JP3506066B2 - 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 a head protection airbag device mounted on a vehicle.

[0002]

2. Description of the Related Art As one of head protection airbag devices,
An airbag that inflates and deploys like a curtain on the side of the passenger compartment is provided with a rear seat inflating portion and a gas introducing portion at the rear portion thereof and is assembled along at least a quarter pillar and side rails of the vehicle body. There is one that projects rearward above the inflatable portion for the rear seat and is connected to an inflator assembled to the quarter pillar, and is disclosed in, for example, German Patent DE 29806200.

[0003]

In the head protection airbag apparatus of the above-mentioned type, the rear seat inflating portion of the airbag is folded and stored in the vertical direction, and the stored rear seat inflating portion is housed in the roof. While being covered by the peripheral portion of the headlining, the rear end of the gas introduction portion of the airbag may be covered by the upper portion of the quarter pillar garnish connected to the peripheral portion of the roof headlining.

In this case, gas is supplied from the inflator into the air bag, and the air bag deforms the peripheral portion of the roof head lining toward the passenger compartment and deploys it to form a curtain at the side portion of the passenger compartment. When inflating and deploying, the rear airbag inflatable section interferes with the upper part of the quarter pillar garnish, and the rear pillar inflatable portion is prevented from deploying by the quarter pillar garnish. The pillar garnish may be removed.

As a countermeasure against this, the roof head lining and the quarter pillar garnish are formed into a special shape with a large curve, or a special structure is adopted at the upper part of the quarter pillar garnish that deforms toward the passenger compartment when the airbag is deployed. However, there are cases where sufficient measures cannot be taken due to manufacturing restrictions, external restrictions, and the like.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an airbag that inflates and deploys like a curtain on the side of the passenger compartment is provided at the rear of the airbag. And a gas introduction part, which is assembled along at least the quarter pillar of the vehicle body and the side rail, and the gas introduction part projects rearward above the inflating part for the rear seat to an inflator assembled to the quarter pillar. In the head protection airbag device configured to be connected, the rear portion of the rear seat inflatable portion is formed so that the rear portion of the rear seat inflatable portion of the airbag can be folded over the front portion. The rear seat inflatable portion is folded up and down so as to be stored in a state of being folded over the front portion, and the stored rear seat inflatable portion is provided on the peripheral portion of the roof head lining. While being covered I, it is characterized in that the rear end of the gas inlet has to be covered by the top of the quarter pillar garnish which is connected to the peripheral edge portion of the roof head lining.

In this case, the rear portion of the rear seat inflating portion is bent forward in the passenger compartment side and folded over to the front portion, and the rear seat inflating portion is vertically folded in a bellows shape. You may carry it out so that it is stored,
The rear part of the rear seat inflating part may be folded into the front part and folded over the front part. Further, a means for delaying gas introduction to the rear portion of the rear seat inflating portion may be provided and implemented.

Further, the rear seat inflating section is provided with a plurality of tubular expansion chambers extending substantially in the vertical direction, and the deflection of the tubular expansion chamber, which is the rear portion folded forward, is restrained from swinging in the vehicle width direction. You may implement by providing a suppression means. In this case, it is preferable that the shake suppressing means is a strap whose both ends are fixed to the non-inflatable portion across the tubular expansion chamber serving as the rear portion and the adjacent tubular expansion chamber.

[0009]

In the head protection airbag apparatus according to the present invention, gas is supplied from the inflator assembled to the quarter pillar into the airbag which is folded and stored through the gas introduction portion of the airbag. Then, the airbag deforms and deploys the peripheral portion of the roof head lining toward the vehicle interior, and inflates and deploys like a curtain at the side portion inside the vehicle interior. At this time, in the rear seat inflating portion of the airbag, the rear portion is deployed and inflated rearward after the front portion is deployed while the rear portion is folded over the front portion. Therefore, it is possible to smoothly deploy the inflatable part for the rear seat of the airbag without using a special shape in which the partition between the roof head lining and the quarter pillar garnish is greatly curved or a special structure is provided on the upper part of the quarter pillar garnish. You can

Further, in carrying out the present invention, the rear portion of the rear seat inflating portion of the airbag is bent forward in the passenger compartment side and folded over to the front portion, so that the rear seat inflating portion is vertically arranged. When it is folded and stored in a bellows shape, in addition to the above-described effects, the rear part of the inflatable part for the rear seats is located inside the passenger compartment at the initial stage of deployment, and the upper end of the quarter pillar garnish is located. It is possible to accurately prevent the portion from being caught.

