JP7234987B2 - Head protection airbag device - Google Patents

Description

The present invention provides head protection provided with an airbag that is folded and stored on the upper edge side of a window on the inner side of a vehicle, deploys and inflates downward when inflating gas flows in, and covers the inner side of the window. It relates to an airbag device.

Conventionally, in this type of head protection airbag device, the airbag is arranged on the upper edge side and has a cylindrical connection opening connected to an inflator for supplying inflation gas, and a connection opening from the connection opening. A plurality of protection inflatable portions for protecting occupants are arranged side by side in the front-rear direction and are inflated by inflating gas (see, for example, Patent Document 1). Each protective inflatable portion includes an initial inflatable portion arranged on the upper side and inflated by inflating gas, and a main inflatable portion arranged below the initial inflatable portion. Further, the airbag has the initial inflatable portion of each protective inflatable portion arranged as a gas conducting portion that communicates along the front-rear direction and with the inflow portion. Furthermore, the airbag is configured to be stored on the upper edge side of the window as a folded body in which the lower edge side is folded to approach the upper edge side in a flatly deployed state.

In addition, as an airbag for another head protection airbag device, a connection opening is arranged on the upper edge side of the central portion in the front-rear direction, and the vicinity of the connection opening is recessed downward from the front and rear upper edge side. There have been some (see, for example, Patent Document 2).

JP 2018-76026 A JP 2012-140021 A

The airbag in the head protection airbag device of Patent Document 1 has a configuration in which the connection port protrudes upward near the center in the front-rear direction. Therefore, regarding the sheet material (bag base fabric) that forms the airbag, if the constituent part of the connection opening is formed as a continuous integral part with the surrounding constituent parts, The portions of the sheet material before and after the portion constituting the connection port portion become portions to be discarded and are wasted, resulting in a decrease in the yield of the sheet material to be used. On the other hand, as in the airbag of Patent Document 2, if the vicinity of the connection port is recessed downward, it can be constructed without arranging a large space in front and behind the connection port. You can form a bag. However, by forming a recess that is recessed downward on the upper edge side of the airbag, the recess of the recess flows when the inflation gas flowing from the connection port is allowed to flow into the protective inflation portions arranged in parallel in the front-rear direction. There is a risk of hindering the Further, in this type of airbag, when stored on the upper edge side of the window, the folded body is formed so that the lower edge side approaches the upper edge side over the entire front-rear direction. When the airbag is deployed, the unfolding at the concave portion is difficult to be made equal to the unfolding at other portions due to the downward depression, and there was a problem with the deployment performance when the airbag was deployed and inflated. .

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and even if the airbag is provided with a concave portion that is recessed downward on the upper edge side of the airbag, it is possible to improve the deployment performance of the airbag when it is deployed and inflated. It is an object of the present invention to provide a protective airbag device.

The head protection airbag device according to the present invention is folded in the front-rear direction and stored on the upper edge side of a window on the vehicle interior side of a vehicle. Equipped with an airbag that deploys downward to cover the
The airbag is
a cylindrical connection opening disposed on the upper edge side and connected to the inflator;
a plurality of occupant-protecting protective inflatable portions arranged side by side in the front-rear direction and inflated by inflating gas from the connection port;
with
each of the protective bulges,
an initial inflating part disposed on the upper side and inflated by inflating with an inflating gas;
a body inflating portion arranged below the initial inflating portion;
with
The airbag is
disposing the initial inflatable portion of each protective inflatable portion as a gas conducting portion that communicates along the front-rear direction and with the connection opening;
A head protection airbag device configured to be stored in the upper edge side of the window as a folded body in which the lower edge side is folded to approach the upper edge side in a flatly unfolded state,
The airbag is provided with a concave portion recessed downward from the upper edge side portion of the gas conducting portion at the upper edge portion of the gas conducting portion, and
The folded body is
a bellows-folded portion arranged on the upper edge side of the airbag and folded in the vertical direction with folds along the front-rear direction;
a roll-folding portion arranged below the bellows-folding portion for winding the lower edge side of the airbag so as to approach the upper edge side of the airbag;
is configured with
At least one crease along the front-rear direction of the bellows-folded portion is arranged in the region of the gas conducting portion where the recess is arranged.

In the head protection airbag device according to the present invention, when the airbag stored in the upper edge side of the window as a folded body is allowed to flow in the inflation gas from the inflator through the connection port, the gas in the upper edge side of the airbag is caused to flow in through the connection port. Inflating gas flows into the conducting portion, unfolding the bellows-folding portion, and then unfolding the roll-folding portion, so that the airbag is unfolded from the upper edge side to the lower edge side to the window. It expands and inflates so as to cover the inside of the vehicle. When the fold of the bellows fold is removed, the inflation gas accumulates in the vicinity of one fold over the entire length of the airbag in the front-rear direction, and the inflation gas is accumulated in the front-rear direction along the fold. While the inflation gas flows in all directions, the folds are overcome and the folds are removed. Therefore, if a crease along the front-rear direction of the bellows fold is provided along with other portions in the gas conduction portion having the recessed portion, immediately before the crease is unfolded, it can be folded along with the other portions. , the inflation gas accumulates, and after that, the entire area in the front-rear direction of the gas conducting portion, including the portion where the recess is arranged, is substantially equal to overcome the fold and unfold. Unfolding of the lower roll-folded portion is performed substantially equally over the entire front-rear direction of the airbag, so that the deployment and inflation behavior of the airbag is substantially the same over the entire front-rear direction of the airbag. , roll folding can be eliminated up to the lower edge side, and good unfolding performance can be secured.

Therefore, in the head protecting airbag device according to the present invention, even if the concave portion recessed downward is provided on the upper edge side of the airbag, the airbag can be deployed and inflated well.

Further, in the head protection airbag device according to the present invention, the airbag is formed by tubular weaving, and the uneven shape on the upper edge side including the connection opening is substantially fitted point-symmetrically to each other. It is desirable to have a shape that fits.

