JP2685427B2 - Spring material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring material used in combination with a gas generator such as an automobile airbag, an injection device for an emergency escape seat of an aircraft, an emergency opening / closing device for a valve, and a buoyancy generator for a ship. It is a thing.

[0002]

2. Description of the Related Art As a gas generator of this type, a method of using a high temperature gas generated by burning explosive in an explosive chamber is widely adopted. For this purpose, it is necessary to fill the explosive chamber with explosive such as sodium azide (NaN ₃ ), but in the case of a gas generator for an air bag of an automobile, for example, the explosive may be damaged by vibration during traveling. In order to prevent accidental ignition due to movement, it is necessary for the explosive powder to be supported by a spring material in the explosive chamber so as to be supported and built therein.

The spring material for this purpose has a simple structure, can be used as an annular explosive chamber lid to support and prevent vibration of the explosive, and has a spring constant in an appropriate range to prevent resonance. Many characteristics are required, such as being lightweight, having no decrease in elastic force even after long-term use, and having the effect of cooling high-temperature gas. Conventional coil springs, etc. It could not be used as a lid and was unsuitable in terms of the cooling effect of high temperature gas.

Further, as disclosed in Japanese Patent Laid-Open No. 63-93440, there is a spring material in which an external force is applied to the entire metal wire to give "twist", and then the wire is compressed and pressed. However, this spring material has a low entanglement among the wire materials, and there is a high possibility that the spring material will gradually disintegrate due to vibration or other external force applied during use, and there is a drawback that the usable place is limited. That is, it is desirable that the place where this spring material is arranged is a closed space, and that there is a condition where the shape of the spring material can be maintained by external regulation.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and can be used as a cover for an explosive chamber, has a cooling effect for high-temperature gas, and has a spring constant in an appropriate range. A new spring material that is lightweight, has no decrease in elastic force even when used for a long period of time, has a strong degree of entanglement, has a high self-holding property of shape, and can be used at any place even in a closed space. It has been completed to provide.

[0006]

Means for Solving the Problems The above-mentioned problems have been solved by providing a spring for pressing explosives, which is disposed in the combustion gas flow path of explosives in the explosive chamber of a gas generator for burning explosives to generate gas. The material is a compressed aggregate of three-dimensional wave-shaped metal wire that is bent in two different directions into wave shapes with different pitches, innumerable small waveforms are repeatedly formed, and is bent in a three-dimensional direction as a whole. It can be solved by a spring material characterized in that the whole is in a state of being compression-molded into a disc spring shape, a cylindrical shape or a column shape.

[0007]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention will be described below. FIG. 1 shows one embodiment of the spring material of the present invention, the overall shape of which is a disc spring shape corresponding to the size of the explosive chamber, for example, outer diameter D ₂ = 75 mm, inner diameter D ₁ = 50 mm,
The height H is 7 mm and the wall thickness t is 2 mm. As will be described later, the spring material of this embodiment is a compression assembly formed by intertwining intricate three-dimensional wave-shaped metal wire rods that are bent in two different directions into wave shapes having different pitches. It is compression molded into a spring shape.
In this embodiment, the metal wire has a wire diameter of 0.25 to 0.
45mm stainless steel wire for spring (JIS G 4314 SUS304-WP
B) is used. If the wire diameter of the metal wire is too thin,
The spring constant required for this type of spring material shown in FIG. 2 cannot be obtained, and if it is too thick, the necessary spring constant cannot be obtained and the weight becomes large.

Next, a method for manufacturing the spring material of the present invention will be illustrated. First, as shown in FIG. 3, the metal wire 1 first passes between a pair of first gears 2 and 2 that mesh with each other, and is bent in one direction in a wavy shape (planar waveform) at a constant pitch in one direction. This first gear 2 has its module 4.0-1.0.
Spur gears are suitable. Next, the metal wire 1 passes through the guide 3 and between the pair of second gears 4 and 4 meshing with each other. When passing through the second gears 4 and 4, innumerable small waveforms are repeatedly formed by bending in a different direction with respect to the bending surface in a three-dimensional shape, and a complicated three-dimensional waveform is formed in a three-dimensional manner as a whole. To be done.

