JP2004231132A - Airbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve productivity in a manufacturing process of an airbag, on which a plurality of patch cloths are layered, to obtain the stable adhesive strength of the patch cloths and reduce manufacturing costs. <P>SOLUTION: The airbag 1 has base cloths 2, 3 forming the outer shell of the air bag 1, and a plurality of layered patch cloths 5, 6, 7 attached to the base cloths 2, 3. Each patch cloth 5, 6, 7 is glued directly to the base cloths 2, 3 to form the airbag. The adhesion of the patch cloths to the base cloths are made indirectly by gluing a plurality of the patch cloths to each other, and none of the patch cloths are joined to the base cloths. As a result, stable adhesion strength between the base cloths and the patch cloths are easily achieved, so that dispersion in quality of the airbag 1 is suppressed. Since parts to be glued are not subjected indirectly to stamping or heating, there is no fear of dispersion in heat history or stamping, which enables the supply of the airbag 1 to the next process in a short time to compress the number of products accumulated in a process (intermediate stock), thus reduces manufacturing costs. Also, with adhesive parts formed in tiers, the airbag 1 has the strength that is improved against a high-temperature gas jetted upon actuating the airbag. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an airbag used for an airbag device that expands and deploys at the time of a vehicle collision or the like.
[0002]
[Prior art]
Conventional airbags have already been installed in a large number of commercial vehicles as a means for improving occupant collision safety.
An airbag which is filled with gas at the time of collision or the like to inflate and deploy is formed by laminating and sewn a base fabric obtained from a woven fabric such as nylon 66 or sack-woven with nylon yarn to form a bag.
However, the base cloth is cut out from the openings such as the gas generator and the exhaust hole, and the patch cloth is applied so that the strength at the time of expansion can be sufficiently secured even if the expansion gas is affected by the hot gas. Sutured. Alternatively, a technique is known in which the patch cloth is integrated by performing bonding instead of or in combination with the suturing means (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-5-139230 {(0010) in the column of the detailed description of the invention}
[0004]
[Problems to be solved by the invention]
Most of the above conventional airbags use a synthetic resin adhesive when joining the apron for reinforcement.
However, when a plurality of patch cloths (aprons) are laminated and bonded, an adhesive is applied to the base cloth, one patch cloth is superposed and heated, the next adhesive is applied, and the next patch cloth is applied. When heating is performed successively in the stacking process, the heating process becomes longer as the number of patch cloths increases, which causes a problem that productivity is low and manufacturing cost is high.
In addition, after the first patch cloth is laminated and bonded, the adhesive is heated and solidified, and then the new patch cloth and new adhesive are stacked one after another and heated, so the previously solidified adhesive repeatedly repeats the heat history. There is also the problem of going through.
However, it is extremely difficult to appropriately control the heating conditions of each layer even if the patch cloth and the adhesive are to be heated collectively in an alternately laminated state. Further, if the shape is to be adjusted by adding, it is extremely difficult to perform the compression uniformly. That is, in some layers, the adhesive flows in a wide range, and in other layers, the flow may decrease, and there is a problem that the thickness varies in each layer and it becomes difficult to control the adhesive strength.
In particular, in the case of a room temperature curing type (RTV) adhesive, if each layer is cured at room temperature, so-called in-process products (in-process stock) become enormous, and it is quite realistic in terms of securing space for curing. It will not be.
Further, in the current technical field of airbags, there is a need to use a plurality of patch cloths in a stacked manner for the purpose of reducing thermal damage in order to increase mechanical strength.
[0005]
The present invention solves the above-mentioned problems, and improves the productivity in the manufacturing process of an airbag in which a plurality of patch cloths are laminated, stably obtains adhesive strength, and reduces the manufacturing cost. The purpose is to provide.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and employs the following technical means. In the invention according to claim 1, the airbag includes a base cloth constituting an outer shell of the airbag, and a plurality of patch cloths joined to the base cloth and stacked on each other. The technical means of directly adhering to the base cloth was adopted.
[0007]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a front view showing an example of an airbag for a driver's seat, in which a heat-resistant patch 5 and reinforcing patches 6 and 7 are stacked on a lower base fabric panel (base cloth) 2.
At the center are a gas inlet 21, into which the upper half (not shown) of the inflator is inserted, an exhaust hole 22, and a mounting bolt hole 23. An outer peripheral stitch 31 and an inner peripheral stitch 32 (if the patch is bonded by the bonding method of the present invention, the function of the inner peripheral stitch 32 can be omitted without impairing the function), and a stitch 33 for reinforcing the exhaust hole is provided. Have been. Reference numeral 8 denotes an exhaust hole reinforcing patch. Reference numeral 3 denotes an upper base fabric panel, only a part of which is illustrated.
