JP2002120683A - Air bag for side part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light weight and flexible air bag for a side part having air-tightness and compact storability, and capable of being easily manufactured. SOLUTION: This air bag for a side part is formed by hollow weave from a primary yarn, a contour part of a hollow part of the hollow weave and its inner side intermediate connection part are formed by making a shape drawn by combination of straight lines in parallel to warp or weft of fabrics. The primary yarn is 400 deci-tex or less, and the bag is coated with a heat resistant elastomer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for protecting an occupant, and more particularly to a side airbag that is light and compact, can be stored in a compact manner, and has excellent airtightness.

[0002]

2. Description of the Related Art In recent years, airbag systems have become widespread as occupant protection safety devices, and the number of mounting parts has been increasing from driver seats to passenger seats, side collision protection, and rear seats.

[0003] In particular, an airbag for protecting an occupant from an impact at the time of a side collision, that is, an airbag for protecting a side collision (hereinafter, referred to as a side airbag) has been attracting attention as a means for further enhancing the safety for the occupant. ing.

[0004] However, since the side airbag is deployed in a narrow space between the occupant seat and the vehicle body, it is necessary to protect the occupant with a small-sized and small-sized bag. Unable to absorb energy enough,
Consideration must also be given to avoiding problems such as contact with the occupant and impact.

[0005] In particular, in order to prevent the occupant from hitting the side window and its vicinity violently by the impact of the side collision, the passenger is deployed along the side window and covers all or a part of the window. The side airbag, i.e., the inflatable curtain, does not leak gas from the bag body for more than a few seconds after deployment, so as to protect the occupant's head even if the body rolls over due to a side impact. High airtightness is required, and the bag base fabric is coated with a silicone resin or rubber.

Further, in the case of an inflatable curtain which is housed inside the vehicle body around the side window portion, the storage portions such as the pillar portion and the roof side portion are extremely narrow, so that the volume and cross-sectional area of the folded bag must be reduced. However, if the base cloth used in conventional driver's and passenger's seat bags is used, it is necessary to take measures such as a partial design change of the vehicle body structure and installation of a separate storage unit to accommodate the folded bag. Was.

For example, Japanese Unexamined Patent Publication No. 10-109607 discloses a woven bag, that is, a joining portion of two woven fabrics forming a sack portion is woven by using a common woven structure to form a woven yarn constituting a woven structure of each cloth. A side airbag in which the entire bag is sealed with an air-impermeable coating material has been proposed. By coating both sides of the bag by the weaving, a non-sewn bag can be obtained, and an airbag with extremely high airtightness can be obtained without gas leakage from the sewn portion.

[0008] However, in order to weave an airbag in which most of the outer periphery of the bag portion is formed by a curve, by bag weaving, for example, as disclosed in Japanese Patent Application Laid-Open No. 1-254446, a jacquard device is usually used. Will be used. As is well known, a jacquard device controls the opening of each warp of a woven fabric by raising and lowering a suspending yarn. In a high-density woven fabric such as for an airbag, the total number of warp yarns increases and the yarn becomes thinner. In addition, the number of jacquard devices to be installed increases, the cost increases, and maintenance of an extremely large number of hanging threads is required.

On the other hand, proposals have been made to make an extremely thin woven fabric using thin threads, fold the airbag compactly, and reduce the storage space.

For example, US Pat.
An airbag using a woven fabric using nylon 66 from 5 denier (50 dtex) to 140 denier (155 dtex) is described. The basis weight of these fabrics is half or less than that of conventional airbag fabrics, and exceeds the conventional level from the viewpoint of weight reduction.However, the mechanical properties of the fabric itself are insufficient compared to conventional airbag fabrics. ing. Therefore, the airbag of the present invention has a rectangular outer peripheral shape and is intended to secure pressure resistance of the bag body by eliminating sewing on the outer peripheral portion. However, a bag having a complicated shape such as a side airbag is used. Difficult to apply to.

