JP2021160395A - Head protection airbag device - Google Patents

Abstract

To provide a head protection airbag device which exhibits excellent deployment performance of an airbag, although a recess depressed downward is disposed on an upper edge side of the airbag.SOLUTION: An airbag 20 comprises: a connection port part 32 of an upper edge side to be connected to an inflator for inflation gas supply; and protection inflation parts 35 juxtaposed in a fore-and-aft direction. Each protection inflation part includes: an initial inflation part 37 of an upper part 20a side; and a body inflation part 39 of a lower part 20b side. The initial inflation part of each protection inflation part is communicated along the fore-and-aft direction and becomes a gas conduction part 41 for communicating with the connection port part. In the airbag, a recess 26 depressed downward is disposed at an upper edge side site of the gas conduction part. A folded body of the airbag includes: a bellows-folding part which is folded and superposed by attaching creases along the fore-and-aft direction; and a roll-folding part which winds a lower edge side of the airbag to the upper edge side. At least one of the creases 62 and 64 of the bellows-folding parts is arranged in a region of the gas conduction part where the recess is disposed.SELECTED DRAWING: Figure 2

Description

The present invention is head protection provided with an airbag that is folded and stored on the upper edge side of a window inside the vehicle and expands downward when expansion gas flows in to cover the inside of the window. Regarding airbag devices.

Conventionally, in this type of head protection airbag device, the airbag is arranged on the upper edge side and is connected to an inflator for supplying expansion gas from a tubular connection port and a connection port. It was configured to include a protective expansion portion for protecting occupants, which is expanded by inflowing an expansion gas and is arranged side by side in the front-rear direction (see, for example, Patent Document 1). Each protective expansion portion is provided with an initial expansion portion that is arranged on the upper side and expands by inflowing an expansion gas, and a main body expansion portion that is arranged below the initial expansion portion. Further, the airbag is arranged as a gas conducting portion that communicates the initial expansion portion of each protective expansion portion along the front-rear direction and communicates with the inflow port portion. Furthermore, the airbag was configured to be housed on the upper edge side of the window as a folded body in which the lower edge side was folded so as to approach the upper edge side in a flatly deployed state.

Further, as an airbag of another head protection airbag device, a connection port is arranged on the upper edge side of the central portion in the front-rear direction, and the vicinity of the connection port is recessed downward from the front-rear upper edge side. (See, for example, Patent Document 2).

JP-A-2018-76026 Japanese Unexamined Patent Publication No. 2012-140021

The airbag in the head protection airbag device of Patent Document 1 has a configuration in which the connection port portion protrudes upward near the center in the front-rear direction, and there is a space in front of and behind the connection port portion on the upper edge side of the airbag. With respect to the sheet material (base cloth for the bag) forming the airbag, when the constituent part of the connection port is formed as a continuous integral body with the surrounding constituent parts, The parts before and after the component part of the connection port portion in the sheet material become the parts to be discarded and are wasted, and the yield of the sheet material to be used is deteriorated. On the other hand, as in the case of the airbag of Patent Document 2, if the vicinity of the connection port is recessed downward, it can be configured without arranging a large space in front of and behind the connection port, so that air can be obtained from a predetermined sheet material with good yield. Can form a bag. However, if a recess that is recessed downward is formed on the upper edge side of the airbag, the recess of the recess flows when the expansion gas that flows in from the connection port is made to flow into each protective expansion portion that is arranged side by side in the front-rear direction. There is a risk of hindering. Furthermore, in this type of airbag, when stored on the upper edge side of the window, a foldable body is formed that folds the lower edge side closer to the upper edge side over the entire area in the front-rear direction. Since the folds at the recessed part are dented downward, it is difficult to eliminate the folds at other parts, and there is a problem with the deployment performance of the airbag when it is expanded and expanded. ..

The present invention solves the above-mentioned problems, and even if a recess recessed downward is provided on the upper edge side of the airbag, the head can improve the deployment performance of the airbag during deployment and expansion. 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 and stored along the front-rear direction on the upper edge side of the window inside the vehicle, and when the expansion gas flows in from the inflator, the inside of the window is inside the vehicle. Equipped with an airbag that expands downward to cover the
The airbag
A cylindrical connection port arranged on the upper edge side and connected to the inflator, and
A protective expansion unit for occupant protection, which is expanded by inflowing expansion gas from the connection port and is arranged side by side in the front-rear direction,
With
Each of the protective expansion parts
An initial expansion part that is placed on the upper side and expands by inflowing expansion gas,
A main body expansion portion arranged below the initial expansion portion,
With
The airbag
The initial expansion portion of each protection expansion portion is arranged as a gas conduction portion that communicates with the connection port portion in the front-rear direction.
A head protection airbag device configured to be housed on the upper edge side of the window as a folded body folded so that the lower edge side approaches the upper edge side in a flatly unfolded state.
The airbag is provided with a recess, which is recessed downward from the upper edge side portion of another portion, at the upper edge side portion of the gas conduction portion.
The folded body
A bellows fold portion that is arranged on the upper edge side of the airbag, has creases along the front-rear direction, and is folded in the vertical direction.
A roll fold portion that is arranged below the bellows fold portion and that winds the lower edge side of the airbag so as to approach the upper edge side of the airbag.
As well as being configured with
It is characterized in that at least one crease along the front-rear direction of the bellows-folded portion is arranged in the region of the gas conductive portion in which the recess is arranged.

