JP2000335353A - Airbag for head protection airbag device - Google Patents

Abstract

(57) [Object] To provide an airbag for a head protection airbag device capable of quickly arranging an area capable of restraining an occupant before inflation is completed. An airbag (20) is arranged at one end in the front-rear direction of a bag-shaped inflatable main body (24) that inflates to cover an opening on the inside of a vehicle, and is provided to the inflatable main body (10).
And a gas inflow portion 23 for inflowing gas. The main expansion chamber 24 is communicated with a main expansion chamber 25 disposed to extend substantially linearly in the front-rear direction from the gas inflow section, and an end of the main expansion chamber remote from the gas inflow section to form a main expansion chamber. And upper and lower sub-expansion chambers 26 and 27 which are respectively arranged above and below. The airbag 20 is formed by weaving a warp V and a weft H. The main expansion chamber 25 is disposed substantially parallel to the warp V or the weft H. Then, the airbag 20 is folded at a fold along the main inflation chamber 25 and is stored at the periphery of the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for a head protection airbag device mounted on an automobile, and more particularly, to an airbag which is folded and housed around an opening inside the vehicle, and which is opened when inflation gas flows. The present invention relates to an airbag of a head protection airbag device that inflates to cover the airbag.

[0002]

2. Description of the Related Art Conventionally, an airbag of this type of head protection airbag apparatus has been disclosed in International Publication No.
As described in No. 26087 and British Patent Application No. 2314300, etc., a gas inflow portion for inflow of inflation gas, and a bag-shaped inflatable so as to cover the opening inside the vehicle by communicating with the gas inflow portion. And an expansion main body.

[0003] The bag-shaped inflatable body has a configuration in which, when inflated, a plurality of non-inflatable portions in the vertical direction are arranged in parallel in the horizontal direction, and expansion chambers extending in the vertical direction are arranged in parallel in the horizontal direction.
Further, the gas inflow portion is disposed 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 configuration, the inflation gas flows downwardly into each of the expansion chambers via the gas inflow section.
Since the gas inflow portion is arranged at the periphery of the opening, it takes time until each expansion chamber expands to some extent, and there is room for improvement in that an area capable of restraining an occupant quickly and widely before the expansion is completed is provided. there were.

An object of the present invention is to provide an airbag for a head protection airbag device capable of quickly arranging an area capable of restraining an occupant before inflation is completed. With the goal.

[0006]

An airbag according to the present invention comprises a bag-shaped inflatable main body which is inflated so as to cover an opening inside a vehicle, and an airbag which is disposed at one end in the front-rear direction of the inflatable main body. A gas inflow portion for causing inflation gas to flow into the inflation main body portion, wherein the airbag of the head protection airbag device is folded and housed in the periphery of the opening on the inside of the vehicle, The main expansion chamber is arranged so that the expansion main body extends substantially linearly in the front-rear direction from the gas inflow section, and the main expansion chamber communicates with an end of the main expansion chamber remote from the gas inflow section to form the main expansion chamber. On top and bottom of the expansion chamber
A lower auxiliary inflation chamber, and wherein the airbag is
The main inflation chamber is formed by bag weaving with a warp and a weft, the main inflation chamber is disposed substantially parallel to the warp or the weft, and is folded at a fold along the main inflation chamber. I do.

Further, it is desirable that at least 50% 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 protection airbag apparatus according to the present invention, when the inflation gas flows, the inflation gas flows into the main inflation chamber in the inflation main body through the gas inflow portion. The inflation gas flows from the expansion chamber into the upper and lower auxiliary expansion chambers.

That is, before the inflation gas flows into the upper and lower auxiliary inflation chambers and the airbag completes inflation, the main inflation chamber is inflated, 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 also in the vertical middle part of the upper and lower sub-expansion chambers, that is, in the vertical middle part of the expansion main body part in the front-rear direction. Since it is arranged long, it expands in a wide area.

