JPH08301036A - Air bag for vehicle and its manufacture - Google Patents

Abstract

PURPOSE: To reduce the package volume of an air bag by making the air bag for a driver's seat or the like without reversing it to the obverse and the reverse, and eliminating a folding-back part by this reversal. CONSTITUTION: In an air bag sewn together by superposing outer peripheral parts 4 and 5 of inflator side cloth 2 and occupant side cloth 3 on each other, the inflator side cloth 2 and the occupant side cloth 3 are composed of a thermally meltable cloth material of not being coated with a kind of rubber and resin, and outer peripheral edge parts 2a and 3a of these respective cloths 2 and 3 are fused together, and are sewn together by lock stitch sewing 7 without folding back the outer peripheral parts 4 and 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag for a vehicle, which is made of a non-coated cloth material not coated with rubber or the like, and more specifically, an air bag for which the package volume is reduced and the manufacturing process is simplified and the manufacturing thereof. It is about the method.

[0002]

2. Description of the Related Art An air bag device is a device for restraining an occupant by expanding an air bag at the time of a collision, and usually has an inflator which is a gas generator and an air bag body which is inflated by gas of the inflator. There is.

By the way, as an airbag of the above-mentioned airbag device, particularly for a driver's seat using a non-coated cloth, as shown in FIG. 7, a circular inflator side cloth having an inflator mounting hole 12 at its substantially center is formed. 13 and the occupant-side cloth 14 having the same shape as the inflator-side cloth 13 are superposed, and the outer peripheral portions of the cloths 13 and 14 are sewn together by a chain stitch 15, and then the airbag is attached to the front and back through the mounting holes 12. By inversion, an airbag as shown in the figure is formed.

[0004]

However, in the above-mentioned conventional non-coated airbag, since the outer peripheral portion of the airbag is folded back by the inversion, and the sewing applied to this portion is a chain stitch,
There is a problem in that the outer peripheral portion of the airbag becomes bulky, which increases the package volume of the airbag when folded and stored.

An object of the present invention is to cope with the above situation and to reduce the package volume of the airbag and to reduce the number of man-hours for manufacturing the airbag by omitting the reversal of the airbag. It is a thing.

[0006]

That is, the feature of the airbag of the present invention which meets the above-mentioned object is that an inflator side cloth having an inflator mounting hole and an occupant side cloth having the same shape as the inflator side cloth are polymerized. In the vehicle airbag in which the outer peripheral portion of each of these cloths is sewn, the inflator side cloth and the passenger side cloth are made of a heat-meltable cloth material not coated with rubber or resin, The outer peripheral edge portion is fused and the outer peripheral portion is sewn with a lock stitch without being folded back.

The method of manufacturing an airbag according to the present invention is
A method for manufacturing the airbag of the present invention, wherein an inflator mounting hole and a vent hole are formed in advance, and a reinforcing cloth is polymerized and adhered to the periphery of each hole, and an occupant-side cloth original cloth. And, a polymerization step in which the cutting lines of the inflator side cloth and the occupant side cloth are aligned, and a reinforcing cloth is sandwiched inside, and the above cutting line of each of the superimposed original fabrics is simultaneously cut by melt cutting. A cutting step of fusing the outer peripheral edge portions of the inflator side cloth and the occupant side cloth, and a sewing step of stitching the outer peripheral parts of the inflator side cloth and the occupant side cloth with lock stitches inside the cutting line. It is characterized by having.

Then, in the above-mentioned manufacturing method of the present invention,
Either the cutting process or the sewing process can be performed first, or the respective processes can be performed substantially at the same time.

[0009]

Since the airbag of the present invention eliminates the conventional bulky sewing of the outer peripheral portion, it is not necessary to invert the airbag in particular, whereby the conventional airbag outer peripheral portion can be prevented from being folded back. It is possible to reduce the package volume.

Since there is no need for the above inversion,
The reversing step can be omitted in the manufacturing process, and thus the manufacturing cost of the airbag can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an air bag for a driver's seat according to an embodiment of the present invention, and FIG. 2 is a perspective view of the same. The air bag of this embodiment has a mounting hole 1 for an inflator (not shown).
A circular inflator-side cloth 2 having the above-mentioned shape and an occupant-side cloth 3 having the same shape as the inflator-side cloth 2 are polymerized, and the outer peripheral portions 4 and 5 of these cloths 2 and 3 are sewn together. There is. A reinforcing cloth 6 is sewn to the inflator side cloth 2 around the mounting hole 1 as shown in FIG.

In the embodiment of the present invention, the inflator side cloth 2 and the occupant side cloth 3 are made of a heat-melting woven cloth such as nylon (PA66, PA46) or polyester which is not coated with rubber or synthetic resin. The outer peripheral edge 2a of the inflator-side cloth 2 and the outer peripheral edge 3a of the passenger-side cloth 3 are heat-sealed as shown in the drawing, and the sewing 7 of the outer peripheral portions 4 and 5 is connected to the outer peripheral portion 4. , Without folding back 5,
It is given by one or two laps of rock stitch.

