JPH11301385A - Passenger airbag - Google Patents

Abstract

(57) [Problem] To provide a passenger airbag capable of reducing a pressing force on a windshield during deployment and inflation. SOLUTION: An airbag 30 for a passenger seat is provided with an opening 2a of an instrument panel 2 by inflow of an inflation gas.
The doors 28, 28, which cover the vehicle, are opened and protruded upward, and are deployed and inflated to the rear side of the vehicle along the windshield 1. The airbag 30 has a gas inlet 31 that is substantially opposed to the gas inlet 31 when the inflation is completed.
After being folded so as to approach the side, the left and right edges around the inlet 31 are folded so as to approach the center in the left-right direction, and then the front part around the gas inlet 31 The side part 40 is stacked and roll-folded so as to be disposed on the outer peripheral side with respect to the rear part 41, and is housed in the case 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag used in an airbag device for a passenger seat, which is disposed at an instrument panel in front of a passenger seat of a vehicle.
More specifically, the present invention relates to an airbag used in a top-mounted passenger airbag device.

[0002]

2. Description of the Related Art Conventionally, in a top mount type airbag device for a passenger seat, a protruding opening of the airbag is arranged on an upper surface side of an instrument panel below a windshield. Then, the airbag pushes the door covering the opening of the instrument panel by the inflow of the inflation gas, causing the opening provided in the instrument panel to open, and protruding upward from the instrument panel, , And was configured to expand and expand rearward of the vehicle along the windshield.

However, in the airbag used in the conventional top-mounted type passenger airbag device, the airbag is folded and stored in the case of the airbag device as follows (Japanese Patent Laid-Open No. Hei 6-227353). Reference).

That is, in the conventional airbag, first,
At the time of completion of the expansion, the ceiling wall side, which is substantially opposed to the gas inflow port for inflation gas inflow, is folded so as to approach the gas inflow port side. Fold the rim so that it approaches the center in the left-right direction. Then, the front part and the rear part with the gas inlet part in between are folded by roll folding or bellows folding, respectively, so as to approach the center in the front-rear direction, and the folding work is completed. Then, it was stored in the case.

[0005] Therefore, in the airbag used in the conventional top-mounted type passenger airbag device,
At the time of deployment and inflation, the front part and the rear part are separately deployed and inflated. In some cases, the front side portion interferes with the windshield with a strong pressing force during deployment and inflation.

The present invention solves the above-mentioned problems, and
An object of the present invention is to provide a passenger airbag that can reduce a pressing force applied to a windshield during deployment and inflation.

[0007]

An airbag for a passenger seat according to the present invention is folded and housed in a case of an airbag device for a passenger seat disposed at a portion of an instrument panel below a windshield. An airbag for a passenger seat, which opens the door covering the opening of the instrument panel by the inflow of inflation gas, protrudes upward, and deploys and inflates rearward of the vehicle along the windshield, After the airbag is folded so that the ceiling wall side substantially opposite to the gas inflow port for inflation gas inflow when the inflation is completed is close to the gas inflow port side, the airbag is centered around the inflow port. The left and right edges are folded so as to approach the center in the left and right direction, and then the front side portion centering on the gas inlet portion is changed to the rear portion centering on the gas inlet portion. Against sites, such that disposed on the outer peripheral side, and the roll-folded to overlap, characterized in that it is housed in the case.

It is preferable that the front side portion and the rear side portion are roll-folded by bellows-folding the front ends.

[0009]

According to the airbag for a passenger seat according to the present invention,
During inflation and inflation of the airbag, when inflation gas flows in from the gas inlet, the gas inlet is covered near the center of the ceiling wall. The folded portion of the airbag pushes the door in accordance with the rise in the internal pressure of the airbag, further opens an opening provided in the instrument panel, and projects upward from the opening.

In the airbag projecting from the instrument panel, the front part and the rear part tend to deploy and inflate.

At this time, the front side portion is roll-over-folded so as to be disposed on the outer peripheral side with respect to the rear side portion centered on the gas inlet portion, so that the rear side portion is unfolded when deployed. The portion is pulled by the force of deploying to the rear side of the vehicle, the deployment force to the front side of the vehicle is suppressed, and the portion protrudes obliquely rearward. Furthermore, since the front part is roll-folded together with the rear part, during deployment, as it rolls along the inner surface of the windshield that is inclined forward and downward,
The roll folds are unfolded and deployed, making it difficult to apply a pressing force to the windshield in the orthogonal direction.

