JP2001163141A - Air bag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase projecting amount of a bag body in an inexpensive structure. SOLUTION: The air bag device for a vehicle comprises the bag body 15 capable of swelling to the occupant side 16 in a cabin. The bag body 15 has a two-piece structure in which two base clothes 21, 22 with a substantially same shape are overlapped and their peripheral edges are sewed with each other, and a pair of vertical sewing parts 25 extending substantially in back and forth direction of the vehicle are provided for both sides of at least one of the base clothes 21, 22.

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 vehicle which can increase the amount of protrusion of a bag body with an inexpensive structure.

[0002]

2. Description of the Related Art Some vehicles such as automobiles have an airbag device as an emergency safety means. In the airbag device, when an impact force of a predetermined value or more is applied to a vehicle body, a bag body folded and stored in a housing disposed inside an instrument panel or the like,
It swells toward the occupant side of the cabin due to the pressure of the pressurized gas from the inflator, and receives the head of the occupant sitting in a fixed position to protect the head from touching the instrument panel etc. is there.

[0003] Among such airbag devices, an airbag device for a passenger seat is usually used together with a seat belt. However, in recent years, an airbag device that can safely protect an occupant even when the seat belt is not worn has been studied.

In this type of airbag device, it is necessary to increase the amount of protrusion of the instrument panel from the end on the occupant side toward the rear in the vehicle longitudinal direction. To this end, it is conceivable to increase the capacity of the bag body to secure the above-mentioned protrusion amount. In an airbag device for a passenger seat, usually, the bag body is formed by stacking two base cloths 1 and 2 having substantially the same shape as shown in FIG. 9 and sewing the periphery thereof (sewing line 3). , A so-called two-piece configuration. However, in order to increase the capacity of the bag body, as shown in FIG.
It is considered advantageous to form a so-called three-piece structure comprising three cloths, namely, a band-like base cloth 5 interposed between the peripheral edges of the side cloths 4 and 4 and sewn.

In FIGS. 9 and 10, reference numeral 6 denotes a pressure gas inlet of the bag body, and reference numeral 7 denotes a vent hole for adjusting the internal pressure of the bag body.

[0006]

However, when the bag body is formed into three pieces, it is easy to secure a protruding amount from the end of the instrument panel on the occupant side toward the rear in the vehicle front-rear direction. And the cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an airbag device for a vehicle which can solve the above-mentioned problems and can increase the amount of protrusion of the bag body with an inexpensive structure.

[0008]

According to a first aspect of the present invention, there is provided an airbag apparatus for a vehicle having a bag body which can be inflated toward an occupant in a vehicle. The main body has a two-piece configuration in which two base cloths having substantially the same shape are overlapped and the peripheral edges are sewn together, and a pair of vertical stitches extending in a substantially vertical direction on at least one side of the base cloth. It is characterized by having been subjected to a part.

According to the first aspect of the present invention, at least one of the base fabrics is provided with a pair of vertical sewing portions extending substantially in the vertical direction on both sides thereof.
When the bag body is inflated, the force concentrates on the vertical sewing part and the vertical sewing part breaks, so that the lateral expansion of the bag body is suppressed and the amount of the bag body protruding rearward in the vehicle longitudinal direction. Can be increased.

Further, since the above-mentioned effects can be achieved with a two-piece bag body using a small amount of base cloth and without increasing the capacity of the bag body, the size of the airbag device for a vehicle can be reduced. It becomes possible.

The invention according to claim 2 is characterized in that a horizontal sewing portion extending substantially in the vehicle width direction is provided between the vertical sewing portions.

[0012] According to the second aspect of the present invention, since the horizontal sewing portion extending substantially in the horizontal direction is provided between the vertical sewing portions, the horizontal sewing portion can also be folded. The position where the amount of protrusion of the bag body rearward in the vehicle front-rear direction can be freely set by the formation position of the side sewing portion.

In the invention described in claim 3, the vertical sewing portion and the horizontal sewing portion are formed by knob sewing.

According to the third aspect of the present invention, the vertical stitching portion and the horizontal stitching portion are made to function as folds by making the vertical stitching portion and the horizontal stitching portion have a pinch stitch. It becomes possible.

[0015]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 7 show a first embodiment of the present invention.

