JP2001354097A - Air bag system for front passenger seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag system for a front passenger seat, capable of reducing the thrust of an air bag against an occupant during interference with the occupant before completing inflation. SOLUTION: The air bag system for the front passenger seat comprises the air bag 10 folded and stored in a case and adapted to come out of an instrument panel while forcibly opening a door thereof during development and inflation. The air bag has a front wall portion 13 folded in a bellows form and left and right wall portions 15, 16 folded in a sector form in such a manner that an occupant side wall portion 14 approaches a lower wall portion 12, in consideration of its form at completing inflation, to form front and rear side folded portions 23, 24 flatly folded. Then, the front-side folded portion is folded in such a manner as to approach a gas inflow port 12a and the rear-side folded portion is internally folded to be rolled downward from a rear end 24a and stored in the case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device for a passenger seat which is disposed at a position of an instrument panel in front of a passenger seat of a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a passenger airbag apparatus, when a folded airbag is deployed and inflated, the airbag pushes open a door arranged on an instrument panel, protrudes, and tilts forward and downward. Along the windshield that had been deployed, and expanded and expanded toward the rear of the vehicle.

[0003] However, before the inflation is completed, there is a case where it is desired to reduce the pressing force of the airbag toward the occupant when the occupant interferes with the occupant located ahead of the predetermined position.

[0004] It is an object of the present invention to provide an airbag device for a passenger seat which can reduce the pressing force of the airbag to the occupant when the occupant interferes with the occupant before the inflation is completed.

[0005]

According to the airbag device for a passenger seat according to the present invention, when an airbag folded and stored in a case is deployed and inflated, an inflation gas flows from a gas inflow port, An airbag device for a passenger seat, which pushes open and protrudes a door disposed on an instrument panel and expands and inflates to the rear side of the vehicle, wherein the airbag is arranged on a lower side as a shape when deployment and inflation is completed. A lower wall portion in which the gas inlet is disposed on the front side and the peripheral edge of the gas inlet is attached to the case; a front wall portion extending obliquely rearward to the front end side of the lower wall portion; An occupant side wall portion connected to the rear end side of the wall portion / front wall portion and disposed on the occupant side, and left and right sides of the airbag connected to the lower wall portion, the front wall portion, and the occupant side wall portion. With a left wall and a right wall, It is folded and housed within the case,
The folding step of the airbag in the first stage is a bellows-folding of the front wall portion so that an upper end side of the front wall portion approaches a lower end side of the front wall portion from a shape at the time of completion of deployment and inflation. The left and right walls are connected to the occupant side wall and the lower wall, respectively, such that the left and right sides of the occupant side wall approach the left and right sides of the lower wall, respectively. As a step of forming two front and rear folded portions that are folded flat, from the vicinity of the center of the gas inlet, to the vicinity of the part as the center of the fan, from the vicinity of the center of the gas inlet, the front side and the rear side, The step of folding the airbag in the second step is a step of folding the front folded portion so as to approach the gas inlet and folding the rear folded portion downward from the rear end side with an inner roll. It is special that To.

[0006] Before the fan-folding of the left wall portion and the right wall portion of the airbag, the fan-folding fan is formed so that the lower end portion of the occupant side wall portion is continuous with the lower wall portion. It is preferable that the center of the airbag be shifted toward the side wall of the occupant and the airbag be fan-folded.

[0007] It is preferable that the airbag is housed in the case with the front folded portion disposed above or in front of the rear folded portion.

Note that the front, rear, left and right directions in this specification are based on the direction of the vehicle on which the vehicle is mounted traveling straight ahead.

[0009]

In the passenger airbag apparatus according to the present invention, when the inflation gas flows into the airbag from the gas inlet, the internal pressure of the airbag increases, and the airbag is disposed on the instrument panel. The door is pushed open, protrudes from the instrument panel, and expands by expanding the front folded portion and the rear folded portion.

