EP1445573A1 - Treibkäfig für ein Unterkalibergeschoss - Google Patents

Treibkäfig für ein Unterkalibergeschoss Download PDF

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Publication number
EP1445573A1
EP1445573A1 EP03293350A EP03293350A EP1445573A1 EP 1445573 A1 EP1445573 A1 EP 1445573A1 EP 03293350 A EP03293350 A EP 03293350A EP 03293350 A EP03293350 A EP 03293350A EP 1445573 A1 EP1445573 A1 EP 1445573A1
Authority
EP
European Patent Office
Prior art keywords
insert
shoe
segment
shoe according
push plate
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.)
Withdrawn
Application number
EP03293350A
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English (en)
French (fr)
Inventor
Nicolas Eches
Jean-Paul Fauchon
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.)
Nexter Munitions SA
Original Assignee
Giat Industries SA
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.)
Filing date
Publication date
Application filed by Giat Industries SA filed Critical Giat Industries SA
Publication of EP1445573A1 publication Critical patent/EP1445573A1/de
Withdrawn legal-status Critical Current

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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
    • F42B14/06—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
    • F42B14/068—Sabots characterised by the material

Definitions

  • the technical field of the invention is that of hooves for under calibrated projectiles.
  • the under calibrated projectiles include an under-calibrated bar held by a hoof at caliber.
  • the shoe is formed of several segments (at least two and usually three) and it releases the bar to the out of the gun barrel.
  • the hoof usually wears a sealing belt which is arranged in a groove fitted at the level of a part of the shoe to the caliber, part usually called "push plate” since it is at level of this that the gas pressure exerts propulsion.
  • the shoe increases the speed of the bar under calibrated. However, it constitutes a dead mass which consumes some of the kinetic energy available and so it's desirable to reduce the hoof mass to increase the speed, therefore the performance of the bar.
  • Such bars have longitudinal inertias and important and must be firmly supported when fired by the front and rear parts of the hoof.
  • GB2251676 describes for example a shoe whose segments are made up laminar elements of fiber composite material oriented.
  • the shoe according to the invention is lightened while having mechanical performance adapted to shooting constraints a very elongated bar (L / D> 30).
  • This shoe is also simple to manufacture and relatively inexpensive compared to a whole hoof composite for example.
  • the subject of the invention is a shoe for a projectile comprising at least two segments intended for surround and train an under calibrated bar, shoe with a gauge push plate, shoe characterized in that it comprises a body made in one light material, body carrying at least one longitudinal insert made of a material with high mechanical characteristics, insert which has indentations cooperating with a profile external of the bar to allow the training of this one, indentations which extend those carried by the body of shoe and which also cooperate with the external profile of the bar.
  • the material of the insert (s) will preferably have a longitudinal elastic modulus greater than or equal to 100 Giga Pascals and an elastic limit greater than or equal to 900 Mega Pascals.
  • the material of the insert (s) can thus be chosen among the following materials: titanium or titanium alloy, steel, composite material.
  • the insert will thinner at the push plate than on the side and other of this one.
  • Each insert may extend on either side of the thrust plate, the body comprising at the level of the plate pushing at least two bearing surfaces for the insert, surfaces arranged on either side of the plate thrust.
  • the body of each segment may include a longitudinal recess made in its plane of symmetry and intended to receive an insert.
  • the recess may pass radially through the body of the segment on either side of the push plate.
  • the insert can be made integral with the segment body by at least two screws arranged in the vicinity of the ends front and back of the insert.
  • the body of each segment may include at least two recesses longitudinal each made at a joint plane intended to come into contact with another segment when the shoe is assembled, the inserts being thus positioned at the inter-segment joint planes of the shoe.
  • Each recess can then have a profile cooperating with a complementary profile carried by the insert.
  • each joint plane may carry two recesses: one disposed in front of the push plate and another arranged behind the push plate, each recess being intended to receive a separate insert.
