JP2011230645A - Head protective airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head protective airbag device with a simple constitution allowing improvement of durability of an inner tube arranged in a bag body.SOLUTION: In this head protective airbag device, an airbag 25 includes a bag body 26 and the inner tube 51. The bag body 26 includes a gas supply passage part 28 and a connecting part 30 for inserting an inflator formed to be projected from one end side of a longitudinal direction of the gas supply passage part 28. The inner tube 51 is formed into a substantially cylindrical shape for covering an inner peripheral side from the connecting part 30 to the gas supply passage part 28 in the bag body 26. The inner tube 51 is formed into the substantially cylindrical shape by folding foundation cloth 61 for the inner tube 51 into two and mutually sewing the corresponding peripheral edges. In the inner tube 51, an inner diameter dimension of a discharge port cover part 52 for covering an outer peripheral side of a gas discharge port is set to be larger than that of a portion 54 on an opening side for inserting the inflator.

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.

  2. Description of the Related Art Conventionally, as a head protection airbag device, an airbag has a bag body and an inner tube disposed in the bag body, and the inner tube is inserted for inserting an inflator in the bag body. There is a configuration that covers the inner peripheral side from the substantially cylindrical connecting portion having the opening to the gas supply path portion. And the inner tube was formed in the substantially cylindrical shape by folding the inner tube base fabric in half and sewing the corresponding peripheral edges using a suture thread. Further, in this conventional head protection airbag device, the inflator has a substantially cylindrical outer shape, and extends in the circumferential direction from the insertion opening to the distal end side inserted into the bag body through the inner tube. It was set as the structure provided with several gas discharge ports along (for example, refer patent document 1).

  In the conventional head protection airbag device, when the inflator is activated, the high-pressure inflation gas is ejected radially from the gas discharge port around the axis of the inflator. In order to prevent hitting the stitched portion formed in the tube, a protective cloth that covers the outer peripheral side of the gas discharge port of the inflator over the entire circumference has been arranged inside the inner tube. This protective cloth is stitched together with the inner tube at one end side to the inner tube and wound around the inflator in a spiral shape with the other end side as the free end. Covering the inner peripheral side, the expansion gas was prevented from hitting the suture site, and the durability of the inner tube was improved.

Special table 2008-531384 gazette

  However, in the conventional head protection airbag device, it is necessary to arrange a protective cloth separate from the inner tube on the inner peripheral side of the inner tube, and it is also necessary to wrap this protective cloth around the outer peripheral side of the inflator Therefore, the configuration is not simple, and there is room for improvement in terms of reducing manufacturing steps and costs.

  This invention solves the above-mentioned subject, and provides the head protection airbag apparatus which can improve durability of the inner tube arrange | positioned in a bag main body as a simple structure. With the goal.

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 disposed in the bag body,
The bag body
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 substantially cylindrical connecting part formed so as to protrude from one end side in the front-rear direction of the gas supply path part and connected to the gas supply path part, and having an insertion opening for inserting an inflator,
With
In the bag body, the inner tube has a substantially cylindrical shape covering the inner peripheral side from the connecting portion to the gas supply path portion,
The inflator
The outer shape is substantially cylindrical, and is configured to include a plurality of gas discharge ports along the circumferential direction from the insertion opening to the distal end side that is inserted into the bag body via the inner tube.
In a state where the gas discharge port side is inserted into the bag body, by tightening a clamp disposed on the outer peripheral side of the connecting portion, it is configured to be connected to the connecting portion via the inner tube,
The inner tube is formed into a substantially cylindrical shape by folding a base fabric for inner tube made of a woven fabric having flexibility, and sewing the corresponding peripheral edges with each other. In the head protection airbag device having a configuration in which a plurality of gas outflow holes through which the inflating gas can flow out to the protective body portion side are arranged side by side in the front-rear direction.
The inner tube
In the stitching site where the peripheral edges of the inner fabric for the inner tube are sewn together, in order to increase the separation distance from the inflator in the direction orthogonal to the axis of the inflator, the portion arranged in the outer peripheral side region of the gas discharge port,
The inside diameter dimension of the discharge port cover part which covers the outer peripheral side of a gas discharge port is set larger than the inside diameter dimension of the site | part by the side of the insertion opening.

  In the head protecting airbag device of the present invention, the inner tube is formed in a substantially cylindrical shape by folding the inner tube base fabric in half and stitching the corresponding peripheral edges together. The inner diameter dimension of the discharge port cover portion covering the outer peripheral side of the outlet is set larger than the inner diameter dimension of the portion on the insertion opening side. And in the head protection airbag device of the present invention, the portion arranged in the region on the outer peripheral side of the gas discharge port at the peripheral stitching portion of the inner tube base fabric is from the inflator in the axis orthogonal direction of the inflator. The separation distance is set large. That is, in the head protection airbag device of the present invention, the suture site formed in the inner tube is inflated so as to be separated from the inflator in the vicinity of the gas discharge port in the inflator. Even when the expansion gas is ejected radially, the suture gas at the suture site, etc., in which the expansion gas ejected from the gas ejection port is placed in a region on the outer peripheral side of the gas ejection port in a high pressure state, etc. Can be suppressed. Therefore, in the head protection airbag device of the present invention, an inflator capable of discharging a large amount of inflation gas is used to inflate a large-capacity bag body in which a plurality of protection body portions are arranged in parallel in the front-rear direction. Even if it uses, it can suppress that the stitching site | part formed in an inner tube receives damage with the gas for expansion | swelling, and can improve the durability of an inner tube. Further, in the head protection airbag device of the present invention, the durability of the inner tube can be improved only by changing the shape of the stitched portions between the peripheral edges of the inner tube base fabric (in other words, the outer shape of the inner tube base fabric). As compared with a conventional head protection airbag device in which a separate protective cloth is provided, the configuration can be simplified and the number of manufacturing steps and costs can be reduced.

