Ammunition and explosives – Projectiles – Composite
Patent
1988-06-30
1989-10-03
Brown, David H.
Ammunition and explosives
Projectiles
Composite
102501, F42B 3100
Patent
active
048709050
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a spin stabilized projectile having a rotating band disposed on the shell body, with the rotating band, in order to receive the rotating band material sheared off toward the rear when the projectile passes through a gun barrel, being provided with grooves so that the spin is transferred with the aid of annular rotating band zones (spin transfer rings), and with the diameter of at least one spin transfer ring being larger than the diameter of the rifling grooves of the gun barrel.
In spin stabilized projectiles, the projectiles are equipped, in order to transfer the spin, with one or sometimes, for reasons of stress and deformation, also with a plurality of rotating bands arranged one behind the other (spin transfer rings). The rotating bands have such diameters that, during passage of the projectile through the gun barrel, they pass themselves into the rifling grooves. It is known to provide circumferential grooves in the rotating band to receive the rearwardly sheared off rotating band material (see, for example, U.S. Pat. No. 3,910,194). The rotating bands are generally made of copper, soft iron or plastic.
With these prior art rotating bands, radial contact between the gun barrel and the rotating band is established only by way of the spn transfer rings. This contact produces a radial pressure on the shell body (rotating band pressure). Particularly if thin shell bodies are employed in which the ratio of the wall thickness of the shell body to the caliber of the gun barrel is usually less than or equal to 0.05, the projectile reacts with particular sensitivity to radial pressure since at locations which depend on the geometry of the projectile there may be great stresses on the material. This may cause, inter alia, the shell body to be pressed inwardly and the seal against the propellant gases customarily provided by the rotating band is no longer ensured.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to provide a spin stabilized projectile of the above-mentioned type in which, primarily with the use of very thin-walled bodies, the shell body is stress relieved in the region of the rotating bands and thus experiences low radial deformation while simultaneously ensuring spin transfer.
This object is accomplished according to the invention by a spin stabilized projectile having a rotating band disposed on the shell body with the rotating band, in order to receive the rotating band material sheared off toward the rear when the projectile passes through a gun barrel, being provided with a plurality of circumferential grooves so that the spin is transferred with the aid of a plurality of annular rotating band zones (spin transfer rings); and wherein: the diameter of the rearmost spin transfer ring is larger than the diameter of the rifling grooves of the gun barrel; and the diameter of at least one of the remaining spin transfer rings is smaller than the diameter of the rifling grooves but larger than the caliber of the gun barrel.
The invention is thus based on the idea of providing spin transfer rings in the rotating band to produce a seal against the propellant gases and creating spin transfer rings which serve merely to transfer spin and thus perform a pressure relief function as a result of the missing radial contact between the ring surface and the bottom of the rifling grooves in the gun barrel. These spin transfer rings are able to act as a seal only in the region of the lands in the gun barrel.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail below with reference to an embodiment and with the aid of drawing figures wherein:
It is shown in:
FIG. 1 shows a prior art projectile equipped with a rotating band according to the invention;
FIG. 2 is a detail view of a rotating band according to the invention disposed on the shell body; and
FIG. 3 is a partial cross-sectional view of a gun barrel equipped with rifling grooves and lands to illustrate the invention.
DETAILED DESCRIPTI
REFERENCES:
patent: 1529664 (1925-03-01), Moriarty
patent: 2454801 (1948-11-01), Himmer
patent: 4242961 (1981-01-01), Moredock et al.
patent: 4552071 (1985-11-01), Horais et al.
Karius Klaus D.
Kruse Heinz-Josef
Sippel Achim
Brown David H.
Rheinmetall GmbH
LandOfFree
Spin stabilized projectile does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spin stabilized projectile, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin stabilized projectile will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-658386