ES2294769T3 - ARTILLERIA PROJECT THAT HAS A RING. - Google Patents

Abstract

The projectile (1) comprising a body (2) with a seal band (4) fastened to it by a mounting ring (6) and a fixing with a threaded rim (7) engaging with the projectile base. The latter has a series of deformable tongues separated by slots, and the rim surrounds a cylindrical recess containing a piston (14) that can slide between locked and unlocked positions controlling the flexure of the tongues. The piston also has an axial projection (17) with a bore and valve (19) that controls the discharge of gases.

Description

Artillery projectile that has a hoop.

The technical field of the invention is of the artillery shells comprising a body on which it fix a sealing ring.

It is usual to equip a projectile with such a ring intended to ensure a tightness during shooting of the propellant gases between the projectile and the gun tube.

When the projectile is of the type gyro stabilized, the ring is usually metallic. This takes the gun tube stripes and communicates a rotation movement to the projectile body This configuration is generally applied for artillery shots, always being the tubes of striped artillery.

Nowadays projectiles are carried out that carry a bulky payload, for example projectiles that can be guided or self-guided on his career. These projectiles have a more important mass and generally comprise an instep drop-down that also occupies a certain space in the bedroom.

These projectiles reduce the volume available for the propellant gases during firing. Which results a loss of ballistic benefits.

In order to alleviate this problem, it is known by patent EP905473 (basis for the preamble of the claim 1) the arrangement of the instep in front of the ring. From this way, the instep does not penetrate into the bedroom and the volume intended for gases.

According to this patent, the ring is integral to a rear jaw that guarantees the maintenance of the instep and that It is ejected during firing thanks to a generating composition of appropriate gases.

The object of the invention is to propose such projectile in which the expulsion of the jaw is guaranteed after the tube outlet reliably and simply without it is especially necessary to apply a pyrotechnic composition specific.

Thus, the invention aims at a artillery projectile comprising a body on which it fix a sealing ring, ring attached to the projectile body by means of a mounting ring linked to the projectile body by an unlockable fixing means at the exit of the gun tube, projectile characterized in that the fixing means comprises a threaded flange receiving the ring mounting ring, flange in solidarity with the bottom of the projectile and which is constituted by deformable tabs separated by slits, delimiting, in addition, the flange a cylindrical housing that receives a piston sliding between two positions: a locked position in which is inserted into the housing against the flange, and prevents flexion of the tabs and an unlocked position in which release the tabs.

The piston may have an axial extension with at least one perforation, extension that will penetrate a bedroom arranged inside the back of the projectile.

Advantageously, the extension may house a sliding valve that will allow the propellant gases inside the chamber, pushing the pressure of the gases in the chamber the valve at the outlet of the weapon against a seat integral to the piston.

The extension may be closed by means of a perforated shutter on which a back part will be applied of the valve during firing, this rear part comprising of the valve a bumper surrounded by a protrusion in which it ends at least one longitudinal groove of the valve, being able to of this propellant gases mode during shooting enter the chamber of the projectile through the groove (s) and the perforations Shutter

The ring mounting ring may comprise a stop surface on which the piston is applied when It is in the unlocked position at the gun tube outlet.

The bedroom arranged at the back of the projectile may house a propelling cargo block that guarantees a decrease in aerodynamic drag on trajectory.

The threaded flange may be integral to a fund that guarantees a partial closing of the bedroom.

The invention will be better understood after reading the following description in a particular way of realization, description made in reference to the attached drawings and in which:

Figure 1 shows in side view a projectile according to the invention;

Figure 2a is a sectional view. longitudinal of the back of the projectile according to the invention,  projectile represented at rest before firing;

Figure 2b is a view similar to the previous one, the projectile being in the path of the gun tube;

Figure 2c is a view similar to those above, the projectile being represented at the outlet of the tube of the weapon;

Figure 2d shows the projectile shortly after its exit from the gun tube;

Figures 3a and 3b show in isolation the bottom that carries the threaded flange, the figure 3a being a cut longitudinal and figure 3b a bottom view according to the direction F1

Figures 4a and 4b show in isolation the valve, the figure 4a being a longitudinal section and the figure 4b a view of the valve according to the direction F2.

