ES2293628T3 - SEALING RING FOR ARTILLERIA PROJECT. - Google Patents

Abstract

The seal band, comprising an anti-slip ring (6) that turns on a support (5), incorporates a copper ring (7) of the same diameter as the gun barrel. The copper ring, which has a thickness no more than 5 per cent of the barrel calibre, is located in front of the anti-slip ring and is of smaller diameter than the latter. It is held at a set distance from the anti-slip ring by a spacer (8).

Description

Sealing ring for projectile artillery.

The technical field of the invention is that of sealing rings for projectiles and especially for sliding rings such as those described in the preamble of the claim 1.

It is usual to provide a projectile with a ring of tightness This is intended to ensure during shooting the tightness with respect to the propellant gases between the projectile and The weapon tube.

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

Projectiles are also known that are not gyro stabilized, but stabilized by instep. They are by example, subcalibrated howitzers, called arrow howitzers, or calibrated shells equipped with a formed load.

These projectiles are usually fired down the smooth bore carriage cannons and the projectile ring then, most of the time, it is made of plastic material. Do not then, during shooting, the rotation of the projectile in the gun tube.

When such a projectile is to be fired from a fluted tube, the problem arises to avoid its drag in tube rotation. To this end, they have been considered different solutions, the most classic being the one called the ring slider

Such ring comprises a sliding bushing. mounted on a fixed subcap. The sliding bushing is dragged along the stretch marks of the gun tube, but it slides over the sub-cap and therefore does not drag the projectile into rotation.

Patent FR2606869 describes such a ring slider

Today it is intended to shoot from tubes artillery (therefore, striated) long-range projectiles that display an instep on trajectory.

These projectiles must not be dragged into rotation by the gun tube. Therefore, they have been applied with such shells the known concepts of slip ring.

US-5164540 (basis for the preamble of claim 1) describes a ring of projectile tightness comprising a sliding bushing swivel mounted on a ring holder and provided in front of a ring of external diameter noticeably of the caliber of the gun tube. The function of this ring is to limit the friction of the sliding ring.

Today it is intended to shoot from tubes artillery (therefore, striated) long-range projectiles that display an instep on trajectory.

These projectiles must not be dragged into rotation by the gun tube. Therefore, they have been applied with such shells the known concepts of slip ring.

However, it has to face another difficulty that is the impossibility of such rings guaranteeing a blockage of the projectile body in the forcing cone of the weapon tube

This problem did not arise with the armament of armored vehicles that fire ammunition with cartridge and with reduced situation angles (less than 30º).

In the field of artillery, the howitzer alone and then a weapon is deposited in the chamber certain number of modules or bags of propellant gunpowder.

Moreover, this process of loading in several loads must be able to be done for important situation angles (from 30º to 50º) for the weapon tube.

Classic metal ring shells are they enter the forcing cone and remain locked in This level for your ring. Then, it is possible to place the propellant charge without running the risk of the howitzer backs off and shock against the load.

A howitzer fitted with a sliding ring of plastic material bounces against the forcing cone and returns to fall into the chamber of the weapon making it impossible, even dangerous, the installation of the propelling load.

The objective of the invention is to mitigate such inconveniences, proposing a sliding sealing ring adaptable to an artillery shell and that guarantees the blocking of the latter in the forcing cone of a tube of weapon.

Thus, the object of the invention is a projectile sealing ring comprising a bushing slide mounted swivel on a ring holder that comprises, in front of the sliding bushing, a diameter ring externally of caliber of the tube of the weapon and inferior to the diameter of the sliding sleeve, characterized in that the ring it is kept at a distance from the sliding bushing by a separator whose length is chosen so that the ring is inserted into the stretch marks of the tube before the bushing Slider comes into contact with the forcing cone.

Advantageously, the ring can be made in copper.

The ring may have a lower thickness or equal to 5% of the caliber.

The ring holder may carry the bushing, the separator and the ring and will guarantee the fixation of the set on a back of a projectile.

The invention will be better understood after following description of different embodiments, description made in reference to the attached drawings and in the which:

fig. 1 is a partial and sectional view of the back of a projectile equipped with a ring according to the invention;

fig. 2 represents this same projectile installed in the tube of an artillery cannon.

A part has been shown in figure 1 rear of a projectile 1 of artillery of axis 1a. This part posterior comprises a threaded surface 2 extending from a radial projection 3 to a fixing nut 4. The threaded surface receives a cylindrical support 5 made for example in aluminum. This support rests against the projection 3 and comprises a projection radial posterior 5a.

Specifically, the ring 7 will have a diameter slightly higher than the caliber (a few tenths of a mm) and it will perform, for example, in copper.

The thickness of the ring will be chosen relatively reduced, for example less than or equal to 5% of the caliber (i.e. of the order of 6 mm) so as not to cause friction too much important during shooting and not hinder the sliding of the bushing 6.

The ring 7 is kept away from the sliding bushing 6 by means of a spacer 8 whose length is choose so that the ring 7 can be found inserted in the stretch marks of the tube before the sliding sleeve 6 enters in contact with the tube forcing cone. Usually, a separator with a length of the order of 20 to 25% of the caliber.

This separator is done for example in aluminum.

When the support 5 is screwed on the part threaded 2 of projectile 1, bushing 7 is applied against the projectile 3 of projectile 1.

The ring holder 5 thus carries the bushing 6, spacer 8 and ring 7 and allows fixing the ring assembly on the back of projectile 1.

Next, the operation of the ring according to the invention in reference to the figure 2.

Projectile 1 has been represented in the latter installed in the striated tube 9 of an artillery cannon. Be also observe in this figure the chamber 11 of the barrel and the cone forcing 10 connecting the chamber 11 to the striated part of tube 9.

It is noted that ring 7 is introduced under pressure at the stretch mark of tube 9 (part calibrated). However, the bushing 6 is just in contact with the forcing cone 10 and has not yet deformed.

The projectile is generally projected in the chamber of the weapon by means of a loading system. The impact resulting has caused the introduction of the ring 7 in the tube 9 and its deformation to the passage of the forcing cone 10.

The ring 7 is sized so that it can pass the forcing cone 10 and ensure projectile blockage for all situation angles and all operating temperatures provided.

This block is obtained without deforming the own sliding bushing 6. This avoids any rebound phenomenon of the projectile during its installation and it guarantees reliable blockage of the projectile in the tube without deteriorating the sliding ring Therefore, a disengagement is no longer feared untimely projectile that would impact the charges propellers before firing.

The person skilled in the art will easily dimension the different components of the ring to get the operation  desired in which the function of the ring is separated projectile lockout of the sealing function by bushing slider

Claims (4)

1. Projectile sealing ring comprising a sliding bushing (6) swivel mounted on a ring support (5) comprising, in front of the sliding bushing (6), a ring (7) of external diameter substantially of the caliber of the pipe tube weapon and smaller than the diameter of the sliding bushing (6), characterized in that the ring (7) is kept at a distance from the sliding bushing (6) by a spacer (8) whose length is chosen so that the ring (7) is inserted in the stretch marks of the tube before the sliding bushing (6) comes into contact with the forcing cone (10). 2. Sealing ring according to claim 1, characterized in that the ring (7) is made of copper. 3. Sealing ring according to one of claims 1 or 2, characterized in that the ring (7) has a thickness less than or equal to 5% of the caliber. 4. Sealing ring according to one of claims 1 to 3, characterized in that the bushing (6), the spacer (8) and the ring (7) are mounted above the ring support (5), ring support (5) which ensures the fixation of the assembly on a back of a projectile (1).