JP5768707B2 - Head protection airbag device - Google Patents

Description

  The present invention relates to a head having a configuration including an airbag that is folded and stored on an upper edge side of a window inside a vehicle, and an inflator that is disposed on the upper edge side of the window and supplies inflation gas to the airbag. The present invention relates to a protective airbag device.

  Conventionally, as a head protection airbag device, an airbag includes a bag body and an inner tube disposed in the bag body, and the inner tube is located on the upper edge side of the bag body at the completion of inflation. There is a configuration that is arranged substantially along the front-rear direction and has a gas outlet hole on the front end side for allowing the inflation gas to flow into the bag body. In this conventional head protection airbag device, the inner tube has a configuration in which only the rear end side is connected to the bag body side (see, for example, Patent Document 1).

  Moreover, as a head protection airbag device having a configuration in which the inner tube is disposed in the bag body, the bag body is a suture bag formed by stitching the base fabrics together, and the upper edge side portion at the time of manufacturing the bag body In some cases, the inner tube is stitched together and connected to the bag body side during the sewing operation (see, for example, Patent Documents 2 to 4).

JP 2009-227161 A JP 2009-214616 A JP 2000-127886 A Special table 2006-515544 gazette

  However, in the head protection airbag device described in Patent Document 1, since the inner tube has a configuration in which only the rear end side that is the inflator side is connected to the bag body side, the inner tube is disposed on the front end side. When the inflation gas flows out from the gas outflow hole into the bag body, the front end side part is shaken, or the inner tube is contracted so as to reduce the length dimension during the inflation of the airbag Thus, the position of the gas outflow hole may be greatly displaced with respect to the bag body.

  Moreover, in the head protection airbag device described in Patent Documents 2 to 4, the inner tube is overlapped on the base fabric constituting the bag body and is sewn together with the bag body. Therefore, the vicinity of the gas outflow hole is hidden behind the bag body, and its position cannot be confirmed directly, so that for each airbag, the gas outflow hole formed at the tip is likely to vary in the position of the bag body, There was room for improvement in that the accuracy of the arrangement position of the gas outflow holes in the bag body was good. Moreover, in the head protection airbag devices described in Patent Documents 2 to 4, since the inner tube is sewn together on the bag body over substantially the entire region in the longitudinal direction (front and rear), the inner tube is sewn together. The overlapping base fabrics that have been stitched together with the seams are bulky, making it difficult to fold the airbag in a compact manner, making it difficult to mount it in a narrow space on the upper edge side of the window.

  The present invention solves the above-described problems, can be mounted without being bulky, and can improve the accuracy of the arrangement position of the gas inflow hole formed in the inner tube in the bag body. Another object of the present invention is to provide a head protecting airbag device that can stabilize the position of the tip of the inner tube during operation.

A head protection airbag device according to the present invention includes an airbag that is folded and stored on an upper edge side of a window inside a vehicle, and an inflator that is disposed on the upper edge side of the window and supplies inflation gas to the airbag. And a configuration comprising:
The airbag is configured to include a bag body, and an inner tube that is disposed in the bag body and guides the inflation gas discharged from the inflator into the bag body.
The inner tube has a substantially cylindrical shape and is disposed substantially along the front-rear direction on the upper edge side of the bag body at the completion of inflation, and has a gas outlet hole through which inflation gas flows out into the bag body. A protective airbag device,
The bag body is configured to include an inflow portion that inflates by inflating the inflating gas and a non-inflow portion that does not allow the inflating gas to flow inside,
The inner tube is configured to include a mounting piece portion formed so as to partially protrude from the upper edge or the lower edge in a state where the inner tube is flatly developed in the region of the tip portion which is one end side in the front-rear direction,
The inner tube is inserted into a mounting recess formed so that at least the front and rear sides of the bag body are surrounded by a non-inflow portion in the bag body, and is joined to the portion of the mounting recess. Is connected to the bag body.

  In the head protection airbag device of the present invention, the inner tube is connected to the bag body using the attachment piece portion on the front end side which is one end side in the front-rear direction. When the inflation gas is allowed to flow out from the gas outflow hole into the bag body, it is possible to accurately prevent the tip side portion from greatly shaking. For this reason, it is possible to accurately suppress the vicinity of the gas outflow hole through which the inflation gas flows out into the bag body. In the head protection airbag device of the present invention, the inner tube receives a force that reduces the length of the inner tube toward the distal end portion by the inflation gas flowing into the bag body during the inflation of the airbag. Even so, the inner tube is connected to the bag body using the mounting piece on the tip side, so that it can be accurately suppressed from shrinking so as to reduce the length dimension. The position of the gas outflow hole with respect to the bag body at the time of gas outflow can be stabilized.

  Furthermore, in the head protection airbag device of the present invention, the inner tube has a distal end portion by inserting the attachment piece portion into the attachment recess portion formed in the bag body and coupling the attachment piece portion to the portion of the attachment recess portion. Since the side part is connected to the bag body, the arrangement position of the tip portion relative to the bag body can be stabilized, and the arrangement position of the gas outflow holes in the bag body varies for each airbag. hard. In particular, in the head protection airbag device of the present invention, since the inner tube is inserted into the bag body formed in advance and the attachment piece portion is attached to the attachment recess portion, the gas outflow hole The arrangement position in the bag body can be made substantially constant. Therefore, the airbag can be manufactured with good accuracy of the arrangement position of the gas outflow hole in the bag body.