At this time, in the first stage folding step of the airbag, the upper end side of the front wall portion is made to approach the lower end side.
The front wall portion is folded in a bellows, and the left and right wall portions are connected to the occupant side wall portion and the lower wall portion, respectively, so that the left and right sides of the occupant side wall approach the left and right sides of the lower wall portion, respectively. The fan is folded so that the vicinity of the connection part is the center of the fan,
The rear folded portion is longer than the front folded portion, and the ratio of the rear folded portion to the entire airbag is large. That is, at the time of deployment and expansion protruding from the instrument panel, the front folded portion immediately completes the deployment and expansion on the windshield side, and the rear folded portion releases the downwardly wound inner roll folded state while the vehicle is unfolded. It will expand and expand backward.

Therefore, even if it interferes with the occupant before the deployment and inflation of the airbag is completed, the portion that interferes with the occupant is the rear folded portion of the airbag, and the rear folded portion is directed downward from the rear end side. Since the inner roll is folded by the inner roll fold, when it interferes with the occupant, the inner roll is deployed downward along the occupant so as to release the inner roll fold, and the pressing force on the occupant can be reduced. Thereafter, in a state in which the rear folded portion has unwound the inner roll, that is, in a state in which the occupant side wall is widely deployed along the occupant, the occupant side wall moves toward the vehicle rear side so as to eliminate fan folding. Therefore, unlike the case where the occupant side wall portion moves locally to the rear side of the vehicle, the occupant restrains the occupant in a large area and moves to the rear side, and the pressing force per unit area to the occupant is reduced. It can be kept low.

Therefore, in the airbag device for the passenger seat according to the present invention, even if the airbag protruding from the instrument panel interferes with the occupant before the inflation is completed, the airbag deploys downward along the occupant. The pressing force on the occupant immediately after can be reduced, and even when moving backward after interference,
The pressing force per unit area to the occupant can be kept low.

Before the fan-folding of the left and right walls of the airbag, the center of the fan-folding fan is connected to the passenger side wall so that the lower end of the passenger side wall is connected to the lower wall in a plane. If the airbag is displaced toward the side and fan-folded, the length of the rear folded portion can be further increased, and the ratio of the rear folded portion of the entire airbag further increases, and the rear folded portion becomes Therefore, it is possible to more accurately interfere with the occupant located on the front side before the completion of the deployment and inflation.

When the front folded portion is arranged above the rear folded portion and the airbag is housed in the case, the door to be pushed open is a single-opening type having a hinge portion on the front edge side. It is suitable for an airbag device for a seat, and when the front folded portion is arranged in front of the rear folded portion and the airbag is stored in the case, two doors that open and are provided are provided, and the doors are moved in the front-rear direction. This is suitable for a passenger seat airbag device of a double-opening type.

[0015]

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

An airbag device M for a passenger seat according to the first embodiment
1 is a top mount type arranged on the upper surface 1a side of an instrument panel (hereinafter abbreviated as instrument panel) 1 as shown in FIG. This airbag device M1 is
As shown in FIG. 2, a folded airbag 10 and an inflator 3 for supplying an inflation gas to the airbag 10.
0, a case 32 for housing and holding the airbag 10 and the inflator 30, a retainer 28 for attaching the airbag 10 to the case 32, an airbag cover 43 for covering the folded airbag 10, and an airbag cover 43. And two holding plates 41 for firmly connecting to the case 32.

The retainer 28 for attaching the airbag 10 to the case 32 is formed of a square annular sheet metal and includes a plurality of bolts 28a extending downward at predetermined positions. The retainer 28 attaches each bolt 28a to the airbag 1
0 and a bottom wall 35 and a horizontal plate 41 of the case 32 and the holding plate 41 which will be described later.
a, and the nut 28b is screwed into each bolt 28a to be attached to the case 32.

The inflator 30 is of a cylinder type and is housed and held in a lower chamber 37 of the case 32 which will be described later.

