JP2019010991A - Airbag device - Google Patents

Abstract

To provide an airbag device configured so that spaces of sewing margins of panel parts to be arranged at a connection port of an airbag can be reduced.SOLUTION: An airbag 30 of an airbag device comprises a connection port part 33 through which gas G for inflation from an inflator 20 connected thereto is flown out to an inflation site. In the connection port part are arranged an outer panel part 70 and an inner panel part 51 to be arranged at an inner periphery side of the outer panel part. The inner panel part is formed by folding in two an inner sheet 55 forming the inner panel part and sewing overlapped peripheral edges 55b with each other. In the outer panel part, an outer sheet 74 forming the outer panel part is arranged to wrap the inner panel part and is sewn with the inner sheet and then arranged. The outer sheet is sewn with the inner sheet, in a state where sewing margins 67 of respective sewn parts 66 of the overlapped peripheral edges of the inner sheet folded in two are overlappingly pressed against one side 58 of the overlapped peripheral edges of the inner sheet across a sewn site.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an airbag device equipped with an airbag that is mounted on a vehicle and inflates by inflating an inflation gas from an inflator.

  Conventionally, an airbag of an airbag device is configured to include an airbag that is inflated by an inflation gas and an inflator that supplies the inflation gas (see, for example, Patent Document 1). The airbag includes an inflatable portion that inflates when inflating gas flows in, and a cylindrical connection port that is connected to the inflator by inserting the inflator and flows out the inflating gas from the inflator to the inflatable portion. It had been. In order to increase heat resistance, the connection port part is provided with an outer panel part arranged on the outer peripheral side, an inner panel part arranged on the inner peripheral side of the outer panel part, etc., and the expansion gas is expanded. A cylindrical laminated part that can be supplied to the part side was disposed. Furthermore, as the shape of the connection port portion, a shape including a horizontal cylinder portion arranged on the insertion opening side into which the inflator is inserted and a vertical cylinder portion continuous from the horizontal cylinder portion to the expansion site side is provided. And the outer side panel part sewn the outer periphery of the front side sheet | seat and back side sheet | seat arrange | positioned on the outer surface side of a connection port part, and formed the horizontal cylinder part and the vertical cylinder part. The inner panel portion was configured from the upper side of a three-pronged pipe-like inner tube that guides the inflation gas into the inflation site. The inner tube includes a conduit portion extending in a cylindrical shape along the front-rear direction on the upper edge side of the expansion portion, a vertical inner cylindrical portion on the inner peripheral side of the vertical tube portion so as to extend upward from the vicinity of the center in the front-rear direction of the conduit portion, and The horizontal inner cylinder part on the inner peripheral side of the horizontal cylinder part is arranged. The tube sheet forming the inner tube is configured by providing symmetrical portions on both sides with the lower edge side of the conduit portion as the center. Therefore, the tube sheet is folded in two at the center of the tube sheet and stacked. Peripheral edges, i.e., the upper edge side of the conduit portion, the longitudinal inner cylindrical portion and the lateral inner cylindrical portion from the front edge side to the upper edge side, and the longitudinal inner cylindrical portion and the lateral inner cylindrical portion from the rear edge side to the lower edge side, And an inner tube was formed.

  And in this connection port part, the outer side panel part and the inner side panel part of the upper side of an inner tube were comprised and co-sewn.

Japanese Patent Laying-Open No. 2006-188066 (see FIGS. 3 to 6 and FIGS. 24 to 26 and 28)

  However, in the conventional airbag device, the connection port portion is sewed together with the outer panel portion and the inner panel portion, and the seam allowance protrudes in the shape of a collar and becomes bulky. In particular, since the seam allowance from the front edge of the vertical tube portion to the upper edge of the horizontal tube portion protrudes in a hook shape on the outer side of the air bag, there is a seam allowance storage area around the air bag storage area. Therefore, there is a problem of reducing the space for the seam allowance.

  The present invention solves the above-described problems, and an object of the present invention is to provide an airbag device that can reduce the space of the seam allowance of the panel portion disposed in the connection port portion of the airbag.

An airbag device according to the present invention includes an airbag that is inflated by an inflation gas, and an inflator that supplies the inflation gas.
An inflatable portion in which the airbag is inflated by inflating an inflating gas; and a connection port portion that is connected to the inflator by inserting the inflator and flows out the inflating gas from the inflator to the inflatable portion. Configured with
In the connection port,
A cylindrical laminated portion that is configured to include an outer panel portion and an inner panel portion that is disposed on the inner peripheral side of the outer panel portion and is capable of supplying an expansion gas to the expansion portion side,
An airbag device configured to be disposed,
The inner panel portion in the airbag is formed by folding the inner sheet forming the inner panel portion in half and stitching the overlapping peripheral edges together,
The outer panel portion is arranged so that the outer sheet forming the outer panel portion is disposed so as to wrap the inner panel portion and is sewn with the inner sheet, and
The outer sheet of the outer panel portion is
The inner sheet and the inner sheet as the state where the seam allowance of the stitched portions of the inner peripheral sheets that are folded in half is pressed against one side of the stacked peripheral edges of the inner sheet with the stitched sites in between. It is characterized by being stitched.

  In the airbag of the airbag device according to the present invention, as a configuration of the laminated portion of the connection port portion, the inner sheet constituting the inner panel portion is folded in half and stitched together at the peripheral edges to generate a seam allowance. Even so, the seam allowance is pushed by the outer sheet of the outer panel portion covering the inner panel portion so as to fall down on the outer peripheral surface side (outer surface) of the inner sheet in the vicinity of the stitched portion, and outward in a hook shape. Since there is no longer a protruding state, the seam allowance can be made compact. The state of being pressed against the inner sheet so that the seam allowance is collapsed is maintained because the outer sheet is sewn to the inner sheet with the seam allowance being lowered.

