JP4089574B2 - Airbag - Google Patents

Description

  The present invention relates to an airbag provided with a vent hole capable of exhausting excess inflation gas when the internal pressure rises above a predetermined value.

Conventionally, an airbag equipped with a vent hole is opened only when the internal pressure rises above a predetermined value, and before the vent hole is opened, the inflation gas is effectively used to expand and inflate the airbag. (For example, refer to Patent Document 1).
JP 2002-144996 A

  However, in the conventional airbag, in addition to drilling to form a vent hole, a member that closes the vent hole is sewn to close the vent hole so that the vent hole is not opened up to a predetermined internal pressure value. This was necessary, and it took time and effort to manufacture.

  This invention solves the above-mentioned subject, and it aims at providing the airbag which can be manufactured easily even if it has the vent hole opened only when the internal pressure rises more than a predetermined value. .

The airbag according to the present invention is an airbag provided with a vent hole that is opened when the internal pressure rises to a predetermined value or more and can exhaust the inflation gas,
A coating agent for preventing gas leakage is applied to the outer peripheral surface of the airbag fabric,
The periphery of the vent hole is adhered to a portion facing the vent hole on the inner peripheral surface side of the base fabric so that the coating agent can be opened and the vent hole is closed.

  In the airbag according to the present invention, after performing drilling processing or the like so as to form a vent hole in the base fabric, a coating agent is applied to the outer surface side, and at that time, the inner peripheral surface of the base fabric is simply applied. If the coating agent is applied to the outer surface of the base fabric, including the vent hole opening area, with the edge of the vent hole in contact with the vent hole on the side, the manufacturing process is simplified. can do.

  In the airbag manufactured in this way, when the inflation gas is introduced and inflated, the periphery of the vent hole is adhered to the portion facing the vent hole on the inner peripheral surface side of the base fabric by the coating agent, The airbag expands and inflates until the internal pressure of the airbag rises above a predetermined value, and if the internal pressure of the airbag rises above a predetermined value due to an occupant interfering with the airbag, etc. The peripheral edge is peeled off, the vent hole is opened, and excess inflation gas is exhausted from the opened vent hole, thereby preventing an increase in the internal pressure of the airbag over a predetermined value.

  Therefore, even if the airbag according to the present invention has a vent hole that is opened only when the internal pressure rises above a predetermined value, the coating agent for preventing gas leakage is simply performed after drilling the vent hole. It can be easily manufactured simply by coating.

  In addition, after the vent hole is opened, the periphery of the vent hole is separated from the part facing the vent hole, and the part around the vent hole in the airbag can be inflated thickly. The occupant can be protected at the site with good cushioning properties. Incidentally, on the contrary, since the thickness of the airbag can be reduced before the vent hole is opened, it is suitable when the airbag is deployed in a narrow space in the initial stage of inflation.

  Note that in an airbag in which the base fabric is manufactured by bag weaving, for example, a head protection airbag that is folded and stored on the upper edge side of the vehicle side window in the head protection airbag device, the gas is provided on the inner peripheral surface side. Since the coating agent for preventing leakage cannot be applied to the inner peripheral surface side, the coating agent is applied to the outer peripheral surface side of the base fabric, and the present invention can be suitably applied. Of course, in the bag-woven airbag, not only the head protecting airbag but also a pedestrian protecting airbag mounted on the front side of the vehicle can be exemplified. Even in a sewing airbag manufactured by overlapping and stitching, a coating agent for preventing gas leakage may be applied in order to improve the sealing performance of the stitched portion. Can be applied.

  And two vent holes may be arrange | positioned in the site | part which the base fabric of an airbag opposes, and the mutual periphery of two vent holes may be adhere | attached with the coating agent.

