JPH07300056A - Hollow woven air bag backing cloth - Google Patents

Abstract

PURPOSE:To provide a hollow woven air bag of high reliability, increasing connection binding power of the hollow woven air bag, increasing burst power and eliminating damage of the bag in an inflation test. CONSTITUTION:A bag comprises two sheets of cloths of obverse/reverse fabrics 2, 3, to form peripheries of the obverse/reverse fabrics 2, 3 as a single sheet of cloth by a connection binding single woven band 4, and the connection binding single woven band 4 and the double hollow woven parts 2, 3 are connection- cross woven by placing two warps 5 or two wefts 6 in a paralleled condition in warp/weft direction center parts, so as to weave the double hollow woven parts 2, 3 in plain weaving and the connection binding single woven part 4 in 2/2 bias weaving.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing hollow weave airbag used for protecting an occupant of an automobile.

[0002]

2. Description of the Related Art In recent years, an airbag system has been put into practical use and is being installed as a safety device for protecting an occupant for preventing personal injury due to a collision accident of an automobile. The airbag system is composed of a sensor that detects a vehicle collision, a gas generator (inflator) that inflates the airbag based on a signal from the sensor, and an airbag that inflates with a gas at the time of a collision to absorb an impact of an occupant. ing.

Therefore, the air bag has a hollow weave portion for containing gas, and has a mounting port for mounting the gas generator and a mechanism for discharging gas from the inflated air bag (for example, vent hole, air bag base). (Discharge from the cloth weave) is provided. Such an airbag is
Conventionally, a high-strength synthetic fiber such as nylon 66 multifilament is used to make a woven fabric. For example, in the case of an airbag for a driver seat, two substantially circular woven fabrics are cut from this woven fabric and the peripheral portions of the two woven fabrics are sewn by sewing. It is formed by joining, and then a gas generator mounting port and a gas discharge mechanism are provided. Prior to sewing, the fabric is usually coated.

[0004] The above-mentioned conventionally known sewn airbag has various problems associated with sewing, such as reliability of joining by sewing and cost increase due to sewing work.
Therefore, in order to solve the problem of an airbag having a peripheral portion joined by sewing, a bag-weaved airbag in which the peripheral portion is joined by a knotted single-layered structure is disclosed in JP-A-1-254446.
It is proposed in Japanese Patent Publication No.

[0005]

The structure and problems of the bag-weaving airbag will be described with reference to FIGS. 4 (A) and 4 (B). FIG. 4A is a plan view showing an example of a conventionally known bag-woven airbag. As shown in FIG. 4 (A), a conventionally known bag-woven airbag 7 is composed of a front side fabric 8 (driver side during use) and a back side fabric 9 (handle side during use), and is attached to the outer peripheries of the front side fabric 8 and the back side fabric 9. Yuichi Heavy Tissue 1
0 is formed into a strip shape, and as a result, the front side fabric 8 and the back side fabric 9 are formed.
A double hollow weave portion d is formed between the two. A gas generator mounting port (not shown) is provided at the center of the back side fabric 9.

FIG. 4 (B) is an enlarged schematic diagram showing a state in which the double hollow weave portion d is joined to the jointed single-tissue portion 10 when the γ-γ ′ line of FIG. 4 (A) is cut and expanded. It is a figure. As shown in FIG. 4 (B), the binding single-layered fabric portion 10 has the front side fabric 8
The warp yarns 11 and the warp yarns 11 ′ of the back side fabric 9 are respectively joined to the weft yarns of the single-tissue binding structure 10 by one each, and although not shown, one weft yarn for the front side fabric 8 and one weft yarn for the back side fabric 9 are provided. Is joined to the warp yarn of the single-tissue knitted fabric portion 10.

In the inflation test using the hollow weave airbag 7 as described above, the hollow weave portion d has a circular shape at the portions 12, 13, 14, 15 in the yarn axis direction (the portion where the X-axis and the Y-axis intersect the single tissue portion). 1 of the boundary forming the tangent line on the single tissue side
Since the warp yarn or the weft yarn of the book intersects with a large number of orthogonal yarns, there is a problem that stress concentrates on one yarn at this portion and breaks at this place.

As a countermeasure for this, Japanese Patent Laid-Open No. 4-43141
In the publication, an airbag is proposed in which the cover factor of the warp yarn and the weft yarn in the axial direction of the yarn is formed to be higher than the cover factors of other portions, and as a result, the strength of the joint is increased and the inflation resistance is improved. Has been done. However, the above-mentioned proposed technique has problems that it is complicated at the time of manufacturing the airbag, and if the cover factor of the double-bag weave portion d is 2000 or more, weaving is difficult due to generation of warps.