The second gear 4 has its module from 2.0 to
It is a spur gear set to 0.5, and by making the module of the second gear 4 smaller than the first gear 2 in this way, it is possible to bend at different pitches from two different directions, especially in the three-dimensional direction as a whole. The bent metal wire 1 can be obtained. The ratio of the module M1 of the first gear 2 to the module M2 of the second gear 4 is preferably M1 / M2 = 1.5 to 2.5. In this embodiment, the bending pitch is 5 to 10 m.
The height of the wave is 3 to 6 mm. By using such a three-dimensional wave-shaped metal wire rod 1 material, the bulk density after compression molding can be made uniform and the spring characteristics can be improved, and the entanglement of the metal wire rod 1 can be strengthened and the shape self-holding property can be improved. You can

Next, the metal wire 1 is continuously wound on a drum, bent into a band of a constant width, or cut into short pieces and stacked in a predetermined shape, as shown in FIG. Stacked metal wire 1
It is considered as an aggregate 5 of. Even in this state, the metal wire rods 1 formed in the above-described three-dimensional wave shape are already entangled with each other and have a certain shape retention property. Here, however, the annular portion of the assembly 5 obtained by winding on a drum is used. As shown in the drawing, a metal fastening wire rod 6 is further wound around the circumference of and is fastened to a predetermined shape to improve shape retention. However, the use of the fastening wire rod 6 is not always necessary.

The aggregate 5 of the metal wire rods thus obtained is then formed into an annular upper die 7, a core die 8, an outer die 9, as shown in FIG.
It is housed in a first mold 11 composed of a push-up mold 10 and is primary compression molded in an annular shape. At this time, as shown in the figure, an annular elastic ring 1 made of urethane rubber or the like is formed on the upper surface of the assembly 5.
If 2 is applied and compression molding is performed by the upper mold 7, the metal wire rod 1
May get out of the gap between the molds and damage the mold 11,
It is possible to prevent generation of defective products.

After performing the primary compression molding in this manner, the secondary compression is further performed by the second mold 13 including the upper mold 7a, the core mold 8, the outer mold 20, and the protruding mold 21 as shown in FIG. Molding is done. As a result, the intended disc spring-shaped spring material can be obtained. Bulk specific gravity after compression molding is 0.5 to 3.0
Is preferred. It is also possible to further wind the fastening wire rod 6 around the primary compression molded product or to perform groove processing on the outer peripheral surface and then perform the secondary compression molding. Further, although the primary compression molding and the secondary compression molding are performed in this description, the secondary compression molding may be omitted depending on the shape, structure and application of the spring material.

FIG. 7 shows an example of use in which the spring material of the present invention is incorporated into a gas generator for an automobile air bag. In the figure, a partition wall 16 provided inside the casing 15
The inside of the ignition chamber 17 is filled with an igniter 18 and an igniting agent such as phosphorus nitride, and the inside of the explosive chamber 19 outside the partition 16 is filled with explosive such as sodium azide (NaN ₃ ). Has been done. The spring material of the present invention is fitted in two steps in the upper part of the explosive chamber 19, and the spring material in the lower step is a lid for supporting the explosive in the explosive chamber 19 or an elastic material, which has homogeneity and appropriate elasticity. It has advantages such as longevity, easy adjustment of spring characteristics, light weight, and no decrease in elastic force even after long-term use. There is no fear and there are advantages such as high cooling effect. The upper spring material also effectively acts as a cooling material and an elastic material.

[0014]

As described above, the spring material applied to the gas generator of the present invention is a compression molded body in which the metal wire rods described above are intimately entangled with each other, and therefore the shape thereof is It has a high self-holding property and has a simple structure, so that it can be easily loaded into the casing. The metal wires are intimately entwined with each other and have suitable elasticity for proper adjustment, and they are highly vibration-proof when supporting explosives, and are lightweight and have a low elastic force even after long-term use. There is no
As a spring material, it has high long-term stability, there is no risk of short-circuiting of gas due to uneven density, and the cooling effect of high-temperature gas is high. As described above, the present invention, as a spring material that solves the conventional problems, has a great contribution to the industrial development.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a spring material of the present invention.

FIG. 2 is a graph showing an example of required spring characteristics.

FIG. 3 is a perspective view showing a bending process of the metal wire.

FIG. 4 is a perspective view showing an assembly of metal wires.

FIG. 5 is a sectional view showing a primary compression molding process.

FIG. 6 is a sectional view showing a secondary compression molding process.

FIG. 7 is a cross-sectional view showing a usage example in which the spring material of the present invention is incorporated into a gas generator for an automobile airbag.

[Explanation of symbols]

 An assembly of 1 metal wire rod and 5 metal wire rods.

Claims (1)

(57) [Claims] 1. A spring material for pressing explosives, which is disposed in a combustion gas flow path of explosives in a pyrotechnic chamber of a gas generator for burning explosives to generate gas from two different directions. Each is bent into a wavy shape with a different pitch, and innumerable small waveforms are repeatedly formed.
A spring material comprising a compression assembly of three-dimensional wave-shaped metal wires bent in a dimensional direction, and the whole being compression-molded into a disc spring shape, a cylinder shape, or a column shape.