Projectile base for carrier projectiles

Details Projectile base for carrier projectiles Projectile base for carrier projectiles

1990-03-22

1991-07-23

Tudor, Harold J.

Ammunition and explosives

Shells

With secondary shells

102357, 102473, 102517, 102524, F42B 1262

Patent

active

050333887

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a projectile base for carrier projectiles carrying submunition, with the projectile base including a base body having a front section with a cylindrical outer surface, a tail section with a conically tapered outer surface and a base plate, a rotating band disposed on the cylindrical outer surface portion of the base body, and respective cavities disposed in the respective ends of the base body with the base plate therebetween.
Such a projectile base is disclosed, for example in German patent DE No. 3,643,291. As tests have shown, such bases exhibit an unfavorable deformation behavior. This leads to problems in sealing and in the transmission of spin by the rotating band. The gas breakthrough that is unavoidable at high gas pressures (loss of contact between rotating band and tube wall) leads to continuous opening and closing of the sealing gap during passage through the tube and thus to the excitation of oscillations of the projectiles resulting in increased tube wear.
The cause of these sealing problems is that the axial force components acting on the tail of the projectile during firing cause the base plate to be axially bent, and is associated with radial widening of the front projectile base body and radial constriction of the rear projectile base and the rear rotating band region. The radial deformation by the axial force components during firing is superposed on the radial deformations due to the simultaneously acting radial force components. This superposition is the cause of the resulting radial deformation of the projectile base.
The radially acting forces result, on the one hand, from the gas pressure which extends to the rear end of the rotating band and from the rotating band pressure. These forces lead to radial constriction of the base body over its entire length. If, the superposition of both deformation states results in radial constriction at the rear edge of the rotating band, there will be loss of contact between the rotating band and the tube. This exposed gap area fills with gas which is equivalent to an increase in the radial force acting on the base body. The result is further enlargement of the radial constriction in the rotating band region and finally a complete gas breakthrough.
Furthermore, U.S. Pat. No. 4,327,643 discloses explosive projectiles whose base plates are curved at the tail end. However, the interior of the projectiles is filled with an explosive so that the base plate cannot be deformed much in the axial and radial directions (if a cavity were present in the interior of these projectiles, the projectile base, due to its thin walls and the extreme curvature of its base and absent the radial support by the explosive, would collapse under the gas pressure existing up to the rotating band during firing).


SUMMARY OF THE INVENTION

It is the object of the present invention to provide a projectile base of the above mentioned type in which radial constriction in the region of the rotating band is avoided.
This is accomplished according to the invention by providing the surface of the base plate which faces the tail of the base with a curvature such that this surface is curved and tapers rearwardly toward the projectile tail.
The invention is thus based on the idea that the deformation behavior during firing can be corrected by giving the base a curved configuration in that then the axial curvature of the base causes radial widening also in the rear projectile base region. This form-specific base deformation during firing ensures gas tightness and spin transmission from the rotating band even under high gas pressures.
U.S. Pat. No. 4,327,643 does not disclose the idea significant for the above-mentioned invention. In that reference, a corresponding radial constriction of the rotating band is not to be prevented and does not occur at all because the projectile itself is filled with explosive down to the base plate.
Details and advantages of the invention will be described below in connection with embodiments and with the

REFERENCES:
patent: 2507878 (1950-05-01), Banning
patent: 4327643 (1982-05-01), Barrios

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