In such a configuration, regarding the fabric woven by hollow weave (bag base fabric material) when forming the airbag, as the arrangement of the airbag before cutting, the width direction of the fabric is arranged so that a large number of airbags can be taken. A plurality of airbags are arranged side by side, and the upper edge sides of the two airbags are arranged close to each other along the width direction of the fabric and the connection opening side is shifted in the longitudinal direction of the fabric. be able to. At that time, the uneven shape on the upper edge side including the connection opening of the airbag is formed into a point-symmetrical shape that approximately fits each other, and if the airbags are arranged point-symmetrically in the width direction of the fabric , the connecting openings overlap each other along the longitudinal direction of the fabric, so that the separated lower edge sides of the two airbags are brought close to each other in a rectangular region in which they are substantially parallel to each other, and the two airbags are connected. The airbag can be arranged, the waste materials that are wastefully discarded can be reduced, the airbag can be cut from the bag weaving cloth, and the air bag formed by the bag weaving can be manufactured with a good yield.

In the head protection airbag device according to the present invention, the airbag is
the body of the bag,
In order to attach the bag main body to the body side of the upper edge side of the window, the upper edge side of the concave portion arrangement region where the concave portion is arranged and the non-arrangement region where the concave portion is not arranged in the bag main body is provided in the front-rear direction. a plurality of mounting pieces arranged along the bag body, each having a base side coupled to the upper edge side of the bag body and a tip side provided with a mounting hole through which a mounting fixture to be fastened to the body side passes;
with
The folded body is
In addition to being configured to be folded into a substantially cylindrical shape,
The base sides of the attachment piece coupled to the recessed portion arrangement area and the attachment piece coupled to the non-arrangement area are coupled to the same surface side along the axial direction of the folded body on the outer peripheral surface. It is desirable that each of the mounting pieces is arranged so that the tip portion of each of the mounting pieces protrudes upward.

With such a configuration, even if a plurality of attachment pieces are connected to the upper edge side of the bag body extending between the concave portion arrangement area and the non-arrangement area, in the folded body, each attachment piece is attached to the folded body. The mounting pieces have the same protruding form as a specification in which the base portion is coupled to the same surface side along the axial direction on the outer peripheral surface and the tip portion side protrudes upward. Therefore, in such a configuration, there is no difference between the attachment pieces in the concave portion arrangement area and the non-arrangement area. , the folded body can be attached to the body side without twisting.

In this case, the bellows-folded portion of the folded body is formed by providing a plurality of folded portions that are sequentially folded from the upper edge side of the bag body,
The mounting piece provided in the non-arrangement area connects the base portion to the first folding portion on the upper end side, and the mounting piece provided in the recess arrangement area connects to the even-numbered folding portion to be folded. , is arranged by connecting the base part,
The attachment piece disposed in the non-arrangement area is arranged such that the base portion is directed upward with the tip portion side facing one of the vehicle interior side and the vehicle exterior side on the upper edge side of the flatly expanded bag body. If it is configured to be combined,
The mounting piece attached to the recessed area is arranged on the upper edge side of the flatly developed bag body, with respect to the vehicle outer side or the vehicle inner side opposite to the mounting piece disposed in the non-arranged area. , the tip portion side is directed downward, and the base portions are coupled to each other.

In such a configuration, the mounting pieces of the recessed portion arrangement area are connected to the even-numbered folding portions, and when the bag body is deployed and inflated, the connecting portions are positioned on the vehicle exterior side or the vehicle interior side on the opposite side of the first folding portion. , is placed. Therefore, if the tip side of the attachment piece in the concave portion arrangement area is arranged downward on the bag body that is flattened out, when the substantially cylindrical folded body is formed, the attachment piece in the non-arrangement area will be similar to the attachment piece. , can be arranged with the tip portion side facing upward from the root portion.

In this case, it is desirable that the roll-folded portion of the folded body is formed by outer roll-folding that rolls the lower edge side of the bag main body on the side of the vehicle outer wall portion.

In such a configuration, the roll folding portion is an outer roll fold, and when unfolding, the bag body unfolds with the lower edge side of the bag body facing the window side, so even if the space between the passenger and the window is narrow, , the bag body can be expanded smoothly.

1 is a schematic front view of a head protecting airbag device according to an embodiment of the present invention, viewed from the inside of a vehicle; It is the front view which shows the state which expanded the airbag used for embodiment flat, and the front view which overlapped and illustrated the position of the crease|fold of accordion folding. It is a figure explaining the state which forms the folding body of the airbag of embodiment. 1 is a schematic front view showing an airbag assembly of an embodiment before being mounted on a vehicle; FIG. FIG. 5 is a schematic vertical cross-sectional view of the folded body of the airbag of the embodiment, showing the VV portion of FIG. 4; FIG. 5 is a schematic vertical cross-sectional view of the folded body of the airbag of the embodiment, showing the section VI-VI of FIG. 4; FIG. 4 is a schematic vertical cross-sectional view for explaining when the airbag of the embodiment is deployed and inflated, and shows a portion of a non-arrangement region in which no concave portion is provided; FIG. 4 is a schematic vertical cross-sectional view for explaining when the airbag of the embodiment is deployed and inflated, and shows a portion of a concave portion arrangement region; FIG. 4 is a schematic plan view showing the fabric during tubular weaving of the airbag of the embodiment. It is the front view which shows the state which expanded the modification of the airbag of embodiment flat, and the front view which overlapped and illustrated the position of the crease|fold of bellows folding. 11A and 11B are views for explaining a state of forming the folded body of the airbag shown in FIG. 10; FIG. It is the front view which shows the state which expanded the other modified example of the airbag of embodiment flat, and the front view which overlapped and illustrated the position of the crease|fold of bellows folding.

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 has two windows (side windows) W (W1, W2). It is mounted on the vehicle V which has been installed on the vehicle V, and is mounted on the side of the upper edge Wu of the window W (1, 2) inside the vehicle.