Further, when the rear portion of the rear seat inflating portion of the airbag is folded into the front portion and folded back to the front portion, in addition to the above-described function and effect, the rear seat inflating portion is provided. At the initial stage of deployment, the rear part of the front part of the inflatable part for the rear seat can be properly expanded and prevented from catching on the upper end of the quarter pillar garnish because it does not project backward and is not projected rearward. As the rear part is pushed out and expands and expands,
It is possible to increase the deployment speed of the rear part.

When a means for delaying the introduction of gas to the rear portion of the rear seat inflating portion of the airbag is provided, the rear portion of the rear seat inflating portion is moved forward when the rear seat inflating portion is deployed. It is possible to surely delay the expansion of the rear seat inflating portion, and it is possible to more appropriately prevent the rear portion of the rear seat inflating portion from being caught by the upper end portion of the quarter pillar garnish.

Further, the rear seat inflating portion of the airbag is provided with a plurality of cylindrical expansion chambers extending substantially in the vertical direction, and the cylindrical expansion chambers, which are the rear portions folded forward, are swung in the vehicle width direction. In the case of providing the shake suppressing means for suppressing, the tubular expansion chamber, which is the rear portion of the rear seat inflating portion, is expanded in the vehicle width direction when the tubular expansion chamber, which is the front portion, is deployed after the expansion. Even if it tries, the shake is suppressed by the shake suppressing unit. Therefore, it is possible to rapidly deploy the tubular expansion chamber, which is the rear portion, between the vehicle body side portion and the side head portion of the rear seat occupant.

In this case, when the shake suppressing means is a strap whose both ends are fixed to the non-inflatable part across the tubular expansion chamber which is the rear part and the adjacent tubular expansion chamber, the rear part is When it is deployed and inflated rearward, the strap is pulled by the expansion of the adjacent tubular expansion chambers, and the shake of the rear portion in the vehicle width direction is suppressed. Therefore,
With a simple configuration in which only a strap is added, it is possible to effectively suppress the swinging of the rear portion in the vehicle width direction during deployment.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the first embodiment of the present invention.
An embodiment is shown and in this first embodiment,
The head protection airbag device 10 inflates and expands like a curtain on the side of the passenger compartment to protect the head Hf of the front occupant and the head Hr of the rear occupant, and the airbag 11. An inflator 12 for supplying gas to the vehicle, a tension belt 13 for tensioning the entire airbag 11, and the like are provided.

The airbag 11 has front and rear inflating portions 11b and 11c sandwiching the central non-inflatable portion 11a.
In addition to the above, a gas introducing portion 11d is provided at the upper rear portion, and a plurality of mounting pieces 11e are provided at the upper edge portion. As shown in FIG. 3, each airbag 11 includes an L-shaped plate 41, a bolt 42 and a nut 43, and a front pillar 21, a roof side rail 22, and a quarter pillar 23 of the vehicle body. It is assembled. The airbag 11 is stored along the front pillar 21, the roof side rail 22, and the quarter pillar 23 in a folded state, and is covered by the peripheral portions of the front pillar garnish 31, the roof headlining 32, and the quarter pillar garnish 33. It has become so. The L-shaped plate 41 is deployed in the space formed between the center pillar garnish 34 and the center pillar 24 and between the quarter pillar garnish 33 and the quarter pillar 23 by restricting the deployment direction of the airbag 11 to the vehicle interior side. Airbag 1 on the way
This is to prevent 1 from entering. Therefore, the L-shaped plate 41 is set only in a portion that overlaps the center pillar 24 and the quarter pillar 23.