  If configured in this way, when the inflation gas flows into the airbag and the internal pressure rises above a predetermined value, it becomes possible to open two vent holes at the same time. If applied to an airbag that can rapidly exhaust gas and the internal pressure is likely to increase rapidly when the occupant is restrained, the reaction force to the occupant when restraining the occupant can be suppressed and can be suitably used.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, an airbag 20 of the embodiment is used in a head protection airbag device M mounted on a vehicle V. Is. The head protecting airbag device M includes an airbag 20, an inflator 12, mounting brackets 10 and 13, and an airbag cover 8. The airbag 20 extends from the lower edge side of the front pillar part FP to the upper side of the rear pillar part RP from the lower edge side of the front pillar part FP on the upper edge side of the side windows W1 and W2 inside the vehicle V. It is folded and stored in the range.

  As shown in FIGS. 1 and 2, the inflator 12 is a substantially cylindrical cylinder type, and is provided with a connection port portion 23 for allowing the inflation gas in the airbag 20 to flow in. The bag 20 is connected. The inflator 12 is attached and fixed to the inner panel 2 of the roof side rail portion RR near the upper portion of the center pillar portion CP by being covered with the lower edge 5a of the roof head lining 5 using the mounting bracket 13. Yes. The inner panel 2 is a member on the body (vehicle body) 1 side of the vehicle V. The mounting bracket 13 is made of sheet metal, holds the inflator 12, and is fixed to the inner panel 2 using the mounting bolts 14.

  Each mounting bracket 10 is composed of two sheet metal plates (see FIG. 5), and is attached to each mounting portion 33 so as to sandwich each mounting portion 33 of the airbag 20. The portion 33 is fixedly attached to the inner panel 2. Each mounting bolt 11 is fastened to a mounting hole 2a formed in the inner panel 2 by providing a nut 2b.

  The airbag cover 8 is configured from the lower edges 4a and 5a of the pillar garnish 4 disposed in the front pillar portion FP and the roof head lining 5 disposed in the roof side rail portion RR. The front pillar garnish 4 and the roof head lining 5 are made of synthetic resin, and are fixedly attached to the inner side of the inner panel 2 of the body 1 at the front pillar portion FP and the roof side rail portion RR, respectively. . Further, the roof head lining 5 is disposed from the vicinity above the front pillar portion FP to the vicinity above the rear pillar portion RP via the center pillar portion CP.

  As shown in FIGS. 1 to 4, the airbag 20 was applied to a base fabric 21 as a bag-shaped airbag body manufactured by bag weaving using polyamide yarn or the like, and to the outer surface of the airbag body 21. And a coating agent 38 for preventing gas leakage such as silicon rubber. The airbag 20 is supplied with the inflation gas G from the inflator 12 and deployed from the folded state, and the inner side of the pillar garnishes 7 and 6 of the side windows W1 and W2, the center pillar part CP, and the rear pillar part RP is provided. Expand and expand to cover.

  The airbag main body 21 includes a gas inflow portion 22 that inflates so that the inflation gas G flows in and separates the vehicle interior side wall portion 22a and the vehicle exterior wall portion 22b, and a non-inflow portion 31 that does not allow the inflation gas G to flow in. It is prepared for.

  The non-inflow portion 31 is formed such that the wall portions 22a and 22b of the gas inflow portion 22 are coupled to each other, and includes a peripheral edge portion 32, an attachment portion 33, a thickness regulating portion 34, and a plate-like portion 35. It is configured. The peripheral edge portion 32 is arranged at the outer peripheral edge portion of the airbag 20 and is formed so as to surround the periphery of the gas inflow portion 22. A connecting cloth 36 is connected to the front end of the peripheral edge 32.

  A plurality of attachment parts 33 (six in the embodiment) are arranged so as to protrude upward from the peripheral edge part 32 and the connecting cloth 36 on the upper edge 20a side of the airbag 20, and are attachment brackets for attaching to the inner panel 2 10 is fixed (see FIG. 5). Each attachment portion 33 has an attachment hole 33a through which the attachment bolt 11 is inserted.