Therefore, the airbag of the head protection airbag device according to the present invention can inflate the main inflation chamber quickly and over a wide area before the inflation is completed. Before completion, the occupant can be restrained quickly and with a large area.

Further, in the airbag according to the present invention, the airbag is formed by weaving a warp and a weft, so that the airbag can be easily manufactured without stitching or bonding the periphery.

Further, a main inflation portion is provided substantially parallel to the warp or the weft, and the airbag is folded at a fold along the main inflation chamber. Obtainable.

That is, when the main expansion chamber expands, a large tensile force acts on the upper edge and the lower edge which are the boundary portions with the non-expandable portion at the periphery of the main expansion chamber. But,
The main inflation chamber is substantially parallel to the warp or weft, and since the mesh of the woven structure at the upper and lower edges of the main inflation chamber is difficult to spread (since misregistration hardly occurs), the upper edge of the main inflation chamber Leakage of the inflation gas can be suppressed from the bottom edge.

The high-pressure inflation gas initially flowing into the main inflation chamber is arranged so that the main inflation chamber extends substantially linearly in the front-rear direction from the gas inflow portion. Flows linearly toward the end portion away from the gas inflow portion along the line. Since the fold is formed along the main expansion chamber extending in the front-rear direction, the high-pressure inflation gas that flows linearly to the end portion away from the gas inflow portion crosses the fold orthogonally. Do not collide. Therefore, the inflation gas is
Rather than canceling the fold, go to the end side away from the gas inflow part, suppress the application of high pressure partially to the fold part, and prevent the weave of the woven part of the fold part from expanding be able to.

On the other hand, if the fold is provided so as to intersect with the main expansion chamber which is provided so as to extend in the front-rear direction, the high pressure expansion at the beginning of the flow into the main expansion chamber is provided. While the gas proceeds linearly to the end side away from the gas inlet,
It hits the fold part that intersects with the main expansion chamber, and it gets over the fold part linearly and eliminates the fold,
At the time of the elimination of the fold, high pressure is partially applied to the fold portion intersecting with the main inflation chamber, and the mesh of the woven tissue at the fold portion is expanded, so that leakage of the inflation gas is reduced. I will invite you.

Therefore, in the airbag according to the present invention, leakage of the inflation gas can be suppressed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The airbag 20 of the embodiment shown in FIGS. Pillar part PF and roof side rail part R
And the head protection airbag device M disposed over
What is used.

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

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

The mounting bracket 15 is made of sheet metal and sandwiches the inflator 18 having the gas inflow portion 23 of the airbag 20 from the outer peripheral side together with the gas inflow portion 23.
It is attached to the side panel 2 using the bolts 16.

The airbag cover 11 is composed of a pillar garnish 12 disposed on the front pillar PF and a roof interior material 13 disposed on the roof side rail 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 body 4 by attaching means (not shown), and projects the airbag 20 when the airbag 20 is inflated. The door portion 12a is configured to be pushed and opened as much as possible. The roof interior material 13 is also made of synthetic resin and is fixedly attached to the sheet metal roof side rail main body 9 by attachment means (not shown) as shown in FIGS. The roof interior material 13 also allows the airbag 20 to protrude 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 reinforcement panel 5, an outer panel 6, and an inner panel 7, and includes a roof side rail body 9 and a side panel 2.
At the same time, the body 1 is constituted.

As shown in FIGS. 4 to 7, the airbag 20 is made of a flexible bag and uses polyamide yarn or the like for the warp yarn V and the weft yarn H. The airbag main body 21 is formed by bag weaving, and a belt portion 35 sewn to the rear edge 30a of the airbag main body 21 and made of a woven fabric using a polyamide thread or the like. Have been.