As shown in FIG. 3, the airbag manufacturing method according to the embodiment of the present invention is such that the mounting hole 1 and the vent hole (not shown) of the inflator are formed in advance, and the reinforcing cloth 6 is polymerized around the holes. A superimposing step in which the sewn inflator-side cloth material 8 and the occupant-side cloth material 9 are overlapped so that the cutting lines of the inflator-side cloth and the occupant-side cloth are aligned and the reinforcing cloth 6 is sandwiched inside; As shown in FIG. 4, the cutting lines L of the superposed respective webs 8 and 9 are cut at the same time by melt cutting to fuse the outer peripheral edge portions 2a and 3a of the inflator side cloth 2 and the passenger side cloth 3 to each other. The cutting process is performed, and the sewing process is performed by sewing the outer peripheral portions 4 and 5 of the inflator side cloth 2 and the occupant side cloth 3 inside the cutting line L by the lock stitch sewing 7, as shown in FIG. .

In the manufacturing method of the embodiment of the present invention,
Either the cutting process or the sewing process may be performed first, and as shown in FIG. 6, the ultrasonic cutter 11 and the like are provided in parallel on the outer periphery sewing device 10 and are performed substantially simultaneously while rotating the raw fabrics 8 and 9. It is also possible.

In addition to the above-mentioned ultrasonic waves, examples of the melting and cutting means include high-frequency cutting, press cutting of a hot blade by a heater or electromagnetic induction, and the like.

In the airbag according to the embodiment of the present invention, however, since the bulkiness of the outer peripheral sewing portion 7 is smaller than that of the conventional one, it is not necessary to invert the airbag as described above, which is shown in FIG. It is possible to reduce the package volume of the airbag by eliminating the conventional folding back 16 on the outer peripheral portion of the airbag.

Further, since there is no need for the above-mentioned reversal, the reversal step can be omitted in the manufacturing process, whereby the manufacturing cost of the airbag can be reduced.

[0019]

As described above, the vehicle airbag of the present invention is an airbag in which an inflator-side cloth and an occupant-side cloth are superposed, and the outer peripheral portions of these cloths are sewn together. The side cloth and the side cloth are made of a heat-melting cloth material that is not coated with rubber or resin, and the outer peripheral edges of these cloths are fused together, and the outer circumference is not folded back and is sewn with lock stitches. Since the bulk of the sewing of the outer peripheral portion becomes low, it is not necessary to invert the airbag in particular, thereby eliminating the folding back of the conventional outer peripheral portion of the airbag and reducing the package volume of the airbag. In addition, since the above-mentioned reversal is not necessary, the reversal step can be omitted in the manufacturing process, and thus the manufacturing cost of the airbag In which a marked effect of reducing.

The method of manufacturing an airbag according to the present invention makes it possible to manufacture such an airbag easily and at low cost by reducing the number of steps.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a driver airbag according to an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a cross-sectional view showing a polymerization step of the manufacturing method of the example of the present invention.

FIG. 4 is a cross-sectional view showing a cutting step of the manufacturing method according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a sewing process of the manufacturing method according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a cutting / sewing process of a manufacturing method according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view of a conventional driver airbag.

[Explanation of symbols]

 1 inflator mounting hole 2 inflator side cloth 2a outer peripheral edge of inflator side cloth 3 passenger side cloth 3a outer peripheral edge of passenger side cloth 4 outer peripheral part of inflator side cloth 5 outer peripheral part of passenger side cloth 6 reinforcing cloth 7 outer circumference Sewn parts 8 Inflator side cloth roll 9 Passenger side cloth roll 10 Perimeter sewing device 11 Ultrasonic cutter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiro Sugiura No.3 Ikugayama, Uchikoshi, Miyoshi-cho, Nishikamo-gun, Aichi Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center

Claims (5)

[Claims] 1. A vehicle airbag in which an inflator side cloth having an inflator mounting hole and an occupant side cloth having the same shape as the inflator side cloth are superposed, and the outer peripheral portions of these cloths are sewn together. And the occupant side cloth are made of a heat-meltable cloth material not coated with rubber or resin, and the outer peripheral edges of these cloths are fused together, and the outer peripheral part is not folded back and locked. A vehicle airbag characterized by being sewn with stitches. 2. The method of manufacturing an airbag according to claim 1, wherein an inflator mounting hole and a vent hole are formed in advance, and a reinforcing cloth is superposed on and around each of the holes, and an inflator-side cloth original fabric is provided. , The occupant-side cloth and the inflator-side cloth and the occupant-side cloth are cut together, and the reinforcing cloth is sandwiched between them in a polymerization step, and the above-mentioned cutting lines of the overlapped cloths are melted. Cutting at the same time by cutting, a cutting step of fusing the outer peripheral edge portions of the inflator side cloth and the passenger side cloth, and a lock stitch between the outer peripheral parts of the inflator side cloth and the passenger side cloth inside the cutting line. A method for manufacturing an airbag for a vehicle, comprising a sewing step of stitching. 3. The method for manufacturing a vehicle airbag according to claim 2, wherein the sewing step is performed after the cutting step. 4. The method for manufacturing a vehicle airbag according to claim 2, wherein the cutting step is performed after the sewing step. 5. The method of manufacturing an airbag for a vehicle according to claim 2, wherein the cutting step and the sewing step are performed substantially at the same time.