JPH051044B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a gas generator used for inflating a buoyancy generation bag, for emergency opening/closing of a valve, for emergency seat injection, etc. The present invention relates to a filter and a method for manufacturing the filter.

[Conventional technology]

For this type of gas generator, a system that uses high-temperature gas generated by burning gunpowder is widely adopted, but in order to avoid damage such as bugs, it is necessary to cool the gas and collect harmful components in the gas. Therefore, it is necessary to use a filter. As this filter, for example, as disclosed in Japanese Patent Application Laid-Open No. 51-60333, a cooling chamber filled with straight metal wires or metal rods, or a stainless steel wire mesh (plain weave product) placed inside the casing. Laminated multiple sheets cut to size, steel wool,
Various materials are used, including metal, ceramic foam, and metal baffle plates.

[Problem to be solved by the invention]

However, among the above-mentioned filters, the straight metal wire or metal rod has no elasticity, so a gap is created between it and the casing, allowing gas to pass through.
Another disadvantage is that it takes time and effort to set up and is bulky. In addition, since the wire mesh has little elasticity, it is easy to cause the above-mentioned shot pass, and loading is time-consuming because 20 to 300 meshes are stacked alternately.
Furthermore, steel wool is easily eroded by high-temperature gases and is expensive; foam materials have no elasticity, poor breathability, and are expensive; baffle plates have a complicated structure, require large equipment, and are not effective at capturing harmful products. It had various drawbacks, including inferior performance.

This invention solves the above-mentioned conventional drawbacks,
An object of the present invention is to provide a small and useful filter for a gas generator that is easy to attach to a gas generator and can prevent gas short passes, melting and deterioration of air permeability, and a manufacturing method that allows the filter to be manufactured through a simple process. It is something to do.

[Means to solve the problem]

However, the filter of this invention has a wire diameter of 0.1 to 1.5.
This is a gas generator filter with a bulk specific gravity of 1.0 to 3.0, which is made by laminating and compression-molding a bending line material made of heat-resistant steel wire with a thickness of 1.5 mm and bent into a wave or coil shape into an annular shape.

Further, the first method for manufacturing the filter of the present invention includes:
It is characterized by bending heat-resistant steel wire with a wire diameter of 0.1 to 1.5 mm into a wave or coil shape, wrapping the resulting bent line material around a cylindrical body to form an annular laminate, and compression molding this laminate into an annular shape. This is a method for manufacturing a filter for a gas generator.

Further, a second method for manufacturing a filter of the present invention includes:
Heat-resistant steel wire with a wire diameter of 0.1 to 1.5 mm is bent into a wave or coil shape, the resulting bent line material is wound around a cylindrical body to form an annular laminate, and this laminate is compression-molded into an annular shape for primary forming. A method for manufacturing a filter for a gas generator, characterized in that a fastening material is wrapped around the cross section of the primary molded product, and then the wrapped primary molded product is further compression molded into an annular shape. .

Further, a third method for manufacturing a filter of the present invention is as follows:
A heat-resistant steel wire with a wire diameter of 0.1 to 1.5 mm is bent into a wave or coil shape, the resulting bent line material is wound around a cylindrical body to form an annular laminate, and this laminate is compression-molded into an annular shape to form the outer periphery. This is a method of manufacturing a filter for a gas generator, characterized by forming a plurality of grooves extending in the axial direction.

In the present invention, various heat-resistant steel wires such as stainless steel wire, nickel alloy steel wire, and cobalt alloy steel wire can be used as the heat-resistant steel wire. If the wire diameter of this heat-resistant steel wire is less than 0.1 mm, there is a risk of melting damage, and if it exceeds 1.5 mm, the processing resistance during bending and compression molding will be excessive, and the gap for gas flow will be excessive.
This is not preferred because the gas cooling effect and harmful component trapping effect are poor. As this heat-resistant steel wire, a long wire rod drawn through a normal die can be used, but it is also possible to use a rotating water-cooled disk that scrapes off a small amount of molten steel by bringing it into contact with the surface of the molten steel. It is preferable to use a short wire rod with a length of about 50 to 300 mm, which is produced by a method called melt extraction method in which the wire rod is accumulated laterally, since the material cost is low.