Further, the airbag 11 is the inflator 1
2 has a gas inlet passage Pa having an opening connected to the front end portion at the rear end and extending obliquely downward toward the front,
An upper front seat expansion chamber Pb that communicates with the front end of the gas introduction passage Pa and extends rearward, and a lower front seat expansion portion Pc that communicates with the front end and the front of the middle portion of the gas introduction passage Pa and extends in the front-rear direction. And a pair of upper and lower rear seat expansion chambers Pd, Pe which communicate with the rear of the middle portion of the gas introduction path Pa and extend rearward.

The inflatable portion 11b for the front seat of the airbag 11 is
The front part of the gas introduction path Pa and a pair of upper and lower expansion chambers P for front seats
b, Pc. In addition, the airbag 1
The rear inflating section 11c for the rear seat 1 includes a rear portion of the gas introduction passage Pa and a pair of upper and lower rear expansion chambers Pd and Pe. An expansion chamber Pf is continuously formed in front of the upper front expansion chamber Pb, and the head H of the front seat occupant is formed.
The shock when f comes into contact with the front pillar 21 is reduced.

The inflator 12 is for ejecting gas toward the airbag 11 in the event of a side collision of the vehicle or the like. The inflator 12 is inclined along the quarter pillar 23 and is mounted on the bracket 12a provided at the center. The bolt 51 is used to assemble the quarter pillar 23, and the front end portion is fitted in the gas introduction portion 11d of the airbag 11 in an airtight manner. Further, the inflator 12 is covered with the quarter pillar garnish 33 together with the rear end portion of the gas introduction portion 11d of the airbag 11.

The tension belt 13 is made of a material that is easy to fold and does not extend easily. One end 13a of the tension belt 13 is fixed to a non-inflatable portion in the upper front portion of the airbag 11 by stitching, and an intermediate portion of the tension belt 13 in the lower front portion of the airbag 11 is fixed. It is movably inserted into a through hole (slit) 11f provided in the inflating portion, and the other end 13b is fixed to the lower portion of the front pillar 21 using a fixture (not shown) such as a bolt. Further, the tension belt 13 extends along the front edge of the front seat inflating portion 11b from one end 13a to a middle portion,
It is configured such that a predetermined tension is generated by the expansion deformation of the front seat inflating portion 11b (the belt length is set so that the predetermined tension is generated when the airbag 11 is inflated and deployed as shown in FIG. 1). ing. The tension belt 13
When the airbag 11 is stored along the front pillar 21, the roof side rail 22, and the quarter pillar 23 in a folded state, the front pillar 21
Stored along the front pillar garnish 31
Is covered by.

By the way, in the first embodiment,
A slit S is provided between the rear portion 11c1 of the rear seat inflating portion 11c and the gas introducing portion 11d in the airbag 11, and the rear portion 11c1 of the rear seat inflating portion 11c can be folded over the front portion 11c2. It is shaped. Further, in the state where the rear portion 11c1 of the rear seat inflating portion 11c is bent forward in the vehicle interior side and folded over to the front portion 11c2 (see the phantom line in FIG. 2), the rear seat inflating portion 11c is As shown in FIG. 3, the bellows are folded in the vertical direction and stored.

In the first embodiment constructed as described above, gas is ejected from the inflator 12 at the time of a side collision of the vehicle, and this gas is introduced into the gas introduction portion 1 of the airbag 11.
Airbag 11 folded and stored through 1d
When supplied into the vehicle, the airbag 11 deforms the front pillar garnish 31 and the peripheral portion of the roof head lining 32 toward the vehicle interior and deploys them (see the phantom line in FIG. 3), and at the side of the vehicle interior. Inflate and expand like a curtain.

At this time, the inflating portion 1 for the rear seat of the airbag 11
In 1c, the rear part 11c1 is the front part 11c2.
After the front portion 11c2 is deployed in the state of being folded over, the rear portion 11c1 is deployed rearward and inflated. Therefore, without dividing the roof headlining 32 and the quarter pillar garnish 33 into a special shape with a large curve or forming the upper portion of the quarter pillar garnish 33 into a special structure, the airbag 1
The rear seat inflating portion 11c can be smoothly deployed.