The airbag cover 43 is made of a thermoplastic elastomer such as polyolefin or polyester, and is provided with a ceiling wall portion 44 arranged to close the rectangular opening 2 of the instrument panel 1, and a ceiling wall portion 44. And a substantially rectangular cylindrical side wall portion 45 extending downward from the lower surface of the portion 44. The ceiling wall portion 44 has a thin wall portion 44c thinly disposed around the inside surrounded by the side wall portion 45 and a door 44a. Expected break 44c
Are arranged in a substantially U-shape when viewed from above the ceiling wall portion 44 (see FIG. 1), and when the airbag 10 is inflated and ruptured, the front edge side of the door 44a is hinged to the hinge portion 44b.
As a result, the door 44a is opened toward the front of the vehicle as shown by the two-dot chain line in FIG. In addition, the ceiling wall 44
A plurality of locking legs 44d projecting downward are formed on the front and rear edges of the vehicle. Each locking leg 44d is locked on the lower surface side of the flange portion 3 provided with a step on the periphery of the opening 2 of the instrument panel 1. On the side wall 45,
A plurality of locking holes 45a penetrating in the front-rear direction of the vehicle are formed at portions opposed to each other in the front-rear direction of the vehicle, and the side walls 45 are formed by using these locking holes 45a and the holding plate 41.
Is connected to an upper chamber 33 of the case 32 which will be described later.

The holding plate 41 is formed of sheet metal and has an L-shaped cross section having a horizontal plate portion 41a and a vertical plate portion 41b extending upward from an end of the horizontal plate portion 41a.
2 are respectively arranged on both sides in the vehicle front-rear direction. A through hole (not shown) for inserting each bolt 28a of the retainer 28 is formed in each horizontal plate portion 41a, and an upper end of each vertical plate portion 41b is inserted into a later-described locking projection 34a of the case 32. It is formed to be possible.

The case 32 is made of sheet metal and has a rectangular parallelepiped upper chamber 33 having an upper opening, and a lower chamber 37 disposed on the lower side of the case 32 so as to communicate with the upper chamber 33.
And, it consists of.

The upper chamber 33 accommodates the folded airbag 10.
And a peripheral wall portion 34 having a substantially rectangular tube shape,
And a bottom wall portion 35 arranged below the peripheral wall portion 34. On the peripheral wall portion 34, a locking projection 34a inserted into each locking hole 45a of the airbag cover side wall portion 45 is provided.
It is formed so as to protrude outward. In the bottom wall portion 35, through holes (not shown) for inserting the bolts 28a of the retainer 28 are formed, and on the lower surfaces on both sides in the vehicle front-rear direction, horizontal plate portions 41a of the holding plate 41 are respectively provided. It will be arranged in contact.

The lower chamber 37 has a substantially rectangular cylindrical peripheral wall 38 extending downward from the inner end of the bottom wall 35, and a bottom wall 39 closing the lower end of the peripheral wall 38. ing. A nut 39 a for attaching the case 32 to the body 5 is attached to the bottom wall portion 39. The bottom wall 39 is attached to a bracket 5b extending from the reinforcement 5a on the body 5 side.
It is attached to the bracket 5b by being screwed into a nut 39a through a connection hole (not shown) provided in the bracket 5b.

As shown in FIGS. 3 and 4, the airbag 10 has a shape of a substantially triangular prism having an axis in the left-right direction of the vehicle when deployed and inflated. That is, in the case of the embodiment, the airbag 10 is configured such that the peripheral wall 1 that is inflated during deployment and inflation is provided.
1, a lower wall 12 disposed on the lower side, a front wall 13 extending obliquely rearwardly to the front end of the lower wall 12 and connecting the lower wall 12 and the rear end of the front wall 13 to each other. Occupant side wall 1
4 and a left wall portion 15 connected to the lower wall portion 12, the front wall portion 13, and the occupant side wall portion 14 to block the left and right sides of the airbag 10.
And a right wall portion 16. Airbag 1
0, the lower wall portion 12 is located on the upper surface 1 a of the instrument panel 1.
From the rear surface 1b side, the front wall portion 13 is disposed on the windshield S side, the occupant side wall portion 14 is disposed on the occupant side, and the left and right wall portions 15 and 16 are disposed on the airbag 1 side.
Windshield S and instrument panel 1 on both left and right sides
And will be arranged between them.

