JP2000190799A - Air bag device for front passenger seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag device for front passenger seats that can ensure a larger flow of an inflation gas easily via the front opening than via the rear opening of rectifying cloth by virtue of the suppression of increases of the material of the rectifying cloth. SOLUTION: This air bag device for front passenger seats is so designed that an air bag 17 folded and fixedly stored in a case is, for inflation, filled with an inflation gas via a gas inlet 18 so as to open and project from a door arranged in the instrument panel and to expand toward the rear of the vehicle. The air bag 17 contains such a cover part 22a of rectifying cloth 22 as covers the gas inlet 18 in a position with both lateral sides closed and both longitudinal sides open. The cover part 22a of the rectifying cloth 22 is disposed with its center X1 shifted to the rear of the vehicle from the center X0 of the gas inlet 18.

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 an airbag apparatus for a passenger seat, when an airbag is deployed and inflated, an inflation gas flows from a gas inlet and protrudes from a portion of an instrument panel and is inclined forward and downward. Along the windshield that had expanded, it was expanding toward the rear of the vehicle.

[0003] However, with respect to the inflation speed of the airbag, there has been a demand for a reduction in the inflation speed of the airbag toward the occupant seated in the passenger seat, that is, the inflation speed toward the rear of the vehicle.

In order to cope with this case, a straightening cloth is disposed inside the airbag so as to cover both sides of the vehicle in the left-right direction and open both front and rear sides of the vehicle so as to cover the gas inlet. It has been proposed (Japanese Patent Laid-Open No. 9-263)
No. 203).

If such a rectifying cloth is arranged, the inflating gas flowing into the airbag at the time of deployment and inflation of the airbag branches and flows forward and backward by the rectifying cloth. Deploys quickly in the front-back direction. The front portion of the airbag projects to the rear of the vehicle along the windshield. The rear part of the airbag projects rearward of the vehicle along the upper surface of the instrument panel.

Therefore, at the beginning of the deployment and inflation, the airbag is widened in the vertical direction toward the rear of the vehicle so as to close the space between the inner surface of the windshield and the upper surface of the instrument panel. As a result, the occupant moves toward the rear side of the vehicle with the occupant-side part widened as a surface, so that the expansion speed toward the rear side of the vehicle can be reduced.

[0007] When such a straightening cloth is provided, it is desirable that the flow rate of the inflation gas flowing into the inside of the airbag is higher at the front side than at the rear side.

That is, if the inflow of the inflation gas into the front portion of the airbag is increased, the front portion of the airbag is arranged upward along the windshield in the initial stage of deployment and inflation of the airbag. It becomes easier, the rear part of the airbag is aligned with the upper side of the instrument panel,
The surface to the occupant side at the time of deployment and inflation can be arranged vertically and inflated, and even if the occupant is restrained during deployment and inflation,
This is because the pressing force can be suppressed, which is preferable.

Regarding the flow rate adjustment of the inflation gas, the length of the leading edge side of the rectifying cloth is increased, the length of the trailing edge side of the rectifying cloth is shortened, and the opening on the front side provided inside the airbag by the rectifying cloth is formed as follows. It is conceivable to cope with it by making it larger than the opening on the rear side.

However, when the length of the leading edge of the straightening cloth is increased and the length of the trailing edge of the straightening cloth is shortened and arranged inside the airbag, a large amount of material for the straightening cloth is required. At the same time, the length of the rectifying cloth becomes longer, which makes it difficult to install the rectifying cloth such as sewing.

The present invention solves the above-mentioned problem, and suppresses an increase in the material of the straightening cloth so that the flow rate of the inflation gas from the opening on the front side by the straightening cloth can be made easier than the flow rate of the opening on the rear side. It is an object of the present invention to provide a passenger airbag device that can secure a large amount.

