JP3398816B2 - Airbag for head protection airbag device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag of a head protection air bag device mounted on an automobile, and more specifically, is folded and accommodated in a peripheral edge of an opening on the inside of the vehicle and is opened when an inflation gas flows in. The present invention relates to an airbag of a head protection airbag device that inflates so as to cover the airbag.

[0002]

2. Description of the Related Art Conventionally, an airbag for a head protection airbag device of this type has been disclosed in International Patent Publication W096 /
As described in 26087 and British Patent Application Publication No. 2314300, a bag-like member that communicates with a gas inflow portion for inflow of an inflation gas and the gas inflow portion and expands so as to cover an opening inside the vehicle. And an inflating body portion of.

When inflated, the bag-shaped inflating main body has a structure in which a plurality of non-inflatable portions in the vertical direction are arranged side by side in the horizontal direction, and expansion chambers extending in the vertical direction are arranged in the horizontal direction.
Further, the gas inflow portion is arranged from the front end side to the upper edge side of the expansion main body portion, and is formed to extend in the front-rear direction so as to communicate with each expansion chamber.

In such a structure, the expansion gas flows downward into each expansion chamber via the gas inflow portion,
Since the gas inlet is located at the periphery of the opening, it takes time for each expansion chamber to expand to some extent, and there is room for improvement in that a large area that can restrain the occupant before the completion of expansion is quickly provided. there were.

The present invention solves the above-mentioned problems, and provides an airbag for a head protection airbag device in which an area for restraining an occupant can be quickly and widely arranged before completion of inflation. With the goal.

[0006]

SUMMARY OF THE INVENTION An airbag according to the present invention comprises a bag-shaped inflating main body which is inflated so as to cover an opening on the inside of a vehicle, and is arranged at one end side in the front-rear direction of the inflating main body. A gas inflow part for inflowing an inflating gas into an inflating body part, and an airbag for a head protection airbag device, which is folded and housed in the opening peripheral edge of a vehicle inside, The main expansion chamber is arranged such that the main expansion chamber is arranged so as to extend in a substantially straight line from the gas inflow portion in the front-rear direction, and the main expansion chamber is connected to the end side of the main expansion chamber remote from the gas inflow portion. Above and below the expansion chamber
A lower sub-inflation chamber, and the airbag,
It is formed by double weaving with a warp and a weft, the main expansion chamber is arranged substantially parallel to the warp or the weft, and is folded at a fold line along the main expansion chamber. To do.

Further, it is desirable that 50% or more of the total length of the upper edge and the lower edge of the main expansion chamber is formed in parallel with the warp or weft.

[0008]

In the airbag of the head protecting airbag apparatus according to the present invention, when the inflation gas flows in, the inflation gas flows into the main inflation chamber of the inflation main body through the gas inflow portion, and further, The expansion gas will flow from the expansion chamber to the upper and lower auxiliary expansion chambers.

That is, the main inflation chamber is inflated before the inflation gas is introduced into the upper and lower auxiliary inflation chambers to complete the inflation of the airbag, and the main inflation chamber is substantially straight from the gas inflow portion. Since it is arranged so as to extend in the front-rear direction, it expands quickly, and in the front-rear direction at the vertical middle portion of the upper and lower sub-expansion chambers, that is, in the vertical middle portion of the expansion body. Since it is arranged for a long time, it expands in a large area.

Therefore, the airbag of the head protecting airbag apparatus according to the present invention can quickly and inflat the main inflation chamber in a large area before the completion of inflation, and the area of the main inflation chamber allows the inflation. The passenger can be restrained quickly and in a large area before the completion.

Further, in the airbag according to the present invention, the airbag is formed by the hollow weave of the warp yarn and the weft yarn, so that the airbag can be easily manufactured without sewing or adhering the peripheral edge.

Further, the main inflating portion is arranged substantially in parallel with the warp or weft, and the airbag is folded at the fold line along the main inflating chamber. Obtainable.

That is, when the main expansion chamber expands, a large tensile force acts on the upper edge and the lower edge of the peripheral edge of the main expansion chamber, which are the boundary portions with the non-expansion part that does not expand. But,
Since the main expansion chamber is substantially parallel to the warp or weft, and the mesh of the weave structure at the upper and lower edges of the main expansion chamber does not spread easily (since misalignment does not easily occur), the upper edge of the main expansion chamber It is possible to prevent the inflation gas from leaking from the bottom edge.