The lower wall 12 has a substantially rectangular gas inlet 12a formed on the front side thereof for allowing inflation gas to flow into the airbag 10.
A plurality of mounting holes 12b are penetrated in the periphery of a.
Each of the bolts 2 of the retainer 28 is
8a is inserted, and the periphery of the gas inlet 12a is
2 will be attached to the bottom wall 35.

Further, the left wall portion 15 and the right wall portion 16 include
Vent holes 1 for exhausting excess inflation gas
7 are formed.

The peripheral wall 11 of the airbag 10 is formed by sewing a predetermined number of flexible cloth materials woven from yarn such as polyester or polyamide. The number of cloth materials may be one or more, depending on the cut shape,
Also, the cutting shape of the cloth material is arbitrary, and
The shape does not have to be the same as that of 14, 15, and 16.

In the peripheral wall 11 of the airbag 10,
A substantially rectangular rectifying cloth 1 so as to cover the gas inlet 12a.
9 are provided. The rectifying cloth 19 is formed of the same material as the peripheral wall 11, and is sewn on both left and right sides to the peripheral edge of the gas inlet 12 a, so that the inflation gas flowing into the airbag 10 can be interposed between the peripheral wall 11 and the vehicle front-rear direction. The gas flow holes 20 and 21 flowing on both sides are formed.

The mounting of the airbag 10 on a vehicle will be described. First, the airbag 10 is mounted in two stages with the retainer 28 disposed inside so that the bolt 28a projects from each mounting hole 12b. Fold in the process.

In the first stage of the folding process, first, the upper end 13a of the front wall 13 is moved toward the lower end 13b of the front wall 13 as shown in FIGS. A fold fold VFM of a mountain fold and a fold VFV of a valley fold are provided so as to be close to each other, and the front wall 13 is bellow-folded, and the left and right sides of the occupant side wall 14 are respectively provided on the left and right sides of the lower wall 12. The left wall 15 and the right wall 16
Respectively, so that the vicinity of the connecting portion between the occupant side wall portion 14 and the lower wall portion 12 is the center C0 of the fan.
FM and fold FFV of valley fold are provided and fan-folded.
As shown in A, two flat front and rear folded portions 23 and 24 are formed from the vicinity of the center of the gas inlet 12a, that is, the front side and the rear side.

When the fan folding is completed, as shown in FIG. 6A, the valley fold VFV in the bellows fold of the front wall portion 13 is divided into left and right wall portions on both sides in the left-right direction. 1
The fold FFM of the mountain fold in the fan fold of 5/16 and the valley fold FFV of the valley fold in the fan fold of the left and right wall portions 15 and 16 are continuous with the fold of the mountain fold in the bellows fold of the front wall portion 13. The shape is such that it extends to the top of the eye VFM.

When the first-stage folding process is completed, the width dimension W in the left-right direction is set so that the first-stage folding process can be easily stored in the case upper chamber 33 after the completion of the second-stage folding process.
However, it is folded to a size slightly smaller than the width in the left-right direction on the inner peripheral side of the case upper chamber 33.

Further, in the case of the embodiment, as shown in FIGS. 5A and 5B, the left wall portion 15 and the right wall portion are so arranged that the length L1 of the rear folded portion 24 in the vehicle front-rear direction becomes longer. Before the fan folding with the portion 16, the lower wall portion 12 is formed so that the vicinity of the lower end 14 b of the occupant side wall portion 14 is connected to the lower wall portion 12 in a plane.
(At this time, the upper end 14a of the occupant side wall portion 14 is lowered, and the vicinity of the upper end 13a of the front wall portion is connected to the occupant side wall portion 14 in a planar manner.) The airbag 10 is fan-folded while being shifted to the 14 side.

In the folding step of the airbag 10 in the second stage, as shown in FIGS. 7B and 7C, the rear folded portion 24 is folded inward from the rear end 24a side by inner roll folding. The front folded portion 23 is folded so as to approach the gas inlet 12a. In the case of the embodiment, the front folded portion 23 is folded in a bellows as shown in FIG. 7D. Incidentally, as shown in FIG. 7E, the front-side folded portion 23 may be folded back into an outer roll shape in which the front end 23a is folded inward.

