EP1549901A1 - Ceinture d'etancheite pour projectile et munition equipee d'une telle ceinture - Google Patents
Ceinture d'etancheite pour projectile et munition equipee d'une telle ceintureInfo
- Publication number
- EP1549901A1 EP1549901A1 EP03787838A EP03787838A EP1549901A1 EP 1549901 A1 EP1549901 A1 EP 1549901A1 EP 03787838 A EP03787838 A EP 03787838A EP 03787838 A EP03787838 A EP 03787838A EP 1549901 A1 EP1549901 A1 EP 1549901A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- belt
- projectile
- sub
- skirt
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
- F42B14/02—Driving bands; Rotating bands
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
- F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
- F42B14/061—Sabots for long rod fin stabilised kinetic energy projectiles, i.e. multisegment sabots attached midway on the projectile
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
- F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
- F42B14/067—Sealing aspects in sabots, e.g. sealing between individual segments of the sabots or sealing between the outer surface of the sabot and the inner surface of the barrel
Definitions
- the technical field of the invention is that of sealing belts for projectiles and in particular for undersized projectiles.
- projectile belts The purpose of projectile belts is to ensure, when firing, a seal against propellant gases between the wall of the barrel of the weapon and the projectile. These belts are usually arranged in a peripheral groove of the projectile and, in order to be able to ensure such a seal, they are always slightly supercalibrated (by about 10%).
- a first problem encountered with known belts is that of the effectiveness of the seal provided during firing in worn tubes. Overcalibration is not always enough to prevent leakage of peripheral gases, which reduces the speed of the projectile, impairs its effectiveness and accelerates tube wear.
- the under-calibrated projectiles comprise an under-calibrated bar maintained by a sabot with the caliber.
- the sabot is formed of several segments (generally three) and it releases the bar at the exit of the barrel of the weapon.
- the shoe usually carries a sealing belt which is arranged in a groove arranged at the level of a part of the size of the shoe, part usually called "push plate” since it is at this level that the pressure is exerted. propellant gases.
- Patent EP307307 thus describes a sealing belt comprising a rear skirt connected to the ' socket and which makes it possible to ensure, when firing, a low pressure seal (pressure of the order of a few Mega Pascals) and a front bead housed in a throat of the projectile and ensuring, like a classic belt, high pressure sealing (pressure of the order of several hundred Mega Pascals).
- Low pressure tightness is essential in the first tenths of milliseconds following the ignition of the propellant charge contained by the combustible case. Indeed, the confinement provided by such a socket is less than that obtained with a metal socket and the movement of the projectile occurs for a lower pressure. A gasket insufficiently sensitive to be operational upon ignition may allow gas to pass to the front of the projectile, which would reduce the efficiency of the. propellant charge.
- the sleeve is fixed at the level of the skirt, fixed to the belt generally by riveting.
- the defensive publication US-H-1353 describes such a projectile which has the advantage of having a lightened hoof and of allowing the carrying of a greater quantity of propellant powder in the case.
- the belt according to the invention makes it possible to ensure a good quality seal even inside worn tubes, while being easy to mount on the projectile.
- the belt according to the invention also allows the production of sub-calibrated projectiles of the towed type, therefore with a lightened shoe, while nevertheless ensuring an excellent level of tightness and without creating difficulties from the point of view of the placing of the projectile.
- the subject of the invention is a sealing belt for a projectile, a belt characterized in that it comprises a front sub-belt comprising at least two sectors, sub-belt having at least one conical profile cooperating with a complementary profile d 'A groove of the projectile, the top of the cone being disposed on the side of a rear part of the projectile, sub-belt which is held on the projectile by a cylindrical skirt.
- the skirt may include on its internal surface a means allowing it to be joined to the under-belt.
- the skirt may also include a circular internal collar receiving the sectors of the sub-belt.
- the belt may include a layer of sealing material disposed at the rear of the sub-belt or of the internal collar of the skirt.
