JP2005199961A - Airbag device for front passenger seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device for a front passenger seat capable of correctly protecting the head of an occupant by suppressing the reaction force when the head of the occupant interferes with a fully inflated airbag. <P>SOLUTION: The airbag device for the front passenger seat is folded and stored in a case 45 arranged in an instrument panel 1 in front of the front passenger seat and provided with an airbag 10 to be protruded backward of a vehicle on an occupant side from the case 45 when inflation gas flows in. The airbag 10 is constituted as an annular body to complete inflation so that a center hole 11 is closed by base cloths 24 and 26 having inflatable peripheries thereof by arranging the center hole 11 which is through substantially in the vertical direction. The airbag 10 is constituted so that a part 17 of the base cloth at the peripheral edge on an upper end 11a side of the center hole 11 is arranged substantially facing a head H of an occupant P seated in the front passenger seat when deployment and inflation of the airbag is completed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention includes an airbag that is folded and housed in a case disposed in an instrument panel in front of a passenger seat and that can protrude from the case to the rear side of the vehicle on the passenger side when inflating gas flows. The present invention relates to an airbag device for a passenger seat.

Conventionally, in an airbag device for a passenger seat, during deployment and inflating, the airbag is protruded to the occupant side with the surface on the occupant side wide open so that partial pressing force does not act on the occupant side. It was folded and stored (see, for example, Patent Document 1).
JP 2002-255004 A

  However, in the conventional airbag device for the passenger seat, the airbag is in the shape of a bag and is configured to protect the occupant's head and chest with a wide planar surface. There is room for improvement in terms of protecting the passengers accurately by suppressing the reaction force applied to them when they interfere with the passengers. In particular, the occupant's head has a small mass, and there is room for further improvement in terms of protection by suppressing the reaction force during interference.

  The present invention solves the above-described problem, and when the occupant's head interferes with an airbag that has been inflated, the reaction force can be suppressed to accurately protect the occupant's head. An object of the present invention is to provide a passenger airbag device.

An airbag device for a passenger seat according to the present invention is folded and housed in a case disposed in an instrument panel in front of the passenger seat, and the vehicle rear side on the passenger side from the case when inflating gas flows in. An airbag device for a passenger seat equipped with an airbag that can project to
Airbag
It is configured as an annular body that arranges a central hole penetrating in a substantially vertical direction and completes expansion so that the central hole is closed by a surrounding swelling base cloth,
When the expansion / expansion is completed, the peripheral base cloth portion on the upper end side of the central hole is arranged so as to be substantially opposed to the head of the passenger seated in the passenger seat. .

  In the passenger seat airbag device according to the present invention, the airbag completes the inflation so that the portion of the base fabric that forms the periphery on the upper end side of the central hole faces the head of the passenger seated in the passenger seat. It will be. Therefore, in the passenger seat airbag device of the present invention, the head of the occupant interferes with a portion of the base fabric that forms the periphery of the central hole in the airbag. When the airbag head is completely inflated, the head of the occupant interferes with a portion of the base fabric that forms the periphery of the central hole in the airbag. It will be restrained so that the movement to the front side may be suppressed. That is, the occupant's head that has interfered can move so as to enter the lower side of the central hole, and the reaction force applied to the occupant's head can be reduced. Therefore, in the passenger seat airbag device of the present invention, the head of the occupant can be protected by suppressing the reaction force at the time of interference by the airbag that has been inflated.

  Therefore, in the passenger seat airbag device of the present invention, when the occupant's head interferes with the airbag that has been inflated, the reaction force can be suppressed and the occupant's head can be protected accurately.

  In the airbag device for a passenger seat according to the present invention, since the airbag is configured to complete the inflation so that the central hole is closed by the surrounding inflating base cloth, a predetermined internal pressure can be secured and the center can be secured. Combined with restraining the occupant's chest at the periphery of the hole, even if the occupant's head interferes with the periphery of the center hole, the occupant's head does not enter the center hole and the occupant's head The force can be restrained and restrained accurately.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The vertical / front / rear / left / right relationship in this specification is based on the state in which the passenger seat airbag device M is mounted on the vehicle, and matches the vertical / front / rear / left / right relationship of the vehicle when mounted. To do.

