JPH0948303A - Air bag and folded body thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastomer air bag having a structure with superior resistance to an impulsive tensile stress during its inflation. SOLUTION: A front panel 12 and a rear panel 14 both made of an elastomer are joined together to compose an air bag 10. In the central portion of the rear panel 14, a reinforcement film 20 is adhered to the rearpanel 14 so that the film elongates over the whole length of the rear panel 14. On introducing the gas from an inflator to the folded body of the air bag 10, the film adhered portion probably affected with large local tensile stress will show superior resistance to the stress.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for protecting an occupant in a vehicle collision, and more particularly to an elastomer airbag.

[0002]

2. Description of the Related Art An airbag device is used to protect an occupant by deploying an airbag at the time of a vehicle collision.

[0003] Conventionally, airbags have generally been made of a woven fabric of fibers such as polyamide fibers coated with a silicone rubber.
An elastomer airbag (Japanese Patent Laid-Open No. 4-266544) has been proposed.

The driver's seat airbag is generally composed of a circular front panel and a circular rear panel, respectively. As is well known, the airbag is folded compactly and stored in the airbag device.

A first example of a conventional driver airbag and a folding method thereof will be described with reference to FIGS. 2A to 7A are plan views of the airbag,
(B) is a side view taken along the line BB of (A). FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.
FIG. 1 is a sectional perspective view of a folded airbag according to a conventional example,
FIG. 0 is a schematic vertical sectional view of an airbag device according to a conventional example.

The airbag 50 has a front panel 50a, which constitutes the front surface, and a rear panel 50b, which constitutes the rear surface, which are overlapped with each other and their peripheral portions are joined together to form a bag.

When no gas is blown into the airbag 50, the airbag 50 has a flat circular shape as shown in FIGS. 2 and 8, and has a rear panel 50b.
An opening 52 for receiving the tip side of the inflator is provided at the center of the. Also, this airbag 50
Is provided with a vent hole 54 for allowing the gas in the airbag to escape and absorb the impact when a human body hits the airbag 50 after the deployment.

When the airbag 50 is folded to be incorporated in the airbag apparatus, first, as shown in FIG. 3, the left half of the airbag 50 is cut along a first line 61 in the chord direction that does not pass through the center. The arc side is folded back to the front side, and then, as shown in FIG. 4, the tip (arc side) of the folded side is folded back to the front side along the second line 62. Further, the tip end side (arc side) of the folded back side is folded back to the back side along the third line 63.

Then, as shown in FIGS. 5 and 6, the right half arc side of the airbag 50 is folded back to the front side along a fourth line 64 symmetrical to the first line with the center of the airbag interposed therebetween.
Further, this folded back tip side (arc side) is folded back to the front side along a fifth line 65 symmetrical to the second line 62 with the center of the airbag interposed therebetween. Further, the tip end side (arc side) of this folded back portion is folded back to the back side along a sixth line 66 symmetrical to the third line 63 with the airbag center interposed therebetween.

In this way, the airbag 50 has a rectangular shape elongated in the directions of the first to sixth lines. As shown in FIG. 6B, the right side folded body folded along the lines 64, 65, 66 is arranged above the left side folded body folded along the lines 61, 62, 63.

Thereafter, as shown in FIG. 7, of the folded body of the elongated airbag 50, one side and the other side sandwiching the center of the airbag are respectively orthogonal to the first to sixth lines. 7,8,9,10 lines 67,6 extending to
The airbag 50 is folded in a zigzag shape along 8, 69 and 70 to form a folded body of the airbag 50 having a square shape as a whole. Note that FIG. 9 is a cross-sectional perspective view of the folded body 90 of the airbag 50.

A second method of folding the airbag 50 will be described with reference to FIG.

In a state where the front panel and the rear panel are flatly extended, the one of the airbags is taken along a first line 141 extending in a chord direction, which is deviated from the center of the airbag to one side of the airbag. The arc side of the side is folded back to the front side, and the arc side of this folded back portion is the first line 1
Second to fourth lines 142, 143, 14 parallel to 41
Fold back 3 times along the 4th direction.