Further, the high-pressure inflation gas at the beginning of flowing into the main expansion chamber is arranged so that the main expansion chamber extends in a substantially straight line from the gas inflow portion in the front-rear direction. Along a straight line toward the end side away from the gas inflow portion. Since the folds are formed along the main expansion chamber extending in the front-rear direction, the high-pressure inflation gas that flows linearly toward the end side away from the gas inflow portion intersects the folds at right angles. So do not clash. Therefore, the inflation gas is
Rather than canceling the fold, go to the end side away from the gas inflow part, suppress the partial high pressure applied to the fold portion, and prevent the weaving mesh of the fold portion from expanding. be able to.

On the other hand, if the folds are arranged so as to intersect with the main expansion chamber arranged so as to extend in the front-rear direction, the folds for expansion at high pressure at the beginning of inflow into the main expansion chamber will be used. The gas advances linearly toward the end side away from the gas inflow part,
It hits the fold part that intersects with the main expansion chamber, and the fold part will be overcome by linearly crossing over the fold part.
At the time of canceling the fold, a high pressure is partially applied to the fold portion intersecting with the main expansion chamber, and the mesh of the woven structure at the fold portion is expanded, so that the expansion gas does not leak. I will invite you.

Therefore, in the airbag according to the present invention, it is possible to suppress the leakage of the inflation gas.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. An airbag 20 according to the embodiment shown in FIGS. 1 to 4 has an upper edge side of an opening W of a door or a window inside a vehicle. Front pillar PF and roof side rail R in
To the head protection airbag device M that is installed over
Is what is used.

The head protection airbag device M includes an airbag 20, an inflator 18, and a mounting bracket 15.
And an airbag cover 11 are provided.

The inflator 18 is of a cylinder type for supplying inflation gas to the folded airbag 20, and the gas inflow portion 23, which will be described later, of the airbag 20 is exteriorly mounted.

The mounting bracket 15 is made of sheet metal, and holds the inflator 18, which covers the gas inflow portion 23 of the airbag 20, from the outer peripheral side together with the gas inflow portion 23.
It will be attached to the side panel 2 using the bolt 16 of the book.

The airbag cover 11 is composed of a pillar garnish 12 arranged in the front pillar portion PF and a roof interior material 13 arranged in the roof side rail portion R. As shown in FIGS. 1 and 2, the pillar garnish 12 is made of synthetic resin and is fixedly attached to the inner panel 7 of the front pillar main body 4 by an attachment means (not shown) so that the airbag 20 is projected when the airbag 20 is inflated. The door portion 12a is configured to be pushed and opened as much as possible. As shown in FIGS. 1 and 3, the roof interior material 13 is also made of synthetic resin and fixed to the roof side rail main body 9 made of sheet metal by a mounting means (not shown). The roof interior material 13 also allows the airbag 20 to project when the airbag 20 is inflated.
3a is configured to be pushed and opened. The front pillar body 4 is composed of a sheet metal lean force panel 5, an outer panel 6, and an inner panel 7, each of which includes a roof side rail body 9 and a side panel 2.
Together with this, the body 1 is configured.

As shown in FIGS. 4 to 7, the airbag 20 has a flexible bag-like shape and is made of polyamide yarn or the like for the warp V and the weft H (encircled in FIG. See an enlarged part of FIG. 2) An airbag body 21 formed by bag-weaving, and a belt portion 35 sewn to the rear edge 30a of the airbag body 21 and made of a woven fabric using a polyamide thread or the like. Has been done.

The airbag body 21 is an inflator 1.
The inflating gas from 8 is introduced and expanded from the folded state, and the vehicle inner side / outer side wall portions 21a and 21b (see FIG. 7).
An inflating portion 22 that expands so as to separate from each other and increase in thickness,
It is composed of a non-expandable portion 29 whose thickness does not increase.
In addition, the airbag body 21 is woven into a bag, and each part 2
After forming 9, the surface may be coated with silicon or the like in order to improve heat resistance and sealing properties.

