Head protection airbag device

Abstract

To provide a head protection airbag device which can stably deploy and inflate an airbag during deployment and inflation on a vehicle inner side.SOLUTION: A head protection airbag device includes: an airbag which is folded and stored along a longitudinal direction on an upper edge side of a window on a vehicle inner side of a vehicle and deploys and inflates downward so as to cover the vehicle inner side of the window during inflow of inflation gas from an inflator. The airbag 20 has a window shielding inflation section 27 for covering the vehicle inner side of the window. A folding shape 61 of the window shielding inflation section 27 is configured to have an inner roll folding section 62 roll-folding toward the vehicle inner side I so that a lower edge 20b side of the airbag is made closer to an upper edge 20a side and an outer roll folding section 64 roll-folding toward a vehicle outer side O so that the inner roll folding section is made closer to the upper edge side of the airbag while arranging the inner roll folding section on a center 64a side.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a head protection airbag device including an airbag that is folded and stored on the upper edge side of a window on the interior side of a vehicle and that deploys and inflates downward when inflation gas flows in to cover the interior side of the window. [Background technology]

[0002] Conventionally, in this type of head protection airbag device, the lower edge of the airbag when deployed flat is folded by an outer roll fold, which rolls the lower edge of the airbag toward the vehicle outer wall of the airbag so that it approaches the upper edge (see, for example, Patent Document 1). In this head protection airbag device, when the airbag deploys downward from the upper edge of the window during activation, the outer roll fold is released so that the airbag approaches the window and deploys and inflates, so that the airbag can smoothly enter between the occupant and the window even if the occupant is close to the window. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-71542 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional head protection airbag devices, if the bottom frame of the window is pushed hard toward the inside of the vehicle due to a side collision and the airbag deploys and inflates downward from the upper edge of the window, there is a risk that the airbag will ride up onto the bottom frame of the window and be unable to cover the inside side of the frame, making it difficult to ensure smooth deployment toward the inside of the vehicle.

[0005] The present invention is devised to solve the above-mentioned problems, and has an object to provide a head-protecting airbag device that can stably deploy and inflate an airbag inside the vehicle when deployed and inflated. [Means for solving the problem]

[0006] A head-protecting airbag device according to the present invention is a head-protecting airbag device including an airbag that is folded and stored along a front-rear direction on an upper edge side of a window on the interior side of a vehicle, and that deploys and inflates downward so as to cover the interior side of the window when inflation gas flows in from an inflator, The airbag includes a window-shielding inflatable portion that covers the interior side of the window when the airbag is fully inflated. The folded shape of the window shielding inflatable portion of the airbag is an inner roll folding portion that rolls and folds the lower edge side of the flatly deployed airbag toward the inside of the vehicle so as to bring the lower edge side of the flatly deployed airbag closer to the upper edge side; an outer roll fold that rolls and folds the inner roll fold toward the outside of the vehicle so as to be close to an upper edge side of the airbag while arranging the inner roll fold toward the center side; The present invention is characterized in that it is configured to include the following.

[0007] In the head protection airbag device according to the present invention, when the airbag folded and stored on the upper edge side of the window is deployed, the window shielding expansion part has the outer roll folded part disposed on the outer periphery side of the inner roll folded part on the center side of the roll folding, and when the outer roll folded part is unfolded, the airbag is deployed along the window, and after the outer roll folded part is unfolded, the inner roll folded part is unfolded, and the window shielding expansion part deploys the entire area up to the lower edge, and the expansion is completed. At this time, at the beginning of the deployment and expansion, the outer roll folded part is unfolded, so that the airbag is deployed toward the outside of the vehicle and deployed along the window, and then, when the inner roll folded part is unfolded, the airbag is deployed toward the inside of the vehicle. That is, even if the airbag is deployed toward the outside of the vehicle at the beginning of the deployment and expansion, the lower edge side of the airbag eventually faces the inside of the vehicle as the inner roll folded part is unfolded, so that the entire airbag can be deployed and completed inside the vehicle.

