JP2007008277A - Airbag system for head protection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag system for head protection, suppressing leakage of gas from a joint portion between an airbag and an inflator. <P>SOLUTION: The airbag system M2 for head protection comprises: the airbag 20A deployed and inflated by the flow in of gas for inflation to cover windows of a vehicle; the inflator 13 supplying the gas for inflation to the airbag 20A; and a clamp 18 disposed to the airbag 20A and pressing, from an outer peripheral side, a tubular connection port part 25 which is fitted on the inflator 13 to connect the inflator 13 with the connection port part 25. A sealing agent 46 for preventing gas leakage is disposed between an outer peripheral face 15b side of the inflator 13 and an inner peripheral face 25a side of the connection port part 25 in the joint portion of the airbag 20A and the inflator 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a head protecting airbag device mounted on a vehicle. More specifically, the airbag suppresses a decrease in internal pressure after completion of deployment and inflation, and cushioning properties even when the vehicle rolls over (rollover). It is related with the head protection airbag apparatus which can ensure and can cover the window of a vehicle.

  2. Description of the Related Art Conventionally, a head protection airbag device includes an airbag that is inflated to inflate an inflation gas so as to cover a vehicle window, and an inflator that supplies the inflation gas to the airbag. In some cases, a clamp is used to connect the airbag and the inflator (for example, see Patent Document 1).

In this head protection airbag device, the airbag is provided with a cylindrical connection port portion that is externally mounted on the inflator, and the clamp is connected to the inflator by pressing the connection port portion externally mounted on the inflator from the outer peripheral side. The mouth was connected.
JP 2002-321587 A

  However, in the conventional head protection airbag device, after the inflation of the airbag is completed, the inflation gas may leak from the connection portion with the inflator, and there is room for improvement in terms of suppressing a decrease in the internal pressure of the airbag. It was.

  Because if the airbag can secure a predetermined internal pressure value for a long time after the completion of inflation, the time for covering the window with the cushioning property can be increased, so that the vehicle is not limited to side collisions, etc. It is also suitable for the case of rollover.

  By the way, in the head protection airbag, it is sufficient to maintain a predetermined internal pressure value for about 3 seconds after the operation of the airbag device at the time of a side collision of the vehicle, but when the vehicle rolls over, For example, it is desirable to maintain a predetermined internal pressure value for about 6 seconds.

  This invention solves the above-mentioned subject, and it aims at providing the head protection airbag apparatus which can suppress the gas leak from the connection location with the inflator in an airbag.

A head protection airbag device according to the present invention is provided in an airbag that expands and inflates so as to cover a vehicle window by flowing in inflation gas, an inflator that supplies inflation gas to the airbag, and the airbag. A head protection airbag device configured to include a clamp that connects the inflator and the connection port portion by pressing the cylindrical connection port portion that is externally mounted on the inflator from the outer peripheral side,
A sealing agent for preventing gas leakage is disposed between the outer peripheral side of the inflator and the inner peripheral side of the connection port at the connection portion between the airbag and the inflator.

  In the head protection airbag device according to the present invention, the inflation gas from the connection portion between the inflator and the connection port is sealed by the sealing agent even after the airbag has inflated the gas for inflow to complete the deployment and inflation. Leakage is suppressed.

  Therefore, the airbag after completion of the inflation is prevented from lowering the internal pressure, and can secure a cushioning property and cover the window for a long time, and even if the vehicle rolls over, Cushioning can be secured and restrained.

  The sealing agent may be disposed between the outer peripheral side of the inflator and the inner peripheral side of the connection port portion when the airbag has the connection port portion directly sheathed on the inflator. In this case, a sealant is disposed on the outer peripheral surface of the inflator side by application, adhesion, adhesion, immersion, or the like, or on the inner peripheral surface side of the connection port portion by application, adhesion, adhesion, immersion, etc. A sealant may be provided.

