WO2013139594A1

WO2013139594A1 - Fin-stabilized full-calibre practice projectile

Info

Publication number: WO2013139594A1
Application number: PCT/EP2013/054434
Authority: WO
Inventors: Thomas Heitmann; Michael Vagedes; Klaus-Dieter Freudenthal
Original assignee: Rheinmetall Waffe Munition Gmbh
Priority date: 2012-03-23
Filing date: 2013-03-05
Publication date: 2013-09-26
Also published as: DE102012005742A1; EP2828608A1

Abstract

In order to ensure the firing strength of a full-calibre practice projectile (1), which has a solid head part (3) and a tubular fin body (5) adjoining the head part (3) at the rear, in a cost-effective manner, the invention proposes that the fin body (5) is designed in such a way that the propellant gases caused by the firing of the practice projectile (1) act also on the outer side (6) of the side wall (7) of the tubular fin body (5). In order to prevent the propellant gases from flowing past the practice projectile (1) on the outside within the weapon barrel, a piston ring seal (10) is provided in the area of the head part (3), wherein a radially displaceable sealing ring (11) engages into an annular groove (12) in the rear section of the head part (3). The groove base (15) of the annular groove (12) is connected to at least one axially extending recess (17) of the head part (3) via a plurality of substantially radial boreholes (16), said recess opening at the front end (18) of the head part (3), said front end delimiting the inner space (19) of the fin body (5) on the side of the projectile head.

Description

DESCRIPTION

Tail stabilized full caliber training projectile

The invention relates to a castable from a barrel ironedwerkstabilisiert.es full-caliber training projectile with a solid headboard and a rear side of the headboard subsequent tubular tail body, the training projectile is circumferentially provided with a sealing system.

Such a full-caliber training projectile is known from the document DE 10 20 0 034 33 A1. It is a large caliber, for example, from a tank cannon with the caliber 120 mm shootable training projectile. In contrast to comparable known full-caliber practice projectiles, which usually comprise a head part with an adjoining projectile casing and a shaft with fin assembly adjoining the projectile casing, the projectile casing itself is designed as a tubular fin 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 region of the headboard, which limits the interior geschosskopfseitig.

To ensure that when launching the exercise projectile disclosed in DE 10 2010 034 33 A1 no Treibiadungsgase can flow past the inner wall of the gun barrel and the outer wall of the training projectile, is approximately in the rear third of the tubular portion of the tail body outside a known sealing system arranged. This consists essentially of a recessed into the outer surface of the tail body annular groove into which a Plastic engages existing sealing ring.

When launching large-caliber practice bullets, a high internal pressure of the propellant charge gases occurs within the tubular tail body, which strongly acts on the side wall of the tubular tail body, in particular in the region between the sealing system and the head part. This can have an effect on the firing resistance, in particular when using a lighter body of a light metal.

The invention has for its object to provide a full-caliber practice bullet of the type mentioned, the firing resistance is ensured in a cost effective manner.

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 to dispense with a sealing system in the tubular portion of the tail body, so that the firing charge gases formed at the launch of the training projectile also act on the outside of the side wall of the tubular tail body and thus acting on the outside of the tubular tail body pressure the counteracts the acting on the inside of the side wall of the training projectile internal pressure. To avoid an outside bypassing the propellant charge gases on the training projectile within the gun barrel is arranged as a sealing system Koibenringdichtung in the region of the solid head part of the exercise projectile, wherein a radially displaceable sealing ring engages in an annular groove in the rear region of the head portion or in a region of the head part cross-tail fin body , In this case, the groove bottom of the annular groove is connected via a plurality of substantially radial bores with at least one axially extending recess of the head part, which opens at the front end of the head part, which defines the interior of the tail body geschoßkopfseitig.

Preferably, the sealing ring has a T-shaped cross-section and is secured by two Umgriffsleisten the annular groove, so that the sealing ring after firing of the exercise bullet remains at this. In this case, a Umgriffsieiste the annular groove can be formed by the outer wall portion of the head part and the second Umgriffsieiste by the outer wall portion of the tail body.