Figure 1 shows a projectile 1 according to the invention. This projectile comprises a body 2 that carries in its front part an expellable jaw 3 and in its back a ring 4.

The ring 4 is integral to a mounting ring 6 prolonged by a sheath 5 that guarantees, as described in the EP9054573 patent, maintenance retracted from an instep stabilizer (not shown).

According to an essential characteristic of the invention, means are provided that allow the ring 4 to be ejected from the gun tube outlet.

Such provision ensures the deployment of the instep from the exit of the tube of the weapon.

It also allows to reduce resistance aerodynamics on trajectory.

Figure 2a allows us to better specify the means which guarantee the expulsion of ring 4 and sheath 5. These means comprise a mounting ring 6 that allows fixing the ring 4 to projectile 1.

This mounting ring 6 is linked to the body 2 by a fixing means designed to be unlocked automatically at the exit of the gun tube (not shown).

The mounting ring 6 comprises a surface cylindrical 6a receiving the ring 4 and a female thread 6b which cooperates with a threaded flange 7 integral with the rear end of the projectile body 2.

The female thread 6b of the ring is terminated in a face 6c that serves as a stop to the ring 6 during its screwing in the flange 7. On the other hand the ring 6 comprises a collar internal 8 which is arranged remotely from the face 6c and which performs the function of a stop surface as will be described to continuation.

The threaded flange 7 is integral with a bottom 9 which guarantees a partial closure of a chamber 10, arranged in the back of projectile 2, and inside which it is arranged a block 11 of a propellant charge that guarantees a decrease of the aerodynamic drag of the projectile 1 on trajectory.

These blocks are well known to those skilled in the art under the Anglo-Saxon denomination " Base Bleed " (or bleeding shorts).

Block 11 starts with the gases thrusters during projectile firing. The same happens with the pyrotechnic device 12 whose function is to turn on again block 11 in case of extinction during the passage to the mouth of the weapon.

The bottom 9 is represented only in figures 3a and 3b. It is seen that it has a thread 9a in all its external surface what which allows its attachment to the body 2 of the projectile.

The bottom 9 comprises at one of its ends a rounded profile 9b which guarantees the fitting of the base-bleed block 11 and at the other end a cylindrical housing 13 which is intended to receive a piston 14 (see Figure 2a).

The housing 13 is delimited by the end of the bottom 9 that forms the threaded flange 7. The bottom 9 is also crossed by an axial perforation 24.

As you can see more particularly in the Figures 3a and 3b, the flange 7 is split and is constituted by deformable tabs 15 separated by grooves 16.

These tabs 15 are radially deformable in flexion. However, when the piston 14 is arranged in the housing 13, the flange 7 cannot be deformed and then the threaded connection that guarantees the maintenance of ring 6 is perfectly rigid and resists the cannon shot as well as the impact resulting from the placement of the projectile in the weapon tube.

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The piston 14 comprises a collar 14a peripheral that is tight between ring 6 and flange 7. This collar guarantees the maintenance of the piston 14 in its lock position during the storage and projectile transport.

The piston 14 also carries an extension axial 17 which has a perforation 18. This extension penetrates through the hole 24 in the chamber 10 which is arranged in the inside of the back of the body 2 of the projectile 1.

The extension 17 houses a valve 19 which can slide freely in a cylindrical recess of the extension 17. A thin paper or sheet shutter pallet aluminum (not shown) may seal perforation 18 and thus guarantee the tightness with respect to moisture.

The extension 17 is closed in its part posterior by a perforated shutter 20 on which a back of valve 19 during firing.

The valve 19 is shown alone in the figures 4a and 4b.

This comprises a cylindrical body that ends at a tapered end 19a intended to cooperate with a profile complementary conical 18a arranged in the opening 18 of the piston 14 and that constitutes a seat for the valve.

The other end of the valve 19 comprises a Busty 21 that is surrounded by a shoulder 22.

