EP2905572B1 - Douille de charge propulsive pour munition encartouchée - Google Patents

Douille de charge propulsive pour munition encartouchée Download PDF

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Publication number
EP2905572B1
EP2905572B1 EP15000230.1A EP15000230A EP2905572B1 EP 2905572 B1 EP2905572 B1 EP 2905572B1 EP 15000230 A EP15000230 A EP 15000230A EP 2905572 B1 EP2905572 B1 EP 2905572B1
Authority
EP
European Patent Office
Prior art keywords
propellant
pressure plate
securing
securing element
ring
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.)
Active
Application number
EP15000230.1A
Other languages
German (de)
English (en)
Other versions
EP2905572A1 (fr
Inventor
Michael Biedermann
Helmut Hammer
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.)
Diehl Defence GmbH and Co KG
Original Assignee
Diehl Defence GmbH and Co KG
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Diehl Defence GmbH and Co KG filed Critical Diehl Defence GmbH and Co KG
Priority to PL15000230T priority Critical patent/PL2905572T3/pl
Publication of EP2905572A1 publication Critical patent/EP2905572A1/fr
Application granted granted Critical
Publication of EP2905572B1 publication Critical patent/EP2905572B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
    • F42B39/20—Packages or ammunition having valves for pressure-equalising; Packages or ammunition having plugs for pressure release, e.g. meltable ; Blow-out panels; Venting arrangements

