JP2001260791A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag for a front passenger seat which enables the reduction of the amount of gas needed for deploying the air bag. SOLUTION: The air bag for a front passenger seat is approximately in the form of a box which comprises a first ground fabric 2 and a second ground fabric 3 sewn to each other at their respective rear sides 2g and 3g forming a front part opposite to an occupant, and at their respective sides 2b and 3b extending from the front part in the advancing direction of the vehicle. The first ground fabric 2 and the second ground fabric 3 are formed of respective front sides 2a and 3a, a pair of respective sides 2b and 3b continuing with the front sides 2a and 3a and broadening toward the occupant; respective end sides 2d and 3d and respective front sides 2e and 3e which form valley-shaped notches; and respective rear sides 2g and 3g continuing with the front sides 2e and 3e. The apex of the valley-shaped notch of the second ground fabric 3 is located in front of the apex of the valley-shaped notch of the first ground fabric 2, whereby the amount of gas needed for deploying the air bag can be reduced and the use of a small inflator is made possible for economy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for protecting an occupant from an impact in the event of a car collision.

[0002]

2. Description of the Related Art Conventionally, as this type of airbag, for example, one described in Japanese Patent Application Laid-Open No. 8-268195 is known.

In the airbag disclosed in the above publication, a portion of the outer periphery of a pair of base fabrics having the same outer shape trapezoidal shape, except for the angle between the upper side and the bottom side and the vicinity thereof, is joined along the outer circumference. The contact surface is formed in a bag shape that is developed such that the hypotenuse is a side surface, and can be formed by superimposing on the hypotenuse and the base with the base angle as a base point, and bending the base fabric outward in the vertical direction. The surface is sewn into a shape that includes a convex curve with respect to the corners, so that a three-dimensional shape that is almost equivalent to an airbag made of three or more conventional base fabrics can be obtained. Since the flattening process can be performed in the bag process, there are effects such as easy automation.

[0004]

However, in the airbag disclosed in the above-mentioned publication, a pair of base cloths whose trapezoidal oblique sides have the same dimensions are sewn to form a bag-shaped airbag. As shown by the imaginary line in FIG. 3, the amount of protrusion of the upper base cloth and the lower base cloth to the occupant side is substantially the same,
As a result, the lower base cloth has a sufficient amount of protrusion to protect the occupant's chest, while the upper base cloth has an excessive protrusion amount, and as a result, has a sufficient protrusion amount to protect the occupant. However, there were problems such as an unnecessarily large volume.

The present invention has been made to solve such a conventional problem, and has an airbag in which an upper base fabric for protecting the head has a smaller protrusion than a lower base fabric for protecting the chest. The purpose is to provide.

[0006]

In order to achieve the above object, an airbag according to the present invention has a rear side forming a front portion facing an occupant, and a side extending from the front portion in the traveling direction of the vehicle. An approximately box-shaped airbag including two stitched first base cloths and a second base cloth, wherein the first base cloth and the second base cloth are connected to a front side and the front side, and A pair of side edges that are sequentially widened toward the occupant side, a side edge and a front side edge forming a valley-shaped notch, and a rear edge that is continuous with the front side edge. The top of the valley notch is
The valley-shaped notch of the first base cloth is located on the front side of the apex.

With the above structure, when the airbag is deployed at the time of a collision of the vehicle, the amount of gas required to deploy the airbag can be reduced because the amount of the upper second base cloth protruding toward the occupant is small. This makes it possible to use a small inflator, which is economical.

In order to achieve the above object, an airbag according to the present invention comprises a rear side forming a front side facing an occupant, and two side sides extending from the front side in the traveling direction of the vehicle, which are stitched together. A substantially box-shaped airbag comprising a first base fabric and a second base fabric, wherein the first base fabric and the second base fabric are connected to a front side and the front side, and are widened toward the occupant. A side edge, a side edge and a front side edge that form a valley-shaped notch, and a rear edge that is continuous with the front side, and the angle of the valley-shaped notch of the second base fabric is set. The angle of the valley-shaped cutout portion of the first base cloth is made smaller than the angle of the valley-shaped notch, and the amount of protrusion of the second base cloth, which is upper at the time of deployment, toward the occupant, is lower at the time of deployment. Is smaller than the amount of protrusion toward the occupant.

