JP2007045173A - Head protection air bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head protection air bag easily manufacturable with reduced man-hours and costs even when an inner tube is disposed on an inner peripheral side of a connection port to be connected to an inflator. <P>SOLUTION: This head protection air bag 19 is developed and expanded to cover a window from an storage portion on an upper edge of the window when gas G for expansion flows in. The air bag 19 comprises a tubular connection port 22 having an inserting opening 22a for connecting with an inflator supplying the gas for expansion. An inner tube 37 for improving heat resistance is disposed on an inner periphery of the connection port 22. The inner tube 37 is disposed in such a manner that an extension tube part 35 formed to extend from the connection port 22 is folded on a peripheral edge of the inserting opening 22a, and inserted in the connection port 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a head protection airbag that can inflate inflation gas from an upper edge side of a vehicle window (side window), expand and inflate downward so as to cover the window, and protect the head of an occupant. In particular, it has a cylindrical connection port with an insertion opening for connection to an inflator that supplies inflation gas, and an inner tube for improving heat resistance is provided on the inner periphery of the connection port The present invention relates to a head protection airbag configured as described above.

Conventionally, head protection airbags have been configured to include a cylindrical connection port portion having an insertion opening for connection to an inflator that supplies inflation gas. In addition, the head protection airbag is provided with an inner tube on the inner circumference side of the connection port to improve heat resistance in consideration of the high temperature of the inflation gas supplied from the inflator. (For example, refer to Patent Document 1).
JP-A-2003-327070

  However, although the conventional inner tube uses the remaining material of the base fabric for forming the airbag, it is cut into a predetermined shape and further formed into a cylindrical shape by sewing so that the inflation gas can be guided In addition, it is necessary to dispose in the connection port portion, which increases the man-hours and cost for manufacturing the head protection airbag.

  The present invention solves the above-described problems, and can be manufactured with reduced man-hours and costs easily even if an inner tube is disposed on the inner peripheral side of a connection port portion to be connected to an inflator. An object is to provide a head protection airbag.

The head protection airbag according to the present invention is inserted to expand and inflate so as to cover the window from the storage part on the upper edge side of the window and to connect to an inflator that supplies the inflation gas when the inflation gas flows in. Provided with a cylindrical connection port having an opening for
A head protection airbag configured by disposing an inner tube for improving heat resistance on the inner peripheral side of the connection port,
The inner tube is arranged such that an extension tube portion formed so as to extend from the connection port portion is folded back at the periphery of the insertion opening and inserted into the connection port portion.

  In the head protection airbag according to the present invention, the inner tube is not a separate body from the airbag, but is constituted by an extension cylinder portion that is formed to be extended from the insertion opening of the connection port portion. If the tube portion is folded back so as to be inserted into the inner peripheral side of the connection port portion, it can be disposed on the inner peripheral side of the connection port portion.

  Therefore, without cutting separately from the airbag, the inner tube can be disposed in the connection port portion by cutting the extension tube portion into a predetermined shape at the same time as the vicinity of the connection port portion and then folding it back. Further, since the inner tube arranged in the connection port portion and the folded connection port portion is continuously connected at the periphery of the insertion opening, the inner tube is connected to the connection port portion. Therefore, it is difficult to cause a positional shift such as coming out or entering from the connection port, and a separate work for firmly fixing the inner tube is not required.

  That is, as in the conventional case, separately for the inner tube, it is cut in an independent process, and then formed into a cylindrical shape. Further, the inner tube formed into a cylindrical shape is managed so as not to be inserted too much. Compared to the case where the inner tube is arranged in the connection port, the cutting management and man-hours are slightly increased, but the process of forming the inner tube in the subsequent cylindrical shape and the inner tube are arranged in the connection port. Since the process and management can be remarkably reduced, the manufacturing man-hours and manufacturing costs of the entire head protection airbag can be reduced. Furthermore, conventionally, after inserting the inner tube into the connection port portion, in order to prevent misalignment, an operation of fixing the inner tube to the connection port portion separately using thermal welding or the like was also performed. .

  Therefore, the head protection airbag according to the present invention can be manufactured with reduced man-hours and costs easily even if the inner tube is disposed on the inner peripheral side of the connection port portion connected to the inflator.