[0008] Therefore, in the head protection airbag device according to the present invention, the airbag can be stably deployed and inflated inside the vehicle when deployed and inflated.

[0009] In the head-protecting airbag device according to the present invention, the window-shielding inflatable portion of the airbag at the time of completion of inflation is A shielding main body portion disposed on an interior side of the window; a lower frame side expanding portion extending downward from the shielding main body portion and capable of covering the vehicle interior side of the lower frame portion of the window; Equipped with It is desirable that the inner roll-folded portion of the airbag is configured to have the lower frame side inflation portion disposed therein, so that the fold is released on the vehicle interior side of the upper portion of the lower frame portion when the airbag is deployed and inflated.

[0010] In this configuration, when the airbag is deployed and inflated, the outer rolled folds are unfolded, and the window shielding expansion part's shielding main body side deploys while facing the outside of the vehicle, and the inner rolled folds try to unfold. At that time, even if the bottom frame part of the window is pressed toward the inside of the vehicle and the lower edge of the airbag tries to ride up onto the bottom frame part, the lower edge of the airbag is the inner rolled folds, and when it is unfolded, it unfolds toward the inside of the vehicle so as to be guided while coming into contact with the bottom frame part itself. As a result, the airbag can be stably deployed and inflated inside the vehicle when it is deployed.

[0011] In this case, it is desirable that the airbag be configured with a temporary holding means for positioning the inner roll folded portion on the vehicle interior side of the upper end of the lower frame portion when the outer roll folded portion is unfolded without hindering the unfolding of the inner roll folded portion when the airbag is deployed and inflated.

[0012] In this configuration, the inner roll folded portion before it is unfolded can be stably positioned on the inside of the vehicle at the upper end of the window sill portion by the temporary holding means, and therefore, when the inner roll folded portion is subsequently unfolded, the sill side expansion portion can be stably deployed and inflated on the inside of the vehicle at the window sill portion.

[0013] The temporary holding means can be composed of a connecting material having a lower connecting portion connected to the inner roll fold portion so that the connection can be released when the inner roll fold portion is unfolded, and so that the inner roll fold portion can be pulled toward the vehicle interior wall portion of the shielding main body portion when the outer roll fold portion is unfolded, and an upper connecting portion connected to the vehicle interior portion of the shielding main body portion above the lower connecting portion.

[0014] That is, in this configuration, when the inner roll folding portion is about to be unfolded, the connecting material can pull the inner roll folding portion connected to the lower connecting portion toward the inside of the vehicle so as to rotate around the upper connecting portion while connecting the upper connecting portion to the inside portion of the shielding main body. Therefore, just before the inner roll folding portion is unfolded, the inner roll folding portion is stably arranged on the inside of the vehicle at the upper side of the lower frame portion of the window. Then, when the unfolding of the inner roll folding portion starts, if the connecting material releases the connection state between the inner roll folding portion and the inside portion of the shielding main body, the inner roll folding portion is unfolded, and the lower frame side expansion portion that constituted the inner roll folding portion is smoothly deployed toward the inside of the lower frame portion of the window to complete the expansion. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic front view of a head-protecting airbag device according to an embodiment of the present invention, as viewed from the inside of a vehicle. [Diagram 2] FIG. 2 is a front view showing the airbag used in the embodiment in a flat deployed state. [Diagram 3] 5A to 5C are schematic cross-sectional views illustrating a folding process of the airbag according to the embodiment. [Figure 4] 5A to 5C are schematic front views illustrating a folding process of the airbag according to the embodiment. [Diagram 5] 1 is a schematic vertical cross-sectional view of an airbag when a head protection airbag device according to an embodiment is activated; [Figure 6] 6 is a schematic vertical cross-sectional view of the airbag when the head protection airbag device of the embodiment is activated, showing the state after FIG. 5. [Figure 7]11A and 11B are diagrams illustrating a modified example of the temporary holding means of the head protection airbag device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a head protection airbag device M of the embodiment is mounted on a vehicle V having two windows (side windows) W (W1, W2), and is mounted on the upper edge Wu side of the window W (1, 2) on the inside of the vehicle.

