JPH02158442A - Air-bag - Google Patents

Abstract

PURPOSE:To aim at enhancing the expandability and at lowering the cost by joining peripheral side parts of an air bag fabricated in a bag-like shape from two groups of warp yarns with the use of a textile fabric composed of the two groups warp yarns the weft yarns so that a substantial part of air can permeate through gaps in the textile structure on the inflator attaching side. CONSTITUTION:A front woven fabric 31 and a rear woven fabric 32 are integrally jointed at its peripheries 33 by means of warp yarns and weft yarns so as to form an air bag 30. An opening 34 to which an inflator is attached is formed in the center part of the rear woven fabric. That is, a textile article is fabricated such that when a gas is produced by an energized inflator, a substantial part of gas permeates through gaps in the textile structure on the inflator attached side while substantially no gas permeates through the textile structure gaps in the other surface. For example, the range of the weft yarns in which a warp yarn is linked to, for example, upper and lower weft yarns 32T, 31T is increased and decreased suitably, and accordingly, the air-permeabilities of the driver's side woven fabric 31 and the handle side woven fabric 32 are made to be different from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to airbags. More specifically, the present invention relates to an airbag that has excellent performance as an airbag and can be manufactured at low cost.

[Conventional technology]

The use of airbag devices is recommended to prevent personal injury due to automobile collisions. The airbag system consists of a sensor that detects a collision of a vehicle, a gas generator that inflates the bag based on a signal from the sensor, and an airbag that inflates with gas and absorbs the impact on the occupants in the event of a collision.

This airbag is formed by coating the entire surface of a woven fabric and then sewing it. Furthermore, this hack has
There are multiple vent holes to vent the gas.

The basic performance of airbags is that they have sufficient pressure resistance, are easy to store inside a car, and are easy to deploy when gas is introduced into the airbag.
An airbag that satisfies these basic functions is made by sewing a woven fabric made of nylon 66 filaments into a bag body, and coating the entire surface of the woven fabric with a coating such as chloroprene to reinforce the sewn parts. Are known.

[Problem to be solved by the invention]

Although the above-mentioned conventionally known airbags satisfy the basic performance as an airbag, they have various problems as described below.

In other words, conventionally known airbags are formed by coating the entire surface of a woven fabric as described above and then sewing it. However, this increases the coating cost, increases the weight of the airbag, and reduces the deployability of the bag. It is decreasing.

Furthermore, when an airbag is used, the inflator is activated and gas is generated, causing the airbag to inflate rapidly, so it must be sewn to withstand the pressure that is applied at that time. This is one of the reasons for increasing the manufacturing cost of the airbag. Therefore, an airbag that does not require sewing or at least has a reduced sewing area would be advantageous in terms of manufacturing costs, but no airbag that satisfies this requirement currently exists.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems of conventionally known airbags and provide an airbag that has excellent performance as an airbag and can be manufactured at low cost.

[Means to solve the problem]

An object of the present invention is to provide an airbag woven into a bag shape from two sets of warp threads, wherein the two sets of warp threads are integrally joined by a weave structure of the warp and weft at the periphery of the airbag. , One side has a hole in the center for installing an inflator, and when the inflator, which is a gas generator, operates and generates gas such as N2, most of the gas permeates through the gap in the fabric structure on the side where the inflator is installed. This is achieved by a hollow weave air bank characterized in that the fabric is constructed so as to allow the air to pass through the fabric, and gas hardly permeates through the gaps between the fabric structures on the other side.

That is, the inventors of the present invention sought to create a low-cost airbag in which the airbag base fabric is flexible and lightweight, has good storage properties, and good deployability when the inflator is activated.

As a result, the woven fabric on the driver's seat side has a density that makes it difficult for gas to permeate through the gaps in the woven fabric, giving it the ability to instantly deploy the airbag when the inflator is activated. Rather than forming airbags by sewing after weaving these woven fabrics with different functions in advance,
We have invented a method for manufacturing bag-like airbags made of woven fabrics each having a different function from a group of warps.

The following three methods can be used to simultaneously weave two types of woven fabrics with different functions. The first method is to make the pitch of the reed feathers uniform throughout, and to use threads with a thicker denier for the warp and weft of the woven fabric on the driver's seat side than the warp and weft of the woven fabric on the steering wheel side. In addition, in the warp preparation process, thick denier warp threads and relatively thin denier threads are arranged alternately, and when weft thread driving, large denier weft threads are used for thick denier warp threads, and fine denier weft threads are arranged for thin denier warp threads. This is a method of typing.

