JPH0648260A - Seamless air bag - Google Patents

Abstract

PURPOSE:To reduce the number of part items and manhours in use of a multifiber weave and make an air bag easily formable, in an automotive rider protecting air bag. CONSTITUTION:A rider side top plate ground fabric 1 of an air bag and an inflator setting side bottom plate ground fabric 2 are made into a woven texture and sorted with each other at a weaving process, and these circumferential parts surrounding those of elements are solidly formed into a common weaving part 3 by means of weaving yarn forming the woven texture, thereby dispensing with a bag sewing process. In addition, the woven density in each of these top plate and bottom plate ground fabrics is altered, namely, the density of the top plate ground fabric is made into high density and the air permeability is set to the lowness of 0-2cc/cm<2>/sea by a frazil process, while the bottom plate ground fabric is made into the low density and the air permeability is set to the highness of 1-20cc/cm<2>/sec by this frazil process, thereby dispensing with a gas exhausting vent hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle, particularly an airbag for protecting an occupant of an automobile.
The present invention relates to a seamless (non-sewn) airbag in which a sewing process is simplified.

[0002]

2. Description of the Related Art In recent years, the use of air bag devices has been rapidly promoted for the purpose of protecting occupants of vehicles, especially automobiles. The structure of this air bag is usually made of nylon 6, nylon 66, polyester or the like. Using a base cloth coated with synthetic rubber etc. on a woven cloth using fibers,
This is the top plate (passenger side) and the bottom plate (inflator mounting side)
The cloths (10) and (11) are cut into separate pieces and sewn into a bag shape by a sewing machine as shown in FIGS. 3 and 4, and the bottom plate (11) has a vent hole (1) for discharging gas.
One or more 2) are provided, and a strap (13) is provided in the bag to control expansion.

[0003]

However, in the airbag as described above, the top plate and the bottom plate are separately cut and then sewn together, the vent hole is punched, and the strap is sewn. Requires each process,
There is a problem in that the number of parts and the number of steps are large and complicated, and a problem such as a wrong position to be matched during sewing is likely to occur.

The present invention addresses the above situation, and particularly aims to reduce the number of parts and the number of steps by utilizing the principle of multiple weaving in the weaving process, thereby facilitating the formation of an airbag. To do.

[0005]

In order to achieve the above-mentioned object, the present invention basically comprises a passenger side top board base cloth and an inflator installation side bottom board base cloth which are woven together to form a woven structure in a weaving process. The peripheral portion surrounding the is integrally formed with the common weaving portion by the fabric threads forming each of the above-mentioned fabric structures, thereby eliminating the need for the bag sewing process. In this case, the woven densities of the top board base cloth and the bottom board base cloth may be the same, but the woven densities of the top board base cloth can be increased by changing the woven density according to their respective roles. And its air permeability is 0-2cc / cm ² / by Frazier method
While the air permeability is low at sec, the bottom plate base fabric has a low density and the air permeability is high at 1 to 20 cc / cm ² / sec by the Frazier method, which further eliminates the need for vent holes for gas discharge. it can.

When the top board base cloth and the bottom board base cloth are woven separately, they should be connected by a connecting yarn so that the distance between both base cloths does not exceed a predetermined length at several places other than the peripheral portion. By this means, the deployed shape of the bag can be restrained, and it can be used as a substitute for the stop without providing a strap, which are advantageous in embodying the basic configuration of the present invention. Incidentally, as the means for weaving the top board base cloth and the bottom board base cloth in the weaving process, the double weft means for warp and weft is most commonly used.

[0007]

According to the airbag of the present invention, the top board base cloth and the bottom board base cloth are woven separately in the weaving process, and both base cloths are integrated into a common woven portion in the periphery, so that each base cloth is integrated. The bag-shaped bag can be obtained without cutting and sewing the bag-shaped bag with a sewing machine. Moreover, the weave density of the top board base fabric is increased to lower the air permeability to increase the airtightness, while the weave density of the bottom plate base cloth is reduced to increase the air permeability, so that it is not necessary to provide a gas exhaust vent hole. Allows gas exhaust.

[0008] Further, at the time of weaving, the top board base cloth and the bottom board base cloth are connected by the connecting thread, which serves as a strap and adjusts the expansion at the time of deployment.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 (a) and 1 (b) show an example of an airbag according to the present invention, in which (1) is a top board base cloth for an occupant,
(2) is a bottom plate base fabric on the side where the inflator is attached, (3) is a common weaving portion in the periphery, and the top plate base fabric (1) and the bottom plate base fabric (2) are multi-woven in the weaving process, In the figure, the warp and weft double weaves are woven and divided into plain weaves and the like with warps and wefts, respectively, and both of the base fabrics (1) and (2) are woven in the common weave portion (3) in the periphery. Both the warp yarns and the weft yarns that have become common weaving yarns form a common weaving portion (3). Therefore, in this airbag, the periphery of the bag body is a commonly integrated woven fabric, and the bag body is formed without sewing sewing after that.

Nylon 6, nylon 66, which is generally used for conventional airbags, is used as the yarn for weaving the top board base cloth (1), the bottom board base cloth (2), and the common weaving section (3).
Synthetic fibers such as polyester fibers are used, and the weaving of the top board base cloth (1) and the bottom board base cloth (2) and the integral formation of the common weave portion (3) in the periphery are known as a known multiple weave or bag weave. It is about to be done.