Therefore, in the passenger airbag according to the present invention, the front portion is deployed by being pulled rearward by the rear portion and deployed along the inner surface of the windshield. Rolling and deploying as if unwinding, the pressing force on the windshield during deployment and inflation can be reduced.

The following operations and effects can be obtained by folding the front side portion and the rear side portion such that the ends are bellow-folded and roll-folded.

That is, in the case of the bellows-fold, the front-side portion and the rear-side portion are roll-folded more rapidly than in the case of the roll-fold.
The time until the inflation of the airbag is completed can be shortened by the portion having the bellows-folded portion.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

A passenger airbag device M1 in which the passenger airbag 30 of the first embodiment shown in FIGS. 1 to 3 is used.
Is a top mount type which is arranged at a portion of an instrument panel (hereinafter abbreviated as an instrument panel) 2 below a windshield 1, and includes a case 5 and an inflator 2.
4, a lid 27, and an airbag 30.

The case 5 is made of sheet metal and has a substantially rectangular parallelepiped main body 6, a diffuser 14, two holding members 15 and 16, a cap 17, and a mounting bracket 19.
And 20.

The main body 6 is welded to the inner peripheral edge of the bottom wall portion 7, the side wall portions 8, 9, 10, 11 extending from the front, rear, right and left of the bottom wall portion 7 and the insertion hole 11b of the right side wall portion 11. And the storage cylinder portion 12 fixed thereto. In the case of the embodiment, the bottom wall portion 7 and the front and rear side wall portions 8 and 9 are formed by bending a single sheet metal, and the main body 6 includes left side wall portions at left and right portions of the bent sheet metal member. 10 and the right side wall portion 11 to which the storage tube portion 12 is assembled are formed by being fixed by welding or the like.

The front and rear side walls 8 and 9 are formed with through holes 8a and 9a through which the rivets 21 are inserted. Each of the through holes 8a and 9a is formed in the front and rear side wall portions 8.9 at a distance of three in the horizontal direction. These through holes 8
The rivet 21 to be inserted into the holding member 15
15 is fixed to the front and rear side wall portions 8 and 9 so that each holding member 1
Parts 32a, 32 before and after a mounting piece part 32 of the airbag 30 interposed between the airbag 30 and the front and rear side wall parts 8, 9
a will be attached to the case 5. The rivet 21 is a so-called blind rivet that can be inserted together with the rivet 22 from one direction to fasten the members.

The left and right side walls 10 and 11 are provided with rivets 2
2, through holes 10a and 11a are formed. Each of the through holes 10a and 11a is connected to the left and right side walls 10.1.
1, two pieces are formed at an interval in a substantially horizontal direction. The rivet 22 inserted into these through holes 10a and 11a has a U-shaped pressing member 16.1.
6 are fixed to the left and right side walls 10 and 11 respectively, and the left and right portions of the mounting piece 32 of the airbag 30 interposed between the pressing members 16 and the left and right side walls 10 and 11. 32b will be attached to the case 5.
When the rivet 22 is fixed, the holding members 16, 16 press the side wall 27 d of the lid 27, which will be described later, with the holding member 15.
The locking claw 15b also serves as a pressing function so as not to come off.

A mounting hole 10b for mounting the inflator 24 is formed in a lower portion of the left side wall portion 10. An insertion hole 11b into which the inflator 24 is inserted is formed in a lower portion of the right side wall portion 11. Further, the storage cylinder portion 12 fixed to the right side wall portion 11 has
Seal part 1 made of soft resin material such as soft polyurethane
2a is formed. The seal portion 12a is pressed against the outer peripheral surface of the inflator 24, and
4 serves to prevent leakage of the inflation gas discharged from 4.

Further, a mounting bracket (not shown) for connecting and fixing the airbag device M1 to the frame of the vehicle is fixed to the bottom wall portion 7 and the front side wall portion 8 of the main body 6.