[0012]

According to the airbag device for a passenger seat according to the present invention, when the airbag folded and stored and fixed in the case is deployed and inflated, the inflation gas flows from the gas inlet port. , The door arranged on the instrument panel is opened and protruded, and is configured to expand toward the rear of the vehicle.At the same time, both sides in the left and right direction of the vehicle are closed, and both front and rear sides of the vehicle are opened. An airbag device for a passenger seat, in which a cover portion of a rectifying cloth is disposed so as to cover the gas inlet, wherein the cover portion of the rectifying cloth has a center at a center of the vehicle from a center of the gas inlet. It is characterized by being shifted to the rear side.

[0013] The airbag is folded so that a ceiling wall portion side facing the gas inlet port approaches the gas inlet port side, and both front and rear edges are folded so as to approach the center. And, when folded by vertical folding to bring both the left and right edges closer to the center, and stored and fixed in the case, the front part of the airbag,
At the time of horizontal folding, bellows folding, the rear part of the airbag,
During horizontal folding, it is desirable to fold the inner roll.

Further, it is preferable that the front side portion of the airbag is folded in a bellows state in a state where the front edge side is folded back to the ceiling wall portion side when the side bag is folded sideways.

It is preferable that the center of the cover is shifted from the center of the cover within a range in which the front edge of the cover is located forward of the front edge of the gas inlet.

[0016]

In the passenger airbag apparatus according to the present invention, the cover for covering the gas inlet of the rectifying cloth disposed inside the airbag has its center at the rear side of the vehicle from the center of the gas inlet. The distance from the leading edge of the gas inlet to the leading edge of the cover is short, and the distance from the trailing edge of the gas inlet to the trailing edge of the cover is long. The inflation gas flowing from the inflow port largely flows into the airbag from the front edge side of the cover portion having low resistance when passing.

As a result, the flow rate of the inflation gas from the opening on the front side due to the straightening cloth can be ensured to be larger than the flow rate of the opening on the rear side.

Further, the cover portion of the straightening cloth is simply displaced from the center of the gas inlet to the rear side of the vehicle without increasing the length of the front edge side, and uses a large amount of material. If not, they can be easily dealt with,
Since the length of the cover portion can be shortened, installation work such as suturing becomes easy without being bulky.

Therefore, in the passenger airbag device according to the present invention, the flow rate of the inflation gas from the opening on the front side by the cover portion of the rectifying cloth is reduced by suppressing the increase in the material of the rectifying cloth. Can easily be secured more than the flow rate.

[0020] As described in claim 4, the cover is displaced from the center of the cover within a range in which the front edge of the cover is located forward of the front edge of the gas inlet. Let it be placed. This is because, when the airbag is deployed and inflated, if the front edge side of the cover portion is disposed behind the front edge of the gas inlet, the inflation gas flows into the airbag without interfering with the cover portion of the rectifying cloth. This is because there is no point in providing the rectifying cloth.

If the airbag is folded sideways as described in claim 2, when the airbag is deployed and inflated, the front portion of the airbag is bellows-folded and quickly deployed. Conversely, the rear portion of the airbag is an inner roll fold, and the resistance to unwind the rolled state is large, and the deployment direction of the rear edge side of the airbag is set to a downward direction opposite to the inflow direction of the inflation gas. As a result, the vehicle is deployed along the instrument panel later than the front part and downward.

Therefore, the front portion of the airbag is quickly deployed to the rear of the vehicle along the windshield, and the rear portion of the airbag is deployed to the rear of the vehicle with a delay along the instrument panel. The ceiling wall of the airbag during deployment and inflation moves toward the rear of the vehicle on a wide surface and close to the vertical plane, and the occupant restraint performance during deployment and inflation is reduced. It can be further improved.

When the front portion of the airbag is folded sideways when the front portion is folded back on the ceiling wall portion when the airbag is folded sideways, the front portion of the airbag is folded at the front portion of the airbag when the airbag is deployed and inflated. First, the folded portion that has been folded and the portion to be folded that has been placed on this folded portion,
Together, they unfold quickly so as to eliminate bellows folds, but the folded part moves away from the folded part around the fold overlapped with the folded part, Since the airbag rotates forward so as to eliminate the eyes, the entire front portion of the airbag does not protrude to abut on the windshield.

