
NO175075B (en) 1994-05-16
FR2665765B1 (en) 1994-09-16
FR2665765A1 (en) 1992-02-14
NO913134L (en) 1992-02-14
JPH06341795A (en) 1994-12-13
NO913134D0 (en) 1991-08-12
DE69115167D1 (en) 1996-01-18
NO175075C (en) 1994-08-24
ATE131282T1 (en) 1995-12-15

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