In the first embodiment, the rear portion 11 of the rear seat inflating portion 11c of the airbag 11 is also referred to.
The c1 is bent forward in the vehicle interior and the front portion 11
In the state of being folded on c2, the rear seat inflating portion 11c is vertically folded and stored in a bellows shape as shown in FIG. Therefore, the rear seat inflating portion 11c
The rear portion 11c1 thereof is located on the vehicle compartment side in the initial stage of the deployment, and it is possible to accurately suppress the catching on the upper end portion of the quarter pillar garnish 33.

When the airbag 11 inflates and deploys in a curtain shape as shown in FIG. 1, the tension belt 13
Tension is generated in the airbag 11, and the airbag 11 is pulled obliquely forward in the lower front portion of the airbag 11. A necessary and sufficient tension is generated in the lower front portion of the airbag 11.
The movement of b and 11c to the outside of the vehicle is suppressed.

In the first embodiment described above, FIGS.
As shown in FIG. 4, the rear portion 11c1 of the rear seat inflating portion 11c of the airbag 11 is bent forward in the vehicle interior side and folded over the front portion 11c2. As in the second embodiment, the slit S is also provided between the pair of upper and lower rear seat inflation chambers Pd and Pe so that the rear portion 11c1 of the rear seat inflation portion 11c of the airbag 11 is folded into the front portion 11c2. It is also possible to fold it over the front portion 11c2 (overlap by cactus folding).

In the second embodiment, since the rear portion 11c1 of the rear seat inflating portion 11c is located in the front portion 11c2 and does not protrude rearward as shown in FIG. 5, the quarter pillar garnish is provided. It is possible to accurately prevent the upper end portion of 33 from being caught. Further, as the front portion 11c2 of the rear seat inflating portion 11c is expanded and inflated, the rear portion 11c1 is pushed out and expanded and inflated as shown in FIG. 6, so that the expansion speed of the rear portion 11c1 can be increased. Is.

In the first embodiment, the rear seat inflating portion 11c of the airbag 11 is composed mainly of a pair of upper and lower rear seat inflation chambers Pd and Pe extending in the front-rear direction. As in the third embodiment shown in FIG. 7, by the three rear seat expansion chambers Pg, Ph, Pi, the rear seat expansion portions 11c mainly extending in the vertical direction and sequentially arranged in parallel in the front-rear direction and alternately communicating with each other. It can also be implemented as configured. In this third embodiment, the rear portion 11c1 of the rear seat inflation portion 11c (the portion forming the rear rear seat expansion chamber Pi) is the front portion 11c.
The slit S is formed in the same manner as in the first embodiment so that the slit S can be folded over at 2 (the portion where the central rear seat expansion chamber Ph is formed).
And a throttle (inflow delay means) 11g for delaying the gas introduction (see the phantom line in FIG. 7) to the rear rear-seat expansion chamber Pi is provided at the communication portion between the rear-seat expansion chambers Ph and Pi. ing.

In the third embodiment, the same operational effect as that of the above-described first embodiment can be obtained, and the rear portion 11c1 of the rear seat inflating portion 11c is surely delayed from the front portion 11c2 when it is deployed. Therefore, it is possible to more appropriately prevent the rear portion 11c1 of the rear seat inflating portion 11c from being caught by the upper end portion of the quarter pillar garnish 33.