Next, the arc side on the other side of the airbag is folded back to the front side along a fifth line 145 which is substantially symmetrical to the first line 141 with the center of the airbag sandwiched, and the arc side of this folded back portion. Are folded back three times along the sixth to eighth lines 146, 147, 148 parallel to the fifth line with the center in between. Thus, these first to eighth
Make a rectangular elongated body in the direction of the line, and after that,
Of the rectangular folds, one side and the other side sandwiching the center are respectively attached to the first to eighth lines 141.
To 148, and is folded back a plurality of times along a line 149 passing through a portion deviated from the center of the airbag to form a folded airbag 140 having a substantially square shape.

The portion folded back along the first to fourth lines 141 to 144 and the portion folded back along the fifth to eighth lines 145 to 148 are juxtaposed without overlapping.

FIG. 13 shows a third folding method of the airbag 50. This folding method is basically the same as that of FIG. 12 except that the position of the top of the panel (TOP, the side disposed above the steering wheel) is deviated by 90 ° in the counterclockwise direction. The same reference numerals indicate the same parts.

A fourth folding method of the airbag 50 will be described with reference to FIG.

In a state where the front panel and the rear panel are flatly extended, the one of the airbags is taken along a first line 161 extending in a chord direction, which is deviated from the center of the airbag to one side of the airbag. The arc side of the side is folded back to the front side, and further folded back to the front side along a second line 162 perpendicular to the first line deviated from the center of the airbag, and further, the first center is sandwiched with the airbag center interposed therebetween. Fold back to the front side along a third line 163 that is substantially symmetrical and parallel to the line.

Next, the arc side on the other side of the airbag is folded back to the front side along a fourth line 164 which is substantially symmetrical and parallel to the second line 162 with the center of the airbag interposed therebetween, and the folded portion The arc side of the portion protruding from the side is folded back to the front side along the fifth line 165 overlapping the first line 161, and the tip side of the portion folded back along the fourth line 164 is referred to as the first side. The airbag folded body 160 having a substantially square shape is formed by folding the airbag 160 back to the front side along the sixth line 166 overlapping the second line 162.

By covering the thus folded airbag 50 with the module cover 48, the airbag device shown in FIG. 10 is constructed. This airbag device has a structure in which an inflator 46 and an airbag 50 deployed by the inflator 46 are attached to a main plate surface 44a of a retainer 44, and the folded airbag 50 is covered with a module cover 48. When the inflator 46 is operated, the airbag 50 presses the module cover 48, and the module cover 48 is torn. Then, the airbag 50 is largely deployed in the vehicle compartment.

Regarding the conventional passenger seat airbag No. 11
This will be described with reference to the drawings.

This passenger-side airbag 81 has an opening 82 in its rear portion for receiving gas from an inflator (not shown). The airbag 1 is made of cloth, and a flap portion 83 is provided on the peripheral portion of the opening 82 by impregnating a synthetic resin or sewn a reinforcing cloth. The flap portion 83 is provided with a plurality of bolts or rivet insertion holes 84, and the airbag 1 can be connected to a container (not shown) of the airbag device by the bolts or rivets.

As shown in FIG. 11 (B), the airbag 81 is manufactured by sewing the peripheral edge of the side panel 87 to the side edge of the long center panel 86.

The side panel 87 is provided with a vent hole 85 in advance. When the occupant plunges into the deployed airbag 81, the gas inside the airbag flows out from the vent hole 85, and the impact given to the occupant is reduced.

[0025]

When the inflator is actuated and the airbag is deployed, the panel is formed at the moment when the folded portion, especially the folded portion is fully extended in the process of deploying the airbag. In particular, extremely large tensile stress is applied to the rear panel. That is, once the air bag that is rapidly inflated by the gas is fully expanded,
Since the panel cannot extend further outward, the gas ejection pressure and the deployment inertial force of the panel are applied to the panel at one time, and a significantly large tensile stress is applied to the panel and the rear panel by shock. become.