According to the above construction, the second base cloth projects toward the occupant only by making the angle of the valley cutout of the second base cloth narrower than the angle of the valley cutout of the first base cloth. An airbag having a small volume can be obtained easily and inexpensively, and the degree of freedom in shape selection can be increased by adjusting the angle of the valley-shaped notch of the second base fabric.

In order to achieve the above object, an airbag according to the present invention comprises a rear side forming a front portion facing an occupant, and a side extending from the front portion in the traveling direction of the vehicle, two pieces of which are stitched together. A substantially box-shaped airbag comprising a first base cloth and a second base cloth, wherein the first base cloth and the second base cloth are connected to the front side and the front side, and are sequentially widened toward the occupant. , A front side provided on one of the first base cloth or the second base cloth, a side end and a rear side continuous with the side, and the side end and the front The angle of the valley-shaped notch portion of the second base fabric formed by the side is smaller than the angle of the valley-shaped notch of the first base fabric formed by the side edge and the front side. The projecting amount of the second base cloth, which is upper at the time of deployment, toward the occupant is smaller than the projecting amount of the first base fabric, which is lower at the time of deployment, toward the occupant. One in which the.

According to the above construction, the second base cloth projects toward the occupant only by making the angle of the valley cutout of the second base cloth narrower than the angle of the valley cutout of the first base cloth. Since the amount can be reduced, the protrusion amount can be easily set by adjusting the angle of the valley-shaped notch portion of the second base cloth.

In order to achieve the above object, the airbag according to the present invention is such that the side edges and the front side edges of the first base fabric and the second base fabric are formed in an arc shape having substantially the same curvature.

With the above configuration, when the airbag is deployed, the corners protrude in an arc shape, so that stress is not locally concentrated.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings shown in FIGS.

FIG. 1 is an exploded view of two base fabrics before sewing.
FIG. 2 is a perspective view of the airbag in an inflated and deployed state, and FIG.
FIG.

As shown in FIG. 1, the airbag body 1 is formed by stitching two base cloths comprising a first base cloth 2 and a second base cloth 3 in a substantially box shape.

The first base cloth 2 and the second base cloth 3 are, for example, 31
It is formed by cutting a 5 denier, 66 nylon woven fabric having a basis weight of 200 g / m 2 as follows.

That is, the first base cloth 2 which is the lower side when deployed is such that the left and right sides 2b continuous with the front side 2a which is forward (F) with respect to the traveling direction of the vehicle are gradually widened to the rear (occupant side) R. The corner 2c where the front side 2a and the side 2b are connected has a small arc shape.

The rear end of the widened side 2b is continuous with the side 2d curved in an arc toward the center line O1 in the front-rear direction of the first base cloth 2, and the side 2b And side edge 2d
Are connected at a substantially right angle.

The end of each side edge 2d on the center line O1 side is a front side edge 2e formed in an arc shape having substantially the same curvature as the side edge 2d.
And the side lengths of the side edge 2d and the front side 2e are substantially the same, and a valley-shaped notch connecting the side 2d and the front side 2e has a front angle 2f. Has become.

The rear end of each front side 2e is continuous with the rear side 2g parallel to the front side 2a, and the side end 2d and the front side 2
e, the corner 2h where the side 2b and the side 2d are connected and the corner 2i where the side 2d and the rear 2g are connected to each other to form a front corner and the first base In the vicinity of the front side 2a of the cloth 2, a gas inlet 2j for introducing high-pressure gas generated from an inflator 4 described later into the airbag body 1.
Is open.

On the other hand, the front side 3a, the side 3b, and the corner 3c of the second base cloth 3, which is on the upper side when unfolded, have the same shape as the front side 2a, the side 2b, and the corner 2c of the first base cloth 2. The rear end side of the side 3b is continuous with the side end 3d curved in an arc shape toward the center line O2 in the front-rear direction of the second base fabric 3, and the airbag body. When the first base cloth 1 is unfolded, in order to reduce the amount of rearward protrusion of the upper second base cloth 3 with respect to the lower first base cloth 2, corner portions 3c where both side edges 3b and side end edges 3d are connected. Has an acute angle.