In the head protection airbag device according to the present invention, when the airbag housed on the upper edge side of the window as a folded body allows the expansion gas from the inflator to flow in from the connection port, the gas on the upper edge side of the airbag. The expansion gas flows into the conductive part, and the fold of the bellows fold part is canceled, and then the fold of the roll fold part is canceled. It expands and expands so as to cover the inside of the car. Then, when the crease of the bellows fold is eliminated, the expansion gas accumulates in the vicinity of just before one fold over the entire area in the front-rear direction of the airbag, and before and after the fold. While the expansion gas flows in the direction, the behavior is such that the fold is overcome and the fold is eliminated. Therefore, if a crease along the front-rear direction of the bellows fold is arranged together with other parts in the gas conductive portion in which the recess is arranged, the crease is arranged together with the other part immediately before the fold is canceled. , The expansion gas is accumulated, and after that, the entire area of the gas conduction part in the front-rear direction, including the portion where the recess is arranged, overcomes the fold and eliminates the fold, and then the fold is eliminated. Folding of the lower roll fold is performed almost equally over the entire area in the front-rear direction of the airbag, and the behavior of the expansion and expansion of the airbag is approximately the same over the entire area in the front-rear direction of the airbag. , The roll fold is eliminated up to the lower edge side, and good deployment performance can be ensured.

Therefore, in the head protection airbag device according to the present invention, the deployment performance of the airbag at the time of deployment and expansion can be improved even if a recess recessed downward is provided on the upper edge side of the airbag.

Then, in the head protection airbag device according to the present invention, the airbag is formed by bag weaving, and the uneven shape on the upper edge side including the connection port portion is approximately fitted to each other in a point-symmetrical manner. It is desirable that the shape matches.

In such a configuration, with respect to the fabric woven by bag weaving (base fabric material for bags) when forming the airbag, the arrangement of the airbags before cutting is such that a large number of airbags can be taken in the width direction of the fabric. A plurality of airbags are arranged side by side, and the upper edge sides of the two airbags are arranged so as to be close to each other along the width direction of the fabric and the connection port side is shifted in the longitudinal direction of the fabric. be able to. At that time, the airbags have a shape in which the uneven shape on the upper edge side including the connection port is point-symmetrically and substantially fits with each other, and when the airbags are arranged point-symmetrically in the width direction of the fabric. , The connection ports overlap each other along the longitudinal direction of the fabric, so the two airbags are brought closer to the rectangular area where the separated lower edge sides of the two airbags are approximately parallel to each other. The airbag can be cut from the bag-woven fabric by reducing the amount of residual material that can be arranged and wasted, and the airbag formed by the bag-weaving can be manufactured with good yield.

Then, in the head protection airbag device according to the present invention, the airbag is
With the bag body
In order to attach the bag body to the body side on the upper edge side of the window, in the front-rear direction on the upper edge side of the recess arrangement area in which the recess is arranged and the non-arrangement area in which the recess is not arranged. A plurality of mounting pieces are arranged along the line, and a mounting piece having a base side connected to the upper edge side of the bag body and a mounting hole provided on the tip side for passing a mounting tool to be fastened to the body side.
With
The folded body
In addition to being configured to be folded into a substantially columnar shape,
The base side of the mounting piece coupled to the recessed arrangement region and the mounting piece coupled to the non-arrangement region is coupled to the same surface side of the outer peripheral surface along the axial direction of the folded body. It is desirable that the mounting pieces are arranged so that the tip portion of each mounting piece protrudes upward.

In such a configuration, even if a plurality of mounting pieces are connected to the upper edge side of the bag body extending over the recessed placement area and the non-placement area, in the folded foldable body, each mounting piece is a foldable body. The protruding form of each mounting piece is the same as the specification that the base portion is connected to the same surface side along the axial direction on the outer peripheral surface and the tip portion side is projected upward. Therefore, in such a configuration, the tip portion is simply and equally fastened to the body side by using the attachment tool without providing a difference between the attachment pieces in the recessed arrangement area and the non-arrangement area. , The foldable body can be attached to the body side without causing twisting.

In this case, the bellows-folded portion of the folded body is formed by providing a plurality of folded portions that are folded in order from the upper edge side of the bag body.
The mounting piece provided in the non-arrangement region connects the base portion to the first folding portion on the upper end side, and the mounting piece provided in the recessed arrangement region is formed in the even-numbered folded portion to be folded. , The base parts are joined and arranged,
The mounting piece disposed in the non-arranged region has the front end side facing upward with respect to one side of the vehicle inside or the vehicle outside on the upper edge side of the bag body that is spread flat. If it is configured to be combined,
The mounting piece attached to the recessed area is relative to the vehicle outer side or the vehicle inner side opposite to the mounting piece arranged in the non-arrangement area on the upper edge side of the bag body unfolded flat. , The tip portion side is directed downward, and the base portion is joined and arranged.

In such a configuration, the mounting piece of the recessed arrangement area is connected to the even-numbered folding portion, and the connecting portion is connected to the outside of the vehicle or the inside of the vehicle on the opposite side of the first folding portion when the bag body is expanded and expanded. Is placed in. Therefore, if the tip side of the mounting piece in the recessed area is arranged downward on the flatly deployed bag body, when the folded body is formed into a substantially columnar shape, the mounting piece in the non-placed area is the same as the mounting piece in the non-placed area. , The tip side can be arranged upward from the base part.

In this case, it is desirable that the roll folding portion of the folded body is formed by an outer roll folding portion in which the lower edge side of the bag body is wound on the side of the outer wall portion of the vehicle.