In the third embodiment described above, the construction is carried out as shown in FIG. 7, but it is also possible to carry out the construction as shown in FIG. 8, FIG. 9 or FIG. . In the embodiment (first modification) shown in FIG. 8,
The rear seat inflating portion 11c of the airbag 11 communicates with a pair of upper and lower rear seat inflating chambers Pj, Pk extending mainly in the front-rear direction and a rear end of the lower rear seat inflating chamber Pk, and extends rearwardly to extend rearwardly. It is constituted by a seat expansion chamber Pm. Further, the rear part 11c1 (the part forming the rear rear seat expansion chamber Pm) of the rear seat inflating part 11c is folded over to the front part 11c2 (the part behind the part forming the rear seat expansion chambers Pj, Pk). As is the case with the first embodiment, the slit S
Is provided. Further, as an inflow delay means for delaying the gas introduction (see the phantom line in FIG. 8) to the rear rear-seat expansion chamber Pm, the upper rear-seat expansion chamber Pj and the lower rear-seat for the rear-seat expansion chamber Pj are provided from the gas introduction path Pa. A long flow path is used to reach the rear rear seat expansion chamber Pm through the expansion chamber Pk. For this reason,
Also in this embodiment, the same effect as that of the third embodiment can be obtained.

In the embodiment (second modified example) shown in FIG. 9, three rear seat inflatable portions 11c for the rear seats of the airbag 11 extend mainly in the vertical direction and are arranged in parallel in the front-rear direction. The expansion chambers Pn, Po, Pp are configured. Further, the rear portion 11c1 of the rear seat inflation portion 11c (the portion forming the rear rear seat inflation chamber Pp) is the front portion 11
c2 (a part where the central rear seat expansion chamber Po is formed) is folded so as to be folded over the front part 11c2.
The rear portion 11c1 of the rear seat inflating portion 11c and the gas introducing portion 1
The slit S is formed between 1d, and there is no partition between the rear seat expansion chambers Po and Pp. Further, as an inflow delay means for delaying gas introduction into the rear rear expansion chamber Pp (see the phantom line in FIG. 9), the front rear expansion chamber Pn from the gas introduction path Pa and the central rear seat Pn are introduced. A long flow path is used to reach the rear rear seat expansion chamber Pp through the expansion chamber Po. Therefore, also in this embodiment, the same operational effect as that of the third embodiment can be obtained.

In the embodiment (third modified example) shown in FIG. 10, the rear seat inflating portion 11c of the airbag 11 is mainly composed of the front rear seat expanding chamber Pq and the rear rear seat expanding chamber Pr.
The gas is supplied from the gas introduction path Pa to the front portion of the front rear-seat expansion chamber Pq through the branch flow path Ps. In addition, the rear seat inflating section 1
The rear portion 11c1 of 1c (the portion forming the rear rear-seat expansion chamber Pr) is folded into the front portion 11c2 (the portion forming the front rear-seat expansion chamber Pq) to form the front portion 11c.
A slit S is formed between the rear portion 11c1 of the rear seat inflating portion 11c and the gas introducing portion 11d so that the rear seat inflating portion 11c can be folded into two, and there is no partition between the rear seat inflating chambers Pq and Pr. ing. Furthermore, the rear expansion chamber P for the rear seats
As the inflow delay means for delaying the gas introduction into r (see the phantom line in FIG. 10), the gas introduction passage Pa to the branch passage P
s and a long flow path from the front rear seat expansion chamber Pq to the rear rear seat expansion chamber Pr. Therefore, also in this embodiment, the same operational effect as that of the third embodiment can be obtained.

In the third embodiment, as shown in FIG. 7, the rear seat inflating portion 11c of the airbag 11 is mainly composed of three rear seat inflating chambers Pg, Ph, Pi. However, as in the fourth embodiment shown in FIGS. 11 to 14, the rear-seat inflatable portion 11c of the airbag 11 has three tubular inflation chambers Pt, which extend substantially vertically.
It is also possible to implement as a configuration including Pu and Pv.

The airbag 11 of the fourth embodiment is provided with a gas introducing portion 11d at the upper rear portion as in the above-mentioned embodiment, and a gas introducing passage extending linearly from the gas introducing portion 11d toward the front of the vehicle along the upper edge portion. It has Pa. Rear seat inflating section 11
Expansion chambers Pt and Pu located in the front and center of c
Communicates with the gas introduction path Pa at the top. The expansion chamber Pv located at the rear of the rear seat expansion section 11c is
The lower part communicates with the central expansion chamber Pu through the passage Pw.