[0011]

SUMMARY OF THE INVENTION The present invention provides a lightweight and flexible side airbag having high airtightness and extremely excellent compact storage required for an inflatable curtain, particularly an inflatable curtain. Further, it is an object of the present invention to provide a side airbag which can be obtained by a simple manufacturing method.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to the manufacture of lightweight and flexible airbags suitable for side airbags, particularly inflatable curtains, which can be stored in a very compact manner while maintaining high airtightness. As a result of diligently devising the technology, the above-mentioned problem could be solved.

That is, the present invention relates to (1) an airbag for protecting a side portion formed by joining two main body base fabrics in a bag weave to form a bag shape. The intermediate connecting part that connects the inner main body base cloth is shaped by a combination of straight lines parallel to the warp or weft of the woven fabric, and the main base cloth is a 400 dtex or less original yarn coated with a heat-resistant elastomer. A side airbag characterized by being a woven fabric using (2) an intermediate connecting portion,
(1) The side airbag according to the above (1), wherein the plurality of compartments are partitioned along the front-rear direction of the vehicle, and (3) the passage of the compartment closest to the gas supply device among the compartments. (2) The side airbag according to the above (2), wherein the cross-sectional area is larger than that of the other compartments. (4) The cross-section of the plurality of compartments is separated from the gas supply device. The cross-sectional area of the flow path is smaller than that of the other adjacent compartments in accordance with (3), and the side airbag according to the above (3), and (5) a loom equipped with a dobby device. The present invention relates to the side airbag according to the above (1) to (4).

The side airbag of the present invention is not formed by sewing two base cloths prepared in advance, but is formed without sewing from a raw yarn by a bag weave. That is, since the two main body base fabrics are joined by a bag weave, and the entire main body base fabric is impermeable, a sewing process is not required, and subsequent sealing of the sewn portion is not required.

According to the present invention, the outline of the hollow portion of the woven fabric and the intermediate connecting portion are drawn by a combination of straight lines parallel to the warp or weft of the woven fabric. For this reason, the weaving device for the bag weaving is not complicated and can be rationally manufactured. Here, the shape of the hollow portion includes an outer peripheral portion of the hollow portion and a bag portion obtained by dividing the hollow portion into several sections.

In the present invention, the hollow portion formed by the weaving has a shape drawn in a straight line. However, in order to conform to a desired shape such as a shape along a vehicle window, for example, the outer region base fabric of the weaving is used. What is necessary is just to extend and cut the woven structure of each base fabric to the required size. A mounting portion is provided in the outer region.

According to the present invention, furthermore, the inflatable portion of the main body of the woven fabric may further comprise:
A plurality of compartments may be formed in parallel in the front-rear direction by forming an intermediate connection portion in parallel with the up-down direction of the vehicle, or an intermediate connection formed by a binding weave of a bag weave parallel to the front-rear direction. It may be constituted by a plurality of compartments such as a plurality of cylinders connected to each other via a portion. The deployment shape, which is divided into a plurality of compartments and has a reduced thickness when inflated, can be simultaneously and integrally formed by the weaving and can be appropriately deployed in a limited space beside the occupant's head.

Further, when the compartments provided along the front-rear direction of the vehicle expand, the tension for tensioning the entire bag body in the front-rear direction increases, so that the head of the occupant can be properly received and protected.

Among the plurality of compartments, it is preferable to maximize the cross-sectional area of the flow passage in the compartment closest to the gas supply device in order to expand the bag in a short time and to increase the tension in the front-rear direction.

Further, reducing the cross-sectional area of the gas flow path as the distance between the compartment closest to the gas supply device and the compartment located farthest away from the gas supply device increases the entire bag body with an appropriate amount of gas. It is preferable in expanding the bag and reducing the folded volume of the bag.

