EP1384971A1 - Treibkäfig für unterkalibriges Geschoss und mit einem solchen Treibkäfig versehenes Geschoss - Google Patents

Treibkäfig für unterkalibriges Geschoss und mit einem solchen Treibkäfig versehenes Geschoss Download PDF

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Publication number
EP1384971A1
EP1384971A1 EP03291632A EP03291632A EP1384971A1 EP 1384971 A1 EP1384971 A1 EP 1384971A1 EP 03291632 A EP03291632 A EP 03291632A EP 03291632 A EP03291632 A EP 03291632A EP 1384971 A1 EP1384971 A1 EP 1384971A1
Authority
EP
European Patent Office
Prior art keywords
projectile
shoe
zone
rib
caliber
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Withdrawn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
EP03291632A
Other languages
English (en)
French (fr)
Inventor
M. Nicolas Eches
M. 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 EP1384971A1 publication Critical patent/EP1384971A1/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Withdrawn legal-status Critical Current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

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 hoof caliber part, 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 projectile.
  • this shoe wears ribs which also guide the projectile in the tube.
  • the invention provides a shoe for projectile under calibrated with reduced mass while having rigidity sufficient cross-section.
  • the shoe according to the invention allows also to provide guidance in the barrel of the weapon itself for a very long projectile.
  • the subject of the invention is therefore a projectile shoe under calibrated comprising at least two segments, each segment comprising at least one reinforcing rib longitudinal extending from a rear area of the hoof towards a caliber front plate, shoe characterized in that the rib has at least two parts, a first part having an increasing height between a rear area and a intermediate zone which is located upstream of the front plate in size, a second part of the rib having a constant height equal to the gauge between the zone intermediate and an area adjacent to the front plate at caliber.
  • the second part of the rib has a thickness which is increasing between the intermediate zone and the neighboring zone of the caliber front plate.
  • Each shoe segment may have a rear stud to the caliber.
  • the invention also relates to a projectile under calibrated equipped with such a shoe, projectile comprising a shoe of the towed type and having guiding characteristics in the tube which are improved.
  • This projectile includes an under-calibrated bar maintained by a hoof. It is characterized in that the plate at the caliber is a push plate intended to receive the gas pressure and. which is located axially in front of a transverse median plane, orthogonal to the bar and passing through the center of gravity of the complete projectile.
  • 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 and a rear retaining ring 6.
  • the segments are in contact with each other at the level of parting lines 10a, 10b and 10c (see Figures 2, 3 and 4).
  • the bar carries a thread (or grooves) which cooperates with a complementary thread (or grooves) of the hoof. Such a provision ensures the drive in translation of the bar by the hoof.
  • the shoe shown here is of the "towed” type that is, it has a caliber front plate which is its PP push plate (part carrying the belt sealing 5). This push plate is located axially in front of a median transverse plane PM of the bar 3.
  • the median plane PM is the plane orthogonal to bar 3 and passing by the center of gravity of the complete projectile.
  • a towed shoe increases the load mass propellant, part of it being around the shoe behind the push plate. So we increase the initial velocity of the projectile. Powder volume additional thus available is of the order of 0.5 liters for a 120mm caliber. This results in an increase of initial speed of the order of 2%.
  • each segment of the shoe 2 has a longitudinal reinforcing rib 7 which extends from a rear zone 8 of the shoe towards the push plate PP.
  • the rib 7 is practically useless in the vicinity of the rear part 9 of the shoe while it is essential for vicinity of the PP push plate.
  • the hoof geometry can therefore be optimized so as to the ribs 7 have mass and geometry corresponding to those that are just necessary to the mechanical drive of the bar 3.
  • a bar of 23 mm in diameter and 700 mm long, and a 450 mm shoe long, zone 9 from which begins the second part 7b of the rib size is approximately 70 mm behind the PP push plate.
  • the parts 7b of the ribs which are of caliber improve the guidance of the projectile in the tube of the weapon. Furthermore, the contact of the shoe with the tube the weapon at the ribs allows to greatly increase the apparent rigidity of the shoe inside the tube. Indeed, the latter maintains the hoof and has a rigidity infinitely greater than that of the hoof. The outfit the bending of the hoof inside the tube is therefore strongly increased without the need to increase the mass of the shoe.
  • the second part 7b of each rib 7 has a thickness e which is increasing between the intermediate zone 9 and the plate PP push.
  • Another advantage of this arrangement is that it allows to distribute the pressure forces exerted by the gases on a part of the shoe located behind the push plate PP. This reduces the maximum axial stresses suffered by the bar. Indeed the efforts undergone by the bar are found distributed over a hoof / rung interface length which is superior.
  • each segment 2a, 2b, 2c of the shoe has a rear stud 11 at caliber. This stud improves the guidance of the projectile in the barrel of the weapon.
  • ribs may extend between the substantially middle push plate and a plate front caliber (not shown) forming an air pocket.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
EP03291632A 2002-07-24 2003-07-02 Treibkäfig für unterkalibriges Geschoss und mit einem solchen Treibkäfig versehenes Geschoss Withdrawn EP1384971A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0209410A FR2842898B1 (fr) 2002-07-24 2002-07-24 Sabot pour projectile sous calibre et projectile equipe d'un tel sabot
FR0209410 2002-07-24

Publications (1)

Publication Number Publication Date
EP1384971A1 true EP1384971A1 (de) 2004-01-28

Family

ID=29797661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03291632A Withdrawn EP1384971A1 (de) 2002-07-24 2003-07-02 Treibkäfig für unterkalibriges Geschoss und mit einem solchen Treibkäfig versehenes Geschoss

Country Status (3)

Country Link
EP (1) EP1384971A1 (de)
FR (1) FR2842898B1 (de)
IL (1) IL157067A0 (de)

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
CN114857995A (zh) * 2022-04-20 2022-08-05 西北工业大学 一种发射装置推动弹及发射装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284008A (en) * 1979-04-12 1981-08-18 The United States Of America As Represented By The Secretary Of The Army Double ramp discarding sabot
EP0403730A2 (de) * 1989-06-21 1990-12-27 Rheinmetall GmbH Treibkäfig

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284008A (en) * 1979-04-12 1981-08-18 The United States Of America As Represented By The Secretary Of The Army Double ramp discarding sabot
EP0403730A2 (de) * 1989-06-21 1990-12-27 Rheinmetall GmbH Treibkäfig

Cited By (4)

* 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
CN114857995A (zh) * 2022-04-20 2022-08-05 西北工业大学 一种发射装置推动弹及发射装置
CN114857995B (zh) * 2022-04-20 2024-01-16 西北工业大学 一种发射装置推动弹及发射装置

Also Published As

Publication number Publication date
FR2842898A1 (fr) 2004-01-30
FR2842898B1 (fr) 2006-11-24
IL157067A0 (en) 2004-02-08

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