- the skirt may have a length of between 50% and
- each sector of the sub-belt may include at each of its lateral edges at least one indentation intended to cooperate with a complementary indentation of a neighboring sector so as to constitute a propane gas tightness baffle.
- a flexible sealing material will advantageously be placed in the baffles and at a rear face of the sub-belt.
- the sealing belt may be sub-calibrated at least at the level of a front part.
- the subject of the invention is also a sub-calibrated projectile equipped with such a belt, a projectile comprising a shoe of the towed type and having improved guiding characteristics in the tube as well as sealing characteristics.
- the arrow projectile comprises an under-calibrated bar maintained by a shoe with the caliber formed by at least two segments, this projectile carries a belt comprising a sub-belt and it is characterized in that the shoe comprises a plate thrust which is located axially in front of a transverse plane passing through the center of gravity of the complete projectile, thrust plate comprising at least one groove receiving the sub-belt.
- baffles separating the different sectors of the sub-belt may advantageously be arranged alternately with the joint planes separating the shoe segments.
- Each shoe segment may include a rear caliber guide stud.
- Each shoe segment may have a reinforcing rib extending longitudinally behind the push plate.
- the rib may be in contact with the skirt of the belt.
- the skirt of the belt may then have internal longitudinal grooves in which the ribs are housed.
- the skirt of the belt may be over-calibrated at the level of a rear part.
- the invention finally relates to a munition incorporating such a projectile.
- This ammunition comprises a case containing a propellant charge and incorporating a projectile, it is characterized in that the skirt of the belt is secured to a connecting ring fixed to the case. Part of the propellant charge can then be placed in the waist skirt.
- FIG. 1b is an enlarged view of the sub-belt and of its attachment to the shoe
- FIG. 2 is a cross-sectional view of this cut projectile produced along the plane, the trace AA of which is identified in FIG. 1,
- FIG. 3 is a detailed view of the belt, skirt removed, showing the indentations made at the lateral edges of two sectors of the sub-belt,
- FIG. 4 shows an alternative embodiment of the belt
- Figure 5 shows in longitudinal section a first embodiment of a projectile and ammunition according to the invention, the projectile being shown stationed in a tube d weapon
- FIG. 6 shows in longitudinal section a second embodiment of a projectile and of ammunition according to the invention
- a projectile 1 which is here a sub-calibrated projectile stabilized by empennage (or arrow projectile) comprises a shoe 3 formed of at least two segments (here three segments) surrounding a bar 4.
- the projectile 1 is made integral with a combustible case 2 by means of a connecting ring 5.
- connection ring 5 has a flared rear part 6 which is made integral with the combustible socket 2 by an appropriate connection means, for example by rivets 7 regularly distributed angularly and / or by bonding.
- the connecting ring 5 has a front part 8 which is made integral with the projectile 1 at the level of a belt 9 for example by rivets 10 regularly distributed angularly.
- the sealing belt 9 comprises a front sub-belt 11 comprising at least two sectors (here it comprises three sectors 11a, 11b and 11e see FIG. 2), and which is held on the projectile 1 by a cylindrical skirt 12.
- the skirt preferably has a length of between 50% and 80% of the caliber, that is to say from 60 to 100mm for a projectile of 120mm caliber. Such a length is substantially double that of conventional belts.
- the sub-belt 11 has two conical profiles 13a,
- the skirt 12 has on its internal surface a means ensuring its connection with the sub-belt.
- This means consists here of circular teeth 15 which cooperate with complementary grooves arranged on the external cylindrical surface of the sub-belt 11. Any other means of attachment would of course be possible, for example a thread.
- each sector 11a, 11b, link of the sub-belt 11 has at each of its lateral edges at least one indentation 16 which is intended to cooperate with a complementary indentation 17 of a neighboring sector so as to constitute a baffle 18 ensuring sealing against propellant gases.
- a clearance is provided at each indentation between the two sectors, this clearance is filled with a flexible sealing material 19, for example silicone.
- indentations represented here have the form of tongues cooperating with slots. It would be possible to make indentations of different shapes, for example teeth or else curved shapes.