[0017] The head protection airbag device M includes an airbag 20, an inflator 12, a mounting device 10, a mounting bracket 15, and an airbag cover 9. The airbag 20 is folded and stored on the upper edge Wu side of the window W (1, 2) on the interior side of the vehicle V, from the lower edge side of the front pillar part FP, through the lower edge side of the roof side rail part RR, to the area above the rear pillar part RP along the front-rear direction.

[0018] The airbag cover 9 is composed of the lower edges of a front pillar garnish 4 arranged on a front pillar portion FP and a roof head lining 5 arranged on a roof side rail portion RR. The front pillar garnish 4 and the roof head lining 5 are made of synthetic resin and are attached and fixed to the inner side of the inner panel 2 on the body 1 (vehicle body) side of the vehicle V at the front pillar portion FP and the roof side rail portion RR, respectively. The airbag cover 9 covers the inner side I of the airbag 20 that is folded and stored (see FIG. 5), and is configured to be openable toward the inner side I when pressed by the airbag 20 so as to enable the airbag 20 to protrude downward toward the inner side of the vehicle when deployed and inflated.

[0019] The inflator 12 supplies inflation gas G (see Figs. 2 and 5) to the airbag 20, and is a generally cylindrical cylinder type with a gas discharge port (not shown) at the tip end thereof for discharging inflation gas. The inflator 12 is connected to the airbag 20 by inserting the tip end thereof, including the vicinity of the gas discharge port, into a connection port 25 (described later) of the airbag 20 and using a clamp 13 arranged on the outer periphery of the connection port 25. The inflator 12 is attached to the inner panel 2 on the body 1 side by fastening a mounting bracket 15 for holding the inflator 12 to the inner panel 2 by bolts 16, at a position above the window W2 of the inner panel 2. The inflator 12 is electrically connected to a control device (not shown) of the vehicle V via a lead wire (not shown), and is configured to be activated by receiving an activation signal from the control device when the control device detects a side collision, oblique collision, rollover, or the like of the vehicle V.

[0020] As shown in Figures 5 and 6, each mounting device 10 is used to attach a mounting piece 53 and a tension belt 54 (described later) of the airbag 20 to the inner panel 2, and in this embodiment, is a clip type made of synthetic resin that is inserted into a mounting hole 2a of the inner panel 2 and engaged with the periphery of the mounting hole 2a.

[0021] The tension belt 54 is attached to the front edge 21c of the airbag 20, and its front end side is attached to the inner panel 2 of the front pillar portion FP (see FIGS. 1 and 2).

[0022] As shown in FIG. 2, the airbag 20 includes a bag body 21, an attachment piece 53, and a tension belt .

[0023] The bag body 21 is configured to allow the inflation gas G from the inflator 12 to flow into it, unfold from a folded state, and cover the vehicle interior side I of the window W (W1, W2) and the pillar garnishes 6, 7 of the center pillar portion CP and the rear pillar portion RP, and has an outer shape that is a substantially rectangular plate with its longitudinal direction aligned approximately along the front-rear direction (see the two-dot chain line in FIG. 1) so that it can cover the vehicle interior side I from the window W1 through the center pillar portion CP and window W2 to the front side of the rear pillar portion RP when inflation is complete. In the case of this embodiment, the bag body 21 is manufactured by woven using polyamide yarn, polyester yarn, or the like.

[0024] As shown in Figures 2 and 6, the bag body 21 has a gas inflow section 23 that inflates by allowing inflation gas G to flow into it so as to separate the interior wall section 23a located on the interior side I of the vehicle and the exterior wall section 23b located on the exterior side O of the vehicle when inflation is complete, and a non-inflow section 40 that does not allow the inflation gas to flow in and is formed to connect the interior wall section 23a and the exterior wall section 23b.