  • the recesses arranged on the body of each segment may extend on either side of the thrust plate, the body comprising at the level of the plate pushing at least two bearing surfaces for the insert, surfaces arranged on either side of the plate thrust.
  • Each insert can be made integral with a body of segment by at least one screw arranged at the level of the plate of the segment considered.
  • an under calibrated projectile 1 (or arrow projectile) includes a shoe 2 surrounding a bar 3 carrying a tail 4. This projectile 1 is intended to be fixed to a fuel socket not shown.
  • the shoe typically comprises three segments 2a, 2b, 2c which are made integral with each other by a belt 5, which also ensures gas tightness propellants in the barrel of the weapon (not shown), and by two retaining rings 12 and 13, one at the front and the other at the back of the hoof (rings can possibly be omitted).
  • the segments are in contact with each other at joint plane level.
  • the bar carries a thread (or grooves) which cooperates with a thread (or grooves) complementary to the hoof. Such an arrangement allows to ensure the translational training of the bar by the shoe.
  • a silicone seal 6 is placed between the belt 5 and the rear part of the shoe 2.
  • the shoe 2 comprises a plate of thrust 7 to the caliber arranged substantially at the level of the center of gravity of the bar 3.
  • the shoe extends from side and on the other side of the push plate 7 by a rear part 8 and a front part 9.
  • the diameter of the front parts 9 and rear 8 is steadily decreasing between the plate thrust 7 and the front or rear end of the shoe 2.
  • the front part 9 of the shoe carries arms 10 to the caliber regularly distributed angularly. There is an arm by segment, so here three arms for the hoof.
  • These arms form a bearing ensuring the guiding of the front part of the hoof inside the barrel of a weapon.
  • the shoe comprises a body made of a light material, for example alloy aluminum, body with at least one insert longitudinal 11, made of a material with high mechanical characteristics.
  • Light material means density material less than 3.
  • the segment body is preferably made of an aluminum alloy or possibly in composite.
  • material with high characteristics mechanical a material having a modulus of elasticity longitudinal greater than or equal to 100 Giga Pascals and a elastic limit greater than or equal to 900 Mega Pascals.
  • titanium or a titanium alloy e.g. maraging steel
  • a composite material for example a material based on oriented carbon fibers
  • FIGS. 2a, 2b show the shoe 2 without the bar 3, the belt 5 and the rings 12 and 13.
  • each segment 2a, 2b or 2c of the shoe comprises a longitudinal recess 14 which is produced in its plane of symmetry 15a, 15b or 15c and which is intended to receive a insert 11 (see more particularly Figures 3a, 3b and 3c).
  • the recess 14 passes through the body of the segment on the on the other side of the push plate 7 (see Figures 2a, 2b and section 3b). Such an arrangement facilitates the machining of the recess 14 of the shoe.
  • Each insert 11 is in contact with the bar 3 and has indentations (not shown: for example a threads or circular grooves) which cooperate with a external profile of the bar 3 to allow the training of this one.
  • the body of shoe 2 also has indentations analogues (not shown) which extend those worn by the inserts 11 and which cooperate with the external profile of the bar.
  • each insert 11 of its shoe segment (here by screws 16 arranged at each end of the insert).
  • each insert has tabs 28 which are housed in additional clearances carried by the hoof body. These tabs carry the thread receiving the fixing screw 16 and they ensure radial retention of the insert by relation to the hoof.
  • the hybrid shoe according to the invention is thus formed of the assembly of an aluminum body (light material but low mechanical characteristics) with inserts in one generally denser material (titanium or steel) but with high mechanical characteristics.
  • the materials are distributed in the shoe according to their adequacy to the mechanical stresses they must undergo.
  • the most mechanically constrained hoof areas are the middle parts of the front 9 and rear 8 zones because they must resist the great efforts of inertia longitudinal and transverse generated by the bar 3. The thickness of these areas is reduced and the material of the insert is predominant in these areas.
  • the hoof push plate 7 is less constrained mechanically. There is therefore no need to works a very mechanically efficient material at the level of this push plate. However, this material must be light because the hoof volume is important at this level.
  • the material of the hoof body will therefore be preponderant push plate level
  • the insert 11 is therefore thinner at level of the thrust plate 7 (FIG. 3c) only from the side and on the other side of this one ( Figure 3b).