  Therefore, in the head protection airbag device of the present invention, the durability of the inner tube disposed in the bag body can be improved with a simple configuration.

  Further, in the head protection airbag device of the present invention, if the inner diameter dimension of the portion of the inner tube located on the distal end side from the discharge port cover part is set smaller than the inner diameter dimension of the discharge port cover part, the airbag is inflated and expanded. Sometimes, in the inner tube, it can be secured high without lowering the flow rate of the inflation gas flowing inside the tip side of the discharge port cover part, and the protective main body part arranged at a position away from the inflator can also be quickly It can be expanded, which is preferable.

  Furthermore, in the head protection airbag device having the above-described configuration, the inner tube is configured by forming the discharge port cover portion and the remaining general portion from different base fabrics, and the base fabric forming the discharge port cover portion. In addition, if the heat resistance is improved over the base fabric constituting the general part, even if the expansion gas discharged from the gas discharge port of the inflator is at a high temperature, the discharge port cover part itself is damaged. Can be suppressed, and the durability of the inner tube can be further improved, which is preferable.

  Furthermore, in the head protection airbag device having the above-described configuration, if the inner tube is configured such that the sutured portion is disposed on the upper edge side, a gas outflow hole for allowing the inflation gas to flow out into each protective main body is provided for the inner tube. It is only necessary to cut out the base fabric, and the accuracy of the inner diameter dimension of each gas outflow hole is stabilized compared with the case where the stitching site is arranged on the lower edge side and the gas outflow hole is formed by dividing the stitching site. Can be preferable.

  Furthermore, in the head protection airbag device having the above configuration, an enlarged portion that can accommodate the discharge port cover portion of the inner tube is connected to the region extending from the upper edge side of the connecting portion in the bag body and extending in the front-rear direction. If the upper edge is recessed and formed, the discharge port cover portion is inflated without being restricted by the upper edge portion of the bag body disposed on the outer peripheral side when the inflator is activated. As a result, the separation distance between the suture part arranged in the region of the discharge port cover part and the inflator can be secured as much as possible, and the suture part formed in the inner tube is damaged by the inflation gas. Can be prevented as much as possible.

  Further, in the head protection airbag device having the above-described configuration, the inner tube may be housed in the bag body so that the site on the suture site side in the discharge port cover portion is folded downward. In the region of the discharge port cover portion, the suture site is hidden by the folded fold of the discharge port cover portion and is not exposed, so the inflation gas does not directly hit the suture site, and the suture site is It is preferable because it can be surely prevented from being damaged by the expanding gas.

  Furthermore, in the head protection airbag device of the present invention, the bag body is preferably manufactured by bag weaving.

It is a schematic front view which shows the vehicle mounting state of the head protection airbag apparatus which is one Embodiment of this invention. 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 in the vicinity of a connecting portion in the airbag of FIG. 2. It is sectional drawing of the IV-IV site | part in FIG. It is sectional drawing of the VV site | part in FIG. It is a front view of the state which unfolded flat the bag main part used for the airbag of FIG. FIG. 3 is a front view of a state in which an inner tube used in the airbag of FIG. 2 is flatly deployed. It is sectional drawing of the VIII-VIII site | part in FIG. It is sectional drawing of the IX-IX site | part in FIG. In the head protection airbag device of an embodiment, it is the outline longitudinal section along the front-and-rear direction which shows the connection part neighborhood of the connecting part of an airbag, and an inflator. It is a schematic sectional drawing which shows the XI-XI site | part vicinity in FIG. It is a partial enlarged front view which shows the connection part vicinity of the airbag of the other form in this invention. It is sectional drawing of the XIII-XIII site | part in FIG. It is a schematic longitudinal cross-sectional view along the front-back direction which shows the connection part vicinity of the state which connected the connection part and inflator of the airbag of FIG. It is a schematic sectional drawing which shows the XV-XV site | part vicinity in FIG.

  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 the vehicle V, and includes an airbag 25, an inflator 14, mounting brackets 10 and 19, and an airbag cover 8. In the case of the embodiment, the airbag 25 ranges 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 SW1 and SW2 of the vehicle V. And is expanded and expanded 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 10, the inflator 14 is a cylinder type whose outer shape is a substantially cylindrical shape, and a substantially cylindrical main body 15 that is arranged with the axial direction approximately along the front-rear direction, and the tip of the main body 15. It is set as the structure provided with the small diameter part 16 arrange | positioned at the side (in the case of embodiment, the front end side) and made smaller diameter than the main body 15. The small-diameter portion 16 is formed with a plurality of gas discharge ports 16a that discharge the inflation gas radially about the axis of the inflator 14 along the circumferential direction. Further, in the case of the embodiment, the inflator 14 is configured as a hybrid type, in which a high-temperature and high-pressure inflation gas is ejected radially from the gas discharge ports 16a during operation. The inflator 14 has an outer periphery of the connecting portion 30 of the bag body 26 in a state in which the gas discharge port 16a side (small diameter portion 16 side) is inserted into the bag body 26 (gas supply path portion 28) of the airbag 25. It is connected with the connecting part 30 by tightening a clamp arranged on the side. In the case of the embodiment, the retaining ring portion 20F of the mounting bracket 19F that attaches the inflator 14 to the inner panel 2 on the vehicle body 1 side constitutes a clamp that connects the inflator 14 and the connecting portion 30 together.