It is an object of the present invention to provide an elastomeric air bag and a folded body thereof that sufficiently withstand such an impact tensile stress.

By the way, the conventional passenger airbag shown in FIG. 11 is very troublesome because the work of sewing the side panel 87 to the center panel 86 cut into a prescribed size requires three-dimensional sewing.

That is, in order to sew the side panel 87 to the center panel 86, those edges are overlapped and sewn with a sewing machine, but to overlap both edges, the center panel 86 is attached to the side panel 87. Since it is necessary to bend along the edges of the panels, it is difficult to overlap the panels 86 and 87. Further, since the edges of both panels are sewn together while the center panel 86 is curved, the sewing operation is difficult and time-consuming.

Particularly, when one side panel 87 is sewn to the center panel 86 and then the other side panel 87 is sewn to the center panel 86, the sewn side panel becomes bulky and interferes with the sewing operation. It is difficult to perform sewing work.

An object of the present invention is to provide a passenger seat elastomer air bag which does not require sewing and can sufficiently withstand impact tensile stress, and a folded body thereof.

[0031]

An airbag according to claim 1 is provided with a front panel and a rear panel made of an elastomer film, and an airbag for an inflator is provided in the center of the rear panel. A reinforcing film is attached to a portion of the airbag where the maximum tensile stress is applied during the deployment process.

The airbag of claim 2 is the airbag of claim 1, wherein the airbag is expanded in a predetermined direction and then further expanded in a direction orthogonal to the predetermined direction. The reinforcing film is attached so as to extend in the predetermined direction.

An airbag according to a third aspect is the airbag according to the second aspect, wherein the front panel and the rear panel are circular.
The reinforcing film has a width of 50 to 300% of the diameter of the inflator opening of the rear panel and extends from one end to the other end of the rear panel.

An airbag according to a fourth aspect is the airbag according to the second aspect, wherein the front panel and the rear panel are circular.
The reinforcing film has a width of 50 to 300% of the diameter of the inflator opening of the rear panel and extends from the central portion of the rear panel to one end thereof.

The folded airbag according to claim 5 is an airbag folded body obtained by folding a driver airbag having a front panel and a rear panel, wherein the front panel and the rear panel are flatly extended, The arc side of the one side of the airbag is folded back to the front side along a first line extending in the chord direction, which is deviated from the center of the airbag to one side of the airbag, and the arc of the folded portion is further folded. Side is folded back to the front side along a second line parallel to the first line, and the arc side of this folded back portion is the back side along a third line parallel to the first and second lines. And then fold back the arc side on the other side of the airbag to the front side along a fourth line that is substantially symmetrical to the first line with the center of the airbag in between, and further fold the arc side of the folded portion, The second across the center Fold back to the front side along a fifth line that is substantially symmetrical to the line, and further turn the arc side of this folded portion to the back side along a sixth line that is substantially symmetrical to the third line with the center in between. Fold back and thus these 1st to 6th
Make a rectangular elongated body in the direction of the line, and after that,
Of the rectangular folded body, each of one side and the other side sandwiching the center extends in a direction orthogonal to the first to sixth lines and passes through a portion deviated from the center of the airbag. An airbag folded body, which is a substantially square-shaped airbag folded body by folding back a plurality of times along a line, and is a fourth to a third upper part above the portion folded back along the first to third lines.
In an airbag folded body in which portions folded back along the line 6 are overlapped, the airbag is the airbag according to claim 3.