  Therefore, in the airbag device according to the present invention, it is possible to reduce the space for the seam allowance of the panel portion disposed in the connection port portion of the airbag.

In the airbag device according to the present invention, the outer sheet of the airbag is
The outer sheet is folded in half on the surface side on one side of the overlapped periphery of the inner sheet folded in two, and is sewn together at the stitching site,
The inner sheet is inverted such that the side of the outer sheet that is folded in two and separated from the inner sheet is reversed so that the seam allowance of the stitched portion is superimposed on one side of the outer sheet that overlaps the inner sheet. It is desirable to be stitched together.

  In such a configuration, the inner sheet and the outer sheet are sewn together, and the sheet portion of the outer sheet extending from the stitching portion is reversed with the stitching portion as the rotation center, and the outer peripheral surface side (outer surface) of the inner panel portion is reversed. ) And a stitched portion to a predetermined portion of the inner panel portion, a laminated portion composed of the inner panel portion and the outer panel portion having a compact seam allowance can be easily formed.

In the airbag device according to the present invention, the inner panel portion of the airbag is
An opening-side cylindrical portion close to the insertion opening side for inserting the inflator in the connection port portion;
An expansion side tubular portion that is bent and extends from the opening side tubular portion and extends toward the expansion portion;
And configured with
A fold portion for folding the inner sheet in half is disposed in the opening-side tubular portion, and a suture portion for folding the inner sheet in half and stitching the peripheral edges together is disposed in the expansion-side tubular portion. Configured
The outer panel portion is
A front-side cylindrical portion that covers the opening-side cylindrical portion of the inner panel portion;
An original tubular portion that is bent and extends from the distal tubular portion and covers the expansion tubular portion of the inner panel portion;
And configured with
A fold portion for folding the outer sheet in half is disposed in the front tubular portion, and a stitch portion for folding the outer sheet in half and stitching the peripheral edges together is disposed in the original tubular portion. It is desirable to be configured.

  In such a configuration, the opening side tubular portion of the inner panel portion close to the insertion opening side of the connection port portion and the front side tubular portion of the outer panel portion are not the stitched portion of the inner sheet or the outer sheet, but the sewing thread. Since it can be configured by arranging a crease part without passing seam, it is configured with heat resistance, even if it is arranged near the direct injection area of the inflation gas near the inflator, without any trouble, An inflation gas can be flowed. Furthermore, in such a laminated part, since the expansion side cylindrical part and the original side cylindrical part are arranged by being bent from the opening side cylindrical part and the front side cylindrical part, the insertion of the connection port part is performed. It is possible to suitably form a connection port portion configured to bend from the opening side and discharge the expansion gas toward the expansion site.

  In the airbag device according to the present invention, the outer panel portion of the airbag may be disposed on an inner peripheral side of a peripheral wall portion constituting an outer peripheral wall of the connection port portion in the airbag. The outer peripheral wall of the connection port portion in the airbag may be disposed.

It is the front view seen from the vehicle inner side of the vehicle carrying the airbag device for head protection of one embodiment concerning the present invention. It is an enlarged front view near the connection port of the airbag of the embodiment. It is a schematic longitudinal cross-sectional view of the airbag of the state which connected the inflator, and respond | corresponds to the III-III site | part of FIG. FIG. 4 is a schematic cross-sectional view of an airbag with an inflator connected thereto, corresponding to the IV-IV part in FIG. 2. It is a front view of the airbag of an embodiment. It is a front view which shows the structural member of the airbag of embodiment. It is a figure explaining the process of forming the inner side panel part and outer side panel part which are used for the airbag of embodiment. It is a figure explaining the process of sewing together and reversing the inner side sheet | seat of the inner side panel part and the outer side sheet | seat of an outer side panel part of embodiment. It is sectional drawing explaining the process of co-sewing and reversing the inner sheet | seat of the inner side panel part of the embodiment, and the outer side sheet | seat of an outer side panel part. It is a figure explaining the process of manufacturing the airbag of an embodiment. It is a front view which shows the airbag of the modification of embodiment. It is a front view which shows the structural member of the airbag shown in FIG. It is a figure explaining the manufacturing process of the airbag shown in FIG. It is a figure explaining the manufacturing process of the airbag shown in FIG. 11, and shows the process after FIG. It is a front view which shows the connection port part vicinity of the airbag of another modification. It is a front view which shows the inner tube used for the airbag shown in FIG. It is a schematic sectional drawing of the XVIIA-XVIIA site | part shown in FIG. 16, XVIIB-XVIIB site | part, and XVIIC-XVIIC site | part. It is a figure which shows the state which folds the inner sheet | seat of the inner side panel part of the airbag shown in FIG. It is a figure which shows the state which sets an inner side panel part to the outer side sheet | seat of the outer side panel part of the airbag shown in FIG. It is a figure explaining the state which forms the inner tube of the airbag shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The airbag device of the embodiment is a head protection airbag device S as shown in FIG. (Hereinafter also referred to as an airbag) 30, an inflator 20 that discharges inflation gas, an airbag cover 11, and mounting brackets 13 and 24. The airbag 30 is arranged from the lower edge side of the front pillar portion FP on the upper edge WU side of the windows (side windows) W1 and W2 arranged side by side on the side of the front seat and the rear seat inside the vehicle V. It is folded and stored in a range from above the intermediate pillar portion CP to above the rear pillar portion RP.

  As shown in FIGS. 2 to 4, the inflator 20 is inserted into an opening-side cylinder portion 34 of a connection port portion 33 to be described later for allowing the inflation gas G to flow in the airbag 30 as a substantially cylindrical cylinder type. The air bag 30 is connected. The inflator 20 includes a chemical that ignites and generates an expansion gas G, an ignition device, and the like, and has a cylindrical main body 21 and a small-diameter cylindrical gas discharge provided at the tip of the main body 21. And a portion 22. The gas discharge part 22 is provided with a plurality of gas discharge ports 22a, and the inflator 20 discharges the inflation gas G from these gas discharge ports 22a during operation.

