JPH05124478A - Air bag of cylindrical section - Google Patents

Abstract

PURPOSE:To provide an air bag of cylindrical section which can be provided with standard seam strength without using any patching cloth. CONSTITUTION:The cover factors of sewing ranges 12, 12A, 12B of at least one woven fabric piece 2 among a plurality of woven fabric pieces 2, 3, 4 used for joint parts formed by involving sewing process is made larger than the cover factor of the outside 11, 11 of the sewing ranges.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an air bag.
More specifically, the present invention relates to an air bag having a cylindrical cross section used for a passenger seat or a rear seat.

[0002]

2. Description of the Related Art The use of an air bag device is recommended to prevent personal injury resulting from an automobile collision. The airbag device includes a sensor that detects a collision of an automobile, an inflator that generates gas that inflates the bag based on a signal from the sensor, and an airbag that inflates by the gas and absorbs a shock to an occupant. The air bags are roughly classified into driver seat air bags and passenger seat or rear seat air bags. In the latter airbag, conventionally, as shown in FIG. 5, one rectangular woven cloth 22 is joined at a joining line S4 to form a cylindrical shape.
End face fabrics 23, 24 are provided on both end faces of the cylindrical woven fabric 22.
Are joined by joining lines S5 and S6. Since the air bag 20 is rapidly inflated by supplying a high-pressure gas, if a strong joint is not formed, the gas may leak from this part or the air bag may sometimes burst. As a result, reliable protection of the occupant cannot be achieved.

Therefore, in a conventionally known air bag for a passenger seat or a rear seat (hereinafter referred to as a cylindrical cross-section air bag for convenience of description), a reinforcing cloth is used along a joining line as shown in FIG. FIG. 6A is a cross-sectional view showing an example of a joined state of the woven fabric 22 and the end woven fabric piece 23 along the virtual plane X ₁ -Y ₁ of FIG. 5, and FIG. 6B is a virtual view of FIG. both end portions 22A of the fabric 22 with respect to the plane X ₂ -Y _2, is a sectional view showing an example of a bonding state of 22B. As shown in FIG. 6 (A), the woven fabric 22
When joining the woven fabric piece 23 and the end woven fabric piece 23, at least one reinforcing cloth 27a, 27b (two reinforcing cloths in the case shown in the figure) is arranged on both sides of the combined end, and the woven cloth 22 and the end are joined together. Together with the respective ends of the partial fabric piece 23, they are integrally joined by sewing (sewn thread 28) to form a joint end 26.
In order to make the joining more reliable, an adhesive may be used together, and as the reinforcing cloths 27a and 27b, the airbag 2 is used.
It is preferable to use a cloth conforming to the cloth that constitutes the main body of No. 0, and to coat this cloth.

At the time of joining both ends 22A and 22B of the woven cloth 22, as shown in FIG. 6B, at least one reinforcing cloth 30a, 30b (in the case shown in the drawing) is provided on both sides of the combined end. 2 pieces of reinforcing cloth, 2 pieces each are arranged, and the woven cloth 22
Sew together with both ends 22A and 22B (sew thread 31)
Are joined together to form a joining end portion 29. Although not shown in FIG. 5, the air bag is provided with an inflator mounting opening and a vent hole for appropriately discharging gas from the inflated air bag, and the surroundings of the inflator mounting hole and the vent hole are also made of a reinforcing cloth. It is reinforced.

[0005]

As described above, in the conventionally known air bag of cylindrical cross section, the sewing using the reinforcing cloth is performed at each portion thereof. If you use a reinforcement cloth, you can strengthen the sewing area, but with sewing using a reinforcement cloth,
In addition to sewing for joining the woven fabric piece of the air bag to another woven fabric piece, it is necessary to sew the reinforcing cloth itself to the woven fabric piece of the air bag. As a result, the sewing cost increases, which further increases the manufacturing cost of the airbag, which is not preferable.

The present invention provides a cylindrical cross-section air bag which can solve the problems of the above-described conventional publicly known cylindrical cross-section air bag, reduce the sewing cost, and can surely form the joint portion. The purpose is to provide.

[0007]

The above object of the present invention is an air bag having a substantially cylindrical cross section made by subjecting a plurality of woven fabric pieces to a joining process including sewing. A cylinder characterized in that the cover factor of the sewn area of at least one woven fabric piece of the plurality of woven fabric pieces used for the joint formed including sewing is made larger than the cover factor outside the sewn area. Achieved by a profiled airbag. The cover factor K is expressed by the following equation. K = woven density x √ denier of yarn used

Therefore, in order to increase the cover factor K, the yarn to be used may be thickened or the weaving density may be increased, or they may be used in combination. The area for increasing the cover factor may be provided in at least one of the plurality of woven fabric pieces used for the joint portion, but more preferably in all the woven fabric pieces.

