JP3421782B2 - 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 airbag for a head protection airbag device, and more particularly, it is folded and stored on the upper edge side of an opening such as a door on the inside of a vehicle, and when inflating gas flows in. The present invention relates to an airbag in which a front inflation chamber and a rear inflation chamber are arranged near the sides of a front seat and a rear seat by expanding and inflating so as to cover the opening.

[0002]

2. Description of the Related Art A conventional head protection airbag device has an airbag and a cylinder type inflator for supplying inflation gas to the airbag (German Utility Model Publication DE 29806200 U1, See British Published Patent Publication GB 2324068 etc.).

The airbag is folded and stored on the upper edge side of the opening such as a door on the inside of the vehicle, and when the inflation gas flows in, the airbag is expanded and inflated so as to cover the opening, so that the front seat and the rear seat. The front expansion chamber and the rear expansion chamber are arranged near the sides of and.

Further, the airbag has a gas inflow portion connected to the inflator on the upper rear side so that the inflation gas may flow in from the rear side.

[0005]

However, since the airbag of the conventional head protection airbag device has a structure in which the inflation gas is introduced from the rear side, the inflation gas is introduced into the front inflation chamber distant from the gas inflow portion. It was difficult to supply gas, and there was room for improvement in the rapid expansion and expansion of the front expansion chamber.

The present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an air bag of a head protection air bag device capable of rapidly expanding and inflating a front inflation chamber separated from a gas inflow portion. To do.

[0007]

Engages the present invention SUMMARY OF] Rue airbag is accommodated in folded upper edge of the interior side of the opening, a gas inlet for admitting the inflating gas is arranged on the rear upper side, A head protection airbag including front and rear inflating chambers that are inflated and inflated to cover the opening when inflating gas flows in, and are respectively arranged near the sides of the front seat and the rear seat. In the airbag of the device, a rear main flow path is formed above the rear expansion chamber, the rear main flow passage being capable of guiding the inflation gas flowing from the gas inflow portion forward to the front inflation chamber, and On the upper part of the rear expansion chamber, a communication port capable of flowing an expansion gas from the rear main flow path into the rear expansion chamber is opened,
The inner peripheral edge of the communication port on the rear main flow path side is formed with a step so that the front edge side is arranged lower than the rear edge side, and is further folded at a fold line along the rear main flow path, and at least 1 Two folds are arranged in a step area between the front edge side and the rear edge side of the inner peripheral edge of the communication opening, and are stored on the upper edge side of the opening.

[0008]

In the airbag according to the present invention, the rear main channel is linearly connected to the front main channel formed in the front-rear direction in the upper portion of the front inflation chamber, and is connected to the front end side of the front main channel. A downward-bent flow channel that is bent downward so that the expansion gas can flow in may be provided in the lower portion on the front end side of the front expansion chamber.

Further, in the airbag according to the present invention, the rear main flow passage is linearly connected to the front main flow passage formed in the front-rear direction in the upper portion of the front expansion chamber, and the front inflation chamber is connected in the front-rear direction. It is composed of a plurality of divided chambers, each of which is provided with an inlet for introducing the expansion gas from the front main flow path to the upper portion of each of the divided chambers, and the opening area of the inlet in the divided chamber on the front side. May be set to be larger than the opening area of the introduction port in the division chamber on the rear side.

[0011]

Engaging Rue airbag to the present invention is folded with folds along the rear main channel, which is housed in the upper edge of the interior side of the opening, also gas flowing the inflation gas inlet Is arranged in the upper rear part, and the rear main flow path arranged above the rear expansion chamber is connected to the gas inflow portion.

Therefore, at the beginning of the expansion and expansion, the expansion gas introduced from the gas inflow portion cancels the fold while
The gas flows from the gas inflow part to the front of the front expansion chamber through the rear main flow path.
At that time, at least one fold is arranged in a step area between the leading edge side and the trailing edge side having a step on the inner peripheral edge on the rear main flow path side of the communication port. Therefore, in order for the inflation gas to flow into the post-expansion chamber through the communication port, it will flow over the folds arranged in the step area, and a large amount of gas will be needed before the folds are released. The expansion gas will flow toward the front expansion chamber.

Further, even if the folding of the fold in the step area is canceled so that the communication port is opened, the inner peripheral edge of the communication port has a step so that the front edge side is arranged lower than the rear edge side. Is formed. That is, with respect to the rear main channel extending in the front-rear direction, the opening area of the rear main channel in the vicinity of the communication port passes above the communication port because the region on the front edge side is larger than the region on the trailing edge side in the inner peripheral edge of the communication port. It is easy and a large amount of expansion gas flows to the front side, that is, the front expansion chamber side.