The airbag body 21 includes the inflator 1
The inflating gas from 8 flows in and is expanded from the folded state, and the inside and outside walls 21a and 21b (see FIG. 7).
An inflatable portion 22 that inflates to increase the thickness apart from each other;
And a non-expandable portion 29 not increasing in thickness.
The airbag body 21 is woven in a bag, and
After forming 9, silicon or the like may be applied to the surface side in order to improve heat resistance and sealing properties.

The inflating portion 22 extends rearward in communication with the gas inflow portion 23 disposed at the front end side for inflow of inflation gas, and inflates to cover the opening W inside the vehicle. And a bag-shaped inflatable main body 24.

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

The inflation main body 24 is disposed so as to extend linearly rearward from the gas inflow part 23, and is disposed substantially in parallel with the weft H of the woven structure of the airbag main body 21. 25, and upper and lower auxiliary expansion chambers 26 and 27 which are communicated with the rear end 25a side of the main expansion chamber 25 and are respectively arranged above and below the main expansion chamber 25.

The non-inflating portion 29 is woven and formed such that the vehicle inner side wall portion 21a and the vehicle outer side wall portion 21b of the airbag body 21 are joined, and the gas inflow portion 23 and the inflating main body portion 2 are formed.
A peripheral portion 30 which is woven densely so as to ensure airtightness at an outer peripheral edge of the outer peripheral portion 4 and an inflatable main body portion 2 from the front side of the peripheral portion 30.
Upper and lower regulating portions 31 and 32 extending rearward in the area of No. 4;
It is provided 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 parallel to the first restricting portion 31a. The second restricting portion 31d is connected to the upper auxiliary expansion chamber 26.
It serves to regulate the thickness of the rubber when it is inflated.

The first regulating portion 31a of the upper regulating portion 31
And the lower regulating portion 32 are formed by upper and lower edges 25 b of the main expansion chamber 25.
25c. The upper edge 25b of the main inflation chamber 25 defined by the lower edge 31c of the first restrictor 31a extends over the entire length of the weft H in the weave structure of the airbag body 21. The lower regulating portion 32 has a step near the middle of the upper edge 32b in the front-rear direction, and gradually lowers downward.
The lower edge 25c of the main inflation portion 25b regulated by the upper edge 32b of the lower regulation portion 32 is disposed in the front-rear direction so as to be substantially parallel to the weft H in the weave structure of the airbag body 21 over the entire length. Have been. In the case of the embodiment, the lengths Ld and L of the inclined non-parallel portions 25d and 25e at the lower edge 25c of the main expansion portion 25 along the main expansion portion 25.
The sum of e is 9% of the sum 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 parallel to 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 with the rear edge 30a of the peripheral portion 30 which is disposed substantially vertically. Are arranged with a gap between the inflation gas G and the trailing edge 30a.
Inlets 26a of the upper and lower sub-expansion chambers 26 and 27 for inflow of air
27a.

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

Each of the mounting brackets 37 is shown in FIGS.
As shown in FIG. 11, the inner plate portion 38 on the inside of the vehicle and the outer plate portion 3 on the outside of the vehicle, which are made of sheet metal and have the mounting portion 33 therebetween.
9 is provided. These inner / outer plate portions 38 and 39 are connected to a band-like connecting portion 40 at two locations on the upper edge side.
Are interconnected. Inner / outer plate 3
As shown in FIGS. 8 and 9, mounting holes 38a and 39a through which the mounting bolts 41 are inserted are formed in the centers of the holes 8 and 39. As shown in FIGS. 8 and 11, locking holes 38b each having 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 inner peripheral edge of each locking hole 38b is formed. , A triangular plate-shaped projection 38c is formed. further,
As shown in FIGS. 8 and 10, a hook-shaped locking piece 38 d protruding to the outside of the vehicle is formed on the end side of the inner plate portion 38. The locking piece 38d is locked to a peripheral edge of a locking hole (not shown) provided in the inner panel 7 or the roof side rail main body 9 to prevent the mounting bracket 37 from dropping and to attach the mounting bracket 37 to the inner panel 7 or 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 both left and right sides of the mounting hole 39a of the outer plate portion 39, FIGS.
As shown in FIG. 11, a locking leg 39 b is formed to protrude and bend back into the vehicle. These locking legs 39b are
The inner plate 38 is locked to the protruding piece 38c at the inner peripheral edge of each locking hole 38b.