  Furthermore, in the head protection airbag device of the present invention, the mounting recess of the bag body to which the mounting piece is attached is surrounded at least on both the front and rear sides by a non-inflow portion. That is, in the head protection airbag device of the present invention, in the bag body, in the vicinity of the attachment recess, the non-inflow portion is connected linearly along the front-rear direction across the attachment recess, so that it is adjacent to the attachment recess. The expansion portion expands so that the edge is linearly arranged along the front-rear direction. Therefore, when the bag body is inflated, it is possible to suppress a large tension from acting on the region where the attachment piece is attached, and when the attachment piece is configured to be sewn to the attachment recess using a suture. In addition, it is possible to suppress the occurrence of gas leakage from the peripheral portion of the sutured portion as much as possible. Furthermore, in the head protection airbag device of the present invention, the inner tube is coupled to the bag body side only at the portion of the attachment piece portion disposed on the tip side, so that the airbag is not bulky. It can be folded compactly and can be mounted smoothly even if the space on the upper edge side of the window is narrow.

  Therefore, the head protection airbag device of the present invention can be mounted without being bulky, and the accuracy of the arrangement position of the gas inflow hole formed in the inner tube within the bag body can be improved. In addition, the position of the tip of the inner tube at the time of operation can be stabilized.

Further, in the head protection airbag device of the present invention, the mounting piece is formed on the upper edge side of the inner tube in a flatly deployed state,
In the mounting recess, an opening is formed in the non-inflow portion on the upper edge side of the outer peripheral edge of the bag body so that the mounting piece of the inner tube inserted into the bag body can be gripped from outside the bag body. A configuration is preferable.

  In the head protection airbag device having the above-described configuration, when the inner tube is stored in the bag body, the mounting piece portion is gripped by hand and pulled out from the opening so as to be stored in the mounting recess. As a result, it is easy to store the mounting piece in the mounting recess, and the inner tube can be positioned more accurately with respect to the bag body.

Furthermore, in the head protection airbag device having the above configuration, the bag body is formed from a bag weave,
The gas inlet
A plurality of protective body parts arranged in parallel along the front-rear direction when the expansion is completed;
On the upper edge side at the time of completion of expansion, the gas supply path portion that is arranged to extend substantially along the front-rear direction and guides the inflation gas discharged from the inflator to each protection main body portion, and
A connection port portion formed so as to protrude from the rear end side of the gas supply path portion so as to be continuous with the gas supply path portion, and to be openable on the rear end side so that an inflator can be inserted,
And comprising
The inner tube is configured so as to cover the inner peripheral side from the connection port portion to the gas supply path portion in the bag body, the mounting piece portion is arranged on the upper edge side of the tip portion, and the gas outflow hole is formed. In the region of the leading end, the expansion gas is disposed at a position where the expansion gas can flow out to the protection main body side disposed on the front side, and the expansion gas flows out to the protection main body side disposed on the rear side. With two gas outflow holes,
On the lower edge side of the gas supply passage in the bag body, a non-inflow portion is formed, and a support coupling portion that supports the lower portion of the inner tube is formed,
It is preferable that each of the protection main body portions is connected to the gas supply path portion on the front side and the rear side of the support coupling portion so that the inflation gas flows into the inside.

  In the head protection airbag device having the above configuration, since the inner tube is coupled to the bag body side by the attachment piece at the front end side, the bag body is connected to the rear end side of the gas supply path portion. Even when the inflator is connected to the connection port portion arranged on the rear end side of the gas supply passage portion, the inner tube tip side away from the inflator during operation is It is possible to suppress the blurring to the side. Therefore, the gas for expansion can be stably flowed out from the gas outflow hole arranged in the region of the tip portion. As a result, in the head protection airbag device having the above-described configuration, the longitudinal dimension of the support coupling portion that supports the lower portion of the inner tube can be relatively shortened, in other words, the support coupling portion. The width dimension before and behind the communication part with the gas supply path part of each protection main-body part in the front side and the rear side can be ensured widely. Therefore, each protection main body can be expanded thickly so as to be integrally expanded from the inner tube arrangement position (gas supply path) to the lower edge of the protection main body, and from this gas supply path Since a region that inflates integrally over the protective main body can be secured widely in the front and rear, the head of the occupant can be protected with good cushioning properties by each of the protective main bodies that have been inflated.

It is the schematic front view which looked at the vehicle mounting state of the head protection airbag device which is one Embodiment of this invention from the vehicle inner side. It is a front view of the state where the air bag used for the head protection air bag device of an embodiment was developed flat. FIG. 3 is a partially enlarged front view showing a portion of an inner tube in the airbag of FIG. 2. It is sectional drawing of the IV-IV site | part of FIG. It is sectional drawing of the VV site | part of FIG. It is sectional drawing of the VI-VI site | part of FIG. It is sectional drawing of the VII-VII site | part of FIG. It is a longitudinal cross-sectional view of the state which inflated the airbag of FIG. 2 alone, and is a figure corresponding to the VIII-VIII part of FIG. FIG. 3 is a front view of a state in which a bag body and an inner tube used in the airbag of FIG. 2 are flatly deployed and arranged. FIG. 10 is a development view of an inner tube base fabric constituting the inner tube of FIG. 9.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a head protection airbag device M according to an embodiment is a two-row seat type vehicle having a front seat and a rear seat. It is arranged on the upper edge side of the windows SW1 and SW2 on the vehicle interior side of V, and includes an airbag 20, an inflator 14, mounting brackets 10 and 16, and an airbag cover 8. In the case of the embodiment, the airbag 20 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 windows SW1 and SW2 of the vehicle V. The range is folded and stored, and expands and expands from the upper edge side of the windows SW1 and SW2 to the lower side so as to cover the inside of the windows SW1 and SW2 when the expansion gas flows in.