Therefore, in the case of the configuration as described in claim 3, the impact on the windshield can be suppressed as compared with the case where the front part of the airbag is simply folded in a bellows. Also, the front edge side of the airbag contacts the windshield only after the folded part rotates forward with the folded part as the center of rotation, so the length rubbed against the windshield is shorter. Also, other portions of the airbag can contribute to suppressing damage to the airbag because the length of the other portion of the airbag that rubs against the windshield is shorter than that of the front edge when the front portion of the airbag is simply folded in a bellows shape.

[0025]

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

The passenger-side airbag device M of the embodiment is
As shown in FIGS. 1 and 2, a top-mount type is disposed on an instrument panel (hereinafter abbreviated as an instrument panel) 2 below a windshield 1, and includes a case 7, an inflator 10, a diffuser 11, a retainer 12, It is provided with a lid 14 and an airbag 17.

The case 7 is made of sheet metal and includes a substantially rectangular parallelepiped main body 8 and a pressing plate 9 disposed around the upper portion of the main body 8. The main body 8 includes a lower chamber 8 a for storing the inflator 10 and the folded airbag 1.
And an upper chamber 8b for accommodating the same.
The holding plate member 9 is formed in a substantially quadrangular cylindrical shape so as to cover a lower portion of the upper chamber 8b below a stepped portion 8c disposed on both sides in the front-rear direction of the vehicle and to cover a peripheral wall 8e of the upper chamber 8b. . Step 8c and Step 8 of Presser Plate 9
Through holes 8d and 9a through which the bolts 12a of the retainer 12 are inserted are formed in portions that cover c.

The front and rear portions of the peripheral wall 8e of the upper chamber 8b are engaged with side walls 14d, which will be described later, of the lid 14 so that the side walls 14d can be prevented from coming off.
A projection 8f is formed to be inserted into a plurality of locking holes 14e provided in the side wall 14d. Each projection 8f has
An insertion hole 8g for inserting the insertion piece 9b extending from the insertion piece 9b provided on the holding member 9 is formed.

The inflator 10 is housed and held in the lower chamber 8a of the case 7 as a column having a gas discharge port 10a for inflation gas for inflating the airbag 17.

The diffuser 11 is made of sheet metal and has a substantially rectangular plate whose peripheral edge is curved so as to be able to abut on each step 8c of the case body 8, and is provided at a predetermined position with gas flow holes 11a through which inflation gas can pass. 11a. A through hole 11 b through which each bolt 12 a of the retainer 12 can be inserted is formed on the periphery of the diffuser 11.

The retainer 12 is made of a curved rectangular annular sheet metal and includes a plurality of bolts 12a extending downward. The retainer 12 is provided with each bolt 12a.
Are attached to a mounting hole 19a of the airbag 17, a through hole 11b of the diffuser 11, and a through hole 8d of the case body 8.
-Each bolt 12 is inserted through the through hole 9a of the holding member 9.
By screwing the nut 13 into the a, the airbag 17 is fixed to the case 7 together with the diffuser 11 and serves to assemble the case 7 itself.

The lid 14 is formed of an olefin-based or styrene-based thermoplastic elastomer or the like, and has a ceiling wall portion 14a disposed in a rectangular opening 2a of the instrument panel 2 which is opened substantially vertically, and a ceiling wall portion. And a side wall portion 14d extending downward from the lower surface of 14a in a square tube shape. On the ceiling wall 14a, on the lower surface of the outer peripheral edge,
A plurality of locking claws 1 for locking to the opening peripheral edge 2b in order to improve the parting of the ceiling wall portion 14a with the instrument panel 2
4b is formed. In addition, two doors 15 are disposed in the ceiling wall portion 14a at a portion inside the side wall portion 14d and open when the airbag 17 is inflated by breaking the thin wall portion 14c. The breakable portion 14c is formed in an “H” shape when viewed from above in the front-rear direction of the vehicle. The two doors 15 are arranged before and after the vehicle, and when the airbag 17 is inflated, the door 15 (F) arranged on the front side is opened forward and the door 15 (F) arranged on the rear side. B) is configured to open rearward.