  The mounting bracket 19 is made of sheet metal, a holding ring portion 20 in which a band-like member is bent in a substantially annular shape so as to be arranged around the main body 15 in the inflator 14, and a substantially square formed on both ends of the holding ring portion 20. It is comprised from two plate-shaped attachment board parts 21A and 21B. In the case of the embodiment, the mounting brackets 19 are disposed at two locations along the axial direction of the inflator 14 (see FIG. 1). In the case of the embodiment, as shown in FIG. 10, the holding ring portion 20 </ b> F of the mounting bracket 19 </ b> F disposed on the front side constitutes a clamp that connects the inflator 14 and the connecting portion 30. 19F is disposed in the main body 15 of the inflator 14 in a region slightly rearward from the small diameter portion 16. The mounting plate portions 21A and 21B in each mounting bracket 19 (19F and 19B) have through holes 21a through which mounting bolts 22 for fixing the mounting bracket 19 (19F and 19B) to the inner panel 2 on the body 1 side can be inserted. It is formed (see FIG. 10).

  Each mounting bracket 19 (19F, 19B) is configured such that the retaining ring portion 20 is arranged on the outer peripheral side of the main body 15 of the inflator 14 so that the mounting plate portions 21A, 21B are overlapped with each other in the vehicle interior / exterior direction. In the mounting bracket 19F disposed on the front side, the retaining ring portion 20F is disposed on the outer peripheral side of the main body 15 of the inflator 14 via the connecting portion 30 of the airbag 25 as shown in FIG. It will be. And if the mounting plate part 21B arrange | positioned on the vehicle outer side is contacted to the inner panel 2, and the mounting bolt 22 inserted through the through hole 21a is fastened to a nut (not shown) fixed to the inner panel 2, The inflator 14 can be attached to the inner panel 2. At this time, in the mounting bracket 19F on the front side, when the mounting bolt 22 is fastened to the nut, the holding ring portion 20F as a clamp is tightened from the outer peripheral side of the connecting portion 30, and the main body 15 of the inflator 14 and the air The connection part 30 of the bag 25 will be connected. In the case of the embodiment, 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 41 and 48, which will be described later, of the airbag 25 to the inner panel on the body 1 side is composed of two sheet metal plates. 48 is attached to each attachment portion 41, 48 so as to sandwich the 48, and each attachment portion 41, 48 is attached and fixed to the inner panel 2 using the attachment bolt 11.

  The airbag 25 is provided with the bag main body 26 and the inner tube 51 arrange | positioned in the bag main body 26, as shown to FIGS.

  As shown in FIG. 1, the bag body 26 is located on the upper edge side of the windows SW1 and SW2 of the vehicle V from the lower edge side of the front pillar portion FP through the lower edge side of the roof side rail portion RR and above the rear pillar portion RP. In the range up to, it is folded and stored. Specifically, the bag body 26 bends at a portion near the rear end (near a boundary portion between a connecting portion 30 and a gas supply passage portion 28 described later) so that the inflator 14 is inclined slightly rearwardly downward with respect to the horizontal direction. It is mounted on the vehicle V (see FIG. 1). The inclination of the inflator 14 is omitted in FIG.

  Then, the bag body 26 flows in the inflation gas G from the inflator 14 and expands from the folded state, and as shown by the two-dot chain line in FIG. 1, the vehicle of 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 arranged on the inner side and the inner side of the rear pillar garnish 6 arranged on the inner side of the rear pillar part RP. The bag body 26 is manufactured by bag weaving using polyamide yarn, polyester yarn or the like. As shown in FIGS. 2, 3 and 6, the bag body 26 is used for expansion between the vehicle inner wall portion 27a and the vehicle outer wall portion 27b. A gas inflow portion 27 that expands by inflowing gas, and a non-inflow portion 39 that is configured to couple the vehicle inner wall portion 27a and the vehicle outer wall portion 27b and does not allow the expansion gas to flow therein. Yes. In the case of the embodiment, the bag body 26 is coated on the entire outer surface side with a coating agent made of silicon or the like for preventing gas leakage.

  In the case of the embodiment, the gas inflow portion 27 includes a gas supply path portion 28, a connecting portion 30, and two protective main body portions 33 and 35 that are arranged in front and rear.

  The gas supply passage portion 28 is disposed so as to extend substantially along the front-rear direction so as to extend along the front-rear direction of the vehicle V on the upper edge 26 a side when the expansion of the bag body 26 is completed, and is discharged from the inflator 14. The expansion gas G is guided to the protection main body portions 33 and 35 disposed below the gas supply path portion 28. In the case of the embodiment, the gas supply path portion 28 is disposed over substantially the entire region before and after the bag body 26. The connecting portion 30 is formed so as to project rearward from the rear end 28a side of the gas supply passage portion 28 so as to be continuous with the gas supply passage portion 28, and an insertion opening 31 for inserting the inflator 14 is provided at the rear end. It is configured as a substantially cylindrical shape disposed on the side. As shown in FIG. 3, the connecting portion 30 has a lower edge 30b side positioned below an upper edge 42a of a plate-like portion 42, which will be described later, constituting the lower edge of the gas supply passage portion 28. It is configured to communicate with the gas supply path section 28 at a position lowered one step below the supply path section 28. Further, the connecting portion 30 has an inner diameter dimension (width dimension W1 in a flatly developed state) corresponding to a connecting side portion 54 on the side of the insertion opening 31 in the inner tube 51 to be described later. It is set to be smaller than the inner diameter dimension (width dimension W2 in a state of flat development) (see FIG. 6). That is, the connecting portion 30 is configured so that the upper edge 30a is positioned largely below the upper edge of the gas supply path portion 28 (the upper edge 26a of the bag body 26). In other words, the bag body 26 has a region extending from the upper edge 30a side of the connecting portion 30 and extending in the front-rear direction (a portion on the connecting portion 30 side in the gas supply path portion 28 (a portion on the rear end 28a side)). An enlarged portion 29 that protrudes upward with respect to the connecting portion 30 is formed so that the upper edge 26a of the main body 26 is recessed upward (see FIGS. 3 and 6). The enlarged portion 29 is configured to be able to accommodate the protruding portion 52 a of the discharge port cover portion 52 of the inner tube 51.