  The passenger seat airbag apparatus M according to the embodiment is a top mount type that is disposed inside an upper panel 1a of an instrument panel (instrument panel) 1 as shown in FIGS. The airbag apparatus M includes a folded airbag 10, an inflator 43 that supplies inflation gas to the airbag 10, a case 45 that stores and holds the airbag 10 and the inflator 43, and the airbag 10 in the case 45. A retainer 41 for attachment and an airbag cover 52 covering the folded airbag 10 are provided.

  In the embodiment, the airbag cover 52 is formed integrally with the instrument panel 1 as shown in FIGS. The instrument panel 1 includes a base portion 2 made of a hard synthetic resin such as polypropylene on the back surface side, and a covering layer 3 having a foam layer such as polyurethane foam and a skin layer covering the outer surface side of the base portion 2. Configured. A soft portion 4 made of a soft synthetic resin such as an olefin-based thermoplastic elastomer is disposed in place of the air bag cover 52 instead of the base portion 2. The airbag cover 52 is configured by disposing two door portions 53 (53F and 53B) in which a thin portion to be broken 55 is disposed around. The breakable portion 55 is arranged in a substantially H shape when viewed from the top of the instrument panel 1, and the two door portions 53F and 53B are provided on both the front and rear sides with the front end side and the rear end side as hinge portions 54, respectively. Configured to open.

  Further, a connecting wall portion 56 having a substantially rectangular tube shape that protrudes downward from the back surface side is disposed at a portion of the airbag cover 52 so as to surround the arrangement position of the door portions 53F and 53B. A plurality of locking holes 57 are penetrated at predetermined positions of the wall portions 56 a and 56 b facing each other in the front-rear direction in the connecting wall portion 56. The locking claw 51 formed in the case 45 is inserted into the locking holes 57, and the connecting wall portion 56 is locked to the locking claw 51. Locking of the connecting wall portion 56 of each locking claw 51 secures the connection state between the connecting wall portion 56 and the case 45, and the airbag 10 when inflated smoothly pushes up the door portions 53F and 53B. This is because the planned fracture portion 55 can be broken.

  In the case of the embodiment, the soft portion 4 includes the back surface side of the door portions 53F and 53B of the airbag cover 52, the connecting wall portion 56 itself, and the instrument panel 1 in the vicinity of the hinge portions 54 of the door portions 53F and 53B. It arrange | positions in the back-and-front site | part which exceeded the connection wall part 56 in the back surface side.

  As shown in FIGS. 1 and 2, the case 45 is formed in a substantially rectangular parallelepiped shape made of sheet metal having a substantially rectangular opening 45 a on the upper end side, and includes a rectangular plate-like bottom wall portion 46, and a bottom wall portion 46. And a side wall portion 50 extending upward from the outer peripheral edge toward the airbag cover 52 side in a substantially rectangular tube shape. The bottom wall portion 46 has a rectangular plate shape that extends in the left-right direction, and has an insertion hole 47 that opens in a substantially circular shape in the center so that the upper side of the inflator 43 can be inserted from below into the airbag cover 52 side. I have. An attachment hole 48 through which each bolt 41 b of the retainer 41 can be inserted is formed at the periphery of the insertion hole 47 of the bottom wall portion 46. Further, brackets 49 for connecting the case 45 to the vehicle body 6 side are fixed to the bottom wall portion 46 on the lower surface sides of the left and right side portions of the bottom wall portion 46, respectively. A nut 49 a for screwing the bolt 7 is fixed to each bracket 49. A bracket 6b extending from the reinforcement 6a is disposed on the body 6 side, and the bolt 7 passes through the mounting seat 6c of the bracket 6b and is screwed into the nut 49a. The case 45, that is, the airbag apparatus M, is attached and fixed to the body 6 side by tightening each bolt 7 to the nut 49a.

  The side wall 50 of the case 45 is formed with a plurality of locking claws 51 that are inverted outward and downward from the case 45 at the upper ends of the front and rear parts of the vehicle. As described above, each locking claw 51 is inserted into the locking hole 57 of the connecting wall portion 56 of the airbag cover 52 to lock the connecting wall portion 56.