However, it can also be provided that the sealing ring has a rectangular cross-section, provided that it is reproducibly destroyed during firing of the training projectile by the ignition gas pressure and thrown off the training projectile in front of the weapon barrel. In this case, the Umgriffsleisten the annular groove can be omitted.

In order to securely prevent a shearing of the seal ring between the gaps of the head portion and the tail body, a shim made of a metal (e.g., steel) may be preferably provided.

In a preferred embodiment of the invention, the axial recess running in the head part is a turning gap.

Instead of a rotary gap, however, the axial recess extending in the head part may also be a bore.

To ensure that the launch of the training projectile within the gun barrel, the outside of the tail body is acted upon by the propellant charge gases, it is provided that the tubular tail body spaced apart, knob-shaped guide elements, via which the tail body is supported on the gun barrel, wherein the knob-shaped guide elements form a guide ring arranged around the tail body, and wherein the propellant gases can flow between adjacent guide elements.

The sealing ring is preferably made of plastic.

Further details and advantages of the invention will become apparent from the following, explained with reference to figures embodiment. Show it:

Fig. 1 shows a longitudinal section through an inventive, consisting of a headboard and a r-shaped tail body full caliber training projectile, wherein on the outside of the head part, a sealing system is arranged, which comprises an annular groove and a sealing ring;

Fig. 2 shows the enlarged view of a cross section through the training projectile shown in Fig. 1 along the there designated II-II section line and

Fig. 3 is an enlarged view of the head portion of the exercise projectile shown in Fig. 1, wherein the head part is shown rotated about its longitudinal axis, that two opposite radial bores are visible, which connect the annular groove of the sealing system with a rotary gap.

In Fig. 1, 1 is fired from a gun barrel, not shown leitwerkstabilisiertes full-caliber practice bullet. With the practice floor 1, a sleeve cover 2 is connected, which forms the compound of the training projectile 1 with a propellant charge, not shown, containing the propellant charge.

The exercise projectile 1 comprises a solid head part 3 with a tracer body 4 arranged on the rear side and a tubular fin body 5 adjoining the head part 3 on the rear side.

The tubular tail body 5 is designed such that the propellant gases formed during the launch of the training projectile 1 also act on the outside 6 of the side wall 7 of the tubular tail body 5.

For this purpose, the tail body 5 is formed unterkalibrig and is supported on spaced apart, knob-shaped guide elements 8 on the inner wall of the gun barrel, not shown. In this case, the nub-shaped guide elements 8 are arranged around the tail body 5 such that they form a guide ring 9 (FIG. 2), wherein the propellant charge gases can flow between adjacent guide elements 8.

In order to avoid that the propellant charge gases within the gun barrel can flow past the entire training floor 1 on the outside, a sealing system 10 is arranged in the region of the massive head part 3 of the training projectile 1. In this case, an existing plastic sealing ring 1 1 engages with a T-shaped cross section in a circumferential groove-shaped recess (annular groove) 12 in the rear-side region of the head part 3, wherein for the purpose of ease of assembly, the annular groove 12 is bounded on the rear side by the front end face of the tail 5. To secure the T-shaped sealing ring 11 second Umgriffsleisten 13, 14 are provided, wherein a Umgriffsleiste 13 of the annular groove 12 is formed by the outer wall portion of the head part 3 and the second Umgriffsleiste 14 through the outer end wall portion of the tail body 5.

The sealing system 10 is a coarse ring seal. Here, the groove base 15 of the annular groove 12 of the head part 3 {see. Also Fig. 3) via a plurality (eg eight) radial bores 16 with an axially extending recess 17 of the head part 3, which extends from the radial bores 16 to the front end 18 of the head part 3, which the interior 19 of the tail body fifth limited (Fig. 1).

In the illustrated embodiment, the radial recess 17 is a rotary gap. This is obtained by virtue of the fact that the head part 3 is composed of an outer part 30 and an inner part 31 which can be screwed into the outer part 30. In this case, the inner part 31 to the region of the radial bores 16 has a smaller outer diameter than the inner diameter of the outer part 30, so that between the inner and outer part 30, 31, the recess 17 results

The launching of the practice projectile 1 into the interior 19 of the empennage body 5 reaching propellant gases then pass partially through the rotary gap 17 in the radial holes 16 and act on a plastic Foiie 20 for sealing moisture and an elastic Unterlegband 21 on the sealing ring 1, so that this relatively large area is pressed to the outside against the inner wall of the gun barrel, not shown, and retains the on the tail body 5 outside blowing past propellant gases. The plastic film 20 may be omitted if the sealing ring 11 is pressed without or with lower band 21 directly on the head part 3 or shrunk.