Further, in the first embodiment, when the second-stage folding process is completed, the rear folded portion 24 is disposed immediately above the gas inlet 12a while the front folded portion 2 is placed.
3 is arranged above the rear folding portion 24 to shorten the length dimension L0 in the front-rear direction, and store the case upper chamber 3.
3 and 3.

After the completion of the second-stage folding, the folded airbag 10 is wrapped with a breakable wrapping sheet (not shown) so as not to be broken.

After the folding of the airbag 10 is completed, the inflator 30 is placed in the lower chamber 37 of the case 32.
And retain each bolt 2 of the retainer 28.
The folded airbag 10 is housed in the upper chamber 33 so that 8 a protrudes from each bottom wall 35 of the case 32, and the side wall 45 of the airbag cover 43 is externally provided in the upper chamber 33 from above. , Each locking hole 45 of the side wall portion 45
The locking projection 34a of the peripheral wall portion 34 is inserted into a.

Next, the upper end of each vertical plate portion 41b is inserted into the locking projection 34a protruding from the side wall portion 45, and the bolt 28a is inserted into each horizontal plate portion 41a. By disposing the plates 41 and further screwing the nuts 28b to the bolts 28a,
The airbag device M1 can be assembled.

The passenger-side airbag device M1 assembled as described above is inserted through the opening 2 of the instrument panel 1 assembled to the vehicle, and each of the locking legs 44d is locked to the flange portion 3. If the bolt 32 is screwed into the nut 39a via the bracket 5b, and the case 32 is connected to the body 5, it can be mounted on a vehicle.

After the inflation gas is discharged from the inflator 30 after the airbag device M1 is mounted on the vehicle, the airbag 10 is inflated to break a wrapping sheet (not shown), and the airbag 10 shown in FIG. 9, AB and FIG. 10A and 10B, the to-be-ruptured portion 44c of the airbag cover 43 is broken, and the door 44a is pushed open to the front of the vehicle to open the upper chamber of the case. 33 and the instrument panel opening 2, and the front folded portion 23 and the rear folded portion 24 are expanded and expanded.

At this time, in the first-stage folding step of the airbag 10, the front wall 13 is bellow-folded so that the upper end 13a of the front wall 13 approaches the lower end 13b, and the occupant side wall 14 Left and right wall portions 16 and 16 so that the left and right sides of the lower wall portion 12 approach the left and right sides of the lower wall portion 12, respectively.
Are fan-folded such that the vicinity of the connection between the occupant side wall portion 14 and the lower wall portion 12 is the center C0 of the fan, and the length dimension L1 of the rear-side folded portion 24 is equal to the front-side folded portion. 23, which accounts for a large proportion of the entire airbag 10. For this reason, as shown in FIGS. 8B and 9A, the front folded portion 23 immediately completes the deployment and inflation on the windshield S side when the deployed and inflated projecting from the instrument panel 1, and the rear folded portion 24 is unfolded. , FIG. 9B, FIG. 1
As indicated by A and B in FIG. 0, the inner roll is unfolded downward and unfolded, and expands and expands toward the rear of the vehicle.

Therefore, as shown in FIGS. 11A and 11B,
Even if the occupant P interferes with the occupant P before the deployment and inflation of the airbag 10 is completed, the portion that interferes with the occupant P becomes the rear folded portion 24 of the airbag 10 and the rear folded portion 24.
Is folded by an inner roll folded downward from the rear end 24a side, so that when it interferes with the occupant P, as shown in FIG. 11B and FIG. It deploys downward along the occupant P, and the pressing force on the occupant P side can be suppressed low. Then, in a state where the rear folded portion 24 is unwound from the inner roll, that is, in a state where the occupant side wall portion 14 is widely deployed along the occupant P, FIG.
As shown in FIG. 2B, the occupant side wall portion 14 moves to the vehicle rear side so as to cancel the fan folding. As a result, the occupant side wall portion 14 is different from moving locally to the vehicle rear side,
The occupant P is restrained in a wide area and moves rearward, so that the pressing force per unit area on the occupant P can be reduced.