  The inflator 43 is of a disc type provided with a substantially cylindrical main body 43a having a plurality of gas discharge ports 43b on the upper outer peripheral surface. A flange portion 43c for attaching the inflator 43 to the case 45 is provided on the outer peripheral surface of the main body portion 43a. The flange portion 43c has a substantially quadrangular annular shape (substantially square plate shape) protruding from the outer peripheral surface of the main body portion 43a, and has attachment holes 43d penetrating through the four corners. Each mounting hole 43 d is disposed at a position corresponding to each mounting hole 48 of the bottom wall portion 46 of the case 45 and has an inner diameter dimension substantially the same as the inner diameter dimension of the mounting hole 48.

  The retainer 41 is formed of a sheet metal, and has a base portion 41a having a hole that opens substantially in the same shape as the insertion hole 47 of the case 45, and a substantially rectangular tube shape extending upward from the outer peripheral edge of the base portion 41a on the airbag cover 52 side. And a guide wall portion 41c. The base 41a has an outer peripheral edge formed in a substantially square shape (substantially square shape), and bolts 41b extending downward are fixed to the four corner portions. The bolts 41b are provided in the state in which the retainer 41 is disposed in the airbag 10, and the mounting holes 21 of the airbag 10, the mounting holes 48 of the bottom wall portion 46 of the case 45, and the mounting holes of the flange portion 43c of the inflator 43. The airbag 10 and the inflator 43 are attached to the bottom wall portion 46 of the case 45 by being inserted into 43 d and tightening the nut 42. That is, when the nut 42 is tightened to each bolt 41b, the peripheral edge 19 of the gas inlet 20 of the airbag 10 is pressed against the bottom wall portion 46 by the base portion 41a, and the airbag 10 is attached to the bottom wall portion 46. The flange portion 43 c of 43 is pressed against the peripheral edge of the insertion hole 47, and the inflator 43 is attached to the bottom wall portion 46. Further, the guide wall portion 41 c of the retainer 41 is disposed by extending the tip extending upward to a height that matches the upper end surface of the main body portion 43 a of the inflator 43. The guide wall portion 41c is disposed so as to extend upward from the outer edge of the base portion 41a, which has a substantially rectangular shape, toward the airbag cover 52 side.

  As shown in FIGS. 3 to 6, the airbag 10 has a substantially hexahedral shape when inflated. In addition, the airbag 10 has a central hole 11 extending therethrough from the rear upper part 10a to the lower part 10b at the completion of the inflation so that the central hole 11 is closed by the surrounding base cloth. It is configured as an annular body that completes the expansion. That is, in the airbag 10, the annular main body portion 12 that is inflated and inflated includes a front inflatable portion 13, a rear inflatable portion 14, a left inflatable portion 15, and a right inflatable portion 16 around the central hole 11. Let it be configured. In the case of the embodiment, the front side expansion part 13 has a vertical dimension along the central hole 11 at the completion of expansion, and a vertical dimension along the central hole 11 at the completion of expansion of the rear expansion part 14. Is set so that the upper end 13a at the completion of expansion is positioned above the upper end 14a at the time of completion of expansion of the rear expansion portion 14. The left and right inflating parts 15 and 16 arranged so as to connect the front inflating part 13 and the rear inflating part 14 descend on the upper inflating parts 15a and 16a toward the rear inflating part 14, respectively. Inclined and formed.

  In the case of the embodiment, as shown in FIGS. 5 and 8, the central hole 11 is configured to narrow the opening width dimension in the front-rear direction from the upper end 11a side to the lower end 11b side. Further, in the airbag 10, a peripheral base cloth portion on the upper end 11 a side of the central hole 11 is a head restraint portion 17 that restrains the head of the occupant. As shown in FIG. 8, the head restraint portion 12 is a part that is disposed so as to be substantially opposed to the head H of the occupant P seated in the passenger seat when the airbag 10 is completely inflated. It is comprised from the upper end side site | part 13a * 14a * 15a * 16a of front side, rear side, left side, and right side expansion part 13,14,15,16. In other words, in the case of the embodiment, the head restraint portion 17 is disposed so as to be inclined with respect to the horizontal plane as θ so that the front end side is positioned upward and the rear side is positioned downward from the horizontal plane. (See FIG. 8).

  Further, a gas inlet 20 that is opened in a circular shape so as to allow the inflating gas G to flow in and attaches the peripheral edge 19 to the case 45 is disposed at a portion on the lower end 13 b side of the front expansion portion 13. A plurality of mounting holes 21 are formed in the peripheral edge 19 of the gas inlet 20 for inserting the bolt 41 b of the retainer 41 and attaching the inlet peripheral edge 19 to the bottom wall portion 46 of the case 45. In the case of the embodiment, four reinforcing cloths 30, 31, 31, and 32 are sewn and arranged at the inlet peripheral edge 19 on the inner peripheral surface side in the airbag 10.