The mounting bracket 37 is fixed to each mounting portion 33 by the inner and outer plate portions 3 which are opened 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 and outer plates 8 and 39, and the locking legs 39 b of the outer plate portion 39 are connected to the inner plate via the through holes 33 b of the mounting portion 33. This is performed by engaging the projection 38c of the portion 38 (see FIG. 11). Then, the locking piece 38d is locked to the not-shown inner panel 7 or the periphery of the locking hole of the roof side rail main body 9, and the mounting bolt 41 is attached to the mounting holes 38a, 33a, 39a as shown in FIGS. The airbag 20 is attached to the body 1 by being screwed into the nuts 7b and 9b fixed to the inner panel 7 and the mounting holes 7a and 9a on the periphery of the roof side rail body 9 through the inner panel 7 and the roof side rail body 9. Becomes

In the case of the embodiment, the belt portion 35 has a three-pronged shape provided with mounting pieces 35a, 35b and 35c, and the ends of the mounting pieces 35a and 35b are sewn up and down on the rear edge 30a of the airbag body 21. Is being worn. Mounting piece 35
At the end of c, a mounting hole 35d is formed, and after the airbag 20 is folded, the mounting bracket 37 is mounted. Then, similarly to the mounting portion 33, the mounting piece 35c is fixed to the roof side rail main body 9 with the bolt 41 fixed thereto.

The belt portion 35 is set to have a predetermined length so that a 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. I have.

When the airbag 20 is folded, as shown in FIG. 5, a fold C is formed along the main inflation chamber 25, and the airbag 20 in the deployed state is bellowed from the lower edge to the upper edge. . Further, after folding, a breakable tape material is wound at predetermined intervals so as not to be broken.

After being folded, the mounting piece 35c of the belt 35 is pulled out, and the front mounting part 33 is pulled out, so that the mounting brackets 37 are attached to all the mounting parts 33 and the mounting pieces 35c. The gas inlet 23 is pulled out, the inflator 18 is inserted into the gas inlet 23, and the mounting bracket 15 is attached to the outer periphery of the gas inlet 23 to form an airbag assembly.

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 body 9 so that the mounting bracket 15
Is placed at a predetermined position on the side panel 2 and the bolt 1
6 and the mounting brackets 37 are fixed to the inner panel 7 and the roof side rail body 9 by 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 of the upper edge 30b of the peripheral edge portion 30 disposed on the front pillar portion PF is lowered straight forward so that the front end side is lowered (FIG. 1). 6).

When the inflator 18 is operated after being mounted on the vehicle, the inflation gas from the inflator 18
The airbag 20 is supplied to the inflation main body 24 via the gas inflow section 23, and the airbag 20 breaks the wound tape material (not shown) and pushes the pillar garnish 12 and the roof interior material 13 to open each door. Part 1
2a and 13a are opened, and greatly expanded so as to cover the opening W as shown by a two-dot chain line in FIGS.

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

That is, before the inflation gas G flows into the upper and lower inflation chambers 26 and 27 and the airbag 20 completes inflation, the main inflation chamber 25 is inflated. Since it extends rearward in a straight line from the gas inflow portion 23, it expands quickly, and the upper and lower auxiliary expansion chambers 2
Since it is arranged long in the front-rear direction at the vertical intermediate portion of the inflatable body 6.27, that is, at the vertical intermediate portion of the expansion main body 24, it expands in a wide area.

Therefore, the airbag 20 of the embodiment is
Before the inflation is completed, the main inflation chamber 25 can be quickly and over a large area.
Can be inflated, and the area of the main inflation chamber 25 allows the occupant to be quickly and accurately restrained with a large area before the inflation is completed.