In the present invention, the bent line material obtained by bending heat-resistant steel wire into a wave shape may be of various waveforms, such as a sinusoidal waveform or a curved waveform similar to this, or a bent straight waveform such as a sawtooth wave or a rectangular wave. As shown in Figure 3, if the waveform pitch P is 5 to 10 mm and the wave height H is 3 to 6 mm, the gap between the lines of the compression molded product will not become excessive, and Because it is well integrated by moderate intertwining,
Particularly preferred. In addition, the wavy bending process to obtain the bending line material involves bending the wire rod only once to form a wavy bending process (plane wave process) in only one direction (for example, the front-back direction). If the bent line material is bent in a wave shape in multiple directions (stereo wave processing) by bending the bending process in different directions multiple times, such as bending it in a wave shape in another direction (for example, the left-right direction), the bent line material It is particularly preferable because it is easy to become entangled in the subsequent winding and compression process, and a filter with less deformation and good dimensional accuracy can be obtained, as well as having uniform internal gaps and less directional properties. When performing wavy bending multiple times in this way, it is best to change the pitch by making the bending pitch in the subsequent process smaller than the bending pitch in the previous process.If the pitches are the same or similar, the wire rod This is not preferable because it becomes twisted and makes it difficult to perform the bending process in the subsequent process.

In addition, in this invention, the bending material made by bending heat-resistant steel wire into a coil shape has a pitch of 1 to 5.
It is particularly preferable to use a material with a pitch circle diameter of 3 to 6 mm because the gap between the lines of the compression molded product will not become excessive and the material will be well integrated due to appropriate intertwining.

Further, in the present invention, the bulk specific gravity of the filter can be adjusted by compression molding, but if the bulk specific gravity is less than 1, the filter becomes bulky and large, and if the bulk specific gravity exceeds 3, the ventilation resistance becomes excessive, which is not preferable.

[Effect]

Since the filter for a gas generator of the present invention is a compression molded product of a bending member made of heat-resistant steel wire, it has elasticity and adheres closely to the inner wall surface of the casing when it is attached to the casing. In addition, the curved line members are intertwined with each other to form a single body, which prevents deformation and is easy to handle.

In addition, the filter having the above structure and function is
The manufacturing method of this invention allows efficient manufacturing.

Further, according to the second manufacturing method (claim 3) of the present invention, after the fastening material is wrapped around the primary molded product, it is further compressed into an annular shape, so that the fastening material prevents the molded product from unraveling in the obtained filter. Furthermore, even when using a short bent line material, the ends of the wire are prevented from protruding outward, and a filter that is easier to handle with less deformation can be obtained.

Further, according to the third manufacturing method (claim 4) of the present invention, an annular filter having a plurality of grooves extending in the axial direction on the outer periphery can be obtained by only a compression molding process without any troublesome manual work. Since this groove was formed by local compression,
The molded product is prevented from unraveling, and even when a short bending member is used, the ends of the wire are prevented from protruding outward, and a filter that is easier to handle with less deformation can be obtained.

〔Example〕

1 and 2 below, the first embodiment of the present invention will be described.
An example will be explained.

First, a long stainless steel wire (heat-resistant steel wire) 1 with a wire diameter of 0.4 mm manufactured by drawing with a normal die is wound around a round bar 2 and bent in the same way as forming a spiral spring. 3mm, pitch circle diameter 5
A bent line material 3 of mm was obtained. [Fig. 1a] This bending member 3 is wound around a rotating cylindrical body 4 [Fig. By molding, an annular filter 8 having a bulk specific gravity of 1.5 was obtained. [Image c,
d] The upper mold 6 has a cylindrical shape with holes, and the lower mold 7
has a cylindrical outer mold 7a, a rod-shaped inner mold 7b,
It consists of a perforated disk-shaped bottom plate 7c that can be raised and lowered.

The obtained filter 8 is press-fitted into the annular cooling filtration chamber 11a of the casing 11 of the gas generator 10, as shown in FIG. 2, and the cap 12 is attached thereto. Since the filter 8 has elasticity and is integrally molded so that it does not lose its shape, it can be easily loaded into the casing 11 with one touch. When the gas generating agent 14 loaded in the combustion chamber 13 is ignited by the igniter 15, the gas generating agent 14 explodes and burns to generate high temperature gas, which passes through the filter 8 through the vent hole 16. After cooling and collection of harmful products, the gas is ejected from the gas ejection port 17 and supplied to the gas utilization side such as an air bag.