[0014] Thus, the engagement Rue airbag in the present invention, the crease of the step areas, such as to close the communication port of the rear expansion chamber, and the step itself and the front edge and the rear edge side of the communicating mouth rim by, deployment and inflation The initial expansion gas easily flows to the front expansion chamber side, and the front expansion chamber separated from the gas inflow portion can be rapidly expanded and expanded.

[0015]

[0016]

[0017]

Furthermore, with respect to airbags of the present invention, when configured as described in claim 2, it is possible to obtain the operation and effect of the following. That is, the front main flow path formed in the front-rear direction in the upper part of the front expansion chamber and linearly connected to the rear main flow path allows the expansion gas to flow to the front end side and to the lower part on the front end side of the front expansion chamber. It is configured to include a downwardly curved flow path bent to. Therefore, the expansion gas that has flowed into the front main flow channel, since the front main flow channel is formed linearly with the rear main flow channel to the front end side, smoothly flows to the front end side, and further, through the downward curved flow channel, The lower part of the front expansion chamber on the front end side is smoothly filled. Therefore, in the case of such a configuration, it is possible to quickly cause the inflation gas to flow into the lower portion of the front expansion chamber farthest from the gas inflow portion, and the front expansion chamber away from the gas inflow portion. Can be further rapidly expanded.

Further, with respect to airbags of the present invention, when configured as described in claim 3, the following actions and
The effect can be obtained. That is, the expansion gas that has flowed straight into the front main flow path linearly through the rear main flow path is introduced into each division chamber through each inlet of the front expansion chamber. The inlet of the chamber is set to have a larger opening area than the inlet of the rear divided chamber. Therefore, after the expansion gas is filled up to the front end side of the front main channel, the expansion gas will be filled from the front side division chamber having the wide opening area of the introduction port before the rear side division chamber. , The front lower part of the front expansion chamber separated from the gas inflow portion is quickly expanded. Therefore, even in the case of such a configuration, the front expansion chamber separated from the gas inflow portion can be further rapidly expanded and inflated.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, a head protection airbag device M in which the airbag 18 of the first embodiment is used is an inflator for supplying inflation gas to the airbag 18 as shown in FIGS. 3 and an airbag cover 7 that covers the folded airbag 18. The airbag 18 has a door opening W inside the vehicle.
Rear pillar part PR and roof side rail part R on the upper edge side
It is folded and stored up to the R / front pillar PF.

In the embodiment, the airbag cover 7 includes the front pillar garnish 8, the lower edge 10a of the roof interior material 10, and the rear pillar garnish 12.
It consists of and. The front pillar garnish 8 and the roof interior material 10 are attached and fixed to the inner panel 1a on the vehicle body 1 side, and when the airbag 18 is deployed and inflated, the lower edges 8a and 10a are pushed by the airbag 18 to open. (See the chain double-dashed line in Figures 2 and 3).
The rear pillar garnish 12 is configured to include a front panel portion 13 that constitutes a front edge side and a rear panel portion 14 that constitutes a rear edge side, and each panel portion 13/14 is attached and fixed to the inner panel 1a. . And the airbag 18
The front edge 15 of the rear panel portion 14 is configured to be pushed and opened by the airbag 18 (see the chain double-dashed line in FIG. 4) at the time of deployment and expansion.

The inflator 3 is a cylinder type, as shown in FIG. 1, in a state in which a later-described gas inflow portion 32 of the airbag 18 is exteriorly mounted, and a mounting bracket 4 made of sheet metal is also exteriorly mounted. By mounting the mounting bracket 4 to the inner panel 1a using the mounting bolts 5, the mounting bracket 4 is mounted and fixed near the middle of the rear pillar portion PR in the vertical direction.

The airbag 18 is formed by a hollow weave using polyamide yarn or the like, and as shown in FIGS. 5, 8 and 9, an inflating portion 19 for inflating the inflating gas G to inflate in a bag shape. , A non-expansion portion 20 that does not allow the expansion gas G to flow thereinto. The inflating section 19 is configured such that when the inflating gas G flows in, the inboard side wall section 19a and the outboard side wall section 1
9b will be inflated so as to be separated (see FIG. 9).