The sealing ring 11, for example, before the assembly of the head part and the tail body either pressed onto the head part 3 or sprayed and anschiießend on Turned off measure and / or drawn without twisting directly on the head part 3.

Of course, the invention is not limited to the embodiment described above. For example, the Unterlegband can be omitted.

Furthermore, it can also be provided that the sealing ring only has a rectangular cross-section, provided that it is reproducibly destroyed by the muzzle gas pressure during the launch of the training projectile and thrown off the training projectile in front of the weapon barrel.

In addition, the rotary gap provided in the head part can be replaced by one or more axial bores, so that the two-part design of the head part is eliminated.

LIST OF REFERENCE NUMBERS

1 full caliber practice floor, practice floor

2 sleeve caps

3 headboard

30 outdoor unit

31 indoor food

4 tracer body

5 tail bodies

6 outside

7 sidewall

8 guide element

9 guide ring

10 seal system, piston ring seal

1 1 sealing ring

12 groove-shaped recess, annular groove

13,14 Umgriffsieisten

15 groove bottom

16 radial bore

17 recess, rotary gap

18 end (headboard)

19 interior

20 plastic film

21 underlay band

Claims

1. A turret-stabilized full-caliber practice bullet (1), which can be fired from a gun barrel, with a solid headpiece (3) and a tail end to the headpiece! (3) subsequent tubular tail unit (5), wherein the training projectile (1) is provided on the circumference with a sealing system (10), with the features: a) the tubular tail body (5) is designed such that the at the shot of the practice projectile (1) resulting propellant gases also on the outside (6) of the side wall (7) of the tubular fin body (5) act; b) the sealing system (10) is arranged in the region of the head part (3) of the training projectile (1), wherein a sealing ring (11) in an annular groove (12) in the rear-side region of the head part (3) or in a region of the C) in the sealing system (10) is a piston ring seal, wherein the groove bottom (15) of the annular groove (12) via a plurality of substantially radial bores (16) with at least one axially extending recess (17) of the head part (3) is connected, and wherein the axially extending recess (17) at the front end (18) of the head part (3) opens, which limits the interior (19) of the tail body (5) bullet head side ,

2. Exercise projectile according to claim 1 or 2, characterized in that the sealing ring (11) has a T-shaped cross section and is secured by two Umgriffsleisten (13, 14) in the annular groove (12).

3. Exercise projectile according to claim 2, characterized in that a Umgriffsleiste (13) of the annular groove (12) through the outer wall portion of the head part (3) and the second Umgriffsleiste (14) through the outer wall portion of the tail body (5) is formed.

4. Ubufengeschoss according to claim 1, characterized in that the sealing ring (11) has a rectangular cross-section.

5. Exercise projectile according to one of claims 1 to 4, characterized in that between the groove bottom (15) of the annular groove (12) and the sealing ring (1) a Unterlegband (21) is arranged.

6. Exercise projectile according to one of claims 1 to 5, characterized in that it is in the head part (3) extending axial recess (17) is a rotary gap which is formed by the fact that the head part (3) an annular groove (12) receiving the outer part (30) and a rear side in the outer part (30) screwed inner part (31), wherein up to the region of the radial bores (16), the outer diameter of the inner part (31) is selected to be smaller than the inner diameter of the outer part (30).

7. Exercise projectile according to one of claims 1 to 5, characterized in that it is in the head part (3) extending axial recess is a bore.

8. Exercise projectile according to one of claims 1 to 7, characterized in that the tubular Leitwerkskörper (5) spaced-apart, knob-shaped guide elements (8), which form one around the tail body (5) arranged around guide ring (9).

9. Exercise projectile according to one of claims 1 to 8, characterized in that the sealing ring (11) consists of plastic.