The diffuser 14 is formed of a sheet metal, has a substantially rectangular plate shape slightly bent near the center in the front-rear direction, and has gas circulation holes 14b at a plurality of predetermined positions for allowing inflation gas to pass therethrough. It is configured. The diffuser 14 is provided with a through hole 14a through which the rivet 21 is inserted at a portion bent downward at the front and rear edges.
They are fixed to the rear side walls 8 and 9.

Each holding member 15 is formed of a substantially rectangular plate-like sheet metal, and has three through holes 15a at its lower portion for being fixed to the front and rear side walls 8, 9 of the main body 6 with rivets 21. Further, a ridge 15c is provided in a position above the through hole 15a in a horizontal direction. Each ridge 15c serves to position the lower end of the side wall 27d of the lid 27. Further, each of the holding members 15 has a plurality of locking claws 15b arranged in the horizontal direction above the ridge 15c. Each locking claw 15
b is cut and raised. The retaining claw 15b is not shown in the pressing member 15 in the vicinity of the front wall portion 8 in FIG. And a locking claw 15b. Each locking claw 15b locks the periphery of a locking hole 27e formed in the side wall 27d of the lid 27, and plays a role of attaching the lid 27 to the case 5.

Each holding member 16 is made of sheet metal, and covers the front side wall 8 or the rear side wall 9 so as to cover the left and right side walls 10 and 11, respectively. Is formed. These holding members 16
Is provided with through holes 16a for inserting the rivets 22 at both ends arranged on the left and right wall portions 10 and 11, and as described above, the left and right portions 32b of the airbag attachment piece 32 are fixed by the rivets 22. Attached to the main body 6,
It serves to press the lid side wall 27d locked by the locking claw 15b so as not to come off.

The mounting brackets 19 and 20 are made of sheet metal and have through holes 19a through which the rivets 22 are inserted.
20a, which is fastened together with the left and right side walls 10 and 11 when the rivet 22 is fastened and attached to the main body 6. These mounting brackets 19 and 20 have bolts 19b and 20b fixed thereto.
By inserting 9b and 20b through the instrument panel 2 and fixing the nut 3, the position of the case 5 and the opening 2a of the instrument panel 2 can be prevented from shifting.

The cap 17 is made of sheet metal and attached to the right side wall 11 using a rivet (not shown) so as to close the insertion hole 11b in the right side wall 11 of the case body 6.

The inflator 24 has a gas discharge port 2 for discharging an inflation gas for inflating the airbag 30.
4b is provided on the distal end side of the main body 24. The male screw 24c is provided at the distal end of the main body 24.
Are formed. The inflator 24 is a cap 1
7, the male screw portion 24c is inserted into the case body 6 through the insertion hole 11b of the right side wall portion 11 with the male screw portion 24c at the head, and the male screw portion 24c is projected from the mounting hole 10b of the left side wall portion 10, The nut 25 is screwed into the nut 24c to be attached and held on the case 5.
In addition, the cap 17 is provided with the inflator 24 in the case 5.
After that, it is attached to the right wall portion 11.

The lid 27 is made of a thermoplastic elastomer such as olefin or styrene, and has a ceiling wall 27a disposed in a rectangular opening 2a of the instrument panel 2, which is opened substantially vertically, and a ceiling wall 27a. And a side wall 27d extending downward from the lower surface of 27a in a square tube shape. On the ceiling wall 27a, on the lower surface of the outer peripheral edge,
A plurality of locking claws 2 for locking to the opening peripheral edge 2b in order to improve the separation between the ceiling wall 27a and the instrument panel 2.
7b is formed. Further, two doors 28, 28 which are opened by breaking the thin portion to be broken 27c when the airbag 30 is inflated, are disposed in the ceiling wall portion 27a inside the side wall portion 27d. Expected break 27c
Is formed in an "H" shape when viewed from above in the front-rear direction of the vehicle, and the two doors 28 are disposed in front and rear of the vehicle. When the airbag 30 is inflated, the door 28 (F) disposed on the front side is opened to the front side, and the door 28 (B) disposed on the rear side is opened to the rear side.

A locking hole 27e is formed in the side wall 27d to lock the periphery with a locking claw 15b provided on the holding member 15 of the case 5.