[0025] The gas inlet section 23 is provided on the upper edge side and is configured to include a cylindrical connection port 25 connected to the inflator 12, and a window shielding inflatable section 27 that inflates when inflation gas G flows in from the connection port 25 and covers the interior side of the window W (W1, W2). In the case of this embodiment, the connection port 25 is provided near the middle in the front-to-rear direction of the bag body 21 and extends obliquely rearward from the upper edge 21a side.

[0026] The window shielding inflatable portion 27 inflates so that the front portion 27a covers the interior side I of the window W1 to protect the front seat occupants, and the rear portion 27b inflates so as to cover the interior side I of the window W2 to protect the rear seat occupants.

[0027] Furthermore, the window shielding inflatable portion 27 includes a shielding main body portion 30 disposed on the vehicle interior side I of the windows W1, W2, and a lower frame side inflatable portion 35 extending downward from the shielding main body portion 30 and capable of covering the vehicle interior side I (interior side surface Di) of the upper portion Da of the door trim DT serving as the lower frame portion of the windows W1, W2. The window shielding inflatable portion 27 includes a gas conducting portion 28 disposed in an upper region of the shielding main body portion 30, which allows the inflation gas G flowing in from the connection port portion 25 to flow between the front and rear of the shielding main body portion 30.

[0028] The shielding body 30 includes a front shielding body 31 capable of covering the vehicle interior side I of the window W1, and a rear shielding body 33 capable of covering the vehicle interior side of the window W2. The front shielding body 31 connects a front side 36 of the lower frame side inflatable portion 35 downward, and the rear shielding body 33 connects a rear side 37 of the lower frame side inflatable portion 35 downward.

[0029] In the embodiment, when inflation is complete, the window shielding inflation portion 27 of the airbag 20 is positioned such that the lower edge 30b side of the shielding main body portion 30 and the lower frame side inflation portion 35 are positioned on the upper edge of the door trim DT on the lower edge Wd side of the windows W1, W2, i.e., below the belt line BL.

[0030] The non-inflow portion 40 is configured to include a peripheral portion 41 that constitutes the outer periphery of the gas inflow portion 23 , and closing portions 45 , 46 , 47 , 48 , 49 , 50 that are disposed within the region of the window shielding inflatable portion 27 .

[0031] The closing portion 45 is disposed in the front shielding body 31 so as to extend downward from the upper edge 41a of the peripheral portion 41, and the closing portion 46 is disposed below the closing portion 45 so as to extend upward from the lower edge 41b of the peripheral portion 41. The closing portions 47, 49 are disposed in a row in the front and rear behind the closing portion 46, and are disposed so as to extend upward from the lower edge 41b. The closing portion 48 is disposed above between the closing portions 46, 47 and away from the peripheral portion 41. The closing portion 50 is disposed in a substantially circular shape behind the closing portion 49 and away from the lower edge 41b. The closing portion 51 is disposed so as to extend forward from the rear edge 41d of the peripheral portion 41 to near the lower side of the connection port portion 25.

[0032] In the embodiment, the closing portion 46 is provided with an inverted U-shaped slit 42 and a tongue 43 forming a connecting member 57. The connecting member 57 consisting of the tongue 43 has a tip 43a of the tongue 43 connected as an upper connecting portion 57a ​​to a lower end 45a of the closing portion 45 on the vehicle interior portion 31a side, which is the vehicle interior side I of the front shielding main body portion 31 (see FIG. 3C and FIG. 4B). The connection is performed by sewing using a breakable sewing thread 58. The lower connecting portion 57b of the connecting member 57 is made of the base portion 43b of the tongue 43 itself, and is arranged so as to be integrally formed with the lower edge 41b side of the peripheral portion 41.