The ratio of the dimensions between the compartments may be selected in accordance with the inflated shape, volume, folding volume, etc. of the bag. For example, the minimum dimension is about 0.2 to 0.6 for the maximum dimension 1. The dimensions of other compartments may be selected according to the shape and number of compartments.

An intermediate connecting portion, which is a partition between a plurality of compartments,
The distance between the compartments, that is, the width of the intermediate connecting portion, is defined by the width of the compartment, the number of compartments (cylindrical), the capacity of the entire bag, the folded volume, etc. You only have to consider it. Further, the length of the intermediate connecting portion may be the same in all the compartments, or may be different between the compartments.

Further, in some cases, a part of the intermediate connecting portion may be made discontinuous so that partially adjacent compartments communicate and expand.

The present inventor has described in Japanese Patent Application No. 11-279569 that an airbag exceeding 210 denier is not suitable for compact storage. Of course, the thinner the yarn used for the base cloth is, the more preferable it is because the folded bulk of the bag can be easily reduced. However, in recent years, with the diversification of vehicle shape variations,
Due to the ease of use and ease of use, the height of the vehicle or the height of the ceiling appeared, and when considering the applicability to such vehicles, it was determined that both the compact storage and the pressure resistance of the bag were satisfied. The area that is being changed is also changing.
When such a high vehicle rolls over, the rising curve of the internal pressure of the airbag tends to be steep, and therefore 235 dtex (210 denier).
In some cases, a method of easily increasing the pressure resistance with an airbag using a slightly thicker thread than the above is preferable. Moreover, such vehicles generally have ample room at the periphery of the window.

Therefore, in the present invention, 400 g
Decitex (360 denier) or less, preferably 35
Provided is an airbag which uses a woven fabric using fine threads of 0 dtex (315 denier) or less, more preferably 235 dtex (210 denier) or less. 400
If a thick yarn of decitex or more is used, the folded volume cannot be reduced, and an airbag suitable for an inflatable curtain cannot be provided.

The basis weight of the base fabric of the bag is 200 g / m ² or less before the heat-resistant elastomer is applied.
Preferably it is 180 g / m ² or less. If the basis weight exceeds 200 g / m ² , it is difficult to reduce the weight of the bag.

Further, the cover factor determined from the decitex (d tex) of the yarns constituting the woven fabric and the driving density (book / inch) of the woven fabric is 1800 or more, preferably 2
2,000 to 2,600 are also desirable. When the cover factor is less than 1800, not only the amount of silicone coating for obtaining airtightness is increased and the basis weight of the base fabric becomes heavy, but also the fabric is misaligned when the airbag is deployed by impact. It is easy and the joint may be damaged. on the other hand,
When the cover factor exceeds 2600, the woven fabric becomes extremely coarse and hard, and it is difficult to reduce the folded volume.

Here, the fabric cover factor (CF)
Is an index indicating the denseness of the woven fabric structure. The decitex (Dw and Df) of the warp and the weft used in the woven fabric and the warp density and the weft density (Nw and Nf) of the woven fabric (book /
Inches). CF = √Dw × Nw + √Df × Nf

In the present invention, it is important to provide a heat-resistant elastomer to the base fabric. If there is no or insufficient coating of the elastomer, gas escapes from the entire body base cloth or the boundary of the continuous portion between the cylinders when the bag is deployed, and it is not possible to secure a desired airtightness for a long time. .

The amount of the heat-resistant elastomer to be applied is, for example,
The thickness may be from 10 to 100 g / m ² (in terms of solid content) when applied, and from 20 to 200 μm when laminated. However, in order to prevent the pressurized gas from leaking from the bag, this range is used. It is not limited to.

Further, the present invention is not a conventional jacquard apparatus which requires complicated maintenance and is used for manufacturing a woven airbag, but is manufactured by a loom with a dobby apparatus in which the control of the loom is easy at each stage. Can be. The dobby device adjusts the shedding by dividing the warp into several groups, so that even if the total number of warps increases, the size does not increase as in the jacquard device.