  The protective main body 33 is a portion that is disposed on the side of the front seat when the expansion of the bag main body 26 is completed. The protective main body 33 is divided into two parts by a partition 44 that extends upward from the lower edge side of the bag main body 26. The front end portion is partitioned from the gas supply path portion 28 by a partition portion 43 extending rearward from the front edge side of the bag body 26. The protective main body 35 is a portion that is disposed on the side of the rear seat when the bag main body 26 is completely inflated. Further, in the bag body 26 of the embodiment, from the rear lower end of the protective main body 33 to the vicinity of the front end of the protective main body 35 along the front-rear direction on the lower edge side of the bag main body 26 between the protective main body portions 33 and 35. A lateral expansion portion 36 that extends and is closed on the rear end side with respect to the protection main body portion 35 is formed. The lateral expansion portion 36 is configured such that the front end side is communicated with the protection main body portion 33 and the expansion gas G flows into the inside through the protection main body portion 33.

  In the case of the embodiment, the non-inflow portion 39 includes a peripheral edge portion 40, an attachment portion 41, a plate-like portion 42, and partition portions 43, 44, and 45.

  The peripheral edge portion 40 is formed so as to surround the periphery of the gas inflow portion 27 in the bag body 26 over the entire circumference except for the portion of the insertion opening 31. The attachment portion 41 is formed so as to extend upward from a portion on the upper side of the peripheral edge portion 40 disposed on the upper edge 26a side of the bag body 26, and a plurality of locations (in the case of the embodiment, 6 in the embodiment). ). The mounting portion 41 is a portion for connecting the upper edge 26a side of the bag body 26 to the body 1 side of the vehicle V and connecting and fixing the airbag 25 to the body 1 side. An insertion hole 41a through which a mounting bolt 11 for fixing to the inner panel 2 on the side can be inserted is provided. Each attachment portion 41 is attached and fixed to the inner panel 2 using the attachment bracket 10 and the attachment bolt 11. The plate-like portion 42 is disposed between the protection main body portions 33 and 35 which are below the gas supply path portion 28 and above the lateral expansion portion 36, and have an outer shape of a substantially rectangular shape. Has been.

  The partition portion 43 is formed substantially along the front-rear direction so as to extend rearward from the front edge side portion of the peripheral edge portion 40, and includes the gas supply path portion 28 and the region on the front side of the protection main body portion 33. It is partitioned. The partition portion 44 is formed substantially along the vertical direction so as to extend upward from a portion on the lower edge side of the peripheral edge portion 40 in the region of the protection main body portion 33. The partition portion 45 is formed substantially along the front-rear direction so as to extend rearward from a position slightly above the upper and lower centers of the plate-like portion 42 in the region of the protection main body portion 35.

  In addition, the bag body 26 of the embodiment is formed of a cloth material separate from the bag body 26 and is sewn to the front edge side of the peripheral edge portion 40 so as to extend forward from the front edge side of the peripheral edge portion 40. A triangular plate-like connecting cloth 47 is provided. The connecting cloth 47 includes attachment portions 48 on the front end (front end) side and the upper edge side in the vicinity of the base portion (rear end). Similar to the mounting portion 41, the mounting portion 48 is fixed to the inner panel 2 on the body 1 side using the mounting bracket 10 and the mounting bolt 11, and the insertion hole 48 a through which the mounting bolt 11 can be inserted. Is provided.

  As shown in FIG. 2, the inner tube 51 has a substantially cylindrical shape covering the inner peripheral side from the connecting portion 30 to the gas supply path portion 28 in the bag body 26. In the case of the embodiment, the inner tube 51 has the base portion 51a (rear end) aligned with the insertion opening 31 of the connecting portion 30, and the front end 51b (front end) side is the rear end of the protective main body portion 33 disposed on the front side. It is comprised so that it may arrange | position in the position used as the upper side of. Further, the inner tube 51 is disposed in the gas supply path portion 28 so that the lower edge 51 c side is supported by the plate-like portion 42 of the bag body 26. In the case of the embodiment, the inner tube 51 includes a discharge port cover portion 52 that covers the outer peripheral side of the gas discharge port 16a (small diameter portion 16) of the inflator 14, and the remaining general portion 53. The general portion 53 includes a connection side portion 54 disposed on the rear side (original portion side) of the discharge port cover portion 52 and a gas guide portion 55 disposed on the front side (front end side) of the discharge port cover portion 52. It is configured. The connecting side portion 54 is a portion that is disposed on the inner peripheral side of the connecting portion 30 and is clamped together with the connecting portion 30. The gas guide part 55 is a part that guides the expansion gas discharged from the inflator 14 to the protection main body parts 33 and 35.

  The discharge port cover portion 52 has a substantially cylindrical shape covering the entire circumference around the small diameter portion 16 in the inflator 14, and has an inner diameter dimension (width dimension W3 in a flatly deployed state) at the completion of expansion, as shown in FIG. The inner diameter dimension (width dimension W4 in a flatly developed state) of the connecting side part 54 located on the insertion opening 31 side (original part side) is set. In the case of the embodiment, as shown in FIG. 7, the gas guide portion 55 located at the tip of the discharge port cover portion 52 has an inner diameter dimension (width dimension W5 in a flatly developed state), and the discharge port cover portion 52. The diameter is made smaller, and is configured to be slightly larger than the inner diameter dimension (width dimension W4 in a flatly developed state) of the connecting side portion 54. In the case of the embodiment, the discharge port cover portion 52 is configured so that the width dimension W <b> 3 is about 3/2 times the width dimension W <b> 4 of the connection side portion 54. Further, in the case of the embodiment, the discharge port cover portion 52 includes a protruding portion 52a that protrudes upward so that the upper edge side is positioned above the surrounding connecting side portion 54 and the gas guide portion 55. Yes. Further, the discharge port cover portion 52 has a length dimension L1 (see FIG. 7) in the front-rear direction side so that the front and rear sides of the gas discharge port 16a (small diameter portion 16) of the inflator 14 can be covered widely. Is set to about five times the length L2 (see FIG. 10).

