JPH05285578A - Gas permeable forming, its manufacture and its using method - Google Patents

Abstract

PURPOSE:To greatly miniaturize and lighten the weight of the device by making the casing of the gas generator to double structure and together to freely adjust the volume and the mass of the forming body itself constituting cooling medium used also for filtering to a required value. CONSTITUTION:The metallic wire rod formed to a wavy shape or a spiral shape in the longitudinal direction is coiled around a flat or cylindrical pattern 3, laminated and formed to an elliptical tube like body or a cylindrical body, next this is compressed and formed to a forming body 40 of a plate like and circular arc like body by a forming die, and the forming body 40 and a microfilter 11 are attached to a gas generator composed of a casing 30 having one filter layer made to a cylindrical shape and divided in the circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathable molded article used as a filter and a cooling medium in a gas generator such as an air bag for automobiles and an injection device for emergency escape of a seat of an aircraft, a manufacturing method and use thereof. It is about the method.

[0002]

2. Description of the Related Art Conventionally, the structure of this type of gas generator is constructed as shown in FIGS. 7 and 8, for example. That is, in a casing 20 having a three-layer structure of a cylindrical inner tube 21, a middle tube 22, and an outer tube 23, an ignition device and a gas generating chamber 26 made of an ignition agent are formed in the inner space, and a filter is provided in the intermediate layer. The cooling medium 10 is mounted, and the precision filter 11 is mounted on the outer layer. Then, the gas generated in the gas generation chamber 26 is introduced into the filter / cooling medium 10 through the through hole 24 of the inner pipe 21, and then into the precision filter 11 through the through hole 25 of the middle pipe 22, Then, it is guided to the outside of the apparatus through the through hole 26 of the outer tube 23.

The filter / cooling medium 10 is formed into a cylindrical body as shown in FIG. 7, which is formed by winding a plain weave wire mesh made of metal such as stainless steel in a cylindrical shape and spot-welding the ends. Alternatively, by rolling a knitted wire mesh into a cylindrical shape and compressing it, or by winding a corrugated or spiral shaped metal element wire continuously into a predetermined cylindrical mold, and winding this in the axial direction. It is formed by a method such as compression molding.

[0004]

In the above conventional structure, the filter layer has a two-layer structure including a cylindrical filter / cooling medium and a precision filter having a larger diameter, and the casing has a three-layer structure. Downsizing of the gas generator,
This is a big design constraint for weight reduction.

Further, since the filter / cooling medium has a cylindrical shape, there is a problem that its volume and mass are unnecessarily large. That is, the inner diameter D and the length L are determined from the size of the ignition device in the gas generating chamber, the ignition agent, the volume of the gas generating agent, etc., and the wall thickness T and the porosity are determined from the design filtration accuracy, etc. In the case of conventional products that are shaped, the volume and mass are naturally determined, and the degree of freedom in adjustment is extremely small. Originally, the volume and mass should be determined from the amount of gas to be processed, but as a result of being determined from factors other than the amount of gas as described above, the volume and mass become unnecessarily large. It is the current situation that there are many cases.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and enables the casing of the gas generator to have a two-layer structure, thereby significantly reducing the size and weight of the device. It is an object of the present invention to provide a breathable molded body that enables the volume and mass of the molded body itself that constitutes a filter / cooling medium to a required value, and a manufacturing method and a method of using the breathable molded body. It is a thing.

[0007]

In the breathable molded article of the present invention, an assembly of metal wire strands formed in a corrugated or spiral shape in the lengthwise direction is compression molded into a plate-shaped arc-shaped body. The individual wires are tightly entwined with each other and connected.

In the method for producing a breathable molded article of the present invention, the metal wire is shaped into a corrugated or spiral shape in the lengthwise direction, and the flat or cylindrical body is wound and laminated to form an oval tubular shape or It is formed into a cylindrical shape, and then, this is compression-molded into a circular arc-shaped body with a plate-shaped body by a molding die.

In addition, the inside of a specific annular layer defined by the casing is divided in the circumferential direction by partition walls, and
A communication hole may be formed in this partition wall, and the air-permeable molded bodies according to the above-mentioned claim 1 having different functions may be mounted in the respective compartments as a filter and a cooling medium.