The inflating section 22 communicates with the gas inflow section 23 for inflowing the inflating gas arranged on the front end side and extends to the rear side in communication with the gas inflow section 23 and expands so as to cover the opening W on the inside of the vehicle. And a bag-shaped expansion main body 24.

The gas inflow portion 23 has a cylindrical shape extending in the front-rear direction and has an opening at the front end side. The inflator 18 is inserted from the front end side, and the mounting bracket 15
By being tightened on the inflator 18 side, it will be connected to the inflator 18. In addition, in order to secure heat resistance on the inner peripheral surface side of the gas inflow portion 23,
Alternatively, an inner tube made of the same material as the airbag body 21 itself may be fixed.

The inflating body portion 24 is arranged so as to linearly extend rearward from the gas inflow portion 23, and is arranged substantially parallel to the weft H of the weave structure of the airbag body 21. 25, and upper and lower sub-expansion chambers 26 and 27, which communicate with the rear end 25a side of the main expansion chamber 25 and are arranged above and below the main expansion chamber 25, respectively.

The non-inflatable portion 29 is formed by weaving so that the vehicle interior side wall portion 21a and the vehicle exterior side wall portion 21b of the airbag body 21 are joined together, and the gas inflow portion 23 and the inflation body portion 2 are formed.
4, the outer peripheral edge of the outer peripheral edge portion 4 of the expansion main body 2 is tightly woven so as to ensure airtightness, and the expansion main body portion 2
Upper and lower restricting portions 31 and 32 extending rearward in the region of 4,
It is configured with. The upper restricting portion 31 includes a lower first restricting portion 31a and a second restricting portion 31d disposed above the first restricting portion 31a and in parallel with the first restricting portion 31a. The second restriction portion 31d includes the upper auxiliary expansion chamber 26.
Plays a role in controlling the thickness when expanded.

Then, the first restricting portion 31a of the upper restricting portion 31.
And the lower regulation part 32 are the upper and lower edges 25b of the main expansion chamber 25.
25c is defined. Then, in the first restricting portion 31a of the upper restricting portion 31, the upper edge 25b of the main expansion chamber 25 defined by the lower edge 31c of the first restricting portion 31a extends over the entire length, and the weft yarn H in the woven structure of the airbag main body 21. Although it is arranged along the front-rear direction so as to be parallel to, and the lower regulation portion 32 has a step near the middle in the front-rear direction on the upper edge 32b side, it gradually descends downward,
The lower edge 25c of the main inflating portion 25b regulated by the upper edge 32b of the lower regulating portion 32 is arranged in the front-rear direction so as to be substantially parallel to the weft H in the weaving structure of the airbag body 21 over the entire length. Has been done. In the case of the embodiment, the length Ld · L along the main inflating portion 25 of the inclined non-parallel portions 25d / 25e at the lower edge 25c of the main inflating portion 25.
The total of e is 9% of the total of the lengths Lb and Lc along the main expansion portion 25 at the upper edge 25b and the lower edge 25c of the main expansion chamber 25.
As a result, 91% of the total length of the upper edge 25b and the lower edge 25c of the main expansion chamber 25 is formed in parallel with the weft H of the weave structure (see FIG. 5).

As shown in FIG. 4, the rear ends 31b and 32a of the first restricting portion 31a and the lower restricting portion 32 intersect the rear edge 30a of the peripheral edge portion 30 which is arranged substantially vertically. And is provided with a gap between the trailing edge 30a and the trailing edge 30a.
Inlets 26a of the upper and lower auxiliary expansion chambers 26 and 27 through which the air flows
-It will constitute 27a.

Further, on the upper edge 30b side of the peripheral edge portion 30,
A plurality of mounting portions 33 are formed. Each of the mounting portions 33 has a mounting hole 33a at the center thereof, into which the mounting bolt 41 is inserted. Further, on both sides of the mounting hole 33 of each mounting portion 33, through holes 33b are formed which are opened in a rectangular shape and through which respective locking legs 39b of a mounting bracket 37 described later are inserted. These holes 33
The a and 33b are formed by punching after bag-weaving. As shown in FIGS. 1 to 3, a mounting bracket 37 made of sheet metal for mounting the folded airbag 20 to the inner panel 7 of the body 1 or the roof side rail body 9 is attached to each of the mounting portions 33. It will be fixed.