In such a configuration, the roll fold portion is an outer roll fold, and when the fold is unfolded, the bag body expands with the lower edge side of the bag body facing the window side, so that even if the space between the occupant and the window is narrow. , The bag body can be expanded smoothly.

It is a schematic front view which looked at the head protection airbag apparatus of one Embodiment of this invention from the inside of a vehicle. It is a front view which shows the state in which the airbag used for an embodiment is flatly unfolded, and is the front view which superposed the position of the fold of the bellows fold. It is a figure explaining the state which forms the folding body of the airbag of an embodiment. It is a schematic front view which shows the airbag assembly body of the airbag of an embodiment before mounting on a vehicle. It is a schematic vertical sectional view of the folding body of the airbag of an embodiment, and shows the VV part of FIG. It is a schematic vertical sectional view of the folding body of the airbag of an embodiment, and shows the VI-VI part of FIG. It is a schematic vertical cross-sectional view explaining the expansion expansion time of the airbag of an embodiment, and shows the part of the non-arrangement region which does not provide a recess. It is a schematic vertical cross-sectional view explaining the expansion and expansion time of the airbag of an embodiment, and shows the part of the recess arrangement region. It is a schematic plan view which shows the fabric at the time of bag weaving of the airbag of an embodiment. It is a front view which shows the state which showed the modified example of the airbag of an embodiment flat unfolded, and is the front view which superposed the position of the fold of the bellows fold. It is a figure explaining the state which forms the folding body of the airbag shown in FIG. It is a front view which shows the state which showed the other modification of the airbag of an embodiment flat unfolded, and is the front view which superposed the position of the fold of the bellows fold.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the head protection airbag device M of the embodiment has two windows (side windows) W (W1, W2). It is mounted on the vehicle V, and is mounted on the upper edge Wu side of the windows 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 is on the upper edge Wu side of the windows W (1, 2) inside the vehicle V, from the lower edge side of the front pillar portion FP, through the lower edge side of the roof side rail portion RR, and above the rear pillar portion RP. It is folded and stored along the front-back direction up to the area of.

The airbag cover 9 is composed of lower edges of a front pillar garnish 4 arranged on the front pillar portion FP and a roof head lining 5 arranged on the roof side rail portion RR. The front pillar garnish 4 and the roof head lining 5 are made of synthetic resin, and the front pillar portion FP and the roof side rail portion RR are provided on the inside of the inner panel 2 on the body 1 (body) side of the vehicle V, respectively. It is mounted and fixed. Further, the airbag cover 9 covers the vehicle interior I of the airbag 20 that is folded and stored (see FIGS. 7 and 8) so that the airbag 20 can be projected downward inside the vehicle when expanded and expanded. , It is configured so that it can be opened to the inside I of the vehicle by being pushed by the airbag 20.

The inflator 17 supplies the expansion gas G (see FIGS. 2, 7 and 8) to the airbag 20. The inflator 17 is a substantially cylindrical cylinder type and can discharge the expansion gas to the tip side, which is not shown. The outlet is arranged. The inflator 17 inserts the tip side including the vicinity of the gas discharge port into the connection port portion 32 described later of the airbag 20, and uses a clamp 18 arranged on the outer peripheral side of the connection port portion 32 to insert the inflator 17 into the airbag 20. It is connected to the other. Further, the inflator 17 is attached at a position above the window W2 of the inner panel 2 by bolting a mounting bracket (not shown) holding the inflator 17 to the inner panel 2 on the body 1 side. Further, the inflator 17 is electrically connected to a control device (not shown) of the vehicle V via a lead wire (not shown), and when the control device detects a side collision, an oblique collision, a rollover, or the like of the vehicle V. Is configured to operate by inputting an operation signal from the control device.

As shown in FIGS. 5 and 6, each clip 10 is used to attach the mounting piece 52 described later of the airbag 20 to the inner panel 2, and in the case of the embodiment, it is made of synthetic resin and is made of a holding plate. It is held by the portion 11 and the holding plate portion 11, 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 described later, and is locked to the peripheral edge of the mounting hole 2a. It is configured to include a locking leg portion 12 as a mounting tool to be attached.

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

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

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 in a connection port 32. There is.

The bag body 21 allows the expansion gas G from the inflator 17 to flow into the inside and unfolds from the folded state, and the pillar garnishes 6 and 7 of the windows W (W1, W2), the center pillar portion CP and the rear pillar portion RP. It is configured to cover the inside I of the car, and when the expansion is completed, the outer shape can cover the inside I of the car from the window W1 through the center pillar portion CP and the window W2 to the front side of the rear pillar portion RP. It has a substantially rectangular plate shape with the longitudinal direction substantially along 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 yarn, polyester yarn, or the like. Specifically, as shown in FIG. 9, it is manufactured by cutting a fabric (base cloth material for a bag) 80 manufactured by bag weaving.

As shown in FIGS. It has a gas inflow portion 30 that expands by inflowing G, and a non-inflow portion 45 that is formed so as to connect the vehicle inner side wall portion 30a and the vehicle outer wall portion 30b and does not allow the expansion gas to flow in. ..