When the inflation of the airbag 20 is completed, as shown in FIG. 6, the lower edge 30c of the airbag body 21 is pulled rearward by the rear belt portion 35.

In the airbag 20 of the embodiment, the airbag body 21 is formed by sack weaving with the warp threads V and the weft threads.
The airbag 20 can be easily manufactured.

Further, in the airbag 20 of the embodiment,
When the main expansion chamber 25 expands, 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 part 29 (the first restriction part 31a and the lower restriction part 32) on the periphery of the main expansion chamber 25. Works. However, the main inflation chamber 25 is substantially parallel to the weft H of the weave structure, and
Since the mesh of the woven structure at b and the lower edge 25c is difficult to spread (because misregistration hardly occurs), it is possible to suppress the leakage of the inflation gas G from the upper edge 25b and the lower edge 25c of the main expansion chamber 25. it can.

The inflation gas G having a high pressure at the beginning of the flow into the main inflation chamber 25 is arranged such that the main inflation chamber 25 extends rearward from the gas inflow portion 23 in a substantially linear manner. Along the main expansion chamber 25, the air flows linearly toward the rear end 25a away from the gas inflow portion 23. Since the fold C is formed along the main inflation chamber 25 extending in the front-rear direction, the high-pressure inflation gas G that flows linearly toward the rear end 25a away from the gas inflow portion 23 is Creases C1, C2, C3, C4, C5, C6 arranged in the region of the expansion chamber 25
-It does not collide with each of the fold portions 25f of C7 and C8 so as to intersect at right angles, and proceeds to the rear end 25a side farther from the gas inflow portion than to cancel the fold. Therefore, the inflation gas G is
Each fold C1, C2, C3, C4, C5, C6, C7, C
No pressure is applied locally to the fold portions 25f of FIG. 8, and pressure is applied to the entire area that is long in the front-rear direction of each fold portion 25f, thereby eliminating the fold. Without expanding the mesh, gas leakage from each fold portion 25f can be suppressed (see FIG. 5).

Therefore, in the airbag 20 of the embodiment, the leakage of the inflation gas G can be suppressed, and the time until the inflation is completed can be shortened.

Further, 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.
Are formed in parallel with the weft H, and are the upper edge 25b and the lower edge 25c which are boundary portions with the non-expandable portion 29 in the main expansion chamber 25.
Can be configured so that gas leakage hardly occurs, and leakage of the inflation gas G can be accurately suppressed.

Further, in the airbag 20 of the embodiment,
As shown in FIG. 4, the first and lower regulating portions 31 a and 32 are arranged in a direction substantially orthogonal to a rear edge 30 a of the peripheral portion 30 which is arranged in a substantially vertical direction, and the rear end of the main expansion chamber 25. On the 25a side, a rear edge 30a of the non-expandable portion 29 extending substantially vertically in the upper and lower auxiliary expansion chambers 26 and 27 is provided. Also, 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 facing up and down. Therefore, at the beginning of the inflow of the inflation gas G, the inflation gas G passing through the main inflation chamber 25 is
The upper and lower sub-expansion chambers are guided by the rear edge 30a extending substantially in the vertical direction, smoothly separate vertically and flow into the upper and lower sub-expansion chambers 26 and 27 via 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 inflation chamber 25 is made parallel to the weft H of the weaving structure, and the lower edge 25c of the main inflation chamber 25 is provided with a slight step to provide a weaving structure. Is substantially parallel to the weft H of FIG. However, the main inflation chamber 25 may be set substantially parallel to the warp V of the weaving structure, depending on the manner of cutting the woven fabric.