Each mounting bracket 37 is shown in FIGS.
As shown in FIG. 11, the inner plate portion 38 on the inner side of the vehicle and the outer plate portion 3 on the outer side of the vehicle are made of sheet metal, with the mounting portion 33 interposed therebetween.
9 is provided. These inner and outer plate portions 38 and 39 are connected to each other at two locations on the upper edge side in a belt-like connecting portion 40.
Are interconnected by. Inner / Outer plate part 3
As shown in FIGS. 8 and 9, mounting holes 38a and 39a into which the mounting bolts 41 are inserted are formed in the center of 8 and 39, respectively. Further, as shown in FIGS. 8 and 11, locking holes 38b formed in a substantially rectangular shape are formed on both left and right sides of the mounting hole 38a of the inner plate portion 38, and the locking holes 38b are formed at inner peripheral edges thereof. A triangular plate-shaped protrusion 38c is formed. further,
As shown in FIGS. 8 and 10, a hook-shaped locking piece 38d protruding outward from the vehicle is formed on the end side of the inner plate portion 38. The locking piece 38d is locked to the periphery of a locking hole (not shown) provided in the inner panel 7 or the roof side rail body 9 to prevent the mounting bracket 37 from falling, and the mounting bracket 37 is secured to the inner panel 7 or the inner panel 7. This is for preventing the mounting bracket 37 from rotating when the bolt 41 is fixed to the roof side rail body 9. On the other hand, on the left and right sides of the mounting hole 39a of the outer plate portion 39, as shown in FIG.
As shown in FIG. 11, the locking leg 39b is formed so as to project and fold back inside the vehicle. These locking legs 39b are
The inner plate portion 38 is locked to the projecting piece 38c at the inner peripheral edge of each locking hole 38b.

The mounting brackets 37 are fixed to the respective mounting portions 33 by opening the inner and outer plate portions 3 apart from each other.
The inner and outer plate portions 38 and 39 are closed by interposing the respective mounting portions 33 between the inner plates 8 and 39, and the respective locking legs 39b of the outer plate portion 39 are passed through the through holes 33b of the mounting portion 33 and then the inner plate. This is done by locking the protrusion 38c of the portion 38 (see FIG. 11). Then, the locking pieces 38d are locked to the peripheral edges of the locking holes of the inner panel 7 and the roof side rail body 9 (not shown), and the mounting bolts 41 are fixed to the mounting holes 38a, 33a, 39a as shown in FIGS. The folded airbag 20 is attached to the body 1 by being inserted into the inner panel 7 and screwed into the nuts 7b and 9b fixed to the peripheral edges of the mounting holes 7a and 9a of the main body 9 of the roof side rail. Becomes

In the case of the embodiment, the belt portion 35 has a three-pronged shape with attachment piece portions 35a, 35b, 35c, and the end portions of the attachment piece portions 35a, 35b are sewn up and down at the rear edge 30a of the airbag body 21. It is worn. Mounting piece 35
A mounting hole 35d is formed at the tip of c, and a mounting bracket 37 is mounted after the airbag 20 is folded. Then, the mounting piece portion 35c is fixed to the roof side rail main body 9 with the bolts 41 similarly to the mounting portion 33.

The belt portion 35 is set to a predetermined length so that rearward tension acts on the lower edge 30c of the airbag body 21 when the airbag 20 is inflated after being mounted on the vehicle. There is.

When the airbag 20 is folded, as shown in FIG. 5, a fold line C is formed along the main inflation chamber 25, and the airbag 20 is bellows-folded from the lower edge side to the upper edge side in the expanded state. . Further, after folding, a rupturable tape material is wound at predetermined intervals so as not to collapse.

After the folding, the attachment piece 35c of the belt portion 35 is pulled out, and the attachment portion 33 on the front side is pulled out to attach the attachment brackets 37 to all the attachment portions 33 and the attachment piece portions 35c. After mounting, the gas inflow portion 23 is pulled out, the inflator 18 is inserted into the gas inflow portion 23, and the mounting bracket 15 is attached to the outer periphery of the gas inflow portion 23 to form the airbag assembly.

