JPH0571063U - Bag structure of vehicle airbag - Google Patents

Abstract

(57) [Summary] [Purpose] The strap has a sufficient strength to be sewn to the bag body and has sufficient strength. [Structure] The strap 28 is composed of strips 30, 3 having the same structure.
2 and the seam allowances 34 are provided at both ends thereof. Both ends of the strap 28 provided with the seam allowance 34 are T-shaped so that the tension force of the strap 28 applied when the airbag bag 24 is inflated is evenly distributed to both seam allowances 34. Is transmitted. The fabric 36 applied as the strap 28 has a so-called bag-shaped portion (branching portion) at a plurality of locations.
It is cut at the middle portion of and is applied as a seam allowance 34.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bag structure of a vehicle airbag that protects an occupant by a bag body that is provided in a vehicle and that is deployed inside the vehicle compartment when an impact or the like is input.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, an airbag device mounted on a side door of a vehicle has been proposed as a device for protecting an occupant when a lateral impact load is applied to a side portion of the vehicle (as an example, JP-A-2-249740). (See the official gazette).

Such an airbag device for a vehicle is a device that protects an occupant by normally expanding a bag body that is folded and accommodated in an airbag cover by expanding the bag body and advancing to the side of the occupant. Is.

The bag body used in such an airbag device for lateral protection of the occupant is devised so that it can be deployed in a wide range in a relatively elongated shape from the vicinity of the waist to the head of the occupant. That is, as shown in FIG. 16, a strap 62 is laid between two points on the inner surface of the bag body 60, both ends of which are sewn to the bag body 60, and when the strap 62 is tensioned, a further bulge occurs. Is restricted and is being deployed in a long and narrow manner.

As a result, the bag body 60 can be formed into a desired shape (elongated shape that expands over a wide range), and the occupant can be reliably protected.

[0006]

[Problems to be solved by the device]

 However, the seam allowance 64 for sewing the strap 62 to the bag body 60 is a portion in which the end portion of the strap 62 is bent into a substantially L shape. With such a seam allowance 54, when a tension force is applied to the strap 62, a large force is applied to the bent portion 64A, and the strength should be higher so that the sewing does not break. ..

In view of the above facts, the present invention has an object to obtain a bag structure for an airbag for a vehicle, which can increase the sewing force of the strap to the bag body and have sufficient strength.

[0008]

[Means for Solving the Problems]

 According to a first aspect of the present invention, there is provided a bag structure for a vehicle airbag in which a bag body that is deployed inside a vehicle is for a passenger contact, and the bag body is hung between two points on the inner surface side of the bag body. It is characterized in that it has a strap that is sewn and sewn to limit the bulging shape of the bag body when the bag body is developed, and that a T-shaped seam allowance is provided at the engaging portion of the strap with the bag body.

The invention according to claim 2 is characterized in that the strap is made of a band-shaped woven fabric having a branch portion partially branched in the strap thickness direction, and the branch portion is a T-shaped seam allowance. There is.

According to a third aspect of the present invention, the strap has a branch portion branched at a widthwise middle portion along a line connecting the two points, and the branch portions are staggered in the strap thickness direction. It is characterized by being bent to form a T-shaped seam allowance.

According to a fourth aspect of the present invention, the strap is woven in a bag shape, and overlapping portions of the open ends of the bag strap are bent in opposite directions to form a T-shaped seam allowance. It is characterized by

[0012]

[Action]

 According to the invention of claim 1, the seam allowance of the strap sewn to the bag is T-shaped. Therefore, the tension of the strap applied when the bag is unfolded is evenly distributed from the strap end to the seam allowances on both sides. For this reason, it is possible to withstand greater tension than before, and even if the tension applied to the strap is increased, the sewing does not break, and the bag has the desired shape, e.g., an elongated and wide area. The occupant's waist and head can be reliably protected.