  In addition, the airbag is interposed between the bag-shaped airbag body having the connection port portion and the connection port portion and the inflator, and regulates the flow of the inflation gas from the inflator to the airbag body side. And an inner tube through which inflation gas flows, between the inner peripheral side of the connection port and the outer peripheral side of the inner tube at the connection portion of the airbag and the inflator, and the outer periphery of the inflator A sealing agent for preventing gas leakage may be disposed between the side and the inner peripheral side of the inner tube. The sealing agent in this case may also be disposed on the outer peripheral surface side or the inner peripheral surface side of a predetermined member such as an inflator by coating, sticking, bonding, dipping or the like.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the head protection airbag device M1 according to the first embodiment includes two head protection airbags 20 at the front and rear of the vehicle V. It covers the inside of the windows (side windows) W1 and W2, and includes an inflator 13, mounting brackets 10 and 16, a clamp 18, and an airbag cover 8 in addition to the airbag 20.

  The side window W1 of the vehicle V is disposed on the side of the front seat, the side window W2 is disposed on the side of the rear seat, and the airbag 20 has the side windows W1, W2, The vehicle interior side of each of the center pillar portion CP between the side windows W1 and W2 and the rear pillar portion RP is covered.

  The airbag cover 8 is configured from the lower edges 4a and 5a of the pillar garnish 4 disposed on the front pillar portion FP and the roof head lining 5 disposed on the roof side rail portion RR, and is folded and stored. The inner side of the airbag 20 is covered. The front pillar garnish 4 and the roof head lining 5 are made of synthetic resin, and the vehicle interior side of the inner panel 2 on the body (vehicle body) 1 side of the vehicle V at the front pillar portion FP and the roof side rail portion RR, respectively. Are attached and fixed. 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 mounting bracket 10 is composed of two sheet metal abutment plates, and is attached to each attachment portion 34 so that each attachment portion 34 of the airbag 20 is sandwiched between the two abutment plates. The attachment portion 34 is attached and fixed to the inner panel 2. Each mounting bolt 11 is fastened to a nut that passes through the mounting hole 34 a of each mounting portion 34 and is provided in the mounting hole of the inner panel 2.

  As shown in FIGS. 1 to 3, the inflator 13 includes a substantially cylindrical cylinder-type inflator body 14 and a substantially cylindrical diffuser 15 that is fixed to the tip (front end) side of the inflator body 14. . The inflator 13 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 16. The mounting bracket 16 is made of sheet metal, holds the inflator body 14, and is fixed to the inner panel 2 by using mounting bolts 17.

  The inflator main body 14 is configured by projecting a small-diameter head portion 14c having a plurality of gas discharge ports 14d opened on the front end surface of a substantially cylindrical large-diameter portion 14a. As a substantially cylindrical sheet metal surrounding the periphery, the rear end 15a is caulked so as to be sheathed and reduced in diameter to a plurality of concave grooves 14b on the front end side of the large diameter portion 14a of the inflator body 14 The inflator body 14 is connected. The expansion gas G discharged from the gas discharge port 14d of the inflator main body 14 is guided by the diffuser 15 and ejected from the opening 15c at the tip of the diffuser 15 along the axial direction of the diffuser 15. Become.

  And the sealing agent 45 which consists of a sheet-like silicon rubber is affixed on the outer peripheral surface 15b of the diffuser 15, as shown in FIG. The sealing agent 45 has a thickness T1 (which can be absorbed without the irregularities of the warp and weft woven from the cloth material disposed in the periphery, in the case of the embodiment, the tube base fabric 42 of the inner tube 39. 7) and elasticity. Incidentally, in the case of the embodiment, the thickness dimension T1 of the sealant 45 is about 0.8 mm.

  As shown in FIGS. 2, 3, 6 and 7, the clamp 18 is formed by bending a band-shaped sheet metal into a ring shape, and is provided with a plurality of locking holes 18c on the outer peripheral portion 18a on the outer peripheral side of the overlapped portion. A locking projection 18e is provided to be locked from the inner peripheral portion 18d on the inner peripheral side to the peripheral edge of each locking hole 18c. The clamp 18 is an air bag that has an inner diameter dimension reduced by pinching and deforming an inverted U-shaped gripping portion 18b of the outer peripheral portion 18a so as to eliminate the internal space, and is externally attached to the diffuser 15 of the inflator 14. Twenty connection ports 25 are connected to the diffuser 15.