  The inner tube 51 is disposed in the bag body 26 so that the region of the upper edge side protruding portion 52 a in the discharge port cover portion 52 is accommodated in the enlarged portion 29 of the gas supply passage portion 28 in the bag body 26. The Rukoto. Further, in the case of the embodiment, since the bag body 26 is configured to position the connecting portion 30 slightly below the gas supply path portion 28, the inner tube 51 is configured to be a gas as shown in FIG. The guide portion 55 is formed in a region corresponding to the bag main body 26 and above the protective main body portion 35 so that a gap is provided between the guide portion 55 and the peripheral edge portion 40, and the bag 55 is slightly inclined upward. It is inserted into the gas supply path portion 28 of the main body 26. In the embodiment, the inner tube 51 is provided with a gap between the inflator 14 side portion (upstream side portion) of the gas guide portion 55 and the peripheral edge portion 40 of the bag body 26, so that the bag body 26, when the airbag 25 is filled with the inflation gas discharged from the gas discharge port 14a in the early stage of inflation of the airbag 25, the peripheral edge portion 40 is inserted into the gas supply passage portion 28. It can suppress that the site | part of the vicinity receives damage with the gas for expansion | swelling. In the state where the inner tube 51 is flatly developed as a single unit, as shown in FIG. 7, the inner tube 51 is formed in a substantially linear shape across the entire front and rear without being partially inclined.

  Further, the inner tube 51 has gas outflow holes 56 and 57 through which the expansion gas can flow out to the respective protection main body portions 33 and 35 on the lower edge 51c side in the region of the gas guide portion 55 along the front-rear direction. They are arranged side by side. In the case of the embodiment, the gas outflow holes 56 and 57 are arranged at the tip 51b side of the inner tube 51 and at a position behind the front and rear centers. The gas outflow hole 56 located on the front end 51b side (front side) is disposed at a position above the rear end of the protection main body 33, and in the case of the embodiment, the front end 51b of the inner tube 51 is opened. In addition, the opening surface is configured to incline forward with respect to the horizontal direction. The gas outflow hole 57 located on the rear side is disposed at a position above the protective main body 35, at a position behind the partition section 45 and at a position ahead of the discharge port cover section 52. The inner tube base fabric 61, which will be described later, is cut out into a substantially circular shape so that the opening surface is substantially along the horizontal direction. In the case of the embodiment, the gas outflow hole 56 on the front end 51b side (front side) is configured to have an opening area larger than the opening area of the gas outflow hole 57 on the rear side.

  In addition, as shown in FIGS. 7 and 8, the inner tube 51 of the embodiment is formed by folding an inner tube base fabric 61 made of a woven fabric having flexibility into two pieces, and the corresponding peripheral edges are connected to the suture thread T. It is formed in a substantially cylindrical shape by stitching it using. In the case of the embodiment, the inner tube base fabric 61 has an outer shape in which the lower edge side is connected, and the inner tube 51 has completed expansion of the stitched portions 59 at the peripheral edges of the inner tube base fabric 61. It is configured to be arranged on the upper edge 51d side of the hour.

  The stitched portion 59 has a width dimension W3 (inner diameter dimension) of the discharge port cover portion 52 that is greater than the width dimensions W4, W5 (inner diameter dimension) of the other general portions 53 (the coupling side portion 54 and the gas guide portion 55). Only the area of the discharge port cover portion 52 is formed to protrude upward so as to increase. That is, in the stitched portion 59, the protruding portion 59a constituting the region of the discharge port cover portion 52 disposed on the outer peripheral side of the gas discharge port 16a of the inflator 14 is in the direction perpendicular to the axis of the inflator 14 (in the vertical direction in the embodiment). The distance from the inflator 14 is increased. In the case of the embodiment, the amount of protrusion H1 (see FIG. 7) of the protruding portion 59a upward from the general portion 59b is set to about ½ of the width dimension W4 of the connecting side portion 54 at the stitched portion 59. Yes. In the case of the embodiment, in the stitched portion 59, the vicinity of the boundary portion between the protruding portion 59a and the general portion 59b excluding the protruding portion 59a (both front and rear sides of the protruding portion 59a) is expanded from the gas discharge port 16a. The protruding portion 59a and the general portion 59b are formed so as to be smoothly connected so that stress concentration does not easily occur when the working gas G is discharged. In particular, the region 59c on the front side of the protruding portion 59a on the downstream side of the expansion gas G is inclined so as to gently fall toward the general portion 59b, and is more horizontal than the region 59d on the rear side of the protruding portion 59a. The inclination angle with respect to the direction is made small.