  In addition, as the head protection airbag, including the extension tube portion, it is manufactured as a bag weave type formed by bag weaving, or includes the extension tube portion, and the vehicle inner side and the vehicle outer side when the inflation is completed Can be manufactured as a joint type in which at least two base fabrics arranged in the above are joined together.

  Then, it is desirable to dispose a coating layer having heat resistance on the guide surface side of the expansion gas in the inner tube where the extension cylinder portion is folded back. The heat resistance of the part can be improved.

  Furthermore, slit-like openings that communicate between the inside and the outside are formed on the end surfaces of at least two edges of the peripheral edge away from the insertion opening in the extension cylinder part, and these slit-like openings are formed by folding the extension cylinder part. You may comprise so that the outflow port which can distribute | circulate the gas for inflation from an inflator to a different direction to the inner tube which was made to flow out in an airbag may be formed.

  If comprised in this way, the gas for expansion | swelling from an inflator can be distributed in a different direction, and can be made to flow out in an airbag from an outflow port, and the expansion | swelling of the predetermined several area of an airbag can be accelerated | stimulated. it can. In addition, the slit-shaped opening that forms the outflow port is formed on the end surface of the peripheral edge of the extended cylindrical portion, and when the extended cylindrical portion is cut or sewn without drilling. Since it can be formed easily, the outflow port for distributing the expansion gas can be easily formed in the inner tube without increasing the number of processing steps.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A head protection airbag device M in which a head protection airbag 19 according to a first embodiment is used includes an airbag 19 as shown in FIG. And an inflator 12, mounting brackets 10 and 13, and an airbag cover 8. The airbag 19 extends from the lower edge side of the front pillar portion FP to the upper side of the rear pillar portion RP from the lower edge side of the front pillar portion 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, 2, and 3, the inflator 12 is a substantially cylindrical cylinder type, and has a substantially circular head with a small-diameter substantially cylindrical head 12 b with a gas discharge port 12 c opened at the front end (tip). A columnar main body 12a and a substantially cylindrical diffuser 12d that covers the periphery of the front end (tip) of the main body 12a are provided. The diffuser 12d is fixed to the main body 12a by caulking the front end of the main body 12a so as to reduce the diameter. The inflator 12 is externally provided with a connection port portion 22 for allowing the inflation gas in the airbag 19 to flow into the front end side of the diffuser 12 d, and is connected to the airbag 19 using the clamp 15. . 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.

  As shown in FIGS. 2 and 3, the clamp 15 is a belt clamp type in which a belt-shaped sheet metal is wound in a single winding so as to form an outer peripheral portion 15a and an inner peripheral portion 15d. Then, the gripping portion 15c protruding to the periphery is pinched and plastically deformed so as to narrow the internal space, thereby engaging the locking projection 15e of the inner peripheral portion 15d and the peripheral edge of the locking hole 15b of the outer peripheral portion 15a. In combination, the inner diameter is narrowed. Then, when the holding portion 15c is pinched and the inner diameter of the clamp 15 is narrowed and maintained, the connection port portion 22 sheathed on the inflator 12 is connected to the inflator 12 with the inner tube 37 interposed therebetween. Become.

  Each mounting bracket 10 is composed of two sheet metal plates, and is attached to each mounting portion 30 so as to sandwich each mounting portion 30 of the airbag 19, and each mounting portion 30 is connected to the inner panel by mounting bolts 11. 2 is fixedly attached. Each mounting bolt 11 is fastened to a mounting hole formed by providing a nut (not shown) in the inner panel 2.

  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.

  The air bag 19 is manufactured by bag weaving using polyamide yarn or the like, as shown in FIGS. 1 to 7, inflated from the inflator 12, expanded from a folded state, and side window It expands and expands so as to cover the inner side of the pillar garnishes 7 and 6 of W1 and W2 and the center pillar part CP and the rear pillar part RP. The airbag 19 includes an airbag main body 20 that forms the outer surface side of the airbag 19 and an inner tube 37 that is disposed on the inner peripheral side of the connection port portion 22. Further, the airbag main body 20 includes a gas inflow portion 21 that inflates the inflating gas G so as to separate the vehicle inner side wall portion 21a and the vehicle outer side wall portion 21b, and a non-inflow portion 28 that does not allow the inflating gas G to flow in. , And is configured.