A rear portion 11c1 (expansion chamber P) is provided between the rear portion 11c1 of the rear seat inflating portion 11c and the gas introducing portion 11d.
A slit S is provided so that the portion where v is formed) can be folded over the front portion 11c2 (where the expansion chamber Pu is formed). The slit S reaches a non-expansion portion between the rear expansion chamber Pv and the central expansion chamber Pu. In addition, the rear expansion chamber Pv
A notch N is provided upward at the lower edge of the non-expansion part between the central expansion chamber Pu and the central expansion chamber Pu, and the rear seat expansion part 11c is formed.
The rear part 11c1 of the above can be easily folded on the front part 11c2.

The airbag 11 of the fourth embodiment described above is folded as follows. First, the rear portion 11c1 of the rear seat inflating portion 11c is bent forward toward the outside of the vehicle compartment,
Fold over the front part 11c2. Next, the rear seat inflating section 1
1c is folded up and down like a bellows. Therefore, when the inflator 12 operates, the gas ejected from the inflator 12 is supplied from the gas introduction path Pa to the central expansion chamber Pu and the front expansion chamber Pt, and the front portion 11c2 of the rear seat inflating portion 11c expands downward. To do. The gas supplied to the central expansion chamber Pu flows into the rear expansion chamber Pv from the lower passage Pw, and expands the rear part 11c1 of the rear seat expansion part 11c to the vehicle rear side after the expansion of the front part 11c2.

At this time, the rear portion 1 of the rear seat inflating portion 11c
It is conceivable that 1c1 tends to swing (pivot) in the vehicle width direction around the non-expansion portion between the central expansion chamber Pu and the rear expansion chamber Pv. Therefore, in the present embodiment, the strap 14 (illustration is omitted in FIG. 11) as a shake suppressing means for suppressing the shake in the vehicle width direction of the rear expansion chamber Pv, which is the rear portion 11c1 of the rear seat inflating portion 11c. )
Is provided. In the first and second embodiments described above, the rear seat inflating portion 11 of the airbag 11 is used.
Since c is mainly composed of a pair of upper and lower rear seat expansion chambers Pd and Pe extending in the front-rear direction, the rear portion 11c1 of the rear seat expansion portion 11c does not swing in the vehicle width direction when deployed.

As shown in FIGS. 12 to 14, the strap 14 is located at the non-expansion portion located in front of the central expansion chamber Pu at one end and behind the rear expansion chamber Pv at the other end. Are fixed to the non-expandable portions. In other words, the strap 14 includes the central expansion chamber Pu and the rear expansion chamber Pv.
Both ends are fixed to the front and rear non-inflatable parts across the and. The strap 14 is preferably fixed to the non-inflatable portion by sewing or bonding. Further, it is preferable to provide the strap 14 on the outer surface of the airbag 11 on the vehicle interior side, since it is possible to avoid contact with the head of the occupant.

In the above-described fourth embodiment, the three expansion chambers Pt, Pt,
When Pu and Pv expand into a tubular shape as shown in FIG. 14,
The front-rear length of the rear expansion chamber 11c is shortened. However, both ends of the strap 14 are fixed to the front and rear non-inflatable portions straddling the central and rear expansion chambers Pu and Pv, and the strap 14 is pulled by the expansion of the central and rear expansion chambers Pu and Pv. As a result, even if the three expansion chambers Pt, Pu, Pv expand into a tubular shape, the strap 14 is taut,
It is possible to effectively prevent the folded back portion 11c1 from swinging in the vehicle width direction.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a side view showing a state where the airbag and the tension belt shown in FIG. 1 are deployed.

3 is a cross-sectional view taken along line 3-3 of FIG. 1 in a state in which the airbag shown in FIG. 1 is stored.

FIG. 4 is a side view of an essential part showing a second embodiment of the present invention.

5 is a cross-sectional plan view of the AA line portion and the BB line portion of FIG. 4 in the initial stage of the expansion of the rear seat inflating portion in the airbag shown in FIG.