- the baffles 18 separating the different sectors 11a, 11b and lie of the sub-belt 11 are arranged alternately with the joint planes 22 separating the segments 3a, 3b and 3c of the shoe 3.
- a the purpose of such an arrangement is to improve the seal by avoiding points of weakness which can promote the passage of gases in the joint plane.
- a flexible material 20 such as a silicone resin, is also placed at the level of a bowl 21 arranged on the rear face of the sub-belt 11 (see FIG. 1b).
- the mounting of the belt is facilitated by its subdivision into a sub-belt 11 and a skirt 12.
- the massive sectors of the sub-belt are easily put in place without it being necessary to deform them.
- the silicone seals are removed and ensure a temporary attachment of the belt and the projectile.
- the thin skirt 12 is then slid around the projectile and realizes the complete joining of the different parts of the belt.
- the skirt can easily be put in place without prior expansion.
- the assembly therefore takes place completely cold, which is more economical and ensures better reproducibility of the mechanical characteristics of the belt.
- the functioning of this belt is as follows. During the firing of the projectile, the gas pressure is exerted radially inside the skirt 12 and has the effect of pressing it on the internal surface of the barrel of the weapon. The rivets 10 break and the projectile separates from the case 2 and from the connection ring 5.
- the gas pressure also pushes the belt 11 axially which, thanks to the conical profiles 13 and 14, departs radially from the shoe 3 and comes to press against the wall of the tube.
- the division of the sub-belt 11 into three sectors promotes this separation.
- the skirt 12 is sufficiently thin (of the order of a millimeter) and flexible to allow the sectors of the sub-belt 11 to be separated.
- the seal is improved on the one hand with the subdivision of the belt into three mobile sectors and on the other hand thanks to the skirt which is applied to the internal wall of the tube over a large surface.
- the skirt thus makes it possible to cover the defects in the coating of the barrel of the weapon (chrome plating) and limits the gas leaks at these locations.
- the belt skirt also makes it possible to protect the wall of the tube by avoiding the impact of the flames of the propellant charge which have the drawback of increasing the ripping.
- An annular fracture initiator will then be provided at the change in diameter (at the rivets 10 in FIG. ensure the reproducibility of the separation between the skirt part ensuring the tightness in the tube and the flared part ensuring the connection with the sleeve.
- Figure 4 shows an alternative embodiment of the belt according to the invention.
- the skirt 12 comprises a circular internal collar 35 which receives the sectors of the sub-belt 11. The three sectors are therefore in abutment against the collar 35 and they are also immobilized by the circular teeth 15.
- the mounting on the shoe is carried out in the same way as for the previous embodiment.
- the belt according to the invention has been described here adapted on an under calibrated projectile. It is of course possible to place it on a caliber projectile.
- the belt according to the invention is nevertheless particularly suitable for equipping an arrow projectile of the towed shoe type.
- the belt 9 can be sub-calibrated at its front part 9a. Such a sub-calibration will be of the order of a few tenths of a mm, which is sufficient to facilitate the easy introduction of the projectile into the barrel of the weapon.
- the structural characteristics of the belt according to the invention allow the shot to catch the undersizing and thus ensure gas tightness.
- FIG. 5 thus shows a projectile 1 and an ammunition according to a first embodiment of the invention.
- This ammunition comprises, in addition to the projectile 1, a combustible case 2 closed at its rear part by an obturating base 23 which carries an igniter tube 24.
- the case contains a propellant charge (not shown here).
- the projectile 1 comprises a shoe 3 whose push plate PP (part comprising a groove receiving the sub-belt 11) is located axially in front of a median transverse plane PM which is the plane orthogonal to the bar 4 and passing through the center of gravity of the complete projectile.
- This shoe is of the towed type.
- the projectile 1 is introduced inside the barrel 25 of the weapon 26.
- the connecting ring 5 bears against the forcing cone 27 which connects the barrel 25 to the chamber 28
- the installation of the ammunition was made without difficulty thanks to the sub-calibration of the belt 9. Gas tightness will be ensured thanks to the structure of this belt.