The head protection airbag device M includes an airbag 20 , an inflator 17 , a clip 10 , a mounting bracket 14 and an airbag cover 9 . The airbag 20 extends from the lower edge side of the front pillar portion FP to the upper edge side of the rear pillar portion RP via the lower edge side of the roof side rail portion RR on the side of the upper edge Wu of the window W(1, 2) on the inner side of the vehicle V. area is folded and stored along the front-rear direction.

The airbag cover 9 is composed of lower edges of the front pillar garnish 4 arranged on the front pillar portion FP and the roof headlining 5 arranged on the roof side rail portion RR. The front pillar garnish 4 and the roof headlining 5 are made of synthetic resin, and the front pillar part FP and the roof side rail part RR are provided on the inner side of the inner panel 2 on the body 1 (vehicle body) side of the vehicle V, respectively. Mounted and fixed. In addition, the airbag cover 9 covers the vehicle interior side I of the airbag 20 that is folded and stored (see FIGS. 7 and 8) so that the airbag 20 can protrude toward the vehicle interior side when deployed and inflated. , and can be opened toward the vehicle interior side I by being pushed by the airbag 20. - 特許庁

The inflator 17 supplies the inflation gas G (see FIGS. 2, 7, and 8) to the airbag 20. The inflator 17 is of a substantially cylindrical cylinder type, and has a gas discharger (not shown) capable of discharging the inflation gas at the tip side. An exit is provided. The tip of the inflator 17 including the vicinity of the gas discharge port is inserted into a connection port 32 of the airbag 20, which will be described later. connected to. The inflator 17 is attached to the inner panel 2 above the window W2 by bolting a mounting bracket (not shown) for holding the inflator 17 to the inner panel 2 on the body 1 side. Furthermore, the inflator 17 is electrically connected to a control device (not shown) of the vehicle V via a lead wire (not shown). is configured to operate by inputting an actuation signal from the control device.

Each clip 10, as shown in FIGS. 5 and 6, is used to attach a later-described mounting piece 52 of the airbag 20 to the inner panel 2. 11 and the pressing plate portion 11, and is inserted into the mounting hole 2a of the inner panel 2 in the roof side rail portion RR via the mounting hole 54a of the mounting piece 52, which will be described later, and is engaged with the peripheral edge of the mounting hole 2a. and a locking leg portion 12 as a mounting fixture.

Instead of the clip 10, a sheet metal contact plate may be attached to the mounting piece 52. In this case, the nut of the inner panel 2 is inserted through the mounting hole 54a between the contact plate and the mounting piece 52. The mounting piece 52 is mounted on the body 1 side by fastening a mounting bolt as a mounting tool to the mounting hole provided with .

The mounting bracket 14 is attached to the tip of the tension belt 55 attached to the front edge 21c of the airbag 20 (see FIG. 4), and is attached to the inner panel 2 of the front pillar portion FP using the mounting bolt 15. As shown in FIG.

As shown in FIGS. 2 to 6, the airbag 20 includes a bag body 21, a mounting piece 52, a tension belt 55, and an inner tube 33 disposed inside the connection port 32. there is

The bag main body 21 is unfolded from the folded state by allowing the inflation gas G from the inflator 17 to flow into the inside, and the windows W (W1, W2) and the pillar garnishes 6, 7 of the center pillar portion CP and the rear pillar portion RP. When the expansion is completed, the outer shape can cover the vehicle interior I from the window W1 to the front side of the rear pillar RP through the center pillar CP and the window W2. It has a substantially rectangular plate shape with its longitudinal direction substantially aligned with the front-rear direction (see the two-dot chain line in FIG. 1).

In the case of the embodiment, the bag body 21 is manufactured by bag weaving using polyamide thread, polyester thread, or the like. Specifically, as shown in FIG. 9, it is manufactured by cutting a fabric (bag base cloth material) 80 manufactured by tubular weaving.

As shown in FIGS. 7 and 8, the bag main body 21 is filled with an inflation gas so as to separate the vehicle inner side wall portion 30a located on the vehicle inner side I from the vehicle outer side wall portion 30b located on the vehicle outer side O when the inflation is completed. It has a gas inflow portion 30 into which G flows and expands, and a non-inflow portion 45 formed to connect the vehicle inner side wall portion 30a and the vehicle outer side wall portion 30b and into which the inflation gas does not flow. .

As shown in FIG. 2, the gas inlet portion 30 is disposed on the upper edge side and has a cylindrical connection port portion 32 connected to the inflator 17, and an inflation gas G is introduced from the connection port portion 32 for inflation. , and a plurality of occupant protection protection expansion portions 35 (F, C, B) arranged side by side in the front-rear direction. In the case of the embodiment, the connection port 32 is arranged near the middle of the bag body 21 in the front-rear direction and is arranged so as to extend obliquely rearward from the side of the upper edge 21a. The protective expansion portion 35F serves as a portion for protecting the passenger in the front seat of the vehicle, the protective expansion portion 35C serves as a portion for protecting the passenger from the center pillar portion CP, and the protective expansion portion 35B serves as a portion for protecting the passenger in the rear seat. becomes. A trifurcated inner tube 33 having a front outlet 33a and a rear outlet 33b is arranged in the connection port 32 to allow the inflation gas G from the inflator 17 to flow out in both front and rear directions.

Each protective inflation portion 35 (F, C, B) is arranged on the side of the upper portion 20a of the airbag 20 (bag main body 21), and is initially inflated by inflating with the inflating gas G. It comprises a portion 37 (F, C, B) and a body inflating portion 39 (F, C, B) arranged below the initial inflating portion 37 on the side of the lower portion 20b. Further, the bag main body 21 is provided with the initial inflatable portions 37F, 37C, and 37B of the respective protective inflatable portions 35 as a gas conducting portion 41 that communicates with the connecting port portion 32 along the longitudinal direction. there is In the case of the embodiment, the gas conducting portion 41 extends forward on the lower edge 37b side of the initial inflatable portion 37B of the rear protective inflatable portion 35B, and the lower edge side of the gas conducting portion 41 including the portion on the lower edge 37b side extends forward. A portion 41 b is defined as a portion 41 b , and a portion above the portion 41 b is defined as a region of the gas conducting portion 41 .