The side wall portion 14d is formed with a plurality of locking holes 14e whose peripheral edges are locked to the above-mentioned projections 8f formed on the peripheral wall 8e of the case body 8.

As shown in FIGS. 1 to 4, the airbag 17 has a bag shape having a gas inlet 18, and is made of a flexible woven fabric such as polyamide yarn or polyester yarn. Two inlet and outlet walls 20 and a ceiling wall 21 facing the gas inlet 18 are prepared, and their peripheral edges are sewn together. And the airbag 17
Has a substantially truncated quadrangular pyramid shape as shown by the two-dot chain line in FIG. The periphery of the gas inlet 18 is
A mounting piece 19 for mounting to the case 7 is formed, and the mounting piece 19 is provided with a mounting hole 19a through which each bolt 12a of the retainer 12 is inserted. As shown in FIGS. 4 and 6, two reinforcing cloths 28 made of a woven cloth such as a polyamide yarn or a polyester yarn having a suture 27 are used for the mounting piece 19. And it is sutured. 29 is a vent hole.

The air bag 17 has
A rectifying cloth 22 is provided to cover the gas inlet 18. The rectifying cloth 22 closes both sides in the left-right direction of the vehicle when mounted on the vehicle, and opens both sides in the front-rear direction of the vehicle when mounted on the vehicle.
Are located.

As shown in FIGS. 3 to 6, the rectifying cloth 22 of the embodiment is composed of two cloths 23 and 24 made of a woven cloth such as a polyamide yarn or a polyester yarn having flexibility.
Utilizing (see FIG. 5), it is sewn to the attachment piece 19 and further sewn to each other. Each cloth 23.2
Reference numeral 4 denotes a substantially rectangular mounting base portion 23a / 24b to be sewn to the mounting piece portion 19, and a distal end portion 2 extending from the mounting base portion 23a / 24a and sewn to each other at the sewn portions 23c / 24c.
3b and 24b, and the gas inlet 18
Is covered with a cover 22a formed by sewing the tips 23b and 24b together. The cover portion 22a is arranged such that its center X1 is offset from the center X0 of the gas inlet 18 toward the rear side of the vehicle. In the case of the embodiment, the offset amount e is about 40 mm.

Further, in the rectifying cloth 22 of the embodiment, the stitching positions SL and SR on both the left and right sides of the distal end portions 23b and 24b with respect to the inflow side wall 20 in the mounting bases 23a and 24a of the cloth materials 23 and 24 are shown in FIG. As shown in the figure, the front end portion 23b of the vehicle is tapered using a mutual suturing portion 223c 24c as shown by a two-dot chain line in FIG. Since the cover portion 22a is sewn to each other along the left-right direction, the front edge 22b
Is longer than the rear edge 22c of the cover portion 22a.

The production of the airbag 17 of the embodiment will be described. First, as shown in FIG.
In the state in which the gas inlet 18 is provided on the inflow side wall 20 on the inner peripheral surface side of the airbag 17, the mounting bases 23 a and 2 of the reinforcing cloths 28 and 28 and the cloth materials 23 and 24 are not provided.
4a is sewn with a suture thread 27, and a reinforcing cloth 30 (see FIG. 5) is sewn at the position of the vent holes 29, 29 of the inflow side wall portion 20, respectively.
Then, as shown in FIG.
9a ・ Vent hole 29 is provided by drilling.

Next, the peripheral portions of the inflow side wall portion 20 and the ceiling wall portion 21 on the outer peripheral surface side of the airbag 17 are joined together, and the peripheral edges are sewn together. Further, the margin of the peripheral edge is not shown on the outer surface side. Then, using the gas inlet 18, the inside out is turned over, and the tip portions 23 b and 24 b of the cloth materials 23 and 24 are turned over.
5 is taken out from the gas inlet 18 and the sewn portions 23c and 24c are sewn to each other to form a cover portion 22a as shown by a two-dot chain line in FIG. Then, the airbag 17 can be manufactured.

Next, a process of folding the airbag 17 of the embodiment will be described. First, as shown in FIG.
The ceiling wall 21 facing the gas inlet 18 is folded so as to approach the gas inlet 18.