Various dobby devices are in practical use depending on the type of loom or fabric to which the dobby device is attached. For example, for a shuttle loom, there are a crank dobby, an active dobby, a depolarized dobby, a cam dobby, and for a jet loom, a high-speed depolarized cam dobby is mainly used. In addition, there is a rotary dobby and an electronic dobby.

The heat-resistant elastomer applied to the base fabric of the present invention is required for a covering material of an airbag.
Any material may be used as long as it has excellent physical properties such as heat resistance, adhesiveness to the base cloth, abrasion resistance, and tackiness.

The method of applying the heat-resistant elastomer is as follows: 1) coating method (knife, kiss, reverse, comma, etc.), 2) dipping method, 3) printing method (screen, roll,
And a processing method such as a laminating method, and the heat-resistant elastomer may be any of a solvent type, an emulsion type, an aqueous solution type, a fine powder type, a film or sheet type, and the like.

The heat-resistant elastomer used in the present invention may be any material to which the above-mentioned processing method can be applied, such as silicone-based, fluorine-based, chlorine-based, polyurethane-based (including silicone-modified and fluorine-modified), epoxy-based. ,
Polyester, polyamide, polyimide, chlorsulfone, phenol, acrylic, etc. may be appropriately selected from one or a mixture of two or more, or copolymers, modified products, etc. Improved properties,
Silicone-based, fluorine-based, and polyurethane-based (including silicone-modified) are particularly preferred in terms of heat resistance, easy processing, and the like.

The heat-resistant elastomer has processability,
Various additives commonly used to improve adhesion, surface properties, durability, etc., such as crosslinking agents, reaction accelerators, reaction retarders, heat stabilizers, antioxidants, light stabilizers, and aging prevention Agents, lubricants, leveling agents, anti-adhesives, pigments,
One or two or more of a water repellent, an oil repellent, a hiding agent such as titanium oxide, a gloss imparting agent, a flame retardant, a plasticizer, and the like may be selected and mixed.

The heat-resistant elastomer may be interposed on at least one surface of the woven fabric, a gap between the woven fabrics, a gap between the fiber yarns, or the like.

The heat-resistant elastomer may be added with various pretreatment agents for improving the adhesion to the base fabric, an adhesion improver, or the like. You may. Furthermore, in order to impart heat resistance, anti-aging property, oxidation resistance and the like to the elastomer, after applying the elastomer to the fabric, drying, crosslinking, vulcanization, etc. are performed with hot air treatment, contact heat treatment, high energy treatment (high frequency, electronic (Rays, ultraviolet rays).

The fiber yarn constituting the woven fabric of the present invention is not particularly limited. For example, nylon 6, nylon 66, nylon 46, nylon 610, nylon 6
12 or the like, or an aliphatic polyamide fiber obtained by copolymerization or mixing thereof, nylon 6T, nylon 9
Polyamide fiber obtained by copolymerization of aliphatic amine and aromatic carboxylic acid represented by T, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or the like alone or by copolymerization thereof, Paraphenylene terephthalamide, and aramid fibers typified by copolymers thereof with aromatic ethers, wholly aromatic polyester fibers, vinylon fibers, ultrahigh molecular weight polyethylene fibers, fluorine fibers containing polytetrafluoroethylene, Polysulfone (PSf) fiber, polyphenylene sulfide (PPS) fiber, polyetheretherketone (PEEK) fiber, polyimide (P
I) Fiber, polyetherimide (PEI) fiber, cellulosic fiber including high-strength rayon, acrylic fiber, carbon fiber, glass fiber, silicone carbide (SiC)
It may be appropriately selected from fibers, alumina fibers, and the like, and in some cases, may include inorganic fibers such as metal fibers represented by steel.