  As shown in FIGS. 7 and 9, the inner tube base fabric 61 constituting the inner tube 51 of the embodiment is divided into three parts on the front-rear direction side, and a base fabric 62 constituting the discharge port cover portion 52, It is configured by sewing the corresponding front and rear edge portions of the base fabric 63, 64 constituting the general portion 53 (the connecting side portion 54 and the gas guide portion 55) other than the discharge port cover portion 52. ing. The base fabric 62 constituting the discharge port cover portion 52 improves the heat resistance by applying a coating agent made of silicon or the like to the surface of a woven fabric formed by weaving polyamide yarn or polyester yarn by plain weaving or the like. Coated fabric. The base fabrics 63 and 64 constituting the connection side portion 54 and the gas guide portion 55 are formed from a non-coated fabric formed by weaving polyamide yarn, polyester yarn or the like by plain weaving or the like. In the case of the embodiment, as shown in FIG. 9, the base fabric 62 constituting the discharge port cover portion 52 has the front edge 62a side positioned outside the base fabric 64 constituting the gas guide portion 55, and the rear edge 62b. The side is positioned on the inner side of the base fabric 63 constituting the connecting side portion 54, and is sewn to the base fabrics 62 and 63, respectively. Further, in the case of the embodiment, the base fabric 62 constituting the discharge port cover portion 52 is formed from surplus material generated when the bag main body fabric is cut out at the time of manufacturing the bag main body 26, and is formed on both sides. A coating agent is applied (see FIGS. 8 and 9).

  Next, the mounting of the head protection airbag device M of the embodiment on the vehicle V will be described. First, the inner tube 51 manufactured in advance is inserted into the bag body 26 to manufacture the airbag 25. Thereafter, the airbag 25 is folded so that the lower edge 26b side approaches the upper edge 26a side, and when the folding is completed, the airbag 25 is wrapped with a wrapping material (not shown) for preventing collapse. Next, the attachment bracket 10 is attached to the attachment portion 41 formed on the upper edge 26 a side of the bag body 26 and the attachment portion 48 formed on the connecting cloth 47. The inflator 14 is inserted into the connecting portion 30 of the bag body 26 from the insertion opening 31 so that the small diameter portion 16 is inserted into the inner peripheral side of the discharge port cover portion 52 in the inner tube 51. The holding ring portion 20F of the front mounting bracket 19F is externally mounted on the connecting portion 30, the holding ring portion 20B of the rear mounting bracket 19B is externally mounted on the main body 15 of the inflator 14, and the mounting brackets 19F and 19B are mounted on the inflator 14. Attachment and the connecting part 30 of the airbag 25 and the inflator 14 are connected to form an airbag assembly.

  Thereafter, each of the mounting brackets 10, 19F, 19B is disposed at a predetermined position on the inner panel 2 on the body 1 side, and is attached and fixed using the mounting bolts 11 and 22, and the airbag assembly is attached to 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 the gas discharge port 16a of the inflator 14 flows through the inner tube 51 and passes through the gas supply path. The air bag 25 is configured by the lower edges of the front pillar garnish 4 and the roof head lining 5 by inflating the portion 28 and flowing into the protective main body portions 33 and 35 of the bag main body 26 from the gas outflow holes 56 and 57. As shown by the two-dot chain line in FIG. 1, the airbag cover 8 is pushed open and protruded downward, so as to cover the windows SW1, SW2, the center pillar portion CP, and the rear pillar portion RP so as to cover the inside of the vehicle. Will expand.

  In the head protection airbag device M of the embodiment, the inner tube 51 is formed in a substantially cylindrical shape by folding the inner tube base fabric 61 in two and sewing the corresponding peripheral edges. , The inner diameter dimension (width dimension W3 in a state of flat deployment) of the discharge port cover portion 52 covering the outer peripheral side of the gas discharge port 16a (small diameter portion 16) of the inflator 14 is the connecting side portion 54 that becomes the insertion opening 31 side. Is set larger than the inner diameter dimension (width dimension W4 in a state of flat development). In the head protecting airbag device M according to the embodiment, the portion (protrusion) disposed in the outer peripheral side region of the gas discharge port 16a (small diameter portion 16) in the stitched portion 59 between the peripheral edges of the inner tube base fabric 61. The part 59a) is set to have a large separation distance from the inflator 14 in the direction orthogonal to the axis (vertical direction) of the inflator 14 (see FIG. 11). That is, in the head protection airbag device M of the embodiment, as shown in FIG. 10, the sutured part 59 formed in the inner tube 51 is separated from the inflator 14 in a part near the gas discharge port 16 a in the inflator 14. Therefore, even if the expansion gas G is ejected substantially radially from the gas discharge port 16a, the expansion gas G ejected from the gas discharge port 16a is in a high pressure state. It can suppress hitting with the suture thread T etc. which comprise the stitching | suture site | part 59 (projection part 59a) arrange | positioned in the area | region of the outer peripheral side of the discharge outlet 16a. Therefore, in the head protection airbag device M of the embodiment, in order to inflate a large-capacity bag body 26 in which a plurality of protection body portions 33 and 35 are arranged in parallel in the front-rear direction, a large amount of inflation gas is used. Even when the dischargeable inflator 14 is used, it is possible to prevent the stitched portion 59 formed in the inner tube 51 from being damaged by the inflation gas G, and the durability of the inner tube 51 can be improved. Further, in the head protecting airbag device M of the embodiment, only by changing the shape of the stitched portions 59 between the peripheral edges of the inner tube base fabric 61 (in other words, the outer shape of the inner tube base fabric 61), The durability of the inner tube 51 can be improved, and the configuration is simplified and the manufacturing man-hours and costs are reduced as compared with the conventional head protection airbag device in which a separate protective cloth is provided. Can do.

  Therefore, in the head protection airbag device M of the embodiment, the durability of the inner tube 51 disposed in the bag body 26 can be improved as a simple configuration.