As shown in FIG. 2, the gas inflow portion 30 is arranged on the upper edge side and expands by inflowing expansion gas G from the cylindrical connection port 32 connected to the inflator 17 and the connection port 32. However, it is configured to include a plurality of protective expansion portions 35 (F, C, B) for protecting occupants, which are arranged side by side in the front-rear direction. In the case of the embodiment, the connection port portion 32 is arranged near the middle of the bag main body 21 in the front-rear direction, and is arranged so as to extend diagonally rearward from the upper edge 21a side. The protective expansion part 35F is a part that protects the occupants in the front seat of the vehicle, the protective expansion part 35C is a part that protects the occupants from the center pillar part CP, and the protective expansion part 35B is a part that protects the occupants in the rear seats. Will be. Inside the connection port 32, a three-pronged inner tube 33 having a front side outlet 33a and a rear side outlet 33b for flowing out the expansion gas G from the inflator 17 to both front and rear sides is arranged.

Each of the protective expansion portions 35 (F, C, B) is arranged on the upper portion 20a side of the airbag 20 (bag body 21), and the initial expansion is expanded by inflowing the expansion gas G. It is configured to include a portion 37 (F, C, B) and a main body expansion portion 39 (F, C, B) arranged below the initial expansion portion 37 on the lower portion 20b side. Further, the bag body 21 is arranged as a gas conduction portion 41 that communicates the initial expansion portions 37F, 37C, 37B of each protection expansion portion 35 along the front-rear direction and also communicates with the connection port portion 32. There is. In the case of the embodiment, the gas conduction portion 41 extends the lower edge 37b side of the initial expansion portion 37B of the rear protection expansion portion 35B forward, and includes the portion on the lower edge 37b side thereof, and includes the lower edge side of the gas conduction portion 41. The portion 41b is designated, and the portion above the portion 41b is designated as the region of the gas conductive portion 41.

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

Further, the concave-convex shape 29 on the upper edge 21a side of the airbag 20 provided with the concave portion 26, that is, the concave-convex shape 29 including the relatively protruding convex portion 29a in front of the concave portion 26 includes the connection port portion 32. Therefore, the shape is point-symmetrical and substantially fits with each other. More specifically, as shown in FIG. 9, when the airbag 20 is cut by the fabric (base fabric material for bag) 80 manufactured by bag weaving, the airbag 20 itself is cut along the width direction DW of the fabric 80. If the vertical directions are aligned and the adjacent airbags 20 (1) and 20 (2) are arranged in a point-symmetrical arrangement with the vicinity of the connection port 32 as the center, the recess 26 of the airbag 20 (1) is arranged. In addition, the convex portion 29a on the front side of the concave portion 26 in the airbag 20 (2) has a concave-convex shape 29 that is substantially fitted.

The non-inflow portion 45 includes a peripheral edge portion 46 that constitutes the outer peripheral edge of the gas inflow portion 30, and closed portions 48, 49, 50 that are arranged in the region of the protective expansion portion 35.

The closing portion 48 is arranged as a front closing portion 48 in an inverted C shape on the front side of the main body expanding portion 39F of the front protective expanding portion 35F. The closing portion 49 is arranged as a rear closing portion 49 on the front side of the main body expanding portion 39B of the rear protection expanding portion 35B in a substantially C shape. The closing portion 50 is arranged as a compartment closing portion 50 for partitioning the middle protection expansion portion 35C and the rear protection expansion portion 35B, and extends upward from the lower edge of the peripheral edge portion 46 between the main body expansion portions 39C and 39B. A vertical line portion 50a that separates the main 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 medium protection expansion portion 35C. And is configured with.

The attachment pieces 52 (A, B, C, D) are joined to the upper edge 21a side of the airbag 20 (bag body 21) by sutures and are arranged at four locations along the front-rear direction. Each mounting piece 52 is provided with a mounting hole 54a on the tip end portion 54 side through which the locking leg portion 12 as a mounting tool for the clip 10 is penetrated, and the base portion 53 side is coupled to the upper edge 21a side of the bag body 21. I'm letting you. In the clip 10, the locking leg portion 12 as a mounting tool is passed through each mounting hole 54a, the locking leg portion 12 is locked to the peripheral edge of the mounting hole 54a, and the locking leg portion 12 is inserted into the mounting hole 2a of the inner panel 2. It is configured so that it can be temporarily fixed to the mounting piece 52 until it is mounted.

Then, the front mounting pieces 52A and 52B have the upper edge 21a of the non-arranged region 28 in which the recess 26 on the front side of the connection port 32 is not arranged, that is, the bag, in a state where the bag main body 21 is expanded flat. The base portion 53 is sewn onto the vehicle inner side I of the front side portion 21aa of the upper edge 21a of the main body 21, and the tip portion 54 side is directed upward.

Further, the rear mounting pieces 52C and 52D have an upper edge 21a of the recessed arrangement area 27 in which the recessed portion 26 including the arrangement position of the connection port portion 32 is arranged in a state where the bag main body 21 is spread flat, that is, The base portion 53 is sewn to the vehicle outer side O of the rear side portion 21ab of the upper edge 21a of the bag body 21. Further, in the case of the embodiment, the mounting pieces 52C and 52D arranged in these recessed arrangement regions 27 are oriented in the direction from the base portion 53 sewn to the rear side portion 21ab of the upper edge 21a toward the tip portion 54. It is sewn downward so as to be on the lower edge 21b side of the main body 21.

As will be described later, such sewing specifications are provided in the axial direction on the outer surface (outer peripheral surface) 59 of the folded body 58 when the substantially columnar folded body 58 formed by folding the airbag 20 is formed. Each mounting piece 52 (A, B, C, D) connects 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 is upward from the base portion 53. This is to align them so that they protrude.

