JP2561738B2 - Ramjet shell - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ramjet projectile using a ramjet propulsion engine as a propulsion means.

2. Description of the Related Art As a ramjet shell of this type, for example, as shown in FIGS. 4 and 5, an ammunition body 32 filled with explosive charge is attached to the front half of a motor case 31, which is the body of a ramjet shell 40.
On the other hand, there is one in which a solid propellant (sustainer propellant) 34 is filled in the combustion chamber 33 at the rear of the bullet 32. 35
Is a nozzle, 36 is a tail, 37 is a nose cone, and an air intake 38 is provided between the tip of the motor case 31 and the nose cone 37 (similar structure is, for example, JANE'S ARMO
UR AND ARTILLERY, 1985-86, 6th edition, P757).

In such a ramjet shell, after being accelerated from a launcher (not shown) by the action of propellant to a predetermined speed at which an effective ram pressure is obtained, the sustainer propellant 34 is ignited and switched to ramjet propulsion. In this ramjet propulsion, the air pressurized by the ram pressure is introduced into the combustion chamber 33 from the air intake 38 to secondarily burn the combustion gas of the sustainer propellant 34, and the combustion gas is injected from the nozzle 35. Get thrust by doing. Then, even if the sustainer propellant 34 burns out, the ramjet shell 40 continues to fly inertially, and eventually hits the target.

DISCLOSURE OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION In a shell using a tom jet propulsion engine as described above, although the range can be extended to some extent, even during so-called inertial flight after the sustainer propellant 34 burns out. Since the intake of air from the air intake 38 is continued, this causes air resistance, and there is a problem that the range does not extend for the capacity of the ramjet propulsion engine. In addition, the increase in air resistance described above means a decrease in the speed at which the shell hits the target. Therefore, the so-called high-energy bullet aimed at destroying the target only by the kinetic energy of the projectile, not by the energy of the explosive charge. Cannot be used as

In other words, high-energy bullets aim to destroy armor equipment, etc. by kinetic energy at the time of collision by hitting a heavy metal bullet with a large mass (for example, tungsten) instead of an explosive-filled bullet. Therefore, if there is a decrease in speed due to the air resistance as described above, the kinetic energy is drastically reduced and the original function as a high energy bullet cannot be exhibited.

The present invention has been made in view of the above problems, and an object thereof is to achieve a sufficient range extension, and to suppress an increase in air resistance during inertial flight, especially as a high energy bullet. To provide ramjet shells ready for use.

Means for Solving the ProblemsA ramjet cannonball of the present invention is equipped with a cranial separable type nose fairing at the tip of a motor case equipped with a combustion chamber for ramjet propulsion. An elastic body having wings is detachably and concentrically supported, and an air intake for taking air into the combustion chamber is formed between the nose fairing and the elastic body. It is characterized in that a separating mechanism is provided which is activated after the operation is finished to separate the motor case from the nose fairing and at the same time to open the nose fairing to separate the nose fairing from the bullet.

Function With this structure, when propelling the ramjet, the combustion gas generated by the combustion of the sustainer propellant and the air pressurized by the ram pressure are mixed in the combustion chamber as in the conventional case, and complete combustion is performed to obtain thrust while flying. To do.

On the other hand, when the sustainer propellant burns out, the ramjet shell will shift to inertial flight, but at that time the separation mechanism is activated, and the motor case and nose fairing that previously functioned as the combustion chamber At the same time as separating the nose fairing, the nose fairing is opened to separate the nose fairing from the bullet. As a result, after that, only the projectile continues the inertial flight toward the target by itself without receiving the air resistance due to the ram pressure.

In this way, after losing the function as a tomjet propulsion engine, by independently flying the bullet independently, the effective range can be extended because the energy loss is small, and at the same time it is sufficiently effective as a high energy bullet. become able to.

Embodiment FIG. 1 and FIG. 2 are configuration explanatory views showing an embodiment of the present invention, 2 is a motor case which is a trunk of a ramjet shell 1, 3 is a nozzle, and 4 is a tail. Motor case 2
A combustion chamber 5 for ramjet propulsion is provided inside,
In this combustion chamber 5, a solid fuel, sustainer propellant 6
Is loaded. A claw-separated nose fairing 7 is detachably connected to the front end of the motor case 2 via a separation mechanism 8.

Inside the nose fairing 7, a solid bullet 9 made of heavy metal (for example, tungsten) having a large mass is arranged. The bullet 9 is provided with a plurality of tails 10. The bullet 9 is held on the axial center of the nose fairing 7 by bringing the end faces of the tails 10 into close contact with the inner peripheral surface of the nose fairing 7. ing. As shown in FIG. 1, the bullet head 9a at the tip of the bullet 9 projects by a predetermined amount from the front end face of the nose fairing 7, and as long as the bullet 9 is connected and supported by the motor case 2, The bullet head 9a of this will function as the nose cone of the ramjet shell 1.