  The plate-like portion 35 has a rectangular plate shape and is disposed below the gas supply path portion 24 between the front and rear front seat inflating portions 25 and the rear seat inflating portion 26. The plate-like portion 35 is disposed in order to secure the overall shape of the airbag 20 and reduce the volume of the gas inflow portion 22 to shorten the time until completion of inflation.

  The thickness restricting portion 34 is disposed so as to extend downward from the upper side of the peripheral edge portion 32 and the plate-like portion 35 in the area of each of the front seat and rear seat inflating portions 25 and 26. These thickness restricting portions 34 divide the front seat and rear seat inflating portions 25 and 26 into a plurality of vertical cell portions 25a and 26a to restrict the thickness of the airbag 20 and It is arrange | positioned so that it can expand in a shape. In addition, the vertical cell portions 25a and 26a partitioned by the thickness regulating portion 34 shorten the length of the airbag 20 in the front-rear direction at the time of inflation, so that the airbag 20 on the lower edge 20b side when the inflation is completed. As a result, tension in the front-rear direction is generated.

  In the embodiment, the gas inflow portion 22 includes a connection port portion 23, a gas supply path portion 24, a front seat expansion portion 25, and a rear seat expansion portion 26. The gas supply path portion 24 is arranged in a straight line along the front-rear direction of the vehicle V on the upper edge 20 a side of the airbag 20. A connecting port portion 23 that extends upward and allows the inflation gas G from the inflator 12 to flow into the gas inflow portion 21 is formed at a substantially intermediate portion in the front-rear direction of the gas supply path portion 24. In the gas supply path portion 24, when the expansion gas G flows from the connection port portion 23, the expansion gas G flows toward the both sides in the front-rear direction of the vehicle V.

  The front seat inflating portion 25 is disposed below the front portion of the gas supply passage portion 24, and is disposed on the side of the front seat of the vehicle V when the airbag 20 is deployed and inflated. It will expand to cover the window W1. The rear seat inflating section 26 is disposed below the rear side of the gas supply passage section 24, and is disposed on the side of the rear seat of the vehicle V when the airbag 20 is deployed and inflated. W2 will be covered. The front seat and rear seat inflatable portions 25 and 26 are each divided by a thickness regulating portion 34 and inflated so as to extend in a bar shape in the vertical direction, and are arranged in parallel in the front-rear direction of the vehicle V. It is comprised from the vertical cell part 25a * 26a.

  In the longitudinal cell portion 25am of the intermediate portion in the front-rear direction of the front seat inflating portion 25, vent holes 28 and 29 that are opened circularly are disposed in the vehicle inner wall portion 22a and the vehicle outer wall portion 22b. Yes.

  When the internal pressure in the airbag main body 21 does not rise above a predetermined value when the inflation gas flows in, these vent holes 28 and 29 are provided on the airbag main body 21 as shown in FIG. It is blocked by a coating agent 38 applied to the outer surface side. That is, the coating agent 38 adheres the peripheral portions 28 a and 29 a of the vent holes 28 and 29 to block the vent holes 28 and 29. Note that the internal pressure value of the airbag 20 that opens the vent holes 28 and 29 is such that, for example, the vertical cell portions 25a and 26a are inflated into a rigid rod shape and give a large reaction force to the occupant when restraining the occupant. Set in a range that does not exist.

  The airbag 20 is manufactured by weaving the airbag body 21 and forming the attachment holes 33a and the vent holes 28 and 29 by punching. Further, the outer surface side of the base fabric 21 is manufactured. A coating agent 38 is applied to the substrate. In this case, the peripheral edges 28a and 29a of the vent holes 28 and 29 are simply brought into contact with the portions 22c and 22c facing the vent holes 28 and 29 on the inner peripheral surface side of the base fabric 21, that is, the embodiment. In this case, the coating agent 38 is applied to the outer surface side of the base fabric 21 including the opening portions of the vent holes 28 and 29 while the peripheral edges 28a and 29a are in contact with each other. And if the connection cloth 36 is attached, the airbag 20 can be manufactured.