  As shown in FIG. 1, the airbag cover 8 is configured from the lower edge sides of the front pillar garnish 4 disposed in the front pillar portion FP and the roof head lining 5 disposed in the roof side rail portion RR. ing. 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 on the body 1 side at the front pillar portion FP and the roof side rail portion RR, respectively. Yes. 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. Further, a rear pillar garnish 6 and a center pillar garnish 7 made of synthetic resin are disposed on the inner sides of the rear pillar portion RP and the center pillar portion CP, respectively.

  As shown in FIGS. 1 and 3, the inflator 14 is a cylinder type whose outer shape is a substantially cylindrical shape, and the tip of a substantially cylindrical main body 14 a that is arranged with the axial direction approximately along the front-rear direction. A small-diameter portion 14b having a smaller diameter than the main body 14a is arranged on the side (front end side). The small diameter portion 14b is provided with a gas discharge port (not shown) that can discharge the expansion gas. The inflator 14 is configured by tightening a clamp disposed so as to cover the outer peripheral side of the connection port portion 24 in a state where the small diameter portion 14b is inserted into the bag body 21 (inside the connection port portion 24) of the airbag 20. The connection port 24 is connected. In the case of the embodiment, as shown by a two-dot chain line in FIG. 3, in the mounting bracket 16 for mounting the inflator 14 to the inner panel 2 on the vehicle body 1 side, the holding ring portion 16 a of the mounting bracket 16 disposed on the front side is The clamp which connects the inflator 14 and the connection port part 24 is comprised.

  The mounting bracket 16 for attaching the inflator 14 to the inner panel 2 is made of sheet metal, and extends from both end sides of the holding ring portion 16a and the holding ring portion 16a curved in a substantially annular shape that can be disposed around the main body 14a of the inflator 14. In the case of the embodiment, two mounting plate portions 16b are arranged on the front and rear along the axial direction of the inflator 14. These mounting brackets 16 are for fixing the mounting plate portion 16b to the inner panel 2 on the body (vehicle body) 1 side in a state where the holding ring portion 16a is disposed so as to cover the outer peripheral side of the main body 14a of the inflator 14. The inflator 14 is attached to the inner panel 2 by attaching it to the inner panel 2 using the bolts 17. Further, when the mounting bracket 16 is attached to the inner panel 2, the holding ring portion 16 a of the front mounting bracket 16 serves as a clamp so as to cover the outer peripheral side of the inflator 14. The connection port portion 24 is tightened from the outer periphery side, and the main body 14a of the inflator 14 and the connection port portion 24 of the airbag 20 are connected. In the case of the embodiment, as shown in FIG. 1, the inflator 14 is disposed on the inner panel 2 in the region above the rear pillar portion RP.

  The mounting bracket 10 for mounting mounting portions 33 and 43, which will be described later, of the airbag 20 to the inner panel 2 on the body 1 side is composed of two sheet metal plates. , 43 are attached to the respective attachment portions 33, 43, and the attachment portions 33, 43 are attached and fixed to the inner panel 2 by using the attachment bolts 11.

  The airbag 20 is provided with the bag main body 21 and the inner tube 46 arrange | positioned in the bag main body 21, as shown to FIGS.

  As shown in FIG. 1, the bag body 21 is located above the rear pillar portion RP from the lower edge side of the front pillar portion FP through the lower edge side of the roof side rail portion RR on the upper edge side of the windows SW1 and SW2 of the vehicle V. In the range up to, it is folded and stored. Then, the bag body 21 allows the inflation gas G from the inflator 14 to flow in and expands from the folded state, and as shown by the two-dot chain lines in FIG. 1, the windows SW1 and SW2 and the center pillar portion CP Expansion is completed so as to cover the inner side of the center pillar garnish 7 disposed on the inner side of the vehicle and the inner side of the rear pillar garnish 6 disposed on the inner side of the rear pillar portion RP. In the case of the embodiment, the bag body 21 is manufactured by bag weaving using polyamide yarn, polyester yarn or the like. As shown in FIGS. 2 to 8, the bag body 21 is provided between the vehicle inner wall portion 22a and the vehicle outer wall portion 22b. A gas inflow portion 22 that expands by inflating an expansion gas into the vehicle, and a non-inflow portion 31 that is configured to couple the vehicle interior side wall portion 22a and the vehicle exterior wall portion 22b and does not allow the expansion gas to flow into the interior. Have. In the case of the embodiment, the bag body 21 is coated on the entire outer surface with a coating agent made of silicon or the like for preventing gas leakage.

  In the case of the embodiment, the gas inflow portion 22 includes a gas supply path portion 23, a connection port portion 24, and two protective main body portions 26 and 27 that are arranged in front and rear.