Various additives usually used for improving the spinnability, processability, and durability of materials are used in these fiber yarns, for example, heat stabilizers, antioxidants, light stabilizers, and aging. One or more of an inhibitor, a lubricant, a smoothing agent, a pigment, a water repellent, an oil repellent, a concealing agent such as titanium oxide, a gloss imparting agent, a flame retardant, and a plasticizer may be used. In some cases, processing such as twisting, bulking, crimping, and winding may be performed. Furthermore, the form of the yarn is
There is no particular limitation on filaments of long fibers, spun yarns of short fibers, or composite yarns of these.

The dobby device used in the present invention may be any of an electronic type and a mechanical type depending on the loom to be used, the weaving organization, and the like. The loom may be appropriately selected from various looms used for producing ordinary industrial fabrics. A shuttle loom, a water jet loom (WJ
L), an air jet loom (AJL), a rapier loom, a projectile loom, or the like. The texture of the woven fabric is plain weave, slant weave (basket weave), twill weave, lattice weave (rip-stop weave), or a composite structure of these.
Either may be used.

The airbag according to the present invention is a side airbag for protecting an occupant from a side impact of a vehicle, and particularly the inside of a vehicle body (front pillar, roof side rail, center pillar) around a side window. Part, rear pillar part, etc.) and is folded in a curtain shape near the side window part (the space under the front pillar, center pillar or rear pillar in the vehicle interior, under the roof side rail) due to the gas escaping from the inflator during a side collision Side protecting airbags, such as those disclosed in
The invention can also be applied to the arrangement structure of JP-A-1388861.

The reinforcing fabric used for reinforcing the periphery of the inflator mounting opening of the airbag according to the present invention may be the same fabric as that used for the bag body, but separately prepared reinforcing fabric, for example, nylon 66 940 decitex,
A single or a plurality of woven fabrics thicker than the woven fabric for an airbag of the present invention, which are manufactured using 470 decitex or the like, may be used. The reinforcing cloth referred to here includes a flameproof cloth for shielding hot gas ejected from the inflator, and in order to impart heat resistance to the reinforcing cloth, a heat-resistant resin such as a silicone resin, a fluororesin, or a heat-resistant rubber is used. Or a woven fabric using heat-resistant fibers such as aramid fibers.

The airbag of the present invention is intended for a side airbag for protecting a side collision, and such an airbag is, for example, in the form of a curtain and accommodated in the peripheral portion of the side glass. , Which can be applied to seats, backrests, pillows, etc. that are installed on the side of the occupant, etc.
The capacity and the like may satisfy the required requirements.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments. In the examples, the performance evaluation of the airbag was performed by the following method.

(1) Airtightness test The inflator insertion portion of the bag is partially sewn, pressurized air is injected into the bag in a sealed state except for the pressurized air supply portion, and after the bag internal pressure reaches 50 kpa. Then, the supply of the pressurized air was stopped, and the time required for the pressure gauge provided near the pressure supply valve to become approximately 0 kpa was measured.

(2) Folded Thickness The thickness was measured in a state where the bag was folded 10 times in a bellows shape substantially parallel to the length direction, and a relative comparison was made with the case of Example 2 as 100.

Example 1 Plain weave of the base fabrics 1 and 2 of FIG. 1 using a nylon 66 fiber of 155 dtex / 68f (original yarn strength of 7.3 cN / dtex) with a weave density of 74 / inch in both warp and weft. Was woven with a loom equipped with a dobby device. The woven fabric is refined and heat-set, and then a thermosetting silicone resin 45 g / m ² (in terms of solid content) is applied to the two outer surfaces of the bag fabric,
After drying and heat treatment, a coated base fabric was obtained. The density of each of the woven fabrics 1 and 2 after coating is
Inch, a weft 75 / inch, basis weight of the fabric before coating 101g / m ^2, after coating was 146 g / m ^2. As shown in FIG. 1, the bag portion formed by the binding by the weaving is formed by a combination of straight lines parallel to the warp and the weft of the woven fabric, and the size is 120 cm on the upper side, 170 cm on the lower side, and 45 cm in height. With a deformed trapezoid (see Fig. 1)
Inside the bag, four 30 cm-high section connecting portions (4a to 4d) were provided in a straight line parallel to the warp. The width of each joint was 3 cm.