The inflating section 19 has a gas inflow section 32,
Rear main flow path 34, communicating portion 36, front main flow path 38, rear expansion chamber 4
1, the front expansion chamber 46, and the extension portion 50 are provided. The gas inflow portion 32 is arranged in the upper rear portion of the airbag 18, has a rear end side opening, and has a cylindrical shape that can be installed on the inflator 3. Front / rear expansion chamber 46 ・ 41
Are arranged such that when the inflation gas G flows in, they are expanded and inflated so as to cover the door opening W, and are respectively arranged near the sides of the front seat and the rear seat.

Above the rear expansion chamber 41, the rear main flow path 34 is provided with a rear main flow path 34 so that the expansion gas G flowing from the gas inflow portion 32 can be guided forward and supplied to the front expansion chamber 46 side. It is formed along. The front main passage 38 is formed in the front-rear direction above the front expansion chamber 46, and is linearly connected to the rear main passage 34 with a cylindrical communication portion 36 extending in the front-rear direction in between. Further, in the case of the embodiment, the front main flow path 3
An extension portion 50 communicating with the front main flow path 38 is disposed on the front side of 8. The extension portion 50 is provided to support the outer side surface of the lower edge 8a of the front pillar garnish 8 at the time of expansion and to enhance the cushioning property of the front pillar garnish 8 (see the chain double-dashed line in FIG. 2). ).

The non-inflatable portion 20 includes a peripheral edge portion 21 arranged on the outer peripheral edge of the inflatable portion 19, extended portions 22, 23, 24, 25,
The central connecting portions 26, 27, 28 and the plate-shaped portion 29 are provided. The plate-shaped portion 29 includes front and rear expansion chambers 46,
It is provided so as to close the space between 41 and the communication portion 36. In addition, the upper edge 1 of the airbag 18 in the peripheral portion 21
A plurality of mounting portions 30 having mounting holes 30a are formed on the 8a side. As shown in FIGS. 2 and 3, two sheet metal mounting brackets 54, 54 are fixed to the mounting portions 30 so as to sandwich the mounting portion 30. And
Using the mounting bolts 55 and the mounting brackets 54, 54 that pass through the mounting holes 30a, the mounting portions 30 are fixed to the inner panel 1a, and as a result, the airbag 18 is fixed to the vehicle. .

The extended portion 22 projects forward from the peripheral edge portion 21 at the upper rear edge of the rear expansion chamber 41 along the rear main flow path 34. The extended portion 23 has a peripheral edge portion 21 on the lower edge side of the communication portion 36.
So as to extend rearward from the inside and enter the rear expansion chamber 41,
It is arranged. The extending portion 23 includes a guide portion 23a that extends obliquely downward and rearward from the peripheral edge portion 21, a tip portion 23b that curves at the rear end of the guide portion 23a and extends downward, and a curved portion near the middle of the guide portion 23a in the front-rear direction. Branch 23 extending downwards
c, and is comprised.

Then, between the vicinity of the front end of the extension portion 22 and the extension portion guide portion 23a constitutes a communication port 42 for allowing the expansion gas G to flow into the rear expansion chamber 41 from the rear main flow passage 34. . At the inner peripheral edge of the communication port 42 on the rear main flow path 34 side, the front edge 44 is arranged below the rear edge 43 of the inner peripheral edge of the communication port 42 with a step h.

Further, in this communication port 42, the guide portion 23a of the extension portion 23 extending rearward from the peripheral edge portion 21 is provided with the extension portion 22.
It is arranged diagonally so as to enter below the front end of
Regarding the expansion gas G flowing into the rear expansion chamber 41 from the rear main flow passage 34, as shown in FIG. 8, a rearward reversal flow of the expansion gas G in the rear main flow passage 34 that is reversed from the forward flow GF. GB is formed, and the expansion gas G is formed in the rear expansion chamber 41.
Is configured to flow in.

The extending portion 24 is arranged so as to extend forward from the peripheral edge portion 21 on the lower edge side of the communicating portion 36. The extending portion 25 is arranged so as to extend obliquely forward and downward from the peripheral edge portion 21 on the front edge side of the upper edge of the front main flow path 38 to the front edge side of the front expansion chamber 46.

The extension portion 25 allows the expansion gas G to flow into the front end side lower portion 46a of the front expansion chamber 46 at the front end side of the front main flow portion 38.
9 will be formed.