  Next, the process until the airbag 20 is mounted on the vehicle V will be described. First, the airbag 20 is flatly deployed, and then a crease C between a mountain fold and a valley fold (two points in FIG. 2). A dashed line is attached so that the lower edge 20b side of the airbag 20 approaches the upper edge 20a side.

  After the airbag 20 is folded, a predetermined portion of the airbag 20 is wrapped with a breakable tape (not shown) for preventing collapse, and the inflator 12 and the mounting brackets 10 and 13 are attached, and the airbag is assembled. Form the body.

  Thereafter, the mounting brackets 10 and 13 are arranged at predetermined positions on the inner panel 2 on the body 1 side, and the mounting holes 33a are inserted to fix the bolts 11 and 14, respectively. The airbag assembly is fixed to the panel 2 and attached to the body 1. Next, lead wires (not shown) extending from a control device for operating a predetermined inflator are connected to the inflator 12, the front pillar garnish 4 and the roof head lining 5 are attached to the body 1, and the rear pillar garnish 6 and the center pillar garnish 7 are further attached. If attached to the body 1, the airbag device M can be mounted on the vehicle V.

  When the inflator 12 is activated after the airbag device M is mounted on the vehicle V, the inflation gas G from the inflator 12 is supplied from the connection port 23 as shown by a two-dot chain line in FIG. It flows into the passage portion 24, flows in the gas supply passage portion 24 toward both sides in the front-rear direction, and is supplied into the vertical cell portions 25a and 26a, so that the inflatable portions 25 and 26 of the airbag 20 are unfolded. It begins to expand while letting go. Then, the airbag 20 breaks the wrapped tape (not shown), and further pushes the airbag cover 8 on the lower edges 4a and 5a side of the front pillar garnish 4 and the roof head lining 5 to open them. As shown by the two-dot chain line, while expanding downward, it expands and expands so as to cover the vehicle interior I of the side windows W1, W2, center pillar portion CP, and rear pillar portion RP.

  At this time, the peripheral edges 28a and 29a of the vent holes 28 and 29 are opposed to the portions 22c and 22c (29a and 28a) facing the vent holes 28 and 29 on the inner peripheral surface side of the base fabric 21 as the airbag body. Until the internal pressure of the airbag main body 21 rises to a predetermined value or more until the inner pressure of the airbag body 21 is increased by the coating agent 38 (in the embodiment, the peripheral edges 29a and 28a are bonded by the coating agent 38). As shown in FIG. 4C, if the airbag 20 is deployed and inflated, and the internal pressure of the airbag body 21 rises to a predetermined value or more due to an occupant interfering with the airbag 20, etc. As described above, the mutual adhesion between the peripheral edges 28a and 29a of the vent holes 28 and 29 is peeled off, the vent holes 28 and 29 are opened, and the surplus from the opened vent holes 28 and 29 Inflation gas G is exhausted, it is possible to prevent a rise in internal pressure of a predetermined value or more of the air bag 20.

  In the airbag 20 of the embodiment, the base fabric 21 is perforated so as to open the vent holes 28 and 29, and then the coating agent 38 is applied to the outer surface side. In the state where the peripheral edges 28a and 29a of the vent holes 28 and 29 are in contact with the portions 22c and 22c facing the vent holes 28 and 29 on the inner peripheral surface side of the base 21, that is, in the case of the embodiment, the peripheral edge 28a If the coating agent 38 is applied on the outer surface side of the base fabric 21 so as to fill the opening portions of the vent holes 28 and 29 with the 29a in contact with each other, it can be easily manufactured. .

  Therefore, even if the airbag 20 according to the embodiment includes the vent holes 28 and 29 that are opened only when the internal pressure rises to a predetermined value or more, after the drilling of the vent holes 28 and 29 is performed, the gas leak is simply performed. It can be easily manufactured simply by applying the coating agent 38 for prevention.

