JP2009023493A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device capable of quickly lowering internal pressure of at least one of a plurality of chambers after quickly inflating the chamber. <P>SOLUTION: This side airbag device 20 is provided with an airbag 22 including an outer bag 31 and inner bags 41 and 42 stored in the outer bag 31 and fixed to an inner wall of the outer bag 31, and an inflator for injecting gas to the inside of the inner bags 41 and 42 according to impact added to a vehicle. The inner bags 41 and 42 are inflated by the gas from the inflator to bring mutual outer walls into close contact with each other, and thereby a bulkhead for dividing the inside of the outer bag 31 into a waist chamber 51 and a chest chamber 52 is formed. The gas in the inner bags 41 and 42 is supplied to the inside of the waist chamber 51 through communication holes 41a and 42a formed in the inner bags 41 and 42. Based on a rise of the internal pressure of the waist chamber 51 to which the gas is supplied, the outer walls in close contact with each other are separated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an airbag device that protects an occupant from the impact by inflating the airbag between the occupant and the inner wall of the vehicle when an impact is applied to the vehicle.

  As such an airbag device, for example, a side airbag device is known that protects an occupant from an impact on an area extending from the waist to the chest of the occupant when an impact is applied from the side of the vehicle. Usually, in such a side airbag device, an inflator capable of ejecting gas and an airbag capable of being inflated by the gas of the inflator are provided. In the space between the occupant seated on the vehicle seat and the inner wall of the vehicle, the inflator blows gas into the airbag when an impact of a predetermined level or more is applied to the body side of the vehicle from the side. The airbag is inflated from the seat back toward the front. By inflating the airbag in this way, the impact from the side transmitted to the occupant through the body side portion can be mitigated.

  Here, due to the structural characteristics of the body side portion of the vehicle, usually, when an impact is applied from the side of the vehicle, the waist is often subjected to an impact from the inner wall earlier than the chest of the occupant. For this reason, it is desirable to immediately restrain the occupant's waist by inflating the airbag with a high internal pressure immediately after an impact is applied from the side of the vehicle. On the other hand, generally, with respect to the impact resistance of the human body side, the waist is superior to the chest, and therefore the internal pressure of the portion corresponding to the passenger's chest of the airbag is preferably smaller than the waist.

Therefore, for example, as described in Patent Document 1, a side airbag device is proposed in which an airbag is partitioned into a chest chamber corresponding to the chest of an occupant and a waist chamber corresponding to the waist. Specifically, this side airbag device is provided with gas distribution devices that open to the chest chamber and the waist chamber, respectively, and this gas distribution device is subjected to an impact from the side of the vehicle. Sometimes, more gas is expelled by the inflator and introduced into the lumbar chamber than the chest chamber. This allows the chest chamber to expand at a relatively low internal pressure near the side of the occupant's chest while the waist chamber expands relatively early at a relatively high internal pressure near the side of the occupant's waist. Become.
Japanese Patent Laid-Open No. 2004-210048

  By the way, in order to protect the occupant's lumbar region more effectively, as described above, the lumbar region corresponding to the lumbar region is inflated with a high internal pressure to temporarily restrain the occupant's lumbar region, and then the internal pressure of the lumbar region chamber is reduced. It is desirable. Accordingly, in order to reduce the internal pressure of the waist chamber after the waist chamber has been inflated with a high pressure, for example, the following side airbag device can be employed. That is, in this side airbag device, an airbag partitioned into a chest chamber and a waist chamber and an inflator for injecting gas into the waist chamber are provided, and the chest chamber and the waist chamber communicate with each other. It is communicated by a hole. With such a side airbag, immediately after an impact is applied from the side of the vehicle, gas is ejected into the waist chamber by the inflator, and the waist chamber is preferentially inflated. Here, the gas ejected into the lumbar chamber flows into the chest chamber through the communication hole, but the amount of gas ejected by the inflator in the early stage of gas generation by the inflator passes from the lumbar chamber through the communication hole to the chest chamber. Since it is larger than the amount of gas flowing in, the waist chamber expands quickly with a high internal pressure. When the amount of gas ejected by the inflator in the later stage of gas generation by the inflator becomes smaller than the amount of gas flowing from the same waist chamber through the communication hole into the chest chamber, the internal pressure of the waist chamber decreases. Further, the gas supplied to the chest chamber through the communication hole expands the chest chamber with an internal pressure lower than that of the waist chamber, thereby protecting the chest of the occupant.