In this bag body 21, the upper edge side portion 41a of the gas conducting portion 41 is provided with a concave portion 26 that is recessed downward from the upper edge portion (front portion) 41af of the other portion 28, and the upper edge portion that is lowered downward is provided. (Rear side part) 41ab is arranged. That is, the upper edge side portion 41ab of the recessed portion arrangement region 27 in which the recessed portion 26 is arranged is arranged lower than the upper edge side portion 41af of the non-arrangement region 28 in which the recessed portion 26 is not arranged. In the case of the embodiment, the non-placement region 28 is a region on the front side of the connection port 32 , and the recessed region 27 is a region including the placement position of the connection port 32 on the rear side of the non-placement region 28 in the bag body 21 . and

Furthermore, the uneven shape 29 on the side of the upper edge 21a of the airbag 20 provided with the recess 26, that is, the uneven shape 29 including the relatively protruding protrusion 29a in front of the recess 26, including the connection opening 32 , and are shaped so that they are substantially fitted to each other in a point-symmetrical manner. Specifically, as shown in FIG. 9, when cutting the airbag 20 from a fabric (bag base fabric material) 80 manufactured by tubular weaving, the airbag 20 itself is cut along the width direction DW of the fabric 80. If the top and bottom directions are aligned and the adjacent airbags 20(1) and 20(2) are arranged point-symmetrically around the connection port 32, the concave portion 26 of the airbag 20(1) can be obtained. Further, the convex portion 29a on the front side of the concave portion 26 of the airbag 20(2) forms an uneven shape 29 that is substantially fitted.

The non-inflow portion 45 includes a peripheral edge portion 46 forming an outer peripheral edge of the gas inflow portion 30 and closing portions 48 , 49 and 50 disposed within the region of the protective expansion portion 35 .

The closing portion 48 is arranged in an inverted C shape as a front side closing portion 48 on the front portion side of the main body expansion portion 39F of the front protection expansion portion 35F. The closing portion 49 is arranged as a rear side closing portion 49 in a substantially C shape on the front portion side of the main body expansion portion 39B of the rear protection expansion portion 35B. The closing portion 50 is provided as a partition closing portion 50 that partitions the intermediate protective expansion portion 35C and the rear protective expansion portion 35B, and extends upward from the lower edge of the peripheral portion 46 between the main expansion portions 39C and 39B, A vertical line portion 50a that separates the body expansion portions 39C and 39B from each other, and a horizontal line portion 50b that extends forward from the upper end of the vertical line portion 50a and separates the initial expansion portion 37C and the main body expansion portion 39C in the intermediate protective expansion portion 35C. and

The mounting pieces 52 (A, B, C, D) are connected to the upper edge 21a side of the airbag 20 (bag main body 21) by stitching and are arranged at four positions along the front-rear direction. Each mounting piece 52 has a mounting hole 54a through which the locking leg 12 as a mounting member of the clip 10 passes through on the tip 54 side, and the base 53 side is connected to the upper edge 21a side of the bag body 21. I am letting The clip 10 is attached to the mounting hole 2a of the inner panel 2 by passing the locking leg portion 12 as a mounting tool through each mounting hole 54a and locking the locking leg portion 12 to the peripheral edge of the mounting hole 54a. It is configured such that it can be temporarily fixed to the mounting piece 52 until it is mounted.

The attachment pieces 52A and 52B on the front side are attached to the upper edge 21a of the non-placement area 28 where the concave portion 26 on the front side of the connection port 32 is not arranged, that is, the bag body 21 in a state where the bag body 21 is flattened. The base portion 53 is sewn to the vehicle inner side I of the front portion 21aa of the upper edge 21a of the main body 21, and the tip portion 54 side is directed upward.

Further, the mounting pieces 52C and 52D on the rear side are attached to the upper edge 21a of the concave portion arrangement region 27 in which the concave portion 26 including the connection port portion 32 is arranged when the bag main body 21 is expanded flat. A base portion 53 is sewn to the vehicle outer side O of the rear portion 21ab of the upper edge 21a of the bag body 21 . Furthermore, in the case of the embodiment, the attachment pieces 52C and 52D arranged in these concave arrangement regions 27 are arranged such that the direction from the root portion 53 sewn to the rear portion 21ab of the upper edge 21a toward the tip portion 54 is the bag. It is sewn downward on the side of the lower edge 21b of the main body 21 .

In addition, as will be described later, such a sewing specification is such that, when the substantially cylindrical folded body 58 formed by folding the airbag 20 is formed, the axial direction of the outer surface (peripheral surface) 59 of the folded body 58 is Each mounting piece 52 (A, B, C, D) couples the base portion 53 to the vehicle interior side surface 59a along the FC (see FIGS. 3 and 4), and the tip portion 54 side from the base portion 53 is upward. It is for aligning so that it may protrude.

The tension belt 55 is attached to the front edge 21c of the bag body 21, has a mounting hole 55a at its tip for mounting the mounting bracket 14 (see FIGS. 1 and 4), and extends upward at an intermediate portion in the front-rear direction. An auxiliary mounting piece 56 is sewn on as shown. Similar to the mounting piece 52 , the auxiliary mounting piece 56 is provided with a mounting hole 56 a through which the locking leg portion 12 of the clip 10 is inserted so that the auxiliary mounting piece 56 can be mounted on the inner panel 2 .

The airbag 20 is formed as a folded body 58 in which the inner side wall portion 30a and the outer side wall portion 30b are overlapped and folded so that the lower edge 21b of the bag main body 21 is brought closer to the upper edge 21a. , is accommodated on the side of the upper edge Wu of the window W.

As shown in FIGS. 3A to 3C, the folded body 58 is arranged on the side of the upper edge 21a of the airbag 20, and is sequentially folded in the vertical direction while making a plurality of creases 62 and 64 along the front-rear direction. A bellows folded portion 60 provided with a plurality of overlapping folded portions 61 and 63, and a bellows folded portion 60 disposed below the bellows folded portion 60 so as to bring the lower edge 21b side of the airbag 20 closer to the upper edge 21a side of the airbag 20. and a roll-folding portion 70 to be rolled up, and folded into a substantially cylindrical folded shape.