  As shown in FIGS. 1 to 5, the head protection airbag 20 includes a bag-shaped airbag body 21 including a cylindrical connection port 25 connected to the inflator 13, a connection port 25, the inflator 13, and the like. And an inner tube 39 that restricts the flow of the inflation gas G from the inflator 13 and flows the inflation gas G toward the airbag main body 21 side.

  The airbag main body 21 includes a gas inflow portion 24 into which the inflation gas G from the inflator 13 can flow, and a non-inflow portion 31 that does not allow the inflation gas G to flow in.

  The gas inflow portion 24 is a protective expansion that swells so as to cover the inside of the cylindrical connection port portion 25 connected to the inflator 13 that supplies the inflation gas G, and the side windows W1 and W2 and the pillar portions CP and RP. And a supply passage portion 26 that supplies the expansion gas G from the connection port portion 25 to the protective expansion portion 27. The connection port portion 25 is disposed so as to extend obliquely upward and rearward from the vicinity of the approximate center in the front-rear direction on the upper edge 21 a side of the airbag body 21. The protective inflating portion 27 includes a front seat portion 28 that covers the vicinity of the side window W1 on the side of the front seat, and a rear seat portion 29 that covers the vicinity of the side window W2 on the side of the rear seat. The supply path portion 26 is disposed along the front-rear direction on the upper edge 21 a side of the airbag body 21, and is disposed over the entire upper end side of the protective inflation portion 27.

  The non-inflow part 31 regulates the thickness of the peripheral part 32 that defines the peripheral part of the gas inflow part 24 and the protective expansion part 27 so that the front seat part 28 and the rear seat part 29 are expanded in a plate shape, respectively. A plurality of thickness regulating portions 33 disposed on the airbag body 21 and an attachment portion 34 provided on the upper edge 21a side of the airbag main body 21 are provided. Each thickness restricting portion 33 is arranged in a line along the vertical direction in the region of the front seat portion 28 and the rear seat portion 29.

  Further, the non-inflow portion 31 includes a connecting cloth 35 disposed on the front end side of the airbag main body 21, and the connecting cloth 35 is located near the front edge of the front seat portion 28 of the airbag main body 21. When the airbag 20 is deployed and inflated, it is placed near the lower portion of the front pillar portion FP. An attachment portion 34 is also formed at the portion of the connecting cloth 35.

  In the case of the embodiment, except for the portion of the connecting cloth 35, the airbag main body 21 is a combined bag type, and is formed from a cloth material having flexibility by forming polyester yarn, polyamide yarn or the like by plain weaving or the like. A predetermined portion of the vehicle inner wall portion 22 and the vehicle outer wall portion 23 is joined to each other by stitching using the suture thread 36 and bonding using the adhesive 37, thereby forming a bag shape. And the site | part of the peripheral part 32 and the thickness control part 33 of the non-inflow part 31 is formed by couple | bonding wall part 22 * 23 mutually using sewing and adhesion | attachment. Further, in the case of the embodiment, each thickness regulating portion 33 is formed continuously with the peripheral edge portion 32 by connecting the suture thread 36 and the adhesive 37 in a single stroke. Further, the adhesive 37 has elasticity so that gas leakage from the suture site of the suture thread 36 can be prevented and the tensile force between the wall portions 22 and 23 when the airbag body 21 is inflated can be relaxed. In the case of the embodiment, silicon rubber is used.

A coating layer made of silicon rubber is also formed on the inner peripheral surfaces of the walls 22 and 23 so as to suppress leakage of the expansion gas G as much as possible. Incidentally, the thickness dimension of this coating layer is about 0.1 to 0.3 mm, which is thinner than the thickness dimensions T1 and T2 of the sealing agent 45 described above and the sealing agent 46 described later, and is per unit area. The coating amount is about 30 to 60 g / m ² .