  In the airbag 20 of the embodiment, after the vent holes 28 and 29 are opened, the peripheral edges 28a and 29a of the vent holes 28 and 29 are connected to the vent holes 28 and 29 as shown in B and C of FIG. Apart from the opposing portions 22c and 22c, the portions around the vent holes 28 and 29 in the airbag 20 can be inflated thickly. Therefore, the airbag 20 can protect an occupant with good cushioning properties in the vicinity of the vent holes 28 and 29. On the contrary, since the thickness of the airbag 20 can be reduced before the vent holes 28 and 29 are opened, even if the space between the occupant and the window W1 is a narrow space, Can be easily deployed.

  Further, in the airbag 20 of the embodiment, two vent holes 28 and 29 are disposed at the opposite portions of the base fabric 21 of the airbag 20, and the two vent hole peripheral edges 28a and 29a are coated with each other. When the inflation gas G flows into the airbag 20 and the internal pressure rises above a predetermined value, the two vent holes 28 and 29 can be opened simultaneously. Therefore, the surplus inflation gas G can be exhausted rapidly, and if applied to the airbag 20 in which the internal pressure is likely to increase rapidly when the occupant is restrained, the reaction force to the occupant when restraining the occupant can be suppressed. Can be preferably used.

  Of course, like the airbag 20A shown in FIGS. 6A, 6B, and 6C, one of the vehicle inner side wall portions 22a and 22b in the gas inflow portion 22 of the base fabric 21 as the airbag body, for example, the vehicle outer wall portion 22b Only the vent hole 28 may be formed. In the airbag 20 </ b> A, when the coating agent 38 is applied to the outer surface side of the base fabric 21, the vent hole 28 is simply formed on the portion 22 c of the wall portion 22 a facing the vent hole 28 on the inner peripheral surface side of the base fabric 21. When the coating agent 38 is applied to the outer surface side of the base fabric 21 including the opening portion of the vent hole 28 in a state where the peripheral edge 28a is in contact with the outer periphery 28a, the coating agent 38 can be manufactured. Even in the airbag 20A, when the airbag 20A is inflated, the airbag 20A is inflated and inflated until the internal pressure of the airbag 20A rises to a predetermined value or more, and the occupant interferes with the airbag 20A. If it rises above a predetermined value, the adhesion of the peripheral edge 28a of the vent hole 28 is peeled off, and the vent hole 28 is opened, as shown in FIG. Is exhausted, and an increase in the internal pressure of the airbag 20A can be prevented.

  Further, the vent holes may be formed as vent holes 28A and 29A of the airbag 20B shown in FIG. In the airbag 20B, the vent holes 28A and 29A do not interweave the warp VS and the weft HS of the bag weave as in the general portion 27, but simply replace one of the warp VS or the weft HS with the other yarn. It is formed only on HS / VS. Even in such an airbag 20B, when the coating agent 38 is applied to the outer surface side of the base fabric 21, the vent 20A and 29A on the inner peripheral surface side of the base fabric 21 are simply vented to the portions facing the vent holes 28A and 29A. With the peripheral edges of the holes 28A and 29A in contact with each other (in the illustrated example, the peripheral edges of the vent holes 28A and 29A are in contact with each other), the vent hole 28A If the coating agent 38 is applied including the portion 29A, it can be easily manufactured.