Thereafter, as shown in FIGS. 7A and 7B, a lateral fold H0 is formed so that the front edge 31 of the airbag 17 approaches the vicinity of the central portion 21a of the ceiling wall portion 21. The front portion 17a of the bag 17 is folded in two. At this time, the front side portion 17a of the airbag 17 includes a folded portion 36 that is folded and a folded portion 37 in which the folded portion 36 is overlapped.

In the horizontal folding, the fold H (H0)
And a fold H1) to be described later, and the fold H of the lateral fold runs along the left-right direction of the vehicle when the airbag device M is mounted on the vehicle.

Next, as shown in FIGS. 7B and 7C, a fold portion 39 serving as a front edge generated at the fold H0 and a rear edge 32 are formed.
Is folded sideways with a fold line H1 so that と approaches the vicinity of the center O1.

At the time of this lateral folding, in the case of the embodiment, the front side portion 17a of the airbag 17 is maintained while the folded portion 36 is folded over the folded portion 37.
Roll folding in which the rear portion 17b is wound with the rear edge 32 toward the gas inlet 18 and placed on the ceiling wall portion 21 as a bellows fold in which a fold H1 is formed and zigzag and valley folding and mountain folding are repeated. That is, the inner roll is folded.

Thereafter, as shown in FIG. 7D, the left and right edges 33 and 34 are vertically folded so as to approach the vicinity of the center O2. This vertical fold is to make a fold V in the front-rear direction, and the fold V in the vertical fold is along the front-rear direction of the vehicle when the airbag device M is mounted on the vehicle. In the case of the embodiment, the left and right edges 33 and 34 are formed into inner rolls which are roll-folded toward the gas inlet 18.

When folding as shown by B, C and D in FIG. 7, the bolt 12 is actually inserted from each mounting hole 19a.
This is performed in a state in which the retainer 12 is housed in the airbag 17 while projecting a.

After the airbag 17 is folded in this manner, in order to prevent the airbag 17 from being broken, each of the bolts 12a is protruded and a sheet material 16 (see FIG. 1) such as a non-woven fabric or a film that can be broken is used. Cover, then diffuser 1
Each bolt 12a of the retainer 12 is inserted into the through-hole 11b with respect to the case main body 8 in which the
The airbag 17 is housed while being inserted through 8d, and then the lid 14 is put on the main body 8, and the projection 8f of the peripheral wall 8e is locked on the periphery of each locking hole 14e of the side wall 14d. A bolt 12a is inserted into each through hole 9a, and
The airbag device M can be assembled by disposing the holding plate 9 around the main body 8 from below so as to insert the insertion piece 9b into each insertion hole 8g and screwing the nut 13 to each bolt 12a. it can. And then, lid 1
4 and the bracket (not shown) extending from the case 7 is connected and fixed to a frame of the vehicle, as shown in FIGS. Can be attached to a predetermined portion of the instrument panel 2.

After the inflation gas is discharged from the gas discharge port 10a of the inflator 10 after the airbag device M is mounted on the vehicle, the inflation gas G flows into the airbag 17 from the gas inlet 18. And the gas inlet 18
However, since it is covered with the ceiling wall portion 21 with the cover portion 22a of the rectifying cloth 22 interposed therebetween, first, the vicinity of the central portion 21a of the ceiling wall portion 21 and the folded portion covering the vicinity of the central portion 21a are: The door 1 is moved upward away from the gas inlet 18 to rupture the rupture scheduled portion 14 c of the lid 14, and
When the airbag 17 is opened, the airbag 17 is deployed and inflated as shown by a two-dot chain line in FIG.

At this time, the airbag 17 of the embodiment protrudes from the opening 2a of the instrument panel 2 and first expands to the left and right sides so as to eliminate vertical folding. Further, the inflation gas G flowing into the airbag 17 is branched forward and backward by the cover portion 22a of the rectifying cloth 22, so that the airbag 17 tends to deploy to both sides in the front-rear direction quickly. .