[0010]

In the above structure, an assembly of metal wire strands formed in a corrugated or spiral shape in the length direction is compression-molded into an arc-shaped body with a plate-like body, and the respective strands are intimately entangled with each other. Since the filter layer of the casing of the gas generator does not need to have a multi-layered structure, the apparatus can be made significantly smaller and lighter, and a molded body that constitutes a filter and a cooling medium. The volume and mass of itself can be freely adjusted to the required values.

Further, according to the method for producing a breathable molded article of the present invention, a breathable compact having a plate-like shape and an arcuate shape can be continuously and easily produced using a metal wire.

[0012]

EXAMPLE As shown in FIG. 1 (a), first, a metal wire is formed into a corrugated wire 1 by two-dimensionally corrugating it in a length direction (in a single plane). It is desirable that the pitch P of the waveform is 30 times or less the wire diameter of the metal wire and the wave height h is 3 times or more the wire diameter in order to entangle the wires with each other. For example, when a wire having a wire diameter of 0.4 mm is used, the pitch P is 12 mm or less and the wave height h is 1.2 mm or more.
If it is out of the above range, the entanglement of the wires in the next step becomes insufficient, and the shape retention is deteriorated, which is not preferable. The corrugated line 1 may be further formed into a corrugated shape (three-dimensionally processed) in a direction orthogonal to the paper surface.

Further, as shown in FIG. 1 (b), the strand of the metal wire may be formed into a spiral shape to form a spiral wire (curl wire) 2. The pitch p of this spiral shape is 4 times the diameter of the metal wire.
It is desirable that the coil diameter d be 0 times or less, and the coil diameter d be 4 times or more the wire diameter in order to entangle the wires with each other. For example, when a metal wire having a wire diameter of 0.4 mm is used, the pitch p is 16 mm or less and the coil diameter d is 1.6 mm or more. If it is out of the above range, the entanglement of the lines in the next step becomes insufficient, and the shape retention is deteriorated, which is not preferable.

Next, as shown in FIG. 2, the corrugated wire 1 (or the spiral wire 2) is spirally wound and laminated on a mold 3 made of a flat plate. The spiral winding angle θ is 15 ° or more,
It is desirable that the lower layer and the upper layer are sequentially laminated so that the crossing angle intersects at 30 ° or more in order to entangle the lines with each other. If the winding angle θ is less than 15 °, the entanglement of the wires becomes insufficient, the connection between the wires after compression molding becomes weak, and the shape is easily deformed, which is not preferable. By winding a predetermined amount around the outer peripheral surface of the mold 2 and then removing it, an oblong cylindrical body 4 as if a cylindrical body is formed into a flat shape as shown in FIG. 3 is obtained. Then, this is compression-molded by a molding die 6 having semi-circular irregularities as shown in FIG. 4 to manufacture a molded body 40 that is compression-molded into an arc-shaped body with a plate-shaped body as shown in FIG. By this compression molding, the corrugated wires 1 are entwined with each other and joined together, and the molded body 40 is a plate-shaped arcuate body that does not lose its shape. The compression molding by the molding die 6 may be performed in plural times. Further, instead of the flat mold 3 shown in FIG. 2, a cylindrical mold is used to form a cylindrical molded body, and the molded body 6 is compression-molded to manufacture the molded body 40. Good.

FIG. 6 shows a gas generator, the casing 30 of which has an inner tube 31 forming the central gas generating chamber 30, an outer tube 32 on the outer periphery thereof, and an annular space formed therebetween in the circumferential direction. It is formed by a partition wall 33 that is divided, and a communication hole 35 is formed in this partition wall 33. The molded body 40 is mounted in one space, and the known precision filter 11 is mounted in the other space.
A through hole 36 for exhaust is formed in the outer pipe 32 in the portion that is the outer wall of the compartment in which the is mounted, and a through hole 34 is formed in the inner pipe 31 in the portion that is the inner wall of the compartment in which the molded body 40 is mounted. Has been done.

In this apparatus, when a gas is generated in the gas generating chamber 30, the generated gas is sent from the through hole 34 into the molded body 40 to be filtered to some extent and the gas is cooled, and then the communication hole is formed. It is sent to the precision filter 11 through 35, where precise filtration is performed, and then discharged from the through hole 36 to the outside of the apparatus.

In the above embodiment, the molded body 40 and the precision filter 11 each have a central angle of about 180.
I showed an example of dividing into two in the circumferential direction using the one of °.
The central angle may be reduced to three or more divisions in the circumferential direction.