  In this way, by adopting a structure in which the chest chamber and the lumbar chamber communicate with each other through the communication hole, immediately after the impact is applied, the lumbar chamber is inflated with a high internal pressure to quickly restrain the occupant's waist, The internal pressure of the lumbar chamber can be reduced, and the occupant's lumbar region can be more effectively protected. However, in order to efficiently reduce the internal pressure of the waist chamber after the waist chamber is expanded with a high internal pressure, it is necessary to set the cross-sectional area of the communication hole large. However, if the cross-sectional area of the communication hole is set large, the amount of gas flowing from the waist chamber through the communication hole into the chest chamber when the waist chamber expands immediately after an impact is applied becomes relatively large. Therefore, in this case, although the internal pressure of the lumbar chamber can be suppressed from becoming excessively high, the lumbar chamber cannot be rapidly expanded with a high internal pressure. For this reason, in such a side airbag device, there is still room for improvement in that the lumbar part of the occupant is quickly restrained and then the pressure in the lumbar part chamber is quickly reduced.

  Although the vehicle side airbag device has been described, such inconvenience is not limited to the same configuration, and at least one of a plurality of chambers provided corresponding to different parts of the occupant is quickly inflated, and then The air bag apparatus that lowers the internal pressure can be generated almost in common.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an airbag device capable of quickly reducing its internal pressure after rapidly inflating at least one of a plurality of chambers. There is.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
According to a first aspect of the present invention, there is provided an airbag including an outer bag, a pair of inner bags housed in the outer bag and fixed to an inner wall of the outer bag, and the pair according to an impact applied to the vehicle. An inflator for injecting gas into the inner bag, wherein the pair of inner bags are inflated by the gas injected by the inflator and brought into close contact with the outer walls of the outer bag. Forming a partition partitioning the interior into a plurality of chambers, and supplying gas in the inner bag to the chambers excluding at least one of the plurality of chambers through a communication hole formed in the inner bag; The close outer wall is separated based on an increase in the internal pressure of the supplied chamber. The gist.

  According to this configuration, immediately after an impact is applied to the vehicle, the outer walls of the pair of inner bags are brought into close contact with each other to form a partition that divides the interior of the outer bag into a plurality of chambers. Since the gas to be ejected is supplied to the chambers except for at least one of the plurality of chambers through the communication hole formed in the inner bag, the chamber to which the gas is supplied can be rapidly expanded at a high internal pressure. become. Then, the close outer walls of the pair of inner bags are separated from each other based on the increase in the internal pressure of the chamber supplied with gas, and the gas in the chamber supplied with gas passes through the gap between the outer walls. It becomes possible to flow into the chamber that has not been supplied. As a result, it is possible to quickly reduce the internal pressure after at least one of the plurality of chambers of the airbag is rapidly inflated.

  According to a second aspect of the present invention, in the airbag device according to the first aspect, the pair of inner bags are respectively fixed to two opposing inner walls of the outer bag and inflated by the gas ejected by the inflator. The gist of this is to present a pipe shape extending in a parallel direction.

  According to this configuration, by adopting an inner bag that is fixed to two opposing inner walls of the outer bag and that extends in a parallel direction when inflated, a pair of inner bags is applied when an impact is applied to the vehicle. Since the inner bag expands in opposition, the inside of the outer bag can be partitioned quickly and reliably.

The gist of the invention according to claim 3 is that, in the airbag device according to claim 2, the internal spaces of the pair of inner bags are communicated with each other.
According to this configuration, the internal spaces of the pair of inner bags communicate with each other, so that gas can be simultaneously introduced into the inner bags through one inflator. Thereby, for example, a pair of inner bags are isolated, and the airbag device can be reduced in size and simplified as compared with the case where gas is separately introduced into the inner bags through two inflators.

  According to a fourth aspect of the present invention, in the airbag device according to any one of the first to third aspects, the gas in the inner bag is supplied when a lateral impact is applied to the vehicle. The chamber is inflated between the occupant's waist and the inner wall of the vehicle, while the chamber to which the gas in the inner bag is not supplied is inflated between the chest of the occupant and the inner wall of the vehicle.

  Due to the structural characteristics of the body side portion of the vehicle, usually, when an impact is applied from the side of the vehicle, the waist is often subjected to an impact from the inner wall earlier than the occupant's chest. For this reason, it is desirable to immediately restrain the occupant's waist by inflating the airbag with a high internal pressure immediately after an impact is applied from the side of the vehicle. On the other hand, in general, with respect to the impact resistance of the human body side, the waist is superior to the chest, and therefore the internal pressure of the portion corresponding to the passenger's chest of the airbag is preferably smaller than the waist. In order to protect the occupant's waist more effectively, as described above, the lumbar chamber corresponding to the lumbar is inflated with a high internal pressure to temporarily restrain the occupant's waist, and then the internal pressure of the lumbar chamber is reduced. It is desirable.

  In this regard, according to the above-described configuration, immediately after an impact is applied from the side of the vehicle, the gas in the inner bag is supplied to the chamber corresponding to the occupant's waist and is quickly inflated with a high internal pressure to temporarily restrain the waist. Thereafter, the gas in the chamber corresponding to the waist is quickly introduced into the chamber corresponding to the chest of the occupant through the outer walls of the pair of inner bags. Therefore, since the internal pressure of the chamber corresponding to the lumbar portion is quickly reduced, the occupant's lumbar portion can be more effectively protected. In addition, the gas supplied to the chamber corresponding to the chest from the chamber corresponding to the waist through the communication hole expands the chamber corresponding to the chest with a lower internal pressure than the chamber corresponding to the waist, thereby protecting the chest of the occupant. Can do.

The gist of the invention according to claim 5 is that, in the airbag device according to claim 4, the pair of inner bags is inflated between the occupant's waist and the inner side wall of the vehicle.
According to this configuration, the pair of inner bags is inflated between the occupant's waist and the inner wall of the vehicle, in other words, the occupant's waist is protected by the inner bag that inflates earlier than the chamber corresponding to the waist. Therefore, it is possible to restrain the occupant's lumbar part earlier after an impact is applied from the side of the vehicle as compared with the case where the occupant's lumbar part is protected only by the chamber corresponding to the lumbar part.

  According to the airbag device of the present invention, it is possible to quickly reduce the internal pressure after rapidly inflating at least one of the plurality of chambers.

Hereinafter, an embodiment in which the present invention is applied to a vehicle side airbag device will be described with reference to FIGS.
In the following description, the forward direction of the vehicle will be described as the front (front of the vehicle), and the reverse direction of the vehicle will be described as the rear (rear of the vehicle). Further, in the following description, the vertical direction means the vertical direction of the vehicle, and the horizontal direction is the vehicle width direction of the vehicle and coincides with the horizontal direction when the vehicle moves forward.

  As shown in FIGS. 1 and 2, a vehicle seat 12 is disposed in the vicinity of the vehicle side of the body side portion 11 in the vehicle. Here, the body side portion 11 refers to a member disposed on a side portion of the vehicle, and mainly includes a door, a pillar, and the like, and a portion facing the passenger compartment is an inner wall of the vehicle. For example, the body side part 11 corresponding to the front seat is a front door, a center pillar (B pillar), or the like. The body side portion 11 corresponding to the rear seat is a rear portion of a side door (rear door), a C pillar, a front portion of a tire house, a rear quarter, and the like.

  The vehicle seat 12 includes a seat cushion (seat portion) 13 and a seat back (backrest portion) 14. A side airbag device 20 that protects the occupant P from the impact in the region including the waist Ps to the chest Pt of the occupant P when an impact is applied from the side of the vehicle is incorporated in the side portion of the seatback 14 on the vehicle outer side. It is. The side airbag device 20 includes an inflator 21 and an airbag 22 as main components. Next, the configuration of the side airbag device 20 will be described in detail with reference to FIGS. 3 is a developed perspective view showing a sewing manner of the airbag 22, and FIG. 4 is a front view showing a manner of the side airbag device 20 after the airbag 22 is sewn. 5 is a cross-sectional view showing a cross section taken along line 5-5 of FIG.

  As shown in FIG. 3, in the airbag 22, the outer base fabric 30 constituted by a pair of overlapping portions 30 a and 30 b that are symmetric with respect to the center line L, and the center before being folded in half. A substantially cross-shaped inner base fabric 40 that is symmetric with respect to both the line L and the center line N perpendicular to the center line L is provided. The outer base fabric 30 and the inner base fabric 40 are formed of a material having high strength and flexibility and can be easily folded, for example, a woven fabric formed using a polyester or a polyamide. Has been.

  The substantially cross-shaped inner base fabric 40 is folded in half at the center line N to form substantially T-shaped overlapping portions 40a and 40b, and the outer peripheral portions thereof are overlapped and sewn to the outer base fabric 30 with the sewing thread 401. . As a result, pipe-like inner bags 41 and 42 (with the center line L as a boundary) having the overlapping portions 40a and 40b as outer walls and the storage portion 43 are formed, and the inner bags 41 and 42 and the interior of the storage portion 43 are formed. The spaces are in communication with each other. The inner bags 41 and 42 are formed with communication holes 41a and 42a that communicate with the inside and the outside, respectively.

  As shown in FIG. 4, the inflator 21 that functions as a gas generator is accommodated in the accommodating portion 43, and the inflator 21 and the inflator 21 are accommodated by a locking member (not shown) provided on the inner wall of the accommodating portion 43. The relative displacement with the inner wall of the portion 43 is restricted. Further, the end 43 a of the storage portion 43 opposite to the inner bags 41 and 42 is attached to the external base fabric 30 with a sewing thread 401 and closed. An impact sensor (not shown) is connected to the inflator 21, and when an impact of a predetermined value or more is applied to the body side part due to a side collision by another vehicle with respect to the body side part of the vehicle, the impact sensor detects it. The ignition signal is output to the inflator 21, and the inflator 21 generates gas based on the ignition signal. Further, an outlet 21a for ejecting the generated gas is provided at the end of the inflator 21 on the inner bag 41, 42 side, and this outlet 21a faces the connecting portion of the inner bags 41, 42. It is open.

  As shown in FIGS. 4 and 5, the outer base fabric 30 is folded in half at the center line L to form overlapping portions 30 a and 30 b, and the outer peripheral portions thereof are sewn together with a sewing thread 301, thereby overlapping An outer bag 31 having outer portions of the portions 30a and 30b is formed. In addition, the inner base fabric 40 sewn on the outer base fabric 30 is folded in two along the center line L together with the outer base fabric 30, and the two inner bags 41 and 42 are two inner walls facing the outer bag 31, that is, polymerization. It is fixed to the portions 30a and 30b and extends along directions parallel to each other. The end portions 41 b and 42 b of these inner bags 41 and 42 are sewn and closed between the overlapping portions 30 a and 30 b with a sewing thread 301.

  Here, in a state where the airbag 22 has been inflated between the occupant P and the vehicle body side portion 11, the inner bags 41 and 42 extend in the front-rear direction, and the storage portion 43 extends in the vertical direction for storage. The spout 21a of the inflator 21 housed in the portion 43 opens downward. In a state where the airbag 22 has been inflated, a portion below the sewing thread 401 of the airbag 22 is located between the waist portion Ps of the occupant P and the body side portion 11 of the vehicle. The portion above the sewing thread 401 is located between the chest Pt of the occupant P and the body side portion 11 of the vehicle.

Hereinafter, an aspect in which the side airbag device 20 is inflated by an impact from the side of the vehicle will be described in detail with reference to FIGS.
FIG. 6 shows a cross-sectional aspect of the airbag 22 immediately after an impact of a predetermined value or more is applied from the side of the vehicle. As shown in FIGS. 4 and 6, the gas generated by the inflator 21 immediately after an impact of a predetermined value or more is applied to the vehicle from the outlet 21a along the direction indicated by the arrow A1. , 42 and the inner bags 41, 42 are rapidly inflated from the seat back toward the front, and their outer walls come into close contact with each other. Thus, the inside of the outer bag 31 is partitioned into a waist chamber 51 corresponding to the waist Ps of the occupant P and a chest chamber 52 corresponding to the chest Pt of the occupant P, and the gas ejected to the inner bags 41 and 42 is the inner gas. It is introduced only into the waist chamber 51 along the direction indicated by the arrow A2 through the communication holes 41a and 42a formed in the bags 41 and 42. For this reason, the lumbar chamber 51 is rapidly expanded at a high internal pressure. Thus, the inner bags 41 and 42 and the lumbar chamber 51 that have been inflated immediately after an impact is applied from the side of the vehicle once restrains the lumbar Ps of the occupant P with a relatively high internal pressure.

  Since the gas in the inner bags 41 and 42 is introduced only into the waist chamber 51 in this way, the internal pressure of the waist chamber 51 rises, while the internal pressure of the chest chamber 52 does not rise. The difference in internal pressure increases. Here, when the difference in internal pressure between the waist chamber 51 and the chest chamber 52 becomes larger than a predetermined value, the outer walls of the inner bags 41 and 42 are separated by the internal pressure difference between the chambers 51 and 52 as shown in FIG. And a gap 60 is formed between the outer walls. When such a gap 60 is formed, the gas in the lumbar chamber 51 flows into the chest chamber 52 through which the gas is not supplied along the direction indicated by the arrow A3 through the gap 60 and restrains the lumbar Ps of the occupant P. The internal pressure of the lumbar chamber 51 decreases, while the internal pressure of the chest chamber 52 increases. The chest chamber 52 in which the internal pressure has thus increased restrains the chest Pt of the occupant P.

  When the gas ejected by the inflator 21 is weakened, as shown in FIG. 8, the internal pressure of the inner bags 41 and 42 decreases, and the gap 60 between the outer walls of the inner bags 41 and 42 increases. . When the gap 60 increases in this way, the rate at which the gas in the lumbar chamber 51 flows into the chest chamber 52 significantly increases, and the lowering of the internal pressure in the lumbar chamber 51 is further promoted.

  In the present embodiment, the ejection amount of the inflator 21, the dimensions of the outer bag 31 and the inner bags 41, 42, and the dimensions of the communication holes 41a, 42a are set so as to satisfy the following conditions.

  The inner bags 41 and 42 and the waist chamber 51 are inflated before the waist Ps of the occupant P comes into contact with the body side part 11 after an impact is applied to the side of the vehicle, thereby effectively restraining the waist Ps.

  Thereafter, the gas introduced into the chest chamber 52 through the gap 60 causes the chest chamber 52 to expand and effectively restrain the chest with appropriate internal pressure before the chest Pt of the occupant P contacts the body side portion 11. At the same time, the internal pressures of the inner bags 41 and 42 and the waist chamber 51 are reduced to a predetermined pressure or less within a predetermined time.

According to the embodiment described above, the following effects can be obtained.
(1) Immediately after an impact of a predetermined value or more is applied to the body side portion 11, the inner walls of the inner bags 41 and 42 come into close contact with each other to partition the inside of the outer bag 31 into a waist chamber 51 and a chest chamber 52. A partition wall was formed, and the gas ejected into the inner bags 41 and 42 by the inflator 21 was supplied only to the waist chamber 51. As a result, the waist chamber 51 to which the gas is supplied can be rapidly expanded with a high internal pressure. Then, based on the increase in the internal pressure of the waist chamber 51 to which the gas is supplied, the outer walls in close contact of the inner bags 41 and 42 are separated from each other, and the gas in the waist chamber 51 to which the gas is supplied becomes a gap 60 between the outer walls. Through the chest chamber 52 which has not been supplied with gas. As a result, the internal pressure of the waist chamber 51 can be reduced early.

  Further, when the gas ejected by the inflator 21 is weakened, the inner pressure of the inner bags 41 and 42 is reduced, and the gap 60 is increased. When the gap 60 is increased in this way, the speed or amount of the gas in the waist chamber 51 flowing into the chest chamber 52 is remarkably increased, and the decrease in the internal pressure of the waist chamber 51 is further promoted. That is, by adopting a configuration in which the gap 60 between the outer walls of the inner bags 41 and 42, in other words, the cross-sectional area of the communication path between the waist chamber 51 and the chest chamber 52 increases with time, For example, as compared with the case where the cross-sectional area of the communication path that communicates the lumbar chamber 51 and the chest chamber 52 is constant, the inner pressure can be lowered early after the lumbar chamber 51 is rapidly expanded. .

  Therefore, the waist part Ps of the passenger P can be protected more effectively. Further, the gas supplied from the waist chamber 51 to the chest chamber 52 through the communication holes 41a and 42a causes the chest chamber 52 to expand with an internal pressure lower than that of the waist chamber 51, and thus the chest Pt of the occupant P can be appropriately protected. .

  (2) Since the inner bags 41 and 42 are fixed to the two inner walls facing the outer bag 31, that is, the overlapping portions 30a and 30b and extend along directions parallel to each other, an impact is applied from the side of the vehicle. Since the inner bags 41 and 42 sometimes inflate oppositely, the waist chamber 51 and the chest chamber 52 can be partitioned quickly and reliably.

  (3) Since the inner spaces of the inner bags 41 and 42 and the storage portion 43 of the inflator 21 are communicated with each other, gas can be simultaneously introduced into the inner bags 41 and 42 through one inflator 21. Thereby, for example, a pair of inner bags are isolated, and the side airbag device 20 can be reduced in size and simplified as compared with a case where gas is separately introduced into the inner bags through two inflators. Become.

  (4) The inner bags 41 and 42 are inflated between the waist part Ps of the occupant P and the body side part 11. Thereby, since it is also possible to protect the occupant's P waist part Ps by the inner bag 41, 42 that expands earlier than the chest chamber 52, compared to the case where the occupant P waist part Ps is protected only by the lumbar chamber 51, The lumbar Ps of the occupant P can be restrained earlier.

In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
In the above embodiment, the inner bag 41, 42 and the lumbar chamber 51 are used to protect the lumbar portion Ps of the occupant P. For example, when the lumbar chamber 51 has a sufficiently high inflation rate, the lumbar region A configuration in which the waist Ps is protected only by the chamber 51 may be employed.

  In the above embodiment, the inner spaces of the inner bags 41 and 42 are communicated with each other, and gas is simultaneously introduced into the inner bags 41 and 42 through one inflator 21. When it is difficult to dispose the inner bags 41 and 42 communicated with each other, it is possible to employ two inner bags that are isolated from each other.

  In the above embodiment, the inner bag 41, 42 is fixed to the two opposing inner walls of the outer bag 31, but the outer walls are in close contact with each other when the two inner bags are inflated. If there is, the position which fixes inner bag 41 and 42 is not restricted to this. For example, two inner bags can be fixed to two adjacent inner walls, or two inner bags can be fixed to the same inner wall.

  In the above-described embodiment, the case where the present invention is applied to the side airbag device 20 is illustrated, but the present invention is not limited to this. For example, when an impact is applied from the front of the vehicle, The present invention can also be applied to other airbag devices such as a driver airbag device that protects the vehicle. When the present invention is applied to an airbag device that protects the chest and head of an occupant, the pair of inner bags is inflated so that the outer bag is a chest chamber corresponding to the chest and the head corresponding to the head. It is possible to adopt a configuration in which a communication hole that is partitioned into a partial chamber and is formed on the outer wall of the inner bag to communicate the inner bag and the chest chamber is formed. With such a configuration, immediately after the impact is applied from the front of the vehicle, the chest chamber can be quickly expanded to quickly restrain the chest that receives the steering impact earlier than the head. Thereafter, by introducing gas from the chest chamber into the head chamber, the head of the occupant can be protected, and the chest chamber can be more effectively protected by lowering the chest chamber early.