First, the structure will be described. As shown in FIG. 1, the airbag device 11 includes an instrument panel 1
An inflator 14 that is provided in a housing 13 housed inside the housing 2 and that blows out pressurized gas when the vehicle receives an impact force of a predetermined value or more, and an inflator 14 that is housed in the housing 13 in a folded state in a normal state. And a bag body 15 that expands when a pressurized gas is jetted from the bag body. When the pressurized gas is ejected from the inflator 14, the bag body 15 (15a in FIG. 1) is moved from the upper part of the instrument panel 12 to the passenger side 1 in the vehicle interior.
6 to swell. In addition, in FIG.
Reference numeral 7 denotes a front window glass of the vehicle, and reference numeral 18 denotes a vent hole for adjusting the internal pressure of the bag body 15a.

In the first embodiment, as shown in FIGS. 2A to 2C, the bag main body 15 is formed by superposing two base cloths 21 and 22 having substantially the same shape on a peripheral portion. The two pieces are sewn together (sewing line 23), and the sewing line 23 is turned upside down so that the sewing line 23 is hidden inside after sewing. In FIG. 2, reference numeral 24 denotes a pressure gas inlet formed in one of the base cloths 21, and the bag body 15 is turned upside down through the pressure gas inlet 24.

A pair of vertical sewing portions 25 extending substantially in the vertical direction (vehicle front-rear direction) are provided on both sides of at least one of the base fabrics 21 and 22 (both in FIG. 2). . The vertical sewing portion 25 has a substantially free curved shape that curves toward the center of the bag body 15 with the corresponding front and rear corners of the bag body 15 as a start point and an end point.

As shown in FIG. 3, the vertical sewing portion 25 is formed by pinching the base cloths 21 and 22 toward the front side of the bag body 15 and sewing the pinched portion, that is, so-called knob sewing. I am trying to.

Next, the operation of the first embodiment will be described.

When the pressurized gas is blown from the inflator 14, the bag body 15 (15a in FIG. 1) swells from the upper part of the instrument panel 12 to the passenger side 16 in the vehicle interior, and the bag body 15 Take the head. In this manner, the bag body 15a swells toward the front of the occupant, so that the head or the like can be prevented from directly colliding with the instrument panel 12 or the like, and the occupant can be protected.

Then, at least one of the base cloths 21,
A pair of vertical sewing portions 25 extending substantially in the vertical direction (vehicle front-rear direction) is provided on both sides of the bag body 22, so that the bag body 1 is formed.
4 (a) to 4 (c), especially FIG.
As shown in the figure, the force is concentrated on the vertical sewing section 25 and the vertical sewing section 2
Since the fold 5 is a fold, the lateral expansion of the bag body 15 is suppressed, and accordingly, the amount of protrusion of the bag body 15 rearward in the vehicle front-rear direction can be increased. More specifically, a four-piece bag body 2 composed of two base cloths 26, 26 and two side cloths 27, 27 as shown in FIG.
8, it is possible to obtain almost the same function as that of FIG.
(A) to (c), the dimension in the horizontal direction is smaller than that of the conventional one in which the vertical sewing portion 25 is not provided.
C) The bulge becomes large (b> d).

As a result, in the conventional machine without the vertical sewing portion 25, as shown by the imaginary line 15b in FIG. By providing the bag body 15, as shown by the solid line 15 a in FIG. 1, the amount of protrusion of the bag body 15 a toward the rear in the vehicle longitudinal direction is increased.

Moreover, the amount of protrusion of the bag body 15 rearward in the vehicle front-rear direction becomes large in the vicinity of the apex of the vertical curved portion 25 having a free curved shape. It is possible to arbitrarily set the portion where the occupant abuts on the main body 15 and improve the protection ability for the portion where the occupant abuts.

In particular, by setting the position where the occupant abuts at a position corresponding to the occupant's chest, the occupant's chest can be quickly and safely restrained by the bag body 15 even when the seat belt is not worn. Becomes As a result, FIG.
As shown in (a), the occupant's chest is restrained and then
As shown in (b), the operation can be performed so as to restrain the occupant's head, and the occupant can be reliably protected.

