EP2841871B1 - Practice cartridge - Google Patents

Description

The invention relates to a training cartridge with a propellant powder at least partially filled propellant charge containing an axially extending into the interior of the propellant charge propellant charge, and a front mounted on the propellant charge, stabilizer stabilized full-caliber exercise bullet, the exercise bullet a solid headboard and a rear side comprises tubular Leitwerkskörper adjoining the head part.

Such a full-caliber practice bullet is from the document DE 10 2010 034 333 A1 known. It is a large caliber, for example, from a tank cannon with the caliber 120 mm shootable training projectile. In contrast to comparable known Vollkaüber training projectiles, which usually comprise a head part with an adjoining projectile casing and a shaft with fin assembly adjoining the projectile casing, the projectile projectile itself is designed as a tubular constrictor body in the aforementioned training projectile, so that a separate shank may be omitted with attached fin assembly. The resulting at the launch of the practice projectile projectile charge gases reach in this full-caliber training projectile in the interior of the tubular tail body and act to accelerate the practice projectile on the rear-side portion of the headboard, which limits the interior geschosskopfseitig.

From the DE 10 2007 039 532 A1 a large caliber cartridge is known which comprises a propellant charge case and a sabot with a subcaliber penetrator following the propellant charge case. In order to avoid that when using a reduced amount of propellant powder in the firing of the cartridge to undesirable pressure waves within the gun barrel, it is proposed that the propellant charge powder in a direction extending in the longitudinal axis of the cartridge, the propellant igniter enclosing, bag-shaped container within the propellant charge case to arrange, wherein the longitudinal axis of the cartridge is also the axis of symmetry of the bag-shaped container.

Experiments by the Applicant have now shown that when using in the DE 10 2010 034 333 A1 revealed exercise cartridge even then may still lead to unwanted gas pressure oscillations in the corresponding gun barrel at a firing of the exercise cartridge when the propellant located in the propellant charge powder is in a direction extending in the longitudinal axis of the cartridge, bag-shaped container. Under certain circumstances, such gas pressure fluctuations can lead to leaks on the bottom of the sleeve.

The invention has for its object to provide an exercise cartridge of the type mentioned, occur in the after firing even with relatively small amounts of propellant powder (bulk powder) no significant pressure fluctuations in the gun barrel.

This object is achieved by the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the dependent claims.

The invention is based essentially on the idea that the sack-shaped container containing the powder charge extends axially from the bottom end region of the propellant charge sleeve into the interior of the tubular tail body, wherein the longitudinal axis of the cartridge is simultaneously the axis of symmetry of the sack-shaped container.

As has been shown, this measure prevents uneven pressure build-up during the onset and burnup of the propellant charge powder in the cartridge and virtually completely avoids pressure waves within the weapon barrel.

By avoiding pressure waves after firing an exercise cartridge, the sleeve-bottom-side sealing problems occurring in comparable known cartridges are advantageously avoided as well. In addition, results from the uniform pressure build-up within the gun barrel, a small dispersion of the muzzle velocities v _{0 of} the inventive missiles fired from the corresponding weapon barrel.

Preferably, the bag-shaped container should extend over a length range L axially in the tubular tail body, which is greater than Lo / 2, wherein Lo means the length of the interior of the tubular tail body.

In a preferred embodiment, for the axial and radial centering of the bag-shaped container, the front end face of the propellant charge sleeve terminates with an annular wall portion through which the bag-shaped container is passed and on which the bag-shaped container is supported with its side wall.

Further details and advantages of the invention will become apparent from the following, explained with reference to a figure embodiment.

The figure shows the longitudinal section of an inventive, provided with the reference numeral 1 exercise cartridge, which consists essentially of a propellant charge case 2 and a front side attached to the propellant charge case 2, stabilizer stabilized full-caliber practice bullet 3.

The training projectile 3 comprises a solid head part 4 and a tubular tail body 5 adjoining the head part 4 at the rear.

The propellant charge shell 2 is composed of a sleeve cover 6, a sleeve shell 7 consisting of combustible material and a sleeve base 8 consisting of steel, for example.

The propellant charge powder 9 contained in the propellant charge casing 2 is arranged in a cotton-like fabric extending in the direction of the longitudinal axis 100 of the practice cartridge 1 and enclosing a propellant charge igniter 10 (powder bag) 11. In this case, the powder bag 11 extends axially from the bottom end portion 12 of the propellant charge shell 2 into the interior 13 of the tubular tail body 5, wherein the powder bag 11 extends axially over a length range L in the tubular tail body 5, which is greater than Lo / 2 where Lo is the length of the inner space 13 of the tubular tail body 5.
For axial and radial centering of the powder bag 11 includes the front end of the Propellant charge shell 2 with an annular wall portion 14 from, through which the powder bag 11 is passed and on which the powder bag 11 is supported with its side wall 15.

LIST OF REFERENCE NUMBERS

1

practice round

2

Cartridge case

3

Volikaliber training floor, training floor

4

headboard

5

tail body

6

casing cover

7

sleeve shell

8th

sleeve base

9

Propellants

10

charge igniter

11

bag-shaped container, powder bag

12

end

13

inner space

14

wall area

15

Side wall

100

longitudinal axis

L

length range

Lo

Length of the interior

Claims (3)

1. Practice cartridge comprising a propellant charge case (2), which is at least partially filled with a propellant charge powder (9) and contains a propellant charge igniter (10) extending axially into the interior of the propellant charge case (2), and a fin-stabilized full-calibre practice projectile (3), fastened to the front of the propellant charge case (2), wherein the practice projectile (3) comprises a solid head part (4) and a tubular fin body (5) adjoining the head part (4) to the rear, characterized by the features:

   a) the propellant charge powder (9) is arranged in a container (11) in the form of a bag, which extends in the direction of the longitudinal axis (100) of the practice cartridge (1) and encloses the propellant charge igniter (10), and

   b) the container (11) in the form of a bag extends axially from the bottom end region (12) of the propellant charge case (2) into the interior space (13) of the tubular fin body (5).
2. Practice projectile according to Claim 1, characterized in that the container (11) in the form of a bag extends over a linear region L axially into the interior space (13) of the tubular fin body (5) that is greater than Lo/2, where Lo is the length of the interior space (13) of the tubular fin body (5).
3. Practice projectile according to Claim 1 or 2, characterized in that, for the axial and radial centring of the container (11) in the form of a bag, the front end face of the propellant charge case (2) terminates with an annular wall region (14), through which the container (11) in the form of a bag is led and on which the container (11) in the form of a bag is supported with its side wall (15).

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