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

Then, the airbag 20 is a folded body 58 in which the lower edge 21b of the bag body 21 in a state where the inner side wall portion 30a of the vehicle and the outer wall portion 30b of the vehicle are overlapped and unfolded flatly is folded so as to approach the upper edge 21a. , It is stored on the upper edge Wu side of the window W.

As shown in FIGS. 3A to 3C, the folded body 58 is arranged on the upper edge 21a side of the airbag 20 and is folded in order in the vertical direction while making a plurality of folds 62 and 64 along the front-rear direction. The bellows folding portion 60 provided with the plurality of overlapping folding portions 61 and 63 and the bellows folding portion 60 are arranged below the bellows folding portion 60 so that the lower edge 21b side of the airbag 20 approaches the upper edge 21a side of the airbag 20. It is composed of a roll folding portion 70 to be wound around, and is folded into a substantially columnar folding shape.

In the case of the embodiment, the roll folding portion 70 is formed by an outer roll folding in which the lower edge 21b side of the bag body 21 is wound on the side of the vehicle outer wall portion 30b. In the folding step of the folding 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. While attaching, the roll fold portion 70 is formed, then the take-up bar is removed, and the roll fold portion 70 is pressed against the upper edge 21a side to form the bellows fold portion 60 with folds 62 and 64, and the fold is formed. The tatami mat 58 is folded.

Further, the bellows folding portion 60 of the embodiment is folded downward from the upper edge 21a side of the bag body 21 through the first folding portion 61 and the vehicle inner fold 62 along the front-rear direction. After passing through the second folded portion 63 to be overlapped, a vehicle outer fold 64 is provided so as to be connected to the roll folded portion 70. Then, in the case of the embodiment, the fold 64 at the uppermost position of the recessed arrangement area 27 of the recessed portion 26 is the D.C. As shown in (b), a bellows fold is formed as a vehicle outer fold 64, and further, as a fold 64 arranged only once in the region of the rear side portion 41ab of the gas conductive portion 41 in the recessed arrangement region 27. A portion 60 is formed (see B in FIG. 2).

Further, in the folded substantially columnar folding body 58, the outside of the folding body 58 is aligned so that the mounting pieces 52 (A, B, C, D) are aligned along the axial FC of the folding body 58. The base portion 53 is coupled to the vehicle interior side surface 59a of the surface 59, and the tip portion 54 side is arranged upward (see FIGS. 3 to 6).

In such a specification, in the mounting pieces 52A and 52B provided in the non-arrangement area 28 which is not the arrangement area of the recess 26, the base portion 53 is coupled 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 54 side is projected upward. Then, in the bellows folding portion 60 provided above the roll folding portion 70, the mounting pieces 52 (A, B) are the first folding portions from the front side portion 21aa of the upper edge 21a in the bellows folding to the vehicle inner fold 62. A connecting portion 61a is provided on the surface side of the portion 61, that is, on the vehicle inner side surface 59a of the folded body 58, the original portion 53 is connected, 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 arrangement area 27, a connecting portion 63a is provided on the vehicle inner side surface 59a of the folded body 58 so that the base portion 53 is joined and the tip portion 54 side is extended upward. However, the recessed arrangement area 27 is a rear side portion 21ab in which the upper edge 21a side of the bag body 21 is lowered downward from the non-arrangement area 28 due to the recessed area 26. Therefore, even if the bellows folding portion 60 is provided with the first folding portion 61 and the second folding portion 63 which are sequentially folded with the folds 62 and 64, in the recessed arrangement area 27, the first folding portion 61 is provided by the recess 26. The region of the second fold portion 63 connected to the outer fold 64 of the first vehicle is the rear portion 21ab on the upper edge 21a side of the bag body 21. Further, the front surface side of the second fold portion 63 is a portion that overlaps with the first fold portion 61 on the lower side of the back side of the first fold portion 61, and when the bellows fold due to the expansion and expansion of the bag body 21 is eliminated, the front and back surfaces. And upside down. Therefore, the mounting pieces 52 (C, D) provided in the recessed arrangement area 28 are formed on the inside I of the vehicle to connect the mounting pieces 52 (A, B) to the flatly deployed upper edge rear portion 21ab of the bag body 21. As opposed to the surface, if it is connected downward to the surface O on the outside of the vehicle, in the state of the folded body 58, the inner surface 59a of the outer surface 59 (A, B) as well as the mounting pieces 52 (A, B) ( The base portion 53 is coupled to the coupling portion 63a) and arranged so as to extend the tip portion 54 side upward.

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

The airbag assembly 75 formed in this way is attached by inserting the locking leg 12 of each clip 10 into the mounting hole 2a at the corresponding inner panel 2, and a bracket (not shown) for holding the inflator 17 is attached. It is attached to a predetermined inner panel 2, and the attachment bracket 14 of the tension belt 55 is bolted to the inner panel 2 of the front pillar portion FP, and a lead wire (not shown) extending from the control device for operating the inflator is further attached. If the front pillar garnish 4 and roof head lining 5 are attached to the inner panel 2 on the body 1 side by connecting to the inflator 17, and the pillar garnishes 6 and 7 are attached to the inner panel 2 on the body 1 side, the head protection air is provided. 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 in response to an operation signal from the control device at the time of a side collision, an oblique collision, or a rollover of the vehicle V. Then, the expansion gas G (see FIG. 2) discharged from the inflator 17 flows into the bag body 21, and the expanding bag body 21 breaks the wrapping material 74, and further, the front pillar garnish 4 and the front pillar garnish 4. The airbag cover 9 composed of the lower edge of the roof head lining 5 is pushed open and protrudes downward, while the two-dot chain line in FIG. 1 and the windows W1, W2 and the center pillar portion are shown as shown in FIGS. The CP and the rear pillar portion RP will be greatly expanded so as to cover the inside I of the vehicle.