  The non-inflow portion 28 is formed so that the wall portions 21 a and 21 b of the gas inflow portion 21 are coupled to each other, and includes a peripheral edge portion 29, an attachment portion 30, partition portions 31 and 32, and a plate-like portion 33. ing. The peripheral edge portion 29 is disposed at the outer peripheral edge portion of the airbag 19 and is formed so as to surround the periphery of the gas inflow portion 21.

  A plurality of attachment portions 30 (six in the embodiment) are formed so as to protrude upward from the peripheral edge portion 29 on the upper edge 19 a side of the airbag 19. Each mounting portion 30 is formed with a mounting hole 30a through which the bolt 11 is inserted. As described above, the mounting bracket 10 for mounting to the inner panel 2 is fixed to each mounting portion 30, and the mounting bolt 11 inserted through each mounting hole 30 a is attached to a nut (not shown) of the inner panel 2. By being fastened, it is fixed to the inner panel 2.

  The plate-like portion 33 is formed in a rectangular plate shape below the gas supply path portion 23 between the front and rear protective expansion portions 25 and 26. The plate-like portion 33 is disposed in order to secure the overall shape of the airbag 19 and reduce the volume of the gas inflow portion 21 to shorten the time until completion of the inflation.

  The partition portions 31 and 32 are disposed in the regions of the front and rear protective expansion portions 25 and 26, respectively, and the partition portion 31 enters the protection expansion portions 25 and 26 from the lower edge side of the peripheral edge portion 29. In this way, the partition portion 32 is formed so as to extend from the upper front end of the plate-like portion 33 to the front lower side. When the expansion of the front and rear protective expansion sections 25 and 26 is completed, the partition sections 31 and 32 are connected to the front and rear small cells 25a, 25b, 25c, 25d, 26a, and the like. The protective expansion portions 25 and 26 are arranged to restrict the thickness of the protective expansion portions 25 and 26 so that the protective expansion portions 25 and 26 can be expanded in a substantially plate shape instead of being spherical.

  The cells 25a, 25b, 25c, 25d, 26a, and 26b partitioned by the partitioning portions 31 and 32 are shortened in the front-rear direction of the airbag 19 at the time of inflation, and the airbag 19 at the time of completion of inflation. It also serves to generate a longitudinal tension on the lower edge 19b side.

  In the embodiment, the gas inflow portion 21 includes a connection port portion 22, a gas supply path portion 23, and a protective expansion portion 24. The gas supply path 23 is arranged in a straight line along the front-rear direction of the vehicle V on the upper edge 19 a side of the airbag 19. A connection port portion 22 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 passage portion 23. The gas supply path portion 23 allows the inflation gas G from the connection port portion 22 to flow to both sides in the front-rear direction of the vehicle V, that is, to the upper side of the cell 25a on the front side and to the upper side of the cell 26b on the rear side. In the airbag 19, an upstream side portion that is inflated first is configured. The gas supply passage portion (upstream side portion) 23 is partially covered with the airbag cover 8 when the inflation is completed in a vehicle-mounted state, and the lower side is near the upper part of the occupant head. It is comprised so that it may be arrange | positioned to the side.

  The protective inflating part 24 is an area that protects the head of the occupant seated on the seat of the vehicle V together with the lower side of the gas supply path part 23, and is divided into front and rear parts by the plate-like part 33. 25 and a rear protective inflating portion 26. The front protective inflating portion 25 is disposed below the front portion of the gas supply passage 23, and is disposed on the side of the front seat of the vehicle V when the airbag 19 is deployed and inflated. It will expand so as to cover the side window W1. The rear protective inflating section 26 is disposed below the rear side of the gas supply passage section 23, and is disposed on the side of the rear seat of the vehicle V when the airbag 19 is deployed and inflated. Will be covered. Each of the protective inflating portions 25 and 26 is partitioned by the partitioning portions 31 and 32 that regulate the thickness as described above when the expansion is completed, and a plurality of cells 25a that are arranged in parallel in the front-rear direction of the vehicle V. It is configured to inflate 25b, 25c, 25d, 26a and 26b.