The airbag 30 is formed in a bag shape having a gas inlet portion 31 in the shape of a square tube, and is formed by sewing a woven fabric made of polyester yarn or polyamide yarn. In addition,
The shape of the airbag 30 when inflated is such that the bag-shaped peripheral wall portion 33 connected to the gas inlet portion 31 is inflated into a substantially truncated quadrangular pyramid shape. In the case of the embodiment, the woven fabric used to form the airbag 30 includes two cloth materials respectively arranged on the left and right side portions when inflated, and the rest thereof, that is, the upper and lower fabric materials when inflated. A total of three sheets are provided, one of which is disposed on the side wall part and the ceiling wall part 34 which is substantially opposed to the gas inlet part 31.

The airbag 30 has a mounting piece 32 provided with a mounting hole 32c for connecting and fixing to the case 5 at the distal end side of the gas inlet port 31. Mounting piece 3
The two front and rear portions 32a, 32a are formed with three mounting holes 32c for inserting the rivet 21, and the left and right portions 32b of the mounting piece portion 32 are inserted into the left and right portions 32b to allow the rivet 22 to be inserted. Each mounting hole 32c is formed.

The folding process of the airbag 30 will be described. First, as shown in FIG. 4A, the airbag 30 is substantially opposed to the gas inlet 31 for inflow of inflation gas at the time of completion of inflation. The ceiling wall 34 side is connected to the gas inlet 3
Fold it so that it approaches one side.

Next, as shown in FIG. 4B, the left and right edges 36 and 37 are folded back to the gas inlet 31.

Thereafter, as shown in FIGS. 4C and 4D, the left and right side edges 38 and 39 of the peripheral wall portion 33 centered on the inflow portion 31 are vertically folded so as to approach the center in the left and right direction. . The fold V of the vertical fold is a fold in the direction along the front-rear direction of the vehicle when the airbag 30 is mounted on the vehicle. In the case of the embodiment, the fold V is folded by bellows fold.

Next, as shown by D and E in FIG. 4, the rear part 41 centered on the gas inlet 31 is overlapped with the front part 40 centered on the gas inlet 31.

Thereafter, as shown by a two-dot chain line in FIG. 4E, the front end 40a of the front side portion 40 is folded over the front end 41a of the rear side portion 41, and in this state, the front end portion 40b
・ Fold the bellows 41b twice, and further,
Is roll-folded so as to be disposed on the outer peripheral side with respect to the rear side portion 41 to complete the folding operation of the peripheral wall portion 33. The bellows fold or roll fold at this time is a horizontal fold, and the horizontal fold H is a fold in a direction along the left-right direction of the vehicle when the airbag 30 is mounted on the vehicle. FIG. 5 shows a state of the front portion 40 and the rear portion 41 after the folding is completed and the vehicle is mounted on the vehicle. The hatched portion is the front portion 40, and the dot portion is the rear portion 41.

After the peripheral wall portion 33 of the airbag 30 is folded in this way, it is housed in the case 5 to assemble the airbag device M1. In this assembling operation, the nut 25 is attached to the case body 6 in advance. Attach the inflator 24 using the cap 17, fit the cap 17,
Further, the diffuser 14 is placed in a predetermined position.

Then, the gas inlet port 31 of the folded airbag 30 is provided on the main body 6 of the case 5 so that the mounting holes 32c are aligned with the through holes 8a, 9a, 10a, and 11a. Through holes 1 in holes 32c, 8a and 9a
The diffuser 14 can be fixed to the case body 6 by arranging the holding members 15 and 15 so that the 5a is aligned and inserting and fastening the rivets 21 so as to penetrate the holes 32c, 8a, 9a and 15a. At the same time, the front and rear portions 32 a of the attachment piece 32 of the airbag 30 can be attached to the main body 6.

In the case of the embodiment, since the mounting piece 32 of the airbag 30 is externally fixed to the case body 6, when the airbag 30 is stored in the case body 6, the vicinity of the mounting piece 32 is The gas inlet 31 has side walls 8.9.10.11.
From the upper edge of the diffuser 14 to the side wall 8.
A folded portion 43 is provided along the inner surface of 9, 10, 11, and the peripheral wall portion 33 of the airbag 30 is housed above the diffuser 14 in the case body 6.