[0033] The connecting member 57 made of the tongue piece 43 constitutes a temporary holding means 56 for the inner roll folded portion 62 described later when the airbag 20 is deployed and inflated, and this temporary holding means 56 positions the inner roll folded portion 62 on the vehicle interior side I of the upper end surface Dt of the door trim DT as the lower frame part when the outer roll folded portion 64 described later is unfolded without hindering the unfolding of the inner roll folded portion 62. In the embodiment, the temporary holding means 56 is made of a connecting member 57, and this connecting member 57 is arranged so that the connection between the inner roll folded portion 62 and the vehicle interior part 31a side can be released when the inner roll folded portion 62 is unfolded. In the case of the embodiment, the connection between the inner roll folded portion 62 and the vehicle interior part 31a side is released by breaking the stitching thread 58. Furthermore, the length dimension L of the connecting material 57 is set so that when the outer roll folded portion 64 is unfolded, the inner roll folded portion 62 can be pulled toward the inside side I of the upper end surface Dt of the door trim DT (see A and B in Figures 6).

[0034] The mounting pieces 53 are joined by sewing to the upper edge 20a (upper edge 21a of the bag body 21) of the airbag 20 and are arranged at six locations along the front-rear direction. Each mounting piece 53 has a mounting hole 53a at its tip side through which the mounting tool 10 passes.

[0035] The tension belt 54 is attached to the front edge 21c of the bag body 21, and has an attachment hole 54a at its tip (front end) through which the attachment tool 10 passes.

[0036] The airbag 20 is stored on the upper edge Wu side of the window W as a fully folded body 60 in which the lower edge 21b of the bag body 21, which is in a flat deployed state with the vehicle interior wall portion 23a and the vehicle exterior wall portion 23b overlapping each other, is folded so as to approach the upper edge 21a.

[0037] In the folding process of the folded body 60, first, as shown in A and B of Fig. 3 and A and B of Fig. 4, a bellows-folded portion 66 is formed in the gas conducting portion 28 on the upper edge 20a side (the upper edge 21a side of the bag body 21) of the flattened airbag 20. Next, as shown in B and C of Fig. 3 and B of Fig. 4, an inner rolled fold portion 62 is formed by rolling the lower edge 20b (21b) side toward the vehicle interior side I so as to approach the upper edge 20a side. The inner roll fold 62 is composed of the lower frame side expansion portion 35 (more specifically, the lower frame side expansion portion 35 and the lower edge 30b of the shielding main body portion 30), and at the front side portion 36, a connecting material 57 consisting of a tongue piece 43 is pulled out and the tip 43a is connected to the lower end 45a of the closing portion 45 on the vehicle interior side portion 31a of the front shielding main body portion 31 by sewing using a sewing thread 58.

[0038] 3C and 3D and 4B and 4C, the inner rolled fold 62 is positioned on the center 64a side, and an outer rolled fold 64 is formed which is roll-folded toward the vehicle exterior side O so as to approach the upper edge 20a side of the airbag 20, thereby forming a completely folded body 60 having a folded shape 61 in which the inner rolled fold 62 is disposed on the center 64a side of the outer rolled fold 64. Once the completely folded body 60 is formed, the completely folded body 60 is wrapped in a breakable wrapping material 68 to prevent it from collapsing.

[0039] Then, the mounting fixtures 10 are attached to the mounting pieces 53 and tension belts 54, the inflator 12 with the mounting bracket 15 attached is inserted into the connection port 25, and connected to the connection port 25 using the clamp 13 to form the airbag assembly 70, and then each mounting fixture 10 is inserted into the mounting hole 2a at the corresponding part of the inner panel 2 to be attached, and the mounting bracket 15 that holds the inflator 12 is fixed to a predetermined part of the inner panel 2 with a bolt 16, and further, a lead wire (not shown) extending from a control device for operating the inflator is connected to the inflator 12. Then, the front pillar garnish 4 and the roof head lining 5 are attached to the inner panel 2 on the body 1 side, and further, the pillar garnishes 6, 7 are attached to the inner panel 2 on the body 1 side, and the head protection airbag device M can be mounted in the vehicle V.

[0040] After the head protection airbag device M of the embodiment is installed in the vehicle V, when the inflator 12 is activated in response to an activation signal from the control device in the event of a side collision, oblique collision, or rollover of the vehicle V, the inflation gas G (see Figure 2) discharged from the inflator 12 flows into the bag body 21, and the inflating bag body 21 breaks the wrapping material 68 and pushes open the airbag cover 9 formed by the lower edges of the front pillar garnish 4 and the roof head lining 5, protruding downward and greatly inflating to cover the windows W1, W2, the center pillar portion CP, and the interior side I of the rear pillar portion RP, as shown by the dotted line in Figure 1 and Figures 5 and 6.