Then, the locking piece 3 of each mounting bracket 37
8d is locked to the peripheral edge of a locking hole (not shown) of the inner panel 7 or the roof side rail main body 9, and the mounting bracket 15
The bolt 1 at a predetermined position on the side panel 2 and
6 and the mounting brackets 37 are fixed to the inner panel 7 and the roof side rail body 9 with bolts 41. Further, if the pillar garnish 12 and the roof interior material 13 are attached to the body 1, the head protection airbag device M can be attached to the vehicle. When the airbag 20 is attached to the vehicle, the gas inflow portion 23
Is slightly bent so that the front edge 30bF side of the upper edge 30b of the peripheral edge portion 30 disposed in the front pillar portion PF is linearly continuous, and the front end side is lowered (FIG. 1 6).

When the inflator 18 is actuated after mounting on the vehicle, the inflation gas from the inflator 18 becomes
The airbag 20 is supplied to the inflating main body 24 via the gas inflow portion 23, so that the airbag 20 breaks the tape material (not shown) wound around the airbag body 20 and pushes the pillar garnish 12 and the roof interior material 13 so that the respective doors are opened. Part 1
2a and 13a are opened, and as shown by the two-dot chain line in FIGS.

In the airbag 20 of the embodiment,
At the beginning of the inflow of the expansion gas G, as shown in FIGS. 4 and 6, the expansion gas G first flows into the main expansion chamber 25 of the expansion main body 24 via the gas inflow portion 23, and further, the main expansion chamber 25. From the rear end 25a of 25 through the inlets 26a and 27a,
It will flow into the upper and lower expansion chambers 26 and 27.

That is, the main inflation chamber 25 is inflated before the inflation gas G flows into the upper and lower inflation chambers 26 and 27 to complete the inflation of the airbag 20, and the main inflation chamber 25 is Since it linearly extends rearward from the gas inflow portion 23, it quickly expands, and the upper and lower auxiliary expansion chambers 2
Since it is arranged long in the front-rear direction at the intermediate portion in the vertical direction of 6 · 27, that is, the intermediate portion in the vertical direction of the expansion main body 24, it expands in a wide area.

Therefore, the airbag 20 of the embodiment.
Before the expansion is completed, the main expansion chamber 25
Can be inflated, and the area of the main expansion chamber 25 enables the occupant to be quickly and accurately restrained in a wide area before the completion of inflation.

When the airbag 20 is inflated, as shown in FIG. 6, the belt portion 35 on the rear side pulls the lower edge 30c side of the airbag body 21 rearward.

Further, in the airbag 20 of the embodiment, the airbag main body 21 is formed by the hollow weaving of the warp V and the weft, and the peripheral edge thereof is not sewn or adhered.
The airbag 20 can be easily manufactured.

Furthermore, in the airbag 20 of the embodiment,
When the main expansion chamber 25 swells, a large tensile force is applied to the upper edge 25b and the lower edge 25c, which are the boundary portions between the non-expansion portion 29 (the first restriction portion 31a and the lower restriction portion 32) at the peripheral edge of the main expansion chamber 25. To work. However, since the main expansion chamber 25 is substantially parallel to the weft H of the weave structure, the upper edge 25 of the main expansion chamber 25 is
Since the mesh of the weave structure in b and the lower edge 25c is difficult to spread (since misalignment is unlikely to occur), it is possible to suppress the expansion gas G from leaking from the upper edge 25b and the lower edge 25c of the main expansion chamber 25. it can.

Further, the high-pressure expansion gas G initially flowing into the main expansion chamber 25 is arranged so that the main expansion chamber 25 extends rearward from the gas inflow portion 23 in a substantially linear manner. It flows linearly along the main expansion chamber 25 toward the rear end 25a side away from the gas inflow portion 23. Since the fold C is formed along the main expansion chamber 25 extending in the front-rear direction, the high-pressure expansion gas G that flows linearly toward the rear end 25a side away from the gas inflow portion 23 is mainly Folds C1, C2, C3, C4, C5, C6 arranged in the area of the expansion chamber 25
-C7 and C8 do not collide so as to intersect each fold portion 25f at right angles, and rather than cancel the fold, proceed to the rear end 25a side away from the gas inflow portion. Therefore, the expansion gas G is
Each fold C1, C2, C3, C4, C5, C6, C7, C
No high pressure is applied locally to the eight folds 25f, and pressure is applied to the entire long area in the front-rear direction of each fold 25f to cancel the folds. It is possible to suppress gas leakage from each fold portion 25f without expanding the mesh (see FIG. 5).

