JPH0666496A - Cannon barrel with low reaction - Google Patents

Abstract

PURPOSE:To cause a position of a cannon barrel to be hardly discovered by a method wherein when a bullet is launched, a discharging of launching gas is delayed. CONSTITUTION:When a launching bullet 3a completes its combustion, a main body 1a of a cannon near a rear end of a bullet 2 is formed with a launching gas discharging part 1b. The launching gas discharging part 1b is covered by an outer cylinder having a front end fixed to an outer surface of the main body 1a of the cannon so as to define a launching gas glowing passage 4a communicating from a launching gas discharging part 1b reawardly and having its rear end opened. Due to this fact, combustion of not-yet ignited launching gas outside the bullet is restricted when the bullet 2 is launched. Along with this operation, explosion wind is reduced and its safety characteristic is improved, resulting in that a degree of freedom of arranging of army groups can be increased and a position of the cannon can be hardly discovered by enemy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low recoil barrel mainly used for an anti-tank barrel.

[0002]

2. Description of the Related Art In general, when a bullet is fired from a gun, the barrel receives a reaction force from the firing gas and moves in a direction opposite to the traveling direction of the bullet. In order to prevent this, the fire gas that escaped backwards and did not generate reaction force is a recoilless gun.

As a conventional recoilless gun, for example, one shown in FIG. 3 is known. Launch charge 1 inserted in the case 13
When 3a is ignited, it rapidly burns to generate a propellant gas, and the pressure of the gas accelerates the bullet 2 in the barrel 10. At the same time, the barrel 10 tries to start moving backward due to the recoil, but a part of the firing gas is discharged from the firing gas discharge part 13b provided in the cartridge case 13 to the skirt portion 1 on the rear side of the barrel 10.
0b, and the discharge gas discharge part 10a on the rear surface of the barrel 10
Emitted from. As a result, the reaction force acting on the barrel 10 is canceled.

[Problems to be Solved by the Invention]

However, such a conventional recoilless gun has a structure in which the projecting gas discharge portion 13b is provided in the cartridge case 13, so that the ignition charge 13a is not generated in the cartridge case 13 by ignition. Combustion propellants are emitted from behind the barrel 10. This unburned propellant gas burns rapidly after release, producing a blast, which is unsafe and the troops cannot be placed in the rear blast zone. Moreover, since the dust blows up greatly by the blast, there is a problem that the position of the gun can be easily detected by the enemy. In addition, since the propellant gas is released from the discharge part 10a early and the pressure of the propellant gas is lowered,
A large amount of propellant charge 13a is required to fire the bullet 2.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems, and its construction is such that it is fired into a barrel having a cylindrical barrel body whose bottom is closed. A low-reaction gun barrel equipped with a charge and a bullet and firing the bullet by burning the launch charge, the barrel body being near the rear end of the bullet when the launch charge finishes burning, The projecting gas discharge part is formed, and the projecting gas discharge part is covered by an outer cylinder having a front end fixed to the outer surface of the barrel body, and the projecting gas discharge part is communicated rearward to open the rear end. It is a low recoil barrel characterized by defining a launch gas flow passage.

[0006]

[Function] With the gunpowder charge and bullets attached to the barrel,
When the propellant charge is ignited, it produces a propellant gas, and the bullet is fired from the barrel. Since the bottom of the barrel is closed in the mounted state of the bullet, the bullet is effectively received by the pressure of the firing gas and is accelerated.

When the bottom of the bullet passes through the propellant gas discharge part, part of the propellant gas due to the combustion of the propellant charge is discharged from the propellant gas discharge part formed in the barrel body. The propellant gas discharged from the propellant gas discharge portion is guided to the propellant gas flow passage defined between the barrel body and the outer cylinder, flows backward, and is ejected to the outside from around the bottom of the barrel. Since the propellant gas discharge part is formed on the barrel that is near the rear end of the bullet when the propellant charge finishes burning in the barrel, the propellant gas discharge part and by extension, the ejection from the rear side of the barrel The gas contains little unburned gas.

In this way, the unburned propellant gas in the barrel is not immediately discharged, but is temporarily stored inside, and when the propellant charge reaches a state where it almost finishes burning, the propellant gas discharge part of the barrel As it is released, it ejects toward the rear side of the barrel, so it is good that a large amount of unburned propellant gas is released and then burns rapidly, resulting in loss of gas pressure and blast. To be avoided. In addition, the reaction gas generated by the firing gas when the bullet is fired is appropriately reduced by the firing gas ejected from the rear side of the barrel.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a low recoil barrel according to the present invention. In the barrel 1, the bottom portion 1c of the barrel-shaped barrel body 1a is closed, and the front end portion forms a muzzle 1d. The inner bottom portion of the barrel 1 forms a shell case 3, and the shell case 3 is attached with a fire tube 3b. In addition, in the vicinity of the shell case 3,
No opening is formed through which the propellant gas is discharged. The bullet 2 has the gun barrel body 1 after the launch charge 3a is inserted into the cartridge case 3.
It is mounted in a as indicated by a virtual line.