In order to solve the above problems, the present invention enhances the binding strength of the portions 12, 13, 14, 15 in the axial direction of the yarn, the burst strength of the airbag is high, and the bag is not damaged in the inflation test. The purpose is to provide a non-reliable woven airbag.

[0010]

SUMMARY OF THE INVENTION That is, the present invention relates to a double weave portion of a double weave portion in which the outer circumference of a circular double double weave portion for a fluid introducing portion is joined by a band of a connecting single-tissue structure. The central belt in the warp direction and the central belt in the weft direction are hollow weave airbags in which the single weave portion and the hollow weave portion have two warp threads or weft threads joined and interwoven in an aligned state.
Further, the double weave portion has a plain weave structure, the knotted single weave portion has a weave structure, and the knotted single weave portion that joins with the double weave part has a 2/2 weave structure. It is a hollow weave airbag formed of a tissue.

The term "circle" as used herein means a circle, an ellipse close to a circle, and a polygon that can have a shape close to a circle when expanded. The fact that the single weave portion and the hollow weave portion are joined and interwoven with two warp threads or weft threads aligned with each other means that the front and back warp threads or the front and back weft threads of the double hollow weave section are two, respectively. This means that the yarns are joined together with the single-tissue portion, and the joined yarns are referred to as binding yarns.

In the structure of the present invention, the parts 12, 1 in the yarn axis direction
3,14,15, that is, the warp-direction central band and the weft-direction central band are arranged in parallel, so that the strength of the hollow weave portion is increased, and the strength at the joint portion with the single weave portion is also increased. Increase. In the case where the number of binding yarns of the present invention is other than the two aligned state,
For example, in the case of one, the joint strength is weak, and as a result, the burst strength is insufficient. On the other hand, if the number is three or more, the strength of the knotted portion becomes high, but it cannot be produced unless the knotted single-ply structure portion has a regular weave or a variable weave structure of 3/3, 4/4 ... However, in a twill weave in which a large number of such yarns are aligned, the woven structure at the boundary between the double hollow weave part and the knotted single structure part becomes loose (texture deviation at the boundary part), especially in the yarn axis direction ( The woven structure of the Y axis and the X axis becomes loose. Therefore, in the inflation test, the hot gas intensively flows out from the position where the tissue is displaced, the bag is damaged, and the improvement of the inflation resistance is hardly achieved. In addition, uneven density of the weft yarns also occurs in the double-pouch part d.

The present invention will be described below with reference to the accompanying drawings showing a preferred example of the hollow weave airbag of the present invention. Figure 1
Shows a plan view of a preferred example of the double-woven airbag of the present invention. FIG. 2 (A) is developed by cutting the α-α ′ line of FIG. 1 and FIG. 2 (B) is cut by the β-β ′ line of FIG. FIG. 3 (A) to FIG. 3 (E) are enlarged schematic views showing a state in which the double hollow weave portion is joined to the joined single tissue portion, and FIGS. 3 (A) to 3 (E) are for obtaining the double weave airbag shown in FIG. 1. The organization chart is shown.

As shown in FIG. 1, an airbag 1 of the present invention is composed of two woven fabrics, a front side woven fabric 2 and a back side woven fabric 3, and the outer peripheries of the front side woven fabric 2 and the back side woven fabric 3 are formed by a band of a binding single-ply tissue portion 4. It is formed as one piece of fabric, and as a result, a double hollow weave portion d is formed between the front side fabric 2 and the back side fabric 3. As shown in FIG. 1, the double-woven airbag 1 has a width symmetrical with respect to the Y axis in the warp direction and the X axis in the weft direction at the center of the circle, and the width is about 10% of the diameter of the circle. Only weave so that two binding yarns form one set. More specifically, with respect to the warp direction of the central band a, FIG. 3 (A) is used for the design of the knotted single weave part 4 and FIG. 3 (B) is used for the design of the double hollow weave part d. Further, regarding the weft direction of the central belt b,
The structure of the bonded single-layered structure part 4 is shown in FIG.
3C is used for the tissue of FIG. 3, and FIG. 3D is used for the portion s where the central band a and the central band b overlap. In addition, the double structure portion other than the central zones a and b is woven with the structure shown in FIG. 3 (E). Thus, in the central belts a and b, in the warp direction, as shown in FIG. 2 (A), the binding single-ply structure portion 4 includes the warp yarn 5 of the front side fabric 2 and the warp yarn 5'of the back side fabric 3. In the weft direction, as shown in FIG. 2 (B), the binding single-ply structure portion 4 aligned two weft yarns 6 of the front side fabric 2 and the weft yarns 6 ′ of the back side fabric 3 in the weft direction. A hollow weave airbag joined in a state is obtained. Note that the structure of the bonded single-tissue part 4 is shown in FIG.
In (A), the design of the double-woven weave portion d may be two binding yarns in the entire boundary portion between the single-knitted single-tissue portion 4 and the double-woven double weave portion d by using FIG. 3 (D).