  The gas supply passage portion 23 is disposed so as to extend substantially along the front-rear direction so as to follow the front-rear direction of the vehicle V on the upper edge 21 a side when the expansion of the bag body 21 is completed, and is discharged from the inflator 14. The expansion gas G is guided to the protection main body portions 26 and 27 disposed below the gas supply passage portion 23. In the case of the embodiment, the gas supply path portion 23 is disposed in the rear half region of the bag body 21, and the front end side is disposed above the rear end of the front protective body portion 26. . The connection port portion 24 is formed in a substantially cylindrical shape protruding rearward from the rear end of the gas supply passage portion 23 so as to be continuous with the gas supply passage portion 23, and the rear end side is opened so that the inflator 14 can be inserted. Is formed.

  The protection main body 26 is a portion that is disposed on the side of the front seat when the expansion of the bag main body 21 is completed, and the front and rear are separated by a partition 36 that is formed to extend upward from the lower edge 21b side of the bag main body 21. And the front end vicinity portion is divided into two in the vertical direction by a partition portion 35 extending rearward from the front edge side of the bag body 21. The protection main body 27 is a part that is disposed on the side of the rear seat when the bag main body 21 is inflated. Moreover, in the bag main body 21 of the embodiment, from the rear lower end of the protective main body portion 26 to the vicinity of the front end of the protective main body portion 27 along the front-rear direction on the lower edge side of the bag main body 21 between the protective main body portions 26 and 27. A lateral expansion portion 28 that extends and is closed on the rear end side with respect to the protection main body portion 27 is formed. The lateral expansion portion 28 is configured such that the front end side communicates with the protection main body portion 26 and the expansion gas G flows into the inside through the protection main body portion 26.

  In the case of the embodiment, the non-inflow portion 31 includes a peripheral edge portion 32, an attachment portion 33, a plate-like portion 34, and partition portions 35 and 36.

  The peripheral portion 32 surrounds the periphery of the gas inflow portion 22 in the bag body 21 over the entire circumference except for the portion of the opening 24a in the connection port portion 24 and the portion of the opening 40 of the mounting recess 39 described later. Is formed. The attachment portion 33 is formed so as to extend upward from a portion on the upper side of the peripheral edge portion 32 disposed on the upper edge 21a side of the bag body 21, and is provided at a plurality of locations (in the case of the embodiment, 6 in the embodiment). ). The attachment portion 33 is a portion that connects the upper edge 21a side of the bag body 21 to the body 1 side of the vehicle V, and connects and fixes the airbag 20 to the body 1 side. An insertion hole 33a through which the mounting bolt 11 for fixing to the inner panel 2 on the side can be inserted is provided. Each attachment portion 33 is attached and fixed to the inner panel 2 using the attachment bracket 10 and the attachment bolt 11. The plate-like portion 34 is disposed between the protection main body portions 26 and 27 which are below the gas supply passage portion 23 and above the lateral expansion portion 28, and have a substantially rectangular outer shape. ing. In the airbag 20 of the embodiment, the plate-like portion 34 constitutes a support coupling portion that supports the lower side (the lower edge 46c side) of the inner tube 46.

  The partition portion 35 is formed substantially along the front-rear direction so as to extend rearward from the front edge side portion of the peripheral edge portion 32, and partitions the front region of the protection main body portion 26 vertically. This partition part 35 is arranged to make it easier to open the front pillar garnish 4 constituting the airbag cover 8 when the airbag 20 is initially inflated by inflating the front upper region of the protective body part 26 in a rod shape. Has been. The partition portion 36 is formed substantially along the vertical direction so as to extend upward from a portion on the lower edge side in the peripheral edge portion 32 in the region of the protection main body portion 26.

  In addition, the bag body 21 of the embodiment is formed with an attachment recess 39 for inserting an attachment piece portion 49 formed on the inner tube 46. The mounting recess 39 is formed at a position corresponding to the mounting piece 49 when the inner tube 46 is accommodated in the bag body 21. In the case of the embodiment, as shown in FIGS. 21 is formed in an upper portion 32 a of the peripheral edge portion 32 which is a portion on the upper edge side of the outer peripheral edge. Specifically, the mounting recess 39 is configured so that the upper portion 32a of the peripheral edge portion 32 is located on the front side at a position slightly ahead of the front and rear centers (specifically, a portion between the partition portion 36 and the plate-like portion 34). It is formed so as to be divided into a part 32af and a rear part 32ab. That is, the mounting recess 39 is surrounded by the upper side portion 32a (front side portion 32af, rear side portion 32ab) on both the front and rear sides, and is connected to the gas supply path portion 23 so that the vehicle inner side wall portion 22a and the vehicle outer side wall portion 22b are connected. Can be separated from each other, and the upper end side is opened so that the mounting piece 49 is inserted between the vehicle inner wall portion 22a and the vehicle outer wall portion 22b (see FIGS. 4 and 6). . In the case of the embodiment, as shown in FIG. 9, the mounting recess 39 has a width dimension W1 in the front-rear direction from the insertion-side opening 39a on the lower end side for inserting the mounting piece 49 to the opening 40 on the upper end side (see FIG. 9). ) Is substantially constant, and the width dimension W1 in the front-rear direction of the mounting recess 39 is such that the width dimension W2 in the front-rear direction of the mounting piece 49 can be easily inserted (see FIG. 10). It is set slightly larger.

