JP2943077B2 - Obturator of wing stable bullet - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an obturator of a stable wing bullet in which the spin rate of a bullet is reduced.

(Prior art) Conventional wing stabilizers with wings at the rear of the bullet have an obturator that slides against the inner peripheral surface of the gun when firing from the gun to prevent the combustion gas of the propellant from leaking. Is provided.

The obturator is formed in a ring shape from a metal such as copper or a synthetic resin such as nylon, and is fitted in an annular groove b formed on the circumferential surface of the bullet a as shown in FIG. The inner peripheral surface of the obturator c is formed in a flat surface so as to closely contact the inner bottom surface of the annular groove b to obtain a high sealing effect.

Also, when the above-mentioned wing stabilizing bullet is fired from the orbital rifle (rifle bore), the outer peripheral surface of the obturator c bites into the rifle on the inner surface of the gun and generates a vertical force directed toward the center. Thus, the inner peripheral surface of the obturator c comes into pressure contact with the inner bottom surface of the annular groove b.

(Problems to be solved by the invention) As mentioned above, the wing stabilization bullet uses a rifle bore (rifle bore).
Although it is required to fly at a low spin rate after being fired, in an obturator having a flat inner peripheral surface as in the past, the inner peripheral surface is strongly pressed against the inner bottom surface of the annular groove by a vertical force. Then, the frictional force between the two increases, and the relative slip of the obturator with respect to the bullet decreases.

As a result, when the obturator is rotated by the rifle inside the gun when firing, the bullet is also rotated by friction,
When flying, the spin rate of the wing stabilizing bullet increased, and when the formed explosive in the bullet detonated, the Monroe effect did not work effectively and there was a problem that the destruction decreased.

In addition, detonation means that explosives burn rapidly at a speed higher than the speed of sound,
And it means an explosion reaction accompanied by a shock wave.

Also, the Monroe effect means that when a conical liner is placed inside a bullet and a shaped explosive is detonated, the liner collapses and a jet is formed, and this jet gradually grows, and after the jet, a part of the liner becomes massive. It means that the power of the molded explosive is increased.

SUMMARY OF THE INVENTION The present invention has been made in order to improve the above-mentioned problems, and has as its object to provide an obturator of a wing-stabilized bullet capable of reducing the number of spins during flight.

(Means and Actions for Solving the Problems) In order to achieve the above object, the present invention relates to a wing stabilizing bullet provided with an obturator on the outer peripheral portion of a bullet having a wing at the rear to prevent gas leakage at the time of firing by a gun. A groove is formed on the inner peripheral surface of the obturator in the circumferential direction.

As a result, even when the outer peripheral surface of the obturator bites into the rifle on the inner surface of the gun and receives a vertical force toward the center when the wing stable bullet is fired, the obturator is deformed by the groove and absorbs the vertical force. Frictional force can be reduced.

Also, by providing a plurality of notches on the inner peripheral surface of the obturator, the stress concentrates on the notch due to the gas pressure acting on the inner peripheral surface, and the obturator breaks off from the notch, so that the obturator can be more reliably released from the bullet after firing. Can be.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS.

FIG. 1 is a cross-sectional view of a wing stabilizing bullet mounted on a medicine case. In this figure, 1 denotes a wing stabilizing bullet, 2 denotes a medicine stowage, and 3 denotes an obturator.

The wing stabilizing bullet 1 contains a formed explosive charge 4 inside, and a rear portion of the wing stabilizing bullet 1 is inserted into the medicine casing 2 through an opening on the tip side of the medicine casing 2.

The firearm 2 is almost completely filled with the firing charge 7, and a fire tube 8 for igniting the firing charge 7 is attached to the rear end of the firearm 2.

On the other hand, an annular groove 5a is formed on the outer peripheral surface of the wing stabilizer 1 protruding from the tip of the medicine case 2, and the obturator 3 is fitted into the annular groove 5a.

The obturator 3 is formed in a ring shape from a synthetic resin such as nylon, the outer peripheral surface is tapered so that the front end side has a small diameter, and the inner peripheral surface is in close contact with the front and rear ends of the inner bottom surface of the annular groove 5a. It is formed on a flat surface.

On the inner peripheral surface of the obturator 3, a concave groove 3a is formed in the circumferential direction over the entire circumference as shown in FIG.

Next, the operation will be described. In firing the wing stabilizing shell 1 from the gun, the wing stabilizing shell 1 is loaded into the gun together with the shell 2 and the firing charge in the shell 2 by the fire tube 8 of the shell 2. Ignite 7.