At that time, in the head protection airbag device M of the embodiment, the airbag 20 housed on the upper edge Wu side of the window W as the folded body 58 connects the expansion gas G from the inflator 17 from the connection port 32. At the time of inflow, the expansion gas G flows into the gas conductive portion 41 on the upper edge 21a side of the airbag 20, and the fold of the bellows folding portion 60 is canceled, and then the folding of the roll folding portion 70 is canceled, and the air is released. The bag 20 expands and expands from the upper edge 21a side to the lower edge 21b side so as to cover the inside I of the window W by eliminating folding. Then, when the folds 62 and 64 of the bellows fold are eliminated, the expansion gas G is applied to each of the folds 62 and 64 in the front-rear direction of the airbag 20 in the vicinity immediately before the folds 62 and 64, respectively. The expansion gas G accumulates, and the expansion gas G flows in the front-rear direction along the folds 62 and 64, overcomes the folds 62 and 64, and eliminates the folds (FIGS. 7B and 7). See B and C in 8). Therefore, in the gas conductive portion 41 in which the recess 26 is arranged, a fold 64 along the front-rear direction of the bellows fold is arranged together with another portion (a non-arranged region in which the recess 26 is not arranged) 28. For example, immediately before the fold of the fold 64 is unfolded, the expansion gas G is accumulated together with the other portion 28, and then, including the portion 27 in which the recess 26 is arranged, in the front-rear direction of the gas conductive portion 41. The entire area should be substantially equal over the fold 64 to eliminate the fold, and then the fold of the roll fold portion 70 below the fold 64 should be resolved approximately equally over the entire area in the front-rear direction of the airbag 20. As a result, with respect to the behavior of the expansion and expansion of the airbag 20, the roll folds are eliminated almost equally over the entire area of the airbag 20 in the front-rear direction up to the lower edge 21b side, and good deployment performance is achieved. Can be secured.

Therefore, in the head protection airbag device M of the embodiment, even if the recess 26 recessed downward is provided on the upper edge 21a side of the airbag 20, the deployment performance of the airbag 20 at the time of expansion and expansion is improved. be able to.

Then, in the head protection airbag device M of the embodiment, the airbag 20 is formed by bag weaving, and the concave-convex shape on the upper edge 21a side including the connection port portion 32 is point-symmetrically mutually symmetrical. The shape is such that it fits substantially.

Therefore, in the embodiment, as shown in FIG. 9, a large number of bag-woven fabrics (base fabric materials for bags) 80 when forming the airbag 20 can be taken as the arrangement of the airbags 20 before cutting. 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 side of the two airbags 20 are aligned with each other along the width direction DW of the fabric 80 and the connection port. The portion 32 side can be shifted in the longitudinal direction DL of the fabric 80 and arranged close to each other. At that time, the airbag 20 has a shape in which the concave-convex shape (shape in which the concave portion 26 and the convex portion 29a are provided) 29 on the upper edge 21a side including the connection port portion 32 is point-symmetrically and substantially fitted to each other. When the airbags 20 are lined up point-symmetrically in the width direction DW of the fabric 80, the connection ports 32 overlap each other along the longitudinal direction DL of the fabric 80, so that the two airbags 20 are separated from each other. A residual material 81 that can be placed close to the rectangular region BG in a state in which the substantially linear lower edges 21b sides are substantially parallel to each other and is disposed of wastefully. The airbag 20 (bag body 21) can be cut from the bag-woven fabric 80, and the airbag 20 formed by the bag-weaving can be manufactured with good yield.

Of course, even in an airbag made of a sewing bag formed by stacking two base cloth materials for a bag and suturing the outer peripheral edges with each other, the concave-convex shape (with the recess 26) on the upper edge 21a side including the connection port 32. 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. Further, even in the case of a sewing bag, if the gas conduction portion of the recessed arrangement region is provided with a bellows-folded fold, the deployment performance of the recessed portion can be improved even if the recess is provided.

Further, in the head protection airbag device M of the embodiment, the airbag 20 includes a bag main body 21 and mounting pieces 52 (A, B, C, D). The mounting pieces 52 (A, B, C, D) have a recessed arrangement area 27 and a recessed portion in which the recessed portion 26 of the bag body 21 is arranged in order to mount the bag body 21 on the body 1 side on the upper edge Wu side of the window W. A plurality of 26s are arranged along the front-rear direction on the upper edge 21a side of the non-arranged region 28 on which the 26 is not arranged, and the base 53 side is on the upper edge 21a (21aa, 21ab) side of the bag body 21. A mounting hole 54a is provided on the tip end portion 54 side through which the mounting tool 12 to be fastened to the body 1 side is penetrated. Further, the folding body 58 is configured to be folded into a substantially columnar shape, and the mounting pieces 52 (C, D) coupled to the concave arrangement region 27 and the mounting pieces 52 (A, D) coupled to the non-arrangement region 28. The base 53 side with B) is joined to the same surface 59a side of the folding body 58 on the outer surface 59 along the axial FC, and the tip of each mounting piece 52 (A, B, C, D) is connected. 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 connected to the upper edge 21a side of the bag body 21 extending over the recessed arrangement area 27 and the non-arrangement area 28, the folded body 58 has each attachment. The pieces 52 (A, B, C, D) connect the base portion 53 to the same surface 59a side along the axial FC on the outer surface 59 of the folded body 58, and the tip portion 54 side protrudes upward. As a specification to be made, the protruding form of each mounting piece 52 (A, B, C, D) is equivalent. Therefore, in such a configuration, the tips of the mounting pieces 52 (C, D) and 52 (A, B) of the recessed region 27 and the non-concave region 28 are simply and equally equivalent without any difference. The folded body 58 can be attached to the body 1 side without causing twisting only by fastening the portion 54 to the body 1 side using the attachment 12.