  The inner tube 37 is formed so as to be folded back from the periphery of the insertion opening 22 a of the connection port portion 22 of the airbag body 20 to the inner periphery side of the connection port portion 22. The inner tube 37 has two outlets 38 and 39 opened at the distal end side in the airbag body 20. The outflow port 38 is opened with an axial center along the front-rear direction so that the inflation gas G flowing into the inner tube 37 flows out to the front side along the gas supply path 23. Is opened with an obliquely rearward downward axis so that the inflation gas G flowing into the inner tube 37 flows out rearward along the gas supply path 23.

  The inner tube 37 is formed so that when the airbag main body 20 is woven, the extension cylinder 35 extending from the connection port 22 is connected to the vicinity of the connection port 22 as shown in FIG. At the same time, woven and formed. The extension cylinder portion 35 formed by weaving in the bag simultaneously with the vicinity of the connection port portion 22 is simultaneously cut when cutting the vicinity of the connection port portion 22, and at that time, slit-shaped openings 35 a and 35 b are formed at the periphery. Is formed. Then, the extension cylinder part 35 is folded back with the peripheral edge of the insertion opening 22a of the connection port part 22 as a crease C, and is inserted into the inner peripheral side of the connection port part 22, and the inner tube 37 is connected to the connection port part 22. It is arrange | positioned at the inner peripheral side. At that time, the slit-shaped opening 35 a constitutes the outflow port 38, and the slit-shaped opening 35 b constitutes the outflow port 39.

  A coating layer 41 made of silicon rubber or the like for improving heat resistance is disposed on the inner peripheral surface 37a side of the inner tube 37 into which the inflator 12 is inserted. In the case of the embodiment, the coating layer 41 is formed on the outer surface side in order to prevent gas leakage at the gas inflow portion 21 after the airbag body 20 is woven together with the connection port portion 22 and the extension tube portion 35. The coating layer 41 is provided in the whole area, and the coating layer 41 of the extension cylinder part 35 is disposed on the inner peripheral surface 37a side of the inner tube 37 by being folded and inserted into the connection port part 22. It becomes. The inner peripheral surface 37 a of the inner tube 37 constitutes a guide surface that guides the inflation gas G to the gas supply path 23 side of the airbag body 20.

  When the airbag 19 is mounted on a vehicle, first, a crease is formed along the substantially front-rear direction so that the lower edge 19b approaches the upper edge 19a, and folding is performed by bellows folding or the like. Then, a wrapping material for preventing breakage (not shown) that can be broken is wound. Next, the front end side of the inflator 12 to which the mounting bracket 13 has been attached is inserted into the inner peripheral surface 37 a side of the inner tube 37 through the insertion opening 22 a of the connection port portion 22, and is externally installed around the connection port portion 22. The grip 15c of the clamp 15 is caulked, and the inflator 12 and the connection port 22 of the airbag 19 are connected by the clamp 15. Moreover, the attachment bracket 10 is attached to each attachment portion 30 of the airbag 19 to form an airbag assembly. Thereafter, the brackets 10 and 13 are arranged at predetermined positions of the inner panel 2 on the body 1 side, and the bolts 11 and 14 are fixed by inserting the mounting holes 30a, and the brackets 10 and 13 are fixed to the inner panel 2. And fix the airbag assembly 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.

  If the inflator 12 is actuated after the airbag device M is mounted on the vehicle V, the inflation gas G from the inflator 12 passes through the connection port 22 in the airbag 19 as shown by a two-dot chain line in FIG. From the outlets 38 and 39 of the inner tube 37, the gas flows into the gas supply path (upstream part) 23, flows through the gas supply path 23 toward both sides in the front-rear direction, and further protects the front and rear of the airbag 19. Since it flows into the expansion parts 25 and 26, each protection expansion part 25 and 26 begins to expand, canceling | folding. The airbag 19 breaks the wrapped wrapping material (not shown), 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, and projects downward. On the other hand, as shown by a two-dot chain line in FIG. 1, the side window W1, W2, the center pillar portion CP, and the rear pillar portion RP are greatly expanded and inflated so as to cover the vehicle interior I.

