JP2000225912A - Air bag device for side collision of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a mounting hole in an occupant's side basic cloth member in an air bag from being torn with a simple structure by sewing ends of a storing part and a bent-back part of the air bag to each other. SOLUTION: A bent-back part of an air bag 4 is preliminarily bent back to the side of a storing part 19, and under the condition the circumferential edge thereof is sewn along a sewn part 24, by which both upper and lower ends of the parts 18, 19 are mutually sewn. Since both the upper and lower ends thereof are simultaneously sewn at the sewing step for forming the air bag 4 at first, the producing efficiency thereof is improved remarkably. Also, since the part 24 spans between both the upper and lower ends, even if the capacity of an inflator is large and the material of vechicle side basic cloth member 15 of the air bag 4 and/or that of occupants' side basic cloth member 16 thereof is weak, it is possible to prevent the part 24 from being torn when the foward load to be applied to the member 16 acts thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side collision airbag device for an automobile.

[0002]

2. Description of the Related Art An airbag device for an automobile is provided with a seat back when a vehicle collides with the side of the own vehicle or when the side of the own vehicle collides with an external obstacle such as a telephone pole. There is a side collision airbag device in which an airbag is deployed forward from a side portion and an occupant is protected by the airbag (see JP-A-10-181498 as a similar technique).

[0003] An airbag used in this type of side collision airbag device is formed by sewing two base cloths on a vehicle body side and an occupant side into a bag shape. The rear end of the airbag is in a non-sewn state as an opening, and the inflator is inserted from the opening to the storage portion position of the airbag, stored therein, and thereafter, the rear side of the storage portion. The folded part is folded back to the storage part side to close the opening. Then, stud bolts of the inflator are protruded from mounting holes formed in the occupant-side base cloth of the storage section and both base cloths of the folded-back section, and the stud bolts are fixed to a frame arranged in the side part of the seat back. ing.

[0004]

However, in such a conventional technique, the airbag is pulled forward by a strong forward load when the airbag is deployed forward by the gas of the inflator. Stress concentrates on the mounting hole of the occupant-side base fabric that forms the airbag, and the mounting hole may be torn. That is, since the vehicle body-side base fabric is wrapped around the rear side of the inflator, a part of the forward load applied to the vehicle body-side base fabric is also received by friction with the rear surface of the inflator, and the mounting hole in the vehicle body-side base fabric is provided. However, in the case of the occupant-side fabric, since the occupant-side fabric is simply folded, the forward load applied to the airbag directly acts on the mounting hole, and the mounting hole may be torn. Therefore, conventionally, in order to prevent the mounting hole in the occupant-side base cloth from being torn, it is necessary to increase the thickness of the occupant-side base cloth or add a metal fitting to the mounting hole. In addition, the mounting structure is complicated, and improvement is required.

SUMMARY OF THE INVENTION The present invention has been made in response to such a demand, and has a simple structure which can prevent a mounting hole in an occupant-side base fabric of an airbag from being torn and cut off. Is provided.

[0006]

According to the first aspect of the present invention,
A bag-shaped airbag is formed by the body-side base cloth and the occupant-side base cloth, and an inflator for enclosing gas in the airbag is inserted from an opening at a rear end of the airbag, is stored in a storage section position, and is stored. The folded part behind the part is folded back to the storage part side, and the projection of the inflator is projected from each mounting hole formed in the occupant side base fabric of the storage part and the base cloth of the folded part, and the projection is fixed to the seat back A side collision airbag device for an automobile in which an airbag is inflated by an inflator gas and deployed forward at the time of a collision, wherein the storage portion and the folded portion of the airbag have their ends sewn to each other. I have.

According to the first aspect of the present invention, the ends of the storage portion and the folded portion of the airbag are sewn to each other.
The rigidity of the sewn portion and its surroundings is improved, and a part of the forward load applied to the occupant-side fabric can be dispersed to the vehicle-body-side fabric via the sewn portion. Accordingly, the load acting on the mounting hole of the occupant-side base fabric is reduced, and the mounting hole is prevented from being torn. This eliminates the need for a complicated structure, such as the conventional technique, in which the occupant-side base cloth is thickened or a metal fitting for preventing tearing is mounted in the mounting hole, and the structure of the airbag itself and the mounting structure are simplified. Can be planned.