(Example 1) Using a stainless steel wire (SUS304) having a wire diameter of 0.4 mm, a two-dimensional waveform (pitch P is 4 mm and height h is 2 mm) as shown in FIG. 1 (a) is processed. The corrugated wire 1 is wound and laminated with a mold 2 (width B is 80 mm, plate thickness t is 5 mm) made of a flat plate as shown in FIG. 2 at a winding width of 100 mm and a winding angle θ of 20 °. ,
A molded body 4 having a weight of 100 g was obtained. Next, this was compression-molded by a molding die 6 as shown in FIG. 4 to produce a plate-shaped arcuate molded body 40 as shown in FIG. This molded body 40 has an inner diameter of 40 mm, a wall thickness of 6 mm, a length of 100 mm,
The central angle was 140 °, the weight was 100 g, and the porosity was 60%. The molded body 40 was homogeneous without the corrugated lines 1 being tightly coupled to each other so that the shape was not lost.

(Example 2) Using a stainless steel wire (SUS304) having a wire diameter of 0.35 mm, a curl processed into a spiral shape (pitch p is 4 mm, coil diameter d is 3 mm) as shown in FIG. 1 (b). Wire 2 is a cylindrical mold with an outer diameter of 12 mm,
A winding width was 100 mm and a winding angle θ was 20 °, and the layers were wound and laminated to obtain an annular molded body having a weight of 35 g. Next, this was compression-molded by a molding die 6 as shown in FIG. 4 to produce a plate-shaped arcuate molded body 40 as shown in FIG.
This molded body 7 has an inner diameter of 40 mm, a wall thickness of 9 mm and a length of 10
The molded body 40 was 0 mm, the central angle was 60 °, the weight was 35 g, and the porosity was 80%, and the curl lines 2 were not deformed because the corrugated lines 1 were closely connected to each other, and were homogeneous.

[0020]

As described above, in the breathable molded article of the present invention, the assembly of the metal wire strands formed in a corrugated or spiral shape in the length direction is formed into a circular arc-shaped body as a plate-shaped body. It is compression-molded and the wires are tightly entwined and connected to each other, and the filter layer of the casing of the gas generator does not have to have a multi-layered structure, which enables a significant reduction in size and weight of the device. In addition, the volume and mass of the molded body itself that constitutes the filter and cooling medium can be freely adjusted to required values.

Further, according to the method for producing a breathable molded article of the present invention, a breathable compact having a plate-like shape and an arcuate shape can be continuously and easily produced using a metal wire.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a metal element wire applied to the implementation of the present invention.

FIG. 2 is an explanatory diagram of a state in which the strand is wound into a mold.

FIG. 3 is an explanatory diagram showing a state in which the above-mentioned wire has been wound around a mold and then removed from the mold.

FIG. 4 is a perspective view of a mold for compression-molding the one shown in FIG.

5 is a perspective view of a molded body molded by the molding die of FIG.

FIG. 6 is a cross-sectional view of a gas generator using the breathable molded body.

FIG. 7 is a perspective view of a filter / cooling medium applied to a conventional gas generator.

FIG. 8 is a cross-sectional view of a conventional gas generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wavy line 2 Spiral line 3 Mold 6 Mold 30 Device casing 40 Molded body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Yoshikawa, 10-1 Nakahama-cho, Amagasaki-shi, Hyogo Shinko Steel Wire Industry Co., Ltd. 703 (72) Inventor Yuichi Itabashi 2-10-6 Kita Aoki, Higashinada-ku, Kobe E6909 (72) Inventor Akihiko Suehiro Hozumi, Takino-cho, Kato-gun, Hyogo 701

Claims (3)

[Claims] 1. An assembly of metal wire strands formed in a corrugated or spiral shape in the lengthwise direction is compression-molded into an arc-shaped body by a plate-shaped body, and the respective strands are tightly entangled with each other and joined together. A breathable molded article characterized in that 2. A metal wire is formed into a corrugated or spiral shape in the length direction, which is wound into a flat plate or a cylindrical body and laminated to form an elliptic cylindrical shape or a cylindrical shape, which is then formed. A method for producing an air-permeable molded body, which comprises compression-molding a plate-shaped body into an arc-shaped body using a mold. 3. A specific annular layer partitioned by a casing is divided in the circumferential direction by partition walls, and communication holes are formed in the partition walls, and each partition has different functions from each other. A method of using a breathable molded article, which comprises mounting the breathable molded article as a filter and cooling medium.