  • Such an arrangement allows also increase the aluminum surface (hoof body) which is in contact with the bar at the level of the push plate 7. This improves resistance to hoof body 2 shears in the hoof area where the shear stresses are the strongest.
  • the body of the shoe 2 comprises at the level of the push plate 7 two bearing surfaces 17 and 18 for the insert. These surfaces are arranged on either side of the push plate 7.
  • the front bearing surfaces 18 and rear 17 provide training by the shoe body 2 front and rear parts of the insert 11 which are applied the inertia forces of the bar.
  • the bearing surfaces 17 and 18 are flat and inclined relative to the axis 19 of the shoe.
  • the insert 11 has a length which is chosen in such a way that it only covers the most constrained areas mechanically of the front and rear parts. It is so no need to extend the insert to the front ends and rear of the hoof which are less mechanically stressed than the median zones of these front 9 and rear 8 parts.
  • the rear length L R of the insert 11 between the rear support surface 17 and its rear end is between 50% and 70% of the length L 1 of the entire part rear 8 of the shoe (length between the rear support surface 17 and the rear end of the shoe).
  • the front length L F of the insert 11 between the front bearing surface 18 and its front end is between 40% and 70% of the length L 2 of the front part 9 of the shoe (length between the surface d 'front support 18 and the front end of the shoe).
  • the shoe according to the invention thus has a mass of 20 to 30% lower than homogeneous aluminum shoes while having satisfactory mechanical strength.
  • FIG. 4a A second embodiment is shown in Figures 4a, 4b, 4c, 5a and 5b.
  • This mode differs from the previous one in that the inserts 11 are arranged at the joint planes 20a, 20b and 20c which separate the different segments 2a, 2b and 2c.
  • this shoe comprises at the level of its front part and in place of the arms 10 a conical part 21 to caliber.
  • This conical part has a front pocket 22 intended to receive the aerodynamic flow external to the exit of the barrel of the weapon so as to facilitate the opening of the shoe.
  • each segment 2a, 2b or 2c has two longitudinal recesses 23 which are each made at a joint plane (20a, 20b or 20c). These recesses 23 are more particularly visible in Figures 5a and 5b.
  • the recesses 23 extend on either side of the push plate 7.
  • shoe body 2 comprises at the level of the push plate 7 at least two bearing surfaces 17 and 18 for insert 11. These bearing surfaces are arranged on one side and on the other side of the push plate 7.
  • Each insert 11 is made integral with a single segment of shoe by a screw 24 which is arranged at the level of the plate thrust 7 of the segment considered.
  • This screw is housed in a counterbore 25 carried by the insert 11 so as not to interfere with the assembly of the segments (see Figure 4c).
  • the axis of the screw 24 is perpendicular to the joint plane 20 considered on which a tapping is carried out allowing to receive the screw.
  • each insert has tabs 28 which are housed in additional clearances carried by the hoof body. These tabs ensure radial retention of the insert by relation to the hoof.
  • FIGS 6a and 6b show an alternative embodiment of this second embodiment.
  • each recess 23 has a profile 26, formed here by a succession of teeth oriented perpendicular to the axis 19 of the shoe. This profile toothed 26 cooperates with a complementary profile 27 carried by insert 11.
  • inserts 11 extend on either side of the push plate 7 and the body 2 comprises at the level of the push plate two bearing surfaces 17 and 18 for the insert.
  • Each insert is attached to a shoe segment by a screw 24.
  • the front and rear ends of the inserts have tabs 28 which are housed in additional clearances carried by the hoof body and which ensure radial retention of the insert relative to the shoe.
  • FIGS 7a and 7b show another variant of execution of this second embodiment.
  • each joint plane 20a, 20b and 20c carries two recesses 23a and 23b.
  • the recess 23a is disposed in front of the plate thrust 7 and the recess 23b is disposed behind the push plate.
  • Each recess 23a or 23b receives an insert 11a or 11b separate.
  • Each recess again carries a profile 26 which cooperates with a complementary profile 27 carried by the insert.
  • the profiles are formed by a succession of teeth oriented perpendicular to the axis 19 of the shoe.
  • each insert has tabs 28 which are housed in additional clearances carried by the hoof body and which ensure radial retention of the insert relative to the shoe.
  • Each insert is attached to a shoe segment for example by collage.
EP03293350A 2003-02-10 2003-12-31 Treibkäfig für ein Unterkalibergeschoss Withdrawn EP1445573A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0301578A FR2851038B1 (fr) 2003-02-10 2003-02-10 Sabot pour projectile sous calibre
FR0301578 2003-02-10