In the case of the embodiment, the roll-folded portion 70 is formed by outer roll-folding in which the lower edge 21b side of the bag body 21 is wound on the vehicle outer wall portion 30b side. In the folding process of the folded body 58, as shown in FIG. 3, the lower edge 21b side is wound by a winding bar (not shown), and the upper edge 21a side is brought closer to the folds 62 and 64. Then, the winding bar is removed and the roll folded portion 70 is pressed against the upper edge 21a to form the bellows folded portion 60 with creases 62 and 64, which is then folded. The tatami mat 58 is folded.

In addition, the bellows-folded portion 60 of the embodiment is folded downward from the upper edge 21a of the bag body 21 via the first folded portion 61 to form a vehicle-interior fold 62 extending in the front-rear direction. It is configured to connect to the roll-folded portion 70 with a vehicle-exterior fold 64 via the overlapping second folded portion 63 . In addition, in the case of the embodiment, the crease 64 at the uppermost position of the recessed portion arrangement region 27 of the recessed portion 26 corresponds to D.D. of FIG. (b), the fold 64 is formed on the outside of the vehicle, and the only fold 64 arranged in the region of the rear side portion 41ab of the gas conducting portion 41 in the concave portion arrangement region 27 is formed into a bellows fold. A portion 60 is formed (see FIG. 2B).

Furthermore, in the substantially cylindrical folded body 58 that has been folded, the attachment pieces 52 (A, B, C, D) are aligned along the axial direction FC of the folded body 58 so that the outside of the folded body 58 is aligned. The base portion 53 is coupled to the vehicle interior side surface 59a of the surface 59, and the tip portion 54 side is directed upward (see FIGS. 3 to 6).

With such a specification, the attachment pieces 52A and 52B provided in the non-placement region 28, which is not the placement region of the recess 26, connect the base portion 53 to the vehicle inner side I on the front side portion 21aa side of the upper edge 21a of the bag body 21. , the tip portion 54 side protrudes upward. In the bellows-folding portion 60 provided above the roll-folding portion 70, the mounting pieces 52 (A, B) are formed in the first folding portion from the front side portion 21aa of the upper edge 21a to the vehicle-interior fold 62 in the bellows-folding. A coupling portion 61a is provided on the surface side of the portion 61, that is, on the vehicle interior side surface 59a of the folded body 58, and the base portion 53 is coupled, and the tip portion 54 side is arranged so as to extend upward. .

On the other hand, in the mounting pieces 52C and 52D provided in the recessed portion arrangement area 27, a connecting portion 63a is provided on the vehicle interior side surface 59a of the folded body 58, and the base portion 53 is connected so that the tip portion 54 side extends upward. , the recessed area 27 is a rear part 21ab where the upper edge 21a side of the bag body 21 is lowered downward from the non-arranged area 28 by the recessed part 26. As shown in FIG. Therefore, even if the bellows-folded portion 60 is provided with the first folded portion 61 and the second folded portion 63 that are sequentially folded with folds 62 and 64 , the first folded portion 61 is The area of the second folded portion 63 that continues to the first vehicle-exterior fold 64 without the area of , becomes the rear side portion 21ab of the bag main body 21 on the side of the upper edge 21a. Further, the surface side of the second folding portion 63 is a portion overlapping with the first folding portion 61 on the lower side of the back side of the first folding portion 61, and when the bellows folding accompanying the deployment and inflation of the bag body 21 is eliminated, the front and back sides of the second folding portion 63 are folded. and upside down. Therefore, the mounting pieces 52 (C, D) provided in the concave portion arrangement area 28 are located on the inner side I of the vehicle where the mounting pieces 52 (A, B) are connected to the upper edge rear side portion 21ab of the flatly developed bag body 21. If the folded body 58 is joined to the surface of the vehicle exterior side O as the reverse of the surface, the vehicle interior side surface 59a ( The base portion 53 is connected to the connecting portion 63a), and is arranged so that the tip portion 54 side extends upward.

Next, the operation of manufacturing the airbag 20, assembling the head protection airbag device M, and mounting it on the vehicle V will be described. To manufacture the airbag 20, first, the inner tube 33 is arranged in the connection opening 32 of the bag main body 21, and the base portion 53 is joined to the upper edge 21a side of the bag main body 21. The attachment pieces 52 (ABC, B) are attached, and the tension belt 55 with the auxiliary attachment pieces 56 is attached to the front edge 21c side of the bag body 21 to form the airbag 20 . Next, as described above, in the flatly deployed state, the outer roll folding is performed on the side of the vehicle outer wall portion 30b so as to bring the lower edge 21b of the airbag 20 closer to the upper edge 21a. The folded roll portion 70 is formed on the side of the lower portion 20b of the airbag 20, and at the same time, on the side of the upper portion 20a (side of the gas conducting portion 41) of the airbag 20, two creases 62 and 64 are formed along the front-rear direction. Folded body 58 is formed by forming bellows fold 60 which folds over itself. Then, the folded body 58 is wrapped with a wrapping material 74 for preventing collapse, and then the clip 10 is attached to each mounting piece 52 (A, B, C, D) and 56, and the mounting bracket is attached to the tip of the tension belt 55. 14, inserting the inflator 17 into the connection port 32, and connecting it to the connection port 32 using the clamp 18, an airbag assembly 75 can be formed (Fig. 4). At this time, the mounting pieces 52 (A, B, C, D) are arranged so as to protrude upward from the folded body 58 .

The airbag assembly 75 formed in this way is mounted by inserting the locking leg portions 12 of the clips 10 into the mounting holes 2a in the corresponding portions of the inner panel 2, and a bracket (not shown) for holding the inflator 17 is attached. Attached to a predetermined portion of the inner panel 2, the attachment bracket 14 of the tension belt 55 is bolted to the inner panel 2 of the front pillar portion FP with bolts 15, and a lead wire (not shown) extending from a control device for operating the inflator is By connecting to the inflator 17, attaching the front pillar garnish 4 and the roof headlining 5 to the inner panel 2 on the side of the body 1, and attaching the pillar garnishes 6 and 7 to the inner panel 2 on the side of the body 1, head protection air The bag device M can be mounted on the vehicle V.