  And in the head protection airbag 19 of 1st Embodiment, the inner tube 37 is formed so that it may extend from the insertion opening 22a of the connection port part 22 instead of the airbag main body 20 of the airbag 19 separately. If the extension cylinder part 35 is folded back so as to be inserted into the inner circumference side of the connection port part 22 as shown in FIG. 8, the inner circumference of the connection port part 22 is formed. Can be arranged on the side.

  Therefore, without cutting separately from the airbag body 20, the extension tube 35 is cut into a predetermined shape at the same time as the vicinity of the connection port 22, and the inner tube 37 is disposed in the connection port 22 by folding back. Can be made. Furthermore, since the inner tube 37 arranged in the connection port portion 22 and the folded connection port portion 22 is continuously connected at the periphery of the insertion opening 22 a, the inner tube 37 is connected to the connection port portion 22. Therefore, it is difficult to cause a positional shift that comes off or enters from the connection port portion 22, and a separate work for firmly fixing the inner tube 37 becomes unnecessary.

  That is, as in the conventional case, separately for the inner tube, it is cut in an independent process, and then formed into a cylindrical shape. Further, the inner tube formed into a cylindrical shape is managed so as not to be inserted too much. Compared with the case where it is arranged in the connection port, the cutting management and man-hours are slightly increased by 35 minutes for the extended cylinder part, but the process of forming the inner tube in the subsequent cylindrical shape, and the inner tube in the connection port part Since the process and management to arrange | position can be remarkably reduced, the manufacturing man-hour and manufacturing cost of the head protection airbag 19 whole can be reduced. Furthermore, conventionally, after inserting the inner tube into the connection port portion, in order to prevent misalignment, an operation of fixing the inner tube to the connection port portion separately using thermal welding or the like was also performed. .

  Therefore, in the head protection airbag 19 of the first embodiment, even if the inner tube 37 is disposed on the inner peripheral side of the connection port portion 22 to be connected to the inflator 12, the man-hour and cost are easily reduced. can do.

  Further, in the head protection airbag 19 of the first embodiment, the coating layer 41 having heat resistance is provided on the inner peripheral surface 37a serving as a guide surface for the inflation gas G in the inner tube 37 where the extension cylinder portion 35 is folded back. Further, the heat resistance of the connection port portion 22 is further improved, and gas leakage from the vicinity of the connection port portion 22 can be prevented.

  Further, in the first embodiment, slit-like openings 35a and 35b communicating between the inside and the outside are formed on the end faces 35d and 35e of at least two edges of the peripheral edge 35c apart from the insertion opening 22a in the extension cylinder part 35. These slit-shaped openings 35a and 35b distribute the inflation gas G from the inflator 12 to different sides in the front-rear direction to the inner tube 37 formed by folding the extension cylinder part 35, and the airbag body 20 Outflow ports 38 and 39 that can flow out into the gas supply channel 23 are formed.

  Therefore, in the first embodiment, as shown by a two-dot chain line in FIG. 4, the inflating gas G from the inflator 12 is distributed to both sides in different front and rear directions, and flows into the airbag body 20 from the outlets 38 and 39. It can be made to flow out, and the expansion of two predetermined areas 25 and 26 of the airbag body 20 can be promoted. The slit-shaped openings 35a and 35b that form the outlets 38 and 39 are formed on the end surfaces 35d and 35e of the peripheral edge 35c of the extended cylindrical portion 35, and are separately drilled. In addition, since it can be easily formed at the time of cutting the extension cylinder portion 35, the outlets 38 and 39 for distributing the expansion gas G can be easily formed in the inner tube 37 without increasing the number of processing steps. .

  As the head protection airbag 19 of the first embodiment, the airbag main body 20 including the extension cylinder portion 35 is manufactured as a bag weaving type formed by bag weaving. Like the head protection airbag 19A of the second embodiment shown in FIGS. 13 to 13, at least two base fabrics 43 including the extension cylinder portion 35A and disposed on the vehicle inner side I and the vehicle outer side O when the inflation is completed. 44 may be a coupling type formed by coupling.

  In the airbag 19A of the second embodiment, a predetermined portion of the vehicle interior base fabric 43 and the vehicle exterior base fabric 44 made of a flexible woven fabric such as polyamide or polyester is used by using sewing or an adhesive. Are combined and manufactured. In the case of the embodiment, as a sewing type using the suture thread 45, a stitched portion 46 is formed on the outer peripheral edge of the gas inflow portion 20, and the airbag main body 20A and the extension cylinder portion 35A are formed. .