- each segment of the shoe 3 also includes a rear stud 30 of the caliber. Such an arrangement improves the guidance of the projectile inside the barrel of the weapon.
- FIG. 6 and 7 show a projectile according to a second embodiment of the invention. This projectile differs from that according to FIG. 5 in that each segment 3a, 3b, 3c of the shoe 3 comprises a reinforcing rib 33 extending longitudinally behind the push plate PP.
- the ribs 33 make it possible to increase the transverse rigidity of the shoe 3.
- each rib 33 is in contact with the skirt 12 of the belt.
- the ribs 33 ensure the guidance of the projectile in the barrel of the weapon from the first moments of the shot.
- the skirt 12 of the belt has internal longitudinal grooves 34 in which the ribs 33 are housed. Such an arrangement makes it possible to weaken the skirt 12, which facilitates its rupture at the outlet from the barrel of the weapon. The mounting of the belt is also facilitated. In fact, the ribs 33 guide the skirt 12 which easily covers the sectors of the sub-belt 11.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0209505 | 2002-07-26 | ||
FR0209505A FR2842896B1 (fr) | 2002-07-26 | 2002-07-26 | Ceinture d'etancheite pour un projectile, projectile sous calibre et munition equipes d'une telle ceinture |
PCT/FR2003/001941 WO2004017015A1 (fr) | 2002-07-26 | 2003-06-24 | Ceinture d'etancheite pour projectile et munition equipee d’une telle ceinture |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1549901A1 true EP1549901A1 (fr) | 2005-07-06 |
EP1549901B1 EP1549901B1 (fr) | 2009-02-18 |
Family
ID=30011513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03787838A Expired - Lifetime EP1549901B1 (fr) | 2002-07-26 | 2003-06-24 | Ceinture d'etancheite pour projectile et munition equipee d'une telle ceinture |
Country Status (7)
Country | Link |
---|---|
US (1) | US7503262B2 (fr) |
EP (1) | EP1549901B1 (fr) |
AU (1) | AU2003260624A1 (fr) |
DE (1) | DE60326254D1 (fr) |
FR (1) | FR2842896B1 (fr) |
IL (1) | IL166406A (fr) |
WO (1) | WO2004017015A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2842896B1 (fr) * | 2002-07-26 | 2004-10-22 | Giat Ind Sa | Ceinture d'etancheite pour un projectile, projectile sous calibre et munition equipes d'une telle ceinture |
DE10320194A1 (de) * | 2003-05-07 | 2004-12-02 | Rheinmetall W & M Gmbh | Abwerfbarer Treibkäfig |
DE102009009776A1 (de) * | 2009-02-20 | 2010-08-26 | Rheinmetall Waffe Munition Gmbh | Patrone |
DE102009009772A1 (de) * | 2009-02-20 | 2010-09-02 | Rheinmetall Waffe Munition Gmbh | Verfahren zum Einbringen von Sollbruchstellen in ein ringförmiges Halte- und Dichtungsband eines Treibkäfiggeschosses und Laborierwerkzeug zur Durchführung des Verfahrens |
US8661984B2 (en) | 2011-06-22 | 2014-03-04 | The United States Of America As Represented By The Secretary Of The Army | Sabot |
KR102161848B1 (ko) * | 2012-06-07 | 2020-10-06 | 에어로바이론먼트, 인크. | 발사관 내에서 무인 항공기를 탈착가능하게 연결시키는 시스템 |
DE102015110627A1 (de) * | 2015-07-01 | 2017-01-05 | Rwm Schweiz Ag | Aus einem gezogenen Waffenrohr verschießbares, flügelstabilisiertes Unterkalibergeschoss und Verfahren zu seiner Herstellung |
GB2578572B (en) * | 2018-10-30 | 2022-08-17 | Bae Systems Plc | A sabot |
DE102019125128A1 (de) * | 2019-09-18 | 2021-03-18 | Rheinmetall Waffe Munition Gmbh | Treibkäfig |