  Further, the attachment portion 34 is formed at a plurality of locations (six locations in the embodiment) on the upper edge 21a side of the airbag body 21, and the wall portions 22 and 23 are overlapped with each other except for the portion of the connecting cloth 35. An attachment hole 34a that is formed in a state and allows the attachment bolt 11 to pass therethrough is formed.

  As shown in FIGS. 2, 4, 6, and 7, the inner tube 39 has a connecting cylinder part 40 disposed on the inner peripheral surface side of the connection port part 25 and a lower end of the connecting cylinder part 40, and the axial direction is approximately front and rear. It is formed in a substantially L shape provided with an outflow cylinder portion 41 arranged so as to be along the direction. The outflow cylinder portion 41 is disposed on the inner peripheral surface side of the supply passage portion 26, and has inflow ports 41a and 41b through which the expansion gas G flows out on both the front and rear sides. The inner tube 39 is formed by folding a tube base fabric 42 made of a flexible cloth material formed by plain weaving of polyester yarn, polyamide yarn or the like at a front edge side portion of the connecting tube portion 40. The outer peripheral edges are formed by sewing with a suture 43. The opening area of the outflow ports 41a and 41b is set smaller than the outflow port 41b side on the outflow port 41a side where the expansion gas G is likely to flow close to the lower end of the connecting cylinder portion 40 and flows out. Are set so that the outlets 41a and 41b are substantially equal to each other.

  And the sealing agent 46 which consists of sheet-like silicon rubber is affixed on the site | part vicinity of the inflow port 40b in the outer peripheral surface 40a of the connection cylinder part 40 of this inner tube 39. FIG. Similarly to the sealing agent 45, this sealing agent 46 is also a cloth material arranged around it, in the case of the embodiment, the tube base fabric 42 of the inner tube 39 and the wall portion of the connection port 25 in the airbag body 21. 22 and 23 are arranged with thickness T2 (see FIG. 7) and elasticity so that they can be absorbed without the irregularities of warp and weft. In the case of the embodiment, the thickness dimension T2 of the sealing agent 46 is about 0.8 mm, similar to the thickness dimension T1 of the sealing agent 45. The sealing agent 46 is disposed in advance on the tube base fabric 42 before being sewn with the suture thread 43.

  The manufacturing of the head protection airbag 20 will be described. For example, the inner peripheral surface 32 and the thickness regulating portion 33 on the inner side surface of the vehicle outer wall portion 23 in the wall portions 22 and 23 of the airbag body 21 The adhesive 37 is applied and the vehicle interior side wall portion 22 is overlapped on the vehicle outer side wall portion 23 so that the adhesive force is evenly generated in the entire area of the peripheral edge portion 32 and the thickness regulating portion 33. Pressurize the application site. In addition, the thickness dimension T3 (refer FIG. 5) of the adhesive agent 37 which consists of silicon rubber is 0.6-1.0 mm in the case of embodiment. If the wall portions 22 and 23 at the application site of the adhesive 37 are sewn together using the suture thread 36 and then the connecting cloth 35 is sewn, the airbag body 21 can be manufactured. And if the inner tube 39 manufactured beforehand is inserted and arranged in the connection port part 25 of the airbag main body 21, the airbag 20 can be manufactured.

  When the airbag device M1 is mounted on the vehicle V, the airbag 20 is first folded. This fold is folded by bellows folding or the like so that the lower edge 20b side approaches the upper edge 20a side, and a foldable folding prevention tape (not shown) is wound when the folding is completed.

  Further, the inflator 13 to which the mounting bracket 16 and the sealing agent 45 have been attached is inserted into the connecting tube portion 40 on the inner peripheral side of the airbag body 21 and the connection port of the airbag 20 is utilized using the clamp 18. The attachment bracket 10 is attached to each attachment portion 34 of the airbag 20.

  Thereafter, the brackets 10 and 16 are arranged at predetermined positions on the inner panel 2 on the body 1 side, and the bolts 11 and 17 are fixed by inserting the mounting holes 34a, and the brackets 10 and 16 are fixed to the inner panel 2. If fixed to the airbag 20, the airbag 20 can be fixed to the inner panel 2 on the body 1 side.