After the head protection airbag device M of the embodiment is mounted on the vehicle V, the inflator 17 is operated upon receiving an operation signal from the control device when the vehicle V undergoes a side collision, oblique collision, or rollover. Then, the inflation gas G (see FIG. 2) discharged from the inflator 17 flows into the bag main body 21, and the inflating bag main body 21 breaks the wrapping material 74, and furthermore, the front pillar garnish 4 and the front pillar garnish 4 are separated. The airbag cover 9, which consists of the lower edge of the roof headlining 5, is pushed open to protrude downward, and the windows W1 and W2 and the center pillar portion are shown in two-dot chain lines in FIG. 1 and in FIGS. It expands greatly so as to cover CP and the vehicle interior side I of the rear pillar portion RP.

At that time, in the head protection airbag device M of the embodiment, the airbag 20 stored as the folded body 58 on the side of the upper edge Wu of the window W receives the inflation gas G from the inflator 17 from the connection port 32. When the inflating gas G flows into the gas conducting portion 41 on the side of the upper edge 21a of the airbag 20, the folding of the bellows folded portion 60 is unfolded, and then the fold of the roll folded portion 70 is unfolded. The bag 20 unfolds from the side of the upper edge 21a to the side of the lower edge 21b and is unfolded and inflated so as to cover the inner side I of the window W. When the folds 62 and 64 of the bellows folds are to be eliminated, the inflation gas G is applied in the vicinity immediately before each of the folds 62 and 64 over the entire length of the airbag 20 in the front-rear direction. The inflation gas G accumulates, and while the inflation gas G flows in the front-rear direction along the folds 62, 64, it overcomes the folds 62, 64 and becomes unfolded (B, C in FIG. 7, and FIG. 8 B and C). Therefore, a crease 64 extending in the front-rear direction of the bellows fold should be provided in the gas conducting portion 41 in which the recessed portion 26 is provided, along with other portions (non-arranged regions in which the recessed portion 26 is not arranged) 28 . For example, just before the crease 64 is unfolded, the inflation gas G accumulates together with the other portion 28, and thereafter, the gas conducting portion 41 including the portion 27 where the concave portion 26 is disposed is arranged in the front-rear direction. The entire area is substantially equally unfolded over the crease 64, and thereafter, the unfolded roll-folded part 70 below is substantially equally unfolded over the entire front-rear direction of the airbag 20. - 特許庁As a result, regarding the behavior of the deployment and inflation of the airbag 20, the folding of the roll fold is eliminated substantially equally up to the lower edge 21b over the entire front-rear direction of the airbag 20, and good deployment performance is achieved. can be secured.

Therefore, in the head protecting airbag device M of the embodiment, even if the concave portion 26 recessed downward is provided on the side of the upper edge 21a of the airbag 20, the deployment performance of the airbag 20 during deployment and inflation is improved. be able to.

In the head protection airbag device M of the embodiment, the airbag 20 is formed by tubular weaving, and the uneven shape on the side of the upper edge 21a including the connection opening 32 is arranged point-symmetrically with each other. It has a shape that fits together.

Therefore, in the embodiment, as shown in FIG. 9, regarding the bag weave fabric (bag base fabric material) 80 when forming the airbag 20, the arrangement of the airbag 20 before cutting is such that a large number of pieces can be taken. In addition, a plurality of airbags 20 are arranged side by side in the width direction DW of the fabric 80, and the upper edges 21a sides of the two airbags 20 are arranged along the width direction DW of the fabric 80 and connected to each other. The part 32 side can be shifted in the longitudinal direction DL of the fabric 80 and arranged close to each other. At this time, the airbag 20 has a shape in which the uneven shape (the shape provided with the concave portion 26 and the convex portion 29a) 29 on the side of the upper edge 21a including the connection opening portion 32 is substantially fitted point-symmetrically. When the airbags 20 are arranged point-symmetrically in the width direction DW of the fabric 80, the connection openings 32 overlap each other along the longitudinal direction DL of the fabric 80, so that the two airbags 20 are separated. The two airbags 20 can be placed close to each other in the rectangular region BG in which the substantially linear lower edges 21b are substantially parallel to each other, and the waste material 81 that would otherwise be wastefully discarded can be eliminated. The airbag 20 (the bag main body 21) can be cut from the tubular weave cloth 80, and the airbag 20 formed by tubular weaving can be manufactured with a high yield.

Of course, even in an airbag made of a sewn bag formed by stacking two bag base fabric materials and sewing the outer peripheral edges to each other, the uneven shape on the side of the upper edge 21a including the connection opening 32 (the recess 26 and If the shape 29 provided with the convex portion 29a is provided, it can contribute to reducing the residual material of the base cloth material for the bag. Furthermore, even in the case of a sewn bag, by providing bellows folds in the gas-conducting portion of the recessed portion arrangement area, the unfolding performance of the recessed portion arranged region can be improved even if the recessed portion is provided.

Further, in the head protecting airbag device M of the embodiment, the airbag 20 is configured including the bag main body 21 and the mounting pieces 52 (A, B, C, D). The mounting pieces 52 (A, B, C, and D) are formed in a concave portion arrangement region 27 where the concave portion 26 is arranged in the bag body 21 and a concave portion in order to mount the bag body 21 on the side of the body 1 on the upper edge Wu side of the window W. 26 are arranged along the front-back direction on the upper edge 21a side of the non-arranged area 28, and the base portion 53 side is on the upper edge 21a (21aa, 21ab) side of the bag main body 21. , and a mounting hole 54a is provided on the side of the tip portion 54, through which the mounting fixture 12 to be fastened to the body 1 side passes. In addition, the folding body 58 is configured to be folded into a substantially cylindrical shape, and the attachment pieces 52 (C, D) coupled to the recessed portion arrangement area 27 and the attachment pieces 52 (A, D) coupled to the non-arrangement area 28 are arranged. B) is joined to the same surface 59a side along the axial direction FC of the folded body 58 on the outer surface 59, and the tip of each mounting piece 52 (A, B, C, D) Each mounting piece 52 (A, B, C, D) is arranged so that the portion 54 protrudes upward.