  The annular main body 12 in the airbag 10 of the embodiment is configured so that the airbag 10 faces the inner peripheral base fabric 24 located on the inner peripheral surface side of the central hole 11 and the inner peripheral base fabric 24 when the inflation is completed. It is comprised from the sheet material of 2 sheets of the outer peripheral side base fabric 26 located in the outer peripheral surface side. These base fabrics 24 and 26 are formed from a flexible woven fabric made of polyester yarn, polyamide yarn, or the like together with the reinforcing fabrics 30, 31, and 32, and are non-coated fabrics to which a coating agent such as silicon is not applied. ,It is configured.

  As shown in FIG. 7, the inner peripheral base fabric 24 has a substantially trapezoidal shape that is wide on the upper edge 24 a side and widens in the left-right direction. In the inner peripheral side base fabric 24, a portion that is near the center in the longitudinal direction (horizontal direction) is a portion that constitutes the front surface 14b of the rear inflatable portion 14, and a portion that is near both edges 24c and 24d in the longitudinal direction. This is a part constituting the rear surface 13d of the front-side inflatable portion 13. In the inner peripheral base fabric 24, the portions between the front side portion 14b and the rear side portions 13d and 13d are the portions constituting the inner surfaces 15c and 16c of the left and right inflated portions 15 and 16, respectively. . Further, the upper edge 24a of the inner peripheral base fabric 24 is curved and formed so as to be recessed downward in the vicinity of the center, and the lower edge 24b is also slightly extended so that the center side protrudes downward, Curved and formed. In the case of the embodiment, a portion of the inner peripheral base fabric 24 near the upper edge 24a and a portion of the outer peripheral side base fabric 26 near the upper edge 27a of the main body portion 27 described later define the head restraint portion 17. Will be configured.

  The outer peripheral base fabric 26 is a substantially rectangular main body 27 formed so as to spread in the left-right direction, and an extension projecting from the lower edge 27b side in the vicinity of both longitudinal edges 27d and 27e of the main body 27. And portions 28 and 28. Each extending portion 28 has a substantially rectangular shape and constitutes a gas inlet peripheral edge 19, and includes a gas inlet 20 that is open in a circular shape and four attachment holes 21. In the main body 27, a portion near the center in the longitudinal direction is a portion constituting the rear surface 14 c of the rear inflatable portion 14, and a portion in the vicinity of both edges 27 d and 27 e in the longitudinal direction is the front surface of the front inflatable portion 13. It is a site | part which comprises 13c. Further, in the main body 27, the portions between the rear surface side portion 14c and the front surface side portions 13c and 13c are the portions constituting the outer surfaces 15b and 16b of the left and right inflating portions 15 and 16, respectively. In addition, the upper edge 27a of the main body 27 is curved and formed so as to be recessed near the center. Further, in the main body 27, a vent hole 22 for exhausting excess inflation gas G is disposed at a portion constituting the front surface 13 c of the front expansion portion 13. In the case of the embodiment, a reinforcing cloth 34 is stitched around the periphery of each vent hole 22. In the case of the embodiment, the rear surface 14c of the rear inflatable portion 14 is disposed so as to face the chest B of the occupant P when the airbag 10 is completely inflated, and the chest that restrains the chest B of the occupant P The restraint surface 29 is used (see FIGS. 5 and 8).

  Next, the manufacture of the airbag 10 will be described. In the case of the embodiment, the airbag 10 (annular main body portion 12) is formed by stitching using a suture thread 36 such as a polyester thread. First, the extending portions 28 and 28 of the outer peripheral base fabric 26 are overlapped with each other, and a flattened reinforcing cloth 30 is stacked below the extending portion 28 to extend the extending portions 28 and 28 and the reinforcing cloth 30. Is sewn by sewing the outer peripheral edge of the reinforcing cloth 30 over the entire circumference. Thereafter, the reinforcing cloths 31 and 31 and the reinforcing cloth 32 are stacked below the reinforcing cloth 30, and the portion that becomes the outer peripheral edge of the gas inlet 20 is sewn together with the extending portions 28 and 28 and the reinforcing cloth 30. . The gas inlet 20 and the mounting hole 21 may be formed in advance in the extending portion 28 and the reinforcing cloths 30, 31, and 32. , May be formed. Further, the reinforcing cloths 34 arranged on the periphery of the vent hole 22 are respectively overlapped with the outer peripheral side base cloth 26 and stitched at a portion that becomes the periphery of the vent hole 22. Of course, the vent hole 22 may be formed in the outer peripheral base fabric 26 and the reinforcing fabric 34 in advance, or may be integrally formed by drilling after the sewing operation.

