JP6075778B2 - Airbag - Google Patents

Description

  The present invention relates to an airbag used in an airbag device for protecting an occupant in a vehicle.

  A vehicle such as an automobile is equipped with an airbag device that protects an occupant during a collision. The airbag device includes an inflator that generates high-pressure gas, an airbag that is inflated by the high-pressure gas of the inflator, and a case that accommodates these. An airbag used in an airbag device is stored in a folded manner in a case, and it is desired that the airbag can be inflated and deployed reliably and quickly.

Examples of such airbags include those disclosed in Patent Document 1 and Patent Document 2.
The airbag for a passenger seat shown in Patent Document 1 folds the front and rear sides of a belt-like airbag extending in the front-rear direction after folding a portion disposed in the left-right direction in the vehicle-mounted state before inflation. It is out. And the deployment speed of an airbag is aimed at by arranging the part of the front side in the airbag under the part of the back side.

  Further, the airbag disclosed in Patent Document 2 is intended to improve the deployment speed by being folded in a predetermined direction and then folded in an orthogonal direction so as to overlap with a plurality of vent holes.

JP 2001-130356 A Japanese Patent Laid-Open No. 10-157540

However, the airbags disclosed in Patent Document 1 and Patent Document 2 have the following problems.
In the airbags disclosed in Patent Document 1 and Patent Document 2, the overlapping portions of the folded airbags may generate resistance that hinders deployment at the early stage of deployment of the airbag. There is a demand for an airbag that can perform the above.

  The present invention has been made in view of this background, and an object of the present invention is to provide an airbag that can be inflated and deployed quickly and reliably.

One aspect of the present invention, the second fabric for forming a first fabric portion having a inlet for introducing high pressure gas, the bag-shaped with first dough part I Tsurana to the first fabric portion parts and is an air bag double sheet Tsu if overlap in a plane constructed folding Marete,
In the state where the double sheet is folded,
The portion of the double sheet that includes the inlet is the central portion, the portion of the double sheet that is located on one side of the central portion is the large piece portion, and the double sheet is on the other side of the central portion. A portion that is a portion and is shorter than the large piece portion from the center of the introduction port in the central portion is a small piece portion,
With the central portion as a reference, the direction in which the first fabric portion and the second fabric portion overlap in the central portion is a normal direction, orthogonal to the normal direction and the large piece portion and the The direction in which the small piece part is connected is the front-rear direction, and the normal direction and the direction orthogonal to the front-rear direction are the width direction,
Further, the side where the second fabric portion of the central portion overlaps the first fabric portion of the central portion is the front side in the normal direction, and the side where the large piece portion is connected to the central portion is the front-rear direction. When the side where the small piece part is connected to the front side, the center part is the rear side in the front-rear direction,
The large piece portion is formed as a laminated roll portion that is bent and wound a plurality of times along a plurality of bending lines parallel to the width direction, and the laminated roll portion is arranged on the front side in the normal direction with respect to the central portion . Is placed ,
The nubs are along the laminating roll portion is disposed on the front side of the normal direction of the laminating roll part from the rear side of the longitudinal direction of the laminated roll unit,
Roll end portions located at both ends of the width direction of the laminated roll unit, the nub in a state sandwiched between the laminating roll part has been folded back on the front side of the normal direction of the laminating roll portion ,
The longitudinal direction of the front end of the upper Symbol piece unit, over the entire length of the width direction, than the longitudinal direction of the front end of the roll ends, being located on the rear side of the front-rear direction Is in the airbag.

In the airbag, the laminated roll portion is laminated on the front side of the central portion, the small piece portion is arranged to reach the front side of the laminated roll portion, and the roll end portion sandwiches the small piece portion. Thus, it is folded back to the front side of the laminated roll part. And the front-end | tip of the said small piece part is arrange | positioned so that it may be located inside the said front side edge part of the said airbag on the said surface side surface of the said lamination | stacking roll part.
Therefore, the airbag can be inflated and deployed quickly and reliably.