The present invention will be described below with reference to the accompanying drawings showing an example of a cylindrical sectional airbag of the present invention. Figure 1
1 shows a cylindrical cross-section airbag 1 of the present invention. In the air bag 1, the body woven fabric piece 2 is rolled up and the end regions 2A and 2B are S-shaped.
Join with the sewing line shown by ₁ , and put the end cloth piece 3 into the body cloth piece 2
Of bonded sewing line indicated by S ₂ on one end, it is formed by joining the end fabric piece 4 in sewing lines indicated by S ₃ in addition to the one end of the body fabric piece 2.

FIG. 2 (A) is a perspective view showing in detail the joint shown by A in FIG. 1, and shows the sewing areas 12A, 12B of the body cloth piece 2 in the respective end areas 2A, 2B. The cover factor K is made larger than the cover factors K of the other areas 11A and 11B, and sewing is performed with the sewing thread 6 to form the sewn portion 7. As shown in the figure, the width of the sewing areas 12A and 12B of the body woven fabric piece 2 is made larger than the width of the sewing portion 7. FIG. 2B is a detailed perspective view of the joint shown by B in FIG. 1, in which a sewing area 12 having a large cover factor K is provided at one end of the body cloth piece 2, and the end cloth piece is provided at this portion. A sewn portion 9 is formed by sewing the end of 3 with the sewing thread 8. Also in this case, the width of the sewing area 12 is made larger than the width of the sewing portion 9.

A weaving method of the body woven fabric piece 2 used to obtain the air bag 1 shown in FIG. 1 will be described with reference to FIGS. 3 and 4. In FIG. 3, the arrow indicates the weaving direction,
Areas 12A and 12B having a large cover factor K are provided in the vicinity of the selvages along the warp direction, and areas having a large cover factor K in the weft direction are provided at intervals corresponding to the desired length of the airbag 1 in the warp direction. 12 are provided on both sides. Areas 11 and 11 other than the areas 12A and 12B and the area 12 are woven so as to have a cover factor K of a value required for the construction of the airbag. The next woven fabric piece 2 is woven by providing the areas 12 at intervals outside the area 12.

Next, by cutting at the position within the area 11 indicated by the alternate long and short dash lines 13A and 13B in FIG. 3, the woven fabric piece 2 shown in FIG. 4 is obtained, and the end woven fabric pieces 3 and 4 are provided at both ends thereof. By joining as shown in 1 and 2, a cylindrical cross-section air bag is obtained. In the fabric piece 2 shown in FIG. 4, the area 11 is provided outside the area 12 having a large cover factor, but the area 11 may not be provided.

[0013]

EXAMPLES As described above, as a method of increasing the cover factor, a method of increasing the woven density (the warp density or the weft density) in the sewing area by increasing the density of the corresponding reed wing or the weft density, and Any one of the methods for increasing the thickness of the yarn used in the area, or if necessary, both methods are used together. Specific examples of the above two methods will be described below. In the specific examples, Somet SM93 type-150 was used as the loom.

Example 1 In Example 1, the cover factor was increased by increasing the density of the reeds for the warp and increasing the density of the weft for the weft. That is, in FIG. 3, the sewing areas 12A, 12
The reed density of the reed part corresponding to B was 45.5, and the reed density of the reed part corresponding to the other areas 11 and 11 was 38. Nylon 66 840d / 1 as warp
40f is used, the total number of warp yarns is 1273, and the breakdown is 75 warp yarns (one side) corresponding to the area 11.
There are 60 warps corresponding to the zone 12A, 1003 warps corresponding to the zone 11, and 60 warps corresponding to the zone 12B. In this case, the warp was prepared with one warp. As a result of weaving with such a warp arrangement, the warp density of the raw fabric is 27 yarns / inch in the area 11 , and the areas 12A, 12
B has 32 yarns / inch, and the warp density after coating is 28.5 yarns / inch in area 11 and 3 in areas 12A and 12B.
It became 4 / inch. When this area 12A and area 12B were sewn together, the seam strength was 132 kg at 25 ° C.
Met.

Next, as a weft, nylon 66 840d /
Weaving was performed using 140f with a weft density of 32 threads / inch in the sewing area 12 and a weft density of 27 threads / inch in the area 11 . After coating, weft density is 34 threads / inch in area 12,
It became 28.5 lines / inch in area 11 . When this area 12 was sewn according to the end woven fabric pieces 3 and 4 as shown in FIG. 4, the seam strength was 133 kg at 25 ° C.