In the invention according to claim 2, the upper and lower ends of the sewn ends of the storage portion and the folded portion of the airbag are sewn to each other.

According to the second aspect of the present invention, even if the capacity of the inflator is large and the material of the base fabric of the airbag is relatively weak, the forward load applied to the occupant-side base fabric is not affected by the sewing portion. In addition, since the sewn portion extends over both upper and lower end portions, the tearing can be reliably prevented.

According to the third aspect of the invention, in a state in which the folded portion is folded back to the storage portion side, the peripheral edges of the vehicle body-side fabric and the occupant-side fabric are sewn by continuous sewing portions.

According to the third aspect of the present invention, when the peripheral edges of the vehicle body-side base cloth and the occupant-side base cloth are sewn to form the airbag first, the ends of the storage portion and the folded portion are sewn at the same time. Therefore, the production efficiency of the airbag is improved.

According to the present invention, before the folded portion is folded back to the storage portion side, the peripheral edges of the vehicle body-side fabric and the occupant-side fabric are sewn by a continuous sewing portion, and thereafter, the folded portion is stored. It is folded back to the side, and its ends are sewn to each other by another sewing part.

According to the fourth aspect of the present invention, the periphery of the vehicle body-side base cloth and the occupant-side base cloth are sewn to stabilize the state of the airbag once, and thereafter, the folded portion is turned back and sewn again. In addition, the airbag manufacturing operation is easy, and the airbag can be reliably manufactured even by a non-expert.

According to a fifth aspect of the present invention, the folded portion includes:
Provided only on the vehicle body side fabric.

According to the fifth aspect of the present invention, since the mounting hole of the occupant-side base cloth is prevented from being torn, the base cloth at the turn-back portion is not limited to the vehicle body-side base cloth. By using only the body-side base fabric as the folded portion, the opening of the airbag is substantially widened, and the work of inserting the inflator into the airbag becomes easy.

According to a sixth aspect of the present invention, the reinforcing cloth is sewn on the mounting hole portion of the vehicle body-side base cloth and / or the occupant-side base cloth.

According to the sixth aspect of the present invention, since the reinforcing cloth is sewn on the mounting holes of the vehicle body-side base cloth and / or the occupant-side base cloth, tearing of the mounting holes is further prevented.

According to a seventh aspect of the present invention, a bar-shaped reinforcing member is attached to the rear side of the mounting hole by a reinforcing cloth.

According to the seventh aspect of the present invention, since the bar-shaped reinforcing member is attached to the rear side of the mounting hole, the mounting hole is more reliably prevented from being torn.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the embodiments, common portions are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 to FIG. 10 are views showing a first embodiment of the present invention. FIG. 1 is a diagram of a front seat 1 on the driver's seat side (right side) as viewed obliquely from the front. On the right side of the front seat 1, there is a door 2 forming a side wall in the vehicle interior. At the right end of the seat back 3 of the front seat 1, an airbag 4 is housed. The airbag 4 has a substantially L-shape including a chest protection portion 4a and a head protection portion 4b. The airbag 4 is deployed forward to protect an occupant during a side collision of an automobile. I have.

First, the storage structure of the airbag 4 and the state when the airbag 4 is deployed will be described with reference to FIGS. At the front end of the right side of the seat back 3, a cleavage portion 6 is provided in a part of the skin 5 along the longitudinal direction. The split portion 6 is formed by sewing the ends of the skin 5 together, and the sewing strength of this portion is set lower than the sewing strength of the other sewing portions. A pad 7 is provided inside the skin 5,
Inside thereof, a resin cover 9 having a notch 8 at a position corresponding to the cleavage 6 is provided. The airbag 4 is provided inside the cover 9, and the inflator 10 is housed inside the airbag 4. The inflator 10 includes an elliptical cylindrical case 11,
The case 11 is formed with a gas ejector 12, and a gas outlet 11 a (see FIG. 6) is formed at a lower part of the front surface of the case 11. From the case 11 of the inflator 10,
The stud bolts 13 protrude laterally as “projections”. After the stud bolts 13 penetrate the airbag 4, they are fixed to a frame 14 provided inside the seat back 3.

