JPH07117599A - Bag body of air bag device - Google Patents

Abstract

PURPOSE:To facilitate cutting and seaming by furnishing a first foundation each side part of which is continued to both sides of a central part and a second foundation both ends of which are sewn on a head part and a bottom part of the central part, both side parts of which are sewn on the periphery of the both side parts of the first foundation and forming a pressure gas filled space between itself and the first foundation in a bad body. CONSTITUTION:A side B of a central part 36X of a first foundation 36 and a side I of a driver contact part 38X of a second foundation are sewn on each other. Thereafter, a side E of a side part 36Y of the first foundation 36, a side K of the driver contact part 38X of the second foundation 38, a side F of the side part 36Y of the first foundation 36 and a side N of a continued part 38Y of the second foundation 38 are respectively sewn on each other. Additionally, a side G of a side part 36Z of the first foundation 36 and a side L of the driver contact part 38X of the second foundation 38 and a side H of the side part 36Z of the first foundation 36 and a side O of the continued part 38Y are sewn on each other. Finally, a side A of the central part of the first foundation 36 and a side M of the continued part 38Y of the second foundation are sewn on each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag body of an airbag device which expands and deploys by pressure gas generated during sudden deceleration of a vehicle to protect an occupant, and is particularly suitable for an occupant seated on a seat other than a driver's seat. To a bag body of a passenger airbag device.

[0002]

2. Description of the Related Art A vehicle is equipped with an airbag device for protecting an occupant when the vehicle is suddenly decelerated.

Among such airbag devices, for example, a passenger airbag device 2 for a passenger seat as shown in FIG. 6 is attached to an instrument panel or another vehicle body fixing portion, and is used when the vehicle suddenly decelerates. Gas generated from the inflator 4 flows into the bag body 6 by the operation of the acceleration sensor, and the bag body 6 is instantly inflated and deployed. This allows
The bag body 6 receives the occupant M moving forward due to inertia and protects the occupant M from a collision with the vehicle body.

By the way, since a large space is formed between the instrument panel and the front window shield glass and the passenger seat, in order to effectively protect the occupant by making the shape of such a large space fit as much as possible. In addition, as shown in FIG. 7, the bag body 6 of the conventional passenger airbag device has three base cloths 6A, 6B,
It is formed from 6C.

However, if the number of base fabrics is large as described above,
The cutting and sewing of the base cloth becomes complicated, and a great amount of time is required to manufacture the bag body 6. For this reason, the bag body of the conventional passenger airbag device has a problem that the productivity is poor and the manufacturing cost is high.

[0006]

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to provide a bag body of an airbag device which can be easily cut and sewn.

[0007]

SUMMARY OF THE INVENTION According to the present invention, in a bag body of an airbag device for inflating and deploying by a pressure gas to protect an occupant, a first base cloth having continuous side portions on both sides of a central portion, and both ends. Portions are sewn to the top and bottom of the central portion, and both sides are sewn around the sides of the first base cloth to form a first portion.
A second base cloth that forms a pressure-gas filled space with the base cloth;
It is characterized by having.

[0008]

According to the bag body of the airbag device of the present invention having such a structure, since the number of base cloths constituting the bag body is small,
Since the cutting and sewing operations do not require much labor, the time required for manufacturing the bag body of the airbag device can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case in which a bag body of an airbag apparatus according to an embodiment of the present invention is used in a passenger airbag apparatus will be described below with reference to FIGS. In the figure, an arrow FR indicates a front direction of the vehicle body, and an arrow UP indicates an upward direction of the vehicle body.

As shown in FIG. 4, in the vehicle body 10, an instrument panel 16 made of a polypropylene resin material is arranged in front of the passenger seat 14 in the vehicle interior 12. On the back side of the instrument panel 16, a passenger airbag device 18 is mounted. The passenger airbag device 18 has a longitudinal shape in the vehicle width direction.
The portion of 6 which faces the passenger airbag system 18 is a short airbag cover 20 which is elongated in the vehicle width direction.

As shown in FIG. 3, the cross-sectional shape of the case 22 of the passenger airbag device 18 as viewed from the vehicle width direction is substantially U-shaped, and the case 22 is opened obliquely upward and rearward of the vehicle body. The part 24 is formed. An opening edge portion 27 of the bag body 26 (a peripheral portion of an opening 40 in the bag body 26 described later) is fixed to the inner peripheral portion of the opening portion 24 with a bolt 28 and a nut 30. Further, between the opening edge portion 27 of the bag body 26 and the bolt 28, a retainer 32 having a long shape is arranged along the opening portion 24 of the case 22, and the opening portion 24 of the case 22 and the bag. Opening edge 2 of body 26
The connection with 7 is sealed.

A cylindrical inflator 34 is fixed in the case 22 in the vicinity of the bottom portion 22A along the vehicle width direction. The inflator 34 is filled with a gas generating substance, and the gas generating substance is provided with an ignition means. Therefore, when the vehicle body 10 rapidly decelerates by a predetermined value or more, the gas generating substance is ignited through the igniting means by the operation of the acceleration sensor (not shown) to start the combustion, and the gas generated by the combustion causes the case The bag body 26 accommodated in the folded state near the opening 24 of the bag 22 swells, breaks the airbag cover 20 of the instrument panel 16, and expands into the vehicle compartment.

The structure of the bag 26 will be described below. As shown in FIGS. 1 and 2, the bag body 26 is made of a cloth material having excellent heat resistance and sealability.
The base fabric 36 and the second base fabric 38 are composed of a total of two base fabrics.