  Further, the bag body 21 of the embodiment is formed of a cloth material separate from the bag body 21 and is sewn to the front edge side of the peripheral edge portion 32 so as to extend forward from the front edge side of the peripheral edge portion 32. A triangular plate-like connecting cloth 42 is provided. The connecting cloth 42 includes attachment portions 43 on the front end (front end) side and the upper edge side in the vicinity of the base portion (rear end). The attachment portion 43 is attached and fixed to the inner panel 2 on the body 1 side using the attachment bracket 10 and the attachment bolt 11, similarly to the attachment portion 33, and the insertion hole 43 a through which the attachment bolt 11 can be inserted. Is provided.

  As shown in FIGS. 2 and 3, the inner tube 46 has a substantially cylindrical shape covering the inner peripheral side from the connection port portion 24 to the gas supply passage portion 23 in the bag main body 21, and the base portion 46 a (rear side) End) is made to coincide with the opening 24a of the connection port portion 24, and the front end 46b side is arranged at a position above the rear end of the protective main body portion 26 arranged on the front side. Specifically, the inner tube 46 is configured so that the tip 46 b is positioned above the partition part 36. Further, the inner tube 46 is arranged in the gas supply path 23 so that the lower edge 46 c side is supported by the plate-like portion 34 of the bag body 21. The inner tube 46 has a strip-like connecting piece 46e extending rearward on the base portion 46a side (see FIGS. 9 and 10). As shown in FIG. 7, the connecting piece 46e folded in half in the front-rear direction side. The base part 46a side is connected to the connection port part 24 side by sandwiching and connecting the connecting piece 24b extending rearward from the periphery of the opening 24a of the connection port part 24 in the bag body 21.

  The inner tube 46 is formed with a first gas outflow hole 48 and a second gas outflow hole 52 for allowing the inflation gas to flow out in the respective protection main body portions 26 and 27 in the bag main body 21.

  The first gas outflow hole 48 is formed in the inner tube 46 in a region of a tip portion 47 constituted by a region protruding forward from the plate-like portion 34 when stored in the bag body 21. In the case of the embodiment, the first gas outflow hole 48 is configured by a non-bonded (non-sewn) peripheral portion of the inner tube base fabric 54 described later. It is configured to be inclined rearward and downward with respect to the direction, and is disposed at a position substantially directly above the partition portion 36.

  In addition, at the tip portion 47 of the inner tube 46, an attachment piece portion 49 is formed so as to partially protrude upward on the upper edge 46d side in a state where the inner tube 46 is flatly developed. Specifically, the attachment piece 49 is formed slightly behind the first gas outflow hole 48, and has an outer shape of a substantially rectangular shape with a large width dimension in the front-rear direction. The attachment piece 49 is a portion that is inserted into the attachment recess 39 formed in the bag body 21 and is coupled to the attachment recess 39, and the width dimension W2 in the front-rear direction (see FIG. 10) is set to the bag body. 21 is set slightly smaller than the width dimension W1 of the mounting recess 39 in the front-rear direction. In addition, the mounting piece portion 49 has an upper edge from the opening 40 of the mounting recess 39 as shown in FIGS. 3 and 4 in a state where the vertical width W3 (see FIG. 10) is inserted into the mounting recess 39. The dimensions are set so as to project slightly upward. In the case of the embodiment, the attachment piece 49 is sewn using a suture together with the vehicle inner wall portion 22a and the vehicle outer wall portion 22b constituting the attachment recess 39 in a state of being inserted into the attachment recess 39. It is sewn (coupled) to the vehicle interior side wall portion 22a and the vehicle exterior wall portion 22b constituting the portion of the mounting recess 39. In the case of the embodiment, the stitching portion 50 for sewing the attachment piece portion 49 to the portion of the attachment recess 39 (the vehicle inner wall portion 22a and the vehicle outer wall portion 22b) is a straight line substantially along the front-rear direction. It is formed continuously so as to extend to the regions of the front and rear peripheral portions 32 (the front side portion 32af and the rear side portion 32ab in the upper side portion 32a). In other words, the suture part 50 is formed so as to close the entire area before and after the mounting recess 39 and close the opening 40.

  The second gas outflow hole 52 is formed in a region of the inner tube 46 that is disposed above the protective main body 27 on the rear side. Specifically, the second gas outflow hole 52 is formed at a position slightly behind the front and rear centers of the protective main body 27. In the case of the embodiment, the second gas outflow hole 52 has a substantially circular opening in the inner tube base fabric 54. It is formed. The opening area of the second gas outflow hole 52 is set smaller than that of the first gas outflow hole 48.

  Further, as shown in FIG. 10, the inner tube 46 according to the embodiment folds the inner tube base fabric 54 made of a woven fabric having flexibility, and uses a suture to wrap the corresponding peripheral edges. By sewing, it is formed in a substantially cylindrical shape. In the case of the embodiment, the inner tube base fabric 54 has an outer shape in which the lower edge side is connected.

  Next, the mounting of the head protection airbag device M of the embodiment on the vehicle V will be described. First, the inner tube 46 manufactured in advance is inserted into the bag body 21 manufactured by bag weaving. At this time, the attachment piece 49 formed at the distal end portion 47 of the inner tube 46 is inserted into the attachment recess 39 of the bag body 21 so as to be pulled out from the opening 40 of the attachment recess 39 formed in the bag body 21. Then, using the suture thread, the attachment piece 49 is sewn to the vehicle interior side wall portion 22a and the vehicle exterior wall portion 22b constituting the attachment recess 39, and the suture portion 50 is formed so as to close the opening 40. The tip end 47 side of the inner tube 46 is connected to the bag body 21. Next, the connecting piece 46e disposed on the base portion 46a side of the inner tube 46 and the connecting piece 24b formed on the connection port portion 24 in the bag body 21 are welded, and the base portion 46a side of the inner tube 46 is attached, The airbag 20 is manufactured by being connected to the periphery of the opening 24 a of the connection port 24 of the bag body 21.