The second method is to make the thicknesses of the two groups of warps and all the wefts the same, and to make the warp density of the woven fabric for the driver's seat higher than that of the woven fabric for the steering wheel side. Specifically, the warp threads of the woven fabric for the driver's seat are drawn in for each reed, and the warp threads of the woven fabric for the steering wheel are drawn in for each reed.
This is achieved by pulling in trees, etc.

The third method is to make the pitch of the reed feathers uniform throughout, and to use threads of the same denier for both warps and all wefts, but for the driver's seat side fabric, both the warp and weft are non-twisted, and the steering wheel is Side-woven fabric is produced by twisting one or both of the warp and weft yarns.

As mentioned above, the airbag according to the present invention has two groups of warp yarns around the airbag organized by weft yarns, and the joints of this woven structure are arranged in an endless manner at positions on the woven fabric during weaving. , it is possible to provide a space between two woven fabrics made by intersecting two sets of warp yarns with their respective weft yarns, and to provide a joint by the woven structure around the space. The airbag according to the present invention can be obtained by cutting the peripheral joint made in this way to a predetermined width after weaving, and cutting the handle side woven fabric at an appropriate position to provide an opening for attachment.

Conventionally known airbags have the function of coating the entire surface and/or back surface of the airbag to suppress gas exhaust and to increase the strength of the sewn portion and the opening for the handle around the airbag. In the airbag according to the present invention, the strength of the joint can be further increased by applying a partial coating having l] around the joint of the woven structure around the air pack. Furthermore, by partially coating the periphery of the inflator mounting opening, the inflator can be mounted more firmly. If the coating is partially applied in this manner, an airbag that is lightweight, compact, soft, and easy to deploy can be obtained.

The airbag has a plurality of bolt holes in the vicinity of the mounting opening, and is mounted to the vehicle body by bolts inserted into the bolt holes. Also, an inflator is usually attached to this attachment opening.

The shape of the hollow part formed inside the peripheral joint formed by the woven structure in the airbag can be arbitrarily selected by conventional weaving techniques.

That is, it is sufficient to operate the Jacquard device according to a predetermined schedule to determine the shedding procedure for the warp threads. However, in the case of a driver's airbag, it is usually woven to form a circular hollow part.

The width of the peripheral joint is selected to be such that the warp and/or weft yarns constituting the fabric on both sides of the hollow part do not slip through the peripheral joint when the airbag is inflated. In addition, during normal weaving, the warp threads are organized with the weft threads in a warp-curved structure, so the resistance is strongest when trying to pull out multiple warp threads that have a warp-curved structure, and in that case, the pull-out resistance in the weft direction is - The resistance is lowest when the warp/weft woven structure is pulled in the bias direction. Therefore, it is preferable to change the width of the peripheral joint according to the value of the pulling resistance so that the pulling resistance is equal to the pig intestine in all directions when viewed from the hollow part.

The thread used in the airbag of the present invention is nylon 6.
6, nylon 6, polyester fibers, aramid fibers, various polyamide fibers, and various polyester fibers can be used. Among these fibers, nylon 66 multifilament is preferably used because of its excellent high strength. The thickness of the thread used can range from 210 d to 1260 d, and 840 d is usually used. When using 840 d nylon 66 multifilament, it is preferable to weave with 25 to 35 threads per thread for both warp and weft.

-The air permeability of the woven fabric (hollow part) of the airbag of the second hand invention is 2 cc/c+fi/5 for the woven fabric on the driver's seat side.
ec (based on Fraginyl method) or less is preferable, and 5 to 30 cc/cnT/sec for handle side woven fabric
is preferred.

The resin used for coating is chloroprene rubber,
Synthetic rubbers such as urethane rubber, silicone rubber, and acrylic rubber are used.

The method for coating the woven fabric at a predetermined position can be carried out by a conventionally known textile processing method.

In this case, an emulsion type is preferable to a solvent type due to processing problems, and in the case of an emulsion type, in order to prevent materials such as chloroprene from penetrating into the woven fabric, the coating material must be coated in advance to make it difficult to penetrate. It is more preferable to perform a process such as calendering on the surface of the woven fabric.

The present invention will be described in detail below with reference to the accompanying drawings showing various examples of the airbag of the present invention.

FIGS. 1 and 2 show an example of the basic structure of a driver airbag according to the present invention. Figure 1 (A) is the front side of the airbag (driver's seat side when installed inside the car), Figure 1 (B)
indicates the back side of the airbag (handle side when installed inside the car). FIG. 2 shows a sectional view of the airbag 30 in an inflated state.

As shown in FIGS. 1 and 2, the airbag 30 has a front side woven fabric 31 and a back side woven fabric 32, which are integrally joined at the periphery 33 by the weave structure of each warp and weft. Furthermore, there is a mounting opening 3 in the center of the back side.
4 are provided.