Further, since the above-mentioned effect can be achieved with the two-piece bag body 15 in which the amount of the base cloths 21 and 22 used is small and the capacity of the bag body 15 is hardly increased, the airbag device for a vehicle is provided. It is possible to reduce the size.

Further, by making the vertical sewing portion 25 be a knob stitch, the vertical sewing portion 25 can reliably function as a fold.

[0029]

Second Embodiment FIG. 8 shows a second embodiment of the present invention. Note that the same or equivalent parts as those in the first embodiment are described with the same reference numerals.

In the second embodiment, between the vertical sewing portions 25, a horizontal sewing portion 31 extending substantially in the horizontal direction (vehicle width direction) is provided.

The side sewing portion 31 is formed by pinching the base cloths 21 and 22 toward the front surface of the bag body 15 and sewing the pinched portion, that is, so-called knob sewing.

As described above, since the transverse sewing portion 31 extending substantially in the horizontal direction (vehicle width direction) is provided between the vertical sewing portions 25, the transverse sewing portion 31 can also be creased. The position at which the amount of protrusion of the bag body toward the rear in the vehicle front-rear direction can be freely set depending on the formation position of the bag body.

Further, by making the horizontal sewing portion 31 be a knob sewing, the vertical sewing portion 25 and the horizontal sewing portion 31 can reliably function as a fold.

The other parts have the same structure as in the first embodiment, and the same operation and effect can be obtained.

[0035]

As described above, according to the first aspect of the present invention, at least one of the base fabrics is provided with a pair of vertical sewing portions extending substantially in the vertical direction on both sides thereof.
When the bag body is inflated, the force concentrates on the vertical sewing part and the vertical sewing part breaks, so that the lateral expansion of the bag body is suppressed and the amount of the bag body protruding rearward in the vehicle longitudinal direction. Can be increased.

Further, since the above-mentioned effects can be achieved with a two-piece bag body using a small amount of base cloth and without increasing the capacity of the bag body, the size of the vehicle airbag device can be reduced. It becomes possible.

According to the second aspect of the present invention, between the vertical sewing portions,
By applying the horizontal seam that extends almost in the horizontal direction, the horizontal seam can also be broken.Therefore, the position where the amount of protrusion of the bag body to the rear in the vehicle longitudinal direction can be freely set by the position of the horizontal seam is formed. can do.

According to the third aspect of the present invention, the vertical stitching portion and the horizontal stitching portion are formed by knob-stitching, so that the vertical stitching portion and the horizontal stitching portion can reliably function as folds. It can exert a beneficial effect.

[Brief description of the drawings]

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

2A is a plan view of the bag body of FIG. 1, FIG. 2B is a vertical side view, and FIG. 2C is a horizontal side view.

FIG. 3 is a diagram showing a state of a knob sewing.

FIG. 4 (a) is a plan view of the bag body of FIG. 1 when inflated,
(B) is a vertical side view, and (c) is a horizontal side view.

FIG. 5 is an exploded view of a four-piece bag body equivalent to FIG. 2;

6A is a plan view of a conventional bag body without a vertical sewing portion when inflated, FIG. 6B is a vertical side view, and FIG. 6C is a horizontal side view.

FIGS. 7A and 7B are side views showing a process of unfolding the bag body.

FIG. 8 is a plan view of the bag body according to the first embodiment of the present invention.

FIG. 9 is an exploded perspective view of the two-piece bag.

FIG. 10 is a perspective view of a three-piece bag.

[Explanation of symbols]

 15 Bag body 16 Cabin side 21 Base cloth 22 Base cloth 23 Sewing line 25 Vertical sewing part 31 Horizontal sewing part

Claims (3)

[Claims] 1. An airbag device for a vehicle having a bag body which can be inflated toward the occupant side of a vehicle compartment, wherein the bag body is formed by superimposing two base cloths having substantially the same shape and sewing the peripheral edges thereof. An airbag device for a vehicle, comprising a pair of vertical sewing portions extending in a substantially vertical direction on both sides of at least one of the base fabrics. 2. The airbag device for a vehicle according to claim 1, wherein a horizontal sewing portion extending substantially in a horizontal direction is provided between the vertical sewing portions. 3. The airbag device for a vehicle according to claim 1, wherein the vertical sewing portion and the horizontal sewing portion are formed by knob sewing.