Therefore, in the event of a vehicle side collision, the gas blown out from the inflator 10 inflates the airbag 4, so that the cover 9 is opened from the notch 8 and divided into right and left. The cover 9 divided into right and left serves as a guide for the airbag 4 inflating forward. The inflatable airbag 4
Pushes down the pad 7 and breaks the epidermis 5 from the cleavage portion 6 to deploy forward. The occupant's chest can be protected by the chest protector 4a of the airbag 4 deployed forward, and the occupant's head can be protected by the head protector 4b.

Next, the structure of the airbag 4 itself will be described with reference to FIGS. This airbag 4
Is basically formed of two body-side base cloths 15 and an occupant-side base cloth 16 having the same shape. That is, the peripheries of the vehicle-body-side base cloth 15 and the occupant-side base cloth 16 are formed by sewing, and the rear end is not sewn as the opening 17. Inside the airbag 4, two partition cloths 4k (FIG. 2)
) Is sewn to control the inflation and deployment of the airbag 4. The inflator 10 has the opening 1
7 is inserted into the airbag 4. A predetermined width from the edge of the opening 17 of the airbag 4 is a folded portion 18,
A predetermined width from the folded portion 18 is a storage portion 19.
The inflator 10 is inserted up to the storage portion 19,
It is stored there.

Mounting holes 20 are formed in the vehicle body-side base cloth 15 and the occupant-side base cloth 16 of the turn-back portion 18 and the occupant-side base cloth 16 of the storage section 19 at vertically separated positions. Two pairs of reinforcing cloths 21 and 22 are attached by sewing to the inner surface of the storage portion 19 on the occupant-side base cloth 16 side and the inner surface of the folded portion 18 on the vehicle-body-side base cloth 15 side, respectively. The mounting holes 20 are also formed in the reinforcing cloths 21 and 22. Reinforcement cloth 21 attached to storage section 19 side
, A bar-shaped reinforcing member 23 is provided behind the mounting hole 20. The reinforcing member 23 is a rod made of nylon (or metal), and a tubular portion is formed in the reinforcing cloth 21 by two sewing portions provided behind the mounting hole 20 and inserted into the tubular portion. Things. The reinforcing cloths 21 and 22 are not shown in FIG. 6 and the like.

As shown in FIGS. 8 and 9, this airbag 4 is obtained by sewing the periphery of the airbag 4 with a continuous sewing portion 24 in a state where the folded portion 18 of the airbag 4 is folded back to the storage portion 19 in advance. The sewing portion 24 allows the folded portion 1
8 and the upper and lower ends of the storage portion 19 are sewn to each other. As described above, since the upper and lower ends of the storage portion 19 and the folded portion 18 can be simultaneously sewn at the sewing stage when the airbag 4 is first formed, the production efficiency of the airbag 4 is very good. In addition, since the sewing portion 24 extends over both upper and lower ends,
Even if the capacity of the inflator 12 is large and the material of the vehicle-body-side base cloth 15 and / or the occupant-side base cloth 16 of the airbag 4 is relatively weak, the forward load applied to the occupant-side base cloth 16 will not Can be reliably prevented from being torn.

A method of inserting the inflator 10 into the airbag 4 after the folded portion 18 is folded and both upper and lower end portions thereof are sewn, as shown in FIG. And a method of inserting the inflator 10 after turning over the opening 17 as shown in FIG. 10, either of which may be adopted. In any case, inflator 1
0 to the position of the storage portion 19, and in the case of FIG. Then, the attachment of the airbag 4 is completed.

According to this embodiment, the upper and lower ends of the storage portion 19 and the folded portion 18 of the airbag 4 are sewn.
Therefore, the rigidity of the upper and lower sewing portions 24 and the periphery thereof is improved. Therefore, even when the airbag 4 is deployed forward in the event of a side collision of the automobile and a forward load is applied to the vehicle body-side base cloth 15 and the occupant-side base cloth 16 that constitute the airbag 4, particularly, the occupant-side base cloth 16 is applied. A part of the forward load applied to the vehicle body-side base fabric 1 through the upper and lower sewing portions 24.
5, the mounting holes 20 of the occupant-side base cloth 16.
The load acting on the mounting hole 20 is reduced, and the mounting hole 20 can be prevented from being torn. Therefore, a troublesome structure for thickening the occupant side base cloth 16 and attaching a metal fitting for preventing tearing to the mounting hole 20 as in the related art is not required, and the simple structure as described above allows the occupant side cloth to be provided. It is possible to prevent the mounting hole 20 on the base cloth 16 from being torn.