The first base cloth 36 (see FIG. 1A) is composed of a central portion 36X and a pair of side portions 36Y and 36Z. The central portion 36X has four sides A, B, C, and D.
It is a trapezoid consisting of sides, the sides A and B are parallel to each other, and the lengths of the sides C and D are equal. Side 36
Y and 36Z are triangles each having three sides C, E, F or D, G, H, and side 36Y is continuous with C at side C and side 36Z is The side D is continuous with the central portion 36X. The side E of the side portion 36Y and the side G of the side portion 36Z have the same length, and the side F of the side portion 36Y and the side H of the side portion 36Z have the same length. An opening 40 for attaching the inflator 34 is formed near the side A of the central portion 36X.

The second base cloth 38 (see FIG. 1B) is composed of an occupant contact portion 38X and a continuous portion 38Y. The occupant abutting portion 38X is a rectangle having four sides, a side I, a side J, a side K, and a side L, and the lengths of the side I and the side J and the lengths of the side K and the side L are equal to each other. ing. In addition, the continuous portion 38
Y is a trapezoid that is continuous at the side J with the occupant contact portion 38X and is composed of four sides: side J, side M, side N, and side O. The side J is parallel to the side M and the length of the side N is The sides O have the same length. The side B of the first base cloth 36 and the side I of the second base cloth 38
The length of the side A of the first base cloth 36 and the side M of the second base cloth are the sides E and G of the first base cloth and the side K of the second base cloth.
And the length of the side L, and the lengths of the sides F and H of the first base cloth and the sides N and O of the second base cloth are equal to each other.

Next, the production of the bag 26 will be described.
In order to manufacture the bag body 26 as shown in FIG. 2, first,
The side B of the central portion 36X of the first base cloth 36 and the side I of the occupant contact portion 38X of the second base cloth are sewn together. Then the first
The side E of the side portion 36Y of the base cloth 36 and the side K of the occupant contact portion 38X of the second base cloth 38, and the side F of the side portion 36Y of the first base cloth 36 and the second base cloth 38 are continuous. The sides N of the portion 38Y are sewn together. Further, the side portion 36Z of the first base cloth 36
Side G, the side L of the occupant contact portion 38X of the second base cloth 38, the side H of the side portion 36Z of the first base cloth 36, and the side O of the continuous portion 38Y of the second base cloth 38, respectively. Sew each other. Finally, the side A of the central portion 36X of the first base cloth 36 and the side M of the continuous portion 38Y of the second base cloth are sewn together. The bag body 26 sewn in this way is turned upside down through the opening 40,
It is connected to the opening 24 of the case 22.

As is clear from the above description, in this embodiment, the number of cutting and sewing operations can be reduced because the base cloth is composed of two sheets. In this sewing,
As is clear from FIG. 2, since there are many straight stitches, the time required for sewing can be greatly reduced.

Further, the opening 40 in the bag body 26 after being sewn
Since the space in the vicinity of is narrow, the pressure gas immediately diffuses toward the occupant side when inflating, so that the occupant contact portion 3 of the bag body 26 is
The 8X can expand instantly.

In the present embodiment, the structure of the bag body 26 is a pentahedron, but it is not limited to this and may be a tetrahedron or a hexahedron.

Further, in the above embodiment, the case where the bag body 26 is used in the passenger airbag apparatus which is elongated in the vehicle width direction is taken as an example. The bag body 26 according to this embodiment is shown in FIG. It may be used for a substantially rectangular parallelepiped airbag device that can be used for both a driver and a passenger.

[0021]

As described above, since the present invention is composed of two base cloths, it has an excellent effect of facilitating cutting and sewing.

[Brief description of drawings]

FIG. 1A is a schematic view showing a first base cloth of a bag body of an airbag device according to the present embodiment, and FIG. 1B is a second base cloth of the airbag device according to the present embodiment. It is a schematic diagram showing the base fabric of.

FIG. 2 is a schematic perspective view showing a bag body of the airbag device according to the present embodiment.

FIG. 3 is a cross-sectional view of a bag body of an airbag device housed in an airbag cover as seen from a side of a vehicle body.

FIG. 4 is a perspective view of an instrument panel to which the bag body of the airbag apparatus according to the present embodiment is applied, as seen from the rear of the vehicle body.

5A and 5B are views showing an example of a mounting state of the bag body of the airbag apparatus according to the present embodiment, FIG. 5A is a sectional view of the bag body housed in the plate bag holder, and FIG. (A)
3 is a perspective view of the plate bag holder of FIG.

FIG. 6 is an operation view of a state where the bag body of the passenger airbag device attached to the instrument panel is inflated and deployed, as viewed from the side of the vehicle body.

FIG. 7 is a schematic perspective view showing a conventional airbag device bag body for a passenger.

[Explanation of symbols]

 18 Passenger Airbag Device 26 Bag Body 36 First Base Fabric 36X Central Part 36Y Side Part 36Z Side Part 38 Second Base Fabric 38X Occupant Contact Part 38Y Continuous Part

Claims (1)

[Claims] 1. A bag body of an airbag device which is inflated and expanded by pressure gas to protect an occupant, wherein a first base cloth having side portions continuous to both sides of a central portion, and both end portions having a top portion of the central portion and A second base cloth that is sewn to the bottom and both sides are sewn around both sides of the first base cloth to form a pressure gas filled space between the first base cloth and the second base cloth; A bag body for an airbag device.