Definitions

  • the invention relates to a propellant charge case for a cartridge ammunition, comprising a sleeve housing with a high-pressure chamber for receiving a propellant charge and a low-pressure chamber communicating with the high-pressure chamber when the propellant is ignited, such as, for example WO2012 / 126554 A described.
  • a cartridge ammunition which has a propellant charge sleeve of the type described.
  • the propellant charge tube has a high pressure chamber containing a pyrotechnic propellant charge.
  • the high-pressure chamber is downstream of a low pressure chamber in the direction of the floor, which communicates via overflow openings with the high pressure chamber.
  • Such a two-stage propellant has the problem that the ammunition explodes when exposed to a fire or other higher temperatures above the ignition temperature of the propellant charge.
  • a safety mechanism which allows a targeted ventilation in order to allow a pressure reduction in the case of a thermally initiated burnup of the propellant charge.
  • Such ammunition is called insensitive ammunition.
  • two-stage propellant charge sleeve with high-pressure and low-pressure chamber is provided as a securing mechanism, a fusible retaining ring on the in the mounting position, a pressure plate in which Primer is received, is fixed to the bottom of the case. Between the pressure plate and the sleeve bottom an outwardly leading annular channel is provided. If there is a corresponding thermal load, for example due to a fire or the like, the circlip, whose melting temperature is below the ignition temperature of the ignition charge of the primer cap or of the propellant charge, melts.
  • the melt material should flow away through the annular channel, so that the pressure plate is released and loses the mechanical support to the propellant charge sleeve. Even if it now comes to a further thermal load and the propellant burns off, there is no explosion, since in the case of burning a pressure reduction on the falling of the propellant charge pressure plate and thus the then given larger opening in the sleeve bottom is possible.
  • the safety function is based here on a melting of the retaining ring. For a corresponding mechanical decoupling of the pressure plate, it is necessary that the securing ring ultimately completely melts. This may not always be the case, depending on the temperature or temperature distribution. In addition, there may be blockages within the narrow annular channel, so that sometimes an outflow of the melt material is not guaranteed or it can lead to jamming.
  • the invention is therefore based on the problem to provide a propellant charge sleeve, the functionally reliable allows a thermally induced opening to allow ventilation.
  • a propellant charge for a cartridge ammunition according to claim 1.
  • one or more radially movable retaining elements are provided which support the pressure plate on a support plate in is suitably fixed to the sleeve bottom of the sleeve housing, or axially fixed to the sleeve bottom itself.
  • the one or more holding elements are suitably coupled to the securing element.
  • the fuse element is thermally activated as described, so it is able to allow in case of a temperature increase in any way a radial mobility of the fuse or elements from its fixing position. This means that the axial fixation of the pressure plate is actively mechanically released, so that it is ensured that the pressure plate is actually released in this case and the ventilation can take place.
  • the fuse element will change its shape during a thermal activation, that is to say consist of a memory material which, on reaching a transition temperature, changes from a first to a second form. Consequently, it is ensured that the one or more securing elements are moved directly radially due to this thermal activation, so that they are radially movable and in principle the axial fixation of the printing plate is repealed.
  • the securing element is preferably designed as a circumferential securing ring, so for example either as a circumferential melt ring or as a circumferential memory metal ring.
  • a circumferential collar or a circumferential groove under or into which engage the one or more holding elements in the fixing position. Consequently, as long as the one or more holding elements in the radially inner position engage under the collar or engage in the groove, a secure fixation of the pressure plate is given.
  • the securing mechanism according to the invention can be configured in different ways.
  • the holding elements with the shape-changing fuse element so for example the securing ring, such coupled movement, that the one or more holding elements are moved radially in a change in shape of the securing element from the fixing position.
  • corresponding groove-shaped receptacles are preferably provided on the holding element or elements in which the securing element is accommodated.
  • a corresponding groove-shaped receptacle is provided on each of these retaining elements the fuse element, so here the locking ring, runs or in which it is added. If it then comes to a thermally activated change in shape, in this case to an increase in the diameter of the locking ring, this inevitably takes with the holding elements, so they are moved radially outward, over which the mechanical axial securing is released. It is also conceivable to form on the one or more holding elements on the side facing the pressure plate an inclined surface, wherein the pressure plate has a complementary inclined surface. In the securing position, the corresponding inclined surfaces abut each other. In the case of thermal activation in this case, a slightly lighter radial movement is possible, as with axially adjacent surfaces between the holding elements and pressure plate.
  • a screwed to the sleeve housing or the support plate threaded ring is expediently provided which fixes the securing element axially, wherein but at the same time also that or the holding elements are determined according to axially.
  • the invention further relates to a cartridge ammunition comprising a propellant charge case of the type described.
  • Fig. 1 shows a sectional view through a not belonging to the invention cartridge ammunition 1, for example by a 40 mm cartridge.
  • the cartridge ammunition 1 consists of a propellant charge tube 2 according to the invention with a sleeve housing 3, which is connected to the actual projectile 4 in the region of the floor 5.
  • a propellant charge unit 6 is provided, which received a high pressure chamber 7, in which a propellant charge not shown here is, has.
  • This high-pressure chamber 7 is defined or delimited via an insert 8, which is closed on the bottom side via a plate arrangement 9 comprising a ventilation unit 10.
  • the high-pressure chamber 7 communicates via bores 11 with a low-pressure chamber 12, on which the bullet bottom 5 adjoins.
  • the basic structure of such a two-stage propellant charge unit 6 is well known.
  • the Afubau is the propellant charge shell 2 in view of the configuration of the plate unit 9 and the ventilation unit 10.
  • This ventilation unit 10 allows the propellant charge case 2 and the high-pressure chamber 7 thermally induced to open, thus giving a ventilation option, if there is a risk that it comes due to the prevailing ambient temperature to a burnup of the propellant charge in the high-pressure chamber 7.
  • different embodiments of the plate assembly 9 and the ventilation unit 10 are provided in the FIGS. 2 to 9 are shown in more detail.
  • Fig. 2 shows a not belonging to the invention embodiment of a plate assembly 9, which closes the high pressure chamber 7 and ultimately forms the bottom of the sleeve housing 3.
  • the plate assembly 9 comprises a support plate 13 having an external thread 14, with which they, see Fig. 1 , in an internal thread 15 of the insert 8, which in turn is screwed via a threaded connection 16 in the sleeve housing, is screwed.
  • the support plate 13 is made of metal.