Then, pressurized air was injected while a rubber tube was inserted through the inflator mounting port (6) and sealed. Table 1
Shows the measurement results of airtightness and folded thickness. Excellent airtightness compared to the conventional product created by sewing (Comparative Example 2),
The compact storage was also excellent.

Example 2 The procedure of Example 1 was repeated except that the nylon 66 fiber was 350 dtex /
Using a yarn of 72f (original yarn strength of 8.4 cN / dtex), a plain woven bag woven fabric having a weaving density of the base cloth of 57 / inch and a weft of 58 / inch is woven, and the coating amount is 60 g / m2. except for using ^2, to create an air bag in accordance with example 1, the characteristics were evaluated. The density of each of the woven fabrics 1 and 2 after coating is 60 yarns / inch for both the warp and weft, and the basis weight is 186 g / m ² before coating and 246 g after coating.
/ M ² . It is more airtight than the conventional product (Comparative Example 2) made by tubing.

Example 3 Using a yarn of nylon 66 fiber 235 dtex / 36f (original yarn strength 8.5 cN / dtex), the weaving density of each of the base fabrics 1 and 2 in FIG. Was made with a loom equipped with a Dobby device. The woven fabric was scoured and heat-set, and then a thermosetting silicone resin of 50 g / m ² (in terms of solid content) was applied to both sides of the bag fabric, followed by drying and heat treatment to obtain a coated woven fabric.
The density of each of the woven fabrics 1 and 2 after coating was 70 lines / inch in both weft and weft, and the basis weight of the woven fabric was 140 g / m ² before coating and 190 g / m ² after coating.

FIG. 7 shows a bag portion formed by joining by bag weaving.
As shown in FIG. 3, three cylinders (15a, 15b, 15a, 15b,
15c), a cylinder 15 directly connected to the gas inlet
The inner diameter of “a” is the largest, and is reduced in the order of 15b and 15c. The size of the bag is 120 cm on the upper side and 170 c on the lower side.
m, a height of 45 cm (all outside the outer peripheral connection portion), a deformed trapezoid (see FIG. 7), and the width of the cylinder in a plan view is 15a;
15b and 15c were 12 cm, 9 cm and 6 cm, respectively, and the partition width between the cylinders was 4 cm.

Next, according to the method of performance evaluation, pressurized air was injected in a state where a rubber tube was inserted from the inflator mounting port 16 and sealed. Table 1 shows the measurement results of the airtightness and the folded thickness. Conventional product created by sewing (Comparative Example 2)
It was excellent in airtightness and excellent in compact storage as compared with.

Comparative Example 1 In Example 3, 470 dtex / nylon 66 fiber was used.
Using a yarn of 72f (original yarn strength of 8.5 cN / dtex), weaving a plain woven bag woven fabric with a weaving density of the base fabric and a weft of 49 yarns / inch, and a coating amount of 80 g / m ^2. Prepared an airbag according to Example 3 and evaluated the characteristics. The density of each of the woven fabrics 1 and 2 after coating is 51 lines / inch in both weft and weft, and the basis weight of the woven fabric is 200 g / m ² before coating and 280 g after coating.
/ M ² . As shown in Table 1, although the obtained bag was excellent in airtightness, compact storage was inferior.