Therefore, in the embodiment, even if a plurality of attachment pieces 52 are coupled to the upper edge 21a side of the bag body 21 across the concave portion arrangement area 27 and the non-arrangement area 28, the folded folded body 58 does not have each attachment piece. Pieces 52 (A, B, C, D) connect the base portion 53 to the same surface 59a along the axial direction FC of the outer surface 59 of the folded body 58, and protrude upward on the tip portion 54 side. As a specification to allow the mounting pieces 52 (A, B, C, D) to have the same projecting form. Therefore, in such a configuration, the mounting pieces 52 (C, D) and 52 (A, B) of the concave portion arrangement area 27 and the non-arrangement area 28 are simply equivalently attached to each other without any difference. The folding body 58 can be attached to the body 1 side without twisting by simply fastening the portion 54 to the body 1 side using the fixture 12 .

In particular, in the case of the embodiment, the bellows-folded portion 60 of the folded body 58 is formed by providing a plurality of folded portions 61 and 63 that are sequentially folded from the side of the upper edge 21a of the bag body 21. The piece 52 (A, B) connects the base portion 53 to the first folding portion 61 on the upper end side, and the mounting piece 52 (C, D) provided in the recessed portion arrangement area 27 is folded even-numbered (implemented). The base portion 53 is connected to the folded portion 63 (second in form). Then, the mounting pieces 52 (A, B) arranged in the non-arrangement area 28 are arranged so that the front end portion 54 side of the upper edge 21a (front side portion 21aa) of the bag main body 21 that is flattened out is positioned toward the inner side I of the vehicle. The attachment pieces 52 (C, D) attached to the concave portion arrangement area 27 are configured to connect the base portion 53 upward, and the upper edge 21a (rear side portion 21ab) of the bag main body 21 that is flattened out. on the side of the vehicle opposite to the mounting pieces 52 (A, B) arranged in the non-arrangement area 28, the tip portion 54 side is directed downward, and the base portion 53 is coupled. ing.

Therefore, in the embodiment, the mounting pieces 52 (C, D) of the recessed portion arrangement area 27 are connected to the even-numbered (second) folded portions 63, and the connecting portions 63a are used to expand and inflate the bag body 21. When the bellows folding associated with the folding is canceled, it is arranged on the vehicle outer side O on the opposite side of the first folding portion 61 . Therefore, in the attachment pieces 52 (C, D) of the concave portion arrangement area 27, if the tip portion 54 side is arranged downward on the bag main body 21 that is flattened, the substantially cylindrical folded body 58 is formed. As with the attachment pieces 52 (A, B) of the non-arrangement area 28, the base portion 53 to the tip portion 54 side can be arranged upward.

In this case, in the embodiment, the roll-folded portion 70 of the folded body 58 is formed by outer roll-folding in which the lower edge 21b side of the bag body 21 is wound around the vehicle outer wall portion 30b side.

Therefore, in the embodiment, the roll-folding part 70 is an outer roll-fold, and when unfolding, the bag body 21 unfolds with the lower edge 21b side of the bag body 21 facing the window W (W1, W2) side. Therefore, even if the space between the occupant and the window W is narrow, the bag body 21 can be smoothly deployed.

In the case of the embodiment, the root portions 53 of the mounting pieces 52 (C, D) provided in the recessed portion arrangement region 27 are connected to the even-numbered folded portions 63 of the folded portions of the bellows folded portion 60. 10 and 11, the bellows-folded portion 60A of the folded body 58A is joined to the odd-numbered (third in the illustrated case) folded portion 65. In this case, similarly to the mounting pieces 52 (A, B) to be connected to the first folded portion 61, the base portion 53 is connected to the vehicle inner side I on the upper edge 21a (rear side portion 21ab) side, and the tip portion 54 should be directed upward.

That is, in the folded body 58A, the bag main body 21 is the same as that of the embodiment, and the bellows-folded portion 60A has the first folded portion 61 arranged from the upper end side, and the first folded portion 61 to the first vehicle inner fold. 62, the second folding portion 63 is arranged, the third folding portion 65 is arranged from the second folding portion 63 through the first vehicle outside fold 64, and the third folding portion 65 is arranged to the second vehicle inside fold. 66 , a fourth folded portion 67 is arranged, and the fourth folded portion 67 continues to the roll folded portion 70 via a second vehicle-outside fold 68 .

Two folds 66 , 68 , a second inner side fold 66 and a second outer side fold 68 , are arranged in the gas conducting portion 41 of the concave portion arrangement region 27 .

In such a folded body 58A of the airbag 20A, the mounting pieces 52 (A, B) provided in the non-arrangement area 28 are attached to the vehicle inner side I of the upper edge 21a (front side portion 21aa) of the bag main body 21 (accordion folding portion In 60A, the surface of the first folded portion 61), a connecting portion 61a is provided, the base portion 53 is connected, the tip portion 54 side is directed upward, and the mounting piece 52 provided in the recessed portion arranging region 27 (C, D) provide a connecting portion 65a on the inner side I of the upper edge 21a (rear side portion 21ab) of the bag main body 21 (the surface of the third folded portion 65 in the bellows folded portion 60A), and the base portion 53 are combined so that the tip portion 54 side is directed upward, the mounting pieces 52 (A, B, C, D) are projected on the inner side surface 59a of the outer surface 59 of the folding body 58A. , with the tip 54 side facing upward. That is, the connecting portions 65a to which the mounting pieces 52 (C, D) provided in the concave portion arrangement region 27 are connected are provided on the surface side of the odd-numbered third folded portions 65, and the surface side of the folded portions 65 This is because, like the one-fold portion 61, it is arranged on the inner side I of the vehicle.