The valve body 19 also has grooves. longitudinal 23 regularly distributed angularly (here four slots). The slots 23 lead to the level of the shoulder 22

When valve 19 is resting against the shutter 20, the perforations of the latter are in front of the shoulder 22 and therefore are not blocked by the busty 21.

In this way during firing, the gases propellers that pass through the opening 18, can also enter the chamber 10 of the projectile through the slots 23 and the shutter perforations 20.

The operation of the device is the next.

Throughout the interior ballistics phase, the valve 19 is resting against shutter 20 (figure 2b). The propellant gases pass through drilling 18 (after have eventually broken the sealing pallet), follow the slots 23 and enter chamber 10 through the shutter holes 20. The pressure is then balanced between the inside of the chamber 10 and the chamber of the weapon (not shown).

Ring 6 is inserted into the thread of the flange 7. The latter is firmly held by piston 14 and is guaranteed the mechanical behavior of the hoop.

At the exit of the gun tube, the pressure in the bedroom 10 becomes superior to that exerted on the face outer piston 14. The gases trapped in the chamber push then the valve 19 towards the piston 14. The conical end 19a of the valve 19 is then applied on its seat 18a at the level of the opening 18 of piston 14 (figure 2c).

Once in contact with the piston, the valve seal the opening 18. The gases present in the chamber 10 are no longer they can escape and then exert their pressure on the face internal to the piston 14. Gas pressure causes shearing of collar 14a of piston 14. Then the latter is pushed back and bumps against collar 8 of ring 6.

In the unlocked position of Figure 2c, the piston 14 no longer prevents the bending of the tabs 15. Indeed its external flange is completely separated from the cylindrical housing 13 from the bottom 9.

The gas pressure keeps pushing the piston 14 that pulls the ring 6. An effort is exerted longitudinally by ring 6 on the thread of the flange 7. It has the effect of flexing the tabs 15. The dragged ring 6 by piston 14 it is ejected (figure 2d).

Unlocking and ejecting ring 6 that wears the hoop as well as the release of the folding clasp by the pod 5 intervene then in the first meters of the projectile trajectory.

Claims (7)

1. Artillery projectile comprising a body (2) on which a sealing ring (4) is fixed, ring fixed to the projectile body by means of a mounting ring (6) linked to the projectile body by an unlockable fixing means at the exit of the tube of the weapon, projectile characterized in that the fixing means comprises a threaded flange (7) that receives the ring (6) of the ring mounting, flange integral to a bottom (9) of the projectile and that is constituted by tabs (15) deformable separated by slits (16), also defining the flange (7) a cylindrical housing (13) that receives a sliding piston (14) between two positions: a locking position in which it is inserted into the housing (13 ), against the flange (7), and prevents bending of the tabs (15) and an unlocking position in which it releases the tabs (15). 2. Artillery projectile according to claim 1, characterized in that the piston (14) has an axial extension (17) with at least one perforation, an extension that penetrates a chamber (10) disposed inside the back of the projectile. 3. Artillery projectile according to claim 2, characterized in that the extension (17) houses a sliding valve (19) which, during firing, allows the propellant gases to enter into the chamber (10), pushing the gas pressure into the chamber the valve (19) at the outlet of the gun tube against a seat (18a) integral with the piston (14). 4. Artillery projectile according to claim 3, characterized in that the extension (17) is closed by means of a perforated plug (20) on which a rear part of the valve (19) will be applied during firing, this rear part comprising the valve a pin (21) surrounded by a projection (22) in which at least one longitudinal groove (23) of the valve (19) flows, thus being able to propel the gases during the shot to enter the chamber (10) of the projectile through the groove (23) and the perforations of the shutter (20). 5. Artillery projectile according to one of claims 1 to 4, characterized in that the ring mounting ring (6) (4) comprises a stop surface (8) on which the piston (14) is applied when in position unlocking at the gun tube outlet. 6. An artillery projectile according to one of claims 2 to 5, wherein the chamber (10) arranged in the rear of the shell has a block (11) of propellant charge ensuring a reduction of drag on trajectory. 7. Artillery projectile according to claim 6, characterized in that the threaded flange (7) is integral with a bottom (9) that guarantees a partial closure of the chamber (10).