  That is, since the small piece portion is sandwiched between the laminated roll portion and the roll end portion, the airbag is deployed from the laminated roll portion and the roll end portion to the small piece portion at the initial stage of deployment of the airbag. Takes resistance to inhibit. As described above, the portion sandwiched between the laminated roll portion and the roll end portion is reduced by disposing the tip of the small piece portion inside the front end portion of the airbag. be able to.

  Therefore, the resistance applied to the small piece part from the laminated roll part and the roll end part can be reduced. Thereby, the said small piece part becomes easy to slip out between between the said lamination | stacking roll part and the said roll edge part, raising the said roll edge part. Therefore, the small piece part, the laminated roll part, and the roll end part can be easily deployed, and the airbag can be expanded and deployed quickly and reliably.

  Further, by adjusting the distance between the tip of the small piece portion and the front end portion of the airbag, the timing at which the small piece portion comes out from between the laminated roll portion and the roll end portion is adjusted. be able to. Thereby, the expansion direction in the initial stage of the airbag and the timing of expansion and deployment can be arbitrarily set.

  As described above, the airbag can be inflated and deployed quickly and reliably.

Sectional drawing which shows the airbag in Example 1 (equivalent to the BB arrow cross section of FIG. 2). Explanatory drawing which shows the airbag seen from the front side in Example 1. FIG. FIG. 3 is an explanatory view showing the airbag viewed from the front side in the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. The top view which shows the double sheet | seat before folding in Example 1. FIG. Sectional drawing which shows the double sheet | seat before folding in Example 1. FIG. The top view which shows the double sheet | seat in which the lamination | stacking roll part in Example 1 was formed. Sectional drawing which shows the double sheet | seat in which the laminated roll part in Example 1 was formed. The top view which shows the double sheet | seat which folded the small piece part in Example 1. FIG. Sectional drawing which shows the double sheet | seat which folded the small piece part in Example 1. FIG. Sectional drawing of the airbag corresponding to FIG. 1 which shows the other example of a shape of a small piece part. Explanatory drawing of the airbag corresponding to FIG. 3 which shows the other example of a shape of a roll edge part.

In the airbag, in the state where the double sheet is folded , the distance A between the front end in the front-rear direction of the small piece portion and the front end in the front-rear direction of the roll end portion is the roll end portion. It is preferable to have a relationship of 0.1L <A <0.9L with respect to the total length L in the front-rear direction . In this case, the deployability and folding workability of the airbag can be improved. By setting 0.1L <A, the deployability of the airbag can be improved reliably. Further, by setting A <0.9L, the small piece portion can be easily arranged on the laminated roll portion, and the airbag can be easily folded.

  The distance A and the total length L preferably have a relationship of 0.2L <A <0.8L. In this case, the deployability and folding workability of the airbag can be improved more reliably.

The first fabric portion and the second fabric portion at the front end in the front-rear direction of the small piece portion are folded into the double sheet, and the front side of the small piece portion in the front-rear direction. A quadruple overlapping portion is formed at the end portion of the small piece portion, in which the double first fabric portion and the double second fabric portion are combined to form a quadruple overlap. The front end in the front-rear direction may be formed by the front end in the front-rear direction of the quadruple overlapped portion . In this case, the distance between the tip of the small piece portion and the front end of the laminated roll portion can be adjusted without changing the shape of the airbag. Further, by folding the double sheet inside, the high-pressure gas can be smoothly introduced, and the airbag can be expanded and expanded.

Example 1
An embodiment according to the airbag will be described with reference to FIGS.
As shown in FIGS. 5 and 6, the airbag 1 includes a first fabric portion (base fabric) 11 having an introduction port 111 for introducing high-pressure gas, and a first fabric portion 11 connected to the first fabric portion 11. 11 includes a second fabric portion (base fabric) 12 that forms a bag shape together with 11 and folds the double sheet 10 in which the first fabric portion 11 and the second fabric portion 12 are developed in a planar shape and overlapped with each other. It consists of

The double sheet 10 is divided into three regions in the longitudinal direction X, the central portion 21 where the introduction port 111 exists, and the large piece portion 22 and the small piece portion 23 that are respectively located on both sides of the longitudinal direction X across the central portion 21. have.
In the central portion 21, the first fabric portion 11 side is the back side, the second fabric portion 12 side is the front side, the large piece portion 22 side is the front side, and the small piece portion 23 side is the rear side.
As shown in FIGS. 1 to 3, the large piece portion 22 forms a laminated roll portion 220 that is bent and wound a plurality of times along a plurality of folding lines 24 (FIG. 5) that are substantially orthogonal to the longitudinal direction X. Laminated on the front side of the central portion 21.