Therefore, in the passenger airbag device M1 of the first embodiment, even if the airbag 10 protruding from the instrument panel 1 interferes with the occupant P before the inflation is completed, it deploys downward along the occupant P. Accordingly, the pressing force on the occupant P immediately after the interference can be reduced, and the pressing force per unit area on the occupant P can be suppressed even when moving backward after the interference.

In the case of the embodiment, the airbag 1
0, the rectifying cloth 19 that branches the inflation gas flowing in the vehicle front-rear direction and flows the rearward folded portion 24 is provided on the rear surface 1b of the instrument panel 1 without interfering with the occupant P. The occupant is moved rearward in a state where the occupant side wall portion 14 is deployed in a wide area (see FIG. 9B and FIG. 10A).

In the case of the first embodiment, before the fan-folding of the left wall portion 15 and the right wall portion 16 of the airbag 10, the vicinity of the lower end 14 b of the occupant side wall portion 14 is made flat with the lower wall portion 12. Since the center C0 of the fan of the fan folding is shifted toward the occupant side wall portion 14 so as to be continuous, the airbag 10 is fan-folded, and the length dimension L1 of the rear folded portion 24 is lengthened. The ratio of the rear folded portion 24 of the entire 10 becomes large, and the rear folded portion 24 can more accurately interfere with the occupant P located on the front side before the completion of the deployment and inflation.

Further, in the first embodiment, the case upper portion 33 is arranged such that the front folded portion 23 is arranged above the rear folded portion 24 and the folded portions 23 are arranged substantially in a line in the vertical direction. Is housed inside. Therefore, when the inflation gas of the airbag 10 flows, the folded portions 23 and 24 become one lump, and the case upper chamber 3
3, the door 44 a that is pushed open by the airbag 10 is a single-sided single-panel airbag device M <b> 1 having a hinge portion 44 b on the front edge side.
It becomes suitable.

Of course, like the airbag device M2 for a passenger seat of the second embodiment shown in FIGS.
The front folded part 23 of A may be arranged in front of the rear folded part 24, and the folded parts 23 and 24 may be arranged substantially in a line in the vehicle longitudinal direction.

The case 32A of the airbag device M2
The upper chamber 33 accommodating the airbag 10A is elongated in the front-rear direction of the vehicle, and the ceiling wall 44 of the airbag cover 43A covering the upper chamber 33 is provided with two doors 44a that open in the vehicle front-rear direction. Further, the front folded portion 23 of the airbag 10A is
The first embodiment is the same as the first embodiment except that it is arranged in front of the first embodiment. The same reference numerals are given to the same members, and the description thereof is omitted.

In the second embodiment, the door 44a
As shown in FIGS. 14 and 15, a breakable portion 44c having a substantially H-shape when viewed from above is disposed around the door 44a.
4a (F) has the hinge portion 44b disposed on the front edge side, and the vehicle rear door 44a (B) has the hinge portion 44b disposed on the rear edge side, and is set to open in the vehicle front-rear direction. ing.

The folding of the airbag 10A is the same as that of the first embodiment, except that the front folded portion 23 is disposed in front of the rear folded portion 24 in the second stage folding step.

That is, with the retainer 28 disposed inside, the upper end 13a of the front wall 13 is moved closer to the lower end 13b of the front wall 13 in the first stage from the shape at the time of completion of the expansion and inflation. The left wall 15 and the right wall 16 are respectively occupied so that the front wall 13 is folded in a bellows and the left and right sides of the occupant side wall 14 approach the left and right sides of the lower wall 12, respectively. The front side and the front side of the gas inlet 12a are folded flat so that the vicinity of the connection portion between the lower wall part 14 and the center is the center C0 of the fan. The rear folded portions 23 and 24 are formed. At this time, the rear folded portion 24 is elongated,
Before the folding, the center C0 of the folding fan is arranged so that the vicinity of the lower end 14b of the occupant side wall 14 is connected to the lower wall 12 in a plane.
Is shifted toward the occupant side wall portion 14 and the airbag 10A is fan-folded (see FIG. 5).