  The suture site 46 is disposed on the inner edge side of the peripheral edge portion 29 including the partition portions 31 and 32 around the gas inflow portion 20.

  Further, in the airbag 19A of the second embodiment, the airbag main body 20A and the extension cylinder portion 35 are not a bag weave type but a sewing type, and are not in contact with the inflation gas G, not the outer surface side of the airbag 19A. A coating layer 41 of silicon rubber or the like for improving heat resistance is provided on the inner peripheral surface side of the airbag 19A to prevent gas leakage, and further, a coating layer is provided on the inner peripheral surface 37a side of the inner tube 37. 41 is different from the airbag 19 of the first embodiment in that the coating layer 41A is provided on the outer surface side of the extension cylinder portion 35A before being folded back so that the coating layer 41A similar to 41 is disposed. The configuration of the other parts is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals and the description thereof is omitted.

  The airbag 19A cuts the vehicle interior / vehicle exterior base fabrics 43 and 44, which form the wall portion between the vehicle interior I and vehicle exterior O of the airbag body 20A including the extension cylinder portion 35A, into a predetermined shape. Then, the coating layer 41 is formed on the mutually opposing surfaces, and the coating layer 41A is formed on the outer peripheral side of the extension cylinder portion 35A. Thereafter, the base fabrics 43 and 44 are overlapped with each other, and a suture site 46 is formed by using the suture thread 45. Then, as shown in FIG. 11, folding is performed at the position of the insertion opening 22a of the connection port portion 22. The airbag 19A of the second embodiment can be manufactured by attaching the eye C, folding the extension cylinder part 35A, and disposing the inner tube 37 in the connection port part 22.

  At the time of mutual stitching of the base fabrics 43 and 44, the portions of the slit-shaped openings 35a and 35b for forming the outlets 38 and 39 of the inner tube 37 should not be sewn at the portion of the extended cylindrical portion 35A. In this case, the slit openings 35a and 35b can be easily formed.

  The airbag 19A manufactured in this way is folded and assembled with the inflator 12 and the mounting bracket 10 (see FIG. 13) in the same manner as the airbag 19 of the first embodiment to form an airbag assembly. It will be mounted on.

  In the head protection airbag 19A of the second embodiment, the inner tube 37 is not separated from the airbag body 20A of the airbag 19A, but is extended from the insertion opening 22a of the connection port 22. If the extension cylinder part 35A is folded back so as to be inserted into the inner peripheral side of the connection port part 22 as shown in FIGS. 11 and 12, the extension cylinder part 35A is formed. Even if the inner tube 37 can be disposed on the inner peripheral side of the connection port portion 22 connected to the inflator 12, the inner tube 37 can be easily manufactured with reduced man-hours and costs. it can.

  Also in the head protection airbag 19A of the second embodiment, the heat-resistant coating layer 41A is provided on the inner peripheral surface 37a serving as the guide surface for the inflation gas G in the inner tube 37 where the extension cylinder portion 35A is folded back. Further, the heat resistance of the connection port portion 22 is further improved, and gas leakage from the vicinity of the connection port portion 22 can be prevented.

  In the case of the second embodiment, the coating layer 41A is provided on the outer surface side of the extension cylinder portion 35A before being folded back, but the extension cylinder portion 35A is further folded back as in the second embodiment. The coating layer 41 applied to the mutually facing surfaces of the base fabrics 43 and 44 is arranged on the inner peripheral surface 37a side of the inner tube 37 as a three-fold (three-layer) instead of being folded in two (two-layer). In this case, the operation of providing the coating layer 41A on the outer surface side of the extension cylinder portion 35A before turning back can be eliminated.