The end of each side edge 3d on the center line O2 side is a front side edge 3e formed in an arc shape having substantially the same curvature as the side edge 3d.
The side edge 3d and the front side 3e have substantially the same length, and a valley-shaped notch connecting the side edge 3d and the front side 3e is formed as a front corner 3f. Has become.

The rear end of each front side 3e is continuous with a rear side 3g parallel to the front side 3a.
When sewing e, the corner 3h where the both sides 3b and the side 3d are connected and the corner 3i where the side 3d and the side 3d are connected to the rear 3g are aligned with each other to form a front corner. Along with
Gas exhaust ports 3j are opened near both sides 3b.

The two sheets of the first base cloth 2 and the second
The base cloth 3 includes front sides 2a and 3a of the first base cloth 2 and the second base cloth 3,
The side edges 2b and 3b and the rear edges 2g and 3g are stitched together, and the side edge 2d of the first base fabric 2 and the front side edge 2e, and both end edges 3d of the second base fabric 3 and the front side edge 3e are stitched together. And Figure 2
And a gas inlet 2j opened in the first base cloth 2 during use.
Is folded while connected to the gas ejection port 4 a of the inflator 4, and stored in the airbag device 5.

Next, the operation of the airbag constructed as described above will be described. When the airbag is used for a passenger seat, an airbag device is provided in a dashboard 6 provided in front of a passenger seat (not shown). 5 is installed.

As a result, when an automobile collides and a strong impact exceeding a predetermined value is detected by a sensor system (not shown), the inflator 4 in the airbag device 5 generates high-pressure gas, and the airbag body 1 is moved to the position shown in FIG. Instantly expand and deploy as shown by the solid line.

At this time, the first base cloth 2 is placed on the lower side,
The base cloth 3 is deployed to the occupant side with the upper side, but the protrusion amount of the lower first base cloth 2 is larger than the upper protrusion amount and abuts on the occupant's chest to protect the occupant's chest from impact. I do.

The second base cloth 3 on the upper side is the first base cloth 3 on the lower side.
Since the corner 3f is formed at a narrow angle with respect to the corner 2f of the base cloth 2, the amount of protrusion that projects rearward is smaller than the amount of protrusion of the lower first base cloth 2 and the airbag Since the front portion of the main body 1 that protects the occupant protrudes in an arc shape toward the occupant, local concentration of stress can be prevented.

FIG. 4 shows another embodiment.
Next, this will be described. In this embodiment, the first base cloth is formed in a substantially trapezoidal shape, and the loose arc-shaped portions 2
k is formed, and the arc-shaped portion 2k is sewn to the front side 3k of the second base fabric 3.

The front side 3k of the second base cloth 3 is longer than that of the embodiment shown in FIG.
The arc-shaped portion 2k of the first base cloth 2 and the side edge 3 of the second base cloth 3
d is simultaneously sewn, and the other points are the same as those in the embodiment shown in FIG.

Also in this embodiment, the valley-shaped front corner 3f of the second base cloth 3 is connected to the arc-shaped portion 2k of the first base cloth 2 and the front side 3k of the second base cloth 3. When the airbag body 1 is deployed, the amount of protrusion of the upper second base cloth 3 toward the occupant side is reduced by the protrusion of the lower first base cloth 2 when the airbag body 1 is deployed. Can be smaller than the amount.

In any of the above embodiments, the angle of the valley-shaped corner 3f of the second base cloth 3 is changed as shown by the imaginary line in FIG. Can be set.

In the above embodiment, the airbag for the passenger seat has been described. However, the airbag for the rear seat can also be used.