  Next, both longitudinal edges 27d and 27e of the main body 27 of the outer peripheral fabric 26 are sewn to make the main body 27 cylindrical. Similarly, the inner peripheral base fabric 24 is also formed into a cylindrical shape by sewing both longitudinal edges 24c and 24d. Thereafter, the outer peripheral base fabric 26 is inverted so that the stitched portion is not exposed, and is inserted into the inner peripheral base fabric 24, and the main body portion 27 in the inner peripheral base fabric 24 and the outer peripheral base fabric 26. The upper edges 24a and 27a are stitched together, and the base fabrics 24 and 26 are inverted so that the stitched portions are not exposed to the outside. Thereafter, the lower edges 24b and 27b of the inner peripheral base fabric 24 and the main body 27 are sewn together, and the front edge 27c of the main body 27 and the front edge 28a of each extending portion 28 are sewn. An annular body portion 12 (airbag 10) of the form can be formed.

  The mounting of the airbag 10 manufactured as described above on the vehicle will be described. First, the airbag 10 is folded with the retainer 41 disposed therein so that the bolts 41b protrude from the mounting holes 21. Further, the folded airbag 10 is wrapped around a wrapping sheet 38 (see FIG. 2) that can be broken so as not to collapse. Then, the folded airbag 10 is placed on the bottom wall portion 46 of the case 45 from the opening 45 a while the bolts 41 b are inserted through the attachment holes 48 from above. Next, the upper part of the main body 43a of the inflator 43 is inserted into the insertion hole 47, the gas inlet 20, and the base 41a of the retainer 41 from below, and each bolt 41b protruding downward from the bottom wall 46 is inserted. The flange 43c of the inflator 43 is inserted into the mounting hole 43d. Thereafter, when the nut 42 is fastened to each bolt 41 b protruding from the flange portion 43 c of the inflator 43, the folded airbag 10 and the inflator 43 can be attached to the bottom wall portion 46 of the case 45.

  Thereafter, the side wall portion 50 of the case 45 is inserted into the connecting wall portion 56 of the airbag cover 52 in the instrument panel 1 mounted on the vehicle, and the locking claws 51 of the case 45 are inserted into the locking holes 57 of the connecting wall portion 56. The locking claws 51 are locked to the connecting wall portion 56. Further, if the bolt 7 is fastened to the nut 49a of each bracket 49 via the mounting seat 6c, the passenger seat airbag device M can be mounted on the vehicle.

  In addition, when the airbag apparatus M is mounted on the vehicle, when the instrument panel 1 is attached to the airbag cover 52 of the instrument panel 1 by attaching the case 45 with the airbag 10 and the inflator 43 attached thereto, the bolt 7 The airbag device M may be mounted on the vehicle by connecting and fixing the airbag device M to the body 1 side.

  If the inflation gas G is discharged from the gas discharge port 43b of the inflator 43 after the airbag device M is mounted on the vehicle, the airbag 10 expands to break the wrapping sheet 38 and the airbag cover 52. , The door portions 53F and 53B are opened as shown by the two-dot chain lines in FIGS. And the airbag 10 protrudes largely from the opening 58 formed by opening the door portions 53B and 53F in the airbag cover 52, completes the expansion, and discharges the excess inflation gas G from the vent hole 22. It will be. 1 and 8 is a windshield.