  Then, a lead wire (not shown) extending from a predetermined control device for inflator operation is connected to the inflator 13, 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 attached. If attached to the body 1, the airbag device M can be mounted on the vehicle V.

  If the inflator 13 is operated after the airbag device M is mounted on the vehicle V, the inflation gas G from the inflator 13 flows into the airbag 20, and the airbag 20 is wrapped and not shown in the drawing. Further, the air bag cover 8 on the side of the lower edges 4a and 5a of the front pillar garnish 4 and the roof head lining 5 is pushed open so as to protrude downward, as shown by a two-dot chain line in FIG. W1 and W2 and the pillars CP and RP will expand and expand greatly so as to cover the inside of the vehicle.

  In the head protecting airbag device M1 of the first embodiment, the inflator 13 and the airbag 20 are sealed by the sealing agents 45 and 46 even after the airbag 20 has caused the inflation gas G to flow in to complete the deployment and inflation. Connection portion, that is, in the case of the embodiment, between the outer peripheral surface 15b of the diffuser 15 of the inflator 13 and the inner peripheral surface 40c of the connecting tube portion 40 of the inner tube 39, and the connecting tube portion of the inner tube 39. Leakage of the inflation gas G from the connecting portion between the outer peripheral surface 40a of 40 and the inner peripheral surface 25a of the connection port portion 25 of the airbag main body 21 is suppressed.

  Therefore, the airbag 20 after the completion of the inflation is prevented from lowering the internal pressure, can secure the cushioning property for a long time and can cover the side windows W1 and W2, and even if the vehicle V rolls over, The occupant's head can be restrained while ensuring cushioning. Incidentally, in the case of the embodiment, the predetermined internal pressure value of the airbag 20 could be maintained for more than twice as long as the case where the sealing agents 45 and 46 were not used.

  In the first embodiment, the airbag 20 is configured by the airbag body 21 and the inner tube 39 disposed in the connection port 25 of the airbag body 21. Even if the diffuser 15 and the connection port 25 of the inflator 13 are connected without providing the inner tube as in the airbag 20A used in the head protection airbag device M2 of the second embodiment shown in FIGS. Good.

  Similar to the airbag body 21 in the airbag 20 of the first embodiment, the airbag 20A includes an inner side wall portion 22 and an outer side wall portion 23 made of a woven fabric using polyamide yarn or the like, and a suture thread 36. Although it is configured as a combined bag type formed using the adhesive 37, the width dimensions B1 and B2 of the adhesive 37 in a state in which the wall portions 22 and 23 in the vicinity of the connection port portion 25 are unfolded flatly. B3 and B4 are different from the airbag main body 21 of the first embodiment. That is, as shown in FIGS. 9 and 10, portions 51, 52, and the like of the adhesive 37 intersecting with the flow direction of the main flow MF of the expansion gas G flowing from the connection port 25 in the vicinity of the connection port 25 and the reverse flow RF. 53 and 54 are set such that the width dimensions B1, B2, B3, and B4 are larger than the width dimension B0 of the other portion (general part) 50 of the adhesive 37.

  These wide adhesion portions 51, 52, 53, and 54 are portions where stress concentration is likely to occur due to abrupt gas pressure with the inflow of the expansion gas G, and the connection port portion 25, the supply passage portion 26, Or the peripheral edge of the crossing part of the supply passage part 26 and the protective expansion part 27 in the vicinity of the connection port part 25. More specifically, the wide adhesion portion 51 is a portion toward the front seat portion 28 on the upper edge 26a side of the supply passage portion 26 at the intersection portion of the connection port portion 25 and the supply passage portion 26. The part 52 is a part on the lower edge 26 b side of the supply path part 26 at the intersection part of the connection port part 25 and the supply path part 26, and a part on the front edge 29 b side toward the vertical cell part 29 a side of the front end of the rear seat part 29. Yes, the adhesion part 53 is on the lower edge 26b side of the supply path part 26 at the intersection part of the connection port part 25 and the supply path part 26, and on the rear edge 29c side toward the vertical cell part 29a side of the front end of the rear seat part 29 It is a part of. Furthermore, the wide adhesion portion 54 is a portion toward the rear seat portion 29 on the upper edge 26a side of the supply passage portion 26 at the intersection portion of the connection port portion 25 and the supply passage portion 26.

