JP2809055B2 - Rocket motor case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocket motor case used for a solid rocket motor.

[0002]

2. Description of the Related Art A rocket motor case 100 shown in FIG.
Is mainly composed of a container 101 made of fiber reinforced plastic formed by a filament winding method, and a boss 102 for attaching fittings is provided on the head of the container 101.
In addition, a boss 103 for attaching a nozzle is provided at the tail of the container 101, and a rubber lining 104, which is a heat insulating material, is attached to the entire inside. Each boss 102, 103 is formed of metal or fiber reinforced plastic.

In addition, this kind of rocket motor case 10
0, the material properties of the container 101 and each of the bosses 102 and 103 are different, and when the internal pressure is applied, stress concentration is likely to occur near the joint portion.
A rubber for stress relaxation (only the head side is shown) 105 is interposed between the first and second rubbers 02 and 103.

[0004] Such a rocket motor case is described in, for example, "Second Edition: Aerospace Engineering Handbook" (Maruzen), pp. 93-934, issued on September 30, 1992.

[0005]

However, in the conventional rocket motor case 100 as described above, a relatively small one can provide sufficient pressure resistance performance, but as the size increases, the container and the boss become larger. 5, the joint between the container 101 and the boss 102 is deformed so as to expand inside the case, as shown in FIG. For this reason, local deformation (indicated by the symbol S) occurs in the inner lining 104 due to the deformation, which may damage the lining 104 or adversely affect the propellant. An improvement in doing so was desired.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and has as its object to improve the pressure resistance of a rocket motor case having a boss on its head or tail.

[0007]

A rocket motor case according to the present invention is provided with a boss for mounting a functional component on a head or a tail of a container, and a rubber lining adhered on the inner side. on the inside,
A configuration is adopted in which a rubber for relative deformation relaxation covering the boundary portion between the container and the boss is attached, and a non-adhesive portion is provided between the rubber for relative deformation relaxation and the lining. And means for doing so.

[0008]

In the rocket motor case according to the present invention, when internal pressure is applied to the case and the joint between the container and the boss is deformed to expand inside the case, the relative deformation covering the boundary between the container and the boss is performed. It is possible to avoid stress concentration in the lining due to the deformation of the rubber for relaxation and the sliding at the non-adhesive portion provided between the rubber for relaxing relative deformation and the lining.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

A rocket motor case 1 shown in FIG. 1 mainly comprises a container 2 made of fiber reinforced plastic formed by a filament winding method, and a boss 3 for attaching joints is provided at the head of the container 2. A boss 4 for attaching a nozzle is provided at the tail of the container 2, and a rubber lining 5 as a heat insulating material is attached to the entire inner side. Each boss 3, 4 is formed of metal or fiber reinforced plastic and has flange portions 3 a, 4 a that enter inside the end of the container 2.

Further, between the container 2 and each of the bosses 3 and 4,
As shown in the enlarged view of FIG. 1 on the head side, a rubber 6 for stress relaxation is interposed in the entire joint portion, and a rubber for cushioning relative deformation covering a boundary portion between the container 2 and the boss inside the case. 7 is affixed, and the rubber 7
Between the lining 5 and the lining 5, a non-adhesive portion 8 is provided over a predetermined range (indicated by the symbol A).

As shown in FIG. 2, the non-adhesive portion 8 is formed by laminating two films 9 of Kapton or the like cut to an appropriate size, It is possible to obtain easily simply by putting it between the rubber 7. The films 9, 9 are bonded to the rubber 7 for relaxing relative deformation and the lining 5, but are not bonded to each other.

Rocket motor case 1 having the above configuration
When an internal pressure is applied, as shown in FIG. 3, the joint between the container 2 and the boss 3 is deformed so as to expand inside the case. At this time, in the rocket motor case 1, both the relative deformations are absorbed by the deformation of the relative deformation relaxing rubber 7 covering the boundary portion between the container 2 and the boss 3, and the relative deformation reducing rubber 7 and the lining 5 In the non-adhesion portion 8 provided therebetween, the slip is caused by the deformation, so that stress concentration does not occur in the inner lining 5.

Therefore, even when the rocket motor case 1 is large and the relative deformation between the container 2 and the boss 3 is relatively large, the lining 5 may be damaged,
There is no fear that the propellant not shown is adversely affected. Further, in the rocket motor case 1, when the container 2 and the boss 3 are relatively deformed, the relative deformation reducing rubber 7 is deformed and locally broken, whereby the relative deformation can be absorbed. Even if it does so, there is no fear that the lining 5 is damaged.

In the above embodiment, the head-side portion has been mainly described. However, the same structure can be adopted also in the tail-side nozzle mounting boss 4.

[0016]

As described above, according to the rocket motor case according to the present invention, the deformation of the rubber for alleviating relative deformation and the slip at the non-adhesion portion are suppressed with respect to the relative deformation generated between the container and the boss. As a result, a large deformation absorbing capability can be obtained, and thereby the pressure resistance of the case can be increased, and the case can be sufficiently applied to a large case.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rocket motor case according to an embodiment of the present invention, with one side omitted, together with an enlarged view of a head portion.

FIG. 2 is a sectional view showing a head portion of the rocket motor case shown in FIG. 1 together with an enlarged view of a non-adhesive portion.

FIG. 3 is a cross-sectional view of a main part illustrating a state in which internal pressure is applied to the rocket motor case shown in FIG. 1;

FIG. 4 is a cross-sectional view of a conventional rocket motor case with one side omitted, together with an enlarged view of a head portion.

5 is a cross-sectional view of a main part illustrating a state where internal pressure is applied to the conventional rocket motor case shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rocket motor case 2 Container 3 Boss 4 Boss 5 Lining 7 Rubber for relative deformation relaxation 8 Non-adhesion part

Claims (1)

(57) [Claims] 1. A rocket motor case having a boss for attaching a functional component on a head or a tail of a container, and a rubber lining affixed to the inside of the case. A rocket motor case having a deformation reducing rubber attached thereto and a non-adhesive portion provided between the relative deformation reducing rubber and the lining.