As shown in FIGS. 1 to 3, the small piece portion 23 is disposed along the laminated roll portion 220 so as to reach the front side from the rear side of the laminated roll portion 220.
The roll end portions 25 at both ends in the direction perpendicular to the longitudinal direction X in the laminated roll portion 220 are folded back to the front side of the laminated roll portion 220, and the small piece portion 23 is sandwiched between the laminated roll portion 220 and the roll end portion 25. It is.
The small piece portion 23 is arranged so that the tip end portion 231 is positioned on the inner side of the front end portion of the airbag 1 on the front surface of the laminated roll portion 220.

This will be described in more detail below.
As shown in FIGS. 5 and 6, in the airbag 1, the arrangement direction of the first fabric portion 11 and the second fabric portion 12 in the central portion 21 is a normal direction Z, and the large piece portion 22 and the small piece portion from the central portion 21. The direction in which 23 extends is defined as the longitudinal direction X, and the normal direction Z and the direction orthogonal to the longitudinal direction X are defined as the width direction Y.
As shown in FIG. 4, the airbag 1 shown in this example is used for an airbag device 100 that protects a passenger in a passenger seat in an automobile. The airbag device 100 is arranged in an instrument panel 104 provided on the front side of the vehicle with respect to the passenger seat, and an inflator 101 that generates high-pressure gas, and an airbag that expands by introducing high-pressure gas. 1 and a case 102 for storing them.

  In the airbag device 100, when an automobile collides and senses an impact, the inflator 101 generates high-pressure gas. When the high-pressure gas is introduced into the airbag 1, the airbag 1 is inflated to push open a door portion (not shown) formed in the instrument panel 104, and the inflated airbag 1 is It is deployed toward the passenger on the passenger seat.

  As shown in FIGS. 5 and 6, the airbag 1 is formed of a low-breathable material woven from synthetic fibers, and includes a first fabric portion 11 having an inlet 111 for introducing high-pressure gas, A first fabric portion 11 is provided, and a second fabric portion 12 that forms a bag shape together with the first fabric portion 11 is provided. At the time of non-expansion, the first fabric portion 11 and the second fabric portion 12 constitute a double sheet 10 that is overlapped in a planar shape.

  The double sheet 10 is formed so as to gradually widen from both ends in the longitudinal direction X toward the center, and forms a substantially quadrangular pyramid three-dimensional shape when inflated (FIG. 4). In addition, the double sheet 10 has three regions in the longitudinal direction X: a central portion 21 where the introduction port 111 exists, and a large piece portion 22 and a small piece portion 23 located on both sides of the longitudinal direction X across the central portion 21. It is divided into.

As shown in FIGS. 4 and 5, in this example, a virtual line 211 is formed around the introduction port 111. The virtual line 211 has a quadrangular shape, and is formed at a position slightly smaller than the position of the case inner peripheral edge 103 with respect to the introduction port 111 when the airbag 1 is stored in the case 102.
The central portion 21 is set in the same range as the width dimension 211a of the virtual line 211 in the longitudinal direction X. The large piece portion 22 extends from the central portion 21 toward the front side, and the small piece portion 23 extends from the central portion 21 toward the rear side. The length dimension of the large piece portion 22 in the longitudinal direction X is the length dimension of the small piece portion 23. It is set larger than

  As shown in FIGS. 7 and 8, the large piece portion 22 forms a laminated roll portion 220 that is bent and wound a plurality of times along a plurality of fold lines 24 that are substantially orthogonal to the longitudinal direction X to form the front side of the central portion 21. Are arranged in layers. In this example, the large piece portion 22 is bent along the boundary line 212 (FIG. 5) with the central portion 21 so as to be arranged on the front side of the central portion 21, and then is folded into four folding lines 24 (FIG. 5). Then, the laminated roll part 220 is formed by bending and winding sequentially from the front end side to the front side. Note that the interval between the adjacent folding lines 24 is set as appropriate so that the airbag 1 fits in the case 102.