Further, the vehicle body-side base cloth 15 and the occupant-side base cloth 16
The reinforcing cloths 21 and 22 are sewn to the mounting hole 20 and a bar-shaped reinforcing member 23 is provided behind the mounting hole 20 on the occupant-side base cloth 16 side of the storage portion 19. 20 is more reliably prevented from being torn.

FIGS. 11 and 12 show a second embodiment of the present invention. In the second embodiment, when the airbag 25 is formed first, the folded portion 18 and the storage portion 19 are not sewn at the same time.
Of the sewing portion 24,
Before sewing. Next, the folding part 18 is moved to the storage part 1.
The upper and lower ends are sewn to each other by another sewing part 26. By doing so, the state of the airbag 25 is stabilized by sewing the periphery of the airbag 25 with the continuous sewing portion 24 first, and then the folded portion 18 is folded back and sewn with another sewing portion 26. Can be easily performed. Therefore, the airbag 25 can be reliably manufactured even by a non-expert.

FIG. 13 is a diagram showing a third embodiment of the present invention. In the airbag 27 according to the third embodiment, the occupant-side base cloth 16 in the folded portion 18 is cut off, and the folded portion 1 is cut.
8 was formed only of the vehicle body side base cloth 15. Then, the folded portion 18 was folded, and both upper and lower end portions thereof were sewn to the storage portion 19 by the continuous sewing portion 24 as in the first embodiment. As described above, the folded portion 18 is attached to the vehicle body side fabric 15.
Even if it is formed only, the upper and lower ends of the folded portion 18 and the storage portion 19 are sewn to each other, so that the mounting hole 20 in the occupant-side base cloth 16 of the storage portion 19 is prevented from being torn. Then, by cutting off the occupant-side base cloth 16 at the turn-back portion 18, the opening of the airbag 27 is substantially widened,
The work of inserting the inflator into the airbag 27 becomes easier.

[0032]

According to the first aspect of the present invention, since the ends of the storage portion and the folded portion of the airbag are sewn to each other, the rigidity of the sewn portion and the periphery thereof is improved, and the forward load applied to the occupant-side base fabric is improved. Can be dispersed also on the vehicle body side fabric side through this sewn portion. Accordingly, the load acting on the mounting hole of the occupant-side base fabric is reduced, and the mounting hole is prevented from being torn. This eliminates the need for a complicated structure, such as the conventional technique, in which the occupant-side base cloth is thickened or a metal fitting for preventing tearing is mounted in the mounting hole, and the structure of the airbag itself and the mounting structure are simplified. Can be planned.

According to the second aspect of the present invention, even if the capacity of the inflator is large and the material of the base fabric of the airbag is relatively weak, the forward load applied to the occupant-side base fabric is not affected by the sewing portion. In addition, since the sewn portion extends over both upper and lower end portions, the tearing can be reliably prevented.

According to the third aspect of the present invention, when the periphery of the vehicle body-side fabric and the occupant-side fabric are sewn to form the airbag first, the ends of the storage portion and the folded portion are simultaneously sewn. Therefore, the production efficiency of the airbag is improved.

According to the fourth aspect of the present invention, the periphery of the vehicle body-side base cloth and the occupant-side base cloth are sewn to stabilize the state of the airbag once, and thereafter, the folded portion is turned back and sewn again. In addition, the airbag manufacturing operation is easy, and the airbag can be reliably manufactured even by a non-expert.

According to the fifth aspect of the present invention, since the mounting hole of the occupant-side base cloth is prevented from being torn, the base cloth at the turn-back portion can be made only by the vehicle-side base cloth. By using only the body-side base fabric as the folded portion, the opening of the airbag is substantially widened, and the work of inserting the inflator into the airbag becomes easy.