FIG. 6 is a cross-sectional plan view when the rear seat inflating section shown in FIG. 5 is inflated and deployed.

FIG. 7 is a side view of an essential part showing a third embodiment of the present invention.

8 is a view corresponding to FIG. 7 and showing a first modification of the third embodiment shown in FIG.

9 is a diagram corresponding to FIG. 7 showing a second modification of the third embodiment shown in FIG. 7.

FIG. 10 is a view, corresponding to FIG. 7, showing a third modification of the third embodiment shown in FIG. 7.

FIG. 11 is a side view of a main part (a side view seen from the vehicle compartment side) showing a fourth embodiment of the present invention.

FIG. 12 is a side view of the airbag shown in FIG. 11 in a deployed state.

13 is a cross-sectional view of the airbag along the strap of FIG.

FIG. 14 is a diagram when the portion shown in FIG. 13 is inflated.

[Explanation of symbols]

10 ... Head protection airbag device, 11 ... Airbag, 1
1a ... central non-inflatable portion, 11b ... front seat inflating portion, 11c ...
Rear seat inflatable portion, 11c1 ... Rear part of rear seat inflatable portion, 1
1c2 ... Front part of expansion part for rear seat, 11d ... Gas introduction part, Pa ... Gas introduction path, Pb, Pc, Pd, Pe, P
f, Pg, Ph, Pi, Pj, Pk, Pm, Pn, P
o, Pp, Pq, Pr, Pt, Pu, Pv ... Expansion chamber, P
s ... Branch flow path, 12 ... Inflator, 14 ... Strap, 21 ... Front pillar, 22 ... Roof side rail, 23 ... Quarter pillar, 31 ... Front pillar garnish, 32 ... Roof head lining, 33 ... Quarter pillar garnish.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-11-235965 (JP, A) JP-A-10-338099 (JP, A) JP-A-11-208410 (JP, A) JP-A-11- 222093 (JP, A) JP 11-70848 (JP, A) JP 10-119703 (JP, A) JP 11-48902 (JP, A) JP 2002-503581 (JP, A) (JP, A) 58) Fields investigated (Int.Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (6)

(57) [Claims] 1. An airbag that inflates and deploys like a curtain on a side portion in a vehicle compartment is provided with a rear seat inflating portion and a gas introducing portion at a rear portion thereof and is assembled along at least a quarter pillar and a side rail of a vehicle body. A head protection airbag device in which the gas introducing portion projects rearward above the rear seat inflating portion and is connected to an inflator assembled to the quarter pillar, wherein the rear seat in the airbag The rear portion of the rear seat inflatable portion is formed into a shape that can be folded over the front portion, and the rear seat inflatable portion is vertically folded with the rear portion of the rear seat inflatable portion folded in the front portion. The rear seat inflating portion thus stored is covered with the peripheral portion of the roof head lining, and the rear end portion of the gas introducing portion is covered with the roof head lining. A head protection airbag device, characterized in that it is covered by an upper portion of a quarter pillar garnish connected to a peripheral portion of the steering wheel. 2. A rear portion of the rear seat inflating portion is bent forward in the vehicle interior side and folded back to a front portion, and the rear seat inflating portion is vertically folded in a bellows shape for storage. The head protection airbag apparatus according to claim 1, wherein the head protection airbag apparatus is provided. 3. The head protection airbag apparatus according to claim 1, wherein the rear portion of the rear seat inflating portion is folded into the front portion and is folded on the front portion. 4. The head protection airbag apparatus according to claim 1, further comprising means for delaying gas introduction to a rear portion of the rear seat inflating portion. 5. The rear seat inflating section includes a plurality of tubular expansion chambers extending substantially vertically, and prevents the tubular expansion chamber, which is a rear portion folded forward, from swinging in the vehicle width direction. The head protection airbag apparatus according to claim 1, further comprising a shake suppressing means for controlling the vibration. 6. The sway suppressing means is a strap having both ends fixed to a non-inflatable portion across a tubular expansion chamber serving as the rear portion and an adjacent tubular expansion chamber. 5. The head protection airbag device according to item 5.