Further, the side wall 27d of the lid 27 is externally covered, and the locking claw 1 of the pressing member 15 is provided on the periphery of each locking hole 27e.
5b is locked, and then the holding members 16, 16 and the mounting brackets 19, 20 are arranged so that the through holes 16a, 19a, 20a coincide with the holes 32c, 10a, 11a. If the rivet 22 is inserted and fastened so as to penetrate the main body 6, the right and left portions 32 b of the mounting piece 32 of the airbag 30 are attached to the main body 6 together with the mounting brackets 19 and 20 and the lid 27. It can be attached, and the airbag device M1 can be assembled.

After that, the locking claw 27b of the lid 27
To the opening peripheral edge 2b of the instrument panel 2, the bolts 19b and 20b of the mounting brackets 19 and 20 are fixed to the nut 3 of the opening peripheral edge 2b of the instrument panel 2, and a bracket (not shown) extending from the case 5 is attached to the frame of the vehicle. By connecting and fixing, as shown in FIG. 1, the airbag device M1 can be mounted on a predetermined portion of the instrument panel 2.

If the inflation gas is discharged from the gas discharge port 24b of the inflator 24 after the airbag device M1 is mounted on the vehicle, the inflation gas is discharged from the gas inlet port 31 when the airbag 30 is deployed and inflated. When the gas flows in, the gas inlet port 31 is covered near the center portion 34a of the ceiling wall portion 34. Therefore, first, the vicinity of the center portion 34a of the ceiling wall portion 34 and the overlapped folded portion near the center portion 34a As the internal pressure rises, the ceiling wall 27 of the lid 27 is pushed.

As a result, the rupture portion 27c of the lid 27 is ruptured, and the doors 28 open back and forth, and the airbag 3
0 protrudes upward from the opening 2a of the instrument panel 2 as shown in FIG. At this time, the airbag 30 of the embodiment
The folded peripheral wall portion 3 extends while the folded portion 43 extends.
3 protrudes from the opening 2a.

The peripheral wall portion 33 of the airbag 30 protruding from the instrument panel 2 includes a front portion 40 and a rear portion 4.
1 tries to expand and inflate.

At this time, the front part 40 is connected to the rear part 4.
6 is roll-folded so as to be disposed on the outer peripheral side, so that when deployed, as shown in FIGS. As a result, the deployment force to the front side of the vehicle is suppressed, and the vehicle protrudes obliquely rearward. Further, the front part 40 is
Since the windshield 1 is roll-folded together with the rear portion 41, the windshield 1 is unfolded and rolled so as to roll along the inner surface of the windshield 1 inclined forward and downward when deployed. , It is difficult to apply a pressing force in a direction perpendicular to the direction.

After that, when the roll folding is eliminated, FIG.
As shown in D, E, F, and G, the bellows fold is sequentially eliminated, and the airbag 30 is greatly inflated.

Therefore, in the passenger airbag 30 of the first embodiment, the front portion 40 is pulled toward the rear of the vehicle by the rear portion 41 and is deployed, and along the inner surface of the windshield 1. In addition, since it rolls and unfolds so as to unwind the rolled state, it is possible to reduce the pressing force on the windshield 1 at the time of unfolding and expanding.

In the airbag 30 of the embodiment,
The front side portion 40 and the rear side portion 41 are folded so that the front end portions 40b and 41b are bellows-folded and roll-folded at the time of lateral folding.

That is, in the case of the bellows-fold, the front-side part 40 and the rear-side part 41 are folded in a bellows manner because the front part 40 and the rear part 41 are all roll-folded more quickly than the roll-fold. Because of having the parts 40b and 41b,
The time until the inflation of the airbag 30 is completed can be shortened.

In the airbag 30 according to the first embodiment, the folded portion 43 is provided in the case 5 so as to be slackened. However, the airbag 30 according to the second embodiment shown in FIGS. As in the case of 30A, the folded portion 43 may not be provided and may be stored in the case 5.

The airbag 30A of the second embodiment is
In addition to partially shortening the gas inlet portion 31 so that portions 32a and 32a of the gas inlet portion 31 of the airbag 30 of the first embodiment before and after the attachment piece 32 approach the peripheral wall portion 33 side, It has the same shape as the airbag 30 of the first embodiment, and is folded in the same manner as the first embodiment. After the airbag 30A is folded, the attachment pieces 32 are attached to the case body 6 using the rivets 21 and 22. However, the mounting piece 3
2 are fixed between the diffuser 14 and the front and rear side walls 8 and 9, and the left and right parts (not shown) of the mounting piece 32 are the left and right side walls as in the first embodiment. The parts 10 and 11 are attached to the case body 6 by rivets 22. And this airbag 30A
Are the same as in the first embodiment except that the mounting portions are different as described above, and the case 5, the inflator 24, and the lid 2
7 and the like.