As shown in FIGS. 9 and 10, the small piece portion 23 constitutes a quadruple overlapping portion 232 in which the tip end portion is folded into the double sheet 10 and overlapped four times. That is, the distal end portion of the rear side of the small piece 23 in the double seat 10, the first fabric portion 11 so as to be sandwiched between the second fabric portion 12 has been folded to the inside of the double seat 10, The tip of the quadruple overlapping portion 232 has a first tip portion 233 and a second tip portion 234 in which the first fabric portion 11 and the second fabric portion 12 are folded, respectively.

  The small piece part 23 in which the quadruple overlapping part 232 is formed is arranged along the laminated roll part 220 so as to reach the front side from the rear side of the laminated roll part 220. At this time, as for the small piece part 23, the 1st front-end | tip part 233 and the 2nd front-end | tip part 234 are located inside (rear side) rather than the edge part of the front side of the airbag 1 on the surface of the front side of the lamination | stacking roll part 220. Are arranged as follows. In this example, the distance A between the front end portion 231 of the small piece portion 23 and the front end portion of the laminated roll portion 220 is 0.5 L = A with respect to the total length L in the longitudinal direction X of the airbag 1. It is set to be related.

  As shown in FIGS. 2, 3, and 9, in the width direction Y, the roll end portions 25 arranged outside the width dimension 211 b of the imaginary line 211 at both ends of the laminated roll portion 220 have the small pieces 23. It is folded on the front side of the laminated roll part 220 with being sandwiched. In this example, when the roll end portions 25 at both ends are folded back, the leading ends thereof are arranged at a substantially central position on the front side of the laminated roll portion 220.

Next, the function and effect of this example will be described.
In the airbag 1, the laminated roll portion 220 is laminated on the front side of the central portion 21, the small piece portion 23 is arranged to reach the front side of the laminated roll portion 220, and the roll end portion 25 sandwiches the small piece portion 23. It is folded back to the front side of the laminated roll part 220. And the 1st front-end | tip part 233 and the 2nd front-end | tip part 234 of the small piece part 23 are located inside (rear side) rather than the edge part of the front side of the airbag 1 on the surface of the front side of the lamination | stacking roll part 220. Has been placed.
Therefore, the airbag 1 can be inflated and deployed quickly and reliably.

  That is, since the small piece portion 23 is sandwiched between the laminated roll portion 220 and the roll end portion 25, the small piece portion 23 is developed from the laminated roll portion 220 and the roll end portion 25 to the small piece portion 23 at the initial stage of deployment of the airbag 1. Takes resistance to inhibit. As described above, by arranging the first tip portion 233 and the second tip portion 234 of the small piece portion 23 on the inner side of the front end portion of the airbag 1, the stacked roll portion 220 and the roll end portion 25 are arranged. The part sandwiched between them can be reduced.

  Therefore, the resistance applied to the small piece portion 23 from the laminated roll portion 220 and the roll end portion 25 can be reduced. Thereby, the small piece portion 23 is easily pulled out from between the laminated roll portion 220 and the roll end portion 25. Therefore, the small piece portion 23, the laminated roll portion 220, and the roll end portion 25 can be easily deployed, and the airbag 1 can be inflated and deployed quickly and reliably.

  Further, by adjusting the distance between the first tip portion 233 and the second tip portion 234 and the front end portion of the airbag 1, the small piece portion 23 can be removed from between the laminated roll portion 220 and the roll end portion 25. The exit timing can be adjusted. Thereby, the expansion | deployment initial stage in the airbag 1 and the timing of expansion | swelling and expansion | deployment can be set arbitrarily.

  The distance A between the first tip portion 233 and the second tip portion 234 and the front end portion of the laminated roll portion 220 is 0.1 L <A with respect to the total length L in the longitudinal direction X of the airbag 1. <0.9L relationship. Therefore, the deployability and folding workability of the airbag 1 can be improved.