Example 2 In Example 2, the cover factor was increased by increasing the thickness of the warp yarn and the weft yarn at the corresponding portions. That is, as the reed, a reed having a reed density of 38 over the entire width is used, and in FIG. 3, 50 nylon nylon 66 1000d / 170f is used for each of the areas 12A and 12B, and the area 11
Nylon 66 840d / 140f, 1003 pieces, and nylon 66 840d / 140f
140f and 50 lines were used. In this case, the total number of warp threads is 1
It was 253. As a result of weaving with such warp preparation, the area 12A, 12B and the area 11 co-warp density 27
A silk machine / inch is obtained, and the warp density after coating is 28.5 threads / inch in area 11 and 2 in areas 12A and 12B.
8 / inch. As described above, the warp density of the coated cloth is not different between the areas 12A and 12B and the area 11 , but the thickness of the thread used is different, so that the cover factor is 12A,
12B becomes 895, which is larger than the cover factor 826 of the other area, that is, the area 11 . As a result, the seam strength of this portion was 130 kg at 25 ° C.

Next, nylon 66 84 is used for the area 11.
Weaving was carried out using 0d / 140f as the weft and nylon 66 1000d / 170f as the weft for the area 12 to obtain a weaving machine with a weaving density of 27 yarns / inch. After coating, the weft density was 28.5 yarns / inch in area 11 and 28.2 yarns / inch in area 12. Thus, there is no difference in the weft density of the coated cloth between the area 12 and the area 11 , but since the thickness of the thread used is different, the cover factor is 8 in the area 12.
92, which is greater than the cover factor 826 of the other area, area 11 . As a result, the seam strength of this portion was 130 kg at 25 ° C.

Comparative Example 1 Nylon 66 840d / 140 for both warp and weft yarns
f, the reed was 38 in width / inch, and one warp was prepared for each one. As a weft, nylon 66 840d /
Weaving was performed using 140f, and the warp density and the weft density were 27 yarns / inch in the raw machine and 28.5 yarns / inch after coating. This weave construction is the same as the weave construction of area 11 of Examples 1 and 2 and the cover factor is 826. When this woven fabric is cut and sewn without using this fabric, the stitch strength is 110 to 11 at 25 ° C. in both the warp direction and the weft direction.
It is 4 kg, which is not enough as the seam strength of the airbag. Therefore, when one piece of this cloth was used for sewing, the stitch strength was 135 kg at 25 ° C, which was a practical value.

As will be easily understood by comparing Examples 1 and 2 and Comparative Example, the cylindrical cross-section air bag according to the present invention can exhibit a strong seam strength without using the cloth. it can. It should be noted that the combination of the cover factor increasing methods in the warp direction and the weft direction in Examples 1 and 2 is only one example, and another combination, for example, the method of increasing the cover factor in the warp direction in Example 1 and the embodiment The method of increasing the cover factor in the weft direction of Example 2 may be combined. However, in consideration of the convenience of weaving preparation, the combinations shown in Example 1 and Example 2 are preferable.

[0020]

In the air bag of the present invention having a cylindrical cross section, the cover factor of the sewn area is made larger than the cover factors of the other areas, whereby the strength of the sewn portion can be secured without using the cloth. Therefore, it helps to reduce the sewing cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a cylindrical cross-section airbag of the present invention.

FIG. 2 is a perspective view showing in detail the structure of the sewing area of the cylindrical cross-section airbag of the present invention, FIG. 2 (A) showing sewing of body cloth pieces and FIG. 2 (B) showing the body. 3 shows sewing of a woven fabric piece and an end woven fabric piece.

FIG. 3 is a plan view showing an example of a woven fabric for a body woven fabric piece of a cylindrical sectional airbag of the present invention.

FIG. 4 is a plan view showing a body woven fabric piece obtained from the woven fabric shown in FIG. 3 together with an end woven fabric piece.

FIG. 5 is a perspective view showing an example of a conventionally known cylindrical sectional airbag.

6 is a cross-sectional view showing in detail the structure of a sewing area of the airbag shown in FIG. 5, FIG. 6 (A) showing sewing of a body woven fabric piece and an end woven fabric piece, and FIG. ) Indicates sewing of body cloth cloth comrades.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical cross-section air bag 2 ... Fuselage woven fabric piece 3, 4 ... Edge woven fabric piece 11, 11 ... Area having a reference cover factor 12, 12A, 12B ... Area having a cover factor larger than the reference

Claims (1)

[Claims] 1. An air bag having a substantially cylindrical cross section produced by subjecting a plurality of woven fabric pieces to a joining process including sewing, and a plurality of the bags used for the joining portion formed by including the sewing. A cylindrical cross-section air bag, characterized in that the cover factor of the sewing area of at least one piece of the woven fabric piece is larger than the cover factor outside the sewn area.