  Further, also in the second embodiment, slit-like openings 35a and 35b communicating between the inside and the outside are formed on the end faces 35d and 35e of at least two edges 35c on the peripheral edge away from the insertion opening 22a in the extension cylinder portion 35A. The slit-shaped openings 35a and 35b distribute the inflation gas G from the inflator 12 to different sides in the front-rear direction to the inner tube 37 formed by folding the extension cylinder portion 35A, so that the airbag body 20A Outflow ports 38 and 39 that can flow out into the gas supply channel 23 are formed. Therefore, also in the second embodiment, as shown by a two-dot chain line in FIG. 9, the inflation gas G from the inflator 12 is distributed to both sides in different front-rear directions and from the outlets 38 and 39 into the airbag body 20A. It can be made to flow out, and the expansion of the predetermined areas 25 and 26 of the airbag main body 20A can be promoted. Moreover, the slit-shaped openings 35a and 35b forming the outlets 38 and 39 are formed on the end surfaces 35d and 35e of the peripheral edge 35c of the extending cylindrical portion 35A, and are separately drilled. In addition, since it can be easily formed at the time of sewing the extension cylinder portion 35A, the outlets 38 and 39 for distributing the expansion gas can be formed in the inner tube 37 without increasing the number of processing steps.

It is a schematic front view which shows the vehicle mounting state of the head protection airbag apparatus in which the head protection airbag of 1st Embodiment of this invention was used. It is sectional drawing which shows the use condition of the airbag of 1st Embodiment, and respond | corresponds to the II-II site | part of FIG. It is sectional drawing which shows the use condition of the airbag of 1st Embodiment, and respond | corresponds to the III-III site | part of FIG. It is a front view which shows the airbag of 1st Embodiment. It is sectional drawing which shows the state at the time of inflation of the airbag of 1st Embodiment, and respond | corresponds to the VV site | part of FIG. It is sectional drawing which shows the state at the time of inflation of the airbag of 1st Embodiment, and respond | corresponds to the VI-VI site | part of FIG. It is sectional drawing which shows the state at the time of inflation of the airbag of 1st Embodiment, and respond | corresponds to the VII-VII site | part of FIG. It is a figure explaining the arrangement | positioning operation | work of the inner tube of the airbag of 1st Embodiment. It is a front view which shows the airbag of 2nd Embodiment. It is sectional drawing which shows the state at the time of inflation of the airbag of 2nd Embodiment, and respond | corresponds to the XX site | part of FIG. It is a figure explaining the arrangement | positioning operation | work of the inner tube of the airbag of 2nd Embodiment. It is sectional drawing of the airbag of 2nd Embodiment, and respond | corresponds to the XII-XII site | part of FIG. It is sectional drawing which shows the use condition of the airbag of 2nd Embodiment.

Explanation of symbols

12 ... Inflator,
19.19A ... Head protection airbag,
22: Connection port,
22a ... opening for insertion,
35 / 35A ... Extension tube,
35a, 35b ... slit-like openings,
37 ... Inner tube,
37a ... (guide surface) inner peripheral surface,
38.39 ... Outlet,
41, 41A ... coating layer,
43 ... Inside car interior fabric,
44 ... the vehicle outer fabric,
W1, W2 ... (window) side window,
G ... expansion gas,
M: Head protection airbag device.

Claims (5)

A cylindrical connection that expands and expands so as to cover the window from the storage part on the upper edge side of the window when the expansion gas flows in, and has an insertion opening for connection with an inflator that supplies the expansion gas With a mouth,
A head protection airbag configured by disposing an inner tube for improving heat resistance on the inner peripheral side of the connection port portion,
The inner tube is disposed such that an extension tube portion formed so as to extend from the connection port portion is folded back at the periphery of the insertion opening and inserted into the connection port portion. Head protection airbag.   The head protection airbag according to claim 1, wherein the head protection airbag is formed by bag weaving including the extension tube portion.   2. The head according to claim 1, wherein at least two base fabrics arranged on the vehicle inner side and the vehicle outer side when the expansion is completed, including the extension cylinder part, are joined to each other. Protective airbag.   4. The coating layer having heat resistance is disposed on the guide surface side of the expansion gas in the inner tube where the extension cylinder portion is folded back. 5. The head protection airbag according to item 1. A slit-like opening communicating between the inside and the outside is formed on the end faces of at least two edges of the peripheral edge away from the insertion opening in the extension cylinder part,
The slit-like opening forms an outflow port that can distribute the inflation gas from the inflator in different directions and flow out into the airbag in an inner tube formed by folding the extension cylinder part. The head protection airbag according to any one of claims 1 to 4, wherein the head protection airbag is provided.

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