The front portion 17a of the airbag 17
First, the folded portion 36 that has been folded and the folded portion 37 where the folded portion 36 is overlapped are unified and quickly unfolded together so as to eliminate bellows folding.

In the front portion 17a of the airbag 17, the folded portion 36 is separated from the folded portion 37 around the fold portion 39 overlapped with the folded portion 37, and its fold line H0 To rotate forward so that

Next, as shown by a two-dot chain line in FIG. 8, the folded portion 37 and the folded portion 36 developed along the windshield 1 are each provided with a horizontal fold line H0. The airbag 17 is further deployed so as to eliminate H1, and the airbag 17 is in the inflation completed state.

In the airbag device M according to the embodiment, when the inflation gas G flows into the airbag 17, the rectifying cloth 22 disposed inside the airbag 17 uses the cover portion 22 a covering the gas inlet 18. Is shifted from the center X0 of the gas inlet 18 toward the rear side of the vehicle, and the distance from the front edge 19b of the gas inlet 18 to the front edge 22b of the cover 22a is short. , Gas inlet 1
Since the distance from the rear edge 19c side of the cover portion 22a to the rear edge 22c side of the cover portion 22a is long, the inflation gas G flowing in from the gas inlet 18 is indicated by a two-dot chain line in FIGS. The front edge 2 of the cover portion 22a having a low resistance when passing
A large amount will flow into the airbag 17 from the 2b side.

As a result, the flow rate of the inflation gas G from the opening 25 on the front side by the cover portion 22a of the rectifying cloth 22 can be secured more than the flow rate of the opening 26 on the rear side.

Further, the cover portion 22a of the flow regulating cloth 22 is merely displaced from the center X0 of the gas inlet 18 to the rear side of the vehicle without greatly increasing the length of the front edge 22b side. Therefore, it can be easily dealt with without using a lot of materials.

Therefore, in the airbag device M for the passenger seat of the embodiment, the flow rate of the inflation gas G from the opening 25 on the front side by the rectifying cloth 22 is reduced by suppressing the increase of the material of the rectifying cloth 22. It can be easily secured more than the flow rate of the opening 26.

By the way, if the length of the cover portion 22a in the front-rear direction is the same as the conventional length, the rear edge 22c of the cover portion 22a extends toward the rear side of the vehicle by the offset to the rear side. Will be done. In this case, the rear opening 26 formed between the rear edge 22c of the cover portion 22a and the inflow side wall portion 20 is disposed on the rear side of the vehicle, so that the inflation gas during deployment and inflation is provided. G flows along the instrument panel 2, and the rear portion 17b of the airbag 17 is
The airbag 17 can be further deployed along the upper surface of the instrument panel 2, and the opening angle of the airbag 17 in the vertical direction during deployment and inflation is further increased, and the airbag 17 moves to the rear side of the vehicle on a wide surface. This can contribute to improving the occupant restraint performance during inflation.

The cover part 22a is provided with a cover part 22a.
Of the cover portion 22a within a range in which the front edge 22b of the
1 is shifted. Because, when the airbag 17 is deployed and inflated, if the front edge 22b side of the cover portion 22a is disposed behind the front edge 19b of the gas inlet 18,
This is because the inflation gas G flows into the airbag 17 without interfering with the cover portion 22a of the rectifying cloth 22, and there is no point in providing the rectifying cloth 22.

Further, in the embodiment, when the airbag 17 is deployed and inflated, the front side portion 17a of the airbag 17 is a bellows-fold and is quickly deployed. Conversely, the rear side portion 17b of the airbag 17 is an inner roll fold, and the resistance to unwind the rolled state is large, and the rear edge 3 of the airbag 17 is
Since the deployment direction on the two sides is set to the downward direction opposite to the inflow direction of the inflation gas G, the deployment state is slower and lower than the front part along the instrument panel.

Therefore, the front portion 17 of the airbag 17
a quickly deploys to the vehicle rear side along the windshield 1, and the rear portion 17 b of the airbag 17 deploys to the vehicle rear side with a delay along the instrument panel 2,
The ceiling wall portion 21 of the airbag 17 during deployment and inflation moves toward the rear of the vehicle on a wide surface and in a state of approaching the vertical plane, and the occupant restraint performance during deployment and inflation is reduced. It can be further improved.