[0035]

As described above in detail, according to the present invention, the projecting amount of the second base cloth, which is upper at the time of unfolding, toward the occupant is adjusted by the amount of protrusion of the first base cloth, which is lower at the time of unfolding, toward the occupant. Since the protrusion amount is smaller than the protrusion amount, when the airbag is deployed at the time of the collision of the car, the protrusion amount of the lower first base cloth toward the occupant is large.
The lower base cloth can reliably protect the occupant's chest, and the amount of protrusion of the upper second base cloth toward the occupant is smaller than the amount of protrusion of the lower first base cloth. It is economical because the amount of gas required to deploy can be reduced, which allows the use of smaller inflators.

The first base cloth and the second base cloth are connected to a front side, a side side continuous with the front side, and gradually widening toward the occupant, and a side end side forming a valley-shaped notch. And the front side,
Formed from the rear side continuous to the front side, the angle of the valley-shaped notch of the second base fabric is smaller than the angle of the valley-shaped notch of the first base fabric. Only by making the angle of the valley-shaped notch portion of the second base fabric narrower than the angle of the valley-shaped notch portion of the first base fabric, an airbag in which the amount of protrusion of the second base fabric to the occupant side is small and easy. The projection amount can be easily set by adjusting the angle of the valley-shaped notch portion of the second base cloth at a low cost.

Further, since the side edges and the front side of the first and second base fabrics are formed in the shape of an arc having substantially the same curvature, when the airbag is deployed, the front portion in contact with the occupant is circular. Since it protrudes in an arc shape, stress does not concentrate locally.

[Brief description of the drawings]

FIG. 1 is a development view of first and second base fabrics constituting an airbag according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the airbag according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of an airbag according to an embodiment of the present invention.

FIG. 4 is a developed view of first and second base fabrics constituting an airbag according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airbag main body 2 1st base fabric 2a Front side 2b Side 2c Corner 2d Side end 2e Front side 2f Front corner 2g Rear 2h Corner 2i Corner 2j Gas inlet 2k Arc-shaped part 3 Second Base cloth 3a Front side 3b Side 3c Corner 3d Side end 3e Front side 3f Front corner 3g Rear 3h Corner 3i Corner 3j Gas outlet 3k Front side 4 Inflator 4a Gas outlet 5 Airbag device 6 Dashboard

Claims (4)

[Claims] 1. A first base cloth and a second base cloth in which a rear side forming a front portion facing an occupant and side sides extending from the front portion in the traveling direction of the vehicle are stitched to each other. A substantially box-shaped airbag, comprising: a first base fabric and a second base fabric; a front side, a pair of side sides that are continuous with the front side, and are sequentially widened toward the occupant; It is formed from a side edge and a front side which form a notch, and a rear side continuous with the front side. An airbag, wherein the airbag is located forward of a top of the notch. 2. A first base cloth and a second base cloth in which a rear side forming a front part facing an occupant and side sides extending from the front part in the traveling direction of the vehicle are stitched to each other. A substantially box-shaped airbag, wherein the first base fabric and the second base fabric are provided with a front side, a side side continuous with the front side, and gradually widening toward an occupant; And the angle of the valley-shaped notch of the second base cloth is set to the valley-shaped cut of the first base cloth. By making the angle smaller than the angle of the notch, the amount of protrusion of the second base cloth, which is upper at the time of deployment, to the occupant side is smaller than the amount of protrusion of the first base cloth, which is lower at the time of deployment, to the occupant side. An airbag, characterized in that: 3. A first base cloth and a second base cloth in which a rear side forming a front portion facing an occupant and side edges extending from the front portion in the traveling direction of the vehicle are stitched to each other. A substantially box-shaped airbag, wherein the first base cloth and the second base cloth are connected to a front side and a side side that is continuous with the front side and that is gradually widened toward an occupant; A front side provided on one side of the second base cloth, a side end and a rear side continuous with the side, and the second base cloth formed by the side end and the front side. The angle of the valley-shaped notch is smaller than the angle of the valley-shaped notch of the first base cloth formed by the side edge and the front side, and the second base cloth that is on the upper side when unfolded. An airbag characterized in that the amount of protrusion of the first base cloth, which is a lower side when deployed, toward the occupant is smaller than the amount of protrusion of the first base cloth when deployed. 4. The air according to claim 1, wherein a side edge and a front side of the first base fabric and the second base fabric are formed in an arc shape having substantially the same curvature. bag.