The central connecting portions 26, 27, 28 are arranged side by side in the front-rear direction, with the upper end located on the lower edge side of the front main flow passage 38 in the front expansion chamber 46 distant from the peripheral edge portion 21. There is. The central coupling portion 26 includes a lateral portion 26a and a lateral portion 26a.
Longitudinal portion 2 that is curved from near the middle of the front-rear direction and extends downward
6b, and the central coupling portion 27 includes a horizontal portion 27a and a vertical portion 27 that curves from the vicinity of the front end of the horizontal portion 27a and extends downward.
b, and the central coupling portion 28 is arranged in the up-down direction in a curved state.

The central connecting portions 26, 27,
By 28, the front expansion chamber 46 is arranged in the front-back direction 4
One split chamber 47 (47B1, 47B2, 47F1, 47
It is divided into F2). Each division chamber 47,
An inlet port 48 (48B1, 48B2, 48F1, 48F2) through which the expansion gas G can be introduced from the front main flow path 38
Is equipped with. The introduction port 48B1 of the division chamber 47B1 is formed between the front end of the extension portion 24 and the rear end of the central coupling portion lateral portion 26a, and the introduction port 48B2 of the division chamber 47B2 is defined as the front end of the central coupling portion lateral portion 26a. The inlet 48F1 of the division chamber 47F1 is formed between the central connecting portion lateral portion 27a and the rear end.
The inlet port 48F2 of the division chamber 47F2 is formed between the front end of the central joint portion lateral portion 27a and the upper end of the central joint portion 28.
It is formed between the upper end of the central joint portion 28 and the front edge upper portion 21 a of the front expansion chamber 46 in the peripheral edge portion 21 of the non-expansion portion 20.

These inlets 48B1, 48B2, 48
F1 and 48F2 are the extended portion 24 and the central connecting portion lateral portion 26a.
27a, the central coupling portion 28, and the front edge upper portion 21a of the peripheral edge portion, the two divided chambers 47F1 and 47F2 on the front side.
Introducing ports 48F1 and 48F2 in two are the introducing ports 48B1 and 4 in the two division chambers 47B1 and 47B2 on the rear side.
The opening area is set to be wider than 8B2.

Further, in the airbag 18 of the embodiment, the airbag 18 which has completed the inflation is provided on the front end side of the peripheral edge portion 21.
A belt 52 is attached to the lower edge side to regulate the movement of the airbag 18 to the outside of the vehicle by exerting tension. The upper end side of the belt 52 is sewn to the outer surface of the vehicle on the upper side of the front edge of the peripheral edge portion 21, and the slit 21 below
The other end is fixed to the side panel 1b of the body 1 by using a bolt 53 (see FIG. 1). 52a is a mounting hole through which the bolt 53 is inserted.

Head protection airbag device M of the first embodiment
First, the airbag 18 is folded by a predetermined folding machine. This airbag 18
As shown in Figs. 6 and 7, the folds of Fig. 6 and 7 are bellows folds with folds C of mountain folds and valley folds.
Is an airbag 1 in a state of being flatly expanded without being inflated.
8 along the upper edge 18a, and also along the rear main flow path 34 arranged in the front-rear direction. In the case of the embodiment, the predetermined folding width WC is set so that at least one fold C1 is arranged in the step area 45 between the front edge 44 side and the rear edge 43 side in the inner peripheral edge of the communication port 42. It is folded in.

After the airbag 18 is folded, a predetermined portion is wrapped with a rupturable tape for preventing the collapsing, the mounting brackets 54, 54 are fixed to the respective mounting portions 30, and the folded gas inflow portion 32 is fixed. The folding is eliminated, the inflator 3 is inserted into the gas inflow portion 32, and the mounting bracket 4 is externally attached and fixed to the gas inflow portion 32 to form an airbag assembly.

Then, using the mounting bolts 5, 55 and 53, the mounting brackets 4 and 54 are mounted and fixed to the inner panel 1a, and the ends of the belt 52 are mounted and fixed to the side panel 1b. If the panel portions 13 and 14 of the front pillar garnish 8 as the airbag cover 7, the roof interior material 10, and the rear pillar garnish 12 are attached to the panel 1a, the head protection airbag device M can be assembled to the vehicle.

When the inflator 3 is operated after the head protection airbag device M is mounted on the vehicle, the inflation gas G is supplied from the gas inflow portion 32 to the rear main flow passage 34, the communication portion 36, and the front main flow passage 38. As it flows, the rear expansion chamber 41
The expansion gas G also flows into the front expansion chamber 46 and the extension portion 50.
At that time, the front pillar garnish 8 and the lower edges 8a and 10a of the roof interior material 10 in the airbag cover 7 are pushed open, and the front edge 15 of the rear panel portion 14 of the rear pillar garnish 12 is also pushed open, and As shown by the chain double-dashed lines in FIGS. 1 to 4, the bag 18 covers the door opening W in which the front and rear door glasses DG are arranged, and covers the upper portion of the front panel portion 13 in the rear pillar portion PR. .