Next, a weaving method for obtaining the hollow weave airbag 1 will be described. The warp threads are drawn into the reeds in order, and the openings of the warp threads are shown in FIG. 3 (A) and FIG.
3B, FIG. 3D, and FIG. 3E, the pattern data is created in advance so as to move according to the organization chart, and the data is input to the electronic jacquard. Therefore, the weft insertion in the double woven portion d of the central belt b involves inserting the wefts in the order of front side / front side / back side / back side / front side / front side. The boundary part of d is joined with two binding yarns,
Weft insertion in the double-bag weave part d other than the central belt b is performed on the front side, the back side,
The wefts are inserted in order from the front side to the back side, and the boundary portion between the binding single-ply tissue portion 4 and the double hollow weave portion d is joined with one binding yarn. As a result, the strength of the knotting portion of the warp and weft in the direction of the thread axis (X axis, Y axis) was increased, and burst strength and inflation resistance were improved. The weaving machine for weaving the bag-weaving airbag is limited to a loom equipped with a jacquard.

[0016]

EXAMPLES The present invention will be described below with reference to examples, and the physical properties of the examples will be compared. The air bag binding strength measurement was carried out on the sample shown in FIG. That is, as a sample, a sample in the warp direction indicated by Cw in FIG.
Samples in the weft direction shown in Fig. 5 and samples in the bias direction shown in Cb were sampled (200 mm x 80 mm) from the corresponding bag weaving bags, and as shown in FIG. 25mm at the boundary of
Make a notch.

As shown in FIG. 6, these test samples are attached to a woven fabric tester at a grip distance of 200 mm between the grip 16 of the front side fabric and the grip 17 of the back side fabric. At that time, an initial load is applied so that the joint 18 is located at the center between the grips, and the test is conducted under the condition of a pulling speed of 200 ± 2 mm / min. The strength N / 30 mm when the joint is broken is measured, and the one cut near the grip is excluded, and the average value of three measurements is shown.

Next, in the burst test, a balloon 21 larger than the airbag is put into the airbag 20 by using the burst test apparatus shown in FIG. 7, and then fixed to the airbag mounting plate 22 using the fixture 23. To do. The pressure (kg / cm ² ) when the airbag 20 ruptures is determined by the pressure gauge 24 while the supply amount of the high pressure air 19 is adjusted by the pressure adjusting valve 25.

In the inflation test, the airbag 20 to be measured using the device 26 shown in FIG. 8 is fixed to the inflator (4 by Morton Co., Ltd.) 28 with the bolts 29 through the fittings 27, and the storage case 30 is riveted or the like. Store in. This case is left in a constant temperature bath at 80 ° C. for 4 hours, and within 2 minutes after being taken out, the ignition power source 31 ignites the inflator 28 to inflate the airbag 20.

Example 1 The hollow weave fabric for an air bag of the present invention shown in FIG. 1 was woven according to the following specifications. Thread usage Warp Nylon 66 420d / 70f Weft Nylon 66 420d / 70f Number of reeds 36 / K Dimension Number of warp thread pull-in 4 / Woet insertion density 101 / inch width 94.4cm Weaving machine Through-the-louch G6200 Jacquard Stäubli CX960 / JC4 Double hollow weave, 710 cm in diameter, circular outer circumference, single-tissue width of 15 mm 〃 tissue clincher (2/2) Number of knotting yarns a, b zone 2 a, b zone 1

Example 2 Tissue of outer peripherally bonded single-layered structure part Oblique (2/2) Number of binding yarns a, b band 2 a, b outside band 2 Weaving under the same conditions as in example 1 except for the above conditions did.