[0041] In this case, in the head protection airbag device M of the embodiment, the window shielding inflatable portion 27 has a folded shape 61 in which the outer roll folded portion 64 is disposed on the outer peripheral side of the inner roll folded portion 62 on the side of the center 64a of the roll folding, and when the outer roll folded portion 64 is unfolded, it deploys and inflates along the window W1 as shown in A and B of Figures 5 and A and B of Figures 6, and after the outer roll folded portion 64 is unfolded, the inner roll folded portion 62 is unfolded, and the window shielding inflatable portion 27 deploys the entire area up to the lower edge 20b, and completes the expansion. At this time, at the beginning of the deployment and inflation, as shown in A and B of Figures 5 and A of Figure 6, the outer roll folded portion 64 is unfolded, so that it deploys toward the outside O of the vehicle and deploys and inflates along the window W1, and then, when the inner roll folded portion 62 is unfolded, it deploys toward the inside I of the vehicle. That is, even if the airbag 20 initially deploys toward the vehicle exterior side O, the lower edge 20b of the airbag 20 eventually faces the vehicle interior side I as the inner rolled fold 62 is unfolded, so that the entire airbag 20 can complete deployment and inflation on the vehicle interior side I. Although not shown, the airbag 20 can also complete deployment and inflation on the vehicle interior side I with a similar behavior at the window W2 portion.

[0042] Therefore, in the head protection airbag device M of the embodiment, the airbag 20 can be stably deployed and inflated on the inner side I of the vehicle during deployment.

[0043] In the head protection airbag device M of the embodiment, the window shielding inflatable portion 27 of the airbag 20 at the time of complete inflation includes the shielding main body portion 30 arranged on the vehicle interior side I of the windows W1, W2, and the lower frame side inflatable portion 35 extending downward from the shielding main body portion 30 and capable of covering the vehicle interior side I of the door trim DT serving as the lower frame portion of the windows W1, W2. The inner roll folded portion 62 of the airbag 20 is configured to dispose the lower frame side inflatable portion 35 and to unfold the fold on the vehicle interior side surface Di on the upper portion Da side of the door trim DT when deployed and inflated.

[0044] Therefore, in the embodiment, when the airbag 20 is deployed and inflated, the outer rolled fold 64 is unfolded, and the shielding main body 30 side of the window shielding inflatable portion 27 is deployed while facing the vehicle exterior side O, and the inner rolled fold 62 tries to unfold. At that time, even if the door trim DT of the window W1 is pressed toward the vehicle interior side I as shown in FIG. 6A and the front side 36 of the lower frame side inflatable portion 35 on the lower edge 20b side of the airbag 20 tries to ride up onto the door trim DT, the lower edge 20b side of the airbag 20 is the inner rolled fold 62 as shown in FIG. 6B, and when unfolded, it unfolds toward the vehicle interior side I as guided by the door trim DT itself. As a result, the airbag 20 can stably complete deployment and inflation on the vehicle interior side I when deployed and inflated.

[0045] With regard to the rear portion 27b of the window shielding expansion portion 27 which covers the window W2, although this is not shown in the figure, even if the door trim DT of the window W2 moves toward the inside of the vehicle, the rear portion 27b of the window shielding expansion portion 27 is guided to the inside side I of the center pillar portion CP, and the rear portion 37 of the lower frame side expansion portion 35 can complete its deployment and inflation on the inside side I of the door trim DT.

[0046] Furthermore, in the embodiment, the airbag 20 is configured to include a temporary holding means 56 that positions the inner roll folded portion 62 during deployment and inflation on the vehicle interior side I (vehicle interior side surface Di) of the upper end Dat of the door trim DT as the lower frame portion when the outer roll folded portion 64 is unfolded, without hindering the unfolding.