When the airbag 18 is deployed and inflated, the airbag 18 is folded at a fold C along the rear main flow path 34 and is stored at the upper edge side of the door opening W, and the inflation gas G is also stored. The gas inflow part 32 for inflowing is arranged in the upper rear part, and the rear main flow path 34 arranged above the rear expansion chamber 41 is connected to the gas inflow part 32.

Therefore, at the beginning of expansion and expansion, the gas inflow portion 3
The expansion gas G that has flowed in from 2 flows through the rear main flow path 34 forward from the gas inflow portion 32 toward the front expansion chamber 46 side while canceling the folding. At that time, at least one fold line C1
Is arranged in the step area 45 on the rear main flow path 34 side of the communication port 42. Therefore, in order for the expansion gas G to flow into the rear expansion chamber 41 through the communication port 42, the step area 45
The gas G flows over the fold C1 arranged in the above, and a large amount of the expansion gas G flows to the front expansion chamber 46 side until the fold of the fold C1 is canceled.

Further, even if the folding of the fold C1 in the step area 45 is canceled so that the communication port 42 is opened, the communication port 4 is opened.
The inner peripheral edge of 2 is formed with a step h so that the front edge 44 side is located below the rear edge 43 side. That is, with respect to the rear main flow passage 34 extending in the front-rear direction, the opening area of the rear main flow passage 34 near the communication port 42 is larger at the front edge 44 side portion 34b than at the rear edge 43 side portion 34a at the inner peripheral edge of the communication port 42. Therefore, a large amount of the expansion gas G flows to the front side, that is, the front expansion chamber 46 side because it easily passes above the communication port 42.

Therefore, the airbag 1 of the first embodiment.
8, the fold C1 of the step area 45 that closes the communication port 42 of the rear expansion chamber 41, and the step h itself between the front edge 44 side and the rear edge 43 side of the inner peripheral edge of the communication port 42 are used for expansion. Gas G
Is more likely to flow to the front expansion chamber 46 side, and the front expansion chamber 46 separated from the gas inflow portion 32 can be rapidly expanded and expanded.

By the way, in the embodiment, as shown in FIG. 5, the rear main flow path 34 is in a state of being flatly developed before being folded.
The length L2 of the front edge side portion 34b in the is 80 mm (φ51
Equivalent), the length L1 of the trailing edge side portion 34a is 60 mm (φ38
Equivalent). The difference between this length L1 and L2 (L2-L
1) is preferably 10 to 50 mm. If it is less than 10 mm, it is difficult to quickly deploy the front expansion chamber 46, and if it exceeds 50 mm,
This is because it is difficult to secure the volume of the rear expansion chamber 41, which is not preferable.

Further, the length L3 of the narrowest opening 42a (in the case of the embodiment, between the front end of the extended portion 22 and the rear end of the extended portion guiding portion 23a) of the communication port 42, which is the narrowest, is In order to suppress the inflow of the expansion gas G into the rear expansion chamber 41, it is desirable to make the length L2 smaller than the length L2 of the front edge side portion 34b of the rear main flow path 34 on the front expansion chamber 46 side.

Further, in the airbag 18 of the first embodiment, the extension portion 22 projecting to the front side and the lower edge side of the communication portion 36 extend obliquely downward and rearward to penetrate below the front end of the extension portion 22. With respect to the expansion gas G flowing from the rear main flow path 34 into the rear expansion chamber 41, the flow GF of the expansion gas G in the rear main flow path 34 toward the front with respect to the forward direction GF. A reverse flow GB on the rear side is formed so that the expansion gas G flows into the rear expansion chamber 41 (see FIG. 8).

Therefore, the expansion gas G is used in the rear expansion chamber 41.
Flow G of the rear main flow path 34 that flows forward when flowing in
It is necessary to invert to the rear side so as to oppose F, and it is easy to pass above the communication port 42 without inverting, and as a result, a large amount of the expansion gas G flows to the front expansion chamber 46 side. Further, the front expansion chamber 46 further away from the gas inflow portion 32 can be rapidly expanded and expanded.