Although the yarn axes (the warp 41 and the weft 42) are arranged vertically and horizontally in FIG. 1, they may be in the bias direction (inclined by 45 degrees).
[0008]
FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. 1. The heat-resistant patch 5 and the reinforcing patches 6 and 7 are directly bonded to the lower base fabric panel 2 by adhesives 51, 61 and 71, respectively. .
In the figure, the patches are widely illustrated for the sake of explanation. However, in actuality, the height of the adhesives 51, 61, and 71 is almost the same because of the step-like shape of one cloth. Reference numerals 21 and 23 denote the gas inlet 21 and the mounting bolt holes 23 as described with reference to FIG.
[0009]
FIG. 3 is a front view showing the lower base fabric panel 2 in a state where the adhesives 51, 61, and 71 with the mounting bolt holes 23 omitted are applied. As can be understood from the drawing, the adhesives 51, 61, 71 are applied in a circular shape forming the shape of the airbag.
[0010]
FIG. 4 is a schematic view of a step of bonding the patch cloths 5 to 7, in which the silicone used is an RTV type coat and an adhesive is applied concentrically as shown in FIG. 5 to 7 are stacked from a small-diameter cloth (in the order of 7 → 6 → 5), pressed once by a press, and pressed in the state of (c).
[0011]
FIG. 5 is a conceptual diagram showing an example of a shape when an adhesive is applied to the patch cloths 5 to 7 as in FIG. 3. In this case, the patch cloths 5 to 7 are directly connected to the lower base cloth panel 2. And can be pressed and bonded by a single press.
[0012]
The base cloth panel and the patch cloth are not limited to a circular shape, and the number of the patch cloths is not limited to three. The present invention can be applied to various types. In particular, in the case of a low-denier base fabric (about 200 denier or less), the thickness of the base fabric is small and the number of sheets can be increased. Further, for example, the stitch 33 is effective not by sewing but by bonding, since the sewing thread is not damaged by the sewing needle.
[0013]
Next, features of the present invention will be described.
Further, the airbag of the present invention is an airbag to which a plurality of patch cloths joined to a base cloth constituting an outer shell are applied, wherein a plurality of patch cloths laminated to each other are directly bonded to the base cloth. It is. Since none of the patch cloths is bonded to the base cloth only by indirect bonding through bonding between a plurality of patch cloths, the adhesive strength can be obtained easily and stably, so that the quality variation of the airbag is suppressed, and at least The airbag can be supplied to the next process in a short period of time without indirect pressing or heating for the bonding of the parts, and there is no variation in the heat history and the operation of the press. It can be compressed and the manufacturing cost can be reduced.
In addition, in the bonding method used in the conventional airbag, since the adhesive is applied to the same part of the patch cloth, the force generated when the base cloth is pulled outward by the high-temperature gas generated when the airbag is activated is partially affected. However, in the bonding method according to the present invention, as can be understood from FIG. 2, since the gas injection is performed at a plurality of locations, the strength can be significantly increased compared to the conventional airbag.
[0014]
【The invention's effect】
According to the present invention, the following effects can be obtained as a result of employing the above configuration.
(1) Since none of the patch cloths is bonded to the base cloth only by indirect bonding through bonding between a plurality of patch cloths, the adhesive strength is easily and stably obtained, so that the quality variation of the airbag is suppressed. You.
(2) Since the main part is not pressed or heated indirectly, there is no variation in heat history or press action, the airbag can be supplied to the next process in a short time, and the product staying in the process ( (Intermediate inventory) can be compressed, and manufacturing costs can be reduced.
(3) Since the adhesive is formed in multiple stages, the strength against the high-temperature gas injected when the airbag is activated increases.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of a driver seat airbag according to the present invention.
FIG. 2 is a schematic view of a cross section taken along the line AA of FIG.
FIG. 3 is a front view showing the lower base fabric panel of the airbag for a driver's seat according to the present invention with an adhesive applied thereto.
FIG. 4 is a schematic diagram of a step of bonding a patch cloth of the driver airbag according to the present invention.
FIG. 5 is a conceptual diagram showing one example of a shape when an adhesive is applied to a patch cloth as in FIG. 3;
[Explanation of symbols]
1 ‥‥ Driver's seat airbag 2 ‥‥ Lower base fabric panel 3 ··· Upper base fabric panel 5 ··· Heat resistant patch 6 ··· Reinforcement patch 7 ··· Reinforcement patch 8 ···・ Exhaust hole reinforcement patch 21 ・ ・ ・ ・ ・ ・ Gas inlet 22 ・ ・ ・ ・ Exhaust hole 23 ・ ・ ・ ・ ・ ・ Mounting bolt hole 31 ・ ・ ・ ・ ・ ・ Outer peripheral stitch 32 ・ ・ ・ ・ ・ ・ Inner peripheral stitch 33 ・ ・ ・ ・ ・ ・ Exhaust Stitch 41 for hole reinforcement 41 warp 42 weft 51 direct adhesive 61 direct adhesive 71 direct adhesive

Claims (1)

An airbag having a base cloth constituting an outer shell of an airbag, and a plurality of patch cloths joined to the base cloth and stacked on each other, wherein each patch cloth is directly adhered to the base cloth. An airbag, characterized in that:

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