Comparative Example 2 In Example 3, two plain fabrics were woven without using each of the base fabrics shown in FIG. 7 as a bag fabric, and a thermosetting silicone resin of 30 g / m ² (solid form) was previously formed on one surface of the fabric. Minute conversion)
The coated base fabric was used. Then, instead of binding by weaving, it was formed into a bag shape by sewing. For sewing, both the upper and lower threads use nylon 66 fiber 8th thread, the outer circumference of the bag is double chain stitching 2 rows (number of stitches 3.5 needles / cm), partition between cylinders inside the bag. The part is two rows of lock stitches (number of stitches 4 stitches / c
m), an airbag was prepared according to Example 3, and the characteristics were evaluated, except that the surface of each stitch portion was sealed from the outside with room-temperature curable silicone. The basis weight of the woven fabric was 140 g / m ² before coating and 170 g / m ² after coating. As shown in Table 1, when produced by sewing, even if a seal process is performed, the airtightness is inferior, and the compact storability is not good as compared with Example 3.

[0056]

[Table 1]

[0057]

As described above, according to the present invention, the base cloth prepared in advance is 400 dt without using sewing means.
ex to form an airbag by bag weaving using the original yarns, the bag bag (hollow portion) is contoured by the bag weaving, and at the same time, the intermediate connecting part is also connected and coated with a heat resistant elastomer. Thus, it is possible to obtain a side airbag that is lightweight, compact, and excellent in airtightness.Moreover, the side airbag can be obtained without using a jacquard device that is complicated and costly. It can be easily manufactured by a simple method. According to the present invention, the air for the side portion can be stored lightly and compactly and has excellent airtightness by forming a plurality of compartments along the front-rear direction of the vehicle by connecting the bag portion (hollow portion) particularly as a bag weave. You can get a bag.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an airbag of the present invention before deployment as viewed from a side window.

FIG. 2 is a sectional view taken along line AA of FIG. 1 after development. The outer peripheral portion 3 and 4a to 4d are connecting portions of the woven cloth.

FIG. 3 is an explanatory view of another embodiment of the present invention before deployment as viewed from a side window.

FIG. 4 is a sectional view taken along line AA of FIG. 3 after development.

FIG. 5 is an explanatory view of another embodiment of the present invention before deployment as viewed from a side window.

FIG. 6 is an explanatory view of a still further embodiment of the present invention as viewed from a side window portion before deployment.

FIG. 7 shows still another embodiment of the present invention.

FIG. 8 is an explanatory sectional view taken along line AA of FIG. 7 after development.

FIG. 9 is an explanatory view of a still further embodiment of the present invention as viewed from a side window portion before deployment.

FIG. 10 is an explanatory sectional view taken along line AA of FIG. 9 after development.

FIG. 11 is an explanatory view of a further embodiment of the present invention before deployment as viewed from a side window.

FIG. 12 is an explanatory sectional view taken along line AA of FIG. 11 after development.

[Explanation of symbols]

3, 4a to 4d, 13, 14a to 14c are joint portions of the woven cloth

Continued on front page F-term (reference) EB05

Claims (5)

[Claims] 1. A side protection airbag formed by joining two main body base fabrics by a woven weave to form a bag shape, wherein the hollow portion of the woven weave has a straight line parallel to a warp or a weft of a woven fabric. Forming the shape drawn by the combination, forming an intermediate connecting portion that connects the two body base fabrics inside this contour shape in a shape drawn by a combination of straight lines parallel to the warp or weft of the fabric, The airbag for a side portion, wherein the main body base fabric is a woven fabric using a raw yarn of 400 dtex or less coated with a heat-resistant elastomer. 2. The side airbag according to claim 1, wherein the intermediate connecting portion forms a plurality of compartments partitioned along the front-rear direction of the vehicle. 3. The side airbag according to claim 2, wherein, among the compartments, the cross-sectional area of the passage closest to the gas supply device is larger than that of the other compartments. 4. The side airbag according to claim 3, wherein the plurality of compartments have a smaller flow path cross-sectional area than the other adjacent compartments as the distance from the gas supply device increases. 5. The side airbag according to claim 1, wherein the side airbag is manufactured by a loom equipped with a dobby device.