The folded airbag according to claim 6 is an airbag folded body obtained by folding a driver airbag having a front panel and a rear panel, wherein the front panel and the rear panel are flatly extended. The arc side of the one side of the airbag is folded back to the front side along a first line extending in the chord direction, which is deviated from the center of the airbag to one side of the airbag, and the arc of the folded portion is further folded. The side is folded back three times along the second to fourth lines parallel to the first line to the front side, and then the air is drawn along the fifth line which is substantially symmetrical to the first line with the center of the airbag interposed therebetween. The arc side of the other side of the bag is folded back to the front side, and the arc side of the folded portion is further turned three times toward the front side along the sixth to eighth lines parallel to the fifth line across the center. Turn back and thus these first The rectangular folding body is elongated in the direction of the eighth line, and thereafter, on the one side and the other side of the rectangular folding body sandwiching the center, the first to the eighth sides are formed. An airbag fold body that is a substantially square airbag fold body that is folded back a plurality of times along a line that extends in a direction orthogonal to the line and that passes through a portion deviated from the center of the airbag. The airbag folded body in which the portion folded back along the line 1 to 4 and the portion folded back along the line 5 to 8 are juxtaposed without overlapping with each other, the airbag is the airbag according to claim 3. It is characterized by being a bag.

The folded airbag according to claim 7 is an airbag folded body obtained by folding a driver airbag having a front panel and a rear panel, wherein the front panel and the rear panel are flatly extended, The arc side of the one side of the airbag is folded back to the front side along a first line extending in the chord direction, which is deviated from the center of the airbag to one side of the airbag, and further from the center of the airbag. Fold back to the front side along a second line perpendicular to the deviated first line, and further turn back to the front side along a third line that is substantially symmetrical to the first line with the center of the airbag in between. The arc side of the other side of the airbag is folded back to the front side along a fourth line which is substantially symmetrical to the second line with the center of the airbag interposed therebetween.
Further, the arc side of the portion protruding from the side of the folded portion is folded back to the front side along the fifth line overlapping with the first line, and further, the tip side of the folded portion along the fourth line. The airbag is a airbag according to claim 4, wherein the airbag is a folded airbag having a substantially square shape by being folded back to the front side along a sixth line that overlaps the second line. It is characterized by that.

In the airbag of the present invention and the airbag folded body obtained by folding the airbag, a reinforcing film is attached to a portion to which the largest tensile stress is applied in the process of deployment, and the impact at the time of completion of deployment is impacted. Fully withstand the typical tensile stress. In addition, the volume (bulk) of the folded airbag can be smaller than that of a structure in which the entire front panel and rear panel are thickened and reinforced.

[0039]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a plan view of the airbag 10 according to the first embodiment, and FIG. 1 (B) is BB of the same (A).
It is sectional drawing which follows a line.

The airbag 10 is also an airbag for a driver's seat, which has a front panel 12 and a rear panel 14 each made of an elastomer film, and the peripheral portions of the front panel 12 and the rear panel 14 are joined by welding or adhesion. ing. An opening 16 for inserting an inflator is provided at the center of the rear panel, and a vent hole 18 is provided at a portion slightly apart from the center of the rear panel 14.

The folding method of the airbag 10 is the same as the folding method of the airbag 50 of FIGS. 2 to 7, and the structure of the folded body of the airbag 10 is the same as that of FIG. .

On the rear panel 14 of the airbag 10, the longitudinal direction of the airbag, that is, FIG. 3 (A), in the state where the folded portion is fully extended when the airbag is deployed.
An extremely large tensile stress is applied in the vertical direction 200 of the. Therefore, in this embodiment, the reinforcing film 20 having a width of 100 to 300% of the diameter of the inflator insertion opening 16 of the rear panel 14 and extending from the upper end to the lower end of the rear panel 14 is bonded or heat-melted to the rear panel 14. It is attached by wearing.

When gas is introduced from the inflator into the folded body of the airbag 10 to which the reinforcing film 20 is attached in this manner to deploy the airbag, a very large tensile stress is applied to the rear panel during the deployment process. However, the rear panel is sufficiently resistant to this tensile stress. Further, since the reinforcing film 20 is attached only to a part of the rear panel 14, the volume of the airbag folded body does not become so large.