[0047] Therefore, in the embodiment, the inner roll folded portion 62 before being unfolded can be stably positioned on the interior side Di of the upper end Dat of the door trim DT of the window W1 by the temporary holding means 56, and therefore, when the inner roll folded portion 62 is subsequently unfolded, the front portion 36 of the lower frame side expansion portion 35 can be stably deployed and inflated on the interior side I of the door trim DT of the window W1, as shown in Figures 6A and 6B.

[0048] In the embodiment, a connecting member 57 is used as the temporary holding means 56. The connecting member 57 is configured to have a lower connecting portion 57b connected to the inner roll folded portion 62 so as to be able to be disconnected when the inner roll folded portion 62 is unfolded, and to be able to pull the inner roll folded portion 62 when the outer roll folded portion 64 is unfolded toward the vehicle interior wall portion 23a of the front shielding main body portion 31 of the shielding main body portion 30 when the outer roll folded portion 64 is unfolded, and an upper connecting portion 57a ​​connected to the vehicle interior portion 31a of the front shielding main body portion 31 of the shielding main body portion 30 above the lower connecting portion 57b.

[0049] Therefore, in the embodiment, when the inner roll folded portion 62 is about to be unfolded, as shown in Fig. 6A and B, the connecting material 57 can pull the inner roll folded portion 62, to which the lower connecting portion 57b is connected, toward the inner side I of the vehicle so as to rotate about the upper connecting portion 57a ​​as a rotation center, in a state in which the upper connecting portion 57a ​​is connected to the vehicle interior portion 31a side of the shielding main body 30. Therefore, just before the inner roll folded portion 62 is unfolded, the inner roll folded portion 62 is stably arranged on the inner side surface Di of the upper portion Da of the door trim DT of the window W1. Then, when the folding begins to be removed thereafter, the stitching thread 58 breaks and the connecting material 57 releases the connection between the inner roll folding portion 62 and the vehicle interior portion 31a of the shielding main body portion 30, and as the inner roll folding portion 62 is unfolded, the front portion 36 of the lower frame side expansion portion 35 that constituted the inner roll folding portion 62 smoothly deploys toward the vehicle interior side Mi of the door trim DT of the window W1, completing the expansion.

[0050] In the embodiment, the connecting material 57 that connects the inner roll folded portion 62 and the vehicle interior portion 31a of the shielding main body 30 by sewing is exemplified as the temporary holding means 56 for holding the inner roll folded portion 62 tensilely toward the vehicle interior side I until immediately before the folding is unfolded, but a tape-shaped connecting material 57A that uses an adhesive (adhesive) 59 may also be used as shown in Fig. 7. With this connecting material 57A as well, when the inner roll folded portion 62 is about to be unfolded, the connecting material 57 can pull the inner roll folded portion 62, to which the lower connecting portion 57b is connected, toward the vehicle interior side I with the upper connecting portion 57a ​​connected to the vehicle interior portion 31a of the shielding main body 30.

[0051] In addition, in the embodiment, the connecting material 57 as temporary holding means 56 is arranged on the front side 36 side of the lower frame side expansion portion 35, which is the front 27a side of the window shielding expansion portion 27, but it may also be arranged on the rear side 37 side of the lower frame side expansion portion 35.

[0052] In addition, in the embodiment, the connecting material 57 serving as the temporary holding means 56 has the lower connecting portion 57b connected to the inner roll folded portion 62 and the upper connecting portion 57a ​​connected to the lower end 45a of the closing portion 45, which is located on the vehicle interior side portion 31a side directly above the lower connecting portion 57b. However, as shown by the dotted line in Figure 4B of connecting material 57B, the lower connecting portion 57b may be connected to the inner roll folded portion 62 and the upper connecting portion 57a ​​may be connected to the front edge 41c of the peripheral portion 41, which is located on the vehicle interior side portion 31a side of the shielding main body portion 30. In the example shown in the figure, the upper and lower connecting portions 57a, 57b are connected to the inner roll fold portion 62 and the front edge 41c on the vehicle interior side portion 31a using adhesive, and when a tensile force is applied to the connecting material 57B when the inner roll fold portion 62 is unfolded, at least one of the connecting portions 57a, 57b peels off and becomes disconnected so as not to hinder the unfolding of the inner roll fold portion 62.