In particular, in the case of the embodiment, the bellows folding portion 60 of the folded body 58 is formed by providing a plurality of folding portions 61, 63 that are folded in order from the upper edge 21a side of the bag body 21, and is provided in the non-arrangement region 28. The pieces 52 (A, B) connect the base portion 53 to the first folded portion 61 on the upper end side, and the mounting pieces 52 (C, D) provided in the recessed arrangement area 27 are even-numbered (implemented) to be folded. In the form, the original portion 53 is coupled to the folded portion 63 of the second). Then, the mounting pieces 52 (A, B) arranged in the non-arrangement region 28 are on the tip 54 side with respect to the vehicle inner side I on the upper edge 21a (front side portion 21aa) side of the flatly deployed bag body 21. The mounting pieces 52 (C, D) attached to the recessed arrangement area 27 are configured to connect the base portion 53 upward, and the upper edge 21a (rear side portion 21ab) of the bag body 21 developed flatly. On the side, the base portion 53 is coupled to the vehicle outer side O opposite to the mounting piece 52 (A, B) disposed in the non-arrangement region 28 with the tip portion 54 side facing downward. ing.

Therefore, in the embodiment, the mounting pieces 52 (C, D) of the recessed arrangement region 27 are connected to the even-numbered (second) folded portion 63, and the connecting portion 63a expands and expands the bag body 21. When the bellows fold is resolved, it is arranged on the outside O of the vehicle on the opposite side of the first fold portion 61. Therefore, in the mounting pieces 52 (C, D) of the recessed arrangement area 27, if the tip 54 side is arranged downward on the flatly expanded bag body 21, the folded body 58 is formed into a substantially columnar shape. Similar to the mounting pieces 52 (A, B) of the non-arrangement region 28, the tip portion 54 can be arranged so as to face upward from the base portion 53.

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

Therefore, in the embodiment, the roll folding portion 70 is an outer roll folding, and when the folding is unfolded, 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 base portion 53 of the mounting piece 52 (C, D) provided in the recessed arrangement region 27 is coupled to the even-numbered folded portion 63 of the folded portion of the bellows folding portion 60. However, as in the airbag 20A shown in FIGS. 10 and 11, the bellows folding portion 60A of the folding body 58A is coupled to the odd-numbered (third in the case of the figure) folding portion 65. In the case, the original portion 53 is coupled to the vehicle inner side I on the upper edge 21a (rear side portion 21ab) side and the tip portion is connected to the mounting piece 52 (A, B) to be coupled to the first folding portion 61. The 54 may be arranged upward.

That is, in this folding body 58A, assuming that the bag body 21 is the same as that of the embodiment, the bellows folding portion 60A arranges the first folding portion 61 from the upper end side, and the first folding portion 61 to the first vehicle inner fold. The second fold portion 63 is arranged through 62, the third fold portion 65 is arranged from the second fold portion 63 through the first vehicle outer fold 64, and the third fold portion 65 to the second vehicle inner fold. The fourth fold portion 67 is arranged through 66, and is connected to the roll fold portion 70 from the fourth fold portion 67 through the second vehicle outer fold 68.

The gas conductive portion 41 of the recessed arrangement region 27 is provided with two folds 66, 68, that is, a second vehicle inner fold 66 and a second vehicle outer fold 68.

In such a folded body 58A of the airbag 20A, the mounting pieces 52 (A, B) provided in the non-arrangement region 28 are located inside the vehicle I of the upper edge 21a (front side portion 21aa) of the bag body 21 (bellows folding portion). In 60A, the surface of the first folding portion 61) and the connecting portion 61a are provided, the base portion 53 is joined, the tip portion 54 side is arranged upward, and the mounting piece 52 provided in the recessed arrangement region 27. (C, D) is provided with a joint portion 65a on the inside I of the upper edge 21a (rear side portion 21ab) of the bag body 21 (the surface of the third folding portion 65 in the bellows folding portion 60A), and the base portion 53. The mounting pieces 52 (A, B, C, D) are projected onto the vehicle interior side surface 59a of the outer surface 59 of the folding body 58A even if the tip 54 side is arranged upward. , The tip portion 54 side can be oriented upward and aligned. That is, the connecting portion 65a to which the mounting pieces 52 (C, D) provided in the recessed arrangement region 27 are connected is provided on the surface side of the odd-numbered third folding portion 65, and the surface side of the folding portion 65 is the first. This is because it is arranged inside the vehicle I in the same manner as the one-fold portion 61.

Of course, even with this airbag 20A, the folding body 58A can align the protruding specifications of the mounting pieces 52 (A, B, C, D) with the tip 54 side facing upward, thus preventing the occurrence of twisting. Therefore, it can be easily attached to the vehicle. Further, two folds 66 and 68 are arranged in the concave arrangement area 27, and the deployment performance of the concave arrangement area 28 can be improved as in the non-arrangement area 27.