In order to obtain a fabric having such an outer peripheral part 33 joined by the warp and weft weaving structure and having a hollow part in the center,
For example, as shown in FIG. 3, two airbags 30a, 30b, or 30c, 30d are arranged in the weft direction, and one airbag 30a is arranged in the warp direction.

30c, 30b, and 30d are lined up, and the white parts are each independently two woven fabric parts (31 in Figure 1).
, 32) is formed, and in the shaded area, each warp group of the two woven fabric parts, that is, 2 Mi warp groups are joined together by the weft. . Fabric woven in this way 35
is indicated by the broken line 36a in FIG.

What is necessary is just to cut along the lines shown by 36b, 36c and 36d.

In the example shown in FIG. 3, the two sets of warp threads are joined together by the weft threads in the entire area other than the part where the bag is formed by the two woven fabric parts, which is shown by the white part.
The broken lines 36a, 36b, 36c and 36d
The outer portion may be formed with a normal hollow weave structure, that is, two woven fabrics 31 and 32.

FIG. 4 shows an example of a method for weaving the two circular bag-shaped woven fabrics shown in FIG. 3. Reference numbers 1 to 2 in Figure 4
1 indicates each warp, the upper side shows the warp for the woven fabric on the handle side, the lower side shows the warp for the woven fabric on the driver's seat side, and reference numbers 25 to 28 indicate the wefts to be woven.

First, in FIG. 4(A), the weft 25 is intertwined with the upper warp and the lower warp between warps 1 to 5 as shown in the figure, and after weaving, only the upper warp is interwoven between warps 7 to 21. confound with. In FIG. 4(B), the next weft 26 is shown in FIG. 4(A).
As in the case of , after the warps 1 to 5 intertwine with the upper warp and the lower warp, the warps 7 to 21 intertwine only with the lower warp. Furthermore, regarding the next weft yarns 27 and 28, as shown in FIG. 4 (C) and FIG. There is one more warp thread than in the case of A) and Fig. 4(B), resulting in warp threads 1 to 6. By weaving while appropriately increasing or decreasing the warp range of the weft intertwined with the upper warp and the lower warp, we can create the woven fabric on the driver's seat side (31 in Figure 1) and the woven fabric on the steering wheel side. The shape of the hollow portion formed from the dough (FIG. 1, 32) can be made into a desired shape.

FIG. 5 shows an example in which the width of the peripheral joint part 33 in the airbag of the present invention is changed depending on the position of the peripheral joint part 33. That is, the widths are changed according to the relationship of width dt<width dw<width dc in the figure. This is because if the vertical direction in the figure is the warp, the warp usually has a lightly oiled structure in the fabric, so the pullout resistance of the thread when the airbag is inflated is large, and on the other hand, the part where the warp and weft intersect diagonally ( This is because the weave structure in the area indicated by dc is most likely to collapse due to the internal pressure within the airbag. The pull-out resistance of the yarn depending on these positions varies depending on the properties of the yarn used, the thickness relationship, and the weaving structure, so the relationship among the widths dt, dw, and dc is not limited to the above relationship, but can be determined by experiment each time. good.

The airbag 30 of the present invention is just as it is! However, it may be used by partially coating it as described with reference to FIGS. 6 to 8.

Figure 6 shows the coating layer 38 only near the mounting opening.
The airbag 37 shown in FIG. The coating layer 38 in this case is used for the purpose of reinforcing the mounting opening.

7 and 8 show an airbag 40 in which a coating layer 41 is further provided on the surfaces of the woven fabrics 31 and 32 near the peripheral joint 33 in addition to the airbag 37 shown in FIG.
shows. FIG. 7(A) shows the driver's seat side of the airbag 40, FIG. 7(B) shows the handle side of the airbag 40, and FIG. 8 shows a cross-sectional view of the airbag 40 when it is inflated.

As shown in the figure, the airbag 30 illustrated in FIG. 1 is turned over and the peripheral joint (Fig. 33) is fixed to the woven fabric 31 on the driver's seat side, and the periphery of the mounting opening is further reinforced with the fabric 39. . A coating layer 38 is provided around the attachment opening, and a coating layer 41 is provided on the surface of the fabric 31° 320 near the peripheral joint 33.

Note that the coating layer 38 serves to reinforce the fabric near the mounting opening, and the coating layer 41 serves to strengthen the fabric near the mounting opening.
This helps to reinforce the resistance to pulling out the thread when the airbag is inflated.

〔Example〕

The airbag of the present invention will be further explained below based on examples.