  In the airbag apparatus M according to the embodiment, as shown in FIG. 8, the airbag 10 includes the portions (head restraint portions 17) of the base fabrics 24 and 26 that form the periphery on the upper end 11 a side of the central hole 11. The inflation is completed so as to face the head H of the occupant P seated in the passenger seat. Therefore, in the airbag apparatus M of the embodiment, the head H of the occupant P interferes with the head restraint portion 17 that is a portion of the base fabrics 24 and 26 that form the periphery of the central hole 11 in the airbag 10. It becomes. When the head H of the occupant P interferes with the head restraint portion 17 in the airbag 10 when the airbag 10 is completely inflated, the head H of the occupant P is entering into the central hole 11. Therefore, it is restrained so as to suppress the forward movement. That is, the head H of the occupant P who has interfered can move so as to enter the lower side of the central hole 11, and the reaction force applied to the head H of the occupant P can be reduced. Therefore, in the airbag apparatus M of the embodiment, the airbag 10 that has been inflated can protect the head H of the occupant P while suppressing the reaction force at the time of interference.

  Therefore, in the passenger seat airbag apparatus M of the embodiment, when the head H of the occupant P interferes with the airbag 10 that has been inflated, the reaction force is suppressed and the occupant P's head H is accurately positioned. Can be protected.

  In the passenger seat airbag apparatus M of the embodiment, the airbag 10 is configured to complete the inflation so that the central hole 11 is closed by the surrounding inflating base cloth 24, so that a predetermined internal pressure is secured. In addition to the restraint of the chest B of the occupant P by the rear inflatable portion 14 disposed at the periphery of the central hole 11, even if the head H of the occupant P interferes with the periphery of the central hole 11, The head H of the occupant P is large and does not enter the central hole 11, and the head H of the occupant P can be restrained accurately while suppressing the reaction force.

  In the passenger seat airbag apparatus M of the embodiment, the chest B of the occupant P is formed by the rear surface 14c (chest restraint surface 29) of the rear inflatable portion 14 that is planar in the airbag 10 that has been inflated. However, since the chest B of the occupant P can withstand a larger reaction force than the head H, even if a slight reaction force is received from the rear inflating portion 14, the chest B is protected without any trouble. The Rukoto.

  Furthermore, in the airbag device M for the passenger seat according to the embodiment, the airbag 10 is configured as an annular body in which the central hole 11 penetrating substantially vertically is disposed. , The inflation gas G flowing in from the gas inlet 20 does not flow directly toward the chest restraint surface 29 side, but once spreads in the left-right direction along the shape of the airbag 10 (annular body 12). (See FIGS. 6 and 9). For this reason, the airbag 10 is inflated so as to spread widely in the left-right direction in a state in which the airbag 10 is prevented from greatly projecting to the rear side.

It is sectional drawing of the vehicle front-back direction of the airbag apparatus for passenger seats which is one Embodiment of this invention. It is a general | schematic expanded sectional view of the vehicle front-back direction of the airbag apparatus of the embodiment. It is the perspective view seen from the front side of the state which expanded the airbag used for the embodiment alone. It is the perspective view seen from the back side of the state where the air bag used for the embodiment was inflated alone. It is sectional drawing of the up-down direction of the state which expanded the airbag used for the embodiment alone. It is sectional drawing of the front-back direction of the state which expanded the airbag used for the embodiment alone, and respond | corresponds to the VI-VI site | part of FIG. It is a top view which shows the member which comprises the airbag used for the same embodiment. It is a figure explaining the time of the action | operation of the airbag apparatus of the embodiment, and is the schematic seen from the side of the vehicle. FIG. 3 is a schematic cross-sectional view showing an initial state of inflation of the airbag when the airbag apparatus of the embodiment is in operation.

Explanation of symbols

1 ... Instrument panel,
10 ... Airbag,
11 ... central hole,
11a ... upper end,
12 ... annular body,
17 ... head restraint part,
20 ... gas inlet,
29 ... Chest restraint surface,
43 ... Inflator,
45 ... Case,
52 ... Airbag cover,
B ... Chest,
G ... expansion gas,
H ... head,
P ... Crew,
M ... Airbag device for passenger seat.

Claims (1)

For passenger seats that are folded and housed in a case placed on the instrument panel in front of the passenger seat and that have an airbag that can protrude from the case toward the rear of the vehicle on the passenger side when inflating gas flows An airbag device,
The airbag is
It is configured as an annular body that arranges a central hole penetrating in a substantially vertical direction and completes expansion so that the central hole is closed by a surrounding swelling base cloth,
When the expansion / expansion is completed, the peripheral base cloth portion on the upper end side of the central hole is arranged so as to be substantially opposed to the head of the passenger seated in the passenger seat. Airbag device for passenger seat.

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