  In the airbag 20B, when the inflation gas is introduced and inflated, the peripheral edges of the vent holes 28A and 29A are adhered by the coating agent 38, and the internal pressure of the airbag 20B rises to a predetermined value or more. If the airbag 20B is deployed and inflated, and the internal pressure of the airbag 20B rises above a predetermined value, such as when an occupant interferes with the airbag, the peripheral edges of the vent holes 28A and 29A are peeled off. The vent holes 28A and 29A are opened so that the gas G can be leaked from between the yarns VS and HS while breaking the coating agent 38, and the excess inflation gas G is exhausted from the opened vent holes 28A and 29A. In addition, it is possible to prevent an increase in the internal pressure of the airbag 20B that exceeds a predetermined value. In addition, although the case where the vent holes 28A and 29A are formed in both the wall portions 22a and 22b is shown in the illustrated example, the yarns VS and HS at the time of bag weaving are woven into only one of the wall portions 22a and 22b. You may arrange | position the vent hole formed without.

  Further, the position at which the vent hole is disposed is an internal pressure value until the air bag 20C opens the vent hole 28B by disposing it at the downstream portion of the inflation gas G as in the air bag 20C shown in FIG. Below, you may set so that the whole expansion | deployment can be completed reliably. In the airbag 20C, the lower end 34a of the thickness regulating portion 34A is extended to the vicinity of the lower edge 20b side of the airbag 20C, and the vertical cell portion 25ab surrounded by the thickness regulating portion 34A and narrowing the gas inlet 25b. A vent hole 28B is disposed in the region. In such an airbag 20C, the vertical cell portion 25ab becomes a downstream portion of the gas G compared to the other vertical cell portions 25a and 26a, and when the vent hole 28B is opened, the airbag 20C The entire deployment can be completed reliably.

  The present invention is an airbag for applying a coating agent for preventing gas leakage to the outer surface side of the base fabric, for protecting the head, protecting the pedestrian, the abdomen of the occupant seated on the seat, It can be applied to a side airbag that protects the chest, and is not limited to one manufactured by bag weaving, but can also be applied to a sewing airbag.

It is a schematic front view which shows the vehicle mounting state of the head protection airbag apparatus in which the airbag of one Embodiment of this invention is used. It is a front view of the airbag of an embodiment. FIG. 3 is a partial cross-sectional view of the airbag according to the embodiment when the airbag is inflated, and corresponds to a III-III portion of FIG. It is a fragmentary longitudinal cross-sectional view of the airbag of embodiment, and shows the state which the IV-IV site | part of FIG. 2 expand | swells. It is a schematic longitudinal cross-sectional view of the VV site | part of FIG. It is a fragmentary longitudinal cross-sectional view of the airbag of other embodiment, and shows the state which expand | swells. It is a figure which shows the airbag of other embodiment. It is a front view of the airbag of other embodiment.

Explanation of symbols

20, 20A, 20B, 20C ... airbags,
21 ... Base fabric / airbag body,
22c ... opposite part,
28 ・ 28A ・ 28B ・ 29 ・ 29A… Benthole,
28a, 29a ... Bent hole periphery,
38 ... coating agent,
G ... expansion gas,
W1 / W2 ... side window,
V ... Vehicle,
M: Head protection airbag device.

Claims (3)

An air bag provided with a vent hole that is opened when the internal pressure rises above a predetermined value and can exhaust the inflation gas,
A coating agent for preventing gas leakage is applied to the outer peripheral surface side of the base fabric of the airbag,
The air is characterized in that a peripheral edge of the vent hole is adhered to a portion facing the vent hole on the inner peripheral surface side of the base fabric so that the coating agent can be opened and closes the vent hole. bag. An air bag provided with a vent hole that is opened when the internal pressure rises above a predetermined value and can exhaust the inflation gas,
Two vent holes are disposed at opposing portions of the base fabric of the airbag,
A coating agent for preventing gas leakage is applied to the outer peripheral surface side of the base fabric of the airbag,
The airbag characterized in that the peripheral edges of the two opposing vent holes on the inner peripheral surface side of the base fabric are adhered to each other so that the coating agent can be opened and close the vent hole . 3. The airbag according to claim 1, wherein the base fabric is formed by bag weaving and is used for protecting the head that is folded and stored on the upper edge side of the side window of the vehicle.

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