  In the inflator 20, a mounting bracket 24 is attached to the base portion side of the outer peripheral surface 21 a of the main body portion 21 so as to sandwich the main body portion 21 (see FIGS. 1 and 2), and the mounting bracket 24 is fastened with a bolt 26. The roof head lining 5 is covered and attached and fixed to the inner panel 2 of the roof side rail portion RR near the upper portion of the intermediate pillar portion CP (see FIG. 1). Moreover, the inflator 20 is inserted into the opening side cylinder part 34 of the connection port part 33 from the front end side 20a including the gas discharge part 22, and the inflator 20 is connected to the opening side cylinder part 34 by a clamp 28 as connection means. It presses so that it may be pinched | interposed to the side, and is connected to the opening side cylinder part 34. FIG.

  The inflator 20 is operated by a predetermined control device that detects a side collision of the vehicle V or an oblique collision including an offset collision.

  As shown in FIG. 1, each mounting bracket 13 attaches and fixes a mounting portion 47 (described later) of the airbag 30 to the inner panel 2 by mounting bolts 14. Each mounting bolt 14 is fastened to a screw hole provided with a nut or the like in the inner panel 2.

  As shown in FIG. 1, the airbag cover 11 includes a lower edge 4a side of the front pillar garnish 4 disposed on the front pillar portion FP and a lower edge 5a side of the roof head lining 5 disposed on the roof side rail portion RR. And is composed of.

  As shown in FIGS. 1 and 5, the airbag 30 includes a bag body 31 formed by bag weaving, and an inner tube 50 disposed in a connection port portion 33 described later of the bag body 31. The bag main body 31 has a shield inflating portion 32 that inflates so as to cover the windows W1 and W2, and a connection port portion that communicates with the shield inflating portion 32 and allows the inflation gas from the inflator 20 to flow into the shield inflating portion 32 side. 33. The shield inflating portion 32 is a communication that connects the front inflating portion 32a covering the window W1, the rear inflating portion 32b covering the window W2, and the upper edge 30a of the airbag 30 with the front inflating portion 32a and the rear inflating portion 32b. The unit 32c is provided. 2 to 4, the connection port portion 33 includes an expansion side cylindrical portion 36 that communicates with the upper edge side in the vicinity of the center in the front-rear direction of the communication portion 32 c of the shield expansion portion 32, and an upper end of the expansion side cylindrical portion 36. And an opening-side cylinder portion 34 that extends rearward and inserts the distal end side 20a of the inflator 20. An insertion opening 35 into which the inflator 20 is inserted is opened at the rear end of the opening-side cylinder portion 34.

  A plurality (five in the embodiment) of attachment portions 47 for attaching the airbag 30 to the peripheral edges of the windows W1 and W2 are disposed on the upper edge 30a side and the front edge 30b side of the airbag 30. Each mounting portion 47 is formed with a mounting hole 47a through which the mounting bolt 14 is inserted. As described above, the mounting bracket 13 for mounting on the inner panel 2 on the body 1 side is fixed. Then, the mounting bolts 14 inserted through the mounting holes 47 a are fastened to the screw holes of the inner panel 2, so that the mounting portions 47 are fixed to the inner panel 2.

  In the case of the embodiment, as shown in FIG. 6, the airbag 30 includes a bag body 31 and an inner panel portion 51 of the inner tube 50 disposed in the connection port portion 33 of the bag body 31 as components. And inner and outer sheets 55 and 74 constituting the outer panel portion 70. The bag body 31 is formed by bag weaving using a woven yarn such as polyamide, including the outer peripheral wall 33 a of the connection port 33. For this reason, the bag body 31 of the airbag 30 is configured to be inflated so that the vehicle interior wall 38 and the vehicle exterior wall 39 through which the inflation gas flows are separated from each other. A closing portion 40 in which the vehicle inner side wall portion 38 and the vehicle outer side wall portion 39 are coupled to each other is disposed below the outer peripheral edge of the bag body 31 and the communication portion 32c.

  As shown in FIGS. 2 to 6, an inner tube as a laminated portion formed by laminating sheets 55 and 74 so as to improve the heat resistance of the connection port portion 33 in the connection port portion 33 of the bag body 31. 50 is arranged. The inner tube 50 includes an outer panel portion 70 on the outer peripheral side and an inner panel portion 51 disposed on the inner peripheral side of the outer panel portion 70. The sheets 55 and 74 are made of a flexible woven fabric such as polyamide or polyester.

  As shown in FIG. 7, the inner panel portion 51 is formed by folding the inner sheet 55 forming the inner panel portion 51 in half and stitching the overlapped peripheral edges 55 a and 55 b with a suture thread 85. ing. As shown in FIGS. 2 to 5 and 8, the inner panel portion 51 is bent and has an opening-side tubular portion 52 that is close to the insertion opening 35 side into which the inflator 20 is inserted in the connection port portion 33, and is bent and opened. And an expansion side tubular portion 53 extending from the portion 52 and extending toward the shield expansion portion 32 as an expansion portion. The opening side tubular portion 52 is disposed in the opening side tubular portion 34 of the connection port portion 33, and the expansion side tubular portion 53 is disposed in the expansion side tubular portion 36 of the connection port portion 33.

  Then, a fold portion 56 for folding the inner sheet 55 in two is disposed on the upper edge 52a side of the opening-side cylindrical portion 52, and the inner sheet 55 is folded in two between the peripheral edges 55a and 55b. The stitched portions 66 of the peripheral edges 55b extending from the eyes 56 are arranged on the front edge 53a side of the expansion side tubular portion 53.