According to the second aspect of the present invention, when the T-shaped seam allowance is provided, a branch portion branched in the strap thickness direction is provided, and the branched portion is applied as the T-shaped seam allowance. Therefore, workability at the time of creating the strap is good.

According to the third aspect of the invention, when the T-shaped seam allowance is provided, the end portion of the single piece of fabric is branched at the widthwise intermediate portion along the line connecting the two points, and the branch is formed. The parts are formed so that they are bent alternately in the strap thickness direction. This eliminates the need for special fabrics.

According to the invention of claim 4, when the T-shaped seam allowance is provided, a bag-shaped fabric is formed, and the overlapping portions of the open ends of the bag-shaped fabric are bent in opposite directions. Is forming. Therefore, the entire strap is doubled, and the strength of the strap itself is increased. Further, a member having a thinner wall than the conventional woven fabric having a strap can be applied.

The present invention is not limited to the airbag device for inputting a shock from the side of the vehicle, but can be applied to airbags provided in other places such as steering, front passenger seat, and rear seat. ..

[0017]

【Example】

 First Embodiment FIG. 1 shows an airbag device 10 attached to a side door of a vehicle according to this embodiment.

The upper end and the lower end of the bracket 10 A of the airbag device 10 are fixed to the front side door inner panel 16 from the passenger compartment side by bolts 12 and nuts 14, respectively. , Covered with an airbag cover 18.

The airbag cover 18 is further covered with a trim cover 22 which is detachably attached to the opening of the door trim 20. Since the trim cover 22 is substantially flush with the door trim 20 in the mounted state, the airbag device 10 is completely hidden from the passenger compartment and has a good appearance.

An airbag bag body 24 is accommodated in the airbag cover 18 in a folded state, and an inflator 26 is attached to the airbag bag body 24. The inflator 26 is filled with a gas generating substance, and the gas generating substance is provided with an ignition means. In the inflator 26, when a sensor (not shown) detects a shock input from the side of the vehicle, the gas generating substance is ignited through the ignition means to start combustion, and the gas generated by combustion is ejected from a large number of openings. Then, the air bag body 24 is inflated (see FIG. 2).

As shown in FIGS. 3 and 4, the airbag bag body 24 is inflated over a wide range when inflated and has an elongated shape. For this reason, the airbag bag 24 advances from the waist of the seated occupant 27 to the vicinity of the head, and can reliably protect the occupant 27 against an impact input from the vehicle side direction.

As shown in FIG. 5, a strap 28 is stretched between two points inside the airbag body 24. The strap 28 has a function of becoming tense when the airbag bag body 24 is inflated and suppressing further bulging of the airbag bag body 24. By straddling the strap 28 at a plurality of predetermined positions, the shape of the airbag bag body 24 when inflated can be set.

Both ends of the strap 28 are attached to the inner surface side of the airbag bag 24 by sewing. That is, the strap 28 is composed of the strips 30 and 32 having the same structure, and the seam allowances 34 are provided at both ends thereof. Both ends of the strap 28 provided with the seam allowance 34 are T-shaped.

That is, the tension of the strap 28 applied when the airbag 24 is inflated is evenly distributed and transmitted to both of the seam allowances 34.

As shown in FIGS. 6 and 7, as the strap 28, a bag-woven band-shaped woven fabric 36 is applied. This woven fabric 36 has a so-called bag shape at a plurality of locations by weaving the warp yarn C into the weft yarns A and B, respectively, and further connecting the weft yarns A and B intermittently by the connecting yarn D. The formed part (branch part 38) is formed. In this embodiment, in order to apply the woven fabric 36 to the strips 30 and 32, the woven fabric 36 is cut at an intermediate portion of the branch portion 38 (see a chain line in FIG. 6). After the cutting, the branch portions 38 can be applied as the seam allowance 34 by bending the branch portions 38 in the directions away from each other.

On the other hand, by cutting at a place other than the branch portion 38 (see the alternate long and short dash line in FIG. 6), this cut portion becomes the other end portions of the strips 30 and 32.