  In the case of the second embodiment, the width dimension B0 of the general part 50 is about 8 to 12 mm, and the width dimensions B1, B2, B3, and B4 of the wide adhesive portions 51, 52, 53, and 54 are wider than the general part 50. About 10 to 30 mm, the portion where stress concentration is likely to occur is set to be large. Specifically, the width dimension B0 of the general part 50 is 10 mm, and the width dimension B1 of the adhesion part 51 is 20 mm. The width B2 of the bonding part 52 is 15 mm, the width B3 of the bonding part 53 is 30 mm, and the width B4 of the bonding part 54 is 15 mm. Further, the thickness dimension T3 of the adhesive 37 is set to 0.6 to 1.0 mm as in the first embodiment. Further, these wide adhesive portions 51, 52, 53, and 54 do not suddenly increase the width dimension from the surrounding general portion 50, but gradually increase from the width dimension B0 of the surrounding general portion 50. Is formed by coating.

  And of course, the sealing agent 45 is stuck on the outer peripheral surface 15b of the diffuser 15 of the inflator 13 as in the first embodiment (see FIG. 11).

  The airbag 20A is not provided with the inner tube 39, is folded in the same manner as the airbag 20 of the first embodiment, is connected to the inflator 13, and is mounted on the vehicle.

  Even in the head protection airbag device M2 of the second embodiment using the airbag 20A, even after the airbag 20A has inflated the inflation gas G to complete the deployment and inflation, the sealing agent 45 causes the inflator 13 to Leakage of the inflation gas G from the connection point with the airbag 20A, that is, between the outer peripheral surface 15b of the diffuser 15 of the inflator 13 and the inner peripheral surface 25a of the connection port 25 of the airbag 20A is suppressed. Actions and effects similar to those of the first embodiment can be obtained.

  Furthermore, in the airbag 20A of the second embodiment, even if the inner tube 39 is not provided, the adhesive 37 having elasticity is provided at a portion where stress concentration is likely to occur due to gas pressure when the inflation gas G flows. The wide adhesion portions 51, 52, 53, 54 bonded in the above are provided, and even if the vehicle inner and outer wall portions 22, 23 are pulled suddenly, these wide adhesion portions 51, 52, 53, 54 exhibits elasticity and can prevent the wall portions 22 and 23 from being damaged.

  And of course, in the airbag 20A, when the wall portions 22 and 23 are connected to each other, the width of the adhesive 37 to be applied is simply increased by a predetermined portion 51, 52, 53 and 54, thereby reducing the number of manufacturing steps. It can be manufactured in the same way as the airbag body 21 without increasing, and conversely, since the inner tube is not required, manufacturing man-hours and costs can be reduced compared to the airbag 20, and the weight and storage space are further reduced. can do.

  As shown by the two-dot chain line in FIG. 10, the wall portions 22 and 23 are separated from each other at the wide bonding portions 51, 52, 53, and 54 of the airbag 20A. It is also possible to prevent the parts 22 and 23 from being damaged.

  Further, the sealing agent 45 is provided in the case where the airbag 20A directly covers the connection port 25 on the inflator 13, as in the second embodiment, and the connection port 25 on the outer peripheral side of the diffuser 15 in the inflator 13. In this case, as in the second embodiment, the sealing agent 45 is applied to the outer peripheral surface 15b on the inflator 13 side by application, adhesion, adhesion, immersion, or the like. Alternatively, the sealing agent 45 may be disposed on the inner peripheral surface 25a side of the connection port portion 25 by coating, sticking, bonding, dipping, or the like. Of course, the sealing agent 45 may be disposed on both the outer peripheral surface 15b side and the inner peripheral surface 25a side.