  In the case of the embodiment, the stitched portion 66 is pressed against the outer surface (outer peripheral surface, vehicle outer surface) 58a of the opening outer portion 58 of the inner sheet 55 by the original outer portion 79 of the outer sheet 74, which will be described later, 33 (see FIG. 4).

  In addition, the stitching | suture site | part 64 of the periphery 55a mutual is arrange | positioned from the lower edge 52b side of the opening side cylindrical part 52 to the rear edge 53b side of the expansion side cylindrical part 53. In the case of the embodiment, the lower edge 52b and the rear edge 53b are also sewn together in the stitching portion 81 at the time of stitching between the peripheral edges 74a of the outer sheet 74 described later.

  As shown in FIG. 7, the inner sheet 55 has an opening inner portion 57 and an opening outer portion that form the opening-side tubular portion 52 symmetrically on both sides around the fold 56 in the state of being flattened. 58, and an expansion inner portion 59 and an expansion outer portion 60 that form the expansion side tubular portion 53 are disposed in a row. The vicinity of the front end 56a of the fold 56 is an area of the opening inner part 57 and the opening outer part 58 constituting the opening-side cylindrical part 52, but a lower area away from the fold 56 on the peripheral edge (front edge) 55b side. Are the areas of the expansion inner part 59 and the expansion outer part 60 that constitute the expansion side tubular part 53.

  Further, a folded portion 61 that protrudes from the insertion opening 35 and is folded back to the opening inner portion 57 and the opening outer portion 58 of the inner sheet 55 and welded to the outer peripheral wall 33 a of the opening-side cylinder portion 34 of the connection port portion 33. (See FIGS. 4 and 10B and C). The inner tube 50 is attached to the connection port portion 33 of the bag 30 woven by providing the welded portion 62 in the folded portion 61. These folded portions 61 are used as grip portions when the inflator 20 is inserted into the insertion opening 35, or when the insertion opening 35 is expanded, or the outer peripheral wall 33a and the outer sheet of the connection port portion 33 are used. 74, or between the inner sheet 55 and the outer sheet 74, and the leading end side 20a of the inflator 20 is prevented from being erroneously inserted between them.

  As shown in FIGS. 7 and 8, the outer panel portion 70 is disposed by arranging an outer sheet 74 forming the outer panel portion 70 so as to wrap the inner panel portion 51 and stitching it with the inner sheet 55. ing. 2-5, the outer side panel part 70 is bent from the front side cylindrical part 71 which covers the outer peripheral side of the opening side cylindrical part 52 of the inner side panel part 51, and the front side cylindrical part 71. And a former-side tubular portion 72 that extends and covers the outer peripheral side of the expansion-side tubular portion 53 of the inner panel portion 51. The front-side tubular portion 71 is disposed so as to contact the inner peripheral surface of the opening-side tubular portion 34 of the connection port portion 33, and the original-side tubular portion 72 is disposed inside the expansion-side tubular portion 36 of the connection port portion 33. It arrange | positions so that a surrounding surface may be contact | connected.

  And the outer panel part 70 also has the crease | fold part 75 which folds the outer sheet | seat 74 in two at the upper edge 71a of the front side cylindrical part 71, and the outer periphery 74a, 74b which folded the outer sheet | seat 74 in two and overlapped Among them, a sewing site 66 for sewing the peripheral edges 74b extending from the fold 75 is disposed on the front edge 72a of the original cylindrical portion 72.

  It should be noted that the stitches 81 between the peripheral edges 74 a are arranged from the lower edge 71 b side of the front cylindrical portion 71 to the rear edge 72 b side of the original cylindrical portion 72.

  The manufacturing process of the airbag 30 according to the embodiment will be described. First, as shown in FIGS. 7A and 7B, the inner sheet 55 is folded in two with a fold 56, and the opening outer portion 58 and the opening inner portion 57 are folded. Are formed to form the outer shape of the opening-side cylindrical portion 52, and the outer shape of the expansion-side cylindrical portion 53 is formed by overlapping the expansion outer portion 60 and the expansion inner portion 59 to overlap each other. That is, the lower edge 52 b of the opening-side tubular portion 52 and the rear edge 53 b of the expansion-side tubular portion 53 are stitched together with the suture thread 85 to form the stitched portion 64.

  Further, as shown in FIGS. 7A and 7B, the outer sheet 74 is folded in two with a fold 75, and the inner sheet 55 is folded in two as shown in FIG. The opening inner portion 57 and the inflated inner portion 59 are in contact with the front inner portion 76 and the original inner portion 78 of the outer panel portion 70 in which the outer sheet 74 is folded in half, and the inner panel portion 51 is placed on the outer panel portion 70. The front edge 53a of the expansion side tubular portion 53 of the inner panel portion 51 and the front edge 72a of the former side tubular portion 72 of the outer panel portion 70 are stitched together using a suture thread 85, and sutured. A portion 66 is provided. At this time, on the front side of the stitching portion 66, seams 67 and 68 between the front edge 53a of the expansion-side tubular portion 53 and the front edge 72a of the original-side tubular portion 72 of the outer panel portion 70 are hook-like. , Projecting forward. As shown in FIG. 9A, the seam allowance 67 is formed by overlapping two peripheral portions of the inflated inner portion 59 and the inflated outer portion 60 of the inner sheet 55, and the seam allowance 68 is also the outer sheet 74. The former inner part 78 and the former outer part 79 are overlapped at the peripheral portion.