The other ends of the strips 30 and 32 are sewn and connected to each other, and the length of the entire strap 28 is adjusted by the overlapping amount at the time of sewing.

The operation of the first embodiment will be described below. When the vehicle is in a normal state, the sensor does not detect a shock input, so the airbag device 10 does not operate, and the airbag bag body 24 is maintained in the state accommodated in the airbag cover 18.

When an impact is input from the side of the vehicle, the sensor detects it. As a result, the ignition means is ignited, the gas generating substance is burned, and the inside of the airbag bag body 24 is filled through the opening of the inflator 26. Due to this gas pressure, the air bag body 24 inflates, breaks the air bag cover 18, and advances to the side portion of the occupant 27 who is seated.

Since a plurality of straps 28 are stretched around the inside of the airbag bag 24 and the expansion is partially suppressed by the straps 28, the expanded shape is elongated. Therefore, the airbag body 24 is inflated in a wide range from the waist to the head of the occupant 27, and the occupant 27 can be protected from the impact input from the side of the vehicle.

Here, a large tension is applied to the strap 28 that suppresses the inflation of the airbag bag 24. This tension is applied to the seam allowances 34 at both ends of the strap 28 for sewing the airbag bag body 24.

However, since both ends of the strap 28 of the present embodiment are T-shaped and the seam allowances 34 are extended in the directions away from each other, the tension applied to the middle portion of the strap 28 is left and right. It is evenly distributed over the seam allowance 34. Therefore, this tension does not break the sewing. By providing the T-shaped seam allowance 34, the tension resistance is about 600 Kg, which is significantly higher than the conventional tension resistance (200 Kg) for half-folding (L-shaped seam allowance).

Further, since the length can be adjusted by the overlapping amount of the strips 30 and 32, the shape (length) of the strips 30 and 32 itself is different from that of the strap 28 applied to each of various vehicles. They can be the same, the parts can be unified, and the yield is good. Further, when a plurality of straps 28 having different lengths are applied to one air bag body 24, the overlapping amount of the belts 30 and 32 may be adjusted.

As described above, in the present embodiment, by making both ends of the strap 28 T-shaped, it is possible to disperse the tension force applied to the strap 28 when the airbag is inflated, and the strength of the T-shaped seam allowance 34. Is improved.

In the first embodiment, when forming the branch portion 38, the connecting threads D are used to connect the weft threads A and B. However, as shown in FIG. 8, one of the weft threads A and B is connected. Alternatively, the parts may be arranged in a continuous straight line to form a single fabric 36. In this case, the part where the weft yarns A and B are branched becomes the branching part 38.

Further, as shown in FIGS. 9A and 9B, a bag-shaped branch portion formed by weaving the weft yarn and the warp yarn in the opposite directions to those of the first embodiment. Cut along the weft direction of No. 38 (see the dashed line in Fig. 9 (A)), and then cut along the warp direction with a predetermined width (see the chain line in Fig. 9 (A)) 28 may be formed. [Second Embodiment] A second embodiment of the present invention will be described below. The description of the same components as those in the first embodiment will be omitted.

As shown in FIG. 10, in the second embodiment, one end of the normally woven sheet-shaped fabric 44 is cut to a predetermined length at the widthwise middle portion. The pair of cut and separated pieces 45 and 46 are alternately bent in the thickness direction as shown in FIG. 11 to form a T-shaped seam allowance 47.

As described above, since only a part of the ordinary fabric is cut, the strap making operation becomes easy.

In the second embodiment, as shown in FIG. 12, the two weft threads A and B are used in advance to split the pieces 45 and 46 into weaves and cut along the alternate long and short dash line in FIG. Then, the strap 28 may be formed. [Third Embodiment] The third embodiment of the present invention will be described below.