A diffuser 11 communicating with the combustion chamber 5 is formed between the nose fairing 7 and the bullet 9, and a front end of the diffuser 11 is opened as an air intake 12.

As shown in FIG. 2, the separation mechanism 8 is composed of a pair of separation bands 13 and 13 connected to each other via a link 12, and a fastening member composed of an explosion bolt 14 and a nut 15 which are pyrotechnics. And a pair of separation bands 13,1 wound around the joint 16 between the motor case 2 and the nose fairing 7.
The motor case 2 can be mounted by tightening the explosive bolt 14 and nut 15 together after the 3 ends are abutted against each other.
And the nose fairing 7 are firmly fixed. 17,1
Reference numeral 8 is a rectifying cover that covers the explosive bolt 14 and the nut 15, and the connecting portion by the link 12, respectively.

In the ramjet shell 1 configured as described above, when the ramjet is propelled, the combustion gas generated by the combustion of the sustainer propellant 6 and the air that is pressurized by the ram pressure and taken in from the diffuser 11 are used as in the conventional case. Are mixed and completely burned, and the combustion gas is injected from the nozzle 3 to obtain a propulsive force and the ramjet shell 1 continues to fly toward the target.

On the other hand, when the sustainer propellant 6 is completely burned, the ramjet propelling force cannot be obtained, but the ramjet shell 1 continues to fly due to inertia. And
When the ram combustion of the sustainer propellant 6 is completed, the explosion bolt 14 of the separation mechanism 8 is activated at a predetermined timing by the operation of a timer or the like, and the binding force of the separation bands 13, 13 by the explosion bolt 14 and the nut 15 is released. It

When the restraint force of the separation bands 13 and 13 is released, the separation bands 13 and 13 are separated from the motor case 2 and the nose fairing 7, and at the same time, the binding force between the motor case 2 and the nose fairing 7 is released. . As a result, as shown in FIG. 3, the nose fairing 7 and the motor case 2 are separated from each other, while the nose fairing 7 itself is also separated and cleaved into, for example, four block pieces, and the ammunition body 9 is replaced by the nose fairing 7. Separated from. As a result, the bullet 9 will continue to fly toward the target by inertia.

In the above embodiment, the so-called high-energy bullet type using a heavy metal solid structure as the bullet 9 is illustrated, but an explosive charge is loaded into the bullet 9 as needed. It is also possible.

As described above, according to the present invention, after the ram combustion is completed, the motor case and the nose fairing are separated, and at the same time, the nose fairing is opened to separate the nose fairing from the projectile. By allowing only the single body to fly independently, the range of the bullet can be sufficiently extended because the ram pressure does not affect the air resistance when the ammunition body is flying alone. In addition, the loss of kinetic energy of the ammunition is small because the influence of the air resistance due to the ram pressure is eliminated as described above. Especially, it is more than enough for a so-called high energy ammunition that uses a heavy metal heavy mass as the ammunition. Will be applicable to.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of a ramjet shell of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a separation of the ramjet shell of FIG. FIG. 4 is a structural explanatory view showing a state after the operation, FIG. 4 is a structural explanatory view showing an example of a conventional ramjet shell, and FIG. 5 is an enlarged sectional view of an essential part of FIG. 1 ... Ramjet shell, 2 ... Motor case, 5 ...
… Combustion chamber, 6… Sustainer propellant, 7… Nose fairing, 8… Separation mechanism, 9… Ammunition, 12… Air intake, 13… Separation band, 14… Explosion bolt.

Front page continuation (72) Haruo Shimizu Inventor Haruo Shimizu 2 Takaracho, Kanagawa-ku, Kanagawa Prefecture Nissan Motor Co., Ltd. (56) Reference JP-A-2-150700 (JP, A) , U) Sukeko 38-21800 (JP, Y2)

Claims (1)

(57) [Claims] 1. A claw-separated nose fairing is attached to the tip of a motor case having a combustion chamber for propelling a ramjet, and a bullet having a wing can be separated inside the nose fairing. Concentric support is provided to form an air intake between the nose fairing and the ammunition for taking in air into the combustion chamber, and further, it operates after completion of ram combustion to operate with the motor case and nose. A ramjet shell that is provided with a separating mechanism that separates the nose fairing from the fairing and at the same time opens the nose fairing to separate the nose fairing from the bullet.