  Thereafter, as shown in FIGS. 8B and 8C, the original outer portion 79 and the front outer portion 77 of the outer sheet 74 are reversed with the stitching portion 66 as the center during rotation, so that the inflated outer portion of the inner sheet 55 is expanded. 60 and the opening outer portion 58 are arranged on the outer peripheral side. At this time, as shown in FIGS. 9A and 9B, the outer side surface 79 of the inflated outer portion 60 of the inner sheet 55, while the former outer portion 79 of the outer sheet 74 also reverses the stitch margins 67 and 68. It will be in a state to press. At this time, the fold 56 of the inner sheet 55 is covered with the inverted fold 75 of the outer sheet 74, and the front outer portion 77 of the outer sheet 74 is disposed on the outer surface 58 a of the opening outer portion 58 of the inner sheet 55. As a result, the outer shape of the outer panel 70 is completed (see FIG. 4). Next, at the lower edge 71b of the front side tubular part 71 of the outer panel part 70 and the rear edge 72b of the former side tubular part 72, the peripheral edge 74a of the outer sheet 74 is connected to the edges 52b and 53b of the inner panel part 51. If the stitching part 81 is provided by using the suture thread 85 while being sewn together, the inner panel part 51 and the outer panel part 70 can be formed, and the inner tube 50 in which both are assembled can be formed.

  Thereafter, as shown in FIGS. 10A and 10B, the inner tube 50 is inserted into the connection port portion 33 of the bag body 31 through the insertion opening 35, the folded portions 61 and 61 are folded back, and the connection port portion If the welding part 62 is provided and welded to the outer peripheral wall 33a of 33, the airbag 30 can be manufactured.

  After the airbag 30 is manufactured, the airbag 30 is folded so that the lower edge 30c side approaches the upper edge 30a side, and a breakable tape (not shown) for preventing the collapse is wound and attached to the attachment portion 47. Attach the bracket 13, insert the tip side 20 a of the inflator 20 from the insertion opening 35 side of the connection port 33, and fasten the clamp 28 so as to press the outer periphery of the connection port 33 toward the inflator 20. If the inflator 20 is connected to the connection port 33, the airbag assembly can be assembled.

  And the airbag assembly assembled as mentioned above arrange | positions each attachment part 47 which attached the attachment bracket 13 in the corresponding attachment site | part of the inner panel 2 by the side of the body 1, and is penetrated to each attachment hole 47a. The mounting bolt 14 is fastened to the screw hole, the mounting bracket 24 is fastened with the bolt 26, the inflator 20 is fixed to the inner panel 2, and is attached to the body 1, and then the inflator 20 is attached to a predetermined inflator. Head lead protection is achieved by connecting unillustrated lead wires extending from the control device for operation, attaching the front pillar garnish 4 and the roof head lining 5 to the body 1, and further attaching the intermediate pillar garnish 7 and the rear pillar garnish 8 to the body 1. The airbag device S can be mounted on the vehicle V.

  If the inflator 20 is activated after the head protection airbag device S is mounted on the vehicle V, the inflation gas G is discharged from the gas discharge port 22a of the gas discharge portion 22 of the inflator 20, and the airbag 30 is connected. If the air bag 30 flows through the inner tube 50 in the mouth portion 33 to the shield inflating portion 32 side, the air bag 30 pushes open the air bag cover 11, and the windows W1, W2 as shown by the two-dot chain line in FIG. Then, the intermediate pillar portion CP and the rear pillar portion RP are expanded and inflated so as to cover the inside of the vehicle.

  And in the head protection airbag apparatus S of embodiment, the inner sheet | seat 55 which comprises the inner side panel part 51 as the structure of the inner tube 50 as the lamination | stacking site | part of the airbag 30 is FIG. As shown in FIG. 9, even if the peripheral edges 55 b folded and overlapped are stitched together to generate a seam allowance 67, the seam allowance 67 is outside sheet 74 of the outer panel part 70 that covers the inner panel part 51. Accordingly, the seam 67 is pressed against the outer peripheral surface (outer surface) 60a (58a) side of the inner sheet 55 in the vicinity of the stitched portion 64 so as not to protrude outward in a hook shape. Can be configured. It should be noted that the state where the seam 67 is pushed down against the inner sheet 55 is the state in which the outer sheet 74 is sewn to the inner sheet 55 with the seam 67 in a state where the seam 67 is tilted, This is maintained because the portion 79 and the inflated outer portion 60 are not misaligned.

  In particular, the stitching portion 81 is opposite to the edge (front edge) 55b provided with the seam allowance 67 with the expansion gas flow path (each cylindrical portion 52, 53, 71, 72) in between. The panel portion (original outer side portion 79) in a state where the seam allowance 67 is tilted is provided on the edge (rear edge) 55a, and the state where the seam allowance 67 is reversed is preferably maintained.

  Therefore, in the airbag apparatus S of the embodiment, the space of the seam allowance 67 of the panel part (inner panel part) 51 disposed in the connection port part 33 of the airbag 30 can be reduced.

  In the embodiment, the space of the seam allowance 67 can be reduced, so that the inner tube 50 can be used even if the inner diameter dimension d0 (see A in FIG. 10) of the connection port portion 33 formed by bag weaving is limited. It is possible to ensure a large flow rate of the expansion gas G that passes through. That is, as viewed from the front of the inner tube 50, the protruding dimension P0 (see A in FIG. 9) that protrudes from the inner peripheral surface side of the inner panel portion 51 at the seam allowance 67 before being reversed is as shown in C of FIG. Furthermore, the expansion inner portion 59 and the original inner portion 78 are changed so as to have only a small thickness dimension P1. Therefore, since the protruding dimension P0 of the seam allowance 67 can be almost eliminated, even if the inner diameter dimension d0 of the connection port portion 33 where the inner tube 50 is provided is limited, as shown in FIG. The front edge 50a of the surface can be disposed close to the front edge 36a of the inner peripheral surface of the connection port 33, and the inner panel portion 51 through which the expansion gas flows in the inner tube 50 can be approached. Thus, it is possible to ensure a substantially large flow path diameter.