  • a metal pressure plate 17 is arranged, which is received in a corresponding receptacle 18 of the support plate 13 and basically axially movable relative to the pressure plate 13, that is along the longitudinal axis of the cartridge ammunition 1 and the propellant charge sleeve 2 is movable.
  • the pressure plate 17 has a receptacle 19 for a primer 20, via which the defined ignition takes place for a defined firing of the projectile 4. Via a bore 21, the primer 20 communicates with the high-pressure chamber 7 and thus with the propellant, which is also ignited upon ignition of the primer.
  • a ventilation unit 10 is provided, part of which is ultimately the support plate 13 and the pressure plate 17.
  • the pressure plate 17 is basically axially movable relative to the support plate 13. In the basic position, the pressure plate 17 via a securing element 22, here a locking ring 23, axially secured. This circlip 23 is fixed via a threaded ring 24, which is screwed via a threaded connection 33 in the support plate 13, so it can not fall out axially.
  • the securing ring 23 is a metal ring made of a memory metal. Depending on the temperature, this retaining ring can assume two defined shapes, namely, on the one hand, a smaller first shape, as in FIG Fig. 2 shown, as well as a larger diameter second shape, as in Fig. 3 shown. Increases the temperature to which the locking ring 23 is exposed above a certain transition temperature, it is as a result of a structural change of the memory or shape memory metal, the change in shape, that is, the retaining ring 23 of the first, having the smaller diameter shape in the second, larger diameter shape passes. In the starting position according to Fig.
  • the circlip 23 has an annular, annular retaining element 26 forming inner edge, with which he engages under the circlip 25. Because of this undercut on this retaining element annular edge 26 and the fact that the locking ring 23 is axially fixed on the threaded ring 24, consequently, the pressure plate 17 is fixed.
  • the retaining ring 23 changes its shape, see Fig. 3 he opens up. In this case, the retaining element annular edge 26 no longer engages under the annular collar 25 of the pressure plate 17.
  • the locking ring 23 due to the fixation on the threaded ring 24 despite its radial expansion (which is possible after radially in the support plate 13 is still some room that he can increase in diameter) still fixed, but is due to this radial expansion the axial fixation of the pressure plate 17 is no longer given.
  • the pressure plate 17 If, in the event of a fire, the temperature also rises above the ignition temperature of the propellant charge and burns off, the pressure plate 17 is pushed out axially by the pressure forming in the high-pressure chamber 7 Thus, it leaves its seat in the support plate 13. This inevitably leads to an opening of the high-pressure chamber 7, it forms a large, free discharge cross-section, through which the pressure can escape.
  • the connection between the propellant charge case 2 and projectile 1 remains here, also the insert 8 or a rupture disc in the high-pressure chamber 7 remains undamaged.
  • FIGS. 4 to 7 An inventive embodiment of a propellant charge sleeve or a plate assembly 9 with ventilation unit 10 is in the FIGS. 4 to 7 shown.
  • the Figures 5 and 7 show respective bottom views of the arrangements of the FIGS. 4 and 6 , for reasons of clarity in the Figures 5 and 7 each of the threaded ring 24 is not shown.
  • this plate assembly 9 consisting of support plate 13 and pressure plate 17 and their arrangement in a corresponding carrier plate-side recording, etc., insofar as corresponds to the Figures 2 and 3 described.
  • ring segments forming holding elements 27 are provided, which in the basic position, see Fig. 4 , in turn engage under an annular collar 25 of the pressure plate 17.
  • the holding elements 27 are in turn axially fixed by means of a threaded ring 24, which is screwed into the carrier plate 13 via a corresponding threaded connection 33.
  • a securing element 22 in the form of a securing ring 23 made of a memory metal or a shape memory alloy is provided.
  • This securing ring 23 is inserted in circumferential grooves 28 which are formed on the holding elements 27. He is also axially fixed over the threaded ring 24.
  • FIGS. 2 to 7 show in each case embodiments of plate assemblies respectively ventilation units, in which the thermally induced active mechanical solution of the pressure plate 17 from the support plate 13 via a securing element respectively a securing ring 23 of a memory metal vonstatten.
  • This memory metal may be, for example, a nickel-titanium alloy, which is also known under the name "Nitinol”.
  • Nitinol nickel-titanium alloy
  • other memory metals or shape memory alloys can be used as long as their transformation or transformation temperature is in a range below the ignition temperature of the primer or the propellant charge.
  • the securing element respectively the retaining ring of a memory metal, which has a one-way effect, thus therefore a one-time change in shape in one direction when the transition temperature is exceeded and no longer deformed upon cooling to its original shape.
  • the given mechanical opening would be obtained, this circumstance being of course indicated by appropriate measures, which are visible on the plate assembly 9, ie at the bottom of the propellant charge sleeve, so that the user can see immediately that this ammunition can not be fired.
  • a memory metal exhibiting a two-way effect could also be used.
  • FIGS. 5 and 7 show a possibility of such optical identification when using a one-way effect pointing memory metal.
  • the threaded ring 24 is not shown.
  • the bottom view according to Fig. 5 can be seen, are the four retaining elements 27 in the original form close together, so form a closed ring. This ultimately shows that the axial fixation is intact.
  • FIG. 7 shown bottom view clearly shows that the four retaining elements 27 have been moved radially outward. They do not abut each other, but rather free spaces 32 have been created between them, which - if, in spite of cooling without ignition of the propellant charge, this shape of the securing ring 23 is preserved - visually indicate that the axial fixation is no longer present.
  • FIGS. 8 and 9 show a further, not belonging to the invention embodiment of a plate assembly 9 and a ventilation unit 10, in turn comprising a support plate 13 and a pressure plate 17 inserted into this.
  • the pressure plate 17 here also has an annular collar 25, which, however, has an inclined surface 29.
  • Provided here are several, for example, four in turn complementary to a ring shape holding elements 27, in the starting position, see Fig. 8 , engage under the annular collar 25 and also have on their inside corresponding oblique surfaces 30, so that there is a surface contact with the inclined surface 29 of the annular collar 25, so a conical surface arrangement.
  • the retaining elements 27 radially encompassing in turn a securing element 22 is provided in the form of a securing ring 23, which is here, however, formed of a fusible material.
  • This securing ring 23 has a melting temperature which is below the ignition temperature of the primer cap or the propellant charge. He is, as well as the holding elements 27, in turn, via a threaded ring 24 which is screwed via a threaded connection in the support plate 13, axially fixed.
  • the threaded ring 24 has a plurality of sufficiently sized apertures 31, through which, in the case of melting of the locking ring 23, the melt material can flow. If there is sufficient space radially to the securing ring 23, into which the melt can be pressed, such openings 31 are not necessary.
  • the melt ring 23 consists of a low-melting metal alloy, which is designed with respect to the melting point so that it is below the ignition temperature of the primer respectively the propellant charge.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Fuses (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Claims (7)