In the case of the folding method shown in FIGS. 12 and 13,
In the unfolding process, an extremely large tensile stress is applied in the direction 300 in FIGS. 12 (2) and 13 (2), so that FIGS. 12 (1), (2) and 13 (1), ( As in 2), the same reinforcing film 2 as in FIG.
0 is attached to the rear panel.

In the case of the folding method shown in FIG. 14, in the process of unfolding, the arrow 4 in FIG.
Since an extremely large tensile stress is generated in the 00 direction, the reinforcing film 22 is attached from the central portion to the left end of FIGS. 14 (1) and 14 (2).

An embodiment of the passenger airbag will be described below. 15 and 16 are a perspective view and a sectional view of an airbag for a passenger seat according to an embodiment of the present invention, and FIG. 17 is a side view showing the inside of an automobile equipped with the airbag apparatus for a passenger seat.

As shown in FIG. 17, on the instrument panel 212 of the automobile 210, a passenger seat airbag device 214 is provided.
Is installed. This passenger airbag device 214
Is a case 216, an airbag 218 folded and stored in the case 216, and an inflator 220 that generates gas for deploying the airbag 218.
And a lid 222 that covers the case 216.
One side edge of the lid 222 is connected to the case 216 so as to allow the lid 222 to rotate toward the vehicle interior 224. At the other side of the lid 222, the inflator 220 is actuated and the airbag 21
8 is connected to the case 216 so that it can be pushed by the airbag 218 and separated from the case 216 when the airbag 8 is deployed.

Airbag 21 used in this embodiment
As shown in FIGS. 15 and 16, reference numeral 8 is a bag shape in which a lower lower panel 234 and an upper upper panel 236 each made of an elastomer film are joined by welding or adhesion. This airbag 218
Is the seat cushion 2 of the seat 226 of the automobile 210.
It is configured so as to be deployed toward the vicinity 232 of the intersection of the 28 and the seat back 230.

The lower panel 234 includes an inflator 2
An opening 238 for receiving gas from 20 and a vent hole 240 are provided. The flaps 242, 244, 246 provided on the peripheral portion of the opening 238.
248 is connected to the case 216.

Each of the panels 234 and 236 has a shape extending long in the front-rear direction of the automobile 210, and the opening 238 is provided at a position of the airbag 218 near the front of the automobile.

The flaps 242 to 248 are provided with openings (circular holes or slits) 250 for passing rivets or bolts.

An annular patch cloth 254 is adhered or welded around the vent hole 240.

In the passenger airbag 218, the panels 234 and 236 are provided at the central portions in the vehicle width direction.
Reinforcing film 270 from the front end to the rear end in the vehicle front-rear direction
Is affixed.

The width of the film 270 is preferably 50 to 200% of the width of the opening 238.

The panels 234 and 236 are superposed on the workbench, and the peripheral portions of the panels 234 and 236 are firmly joined by welding or adhesion.

The airbag device 21 thus configured
When a vehicle 210 equipped with No. 4 collides, the inflator 220 ejects gas and the airbag 218 is deployed. The lid 222 is opened toward the vehicle interior 224 by being pressed by the expanding airbag 218, and the airbag 218 is delivered into the vehicle interior 224 as shown in FIG. 7. Then, as shown in FIG. 17, the airbag 218 is deployed toward the vicinity of the intersection corner 232 of the seat cushion and the seat back. Finally, the airbag 218 hits the waist 260 of the occupant and restrains the waist 260 of the occupant.

In this way, the waist 260 is the airbag 218.
As a result of various experiments, it was confirmed that when restrained by, the occupant can be sufficiently protected as in the case where the airbag is largely deployed in front of the occupant's chest to the front of the upper body such as the head.
In addition, the effect of suppressing the lower half of the occupant not wearing the seat belt from moving forward in a collision can be expected.

Also in this airbag 218, an extremely large tensile stress is applied to the panels 234 and 236 during the process of deployment.
However, since the reinforcing film 270 is attached, the panels 234 and 236 sufficiently withstand this tensile stress. The reinforcing film 270 is used for the panel 23.
Since it is attached only to a part of 4, 236, the volume of the airbag folded body does not become so large.