  After that, the airbag 20 is folded so that the lower edge 21b side approaches the upper edge 21a side. When the folding is completed, the airbag 20 is wrapped with a wrapping material (not shown) for preventing collapse. Next, the attachment bracket 10 is attached to the attachment portion 33 formed on the upper edge 21 a side of the bag body 21 and the attachment portion 43 formed on the connecting cloth 42. The inflator 14 is inserted into the inner tube 46 from the small diameter portion 14b side, and is inserted into the connection port portion 24 of the bag body 21 from the opening 24a. The mounting bracket 16 is disposed on the outer peripheral side of the inflator 14 to connect the connection port 24 of the airbag 20 and the inflator 14 to form an airbag assembly.

  Thereafter, the mounting brackets 10 and 16 are disposed at predetermined positions on the inner panel 2 on the body 1 side, and are fixedly mounted using the mounting bolts 11 and 17, and the airbag assembly is mounted on the body 1. Next, a lead wire (not shown) extending from a predetermined control device for inflator operation is connected to the inflator 14, the front pillar garnish 4 and the roof head lining 5 are attached to the inner panel 2 on the body 1 side, and the rear pillar garnish 6 And the center pillar garnish 7 are attached to the inner panel 2 on the body 1 side, the head protection airbag device M can be mounted on the vehicle V.

  If the inflator 14 is activated after the head protection airbag device M is mounted on the vehicle V, the inflation gas G discharged from a gas discharge port (not shown) of the inflator 14 flows through the inner tube 46 to supply gas. The air passage 20 flows into the protective main body portions 26 and 27 of the bag main body 21 from the first gas outflow hole 48 and the second gas outflow hole 52 while the passage portion 23 is inflated. As shown by a two-dot chain line in FIG. 1, the airbag cover 8 constituted by the lower edge of the lining 5 is pushed open and protrudes downward, while the windows SW1 and SW2, the center pillar portion CP, and the rear pillar portion RP It will expand greatly to cover the inside of the car.

  In the head protection airbag device M of the embodiment, the inner tube 46 is attached to the front end portion 47 side which is one end side in the front-rear direction (the front end side in the embodiment) using the attachment piece 49. Since it is connected to the main body 21, when the inflation gas G flows out from the first gas outflow hole 48 into the bag main body 21 during the operation of the inflator 14, the portion on the tip end 47 side is greatly shaken. It can be accurately suppressed. For this reason, it is possible to accurately suppress the vicinity of the first gas outflow hole 48 through which the inflation gas flows out into the bag body 21. In particular, in the embodiment, since the first gas outflow hole 48 is disposed in the region of the tip portion 47 connected to the bag body 21 side by the attachment piece portion 49, the vibration at the time of inflating the expansion gas outflow, The attachment piece portion 49 can suppress more accurately. Further, in the head protecting airbag device M of the embodiment, the inner tube 46 contracts the length dimension toward the distal end portion 47 side by the inflation gas flowing into the bag body 21 during the inflation of the airbag 20. Even if it receives such a force, since the inner tube 46 is connected to the bag body 21 using the attachment piece 49 on the distal end portion 47 side, the inner tube 46 contracts to reduce the length dimension. Can be accurately suppressed, and the position of the first gas outlet hole 48 with respect to the bag body 21 when the inflation gas flows out can be stabilized.

  Furthermore, in the head protection airbag apparatus M of the embodiment, the inner tube 46 has the attachment piece portion 49 inserted into the attachment recess portion 39 formed in the bag body 21, and the attachment piece portion 49 is inserted into the portion of the attachment recess portion 39 ( By connecting to the vehicle inner wall portion 22a and the vehicle outer wall portion 22b), the portion on the tip portion 47 side is connected to the bag body 21. Therefore, the arrangement position of the front end portion 47 with respect to the bag main body 21 can be stabilized, and the arrangement position of the first gas outflow hole 48 in the bag main body 21 hardly occurs for each airbag 20. In particular, in the head protection airbag device M of the embodiment, the first gas outflow hole 48 is formed in the region of the tip portion 47, and the inner tube 46 is provided in the bag body 21 that has been formed in advance. Since the mounting piece 49 is attached to the mounting recess 39 by being inserted, the arrangement position of the first gas outflow hole 48 in the bag body 21 can be made substantially constant. As a result, the airbag 20 can be manufactured with good accuracy of the arrangement position of the first gas outflow hole 48 in the bag body 21.