Publications (1)

Publication Number Publication Date
EP1445573A1 true EP1445573A1 (de) 2004-08-11

Family

ID=32606040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03293350A Withdrawn EP1445573A1 (de) 2003-02-10 2003-12-31 Treibkäfig für ein Unterkalibergeschoss

Country Status (3)

Country Link
US (1) US7152533B2 (de)
EP (1) EP1445573A1 (de)
FR (1) FR2851038B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180216922A1 (en) * 2015-07-01 2018-08-02 Rwm Schweiz Ag Fin-stabilized sub-caliber projectile that can be fired from a rifled barrel, and method for the production thereof

Families Citing this family (12)

* Cited by examiner, † Cited by third party
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
FR2867267B1 (fr) * 2004-03-08 2006-05-26 Jean Claude Sauvestre Balle de chasse a bague d'expansion
US7795567B2 (en) * 2005-04-05 2010-09-14 Raytheon Company Guided kinetic penetrator
US7958829B1 (en) 2006-11-08 2011-06-14 The United States Of America As Represented By The Secretary Of The Army Sabot
DE102007037700A1 (de) * 2007-08-09 2009-02-12 Rheinmetall Waffe Munition Gmbh Treib- oder Führungskäfig und Verfahren zur Befestigung derartiger Käfige
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
DE102009009776A1 (de) * 2009-02-20 2010-08-26 Rheinmetall Waffe Munition Gmbh Patrone
US8661984B2 (en) 2011-06-22 2014-03-04 The United States Of America As Represented By The Secretary Of The Army Sabot
RU168767U1 (ru) * 2016-07-20 2017-02-17 Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования "Новосибирский Государственный Технический Университет" Бронебойный оперенный подкалиберный снаряд
US10996037B2 (en) * 2018-09-04 2021-05-04 The United States Of America As Represented By The Secretary Of The Army Obturator for robust and uniform discard
GB2578572B (en) * 2018-10-30 2022-08-17 Bae Systems Plc A sabot

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951071A (en) * 1973-07-20 1976-04-20 Rheinmetall G.M.B.H. Drive cage sub-caliber projectile
US4351094A (en) * 1978-08-08 1982-09-28 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Method of manufacturing a sabot projectile and sabot projectile produced thereby
DE4034062A1 (de) * 1990-10-26 1992-04-30 Rheinmetall Gmbh In laengsrichtung segmentierter treibring fuer unterkalibrige geschosse
US5289777A (en) * 1992-02-28 1994-03-01 Rheinmetall Gmbh Subcaliber kinetic energy projectile
USH1412H (en) * 1994-02-16 1995-02-07 The United States Of America As Represented By The Secretary Of The Army Sabot stiffener for kinetic energy projectile

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262391A (en) * 1964-10-12 1966-07-26 Budd Co Subcaliber projectile and sabot
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
DE3625730A1 (de) * 1986-08-04 1988-02-18 Rheinmetall Gmbh Treibkaefig mit einem werkstoffverbund fuer ein unterkalibriges wuchtgeschoss grossen laenge/durchmesser-verhaeltnisses
US5227580A (en) * 1990-05-04 1993-07-13 Giat Industries Sealing device for an arrow projectile
US5103735A (en) * 1991-06-20 1992-04-14 The United States Of America As Represented By The Secretary Of The Army Splined sabot
US5789699A (en) * 1996-12-16 1998-08-04 Primex Technologies, Inc. Composite ply architecture for sabots
EP0855573B1 (de) * 1997-01-27 2000-10-11 Oerlikon-Contraves Pyrotec AG Treibspiegel für Unterkalibergeschoss
US6324986B1 (en) * 1998-11-06 2001-12-04 Oerlikon Contraves Ag Cartridge-case base for a sub-caliber projectile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951071A (en) * 1973-07-20 1976-04-20 Rheinmetall G.M.B.H. Drive cage sub-caliber projectile
US4351094A (en) * 1978-08-08 1982-09-28 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Method of manufacturing a sabot projectile and sabot projectile produced thereby
DE4034062A1 (de) * 1990-10-26 1992-04-30 Rheinmetall Gmbh In laengsrichtung segmentierter treibring fuer unterkalibrige geschosse
US5289777A (en) * 1992-02-28 1994-03-01 Rheinmetall Gmbh Subcaliber kinetic energy projectile
USH1412H (en) * 1994-02-16 1995-02-07 The United States Of America As Represented By The Secretary Of The Army Sabot stiffener for kinetic energy projectile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180216922A1 (en) * 2015-07-01 2018-08-02 Rwm Schweiz Ag Fin-stabilized sub-caliber projectile that can be fired from a rifled barrel, and method for the production thereof
US10996035B2 (en) * 2015-07-01 2021-05-04 Rwm Schweiz Ag Fin-stabilized sub-caliber projectile that can be fired from a rifled barrel, and method for the production thereof

Also Published As

Publication number Publication date
FR2851038B1 (fr) 2005-03-18
US20040244631A1 (en) 2004-12-09
US7152533B2 (en) 2006-12-26
FR2851038A1 (fr) 2004-08-13

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