  1. Douille de charge propulsive pour munition à cartouche, comprenant un boîtier de douille (3) dotée d'une chambre à haute pression (7) destinée à accueillir une charge propulsive et d'une chambre à basse pression (12) qui communique avec la chambre à haute pression (7) lors de l'allumage de la charge propulsive, ainsi qu'une plaque d'appui (17) destinée à accueillir une amorce (20), la plaque d'appui (17) étant disposée sur le boîtier de douille (3) ou une plaque porteuse (13) détachable par le biais d'un élément de sécurité (22, 23) actionnable thermiquement, et un ou plusieurs éléments de maintien (26, 27) qui immobilisent la plaque d'appui (17) dans le sens axial étant présents, caractérisée en ce que les éléments de maintien (26, 27) peuvent se déplacer dans le sens radial depuis leur position d'immobilisation lors d'un actionnement activé thermiquement de l'élément de sécurité (22, 23),
    en ce que l'élément de sécurité (22, 23), en cas d'activation thermique, modifie sa forme sans modifier son état d'agrégation, et
    en ce que le ou les éléments de maintien (26, 27) est/sont couplés en mobilité avec l'élément de sécurité (22, 23) modifiant sa forme de telle sorte que le ou les éléments de maintien (26, 27) est/sont déplacé(s) dans le sens radial depuis la position d'immobilisation par le changement de forme de l'élément de sécurité (22, 23).
  2. Douille de charge propulsive selon la revendication 1, l'élément de sécurité (22) étant une bague de sécurité (23).
  3. Douille de charge propulsive selon la revendication 1 ou 2, le ou les éléments de maintien (27) possédant un logement (28) en forme de rainure dans lequel est accueilli l'élément de sécurité (22, 23).
  4. Douille de charge propulsive selon l'une des revendications précédentes, le ou les éléments de maintien (27) possédant sur le côté dirigé vers la plaque d'appui (17) une surface inclinée et la plaque d'appui (17) possédant une surface inclinée complémentaire.
  5. Douille de charge propulsive selon la revendication 4, le ou les éléments de maintien (27) et la plaque d'appui (17) possédant des surfaces inclinées (29, 30) mutuellement complémentaires reposant l'une contre l'autre.
  6. Douille de charge propulsive selon l'une des revendications précédentes, une bague filetée (24) qui immobilise l'élément de sécurité (22, 23) dans le sens axial étant vissée sur le boîtier de douille (3) ou la plaque porteuse (13).
  7. Munition à cartouche, comprenant une douille de charge propulsive (2) selon l'une des revendications précédentes.
EP15000230.1A 2014-02-06 2015-01-27 Douille de charge propulsive pour munition encartouchée Active EP2905572B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15000230T PL2905572T3 (pl) 2014-02-06 2015-01-27 Łuska ładunku miotającego do amunicji zespolonej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014001576.9A DE102014001576A1 (de) 2014-02-06 2014-02-06 Treibladungshülse für eine Patronenmunition