The airbag 2 of this airbag device 214
The volume of the air bag 18 is smaller than that of a conventional air bag that is widely deployed in front of the upper body of the occupant. Therefore, the time required to complete the deployment of the airbag 218 is short.
Moreover, the output of the inflator 220 can be reduced.

In the above embodiment, the two panels 234, 2
The air bag 218 in which 36 is adhered or welded is used, but in the air bag of the present invention, one panel is folded back to form an upper panel and a lower panel, and the peripheral portions of these panels are welded or adhered. It may be configured.

A method of folding the passenger seat airbag 218 will be described with reference to FIGS. 18 (1) to (11).

First, as shown in FIG. 18 (1), the panel 23
Flatten 4,236, and fold the rear end side 272 of the vehicle inside the bag. Next, as shown in FIG. 18 (2), the panel 23
Fold the right side of 4,236 inside the bag, and
As shown in FIG. 18 (3), the left side portions of the panels 234 and 236 are folded inside the bag. As a result, the airbag 21
Since 8 has a substantially rectangular shape, it is valley-folded along the first folding lines 281 and 281 in the vehicle front-rear direction to form the elongated shape shown in FIG. 18 (5).

The left half of FIGS. 18 (1) to (4) and the upper half of FIG. 18 (5) are plan views of the airbag 218 and the case 216, and the right half is a cross section taken along the line BB of the left half. It is a figure. The lower half of FIG. 18 (5) is a side view of the airbag 218 and the case 216.

The vehicle rear end side of the air bag 218 folded in such a slender shape is shown in FIGS. 18 (6) to 18 (8).
After folding in a zigzag shape along the second folding line 282 in the vehicle width direction, it is housed in the case 216 as shown in (9) above, and the portions 234a, 234 of the panels 234, 236 that protruded.
36a is pushed into the case 216 as shown in (10).
Finally, the protector cloth 284 is covered as in (11).

Referring to FIG. 19, this airbag 218
Another folding method will be described. FIG. 19 (1)-
(6) is the same as FIG. 18 (1) to (6). Nineteenth
In FIG. 7A, the case 216 is turned upward, and the block 286 is folded back in a zigzag shape along the second folding line 282 from the vehicle rear side of the airbag 218. Thereafter, as in (8), (9), and (10), the case 21 is rotated while rotating the block 286 in the arrow direction.
Put it in 6 and finally cover it with protector cloth 284 as in (11).

During deployment of the airbag 216 folded as shown in FIGS. 18 and 19 (1) to (11), an extremely large tensile stress in the direction of the arrow 290 in FIG. , 236.
Therefore, in this embodiment, as described above, the reinforcing film 270 extending in the vehicle front-rear direction is attached so that it can sufficiently withstand a large tensile stress.

FIG. 20 is a perspective view of a passenger seat airbag 301 according to still another embodiment of the present invention and a plan view of a panel constituting the same.

The passenger seat airbag 301 is
The panel of the conventional airbag 1 shown in the figure is made of an elastomer. That is, this passenger airbag 3
01 is a center panel 302 and a side panel 30
3,304 three elastomer panels are adhered or welded. A reinforcing film 305 is superposed on the center panel 302 and adhered or welded thereto. In addition, 3
Reference numeral 06 is a vent hole, and 307 is an opening for receiving gas from the inflator.

Since the reinforcing film 305 is provided also in the passenger seat airbag 301, it is possible to sufficiently withstand a large tensile stress applied during the expansion process. Moreover, the volume of the folded airbag is not so large.

The passenger-side airbag 301 can also be folded by the same method as shown in FIGS.

In the present invention, the elastomer film forming the airbag panel is preferably made of thermoplastic polyurethane elastomer. The elastomer film made of this material has a soft feel and has sufficient strength.