According to the sixth aspect of the present invention, since the reinforcing cloth is sewn on the mounting holes of the vehicle body-side base cloth and / or the occupant-side base cloth, tearing of the mounting holes is further prevented.

According to the seventh aspect of the present invention, since the rod-shaped reinforcing member is mounted on the rear side of the mounting hole, the mounting hole is more reliably prevented from being torn.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a side collision airbag device according to a first embodiment of the present invention.

FIG. 2 is a side view showing the airbag of FIG.

FIG. 3 shows a state before deployment of an airbag in FIG.
Sectional drawing along the SA line.

FIG. 4 is a view showing a state after the airbag is deployed.
Sectional drawing along the SA line.

FIG. 5 is a schematic sectional view showing a detailed structure of a storage portion and a folded portion of the airbag in FIG. 3;

FIG. 6 is a sectional view taken along the line SB-SB shown in FIG. 2;

FIG. 7 is a side view of the airbag showing a portion into which the bar-shaped reinforcing member of FIG. 5 is inserted.

FIG. 8 is a perspective view of the airbag showing a state in which upper and lower ends of the folded portion in FIG. 3 are being sewn to the storage portion.

FIG. 9 is a perspective view of the airbag showing a state after upper and lower ends of the folded portion of FIG.

FIG. 10 is a perspective view of the airbag showing a state in which the opening is turned up as a method of turning up the turn up in FIG. 3;

FIG. 11 is a perspective view showing a state in which the periphery of an airbag according to a second embodiment of the present invention is being sewn by a continuous sewing portion and is being folded back.

FIG. 12 is a perspective view showing a state where the folded portion of FIG. 11 is folded and sewn with another sewing portion.

FIG. 13 is a perspective view corresponding to FIG. 12 showing a folded portion of an airbag according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 seat back 4, 25, 27 airbag 10 inflator 13 stud bolt (projection) 14 frame 15 body side base cloth 16 occupant side base cloth 17 opening 18 folded back part 19 storage part 20 mounting hole 21, 22 reinforcing cloth 23 reinforcement Member 24 Sewing part 26 Another sewing part

Claims (7)

[Claims] 1. A bag-shaped airbag is formed by a body-side base cloth and an occupant-side base cloth, and an inflator for filling gas into the airbag is inserted from an opening at a rear end of the airbag and is positioned at a storage position. The folded back portion that is stored and rearward from the storage portion is folded back to the storage portion side, and the projection portion of the inflator is projected from each mounting hole formed in the occupant-side base fabric of the storage portion and the base fabric of the folded portion, and the projection portion is formed. Is fixed to a seat back, and a side collision airbag device for an automobile in which an airbag is inflated by an inflator gas and deployed forward at the time of a collision, wherein the storage portion and the folded portion of the airbag have end portions. Are sewn to each other. 2. The side airbag device for an automobile according to claim 1, wherein upper and lower ends of the sewn ends of the storage portion and the folded portion of the airbag are sewn to each other. An airbag device for a side collision of an automobile. 3. The airbag device for a side collision of an automobile according to claim 1, wherein the folded portion is folded back to a storage portion in advance, and the vehicle body-side fabric and the occupant-side fabric are folded. Characterized in that the peripheral edge of the airbag is sewn by a continuous sewing portion. 4. The side airbag device for an automobile according to claim 1 or 2, wherein a peripheral edge of the vehicle-body-side base cloth and the occupant-side base cloth before the turn-back part is turned back to the storage part side. Characterized in that the airbag device is sewn by a continuous sewing portion, and thereafter, the folded portion is folded back to the storage portion side, and its ends are sewn to each other by another sewing portion. . 5. The side airbag device for a vehicle according to claim 1, wherein the folded portion is provided only on the vehicle body-side base cloth. Side collision airbag device. 6. The side airbag device for an automobile according to claim 1, wherein a reinforcing cloth is provided in a mounting hole portion of the body-side base cloth and / or the occupant-side base cloth. An airbag device for a side collision of an automobile, which is sewn. 7. The side airbag device for an automobile according to claim 6, wherein a rod-shaped reinforcing member is attached to a rear side of the mounting hole by a reinforcing cloth. Side collision airbag device.