Further, in the airbag 18 of the first embodiment, the front main flow passage 38 which is formed in the front-rear direction at the upper portion of the front expansion chamber 46 by the extension portion 25 and which is linearly connected to the rear main flow passage 34. The front end side lower part 46a of the front expansion chamber 46 is provided on the front end side.
A downward curved flow path 39 into which the expansion gas G can flow is formed (see FIG. 8). Therefore, the expansion gas G that has flowed into the front main flow path 38 smoothly flows to the front end side, further passes through the downward curved flow path 39, and then the front end lower portion 46a of the front expansion chamber 46.
Will be filled smoothly. Therefore, in the airbag 18 of the first embodiment, the inflation gas G can be swiftly flown into the front end side lower portion 46a of the front inflation chamber 46 that is farthest from the gas inflow portion 32, and the gas inflow portion 32 can be quickly introduced.
The front expansion chamber 46 apart from can be more rapidly expanded and inflated.

Furthermore, the airbag 1 of the first embodiment.
In FIG. 8, the front expansion chamber 46 has the central connecting portions 26, 27, 28.
According to the above, each of the four expansion chambers 47 is divided in the front-rear direction, and the expansion gas is introduced into each of the division chambers 47 communicating with the front main passage 38 formed in the front-rear direction at the upper portion of the front expansion chamber 46. Regarding the opening area, the introduction port 48 has the introduction ports 48F1 and 48 in the division chambers 47F1 and 47F2 on the front side.
F2 is set so as to have a larger opening area than the inlet ports 48B1 and 48B2 in the division chambers 47B1 and 47B2 on the rear side. Therefore, when the airbag 18 is deployed and inflated, the inflation gas G is filled up to the front end side of the front main flow path 38, and then from the division chambers 47B1 and 47B2 on the rear side.
First, the division chamber 47 on the front side where the opening area of the inlet port 48 is large.
The front lower portions 46a and 46b of the front expansion chamber 46, which are filled in the F1 and F2 and separated from the gas inflow portion 32, are quickly expanded. Therefore, the airbag 1 of the first embodiment
In 8, the front expansion chamber 46 separated from the gas inflow portion 32 can be further rapidly expanded and expanded.

In the embodiment, the introduction ports 48B1.4
Regarding the opening areas of 8B2, 48F1 and 48F2, the opening area of the inlet 48F1> the opening area of the inlet 48F2> the opening area of the inlet 48B1 = the opening area of the inlet 48B2 is set to be the relationship of the opening area of the inlet 48F2. > The opening area of the introduction port 48F1> The opening area of the introduction port 48B2> The opening area of the introduction port 48B1. Is also good.

When the inflation gas is inverted from the rear main flow passage to flow into the rear inflation chamber, the rear inflation chamber 41, like the airbag 58 of the second embodiment shown in FIG. The front edge 44 side and the rear edge 43 side of the inner peripheral edge on the rear main flow path 34 side of the communication port 42 may be arranged at the same height position. In the communication port 42, an extending portion 22 extending forward from an upper portion of a rear edge of the rear expansion chamber 41 in the peripheral edge portion 21 extends forward, and an extending portion extending rearward from an upper portion of a front edge of the rear expansion chamber 41 in the peripheral edge portion 21. The guide portion 23a of the portion 23 is disposed below the extension portion 22, and the extension gas 22 and the extension portion guide portion 23a allow the expansion gas G to flow through the rear main flow path at the site of the communication port 42. It is reversed from 34 and made to flow into the rear expansion chamber 41. Also in this airbag 58, the inflation gas G needs to be reversed to the rear side so as to oppose the flow GF of the rear main flow path 34 flowing to the front side when flowing into the rear expansion chamber 41 at the time of expansion and inflation. Therefore, a large amount of the expansion gas G flows to the front expansion chamber 46 side easily without passing over, and the front expansion chamber 46 separated from the gas inflow portion 32 is quickly expanded. Can be inflated.

By the way, even when the expansion gas is inverted from the rear main flow path to flow into the rear expansion chamber, the narrowest communication port 42 is provided so as to prevent the expansion gas from flowing into the rear expansion chamber. The opening area of the narrow opening portion 42a is set to the area 3 near the front edge 44 of the communication hole 42 in the rear main flow path 34.
It is desirable to make it smaller than the opening area of 4b.

Further, in the case where the expansion gas is reversed from the rear main flow passage to flow into the rear expansion chamber,
Like the airbag 68 of the third embodiment shown in FIGS. 11 and 12, the fold C, which is folded into a bellows, may not be along the rear main flow path 34. In this airbag 68, the rear main flow path 34 is diagonally forward from the gas inflow portion 32 so as to intersect with the fold C provided in the front-rear direction along the upper edge 68a of the airbag 68 in the state of being flattened. It is formed downward.