Therefore, in the airbag 20 of the embodiment, the leak of the inflation gas G can be suppressed, and the time until the completion of inflation can be shortened.

In the airbag 20 of the embodiment, 91% of the total length of the upper edge 25b and the lower edge 25c of the main inflation chamber 25 is used.
Are formed in parallel with the weft yarn H, and serve as a boundary portion with the non-expansion portion 29 in the main expansion chamber 25.
It is possible to reliably prevent the gas from leaking, and it is possible to accurately suppress the leak of the inflation gas G.

Furthermore, in the airbag 20 of the embodiment,
As shown in FIG. 4, the first and lower restricting portions 31a and 32 are arranged in a direction substantially orthogonal to the trailing edge 30a of the peripheral edge portion 30 which is arranged substantially vertically, and the rear end of the main expansion chamber 25 is arranged. A rear edge 30a of the non-expansion portion 29 that extends in the substantially vertical direction across the upper and lower auxiliary expansion chambers 26 and 27 is disposed on the side of 25a. Further, at the rear end 25a side of the main expansion chamber 25, the inlets 26a and 27a of the upper and lower auxiliary expansion chambers 26 and 27 are provided.
Are arranged to face each other vertically. Therefore, at the beginning of the inflow of the expansion gas G, the expansion gas G passing through the main expansion chamber 25 is
The upper and lower auxiliary expansion chambers 26 and 27 are smoothly separated by being guided by the trailing edge 30a that extends in the substantially vertical direction, and are separated into the upper and lower auxiliary expansion chambers 26 and 27 through the respective inlets 26a and 27a. 26 and 27 can be expanded smoothly.

In the airbag 20 of the embodiment, the upper edge 25b of the main expansion chamber 25 is parallel to the weft H of the weave structure, and the lower edge 25c of the main expansion chamber 25 is provided with a slight step so that the weave structure The case where the weft yarn H is substantially parallel to the weft yarn is shown. However, the main expansion chamber 25 may be set substantially parallel to the warp V of the woven structure depending on the method of cutting the bag-woven fabric.

Further, in the airbag 20 of the embodiment, the upper edge 25b of the main inflation chamber 25 is completely parallel to the weft H of the weave structure, and the lower edge 25c of the main inflation chamber 25 is provided with a slight step. It is substantially parallel to the weft H of the weave design, and the total length of the upper edge 25b and the lower edge 25c of the main expansion chamber 25 is 9
The case where 1% was made parallel to the weft H of the woven structure was shown.
However, 50% or more of the total length of the upper edge 25b and the lower edge 25c of the main expansion chamber 25 may be formed parallel to the warp V or the weft H of the weave design. This is because the upper edge 2 which is a boundary portion with the non-expansion portion 29 in the main expansion chamber 25
This is because 5b and more than half of the lower edge 25c can be configured so as to reliably prevent gas from leaking, and the leak of the inflation gas G can be suppressed appropriately.

Therefore, for example, the upper edge 2 of the upper expansion chamber 25
5b is made parallel to the warp V or the weft H so that the lower expansion chamber 25 expands toward the rear end 25a side.
The c may be formed obliquely in a tapered shape. Alternatively, the lower edge 25a is parallel to the warp V or the weft H, and the upper edge 25a
b may be tapered or provided with a step or the like. Further, the front side of the upper and lower edges 25b and 25c, which is the side of the gas inflow portion 23, is parallel to the warp V or the weft H, and a non-parallel portion such as a taper or a step is provided on the rear side away from the gas inflow portion 23. May be provided. Of course, the upper and lower edges 25b and 25c
May be parallel to the warp yarn V or the weft yarn H.