Then, as shown in FIGS. 13A, 13B and 13C, in the folding step in the second stage, the rear folded portion 2
4 is folded in an inner roll wound downward from the rear end 24a side,
The front folded portion 23 is folded in a bellows so as to approach the gas inlet 12a, and is disposed in front of the rear folded portion 24. The folding of the front folded portion 23 may be an outer roll fold or an inner roll fold as shown in FIG. 13D.

Then, the folded airbag 10A is completed.
As in the first embodiment, the airbag device M2 may be wrapped with a wrapping sheet (not shown), disposed in the upper chamber 33 of the case 32A, assembled into the airbag device M2, and then mounted on the vehicle.

After mounting on the vehicle, the gas inlet 12
a, the inflation gas flows into the airbag 10A from
Similarly to the first embodiment, the airbag 10A pushes and opens the doors 44a, 44a arranged on the instrument panel 1, protrudes from the instrument panel 1, expands the front folded portion 23 and the rear folded portion 24, and inflates. (Fig. 16
AB of FIG. 17, AB of FIG. 17, and AB of FIG. 18).

At this time, also in the airbag device M2, the front wall 1
3 so that the upper end 13a side approaches the lower end 13b side,
The left wall 15 and the right wall 16 are respectively connected to the occupant side wall 14 such that the front wall 13 is folded in a bellows and the left and right sides of the occupant side wall 14 approach the left and right sides of the lower wall 12 respectively. The center of the fan is near the connecting part of the fan and the lower wall 12.
Fan folding so that it is set to 0, and the rear folding part 2
4 is longer than the front folded portion 23 and the airbag 10
A, which accounts for a large proportion of the whole A,
In this case, the deployment and inflation are completed immediately on the windshield S side, and the rear folded portion 24 is deployed and inflated to the rear side of the vehicle while unfolding the inner roll folded downward.

Therefore, as shown in FIGS.
Even if the occupant P interferes with the occupant P before the deployment and inflation of the airbag 10A is completed, the portion that interferes with the occupant P becomes the rear folded portion 24 of the airbag 10A and the rear folded portion 2
19 is folded by an inner roll folded downward from the rear end 24a side.
B. As shown in FIG. 20A, the inner roll is unfolded downward along the occupant P so as to release the roll fold, and the pressing force on the occupant P side can be suppressed low. Then, in a state where the rear folded portion 24 is unwound from the inner roll, that is, in a state where the occupant side wall portion 14 is widely deployed along the occupant P, fan folding is canceled as shown in FIG. 20B. Then, the occupant side wall portion 14 moves to the vehicle rear side. As a result, unlike the case where the occupant side wall portion 14 locally moves to the vehicle rear side, the occupant P is restrained with a large area and moves to the rear side, and the occupant P per unit area per unit area is moved. The pressing force can be kept low, and the same operation and effect as in the first embodiment can be obtained.

Further, in the second embodiment, the front folded portion 23 is arranged in front of the rear folded portion 24, and the folded portions 23 and 24 are arranged substantially in a line in the front-rear direction. It is stored in the upper chamber 33. Therefore, when the inflation gas flows into the airbag 10A, the folded portions 23 and 24 are connected to the two doors 44 arranged in the vehicle front-rear direction of the airbag cover 43A.
a.44a can be pushed open properly and the door 44
This is suitable for a double-sided airbag device M2 for a front passenger seat that opens the front a.44a in the front-rear direction.

[Brief description of the drawings]

FIG. 1 is a perspective view of an instrument panel on which a passenger airbag device according to a first embodiment of the present invention is mounted.

FIG. 2 is a sectional view of the airbag device of the embodiment;
It is sectional drawing of the vehicle front-back direction.

FIG. 3 is a perspective view showing a state where the airbag of the embodiment is inflated by itself.

FIG. 4 is a schematic cross-sectional view in the vehicle front-rear direction in a state where the airbag of the embodiment is inflated by itself.

FIG. 5 is a diagram illustrating a first-stage folding step in the airbag of the embodiment.

FIG. 6 is a perspective view showing a state after completion of a first-stage folding step in the airbag of the embodiment.

FIG. 7 is a diagram illustrating a second-stage folding step in the airbag according to the embodiment.

FIG. 8 is a diagram illustrating the airbag of the embodiment when it is deployed and inflated.