Of course, in this airbag 20A as well, the folded body 58A can align the protrusion specifications of the mounting pieces 52 (A, B, C, D) with the tip end 54 side facing upward, thereby preventing twisting. can be easily attached to the vehicle. In addition, two creases 66 and 68 are provided in the recessed portion arrangement area 27 , so that the unfolding performance of the recessed portion arranged area 28 can be improved similarly to the non-arranged area 27 .

In addition, in the embodiment, the concave portion 26 provided on the side of the upper edge 21a of the airbag 20 is set including the arrangement area of the connection port portion 32, but like the bag body 21B of the airbag 20B shown in FIG. The connection opening portion 32 may be arranged in the non-arrangement region 28 where the concave portion 26 is not arranged. In this airbag 20B, the bellows folding folds are the first and second vehicle inner side folds 62 and 66 and the first and second vehicle outer side folds 64 and 68 as in the airbag 20A of FIGS. The folding body is formed in the same folding process only by providing the folding member.

DESCRIPTION OF SYMBOLS 1... Body 10... Clip 11... Pressing plate part 12... (Mounting tool) locking leg part 17... Inflator 20, 20A, 20B... Airbag, 20a... Upper part, 21, 21B... Bag main body, 21a... Upper edge 21aa... Front part 21ab... Rear part 21b... Lower edge 26, 26B... Concave part 27... Concave part arrangement area 28... Non-arrangement area 29... Uneven shape 29a... Convex part 30 Gas inflow portion 30a Inner side wall portion 30b Outer side wall portion 32, 32B Connection port portion 35 (F, C, B) Protective expansion portion 37 (F, C, B) Initial expansion Part 39 (F, C, B)... Main body expansion part 41... Gas conduction part 45... Non-inflow part 52 (A, B, C, D)... Mounting piece 53... Base part 54... Tip part , 54a... Mounting hole 58, 58A... Folded body 59... Outer surface 59a... Car interior side surface 60, 60A... Accordion folded part 61... First folded part 61a... Coupling (of mounting pieces 52A and 52B) Parts 62... (first) car-interior fold 63... second fold 63a... coupling part (of mounting pieces 52C and 52D) 64... (first) car-outside fold 65... third fold , 65a (attachment pieces 52C, 52D) joint portion, 66 (second) vehicle-inside fold, 67 4th fold, 68 (second) vehicle-outside fold, 70 roll fold,
V... vehicle, W (W1, W2)... window, Wu... upper edge, I... inner side of vehicle, O... outer side of vehicle, FC... axial direction of (folded body), G... inflation gas, M... head protection airbag device.

Claims (3)

An airbag that is folded in the front-rear direction and stored on the upper edge side of a window on the inner side of a vehicle, and that deploys and inflates downward so as to cover the inner side of the window when inflation gas flows from an inflator. prepared,
The airbag is
a cylindrical connection opening disposed on the upper edge side and connected to the inflator;
a plurality of occupant-protecting protective inflatable portions arranged side by side in the front-rear direction and inflated by inflating gas from the connection port;
with
each of the protective bulges,
an initial inflating part disposed on the upper side and inflated by inflating with an inflating gas;
a body inflating portion arranged below the initial inflating portion;
with
The airbag is
disposing the initial inflatable portion of each protective inflatable portion as a gas conducting portion that communicates along the front-rear direction and with the connection opening;
A head protection airbag device configured to be stored in the upper edge side of the window as a folded body in which the lower edge side is folded to approach the upper edge side in a flatly unfolded state,
The airbag is
the body of the bag,
a concave portion disposed at the upper edge side portion of the gas conducting portion in the bag body and recessed downward from the upper edge side portion of the other portion ;
In order to attach the bag main body to the body side of the upper edge side of the window, the upper edge side of the concave portion arrangement region where the concave portion is arranged and the non-arrangement region where the concave portion is not arranged in the bag main body is provided in the front-rear direction. a plurality of mounting pieces arranged along the bag body, each having a base side coupled to the upper edge side of the bag body and a tip side provided with a mounting hole through which a mounting fixture to be fastened to the body side passes;
with
The folded body is
It is folded into a substantially cylindrical shape,
a bellows-folded portion arranged on the upper edge side of the airbag and folded in the vertical direction with folds along the front-rear direction;
a roll-folding portion arranged below the bellows-folding portion for winding the lower edge side of the airbag so as to approach the upper edge side of the airbag;
is configured with
At least one fold along the front-rear direction of the bellows-folded portion is disposed in the area of the gas conducting portion in which the recess is disposed ,
The base sides of the attachment piece coupled to the recessed portion arrangement area and the attachment piece coupled to the non-arrangement area are coupled to the same surface side along the axial direction of the folded body on the outer peripheral surface. and each mounting piece is arranged so that the tip portion of each mounting piece protrudes upward,
The bellows-folded portion of the folded body is formed by providing a plurality of folded portions sequentially folded from the upper edge side of the bag body,
The mounting piece provided in the non-arrangement area connects the base portion to the first folding portion on the upper end side, and the mounting piece provided in the recess arrangement area connects to the even-numbered folding portion to be folded. Disposed by coupling the base portion,
The attachment piece disposed in the non-arrangement area joins the base portion with the tip side facing upward to one of the vehicle inner side and the vehicle outer side on the upper edge side of the flatly expanded bag body. let
The mounting piece attached to the recessed area is positioned on the upper edge side of the flatly developed bag body, with respect to the vehicle outer side or the vehicle inner side opposite to the mounting piece disposed in the non-arranged area. 1. A head protection airbag device, wherein said base portion is joined with said tip side facing downward . 2. The airbag is formed by tubular weaving, and the uneven shape on the upper edge side including the connection opening is formed into a shape that substantially fits with each other in a point-symmetrical manner. A head protection airbag device as described. 3. The head protection according to claim 1 or 2, wherein the roll-folded portion of the folded body is formed by outer roll-folding that rolls the lower edge side of the bag body on the vehicle outer wall portion side. airbag device.

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