Similar to the first embodiment, the airbag 68 is formed by bag-weaving from polyamide yarn or the like, and the inflating gas G flows into the inflating portion 6 to inflate in a bag-like shape.
9 and the non-expansion part 70 that does not allow the expansion gas G to flow inside
And are provided. The inflating section 69 is inflated so as to separate the vehicle inner side wall section 69a and the vehicle outer side wall section 69b when the inflating gas flows in.

The inflating section 69 is disposed in the upper rear portion of the airbag 68 and is a cylindrical gas inflow portion 82 which is mounted on the inflator 3 (not shown), and the rear main flow passage 84 is disposed in the upper portion of the rear inflating chamber 91. A communication portion 86 that linearly extends obliquely forward and downward from the rear main flow passage 84, a front main flow passage 88 that linearly extends from the communication portion 86 and that is disposed at a substantially intermediate portion in the vertical direction of the front expansion chamber 96; The front expansion portion 96 includes an extension portion 50 that extends forward from an upper front portion of the front expansion chamber 96. Then, the front and rear expansion chambers 96 and 91 are expanded and inflated so as to cover the door opening on the inside of the vehicle when the inflating gas flows in, so that the front and rear expansion chambers 96 and 91 are arranged near the sides of the front seat and the rear seat, respectively. It is arranged. Further, the front expansion chamber 96 has a front main flow path 88,
Upper and lower chambers 97 and 98 disposed above and below the front main flow path 88
It consists of and.

The non-inflatable portion 70 includes a peripheral edge portion 71 arranged on the outer peripheral edge of the inflatable portion 69, extending portions 72, 73, 74 and 75,
The central connecting portion 76 and the plate-shaped portion 79 are provided. The plate-shaped portion 79 is provided so as to close the space between the front / rear expansion chambers 96/91 and the communication portion 86. Further, a mounting portion 80 having a mounting hole 80a is formed on the side of the upper edge 68a of the airbag 68 in the peripheral portion 71. A mounting bracket 54, not shown, is attached to these mounting portions 80.
54 will be fixed.

The extending portion 72 projects forward from the peripheral portion 71 at the upper rear edge of the rear expansion chamber 91 along the rear mainstream portion 84. The extended portion 73 is located below the extended portion 72 and is located in the rear expansion chamber 9
From the peripheral edge portion 71 on the trailing edge side of the No. 1, it projects forward along the rear mainstream portion 84. The extended portion 74 is arranged so as to extend rearward from the peripheral edge portion 71 on the lower edge side of the communication portion 86 and enter the rear expansion chamber 91. The extending portion 75 is provided so as to extend obliquely forward and downward from the peripheral edge portion 71 so as to define the upper edge side of the front main channel 88. The central connecting portion 76 is
The front main flow passage 88 is defined so as to define the lower edge side of the front main flow passage 88.
It is formed along.

The vicinity of the front end of the extended portion 72 and the extended portion 7
4 forms a communication port 92 through which the expansion gas G flows from the rear main flow path 84 into the rear expansion chamber 91. The communication port 92 has an extending portion 7 extending rearward from the peripheral portion 71.
4 is arranged so as to enter below the front end of the extended portion 72 extending forward long, and with respect to the expansion gas G flowing into the rear expansion chamber 91 from the rear main flow passage 84, the rear main flow passage 84 is provided.
The rearward reversal flow GB that is reversed from the forward flow GF of the expansion gas G in (1) is formed so that the expansion gas G flows into the rear expansion chamber 91.

Therefore, also in this airbag 68, when the inflation gas G flows into the rear inflation chamber 91 during deployment and inflation, the inflation gas G is directed to the rear side so as to oppose the flow GF of the rear main channel 94 flowing to the front side. It is necessary to invert, it easily passes above the communication port 92, and a large amount of the expansion gas G flows to the front expansion chamber 96 side, so that the front expansion chamber 96 separated from the gas inflow portion 82 is quickly expanded and expanded. Can be made.

Incidentally, the airbag 18 of the first to third embodiments.
In 58 and 68, the front main flow channels 38 and 88 are connected to the communication part 36.
The case where they are arranged in a straight line from the rear main channels 34 and 84 with 86 interposed is shown. However, the rear main flow paths 34 and 84
Is placed above the rear expansion chambers 41 and 91, and the communication port 42
92 is configured to generate the reverse flow GB, or at the inner peripheral edge of the communication port 42 on the rear main flow path 34 side,
There is a step h in which the front edge 44 is located below the rear edge 43,
If there is at least one fold C1 along the rear main flow path 34 in the step area 45, a large amount of inflation gas can be supplied to the front inflation chamber side at the beginning of the inflation and inflation of the airbag. Therefore, the front main flow path may be configured to be bent in an inverted L shape from the rear main flow path on the upper side of the airbag and to be arranged in the lower part of the front inflation chamber.