Actual tension U 340 d / 140 f untwisted yarn and 735 d
/ 124 f untwisted nylon 66, prepared with a partial warping machine so that the warp is 1 over, and in Fig. 4 the warp and weft on the driver's seat side 31 are 840 d /
The weft was woven with a single weft so that the warp and weft on the handle side 32 were woven with untwisted yarns of 735 d/124 f. At that time, a jacquard machine was used to obtain the hollow weave shown in FIG. 3. The warp and weft densities were finished to 288 wood/n, and a coating of 100 g/n of chloroprene rubber was applied to the peripheral joints only on the driver's seat side.Using this bag weave, the airbag shown in Figure 6 was fabricated. The air permeability was measured using the Frazier method.The air permeability was 0.3 cc/c on the driver's seat side.
IIl/see, and that on the handle side is 8 cc/
cTIl/sec. With this breathability, it functions well as an airbag, and most of the gas passes through to the handle side, that is, the side where the inflator is attached.Since it is a bag weave, there is no sewing cost, and the average strength is 2.
It weighed 69 kg/inch and provided an excellent airbag.

Point opening 1 Both the warp and weft are made of two types of nylon 66, 840d/140f untwisted yarn and 80T/set twisted yarn,
The warp threads on the driver's side 31 are drawn into a reed with a density of 14 threads/inch in Fig. 4, and the warp threads on the handle side 32 are drawn into a reed with a density of 14 threads/inch. The warp threads were drawn into a reed with a density of 14 warps/inch. 840
Two types of weft yarns were woven with a single weft so that the untwisted weft yarns of d/140 f were arranged on the driver's seat side, and the twisted yarns of 840 d/140 f and 80T/pair were organized on the handle side. At that time, a jacquard machine was used to obtain the hollow weave shown in FIG. 3.

The warp density and weft density on the driver's seat side are each 32 wood/inch,
The warp density on the handle side is 16 wood/inch and the weft density is 322.
Finished with wood/, the peripheral joint on the driver's seat side is coated with 80g/rrf of chloroprene rubber, and the peripheral joint on the handle side is coated with 20g/nf of chloroprene rubber. The air bank shown in the figure was created and its air permeability was measured using the Frazier method. 0.2 cc/c+fl/s e on driver's side
c, and that on the handle side is 25 cc/ca/
It became sec. On the handle side, the warp and weft are twisted yarns, so the yarns are bunched together, and the warp density is low, increasing the void ratio in the fabric, so if it has this breathability, it will function well as an air bag, making it easy to remove the inflator. An excellent airbag was obtained in which most of the gas permeated from the sides.

〔Effect of the invention〕

Since the airbag of the present invention is constructed as described above, there is no need for sewing to form it into a bag shape, and as a result, the airbag can be manufactured at low cost. Also, since the breathability of the woven fabric on the driver's side and the woven fabric on the steering wheel side differs depending on the woven structure, the coating usually applied to the airbag is
Even if it is necessary, it can be limited to the minimum necessary area for ventilation adjustment and reinforcement, and as a result, it is possible to obtain an airbag that is lightweight, compact, soft, and easy to deploy. can.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the driver's airbag of the present invention, in which FIG. 1(A) shows the driver's seat side, FIG. 1(B) shows the steering wheel side, and FIG. 3 is a sectional view of the airbag shown in FIG. 1, FIG. 3 is a plan view of the fabric for explaining the method of weaving the airbag shown in FIG. 4(A) to 4(D) each show the intertwined state of one weft yarn and multiple warp yarns, and FIG. FIG. 6 is a plan view showing an example of an airbag in which the width of the peripheral joint varies depending on the position of the peripheral joint; FIG. 6 is a cross-sectional view showing an airbag in which the vicinity of the mounting opening is coated; Fig. 8 shows an airbag in which the surface of the fabric on the driver's seat side and the steering wheel side near the peripheral joint is further coated in addition to the airbag shown in Fig. 6; FIG. 7(B) is a plan view showing the handle side, and FIG. 8 is a sectional view. 1-21...Warp, 25-28...Weft, 30
, 30a, 30b, 30c, 30d30
A, 30B, 30C, 30D, 33...
Airbag, 31... Woven fabric on the driver's seat side, 32... Woven fabric on the steering wheel side, 33... Peripheral joint, 34... Installation opening, 3
6a, 36b, 36c, 36d--cutting line, 39--cloth, 37, 40--partially coated air pack, 38, 41--partial coating layer. Figure Figure

Claims (1)

[Claims] An airbag woven into a bag shape from one or two sets of warp threads, the two sets of warp threads are integrally joined at the periphery of the airbag by a weave structure of the warp and weft threads, and one side is woven in the central part. A hole is drilled for installing the inflator,
The fabric is constructed so that when the inflator operates and gas is generated, most of the gas permeates through the gaps in the fabric structure on the side where the inflator is installed, while almost no gas passes through the gaps in the fabric structure on the other side. A bag weave airbag characterized by: