JP5187931B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag apparatus that mainly protects an occupant from an impact when a vehicle has a side collision (side collision) or an impact when a vehicle rolls over.

  Airbag devices that protect passengers from impacts when a vehicle such as an automobile collides include driver airbag devices installed on the steering wheel and passenger seat air installed in the instrument panel in front of the passenger seat. In addition to the airbag device installed in the seat bag of the seat to protect the occupant seated in the bag device and the rear seat, the side that protects the occupant from the impact when the vehicle collides or rolls over There is a crash airbag device.

  The side airbag device includes a curtain airbag device in which an airbag is stored along a roof rail, an airbag device in which an airbag is stored in a seat seat bag, and an airbag stored in a vehicle door. In the case of a side impact or rollover of the vehicle, the airbag is instantly deployed between the side of the passenger compartment and the occupant to protect the occupant from the impact caused by the side impact or rollover. It is like that.

  On the other hand, as an airbag device in which an airbag is accommodated in a door of a vehicle, for example, there is one described in Patent Document 1.

  The airbag device described in Patent Document 1 is housed inside a door in a state where an airbag (inflatable cushion) having a peripheral edge larger than the peripheral edge of a window glass provided on the door is folded.

  And the interior material which covers the inner surface of a door is provided with the opening part, and the cushion shape holder | retainer is provided so that this opening part may be covered.

  In the cushion-shaped cage, a tab provided on the lower edge is engaged with the lower edge of the opening, and the airbag is held as follows when the airbag is inflated and deployed.

  That is, as schematically shown in FIG. 16A, the airbag a is housed inside the door together with the inflator b in a folded state, and an opening of an interior material that covers the inner surface of the door c (both not shown). Is closed by a cushion-shaped cage d.

  On the other hand, when the vehicle bumps or rolls over, the airbag a starts to inflate upward along the wind glass e surface by the high pressure gas ejected from the inflator b, as shown in FIG. The upper part of the cushion-shaped cage d is opened by the expansion pressure.

Thereafter, when the airbag a starts to be deployed, the cushion-shaped retainer d is further opened as shown in FIG. 16-3, and finally the airbag a is attached to the window glass e of the door c as shown in FIG. 16-4. It is deployed between a passenger (not shown) and protects the passenger from an impact when the vehicle collides or rolls over.
Japanese Patent Laid-Open No. 2005-88884

  However, in the airbag device described in Patent Document 1, when the airbag a is inflated, the airbag a is brought into contact with and pressed by a portion f (hereinafter referred to as a neck portion) supported by the upper edge portion of the cushion-shaped cage d. It is conceivable that the neck portion f is developed so as to be inclined in the occupant direction as indicated by the arrows in FIG.

  In view of this point, the present invention has an object to provide an airbag device that can be extremely stably deployed to an occupant when the airbag is inflated and deployed.

The airbag device according to the present invention is installed in a space surrounded by a vehicle compartment side surface (10) formed by a vehicle body panel and interior materials of a vehicle, and is ejected from an inflator (2) when the vehicle collides. An opening ( 10b ) formed on the side surface (10) of the casing is opened by the inflation gas, and the airbag body (1) is raised on the side surface (10) of the casing above the opening ( 10b ). An airbag device configured to be inflated and deployed, wherein the airbag body (1) has a gas introduction part ( 1c ) for introducing an inflating gas ejected from the inflator (2) and the gas introduction part ( has 1c) expansion chamber inflated and deployed by the introduced the inflation gas from the (1f), and said expansion chamber (1f) in the plurality of expansion by a plurality of baffles arranged substantially vertically (7) And configured to be partitioned into the gas inlet portion (1c) is with its longitudinal direction is formed so as to extend in the width direction (vehicle front-rear direction) of the expansion chamber (1f), the air bag body By forming a constricted shape part constricted in the width direction of the expansion chamber (1f) between the gas introduction part ( 1c ) and the expansion chamber (1f) in ( 1 ), the constricted shape part and the The portion connected to the expansion chamber (1f) is configured as a neck portion (1d) that is in close contact with the vicinity of the opening on the side surface (10) of the passenger compartment, and the baffle (7) that partitions the expansion chamber (1f). Is attached to a base fabric (1a) constituting the airbag body (1) in the neck portion (1d), and the neck portion (1d) is deployed in the thickness direction (occupant direction) of the airbag body (1). It is formed to regulate the, before To the longitudinal dimension of the gas inlet, the dimension in the thickness direction of the expansion chamber (1f) configured to widening, of the plurality of baffles (7), the baffles located at the end side in the width direction (7) is provided on the inner side of the constricted portion narrowed in the width direction, and when the expansion chamber (1f) is inflated and deployed, the overall height of the airbag body (1) is reduced from the original size before inflation. And the neck (1d) is similarly contracted, so that the expansion chamber (1f) is pulled down and is strongly seated in a state of being seated on the side surface (10) of the vehicle compartment from above (10). It has posture holding means (11a) configured to regulate the deployed posture of 1).

With the above configuration, the expansion chamber is configured such that the thickness direction dimension thereof is wider than the longitudinal direction dimension of the gas introduction portion, and thus the overall height of the airbag body is reduced from the original size before the expansion. As a result, the neck portion is similarly shrunk, and as a result, the expansion chamber receives a force to be lowered downward, and the vehicle compartment side surface (for example, a waist portion or an armrest portion in the case of a door trim) is viewed from above. Since the airbag body is brought into close contact with the seat and deployed, the self-supporting stability of the airbag body is increased, and the airbag body exerts a predetermined occupant restraint performance to reliably restrain the occupant.

Further, with the above configuration, when the expansion chamber is deployed, the portion where the constricted portion and the expansion chamber are connected is deployed in close contact with the opening on the side surface of the vehicle compartment, thereby improving the self-supporting stability of the airbag body. The air bag body can further improve the occupant restraining performance, and the occupant can be restrained more reliably.

According to the airbag apparatus of the present invention, the expansion chamber is configured such that the thickness direction dimension is wider than the longitudinal direction dimension of the gas introduction portion. As a result, the expansion chamber shrinks in the direction of reduction, and as a result, the expansion chamber receives a force to be lowered downward and is brought into strong contact with the side surface of the passenger compartment (for example, in the case of a door trim, its waist or armrest). In order to deploy, the self-supporting stability of an airbag main body increases, and this enables the airbag main body to exhibit a predetermined occupant restraint performance and reliably restrain the occupant.

  Embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a front view of an airbag device installed in a door, FIG. 2 is a development view of an airbag body, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 5-1 to 5-3 are developed views of the baffle, FIG. 6 is a side view of the cover, and FIGS. 7-1 to 7-5 are explanatory views showing the folding procedure of the airbag body, FIGS. 8-1 to 8-4 are operation explanatory views of the airbag apparatus.

  The airbag apparatus shown in FIG. 1 includes an airbag main body 1 formed of a woven fabric such as nylon, an inflator 2 that injects high-pressure gas during a side collision or rollover of a vehicle, and high-pressure gas ejected from the inflator 2 as air. It consists of a gas introduction pipe 3 that leads into the bag body 1.

  The airbag main body 1 is composed of two substantially elliptical base fabrics 1a formed slightly larger than the glass 5 provided on the upper part of the door 4 in which the airbag device is installed.

  Each base fabric 1a is cut so that the warp and weft forming the woven fabric are in an oblique direction (bias direction) as shown by an arrow C in FIG. 2, and the lower side portion 1b cut almost horizontally is formed. The entire outer peripheral edge including the seam is sewn with a sewing thread 6.

  The airbag body 1 is formed in a state where the longitudinal direction is along the lower side portion 1b, that is, the longitudinal direction of the vehicle, and introduces an inflating gas ejected from the inflator 2, and a gas introduction portion 1c. An expansion chamber 1f that expands and expands with an expansion gas introduced from the neck, and a neck portion 1d that is formed between the gas introduction portion 1c and the expansion chamber 1f and has a constricted shape constricted in the width direction of the expansion chamber 1f, that is, in the longitudinal direction of the vehicle. A plurality of, for example, three baffles 7 are provided in an expansion chamber 1f existing above the neck 1d.

The inflatable portion 1f is configured such that its thickness-direction dimension is wider than the longitudinal dimension of the gas introduction portion 1c.

  The baffle 7 is formed of a woven fabric similar to that of the airbag body 1, and includes a first baffle 7a provided on the rear side (left side in FIG. 2) in the airbag body 1 and a first baffle 7 provided in the center. 2 baffle 7b and a third baffle 7c provided on the front side (right side in FIG. 2) of the airbag body 1, and the direction of warp and weft is air as shown in FIGS. The bias direction is the same as that of the bag body 1.

  The first to third baffles 7a to 7c are formed in a substantially fan shape having substantially the same size, the upper edges of the first and third baffles 7a and 7c are substantially chevron, and the upper edges of the second baffles 7b are It is formed in a substantially arc shape.

  Both side edges and upper edges of each baffle 7 are sewn to the inner surface of a base fabric 1a that forms the airbag body 1 with sewing threads 8, thereby dividing the expansion chamber 1f in the airbag body 1 into three chambers. In addition, the expansion chambers 1f are connected to each other by a plurality of, for example, two vent holes 7d formed in each baffle 7.

  The gas introduction portion 1c formed along the lower side portion 1b of the airbag body 1 is formed in a rectangular shape having substantially the same length as the lower side portion 1b, and one end side is closed by a sewing thread 6 and the other end side is gas. It is opened as an inlet 1e, and the tip side of the gas inlet tube 3 is inserted into the gas inlet 1c from the gas inlet 1e, and the tip of the gas inlet 1e is a gas as shown in FIG. It protrudes to the outside of the introduction part 1c.

  The lower edge of the baffle 7 that divides the interior of the airbag body 1 into a plurality of expansion chambers 1f reaches the neck 1d of the airbag body 1, and the lower side edges of the baffle 7 form the neck 1d in the neck 1d. 1a is sewn with a sewing thread 8, thereby forming a deployment regulating means 7f that regulates the deployment of the neck 1d continuous with the lower portion of the inflation chamber 1f in the thickness direction (occupant direction) of the airbag body 1. ing.

  Further, both side surfaces of the gas introduction part 1 c formed at the lower part of the airbag body 1 are reinforced by the cover 9.

  The cover 9 is formed by a woven fabric similar to the airbag main body 1 and the baffle 7 so as to be almost twice as large as the gas introduction portion 1c. As shown in FIG. 6, the warp forming the woven fabric is vertical, The weft is cut to be horizontal.

  The cover 9 is substantially U-shaped by folding it in half from the bottom side, and the bottom side and one end side are sewn to the periphery of the gas introduction unit 1c by the sewing thread 6 with the gas introduction unit 1c inserted between the side surfaces. It is worn.

  A plurality of gas introduction pipes 3 inserted into the gas introduction part 1 c from the gas introduction port 1 e are introduced so that gas is introduced almost evenly into the respective expansion chambers 1 f in the airbag body 1 partitioned into a plurality of chambers by the baffle 7. The gas ejection holes 3a are formed at almost equal intervals.

  The other end side of the gas introduction pipe 3 is bent in a substantially J shape, and the inflator 2 is connected to the end.

  The inflator 2 is formed in a cylindrical shape, and is provided with a gas outlet 2a that ejects high-pressure gas when the vehicle side impacts or rolls over at one end. The other end of the gas introduction pipe 3 is provided at the gas outlet 2a. The sides are connected airtight.

  On the other hand, in the door 4 in which the airbag main body 1 is installed, the side surface of the passenger compartment except for the window glass 5 is covered with an interior material (door trim) 10.

  In the interior material 10, an armrest 10a protruding toward the passenger compartment is projected in a horizontal direction at a substantially central portion, and an opening 10b through which the airbag body 1 bulges is opened above the armrest 10a. .

  The opening part 10b is provided with an interior material opening part 11 so as to cover it.

  The interior material opening part 11 is formed of the same material as the interior material 10 so as not to cause a sense of incongruity with the interior material 10. The upper part of the interior material opening part 11 has an upper surface of the airbag device. A jaw-like posture holding means 11a is formed so as to cover it.

  The posture holding means 11 a is integrally formed with the interior material opening portion 11, and the leading edge 11 b is in contact with the inner surface of the door 4 during normal times.

  Further, when the airbag main body 1 is deployed, the posture holding means 11a supports the upper portion of the inflated neck portion 1d and holds the airbag main body 1 in a self-supporting posture.

  The lower edge part of the interior material opening part 11 is connected to the interior material 10 by a hinge (not shown) so that the upper part of the interior material opening part 11, that is, the posture holding means 11a can be opened to the vehicle compartment side around the hinge. It has become.

  Next, the operation of the thus configured airbag device will be described.

  In installing the airbag device in the door 4, the airbag body 1 is first folded by the procedure shown in FIGS. 7-1 to 7-5.

  That is, first, the baffle 7 sewn in the airbag main body 1 is folded from substantially the center and positioned between the base fabrics 1a as shown in FIG. As shown in FIG. 7B, each base fabric 1a is spread on a flat upper surface such as a workbench, and then both ends of the airbag body 1 are bent. As shown in FIG. Approximately matches the length of 1c.

  Next, when the upper edge portion of the airbag body 1 is folded as shown in FIG. 7-3, the airbag body 1 is rolled as shown in FIG. Wrap it so that it won't collapse.

  When the folding of the air bag body 1 is completed, the gas is introduced in a state where one end side of the gas introduction pipe 3 is inserted into the gas introduction portion 1c from the gas introduction port 1e and the tip portion protrudes outward from the gas introduction portion 1c. The mouth 1e is hermetically closed.

  Next, with the airbag main body 1, the inflator 2 and the gas introduction pipe 3 positioned inside the door 4 as shown in FIG. 1, the distal end portion, the bent portion and the inflator of the gas introduction pipe 3 are fixed by fixing means 13 such as screws. 2 is attached to the inside of the door 4, and the airbag device is installed in the door 4.

On the other hand, as shown in FIG. 8A, the airbag device installed in the door 4 is covered by the posture holding means 11 a of the interior material opening portion 11 that covers the opening portion 10 b of the interior material 10 above the airbag device. In the normal state, the airbag device is not exposed to the interior of the vehicle, but when the vehicle collides or rolls over, high-pressure gas is ejected from the inflator 2.

  When this high-pressure gas is introduced from the gas introduction pipe 3 into the gas introduction part 1c of the airbag main body 1, the neck 1d of the airbag main body 1 starts to expand, and the airbag main body 1 folded into a roll shape is illustrated. Push up as shown in 8-2.

  As a result, the posture holding means 11 a of the interior material opening portion 11 is pushed open toward the vehicle compartment side around the hinge by the inflation pressure of the airbag body 1, so that the expansion chamber 1 f of the airbag body 1 is the window glass 5 of the door 4. Deployment starts upward along the inner surface as shown in FIG.

  Thereafter, the inflation chamber 1f of the airbag body 1 is further expanded upward while continuing to inflate, but the neck portion 1d of the airbag body 1 has a deployment regulating means formed by the lower portion of the baffle 7 that defines the interior of the inflation chamber 1f. Since the deployment in the occupant direction is restricted by 7f, the neck portion 1d is not deployed toward the occupant side, and at the same time, the neck portion 1d is expanded more firmly than the expansion chamber 1f by the high-pressure gas flowing into the expansion chamber 1f from the gas introduction portion 1c. .

Further, since the expansion chamber 1f is configured to expand its thickness direction dimension with respect to the longitudinal direction dimension of the gas introduction part 1c, the overall height of the airbag body 1 is as shown in FIG. While shrinking in the direction of shrinking from the original size before expansion, the neck portion 1d is similarly contracted. As a result, the expansion chamber 1f receives a force to be pulled downward, and the interior material 10 which is the side surface of the vehicle interior. Since the air bag body 1 has a self-supporting stability while being seated above the armrest 10a where the opening 10b is formed, the air bag body 1 has a self-supporting stability. Demonstrate and restrain the occupant reliably. The opening 10b may be formed in the waist part of the interior material 10 near the entrance of the glass 5a. In this case, the inflated and expanded part 1f is in close contact with the waist part in a state of being seated. Will be deployed.

  In addition, since the upper part of the neck 1d is pressed against the door 4 by the jaw-shaped posture holding means 11a formed on the upper part of the interior material opening part 11, the expansion chamber 1f has the neck 1d, the expansion chamber 1f, The portion where the two are connected to each other is deployed in close contact with the opening 10b in the interior material 10, thereby further increasing the self-supporting stability of the airbag body 1, and thereby the airbag body 1 further improves the occupant restraint performance. Can be restrained more and more reliably.

  In order to stabilize the airbag body 1 in a self-supporting posture, it is desirable to hold the vicinity of the upper portion of the neck portion 1d by the posture holding means 11a.

  Further, in order to enhance the self-supporting property of the airbag body 1, the lower part of the baffle 7 may be extended to the gas introduction part 1c as shown by the dotted line in FIG.

  In the first modification shown in FIGS. 10 to 12, the cylindrical body 14 having an inner diameter substantially equal to the outer diameter of the gas introduction pipe 3 is sewn with a woven fabric made of the same material as the base cloth 1a of the airbag main body 1. A cylindrical body 14 is mounted on the distal end side of the gas introduction pipe 3, and the cylindrical body 14 has a gas as shown in FIG. 12 at a position that matches the gas ejection hole 3a formed in the gas introduction pipe 3. The ejection hole 14a may be formed, and the cylindrical body 14 made of a woven fabric has air permeability, so that the gas ejection hole 14a is not particularly required.

  When one end side of the gas introduction pipe 3 to which the cylindrical body 14 is attached is inserted into the gas introduction portion 1c, the seam allowance 14b portion of the cylindrical body 14 and the lower side portion 1b of the gas introduction portion 1c are sewn as shown in FIG. 6 to fix the cylindrical body 14 to the gas introduction part 1c.

  As a result, when the airbag body 1 is deployed, the posture stability of the airbag body 1 is further enhanced by the frictional force between the outer peripheral surface of the gas introduction tube 3 and the tubular body 14.

  A preferred second modification of the airbag body 1 when the object 15 is on the deployment direction side of the airbag body 1 will be described with reference to FIGS.

  In the second modified example, a plurality of, for example, two mounting pieces 16 project from the outer peripheral surface at one end of the gas introduction pipe 3, and the mounting pieces 16 are formed in the gas introduction portion 1c through slits 1g formed in the gas introduction portion 1c. The gas introduction pipe 3 is fixed by a mounting piece 16 so as to protrude outward.

  As a result, as shown in FIG. 15, the airbag 15 is deployed so as to abut on the object 15 having a surface along the direction in which the object 15 is deployed, and the airbag body 1 can be deployed in a self-supporting posture.

  In the above-described embodiment, the airbag device installed in the door 4 has been described. However, when the vehicle collides or rolls over, the airbag device is deployed from a curtain airbag device or a seat seat bag. Applicable to side impact airbag devices where the bag body is deployed, passenger seat airbag devices installed in the instrument panel in front of the passenger seat, airbag devices that protect the passenger's knees and the vicinity It can be done.

Since the airbag apparatus of the present invention is configured so that the dimension in the thickness direction in the expansion chamber is wider than the dimension in the longitudinal direction of the gas introduction portion, the overall height of the airbag body is larger than the original dimension before expansion. The expansion chamber shrinks in the direction of reduction, and as a result, the expansion chamber receives a force to be pulled downward, and develops while being in close contact with the side surface of the passenger compartment (for example, its waist or armrest in the case of a door trim). Therefore, the self-supporting stability of the airbag main body is increased, and thereby the airbag main body exhibits a predetermined occupant restraint performance and can reliably restrain the occupant. It is most suitable for airbag devices that protect passengers from impacts.

1 is a front view of an airbag device according to an embodiment of the present invention. It is an expanded view of the airbag main body which comprises the airbag apparatus which becomes embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is an expanded view of one baffle provided in the airbag main body which comprises the airbag apparatus which becomes embodiment of this invention. It is an expanded view of the other baffle provided in the airbag main body which comprises the airbag apparatus which becomes embodiment of this invention. It is an expanded view of another baffle on the tray provided in the airbag main body which comprises the airbag apparatus which becomes embodiment of this invention. It is a side view of the cover which covers the gas introduction part of the airbag main body which comprises the airbag apparatus which becomes embodiment of this invention. It is explanatory drawing which shows the folding procedure of the airbag which comprises the airbag apparatus which becomes embodiment of this invention, and is substantially U-shaped between the both base fabrics which folded the baffle sewn on the airbag main body in the center. It shows a state where the two base fabrics are deployed on the work table. Similarly, it is explanatory drawing which shows the folding procedure of the airbag which comprises the airbag apparatus which becomes embodiment of this invention, and has shown the state which folded the both ends of the airbag main body from the state of FIGS. Similarly, it is explanatory drawing which shows the folding procedure of the airbag which comprises the airbag apparatus which becomes embodiment of this invention, and has shown the state which folded the upper end part of the airbag main body from the state of FIGS. 7-2. Similarly, it is explanatory drawing which shows the folding procedure of the airbag which comprises the airbag apparatus which becomes embodiment of this invention, and has shown the state which rolls an airbag main body from the state of FIGS. 7-3. Similarly, it is explanatory drawing which shows the folding procedure of the airbag which comprises the airbag apparatus which becomes embodiment of this invention, and roll folding is advanced from the state of FIGS. 7-4, folding of the airbag main body is completed, and it folds The packaged state is shown so that the shape does not collapse. BRIEF DESCRIPTION OF THE DRAWINGS It is effect | action explanatory drawing of the airbag apparatus which becomes embodiment of this invention, The state which accommodated the folded airbag main body in the cushion shape holder | retainer is shown. Similarly, it is action explanatory drawing of the airbag apparatus which becomes embodiment of this invention, and has shown the initial state by which the upper part of a cushion shape holder | retainer is open | released at the time of a side collision or rollover of a vehicle. Similarly, in the operation explanatory diagram of the airbag device according to the embodiment of the present invention, the upper part of the cushion-shaped retainer is further opened in the event of a side collision or rollover of the vehicle, and a part of the airbag body is a cushion-shaped retainer. It shows a state where it is deployed outside. Similarly, in the operation explanatory view of the airbag device according to the embodiment of the present invention, the upper part of the cushion-shaped retainer is opened in the event of a side collision or rollover of the vehicle, and the airbag body is completely inflated to retain the cushion shape. It shows a state where it has been deployed outside the vessel. It is explanatory drawing which shows the modification of the airbag main body which comprises the airbag apparatus which becomes embodiment of this invention. It is explanatory drawing which shows the 1st modification of the airbag apparatus which becomes embodiment of this invention. It is sectional drawing which follows the DD line | wire of FIG. It is a side view of the cylindrical body provided in the 1st modification of the airbag apparatus which becomes embodiment of this invention. It is explanatory drawing which shows the 2nd modification of the airbag apparatus which becomes embodiment of this invention. It is sectional drawing which follows the EE line | wire of FIG. It is an operation explanatory view showing the 2nd modification of an air bag device used as an embodiment of the invention, and shows the state where an air bag main part is developed normally, and is holding a self-supporting posture. It is operation | movement explanatory drawing of the conventional airbag apparatus, and the state which accommodated the folded airbag main body in the cushion shape holder | retainer is shown. Similarly, in the operation explanatory view of the conventional airbag device, an initial state in which the upper part of the cushion-shaped cage is opened in the case of a side collision or rollover of the vehicle is shown. Similarly, in the operation explanatory view of the conventional airbag device, the upper part of the cushion-shaped retainer is further opened in the case of a side collision or rollover of the vehicle, and a part of the airbag body is deployed outside the cushion-shaped retainer. Show. Similarly, in the operation explanatory diagram of a conventional airbag device, the upper part of the cushion-shaped cage is opened in the event of a side collision or rollover of the vehicle, and the airbag body is completely inflated and deployed outside the cushion-shaped cage Is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airbag main body 1c Gas introduction part 1d Neck part 1f Expansion chamber 2 Inflator 3 Gas introduction pipe 4 Door 5 Glass (vehicle compartment side surface)
10 Interior materials (vehicle compartment side)
10a opening

Claims (1)

It is installed in a space surrounded by a vehicle compartment side surface (10) formed by a vehicle body panel and interior materials of the vehicle, and the vehicle compartment side surface is inflated by an inflating gas ejected from the inflator (2) when the vehicle collides. The air configured so that the opening ( 10b ) formed in ( 10 ) is opened and the airbag body (1) is inflated and deployed in an upright manner on the side surface (10) of the passenger compartment above the opening ( 10b ). a bag system, the air bag body (1), the inflator (2) has been introduced gas inlet for introducing the jetted inflation gas (1c) from the gas introduction portion (1c) from the expansion It has the use gas expansion chamber inflates and (1f), and wherein the expansion chamber (1f) is configured to be divided into a plurality of expansion chambers by a plurality of baffles arranged substantially vertically (7), Serial gas inlet (1c) together with the longitudinal direction are formed so as to extend in the width direction (vehicle front-rear direction) of the expansion chamber (1f), wherein the gas inlet portion of the air bag body (1) By forming a constricted portion narrowed in the width direction of the expansion chamber (1f) between ( 1c ) and the expansion chamber (1f), the constricted shape portion and the expansion chamber (1f) are connected to each other. The portion to be formed is configured in a neck portion (1d) that is in close contact with the vicinity of the opening in the side surface (10) of the vehicle interior, and the lower portion of the baffle (7) that defines the expansion chamber (1f) is the neck portion (1d). said mounting a base fabric constituting the airbag body (1) (1a) is formed so that the neck portion (1d) to regulate the to deploy the air bag body (1) to the thickness direction (the occupant direction) in , the longitudinal dimension of the gas inlet portion In contrast, the configured to widening the dimension in the thickness direction of the expansion chamber (1f), the plurality of baffles (7), constriction in said baffle (7) in the width direction on the edge side in the width direction Further, provided at the inner side of the constricted portion, when the expansion chamber (1f) is inflated and deployed, the overall height of the airbag main body (1) is contracted in the direction of contraction from the original size before the expansion, and the neck (1d ) Is similarly contracted, the expansion chamber (1f) is pulled downward and is brought into close contact with the passenger compartment side surface (10) while being seated from above, thereby restricting the deployed posture of the airbag body (1). An airbag apparatus comprising the posture holding means (11a) configured as described above.

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