The material of the reinforcing film may be the same as or different from that of the rear panel.

In FIG. 17, the air bag device is installed on the instrument panel 212.
It may be installed in the seat back 230 and applied to the purpose of protecting the occupant of the rear seat.

[0074]

As described above, the airbag and the folded airbag according to the present invention sufficiently withstand the shocking tensile stress generated during the deployment process. Since the reinforcing film is partially provided in this airbag, it is not necessary to make the entire panel of the airbag thick. Therefore, the weight of the airbag and the bulk of the folded airbag are not increased.

The passenger airbag according to the present invention is simple to manufacture, and the manufacturing cost of the passenger airbag device or the rear airbag device can be significantly reduced.

[Brief description of drawings]

FIG. 1A is a plan view of an airbag according to an embodiment, and FIG. 1B is a sectional view taken along line BB in FIG.

2A is a plan view illustrating a first folding method of an airbag, and FIG. 2B is a side view taken along line BB in FIG.

3A is a plan view illustrating a first folding method of an airbag, and FIG. 3B is a side view taken along line BB in FIG. 3A.

FIG. 4A is a plan view illustrating a first folding method of an airbag, and FIG. 4B is a side view taken along the line BB in FIG. 4A.

5A is a plan view for explaining the first folding method of the airbag, and FIG. 5B is a side view taken along line BB in FIG. 5A.

FIG. 6A is a plan view for explaining the first folding method of the airbag, and FIG. 6B is a side view taken along the line BB in FIG. 6A.

7A is a plan view for explaining the first folding method of the airbag, and FIG. 7B is a side view taken along line BB in FIG. 7A.

8 is a sectional view taken along the line VIII-VIII of FIG.

FIG. 9 is a sectional perspective view of a folded body of an airbag according to a conventional example.

FIG. 10 is a sectional view of an airbag device according to a conventional example.

FIG. 11A is a perspective view showing an airbag for a passenger seat according to a conventional example, and FIG. 11B is a development view of a panel thereof.

FIG. 12 is a plan view showing a second folding method of the airbag.

FIG. 13 is a plan view showing a third folding method of the airbag.

FIG. 14 is a plan view showing a fourth folding method of the airbag.

FIG. 15 is a perspective view of a passenger seat airbag according to an embodiment.

FIG. 16 is a cross-sectional view of a passenger seat airbag according to an embodiment.

FIG. 17 is an explanatory diagram of a folding method of the passenger airbag according to the embodiment.

FIG. 18 is an explanatory diagram of another folding method for the passenger airbag according to the embodiment.

FIG. 19 is an explanatory view of still another folding method of the passenger seat airbag according to the embodiment.

FIG. 20 is a perspective view and a panel plan view of a passenger seat airbag according to still another embodiment.

[Explanation of symbols]

 10,50 Air bag 12,50a Front panel 14,50b Rear panel 18,52 Vent hole 20,22 Reinforcing film 216 Passenger airbag 234,236 Panel 270 Reinforcing film

Claims (8)