  In the embodiment, the outer sheet 74 of the outer panel portion 70 is folded in half on the outer sheet 74 on the one surface side (inflated inner portion 59 side) of the overlapping peripheral edge 55b of the folded inner sheet 55. 74b are overlapped with each other and are sewn together at the stitching portion 66, and the side of the outer sheet 74 that is separated from the inner sheet 55 of the peripheral edge 55b that is folded in two, that is, the original outer portion 79, is attached to the stitching portion 66. The seams 67 and 68 are reversed so as to overlap the opening outer side 58 on one side of the peripheral edge 55 b where the inner sheet 55 is overlapped, and are sewn to the inner sheet 54 by the stitching portion 81.

  Therefore, in the embodiment, the inner sheet 55 and the outer sheet 74 are sewed together, and the sheet portion (original outer portion) 79 of the outer sheet 74 extending from the stitched portion 66 is reversed with the stitched portion 66 as the rotation center. When the inner panel 51 is arranged on the outer peripheral surface side (outer surface 58a) and is sewn to a predetermined portion (edges 52b, 53b) of the inner panel 51, the inner panel 51 having a compact seam allowance 67, 68 is provided. A laminated portion (inner tube) 50 composed of the outer panel portion 70 can be easily formed.

  In the embodiment, the inner panel portion 51 is bent from the opening-side tubular portion 52 near the insertion opening 35 for inserting the inflator 20 in the connection port portion 33 and extends from the opening-side tubular portion 52. And an expansion side tubular portion 53 extending toward the shielding expansion portion 32 as an expansion portion, and a fold portion 56 that folds the inner sheet 55 in half is formed at the upper edge 52a of the opening side tubular portion 52. And a stitching portion 66 for folding the inner sheet 55 in half and stitching the peripheral edges 55b together is arranged on the front edge 53a of the expansion side tubular portion 53. Further, the outer side panel part 70 is a front side cylindrical part 71 that covers the opening side cylindrical part 52 of the inner side panel part 51, and the expansion side cylinder of the inner side panel part 51 that is bent and extends from the front side cylindrical part 71. And a fold portion 75 for folding the outer sheet 74 in two is disposed on the upper edge 71a of the front cylindrical portion 71, and A stitching portion 66 for folding the sheet 74 in half and stitching the peripheral edges 74b together is disposed on the front edge 72a of the original cylindrical portion 72.

  Therefore, in the embodiment, the opening side cylindrical portion 52 of the inner side panel portion 51 and the front side cylindrical portion 71 of the outer side panel portion 70 close to the insertion opening 35 side of the connection port portion 33 are the inner sheet 55 and the outer sheet 74. Since the fold portions 56 and 75 having no stitches through which the thread passes can be arranged instead of the suture portions, the heat-resistant fold portions 56 and 75 that are close to the inflator 20 are formed. Even if it is provided in the vicinity of the jet area, the expansion gas G can flow without any trouble. Furthermore, in such a laminated part 50, since the expansion side cylindrical part 53 and the original side cylindrical part 72 are arranged by being bent from the opening side cylindrical part 52 and the front side cylindrical part 71, A connection port portion having an opening side cylinder portion 34 and an expansion side cylinder portion 36 configured to bend from the insertion opening 35 side of the connection port portion 33 and discharge the expansion gas G toward the shield expansion portion 32 side of the expansion portion. 33 can be suitably formed.

  In the embodiment, the outer panel portion 70 of the inner tube 50 is a portion of the peripheral wall portion (the vehicle inner wall portion 38 or the vehicle outer wall portion 39) constituting the outer peripheral wall 33 a of the connection port portion 33 in the bag body 31 of the airbag 30. Although arranged on the inner peripheral side, the outer panel portion may be arranged so as to constitute the outer peripheral wall itself of the connection port portion of the airbag.

  That is, as shown in the airbag 30A shown in FIGS. 11 to 14, for example, the outer panel 70 itself of the inner tube 50 of the embodiment may form the outer peripheral wall 33a of the connection port portion 33A.

  In the airbag 30A, the portion of the shield inflating portion 32 of the embodiment is formed by a bag weaving portion 43 that is woven. As shown in FIG. 12, the structural member of the airbag 30A includes a bag weave portion 43, an attachment portion sheet 48 (F, S, B) that forms an attachment portion 47A (F, S, B), and an implementation. An inner sheet 55 and an outer sheet 74 that are the same as the embodiment are provided.

  The bag weaving portion 43 combines the gas inflow portion 44 that swells away from the vehicle interior side wall portion 38 and the vehicle exterior wall portion 39 when the inflation gas flows in, and the vehicle interior side wall portion 38 and the vehicle exterior wall portion 39. And a closing portion 45 formed as described above. The closing portion 45 enters the gas inflow portion 44 from the peripheral edge closing portion 45a into the inside of the peripheral edge closing portion 45a disposed at the peripheral edge of the gas inflow portion 44 and the gas inflow portion 44 separated from the peripheral edge closing portion 45a. And an extended closing portion 45d disposed in the housing. The gas inflow portion 44 configures the front expansion portion 32a, the rear expansion portion 32b, and the communication portion 32c of the shield expansion portion 32. Further, the bag weaving portion 43 includes an opening 46 on the upper edge side of the gas inflow portion 44 where the peripheral edge closing portion 45a is not disposed. Then, the outer inner wall 78 and the outer outer portion 79 of the outer sheet 74 constituting the outer peripheral wall 33a of the connection port portion 33A are stitched to the peripheral edge of the opening 46, and the outer peripheral wall 33a of the connection port portion 33A itself is sewn. Is formed.

  In the airbag 30A, as shown in FIGS. 13A and 13B, the lower edge 50b side of the inner tube 50 manufactured in advance is inserted into the opening 46 of the bag weave 43. Each attachment portion 47A (F, S, B) formed by bending a predetermined portion from the attachment portion sheet 48 (F, S, B) in advance is attached to the peripheral edge closing portion 45 of the bag weave portion 43. Keep it. Of course, after attaching the inner tube 50 to the bag weaving portion 45, the attachment portion 47 may be attached to the peripheral edge closing portion 45a.