FIG. 9 is a view for explaining the airbag of the embodiment when it is deployed and inflated, and shows a state after FIG. 8;

FIG. 10 is a view for explaining the airbag of the embodiment at the time of deployment and inflation, and shows a state after FIG. 9;

FIG. 11 is a view illustrating the airbag of the embodiment when it is deployed and inflated, and shows a state where the airbag interferes with the occupant before the inflation is completed.

FIG. 12 shows a state after FIG. 11 when the airbag of the embodiment interferes with an occupant before completion of inflation.

FIG. 13 is a diagram illustrating a second-stage folding process of the airbag in the passenger airbag device according to the second embodiment.

FIG. 14 is a cross-sectional view of the airbag device of the embodiment, which is a cross-sectional view in the vehicle front-rear direction.

FIG. 15 is a perspective view of an instrument panel on which the passenger airbag device of the embodiment is mounted.

FIG. 16 is a diagram illustrating the airbag of the embodiment when it is deployed and inflated.

FIG. 17 is a view illustrating the airbag of the embodiment when it is deployed and inflated, and shows a state after FIG. 16;

FIG. 18 is a diagram illustrating the airbag of the embodiment when it is deployed and inflated, and shows a state after FIG. 17;

FIG. 19 is a diagram illustrating the airbag of the embodiment when it is deployed and inflated, and shows a state where the airbag interferes with the occupant before the inflation is completed.

FIG. 20 shows a state after FIG. 19 when the airbag of the embodiment interferes with an occupant before completion of inflation.

[Explanation of symbols]

 1.1a (instrument panel) instrument panel 10.10A airbag, 12 lower wall, 12a gas inlet, 13 front wall, 14 passenger side wall, 15 left wall, 16 right Wall part, 23: Front folded part, 24: Rear folded wall part, 44a: Door, P: Passenger, M1, M2: Airbag device for passenger seat.

Claims (4)

[Claims] When an airbag folded and stored in a case is deployed and inflated, an inflation gas flows in from a gas inlet and pushes open a door arranged on an instrument panel to protrude, whereby the airbag is opened. An airbag device for a front passenger seat that expands and inflates rearward, wherein the airbag is arranged on a lower side as a shape at the time of completion of deployment and inflation, and the gas inlet is arranged on a front side to form the gas bag. An occupant which connects a lower wall portion for attaching an inflow peripheral edge to the case, a front wall portion extending obliquely rearwardly and connected to a front end side of the lower wall portion, and a rear end side of the lower wall portion / front wall portion; A left side wall portion and a right side wall portion connected to the lower wall portion, the front wall portion, and the side wall portion of the occupant to close left and right sides of the airbag. Folded in a stage and stored in the case, The folding step of the bag is configured such that the front wall portion is bellows-folded so that the upper end side of the front wall portion approaches the lower end side of the front wall portion from the shape at the time of completion of deployment and inflation. The left wall and the right wall, respectively, so that the left and right sides approach the left and right sides of the lower wall, respectively, and the vicinity of the connection portion between the occupant side wall and the lower wall is the center of the fan. Forming the front and rear folded portions of two flat folded front and rear portions from the vicinity of the center of the gas inlet by fan-folding, so that the air in the second stage The folding step of the bag is characterized in that the front folding section is folded so as to approach the gas inlet, and the rear folding section is an inner roll folding step in which the rear folding section is wound downward from the rear end side. For passenger seat Airbag devices. 2. The fan folding fan according to claim 1, wherein a lower end portion of said occupant side wall is connected to said lower wall portion in a plane before said left wall portion and said right wall portion of said airbag are fan-folded. The airbag device for a passenger seat according to claim 1, wherein the center of the airbag is shifted toward the side wall of the occupant, and the airbag is fan-folded. 3. The airbag according to claim 1, wherein the airbag is housed in the case in a state where the front folded portion is disposed above the rear folded portion. An airbag device for a passenger seat as described in the above. 4. The airbag according to claim 1, wherein the airbag is housed in the case in a state where the front folded portion is disposed in front of the rear folded portion. An airbag device for a passenger seat as described in the above.