  Furthermore, in the head protection airbag device M of the embodiment, the mounting recess 39 of the bag body 21 to which the mounting piece 49 is attached has at least the upper and lower sides 32a (front side portion) of the peripheral edge 32 that is the non-inflow portion 31 on both front and rear sides. 32af, the rear part 32ab). That is, in the head protection airbag device M of the embodiment, in the bag body 21, in the vicinity of the attachment recess 39, the front part 32 af and the rear part 32 ab in the upper part 32 a straddle the attachment recess 39 along the front-rear direction. Since it is connected linearly, the expansion | swelling site | part (protection main-body part 26) adjacent to the attachment recessed part 39 will expand | swell so that an edge may be linearly arrange | positioned along the front-back direction. Therefore, when the bag body 21 is inflated, it is possible to suppress a large tension from acting on the region where the attachment piece portion 49 is attached. As in the embodiment, the attachment piece portion 49 is attached to a portion of the attachment recess 39 using a suture thread. Even when it is configured to be sewn to (the vehicle interior side wall portion 22a and the vehicle exterior side wall portion 22b), the occurrence of gas leakage from the vehicle interior side wall portion 22a and the vehicle exterior side wall portion 22b at the periphery of the stitched portion 50 can be suppressed as much as possible. . Furthermore, in the head protection airbag device M of the embodiment, the inner tube 46 is coupled to the bag body 21 side only at the portion of the attachment piece portion 49 disposed on the distal end portion 47 side. The airbag 20 can be folded compactly and can be smoothly mounted even if the space on the upper edge side of the window is narrow.

  Therefore, in the head protection airbag device M according to the embodiment, the airbag can be mounted without being bulky, and the gas inflow hole (first gas outflow hole 48) formed in the inner tube 46 is within the bag body 21. The accuracy of the arrangement position can be improved, and the position of the distal end portion 47 of the inner tube 46 during operation can be stabilized.

  Further, in the head protection airbag device M of the embodiment, the attachment piece portion 49 is formed on the upper edge 46d side of the inner tube 46 in a flatly deployed state, and is a peripheral edge that becomes the upper edge 21a side of the bag body 21 In the mounting recess 39 disposed in the upper portion 32 a of the portion 32, the mounting piece 49 of the inner tube 46 inserted into the bag body 21 is placed at a position on the upper edge 21 a side of the bag body 21. An opening 40 that can be gripped from the outside is formed. Therefore, in the head protection airbag apparatus M of the embodiment, when the inner tube 46 is housed in the bag body 21, the attachment piece 49 is gripped by hand and pulled out from the opening 40 so as to be attached. Since it can be stored in the recess 39, the mounting work of the mounting piece 49 in the mounting recess 39 is facilitated, and the positioning of the inner tube 46 with respect to the bag body 21 can be performed more accurately. In particular, in the embodiment, the mounting piece 49 is configured to protrude slightly upward from the opening 40 in a state where the mounting piece 49 is housed in the mounting recess 39. The storing operation into the mounting recess 39 is easier.

  Of course, if such a point is not taken into consideration, the mounting piece portion is formed on the lower edge side of the inner tube in a flatly developed state, and the mounting concave portion corresponds to the mounting piece portion of the inner tube of the bag body. You may form so that the plate-shaped part (supporting coupling | bond part) which supports a lower edge side may be dented. Further, when the attachment piece is provided on the upper edge side of the inner tube and the attachment recess is formed on the upper edge side of the bag body, an opening may not be provided on the upper edge side of the attachment recess.

  Furthermore, in the head protection airbag device M of the embodiment, the inner tube 46 is joined to the bag body 21 side by the attachment piece portion 49 on the distal end portion 47 side. Even if the connection port portion 24 is disposed on the rear end side of the gas supply passage portion 23 and the inflator 14 is connected to the connection port portion 24, the gas supply path portion 23 is separated from the inflator 14 during operation. The tip end 47 side of the inner tube 46 can be prevented from swaying in the vertical direction, and the inflation gas can be stably discharged from the first gas outflow hole 48 formed in the tip portion 47. Therefore, in the head protection airbag device M of the embodiment, the length dimension on the front-rear direction side of the support coupling portion (plate-like portion 34) that supports the lower portion of the inner tube 46 can be relatively shortened. . Specifically, in the airbag 20 (bag main body 21) of the embodiment, the gas supply path portion 23 and the front region of the protective main body portion 27 are partitioned by extending rearward from the rear upper edge side of the plate-like portion 34. The partition part 57 (refer to the two-dot chain line in FIG. 3) is not provided. Such a partition portion 57 is provided with a conventional air bag in order to suppress shaking of the inner tube 46 during operation (particularly, a phenomenon in which the inner tube 46 is drawn backward and enters the protective body 27). Was provided. That is, in the airbag 20 of the head protection airbag device M of the embodiment, before and after the communication portion with the gas supply path portion 23 of the protection main body portion 27 disposed on the rear side of the plate-like portion 34 (support coupling portion). It is possible to ensure a wide width dimension. Therefore, as shown in FIG. 8, the protective main body 27 can be expanded thickly so as to be integrally expanded from the position where the inner tube 46 is disposed (the gas supply passage 23) to the lower edge of the protective main body 27. In addition, since a region that expands integrally from the gas supply path 23 to the protective main body 27 can be secured widely in the front and rear, the protective main body 27 that has completed the expansion protects the occupant's head with good cushioning properties. can do. Of course, if such a point is not taken into consideration, a partition portion 57 as shown by a two-dot chain line in FIG. 3 may be provided in the bag body.