In the airbag 30A of the second embodiment, when the airbag 30A is deployed and inflated after being mounted on the vehicle, as shown in FIG.
Since a is shorter by eliminating the folded portion 43 of the first embodiment, the upwardly protruding distance L (see FIG. 6) at the initial stage of expansion in which the folded peripheral wall portion 33 protrudes from the opening 2a,
The length of the windshield 1 can be reduced, and the pressing force on the windshield 1 can be further reduced.

It should be noted that such an operation and effect can be obtained from the portion 31a on the front side of the vehicle in the gas inlet portion 31 of the airbag 30 of the first embodiment, that is, from the portion attached to the case 5 to the peripheral wall portion 33. Since the distance may be shortened, as shown in an airbag 30B shown in FIG.
The length of the gas inlet 3
1 may be provided on the case body 6 so as to be fixed to the rivets 21 and 22. Also in this airbag 30B, if the airbag 30B is folded and attached to the vehicle in the same manner as in the first embodiment, a portion 31 on the front side of the vehicle in the gas inlet port 31 is provided.
Since a is shorter by eliminating the folded portion 43 of the first embodiment, the upwardly protruding distance L (see FIG. 6) at the initial stage of expansion in which the folded peripheral wall portion 33 protrudes from the opening 2a,
The pressing force on the windshield 1 can be further reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a use mode of an airbag device in which a passenger airbag according to one embodiment of the present invention is used.

FIG. 2 is a left side view of the airbag device in which the embodiment is used.

FIG. 3 is a sectional view taken along a line III-III in FIG. 2;

FIG. 4 is a diagram illustrating a folding step of the embodiment.

FIG. 5 is a cross-sectional view showing a front portion and a rear portion of the airbag of the embodiment in a state where folding is completed.

FIG. 6 is a diagram showing the airbag of the embodiment when it is deployed and inflated.

FIG. 7 is a cross-sectional view showing a use mode of an airbag device using the airbag of the second embodiment.

FIG. 8 is a cross-sectional view showing a front portion and a rear portion of the airbag according to the embodiment in a state where folding is completed.

FIG. 9 is a diagram showing the airbag of the embodiment at the time of deployment and inflation.

FIG. 10 is a cross-sectional view showing a use mode of an airbag device using an airbag of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Windshield, 2 ... Instrument panel, 2a ... Opening, 5 ... Case, 30 / 30A / 30B ... Airbag, 31 ... Gas inlet, 34 ... Ceiling wall, 40 ... Front part, 40b ... Tip 41: Rear portion 41b: Tip M1, M2: Airbag device for passenger seat.

Continued on the front page (72) Inventor Yuji Kuriyama 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (72) Inventor Yasushi Okada Yasushi Ochiai, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Toyota Gosei Co., Ltd. (72) Inventor Yama ▲ Saki ▼ Yukihiko 1 Toyota Town, Toyota City, Aichi Prefecture Inside

Claims (2)

[Claims] 1. An airbag device for a passenger seat, which is disposed at a portion of an instrument panel below a windshield and is folded and housed, and an opening of the instrument panel is opened by inflow of an inflation gas. An airbag for a passenger seat which opens a covered door, projects upward, and is deployed and inflated rearward of the vehicle along the windshield, wherein the airbag is used for inflow of the inflation gas when inflation is completed. After being folded so that the ceiling wall portion side substantially opposite to the gas inlet portion approaches the gas inlet portion side, the left and right edges around the inlet portion approach the central side in the left-right direction. Then, the front side portion around the gas inlet portion is
An airbag for a passenger seat, wherein the airbag for a passenger seat is overlapped and roll-folded so as to be disposed on an outer peripheral side with respect to a rear side portion centered on the gas inlet portion and housed in the case. 2. The method according to claim 1, wherein a front end of the front part and a rear part of the rear part are bellows-folded, and the front part and the rear part are roll-folded. Passenger airbag described.