The top board base cloth (1) of the above-mentioned airbag.
When the bottom plate base fabric (2) is woven, it is of course possible to form it as a woven fabric having the same structure, but it is also effective to change the structure structure according to each role. For example, the woven density of the top board base fabric (1) is set to be low and the air permeability is set to 0 to ² cc / cm ² / sec by the Frazier method, while the bottom plate base cloth is set to low woven density and the air permeability is set to fragile. 1-20 by law
By setting cc / cm ² / sec, after the deployment is completed, when the occupant collides with the bag, it is possible to discharge the gas through the texture of the bottom plate base cloth.

Of course, not only the weaving density of the top board base cloth (1) and the bottom board base cloth (2) is changed, but also the kind and the thickness of the weaving yarns of the top board base cloth (1) and the bottom board base cloth (2) are changed. It is also possible to change the height, and it is also possible to appropriately combine this with a change in the texture or the weave density.

Further, in the above-mentioned airbag of the present invention, the top plate base cloth (1) and the bottom plate base cloth (2) are simply woven, but as shown in FIGS. 2 (a) and 2 (b). Placing a binding thread (4) for binding and restraining both base fabrics (1) and (2) so that the distance between both base fabrics (1) and (2) does not exceed a predetermined length. Is also preferred, which may be a known strap substitute.

In FIG. 2, the above-mentioned binding yarn (4) is concentrically divided into 8 pieces.
Equally distributed and connected at eight locations. Such binding yarn (4)
It is often found in the conventional bag weaving or multi-woven weaving process that the top plate base fabric (1) and the bottom plate base fabric (2) are bonded to each other by the above-mentioned method, and it is easily carried out also in the bag weaving process of the present invention. can do.

In the conventional airbag, the inner surface of the base cloth of the bag is usually coated with synthetic rubber or the like, but it is not essential in the airbag of the present invention, and the base on the inflator mounting side is not particularly required. The exhaust vent hole provided in the cloth can also be omitted. However, it does not prevent the coating and the provision of the vent holes.

Next, specific examples of the airbag of the present invention will be described. Weaving width of 700 mm using 66 nylon, 420 denier and 70 filament yarn, of which 640 m
mφ is woven into two layers, a top board base cloth and a bottom board base cloth, and a peripheral portion thereof is formed as a single layer by a common weave part of the top board base cloth and the bottom board base cloth, thereby creating a seamless airbag of the present invention. did. At this time, the weaving density of the top board base cloth is 50 × 50 pieces / 2.5 cm, the weaving density of the bottom board base cloth is 40 × 40 pieces / ^2.5 cm, and the air permeability of the former is 0.8 cc / cm ² / sec by the Frazier method. The air permeability of the latter was 3 cc / cm ² / sec.

In addition, the top board base cloth and the bottom board base cloth are concentrically arranged 8
Knotting yarns were placed at the places so that the distance between both base fabrics did not exceed the predetermined length. A deployment test was conducted using this airbag, and it was confirmed that the airbag could be put into practical use. In particular, there was almost no damage around the bag.

[0018]

As described above, according to the airbag of the present invention, the top board base cloth and the bottom board base cloth are separately woven in the weaving process, and the common woven portion is integrated in the peripheral portion. It can be created only by the process and the cutting process of the outer peripheral part and the inflator mounting opening, and the sewing process of the peripheral part which was conventionally required can be omitted, and simplification of the process can be achieved and Since the portion does not have a sewn portion, weakening due to sewing can be prevented and the strength in the portion can be improved.

Further, it is easy to produce a seamless airbag in consideration of exhaust gas emission without providing vent holes by changing the woven densities of the top board base cloth and the bottom board base cloth and changing the air permeability. By weaving a binding yarn for a strap in the weaving process, the process of cutting and sewing the strap can be further omitted and the number of parts can be reduced. The airbag of the present invention simplifies the process of manufacturing an airbag. A dramatic effect is expected above.

[Brief description of drawings]

1 shows an example of an airbag of the present invention, (a) is a schematic plan view, and (b) is a longitudinal sectional view taken along the line AA.

2A and 2B are another embodiment of the airbag of the present invention, in which FIG. 2A is a schematic plan view and FIG. 2B is a vertical sectional view taken along line BB thereof.

FIG. 3 is a perspective external view showing a conventional airbag example.

FIG. 4 is a vertical sectional view of the airbag shown in FIG.

[Explanation of symbols]

 (1) Top board base cloth (2) Bottom board base cloth (3) Common woven part (4) Binder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kotaro Isaji 100 Fujinoki, Tianjin, Itami City, Hyogo Prefecture, Toyo Tire & Rubber Co., Ltd. (72) Inventor Toru Ozaki Miyoshi, Nishikamo-gun, Aichi Prefecture Mountain No. 3 Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center

Claims (3)

[Claims] 1. The occupant-side top plate base fabric and the inflator-attachment-side bottom plate base fabric are woven separately from each other to form a woven structure, and a peripheral portion surrounding the woven structure forms a common woven portion by a woven yarn forming each woven structure. A seamless airbag characterized by being integrally formed. 2. The cloth density of the top board base cloth and the bottom board base cloth are changed,
The woven density of the top board base cloth is set to be higher than that of the bottom board base cloth, and the air permeability is set to 0 to ² cc / cm ² / sec by the Frazier method. On the other hand, the woven density of the bottom board base cloth is set to a relatively low density to increase the air permeability. The seamless airbag according to claim 1, wherein the Frazier method is 1 to 20 cc / cm ² / sec. 3. The bag is developed by connecting the woven top board base cloth and the bottom board base cloth to each other at several places other than the peripheral portion with a connecting thread so that the distance between the base cloth and the base cloth does not exceed a predetermined distance. The seamless airbag according to claim 1 or 2, wherein the shape is restricted.