Further, in the embodiment, the recess 26 provided on the upper edge 21a side of the airbag 20 is set including the arrangement area of the connection port 32, but as in the bag body 21B of the airbag 20B shown in FIG. The connection port portion 32 may be arranged in the non-arrangement region 28 in which the recess 26 is not arranged. In this airbag 20B, as the folds for bellows folding, the first and second car inner folds 62 and 66 and the first and second car outer folds 64 and 68 are formed as the airbag 20A in FIGS. Just by providing it, a folded body will be formed in the same folding process.

1 ... Body, 10 ... Clip, 11 ... Presser plate part, 12 ... (Attachment) Locking leg part ,, 17 ... Inflator, 20, 20A, 20B ... Airbag, 20a ... Upper part, 21,21B ... Bag body, 21a ... Upper edge, 21aa ... Front side part, 21ab ... Rear part, 21b ... Lower edge, 26, 26B ... Recessed, 27 ... Recessed placement area, 28 ... Non-placement area, 29 ... Concavo-convex shape, 29a ... Convex part, 30 ... gas inflow portion, 30a ... vehicle inner side wall portion, 30b ... vehicle outer 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 ... Original part, 54 ... Tip part , 54a ... Mounting holes, 58, 58A ... Folded body, 59 ... Outer surface, 59a ... Car interior side surface, 60, 60A ... Bellows folding part, 61 ... First folding part, 61a ... (Mounting pieces 52A, 52B) Part, 62 ... (1st) car inner fold, 63 ... 2nd fold, 63a ... (mounting pieces 52C, 52D) joint, 64 ... (1st) car outer fold, 65 ... 3rd fold , 65a ... (mounting pieces 52C, 52D) joint, 66 ... (second) car inner fold, 67 ... fourth fold, 68 ... (second) car outer fold, 70 ... roll fold,
V ... Vehicle, W (W1, W2) ... Window, Wu ... Upper edge, I ... Inside the car, O ... Outside the car, FC ... (Folded body) axial direction, G ... Expansion gas, M ... Head protection Airbag device.

Claims (5)

An airbag that is folded and stored along the front-rear direction on the upper edge side of the window inside the vehicle, and expands and expands downward so as to cover the inside of the window when expansion gas flows in from the inflator. Prepare,
The airbag
A cylindrical connection port arranged on the upper edge side and connected to the inflator, and
A protective expansion unit for occupant protection, which is expanded by inflowing expansion gas from the connection port and is arranged side by side in the front-rear direction,
With
Each of the protective expansion parts
An initial expansion part that is placed on the upper side and expands by inflowing expansion gas,
A main body expansion portion arranged below the initial expansion portion,
With
The airbag
The initial expansion portion of each protection expansion portion is arranged as a gas conduction portion that communicates with the connection port portion in the front-rear direction.
A head protection airbag device configured to be housed on the upper edge side of the window as a folded body folded so that the lower edge side approaches the upper edge side in a flatly unfolded state.
The airbag is provided with a recess, which is recessed downward from the upper edge side portion of another portion, at the upper edge side portion of the gas conduction portion.
The folded body
A bellows fold portion that is arranged on the upper edge side of the airbag, has creases along the front-rear direction, and is folded in the vertical direction.
A roll fold portion that is arranged below the bellows fold portion and that winds the lower edge side of the airbag so as to approach the upper edge side of the airbag.
As well as being configured with
The head protection air is configured by arranging at least one crease along the front-rear direction of the bellows fold portion in the region of the gas conductive portion in which the recess is arranged. Bag device. The first aspect of the present invention is characterized in that the airbag is formed by bag weaving, and the concave-convex shape on the upper edge side including the connection port portion is point-symmetrically and substantially fitted to each other. The head protection airbag device described. The airbag
With the bag body
In order to attach the bag body to the body side on the upper edge side of the window, in the front-rear direction on the upper edge side of the recess arrangement area in which the recess is arranged and the non-arrangement area in which the recess is not arranged. A plurality of mounting pieces are arranged along the line, and a mounting piece having a base side connected to the upper edge side of the bag body and a mounting hole provided on the tip side for passing a mounting tool to be fastened to the body side.
With
The folded body
In addition to being configured to be folded into a substantially columnar shape,
The base side of the mounting piece coupled to the recessed placement region and the mounting piece coupled to the non-placement region is coupled to the same surface side of the outer peripheral surface along the axial direction of the folded body. The head protection airbag according to claim 1 or 2, wherein the mounting pieces are arranged so that the tip portion of each mounting piece protrudes upward. Device. The bellows-folded portion of the folded body is formed by providing a plurality of folded portions that are folded in order from the upper edge side of the bag body.
The mounting piece provided in the non-arrangement region connects the base portion to the first folding portion on the upper end side, and the mounting piece provided in the recessed arrangement region is formed in the even-numbered folded portion to be folded. , The base parts are joined and arranged,
The mounting piece disposed in the non-arranged region has the front end side facing upward with respect to one side of the vehicle inside or the vehicle outside on the upper edge side of the bag body that is spread flat. Combine,
The mounting piece attached to the recessed area is on the upper edge side of the bag body that is spread flat, with respect to the other side of the vehicle outside or the inside of the vehicle opposite to the mounting piece arranged in the non-arrangement area. The head protection airbag device according to claim 3, wherein the base portion is connected with the tip end portion facing downward. Any one of claims 1 to 4, wherein the roll folding portion of the folded body is formed by an outer roll folding portion in which the lower edge side of the bag body is wound on the side of the outer wall portion of the vehicle. Head protection airbag device as described in the section.

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