[Claims] 1. An airbag for a driver's seat, which comprises a front panel and a rear panel made of an elastomer film, and an opening for an inflator is provided in the center of the rear panel, wherein the maximum tensile stress in the deployment process of the airbag is the rear panel. An airbag characterized in that a reinforcing film is attached to a portion to be added. 2. The airbag according to claim 1, wherein the airbag is first expanded in a predetermined direction and then further expanded in a direction orthogonal to the predetermined direction, and the reinforcing film is the predetermined film. An airbag characterized by being attached so as to extend in the direction of. 3. The front panel and the rear panel according to claim 2, wherein the front panel and the rear panel are circular, and the reinforcing film is 50 to 300% of a diameter of an opening for an inflator of the rear panel.
An airbag having a width of, and extending from one end to the other end of the rear panel. 4. The front panel and the rear panel according to claim 2, wherein the front panel and the rear panel are circular, and the reinforcing film is 50 to 300% of a diameter of an opening for an inflator of the rear panel.
An airbag having a width of, and extending from a central portion of the rear panel to one end portion. 5. An airbag folded body obtained by folding a driver airbag having a front panel and a rear panel, the airbag being from the center of the airbag in a state where the front panel and the rear panel are flatly extended. The arc side of the one side of the airbag is folded back to the front side along a first line extending in the chord direction, which is deviated to one side, and the arc side of this folded back portion is parallel to the first line. Is folded back to the front side along the second line, and the arc side of the folded back portion is folded back to the back side along the third line parallel to the first and second lines, and then the center of the airbag is sandwiched. Then, the arc side on the other side of the airbag is folded back to the front side along a fourth line which is substantially symmetrical to the first line, and the arc side of this folded back portion is sandwiched between the second side and the second side. Along the 5th line, which is almost symmetrical to the line Folding the front Te, further, the arc side of the folded portion, across the said center folded to the back side along a substantially symmetrical sixth line of the line of the third, thus these first to sixth
The rectangular folded body is elongated in the direction of the line, and thereafter, one side and the other side sandwiching the center of the rectangular folded body are respectively separated by the first to sixth sections.
An airbag folded body that is a substantially square airbag folded body by folding back a plurality of times along a line that extends in a direction orthogonal to the line and passes through a portion deviated from the center of the airbag, On the upper side of the part folded back along the first to third lines, the fourth
An airbag folded body in which portions folded back along the line (1) to (6) are overlapped, wherein the airbag is the airbag according to claim 3. 6. An airbag folded body obtained by folding a driver airbag having a front panel and a rear panel, the airbag being from the center of the airbag in a state where the front panel and the rear panel are flatly extended. The arc side of the one side of the airbag is folded back to the front side along a first line extending in the chord direction, which is deviated to one side, and the arc side of this folded back portion is parallel to the first line. 3 turns back to the front side along the second to fourth lines, and then the arc side on the other side of the airbag along the fifth line which is substantially symmetrical to the first line with the center of the airbag in between. It is turned back to the front side, and further, the arc side of this turned back portion is turned back three times along the sixth to eighth lines parallel to the fifth line with the center in between, and thus the first to the eighth. Long and narrow in the direction of the line And Jo of the folded, thereafter, of the folded of the long rectangular shape, each of the middle one across the heart and the other side, these first to eighth
An airbag folded body that is a substantially square airbag folded body by folding back a plurality of times along a line that extends in a direction orthogonal to the line and passes through a portion deviated from the center of the airbag, An airbag folded body in which a portion folded back along the first to fourth lines and a portion folded back along the fifth to eighth lines are juxtaposed without being overlapped with each other, wherein the airbag is according to claim 3. An airbag folded body characterized by being an airbag. 7. An airbag folded body obtained by folding a driver airbag having a front panel and a rear panel, the airbag being from the center of the airbag in a state where the front panel and the rear panel are flatly extended. The arc side of the one side of the airbag is folded back to the front side along a first line extending in the chord direction that is deviated to one side and is perpendicular to the first line deviated from the center of the airbag. Fold back to the front side along the second line, and further fold back to the front side along a third line that is substantially symmetrical to the first line with the center of the airbag in between, and then return to the second side with the center of the airbag in between. The other side of the arc of the airbag is folded back to the front side along a fourth line that is substantially symmetrical to the line of, and the side of the folded back part overlaps with the first line. Along the fifth line And a front end side of a portion folded back along the fourth line is folded back toward the front side along a sixth line overlapping with the second line, thereby forming a substantially square airbag folded body. A folded airbag, wherein the airbag is the airbag according to claim 4. 8. An airbag for a passenger seat or a rear seat airbag device, wherein two panels made of an elastomer film are overlapped and their peripheral portions are joined together, and one panel is provided with an inflator. An airbag having an inflator opening for receiving gas, wherein a reinforcing film is attached to a portion of one of the panels to which maximum tensile stress is applied when deployment of the airbag is completed.