  Further, the tip of the small piece portion 23 constitutes a quadruple overlapping portion 232 that is folded into the double sheet 10 and overlapped four times. Therefore, the distance A between the tip of the small piece portion 23 and the front end of the laminated roll portion 220 can be adjusted without changing the shape of the airbag 1. Further, by folding the double sheet 10 into the inside, the high pressure gas can be smoothly introduced, and the inflation and deployability of the airbag 1 can be improved.

  As described above, according to the airbag 1 of this example, it can be quickly and reliably inflated and deployed.

In the airbag 1 shown in the first embodiment, the quadruple overlapping portion 232 is formed at the tip portion 231 of the small piece portion 23. However, the present invention is not limited to this, and as shown in FIG. You may fold as it is.
Moreover, when the dimension of the width direction Y in the roll end part 25 is large, as shown in FIG. 12, you may return | fold further toward the width direction Y outer side from the center side of the lamination | stacking roll part 220. FIG.
Moreover, the number of the fold lines 24, the number of folds, and the fold direction of the large piece portion 22 when forming the laminated roll portion 220 described above are examples, and can be changed as appropriate.
In any of the above forms, the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Air bag 10 Double sheet | seat 11 1st fabric part 111 Introduction port 12 2nd fabric part 21 Center part 22 Large piece part 220 Laminated roll part 23 Small piece part 231 Tip part 24 Bending line 25 Roll end part

Claims (4)

A first dough portion having a inlet for introducing high pressure gas, a second fabric portion for constituting the bag-shaped with first dough part I Tsurana to the first fabric portion overlaps the flat an airbag that double sheet Tsu case has been configured folding Marete,
In the state where the double sheet is folded,
The portion of the double sheet that includes the inlet is the central portion, the portion of the double sheet that is located on one side of the central portion is the large piece portion, and the double sheet is on the other side of the central portion. A portion that is a portion and is shorter than the large piece portion from the center of the introduction port in the central portion is a small piece portion,
With the central portion as a reference, the direction in which the first fabric portion and the second fabric portion overlap in the central portion is a normal direction, orthogonal to the normal direction and the large piece portion and the The direction in which the small piece part is connected is the front-rear direction, and the normal direction and the direction orthogonal to the front-rear direction are the width direction,
Further, the side where the second fabric portion of the central portion overlaps the first fabric portion of the central portion is the front side in the normal direction, and the side where the large piece portion is connected to the central portion is the front-rear direction. When the side where the small piece part is connected to the front side, the center part is the rear side in the front-rear direction,
The large piece portion is formed as a laminated roll portion that is bent and wound a plurality of times along a plurality of bending lines parallel to the width direction, and the laminated roll portion is arranged on the front side in the normal direction with respect to the central portion . Is placed ,
The nubs are along the laminating roll portion is disposed on the front side of the normal direction of the laminating roll part from the rear side of the longitudinal direction of the laminated roll unit,
Roll end portions located at both ends of the width direction of the laminated roll unit, the nub in a state sandwiched between the laminating roll part has been folded back on the front side of the normal direction of the laminating roll portion ,
The longitudinal direction of the front end of the upper Symbol piece unit, over the entire length of the width direction, than the longitudinal direction of the front end of the roll ends, being located on the rear side of the front-rear direction Airbag. In the state where the double sheet is folded,
The distance A between the front end of the small piece portion in the front-rear direction and the front end of the roll end portion in the front-rear direction is 0.1 L <A with respect to the total length L of the roll end portion in the front-rear direction. The airbag according to claim 1, wherein the airbag has a relationship of <0.9 L. The first fabric portion and the second fabric portion at the front end in the front-rear direction of the small piece portion are folded into the double sheet ,
At the front end of the small piece portion in the front-rear direction, a double overlapping portion is formed in which the double first cloth portion and the double second cloth portion are combined to form a four-fold overlap. Has been
The airbag according to claim 1 or 2, wherein the front end in the front-rear direction of the small piece part is formed by the front end in the front-rear direction of the quadruple overlapped part . The airbag according to any one of claims 1 to 3, wherein the roll end portion is folded outside the range where the small piece portion exists in the width direction.

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