  Further, in the head protection airbag device M of the embodiment, the inner diameter dimension (width dimension W5 in a flatly deployed state) of the gas guide part 55 located on the distal end side of the discharge port cover part 52 in the inner tube 51 is discharged. Since the inner diameter dimension of the outlet cover portion 52 (the width dimension W3 in the flat deployed state) is set smaller, the inner tube 51 is positioned on the front end side of the outlet cover portion 52 when the airbag is deployed and inflated. The gas guide section 55 is narrowed in flow passage cross-sectional area from the discharge port cover section 52, and can be ensured high without reducing the flow rate of the expansion gas flowing inside the gas guide section 55. Therefore, in the head protection airbag device M of the embodiment, the front protection main body 33 disposed at a position away from the inflator 14 can also be rapidly inflated.

  Furthermore, in the head protection airbag apparatus M of the embodiment, the inner tube 51 is configured so that the discharge port cover portion 52 and the remaining general portion 53 (the connection side portion 54 and the gas guide portion 55) are separated from each other. The base fabric 62 that is configured by the base fabrics 62, 63, and 64 and that constitutes the discharge port cover portion 52 is more heat resistant than the base fabrics 63 and 64 that constitute the general portion 53 (the coupling side portion 54 and the gas guide portion 55). The structure is improved. Therefore, in the head protection airbag device M of the embodiment, even when the inflation gas G discharged from the gas discharge port 16a of the inflator 14 is at a high temperature, the discharge port cover portion 52 itself can be prevented from being damaged. The durability of the inner tube 51 can be further improved. Further, in the head protection airbag device M of the embodiment, only the base fabric 62 that constitutes the discharge port cover portion 52 is made of a coated fabric with improved heat resistance, and the remaining general portions (the connecting side portions 54, Since the base fabrics 63 and 64 constituting the gas guiding portion 55) are made of non-coated cloth, the manufacturing cost of the inner tube can be reduced as compared with the case where the entire inner tube is made of coated cloth. it can. Of course, if such a point is not taken into consideration, the discharge port cover portion is configured as a base tube (coated fabric or non-coated fabric) of the same material as the base fabric constituting the remaining general portion as an inner tube. Things may be used.

  Furthermore, in the head protection airbag device M of the embodiment, since the inner tube 51 is configured to dispose the stitched portion 59 on the upper edge 51d side, the inner tube 51 is inflated in each of the protection main body portions 33 and 35. The gas outflow holes 56 and 57 for allowing the gas to flow out may be formed by cutting out the inner tube base fabric 61, and the sewn part is arranged on the lower edge side, and the gas outflow hole is formed by dividing the sewn part. Compared to the case, the accuracy of the inner diameter dimension of each gas outflow hole can be stabilized. Of course, if such a point is not taken into consideration, an inner tube formed by disposing the suture site on the lower edge side and dividing the gas outflow hole by the suture site may be used.

  Furthermore, in the head protection airbag device M of the embodiment, an enlarged portion 29 that can accommodate the protruding portion 52a of the discharge port cover portion 52 of the inner tube 51 is formed on the upper edge 26a side of the bag body 26. Therefore, when the inflator 14 is operated, the discharge port cover portion 52 can be inflated without being restricted by a portion on the upper edge 26a side of the bag body 26 disposed on the outer peripheral side. Therefore, in the head protection airbag device M according to the embodiment, the separation distance between the protrusion 59a of the stitched portion 59 arranged in the region of the discharge port cover portion 52 and the inflator 14 can be secured as much as possible, and the inner tube It can prevent as much as possible that the stitching | suture site | part 59 (projection part 59a) formed in 51 receives damage with the gas for expansion | swelling. In the embodiment, the bag body 26 inclines the connection part 30 with respect to the gas supply path part 28 with a slight rearward fall in the vicinity of the boundary part between the connection part 30 and the gas supply path part 28 in the vicinity of the rear end. Thus, although bent and mounted on the vehicle V (see FIG. 1), in the head protection airbag device M of the embodiment, the protruding portion 52a of the discharge port cover portion 52 and the enlarged portion 29 of the bag body 26 are provided. The expansion gas G discharged from the inflator 14 is sewn on the stitching portion 59 even if the connecting portion 30 is mounted on the vehicle so as to be bent with respect to the gas supply passage portion 28. It is possible to accurately prevent the protruding portion 59a from being damaged.

  In addition, in the bag main body 26 of the embodiment, the connecting portion 30 is configured so as to be positioned one step below the gas supply path portion 28, and a portion on the upper edge side in the vicinity of the connecting portion 30 in the gas supply path portion 28. Constitutes the enlarged portion 29. In other words, in the bag main body 26 according to the embodiment, the upper edge 26a of the bag main body 26 is not partially recessed on the upper edge side of the bag main body 26, but the upper edge 30a of the connecting portion 30 over the entire front and rear. Is also configured to be recessed upward. Of course, the shape of the bag body is not limited to the embodiment, and the upper and lower positions of the gas supply path portion and the connection portion are substantially matched, and the bag supply body portion is connected to the connection portion side portion of the gas supply path portion. It is good also as a shape which dented the upper edge side partially upwards, and has arrange | positioned the enlarged part.

  Moreover, you may use the thing provided with the bag main body 26A and the inner tube 51 as shown to FIG. The bag body 26A has the same configuration as the above-described bag body 26 except that the connecting portion 30A is arranged with the gas supply path portion 28A substantially aligned in the vertical position and does not include an enlarged portion. The same members are denoted by “A” at the end of the same reference numerals, and detailed description thereof is omitted. The inner tube 51 is the same as the inner tube 51 described above, and the connecting portion 30A in the bag body 26A is configured such that the portion (projecting portion 52a) on the stitching portion 59 side of the discharge port cover portion 52 is folded downward. To the gas supply path 28A. In other words, as shown in FIGS. 12 and 13, the discharge port cover portion 52 of the inner tube 51 has a substantially cylindrical main body portion 67 and a folded portion 68 that is folded back at the crease CL with respect to the main body portion 67. The projecting portion 52a constitutes a folded portion 68. When the airbag 25A having such a configuration is used, in the inner tube 51, in the region of the discharge port cover portion 52, the stitched portion 59 (projecting portion 59a) is disposed in the region of the folded portion 68, and the discharge port In the cover portion 52, the folded portion 68 is hidden by the fold CL that is folded with respect to the main body portion 67 and is not exposed, so that the cover portion 52 is discharged from the gas discharge port 16a of the inflator 14, as shown in FIGS. It is possible to reliably prevent the inflation gas G from hitting the sutured portion 59 (projecting portion 59a) and the sutured portion 59 (projecting portion 59a) from being damaged by the inflation gas.