By the way, when a non-parallel portion which is not parallel to the warp V or the weft H is provided on the upper edge 25b or the lower edge 25c, it should be provided away from the portion 25F (see FIG. 5) adjacent to the gas inflow portion 32. Is desirable. This is because if the non-parallel portion is provided in the portion 25F adjacent to the gas inflow portion 32, a high pressure at the beginning of the inflow of the expansion gas G acts on the portion 25F, which causes gas leakage at the portion 25F. This is because there is fear.

Furthermore, in the airbag 20 of the embodiment,
Although the case where the gas inflow portion 23 is arranged on the front end side of the expansion main body portion 24 is shown, the front-back direction may be reversed. For example,
The airbag may be arranged from the rear pillar portion of the vehicle to the roof side rail portion R. Then, in that case, the inflating main body may be configured to cover the lateral vicinity of the front seat and the rear seat when the inflation is completed.

[Brief description of drawings]

FIG. 1 is a front view seen from the inside of a vehicle with an airbag according to an embodiment of the present invention stored therein.

FIG. 2 is a schematic enlarged cross-sectional view of a II-II portion of FIG.

FIG. 3 is a schematic enlarged cross-sectional view of a III-III portion of FIG.

FIG. 4 is a front view showing a deployed state of the airbag of the same embodiment when not inflated.

FIG. 5 is a view showing a fold when the airbag of the same embodiment is folded.

FIG. 6 is a front view showing a state of the airbag of the same embodiment when inflation is completed.

FIG. 7 is an enlarged cross-sectional view showing when the airbag of the embodiment is inflated, and is an enlarged cross-sectional view of a VII-VII portion of FIG.

8 is a front view of an inner plate portion of a mounting bracket used when the airbag of the same embodiment is mounted on a vehicle, and is a view seen from a direction VIII in FIG.

9 is a rear view of the outer plate portion of the mounting bracket used when the airbag of the same embodiment is attached to the vehicle, and is a view seen from the IX direction in FIG.

FIG. 10 is a side view of a mounting bracket used when mounting the airbag of the same embodiment on a vehicle.

FIG. 11 is a partial cross-sectional view of the same mounting bracket attached to an airbag, which is taken along line XI-XI in FIGS. 8 and 9.
It is an expanded sectional view of a site.

[Explanation of symbols]

20 ... airbags 23 ... Gas inflow part, 24 ... expansion main body, 25 ... Main expansion chamber, 25b ... the upper edge (of the main expansion chamber), 25c ... the lower edge (of the main expansion chamber), 26 ... Upper auxiliary expansion chamber, 27 ... Lower auxiliary expansion chamber, W ... opening, C ... fold, V ... warp, H ... weft, M: Head protection airbag device.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 2000-272460 (JP, A) JP 11-48901 (JP, A) JP 11-43004 (JP, A) JP 11-48903 (JP, A) JP-A-6-109607 (JP, A) JP-A-7-91492 (JP, A) JP-A-11-208398 (JP, A) Actual Kaihei 3-37049 (JP, U) International Publication 96/26087 (WO, A1) International publication 98/19894 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (2)

(57) [Claims] 1. A bag-shaped expansion main body that expands so as to cover an opening on the inside of the vehicle, and an expansion gas that is disposed on one end side in the front-rear direction of the expansion main body and allows the expansion gas to flow into the expansion main body. An airbag of a head protection airbag device configured to include a gas inflow portion and being folded and housed at the opening peripheral edge inside a vehicle, wherein the inflatable main body portion is substantially straight from the gas inflow portion. -Shaped main expansion chambers arranged to extend in the front-rear direction, and upper and lower parts which are respectively arranged above and below the main expansion chambers so as to communicate with end portions of the main expansion chambers which are separated from the gas inflow portion. An auxiliary expansion chamber,
The air bag is formed by double weaving of warp yarns and weft yarns, the main inflation chamber is disposed substantially parallel to the warp yarns or the weft yarns, and is folded along the main inflation chambers. An airbag for a head protection airbag device, which is folded by the eyes. 2. The total length of the upper and lower edges of the main expansion chamber is 5
The airbag of the head protection airbag device according to claim 1, wherein 0% or more is formed in parallel with the warp or the weft.