In particular, in the embodiment, the airbag 1
7 is folded in a bellows manner in a state where the front edge 31 side is folded back on the ceiling wall 21 side and overlapped at the time of lateral folding.

Therefore, when the airbag 17 is deployed and inflated,
In the front side portion 17a of the airbag 17, first, the folded portion 36 and the folded portion 37 in which the folded portion 36 overlaps are unified and quickly deployed so as to eliminate bellows folding together. , The folded portion 36,
The front part of the airbag 17 is rotated around the fold part 39 overlapped with the fold part 37 to rotate forward so as to eliminate the fold H0 away from the fold part 37. All of 17a do not protrude to abut on the windshield 1.

Therefore, the impact on the windshield 1 can be suppressed as compared with the case where the front portion 17a of the airbag 17 is simply folded in a bellows. Further, the front edge 31 of the airbag 17 contacts the windshield 1 only after the folded portion 36 rotates forward with the folded portion 39 as the center of rotation. The length of the airbag 1
7 also has a shorter length of rubbing with the windshield 1 than the front edge 31 when the front side portion 17a of the airbag 17 is simply folded in a bellows shape.
It can also contribute to suppressing the damage of the.

Of course, if such an operation and effect are not taken into consideration, the valley fold and the mountain fold are zigzag so that the front portion 17a of the airbag 17 simply approaches the center portion 21a side of the ceiling wall portion 21. Repeated bellows folding may be used.

When the airbag 17 is folded horizontally, the rear portion 17b is wound around the rear edge 32 toward the center portion 21a of the ceiling wall 21 without folding the inner roll.
A lateral folding may be performed by a method of winding and folding with a large resistance at the time of inflation and deployment, such as folding an outer roll placed on the top. In this case, since the deployment speed of the rear portion 17b is lower than that of the front portion 17a, it is possible to contribute to disposing the ceiling wall portion 21 in the vertical direction to some extent when the airbag 17 is deployed and inflated. Of course, if such actions and effects are not considered, the rear portion 17b may be folded in a bellows.

In the embodiment, when the airbag 17 is vertically folded, the inner roll is folded. However, the left and right edges 29 and 30 are folded toward the gas inlet 18 as shown in FIG. Thereafter, the inside roll may be deformed such that the folded portion is placed on the center side of the ceiling wall portion 21.

Incidentally, like these, the airbag 1
In the vertical folding of 7, when the inner roll or the deformed inner roll is folded and arranged in the center of the ceiling wall portion 21, the inflation of the airbag 17 is larger than in the case of the bellows fold or the outer roll fold. At this time, the left and right edges 29 and 30 are preferably prevented from unfolding toward the occupant, and the ceiling wall portion 21 is further moved toward the occupant in a state of a wide surface that is expanded in the left and right direction.

Further, in the embodiment, the case where the airbag 17 is laterally folded and vertically folded is shown. However, the airbag 17 is folded vertically and then horizontally, and at the time of this transverse folding, the front portion 17a is folded in a bellows state. May be folded.

That is, as shown in FIGS. 9A and 9B, first, vertical folding is performed by outer roll folding or bellows folding so that the left and right edges 33 and 34 of the airbag 17 are close to the center O2 side.

Next, as shown in FIG. 9C, a horizontal fold H0 is formed so that the front edge 31 of the airbag 17 approaches the vicinity of the central portion 21a of the ceiling wall portion 21. Is folded in two.

Thereafter, as shown in FIG.
A fold H1 is provided so that the fold portion 39 and the rear edge 32, which are front edges generated in the above, approach the center O1.
Fold sideways. At the time of this horizontal folding, the folded front portion 17a of the airbag 17 is formed as a bellows-shaped portion, and the rear portion 1
7b may be laterally folded by inner roll folding or the like.