  Moreover, like 1st Embodiment, between the inner peripheral surface 25a side of the connection port part 25 of the airbag main body 21, and the outer peripheral surface 40a side of the inner tube 39, and the outer peripheral surface 15b side of the inflator 13, and an inner tube When the sealing agents 45 and 46 for preventing gas leakage are disposed between the inner peripheral surface 40c of the inner tube 39 and the inner peripheral surface 40c of the connecting tube portion 40 of the inner tube 39, as shown in FIG. The sealing agent 45 or 46 is adhered to 40a, or the sealing agent 46 is disposed not on the outer peripheral surface 40a side of the inner tube 39 but on the inner peripheral surface 25a side of the connection port 25. You can leave. Of course, sealing agents 45 and 46 are disposed on the outer peripheral surface 15 b of the diffuser 15, the inner and outer peripheral surfaces 40 c and 40 a of the connecting tube portion 40 of the inner tube 39, and the inner peripheral surface 25 a of the connecting port portion 25. May be.

  Further, in order to improve the sealing performance of the sealing agents 45 and 46, as shown in FIG. 13, an annular concave groove disposed on the entire circumference in the circumferential direction at the connection place of the clamp 18 in the diffuser 15 of the inflator 13. 15d is provided, and the sealing agents 45 and 46 are disposed in a length dimension exceeding the concave groove 15d. When the clamp 18 is tightened, the concave groove 15d and the clamp 18 are in a state in which the connection port portion 25 of the airbag main body 21, the connection tube portion 40 of the inner tube 39, and the sealing agents 45 and 46 are interposed. The dimensions are set such that the clamp 18 is fitted into the concave groove 15d. Therefore, in such a seal structure, in the vicinity of both edges of the concave groove 15 d along the axial direction of the diffuser 15, the inner peripheral surface 25 a side of the connection port portion 25 of the airbag main body 21 and the outer peripheral surface 40 a side of the inner tube 39. And between the outer peripheral surface 15b side of the inflator 13 and the inner peripheral surface 40c side of the inner tube 39, the sealing agents 45 and 46 are compressed, and the sealing performance can be further improved. it can. In addition, you may utilize the diffuser 15 which provided this ditch | groove 15d for the connection of the airbag 20A and inflator 13 of 2nd Embodiment.

  Of course, even if the concave groove as described above is not provided, for example, if the axial length L0 (see FIG. 6) of the clamp 18 is about 5 to 20 mm, the length L1 of the sealing agents 45 and 46 is set. -L2 should just be set longer than the length dimension L0.

  Further, when the inner tube 39 is interposed between the connection port 25 of the airbag main body 21 and the inflator 13, the seam allowance of the connecting tube portion 40 formed when the tube base fabric 42 is folded and stitched. 14, as shown in FIG. 14, the seam allowance 44 itself is not provided with the sealing agent 46, or as shown in FIG. 15, only on the side of the outer surface 44 a of the seam allowance 44 that is bent when connected. A sealing agent 46 may be provided to reduce the thickness of the folded seam allowance 44. Further, in order to reduce the thickness of the bent seam allowance 44, as shown in FIG. 16, the air bag is not provided on the outer peripheral surface 40 a side of the connecting tube portion 40 of the inner tube 39. A sealing agent 46 may be disposed on the inner peripheral surface 25 a side of the connection port portion 25 of the main body 21.

  Further, as a clamp that is plastically deformed to pinch the gripping portion 18b and narrows the inner diameter dimension, when the connection port portion 25 and the inflator 13 are connected, the step between the outer peripheral portion 18a and the tip portion 18g of the inner peripheral portion 18d is The inner peripheral side may be smoothed as much as possible. For example, like the clamp 18A of FIGS. 17A and 17B, when the gripping portion 18b is pinched and plastically deformed, an insertion hole 18f into which the distal end portion 18g is inserted is provided in the outer peripheral portion 18a, or FIGS. As shown in the clamp 18B, when the holding portion 18b is pinched and plastically deformed, a stepped recess 18h that houses the tip 18g may be provided in the outer peripheral portion 18a.