  Furthermore, since the airbags 25 and 25A of the embodiment are manufactured by bag weaving of the bag bodies 26 and 26A, a coating agent made of silicon or the like for preventing gas leakage is applied to the outer surface side to make it airtight. The sex is secured. In other words, since the bag body 26, 26A of the embodiment is manufactured by bag weaving, the coating agent cannot be applied to the inner peripheral surface side, and the portion of the portion located near the gas discharge port of the inflator It is difficult to partially improve the strength (heat resistance) on the inner peripheral surface side. However, in the embodiment, since the inner tube 51 with improved durability is used, the stitched portion 59 of the inner tube 51 can be prevented from being damaged by the inflation gas, and the bag bodies 26 and 26A are damaged. Can be accurately prevented, and even the bag body 26, 26A of bag weave can be used suitably. Of course, the head protection airbag device to which the present invention is applicable is not limited to a bag-woven bag body, but from a suture bag in which a base fabric is cut into a predetermined shape and sewn using a suture thread. The resulting bag body may be used.

  In the embodiment, the bag body 26 having a configuration in which the connecting portion 30 is disposed on the rear end 28a side of the gas supply passage portion 28 and two protective body portions 33 and 35 are arranged in parallel in the front-rear direction is taken as an example. However, the outer shape of the bag body is not limited to this. For example, the present invention can be applied to a bag body having a configuration in which the connecting portion is arranged on the front end side of the gas supply path portion or a configuration in which three protective main body portions are arranged in parallel in the front-rear direction.

1 ... Body
14 ... Inflator,
16a ... Gas outlet,
19 (19F, 19B): Mounting bracket,
20 (20F, 20B) ... retaining ring part (clamp),
25 ... Airbag,
26 ... Bag body,
26a ... upper edge,
28 ... gas supply passage,
29 ... Enlarged part,
30 ... connecting part,
31 ... opening for insertion,
33, 35 ... protection body,
51 ... Inner tube,
52 ... discharge port cover,
53. General part,
54 ... the connecting side,
55 ... Gas guide,
56, 57 ... Gas outflow holes,
59 ... suture site,
61 ... Inner tube base fabric,
62, 63, 64 ... base fabric,
G ... expansion gas,
SW1, SW2 ... windows,
V ... Vehicle,
M: Head protection airbag device.

Claims (7)

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 disposed in the bag main body,
The bag body 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,
A substantially cylindrical connecting part formed so as to protrude from one end side in the front-rear direction of the gas supply path part and connected to the gas supply path part, and having an insertion opening for inserting the inflator;
With
The inner tube has a substantially cylindrical shape covering an inner peripheral side from the connecting portion to the gas supply path portion in the bag body,
The inflator is
The outer shape is substantially cylindrical, and a plurality of gas discharge ports are provided along the circumferential direction from the insertion opening to the distal end side inserted into the bag body through the inner tube. With
In a state where the gas discharge port side is inserted into the bag body, a clamp disposed on the outer peripheral side of the connecting portion is tightened to be connected to the connecting portion via the inner tube. ,
The inner tube is formed into a substantially cylindrical shape by folding the inner tube base fabric made of a woven fabric having flexibility and sewing the corresponding peripheral edges, and on the lower edge side, In the head protection airbag device having a configuration in which a plurality of gas outflow holes through which the inflating gas can flow out to the respective protection main body portions are arranged in parallel in the front-rear direction.
The inner tube is
In the stitching site where the peripheral edges of the inner tube base fabric are sewn together, the separation distance from the inflator in the direction perpendicular to the axis of the inflator is increased at the site disposed in the outer peripheral side region of the gas discharge port. In addition,
A head protection airbag device characterized in that an inner diameter dimension of a discharge port cover portion covering an outer peripheral side of the gas discharge port is set larger than an inner diameter dimension of a portion on the insertion opening side.   2. The head according to claim 1, wherein in the inner tube, a portion located on a distal end side of the discharge port cover part has an inner diameter dimension set smaller than an inner diameter dimension of the discharge port cover part. Protective airbag device. The inner tube is composed of the discharge port cover part and the remaining general part from another base fabric,
The head protection airbag according to claim 1 or 2, wherein the base fabric constituting the discharge port cover portion is configured with improved heat resistance than the base fabric constituting the general portion. apparatus.   The head protection airbag device according to any one of claims 1 to 3, wherein the inner tube is configured to dispose the suture site on an upper edge side.   An enlarged portion capable of accommodating the discharge port cover portion of the inner tube is configured to dent the upper edge of the bag body upward in a region extending from the upper edge side of the connecting portion of the bag body in the front-rear direction. The head protection airbag device according to claim 4, wherein the head protection airbag device is formed.   5. The head protection airbag according to claim 4, wherein the inner tube is housed in the bag body so that a portion on the suture portion side in the discharge port cover portion is folded downward. apparatus.   The head protection airbag device according to any one of claims 1 to 6, wherein the bag body is manufactured by bag weaving.

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