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 weaving structure, and the lower edge 25c of the main inflation chamber 25 is provided with a slight step. Assuming that the upper edge 25b and the lower edge 25c of the main expansion chamber 25 are substantially parallel to the weft H of the weave,
The case where 1% was made parallel to the weft H of the woven structure was shown.
However, it is sufficient that at least 50% 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 warp V or the weft H of the woven structure. This is because the upper edge 2 serving as a boundary portion with the non-expandable portion 29 in the main expansion chamber 25
This is because more than half of the lower edge 5b and the lower edge 25c can be configured so as to be less likely to leak gas, and the leak of the inflation gas G can be accurately suppressed.

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

When a non-parallel portion which is not parallel to the warp yarn V or the weft yarn H is provided at the upper edge 25b or the lower edge 25c, the non-parallel portion is 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 inflation gas G acts on the portion 25F, thereby causing gas leakage in the portion 25F. This is because there is a fear.

Further, in the airbag 20 of the embodiment,
Although the case where the gas inflow portion 23 is disposed on the front end side of the expansion main body portion 24 is shown, the front-rear direction may be reversed. For example,
An airbag may be provided from the rear pillar portion of the vehicle to the roof side rail portion R. In this case, the inflatable body may be configured to cover the vicinity of the sides of the front seat and the rear seat when the inflation is completed.

[Brief description of the drawings]

FIG. 1 is a front view of a state in which an airbag according to an embodiment of the present invention is stored, as viewed from the inside of a vehicle.

FIG. 2 is a schematic enlarged cross-sectional view taken along a line II-II in FIG.

FIG. 3 is a schematic enlarged sectional view of a III-III part in FIG. 1;

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

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

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

FIG. 7 is an enlarged cross-sectional view showing the airbag according to the embodiment at the time of completion of inflation, and is an enlarged cross-sectional view of a portion VII-VII in FIG. 6;

FIG. 8 is a front view of an inner plate portion of a mounting bracket used when the airbag of the embodiment is mounted on a vehicle, as viewed from the direction VIII in FIG. 10;

FIG. 9 is a rear view of an outer plate portion of a mounting bracket used when the airbag of the embodiment is mounted on a vehicle, and is a view as seen from a direction IX in FIG. 10;

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

FIG. 11 is a partial cross-sectional view showing a state where the mounting bracket is mounted on the airbag, and FIGS.
It is an expanded sectional view of a part.

[Explanation of symbols]

 Reference Signs List 20: airbag, 23: gas inflow section, 24: inflating body section, 25: main inflation chamber, 25b: upper edge (of main inflation chamber), 25c ... lower edge (of main inflation chamber), 26: upper sub inflation Chamber, 27: Lower sub-inflation chamber, W: Opening, C: Fold, V: Warp, H: Weft, M: Head protection airbag device.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mitsuyoshi Ohno 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F term (reference) 3D054 AA07 AA16 AA18 CC04 CC06 CC29 CC42 FF11 FF17

Claims (2)

[Claims] 1. A bag-shaped inflatable main body that inflates to cover an opening on the inside of a vehicle, and is disposed at one end in the front-rear direction of the inflatable main body to allow inflation gas to flow into the inflatable main body. And a gas inflow portion, wherein the airbag of the head protection airbag device is folded and housed in the periphery of the opening inside the vehicle, wherein the inflation main body portion is substantially straight from the gas inflow portion. A main expansion chamber disposed so as to extend in the front-rear direction, and upper and lower portions respectively disposed above and below the main expansion chamber by being communicated with an end of the main expansion chamber that is separated from the gas inflow portion. A sub-expansion chamber,
The airbag is formed by sachet weaving with a warp and a weft, and the main inflation chamber is disposed substantially parallel to the warp or the weft, and a fold along the main inflation chamber is provided. An airbag for a head protection airbag device, wherein the airbag is folded with eyes. 2. The total length of the upper edge and the lower edge of the main expansion chamber is 5
The airbag for a head protection airbag device according to claim 1, wherein 0% or more is formed in parallel with the warp or weft.