  Next, as shown in FIG. 13B and FIG. 14A, the former inner portion 78 of the outer panel portion 70 is sewn to the inner side wall portion 38 of the bag weave portion 43 by providing a stitching portion 86A. The outer portion 79 is provided with a stitching portion 86B and stitched to the vehicle outer side wall portion 39, and the folded portion 61 is folded and welded to the front side tubular portion 71 of the outer panel portion 70. Next, as shown in FIGS. 14B and 14C, stitching portions 87 and 88 are provided so as to close the opening 46 of the bag weaving portion 43. The stitching portion 87 is provided so as to extend rearward from the upper front closing portion 45b on the front side of the opening 46 on the upper edge side of the peripheral closing portion 45a so as to reach the front edge side of the inner tube 50. And the stitching portion 88 is provided so as to extend forward from the upper rear closing portion 45c on the rear side of the opening 46 on the upper edge side of the peripheral closing portion 45a and reach the rear edge of the inner tube 50. is there.

  As described above, the airbag 30A can be manufactured by sewing the inner tube 50 around the periphery of the opening 46 and closing the opening 46.

  In this airbag 30A, as shown in FIG. 14C, at the front edge of the connection port portion 33A, as shown by a two-dot chain line, the seams 67 and 68 do not protrude in a hook shape on the front side. It is not necessary to consider the allowances 67 and 68 as the peripheral space of the connection port portion 33A mounted on the airbag 30A, which can contribute to reducing the storage space of the connection port portion 33A.

  In the embodiment, when the inner sheet seam is reversed so as to be pressed against the outer peripheral surface side (outer surface) of the inner sheet, the outer sheet is also sewn together at the stitched portion, and the outer sheet seam is also reversed. Although it was set as the structure, it is good also as a structure which reverses only the seam allowance of an inner side panel part with an outer side sheet | seat.

  For example, you may comprise like the airbag 30B shown to FIGS. This airbag 30B is configured by disposing an inner tube 50B in a connection port portion 33B of a bag-woven bag body 31B.

  The inner tube 50B is disposed so as to enter the communication part 32c of the shielding / expanding part 32 of the bag main body 31B from the connection port part 33B, and is arranged on the outer panel part 70B on the outer peripheral side and the inner peripheral side of the outer panel part 70B. And an inner panel portion 51B to be disposed.

  The inner panel portion 51B includes an opening-side tubular portion 52B on the insertion opening 35 side of the connection port portion 33B, and an expansion-side tubular portion 53B disposed on the shielding expansion portion 32 side. The expansion side tubular portion 53B has outlets 54F and 54B through which expansion gas can flow out on both the front and rear sides.

  As shown in FIGS. 18A and 18B, the inner sheet 55B forming the inner panel portion 51B is provided with a fold 56B on the lower edge 53c side of the expansion side tubular portion 53B, folded in half, and overlapped. As shown in FIGS. 20A and 20B, the rear edge 55d is overlapped (specifically, the rear edge side of the opening side cylindrical part 52B and the upper edge side of the expansion side cylindrical part 53B connected thereto) as shown in FIGS. Is configured to be sutured. The sewing on the rear edge 55d side is performed together with the outer panel portion 70B.

  And in this airbag 30B, the seam allowance 67 of the stitching | suture part 65 by the side of the front edge 55c is reversed using the outer side panel part 70A, and is made compact.

  As shown in FIGS. 16, 17, and 20, the outer panel portion 70B includes a front-side tubular portion 71B that covers the opening-side tubular portion 52B of the inner panel portion 51B, and an expansion-side tubular portion 53B of the inner panel portion 51B. Openings 73 (F, B) are provided on both front and rear sides as pipes extending in the front-rear direction so as to cover.

  As shown in FIGS. 19A and 19B and FIGS. 20A and 20B, the outer sheet 74B forming the outer panel portion 70B is folded in two with a fold 75B on the front edge 71c side of the front cylindrical portion 71B. Thus, the lower edge 74c and the rear edge 74d side of the overlapped peripheral edge are sewn. Note that the rear edge 74d side is specifically the rear edge side of the front cylindrical portion 71B and the upper edge side of the former cylindrical portion 72B that is continuous therewith. Then, the vicinity of the fold 75B presses the seam allowance 67 of the inner panel portion 51B against the outer surface 58a of the opening outer portion 58B, and stitches the rear edge 74d side together with the rear edge 55d side of the inner panel portion 51B side. A portion 81B is provided, and the outer panel portion 70B is stitched to the inner panel portion 51B.

  In the outer sheet 74B, the stacked lower edges 74c are also stitched together by the stitching portion 83 without being stitched to the inner sheet 55B.

  In addition, in the sheets 55B and 74B, components similar to those of the sheets 55 and 74 of the embodiment are denoted by B after the reference numerals, and description thereof is omitted.

  As shown in FIGS. 18A and 18B, the inner tube 50B is manufactured by folding the inner sheet 55B in two with a fold 56B, and providing a stitched portion 65 with a suture 85 on the front edge 55c side. To form the outer shape of the inner panel portion 51B. Then, with the inner panel portion 51B folded back at the seam allowance 67 of the stitched portion 65, as shown in FIGS. 19A and 19B, the front outer side portion 77B and the original outer side portion 79B of the outer sheet 74B that are flatly developed are shown. Put it on. Next, as shown in FIGS. 20A and 20B, the outer sheet 74B is folded in two with a fold 75B, the lower edges 74c of the overlapped peripheral edges are sewn together, and the rear edge 74d is connected to the inner panel. The inner tube 50B can be manufactured by providing the stitched portion 81B and stitching together with the portion 51B.