As a result, the propellant charge 7 burns to generate high-pressure gas, and the wing stabilizing bullet 1 is fired forward by this gas pressure.
Is pressed toward the center of the bullet 5 by digging into the rifle inside the gun.

As a result, the inner peripheral surface of the obturator 3 is pressed against the inner bottom surface of the annular groove 5a by a vertical force.
Since a concave groove 3a is formed in the inner peripheral surface in the circumferential direction,
The concave groove 3a deforms the obturator 3 as shown in FIG. 3 so as to absorb the vertical force from the outer peripheral direction and reduce the pressing force applied to the inner peripheral surface of the obturator 3 and the inner bottom surface of the annular groove 5a.

Since the frictional force between the inner peripheral surface of the obturator 3 and the inner bottom surface of the annular groove 5a is determined by the normal force and the friction coefficient, the concave groove is formed.
By reducing the normal force by 3a, the frictional force between the two is reduced.

As a result, the relative slip between the obturator 3 and the wing stabilizing bullet 1 increases, so that even if the obturator 3 is rotated by the rifle on the inner surface of the gun, the wing stabilizing bullet 1 is no longer rotated by the obturator 3 and the wing stabilizing bullet 1 during flight Can be reduced in the number of spins.

In addition, the concave groove 3a formed in the inner peripheral surface of the obturator 3
If the combustion gas leaks partially, the gas leaking into the groove 3a will cause the inner surface of the obturator 3 and the annular groove 5a to leak.
Since the space between the inner bottom surfaces is lubricated, the coefficient of friction between the two can be further reduced.

If a plurality of notches 3b are provided in advance on the inner peripheral surface of the obturator 3 at intervals in the circumferential direction as shown in FIG. 4, the bullet 5 is fired from the gun and the outer peripheral surface of the obturator 3 When the gun is released from the restraint on the inner surface, the stress concentrates on each notch 3b due to the gas pressure acting from the inner circumferential surface, and the obturator 3 is broken from these notches 3b. The obturator 3 can be reliably detached.

(Effects of the Invention) As described in detail above, the present invention forms a circumferential groove on the inner peripheral surface of an obturator that prevents gas leakage when a wing stabilizing bullet is fired from a gun. Even if the outer peripheral portion of the obturator cuts into the rifle on the inner surface of the gun and receives a vertical force in the center direction, the concave groove deforms the obturator and absorbs the vertical force, greatly reducing the frictional force between the obturator and the bullet. be able to.

As a result, the relative slip between the obturator and the bullet is improved, so that the rotation of the obturator is less transmitted to the bullet, and the spin rate of the wing-stabilized bullet during flight can be reduced.

In addition, by providing a plurality of notches on the inner peripheral surface of the obturator, stress concentrates on the notch due to the gas pressure acting on the inner peripheral surface during firing, and the notch breaks from the notch.
The obturator can be more reliably released from the fired bullet.

[Brief description of the drawings]

FIG. 1 is a sectional view of a wing stabilizer according to an embodiment of the present invention,
FIG. 2 is an enlarged sectional view of the obturator, FIG. 3 is an explanatory view of the operation, FIG. 4 is a perspective view showing another embodiment, and FIGS. 5 and 6 are explanatory views of a conventional obturator. 1 ... wing stable bullet, 3 ... obturator, 3a ... concave groove, 3b ... notch.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masami Numa 1-2-2, Ikejiri, Setagaya-ku, Tokyo Inside the Defense Agency Research and Development Headquarters (72) Inventor Hidekazu Yoshikawa 3-1-1 Ueno, Hirakata-shi, Osaka (58) Field surveyed (Int. Cl. ⁶ , DB name) F42B 14/02 F42B 12/10

Claims (3)

(57) [Claims] 1. A wing stabilizing bullet 1 in which an obturator 3 for preventing gas leakage during firing by a gun is provided on an outer peripheral portion of a bullet 5 having a wing 6 at a rear portion. Obturator of wing stabilizing bullet formed with concave groove 3a. 2. An obturator having a plurality of notches 3b formed at intervals in a circumferential direction on an inner peripheral surface of an obturator 3 having a concave groove 3a formed on an inner peripheral surface thereof. 3. A method according to claim 1, wherein a part of the gas in the gun can enter into the concave groove 3a of the obturator 3.
The obturator according to (2).