[0053] Furthermore, the connecting materials 57, 57A, 57B may be provided with a slit or a breakable portion having a narrowed width dimension to reduce strength, in the area between the connecting portions 57a, 57b on both sides, so that the breakable portion can break when the inner roll folded portion 62 begins to unfold, thereby releasing the connection between the inner roll folded portion 62 and the vehicle interior portion 31a.

[0054] Furthermore, the upper and lower connecting portions of the connecting material may be provided in the peripheral portion 41 or in the closed portion as the non-inflow portion 40, or may be disposed in the gas inflow portion 23 area as long as no leakage of inflation gas occurs. [Explanation of symbols]

[0055] 12...inflator, 20...airbag, 20a...upper edge, 20b...lower edge, 27...window shielding expansion portion, 30...shielding main body portion, 31...front shielding main body portion, 31a...vehicle interior portion, 35...lower frame side expansion portion, 36...front portion, 56...temporary holding means, 57, 57A, 57B...connecting material, 57a...upper connecting portion, 57b...lower connecting portion, 58...sewing thread, 59...adhesive, 60...folded body, 61...(window shielding expansion portion) folded shape, 62...inner roll folded portion, 64...outer roll folded portion, 64a...center, V...vehicle, W (W1, W2)...window, Wu...upper edge, Wd...lower edge, DT...(lower frame part) door trim, Da...upper part, Dat...upper end, Dt...upper end surface, Di...interior side, I...inner side of the vehicle, O...outer side of the vehicle, G...inflation gas, M...head protection airbag device.

Claims

[Claim 1] A head protection airbag device comprising an airbag that is folded and stored along a front-rear direction on an upper edge side of a window on an interior side of a vehicle, and that deploys and inflates downward so as to cover the interior side of the window when inflation gas flows in from an inflator, The airbag includes a window-shielding inflatable portion that covers the interior side of the window when the airbag is fully inflated. The folded shape of the window shielding inflatable portion of the airbag is an inner roll folding portion that rolls and folds the lower edge side of the flatly deployed airbag toward the inside of the vehicle so as to bring the lower edge side of the flatly deployed airbag closer to the upper edge side; an outer roll fold that rolls and folds the inner roll fold toward the outside of the vehicle so as to be close to an upper edge side of the airbag while arranging the inner roll fold toward the center side; The present invention is configured with The window-shielding inflatable portion of the airbag when the inflation is complete is A shielding main body portion disposed on an interior side of the window; a lower frame side expanding portion extending downward from the shielding main body portion and capable of covering the vehicle interior side of the lower frame portion of the window; Equipped with The inner roll-folded portion of the airbag is configured to be unfolded on the vehicle interior side of the upper portion of the lower frame portion when the airbag is deployed and inflated by disposing the inner roll-folded portion of the airbag in the lower frame side inflation portion. the airbag is configured to include a temporary holding means for positioning the inner roll folded portion at the time of deployment and inflation on the vehicle interior side of the upper end of the lower frame portion when the outer roll folded portion is unfolded without hindering the unfolding of the inner roll folded portion, the temporary holding means is composed of a connecting material having a lower connecting portion connected to the inner roll folded portion so as to be capable of being disconnected when the inner roll folded portion is unfolded, and capable of pulling the inner roll folded portion when the outer roll folded portion is unfolded toward the vehicle interior wall portion of the shielding main body portion when the outer roll folded portion is unfolded, and an upper connecting portion connected to the vehicle interior portion of the shielding main body portion above the lower connecting portion, A head protection airbag device characterized in that the connecting material is formed by providing an inverted U-shaped slit in the airbag and is composed of a tongue that is movable relative to the inner roll fold, and the base of the tongue is connected to the inner roll fold as the lower connecting portion.

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