As shown in FIG. 13, the fabric 50 of the third embodiment is woven in a bag-closed shape. Pieces 52, 54 are formed by cutting at a plurality of points woven in the bag closed shape (see the dashed line in FIG. 13) and cutting a part of the broken line portion 50A (see the dashed line in FIG. 13). By bending these pieces 52 and 54 in opposite directions, a T-shaped seam allowance 56 is formed as shown in FIG.

Since the entire strap 58 thus formed has a double structure, the strap 58 having excellent strength can be formed. It should be noted that the cutting for forming the pieces 52, 54 (cutting along the chain line in FIG. 13) is a heat cut, so that the thread is not welded and further torn.

[Fourth Embodiment] A fourth embodiment of the present invention will be described below.

As shown in FIG. 15, in the fourth embodiment, a normal strip-shaped woven fabric 40 is superposed in two layers, and the overlapped one ends are bent in directions away from each other, and a seam allowance 42 is provided. .. In this case, since the middle portion of the strap 28 is also doubled, even if a single fabric 40 having a small wall thickness is applied, it is possible to sufficiently withstand the tension force.

[0044]

[Effect of the device]

 As described above, the bag structure for a vehicle airbag according to the present invention has an excellent effect that the strap can be sewn to the bag body and have sufficient strength.

[Brief description of drawings]

FIG. 1 is a side view of an airbag device according to an embodiment of the present invention as viewed from the front of a vehicle.

FIG. 2 is a side view showing a state in which the airbag device is activated from the state of FIG.

FIG. 3 is a side view showing the inflated shape of the airbag bag as viewed from the front of the vehicle.

FIG. 4 is a perspective view of the airbag bag body when inflated.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a perspective view of a hollow weave fabric applied as a strap.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a cross-sectional view corresponding to the line VII-VII in FIG. 6 showing a modification of the weaving method of the weft yarn and the warp yarn according to the first embodiment.

9A is a perspective view showing a modified example of the woven fabric according to the first embodiment, and FIG. 9B is an intermediate process diagram for forming a strap from the woven fabric of FIG. 9A.

FIG. 10 is a plan view of a fabric applied as a strap according to a second embodiment.

11 is a perspective view of a strap according to a second embodiment formed by processing the fabric of FIG.

FIG. 12 is a cross-sectional view taken along line XII-XII of FIG. 10, showing a modification of the weaving method of the weft yarn and the warp yarn of the fabric according to the second example.

FIG. 13 is a perspective view of a fabric applied as a strap according to a third embodiment.

FIG. 14 is a perspective view of a strap formed by processing the fabric shown in FIG.

FIG. 15 is a sectional view showing a strap according to a fourth embodiment, corresponding to FIG. 5;

FIG. 16 is a cross-sectional view showing a strap spanning structure according to a conventional example.

[Explanation of symbols]

 10 Airbag device 24 Airbag bag 28 Strap 30 Band 32 Band 34 Seam allowance

Continuation of the front page (72) Creator Minoru Miyagawa 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (4)

[Scope of utility model registration request] 1. A bag structure of a vehicle airbag in which a bag body that expands toward the passenger compartment is for a passenger contact, and is sewn by being stretched between two points on the inner surface side of the bag body. A bag structure for a vehicle airbag, comprising a strap that restricts a bulging shape of the bag body when the bag body is deployed, and a T-shaped seam allowance is provided at an engaging portion of the strap with the bag body. . 2. The vehicle according to claim 1, wherein the strap is made of a band-shaped woven fabric having a branch portion partially branched in the strap thickness direction, and the branch portion has a T-shaped seam allowance. Airbag bag structure. 3. The T-shaped seam allowance, wherein the strap has a branch portion branched at a middle in the width direction along a line connecting the two points, and the branch portions are alternately bent in the strap thickness direction. The bag body structure for a vehicle airbag according to claim 1, wherein the bag body structure is formed. 4. The strap is woven into a bag shape,
2. The bag structure for a vehicle airbag according to claim 1, wherein the overlapping portions of the opening ends of the bag-shaped strap are bent in opposite directions to form a T-shaped seam allowance.