A propellant gas discharge portion 1b is bored at a position spaced from the bottom portion 1c of the barrel body 1a by an appropriate distance. As shown in FIG. 2, a plurality of the discharge gas discharge portions 1b are formed as long holes extending in the front-rear direction (center axis direction) of the barrel body 1a at equal intervals in the circumferential direction, and the rear side surface 1e is formed on the barrel body. The inclined surface is formed so as to guide the air flowing out from 1a to the rear side (left side in FIG. 1). Such a propellant gas discharge part 1b is formed by penetrating the barrel main body 1a near the rear end of the bullet 2 reaching the position shown by the solid line in FIG. 1 when the propellant charge 3a finishes burning. is there. The projectile gas discharge portion 1b is located in front of the bullet 2 in a state in which the bullet 2 having the normal length is mounted in the barrel 1 before the firing.

Further, an outer cylinder 4 for airtightly fixing the front end portion is provided on the outer surface of the barrel main body 1a. The outer cylinder 4 covers the emission gas discharge portion 1b, and the emission gas discharge portion 1b communicates rearward. The annular emission gas flow passage 4a is defined. Outer cylinder 4
Is formed by slightly projecting rearward from the bottom portion 1c of the barrel 1, and the firing gas flow passage 4a is open to the outside around the bottom portion 1c of the barrel 1. The outer cylinder 4 is provided with a plurality of ribs 4b between the outer cylinder 4 and the bottom portion 1c to improve the mounting strength.

Next, the operation of the above embodiment will be described. If the firing charge 3a is inserted into the cartridge case 3 of the barrel 1 and the bullet 2 is mounted inside the barrel body 1a, if the firing charge 3a is ignited by the fire tube 3b, a firing gas is generated, and the bullet 2 Fired from barrel 1. When the bullet 2 is mounted, the bottom 1c of the barrel 1 is closed and no opening such as a discharge gas discharge portion is formed near the shell case 3. Therefore, the bullet 2 effectively receives the pressure of the discharge gas. Be accelerated. At that time, the air existing on the front side of the bullet 2 flows out from the muzzle 1d of the barrel main body 1a and at the same time, the projecting gas discharge portion 1b located in front of the bullet 2 is discharged.
Also partly leaked from.

The bottom of the bullet 2 is the ejected gas discharge section 1
After passing b, a part of the propellant gas generated by the combustion of the propellant charge 3a is discharged from the propellant gas discharge part 1b formed in the gun barrel main body 1a at a regular interval in the circumferential direction. The propellant gas discharged from the propellant gas discharge part 1b is guided to the annular propellant gas flow passage 4a defined between the barrel body 1a and the outer cylinder 4, flows backward, and from the periphery of the bottom part 1c of the barrel 1. Eject outside. In the propellant gas discharge part 1b, the propellant charge 3a is the barrel 1
When the combustion is completed inside, since it is formed on the barrel 1 near the rear end of the bullet 2, the unburned gas is emitted to the ejected gas discharge portion 1b and hence the ejected gas from the rear side of the barrel 1 to the outside. Very little is included. Also, the discharge gas discharge part 1b
Since the rear side surface 1e is formed as an inclined surface, the propellant gas is guided to the propellant gas flow passage 4a while being guided rearward.

In this way, the unburned propellant gas generated in the barrel 1 is not immediately discharged but is temporarily stored in the barrel 1, and the propellant charge 3a has reached a state where it has almost finished burning and is not burned. After the emission gas is remarkably reduced, it is released from the emission gas discharge portion 1b of the barrel 1 and ejects toward the rear side of the barrel 1. Therefore, a large amount of unburned emission gas is released, and thereafter, it rapidly burns, Good avoidance of gas pressure loss and blast is avoided. In addition, since the outer cylinder 4 is formed so as to slightly project rearward from the bottom portion 1c of the barrel 1, and the discharge gas flow passage 4a is formed to be long, the discharge gas ejected from the rear side of the barrel 1 to the outside can be well directed. Sex is given,
Deterioration of the surrounding environment due to the scattering of the shot gas is favorably suppressed, and the reaction caused by the shot gas generated in the barrel 1 when the bullet 2 is shot from the barrel 1 is appropriately reduced.

[0015]

As can be understood from the above description,
According to the low recoil barrel according to the present invention, when the bullet is fired, the emission of the unburned emission gas is suppressed by delaying the emission of the emission gas, so that the combustion of the emission gas after emission is suppressed. As a result, the blast is reduced and the safety is excellent, the freedom of placement of the unit is increased, and the fact that the blast blows a large amount of dust so that the position of the gun is difficult to be found by the enemy Is obtained.
In addition, since the propelling gas is released from the propelling gas discharge portion, a forward propulsive force is generated in the barrel, so that the recoil of the barrel at the time of firing can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a low recoil barrel according to an embodiment of the present invention.

FIG. 2 is a half sectional view taken along line II-II of FIG.

FIG. 3 is a longitudinal sectional view showing a conventional recoilless gun.

[Explanation of symbols]

1: Barrel, 1a: Barrel body, 1b: Ejection gas discharge part, 1
c: bottom, 1d: muzzle, 1e: rear side, 2: bullet, 3:
Shell case 3a: launch case, 3b: fire tube, 4: outer cylinder, 4a:
Launch gas flow passage.

Claims (1)

[Claims] 1. A low-reaction barrel that has a gun barrel body having a cylindrical bottom portion with a closed bottom and is equipped with a propellant charge and a bullet, and fires the bullet by burning the propellant charge. A discharge gas discharge part is formed in the barrel body near the rear end of the projectile when the propellant charge finishes burning, and the discharge gas is discharged by an outer cylinder that secures the front end part to the outer surface of the barrel body. A low-reaction gun barrel characterized in that a firing gas flow passage which covers a portion and communicates rearward from the firing gas discharge portion and whose rear end is open is defined.