[Comparative Example] Comparative Example 1 Periphery-bonded single-tissue structure structure Oblique (2/2) Number of knotting yarns a, b band 1 a, b band 1 outside 1 Example other than the above conditions Woven under the same conditions.

COMPARATIVE EXAMPLE 2 Tissue of outer peripheral tie single weave part Oblique (3/3) Number of tie yarns a, b band 3 pcs a, b outside 1 band Weaving under the same conditions as in Example 1 except for the above conditions did.

Table 1 shows the binding strength / burst strength values of the four types of hollow weave airbags of Examples 1 and 2 and Comparative Examples 1 and 2 and the comparison results of the inflator test. As shown in Table 1, in Examples 1 and 2 of the present invention, the strength of the joint was increased, and as a result, the burst strength was increased and the bag was not damaged in the inflation test.

On the other hand, the tenacity of the binding portion of Comparative Example 1 is lower in the warp direction and the weft direction than in the bias direction. As a result, in the burst test and the inflation test, the bag damage was biased in the yarn axis direction. The binding portion strength of Comparative Example 2 is higher in the warp direction and the weft direction than in the bias direction,
In the burst test, the burst portion was not biased in the yarn axis direction, but was located around the inflator attachment port. However, in the inflator test, since the 3/3 oblique structure is used for the single structure part, the woven structure at the boundary between the double hollow weave part and the bonded single structure part becomes loose, and hot gas concentrates from there. And the bag was damaged in the yarn axis direction.

[0026]

[Table 1]

[0027]

Since the hollow weave airbag according to the present invention is constructed as described above, the strength of the joint portion can be increased, and as a result, the burst strength and the inflation resistance can be further improved. Further, the hollow weave airbag according to the present invention has an advantage that an excellent airbag can be obtained at the same cost because it can be carried out only by changing the woven fabric design when weaving a conventionally known hollow weave airbag.

[Brief description of drawings]

FIG. 1 is a plan view of a double-woven airbag according to the present invention.

2 (A) is an α-α ′ line in FIG. 1, and FIG. 2 (B) is FIG.
FIG. 6 is an enlarged schematic view showing a state in which the double hollow weave portion is joined to the joined single tissue band when the β-β ′ line of FIG.

3 (A) to 3 (E) are organization charts for obtaining the hollow weave airbag shown in FIG. 1.

FIG. 4A is a plan view of a conventionally known double-woven bag, and FIG. 4B is a double-woven double-woven structure in which a double hollow weave part is joined and cut when the γ-γ ′ line of FIG. An enlarged schematic diagram showing the state where it is joined to a belt.

FIG. 5A is a position diagram for collecting a sample for measuring the strength of a joint, and FIG. 5B is an explanatory diagram for preparing a sample for measurement.

FIG. 6 is an explanatory diagram of a method for measuring the strength of a joint portion.

FIG. 7 is an explanatory diagram of a burst test measuring device.

FIG. 8 is an explanatory diagram of an inflation test device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... The hollow weave airbag 2 of this invention 2,8 ... Front side woven fabric 3,9 ... Back side woven fabric 4,10,18 ... Bound | bonded single structure part 5,5 ', 11, 11' ... Warp yarn 6,6 '... Weft yarn 7 ... Conventionally known bag-woven airbags 12, 13, 14, 15 ... Portion in the yarn axis direction 16, 17 ... Gripping portion 19 of fabric ... High-pressure air 20 ... Airbag 21 ... Balloon 22 ... Airbag mounting plate 23 ... Mounting tool 24 ... Pressure gauge 25 ... Pressure adjusting valve 26 ... Inflation device 27 ... Mounting bracket 28 ... Inflator 29 ... Bolt 30 ... Storage case 31 ... Ignition power supply 32 ... Measuring hole 33 ... Pressure gauge 34 ... Strain gauge 35 ... Recorder

Claims (2)

[Claims] 1. A hollow weave airbag in which an outer periphery of a circular double hollow weave portion for a fluid introducing portion is joined by a band of a binding single-tissue portion, wherein a double central weave portion of the double hollow weave portion has at least a central band (a) and a warp direction central band (a). The central band (b) in the weft direction is a double-woven airbag in which the single weave portion and the hollow weave portion are joined and interwoven with two warps or wefts aligned. 2. The double weave portion has a plain weave design,
2. The structure of the binding single-ply tissue part is a weave, and the single-ply binding part to be joined to the double hollow weave part is formed of a 2/2 weave weave structure. The bag weaving airbag described.