Next, FIG. 4 shows a second embodiment of the present invention, in which the wire diameter was manufactured by the melt extraction method.
A gear 22 that meshes with a stainless steel wire (heat-resistant steel wire) 21 with a clearance of 0.8 mm and a length of 250 to 300 mm,
22, with a pitch of 7 mm and a wave height of 4.
A bent line material 23 of mm was obtained. [FIG. 4a] This bending member 23 is wound around the same rotating cylindrical body 4 as in the previous example [FIG. The filter 27, which is the final product, is compression molded using a mold consisting of
The annular primary molded product 25 has a height H greater than that of the first molded product 25. [Figures c and d] Next, several separately prepared bent line members are wrapped around the cross section of the primary molded product as a fastening member 26 to prevent it from unraveling. [Figure d] This wrapped primary molded product was further compression molded using a mold consisting of an upper die 6 and a lower die 7 [Figure e] to obtain an annular filter 27 with a bulk specific gravity of 1.5. . [FIG. f] In the obtained filter 27, the fastening material 26
surrounds the bent line material 23 to prevent it from unraveling, and also suppresses the wire end of the relatively short bent line member 23 from protruding outward, making it difficult to lose its shape and easy to handle.

Next, FIG. 5 shows a third embodiment of the present invention, in which the same stainless steel wire 1 as in the first embodiment is bent in the left and right direction using gears 22, 22, which are the same as in the second embodiment. Primary bending line material 3 with wave height 4mm
1a, the primary bending line material 31a is further bent in the front-rear direction with a pitch of 3.4 mm and a wave height of 2 mm using gears 32 and 32 having an axis perpendicular to the gear 22 disposed on the lower stage side. A bent line material 31 bent in a wavy manner was obtained. [FIG. 5a] This bending member 31 is wound around the same rotating cylindrical body 4 as in the first embodiment [FIG. A ring-shaped filter 34 having a bulk specific gravity of 1.5 was obtained by compression molding using a mold consisting of: [Figures c and d] In the obtained filter 34, the bent line members 31 are sufficiently intertwined, so that it is less likely to lose its shape than that of the first embodiment, and has good dimensional accuracy, and the gaps between each part are more uniform and directional. It was a filter with little sexiness.

Next, FIGS. 6 to 8 show a fourth embodiment of the present invention, in which the same stainless steel wire 21 as in the second embodiment is subjected to the same bending process [FIG. 6a] and a cylindrical body. 4 [see figure b],
The obtained annular laminate 24 was compression-molded using the same mold as in the second example to obtain an annular primary molded product 25. [C and d in the same figure] Next, as shown in FIG. 6 e, FIG. 7, and FIG. 6)
An outer mold 42a with a protrusion 41 protruding from it, a rod-shaped inner mold 42b, and the outer mold 42a and the inner mold 42b.
a lower die 42 consisting of a bottom plate 42c that fits into the bottom plate 42c and can be raised and lowered; and a cylindrical body with a hole in which a groove 43 that fits into the protrusion 41 is formed on the outer peripheral surface that fits into the inner wall surface 40. using the upper die 44 of the primary molded product 2.
5 compression molding was performed. [FIG. 6e] That is, the primary molded product 25 is charged into the upper part of the lower mold 42,
The upper die 44 is pressed down to push the primary molded product 25 downward and compress it in the axial direction, and the outer circumference of the primary molded product 25 is locally compressed by the protrusions 41, so that six axially extending rods are formed on the outer circumference. A filter 46 having grooves 45 was obtained. [Figure f] In this filter 46, the concave groove 45 formed on the outer periphery prevents the bent line material 23 from unraveling, and also suppresses the wire ends of the relatively short bent line material 23 from protruding outward. It is hard to lose its shape and is easy to handle.

The present invention is not limited to the above embodiments; for example, in the above embodiments, the laminates 5, 2
Although compression molding in Nos. 4 and 33 was performed by compression only in the axial direction (vertical direction), compression may be performed in the radial direction as well as in the axial direction. Further, when forming the groove 45, the entire circumference may be compressed in the radial direction at the same time, or the groove 45 may be formed by using another type of mold, such as pressing in the radial direction with a claw-shaped mold. It may also be formed by compression molding. Furthermore, in the fourth embodiment, the laminate 2
The groove 45 was formed by locally compressing the outer periphery of the primary molded product 25 obtained by compression molding 4. Instead, the laminate 24 was directly charged into the lower mold 42, and the lower mold 42 and the upper mold were Compression molding may be performed using the mold 44 to obtain an annular filter 46 having a groove 45 on the outer periphery; in this case, the primary molding step is omitted and the process is simplified. Further, as the fastening material 26 to be wrapped around the primary molded product, a straight wire rod or a cylindrical wire mesh 50 as shown in FIG. It may be wound more than that. Further, in the third embodiment, the second
The same primary forming as in the example, wrapping of the fastening material, and compression forming again may be performed. Furthermore, the present invention can also be applied to a filter for an axial flow type gas generator in which high-temperature gas flows in the axial direction of the annular body.

〔Effect of the invention〕

As explained above, the filter of the present invention is a compression molded product of a curved material, is small in size, has elasticity,
It is easy to install on a gas generator, prevents short gas passes, and allows you to select the wire diameter of the heat-resistant steel wire according to the gas temperature, which is useful for preventing melting and deterioration of air permeability due to high-temperature gas. It is a filter. Further, according to the method for manufacturing a filter of the present invention, a filter having the above-mentioned excellent characteristics can be manufactured through a simple process, and the obtained filter can be widely used in gas generators for various uses.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the manufacturing process of a filter showing a first embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of a gas generator showing how the filter is used, and Fig. 3 is a diagram showing the bending line material used in the invention. Drawing showing waveforms, 4th
The figure is a manufacturing process explanatory diagram showing a second embodiment of the invention, FIG. 5 is a manufacturing process explanatory diagram showing a third embodiment of the invention, and FIG. 6 is a manufacturing process explanatory diagram showing a fourth embodiment of the invention. 7 is a sectional view taken along the line A-A of FIG. 6e, FIG. 8 is a sectional view taken along the line B-B, and FIG. be. DESCRIPTION OF SYMBOLS 1... Stainless steel wire, 3... Bent line material, 4... Cylindrical body, 5... Laminated body, 6... Upper mold, 7... Lower mold, 8... Filter, 21... Stainless steel wire, 23... Bent line material,
24... Laminate, 25... Primary molded product, 26... Fastening material, 27... Filter, 31... Bending line material, 33... Laminate, 34... Filter, 41... Projection, 42... Lower mold, 44... Upper mold, 45 ...concave groove, 46...filter,
50...wire mesh, 51...primary molded product.

Claims (1)

[Scope of Claims] 1. For gas generators with a bulk specific gravity of 1.0 to 3.0, which is made by laminating and compression molding bending material made of heat-resistant steel wire with a wire diameter of 0.1 to 1.5 mm into a wave or coil shape and then compression-molded into an annular shape. filter. 2. Bending a heat-resistant steel wire with a wire diameter of 0.1 to 1.5 mm into a wave or coil shape, winding the resulting bent line material around a cylindrical body to form an annular laminate, and compression molding this laminate into an annular shape. A method for manufacturing a gas generator filter. 3 Heat-resistant steel wire with a wire diameter of 0.1 to 1.5 mm is bent into a wave or coil shape, the resulting bent line material is wound around a cylindrical body to form an annular laminate, and this laminate is compression-molded into an annular shape to form a primary A method for producing a filter for a gas generator, which comprises forming a molded product, wrapping a fastening material around the cross section of the primary molded product, and then compression molding the wrapped primary molded product into an annular shape. 4 Heat-resistant steel wire with a wire diameter of 0.1 to 1.5 mm is bent into a wavy or coiled shape, the resulting bent line material is wound around a cylindrical body to form an annular laminate, and this laminate is compression-molded into an annular shape to form an outer periphery. A method for manufacturing a filter for a gas generator, comprising forming a plurality of grooves extending in the axial direction.