  In the above embodiment, the present invention is not limited to the case where the present invention is applied to the airbag apparatus that partitions the outer bag into two chambers corresponding to two parts of the occupant by bringing the outer wall of the inner bag into close contact, for example, The present invention can be basically applied to an airbag device for protecting three or more parts of passengers having different impact resistances in the same manner. In that case, the inner bag forms a partition partitioning the inside of the outer bag into a plurality of chambers by bringing the outer walls into close contact with each other, and at least one of the plurality of chambers through the communication hole formed in the inner bag. The gas in the inner bag may be supplied into the chamber except for and the closely spaced outer walls may be separated based on the increase in the internal pressure of the chamber supplied with the gas.

In one Embodiment which actualized this invention, the schematic side view of the vehicle seat to which a side airbag apparatus is applied. The schematic plan view explaining the positional relationship of the vehicle seat and body side part in the embodiment. The expansion | deployment perspective view which shows the sewing aspect about the airbag concerning the embodiment. The front view which shows the aspect after the said airbag is sewn about the airbag apparatus of the embodiment. Sectional drawing which shows the cross section along line 5-5 in FIG. Sectional drawing which shows the aspect immediately after the impact more than predetermined value was added from the side of the vehicle about the airbag concerning the embodiment. Sectional drawing which shows a mode when the difference of the internal pressure of a waist | hip | lumbar part chamber and a chest chamber becomes larger than predetermined value about the airbag concerning the embodiment. Sectional drawing which shows an aspect when the gas injected by an inflator becomes weak about the airbag concerning the embodiment.

Explanation of symbols

  P ... occupant, Ps ... waist, Pt ... chest, 11 ... body side part, 12 ... vehicle seat, 13 ... seat cushion, 14 ... seat back, 20 ... side airbag device, 21 ... inflator, 21a ... spout, 22 ... Airbag, 30 ... External base fabric, 30a, 30b ... Polymerized portion, 31 ... Outer bag, 40 ... Internal base fabric, 40a, 40b ... Polymerized portion, 41 ... Inner bag, 41a, 42a ... Communication hole, 41b, 42b ... end, 42 ... inner bag, 43 ... storage, 43a ... end, 51 ... waist chamber, 52 ... chest chamber, 60 ... gap, 301, 401 ... sewing thread.

Claims (5)

An airbag including an outer bag and a pair of inner bags housed in the outer bag and fixed to the inner wall of the outer bag, and gas is ejected into the pair of inner bags in response to an impact applied to the vehicle An airbag device comprising an inflator,
The pair of inner bags are formed in the inner bag while forming a partition partitioning the interior of the outer bag into a plurality of chambers by inflating with the gas ejected by the inflator and bringing the outer walls into close contact with each other. The gas in the inner bag is supplied to the chambers except for at least one of the plurality of chambers through the communication hole, and the close outer wall is separated based on the increase in the internal pressure of the chamber to which the gas is supplied. An air bag device characterized in that In the airbag apparatus of Claim 1,
The pair of inner bags are fixed to two opposing inner walls of the outer bag, respectively, and exhibit a pipe shape extending in a parallel direction when inflated by the gas ejected by the inflator. . In the airbag apparatus of Claim 2,
An air bag device characterized in that the inner spaces of the pair of inner bags communicate with each other. In the airbag apparatus as described in any one of Claims 1-3,
When a side impact is applied to the vehicle, the chamber to which the gas in the inner bag is supplied expands between the occupant's waist and the inner wall of the vehicle, but the gas in the inner bag is not supplied. An air bag apparatus, wherein the chamber is inflated between an occupant's chest and an inner wall of the vehicle. In the airbag apparatus of Claim 4,
The pair of inner bags are inflated between a waist part of an occupant and an inner wall of the vehicle.

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