  In the head protection airbag device M of the embodiment, the gas outflow hole (first gas outflow hole 48) formed in the distal end portion 47 of the inner tube 46 is slightly distal (front side) from the attachment piece portion 49. However, the arrangement position of the attachment piece and the gas outflow hole is not limited to the embodiment. For example, the attachment piece portion and the gas outflow hole may be arranged at positions substantially coincided with each other in the front end portion in the region of the front end portion. You may arrange | position in the position which becomes a little rear side from a part. Further, in the head protection airbag apparatus M of the embodiment, the gas outflow hole (first gas outflow hole 48) is formed in the front end portion 47 on the front end side of the inner tube 46. The arrangement position is not limited to the embodiment, and only the attachment piece portion may be arranged at the tip portion, and the gas outflow hole may be arranged in a region away from the tip portion.

  Further, in the embodiment, the attachment piece portion is joined to the attachment recess portion by sewing with a suture thread. However, as a coupling means for joining the attachment piece portion to the attachment recess portion, there is a sewing means. For example, the attachment piece portion may be bonded to the attachment recess portion with an adhesive. However, if sewing is performed using a suture thread, the attachment piece, the vehicle interior side wall portion and the vehicle exterior wall portion constituting the attachment recess can be sewn (coupled) by a single sewing operation. Therefore, the joining operation is easy and preferable.

  Furthermore, in the embodiment, as the airbag, a connection port portion connected to the inflator is used on the rear end side of the gas supply passage portion. However, an air bag to which the present invention can be applied is used. The bag is not limited to the embodiment, and the present invention can also be applied to an airbag having a configuration in which the connection port portion protrudes upward from the middle before and after the gas supply path portion. is there. Furthermore, in the embodiment, a head protection airbag device using a bag-woven airbag is described as an example. However, the present invention allows a base fabric having a predetermined shape to be sewn together using a suture thread. The present invention can also be applied to a head protection airbag device using a suture bag formed in this manner.

14 ... Inflator,
20 ... Airbag,
21 ... Bag body,
22: Gas inflow part,
22a ... the inner wall of the vehicle,
22b ... the outer wall of the vehicle,
23: Gas supply passage,
24 ... Connection port,
26, 27 ... protection body,
31 ... non-inflow part,
32 ... peripheral part,
32a ... upper part,
34 ... plate-like part (supporting joint part),
39: Mounting recess,
40 ... opening,
46 ... Inner tube,
47 ... the tip,
48 ... 1st gas outflow hole (gas outflow hole),
49 ... Mounting piece,
52 ... second gas outflow hole,
V ... Vehicle,
SW1, SW2 ... windows,
M: Head protection airbag device.

Claims (4)

An airbag that is folded and housed on the upper edge side of a window inside the vehicle; and an inflator that is disposed on the upper edge side of the window and supplies inflation gas to the airbag.
The airbag is configured to include a bag main body, and an inner tube that is disposed in the bag main body and guides the inflation gas discharged from the inflator into the bag main body,
The inner tube has a substantially cylindrical shape and is arranged along the front-rear direction on the upper edge side of the bag body at the completion of inflation, and includes a gas outflow hole for allowing the inflation gas to flow out into the bag body. A head protection airbag device having a configuration,
The bag body is configured to include an inflow portion that expands by inflating an inflating gas and a non-inflow portion that does not allow the inflating gas to flow inside,
The inner tube has a mounting piece portion formed so as to partially protrude from the upper edge in a flatly deployed state,
The bag body is configured to include an attachment recess into which the attachment piece portion can be inserted on the upper edge side of the outer periphery,
The mounting recess has a front side portion and a rear side portion of the upper side portion, which are the non-inflow portions, on the front side and the rear side, respectively, and between the front side portion and the rear side portion. Configured with an opening,
The opening is configured to be able to grip the attachment piece portion of the inner tube in a state of being inserted into the bag body from outside the bag body,
The front Symbol mounting piece portion of the inner tube, while being inserted into the mounting recess, and close the opening, and, by sewing portion extend to an area between the rear portion and the front portion, said coupled to the site of mounting recesses, before Symbol head protection air bag device characterized by being connected to the bag body. The head protection airbag device according to claim 1, wherein the front side portion and the rear side portion are linearly connected along the front-rear direction across the mounting recess. The head protection airbag device according to claim 1 , wherein the attachment piece portion is formed in a region of a tip portion that is one end side in the front-rear direction of the inner tube. The bag body is formed from a bag weave;
The gas inflow part is
A plurality of protective body parts arranged in parallel along the front-rear direction when the expansion is completed;
On the upper edge side at the time of completion of expansion, the gas supply path portion is arranged extending substantially along the front-rear direction, and guides the expansion gas discharged from the inflator to the protection main body portions, and
A connection port portion formed so as to protrude from the rear end side of the gas supply path portion so as to be continuous with the gas supply path portion, and to be openable on the rear end side so that the inflator can be inserted,
With
The inner tube is configured to cover an inner peripheral side from the connection port portion to the gas supply path portion in the bag body, and the attachment piece portion is disposed on an upper edge side of the tip portion. The gas outflow hole is disposed in a position where the inflating gas can flow out to the protection main body side disposed on the front side in the region of the front end portion, and the protection main body side disposed on the rear side And a second gas outflow hole for allowing the expansion gas to flow out,
On the lower edge side of the gas supply path portion in the bag body, a support coupling portion configured from the non-inflow portion and supporting the lower portion of the inner tube is formed,
Each of the protective body portions is configured to be communicated with the gas supply path portion on the front side and the rear side of the support coupling portion, respectively, so that the inflation gas flows into the inside. The head protection airbag device according to any one of claims 1 to 3.

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