It is a schematic front view which shows the vehicle mounting state of the head protection airbag apparatus of 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the connection location of the inflator and airbag of the airbag apparatus of 1st Embodiment, and respond | corresponds to the II-II site | part of FIG. It is a longitudinal cross-sectional view of the connection location of the inflator and airbag of the airbag apparatus of 1st Embodiment, and respond | corresponds to the III-III site | part of FIG. It is a front view of the airbag used for a 1st embodiment. It is a fragmentary longitudinal cross-sectional view at the time of expansion | swelling of the airbag used for 1st Embodiment, and respond | corresponds to the VV site | part of FIG. It is a front view which shows the inflator, inner tube, and clamp which are used for 1st Embodiment. It is a longitudinal cross-sectional view which shows the inflator, inner tube, and clamp which are used for 1st Embodiment. It is a front view of the airbag used for the head protection airbag apparatus of 2nd Embodiment. It is a partial expanded front view which shows the airbag of 2nd Embodiment. It is a fragmentary sectional view at the time of expansion | swelling of the airbag of 2nd Embodiment, and respond | corresponds to the XX part of FIG. It is a longitudinal cross-sectional view of the connection location of the inflator and airbag in the airbag apparatus of 2nd Embodiment. The modification of 1st Embodiment is shown and it is a partial longitudinal cross-sectional view which shows an inflator, an inner tube, and a clamp. The other modification of the airbag apparatus of 1st Embodiment is shown, and it is a longitudinal cross-sectional view of the connection location of an inflator and an airbag. It is a longitudinal cross-sectional view of the connection location of the inflator and the airbag, showing still another modification of the airbag device of the first embodiment. It is a longitudinal cross-sectional view of the connection location of the inflator and the airbag, showing still another modification of the airbag device of the first embodiment. It is a longitudinal cross-sectional view of the connection location of the inflator and the airbag, showing still another modification of the airbag device of the first embodiment. It is a figure which shows the use condition of the modification of the clamp used in 1st Embodiment. It is a figure which shows the use condition of the other modification of the clamp used in 1st Embodiment.

Explanation of symbols

13 ... Inflator,
15 ... Diffuser,
15b ... outer peripheral surface,
18 ・ 18A ・ 18B… Clamp,
20.20A ... Head protection airbag,
21 ... Airbag body,
25. Connection port,
39 ... Inner tube,
45.46 ... sealant,
V ... Vehicle,
W1, W2 ... (window) side window,
G ... expansion gas,
M1, M2 ... Head protection airbag device.

Claims (2)

An airbag that is inflated to inflate an inflation gas so as to cover a vehicle window, an inflator that supplies the inflation gas to the airbag, and a cylindrical shape that is provided on the airbag and is externally mounted on the inflator A head protection airbag device configured to include a clamp that presses a connection port portion from the outer peripheral side and connects the inflator and the connection port portion,
A head having a sealant for preventing gas leakage disposed between an outer peripheral side of the inflator and an inner peripheral side of the connection port at a connection portion between the airbag and the inflator. Protective airbag device. An airbag that is inflated to inflate an inflation gas so as to cover a vehicle window, an inflator that supplies the inflation gas to the airbag, and a cylindrical shape that is provided on the airbag and is externally mounted on the inflator A clamp that presses the connection port portion from the outer peripheral side and connects the inflator and the connection port portion, and is configured,
The airbag is interposed between a bag-shaped airbag body provided with the connection port portion, and the connection port portion and the inflator, and regulates the flow of the inflation gas from the inflator to control the airbag. An inner tube that causes the inflation gas to flow to the bag body side, and a head protection airbag device configured to include:
Between the inner peripheral side of the connection port portion and the outer peripheral side of the inner tube at the connection site between the airbag and the inflator, and between the outer peripheral side of the inflator and the inner peripheral side of the inner tube. A head protecting airbag device, wherein a sealing agent for preventing gas leakage is disposed.

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