Publications (2)

Publication Number Publication Date
EP2905572A1 EP2905572A1 (fr) 2015-08-12
EP2905572B1 true EP2905572B1 (fr) 2017-07-19

Family

ID=52440523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15000230.1A Active EP2905572B1 (fr) 2014-02-06 2015-01-27 Douille de charge propulsive pour munition encartouchée

Country Status (8)

Country Link
EP (1) EP2905572B1 (fr)
AU (1) AU2015200542B2 (fr)
DE (1) DE102014001576A1 (fr)
IL (1) IL236493B (fr)
NO (1) NO3130882T3 (fr)
PL (1) PL2905572T3 (fr)
SG (1) SG10201500509QA (fr)
ZA (1) ZA201500798B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180135953A1 (en) * 2016-11-15 2018-05-17 Nostromo Holdings, Llc Ammunition cartridge with a base plug vent

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155298A (en) * 1991-09-30 1992-10-13 The United States Of America As Represented By The Secretary Of The Navy Thermally activated case venting safety apparatus
FR2686410A1 (fr) * 1992-01-22 1993-07-23 France Etat Armement Dispositif assurant le deconfinement d'une charge contenant un explosif par mise en óoeuvre d'un element deformable en materiau a memoire de forme.
US6752085B2 (en) * 2002-05-06 2004-06-22 Lockheed Martin Corporation Method and apparatus for releasably attaching a closure plate to a casing
DK2335010T3 (en) * 2008-10-10 2017-03-27 Saab Ab CARTRIDGE AND A CHARGE INCLUDING SUCH A CARTRIDGE
EP2335011B1 (fr) * 2008-10-10 2017-03-29 Saab AB Douille et cartouche comprenant ladite douille
US8925463B1 (en) * 2009-09-03 2015-01-06 Kms Consulting, Llc Pressure relief system for gun fired cannon cartridges
BR112012004547A2 (pt) * 2009-09-03 2020-08-25 Kms Consulting Llc. "munição de cartucho"
DE102011014402A1 (de) 2011-03-18 2012-09-20 Rheinmetall Waffe Munition Gmbh Insensitive Munition

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
AU2015200542B2 (en) 2019-03-14
IL236493A0 (en) 2015-04-30
DE102014001576A1 (de) 2015-08-06
SG10201500509QA (en) 2015-09-29
NO3130882T3 (fr) 2018-04-07
EP2905572A1 (fr) 2015-08-12
IL236493B (en) 2019-11-28
PL2905572T3 (pl) 2017-12-29
ZA201500798B (en) 2016-01-27
AU2015200542A1 (en) 2015-08-20

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