USD1033290S1 (en) * | 2020-11-05 | 2024-07-02 | Affin As | Grip device for a vehicle wheel |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3738279A (en) * | 1970-07-24 | 1973-06-12 | Us Navy | Sabot for sub-calibre projectile |
US4187783A (en) * | 1978-03-13 | 1980-02-12 | The United States Of America As Represented By The Secretary Of The Army | Discarding sabot munition |
DE3033041C2 (de) * | 1980-09-03 | 1986-04-10 | L'Etat Français représenté par le Délégué Général pour l'Armement, Paris | Treibkäfig aus Metall und Kunststoff |
DE3037662A1 (de) * | 1980-10-04 | 1982-05-13 | Rheinmetall GmbH, 4000 Düsseldorf | Patronierte munition |
US4444113A (en) * | 1981-04-06 | 1984-04-24 | The United States Of America As Represented By The Secretary Of The Army | High-pressure self-sealing obturator in sabot discard projectile |
DE3525854A1 (de) * | 1985-07-19 | 1989-01-05 | Mauser Werke Oberndorf | Fluegelstabilisiertes pfeilgeschoss |
GB2241308B (en) * | 1986-02-20 | 1992-01-29 | Royal Ordnance Plc | Projectiles and components therefor |
FR2620214B1 (fr) | 1987-09-09 | 1990-04-13 | France Etat Armement | Bague de liaison entre un projectile et une douille |
FR2665761B1 (fr) * | 1990-08-13 | 1994-09-16 | Giat Ind Sa | Ceinture d'etancheite pour projectile fleche. |
US5359938A (en) * | 1990-10-24 | 1994-11-01 | Olin Corporation | Ultra light weight sabot |
USH1353H (en) | 1993-07-26 | 1994-09-06 | The United States Of America As Represented By The Secretary Of The Army | Velocity enhancing projectile sabot |
FR2801667B1 (fr) * | 1999-11-25 | 2002-01-18 | Giat Ind Sa | Dispositif de liaison entre une douille et un projectile et procede de montage d'une ceinture sur un projectile mettant en oeuvre un tel dispositif de liaison |
DE10157668B4 (de) * | 2001-11-24 | 2014-05-22 | Rheinmetall Waffe Munition Gmbh | Geschoss |
FR2842896B1 (fr) * | 2002-07-26 | 2004-10-22 | Giat Ind Sa | Ceinture d'etancheite pour un projectile, projectile sous calibre et munition equipes d'une telle ceinture |
FR2851038B1 (fr) * | 2003-02-10 | 2005-03-18 | Giat Ind Sa | Sabot pour projectile sous calibre |
DE10320194A1 (de) * | 2003-05-07 | 2004-12-02 | Rheinmetall W & M Gmbh | Abwerfbarer Treibkäfig |
-
2002
- 2002-07-26 FR FR0209505A patent/FR2842896B1/fr not_active Expired - Lifetime
-
2003
- 2003-06-24 US US10/522,414 patent/US7503262B2/en not_active Expired - Fee Related
- 2003-06-24 AU AU2003260624A patent/AU2003260624A1/en not_active Abandoned
- 2003-06-24 WO PCT/FR2003/001941 patent/WO2004017015A1/fr not_active Application Discontinuation
- 2003-06-24 DE DE60326254T patent/DE60326254D1/de not_active Expired - Lifetime
- 2003-06-24 EP EP03787838A patent/EP1549901B1/fr not_active Expired - Lifetime
-
2005
- 2005-01-20 IL IL166406A patent/IL166406A/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2004017015A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60326254D1 (de) | 2009-04-02 |
US20060032394A1 (en) | 2006-02-16 |
IL166406A0 (en) | 2006-01-15 |
EP1549901B1 (fr) | 2009-02-18 |
IL166406A (en) | 2012-05-31 |
WO2004017015A1 (fr) | 2004-02-26 |
US7503262B2 (en) | 2009-03-17 |
FR2842896A1 (fr) | 2004-01-30 |
FR2842896B1 (fr) | 2004-10-22 |
AU2003260624A1 (en) | 2004-03-03 |
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