In the embodiment, the front edge 22b of the cover portion 22a is longer than the rear edge 22c of the opening 25, 26 in the vehicle front-rear direction inside the airbag 17 formed by the cover portion 22a of the rectifying portion 22. The opening 25 on the front side has a larger opening area than the opening 26 on the rear side, so that the flow rate of the inflation gas G to the air bag front side portion 17a can be further increased, and It is easy to arrange the vicinity of the center portion 21a of the ceiling wall portion 21 in the vertical direction, and the occupant restraint performance during deployment and inflation is improved. Therefore, regarding the flow rate control of the inflation gas G in the front-rear direction, the offset of the cover portion 22a toward the vehicle rear side and the adjustment of the lengths of the edges 22b and 22c may be used together as in the embodiment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a use mode of an airbag device according to an embodiment of the present invention, and is a cross-sectional view in a front-rear direction of a vehicle.

FIG. 2 is a cross-sectional view showing a use mode of the airbag device of the embodiment, and is a cross-sectional view of the vehicle in a left-right direction.

FIG. 3 is a bottom view of the airbag used in the embodiment.

FIG. 4 is a sectional view taken along a line IV-IV in FIG. 3;

FIG. 5 is a view showing a middle of a manufacturing process of the airbag according to the embodiment, and shows a state after a predetermined perforation process is performed on an inflow side wall.

FIG. 6 is a view showing a middle of a manufacturing process of the airbag of the embodiment, and is a perspective view showing a cloth material and the like arranged on the inlet side wall.

FIG. 7 is a diagram illustrating a process of folding the airbag of the embodiment.

FIG. 8 is a schematic diagram showing an inflated state of the airbag of the embodiment.

FIG. 9 is a diagram illustrating a process of folding an airbag according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... windshield, 2 ... (instrument panel) instrument panel, 7 ... case, 15 ... door, 17 ... airbag, 17a ... front part, 17b ... rear part, 18 ... gas inlet, 19b ... front side edge, 19c: rear side edge, 21: ceiling wall portion, 22: straightening cloth, 22a: cover portion, 22b: front edge, 22c: rear edge, 36: folded portion, 37: folded portion, X0 (gas flow Inlet) center, X1 ... (cover part) center, G ... inflation gas, M ... airbag device for passenger seat.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tatsuo Hirano 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (72) Inventor Yuji Kuriyama 1 Ochiai-Ochiai, Kasuga-cho, Nishi-Kasugai-gun, Aichi F-term (reference) in Toyoda Gosei Co., Ltd. 3D054 AA03 AA14 BB16 CC10 CC15 CC29 CC30 CC34 CC41 CC42 CC43 DD14 DD15 FF20

Claims (4)

[Claims] An airbag folded and stored and fixed in a case allows an inflation gas to flow from a gas inlet when the airbag is deployed and inflated.
The door arranged on the instrument panel is opened and protruded, and it is configured to expand toward the rear of the vehicle.In addition, both sides of the vehicle in the left and right direction are closed, and both sides of the front and rear of the vehicle are opened, An airbag device for a passenger seat, in which a cover portion of a rectifying cloth is disposed so as to cover the gas inlet, wherein the cover portion of the rectifying cloth has a center at a rear of a vehicle from a center of the gas inlet. An airbag device for a passenger's seat, which is displaced to the side. 2. The horizontal fold wherein the airbag is folded so that a ceiling wall side facing the gas inlet port approaches the gas inlet port side, and both front and rear edges are folded close to the center. And a vertical fold that folds both the left and right edges so as to approach the vicinity of the center, and is stored and fixed in the case. 2. The passenger seat air according to claim 1, wherein, at the time of lateral folding, the rear side portion is formed as an inner roll folded so that a trailing edge side is wound toward the gas inlet side and placed on the ceiling wall portion. 3. Bag device. 3. The airbag according to claim 1, wherein a front side portion of the airbag is folded in a bellows state in a state where the front edge side is folded back on the ceiling wall side when the side bag is folded sideways. An airbag device for a passenger seat as described in the above. 4. The center of the cover portion is displaced within a range in which a front edge of the cover portion is disposed on a front side of a front edge of the gas inlet. An airbag device for a passenger seat according to any one of claims 1 to 3.