[Brief description of drawings]

FIG. 1 is a front view of a head protection airbag device in which an airbag according to a first embodiment of the present invention is used, viewed from the inside of a vehicle.

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

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

FIG. 4 is an enlarged cross-sectional view of the IV-IV portion of FIG.

FIG. 5 is a front view showing a state in which the airbag of the same embodiment is flatly deployed.

FIG. 6 is a view showing a fold when the airbag of the same embodiment is folded.

FIG. 7 is a cross-sectional view of the vicinity of a communication port of the rear inflation chamber of the airbag during folding.

FIG. 8 is a front view of the airbag alone according to the embodiment when deployed and inflated.

9 is an enlarged cross-sectional view of the IX-IX portion of FIG.

FIG. 10 is a front view of the vicinity of a rear inflation chamber showing a state in which the airbag of the second embodiment is flatly deployed.

FIG. 11 is a front view showing a flattened state of the airbag of the third embodiment.

FIG. 12 is a view showing a fold when the airbag of the same embodiment is folded.

[Explanation of symbols]

18.58.68 ... Airbag, 32.82 ... Gas inflow part, 34.84 ... Rear main flow channel, 38.88 ... Front main flow channel, 39 ... Downward curved flow channel, 41.91 ... Rear expansion chamber, 42. 92 ... Communication port, 43 ... (Communication port) rear edge, 44 ... (Communication port) leading edge, 45 ... Step area, 46/96 ... Front expansion chamber, 46a ... (Front expansion chamber) front end lower part, 47 (47F1, 47F2, 47B1, 47B2) ... Dividing chamber, 48 (48F1, 48F2, 48B1, 48B2) ... Inlet port, C / C1 ... Fold, h ... Step, W ... Opening, G ... Expansion gas, M … Head protection airbag device.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Urushi, Toyota Town, Toyota City, Aichi Prefecture, Toyota 1 (72) Inventor, Etsuhisa Mimura Toyota City, Toyota City, Aichi Prefecture, Toyota Motor Corporation (( 56) References JP 10-119703 (JP, A) JP 11-48903 (JP, A) JP 2000-127886 (JP, A) International Publication 96/026087 (WO, A1) (58) Survey Areas (Int.Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (3)

(57) [Claims] 1. A gas inflow portion, which is folded and housed on the upper edge side of an opening on the inside of a vehicle, is arranged on the rear upper side, and which inflows inflation gas, and when the inflation gas flows in, covers the opening. A airbag for a head protection airbag device, comprising: front and rear inflation chambers that are inflated and inflated and are respectively arranged near the sides of the front seat and the rear seat. A rear main flow path that guides the expansion gas flowing from the gas inflow portion forward and can supply the expansion gas to the front expansion chamber is formed above, and the expansion gas is provided above the rear expansion chamber. A communication port that can flow into the rear expansion chamber from the main flow channel is opened, and an inner peripheral edge of the communication main port on the rear main flow channel side is formed with a step so that the front edge side is located lower than the rear edge side. In addition, when it is folded along the fold line along the rear main flow path, , At least one fold is arranged in a step area between a front edge side and a rear edge side in the inner peripheral edge of the communication port, and is stored on the upper edge side of the opening, and the air of the head protection airbag device is characterized in that bag. 2. The rear main flow path is linearly connected to a front main flow path formed in the front-rear direction in the upper part of the front expansion chamber, and the front end side of the front main flow path has a front end side of the front expansion chamber. The airbag of the head protection airbag device according to claim 1, wherein a downwardly curved flow path bent downward is provided so that the inflation gas can flow into the lower portion. 3. The rear main flow channel is linearly connected to a front main flow channel formed in the front-rear direction at an upper portion of the front expansion chamber, and the front expansion chamber is divided into a plurality of divided chambers in the front-rear direction. Each of the division chambers is provided with an introduction port capable of introducing an expansion gas from the front main flow channel in the upper portion, and the introduction port in the front division chamber is in the rear division chamber. The airbag of the head protection airbag device according to claim 1 or 2 , wherein the opening area is set to be wider than the introduction port.