  Thereafter, the inner tube 50B is inserted into the connection port portion 33B of the bag body 31B through the insertion opening 35, the folded portions 61B and 61B are folded back, and the welded portion 62 is formed on the outer peripheral wall 33a of the connection port portion 33B. If provided and welded, the airbag 30B can be manufactured.

  Also in this airbag 30B, the seam allowance 67 is pressed down to the outer surface 58a side of the opening outer portion 58B by the outer panel portion 70B sewn to the inner panel portion 51B at the stitching portion 81B (A in FIG. 17). , B), and the expansion gas inner tube 50B is formed in a compact form without overhanging, even if the inner diameter of the connection port portion 33B formed by bag weaving is limited, as in the embodiment. It is possible to increase the substantial inner diameter dimension that passes through, and to secure a large flow rate of the expansion gas.

  In the embodiment, the inner tube 50 has a two-layer structure of the inner panel portion 51 and the outer panel portion 70. However, a reinforcing panel portion may be further provided on the inner peripheral side of the inner panel portion 51. Well, in that case, the inner panel part 51 is in a state of being overlapped, and the seam allowance 67 is formed to be thicker, but the outer panel part 70 reverses the portion of the thick seam allowance 67 to make it compact. Can be configured.

  Further, in the embodiment, the head protection airbag device S is exemplified, but the connection portion of the airbag protrudes from the inflated portion such as the shield inflating portion, and a laminated portion to be stitched to the connecting port portion is arranged. The present invention can be implemented as long as it has a merit of reducing the seam allowance. For example, the present invention may be applied to a pedestrian protection airbag, etc., instead of a curtain airbag. .

  DESCRIPTION OF SYMBOLS 20 ... Inflator 30, 30A, 30B ... (Curtain) airbag, 32 ... (Expansion part) Shielding expansion part, 33, 33A, 33B ... Connection port part, 33a ... Outer peripheral wall, 50, 50B ... (Lamination part) Inner Tube, 51, 51B ... inner panel part, 52, 52B ... opening side cylindrical part, 53, 53B ... expansion side cylindrical part, 55, 55B ... inner sheet, 55b, 55c ... peripheral edge, 56, 56B ... fold, 57,57B ... opening inner side, 58,58B ... opening outer side, 58a ... (vehicle outer side) outer side, 59,59B ... expanded inner side, 60,60B ... expanded outer side, 65 ... stitched site / stitched part, 66 ... (co-sewing) stitched part / stitched part, 67 ... (inner sheet) seam allowance, 68 ... (outer sheet) seam allowance, 70, 70B ... outer panel part, 71, 71B ... front cylindrical part, 72, 72B ... Former cylindrical part, 74 74B ... outer sheet, 74b ... (front suture site) peripheral edge, 74d ... (rear edge) peripheral edge, 75,75B ... fold, 76,76B ... front inner part, 77,77B ... front outer part, 78,78B ... original Inner part, 79, 79B ... (sheet part) former outer part, 81, 81B ... (to the inner sheet of the outer sheet) stitched part / stitched part, 85 ... suture thread, G ... inflation gas, S ... head protection Airbag device.

Claims (5)

An airbag that is inflated by the inflation gas and an inflator that supplies the inflation gas are configured, and
An inflatable portion in which the airbag is inflated by inflating an inflating gas; and a connection port portion that is connected to the inflator by inserting the inflator and flows out the inflating gas from the inflator to the inflatable portion. Configured with
In the connection port,
A cylindrical laminated portion that is configured to include an outer panel portion and an inner panel portion that is disposed on the inner peripheral side of the outer panel portion and is capable of supplying an expansion gas to the expansion portion side,
An airbag device configured to be disposed,
The inner panel portion in the airbag is formed by folding the inner sheet forming the inner panel portion in half and stitching the overlapping peripheral edges together,
The outer panel portion is arranged so that the outer sheet forming the outer panel portion is disposed so as to wrap the inner panel portion and is sewn with the inner sheet, and
The outer sheet of the outer panel portion is
The inner sheet and the inner sheet as the state where the seam allowance of the stitched portions of the inner peripheral sheets that are folded in half is pressed against one side of the stacked peripheral edges of the inner sheet with the stitched sites in between. An airbag device characterized by being stitched. The outer sheet of the airbag is
The outer sheet is folded in half on the surface side on one side of the overlapped periphery of the inner sheet folded in two, and is sewn together at the stitching site,
The inner sheet is inverted such that the side of the outer sheet that is folded in two and separated from the inner sheet is reversed so that the seam allowance of the stitched portion is superimposed on one side of the outer sheet that overlaps the inner sheet. The airbag device according to claim 1, wherein the airbag device is stitched together. The inner panel portion of the airbag is
An opening-side cylindrical portion close to the insertion opening side for inserting the inflator in the connection port portion;
An expansion side tubular portion that is bent and extends from the opening side tubular portion and extends toward the expansion portion;
And configured with
A fold portion for folding the inner sheet in half is disposed in the opening-side tubular portion, and a suture portion for folding the inner sheet in half and stitching the peripheral edges together is disposed in the expansion-side tubular portion. Configured
The outer panel portion is
A front-side cylindrical portion that covers the opening-side cylindrical portion of the inner panel portion;
An original tubular portion that is bent and extends from the distal tubular portion and covers the expansion tubular portion of the inner panel portion;
And configured with
A fold portion for folding the outer sheet in half is disposed in the front tubular portion, and a stitch portion for folding the outer sheet in half and stitching the peripheral edges together is disposed in the original tubular portion. The airbag device according to claim 2, wherein the airbag device is configured as described above.   The outer side panel part of the said airbag is arrange | positioned by the inner peripheral side of the surrounding wall site | part which comprises the outer peripheral wall of the said connection port part in the said airbag, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The airbag apparatus of Claim 1.   The said outer side panel part of the said airbag is arrange | positioned so that the outer peripheral wall of the said connection port part in the said airbag may be comprised, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Airbag device.

Images